scsi: ufs: Split the drivers/scsi/ufs directory

Split the drivers/scsi/ufs directory into 'core' and 'host' directories
under the drivers/ufs/ directory. Move shared header files into the
include/ufs/ directory. This separation makes it clear which header files
UFS drivers are allowed to include (include/ufs/*.h) and which header files
UFS drivers are not allowed to include (drivers/ufs/core/*.h).

Update the MAINTAINERS file. Add myself as a UFS reviewer.

Link: https://lore.kernel.org/r/20220511212552.655341-1-bvanassche@acm.org
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Bean Huo <beanhuo@micron.com>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Keoseong Park <keosung.park@samsung.com>
Tested-by: Bean Huo <beanhuo@micron.com>
Tested-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

17 files changed, 15719 insertions, 0 deletions

diff --git a/drivers/ufs/core/Kconfig b/drivers/ufs/core/Kconfig
new file mode 100644
index 000000000000..e11978171403
--- /dev/null
+++ b/drivers/ufs/core/Kconfig
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Kernel configuration file for the UFS Host Controller core.
+#
+# Copyright (C) 2011-2013 Samsung India Software Operations
+#
+# Authors:
+#	Santosh Yaraganavi <santosh.sy@samsung.com>
+#	Vinayak Holikatti <h.vinayak@samsung.com>
+
+config SCSI_UFS_BSG
+	bool "Universal Flash Storage BSG device node"
+	select BLK_DEV_BSGLIB
+	help
+	  Universal Flash Storage (UFS) is SCSI transport specification for
+	  accessing flash storage on digital cameras, mobile phones and
+	  consumer electronic devices.
+	  A UFS controller communicates with a UFS device by exchanging
+	  UFS Protocol Information Units (UPIUs).
+	  UPIUs can not only be used as a transport layer for the SCSI protocol
+	  but are also used by the UFS native command set.
+	  This transport driver supports exchanging UFS protocol information units
+	  with a UFS device. See also the ufshcd driver, which is a SCSI driver
+	  that supports UFS devices.
+
+	  Select this if you need a bsg device node for your UFS controller.
+	  If unsure, say N.
+
+config SCSI_UFS_CRYPTO
+	bool "UFS Crypto Engine Support"
+	depends on BLK_INLINE_ENCRYPTION
+	help
+	  Enable Crypto Engine Support in UFS.
+	  Enabling this makes it possible for the kernel to use the crypto
+	  capabilities of the UFS device (if present) to perform crypto
+	  operations on data being transferred to/from the device.
+
+config SCSI_UFS_HPB
+	bool "Support UFS Host Performance Booster"
+	help
+	  The UFS HPB feature improves random read performance. It caches
+	  L2P (logical to physical) map of UFS to host DRAM. The driver uses HPB
+	  read command by piggybacking physical page number for bypassing FTL (flash
+	  translation layer)'s L2P address translation.
+
+config SCSI_UFS_FAULT_INJECTION
+	bool "UFS Fault Injection Support"
+	depends on FAULT_INJECTION
+	help
+	  Enable fault injection support in the UFS driver. This makes it easier
+	  to test the UFS error handler and abort handler.
+
+config SCSI_UFS_HWMON
+	bool "UFS Temperature Notification"
+	depends on SCSI_UFSHCD=HWMON || HWMON=y
+	help
+	  This provides support for UFS hardware monitoring. If enabled,
+	  a hardware monitoring device will be created for the UFS device.
+
+	  If unsure, say N.
diff --git a/drivers/ufs/core/Makefile b/drivers/ufs/core/Makefile
new file mode 100644
index 000000000000..62f38c5bf857
--- /dev/null
+++ b/drivers/ufs/core/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SCSI_UFSHCD)		+= ufshcd-core.o
+ufshcd-core-y				+= ufshcd.o ufs-sysfs.o
+ufshcd-core-$(CONFIG_DEBUG_FS)		+= ufs-debugfs.o
+ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o
+ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO)	+= ufshcd-crypto.o
+ufshcd-core-$(CONFIG_SCSI_UFS_HPB)	+= ufshpb.o
+ufshcd-core-$(CONFIG_SCSI_UFS_FAULT_INJECTION) += ufs-fault-injection.o
+ufshcd-core-$(CONFIG_SCSI_UFS_HWMON)	+= ufs-hwmon.o
diff --git a/drivers/ufs/core/ufs-debugfs.c b/drivers/ufs/core/ufs-debugfs.c
new file mode 100644
index 000000000000..e3baed6c70bd
--- /dev/null
+++ b/drivers/ufs/core/ufs-debugfs.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 Intel Corporation
+
+#include <linux/debugfs.h>
+
+#include "ufs-debugfs.h"
+#include <ufs/ufshcd.h>
+#include "ufshcd-priv.h"
+
+static struct dentry *ufs_debugfs_root;
+
+struct ufs_debugfs_attr {
+	const char			*name;
+	mode_t				mode;
+	const struct file_operations	*fops;
+};
+
+/* @file corresponds to a debugfs attribute in directory hba->debugfs_root. */
+static inline struct ufs_hba *hba_from_file(const struct file *file)
+{
+	return d_inode(file->f_path.dentry->d_parent)->i_private;
+}
+
+void __init ufs_debugfs_init(void)
+{
+	ufs_debugfs_root = debugfs_create_dir("ufshcd", NULL);
+}
+
+void ufs_debugfs_exit(void)
+{
+	debugfs_remove_recursive(ufs_debugfs_root);
+}
+
+static int ufs_debugfs_stats_show(struct seq_file *s, void *data)
+{
+	struct ufs_hba *hba = hba_from_file(s->file);
+	struct ufs_event_hist *e = hba->ufs_stats.event;
+
+#define PRT(fmt, typ) \
+	seq_printf(s, fmt, e[UFS_EVT_ ## typ].cnt)
+
+	PRT("PHY Adapter Layer errors (except LINERESET): %llu\n", PA_ERR);
+	PRT("Data Link Layer errors: %llu\n", DL_ERR);
+	PRT("Network Layer errors: %llu\n", NL_ERR);
+	PRT("Transport Layer errors: %llu\n", TL_ERR);
+	PRT("Generic DME errors: %llu\n", DME_ERR);
+	PRT("Auto-hibernate errors: %llu\n", AUTO_HIBERN8_ERR);
+	PRT("IS Fatal errors (CEFES, SBFES, HCFES, DFES): %llu\n", FATAL_ERR);
+	PRT("DME Link Startup errors: %llu\n", LINK_STARTUP_FAIL);
+	PRT("PM Resume errors: %llu\n", RESUME_ERR);
+	PRT("PM Suspend errors : %llu\n", SUSPEND_ERR);
+	PRT("Logical Unit Resets: %llu\n", DEV_RESET);
+	PRT("Host Resets: %llu\n", HOST_RESET);
+	PRT("SCSI command aborts: %llu\n", ABORT);
+#undef PRT
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(ufs_debugfs_stats);
+
+static int ee_usr_mask_get(void *data, u64 *val)
+{
+	struct ufs_hba *hba = data;
+
+	*val = hba->ee_usr_mask;
+	return 0;
+}
+
+static int ufs_debugfs_get_user_access(struct ufs_hba *hba)
+__acquires(&hba->host_sem)
+{
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		up(&hba->host_sem);
+		return -EBUSY;
+	}
+	ufshcd_rpm_get_sync(hba);
+	return 0;
+}
+
+static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
+__releases(&hba->host_sem)
+{
+	ufshcd_rpm_put_sync(hba);
+	up(&hba->host_sem);
+}
+
+static int ee_usr_mask_set(void *data, u64 val)
+{
+	struct ufs_hba *hba = data;
+	int err;
+
+	if (val & ~(u64)MASK_EE_STATUS)
+		return -EINVAL;
+	err = ufs_debugfs_get_user_access(hba);
+	if (err)
+		return err;
+	err = ufshcd_update_ee_usr_mask(hba, val, MASK_EE_STATUS);
+	ufs_debugfs_put_user_access(hba);
+	return err;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(ee_usr_mask_fops, ee_usr_mask_get, ee_usr_mask_set, "%#llx\n");
+
+void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status)
+{
+	bool chgd = false;
+	u16 ee_ctrl_mask;
+	int err = 0;
+
+	if (!hba->debugfs_ee_rate_limit_ms || !status)
+		return;
+
+	mutex_lock(&hba->ee_ctrl_mutex);
+	ee_ctrl_mask = hba->ee_drv_mask | (hba->ee_usr_mask & ~status);
+	chgd = ee_ctrl_mask != hba->ee_ctrl_mask;
+	if (chgd) {
+		err = __ufshcd_write_ee_control(hba, ee_ctrl_mask);
+		if (err)
+			dev_err(hba->dev, "%s: failed to write ee control %d\n",
+				__func__, err);
+	}
+	mutex_unlock(&hba->ee_ctrl_mutex);
+
+	if (chgd && !err) {
+		unsigned long delay = msecs_to_jiffies(hba->debugfs_ee_rate_limit_ms);
+
+		queue_delayed_work(system_freezable_wq, &hba->debugfs_ee_work, delay);
+	}
+}
+
+static void ufs_debugfs_restart_ee(struct work_struct *work)
+{
+	struct ufs_hba *hba = container_of(work, struct ufs_hba, debugfs_ee_work.work);
+
+	if (!hba->ee_usr_mask || pm_runtime_suspended(hba->dev) ||
+	    ufs_debugfs_get_user_access(hba))
+		return;
+	ufshcd_write_ee_control(hba);
+	ufs_debugfs_put_user_access(hba);
+}
+
+static int ufs_saved_err_show(struct seq_file *s, void *data)
+{
+	struct ufs_debugfs_attr *attr = s->private;
+	struct ufs_hba *hba = hba_from_file(s->file);
+	const int *p;
+
+	if (strcmp(attr->name, "saved_err") == 0) {
+		p = &hba->saved_err;
+	} else if (strcmp(attr->name, "saved_uic_err") == 0) {
+		p = &hba->saved_uic_err;
+	} else {
+		return -ENOENT;
+	}
+
+	seq_printf(s, "%d\n", *p);
+	return 0;
+}
+
+static ssize_t ufs_saved_err_write(struct file *file, const char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	struct ufs_debugfs_attr *attr = file->f_inode->i_private;
+	struct ufs_hba *hba = hba_from_file(file);
+	char val_str[16] = { };
+	int val, ret;
+
+	if (count > sizeof(val_str))
+		return -EINVAL;
+	if (copy_from_user(val_str, buf, count))
+		return -EFAULT;
+	ret = kstrtoint(val_str, 0, &val);
+	if (ret < 0)
+		return ret;
+
+	spin_lock_irq(hba->host->host_lock);
+	if (strcmp(attr->name, "saved_err") == 0) {
+		hba->saved_err = val;
+	} else if (strcmp(attr->name, "saved_uic_err") == 0) {
+		hba->saved_uic_err = val;
+	} else {
+		ret = -ENOENT;
+	}
+	if (ret == 0)
+		ufshcd_schedule_eh_work(hba);
+	spin_unlock_irq(hba->host->host_lock);
+
+	return ret < 0 ? ret : count;
+}
+
+static int ufs_saved_err_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ufs_saved_err_show, inode->i_private);
+}
+
+static const struct file_operations ufs_saved_err_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ufs_saved_err_open,
+	.read		= seq_read,
+	.write		= ufs_saved_err_write,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct ufs_debugfs_attr ufs_attrs[] = {
+	{ "stats", 0400, &ufs_debugfs_stats_fops },
+	{ "saved_err", 0600, &ufs_saved_err_fops },
+	{ "saved_uic_err", 0600, &ufs_saved_err_fops },
+	{ }
+};
+
+void ufs_debugfs_hba_init(struct ufs_hba *hba)
+{
+	const struct ufs_debugfs_attr *attr;
+	struct dentry *root;
+
+	/* Set default exception event rate limit period to 20ms */
+	hba->debugfs_ee_rate_limit_ms = 20;
+	INIT_DELAYED_WORK(&hba->debugfs_ee_work, ufs_debugfs_restart_ee);
+
+	root = debugfs_create_dir(dev_name(hba->dev), ufs_debugfs_root);
+	if (IS_ERR_OR_NULL(root))
+		return;
+	hba->debugfs_root = root;
+	d_inode(root)->i_private = hba;
+	for (attr = ufs_attrs; attr->name; attr++)
+		debugfs_create_file(attr->name, attr->mode, root, (void *)attr,
+				    attr->fops);
+	debugfs_create_file("exception_event_mask", 0600, hba->debugfs_root,
+			    hba, &ee_usr_mask_fops);
+	debugfs_create_u32("exception_event_rate_limit_ms", 0600, hba->debugfs_root,
+			   &hba->debugfs_ee_rate_limit_ms);
+}
+
+void ufs_debugfs_hba_exit(struct ufs_hba *hba)
+{
+	debugfs_remove_recursive(hba->debugfs_root);
+	cancel_delayed_work_sync(&hba->debugfs_ee_work);
+}
diff --git a/drivers/ufs/core/ufs-debugfs.h b/drivers/ufs/core/ufs-debugfs.h
new file mode 100644
index 000000000000..97548a3f90eb
--- /dev/null
+++ b/drivers/ufs/core/ufs-debugfs.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020 Intel Corporation
+ */
+
+#ifndef __UFS_DEBUGFS_H__
+#define __UFS_DEBUGFS_H__
+
+struct ufs_hba;
+
+#ifdef CONFIG_DEBUG_FS
+void __init ufs_debugfs_init(void);
+void ufs_debugfs_exit(void);
+void ufs_debugfs_hba_init(struct ufs_hba *hba);
+void ufs_debugfs_hba_exit(struct ufs_hba *hba);
+void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status);
+#else
+static inline void ufs_debugfs_init(void) {}
+static inline void ufs_debugfs_exit(void) {}
+static inline void ufs_debugfs_hba_init(struct ufs_hba *hba) {}
+static inline void ufs_debugfs_hba_exit(struct ufs_hba *hba) {}
+static inline void ufs_debugfs_exception_event(struct ufs_hba *hba, u16 status) {}
+#endif
+
+#endif
diff --git a/drivers/ufs/core/ufs-fault-injection.c b/drivers/ufs/core/ufs-fault-injection.c
new file mode 100644
index 000000000000..7ac7c4e7ff83
--- /dev/null
+++ b/drivers/ufs/core/ufs-fault-injection.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kconfig.h>
+#include <linux/types.h>
+#include <linux/fault-inject.h>
+#include <linux/module.h>
+#include "ufs-fault-injection.h"
+
+static int ufs_fault_get(char *buffer, const struct kernel_param *kp);
+static int ufs_fault_set(const char *val, const struct kernel_param *kp);
+
+static const struct kernel_param_ops ufs_fault_ops = {
+	.get = ufs_fault_get,
+	.set = ufs_fault_set,
+};
+
+enum { FAULT_INJ_STR_SIZE = 80 };
+
+/*
+ * For more details about fault injection, please refer to
+ * Documentation/fault-injection/fault-injection.rst.
+ */
+static char g_trigger_eh_str[FAULT_INJ_STR_SIZE];
+module_param_cb(trigger_eh, &ufs_fault_ops, g_trigger_eh_str, 0644);
+MODULE_PARM_DESC(trigger_eh,
+	"Fault injection. trigger_eh=<interval>,<probability>,<space>,<times>");
+static DECLARE_FAULT_ATTR(ufs_trigger_eh_attr);
+
+static char g_timeout_str[FAULT_INJ_STR_SIZE];
+module_param_cb(timeout, &ufs_fault_ops, g_timeout_str, 0644);
+MODULE_PARM_DESC(timeout,
+	"Fault injection. timeout=<interval>,<probability>,<space>,<times>");
+static DECLARE_FAULT_ATTR(ufs_timeout_attr);
+
+static int ufs_fault_get(char *buffer, const struct kernel_param *kp)
+{
+	const char *fault_str = kp->arg;
+
+	return sysfs_emit(buffer, "%s\n", fault_str);
+}
+
+static int ufs_fault_set(const char *val, const struct kernel_param *kp)
+{
+	struct fault_attr *attr = NULL;
+
+	if (kp->arg == g_trigger_eh_str)
+		attr = &ufs_trigger_eh_attr;
+	else if (kp->arg == g_timeout_str)
+		attr = &ufs_timeout_attr;
+
+	if (WARN_ON_ONCE(!attr))
+		return -EINVAL;
+
+	if (!setup_fault_attr(attr, (char *)val))
+		return -EINVAL;
+
+	strlcpy(kp->arg, val, FAULT_INJ_STR_SIZE);
+
+	return 0;
+}
+
+bool ufs_trigger_eh(void)
+{
+	return should_fail(&ufs_trigger_eh_attr, 1);
+}
+
+bool ufs_fail_completion(void)
+{
+	return should_fail(&ufs_timeout_attr, 1);
+}
diff --git a/drivers/ufs/core/ufs-fault-injection.h b/drivers/ufs/core/ufs-fault-injection.h
new file mode 100644
index 000000000000..6d0cd8e10c87
--- /dev/null
+++ b/drivers/ufs/core/ufs-fault-injection.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _UFS_FAULT_INJECTION_H
+#define _UFS_FAULT_INJECTION_H
+
+#include <linux/kconfig.h>
+#include <linux/types.h>
+
+#ifdef CONFIG_SCSI_UFS_FAULT_INJECTION
+bool ufs_trigger_eh(void);
+bool ufs_fail_completion(void);
+#else
+static inline bool ufs_trigger_eh(void)
+{
+	return false;
+}
+
+static inline bool ufs_fail_completion(void)
+{
+	return false;
+}
+#endif
+
+#endif /* _UFS_FAULT_INJECTION_H */
diff --git a/drivers/ufs/core/ufs-hwmon.c b/drivers/ufs/core/ufs-hwmon.c
new file mode 100644
index 000000000000..4c6a872b7a7c
--- /dev/null
+++ b/drivers/ufs/core/ufs-hwmon.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * UFS hardware monitoring support
+ * Copyright (c) 2021, Western Digital Corporation
+ */
+
+#include <linux/hwmon.h>
+#include <linux/units.h>
+
+#include <ufs/ufshcd.h>
+#include "ufshcd-priv.h"
+
+struct ufs_hwmon_data {
+	struct ufs_hba *hba;
+	u8 mask;
+};
+
+static int ufs_read_temp_enable(struct ufs_hba *hba, u8 mask, long *val)
+{
+	u32 ee_mask;
+	int err;
+
+	err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
+				&ee_mask);
+	if (err)
+		return err;
+
+	*val = (mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) || (mask & ee_mask & MASK_EE_TOO_LOW_TEMP);
+
+	return 0;
+}
+
+static int ufs_get_temp(struct ufs_hba *hba, enum attr_idn idn, long *val)
+{
+	u32 value;
+	int err;
+
+	err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0, 0, &value);
+	if (err)
+		return err;
+
+	if (value == 0)
+		return -ENODATA;
+
+	*val = ((long)value - 80) * MILLIDEGREE_PER_DEGREE;
+
+	return 0;
+}
+
+static int ufs_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			  long *val)
+{
+	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
+	struct ufs_hba *hba = data->hba;
+	int err;
+
+	down(&hba->host_sem);
+
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		up(&hba->host_sem);
+		return -EBUSY;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+
+	switch (attr) {
+	case hwmon_temp_enable:
+		err = ufs_read_temp_enable(hba, data->mask, val);
+
+		break;
+	case hwmon_temp_crit:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_HIGH_TEMP_BOUND, val);
+
+		break;
+	case hwmon_temp_lcrit:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_LOW_TEMP_BOUND, val);
+
+		break;
+	case hwmon_temp_input:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_CASE_ROUGH_TEMP, val);
+
+		break;
+	default:
+		err = -EOPNOTSUPP;
+
+		break;
+	}
+
+	ufshcd_rpm_put_sync(hba);
+
+	up(&hba->host_sem);
+
+	return err;
+}
+
+static int ufs_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			   long val)
+{
+	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
+	struct ufs_hba *hba = data->hba;
+	int err;
+
+	if (attr != hwmon_temp_enable)
+		return -EINVAL;
+
+	if (val != 0 && val != 1)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		up(&hba->host_sem);
+		return -EBUSY;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+
+	if (val == 1)
+		err = ufshcd_update_ee_usr_mask(hba, MASK_EE_URGENT_TEMP, 0);
+	else
+		err = ufshcd_update_ee_usr_mask(hba, 0, MASK_EE_URGENT_TEMP);
+
+	ufshcd_rpm_put_sync(hba);
+
+	up(&hba->host_sem);
+
+	return err;
+}
+
+static umode_t ufs_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
+				    int channel)
+{
+	if (type != hwmon_temp)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_enable:
+		return 0644;
+	case hwmon_temp_crit:
+	case hwmon_temp_lcrit:
+	case hwmon_temp_input:
+		return 0444;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info *ufs_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LCRIT),
+	NULL
+};
+
+static const struct hwmon_ops ufs_hwmon_ops = {
+	.is_visible	= ufs_hwmon_is_visible,
+	.read		= ufs_hwmon_read,
+	.write		= ufs_hwmon_write,
+};
+
+static const struct hwmon_chip_info ufs_hwmon_hba_info = {
+	.ops	= &ufs_hwmon_ops,
+	.info	= ufs_hwmon_info,
+};
+
+void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask)
+{
+	struct device *dev = hba->dev;
+	struct ufs_hwmon_data *data;
+	struct device *hwmon;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return;
+
+	data->hba = hba;
+	data->mask = mask;
+
+	hwmon = hwmon_device_register_with_info(dev, "ufs", data, &ufs_hwmon_hba_info, NULL);
+	if (IS_ERR(hwmon)) {
+		dev_warn(dev, "Failed to instantiate hwmon device\n");
+		kfree(data);
+		return;
+	}
+
+	hba->hwmon_device = hwmon;
+}
+
+void ufs_hwmon_remove(struct ufs_hba *hba)
+{
+	struct ufs_hwmon_data *data;
+
+	if (!hba->hwmon_device)
+		return;
+
+	data = dev_get_drvdata(hba->hwmon_device);
+	hwmon_device_unregister(hba->hwmon_device);
+	hba->hwmon_device = NULL;
+	kfree(data);
+}
+
+void ufs_hwmon_notify_event(struct ufs_hba *hba, u8 ee_mask)
+{
+	if (!hba->hwmon_device)
+		return;
+
+	if (ee_mask & MASK_EE_TOO_HIGH_TEMP)
+		hwmon_notify_event(hba->hwmon_device, hwmon_temp, hwmon_temp_max_alarm, 0);
+
+	if (ee_mask & MASK_EE_TOO_LOW_TEMP)
+		hwmon_notify_event(hba->hwmon_device, hwmon_temp, hwmon_temp_min_alarm, 0);
+}
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
new file mode 100644
index 000000000000..0a088b47d557
--- /dev/null
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -0,0 +1,1268 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Western Digital Corporation
+
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/bitfield.h>
+#include <asm/unaligned.h>
+
+#include <ufs/ufs.h>
+#include "ufs-sysfs.h"
+#include "ufshcd-priv.h"
+
+static const char *ufshcd_uic_link_state_to_string(
+			enum uic_link_state state)
+{
+	switch (state) {
+	case UIC_LINK_OFF_STATE:	return "OFF";
+	case UIC_LINK_ACTIVE_STATE:	return "ACTIVE";
+	case UIC_LINK_HIBERN8_STATE:	return "HIBERN8";
+	case UIC_LINK_BROKEN_STATE:	return "BROKEN";
+	default:			return "UNKNOWN";
+	}
+}
+
+static const char *ufshcd_ufs_dev_pwr_mode_to_string(
+			enum ufs_dev_pwr_mode state)
+{
+	switch (state) {
+	case UFS_ACTIVE_PWR_MODE:	return "ACTIVE";
+	case UFS_SLEEP_PWR_MODE:	return "SLEEP";
+	case UFS_POWERDOWN_PWR_MODE:	return "POWERDOWN";
+	case UFS_DEEPSLEEP_PWR_MODE:	return "DEEPSLEEP";
+	default:			return "UNKNOWN";
+	}
+}
+
+static inline ssize_t ufs_sysfs_pm_lvl_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count,
+					     bool rpm)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	unsigned long flags, value;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	if (value >= UFS_PM_LVL_MAX)
+		return -EINVAL;
+
+	if (ufs_pm_lvl_states[value].dev_state == UFS_DEEPSLEEP_PWR_MODE &&
+	    (!(hba->caps & UFSHCD_CAP_DEEPSLEEP) ||
+	     !(dev_info->wspecversion >= 0x310)))
+		return -EINVAL;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (rpm)
+		hba->rpm_lvl = value;
+	else
+		hba->spm_lvl = value;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return count;
+}
+
+static ssize_t rpm_lvl_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->rpm_lvl);
+}
+
+static ssize_t rpm_lvl_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, true);
+}
+
+static ssize_t rpm_target_dev_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%s\n", ufshcd_ufs_dev_pwr_mode_to_string(
+			ufs_pm_lvl_states[hba->rpm_lvl].dev_state));
+}
+
+static ssize_t rpm_target_link_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%s\n", ufshcd_uic_link_state_to_string(
+			ufs_pm_lvl_states[hba->rpm_lvl].link_state));
+}
+
+static ssize_t spm_lvl_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->spm_lvl);
+}
+
+static ssize_t spm_lvl_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, false);
+}
+
+static ssize_t spm_target_dev_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%s\n", ufshcd_ufs_dev_pwr_mode_to_string(
+				ufs_pm_lvl_states[hba->spm_lvl].dev_state));
+}
+
+static ssize_t spm_target_link_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%s\n", ufshcd_uic_link_state_to_string(
+				ufs_pm_lvl_states[hba->spm_lvl].link_state));
+}
+
+/* Convert Auto-Hibernate Idle Timer register value to microseconds */
+static int ufshcd_ahit_to_us(u32 ahit)
+{
+	int timer = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, ahit);
+	int scale = FIELD_GET(UFSHCI_AHIBERN8_SCALE_MASK, ahit);
+
+	for (; scale > 0; --scale)
+		timer *= UFSHCI_AHIBERN8_SCALE_FACTOR;
+
+	return timer;
+}
+
+/* Convert microseconds to Auto-Hibernate Idle Timer register value */
+static u32 ufshcd_us_to_ahit(unsigned int timer)
+{
+	unsigned int scale;
+
+	for (scale = 0; timer > UFSHCI_AHIBERN8_TIMER_MASK; ++scale)
+		timer /= UFSHCI_AHIBERN8_SCALE_FACTOR;
+
+	return FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, timer) |
+	       FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, scale);
+}
+
+static ssize_t auto_hibern8_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	u32 ahit;
+	int ret;
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	if (!ufshcd_is_auto_hibern8_supported(hba))
+		return -EOPNOTSUPP;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	pm_runtime_get_sync(hba->dev);
+	ufshcd_hold(hba, false);
+	ahit = ufshcd_readl(hba, REG_AUTO_HIBERNATE_IDLE_TIMER);
+	ufshcd_release(hba);
+	pm_runtime_put_sync(hba->dev);
+
+	ret = sysfs_emit(buf, "%d\n", ufshcd_ahit_to_us(ahit));
+
+out:
+	up(&hba->host_sem);
+	return ret;
+}
+
+static ssize_t auto_hibern8_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned int timer;
+	int ret = 0;
+
+	if (!ufshcd_is_auto_hibern8_supported(hba))
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &timer))
+		return -EINVAL;
+
+	if (timer > UFSHCI_AHIBERN8_MAX)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ufshcd_auto_hibern8_update(hba, ufshcd_us_to_ahit(timer));
+
+out:
+	up(&hba->host_sem);
+	return ret ? ret : count;
+}
+
+static ssize_t wb_on_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->dev_info.wb_enabled);
+}
+
+static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned int wb_enable;
+	ssize_t res;
+
+	if (!ufshcd_is_wb_allowed(hba) || ufshcd_is_clkscaling_supported(hba)) {
+		/*
+		 * If the platform supports UFSHCD_CAP_CLK_SCALING, turn WB
+		 * on/off will be done while clock scaling up/down.
+		 */
+		dev_warn(dev, "To control WB through wb_on is not allowed!\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (kstrtouint(buf, 0, &wb_enable))
+		return -EINVAL;
+
+	if (wb_enable != 0 && wb_enable != 1)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		res = -EBUSY;
+		goto out;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+	res = ufshcd_wb_toggle(hba, wb_enable);
+	ufshcd_rpm_put_sync(hba);
+out:
+	up(&hba->host_sem);
+	return res < 0 ? res : count;
+}
+
+static DEVICE_ATTR_RW(rpm_lvl);
+static DEVICE_ATTR_RO(rpm_target_dev_state);
+static DEVICE_ATTR_RO(rpm_target_link_state);
+static DEVICE_ATTR_RW(spm_lvl);
+static DEVICE_ATTR_RO(spm_target_dev_state);
+static DEVICE_ATTR_RO(spm_target_link_state);
+static DEVICE_ATTR_RW(auto_hibern8);
+static DEVICE_ATTR_RW(wb_on);
+
+static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
+	&dev_attr_rpm_lvl.attr,
+	&dev_attr_rpm_target_dev_state.attr,
+	&dev_attr_rpm_target_link_state.attr,
+	&dev_attr_spm_lvl.attr,
+	&dev_attr_spm_target_dev_state.attr,
+	&dev_attr_spm_target_link_state.attr,
+	&dev_attr_auto_hibern8.attr,
+	&dev_attr_wb_on.attr,
+	NULL
+};
+
+static const struct attribute_group ufs_sysfs_default_group = {
+	.attrs = ufs_sysfs_ufshcd_attrs,
+};
+
+static ssize_t monitor_enable_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->monitor.enabled);
+}
+
+static ssize_t monitor_enable_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned long value, flags;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	value = !!value;
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (value == hba->monitor.enabled)
+		goto out_unlock;
+
+	if (!value) {
+		memset(&hba->monitor, 0, sizeof(hba->monitor));
+	} else {
+		hba->monitor.enabled = true;
+		hba->monitor.enabled_ts = ktime_get();
+	}
+
+out_unlock:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return count;
+}
+
+static ssize_t monitor_chunk_size_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->monitor.chunk_size);
+}
+
+static ssize_t monitor_chunk_size_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned long value, flags;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	/* Only allow chunk size change when monitor is disabled */
+	if (!hba->monitor.enabled)
+		hba->monitor.chunk_size = value;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return count;
+}
+
+static ssize_t read_total_sectors_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->monitor.nr_sec_rw[READ]);
+}
+
+static ssize_t read_total_busy_show(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.total_busy[READ]));
+}
+
+static ssize_t read_nr_requests_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->monitor.nr_req[READ]);
+}
+
+static ssize_t read_req_latency_avg_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	struct ufs_hba_monitor *m = &hba->monitor;
+
+	return sysfs_emit(buf, "%llu\n", div_u64(ktime_to_us(m->lat_sum[READ]),
+						 m->nr_req[READ]));
+}
+
+static ssize_t read_req_latency_max_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_max[READ]));
+}
+
+static ssize_t read_req_latency_min_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_min[READ]));
+}
+
+static ssize_t read_req_latency_sum_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_sum[READ]));
+}
+
+static ssize_t write_total_sectors_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->monitor.nr_sec_rw[WRITE]);
+}
+
+static ssize_t write_total_busy_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.total_busy[WRITE]));
+}
+
+static ssize_t write_nr_requests_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->monitor.nr_req[WRITE]);
+}
+
+static ssize_t write_req_latency_avg_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	struct ufs_hba_monitor *m = &hba->monitor;
+
+	return sysfs_emit(buf, "%llu\n", div_u64(ktime_to_us(m->lat_sum[WRITE]),
+						 m->nr_req[WRITE]));
+}
+
+static ssize_t write_req_latency_max_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_max[WRITE]));
+}
+
+static ssize_t write_req_latency_min_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_min[WRITE]));
+}
+
+static ssize_t write_req_latency_sum_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%llu\n",
+			  ktime_to_us(hba->monitor.lat_sum[WRITE]));
+}
+
+static DEVICE_ATTR_RW(monitor_enable);
+static DEVICE_ATTR_RW(monitor_chunk_size);
+static DEVICE_ATTR_RO(read_total_sectors);
+static DEVICE_ATTR_RO(read_total_busy);
+static DEVICE_ATTR_RO(read_nr_requests);
+static DEVICE_ATTR_RO(read_req_latency_avg);
+static DEVICE_ATTR_RO(read_req_latency_max);
+static DEVICE_ATTR_RO(read_req_latency_min);
+static DEVICE_ATTR_RO(read_req_latency_sum);
+static DEVICE_ATTR_RO(write_total_sectors);
+static DEVICE_ATTR_RO(write_total_busy);
+static DEVICE_ATTR_RO(write_nr_requests);
+static DEVICE_ATTR_RO(write_req_latency_avg);
+static DEVICE_ATTR_RO(write_req_latency_max);
+static DEVICE_ATTR_RO(write_req_latency_min);
+static DEVICE_ATTR_RO(write_req_latency_sum);
+
+static struct attribute *ufs_sysfs_monitor_attrs[] = {
+	&dev_attr_monitor_enable.attr,
+	&dev_attr_monitor_chunk_size.attr,
+	&dev_attr_read_total_sectors.attr,
+	&dev_attr_read_total_busy.attr,
+	&dev_attr_read_nr_requests.attr,
+	&dev_attr_read_req_latency_avg.attr,
+	&dev_attr_read_req_latency_max.attr,
+	&dev_attr_read_req_latency_min.attr,
+	&dev_attr_read_req_latency_sum.attr,
+	&dev_attr_write_total_sectors.attr,
+	&dev_attr_write_total_busy.attr,
+	&dev_attr_write_nr_requests.attr,
+	&dev_attr_write_req_latency_avg.attr,
+	&dev_attr_write_req_latency_max.attr,
+	&dev_attr_write_req_latency_min.attr,
+	&dev_attr_write_req_latency_sum.attr,
+	NULL
+};
+
+static const struct attribute_group ufs_sysfs_monitor_group = {
+	.name = "monitor",
+	.attrs = ufs_sysfs_monitor_attrs,
+};
+
+static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
+				  enum desc_idn desc_id,
+				  u8 desc_index,
+				  u8 param_offset,
+				  u8 *sysfs_buf,
+				  u8 param_size)
+{
+	u8 desc_buf[8] = {0};
+	int ret;
+
+	if (param_size > 8)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
+				param_offset, desc_buf, param_size);
+	ufshcd_rpm_put_sync(hba);
+	if (ret) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	switch (param_size) {
+	case 1:
+		ret = sysfs_emit(sysfs_buf, "0x%02X\n", *desc_buf);
+		break;
+	case 2:
+		ret = sysfs_emit(sysfs_buf, "0x%04X\n",
+			get_unaligned_be16(desc_buf));
+		break;
+	case 4:
+		ret = sysfs_emit(sysfs_buf, "0x%08X\n",
+			get_unaligned_be32(desc_buf));
+		break;
+	case 8:
+		ret = sysfs_emit(sysfs_buf, "0x%016llX\n",
+			get_unaligned_be64(desc_buf));
+		break;
+	}
+
+out:
+	up(&hba->host_sem);
+	return ret;
+}
+
+#define UFS_DESC_PARAM(_name, _puname, _duname, _size)			\
+static ssize_t _name##_show(struct device *dev,				\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
+		0, _duname##_DESC_PARAM##_puname, buf, _size);		\
+}									\
+static DEVICE_ATTR_RO(_name)
+
+#define UFS_DEVICE_DESC_PARAM(_name, _uname, _size)			\
+	UFS_DESC_PARAM(_name, _uname, DEVICE, _size)
+
+UFS_DEVICE_DESC_PARAM(device_type, _DEVICE_TYPE, 1);
+UFS_DEVICE_DESC_PARAM(device_class, _DEVICE_CLASS, 1);
+UFS_DEVICE_DESC_PARAM(device_sub_class, _DEVICE_SUB_CLASS, 1);
+UFS_DEVICE_DESC_PARAM(protocol, _PRTCL, 1);
+UFS_DEVICE_DESC_PARAM(number_of_luns, _NUM_LU, 1);
+UFS_DEVICE_DESC_PARAM(number_of_wluns, _NUM_WLU, 1);
+UFS_DEVICE_DESC_PARAM(boot_enable, _BOOT_ENBL, 1);
+UFS_DEVICE_DESC_PARAM(descriptor_access_enable, _DESC_ACCSS_ENBL, 1);
+UFS_DEVICE_DESC_PARAM(initial_power_mode, _INIT_PWR_MODE, 1);
+UFS_DEVICE_DESC_PARAM(high_priority_lun, _HIGH_PR_LUN, 1);
+UFS_DEVICE_DESC_PARAM(secure_removal_type, _SEC_RMV_TYPE, 1);
+UFS_DEVICE_DESC_PARAM(support_security_lun, _SEC_LU, 1);
+UFS_DEVICE_DESC_PARAM(bkops_termination_latency, _BKOP_TERM_LT, 1);
+UFS_DEVICE_DESC_PARAM(initial_active_icc_level, _ACTVE_ICC_LVL, 1);
+UFS_DEVICE_DESC_PARAM(specification_version, _SPEC_VER, 2);
+UFS_DEVICE_DESC_PARAM(manufacturing_date, _MANF_DATE, 2);
+UFS_DEVICE_DESC_PARAM(manufacturer_id, _MANF_ID, 2);
+UFS_DEVICE_DESC_PARAM(rtt_capability, _RTT_CAP, 1);
+UFS_DEVICE_DESC_PARAM(rtc_update, _FRQ_RTC, 2);
+UFS_DEVICE_DESC_PARAM(ufs_features, _UFS_FEAT, 1);
+UFS_DEVICE_DESC_PARAM(ffu_timeout, _FFU_TMT, 1);
+UFS_DEVICE_DESC_PARAM(queue_depth, _Q_DPTH, 1);
+UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);
+UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);
+UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);
+UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);
+UFS_DEVICE_DESC_PARAM(hpb_version, _HPB_VER, 2);
+UFS_DEVICE_DESC_PARAM(hpb_control, _HPB_CONTROL, 1);
+UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);
+UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_PRESRV_USRSPC_EN, 1);
+UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);
+UFS_DEVICE_DESC_PARAM(wb_shared_alloc_units, _WB_SHARED_ALLOC_UNITS, 4);
+
+static struct attribute *ufs_sysfs_device_descriptor[] = {
+	&dev_attr_device_type.attr,
+	&dev_attr_device_class.attr,
+	&dev_attr_device_sub_class.attr,
+	&dev_attr_protocol.attr,
+	&dev_attr_number_of_luns.attr,
+	&dev_attr_number_of_wluns.attr,
+	&dev_attr_boot_enable.attr,
+	&dev_attr_descriptor_access_enable.attr,
+	&dev_attr_initial_power_mode.attr,
+	&dev_attr_high_priority_lun.attr,
+	&dev_attr_secure_removal_type.attr,
+	&dev_attr_support_security_lun.attr,
+	&dev_attr_bkops_termination_latency.attr,
+	&dev_attr_initial_active_icc_level.attr,
+	&dev_attr_specification_version.attr,
+	&dev_attr_manufacturing_date.attr,
+	&dev_attr_manufacturer_id.attr,
+	&dev_attr_rtt_capability.attr,
+	&dev_attr_rtc_update.attr,
+	&dev_attr_ufs_features.attr,
+	&dev_attr_ffu_timeout.attr,
+	&dev_attr_queue_depth.attr,
+	&dev_attr_device_version.attr,
+	&dev_attr_number_of_secure_wpa.attr,
+	&dev_attr_psa_max_data_size.attr,
+	&dev_attr_psa_state_timeout.attr,
+	&dev_attr_hpb_version.attr,
+	&dev_attr_hpb_control.attr,
+	&dev_attr_ext_feature_sup.attr,
+	&dev_attr_wb_presv_us_en.attr,
+	&dev_attr_wb_type.attr,
+	&dev_attr_wb_shared_alloc_units.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_device_descriptor_group = {
+	.name = "device_descriptor",
+	.attrs = ufs_sysfs_device_descriptor,
+};
+
+#define UFS_INTERCONNECT_DESC_PARAM(_name, _uname, _size)		\
+	UFS_DESC_PARAM(_name, _uname, INTERCONNECT, _size)
+
+UFS_INTERCONNECT_DESC_PARAM(unipro_version, _UNIPRO_VER, 2);
+UFS_INTERCONNECT_DESC_PARAM(mphy_version, _MPHY_VER, 2);
+
+static struct attribute *ufs_sysfs_interconnect_descriptor[] = {
+	&dev_attr_unipro_version.attr,
+	&dev_attr_mphy_version.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_interconnect_descriptor_group = {
+	.name = "interconnect_descriptor",
+	.attrs = ufs_sysfs_interconnect_descriptor,
+};
+
+#define UFS_GEOMETRY_DESC_PARAM(_name, _uname, _size)			\
+	UFS_DESC_PARAM(_name, _uname, GEOMETRY, _size)
+
+UFS_GEOMETRY_DESC_PARAM(raw_device_capacity, _DEV_CAP, 8);
+UFS_GEOMETRY_DESC_PARAM(max_number_of_luns, _MAX_NUM_LUN, 1);
+UFS_GEOMETRY_DESC_PARAM(segment_size, _SEG_SIZE, 4);
+UFS_GEOMETRY_DESC_PARAM(allocation_unit_size, _ALLOC_UNIT_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(min_addressable_block_size, _MIN_BLK_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(optimal_read_block_size, _OPT_RD_BLK_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(optimal_write_block_size, _OPT_WR_BLK_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(max_in_buffer_size, _MAX_IN_BUF_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(max_out_buffer_size, _MAX_OUT_BUF_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(rpmb_rw_size, _RPMB_RW_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(dyn_capacity_resource_policy, _DYN_CAP_RSRC_PLC, 1);
+UFS_GEOMETRY_DESC_PARAM(data_ordering, _DATA_ORDER, 1);
+UFS_GEOMETRY_DESC_PARAM(max_number_of_contexts, _MAX_NUM_CTX, 1);
+UFS_GEOMETRY_DESC_PARAM(sys_data_tag_unit_size, _TAG_UNIT_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(sys_data_tag_resource_size, _TAG_RSRC_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(secure_removal_types, _SEC_RM_TYPES, 1);
+UFS_GEOMETRY_DESC_PARAM(memory_types, _MEM_TYPES, 2);
+UFS_GEOMETRY_DESC_PARAM(sys_code_memory_max_alloc_units,
+	_SCM_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(sys_code_memory_capacity_adjustment_factor,
+	_SCM_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(non_persist_memory_max_alloc_units,
+	_NPM_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(non_persist_memory_capacity_adjustment_factor,
+	_NPM_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(enh1_memory_max_alloc_units,
+	_ENM1_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(enh1_memory_capacity_adjustment_factor,
+	_ENM1_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(enh2_memory_max_alloc_units,
+	_ENM2_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(enh2_memory_capacity_adjustment_factor,
+	_ENM2_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(enh3_memory_max_alloc_units,
+	_ENM3_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(enh3_memory_capacity_adjustment_factor,
+	_ENM3_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(enh4_memory_max_alloc_units,
+	_ENM4_MAX_NUM_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(enh4_memory_capacity_adjustment_factor,
+	_ENM4_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(hpb_region_size, _HPB_REGION_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_number_lu, _HPB_NUMBER_LU, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_subregion_size, _HPB_SUBREGION_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_max_active_regions, _HPB_MAX_ACTIVE_REGS, 2);
+UFS_GEOMETRY_DESC_PARAM(wb_max_alloc_units, _WB_MAX_ALLOC_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(wb_max_wb_luns, _WB_MAX_WB_LUNS, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_buff_cap_adj, _WB_BUFF_CAP_ADJ, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_sup_red_type, _WB_SUP_RED_TYPE, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_sup_wb_type, _WB_SUP_WB_TYPE, 1);
+
+
+static struct attribute *ufs_sysfs_geometry_descriptor[] = {
+	&dev_attr_raw_device_capacity.attr,
+	&dev_attr_max_number_of_luns.attr,
+	&dev_attr_segment_size.attr,
+	&dev_attr_allocation_unit_size.attr,
+	&dev_attr_min_addressable_block_size.attr,
+	&dev_attr_optimal_read_block_size.attr,
+	&dev_attr_optimal_write_block_size.attr,
+	&dev_attr_max_in_buffer_size.attr,
+	&dev_attr_max_out_buffer_size.attr,
+	&dev_attr_rpmb_rw_size.attr,
+	&dev_attr_dyn_capacity_resource_policy.attr,
+	&dev_attr_data_ordering.attr,
+	&dev_attr_max_number_of_contexts.attr,
+	&dev_attr_sys_data_tag_unit_size.attr,
+	&dev_attr_sys_data_tag_resource_size.attr,
+	&dev_attr_secure_removal_types.attr,
+	&dev_attr_memory_types.attr,
+	&dev_attr_sys_code_memory_max_alloc_units.attr,
+	&dev_attr_sys_code_memory_capacity_adjustment_factor.attr,
+	&dev_attr_non_persist_memory_max_alloc_units.attr,
+	&dev_attr_non_persist_memory_capacity_adjustment_factor.attr,
+	&dev_attr_enh1_memory_max_alloc_units.attr,
+	&dev_attr_enh1_memory_capacity_adjustment_factor.attr,
+	&dev_attr_enh2_memory_max_alloc_units.attr,
+	&dev_attr_enh2_memory_capacity_adjustment_factor.attr,
+	&dev_attr_enh3_memory_max_alloc_units.attr,
+	&dev_attr_enh3_memory_capacity_adjustment_factor.attr,
+	&dev_attr_enh4_memory_max_alloc_units.attr,
+	&dev_attr_enh4_memory_capacity_adjustment_factor.attr,
+	&dev_attr_hpb_region_size.attr,
+	&dev_attr_hpb_number_lu.attr,
+	&dev_attr_hpb_subregion_size.attr,
+	&dev_attr_hpb_max_active_regions.attr,
+	&dev_attr_wb_max_alloc_units.attr,
+	&dev_attr_wb_max_wb_luns.attr,
+	&dev_attr_wb_buff_cap_adj.attr,
+	&dev_attr_wb_sup_red_type.attr,
+	&dev_attr_wb_sup_wb_type.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_geometry_descriptor_group = {
+	.name = "geometry_descriptor",
+	.attrs = ufs_sysfs_geometry_descriptor,
+};
+
+#define UFS_HEALTH_DESC_PARAM(_name, _uname, _size)			\
+	UFS_DESC_PARAM(_name, _uname, HEALTH, _size)
+
+UFS_HEALTH_DESC_PARAM(eol_info, _EOL_INFO, 1);
+UFS_HEALTH_DESC_PARAM(life_time_estimation_a, _LIFE_TIME_EST_A, 1);
+UFS_HEALTH_DESC_PARAM(life_time_estimation_b, _LIFE_TIME_EST_B, 1);
+
+static struct attribute *ufs_sysfs_health_descriptor[] = {
+	&dev_attr_eol_info.attr,
+	&dev_attr_life_time_estimation_a.attr,
+	&dev_attr_life_time_estimation_b.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_health_descriptor_group = {
+	.name = "health_descriptor",
+	.attrs = ufs_sysfs_health_descriptor,
+};
+
+#define UFS_POWER_DESC_PARAM(_name, _uname, _index)			\
+static ssize_t _name##_index##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_POWER, 0,	\
+		PWR_DESC##_uname##_0 + _index * 2, buf, 2);		\
+}									\
+static DEVICE_ATTR_RO(_name##_index)
+
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 15);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 15);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 15);
+
+static struct attribute *ufs_sysfs_power_descriptor[] = {
+	&dev_attr_active_icc_levels_vcc0.attr,
+	&dev_attr_active_icc_levels_vcc1.attr,
+	&dev_attr_active_icc_levels_vcc2.attr,
+	&dev_attr_active_icc_levels_vcc3.attr,
+	&dev_attr_active_icc_levels_vcc4.attr,
+	&dev_attr_active_icc_levels_vcc5.attr,
+	&dev_attr_active_icc_levels_vcc6.attr,
+	&dev_attr_active_icc_levels_vcc7.attr,
+	&dev_attr_active_icc_levels_vcc8.attr,
+	&dev_attr_active_icc_levels_vcc9.attr,
+	&dev_attr_active_icc_levels_vcc10.attr,
+	&dev_attr_active_icc_levels_vcc11.attr,
+	&dev_attr_active_icc_levels_vcc12.attr,
+	&dev_attr_active_icc_levels_vcc13.attr,
+	&dev_attr_active_icc_levels_vcc14.attr,
+	&dev_attr_active_icc_levels_vcc15.attr,
+	&dev_attr_active_icc_levels_vccq0.attr,
+	&dev_attr_active_icc_levels_vccq1.attr,
+	&dev_attr_active_icc_levels_vccq2.attr,
+	&dev_attr_active_icc_levels_vccq3.attr,
+	&dev_attr_active_icc_levels_vccq4.attr,
+	&dev_attr_active_icc_levels_vccq5.attr,
+	&dev_attr_active_icc_levels_vccq6.attr,
+	&dev_attr_active_icc_levels_vccq7.attr,
+	&dev_attr_active_icc_levels_vccq8.attr,
+	&dev_attr_active_icc_levels_vccq9.attr,
+	&dev_attr_active_icc_levels_vccq10.attr,
+	&dev_attr_active_icc_levels_vccq11.attr,
+	&dev_attr_active_icc_levels_vccq12.attr,
+	&dev_attr_active_icc_levels_vccq13.attr,
+	&dev_attr_active_icc_levels_vccq14.attr,
+	&dev_attr_active_icc_levels_vccq15.attr,
+	&dev_attr_active_icc_levels_vccq20.attr,
+	&dev_attr_active_icc_levels_vccq21.attr,
+	&dev_attr_active_icc_levels_vccq22.attr,
+	&dev_attr_active_icc_levels_vccq23.attr,
+	&dev_attr_active_icc_levels_vccq24.attr,
+	&dev_attr_active_icc_levels_vccq25.attr,
+	&dev_attr_active_icc_levels_vccq26.attr,
+	&dev_attr_active_icc_levels_vccq27.attr,
+	&dev_attr_active_icc_levels_vccq28.attr,
+	&dev_attr_active_icc_levels_vccq29.attr,
+	&dev_attr_active_icc_levels_vccq210.attr,
+	&dev_attr_active_icc_levels_vccq211.attr,
+	&dev_attr_active_icc_levels_vccq212.attr,
+	&dev_attr_active_icc_levels_vccq213.attr,
+	&dev_attr_active_icc_levels_vccq214.attr,
+	&dev_attr_active_icc_levels_vccq215.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_power_descriptor_group = {
+	.name = "power_descriptor",
+	.attrs = ufs_sysfs_power_descriptor,
+};
+
+#define UFS_STRING_DESCRIPTOR(_name, _pname)				\
+static ssize_t _name##_show(struct device *dev,				\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	u8 index;							\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	int ret;							\
+	int desc_len = QUERY_DESC_MAX_SIZE;				\
+	u8 *desc_buf;							\
+									\
+	down(&hba->host_sem);						\
+	if (!ufshcd_is_user_access_allowed(hba)) {			\
+		up(&hba->host_sem);					\
+		return -EBUSY;						\
+	}								\
+	desc_buf = kzalloc(QUERY_DESC_MAX_SIZE, GFP_ATOMIC);		\
+	if (!desc_buf) {						\
+		up(&hba->host_sem);					\
+		return -ENOMEM;						\
+	}								\
+	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_query_descriptor_retry(hba,			\
+		UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE,	\
+		0, 0, desc_buf, &desc_len);				\
+	if (ret) {							\
+		ret = -EINVAL;						\
+		goto out;						\
+	}								\
+	index = desc_buf[DEVICE_DESC_PARAM##_pname];			\
+	kfree(desc_buf);						\
+	desc_buf = NULL;						\
+	ret = ufshcd_read_string_desc(hba, index, &desc_buf,		\
+				      SD_ASCII_STD);			\
+	if (ret < 0)							\
+		goto out;						\
+	ret = sysfs_emit(buf, "%s\n", desc_buf);			\
+out:									\
+	ufshcd_rpm_put_sync(hba);					\
+	kfree(desc_buf);						\
+	up(&hba->host_sem);						\
+	return ret;							\
+}									\
+static DEVICE_ATTR_RO(_name)
+
+UFS_STRING_DESCRIPTOR(manufacturer_name, _MANF_NAME);
+UFS_STRING_DESCRIPTOR(product_name, _PRDCT_NAME);
+UFS_STRING_DESCRIPTOR(oem_id, _OEM_ID);
+UFS_STRING_DESCRIPTOR(serial_number, _SN);
+UFS_STRING_DESCRIPTOR(product_revision, _PRDCT_REV);
+
+static struct attribute *ufs_sysfs_string_descriptors[] = {
+	&dev_attr_manufacturer_name.attr,
+	&dev_attr_product_name.attr,
+	&dev_attr_oem_id.attr,
+	&dev_attr_serial_number.attr,
+	&dev_attr_product_revision.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_string_descriptors_group = {
+	.name = "string_descriptors",
+	.attrs = ufs_sysfs_string_descriptors,
+};
+
+static inline bool ufshcd_is_wb_flags(enum flag_idn idn)
+{
+	return idn >= QUERY_FLAG_IDN_WB_EN &&
+		idn <= QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8;
+}
+
+#define UFS_FLAG(_name, _uname)						\
+static ssize_t _name##_show(struct device *dev,				\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	bool flag;							\
+	u8 index = 0;							\
+	int ret;							\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+									\
+	down(&hba->host_sem);						\
+	if (!ufshcd_is_user_access_allowed(hba)) {			\
+		up(&hba->host_sem);					\
+		return -EBUSY;						\
+	}								\
+	if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname))			\
+		index = ufshcd_wb_get_query_index(hba);			\
+	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,	\
+		QUERY_FLAG_IDN##_uname, index, &flag);			\
+	ufshcd_rpm_put_sync(hba);					\
+	if (ret) {							\
+		ret = -EINVAL;						\
+		goto out;						\
+	}								\
+	ret = sysfs_emit(buf, "%s\n", flag ? "true" : "false");		\
+out:									\
+	up(&hba->host_sem);						\
+	return ret;							\
+}									\
+static DEVICE_ATTR_RO(_name)
+
+UFS_FLAG(device_init, _FDEVICEINIT);
+UFS_FLAG(permanent_wpe, _PERMANENT_WPE);
+UFS_FLAG(power_on_wpe, _PWR_ON_WPE);
+UFS_FLAG(bkops_enable, _BKOPS_EN);
+UFS_FLAG(life_span_mode_enable, _LIFE_SPAN_MODE_ENABLE);
+UFS_FLAG(phy_resource_removal, _FPHYRESOURCEREMOVAL);
+UFS_FLAG(busy_rtc, _BUSY_RTC);
+UFS_FLAG(disable_fw_update, _PERMANENTLY_DISABLE_FW_UPDATE);
+UFS_FLAG(wb_enable, _WB_EN);
+UFS_FLAG(wb_flush_en, _WB_BUFF_FLUSH_EN);
+UFS_FLAG(wb_flush_during_h8, _WB_BUFF_FLUSH_DURING_HIBERN8);
+UFS_FLAG(hpb_enable, _HPB_EN);
+
+static struct attribute *ufs_sysfs_device_flags[] = {
+	&dev_attr_device_init.attr,
+	&dev_attr_permanent_wpe.attr,
+	&dev_attr_power_on_wpe.attr,
+	&dev_attr_bkops_enable.attr,
+	&dev_attr_life_span_mode_enable.attr,
+	&dev_attr_phy_resource_removal.attr,
+	&dev_attr_busy_rtc.attr,
+	&dev_attr_disable_fw_update.attr,
+	&dev_attr_wb_enable.attr,
+	&dev_attr_wb_flush_en.attr,
+	&dev_attr_wb_flush_during_h8.attr,
+	&dev_attr_hpb_enable.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_flags_group = {
+	.name = "flags",
+	.attrs = ufs_sysfs_device_flags,
+};
+
+static inline bool ufshcd_is_wb_attrs(enum attr_idn idn)
+{
+	return idn >= QUERY_ATTR_IDN_WB_FLUSH_STATUS &&
+		idn <= QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE;
+}
+
+#define UFS_ATTRIBUTE(_name, _uname)					\
+static ssize_t _name##_show(struct device *dev,				\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	u32 value;							\
+	int ret;							\
+	u8 index = 0;							\
+									\
+	down(&hba->host_sem);						\
+	if (!ufshcd_is_user_access_allowed(hba)) {			\
+		up(&hba->host_sem);					\
+		return -EBUSY;						\
+	}								\
+	if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname))			\
+		index = ufshcd_wb_get_query_index(hba);			\
+	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,	\
+		QUERY_ATTR_IDN##_uname, index, 0, &value);		\
+	ufshcd_rpm_put_sync(hba);					\
+	if (ret) {							\
+		ret = -EINVAL;						\
+		goto out;						\
+	}								\
+	ret = sysfs_emit(buf, "0x%08X\n", value);			\
+out:									\
+	up(&hba->host_sem);						\
+	return ret;							\
+}									\
+static DEVICE_ATTR_RO(_name)
+
+UFS_ATTRIBUTE(boot_lun_enabled, _BOOT_LU_EN);
+UFS_ATTRIBUTE(max_data_size_hpb_single_cmd, _MAX_HPB_SINGLE_CMD);
+UFS_ATTRIBUTE(current_power_mode, _POWER_MODE);
+UFS_ATTRIBUTE(active_icc_level, _ACTIVE_ICC_LVL);
+UFS_ATTRIBUTE(ooo_data_enabled, _OOO_DATA_EN);
+UFS_ATTRIBUTE(bkops_status, _BKOPS_STATUS);
+UFS_ATTRIBUTE(purge_status, _PURGE_STATUS);
+UFS_ATTRIBUTE(max_data_in_size, _MAX_DATA_IN);
+UFS_ATTRIBUTE(max_data_out_size, _MAX_DATA_OUT);
+UFS_ATTRIBUTE(reference_clock_frequency, _REF_CLK_FREQ);
+UFS_ATTRIBUTE(configuration_descriptor_lock, _CONF_DESC_LOCK);
+UFS_ATTRIBUTE(max_number_of_rtt, _MAX_NUM_OF_RTT);
+UFS_ATTRIBUTE(exception_event_control, _EE_CONTROL);
+UFS_ATTRIBUTE(exception_event_status, _EE_STATUS);
+UFS_ATTRIBUTE(ffu_status, _FFU_STATUS);
+UFS_ATTRIBUTE(psa_state, _PSA_STATE);
+UFS_ATTRIBUTE(psa_data_size, _PSA_DATA_SIZE);
+UFS_ATTRIBUTE(wb_flush_status, _WB_FLUSH_STATUS);
+UFS_ATTRIBUTE(wb_avail_buf, _AVAIL_WB_BUFF_SIZE);
+UFS_ATTRIBUTE(wb_life_time_est, _WB_BUFF_LIFE_TIME_EST);
+UFS_ATTRIBUTE(wb_cur_buf, _CURR_WB_BUFF_SIZE);
+
+
+static struct attribute *ufs_sysfs_attributes[] = {
+	&dev_attr_boot_lun_enabled.attr,
+	&dev_attr_max_data_size_hpb_single_cmd.attr,
+	&dev_attr_current_power_mode.attr,
+	&dev_attr_active_icc_level.attr,
+	&dev_attr_ooo_data_enabled.attr,
+	&dev_attr_bkops_status.attr,
+	&dev_attr_purge_status.attr,
+	&dev_attr_max_data_in_size.attr,
+	&dev_attr_max_data_out_size.attr,
+	&dev_attr_reference_clock_frequency.attr,
+	&dev_attr_configuration_descriptor_lock.attr,
+	&dev_attr_max_number_of_rtt.attr,
+	&dev_attr_exception_event_control.attr,
+	&dev_attr_exception_event_status.attr,
+	&dev_attr_ffu_status.attr,
+	&dev_attr_psa_state.attr,
+	&dev_attr_psa_data_size.attr,
+	&dev_attr_wb_flush_status.attr,
+	&dev_attr_wb_avail_buf.attr,
+	&dev_attr_wb_life_time_est.attr,
+	&dev_attr_wb_cur_buf.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_attributes_group = {
+	.name = "attributes",
+	.attrs = ufs_sysfs_attributes,
+};
+
+static const struct attribute_group *ufs_sysfs_groups[] = {
+	&ufs_sysfs_default_group,
+	&ufs_sysfs_monitor_group,
+	&ufs_sysfs_device_descriptor_group,
+	&ufs_sysfs_interconnect_descriptor_group,
+	&ufs_sysfs_geometry_descriptor_group,
+	&ufs_sysfs_health_descriptor_group,
+	&ufs_sysfs_power_descriptor_group,
+	&ufs_sysfs_string_descriptors_group,
+	&ufs_sysfs_flags_group,
+	&ufs_sysfs_attributes_group,
+	NULL,
+};
+
+#define UFS_LUN_DESC_PARAM(_pname, _puname, _duname, _size)		\
+static ssize_t _pname##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct scsi_device *sdev = to_scsi_device(dev);			\
+	struct ufs_hba *hba = shost_priv(sdev->host);			\
+	u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);			\
+	if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun,		\
+				_duname##_DESC_PARAM##_puname))		\
+		return -EINVAL;						\
+	return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname,	\
+		lun, _duname##_DESC_PARAM##_puname, buf, _size);	\
+}									\
+static DEVICE_ATTR_RO(_pname)
+
+#define UFS_UNIT_DESC_PARAM(_name, _uname, _size)			\
+	UFS_LUN_DESC_PARAM(_name, _uname, UNIT, _size)
+
+UFS_UNIT_DESC_PARAM(lu_enable, _LU_ENABLE, 1);
+UFS_UNIT_DESC_PARAM(boot_lun_id, _BOOT_LUN_ID, 1);
+UFS_UNIT_DESC_PARAM(lun_write_protect, _LU_WR_PROTECT, 1);
+UFS_UNIT_DESC_PARAM(lun_queue_depth, _LU_Q_DEPTH, 1);
+UFS_UNIT_DESC_PARAM(psa_sensitive, _PSA_SENSITIVE, 1);
+UFS_UNIT_DESC_PARAM(lun_memory_type, _MEM_TYPE, 1);
+UFS_UNIT_DESC_PARAM(data_reliability, _DATA_RELIABILITY, 1);
+UFS_UNIT_DESC_PARAM(logical_block_size, _LOGICAL_BLK_SIZE, 1);
+UFS_UNIT_DESC_PARAM(logical_block_count, _LOGICAL_BLK_COUNT, 8);
+UFS_UNIT_DESC_PARAM(erase_block_size, _ERASE_BLK_SIZE, 4);
+UFS_UNIT_DESC_PARAM(provisioning_type, _PROVISIONING_TYPE, 1);
+UFS_UNIT_DESC_PARAM(physical_memory_resourse_count, _PHY_MEM_RSRC_CNT, 8);
+UFS_UNIT_DESC_PARAM(context_capabilities, _CTX_CAPABILITIES, 2);
+UFS_UNIT_DESC_PARAM(large_unit_granularity, _LARGE_UNIT_SIZE_M1, 1);
+UFS_UNIT_DESC_PARAM(hpb_lu_max_active_regions, _HPB_LU_MAX_ACTIVE_RGNS, 2);
+UFS_UNIT_DESC_PARAM(hpb_pinned_region_start_offset, _HPB_PIN_RGN_START_OFF, 2);
+UFS_UNIT_DESC_PARAM(hpb_number_pinned_regions, _HPB_NUM_PIN_RGNS, 2);
+UFS_UNIT_DESC_PARAM(wb_buf_alloc_units, _WB_BUF_ALLOC_UNITS, 4);
+
+static struct attribute *ufs_sysfs_unit_descriptor[] = {
+	&dev_attr_lu_enable.attr,
+	&dev_attr_boot_lun_id.attr,
+	&dev_attr_lun_write_protect.attr,
+	&dev_attr_lun_queue_depth.attr,
+	&dev_attr_psa_sensitive.attr,
+	&dev_attr_lun_memory_type.attr,
+	&dev_attr_data_reliability.attr,
+	&dev_attr_logical_block_size.attr,
+	&dev_attr_logical_block_count.attr,
+	&dev_attr_erase_block_size.attr,
+	&dev_attr_provisioning_type.attr,
+	&dev_attr_physical_memory_resourse_count.attr,
+	&dev_attr_context_capabilities.attr,
+	&dev_attr_large_unit_granularity.attr,
+	&dev_attr_hpb_lu_max_active_regions.attr,
+	&dev_attr_hpb_pinned_region_start_offset.attr,
+	&dev_attr_hpb_number_pinned_regions.attr,
+	&dev_attr_wb_buf_alloc_units.attr,
+	NULL,
+};
+
+const struct attribute_group ufs_sysfs_unit_descriptor_group = {
+	.name = "unit_descriptor",
+	.attrs = ufs_sysfs_unit_descriptor,
+};
+
+static ssize_t dyn_cap_needed_attribute_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	u32 value;
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba = shost_priv(sdev->host);
+	u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);
+	int ret;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+		QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value);
+	ufshcd_rpm_put_sync(hba);
+	if (ret) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = sysfs_emit(buf, "0x%08X\n", value);
+
+out:
+	up(&hba->host_sem);
+	return ret;
+}
+static DEVICE_ATTR_RO(dyn_cap_needed_attribute);
+
+static struct attribute *ufs_sysfs_lun_attributes[] = {
+	&dev_attr_dyn_cap_needed_attribute.attr,
+	NULL,
+};
+
+const struct attribute_group ufs_sysfs_lun_attributes_group = {
+	.attrs = ufs_sysfs_lun_attributes,
+};
+
+void ufs_sysfs_add_nodes(struct device *dev)
+{
+	int ret;
+
+	ret = sysfs_create_groups(&dev->kobj, ufs_sysfs_groups);
+	if (ret)
+		dev_err(dev,
+			"%s: sysfs groups creation failed (err = %d)\n",
+			__func__, ret);
+}
+
+void ufs_sysfs_remove_nodes(struct device *dev)
+{
+	sysfs_remove_groups(&dev->kobj, ufs_sysfs_groups);
+}
diff --git a/drivers/ufs/core/ufs-sysfs.h b/drivers/ufs/core/ufs-sysfs.h
new file mode 100644
index 000000000000..8d94af3b8077
--- /dev/null
+++ b/drivers/ufs/core/ufs-sysfs.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018 Western Digital Corporation
+ */
+
+#ifndef __UFS_SYSFS_H__
+#define __UFS_SYSFS_H__
+
+#include <linux/sysfs.h>
+
+struct device;
+
+void ufs_sysfs_add_nodes(struct device *dev);
+void ufs_sysfs_remove_nodes(struct device *dev);
+
+extern const struct attribute_group ufs_sysfs_unit_descriptor_group;
+extern const struct attribute_group ufs_sysfs_lun_attributes_group;
+
+#endif
diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
new file mode 100644
index 000000000000..b99e3f3dc4ef
--- /dev/null
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * bsg endpoint that supports UPIUs
+ *
+ * Copyright (C) 2018 Western Digital Corporation
+ */
+
+#include <linux/bsg-lib.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include "ufs_bsg.h"
+#include <ufs/ufshcd.h>
+#include "ufshcd-priv.h"
+
+static int ufs_bsg_get_query_desc_size(struct ufs_hba *hba, int *desc_len,
+				       struct utp_upiu_query *qr)
+{
+	int desc_size = be16_to_cpu(qr->length);
+	int desc_id = qr->idn;
+
+	if (desc_size <= 0)
+		return -EINVAL;
+
+	ufshcd_map_desc_id_to_length(hba, desc_id, desc_len);
+	if (!*desc_len)
+		return -EINVAL;
+
+	*desc_len = min_t(int, *desc_len, desc_size);
+
+	return 0;
+}
+
+static int ufs_bsg_verify_query_size(struct ufs_hba *hba,
+				     unsigned int request_len,
+				     unsigned int reply_len)
+{
+	int min_req_len = sizeof(struct ufs_bsg_request);
+	int min_rsp_len = sizeof(struct ufs_bsg_reply);
+
+	if (min_req_len > request_len || min_rsp_len > reply_len) {
+		dev_err(hba->dev, "not enough space assigned\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
+				     uint8_t **desc_buff, int *desc_len,
+				     enum query_opcode desc_op)
+{
+	struct ufs_bsg_request *bsg_request = job->request;
+	struct utp_upiu_query *qr;
+	u8 *descp;
+
+	if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC &&
+	    desc_op != UPIU_QUERY_OPCODE_READ_DESC)
+		goto out;
+
+	qr = &bsg_request->upiu_req.qr;
+	if (ufs_bsg_get_query_desc_size(hba, desc_len, qr)) {
+		dev_err(hba->dev, "Illegal desc size\n");
+		return -EINVAL;
+	}
+
+	if (*desc_len > job->request_payload.payload_len) {
+		dev_err(hba->dev, "Illegal desc size\n");
+		return -EINVAL;
+	}
+
+	descp = kzalloc(*desc_len, GFP_KERNEL);
+	if (!descp)
+		return -ENOMEM;
+
+	if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC)
+		sg_copy_to_buffer(job->request_payload.sg_list,
+				  job->request_payload.sg_cnt, descp,
+				  *desc_len);
+
+	*desc_buff = descp;
+
+out:
+	return 0;
+}
+
+static int ufs_bsg_request(struct bsg_job *job)
+{
+	struct ufs_bsg_request *bsg_request = job->request;
+	struct ufs_bsg_reply *bsg_reply = job->reply;
+	struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent));
+	unsigned int req_len = job->request_len;
+	unsigned int reply_len = job->reply_len;
+	struct uic_command uc = {};
+	int msgcode;
+	uint8_t *desc_buff = NULL;
+	int desc_len = 0;
+	enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP;
+	int ret;
+
+	ret = ufs_bsg_verify_query_size(hba, req_len, reply_len);
+	if (ret)
+		goto out;
+
+	bsg_reply->reply_payload_rcv_len = 0;
+
+	ufshcd_rpm_get_sync(hba);
+
+	msgcode = bsg_request->msgcode;
+	switch (msgcode) {
+	case UPIU_TRANSACTION_QUERY_REQ:
+		desc_op = bsg_request->upiu_req.qr.opcode;
+		ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
+						&desc_len, desc_op);
+		if (ret) {
+			ufshcd_rpm_put_sync(hba);
+			goto out;
+		}
+
+		fallthrough;
+	case UPIU_TRANSACTION_NOP_OUT:
+	case UPIU_TRANSACTION_TASK_REQ:
+		ret = ufshcd_exec_raw_upiu_cmd(hba, &bsg_request->upiu_req,
+					       &bsg_reply->upiu_rsp, msgcode,
+					       desc_buff, &desc_len, desc_op);
+		if (ret)
+			dev_err(hba->dev,
+				"exe raw upiu: error code %d\n", ret);
+
+		break;
+	case UPIU_TRANSACTION_UIC_CMD:
+		memcpy(&uc, &bsg_request->upiu_req.uc, UIC_CMD_SIZE);
+		ret = ufshcd_send_uic_cmd(hba, &uc);
+		if (ret)
+			dev_err(hba->dev,
+				"send uic cmd: error code %d\n", ret);
+
+		memcpy(&bsg_reply->upiu_rsp.uc, &uc, UIC_CMD_SIZE);
+
+		break;
+	default:
+		ret = -ENOTSUPP;
+		dev_err(hba->dev, "unsupported msgcode 0x%x\n", msgcode);
+
+		break;
+	}
+
+	ufshcd_rpm_put_sync(hba);
+
+	if (!desc_buff)
+		goto out;
+
+	if (desc_op == UPIU_QUERY_OPCODE_READ_DESC && desc_len)
+		bsg_reply->reply_payload_rcv_len =
+			sg_copy_from_buffer(job->request_payload.sg_list,
+					    job->request_payload.sg_cnt,
+					    desc_buff, desc_len);
+
+	kfree(desc_buff);
+
+out:
+	bsg_reply->result = ret;
+	job->reply_len = sizeof(struct ufs_bsg_reply);
+	/* complete the job here only if no error */
+	if (ret == 0)
+		bsg_job_done(job, ret, bsg_reply->reply_payload_rcv_len);
+
+	return ret;
+}
+
+/**
+ * ufs_bsg_remove - detach and remove the added ufs-bsg node
+ * @hba: per adapter object
+ *
+ * Should be called when unloading the driver.
+ */
+void ufs_bsg_remove(struct ufs_hba *hba)
+{
+	struct device *bsg_dev = &hba->bsg_dev;
+
+	if (!hba->bsg_queue)
+		return;
+
+	bsg_remove_queue(hba->bsg_queue);
+
+	device_del(bsg_dev);
+	put_device(bsg_dev);
+}
+
+static inline void ufs_bsg_node_release(struct device *dev)
+{
+	put_device(dev->parent);
+}
+
+/**
+ * ufs_bsg_probe - Add ufs bsg device node
+ * @hba: per adapter object
+ *
+ * Called during initial loading of the driver, and before scsi_scan_host.
+ */
+int ufs_bsg_probe(struct ufs_hba *hba)
+{
+	struct device *bsg_dev = &hba->bsg_dev;
+	struct Scsi_Host *shost = hba->host;
+	struct device *parent = &shost->shost_gendev;
+	struct request_queue *q;
+	int ret;
+
+	device_initialize(bsg_dev);
+
+	bsg_dev->parent = get_device(parent);
+	bsg_dev->release = ufs_bsg_node_release;
+
+	dev_set_name(bsg_dev, "ufs-bsg%u", shost->host_no);
+
+	ret = device_add(bsg_dev);
+	if (ret)
+		goto out;
+
+	q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), ufs_bsg_request, NULL, 0);
+	if (IS_ERR(q)) {
+		ret = PTR_ERR(q);
+		goto out;
+	}
+
+	hba->bsg_queue = q;
+
+	return 0;
+
+out:
+	dev_err(bsg_dev, "fail to initialize a bsg dev %d\n", shost->host_no);
+	put_device(bsg_dev);
+	return ret;
+}
diff --git a/drivers/ufs/core/ufs_bsg.h b/drivers/ufs/core/ufs_bsg.h
new file mode 100644
index 000000000000..57712d2656d2
--- /dev/null
+++ b/drivers/ufs/core/ufs_bsg.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Western Digital Corporation
+ */
+#ifndef UFS_BSG_H
+#define UFS_BSG_H
+
+struct ufs_hba;
+
+#ifdef CONFIG_SCSI_UFS_BSG
+void ufs_bsg_remove(struct ufs_hba *hba);
+int ufs_bsg_probe(struct ufs_hba *hba);
+#else
+static inline void ufs_bsg_remove(struct ufs_hba *hba) {}
+static inline int ufs_bsg_probe(struct ufs_hba *hba) {return 0; }
+#endif
+
+#endif /* UFS_BSG_H */
diff --git a/drivers/ufs/core/ufshcd-crypto.c b/drivers/ufs/core/ufshcd-crypto.c
new file mode 100644
index 000000000000..198360fe5e8e
--- /dev/null
+++ b/drivers/ufs/core/ufshcd-crypto.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <ufs/ufshcd.h>
+#include "ufshcd-crypto.h"
+
+/* Blk-crypto modes supported by UFS crypto */
+static const struct ufs_crypto_alg_entry {
+	enum ufs_crypto_alg ufs_alg;
+	enum ufs_crypto_key_size ufs_key_size;
+} ufs_crypto_algs[BLK_ENCRYPTION_MODE_MAX] = {
+	[BLK_ENCRYPTION_MODE_AES_256_XTS] = {
+		.ufs_alg = UFS_CRYPTO_ALG_AES_XTS,
+		.ufs_key_size = UFS_CRYPTO_KEY_SIZE_256,
+	},
+};
+
+static int ufshcd_program_key(struct ufs_hba *hba,
+			      const union ufs_crypto_cfg_entry *cfg, int slot)
+{
+	int i;
+	u32 slot_offset = hba->crypto_cfg_register + slot * sizeof(*cfg);
+	int err = 0;
+
+	ufshcd_hold(hba, false);
+
+	if (hba->vops && hba->vops->program_key) {
+		err = hba->vops->program_key(hba, cfg, slot);
+		goto out;
+	}
+
+	/* Ensure that CFGE is cleared before programming the key */
+	ufshcd_writel(hba, 0, slot_offset + 16 * sizeof(cfg->reg_val[0]));
+	for (i = 0; i < 16; i++) {
+		ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[i]),
+			      slot_offset + i * sizeof(cfg->reg_val[0]));
+	}
+	/* Write dword 17 */
+	ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[17]),
+		      slot_offset + 17 * sizeof(cfg->reg_val[0]));
+	/* Dword 16 must be written last */
+	ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[16]),
+		      slot_offset + 16 * sizeof(cfg->reg_val[0]));
+out:
+	ufshcd_release(hba);
+	return err;
+}
+
+static int ufshcd_crypto_keyslot_program(struct blk_crypto_profile *profile,
+					 const struct blk_crypto_key *key,
+					 unsigned int slot)
+{
+	struct ufs_hba *hba =
+		container_of(profile, struct ufs_hba, crypto_profile);
+	const union ufs_crypto_cap_entry *ccap_array = hba->crypto_cap_array;
+	const struct ufs_crypto_alg_entry *alg =
+			&ufs_crypto_algs[key->crypto_cfg.crypto_mode];
+	u8 data_unit_mask = key->crypto_cfg.data_unit_size / 512;
+	int i;
+	int cap_idx = -1;
+	union ufs_crypto_cfg_entry cfg = {};
+	int err;
+
+	BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0);
+	for (i = 0; i < hba->crypto_capabilities.num_crypto_cap; i++) {
+		if (ccap_array[i].algorithm_id == alg->ufs_alg &&
+		    ccap_array[i].key_size == alg->ufs_key_size &&
+		    (ccap_array[i].sdus_mask & data_unit_mask)) {
+			cap_idx = i;
+			break;
+		}
+	}
+
+	if (WARN_ON(cap_idx < 0))
+		return -EOPNOTSUPP;
+
+	cfg.data_unit_size = data_unit_mask;
+	cfg.crypto_cap_idx = cap_idx;
+	cfg.config_enable = UFS_CRYPTO_CONFIGURATION_ENABLE;
+
+	if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) {
+		/* In XTS mode, the blk_crypto_key's size is already doubled */
+		memcpy(cfg.crypto_key, key->raw, key->size/2);
+		memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE/2,
+		       key->raw + key->size/2, key->size/2);
+	} else {
+		memcpy(cfg.crypto_key, key->raw, key->size);
+	}
+
+	err = ufshcd_program_key(hba, &cfg, slot);
+
+	memzero_explicit(&cfg, sizeof(cfg));
+	return err;
+}
+
+static int ufshcd_clear_keyslot(struct ufs_hba *hba, int slot)
+{
+	/*
+	 * Clear the crypto cfg on the device. Clearing CFGE
+	 * might not be sufficient, so just clear the entire cfg.
+	 */
+	union ufs_crypto_cfg_entry cfg = {};
+
+	return ufshcd_program_key(hba, &cfg, slot);
+}
+
+static int ufshcd_crypto_keyslot_evict(struct blk_crypto_profile *profile,
+				       const struct blk_crypto_key *key,
+				       unsigned int slot)
+{
+	struct ufs_hba *hba =
+		container_of(profile, struct ufs_hba, crypto_profile);
+
+	return ufshcd_clear_keyslot(hba, slot);
+}
+
+bool ufshcd_crypto_enable(struct ufs_hba *hba)
+{
+	if (!(hba->caps & UFSHCD_CAP_CRYPTO))
+		return false;
+
+	/* Reset might clear all keys, so reprogram all the keys. */
+	blk_crypto_reprogram_all_keys(&hba->crypto_profile);
+	return true;
+}
+
+static const struct blk_crypto_ll_ops ufshcd_crypto_ops = {
+	.keyslot_program	= ufshcd_crypto_keyslot_program,
+	.keyslot_evict		= ufshcd_crypto_keyslot_evict,
+};
+
+static enum blk_crypto_mode_num
+ufshcd_find_blk_crypto_mode(union ufs_crypto_cap_entry cap)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ufs_crypto_algs); i++) {
+		BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0);
+		if (ufs_crypto_algs[i].ufs_alg == cap.algorithm_id &&
+		    ufs_crypto_algs[i].ufs_key_size == cap.key_size) {
+			return i;
+		}
+	}
+	return BLK_ENCRYPTION_MODE_INVALID;
+}
+
+/**
+ * ufshcd_hba_init_crypto_capabilities - Read crypto capabilities, init crypto
+ *					 fields in hba
+ * @hba: Per adapter instance
+ *
+ * Return: 0 if crypto was initialized or is not supported, else a -errno value.
+ */
+int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba)
+{
+	int cap_idx;
+	int err = 0;
+	enum blk_crypto_mode_num blk_mode_num;
+
+	/*
+	 * Don't use crypto if either the hardware doesn't advertise the
+	 * standard crypto capability bit *or* if the vendor specific driver
+	 * hasn't advertised that crypto is supported.
+	 */
+	if (!(hba->capabilities & MASK_CRYPTO_SUPPORT) ||
+	    !(hba->caps & UFSHCD_CAP_CRYPTO))
+		goto out;
+
+	hba->crypto_capabilities.reg_val =
+			cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP));
+	hba->crypto_cfg_register =
+		(u32)hba->crypto_capabilities.config_array_ptr * 0x100;
+	hba->crypto_cap_array =
+		devm_kcalloc(hba->dev, hba->crypto_capabilities.num_crypto_cap,
+			     sizeof(hba->crypto_cap_array[0]), GFP_KERNEL);
+	if (!hba->crypto_cap_array) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* The actual number of configurations supported is (CFGC+1) */
+	err = devm_blk_crypto_profile_init(
+			hba->dev, &hba->crypto_profile,
+			hba->crypto_capabilities.config_count + 1);
+	if (err)
+		goto out;
+
+	hba->crypto_profile.ll_ops = ufshcd_crypto_ops;
+	/* UFS only supports 8 bytes for any DUN */
+	hba->crypto_profile.max_dun_bytes_supported = 8;
+	hba->crypto_profile.dev = hba->dev;
+
+	/*
+	 * Cache all the UFS crypto capabilities and advertise the supported
+	 * crypto modes and data unit sizes to the block layer.
+	 */
+	for (cap_idx = 0; cap_idx < hba->crypto_capabilities.num_crypto_cap;
+	     cap_idx++) {
+		hba->crypto_cap_array[cap_idx].reg_val =
+			cpu_to_le32(ufshcd_readl(hba,
+						 REG_UFS_CRYPTOCAP +
+						 cap_idx * sizeof(__le32)));
+		blk_mode_num = ufshcd_find_blk_crypto_mode(
+						hba->crypto_cap_array[cap_idx]);
+		if (blk_mode_num != BLK_ENCRYPTION_MODE_INVALID)
+			hba->crypto_profile.modes_supported[blk_mode_num] |=
+				hba->crypto_cap_array[cap_idx].sdus_mask * 512;
+	}
+
+	return 0;
+
+out:
+	/* Indicate that init failed by clearing UFSHCD_CAP_CRYPTO */
+	hba->caps &= ~UFSHCD_CAP_CRYPTO;
+	return err;
+}
+
+/**
+ * ufshcd_init_crypto - Initialize crypto hardware
+ * @hba: Per adapter instance
+ */
+void ufshcd_init_crypto(struct ufs_hba *hba)
+{
+	int slot;
+
+	if (!(hba->caps & UFSHCD_CAP_CRYPTO))
+		return;
+
+	/* Clear all keyslots - the number of keyslots is (CFGC + 1) */
+	for (slot = 0; slot < hba->crypto_capabilities.config_count + 1; slot++)
+		ufshcd_clear_keyslot(hba, slot);
+}
+
+void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q)
+{
+	if (hba->caps & UFSHCD_CAP_CRYPTO)
+		blk_crypto_register(&hba->crypto_profile, q);
+}
diff --git a/drivers/ufs/core/ufshcd-crypto.h b/drivers/ufs/core/ufshcd-crypto.h
new file mode 100644
index 000000000000..504cc841540b
--- /dev/null
+++ b/drivers/ufs/core/ufshcd-crypto.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#ifndef _UFSHCD_CRYPTO_H
+#define _UFSHCD_CRYPTO_H
+
+#include <scsi/scsi_cmnd.h>
+#include <ufs/ufshcd.h>
+#include "ufshcd-priv.h"
+#include <ufs/ufshci.h>
+
+#ifdef CONFIG_SCSI_UFS_CRYPTO
+
+static inline void ufshcd_prepare_lrbp_crypto(struct request *rq,
+					      struct ufshcd_lrb *lrbp)
+{
+	if (!rq || !rq->crypt_keyslot) {
+		lrbp->crypto_key_slot = -1;
+		return;
+	}
+
+	lrbp->crypto_key_slot = blk_crypto_keyslot_index(rq->crypt_keyslot);
+	lrbp->data_unit_num = rq->crypt_ctx->bc_dun[0];
+}
+
+static inline void
+ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp, u32 *dword_0,
+				   u32 *dword_1, u32 *dword_3)
+{
+	if (lrbp->crypto_key_slot >= 0) {
+		*dword_0 |= UTP_REQ_DESC_CRYPTO_ENABLE_CMD;
+		*dword_0 |= lrbp->crypto_key_slot;
+		*dword_1 = lower_32_bits(lrbp->data_unit_num);
+		*dword_3 = upper_32_bits(lrbp->data_unit_num);
+	}
+}
+
+bool ufshcd_crypto_enable(struct ufs_hba *hba);
+
+int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba);
+
+void ufshcd_init_crypto(struct ufs_hba *hba);
+
+void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q);
+
+#else /* CONFIG_SCSI_UFS_CRYPTO */
+
+static inline void ufshcd_prepare_lrbp_crypto(struct request *rq,
+					      struct ufshcd_lrb *lrbp) { }
+
+static inline void
+ufshcd_prepare_req_desc_hdr_crypto(struct ufshcd_lrb *lrbp, u32 *dword_0,
+				   u32 *dword_1, u32 *dword_3) { }
+
+static inline bool ufshcd_crypto_enable(struct ufs_hba *hba)
+{
+	return false;
+}
+
+static inline int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba)
+{
+	return 0;
+}
+
+static inline void ufshcd_init_crypto(struct ufs_hba *hba) { }
+
+static inline void ufshcd_crypto_register(struct ufs_hba *hba,
+					  struct request_queue *q) { }
+
+#endif /* CONFIG_SCSI_UFS_CRYPTO */
+
+#endif /* _UFSHCD_CRYPTO_H */
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
new file mode 100644
index 000000000000..ffb01fc6de75
--- /dev/null
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -0,0 +1,298 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _UFSHCD_PRIV_H_
+#define _UFSHCD_PRIV_H_
+
+#include <linux/pm_runtime.h>
+#include <ufs/ufshcd.h>
+
+static inline bool ufshcd_is_user_access_allowed(struct ufs_hba *hba)
+{
+	return !hba->shutting_down;
+}
+
+void ufshcd_schedule_eh_work(struct ufs_hba *hba);
+
+static inline bool ufshcd_keep_autobkops_enabled_except_suspend(
+							struct ufs_hba *hba)
+{
+	return hba->caps & UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND;
+}
+
+static inline u8 ufshcd_wb_get_query_index(struct ufs_hba *hba)
+{
+	if (hba->dev_info.wb_buffer_type == WB_BUF_MODE_LU_DEDICATED)
+		return hba->dev_info.wb_dedicated_lu;
+	return 0;
+}
+
+#ifdef CONFIG_SCSI_UFS_HWMON
+void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask);
+void ufs_hwmon_remove(struct ufs_hba *hba);
+void ufs_hwmon_notify_event(struct ufs_hba *hba, u8 ee_mask);
+#else
+static inline void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask) {}
+static inline void ufs_hwmon_remove(struct ufs_hba *hba) {}
+static inline void ufs_hwmon_notify_event(struct ufs_hba *hba, u8 ee_mask) {}
+#endif
+
+int ufshcd_read_desc_param(struct ufs_hba *hba,
+			   enum desc_idn desc_id,
+			   int desc_index,
+			   u8 param_offset,
+			   u8 *param_read_buf,
+			   u8 param_size);
+int ufshcd_query_attr_retry(struct ufs_hba *hba, enum query_opcode opcode,
+			    enum attr_idn idn, u8 index, u8 selector,
+			    u32 *attr_val);
+int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
+		      enum attr_idn idn, u8 index, u8 selector, u32 *attr_val);
+int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
+	enum flag_idn idn, u8 index, bool *flag_res);
+void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
+
+#define SD_ASCII_STD true
+#define SD_RAW false
+int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
+			    u8 **buf, bool ascii);
+
+int ufshcd_hold(struct ufs_hba *hba, bool async);
+void ufshcd_release(struct ufs_hba *hba);
+
+void ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id,
+				  int *desc_length);
+
+int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
+
+int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
+			     struct utp_upiu_req *req_upiu,
+			     struct utp_upiu_req *rsp_upiu,
+			     int msgcode,
+			     u8 *desc_buff, int *buff_len,
+			     enum query_opcode desc_op);
+
+int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
+
+/* Wrapper functions for safely calling variant operations */
+static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
+{
+	if (hba->vops)
+		return hba->vops->name;
+	return "";
+}
+
+static inline void ufshcd_vops_exit(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->exit)
+		return hba->vops->exit(hba);
+}
+
+static inline u32 ufshcd_vops_get_ufs_hci_version(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->get_ufs_hci_version)
+		return hba->vops->get_ufs_hci_version(hba);
+
+	return ufshcd_readl(hba, REG_UFS_VERSION);
+}
+
+static inline int ufshcd_vops_clk_scale_notify(struct ufs_hba *hba,
+			bool up, enum ufs_notify_change_status status)
+{
+	if (hba->vops && hba->vops->clk_scale_notify)
+		return hba->vops->clk_scale_notify(hba, up, status);
+	return 0;
+}
+
+static inline void ufshcd_vops_event_notify(struct ufs_hba *hba,
+					    enum ufs_event_type evt,
+					    void *data)
+{
+	if (hba->vops && hba->vops->event_notify)
+		hba->vops->event_notify(hba, evt, data);
+}
+
+static inline int ufshcd_vops_setup_clocks(struct ufs_hba *hba, bool on,
+					enum ufs_notify_change_status status)
+{
+	if (hba->vops && hba->vops->setup_clocks)
+		return hba->vops->setup_clocks(hba, on, status);
+	return 0;
+}
+
+static inline int ufshcd_vops_hce_enable_notify(struct ufs_hba *hba,
+						bool status)
+{
+	if (hba->vops && hba->vops->hce_enable_notify)
+		return hba->vops->hce_enable_notify(hba, status);
+
+	return 0;
+}
+static inline int ufshcd_vops_link_startup_notify(struct ufs_hba *hba,
+						bool status)
+{
+	if (hba->vops && hba->vops->link_startup_notify)
+		return hba->vops->link_startup_notify(hba, status);
+
+	return 0;
+}
+
+static inline int ufshcd_vops_pwr_change_notify(struct ufs_hba *hba,
+				  enum ufs_notify_change_status status,
+				  struct ufs_pa_layer_attr *dev_max_params,
+				  struct ufs_pa_layer_attr *dev_req_params)
+{
+	if (hba->vops && hba->vops->pwr_change_notify)
+		return hba->vops->pwr_change_notify(hba, status,
+					dev_max_params, dev_req_params);
+
+	return -ENOTSUPP;
+}
+
+static inline void ufshcd_vops_setup_task_mgmt(struct ufs_hba *hba,
+					int tag, u8 tm_function)
+{
+	if (hba->vops && hba->vops->setup_task_mgmt)
+		return hba->vops->setup_task_mgmt(hba, tag, tm_function);
+}
+
+static inline void ufshcd_vops_hibern8_notify(struct ufs_hba *hba,
+					enum uic_cmd_dme cmd,
+					enum ufs_notify_change_status status)
+{
+	if (hba->vops && hba->vops->hibern8_notify)
+		return hba->vops->hibern8_notify(hba, cmd, status);
+}
+
+static inline int ufshcd_vops_apply_dev_quirks(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->apply_dev_quirks)
+		return hba->vops->apply_dev_quirks(hba);
+	return 0;
+}
+
+static inline void ufshcd_vops_fixup_dev_quirks(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->fixup_dev_quirks)
+		hba->vops->fixup_dev_quirks(hba);
+}
+
+static inline int ufshcd_vops_suspend(struct ufs_hba *hba, enum ufs_pm_op op,
+				enum ufs_notify_change_status status)
+{
+	if (hba->vops && hba->vops->suspend)
+		return hba->vops->suspend(hba, op, status);
+
+	return 0;
+}
+
+static inline int ufshcd_vops_resume(struct ufs_hba *hba, enum ufs_pm_op op)
+{
+	if (hba->vops && hba->vops->resume)
+		return hba->vops->resume(hba, op);
+
+	return 0;
+}
+
+static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->dbg_register_dump)
+		hba->vops->dbg_register_dump(hba);
+}
+
+static inline int ufshcd_vops_device_reset(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->device_reset)
+		return hba->vops->device_reset(hba);
+
+	return -EOPNOTSUPP;
+}
+
+static inline void ufshcd_vops_config_scaling_param(struct ufs_hba *hba,
+		struct devfreq_dev_profile *p,
+		struct devfreq_simple_ondemand_data *data)
+{
+	if (hba->vops && hba->vops->config_scaling_param)
+		hba->vops->config_scaling_param(hba, p, data);
+}
+
+extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
+
+/**
+ * ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
+ * @scsi_lun: scsi LUN id
+ *
+ * Returns UPIU LUN id
+ */
+static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
+{
+	if (scsi_is_wlun(scsi_lun))
+		return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
+			| UFS_UPIU_WLUN_ID;
+	else
+		return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
+}
+
+int __ufshcd_write_ee_control(struct ufs_hba *hba, u32 ee_ctrl_mask);
+int ufshcd_write_ee_control(struct ufs_hba *hba);
+int ufshcd_update_ee_control(struct ufs_hba *hba, u16 *mask, u16 *other_mask,
+			     u16 set, u16 clr);
+
+static inline int ufshcd_update_ee_drv_mask(struct ufs_hba *hba,
+					    u16 set, u16 clr)
+{
+	return ufshcd_update_ee_control(hba, &hba->ee_drv_mask,
+					&hba->ee_usr_mask, set, clr);
+}
+
+static inline int ufshcd_update_ee_usr_mask(struct ufs_hba *hba,
+					    u16 set, u16 clr)
+{
+	return ufshcd_update_ee_control(hba, &hba->ee_usr_mask,
+					&hba->ee_drv_mask, set, clr);
+}
+
+static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
+{
+	return pm_runtime_get_sync(&hba->ufs_device_wlun->sdev_gendev);
+}
+
+static inline int ufshcd_rpm_put_sync(struct ufs_hba *hba)
+{
+	return pm_runtime_put_sync(&hba->ufs_device_wlun->sdev_gendev);
+}
+
+static inline void ufshcd_rpm_get_noresume(struct ufs_hba *hba)
+{
+	pm_runtime_get_noresume(&hba->ufs_device_wlun->sdev_gendev);
+}
+
+static inline int ufshcd_rpm_resume(struct ufs_hba *hba)
+{
+	return pm_runtime_resume(&hba->ufs_device_wlun->sdev_gendev);
+}
+
+static inline int ufshcd_rpm_put(struct ufs_hba *hba)
+{
+	return pm_runtime_put(&hba->ufs_device_wlun->sdev_gendev);
+}
+
+/**
+ * ufs_is_valid_unit_desc_lun - checks if the given LUN has a unit descriptor
+ * @dev_info: pointer of instance of struct ufs_dev_info
+ * @lun: LU number to check
+ * @return: true if the lun has a matching unit descriptor, false otherwise
+ */
+static inline bool ufs_is_valid_unit_desc_lun(struct ufs_dev_info *dev_info,
+		u8 lun, u8 param_offset)
+{
+	if (!dev_info || !dev_info->max_lu_supported) {
+		pr_err("Max General LU supported by UFS isn't initialized\n");
+		return false;
+	}
+	/* WB is available only for the logical unit from 0 to 7 */
+	if (param_offset == UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS)
+		return lun < UFS_UPIU_MAX_WB_LUN_ID;
+	return lun == UFS_UPIU_RPMB_WLUN || (lun < dev_info->max_lu_supported);
+}
+
+#endif /* _UFSHCD_PRIV_H_ */
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
new file mode 100644
index 000000000000..efe67a381c32
--- /dev/null
+++ b/drivers/ufs/core/ufshcd.c
@@ -0,0 +1,9944 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Universal Flash Storage Host controller driver Core
+ * Copyright (C) 2011-2013 Samsung India Software Operations
+ * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
+ *
+ * Authors:
+ *	Santosh Yaraganavi <santosh.sy@samsung.com>
+ *	Vinayak Holikatti <h.vinayak@samsung.com>
+ */
+
+#include <linux/async.h>
+#include <linux/devfreq.h>
+#include <linux/nls.h>
+#include <linux/of.h>
+#include <linux/bitfield.h>
+#include <linux/blk-pm.h>
+#include <linux/blkdev.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_eh.h>
+#include "ufshcd-priv.h"
+#include <ufs/ufs_quirks.h>
+#include <ufs/unipro.h>
+#include "ufs-sysfs.h"
+#include "ufs-debugfs.h"
+#include "ufs-fault-injection.h"
+#include "ufs_bsg.h"
+#include "ufshcd-crypto.h"
+#include "ufshpb.h"
+#include <asm/unaligned.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/ufs.h>
+
+#define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
+				 UTP_TASK_REQ_COMPL |\
+				 UFSHCD_ERROR_MASK)
+/* UIC command timeout, unit: ms */
+#define UIC_CMD_TIMEOUT	500
+
+/* NOP OUT retries waiting for NOP IN response */
+#define NOP_OUT_RETRIES    10
+/* Timeout after 50 msecs if NOP OUT hangs without response */
+#define NOP_OUT_TIMEOUT    50 /* msecs */
+
+/* Query request retries */
+#define QUERY_REQ_RETRIES 3
+/* Query request timeout */
+#define QUERY_REQ_TIMEOUT 1500 /* 1.5 seconds */
+
+/* Task management command timeout */
+#define TM_CMD_TIMEOUT	100 /* msecs */
+
+/* maximum number of retries for a general UIC command  */
+#define UFS_UIC_COMMAND_RETRIES 3
+
+/* maximum number of link-startup retries */
+#define DME_LINKSTARTUP_RETRIES 3
+
+/* Maximum retries for Hibern8 enter */
+#define UIC_HIBERN8_ENTER_RETRIES 3
+
+/* maximum number of reset retries before giving up */
+#define MAX_HOST_RESET_RETRIES 5
+
+/* Maximum number of error handler retries before giving up */
+#define MAX_ERR_HANDLER_RETRIES 5
+
+/* Expose the flag value from utp_upiu_query.value */
+#define MASK_QUERY_UPIU_FLAG_LOC 0xFF
+
+/* Interrupt aggregation default timeout, unit: 40us */
+#define INT_AGGR_DEF_TO	0x02
+
+/* default delay of autosuspend: 2000 ms */
+#define RPM_AUTOSUSPEND_DELAY_MS 2000
+
+/* Default delay of RPM device flush delayed work */
+#define RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS 5000
+
+/* Default value of wait time before gating device ref clock */
+#define UFSHCD_REF_CLK_GATING_WAIT_US 0xFF /* microsecs */
+
+/* Polling time to wait for fDeviceInit */
+#define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
+
+#define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
+	({                                                              \
+		int _ret;                                               \
+		if (_on)                                                \
+			_ret = ufshcd_enable_vreg(_dev, _vreg);         \
+		else                                                    \
+			_ret = ufshcd_disable_vreg(_dev, _vreg);        \
+		_ret;                                                   \
+	})
+
+#define ufshcd_hex_dump(prefix_str, buf, len) do {                       \
+	size_t __len = (len);                                            \
+	print_hex_dump(KERN_ERR, prefix_str,                             \
+		       __len > 4 ? DUMP_PREFIX_OFFSET : DUMP_PREFIX_NONE,\
+		       16, 4, buf, __len, false);                        \
+} while (0)
+
+int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
+		     const char *prefix)
+{
+	u32 *regs;
+	size_t pos;
+
+	if (offset % 4 != 0 || len % 4 != 0) /* keep readl happy */
+		return -EINVAL;
+
+	regs = kzalloc(len, GFP_ATOMIC);
+	if (!regs)
+		return -ENOMEM;
+
+	for (pos = 0; pos < len; pos += 4) {
+		if (offset == 0 &&
+		    pos >= REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER &&
+		    pos <= REG_UIC_ERROR_CODE_DME)
+			continue;
+		regs[pos / 4] = ufshcd_readl(hba, offset + pos);
+	}
+
+	ufshcd_hex_dump(prefix, regs, len);
+	kfree(regs);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dump_regs);
+
+enum {
+	UFSHCD_MAX_CHANNEL	= 0,
+	UFSHCD_MAX_ID		= 1,
+	UFSHCD_NUM_RESERVED	= 1,
+	UFSHCD_CMD_PER_LUN	= 32 - UFSHCD_NUM_RESERVED,
+	UFSHCD_CAN_QUEUE	= 32 - UFSHCD_NUM_RESERVED,
+};
+
+static const char *const ufshcd_state_name[] = {
+	[UFSHCD_STATE_RESET]			= "reset",
+	[UFSHCD_STATE_OPERATIONAL]		= "operational",
+	[UFSHCD_STATE_ERROR]			= "error",
+	[UFSHCD_STATE_EH_SCHEDULED_FATAL]	= "eh_fatal",
+	[UFSHCD_STATE_EH_SCHEDULED_NON_FATAL]	= "eh_non_fatal",
+};
+
+/* UFSHCD error handling flags */
+enum {
+	UFSHCD_EH_IN_PROGRESS = (1 << 0),
+};
+
+/* UFSHCD UIC layer error flags */
+enum {
+	UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
+	UFSHCD_UIC_DL_NAC_RECEIVED_ERROR = (1 << 1), /* Data link layer error */
+	UFSHCD_UIC_DL_TCx_REPLAY_ERROR = (1 << 2), /* Data link layer error */
+	UFSHCD_UIC_NL_ERROR = (1 << 3), /* Network layer error */
+	UFSHCD_UIC_TL_ERROR = (1 << 4), /* Transport Layer error */
+	UFSHCD_UIC_DME_ERROR = (1 << 5), /* DME error */
+	UFSHCD_UIC_PA_GENERIC_ERROR = (1 << 6), /* Generic PA error */
+};
+
+#define ufshcd_set_eh_in_progress(h) \
+	((h)->eh_flags |= UFSHCD_EH_IN_PROGRESS)
+#define ufshcd_eh_in_progress(h) \
+	((h)->eh_flags & UFSHCD_EH_IN_PROGRESS)
+#define ufshcd_clear_eh_in_progress(h) \
+	((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)
+
+struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
+	[UFS_PM_LVL_0] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
+	[UFS_PM_LVL_1] = {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
+	[UFS_PM_LVL_2] = {UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
+	[UFS_PM_LVL_3] = {UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
+	[UFS_PM_LVL_4] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
+	[UFS_PM_LVL_5] = {UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
+	/*
+	 * For DeepSleep, the link is first put in hibern8 and then off.
+	 * Leaving the link in hibern8 is not supported.
+	 */
+	[UFS_PM_LVL_6] = {UFS_DEEPSLEEP_PWR_MODE, UIC_LINK_OFF_STATE},
+};
+
+static inline enum ufs_dev_pwr_mode
+ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
+{
+	return ufs_pm_lvl_states[lvl].dev_state;
+}
+
+static inline enum uic_link_state
+ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
+{
+	return ufs_pm_lvl_states[lvl].link_state;
+}
+
+static inline enum ufs_pm_level
+ufs_get_desired_pm_lvl_for_dev_link_state(enum ufs_dev_pwr_mode dev_state,
+					enum uic_link_state link_state)
+{
+	enum ufs_pm_level lvl;
+
+	for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++) {
+		if ((ufs_pm_lvl_states[lvl].dev_state == dev_state) &&
+			(ufs_pm_lvl_states[lvl].link_state == link_state))
+			return lvl;
+	}
+
+	/* if no match found, return the level 0 */
+	return UFS_PM_LVL_0;
+}
+
+static const struct ufs_dev_quirk ufs_fixups[] = {
+	/* UFS cards deviations table */
+	{ .wmanufacturerid = UFS_VENDOR_MICRON,
+	  .model = UFS_ANY_MODEL,
+	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
+		   UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ },
+	{ .wmanufacturerid = UFS_VENDOR_SAMSUNG,
+	  .model = UFS_ANY_MODEL,
+	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
+		   UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE |
+		   UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS },
+	{ .wmanufacturerid = UFS_VENDOR_SKHYNIX,
+	  .model = UFS_ANY_MODEL,
+	  .quirk = UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME },
+	{ .wmanufacturerid = UFS_VENDOR_SKHYNIX,
+	  .model = "hB8aL1" /*H28U62301AMR*/,
+	  .quirk = UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME },
+	{ .wmanufacturerid = UFS_VENDOR_TOSHIBA,
+	  .model = UFS_ANY_MODEL,
+	  .quirk = UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM },
+	{ .wmanufacturerid = UFS_VENDOR_TOSHIBA,
+	  .model = "THGLF2G9C8KBADG",
+	  .quirk = UFS_DEVICE_QUIRK_PA_TACTIVATE },
+	{ .wmanufacturerid = UFS_VENDOR_TOSHIBA,
+	  .model = "THGLF2G9D8KBADG",
+	  .quirk = UFS_DEVICE_QUIRK_PA_TACTIVATE },
+	{}
+};
+
+static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba);
+static void ufshcd_async_scan(void *data, async_cookie_t cookie);
+static int ufshcd_reset_and_restore(struct ufs_hba *hba);
+static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
+static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
+static void ufshcd_hba_exit(struct ufs_hba *hba);
+static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params);
+static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
+static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
+static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
+static void ufshcd_resume_clkscaling(struct ufs_hba *hba);
+static void ufshcd_suspend_clkscaling(struct ufs_hba *hba);
+static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba);
+static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
+static irqreturn_t ufshcd_intr(int irq, void *__hba);
+static int ufshcd_change_power_mode(struct ufs_hba *hba,
+			     struct ufs_pa_layer_attr *pwr_mode);
+static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
+static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
+static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
+					 struct ufs_vreg *vreg);
+static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
+static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
+static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
+static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba);
+static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba);
+
+static inline void ufshcd_enable_irq(struct ufs_hba *hba)
+{
+	if (!hba->is_irq_enabled) {
+		enable_irq(hba->irq);
+		hba->is_irq_enabled = true;
+	}
+}
+
+static inline void ufshcd_disable_irq(struct ufs_hba *hba)
+{
+	if (hba->is_irq_enabled) {
+		disable_irq(hba->irq);
+		hba->is_irq_enabled = false;
+	}
+}
+
+static inline void ufshcd_wb_config(struct ufs_hba *hba)
+{
+	if (!ufshcd_is_wb_allowed(hba))
+		return;
+
+	ufshcd_wb_toggle(hba, true);
+
+	ufshcd_wb_toggle_flush_during_h8(hba, true);
+	if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
+		ufshcd_wb_toggle_flush(hba, true);
+}
+
+static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba)
+{
+	if (atomic_dec_and_test(&hba->scsi_block_reqs_cnt))
+		scsi_unblock_requests(hba->host);
+}
+
+static void ufshcd_scsi_block_requests(struct ufs_hba *hba)
+{
+	if (atomic_inc_return(&hba->scsi_block_reqs_cnt) == 1)
+		scsi_block_requests(hba->host);
+}
+
+static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
+				      enum ufs_trace_str_t str_t)
+{
+	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
+	struct utp_upiu_header *header;
+
+	if (!trace_ufshcd_upiu_enabled())
+		return;
+
+	if (str_t == UFS_CMD_SEND)
+		header = &rq->header;
+	else
+		header = &hba->lrb[tag].ucd_rsp_ptr->header;
+
+	trace_ufshcd_upiu(dev_name(hba->dev), str_t, header, &rq->sc.cdb,
+			  UFS_TSF_CDB);
+}
+
+static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba,
+					enum ufs_trace_str_t str_t,
+					struct utp_upiu_req *rq_rsp)
+{
+	if (!trace_ufshcd_upiu_enabled())
+		return;
+
+	trace_ufshcd_upiu(dev_name(hba->dev), str_t, &rq_rsp->header,
+			  &rq_rsp->qr, UFS_TSF_OSF);
+}
+
+static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
+				     enum ufs_trace_str_t str_t)
+{
+	struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[tag];
+
+	if (!trace_ufshcd_upiu_enabled())
+		return;
+
+	if (str_t == UFS_TM_SEND)
+		trace_ufshcd_upiu(dev_name(hba->dev), str_t,
+				  &descp->upiu_req.req_header,
+				  &descp->upiu_req.input_param1,
+				  UFS_TSF_TM_INPUT);
+	else
+		trace_ufshcd_upiu(dev_name(hba->dev), str_t,
+				  &descp->upiu_rsp.rsp_header,
+				  &descp->upiu_rsp.output_param1,
+				  UFS_TSF_TM_OUTPUT);
+}
+
+static void ufshcd_add_uic_command_trace(struct ufs_hba *hba,
+					 struct uic_command *ucmd,
+					 enum ufs_trace_str_t str_t)
+{
+	u32 cmd;
+
+	if (!trace_ufshcd_uic_command_enabled())
+		return;
+
+	if (str_t == UFS_CMD_SEND)
+		cmd = ucmd->command;
+	else
+		cmd = ufshcd_readl(hba, REG_UIC_COMMAND);
+
+	trace_ufshcd_uic_command(dev_name(hba->dev), str_t, cmd,
+				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_1),
+				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2),
+				 ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3));
+}
+
+static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
+				     enum ufs_trace_str_t str_t)
+{
+	u64 lba = 0;
+	u8 opcode = 0, group_id = 0;
+	u32 intr, doorbell;
+	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
+	struct scsi_cmnd *cmd = lrbp->cmd;
+	struct request *rq = scsi_cmd_to_rq(cmd);
+	int transfer_len = -1;
+
+	if (!cmd)
+		return;
+
+	/* trace UPIU also */
+	ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
+	if (!trace_ufshcd_command_enabled())
+		return;
+
+	opcode = cmd->cmnd[0];
+
+	if (opcode == READ_10 || opcode == WRITE_10) {
+		/*
+		 * Currently we only fully trace read(10) and write(10) commands
+		 */
+		transfer_len =
+		       be32_to_cpu(lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
+		lba = scsi_get_lba(cmd);
+		if (opcode == WRITE_10)
+			group_id = lrbp->cmd->cmnd[6];
+	} else if (opcode == UNMAP) {
+		/*
+		 * The number of Bytes to be unmapped beginning with the lba.
+		 */
+		transfer_len = blk_rq_bytes(rq);
+		lba = scsi_get_lba(cmd);
+	}
+
+	intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
+	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
+			doorbell, transfer_len, intr, lba, opcode, group_id);
+}
+
+static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
+{
+	struct ufs_clk_info *clki;
+	struct list_head *head = &hba->clk_list_head;
+
+	if (list_empty(head))
+		return;
+
+	list_for_each_entry(clki, head, list) {
+		if (!IS_ERR_OR_NULL(clki->clk) && clki->min_freq &&
+				clki->max_freq)
+			dev_err(hba->dev, "clk: %s, rate: %u\n",
+					clki->name, clki->curr_freq);
+	}
+}
+
+static void ufshcd_print_evt(struct ufs_hba *hba, u32 id,
+			     char *err_name)
+{
+	int i;
+	bool found = false;
+	struct ufs_event_hist *e;
+
+	if (id >= UFS_EVT_CNT)
+		return;
+
+	e = &hba->ufs_stats.event[id];
+
+	for (i = 0; i < UFS_EVENT_HIST_LENGTH; i++) {
+		int p = (i + e->pos) % UFS_EVENT_HIST_LENGTH;
+
+		if (e->tstamp[p] == 0)
+			continue;
+		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, p,
+			e->val[p], ktime_to_us(e->tstamp[p]));
+		found = true;
+	}
+
+	if (!found)
+		dev_err(hba->dev, "No record of %s\n", err_name);
+	else
+		dev_err(hba->dev, "%s: total cnt=%llu\n", err_name, e->cnt);
+}
+
+static void ufshcd_print_evt_hist(struct ufs_hba *hba)
+{
+	ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
+
+	ufshcd_print_evt(hba, UFS_EVT_PA_ERR, "pa_err");
+	ufshcd_print_evt(hba, UFS_EVT_DL_ERR, "dl_err");
+	ufshcd_print_evt(hba, UFS_EVT_NL_ERR, "nl_err");
+	ufshcd_print_evt(hba, UFS_EVT_TL_ERR, "tl_err");
+	ufshcd_print_evt(hba, UFS_EVT_DME_ERR, "dme_err");
+	ufshcd_print_evt(hba, UFS_EVT_AUTO_HIBERN8_ERR,
+			 "auto_hibern8_err");
+	ufshcd_print_evt(hba, UFS_EVT_FATAL_ERR, "fatal_err");
+	ufshcd_print_evt(hba, UFS_EVT_LINK_STARTUP_FAIL,
+			 "link_startup_fail");
+	ufshcd_print_evt(hba, UFS_EVT_RESUME_ERR, "resume_fail");
+	ufshcd_print_evt(hba, UFS_EVT_SUSPEND_ERR,
+			 "suspend_fail");
+	ufshcd_print_evt(hba, UFS_EVT_DEV_RESET, "dev_reset");
+	ufshcd_print_evt(hba, UFS_EVT_HOST_RESET, "host_reset");
+	ufshcd_print_evt(hba, UFS_EVT_ABORT, "task_abort");
+
+	ufshcd_vops_dbg_register_dump(hba);
+}
+
+static
+void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
+{
+	struct ufshcd_lrb *lrbp;
+	int prdt_length;
+	int tag;
+
+	for_each_set_bit(tag, &bitmap, hba->nutrs) {
+		lrbp = &hba->lrb[tag];
+
+		dev_err(hba->dev, "UPIU[%d] - issue time %lld us\n",
+				tag, ktime_to_us(lrbp->issue_time_stamp));
+		dev_err(hba->dev, "UPIU[%d] - complete time %lld us\n",
+				tag, ktime_to_us(lrbp->compl_time_stamp));
+		dev_err(hba->dev,
+			"UPIU[%d] - Transfer Request Descriptor phys@0x%llx\n",
+			tag, (u64)lrbp->utrd_dma_addr);
+
+		ufshcd_hex_dump("UPIU TRD: ", lrbp->utr_descriptor_ptr,
+				sizeof(struct utp_transfer_req_desc));
+		dev_err(hba->dev, "UPIU[%d] - Request UPIU phys@0x%llx\n", tag,
+			(u64)lrbp->ucd_req_dma_addr);
+		ufshcd_hex_dump("UPIU REQ: ", lrbp->ucd_req_ptr,
+				sizeof(struct utp_upiu_req));
+		dev_err(hba->dev, "UPIU[%d] - Response UPIU phys@0x%llx\n", tag,
+			(u64)lrbp->ucd_rsp_dma_addr);
+		ufshcd_hex_dump("UPIU RSP: ", lrbp->ucd_rsp_ptr,
+				sizeof(struct utp_upiu_rsp));
+
+		prdt_length = le16_to_cpu(
+			lrbp->utr_descriptor_ptr->prd_table_length);
+		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
+			prdt_length /= sizeof(struct ufshcd_sg_entry);
+
+		dev_err(hba->dev,
+			"UPIU[%d] - PRDT - %d entries  phys@0x%llx\n",
+			tag, prdt_length,
+			(u64)lrbp->ucd_prdt_dma_addr);
+
+		if (pr_prdt)
+			ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
+				sizeof(struct ufshcd_sg_entry) * prdt_length);
+	}
+}
+
+static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
+{
+	int tag;
+
+	for_each_set_bit(tag, &bitmap, hba->nutmrs) {
+		struct utp_task_req_desc *tmrdp = &hba->utmrdl_base_addr[tag];
+
+		dev_err(hba->dev, "TM[%d] - Task Management Header\n", tag);
+		ufshcd_hex_dump("", tmrdp, sizeof(*tmrdp));
+	}
+}
+
+static void ufshcd_print_host_state(struct ufs_hba *hba)
+{
+	struct scsi_device *sdev_ufs = hba->ufs_device_wlun;
+
+	dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
+	dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n",
+		hba->outstanding_reqs, hba->outstanding_tasks);
+	dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
+		hba->saved_err, hba->saved_uic_err);
+	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	dev_err(hba->dev, "PM in progress=%d, sys. suspended=%d\n",
+		hba->pm_op_in_progress, hba->is_sys_suspended);
+	dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
+		hba->auto_bkops_enabled, hba->host->host_self_blocked);
+	dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
+	dev_err(hba->dev,
+		"last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n",
+		ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
+		hba->ufs_stats.hibern8_exit_cnt);
+	dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n",
+		ktime_to_us(hba->ufs_stats.last_intr_ts),
+		hba->ufs_stats.last_intr_status);
+	dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n",
+		hba->eh_flags, hba->req_abort_count);
+	dev_err(hba->dev, "hba->ufs_version=0x%x, Host capabilities=0x%x, caps=0x%x\n",
+		hba->ufs_version, hba->capabilities, hba->caps);
+	dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks,
+		hba->dev_quirks);
+	if (sdev_ufs)
+		dev_err(hba->dev, "UFS dev info: %.8s %.16s rev %.4s\n",
+			sdev_ufs->vendor, sdev_ufs->model, sdev_ufs->rev);
+
+	ufshcd_print_clk_freqs(hba);
+}
+
+/**
+ * ufshcd_print_pwr_info - print power params as saved in hba
+ * power info
+ * @hba: per-adapter instance
+ */
+static void ufshcd_print_pwr_info(struct ufs_hba *hba)
+{
+	static const char * const names[] = {
+		"INVALID MODE",
+		"FAST MODE",
+		"SLOW_MODE",
+		"INVALID MODE",
+		"FASTAUTO_MODE",
+		"SLOWAUTO_MODE",
+		"INVALID MODE",
+	};
+
+	/*
+	 * Using dev_dbg to avoid messages during runtime PM to avoid
+	 * never-ending cycles of messages written back to storage by user space
+	 * causing runtime resume, causing more messages and so on.
+	 */
+	dev_dbg(hba->dev, "%s:[RX, TX]: gear=[%d, %d], lane[%d, %d], pwr[%s, %s], rate = %d\n",
+		 __func__,
+		 hba->pwr_info.gear_rx, hba->pwr_info.gear_tx,
+		 hba->pwr_info.lane_rx, hba->pwr_info.lane_tx,
+		 names[hba->pwr_info.pwr_rx],
+		 names[hba->pwr_info.pwr_tx],
+		 hba->pwr_info.hs_rate);
+}
+
+static void ufshcd_device_reset(struct ufs_hba *hba)
+{
+	int err;
+
+	err = ufshcd_vops_device_reset(hba);
+
+	if (!err) {
+		ufshcd_set_ufs_dev_active(hba);
+		if (ufshcd_is_wb_allowed(hba)) {
+			hba->dev_info.wb_enabled = false;
+			hba->dev_info.wb_buf_flush_enabled = false;
+		}
+	}
+	if (err != -EOPNOTSUPP)
+		ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, err);
+}
+
+void ufshcd_delay_us(unsigned long us, unsigned long tolerance)
+{
+	if (!us)
+		return;
+
+	if (us < 10)
+		udelay(us);
+	else
+		usleep_range(us, us + tolerance);
+}
+EXPORT_SYMBOL_GPL(ufshcd_delay_us);
+
+/**
+ * ufshcd_wait_for_register - wait for register value to change
+ * @hba: per-adapter interface
+ * @reg: mmio register offset
+ * @mask: mask to apply to the read register value
+ * @val: value to wait for
+ * @interval_us: polling interval in microseconds
+ * @timeout_ms: timeout in milliseconds
+ *
+ * Return:
+ * -ETIMEDOUT on error, zero on success.
+ */
+static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
+				u32 val, unsigned long interval_us,
+				unsigned long timeout_ms)
+{
+	int err = 0;
+	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
+
+	/* ignore bits that we don't intend to wait on */
+	val = val & mask;
+
+	while ((ufshcd_readl(hba, reg) & mask) != val) {
+		usleep_range(interval_us, interval_us + 50);
+		if (time_after(jiffies, timeout)) {
+			if ((ufshcd_readl(hba, reg) & mask) != val)
+				err = -ETIMEDOUT;
+			break;
+		}
+	}
+
+	return err;
+}
+
+/**
+ * ufshcd_get_intr_mask - Get the interrupt bit mask
+ * @hba: Pointer to adapter instance
+ *
+ * Returns interrupt bit mask per version
+ */
+static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
+{
+	if (hba->ufs_version == ufshci_version(1, 0))
+		return INTERRUPT_MASK_ALL_VER_10;
+	if (hba->ufs_version <= ufshci_version(2, 0))
+		return INTERRUPT_MASK_ALL_VER_11;
+
+	return INTERRUPT_MASK_ALL_VER_21;
+}
+
+/**
+ * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
+ * @hba: Pointer to adapter instance
+ *
+ * Returns UFSHCI version supported by the controller
+ */
+static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
+{
+	u32 ufshci_ver;
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION)
+		ufshci_ver = ufshcd_vops_get_ufs_hci_version(hba);
+	else
+		ufshci_ver = ufshcd_readl(hba, REG_UFS_VERSION);
+
+	/*
+	 * UFSHCI v1.x uses a different version scheme, in order
+	 * to allow the use of comparisons with the ufshci_version
+	 * function, we convert it to the same scheme as ufs 2.0+.
+	 */
+	if (ufshci_ver & 0x00010000)
+		return ufshci_version(1, ufshci_ver & 0x00000100);
+
+	return ufshci_ver;
+}
+
+/**
+ * ufshcd_is_device_present - Check if any device connected to
+ *			      the host controller
+ * @hba: pointer to adapter instance
+ *
+ * Returns true if device present, false if no device detected
+ */
+static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
+{
+	return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & DEVICE_PRESENT;
+}
+
+/**
+ * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
+ * @lrbp: pointer to local command reference block
+ *
+ * This function is used to get the OCS field from UTRD
+ * Returns the OCS field in the UTRD
+ */
+static enum utp_ocs ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
+{
+	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
+}
+
+/**
+ * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
+ * @hba: per adapter instance
+ * @pos: position of the bit to be cleared
+ */
+static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
+{
+	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
+		ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
+	else
+		ufshcd_writel(hba, ~(1 << pos),
+				REG_UTP_TRANSFER_REQ_LIST_CLEAR);
+}
+
+/**
+ * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
+ * @hba: per adapter instance
+ * @pos: position of the bit to be cleared
+ */
+static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
+{
+	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
+		ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
+	else
+		ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
+}
+
+/**
+ * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
+ * @reg: Register value of host controller status
+ *
+ * Returns integer, 0 on Success and positive value if failed
+ */
+static inline int ufshcd_get_lists_status(u32 reg)
+{
+	return !((reg & UFSHCD_STATUS_READY) == UFSHCD_STATUS_READY);
+}
+
+/**
+ * ufshcd_get_uic_cmd_result - Get the UIC command result
+ * @hba: Pointer to adapter instance
+ *
+ * This function gets the result of UIC command completion
+ * Returns 0 on success, non zero value on error
+ */
+static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
+{
+	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
+	       MASK_UIC_COMMAND_RESULT;
+}
+
+/**
+ * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
+ * @hba: Pointer to adapter instance
+ *
+ * This function gets UIC command argument3
+ * Returns 0 on success, non zero value on error
+ */
+static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
+{
+	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
+}
+
+/**
+ * ufshcd_get_req_rsp - returns the TR response transaction type
+ * @ucd_rsp_ptr: pointer to response UPIU
+ */
+static inline int
+ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
+{
+	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
+}
+
+/**
+ * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
+ * @ucd_rsp_ptr: pointer to response UPIU
+ *
+ * This function gets the response status and scsi_status from response UPIU
+ * Returns the response result code.
+ */
+static inline int
+ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
+{
+	return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
+}
+
+/*
+ * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
+ *				from response UPIU
+ * @ucd_rsp_ptr: pointer to response UPIU
+ *
+ * Return the data segment length.
+ */
+static inline unsigned int
+ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
+{
+	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
+		MASK_RSP_UPIU_DATA_SEG_LEN;
+}
+
+/**
+ * ufshcd_is_exception_event - Check if the device raised an exception event
+ * @ucd_rsp_ptr: pointer to response UPIU
+ *
+ * The function checks if the device raised an exception event indicated in
+ * the Device Information field of response UPIU.
+ *
+ * Returns true if exception is raised, false otherwise.
+ */
+static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
+{
+	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
+			MASK_RSP_EXCEPTION_EVENT;
+}
+
+/**
+ * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
+ * @hba: per adapter instance
+ */
+static inline void
+ufshcd_reset_intr_aggr(struct ufs_hba *hba)
+{
+	ufshcd_writel(hba, INT_AGGR_ENABLE |
+		      INT_AGGR_COUNTER_AND_TIMER_RESET,
+		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
+}
+
+/**
+ * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
+ * @hba: per adapter instance
+ * @cnt: Interrupt aggregation counter threshold
+ * @tmout: Interrupt aggregation timeout value
+ */
+static inline void
+ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
+{
+	ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
+		      INT_AGGR_COUNTER_THLD_VAL(cnt) |
+		      INT_AGGR_TIMEOUT_VAL(tmout),
+		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
+}
+
+/**
+ * ufshcd_disable_intr_aggr - Disables interrupt aggregation.
+ * @hba: per adapter instance
+ */
+static inline void ufshcd_disable_intr_aggr(struct ufs_hba *hba)
+{
+	ufshcd_writel(hba, 0, REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
+}
+
+/**
+ * ufshcd_enable_run_stop_reg - Enable run-stop registers,
+ *			When run-stop registers are set to 1, it indicates the
+ *			host controller that it can process the requests
+ * @hba: per adapter instance
+ */
+static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
+{
+	ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
+		      REG_UTP_TASK_REQ_LIST_RUN_STOP);
+	ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
+		      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
+}
+
+/**
+ * ufshcd_hba_start - Start controller initialization sequence
+ * @hba: per adapter instance
+ */
+static inline void ufshcd_hba_start(struct ufs_hba *hba)
+{
+	u32 val = CONTROLLER_ENABLE;
+
+	if (ufshcd_crypto_enable(hba))
+		val |= CRYPTO_GENERAL_ENABLE;
+
+	ufshcd_writel(hba, val, REG_CONTROLLER_ENABLE);
+}
+
+/**
+ * ufshcd_is_hba_active - Get controller state
+ * @hba: per adapter instance
+ *
+ * Returns true if and only if the controller is active.
+ */
+static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
+{
+	return ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE;
+}
+
+u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
+{
+	/* HCI version 1.0 and 1.1 supports UniPro 1.41 */
+	if (hba->ufs_version <= ufshci_version(1, 1))
+		return UFS_UNIPRO_VER_1_41;
+	else
+		return UFS_UNIPRO_VER_1_6;
+}
+EXPORT_SYMBOL(ufshcd_get_local_unipro_ver);
+
+static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
+{
+	/*
+	 * If both host and device support UniPro ver1.6 or later, PA layer
+	 * parameters tuning happens during link startup itself.
+	 *
+	 * We can manually tune PA layer parameters if either host or device
+	 * doesn't support UniPro ver 1.6 or later. But to keep manual tuning
+	 * logic simple, we will only do manual tuning if local unipro version
+	 * doesn't support ver1.6 or later.
+	 */
+	return ufshcd_get_local_unipro_ver(hba) < UFS_UNIPRO_VER_1_6;
+}
+
+/**
+ * ufshcd_set_clk_freq - set UFS controller clock frequencies
+ * @hba: per adapter instance
+ * @scale_up: If True, set max possible frequency othewise set low frequency
+ *
+ * Returns 0 if successful
+ * Returns < 0 for any other errors
+ */
+static int ufshcd_set_clk_freq(struct ufs_hba *hba, bool scale_up)
+{
+	int ret = 0;
+	struct ufs_clk_info *clki;
+	struct list_head *head = &hba->clk_list_head;
+
+	if (list_empty(head))
+		goto out;
+
+	list_for_each_entry(clki, head, list) {
+		if (!IS_ERR_OR_NULL(clki->clk)) {
+			if (scale_up && clki->max_freq) {
+				if (clki->curr_freq == clki->max_freq)
+					continue;
+
+				ret = clk_set_rate(clki->clk, clki->max_freq);
+				if (ret) {
+					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
+						__func__, clki->name,
+						clki->max_freq, ret);
+					break;
+				}
+				trace_ufshcd_clk_scaling(dev_name(hba->dev),
+						"scaled up", clki->name,
+						clki->curr_freq,
+						clki->max_freq);
+
+				clki->curr_freq = clki->max_freq;
+
+			} else if (!scale_up && clki->min_freq) {
+				if (clki->curr_freq == clki->min_freq)
+					continue;
+
+				ret = clk_set_rate(clki->clk, clki->min_freq);
+				if (ret) {
+					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
+						__func__, clki->name,
+						clki->min_freq, ret);
+					break;
+				}
+				trace_ufshcd_clk_scaling(dev_name(hba->dev),
+						"scaled down", clki->name,
+						clki->curr_freq,
+						clki->min_freq);
+				clki->curr_freq = clki->min_freq;
+			}
+		}
+		dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
+				clki->name, clk_get_rate(clki->clk));
+	}
+
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_scale_clks - scale up or scale down UFS controller clocks
+ * @hba: per adapter instance
+ * @scale_up: True if scaling up and false if scaling down
+ *
+ * Returns 0 if successful
+ * Returns < 0 for any other errors
+ */
+static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
+{
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_set_clk_freq(hba, scale_up);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
+	if (ret)
+		ufshcd_set_clk_freq(hba, !scale_up);
+
+out:
+	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
+			(scale_up ? "up" : "down"),
+			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+	return ret;
+}
+
+/**
+ * ufshcd_is_devfreq_scaling_required - check if scaling is required or not
+ * @hba: per adapter instance
+ * @scale_up: True if scaling up and false if scaling down
+ *
+ * Returns true if scaling is required, false otherwise.
+ */
+static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba,
+					       bool scale_up)
+{
+	struct ufs_clk_info *clki;
+	struct list_head *head = &hba->clk_list_head;
+
+	if (list_empty(head))
+		return false;
+
+	list_for_each_entry(clki, head, list) {
+		if (!IS_ERR_OR_NULL(clki->clk)) {
+			if (scale_up && clki->max_freq) {
+				if (clki->curr_freq == clki->max_freq)
+					continue;
+				return true;
+			} else if (!scale_up && clki->min_freq) {
+				if (clki->curr_freq == clki->min_freq)
+					continue;
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+/*
+ * Determine the number of pending commands by counting the bits in the SCSI
+ * device budget maps. This approach has been selected because a bit is set in
+ * the budget map before scsi_host_queue_ready() checks the host_self_blocked
+ * flag. The host_self_blocked flag can be modified by calling
+ * scsi_block_requests() or scsi_unblock_requests().
+ */
+static u32 ufshcd_pending_cmds(struct ufs_hba *hba)
+{
+	struct scsi_device *sdev;
+	u32 pending = 0;
+
+	lockdep_assert_held(hba->host->host_lock);
+	__shost_for_each_device(sdev, hba->host)
+		pending += sbitmap_weight(&sdev->budget_map);
+
+	return pending;
+}
+
+static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba,
+					u64 wait_timeout_us)
+{
+	unsigned long flags;
+	int ret = 0;
+	u32 tm_doorbell;
+	u32 tr_pending;
+	bool timeout = false, do_last_check = false;
+	ktime_t start;
+
+	ufshcd_hold(hba, false);
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	/*
+	 * Wait for all the outstanding tasks/transfer requests.
+	 * Verify by checking the doorbell registers are clear.
+	 */
+	start = ktime_get();
+	do {
+		if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) {
+			ret = -EBUSY;
+			goto out;
+		}
+
+		tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
+		tr_pending = ufshcd_pending_cmds(hba);
+		if (!tm_doorbell && !tr_pending) {
+			timeout = false;
+			break;
+		} else if (do_last_check) {
+			break;
+		}
+
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		schedule();
+		if (ktime_to_us(ktime_sub(ktime_get(), start)) >
+		    wait_timeout_us) {
+			timeout = true;
+			/*
+			 * We might have scheduled out for long time so make
+			 * sure to check if doorbells are cleared by this time
+			 * or not.
+			 */
+			do_last_check = true;
+		}
+		spin_lock_irqsave(hba->host->host_lock, flags);
+	} while (tm_doorbell || tr_pending);
+
+	if (timeout) {
+		dev_err(hba->dev,
+			"%s: timedout waiting for doorbell to clear (tm=0x%x, tr=0x%x)\n",
+			__func__, tm_doorbell, tr_pending);
+		ret = -EBUSY;
+	}
+out:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	ufshcd_release(hba);
+	return ret;
+}
+
+/**
+ * ufshcd_scale_gear - scale up/down UFS gear
+ * @hba: per adapter instance
+ * @scale_up: True for scaling up gear and false for scaling down
+ *
+ * Returns 0 for success,
+ * Returns -EBUSY if scaling can't happen at this time
+ * Returns non-zero for any other errors
+ */
+static int ufshcd_scale_gear(struct ufs_hba *hba, bool scale_up)
+{
+	int ret = 0;
+	struct ufs_pa_layer_attr new_pwr_info;
+
+	if (scale_up) {
+		memcpy(&new_pwr_info, &hba->clk_scaling.saved_pwr_info.info,
+		       sizeof(struct ufs_pa_layer_attr));
+	} else {
+		memcpy(&new_pwr_info, &hba->pwr_info,
+		       sizeof(struct ufs_pa_layer_attr));
+
+		if (hba->pwr_info.gear_tx > hba->clk_scaling.min_gear ||
+		    hba->pwr_info.gear_rx > hba->clk_scaling.min_gear) {
+			/* save the current power mode */
+			memcpy(&hba->clk_scaling.saved_pwr_info.info,
+				&hba->pwr_info,
+				sizeof(struct ufs_pa_layer_attr));
+
+			/* scale down gear */
+			new_pwr_info.gear_tx = hba->clk_scaling.min_gear;
+			new_pwr_info.gear_rx = hba->clk_scaling.min_gear;
+		}
+	}
+
+	/* check if the power mode needs to be changed or not? */
+	ret = ufshcd_config_pwr_mode(hba, &new_pwr_info);
+	if (ret)
+		dev_err(hba->dev, "%s: failed err %d, old gear: (tx %d rx %d), new gear: (tx %d rx %d)",
+			__func__, ret,
+			hba->pwr_info.gear_tx, hba->pwr_info.gear_rx,
+			new_pwr_info.gear_tx, new_pwr_info.gear_rx);
+
+	return ret;
+}
+
+static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba)
+{
+	#define DOORBELL_CLR_TOUT_US		(1000 * 1000) /* 1 sec */
+	int ret = 0;
+	/*
+	 * make sure that there are no outstanding requests when
+	 * clock scaling is in progress
+	 */
+	ufshcd_scsi_block_requests(hba);
+	down_write(&hba->clk_scaling_lock);
+
+	if (!hba->clk_scaling.is_allowed ||
+	    ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
+		ret = -EBUSY;
+		up_write(&hba->clk_scaling_lock);
+		ufshcd_scsi_unblock_requests(hba);
+		goto out;
+	}
+
+	/* let's not get into low power until clock scaling is completed */
+	ufshcd_hold(hba, false);
+
+out:
+	return ret;
+}
+
+static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba, bool writelock)
+{
+	if (writelock)
+		up_write(&hba->clk_scaling_lock);
+	else
+		up_read(&hba->clk_scaling_lock);
+	ufshcd_scsi_unblock_requests(hba);
+	ufshcd_release(hba);
+}
+
+/**
+ * ufshcd_devfreq_scale - scale up/down UFS clocks and gear
+ * @hba: per adapter instance
+ * @scale_up: True for scaling up and false for scalin down
+ *
+ * Returns 0 for success,
+ * Returns -EBUSY if scaling can't happen at this time
+ * Returns non-zero for any other errors
+ */
+static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
+{
+	int ret = 0;
+	bool is_writelock = true;
+
+	ret = ufshcd_clock_scaling_prepare(hba);
+	if (ret)
+		return ret;
+
+	/* scale down the gear before scaling down clocks */
+	if (!scale_up) {
+		ret = ufshcd_scale_gear(hba, false);
+		if (ret)
+			goto out_unprepare;
+	}
+
+	ret = ufshcd_scale_clks(hba, scale_up);
+	if (ret) {
+		if (!scale_up)
+			ufshcd_scale_gear(hba, true);
+		goto out_unprepare;
+	}
+
+	/* scale up the gear after scaling up clocks */
+	if (scale_up) {
+		ret = ufshcd_scale_gear(hba, true);
+		if (ret) {
+			ufshcd_scale_clks(hba, false);
+			goto out_unprepare;
+		}
+	}
+
+	/* Enable Write Booster if we have scaled up else disable it */
+	downgrade_write(&hba->clk_scaling_lock);
+	is_writelock = false;
+	ufshcd_wb_toggle(hba, scale_up);
+
+out_unprepare:
+	ufshcd_clock_scaling_unprepare(hba, is_writelock);
+	return ret;
+}
+
+static void ufshcd_clk_scaling_suspend_work(struct work_struct *work)
+{
+	struct ufs_hba *hba = container_of(work, struct ufs_hba,
+					   clk_scaling.suspend_work);
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(hba->host->host_lock, irq_flags);
+	if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		return;
+	}
+	hba->clk_scaling.is_suspended = true;
+	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+
+	__ufshcd_suspend_clkscaling(hba);
+}
+
+static void ufshcd_clk_scaling_resume_work(struct work_struct *work)
+{
+	struct ufs_hba *hba = container_of(work, struct ufs_hba,
+					   clk_scaling.resume_work);
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(hba->host->host_lock, irq_flags);
+	if (!hba->clk_scaling.is_suspended) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		return;
+	}
+	hba->clk_scaling.is_suspended = false;
+	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+
+	devfreq_resume_device(hba->devfreq);
+}
+
+static int ufshcd_devfreq_target(struct device *dev,
+				unsigned long *freq, u32 flags)
+{
+	int ret = 0;
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	ktime_t start;
+	bool scale_up, sched_clk_scaling_suspend_work = false;
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
+	unsigned long irq_flags;
+
+	if (!ufshcd_is_clkscaling_supported(hba))
+		return -EINVAL;
+
+	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
+	/* Override with the closest supported frequency */
+	*freq = (unsigned long) clk_round_rate(clki->clk, *freq);
+	spin_lock_irqsave(hba->host->host_lock, irq_flags);
+	if (ufshcd_eh_in_progress(hba)) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		return 0;
+	}
+
+	if (!hba->clk_scaling.active_reqs)
+		sched_clk_scaling_suspend_work = true;
+
+	if (list_empty(clk_list)) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		goto out;
+	}
+
+	/* Decide based on the rounded-off frequency and update */
+	scale_up = *freq == clki->max_freq;
+	if (!scale_up)
+		*freq = clki->min_freq;
+	/* Update the frequency */
+	if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		ret = 0;
+		goto out; /* no state change required */
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+
+	start = ktime_get();
+	ret = ufshcd_devfreq_scale(hba, scale_up);
+
+	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
+		(scale_up ? "up" : "down"),
+		ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+
+out:
+	if (sched_clk_scaling_suspend_work)
+		queue_work(hba->clk_scaling.workq,
+			   &hba->clk_scaling.suspend_work);
+
+	return ret;
+}
+
+static int ufshcd_devfreq_get_dev_status(struct device *dev,
+		struct devfreq_dev_status *stat)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
+	unsigned long flags;
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
+	ktime_t curr_t;
+
+	if (!ufshcd_is_clkscaling_supported(hba))
+		return -EINVAL;
+
+	memset(stat, 0, sizeof(*stat));
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	curr_t = ktime_get();
+	if (!scaling->window_start_t)
+		goto start_window;
+
+	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
+	/*
+	 * If current frequency is 0, then the ondemand governor considers
+	 * there's no initial frequency set. And it always requests to set
+	 * to max. frequency.
+	 */
+	stat->current_frequency = clki->curr_freq;
+	if (scaling->is_busy_started)
+		scaling->tot_busy_t += ktime_us_delta(curr_t,
+				scaling->busy_start_t);
+
+	stat->total_time = ktime_us_delta(curr_t, scaling->window_start_t);
+	stat->busy_time = scaling->tot_busy_t;
+start_window:
+	scaling->window_start_t = curr_t;
+	scaling->tot_busy_t = 0;
+
+	if (hba->outstanding_reqs) {
+		scaling->busy_start_t = curr_t;
+		scaling->is_busy_started = true;
+	} else {
+		scaling->busy_start_t = 0;
+		scaling->is_busy_started = false;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return 0;
+}
+
+static int ufshcd_devfreq_init(struct ufs_hba *hba)
+{
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
+	struct devfreq *devfreq;
+	int ret;
+
+	/* Skip devfreq if we don't have any clocks in the list */
+	if (list_empty(clk_list))
+		return 0;
+
+	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
+	dev_pm_opp_add(hba->dev, clki->min_freq, 0);
+	dev_pm_opp_add(hba->dev, clki->max_freq, 0);
+
+	ufshcd_vops_config_scaling_param(hba, &hba->vps->devfreq_profile,
+					 &hba->vps->ondemand_data);
+	devfreq = devfreq_add_device(hba->dev,
+			&hba->vps->devfreq_profile,
+			DEVFREQ_GOV_SIMPLE_ONDEMAND,
+			&hba->vps->ondemand_data);
+	if (IS_ERR(devfreq)) {
+		ret = PTR_ERR(devfreq);
+		dev_err(hba->dev, "Unable to register with devfreq %d\n", ret);
+
+		dev_pm_opp_remove(hba->dev, clki->min_freq);
+		dev_pm_opp_remove(hba->dev, clki->max_freq);
+		return ret;
+	}
+
+	hba->devfreq = devfreq;
+
+	return 0;
+}
+
+static void ufshcd_devfreq_remove(struct ufs_hba *hba)
+{
+	struct list_head *clk_list = &hba->clk_list_head;
+	struct ufs_clk_info *clki;
+
+	if (!hba->devfreq)
+		return;
+
+	devfreq_remove_device(hba->devfreq);
+	hba->devfreq = NULL;
+
+	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
+	dev_pm_opp_remove(hba->dev, clki->min_freq);
+	dev_pm_opp_remove(hba->dev, clki->max_freq);
+}
+
+static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba)
+{
+	unsigned long flags;
+
+	devfreq_suspend_device(hba->devfreq);
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->clk_scaling.window_start_t = 0;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
+{
+	unsigned long flags;
+	bool suspend = false;
+
+	cancel_work_sync(&hba->clk_scaling.suspend_work);
+	cancel_work_sync(&hba->clk_scaling.resume_work);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (!hba->clk_scaling.is_suspended) {
+		suspend = true;
+		hba->clk_scaling.is_suspended = true;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (suspend)
+		__ufshcd_suspend_clkscaling(hba);
+}
+
+static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
+{
+	unsigned long flags;
+	bool resume = false;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->clk_scaling.is_suspended) {
+		resume = true;
+		hba->clk_scaling.is_suspended = false;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (resume)
+		devfreq_resume_device(hba->devfreq);
+}
+
+static ssize_t ufshcd_clkscale_enable_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->clk_scaling.is_enabled);
+}
+
+static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	u32 value;
+	int err = 0;
+
+	if (kstrtou32(buf, 0, &value))
+		return -EINVAL;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	value = !!value;
+	if (value == hba->clk_scaling.is_enabled)
+		goto out;
+
+	ufshcd_rpm_get_sync(hba);
+	ufshcd_hold(hba, false);
+
+	hba->clk_scaling.is_enabled = value;
+
+	if (value) {
+		ufshcd_resume_clkscaling(hba);
+	} else {
+		ufshcd_suspend_clkscaling(hba);
+		err = ufshcd_devfreq_scale(hba, true);
+		if (err)
+			dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
+					__func__, err);
+	}
+
+	ufshcd_release(hba);
+	ufshcd_rpm_put_sync(hba);
+out:
+	up(&hba->host_sem);
+	return err ? err : count;
+}
+
+static void ufshcd_init_clk_scaling_sysfs(struct ufs_hba *hba)
+{
+	hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
+	hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
+	sysfs_attr_init(&hba->clk_scaling.enable_attr.attr);
+	hba->clk_scaling.enable_attr.attr.name = "clkscale_enable";
+	hba->clk_scaling.enable_attr.attr.mode = 0644;
+	if (device_create_file(hba->dev, &hba->clk_scaling.enable_attr))
+		dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
+}
+
+static void ufshcd_remove_clk_scaling_sysfs(struct ufs_hba *hba)
+{
+	if (hba->clk_scaling.enable_attr.attr.name)
+		device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
+}
+
+static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
+{
+	char wq_name[sizeof("ufs_clkscaling_00")];
+
+	if (!ufshcd_is_clkscaling_supported(hba))
+		return;
+
+	if (!hba->clk_scaling.min_gear)
+		hba->clk_scaling.min_gear = UFS_HS_G1;
+
+	INIT_WORK(&hba->clk_scaling.suspend_work,
+		  ufshcd_clk_scaling_suspend_work);
+	INIT_WORK(&hba->clk_scaling.resume_work,
+		  ufshcd_clk_scaling_resume_work);
+
+	snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
+		 hba->host->host_no);
+	hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
+
+	hba->clk_scaling.is_initialized = true;
+}
+
+static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
+{
+	if (!hba->clk_scaling.is_initialized)
+		return;
+
+	ufshcd_remove_clk_scaling_sysfs(hba);
+	destroy_workqueue(hba->clk_scaling.workq);
+	ufshcd_devfreq_remove(hba);
+	hba->clk_scaling.is_initialized = false;
+}
+
+static void ufshcd_ungate_work(struct work_struct *work)
+{
+	int ret;
+	unsigned long flags;
+	struct ufs_hba *hba = container_of(work, struct ufs_hba,
+			clk_gating.ungate_work);
+
+	cancel_delayed_work_sync(&hba->clk_gating.gate_work);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->clk_gating.state == CLKS_ON) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		goto unblock_reqs;
+	}
+
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	ufshcd_hba_vreg_set_hpm(hba);
+	ufshcd_setup_clocks(hba, true);
+
+	ufshcd_enable_irq(hba);
+
+	/* Exit from hibern8 */
+	if (ufshcd_can_hibern8_during_gating(hba)) {
+		/* Prevent gating in this path */
+		hba->clk_gating.is_suspended = true;
+		if (ufshcd_is_link_hibern8(hba)) {
+			ret = ufshcd_uic_hibern8_exit(hba);
+			if (ret)
+				dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
+					__func__, ret);
+			else
+				ufshcd_set_link_active(hba);
+		}
+		hba->clk_gating.is_suspended = false;
+	}
+unblock_reqs:
+	ufshcd_scsi_unblock_requests(hba);
+}
+
+/**
+ * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
+ * Also, exit from hibern8 mode and set the link as active.
+ * @hba: per adapter instance
+ * @async: This indicates whether caller should ungate clocks asynchronously.
+ */
+int ufshcd_hold(struct ufs_hba *hba, bool async)
+{
+	int rc = 0;
+	bool flush_result;
+	unsigned long flags;
+
+	if (!ufshcd_is_clkgating_allowed(hba) ||
+	    !hba->clk_gating.is_initialized)
+		goto out;
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->clk_gating.active_reqs++;
+
+start:
+	switch (hba->clk_gating.state) {
+	case CLKS_ON:
+		/*
+		 * Wait for the ungate work to complete if in progress.
+		 * Though the clocks may be in ON state, the link could
+		 * still be in hibner8 state if hibern8 is allowed
+		 * during clock gating.
+		 * Make sure we exit hibern8 state also in addition to
+		 * clocks being ON.
+		 */
+		if (ufshcd_can_hibern8_during_gating(hba) &&
+		    ufshcd_is_link_hibern8(hba)) {
+			if (async) {
+				rc = -EAGAIN;
+				hba->clk_gating.active_reqs--;
+				break;
+			}
+			spin_unlock_irqrestore(hba->host->host_lock, flags);
+			flush_result = flush_work(&hba->clk_gating.ungate_work);
+			if (hba->clk_gating.is_suspended && !flush_result)
+				goto out;
+			spin_lock_irqsave(hba->host->host_lock, flags);
+			goto start;
+		}
+		break;
+	case REQ_CLKS_OFF:
+		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
+			hba->clk_gating.state = CLKS_ON;
+			trace_ufshcd_clk_gating(dev_name(hba->dev),
+						hba->clk_gating.state);
+			break;
+		}
+		/*
+		 * If we are here, it means gating work is either done or
+		 * currently running. Hence, fall through to cancel gating
+		 * work and to enable clocks.
+		 */
+		fallthrough;
+	case CLKS_OFF:
+		hba->clk_gating.state = REQ_CLKS_ON;
+		trace_ufshcd_clk_gating(dev_name(hba->dev),
+					hba->clk_gating.state);
+		if (queue_work(hba->clk_gating.clk_gating_workq,
+			       &hba->clk_gating.ungate_work))
+			ufshcd_scsi_block_requests(hba);
+		/*
+		 * fall through to check if we should wait for this
+		 * work to be done or not.
+		 */
+		fallthrough;
+	case REQ_CLKS_ON:
+		if (async) {
+			rc = -EAGAIN;
+			hba->clk_gating.active_reqs--;
+			break;
+		}
+
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		flush_work(&hba->clk_gating.ungate_work);
+		/* Make sure state is CLKS_ON before returning */
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		goto start;
+	default:
+		dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
+				__func__, hba->clk_gating.state);
+		break;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+out:
+	return rc;
+}
+EXPORT_SYMBOL_GPL(ufshcd_hold);
+
+static void ufshcd_gate_work(struct work_struct *work)
+{
+	struct ufs_hba *hba = container_of(work, struct ufs_hba,
+			clk_gating.gate_work.work);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	/*
+	 * In case you are here to cancel this work the gating state
+	 * would be marked as REQ_CLKS_ON. In this case save time by
+	 * skipping the gating work and exit after changing the clock
+	 * state to CLKS_ON.
+	 */
+	if (hba->clk_gating.is_suspended ||
+		(hba->clk_gating.state != REQ_CLKS_OFF)) {
+		hba->clk_gating.state = CLKS_ON;
+		trace_ufshcd_clk_gating(dev_name(hba->dev),
+					hba->clk_gating.state);
+		goto rel_lock;
+	}
+
+	if (hba->clk_gating.active_reqs
+		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
+		|| hba->outstanding_reqs || hba->outstanding_tasks
+		|| hba->active_uic_cmd || hba->uic_async_done)
+		goto rel_lock;
+
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	/* put the link into hibern8 mode before turning off clocks */
+	if (ufshcd_can_hibern8_during_gating(hba)) {
+		ret = ufshcd_uic_hibern8_enter(hba);
+		if (ret) {
+			hba->clk_gating.state = CLKS_ON;
+			dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
+					__func__, ret);
+			trace_ufshcd_clk_gating(dev_name(hba->dev),
+						hba->clk_gating.state);
+			goto out;
+		}
+		ufshcd_set_link_hibern8(hba);
+	}
+
+	ufshcd_disable_irq(hba);
+
+	ufshcd_setup_clocks(hba, false);
+
+	/* Put the host controller in low power mode if possible */
+	ufshcd_hba_vreg_set_lpm(hba);
+	/*
+	 * In case you are here to cancel this work the gating state
+	 * would be marked as REQ_CLKS_ON. In this case keep the state
+	 * as REQ_CLKS_ON which would anyway imply that clocks are off
+	 * and a request to turn them on is pending. By doing this way,
+	 * we keep the state machine in tact and this would ultimately
+	 * prevent from doing cancel work multiple times when there are
+	 * new requests arriving before the current cancel work is done.
+	 */
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->clk_gating.state == REQ_CLKS_OFF) {
+		hba->clk_gating.state = CLKS_OFF;
+		trace_ufshcd_clk_gating(dev_name(hba->dev),
+					hba->clk_gating.state);
+	}
+rel_lock:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+out:
+	return;
+}
+
+/* host lock must be held before calling this variant */
+static void __ufshcd_release(struct ufs_hba *hba)
+{
+	if (!ufshcd_is_clkgating_allowed(hba))
+		return;
+
+	hba->clk_gating.active_reqs--;
+
+	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended ||
+	    hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL ||
+	    hba->outstanding_tasks || !hba->clk_gating.is_initialized ||
+	    hba->active_uic_cmd || hba->uic_async_done ||
+	    hba->clk_gating.state == CLKS_OFF)
+		return;
+
+	hba->clk_gating.state = REQ_CLKS_OFF;
+	trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
+	queue_delayed_work(hba->clk_gating.clk_gating_workq,
+			   &hba->clk_gating.gate_work,
+			   msecs_to_jiffies(hba->clk_gating.delay_ms));
+}
+
+void ufshcd_release(struct ufs_hba *hba)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	__ufshcd_release(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ufshcd_release);
+
+static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%lu\n", hba->clk_gating.delay_ms);
+}
+
+void ufshcd_clkgate_delay_set(struct device *dev, unsigned long value)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->clk_gating.delay_ms = value;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ufshcd_clkgate_delay_set);
+
+static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	unsigned long value;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	ufshcd_clkgate_delay_set(dev, value);
+	return count;
+}
+
+static ssize_t ufshcd_clkgate_enable_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", hba->clk_gating.is_enabled);
+}
+
+static ssize_t ufshcd_clkgate_enable_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	unsigned long flags;
+	u32 value;
+
+	if (kstrtou32(buf, 0, &value))
+		return -EINVAL;
+
+	value = !!value;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (value == hba->clk_gating.is_enabled)
+		goto out;
+
+	if (value)
+		__ufshcd_release(hba);
+	else
+		hba->clk_gating.active_reqs++;
+
+	hba->clk_gating.is_enabled = value;
+out:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return count;
+}
+
+static void ufshcd_init_clk_gating_sysfs(struct ufs_hba *hba)
+{
+	hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
+	hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
+	sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
+	hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
+	hba->clk_gating.delay_attr.attr.mode = 0644;
+	if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
+		dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");
+
+	hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
+	hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
+	sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
+	hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
+	hba->clk_gating.enable_attr.attr.mode = 0644;
+	if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
+		dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
+}
+
+static void ufshcd_remove_clk_gating_sysfs(struct ufs_hba *hba)
+{
+	if (hba->clk_gating.delay_attr.attr.name)
+		device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
+	if (hba->clk_gating.enable_attr.attr.name)
+		device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
+}
+
+static void ufshcd_init_clk_gating(struct ufs_hba *hba)
+{
+	char wq_name[sizeof("ufs_clk_gating_00")];
+
+	if (!ufshcd_is_clkgating_allowed(hba))
+		return;
+
+	hba->clk_gating.state = CLKS_ON;
+
+	hba->clk_gating.delay_ms = 150;
+	INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
+	INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);
+
+	snprintf(wq_name, ARRAY_SIZE(wq_name), "ufs_clk_gating_%d",
+		 hba->host->host_no);
+	hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name,
+					WQ_MEM_RECLAIM | WQ_HIGHPRI);
+
+	ufshcd_init_clk_gating_sysfs(hba);
+
+	hba->clk_gating.is_enabled = true;
+	hba->clk_gating.is_initialized = true;
+}
+
+static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
+{
+	if (!hba->clk_gating.is_initialized)
+		return;
+
+	ufshcd_remove_clk_gating_sysfs(hba);
+
+	/* Ungate the clock if necessary. */
+	ufshcd_hold(hba, false);
+	hba->clk_gating.is_initialized = false;
+	ufshcd_release(hba);
+
+	destroy_workqueue(hba->clk_gating.clk_gating_workq);
+}
+
+/* Must be called with host lock acquired */
+static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
+{
+	bool queue_resume_work = false;
+	ktime_t curr_t = ktime_get();
+	unsigned long flags;
+
+	if (!ufshcd_is_clkscaling_supported(hba))
+		return;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (!hba->clk_scaling.active_reqs++)
+		queue_resume_work = true;
+
+	if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		return;
+	}
+
+	if (queue_resume_work)
+		queue_work(hba->clk_scaling.workq,
+			   &hba->clk_scaling.resume_work);
+
+	if (!hba->clk_scaling.window_start_t) {
+		hba->clk_scaling.window_start_t = curr_t;
+		hba->clk_scaling.tot_busy_t = 0;
+		hba->clk_scaling.is_busy_started = false;
+	}
+
+	if (!hba->clk_scaling.is_busy_started) {
+		hba->clk_scaling.busy_start_t = curr_t;
+		hba->clk_scaling.is_busy_started = true;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
+{
+	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
+	unsigned long flags;
+
+	if (!ufshcd_is_clkscaling_supported(hba))
+		return;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->clk_scaling.active_reqs--;
+	if (!hba->outstanding_reqs && scaling->is_busy_started) {
+		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
+					scaling->busy_start_t));
+		scaling->busy_start_t = 0;
+		scaling->is_busy_started = false;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+static inline int ufshcd_monitor_opcode2dir(u8 opcode)
+{
+	if (opcode == READ_6 || opcode == READ_10 || opcode == READ_16)
+		return READ;
+	else if (opcode == WRITE_6 || opcode == WRITE_10 || opcode == WRITE_16)
+		return WRITE;
+	else
+		return -EINVAL;
+}
+
+static inline bool ufshcd_should_inform_monitor(struct ufs_hba *hba,
+						struct ufshcd_lrb *lrbp)
+{
+	struct ufs_hba_monitor *m = &hba->monitor;
+
+	return (m->enabled && lrbp && lrbp->cmd &&
+		(!m->chunk_size || m->chunk_size == lrbp->cmd->sdb.length) &&
+		ktime_before(hba->monitor.enabled_ts, lrbp->issue_time_stamp));
+}
+
+static void ufshcd_start_monitor(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (dir >= 0 && hba->monitor.nr_queued[dir]++ == 0)
+		hba->monitor.busy_start_ts[dir] = ktime_get();
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+static void ufshcd_update_monitor(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	int dir = ufshcd_monitor_opcode2dir(*lrbp->cmd->cmnd);
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (dir >= 0 && hba->monitor.nr_queued[dir] > 0) {
+		struct request *req = scsi_cmd_to_rq(lrbp->cmd);
+		struct ufs_hba_monitor *m = &hba->monitor;
+		ktime_t now, inc, lat;
+
+		now = lrbp->compl_time_stamp;
+		inc = ktime_sub(now, m->busy_start_ts[dir]);
+		m->total_busy[dir] = ktime_add(m->total_busy[dir], inc);
+		m->nr_sec_rw[dir] += blk_rq_sectors(req);
+
+		/* Update latencies */
+		m->nr_req[dir]++;
+		lat = ktime_sub(now, lrbp->issue_time_stamp);
+		m->lat_sum[dir] += lat;
+		if (m->lat_max[dir] < lat || !m->lat_max[dir])
+			m->lat_max[dir] = lat;
+		if (m->lat_min[dir] > lat || !m->lat_min[dir])
+			m->lat_min[dir] = lat;
+
+		m->nr_queued[dir]--;
+		/* Push forward the busy start of monitor */
+		m->busy_start_ts[dir] = now;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+}
+
+/**
+ * ufshcd_send_command - Send SCSI or device management commands
+ * @hba: per adapter instance
+ * @task_tag: Task tag of the command
+ */
+static inline
+void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
+{
+	struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
+	unsigned long flags;
+
+	lrbp->issue_time_stamp = ktime_get();
+	lrbp->compl_time_stamp = ktime_set(0, 0);
+	ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
+	ufshcd_clk_scaling_start_busy(hba);
+	if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
+		ufshcd_start_monitor(hba, lrbp);
+
+	spin_lock_irqsave(&hba->outstanding_lock, flags);
+	if (hba->vops && hba->vops->setup_xfer_req)
+		hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
+	__set_bit(task_tag, &hba->outstanding_reqs);
+	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+	spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+}
+
+/**
+ * ufshcd_copy_sense_data - Copy sense data in case of check condition
+ * @lrbp: pointer to local reference block
+ */
+static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
+{
+	u8 *const sense_buffer = lrbp->cmd->sense_buffer;
+	int len;
+
+	if (sense_buffer &&
+	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
+		int len_to_copy;
+
+		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
+		len_to_copy = min_t(int, UFS_SENSE_SIZE, len);
+
+		memcpy(sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
+		       len_to_copy);
+	}
+}
+
+/**
+ * ufshcd_copy_query_response() - Copy the Query Response and the data
+ * descriptor
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block
+ */
+static
+int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
+
+	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);
+
+	/* Get the descriptor */
+	if (hba->dev_cmd.query.descriptor &&
+	    lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
+		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
+				GENERAL_UPIU_REQUEST_SIZE;
+		u16 resp_len;
+		u16 buf_len;
+
+		/* data segment length */
+		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
+						MASK_QUERY_DATA_SEG_LEN;
+		buf_len = be16_to_cpu(
+				hba->dev_cmd.query.request.upiu_req.length);
+		if (likely(buf_len >= resp_len)) {
+			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
+		} else {
+			dev_warn(hba->dev,
+				 "%s: rsp size %d is bigger than buffer size %d",
+				 __func__, resp_len, buf_len);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * ufshcd_hba_capabilities - Read controller capabilities
+ * @hba: per adapter instance
+ *
+ * Return: 0 on success, negative on error.
+ */
+static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
+{
+	int err;
+
+	hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
+
+	/* nutrs and nutmrs are 0 based values */
+	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
+	hba->nutmrs =
+	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
+	hba->reserved_slot = hba->nutrs - 1;
+
+	/* Read crypto capabilities */
+	err = ufshcd_hba_init_crypto_capabilities(hba);
+	if (err)
+		dev_err(hba->dev, "crypto setup failed\n");
+
+	return err;
+}
+
+/**
+ * ufshcd_ready_for_uic_cmd - Check if controller is ready
+ *                            to accept UIC commands
+ * @hba: per adapter instance
+ * Return true on success, else false
+ */
+static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
+{
+	return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY;
+}
+
+/**
+ * ufshcd_get_upmcrs - Get the power mode change request status
+ * @hba: Pointer to adapter instance
+ *
+ * This function gets the UPMCRS field of HCS register
+ * Returns value of UPMCRS field
+ */
+static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
+{
+	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
+}
+
+/**
+ * ufshcd_dispatch_uic_cmd - Dispatch an UIC command to the Unipro layer
+ * @hba: per adapter instance
+ * @uic_cmd: UIC command
+ */
+static inline void
+ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
+{
+	lockdep_assert_held(&hba->uic_cmd_mutex);
+
+	WARN_ON(hba->active_uic_cmd);
+
+	hba->active_uic_cmd = uic_cmd;
+
+	/* Write Args */
+	ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
+	ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
+	ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);
+
+	ufshcd_add_uic_command_trace(hba, uic_cmd, UFS_CMD_SEND);
+
+	/* Write UIC Cmd */
+	ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
+		      REG_UIC_COMMAND);
+}
+
+/**
+ * ufshcd_wait_for_uic_cmd - Wait for completion of an UIC command
+ * @hba: per adapter instance
+ * @uic_cmd: UIC command
+ *
+ * Returns 0 only if success.
+ */
+static int
+ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
+{
+	int ret;
+	unsigned long flags;
+
+	lockdep_assert_held(&hba->uic_cmd_mutex);
+
+	if (wait_for_completion_timeout(&uic_cmd->done,
+					msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
+		ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
+	} else {
+		ret = -ETIMEDOUT;
+		dev_err(hba->dev,
+			"uic cmd 0x%x with arg3 0x%x completion timeout\n",
+			uic_cmd->command, uic_cmd->argument3);
+
+		if (!uic_cmd->cmd_active) {
+			dev_err(hba->dev, "%s: UIC cmd has been completed, return the result\n",
+				__func__);
+			ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
+		}
+	}
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->active_uic_cmd = NULL;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return ret;
+}
+
+/**
+ * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
+ * @hba: per adapter instance
+ * @uic_cmd: UIC command
+ * @completion: initialize the completion only if this is set to true
+ *
+ * Returns 0 only if success.
+ */
+static int
+__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
+		      bool completion)
+{
+	lockdep_assert_held(&hba->uic_cmd_mutex);
+	lockdep_assert_held(hba->host->host_lock);
+
+	if (!ufshcd_ready_for_uic_cmd(hba)) {
+		dev_err(hba->dev,
+			"Controller not ready to accept UIC commands\n");
+		return -EIO;
+	}
+
+	if (completion)
+		init_completion(&uic_cmd->done);
+
+	uic_cmd->cmd_active = 1;
+	ufshcd_dispatch_uic_cmd(hba, uic_cmd);
+
+	return 0;
+}
+
+/**
+ * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
+ * @hba: per adapter instance
+ * @uic_cmd: UIC command
+ *
+ * Returns 0 only if success.
+ */
+int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
+{
+	int ret;
+	unsigned long flags;
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
+		return 0;
+
+	ufshcd_hold(hba, false);
+	mutex_lock(&hba->uic_cmd_mutex);
+	ufshcd_add_delay_before_dme_cmd(hba);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	if (!ret)
+		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);
+
+	mutex_unlock(&hba->uic_cmd_mutex);
+
+	ufshcd_release(hba);
+	return ret;
+}
+
+/**
+ * ufshcd_map_sg - Map scatter-gather list to prdt
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block
+ *
+ * Returns 0 in case of success, non-zero value in case of failure
+ */
+static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufshcd_sg_entry *prd_table;
+	struct scatterlist *sg;
+	struct scsi_cmnd *cmd;
+	int sg_segments;
+	int i;
+
+	cmd = lrbp->cmd;
+	sg_segments = scsi_dma_map(cmd);
+	if (sg_segments < 0)
+		return sg_segments;
+
+	if (sg_segments) {
+
+		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
+			lrbp->utr_descriptor_ptr->prd_table_length =
+				cpu_to_le16((sg_segments *
+					sizeof(struct ufshcd_sg_entry)));
+		else
+			lrbp->utr_descriptor_ptr->prd_table_length =
+				cpu_to_le16(sg_segments);
+
+		prd_table = lrbp->ucd_prdt_ptr;
+
+		scsi_for_each_sg(cmd, sg, sg_segments, i) {
+			const unsigned int len = sg_dma_len(sg);
+
+			/*
+			 * From the UFSHCI spec: "Data Byte Count (DBC): A '0'
+			 * based value that indicates the length, in bytes, of
+			 * the data block. A maximum of length of 256KB may
+			 * exist for any entry. Bits 1:0 of this field shall be
+			 * 11b to indicate Dword granularity. A value of '3'
+			 * indicates 4 bytes, '7' indicates 8 bytes, etc."
+			 */
+			WARN_ONCE(len > 256 * 1024, "len = %#x\n", len);
+			prd_table[i].size = cpu_to_le32(len - 1);
+			prd_table[i].addr = cpu_to_le64(sg->dma_address);
+			prd_table[i].reserved = 0;
+		}
+	} else {
+		lrbp->utr_descriptor_ptr->prd_table_length = 0;
+	}
+
+	return 0;
+}
+
+/**
+ * ufshcd_enable_intr - enable interrupts
+ * @hba: per adapter instance
+ * @intrs: interrupt bits
+ */
+static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
+{
+	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
+
+	if (hba->ufs_version == ufshci_version(1, 0)) {
+		u32 rw;
+		rw = set & INTERRUPT_MASK_RW_VER_10;
+		set = rw | ((set ^ intrs) & intrs);
+	} else {
+		set |= intrs;
+	}
+
+	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
+}
+
+/**
+ * ufshcd_disable_intr - disable interrupts
+ * @hba: per adapter instance
+ * @intrs: interrupt bits
+ */
+static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
+{
+	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
+
+	if (hba->ufs_version == ufshci_version(1, 0)) {
+		u32 rw;
+		rw = (set & INTERRUPT_MASK_RW_VER_10) &
+			~(intrs & INTERRUPT_MASK_RW_VER_10);
+		set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);
+
+	} else {
+		set &= ~intrs;
+	}
+
+	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
+}
+
+/**
+ * ufshcd_prepare_req_desc_hdr() - Fills the requests header
+ * descriptor according to request
+ * @lrbp: pointer to local reference block
+ * @upiu_flags: flags required in the header
+ * @cmd_dir: requests data direction
+ */
+static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
+			u8 *upiu_flags, enum dma_data_direction cmd_dir)
+{
+	struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
+	u32 data_direction;
+	u32 dword_0;
+	u32 dword_1 = 0;
+	u32 dword_3 = 0;
+
+	if (cmd_dir == DMA_FROM_DEVICE) {
+		data_direction = UTP_DEVICE_TO_HOST;
+		*upiu_flags = UPIU_CMD_FLAGS_READ;
+	} else if (cmd_dir == DMA_TO_DEVICE) {
+		data_direction = UTP_HOST_TO_DEVICE;
+		*upiu_flags = UPIU_CMD_FLAGS_WRITE;
+	} else {
+		data_direction = UTP_NO_DATA_TRANSFER;
+		*upiu_flags = UPIU_CMD_FLAGS_NONE;
+	}
+
+	dword_0 = data_direction | (lrbp->command_type
+				<< UPIU_COMMAND_TYPE_OFFSET);
+	if (lrbp->intr_cmd)
+		dword_0 |= UTP_REQ_DESC_INT_CMD;
+
+	/* Prepare crypto related dwords */
+	ufshcd_prepare_req_desc_hdr_crypto(lrbp, &dword_0, &dword_1, &dword_3);
+
+	/* Transfer request descriptor header fields */
+	req_desc->header.dword_0 = cpu_to_le32(dword_0);
+	req_desc->header.dword_1 = cpu_to_le32(dword_1);
+	/*
+	 * assigning invalid value for command status. Controller
+	 * updates OCS on command completion, with the command
+	 * status
+	 */
+	req_desc->header.dword_2 =
+		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
+	req_desc->header.dword_3 = cpu_to_le32(dword_3);
+
+	req_desc->prd_table_length = 0;
+}
+
+/**
+ * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
+ * for scsi commands
+ * @lrbp: local reference block pointer
+ * @upiu_flags: flags
+ */
+static
+void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u8 upiu_flags)
+{
+	struct scsi_cmnd *cmd = lrbp->cmd;
+	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
+	unsigned short cdb_len;
+
+	/* command descriptor fields */
+	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
+				UPIU_TRANSACTION_COMMAND, upiu_flags,
+				lrbp->lun, lrbp->task_tag);
+	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
+				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);
+
+	/* Total EHS length and Data segment length will be zero */
+	ucd_req_ptr->header.dword_2 = 0;
+
+	ucd_req_ptr->sc.exp_data_transfer_len = cpu_to_be32(cmd->sdb.length);
+
+	cdb_len = min_t(unsigned short, cmd->cmd_len, UFS_CDB_SIZE);
+	memset(ucd_req_ptr->sc.cdb, 0, UFS_CDB_SIZE);
+	memcpy(ucd_req_ptr->sc.cdb, cmd->cmnd, cdb_len);
+
+	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
+}
+
+/**
+ * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
+ * for query requsts
+ * @hba: UFS hba
+ * @lrbp: local reference block pointer
+ * @upiu_flags: flags
+ */
+static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
+				struct ufshcd_lrb *lrbp, u8 upiu_flags)
+{
+	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
+	struct ufs_query *query = &hba->dev_cmd.query;
+	u16 len = be16_to_cpu(query->request.upiu_req.length);
+
+	/* Query request header */
+	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
+			UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
+			lrbp->lun, lrbp->task_tag);
+	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
+			0, query->request.query_func, 0, 0);
+
+	/* Data segment length only need for WRITE_DESC */
+	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
+		ucd_req_ptr->header.dword_2 =
+			UPIU_HEADER_DWORD(0, 0, (len >> 8), (u8)len);
+	else
+		ucd_req_ptr->header.dword_2 = 0;
+
+	/* Copy the Query Request buffer as is */
+	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
+			QUERY_OSF_SIZE);
+
+	/* Copy the Descriptor */
+	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
+		memcpy(ucd_req_ptr + 1, query->descriptor, len);
+
+	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
+}
+
+static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
+{
+	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
+
+	memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));
+
+	/* command descriptor fields */
+	ucd_req_ptr->header.dword_0 =
+		UPIU_HEADER_DWORD(
+			UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
+	/* clear rest of the fields of basic header */
+	ucd_req_ptr->header.dword_1 = 0;
+	ucd_req_ptr->header.dword_2 = 0;
+
+	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
+}
+
+/**
+ * ufshcd_compose_devman_upiu - UFS Protocol Information Unit(UPIU)
+ *			     for Device Management Purposes
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block
+ */
+static int ufshcd_compose_devman_upiu(struct ufs_hba *hba,
+				      struct ufshcd_lrb *lrbp)
+{
+	u8 upiu_flags;
+	int ret = 0;
+
+	if (hba->ufs_version <= ufshci_version(1, 1))
+		lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
+	else
+		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
+
+	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
+	if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
+		ufshcd_prepare_utp_query_req_upiu(hba, lrbp, upiu_flags);
+	else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
+		ufshcd_prepare_utp_nop_upiu(lrbp);
+	else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+/**
+ * ufshcd_comp_scsi_upiu - UFS Protocol Information Unit(UPIU)
+ *			   for SCSI Purposes
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block
+ */
+static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	u8 upiu_flags;
+	int ret = 0;
+
+	if (hba->ufs_version <= ufshci_version(1, 1))
+		lrbp->command_type = UTP_CMD_TYPE_SCSI;
+	else
+		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
+
+	if (likely(lrbp->cmd)) {
+		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
+						lrbp->cmd->sc_data_direction);
+		ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
+	} else {
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/**
+ * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
+ * @upiu_wlun_id: UPIU W-LUN id
+ *
+ * Returns SCSI W-LUN id
+ */
+static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
+{
+	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
+}
+
+static inline bool is_device_wlun(struct scsi_device *sdev)
+{
+	return sdev->lun ==
+		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN);
+}
+
+/*
+ * Associate the UFS controller queue with the default and poll HCTX types.
+ * Initialize the mq_map[] arrays.
+ */
+static int ufshcd_map_queues(struct Scsi_Host *shost)
+{
+	int i, ret;
+
+	for (i = 0; i < shost->nr_maps; i++) {
+		struct blk_mq_queue_map *map = &shost->tag_set.map[i];
+
+		switch (i) {
+		case HCTX_TYPE_DEFAULT:
+		case HCTX_TYPE_POLL:
+			map->nr_queues = 1;
+			break;
+		case HCTX_TYPE_READ:
+			map->nr_queues = 0;
+			continue;
+		default:
+			WARN_ON_ONCE(true);
+		}
+		map->queue_offset = 0;
+		ret = blk_mq_map_queues(map);
+		WARN_ON_ONCE(ret);
+	}
+
+	return 0;
+}
+
+static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i)
+{
+	struct utp_transfer_cmd_desc *cmd_descp = hba->ucdl_base_addr;
+	struct utp_transfer_req_desc *utrdlp = hba->utrdl_base_addr;
+	dma_addr_t cmd_desc_element_addr = hba->ucdl_dma_addr +
+		i * sizeof(struct utp_transfer_cmd_desc);
+	u16 response_offset = offsetof(struct utp_transfer_cmd_desc,
+				       response_upiu);
+	u16 prdt_offset = offsetof(struct utp_transfer_cmd_desc, prd_table);
+
+	lrb->utr_descriptor_ptr = utrdlp + i;
+	lrb->utrd_dma_addr = hba->utrdl_dma_addr +
+		i * sizeof(struct utp_transfer_req_desc);
+	lrb->ucd_req_ptr = (struct utp_upiu_req *)(cmd_descp + i);
+	lrb->ucd_req_dma_addr = cmd_desc_element_addr;
+	lrb->ucd_rsp_ptr = (struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
+	lrb->ucd_rsp_dma_addr = cmd_desc_element_addr + response_offset;
+	lrb->ucd_prdt_ptr = cmd_descp[i].prd_table;
+	lrb->ucd_prdt_dma_addr = cmd_desc_element_addr + prdt_offset;
+}
+
+/**
+ * ufshcd_queuecommand - main entry point for SCSI requests
+ * @host: SCSI host pointer
+ * @cmd: command from SCSI Midlayer
+ *
+ * Returns 0 for success, non-zero in case of failure
+ */
+static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
+{
+	struct ufs_hba *hba = shost_priv(host);
+	int tag = scsi_cmd_to_rq(cmd)->tag;
+	struct ufshcd_lrb *lrbp;
+	int err = 0;
+
+	WARN_ONCE(tag < 0 || tag >= hba->nutrs, "Invalid tag %d\n", tag);
+
+	/*
+	 * Allows the UFS error handler to wait for prior ufshcd_queuecommand()
+	 * calls.
+	 */
+	rcu_read_lock();
+
+	switch (hba->ufshcd_state) {
+	case UFSHCD_STATE_OPERATIONAL:
+		break;
+	case UFSHCD_STATE_EH_SCHEDULED_NON_FATAL:
+		/*
+		 * SCSI error handler can call ->queuecommand() while UFS error
+		 * handler is in progress. Error interrupts could change the
+		 * state from UFSHCD_STATE_RESET to
+		 * UFSHCD_STATE_EH_SCHEDULED_NON_FATAL. Prevent requests
+		 * being issued in that case.
+		 */
+		if (ufshcd_eh_in_progress(hba)) {
+			err = SCSI_MLQUEUE_HOST_BUSY;
+			goto out;
+		}
+		break;
+	case UFSHCD_STATE_EH_SCHEDULED_FATAL:
+		/*
+		 * pm_runtime_get_sync() is used at error handling preparation
+		 * stage. If a scsi cmd, e.g. the SSU cmd, is sent from hba's
+		 * PM ops, it can never be finished if we let SCSI layer keep
+		 * retrying it, which gets err handler stuck forever. Neither
+		 * can we let the scsi cmd pass through, because UFS is in bad
+		 * state, the scsi cmd may eventually time out, which will get
+		 * err handler blocked for too long. So, just fail the scsi cmd
+		 * sent from PM ops, err handler can recover PM error anyways.
+		 */
+		if (hba->pm_op_in_progress) {
+			hba->force_reset = true;
+			set_host_byte(cmd, DID_BAD_TARGET);
+			scsi_done(cmd);
+			goto out;
+		}
+		fallthrough;
+	case UFSHCD_STATE_RESET:
+		err = SCSI_MLQUEUE_HOST_BUSY;
+		goto out;
+	case UFSHCD_STATE_ERROR:
+		set_host_byte(cmd, DID_ERROR);
+		scsi_done(cmd);
+		goto out;
+	}
+
+	hba->req_abort_count = 0;
+
+	err = ufshcd_hold(hba, true);
+	if (err) {
+		err = SCSI_MLQUEUE_HOST_BUSY;
+		goto out;
+	}
+	WARN_ON(ufshcd_is_clkgating_allowed(hba) &&
+		(hba->clk_gating.state != CLKS_ON));
+
+	lrbp = &hba->lrb[tag];
+	WARN_ON(lrbp->cmd);
+	lrbp->cmd = cmd;
+	lrbp->task_tag = tag;
+	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
+	lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba);
+
+	ufshcd_prepare_lrbp_crypto(scsi_cmd_to_rq(cmd), lrbp);
+
+	lrbp->req_abort_skip = false;
+
+	ufshpb_prep(hba, lrbp);
+
+	ufshcd_comp_scsi_upiu(hba, lrbp);
+
+	err = ufshcd_map_sg(hba, lrbp);
+	if (err) {
+		lrbp->cmd = NULL;
+		ufshcd_release(hba);
+		goto out;
+	}
+
+	ufshcd_send_command(hba, tag);
+
+out:
+	rcu_read_unlock();
+
+	if (ufs_trigger_eh()) {
+		unsigned long flags;
+
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		ufshcd_schedule_eh_work(hba);
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+	}
+
+	return err;
+}
+
+static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
+		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
+{
+	lrbp->cmd = NULL;
+	lrbp->task_tag = tag;
+	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
+	lrbp->intr_cmd = true; /* No interrupt aggregation */
+	ufshcd_prepare_lrbp_crypto(NULL, lrbp);
+	hba->dev_cmd.type = cmd_type;
+
+	return ufshcd_compose_devman_upiu(hba, lrbp);
+}
+
+static int
+ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
+{
+	int err = 0;
+	unsigned long flags;
+	u32 mask = 1 << tag;
+
+	/* clear outstanding transaction before retry */
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	ufshcd_utrl_clear(hba, tag);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	/*
+	 * wait for h/w to clear corresponding bit in door-bell.
+	 * max. wait is 1 sec.
+	 */
+	err = ufshcd_wait_for_register(hba,
+			REG_UTP_TRANSFER_REQ_DOOR_BELL,
+			mask, ~mask, 1000, 1000);
+
+	return err;
+}
+
+static int
+ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
+
+	/* Get the UPIU response */
+	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
+				UPIU_RSP_CODE_OFFSET;
+	return query_res->response;
+}
+
+/**
+ * ufshcd_dev_cmd_completion() - handles device management command responses
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block
+ */
+static int
+ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	int resp;
+	int err = 0;
+
+	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
+	resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
+
+	switch (resp) {
+	case UPIU_TRANSACTION_NOP_IN:
+		if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
+			err = -EINVAL;
+			dev_err(hba->dev, "%s: unexpected response %x\n",
+					__func__, resp);
+		}
+		break;
+	case UPIU_TRANSACTION_QUERY_RSP:
+		err = ufshcd_check_query_response(hba, lrbp);
+		if (!err)
+			err = ufshcd_copy_query_response(hba, lrbp);
+		break;
+	case UPIU_TRANSACTION_REJECT_UPIU:
+		/* TODO: handle Reject UPIU Response */
+		err = -EPERM;
+		dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
+				__func__);
+		break;
+	default:
+		err = -EINVAL;
+		dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
+				__func__, resp);
+		break;
+	}
+
+	return err;
+}
+
+static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
+		struct ufshcd_lrb *lrbp, int max_timeout)
+{
+	int err = 0;
+	unsigned long time_left;
+	unsigned long flags;
+
+	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
+			msecs_to_jiffies(max_timeout));
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->dev_cmd.complete = NULL;
+	if (likely(time_left)) {
+		err = ufshcd_get_tr_ocs(lrbp);
+		if (!err)
+			err = ufshcd_dev_cmd_completion(hba, lrbp);
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (!time_left) {
+		err = -ETIMEDOUT;
+		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
+			__func__, lrbp->task_tag);
+		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
+			/* successfully cleared the command, retry if needed */
+			err = -EAGAIN;
+		/*
+		 * in case of an error, after clearing the doorbell,
+		 * we also need to clear the outstanding_request
+		 * field in hba
+		 */
+		spin_lock_irqsave(&hba->outstanding_lock, flags);
+		__clear_bit(lrbp->task_tag, &hba->outstanding_reqs);
+		spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+	}
+
+	return err;
+}
+
+/**
+ * ufshcd_exec_dev_cmd - API for sending device management requests
+ * @hba: UFS hba
+ * @cmd_type: specifies the type (NOP, Query...)
+ * @timeout: timeout in milliseconds
+ *
+ * NOTE: Since there is only one available tag for device management commands,
+ * it is expected you hold the hba->dev_cmd.lock mutex.
+ */
+static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
+		enum dev_cmd_type cmd_type, int timeout)
+{
+	DECLARE_COMPLETION_ONSTACK(wait);
+	const u32 tag = hba->reserved_slot;
+	struct ufshcd_lrb *lrbp;
+	int err;
+
+	/* Protects use of hba->reserved_slot. */
+	lockdep_assert_held(&hba->dev_cmd.lock);
+
+	down_read(&hba->clk_scaling_lock);
+
+	lrbp = &hba->lrb[tag];
+	WARN_ON(lrbp->cmd);
+	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
+	if (unlikely(err))
+		goto out;
+
+	hba->dev_cmd.complete = &wait;
+
+	ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
+
+	ufshcd_send_command(hba, tag);
+	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
+	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
+				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
+
+out:
+	up_read(&hba->clk_scaling_lock);
+	return err;
+}
+
+/**
+ * ufshcd_init_query() - init the query response and request parameters
+ * @hba: per-adapter instance
+ * @request: address of the request pointer to be initialized
+ * @response: address of the response pointer to be initialized
+ * @opcode: operation to perform
+ * @idn: flag idn to access
+ * @index: LU number to access
+ * @selector: query/flag/descriptor further identification
+ */
+static inline void ufshcd_init_query(struct ufs_hba *hba,
+		struct ufs_query_req **request, struct ufs_query_res **response,
+		enum query_opcode opcode, u8 idn, u8 index, u8 selector)
+{
+	*request = &hba->dev_cmd.query.request;
+	*response = &hba->dev_cmd.query.response;
+	memset(*request, 0, sizeof(struct ufs_query_req));
+	memset(*response, 0, sizeof(struct ufs_query_res));
+	(*request)->upiu_req.opcode = opcode;
+	(*request)->upiu_req.idn = idn;
+	(*request)->upiu_req.index = index;
+	(*request)->upiu_req.selector = selector;
+}
+
+static int ufshcd_query_flag_retry(struct ufs_hba *hba,
+	enum query_opcode opcode, enum flag_idn idn, u8 index, bool *flag_res)
+{
+	int ret;
+	int retries;
+
+	for (retries = 0; retries < QUERY_REQ_RETRIES; retries++) {
+		ret = ufshcd_query_flag(hba, opcode, idn, index, flag_res);
+		if (ret)
+			dev_dbg(hba->dev,
+				"%s: failed with error %d, retries %d\n",
+				__func__, ret, retries);
+		else
+			break;
+	}
+
+	if (ret)
+		dev_err(hba->dev,
+			"%s: query attribute, opcode %d, idn %d, failed with error %d after %d retires\n",
+			__func__, opcode, idn, ret, retries);
+	return ret;
+}
+
+/**
+ * ufshcd_query_flag() - API function for sending flag query requests
+ * @hba: per-adapter instance
+ * @opcode: flag query to perform
+ * @idn: flag idn to access
+ * @index: flag index to access
+ * @flag_res: the flag value after the query request completes
+ *
+ * Returns 0 for success, non-zero in case of failure
+ */
+int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
+			enum flag_idn idn, u8 index, bool *flag_res)
+{
+	struct ufs_query_req *request = NULL;
+	struct ufs_query_res *response = NULL;
+	int err, selector = 0;
+	int timeout = QUERY_REQ_TIMEOUT;
+
+	BUG_ON(!hba);
+
+	ufshcd_hold(hba, false);
+	mutex_lock(&hba->dev_cmd.lock);
+	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
+			selector);
+
+	switch (opcode) {
+	case UPIU_QUERY_OPCODE_SET_FLAG:
+	case UPIU_QUERY_OPCODE_CLEAR_FLAG:
+	case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
+		break;
+	case UPIU_QUERY_OPCODE_READ_FLAG:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
+		if (!flag_res) {
+			/* No dummy reads */
+			dev_err(hba->dev, "%s: Invalid argument for read request\n",
+					__func__);
+			err = -EINVAL;
+			goto out_unlock;
+		}
+		break;
+	default:
+		dev_err(hba->dev,
+			"%s: Expected query flag opcode but got = %d\n",
+			__func__, opcode);
+		err = -EINVAL;
+		goto out_unlock;
+	}
+
+	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, timeout);
+
+	if (err) {
+		dev_err(hba->dev,
+			"%s: Sending flag query for idn %d failed, err = %d\n",
+			__func__, idn, err);
+		goto out_unlock;
+	}
+
+	if (flag_res)
+		*flag_res = (be32_to_cpu(response->upiu_res.value) &
+				MASK_QUERY_UPIU_FLAG_LOC) & 0x1;
+
+out_unlock:
+	mutex_unlock(&hba->dev_cmd.lock);
+	ufshcd_release(hba);
+	return err;
+}
+
+/**
+ * ufshcd_query_attr - API function for sending attribute requests
+ * @hba: per-adapter instance
+ * @opcode: attribute opcode
+ * @idn: attribute idn to access
+ * @index: index field
+ * @selector: selector field
+ * @attr_val: the attribute value after the query request completes
+ *
+ * Returns 0 for success, non-zero in case of failure
+*/
+int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
+		      enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
+{
+	struct ufs_query_req *request = NULL;
+	struct ufs_query_res *response = NULL;
+	int err;
+
+	BUG_ON(!hba);
+
+	if (!attr_val) {
+		dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
+				__func__, opcode);
+		return -EINVAL;
+	}
+
+	ufshcd_hold(hba, false);
+
+	mutex_lock(&hba->dev_cmd.lock);
+	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
+			selector);
+
+	switch (opcode) {
+	case UPIU_QUERY_OPCODE_WRITE_ATTR:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
+		request->upiu_req.value = cpu_to_be32(*attr_val);
+		break;
+	case UPIU_QUERY_OPCODE_READ_ATTR:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
+		break;
+	default:
+		dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
+				__func__, opcode);
+		err = -EINVAL;
+		goto out_unlock;
+	}
+
+	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
+
+	if (err) {
+		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
+				__func__, opcode, idn, index, err);
+		goto out_unlock;
+	}
+
+	*attr_val = be32_to_cpu(response->upiu_res.value);
+
+out_unlock:
+	mutex_unlock(&hba->dev_cmd.lock);
+	ufshcd_release(hba);
+	return err;
+}
+
+/**
+ * ufshcd_query_attr_retry() - API function for sending query
+ * attribute with retries
+ * @hba: per-adapter instance
+ * @opcode: attribute opcode
+ * @idn: attribute idn to access
+ * @index: index field
+ * @selector: selector field
+ * @attr_val: the attribute value after the query request
+ * completes
+ *
+ * Returns 0 for success, non-zero in case of failure
+*/
+int ufshcd_query_attr_retry(struct ufs_hba *hba,
+	enum query_opcode opcode, enum attr_idn idn, u8 index, u8 selector,
+	u32 *attr_val)
+{
+	int ret = 0;
+	u32 retries;
+
+	for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
+		ret = ufshcd_query_attr(hba, opcode, idn, index,
+						selector, attr_val);
+		if (ret)
+			dev_dbg(hba->dev, "%s: failed with error %d, retries %d\n",
+				__func__, ret, retries);
+		else
+			break;
+	}
+
+	if (ret)
+		dev_err(hba->dev,
+			"%s: query attribute, idn %d, failed with error %d after %d retires\n",
+			__func__, idn, ret, QUERY_REQ_RETRIES);
+	return ret;
+}
+
+static int __ufshcd_query_descriptor(struct ufs_hba *hba,
+			enum query_opcode opcode, enum desc_idn idn, u8 index,
+			u8 selector, u8 *desc_buf, int *buf_len)
+{
+	struct ufs_query_req *request = NULL;
+	struct ufs_query_res *response = NULL;
+	int err;
+
+	BUG_ON(!hba);
+
+	if (!desc_buf) {
+		dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
+				__func__, opcode);
+		return -EINVAL;
+	}
+
+	if (*buf_len < QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
+		dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
+				__func__, *buf_len);
+		return -EINVAL;
+	}
+
+	ufshcd_hold(hba, false);
+
+	mutex_lock(&hba->dev_cmd.lock);
+	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
+			selector);
+	hba->dev_cmd.query.descriptor = desc_buf;
+	request->upiu_req.length = cpu_to_be16(*buf_len);
+
+	switch (opcode) {
+	case UPIU_QUERY_OPCODE_WRITE_DESC:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
+		break;
+	case UPIU_QUERY_OPCODE_READ_DESC:
+		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
+		break;
+	default:
+		dev_err(hba->dev,
+				"%s: Expected query descriptor opcode but got = 0x%.2x\n",
+				__func__, opcode);
+		err = -EINVAL;
+		goto out_unlock;
+	}
+
+	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
+
+	if (err) {
+		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
+				__func__, opcode, idn, index, err);
+		goto out_unlock;
+	}
+
+	*buf_len = be16_to_cpu(response->upiu_res.length);
+
+out_unlock:
+	hba->dev_cmd.query.descriptor = NULL;
+	mutex_unlock(&hba->dev_cmd.lock);
+	ufshcd_release(hba);
+	return err;
+}
+
+/**
+ * ufshcd_query_descriptor_retry - API function for sending descriptor requests
+ * @hba: per-adapter instance
+ * @opcode: attribute opcode
+ * @idn: attribute idn to access
+ * @index: index field
+ * @selector: selector field
+ * @desc_buf: the buffer that contains the descriptor
+ * @buf_len: length parameter passed to the device
+ *
+ * Returns 0 for success, non-zero in case of failure.
+ * The buf_len parameter will contain, on return, the length parameter
+ * received on the response.
+ */
+int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
+				  enum query_opcode opcode,
+				  enum desc_idn idn, u8 index,
+				  u8 selector,
+				  u8 *desc_buf, int *buf_len)
+{
+	int err;
+	int retries;
+
+	for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
+		err = __ufshcd_query_descriptor(hba, opcode, idn, index,
+						selector, desc_buf, buf_len);
+		if (!err || err == -EINVAL)
+			break;
+	}
+
+	return err;
+}
+
+/**
+ * ufshcd_map_desc_id_to_length - map descriptor IDN to its length
+ * @hba: Pointer to adapter instance
+ * @desc_id: descriptor idn value
+ * @desc_len: mapped desc length (out)
+ */
+void ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id,
+				  int *desc_len)
+{
+	if (desc_id >= QUERY_DESC_IDN_MAX || desc_id == QUERY_DESC_IDN_RFU_0 ||
+	    desc_id == QUERY_DESC_IDN_RFU_1)
+		*desc_len = 0;
+	else
+		*desc_len = hba->desc_size[desc_id];
+}
+EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);
+
+static void ufshcd_update_desc_length(struct ufs_hba *hba,
+				      enum desc_idn desc_id, int desc_index,
+				      unsigned char desc_len)
+{
+	if (hba->desc_size[desc_id] == QUERY_DESC_MAX_SIZE &&
+	    desc_id != QUERY_DESC_IDN_STRING && desc_index != UFS_RPMB_UNIT)
+		/* For UFS 3.1, the normal unit descriptor is 10 bytes larger
+		 * than the RPMB unit, however, both descriptors share the same
+		 * desc_idn, to cover both unit descriptors with one length, we
+		 * choose the normal unit descriptor length by desc_index.
+		 */
+		hba->desc_size[desc_id] = desc_len;
+}
+
+/**
+ * ufshcd_read_desc_param - read the specified descriptor parameter
+ * @hba: Pointer to adapter instance
+ * @desc_id: descriptor idn value
+ * @desc_index: descriptor index
+ * @param_offset: offset of the parameter to read
+ * @param_read_buf: pointer to buffer where parameter would be read
+ * @param_size: sizeof(param_read_buf)
+ *
+ * Return 0 in case of success, non-zero otherwise
+ */
+int ufshcd_read_desc_param(struct ufs_hba *hba,
+			   enum desc_idn desc_id,
+			   int desc_index,
+			   u8 param_offset,
+			   u8 *param_read_buf,
+			   u8 param_size)
+{
+	int ret;
+	u8 *desc_buf;
+	int buff_len;
+	bool is_kmalloc = true;
+
+	/* Safety check */
+	if (desc_id >= QUERY_DESC_IDN_MAX || !param_size)
+		return -EINVAL;
+
+	/* Get the length of descriptor */
+	ufshcd_map_desc_id_to_length(hba, desc_id, &buff_len);
+	if (!buff_len) {
+		dev_err(hba->dev, "%s: Failed to get desc length\n", __func__);
+		return -EINVAL;
+	}
+
+	if (param_offset >= buff_len) {
+		dev_err(hba->dev, "%s: Invalid offset 0x%x in descriptor IDN 0x%x, length 0x%x\n",
+			__func__, param_offset, desc_id, buff_len);
+		return -EINVAL;
+	}
+
+	/* Check whether we need temp memory */
+	if (param_offset != 0 || param_size < buff_len) {
+		desc_buf = kzalloc(buff_len, GFP_KERNEL);
+		if (!desc_buf)
+			return -ENOMEM;
+	} else {
+		desc_buf = param_read_buf;
+		is_kmalloc = false;
+	}
+
+	/* Request for full descriptor */
+	ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+					desc_id, desc_index, 0,
+					desc_buf, &buff_len);
+
+	if (ret) {
+		dev_err(hba->dev, "%s: Failed reading descriptor. desc_id %d, desc_index %d, param_offset %d, ret %d\n",
+			__func__, desc_id, desc_index, param_offset, ret);
+		goto out;
+	}
+
+	/* Sanity check */
+	if (desc_buf[QUERY_DESC_DESC_TYPE_OFFSET] != desc_id) {
+		dev_err(hba->dev, "%s: invalid desc_id %d in descriptor header\n",
+			__func__, desc_buf[QUERY_DESC_DESC_TYPE_OFFSET]);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Update descriptor length */
+	buff_len = desc_buf[QUERY_DESC_LENGTH_OFFSET];
+	ufshcd_update_desc_length(hba, desc_id, desc_index, buff_len);
+
+	if (is_kmalloc) {
+		/* Make sure we don't copy more data than available */
+		if (param_offset >= buff_len)
+			ret = -EINVAL;
+		else
+			memcpy(param_read_buf, &desc_buf[param_offset],
+			       min_t(u32, param_size, buff_len - param_offset));
+	}
+out:
+	if (is_kmalloc)
+		kfree(desc_buf);
+	return ret;
+}
+
+/**
+ * struct uc_string_id - unicode string
+ *
+ * @len: size of this descriptor inclusive
+ * @type: descriptor type
+ * @uc: unicode string character
+ */
+struct uc_string_id {
+	u8 len;
+	u8 type;
+	wchar_t uc[];
+} __packed;
+
+/* replace non-printable or non-ASCII characters with spaces */
+static inline char ufshcd_remove_non_printable(u8 ch)
+{
+	return (ch >= 0x20 && ch <= 0x7e) ? ch : ' ';
+}
+
+/**
+ * ufshcd_read_string_desc - read string descriptor
+ * @hba: pointer to adapter instance
+ * @desc_index: descriptor index
+ * @buf: pointer to buffer where descriptor would be read,
+ *       the caller should free the memory.
+ * @ascii: if true convert from unicode to ascii characters
+ *         null terminated string.
+ *
+ * Return:
+ * *      string size on success.
+ * *      -ENOMEM: on allocation failure
+ * *      -EINVAL: on a wrong parameter
+ */
+int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
+			    u8 **buf, bool ascii)
+{
+	struct uc_string_id *uc_str;
+	u8 *str;
+	int ret;
+
+	if (!buf)
+		return -EINVAL;
+
+	uc_str = kzalloc(QUERY_DESC_MAX_SIZE, GFP_KERNEL);
+	if (!uc_str)
+		return -ENOMEM;
+
+	ret = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_STRING, desc_index, 0,
+				     (u8 *)uc_str, QUERY_DESC_MAX_SIZE);
+	if (ret < 0) {
+		dev_err(hba->dev, "Reading String Desc failed after %d retries. err = %d\n",
+			QUERY_REQ_RETRIES, ret);
+		str = NULL;
+		goto out;
+	}
+
+	if (uc_str->len <= QUERY_DESC_HDR_SIZE) {
+		dev_dbg(hba->dev, "String Desc is of zero length\n");
+		str = NULL;
+		ret = 0;
+		goto out;
+	}
+
+	if (ascii) {
+		ssize_t ascii_len;
+		int i;
+		/* remove header and divide by 2 to move from UTF16 to UTF8 */
+		ascii_len = (uc_str->len - QUERY_DESC_HDR_SIZE) / 2 + 1;
+		str = kzalloc(ascii_len, GFP_KERNEL);
+		if (!str) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		/*
+		 * the descriptor contains string in UTF16 format
+		 * we need to convert to utf-8 so it can be displayed
+		 */
+		ret = utf16s_to_utf8s(uc_str->uc,
+				      uc_str->len - QUERY_DESC_HDR_SIZE,
+				      UTF16_BIG_ENDIAN, str, ascii_len);
+
+		/* replace non-printable or non-ASCII characters with spaces */
+		for (i = 0; i < ret; i++)
+			str[i] = ufshcd_remove_non_printable(str[i]);
+
+		str[ret++] = '\0';
+
+	} else {
+		str = kmemdup(uc_str, uc_str->len, GFP_KERNEL);
+		if (!str) {
+			ret = -ENOMEM;
+			goto out;
+		}
+		ret = uc_str->len;
+	}
+out:
+	*buf = str;
+	kfree(uc_str);
+	return ret;
+}
+
+/**
+ * ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
+ * @hba: Pointer to adapter instance
+ * @lun: lun id
+ * @param_offset: offset of the parameter to read
+ * @param_read_buf: pointer to buffer where parameter would be read
+ * @param_size: sizeof(param_read_buf)
+ *
+ * Return 0 in case of success, non-zero otherwise
+ */
+static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
+					      int lun,
+					      enum unit_desc_param param_offset,
+					      u8 *param_read_buf,
+					      u32 param_size)
+{
+	/*
+	 * Unit descriptors are only available for general purpose LUs (LUN id
+	 * from 0 to 7) and RPMB Well known LU.
+	 */
+	if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun, param_offset))
+		return -EOPNOTSUPP;
+
+	return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
+				      param_offset, param_read_buf, param_size);
+}
+
+static int ufshcd_get_ref_clk_gating_wait(struct ufs_hba *hba)
+{
+	int err = 0;
+	u32 gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US;
+
+	if (hba->dev_info.wspecversion >= 0x300) {
+		err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+				QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME, 0, 0,
+				&gating_wait);
+		if (err)
+			dev_err(hba->dev, "Failed reading bRefClkGatingWait. err = %d, use default %uus\n",
+					 err, gating_wait);
+
+		if (gating_wait == 0) {
+			gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US;
+			dev_err(hba->dev, "Undefined ref clk gating wait time, use default %uus\n",
+					 gating_wait);
+		}
+
+		hba->dev_info.clk_gating_wait_us = gating_wait;
+	}
+
+	return err;
+}
+
+/**
+ * ufshcd_memory_alloc - allocate memory for host memory space data structures
+ * @hba: per adapter instance
+ *
+ * 1. Allocate DMA memory for Command Descriptor array
+ *	Each command descriptor consist of Command UPIU, Response UPIU and PRDT
+ * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
+ * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
+ *	(UTMRDL)
+ * 4. Allocate memory for local reference block(lrb).
+ *
+ * Returns 0 for success, non-zero in case of failure
+ */
+static int ufshcd_memory_alloc(struct ufs_hba *hba)
+{
+	size_t utmrdl_size, utrdl_size, ucdl_size;
+
+	/* Allocate memory for UTP command descriptors */
+	ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
+	hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
+						  ucdl_size,
+						  &hba->ucdl_dma_addr,
+						  GFP_KERNEL);
+
+	/*
+	 * UFSHCI requires UTP command descriptor to be 128 byte aligned.
+	 * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE
+	 * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will
+	 * be aligned to 128 bytes as well
+	 */
+	if (!hba->ucdl_base_addr ||
+	    WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) {
+		dev_err(hba->dev,
+			"Command Descriptor Memory allocation failed\n");
+		goto out;
+	}
+
+	/*
+	 * Allocate memory for UTP Transfer descriptors
+	 * UFSHCI requires 1024 byte alignment of UTRD
+	 */
+	utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
+	hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
+						   utrdl_size,
+						   &hba->utrdl_dma_addr,
+						   GFP_KERNEL);
+	if (!hba->utrdl_base_addr ||
+	    WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
+		dev_err(hba->dev,
+			"Transfer Descriptor Memory allocation failed\n");
+		goto out;
+	}
+
+	/*
+	 * Allocate memory for UTP Task Management descriptors
+	 * UFSHCI requires 1024 byte alignment of UTMRD
+	 */
+	utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
+	hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
+						    utmrdl_size,
+						    &hba->utmrdl_dma_addr,
+						    GFP_KERNEL);
+	if (!hba->utmrdl_base_addr ||
+	    WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
+		dev_err(hba->dev,
+		"Task Management Descriptor Memory allocation failed\n");
+		goto out;
+	}
+
+	/* Allocate memory for local reference block */
+	hba->lrb = devm_kcalloc(hba->dev,
+				hba->nutrs, sizeof(struct ufshcd_lrb),
+				GFP_KERNEL);
+	if (!hba->lrb) {
+		dev_err(hba->dev, "LRB Memory allocation failed\n");
+		goto out;
+	}
+	return 0;
+out:
+	return -ENOMEM;
+}
+
+/**
+ * ufshcd_host_memory_configure - configure local reference block with
+ *				memory offsets
+ * @hba: per adapter instance
+ *
+ * Configure Host memory space
+ * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA
+ * address.
+ * 2. Update each UTRD with Response UPIU offset, Response UPIU length
+ * and PRDT offset.
+ * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
+ * into local reference block.
+ */
+static void ufshcd_host_memory_configure(struct ufs_hba *hba)
+{
+	struct utp_transfer_req_desc *utrdlp;
+	dma_addr_t cmd_desc_dma_addr;
+	dma_addr_t cmd_desc_element_addr;
+	u16 response_offset;
+	u16 prdt_offset;
+	int cmd_desc_size;
+	int i;
+
+	utrdlp = hba->utrdl_base_addr;
+
+	response_offset =
+		offsetof(struct utp_transfer_cmd_desc, response_upiu);
+	prdt_offset =
+		offsetof(struct utp_transfer_cmd_desc, prd_table);
+
+	cmd_desc_size = sizeof(struct utp_transfer_cmd_desc);
+	cmd_desc_dma_addr = hba->ucdl_dma_addr;
+
+	for (i = 0; i < hba->nutrs; i++) {
+		/* Configure UTRD with command descriptor base address */
+		cmd_desc_element_addr =
+				(cmd_desc_dma_addr + (cmd_desc_size * i));
+		utrdlp[i].command_desc_base_addr_lo =
+				cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
+		utrdlp[i].command_desc_base_addr_hi =
+				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
+
+		/* Response upiu and prdt offset should be in double words */
+		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
+			utrdlp[i].response_upiu_offset =
+				cpu_to_le16(response_offset);
+			utrdlp[i].prd_table_offset =
+				cpu_to_le16(prdt_offset);
+			utrdlp[i].response_upiu_length =
+				cpu_to_le16(ALIGNED_UPIU_SIZE);
+		} else {
+			utrdlp[i].response_upiu_offset =
+				cpu_to_le16(response_offset >> 2);
+			utrdlp[i].prd_table_offset =
+				cpu_to_le16(prdt_offset >> 2);
+			utrdlp[i].response_upiu_length =
+				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
+		}
+
+		ufshcd_init_lrb(hba, &hba->lrb[i], i);
+	}
+}
+
+/**
+ * ufshcd_dme_link_startup - Notify Unipro to perform link startup
+ * @hba: per adapter instance
+ *
+ * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer,
+ * in order to initialize the Unipro link startup procedure.
+ * Once the Unipro links are up, the device connected to the controller
+ * is detected.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_dme_link_startup(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;
+
+	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+	if (ret)
+		dev_dbg(hba->dev,
+			"dme-link-startup: error code %d\n", ret);
+	return ret;
+}
+/**
+ * ufshcd_dme_reset - UIC command for DME_RESET
+ * @hba: per adapter instance
+ *
+ * DME_RESET command is issued in order to reset UniPro stack.
+ * This function now deals with cold reset.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_dme_reset(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	uic_cmd.command = UIC_CMD_DME_RESET;
+
+	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+	if (ret)
+		dev_err(hba->dev,
+			"dme-reset: error code %d\n", ret);
+
+	return ret;
+}
+
+int ufshcd_dme_configure_adapt(struct ufs_hba *hba,
+			       int agreed_gear,
+			       int adapt_val)
+{
+	int ret;
+
+	if (agreed_gear != UFS_HS_G4)
+		adapt_val = PA_NO_ADAPT;
+
+	ret = ufshcd_dme_set(hba,
+			     UIC_ARG_MIB(PA_TXHSADAPTTYPE),
+			     adapt_val);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dme_configure_adapt);
+
+/**
+ * ufshcd_dme_enable - UIC command for DME_ENABLE
+ * @hba: per adapter instance
+ *
+ * DME_ENABLE command is issued in order to enable UniPro stack.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_dme_enable(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	uic_cmd.command = UIC_CMD_DME_ENABLE;
+
+	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+	if (ret)
+		dev_err(hba->dev,
+			"dme-enable: error code %d\n", ret);
+
+	return ret;
+}
+
+static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
+{
+	#define MIN_DELAY_BEFORE_DME_CMDS_US	1000
+	unsigned long min_sleep_time_us;
+
+	if (!(hba->quirks & UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS))
+		return;
+
+	/*
+	 * last_dme_cmd_tstamp will be 0 only for 1st call to
+	 * this function
+	 */
+	if (unlikely(!ktime_to_us(hba->last_dme_cmd_tstamp))) {
+		min_sleep_time_us = MIN_DELAY_BEFORE_DME_CMDS_US;
+	} else {
+		unsigned long delta =
+			(unsigned long) ktime_to_us(
+				ktime_sub(ktime_get(),
+				hba->last_dme_cmd_tstamp));
+
+		if (delta < MIN_DELAY_BEFORE_DME_CMDS_US)
+			min_sleep_time_us =
+				MIN_DELAY_BEFORE_DME_CMDS_US - delta;
+		else
+			return; /* no more delay required */
+	}
+
+	/* allow sleep for extra 50us if needed */
+	usleep_range(min_sleep_time_us, min_sleep_time_us + 50);
+}
+
+/**
+ * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
+ * @hba: per adapter instance
+ * @attr_sel: uic command argument1
+ * @attr_set: attribute set type as uic command argument2
+ * @mib_val: setting value as uic command argument3
+ * @peer: indicate whether peer or local
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
+			u8 attr_set, u32 mib_val, u8 peer)
+{
+	struct uic_command uic_cmd = {0};
+	static const char *const action[] = {
+		"dme-set",
+		"dme-peer-set"
+	};
+	const char *set = action[!!peer];
+	int ret;
+	int retries = UFS_UIC_COMMAND_RETRIES;
+
+	uic_cmd.command = peer ?
+		UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
+	uic_cmd.argument1 = attr_sel;
+	uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
+	uic_cmd.argument3 = mib_val;
+
+	do {
+		/* for peer attributes we retry upon failure */
+		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+		if (ret)
+			dev_dbg(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
+				set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
+	} while (ret && peer && --retries);
+
+	if (ret)
+		dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x failed %d retries\n",
+			set, UIC_GET_ATTR_ID(attr_sel), mib_val,
+			UFS_UIC_COMMAND_RETRIES - retries);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);
+
+/**
+ * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
+ * @hba: per adapter instance
+ * @attr_sel: uic command argument1
+ * @mib_val: the value of the attribute as returned by the UIC command
+ * @peer: indicate whether peer or local
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
+			u32 *mib_val, u8 peer)
+{
+	struct uic_command uic_cmd = {0};
+	static const char *const action[] = {
+		"dme-get",
+		"dme-peer-get"
+	};
+	const char *get = action[!!peer];
+	int ret;
+	int retries = UFS_UIC_COMMAND_RETRIES;
+	struct ufs_pa_layer_attr orig_pwr_info;
+	struct ufs_pa_layer_attr temp_pwr_info;
+	bool pwr_mode_change = false;
+
+	if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)) {
+		orig_pwr_info = hba->pwr_info;
+		temp_pwr_info = orig_pwr_info;
+
+		if (orig_pwr_info.pwr_tx == FAST_MODE ||
+		    orig_pwr_info.pwr_rx == FAST_MODE) {
+			temp_pwr_info.pwr_tx = FASTAUTO_MODE;
+			temp_pwr_info.pwr_rx = FASTAUTO_MODE;
+			pwr_mode_change = true;
+		} else if (orig_pwr_info.pwr_tx == SLOW_MODE ||
+		    orig_pwr_info.pwr_rx == SLOW_MODE) {
+			temp_pwr_info.pwr_tx = SLOWAUTO_MODE;
+			temp_pwr_info.pwr_rx = SLOWAUTO_MODE;
+			pwr_mode_change = true;
+		}
+		if (pwr_mode_change) {
+			ret = ufshcd_change_power_mode(hba, &temp_pwr_info);
+			if (ret)
+				goto out;
+		}
+	}
+
+	uic_cmd.command = peer ?
+		UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
+	uic_cmd.argument1 = attr_sel;
+
+	do {
+		/* for peer attributes we retry upon failure */
+		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+		if (ret)
+			dev_dbg(hba->dev, "%s: attr-id 0x%x error code %d\n",
+				get, UIC_GET_ATTR_ID(attr_sel), ret);
+	} while (ret && peer && --retries);
+
+	if (ret)
+		dev_err(hba->dev, "%s: attr-id 0x%x failed %d retries\n",
+			get, UIC_GET_ATTR_ID(attr_sel),
+			UFS_UIC_COMMAND_RETRIES - retries);
+
+	if (mib_val && !ret)
+		*mib_val = uic_cmd.argument3;
+
+	if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)
+	    && pwr_mode_change)
+		ufshcd_change_power_mode(hba, &orig_pwr_info);
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
+
+/**
+ * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
+ * state) and waits for it to take effect.
+ *
+ * @hba: per adapter instance
+ * @cmd: UIC command to execute
+ *
+ * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER &
+ * DME_HIBERNATE_EXIT commands take some time to take its effect on both host
+ * and device UniPro link and hence it's final completion would be indicated by
+ * dedicated status bits in Interrupt Status register (UPMS, UHES, UHXS) in
+ * addition to normal UIC command completion Status (UCCS). This function only
+ * returns after the relevant status bits indicate the completion.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
+{
+	DECLARE_COMPLETION_ONSTACK(uic_async_done);
+	unsigned long flags;
+	u8 status;
+	int ret;
+	bool reenable_intr = false;
+
+	mutex_lock(&hba->uic_cmd_mutex);
+	ufshcd_add_delay_before_dme_cmd(hba);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (ufshcd_is_link_broken(hba)) {
+		ret = -ENOLINK;
+		goto out_unlock;
+	}
+	hba->uic_async_done = &uic_async_done;
+	if (ufshcd_readl(hba, REG_INTERRUPT_ENABLE) & UIC_COMMAND_COMPL) {
+		ufshcd_disable_intr(hba, UIC_COMMAND_COMPL);
+		/*
+		 * Make sure UIC command completion interrupt is disabled before
+		 * issuing UIC command.
+		 */
+		wmb();
+		reenable_intr = true;
+	}
+	ret = __ufshcd_send_uic_cmd(hba, cmd, false);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	if (ret) {
+		dev_err(hba->dev,
+			"pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
+			cmd->command, cmd->argument3, ret);
+		goto out;
+	}
+
+	if (!wait_for_completion_timeout(hba->uic_async_done,
+					 msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
+		dev_err(hba->dev,
+			"pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n",
+			cmd->command, cmd->argument3);
+
+		if (!cmd->cmd_active) {
+			dev_err(hba->dev, "%s: Power Mode Change operation has been completed, go check UPMCRS\n",
+				__func__);
+			goto check_upmcrs;
+		}
+
+		ret = -ETIMEDOUT;
+		goto out;
+	}
+
+check_upmcrs:
+	status = ufshcd_get_upmcrs(hba);
+	if (status != PWR_LOCAL) {
+		dev_err(hba->dev,
+			"pwr ctrl cmd 0x%x failed, host upmcrs:0x%x\n",
+			cmd->command, status);
+		ret = (status != PWR_OK) ? status : -1;
+	}
+out:
+	if (ret) {
+		ufshcd_print_host_state(hba);
+		ufshcd_print_pwr_info(hba);
+		ufshcd_print_evt_hist(hba);
+	}
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->active_uic_cmd = NULL;
+	hba->uic_async_done = NULL;
+	if (reenable_intr)
+		ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
+	if (ret) {
+		ufshcd_set_link_broken(hba);
+		ufshcd_schedule_eh_work(hba);
+	}
+out_unlock:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	mutex_unlock(&hba->uic_cmd_mutex);
+
+	return ret;
+}
+
+/**
+ * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
+ *				using DME_SET primitives.
+ * @hba: per adapter instance
+ * @mode: powr mode value
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP) {
+		ret = ufshcd_dme_set(hba,
+				UIC_ARG_MIB_SEL(PA_RXHSUNTERMCAP, 0), 1);
+		if (ret) {
+			dev_err(hba->dev, "%s: failed to enable PA_RXHSUNTERMCAP ret %d\n",
+						__func__, ret);
+			goto out;
+		}
+	}
+
+	uic_cmd.command = UIC_CMD_DME_SET;
+	uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE);
+	uic_cmd.argument3 = mode;
+	ufshcd_hold(hba, false);
+	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
+	ufshcd_release(hba);
+
+out:
+	return ret;
+}
+
+int ufshcd_link_recovery(struct ufs_hba *hba)
+{
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->ufshcd_state = UFSHCD_STATE_RESET;
+	ufshcd_set_eh_in_progress(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	/* Reset the attached device */
+	ufshcd_device_reset(hba);
+
+	ret = ufshcd_host_reset_and_restore(hba);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (ret)
+		hba->ufshcd_state = UFSHCD_STATE_ERROR;
+	ufshcd_clear_eh_in_progress(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (ret)
+		dev_err(hba->dev, "%s: link recovery failed, err %d",
+			__func__, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_link_recovery);
+
+int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
+{
+	int ret;
+	struct uic_command uic_cmd = {0};
+	ktime_t start = ktime_get();
+
+	ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, PRE_CHANGE);
+
+	uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
+	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
+	trace_ufshcd_profile_hibern8(dev_name(hba->dev), "enter",
+			     ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+
+	if (ret)
+		dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n",
+			__func__, ret);
+	else
+		ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER,
+								POST_CHANGE);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_enter);
+
+int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+	ktime_t start = ktime_get();
+
+	ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, PRE_CHANGE);
+
+	uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
+	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
+	trace_ufshcd_profile_hibern8(dev_name(hba->dev), "exit",
+			     ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+
+	if (ret) {
+		dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n",
+			__func__, ret);
+	} else {
+		ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT,
+								POST_CHANGE);
+		hba->ufs_stats.last_hibern8_exit_tstamp = ktime_get();
+		hba->ufs_stats.hibern8_exit_cnt++;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_uic_hibern8_exit);
+
+void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
+{
+	unsigned long flags;
+	bool update = false;
+
+	if (!ufshcd_is_auto_hibern8_supported(hba))
+		return;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->ahit != ahit) {
+		hba->ahit = ahit;
+		update = true;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (update &&
+	    !pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) {
+		ufshcd_rpm_get_sync(hba);
+		ufshcd_hold(hba, false);
+		ufshcd_auto_hibern8_enable(hba);
+		ufshcd_release(hba);
+		ufshcd_rpm_put_sync(hba);
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_auto_hibern8_update);
+
+void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
+{
+	if (!ufshcd_is_auto_hibern8_supported(hba))
+		return;
+
+	ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
+}
+
+ /**
+ * ufshcd_init_pwr_info - setting the POR (power on reset)
+ * values in hba power info
+ * @hba: per-adapter instance
+ */
+static void ufshcd_init_pwr_info(struct ufs_hba *hba)
+{
+	hba->pwr_info.gear_rx = UFS_PWM_G1;
+	hba->pwr_info.gear_tx = UFS_PWM_G1;
+	hba->pwr_info.lane_rx = 1;
+	hba->pwr_info.lane_tx = 1;
+	hba->pwr_info.pwr_rx = SLOWAUTO_MODE;
+	hba->pwr_info.pwr_tx = SLOWAUTO_MODE;
+	hba->pwr_info.hs_rate = 0;
+}
+
+/**
+ * ufshcd_get_max_pwr_mode - reads the max power mode negotiated with device
+ * @hba: per-adapter instance
+ */
+static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
+{
+	struct ufs_pa_layer_attr *pwr_info = &hba->max_pwr_info.info;
+
+	if (hba->max_pwr_info.is_valid)
+		return 0;
+
+	pwr_info->pwr_tx = FAST_MODE;
+	pwr_info->pwr_rx = FAST_MODE;
+	pwr_info->hs_rate = PA_HS_MODE_B;
+
+	/* Get the connected lane count */
+	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDRXDATALANES),
+			&pwr_info->lane_rx);
+	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
+			&pwr_info->lane_tx);
+
+	if (!pwr_info->lane_rx || !pwr_info->lane_tx) {
+		dev_err(hba->dev, "%s: invalid connected lanes value. rx=%d, tx=%d\n",
+				__func__,
+				pwr_info->lane_rx,
+				pwr_info->lane_tx);
+		return -EINVAL;
+	}
+
+	/*
+	 * First, get the maximum gears of HS speed.
+	 * If a zero value, it means there is no HSGEAR capability.
+	 * Then, get the maximum gears of PWM speed.
+	 */
+	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR), &pwr_info->gear_rx);
+	if (!pwr_info->gear_rx) {
+		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
+				&pwr_info->gear_rx);
+		if (!pwr_info->gear_rx) {
+			dev_err(hba->dev, "%s: invalid max pwm rx gear read = %d\n",
+				__func__, pwr_info->gear_rx);
+			return -EINVAL;
+		}
+		pwr_info->pwr_rx = SLOW_MODE;
+	}
+
+	ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR),
+			&pwr_info->gear_tx);
+	if (!pwr_info->gear_tx) {
+		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
+				&pwr_info->gear_tx);
+		if (!pwr_info->gear_tx) {
+			dev_err(hba->dev, "%s: invalid max pwm tx gear read = %d\n",
+				__func__, pwr_info->gear_tx);
+			return -EINVAL;
+		}
+		pwr_info->pwr_tx = SLOW_MODE;
+	}
+
+	hba->max_pwr_info.is_valid = true;
+	return 0;
+}
+
+static int ufshcd_change_power_mode(struct ufs_hba *hba,
+			     struct ufs_pa_layer_attr *pwr_mode)
+{
+	int ret;
+
+	/* if already configured to the requested pwr_mode */
+	if (!hba->force_pmc &&
+	    pwr_mode->gear_rx == hba->pwr_info.gear_rx &&
+	    pwr_mode->gear_tx == hba->pwr_info.gear_tx &&
+	    pwr_mode->lane_rx == hba->pwr_info.lane_rx &&
+	    pwr_mode->lane_tx == hba->pwr_info.lane_tx &&
+	    pwr_mode->pwr_rx == hba->pwr_info.pwr_rx &&
+	    pwr_mode->pwr_tx == hba->pwr_info.pwr_tx &&
+	    pwr_mode->hs_rate == hba->pwr_info.hs_rate) {
+		dev_dbg(hba->dev, "%s: power already configured\n", __func__);
+		return 0;
+	}
+
+	/*
+	 * Configure attributes for power mode change with below.
+	 * - PA_RXGEAR, PA_ACTIVERXDATALANES, PA_RXTERMINATION,
+	 * - PA_TXGEAR, PA_ACTIVETXDATALANES, PA_TXTERMINATION,
+	 * - PA_HSSERIES
+	 */
+	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), pwr_mode->gear_rx);
+	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
+			pwr_mode->lane_rx);
+	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
+			pwr_mode->pwr_rx == FAST_MODE)
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), true);
+	else
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), false);
+
+	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), pwr_mode->gear_tx);
+	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
+			pwr_mode->lane_tx);
+	if (pwr_mode->pwr_tx == FASTAUTO_MODE ||
+			pwr_mode->pwr_tx == FAST_MODE)
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), true);
+	else
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), false);
+
+	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
+	    pwr_mode->pwr_tx == FASTAUTO_MODE ||
+	    pwr_mode->pwr_rx == FAST_MODE ||
+	    pwr_mode->pwr_tx == FAST_MODE)
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
+						pwr_mode->hs_rate);
+
+	if (!(hba->quirks & UFSHCD_QUIRK_SKIP_DEF_UNIPRO_TIMEOUT_SETTING)) {
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA0),
+				DL_FC0ProtectionTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA1),
+				DL_TC0ReplayTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA2),
+				DL_AFC0ReqTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA3),
+				DL_FC1ProtectionTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA4),
+				DL_TC1ReplayTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA5),
+				DL_AFC1ReqTimeOutVal_Default);
+
+		ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalFC0ProtectionTimeOutVal),
+				DL_FC0ProtectionTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalTC0ReplayTimeOutVal),
+				DL_TC0ReplayTimeOutVal_Default);
+		ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalAFC0ReqTimeOutVal),
+				DL_AFC0ReqTimeOutVal_Default);
+	}
+
+	ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
+			| pwr_mode->pwr_tx);
+
+	if (ret) {
+		dev_err(hba->dev,
+			"%s: power mode change failed %d\n", __func__, ret);
+	} else {
+		ufshcd_vops_pwr_change_notify(hba, POST_CHANGE, NULL,
+								pwr_mode);
+
+		memcpy(&hba->pwr_info, pwr_mode,
+			sizeof(struct ufs_pa_layer_attr));
+	}
+
+	return ret;
+}
+
+/**
+ * ufshcd_config_pwr_mode - configure a new power mode
+ * @hba: per-adapter instance
+ * @desired_pwr_mode: desired power configuration
+ */
+int ufshcd_config_pwr_mode(struct ufs_hba *hba,
+		struct ufs_pa_layer_attr *desired_pwr_mode)
+{
+	struct ufs_pa_layer_attr final_params = { 0 };
+	int ret;
+
+	ret = ufshcd_vops_pwr_change_notify(hba, PRE_CHANGE,
+					desired_pwr_mode, &final_params);
+
+	if (ret)
+		memcpy(&final_params, desired_pwr_mode, sizeof(final_params));
+
+	ret = ufshcd_change_power_mode(hba, &final_params);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_config_pwr_mode);
+
+/**
+ * ufshcd_complete_dev_init() - checks device readiness
+ * @hba: per-adapter instance
+ *
+ * Set fDeviceInit flag and poll until device toggles it.
+ */
+static int ufshcd_complete_dev_init(struct ufs_hba *hba)
+{
+	int err;
+	bool flag_res = true;
+	ktime_t timeout;
+
+	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+		QUERY_FLAG_IDN_FDEVICEINIT, 0, NULL);
+	if (err) {
+		dev_err(hba->dev,
+			"%s setting fDeviceInit flag failed with error %d\n",
+			__func__, err);
+		goto out;
+	}
+
+	/* Poll fDeviceInit flag to be cleared */
+	timeout = ktime_add_ms(ktime_get(), FDEVICEINIT_COMPL_TIMEOUT);
+	do {
+		err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+					QUERY_FLAG_IDN_FDEVICEINIT, 0, &flag_res);
+		if (!flag_res)
+			break;
+		usleep_range(500, 1000);
+	} while (ktime_before(ktime_get(), timeout));
+
+	if (err) {
+		dev_err(hba->dev,
+				"%s reading fDeviceInit flag failed with error %d\n",
+				__func__, err);
+	} else if (flag_res) {
+		dev_err(hba->dev,
+				"%s fDeviceInit was not cleared by the device\n",
+				__func__);
+		err = -EBUSY;
+	}
+out:
+	return err;
+}
+
+/**
+ * ufshcd_make_hba_operational - Make UFS controller operational
+ * @hba: per adapter instance
+ *
+ * To bring UFS host controller to operational state,
+ * 1. Enable required interrupts
+ * 2. Configure interrupt aggregation
+ * 3. Program UTRL and UTMRL base address
+ * 4. Configure run-stop-registers
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_make_hba_operational(struct ufs_hba *hba)
+{
+	int err = 0;
+	u32 reg;
+
+	/* Enable required interrupts */
+	ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);
+
+	/* Configure interrupt aggregation */
+	if (ufshcd_is_intr_aggr_allowed(hba))
+		ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
+	else
+		ufshcd_disable_intr_aggr(hba);
+
+	/* Configure UTRL and UTMRL base address registers */
+	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
+			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
+	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
+			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
+	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
+			REG_UTP_TASK_REQ_LIST_BASE_L);
+	ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
+			REG_UTP_TASK_REQ_LIST_BASE_H);
+
+	/*
+	 * Make sure base address and interrupt setup are updated before
+	 * enabling the run/stop registers below.
+	 */
+	wmb();
+
+	/*
+	 * UCRDY, UTMRLDY and UTRLRDY bits must be 1
+	 */
+	reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
+	if (!(ufshcd_get_lists_status(reg))) {
+		ufshcd_enable_run_stop_reg(hba);
+	} else {
+		dev_err(hba->dev,
+			"Host controller not ready to process requests");
+		err = -EIO;
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(ufshcd_make_hba_operational);
+
+/**
+ * ufshcd_hba_stop - Send controller to reset state
+ * @hba: per adapter instance
+ */
+void ufshcd_hba_stop(struct ufs_hba *hba)
+{
+	unsigned long flags;
+	int err;
+
+	/*
+	 * Obtain the host lock to prevent that the controller is disabled
+	 * while the UFS interrupt handler is active on another CPU.
+	 */
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	ufshcd_writel(hba, CONTROLLER_DISABLE,  REG_CONTROLLER_ENABLE);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	err = ufshcd_wait_for_register(hba, REG_CONTROLLER_ENABLE,
+					CONTROLLER_ENABLE, CONTROLLER_DISABLE,
+					10, 1);
+	if (err)
+		dev_err(hba->dev, "%s: Controller disable failed\n", __func__);
+}
+EXPORT_SYMBOL_GPL(ufshcd_hba_stop);
+
+/**
+ * ufshcd_hba_execute_hce - initialize the controller
+ * @hba: per adapter instance
+ *
+ * The controller resets itself and controller firmware initialization
+ * sequence kicks off. When controller is ready it will set
+ * the Host Controller Enable bit to 1.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
+{
+	int retry_outer = 3;
+	int retry_inner;
+
+start:
+	if (ufshcd_is_hba_active(hba))
+		/* change controller state to "reset state" */
+		ufshcd_hba_stop(hba);
+
+	/* UniPro link is disabled at this point */
+	ufshcd_set_link_off(hba);
+
+	ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);
+
+	/* start controller initialization sequence */
+	ufshcd_hba_start(hba);
+
+	/*
+	 * To initialize a UFS host controller HCE bit must be set to 1.
+	 * During initialization the HCE bit value changes from 1->0->1.
+	 * When the host controller completes initialization sequence
+	 * it sets the value of HCE bit to 1. The same HCE bit is read back
+	 * to check if the controller has completed initialization sequence.
+	 * So without this delay the value HCE = 1, set in the previous
+	 * instruction might be read back.
+	 * This delay can be changed based on the controller.
+	 */
+	ufshcd_delay_us(hba->vps->hba_enable_delay_us, 100);
+
+	/* wait for the host controller to complete initialization */
+	retry_inner = 50;
+	while (!ufshcd_is_hba_active(hba)) {
+		if (retry_inner) {
+			retry_inner--;
+		} else {
+			dev_err(hba->dev,
+				"Controller enable failed\n");
+			if (retry_outer) {
+				retry_outer--;
+				goto start;
+			}
+			return -EIO;
+		}
+		usleep_range(1000, 1100);
+	}
+
+	/* enable UIC related interrupts */
+	ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
+
+	ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
+
+	return 0;
+}
+
+int ufshcd_hba_enable(struct ufs_hba *hba)
+{
+	int ret;
+
+	if (hba->quirks & UFSHCI_QUIRK_BROKEN_HCE) {
+		ufshcd_set_link_off(hba);
+		ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);
+
+		/* enable UIC related interrupts */
+		ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
+		ret = ufshcd_dme_reset(hba);
+		if (!ret) {
+			ret = ufshcd_dme_enable(hba);
+			if (!ret)
+				ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
+			if (ret)
+				dev_err(hba->dev,
+					"Host controller enable failed with non-hce\n");
+		}
+	} else {
+		ret = ufshcd_hba_execute_hce(hba);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_hba_enable);
+
+static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
+{
+	int tx_lanes = 0, i, err = 0;
+
+	if (!peer)
+		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
+			       &tx_lanes);
+	else
+		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
+				    &tx_lanes);
+	for (i = 0; i < tx_lanes; i++) {
+		if (!peer)
+			err = ufshcd_dme_set(hba,
+				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
+					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
+					0);
+		else
+			err = ufshcd_dme_peer_set(hba,
+				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
+					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
+					0);
+		if (err) {
+			dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d",
+				__func__, peer, i, err);
+			break;
+		}
+	}
+
+	return err;
+}
+
+static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)
+{
+	return ufshcd_disable_tx_lcc(hba, true);
+}
+
+void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val)
+{
+	struct ufs_event_hist *e;
+
+	if (id >= UFS_EVT_CNT)
+		return;
+
+	e = &hba->ufs_stats.event[id];
+	e->val[e->pos] = val;
+	e->tstamp[e->pos] = ktime_get();
+	e->cnt += 1;
+	e->pos = (e->pos + 1) % UFS_EVENT_HIST_LENGTH;
+
+	ufshcd_vops_event_notify(hba, id, &val);
+}
+EXPORT_SYMBOL_GPL(ufshcd_update_evt_hist);
+
+/**
+ * ufshcd_link_startup - Initialize unipro link startup
+ * @hba: per adapter instance
+ *
+ * Returns 0 for success, non-zero in case of failure
+ */
+static int ufshcd_link_startup(struct ufs_hba *hba)
+{
+	int ret;
+	int retries = DME_LINKSTARTUP_RETRIES;
+	bool link_startup_again = false;
+
+	/*
+	 * If UFS device isn't active then we will have to issue link startup
+	 * 2 times to make sure the device state move to active.
+	 */
+	if (!ufshcd_is_ufs_dev_active(hba))
+		link_startup_again = true;
+
+link_startup:
+	do {
+		ufshcd_vops_link_startup_notify(hba, PRE_CHANGE);
+
+		ret = ufshcd_dme_link_startup(hba);
+
+		/* check if device is detected by inter-connect layer */
+		if (!ret && !ufshcd_is_device_present(hba)) {
+			ufshcd_update_evt_hist(hba,
+					       UFS_EVT_LINK_STARTUP_FAIL,
+					       0);
+			dev_err(hba->dev, "%s: Device not present\n", __func__);
+			ret = -ENXIO;
+			goto out;
+		}
+
+		/*
+		 * DME link lost indication is only received when link is up,
+		 * but we can't be sure if the link is up until link startup
+		 * succeeds. So reset the local Uni-Pro and try again.
+		 */
+		if (ret && ufshcd_hba_enable(hba)) {
+			ufshcd_update_evt_hist(hba,
+					       UFS_EVT_LINK_STARTUP_FAIL,
+					       (u32)ret);
+			goto out;
+		}
+	} while (ret && retries--);
+
+	if (ret) {
+		/* failed to get the link up... retire */
+		ufshcd_update_evt_hist(hba,
+				       UFS_EVT_LINK_STARTUP_FAIL,
+				       (u32)ret);
+		goto out;
+	}
+
+	if (link_startup_again) {
+		link_startup_again = false;
+		retries = DME_LINKSTARTUP_RETRIES;
+		goto link_startup;
+	}
+
+	/* Mark that link is up in PWM-G1, 1-lane, SLOW-AUTO mode */
+	ufshcd_init_pwr_info(hba);
+	ufshcd_print_pwr_info(hba);
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) {
+		ret = ufshcd_disable_device_tx_lcc(hba);
+		if (ret)
+			goto out;
+	}
+
+	/* Include any host controller configuration via UIC commands */
+	ret = ufshcd_vops_link_startup_notify(hba, POST_CHANGE);
+	if (ret)
+		goto out;
+
+	/* Clear UECPA once due to LINERESET has happened during LINK_STARTUP */
+	ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
+	ret = ufshcd_make_hba_operational(hba);
+out:
+	if (ret) {
+		dev_err(hba->dev, "link startup failed %d\n", ret);
+		ufshcd_print_host_state(hba);
+		ufshcd_print_pwr_info(hba);
+		ufshcd_print_evt_hist(hba);
+	}
+	return ret;
+}
+
+/**
+ * ufshcd_verify_dev_init() - Verify device initialization
+ * @hba: per-adapter instance
+ *
+ * Send NOP OUT UPIU and wait for NOP IN response to check whether the
+ * device Transport Protocol (UTP) layer is ready after a reset.
+ * If the UTP layer at the device side is not initialized, it may
+ * not respond with NOP IN UPIU within timeout of %NOP_OUT_TIMEOUT
+ * and we retry sending NOP OUT for %NOP_OUT_RETRIES iterations.
+ */
+static int ufshcd_verify_dev_init(struct ufs_hba *hba)
+{
+	int err = 0;
+	int retries;
+
+	ufshcd_hold(hba, false);
+	mutex_lock(&hba->dev_cmd.lock);
+	for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
+		err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
+					  hba->nop_out_timeout);
+
+		if (!err || err == -ETIMEDOUT)
+			break;
+
+		dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
+	}
+	mutex_unlock(&hba->dev_cmd.lock);
+	ufshcd_release(hba);
+
+	if (err)
+		dev_err(hba->dev, "%s: NOP OUT failed %d\n", __func__, err);
+	return err;
+}
+
+/**
+ * ufshcd_set_queue_depth - set lun queue depth
+ * @sdev: pointer to SCSI device
+ *
+ * Read bLUQueueDepth value and activate scsi tagged command
+ * queueing. For WLUN, queue depth is set to 1. For best-effort
+ * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
+ * value that host can queue.
+ */
+static void ufshcd_set_queue_depth(struct scsi_device *sdev)
+{
+	int ret = 0;
+	u8 lun_qdepth;
+	struct ufs_hba *hba;
+
+	hba = shost_priv(sdev->host);
+
+	lun_qdepth = hba->nutrs;
+	ret = ufshcd_read_unit_desc_param(hba,
+					  ufshcd_scsi_to_upiu_lun(sdev->lun),
+					  UNIT_DESC_PARAM_LU_Q_DEPTH,
+					  &lun_qdepth,
+					  sizeof(lun_qdepth));
+
+	/* Some WLUN doesn't support unit descriptor */
+	if (ret == -EOPNOTSUPP)
+		lun_qdepth = 1;
+	else if (!lun_qdepth)
+		/* eventually, we can figure out the real queue depth */
+		lun_qdepth = hba->nutrs;
+	else
+		lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);
+
+	dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
+			__func__, lun_qdepth);
+	scsi_change_queue_depth(sdev, lun_qdepth);
+}
+
+/*
+ * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
+ * @hba: per-adapter instance
+ * @lun: UFS device lun id
+ * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
+ *
+ * Returns 0 in case of success and b_lu_write_protect status would be returned
+ * @b_lu_write_protect parameter.
+ * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
+ * Returns -EINVAL in case of invalid parameters passed to this function.
+ */
+static int ufshcd_get_lu_wp(struct ufs_hba *hba,
+			    u8 lun,
+			    u8 *b_lu_write_protect)
+{
+	int ret;
+
+	if (!b_lu_write_protect)
+		ret = -EINVAL;
+	/*
+	 * According to UFS device spec, RPMB LU can't be write
+	 * protected so skip reading bLUWriteProtect parameter for
+	 * it. For other W-LUs, UNIT DESCRIPTOR is not available.
+	 */
+	else if (lun >= hba->dev_info.max_lu_supported)
+		ret = -ENOTSUPP;
+	else
+		ret = ufshcd_read_unit_desc_param(hba,
+					  lun,
+					  UNIT_DESC_PARAM_LU_WR_PROTECT,
+					  b_lu_write_protect,
+					  sizeof(*b_lu_write_protect));
+	return ret;
+}
+
+/**
+ * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
+ * status
+ * @hba: per-adapter instance
+ * @sdev: pointer to SCSI device
+ *
+ */
+static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
+						    struct scsi_device *sdev)
+{
+	if (hba->dev_info.f_power_on_wp_en &&
+	    !hba->dev_info.is_lu_power_on_wp) {
+		u8 b_lu_write_protect;
+
+		if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
+				      &b_lu_write_protect) &&
+		    (b_lu_write_protect == UFS_LU_POWER_ON_WP))
+			hba->dev_info.is_lu_power_on_wp = true;
+	}
+}
+
+/**
+ * ufshcd_setup_links - associate link b/w device wlun and other luns
+ * @sdev: pointer to SCSI device
+ * @hba: pointer to ufs hba
+ */
+static void ufshcd_setup_links(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct device_link *link;
+
+	/*
+	 * Device wlun is the supplier & rest of the luns are consumers.
+	 * This ensures that device wlun suspends after all other luns.
+	 */
+	if (hba->ufs_device_wlun) {
+		link = device_link_add(&sdev->sdev_gendev,
+				       &hba->ufs_device_wlun->sdev_gendev,
+				       DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+		if (!link) {
+			dev_err(&sdev->sdev_gendev, "Failed establishing link - %s\n",
+				dev_name(&hba->ufs_device_wlun->sdev_gendev));
+			return;
+		}
+		hba->luns_avail--;
+		/* Ignore REPORT_LUN wlun probing */
+		if (hba->luns_avail == 1) {
+			ufshcd_rpm_put(hba);
+			return;
+		}
+	} else {
+		/*
+		 * Device wlun is probed. The assumption is that WLUNs are
+		 * scanned before other LUNs.
+		 */
+		hba->luns_avail--;
+	}
+}
+
+/**
+ * ufshcd_slave_alloc - handle initial SCSI device configurations
+ * @sdev: pointer to SCSI device
+ *
+ * Returns success
+ */
+static int ufshcd_slave_alloc(struct scsi_device *sdev)
+{
+	struct ufs_hba *hba;
+
+	hba = shost_priv(sdev->host);
+
+	/* Mode sense(6) is not supported by UFS, so use Mode sense(10) */
+	sdev->use_10_for_ms = 1;
+
+	/* DBD field should be set to 1 in mode sense(10) */
+	sdev->set_dbd_for_ms = 1;
+
+	/* allow SCSI layer to restart the device in case of errors */
+	sdev->allow_restart = 1;
+
+	/* REPORT SUPPORTED OPERATION CODES is not supported */
+	sdev->no_report_opcodes = 1;
+
+	/* WRITE_SAME command is not supported */
+	sdev->no_write_same = 1;
+
+	ufshcd_set_queue_depth(sdev);
+
+	ufshcd_get_lu_power_on_wp_status(hba, sdev);
+
+	ufshcd_setup_links(hba, sdev);
+
+	return 0;
+}
+
+/**
+ * ufshcd_change_queue_depth - change queue depth
+ * @sdev: pointer to SCSI device
+ * @depth: required depth to set
+ *
+ * Change queue depth and make sure the max. limits are not crossed.
+ */
+static int ufshcd_change_queue_depth(struct scsi_device *sdev, int depth)
+{
+	return scsi_change_queue_depth(sdev, min(depth, sdev->host->can_queue));
+}
+
+static void ufshcd_hpb_destroy(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	/* skip well-known LU */
+	if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) ||
+	    !(hba->dev_info.hpb_enabled) || !ufshpb_is_allowed(hba))
+		return;
+
+	ufshpb_destroy_lu(hba, sdev);
+}
+
+static void ufshcd_hpb_configure(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	/* skip well-known LU */
+	if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) ||
+	    !(hba->dev_info.hpb_enabled) || !ufshpb_is_allowed(hba))
+		return;
+
+	ufshpb_init_hpb_lu(hba, sdev);
+}
+
+/**
+ * ufshcd_slave_configure - adjust SCSI device configurations
+ * @sdev: pointer to SCSI device
+ */
+static int ufshcd_slave_configure(struct scsi_device *sdev)
+{
+	struct ufs_hba *hba = shost_priv(sdev->host);
+	struct request_queue *q = sdev->request_queue;
+
+	ufshcd_hpb_configure(hba, sdev);
+
+	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
+	if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
+		blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
+	/*
+	 * Block runtime-pm until all consumers are added.
+	 * Refer ufshcd_setup_links().
+	 */
+	if (is_device_wlun(sdev))
+		pm_runtime_get_noresume(&sdev->sdev_gendev);
+	else if (ufshcd_is_rpm_autosuspend_allowed(hba))
+		sdev->rpm_autosuspend = 1;
+	/*
+	 * Do not print messages during runtime PM to avoid never-ending cycles
+	 * of messages written back to storage by user space causing runtime
+	 * resume, causing more messages and so on.
+	 */
+	sdev->silence_suspend = 1;
+
+	ufshcd_crypto_register(hba, q);
+
+	return 0;
+}
+
+/**
+ * ufshcd_slave_destroy - remove SCSI device configurations
+ * @sdev: pointer to SCSI device
+ */
+static void ufshcd_slave_destroy(struct scsi_device *sdev)
+{
+	struct ufs_hba *hba;
+	unsigned long flags;
+
+	hba = shost_priv(sdev->host);
+
+	ufshcd_hpb_destroy(hba, sdev);
+
+	/* Drop the reference as it won't be needed anymore */
+	if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) {
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		hba->ufs_device_wlun = NULL;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+	} else if (hba->ufs_device_wlun) {
+		struct device *supplier = NULL;
+
+		/* Ensure UFS Device WLUN exists and does not disappear */
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		if (hba->ufs_device_wlun) {
+			supplier = &hba->ufs_device_wlun->sdev_gendev;
+			get_device(supplier);
+		}
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+		if (supplier) {
+			/*
+			 * If a LUN fails to probe (e.g. absent BOOT WLUN), the
+			 * device will not have been registered but can still
+			 * have a device link holding a reference to the device.
+			 */
+			device_link_remove(&sdev->sdev_gendev, supplier);
+			put_device(supplier);
+		}
+	}
+}
+
+/**
+ * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status
+ * @lrbp: pointer to local reference block of completed command
+ * @scsi_status: SCSI command status
+ *
+ * Returns value base on SCSI command status
+ */
+static inline int
+ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
+{
+	int result = 0;
+
+	switch (scsi_status) {
+	case SAM_STAT_CHECK_CONDITION:
+		ufshcd_copy_sense_data(lrbp);
+		fallthrough;
+	case SAM_STAT_GOOD:
+		result |= DID_OK << 16 | scsi_status;
+		break;
+	case SAM_STAT_TASK_SET_FULL:
+	case SAM_STAT_BUSY:
+	case SAM_STAT_TASK_ABORTED:
+		ufshcd_copy_sense_data(lrbp);
+		result |= scsi_status;
+		break;
+	default:
+		result |= DID_ERROR << 16;
+		break;
+	} /* end of switch */
+
+	return result;
+}
+
+/**
+ * ufshcd_transfer_rsp_status - Get overall status of the response
+ * @hba: per adapter instance
+ * @lrbp: pointer to local reference block of completed command
+ *
+ * Returns result of the command to notify SCSI midlayer
+ */
+static inline int
+ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	int result = 0;
+	int scsi_status;
+	enum utp_ocs ocs;
+
+	/* overall command status of utrd */
+	ocs = ufshcd_get_tr_ocs(lrbp);
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_OCS_FATAL_ERROR) {
+		if (be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_1) &
+					MASK_RSP_UPIU_RESULT)
+			ocs = OCS_SUCCESS;
+	}
+
+	switch (ocs) {
+	case OCS_SUCCESS:
+		result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
+		hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
+		switch (result) {
+		case UPIU_TRANSACTION_RESPONSE:
+			/*
+			 * get the response UPIU result to extract
+			 * the SCSI command status
+			 */
+			result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);
+
+			/*
+			 * get the result based on SCSI status response
+			 * to notify the SCSI midlayer of the command status
+			 */
+			scsi_status = result & MASK_SCSI_STATUS;
+			result = ufshcd_scsi_cmd_status(lrbp, scsi_status);
+
+			/*
+			 * Currently we are only supporting BKOPs exception
+			 * events hence we can ignore BKOPs exception event
+			 * during power management callbacks. BKOPs exception
+			 * event is not expected to be raised in runtime suspend
+			 * callback as it allows the urgent bkops.
+			 * During system suspend, we are anyway forcefully
+			 * disabling the bkops and if urgent bkops is needed
+			 * it will be enabled on system resume. Long term
+			 * solution could be to abort the system suspend if
+			 * UFS device needs urgent BKOPs.
+			 */
+			if (!hba->pm_op_in_progress &&
+			    !ufshcd_eh_in_progress(hba) &&
+			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
+				/* Flushed in suspend */
+				schedule_work(&hba->eeh_work);
+
+			if (scsi_status == SAM_STAT_GOOD)
+				ufshpb_rsp_upiu(hba, lrbp);
+			break;
+		case UPIU_TRANSACTION_REJECT_UPIU:
+			/* TODO: handle Reject UPIU Response */
+			result = DID_ERROR << 16;
+			dev_err(hba->dev,
+				"Reject UPIU not fully implemented\n");
+			break;
+		default:
+			dev_err(hba->dev,
+				"Unexpected request response code = %x\n",
+				result);
+			result = DID_ERROR << 16;
+			break;
+		}
+		break;
+	case OCS_ABORTED:
+		result |= DID_ABORT << 16;
+		break;
+	case OCS_INVALID_COMMAND_STATUS:
+		result |= DID_REQUEUE << 16;
+		break;
+	case OCS_INVALID_CMD_TABLE_ATTR:
+	case OCS_INVALID_PRDT_ATTR:
+	case OCS_MISMATCH_DATA_BUF_SIZE:
+	case OCS_MISMATCH_RESP_UPIU_SIZE:
+	case OCS_PEER_COMM_FAILURE:
+	case OCS_FATAL_ERROR:
+	case OCS_DEVICE_FATAL_ERROR:
+	case OCS_INVALID_CRYPTO_CONFIG:
+	case OCS_GENERAL_CRYPTO_ERROR:
+	default:
+		result |= DID_ERROR << 16;
+		dev_err(hba->dev,
+				"OCS error from controller = %x for tag %d\n",
+				ocs, lrbp->task_tag);
+		ufshcd_print_evt_hist(hba);
+		ufshcd_print_host_state(hba);
+		break;
+	} /* end of switch */
+
+	if ((host_byte(result) != DID_OK) &&
+	    (host_byte(result) != DID_REQUEUE) && !hba->silence_err_logs)
+		ufshcd_print_trs(hba, 1 << lrbp->task_tag, true);
+	return result;
+}
+
+static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
+					 u32 intr_mask)
+{
+	if (!ufshcd_is_auto_hibern8_supported(hba) ||
+	    !ufshcd_is_auto_hibern8_enabled(hba))
+		return false;
+
+	if (!(intr_mask & UFSHCD_UIC_HIBERN8_MASK))
+		return false;
+
+	if (hba->active_uic_cmd &&
+	    (hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_ENTER ||
+	    hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_EXIT))
+		return false;
+
+	return true;
+}
+
+/**
+ * ufshcd_uic_cmd_compl - handle completion of uic command
+ * @hba: per adapter instance
+ * @intr_status: interrupt status generated by the controller
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
+{
+	irqreturn_t retval = IRQ_NONE;
+
+	spin_lock(hba->host->host_lock);
+	if (ufshcd_is_auto_hibern8_error(hba, intr_status))
+		hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status);
+
+	if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
+		hba->active_uic_cmd->argument2 |=
+			ufshcd_get_uic_cmd_result(hba);
+		hba->active_uic_cmd->argument3 =
+			ufshcd_get_dme_attr_val(hba);
+		if (!hba->uic_async_done)
+			hba->active_uic_cmd->cmd_active = 0;
+		complete(&hba->active_uic_cmd->done);
+		retval = IRQ_HANDLED;
+	}
+
+	if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) {
+		hba->active_uic_cmd->cmd_active = 0;
+		complete(hba->uic_async_done);
+		retval = IRQ_HANDLED;
+	}
+
+	if (retval == IRQ_HANDLED)
+		ufshcd_add_uic_command_trace(hba, hba->active_uic_cmd,
+					     UFS_CMD_COMP);
+	spin_unlock(hba->host->host_lock);
+	return retval;
+}
+
+/* Release the resources allocated for processing a SCSI command. */
+static void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
+				    struct ufshcd_lrb *lrbp)
+{
+	struct scsi_cmnd *cmd = lrbp->cmd;
+
+	scsi_dma_unmap(cmd);
+	lrbp->cmd = NULL;	/* Mark the command as completed. */
+	ufshcd_release(hba);
+	ufshcd_clk_scaling_update_busy(hba);
+}
+
+/**
+ * __ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * @hba: per adapter instance
+ * @completed_reqs: bitmask that indicates which requests to complete
+ */
+static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
+					unsigned long completed_reqs)
+{
+	struct ufshcd_lrb *lrbp;
+	struct scsi_cmnd *cmd;
+	int index;
+
+	for_each_set_bit(index, &completed_reqs, hba->nutrs) {
+		lrbp = &hba->lrb[index];
+		lrbp->compl_time_stamp = ktime_get();
+		cmd = lrbp->cmd;
+		if (cmd) {
+			if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
+				ufshcd_update_monitor(hba, lrbp);
+			ufshcd_add_command_trace(hba, index, UFS_CMD_COMP);
+			cmd->result = ufshcd_transfer_rsp_status(hba, lrbp);
+			ufshcd_release_scsi_cmd(hba, lrbp);
+			/* Do not touch lrbp after scsi done */
+			scsi_done(cmd);
+		} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
+			lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
+			if (hba->dev_cmd.complete) {
+				ufshcd_add_command_trace(hba, index,
+							 UFS_DEV_COMP);
+				complete(hba->dev_cmd.complete);
+				ufshcd_clk_scaling_update_busy(hba);
+			}
+		}
+	}
+}
+
+/*
+ * Returns > 0 if one or more commands have been completed or 0 if no
+ * requests have been completed.
+ */
+static int ufshcd_poll(struct Scsi_Host *shost, unsigned int queue_num)
+{
+	struct ufs_hba *hba = shost_priv(shost);
+	unsigned long completed_reqs, flags;
+	u32 tr_doorbell;
+
+	spin_lock_irqsave(&hba->outstanding_lock, flags);
+	tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+	completed_reqs = ~tr_doorbell & hba->outstanding_reqs;
+	WARN_ONCE(completed_reqs & ~hba->outstanding_reqs,
+		  "completed: %#lx; outstanding: %#lx\n", completed_reqs,
+		  hba->outstanding_reqs);
+	hba->outstanding_reqs &= ~completed_reqs;
+	spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+
+	if (completed_reqs)
+		__ufshcd_transfer_req_compl(hba, completed_reqs);
+
+	return completed_reqs;
+}
+
+/**
+ * ufshcd_transfer_req_compl - handle SCSI and query command completion
+ * @hba: per adapter instance
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
+{
+	/* Resetting interrupt aggregation counters first and reading the
+	 * DOOR_BELL afterward allows us to handle all the completed requests.
+	 * In order to prevent other interrupts starvation the DB is read once
+	 * after reset. The down side of this solution is the possibility of
+	 * false interrupt if device completes another request after resetting
+	 * aggregation and before reading the DB.
+	 */
+	if (ufshcd_is_intr_aggr_allowed(hba) &&
+	    !(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
+		ufshcd_reset_intr_aggr(hba);
+
+	if (ufs_fail_completion())
+		return IRQ_HANDLED;
+
+	/*
+	 * Ignore the ufshcd_poll() return value and return IRQ_HANDLED since we
+	 * do not want polling to trigger spurious interrupt complaints.
+	 */
+	ufshcd_poll(hba->host, 0);
+
+	return IRQ_HANDLED;
+}
+
+int __ufshcd_write_ee_control(struct ufs_hba *hba, u32 ee_ctrl_mask)
+{
+	return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+				       QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
+				       &ee_ctrl_mask);
+}
+
+int ufshcd_write_ee_control(struct ufs_hba *hba)
+{
+	int err;
+
+	mutex_lock(&hba->ee_ctrl_mutex);
+	err = __ufshcd_write_ee_control(hba, hba->ee_ctrl_mask);
+	mutex_unlock(&hba->ee_ctrl_mutex);
+	if (err)
+		dev_err(hba->dev, "%s: failed to write ee control %d\n",
+			__func__, err);
+	return err;
+}
+
+int ufshcd_update_ee_control(struct ufs_hba *hba, u16 *mask, u16 *other_mask,
+			     u16 set, u16 clr)
+{
+	u16 new_mask, ee_ctrl_mask;
+	int err = 0;
+
+	mutex_lock(&hba->ee_ctrl_mutex);
+	new_mask = (*mask & ~clr) | set;
+	ee_ctrl_mask = new_mask | *other_mask;
+	if (ee_ctrl_mask != hba->ee_ctrl_mask)
+		err = __ufshcd_write_ee_control(hba, ee_ctrl_mask);
+	/* Still need to update 'mask' even if 'ee_ctrl_mask' was unchanged */
+	if (!err) {
+		hba->ee_ctrl_mask = ee_ctrl_mask;
+		*mask = new_mask;
+	}
+	mutex_unlock(&hba->ee_ctrl_mutex);
+	return err;
+}
+
+/**
+ * ufshcd_disable_ee - disable exception event
+ * @hba: per-adapter instance
+ * @mask: exception event to disable
+ *
+ * Disables exception event in the device so that the EVENT_ALERT
+ * bit is not set.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static inline int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
+{
+	return ufshcd_update_ee_drv_mask(hba, 0, mask);
+}
+
+/**
+ * ufshcd_enable_ee - enable exception event
+ * @hba: per-adapter instance
+ * @mask: exception event to enable
+ *
+ * Enable corresponding exception event in the device to allow
+ * device to alert host in critical scenarios.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static inline int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
+{
+	return ufshcd_update_ee_drv_mask(hba, mask, 0);
+}
+
+/**
+ * ufshcd_enable_auto_bkops - Allow device managed BKOPS
+ * @hba: per-adapter instance
+ *
+ * Allow device to manage background operations on its own. Enabling
+ * this might lead to inconsistent latencies during normal data transfers
+ * as the device is allowed to manage its own way of handling background
+ * operations.
+ *
+ * Returns zero on success, non-zero on failure.
+ */
+static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
+{
+	int err = 0;
+
+	if (hba->auto_bkops_enabled)
+		goto out;
+
+	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+			QUERY_FLAG_IDN_BKOPS_EN, 0, NULL);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to enable bkops %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	hba->auto_bkops_enabled = true;
+	trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Enabled");
+
+	/* No need of URGENT_BKOPS exception from the device */
+	err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
+	if (err)
+		dev_err(hba->dev, "%s: failed to disable exception event %d\n",
+				__func__, err);
+out:
+	return err;
+}
+
+/**
+ * ufshcd_disable_auto_bkops - block device in doing background operations
+ * @hba: per-adapter instance
+ *
+ * Disabling background operations improves command response latency but
+ * has drawback of device moving into critical state where the device is
+ * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
+ * host is idle so that BKOPS are managed effectively without any negative
+ * impacts.
+ *
+ * Returns zero on success, non-zero on failure.
+ */
+static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
+{
+	int err = 0;
+
+	if (!hba->auto_bkops_enabled)
+		goto out;
+
+	/*
+	 * If host assisted BKOPs is to be enabled, make sure
+	 * urgent bkops exception is allowed.
+	 */
+	err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to enable exception event %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
+			QUERY_FLAG_IDN_BKOPS_EN, 0, NULL);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to disable bkops %d\n",
+				__func__, err);
+		ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
+		goto out;
+	}
+
+	hba->auto_bkops_enabled = false;
+	trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Disabled");
+	hba->is_urgent_bkops_lvl_checked = false;
+out:
+	return err;
+}
+
+/**
+ * ufshcd_force_reset_auto_bkops - force reset auto bkops state
+ * @hba: per adapter instance
+ *
+ * After a device reset the device may toggle the BKOPS_EN flag
+ * to default value. The s/w tracking variables should be updated
+ * as well. This function would change the auto-bkops state based on
+ * UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND.
+ */
+static void ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
+{
+	if (ufshcd_keep_autobkops_enabled_except_suspend(hba)) {
+		hba->auto_bkops_enabled = false;
+		hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
+		ufshcd_enable_auto_bkops(hba);
+	} else {
+		hba->auto_bkops_enabled = true;
+		hba->ee_ctrl_mask &= ~MASK_EE_URGENT_BKOPS;
+		ufshcd_disable_auto_bkops(hba);
+	}
+	hba->urgent_bkops_lvl = BKOPS_STATUS_PERF_IMPACT;
+	hba->is_urgent_bkops_lvl_checked = false;
+}
+
+static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
+{
+	return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+			QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
+}
+
+/**
+ * ufshcd_bkops_ctrl - control the auto bkops based on current bkops status
+ * @hba: per-adapter instance
+ * @status: bkops_status value
+ *
+ * Read the bkops_status from the UFS device and Enable fBackgroundOpsEn
+ * flag in the device to permit background operations if the device
+ * bkops_status is greater than or equal to "status" argument passed to
+ * this function, disable otherwise.
+ *
+ * Returns 0 for success, non-zero in case of failure.
+ *
+ * NOTE: Caller of this function can check the "hba->auto_bkops_enabled" flag
+ * to know whether auto bkops is enabled or disabled after this function
+ * returns control to it.
+ */
+static int ufshcd_bkops_ctrl(struct ufs_hba *hba,
+			     enum bkops_status status)
+{
+	int err;
+	u32 curr_status = 0;
+
+	err = ufshcd_get_bkops_status(hba, &curr_status);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
+				__func__, err);
+		goto out;
+	} else if (curr_status > BKOPS_STATUS_MAX) {
+		dev_err(hba->dev, "%s: invalid BKOPS status %d\n",
+				__func__, curr_status);
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (curr_status >= status)
+		err = ufshcd_enable_auto_bkops(hba);
+	else
+		err = ufshcd_disable_auto_bkops(hba);
+out:
+	return err;
+}
+
+/**
+ * ufshcd_urgent_bkops - handle urgent bkops exception event
+ * @hba: per-adapter instance
+ *
+ * Enable fBackgroundOpsEn flag in the device to permit background
+ * operations.
+ *
+ * If BKOPs is enabled, this function returns 0, 1 if the bkops in not enabled
+ * and negative error value for any other failure.
+ */
+static int ufshcd_urgent_bkops(struct ufs_hba *hba)
+{
+	return ufshcd_bkops_ctrl(hba, hba->urgent_bkops_lvl);
+}
+
+static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
+{
+	return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+			QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
+}
+
+static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
+{
+	int err;
+	u32 curr_status = 0;
+
+	if (hba->is_urgent_bkops_lvl_checked)
+		goto enable_auto_bkops;
+
+	err = ufshcd_get_bkops_status(hba, &curr_status);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	/*
+	 * We are seeing that some devices are raising the urgent bkops
+	 * exception events even when BKOPS status doesn't indicate performace
+	 * impacted or critical. Handle these device by determining their urgent
+	 * bkops status at runtime.
+	 */
+	if (curr_status < BKOPS_STATUS_PERF_IMPACT) {
+		dev_err(hba->dev, "%s: device raised urgent BKOPS exception for bkops status %d\n",
+				__func__, curr_status);
+		/* update the current status as the urgent bkops level */
+		hba->urgent_bkops_lvl = curr_status;
+		hba->is_urgent_bkops_lvl_checked = true;
+	}
+
+enable_auto_bkops:
+	err = ufshcd_enable_auto_bkops(hba);
+out:
+	if (err < 0)
+		dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
+				__func__, err);
+}
+
+static void ufshcd_temp_exception_event_handler(struct ufs_hba *hba, u16 status)
+{
+	u32 value;
+
+	if (ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+				QUERY_ATTR_IDN_CASE_ROUGH_TEMP, 0, 0, &value))
+		return;
+
+	dev_info(hba->dev, "exception Tcase %d\n", value - 80);
+
+	ufs_hwmon_notify_event(hba, status & MASK_EE_URGENT_TEMP);
+
+	/*
+	 * A placeholder for the platform vendors to add whatever additional
+	 * steps required
+	 */
+}
+
+static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn idn)
+{
+	u8 index;
+	enum query_opcode opcode = set ? UPIU_QUERY_OPCODE_SET_FLAG :
+				   UPIU_QUERY_OPCODE_CLEAR_FLAG;
+
+	index = ufshcd_wb_get_query_index(hba);
+	return ufshcd_query_flag_retry(hba, opcode, idn, index, NULL);
+}
+
+int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable)
+{
+	int ret;
+
+	if (!ufshcd_is_wb_allowed(hba))
+		return 0;
+
+	if (!(enable ^ hba->dev_info.wb_enabled))
+		return 0;
+
+	ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_EN);
+	if (ret) {
+		dev_err(hba->dev, "%s Write Booster %s failed %d\n",
+			__func__, enable ? "enable" : "disable", ret);
+		return ret;
+	}
+
+	hba->dev_info.wb_enabled = enable;
+	dev_info(hba->dev, "%s Write Booster %s\n",
+			__func__, enable ? "enabled" : "disabled");
+
+	return ret;
+}
+
+static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
+{
+	int ret;
+
+	ret = __ufshcd_wb_toggle(hba, set,
+			QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8);
+	if (ret) {
+		dev_err(hba->dev, "%s: WB-Buf Flush during H8 %s failed: %d\n",
+			__func__, set ? "enable" : "disable", ret);
+		return;
+	}
+	dev_dbg(hba->dev, "%s WB-Buf Flush during H8 %s\n",
+			__func__, set ? "enabled" : "disabled");
+}
+
+static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
+{
+	int ret;
+
+	if (!ufshcd_is_wb_allowed(hba) ||
+	    hba->dev_info.wb_buf_flush_enabled == enable)
+		return;
+
+	ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN);
+	if (ret) {
+		dev_err(hba->dev, "%s WB-Buf Flush %s failed %d\n", __func__,
+			enable ? "enable" : "disable", ret);
+		return;
+	}
+
+	hba->dev_info.wb_buf_flush_enabled = enable;
+
+	dev_dbg(hba->dev, "%s WB-Buf Flush %s\n",
+			__func__, enable ? "enabled" : "disabled");
+}
+
+static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
+						u32 avail_buf)
+{
+	u32 cur_buf;
+	int ret;
+	u8 index;
+
+	index = ufshcd_wb_get_query_index(hba);
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+					      QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE,
+					      index, 0, &cur_buf);
+	if (ret) {
+		dev_err(hba->dev, "%s dCurWriteBoosterBufferSize read failed %d\n",
+			__func__, ret);
+		return false;
+	}
+
+	if (!cur_buf) {
+		dev_info(hba->dev, "dCurWBBuf: %d WB disabled until free-space is available\n",
+			 cur_buf);
+		return false;
+	}
+	/* Let it continue to flush when available buffer exceeds threshold */
+	return avail_buf < hba->vps->wb_flush_threshold;
+}
+
+static void ufshcd_wb_force_disable(struct ufs_hba *hba)
+{
+	if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
+		ufshcd_wb_toggle_flush(hba, false);
+
+	ufshcd_wb_toggle_flush_during_h8(hba, false);
+	ufshcd_wb_toggle(hba, false);
+	hba->caps &= ~UFSHCD_CAP_WB_EN;
+
+	dev_info(hba->dev, "%s: WB force disabled\n", __func__);
+}
+
+static bool ufshcd_is_wb_buf_lifetime_available(struct ufs_hba *hba)
+{
+	u32 lifetime;
+	int ret;
+	u8 index;
+
+	index = ufshcd_wb_get_query_index(hba);
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+				      QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST,
+				      index, 0, &lifetime);
+	if (ret) {
+		dev_err(hba->dev,
+			"%s: bWriteBoosterBufferLifeTimeEst read failed %d\n",
+			__func__, ret);
+		return false;
+	}
+
+	if (lifetime == UFS_WB_EXCEED_LIFETIME) {
+		dev_err(hba->dev, "%s: WB buf lifetime is exhausted 0x%02X\n",
+			__func__, lifetime);
+		return false;
+	}
+
+	dev_dbg(hba->dev, "%s: WB buf lifetime is 0x%02X\n",
+		__func__, lifetime);
+
+	return true;
+}
+
+static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
+{
+	int ret;
+	u32 avail_buf;
+	u8 index;
+
+	if (!ufshcd_is_wb_allowed(hba))
+		return false;
+
+	if (!ufshcd_is_wb_buf_lifetime_available(hba)) {
+		ufshcd_wb_force_disable(hba);
+		return false;
+	}
+
+	/*
+	 * The ufs device needs the vcc to be ON to flush.
+	 * With user-space reduction enabled, it's enough to enable flush
+	 * by checking only the available buffer. The threshold
+	 * defined here is > 90% full.
+	 * With user-space preserved enabled, the current-buffer
+	 * should be checked too because the wb buffer size can reduce
+	 * when disk tends to be full. This info is provided by current
+	 * buffer (dCurrentWriteBoosterBufferSize). There's no point in
+	 * keeping vcc on when current buffer is empty.
+	 */
+	index = ufshcd_wb_get_query_index(hba);
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+				      QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE,
+				      index, 0, &avail_buf);
+	if (ret) {
+		dev_warn(hba->dev, "%s dAvailableWriteBoosterBufferSize read failed %d\n",
+			 __func__, ret);
+		return false;
+	}
+
+	if (!hba->dev_info.b_presrv_uspc_en)
+		return avail_buf <= UFS_WB_BUF_REMAIN_PERCENT(10);
+
+	return ufshcd_wb_presrv_usrspc_keep_vcc_on(hba, avail_buf);
+}
+
+static void ufshcd_rpm_dev_flush_recheck_work(struct work_struct *work)
+{
+	struct ufs_hba *hba = container_of(to_delayed_work(work),
+					   struct ufs_hba,
+					   rpm_dev_flush_recheck_work);
+	/*
+	 * To prevent unnecessary VCC power drain after device finishes
+	 * WriteBooster buffer flush or Auto BKOPs, force runtime resume
+	 * after a certain delay to recheck the threshold by next runtime
+	 * suspend.
+	 */
+	ufshcd_rpm_get_sync(hba);
+	ufshcd_rpm_put_sync(hba);
+}
+
+/**
+ * ufshcd_exception_event_handler - handle exceptions raised by device
+ * @work: pointer to work data
+ *
+ * Read bExceptionEventStatus attribute from the device and handle the
+ * exception event accordingly.
+ */
+static void ufshcd_exception_event_handler(struct work_struct *work)
+{
+	struct ufs_hba *hba;
+	int err;
+	u32 status = 0;
+	hba = container_of(work, struct ufs_hba, eeh_work);
+
+	ufshcd_scsi_block_requests(hba);
+	err = ufshcd_get_ee_status(hba, &status);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to get exception status %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	trace_ufshcd_exception_event(dev_name(hba->dev), status);
+
+	if (status & hba->ee_drv_mask & MASK_EE_URGENT_BKOPS)
+		ufshcd_bkops_exception_event_handler(hba);
+
+	if (status & hba->ee_drv_mask & MASK_EE_URGENT_TEMP)
+		ufshcd_temp_exception_event_handler(hba, status);
+
+	ufs_debugfs_exception_event(hba, status);
+out:
+	ufshcd_scsi_unblock_requests(hba);
+}
+
+/* Complete requests that have door-bell cleared */
+static void ufshcd_complete_requests(struct ufs_hba *hba)
+{
+	ufshcd_transfer_req_compl(hba);
+	ufshcd_tmc_handler(hba);
+}
+
+/**
+ * ufshcd_quirk_dl_nac_errors - This function checks if error handling is
+ *				to recover from the DL NAC errors or not.
+ * @hba: per-adapter instance
+ *
+ * Returns true if error handling is required, false otherwise
+ */
+static bool ufshcd_quirk_dl_nac_errors(struct ufs_hba *hba)
+{
+	unsigned long flags;
+	bool err_handling = true;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	/*
+	 * UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS only workaround the
+	 * device fatal error and/or DL NAC & REPLAY timeout errors.
+	 */
+	if (hba->saved_err & (CONTROLLER_FATAL_ERROR | SYSTEM_BUS_FATAL_ERROR))
+		goto out;
+
+	if ((hba->saved_err & DEVICE_FATAL_ERROR) ||
+	    ((hba->saved_err & UIC_ERROR) &&
+	     (hba->saved_uic_err & UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))
+		goto out;
+
+	if ((hba->saved_err & UIC_ERROR) &&
+	    (hba->saved_uic_err & UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)) {
+		int err;
+		/*
+		 * wait for 50ms to see if we can get any other errors or not.
+		 */
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		msleep(50);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+
+		/*
+		 * now check if we have got any other severe errors other than
+		 * DL NAC error?
+		 */
+		if ((hba->saved_err & INT_FATAL_ERRORS) ||
+		    ((hba->saved_err & UIC_ERROR) &&
+		    (hba->saved_uic_err & ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)))
+			goto out;
+
+		/*
+		 * As DL NAC is the only error received so far, send out NOP
+		 * command to confirm if link is still active or not.
+		 *   - If we don't get any response then do error recovery.
+		 *   - If we get response then clear the DL NAC error bit.
+		 */
+
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		err = ufshcd_verify_dev_init(hba);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+
+		if (err)
+			goto out;
+
+		/* Link seems to be alive hence ignore the DL NAC errors */
+		if (hba->saved_uic_err == UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)
+			hba->saved_err &= ~UIC_ERROR;
+		/* clear NAC error */
+		hba->saved_uic_err &= ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
+		if (!hba->saved_uic_err)
+			err_handling = false;
+	}
+out:
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	return err_handling;
+}
+
+/* host lock must be held before calling this func */
+static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba)
+{
+	return (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR) ||
+	       (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK));
+}
+
+void ufshcd_schedule_eh_work(struct ufs_hba *hba)
+{
+	lockdep_assert_held(hba->host->host_lock);
+
+	/* handle fatal errors only when link is not in error state */
+	if (hba->ufshcd_state != UFSHCD_STATE_ERROR) {
+		if (hba->force_reset || ufshcd_is_link_broken(hba) ||
+		    ufshcd_is_saved_err_fatal(hba))
+			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_FATAL;
+		else
+			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED_NON_FATAL;
+		queue_work(hba->eh_wq, &hba->eh_work);
+	}
+}
+
+static void ufshcd_clk_scaling_allow(struct ufs_hba *hba, bool allow)
+{
+	down_write(&hba->clk_scaling_lock);
+	hba->clk_scaling.is_allowed = allow;
+	up_write(&hba->clk_scaling_lock);
+}
+
+static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend)
+{
+	if (suspend) {
+		if (hba->clk_scaling.is_enabled)
+			ufshcd_suspend_clkscaling(hba);
+		ufshcd_clk_scaling_allow(hba, false);
+	} else {
+		ufshcd_clk_scaling_allow(hba, true);
+		if (hba->clk_scaling.is_enabled)
+			ufshcd_resume_clkscaling(hba);
+	}
+}
+
+static void ufshcd_err_handling_prepare(struct ufs_hba *hba)
+{
+	ufshcd_rpm_get_sync(hba);
+	if (pm_runtime_status_suspended(&hba->ufs_device_wlun->sdev_gendev) ||
+	    hba->is_sys_suspended) {
+		enum ufs_pm_op pm_op;
+
+		/*
+		 * Don't assume anything of resume, if
+		 * resume fails, irq and clocks can be OFF, and powers
+		 * can be OFF or in LPM.
+		 */
+		ufshcd_setup_hba_vreg(hba, true);
+		ufshcd_enable_irq(hba);
+		ufshcd_setup_vreg(hba, true);
+		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
+		ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
+		ufshcd_hold(hba, false);
+		if (!ufshcd_is_clkgating_allowed(hba))
+			ufshcd_setup_clocks(hba, true);
+		ufshcd_release(hba);
+		pm_op = hba->is_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
+		ufshcd_vops_resume(hba, pm_op);
+	} else {
+		ufshcd_hold(hba, false);
+		if (ufshcd_is_clkscaling_supported(hba) &&
+		    hba->clk_scaling.is_enabled)
+			ufshcd_suspend_clkscaling(hba);
+		ufshcd_clk_scaling_allow(hba, false);
+	}
+	ufshcd_scsi_block_requests(hba);
+	/* Drain ufshcd_queuecommand() */
+	synchronize_rcu();
+	cancel_work_sync(&hba->eeh_work);
+}
+
+static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
+{
+	ufshcd_scsi_unblock_requests(hba);
+	ufshcd_release(hba);
+	if (ufshcd_is_clkscaling_supported(hba))
+		ufshcd_clk_scaling_suspend(hba, false);
+	ufshcd_rpm_put(hba);
+}
+
+static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
+{
+	return (!hba->is_powered || hba->shutting_down ||
+		!hba->ufs_device_wlun ||
+		hba->ufshcd_state == UFSHCD_STATE_ERROR ||
+		(!(hba->saved_err || hba->saved_uic_err || hba->force_reset ||
+		   ufshcd_is_link_broken(hba))));
+}
+
+#ifdef CONFIG_PM
+static void ufshcd_recover_pm_error(struct ufs_hba *hba)
+{
+	struct Scsi_Host *shost = hba->host;
+	struct scsi_device *sdev;
+	struct request_queue *q;
+	int ret;
+
+	hba->is_sys_suspended = false;
+	/*
+	 * Set RPM status of wlun device to RPM_ACTIVE,
+	 * this also clears its runtime error.
+	 */
+	ret = pm_runtime_set_active(&hba->ufs_device_wlun->sdev_gendev);
+
+	/* hba device might have a runtime error otherwise */
+	if (ret)
+		ret = pm_runtime_set_active(hba->dev);
+	/*
+	 * If wlun device had runtime error, we also need to resume those
+	 * consumer scsi devices in case any of them has failed to be
+	 * resumed due to supplier runtime resume failure. This is to unblock
+	 * blk_queue_enter in case there are bios waiting inside it.
+	 */
+	if (!ret) {
+		shost_for_each_device(sdev, shost) {
+			q = sdev->request_queue;
+			if (q->dev && (q->rpm_status == RPM_SUSPENDED ||
+				       q->rpm_status == RPM_SUSPENDING))
+				pm_request_resume(q->dev);
+		}
+	}
+}
+#else
+static inline void ufshcd_recover_pm_error(struct ufs_hba *hba)
+{
+}
+#endif
+
+static bool ufshcd_is_pwr_mode_restore_needed(struct ufs_hba *hba)
+{
+	struct ufs_pa_layer_attr *pwr_info = &hba->pwr_info;
+	u32 mode;
+
+	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PWRMODE), &mode);
+
+	if (pwr_info->pwr_rx != ((mode >> PWRMODE_RX_OFFSET) & PWRMODE_MASK))
+		return true;
+
+	if (pwr_info->pwr_tx != (mode & PWRMODE_MASK))
+		return true;
+
+	return false;
+}
+
+/**
+ * ufshcd_err_handler - handle UFS errors that require s/w attention
+ * @work: pointer to work structure
+ */
+static void ufshcd_err_handler(struct work_struct *work)
+{
+	int retries = MAX_ERR_HANDLER_RETRIES;
+	struct ufs_hba *hba;
+	unsigned long flags;
+	bool needs_restore;
+	bool needs_reset;
+	bool err_xfer;
+	bool err_tm;
+	int pmc_err;
+	int tag;
+
+	hba = container_of(work, struct ufs_hba, eh_work);
+
+	dev_info(hba->dev,
+		 "%s started; HBA state %s; powered %d; shutting down %d; saved_err = %d; saved_uic_err = %d; force_reset = %d%s\n",
+		 __func__, ufshcd_state_name[hba->ufshcd_state],
+		 hba->is_powered, hba->shutting_down, hba->saved_err,
+		 hba->saved_uic_err, hba->force_reset,
+		 ufshcd_is_link_broken(hba) ? "; link is broken" : "");
+
+	down(&hba->host_sem);
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (ufshcd_err_handling_should_stop(hba)) {
+		if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
+			hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		up(&hba->host_sem);
+		return;
+	}
+	ufshcd_set_eh_in_progress(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	ufshcd_err_handling_prepare(hba);
+	/* Complete requests that have door-bell cleared by h/w */
+	ufshcd_complete_requests(hba);
+	spin_lock_irqsave(hba->host->host_lock, flags);
+again:
+	needs_restore = false;
+	needs_reset = false;
+	err_xfer = false;
+	err_tm = false;
+
+	if (hba->ufshcd_state != UFSHCD_STATE_ERROR)
+		hba->ufshcd_state = UFSHCD_STATE_RESET;
+	/*
+	 * A full reset and restore might have happened after preparation
+	 * is finished, double check whether we should stop.
+	 */
+	if (ufshcd_err_handling_should_stop(hba))
+		goto skip_err_handling;
+
+	if (hba->dev_quirks & UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
+		bool ret;
+
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		/* release the lock as ufshcd_quirk_dl_nac_errors() may sleep */
+		ret = ufshcd_quirk_dl_nac_errors(hba);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		if (!ret && ufshcd_err_handling_should_stop(hba))
+			goto skip_err_handling;
+	}
+
+	if ((hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK)) ||
+	    (hba->saved_uic_err &&
+	     (hba->saved_uic_err != UFSHCD_UIC_PA_GENERIC_ERROR))) {
+		bool pr_prdt = !!(hba->saved_err & SYSTEM_BUS_FATAL_ERROR);
+
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		ufshcd_print_host_state(hba);
+		ufshcd_print_pwr_info(hba);
+		ufshcd_print_evt_hist(hba);
+		ufshcd_print_tmrs(hba, hba->outstanding_tasks);
+		ufshcd_print_trs(hba, hba->outstanding_reqs, pr_prdt);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+	}
+
+	/*
+	 * if host reset is required then skip clearing the pending
+	 * transfers forcefully because they will get cleared during
+	 * host reset and restore
+	 */
+	if (hba->force_reset || ufshcd_is_link_broken(hba) ||
+	    ufshcd_is_saved_err_fatal(hba) ||
+	    ((hba->saved_err & UIC_ERROR) &&
+	     (hba->saved_uic_err & (UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
+				    UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))) {
+		needs_reset = true;
+		goto do_reset;
+	}
+
+	/*
+	 * If LINERESET was caught, UFS might have been put to PWM mode,
+	 * check if power mode restore is needed.
+	 */
+	if (hba->saved_uic_err & UFSHCD_UIC_PA_GENERIC_ERROR) {
+		hba->saved_uic_err &= ~UFSHCD_UIC_PA_GENERIC_ERROR;
+		if (!hba->saved_uic_err)
+			hba->saved_err &= ~UIC_ERROR;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		if (ufshcd_is_pwr_mode_restore_needed(hba))
+			needs_restore = true;
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		if (!hba->saved_err && !needs_restore)
+			goto skip_err_handling;
+	}
+
+	hba->silence_err_logs = true;
+	/* release lock as clear command might sleep */
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	/* Clear pending transfer requests */
+	for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
+		if (ufshcd_try_to_abort_task(hba, tag)) {
+			err_xfer = true;
+			goto lock_skip_pending_xfer_clear;
+		}
+		dev_err(hba->dev, "Aborted tag %d / CDB %#02x\n", tag,
+			hba->lrb[tag].cmd ? hba->lrb[tag].cmd->cmnd[0] : -1);
+	}
+
+	/* Clear pending task management requests */
+	for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs) {
+		if (ufshcd_clear_tm_cmd(hba, tag)) {
+			err_tm = true;
+			goto lock_skip_pending_xfer_clear;
+		}
+	}
+
+lock_skip_pending_xfer_clear:
+	/* Complete the requests that are cleared by s/w */
+	ufshcd_complete_requests(hba);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->silence_err_logs = false;
+	if (err_xfer || err_tm) {
+		needs_reset = true;
+		goto do_reset;
+	}
+
+	/*
+	 * After all reqs and tasks are cleared from doorbell,
+	 * now it is safe to retore power mode.
+	 */
+	if (needs_restore) {
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		/*
+		 * Hold the scaling lock just in case dev cmds
+		 * are sent via bsg and/or sysfs.
+		 */
+		down_write(&hba->clk_scaling_lock);
+		hba->force_pmc = true;
+		pmc_err = ufshcd_config_pwr_mode(hba, &(hba->pwr_info));
+		if (pmc_err) {
+			needs_reset = true;
+			dev_err(hba->dev, "%s: Failed to restore power mode, err = %d\n",
+					__func__, pmc_err);
+		}
+		hba->force_pmc = false;
+		ufshcd_print_pwr_info(hba);
+		up_write(&hba->clk_scaling_lock);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+	}
+
+do_reset:
+	/* Fatal errors need reset */
+	if (needs_reset) {
+		int err;
+
+		hba->force_reset = false;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+		err = ufshcd_reset_and_restore(hba);
+		if (err)
+			dev_err(hba->dev, "%s: reset and restore failed with err %d\n",
+					__func__, err);
+		else
+			ufshcd_recover_pm_error(hba);
+		spin_lock_irqsave(hba->host->host_lock, flags);
+	}
+
+skip_err_handling:
+	if (!needs_reset) {
+		if (hba->ufshcd_state == UFSHCD_STATE_RESET)
+			hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
+		if (hba->saved_err || hba->saved_uic_err)
+			dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x saved_uic_err 0x%x",
+			    __func__, hba->saved_err, hba->saved_uic_err);
+	}
+	/* Exit in an operational state or dead */
+	if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL &&
+	    hba->ufshcd_state != UFSHCD_STATE_ERROR) {
+		if (--retries)
+			goto again;
+		hba->ufshcd_state = UFSHCD_STATE_ERROR;
+	}
+	ufshcd_clear_eh_in_progress(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	ufshcd_err_handling_unprepare(hba);
+	up(&hba->host_sem);
+
+	dev_info(hba->dev, "%s finished; HBA state %s\n", __func__,
+		 ufshcd_state_name[hba->ufshcd_state]);
+}
+
+/**
+ * ufshcd_update_uic_error - check and set fatal UIC error flags.
+ * @hba: per-adapter instance
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_update_uic_error(struct ufs_hba *hba)
+{
+	u32 reg;
+	irqreturn_t retval = IRQ_NONE;
+
+	/* PHY layer error */
+	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
+	if ((reg & UIC_PHY_ADAPTER_LAYER_ERROR) &&
+	    (reg & UIC_PHY_ADAPTER_LAYER_ERROR_CODE_MASK)) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_PA_ERR, reg);
+		/*
+		 * To know whether this error is fatal or not, DB timeout
+		 * must be checked but this error is handled separately.
+		 */
+		if (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)
+			dev_dbg(hba->dev, "%s: UIC Lane error reported\n",
+					__func__);
+
+		/* Got a LINERESET indication. */
+		if (reg & UIC_PHY_ADAPTER_LAYER_GENERIC_ERROR) {
+			struct uic_command *cmd = NULL;
+
+			hba->uic_error |= UFSHCD_UIC_PA_GENERIC_ERROR;
+			if (hba->uic_async_done && hba->active_uic_cmd)
+				cmd = hba->active_uic_cmd;
+			/*
+			 * Ignore the LINERESET during power mode change
+			 * operation via DME_SET command.
+			 */
+			if (cmd && (cmd->command == UIC_CMD_DME_SET))
+				hba->uic_error &= ~UFSHCD_UIC_PA_GENERIC_ERROR;
+		}
+		retval |= IRQ_HANDLED;
+	}
+
+	/* PA_INIT_ERROR is fatal and needs UIC reset */
+	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
+	if ((reg & UIC_DATA_LINK_LAYER_ERROR) &&
+	    (reg & UIC_DATA_LINK_LAYER_ERROR_CODE_MASK)) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_DL_ERR, reg);
+
+		if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
+			hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
+		else if (hba->dev_quirks &
+				UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
+			if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED)
+				hba->uic_error |=
+					UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
+			else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT)
+				hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR;
+		}
+		retval |= IRQ_HANDLED;
+	}
+
+	/* UIC NL/TL/DME errors needs software retry */
+	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
+	if ((reg & UIC_NETWORK_LAYER_ERROR) &&
+	    (reg & UIC_NETWORK_LAYER_ERROR_CODE_MASK)) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_NL_ERR, reg);
+		hba->uic_error |= UFSHCD_UIC_NL_ERROR;
+		retval |= IRQ_HANDLED;
+	}
+
+	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
+	if ((reg & UIC_TRANSPORT_LAYER_ERROR) &&
+	    (reg & UIC_TRANSPORT_LAYER_ERROR_CODE_MASK)) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_TL_ERR, reg);
+		hba->uic_error |= UFSHCD_UIC_TL_ERROR;
+		retval |= IRQ_HANDLED;
+	}
+
+	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
+	if ((reg & UIC_DME_ERROR) &&
+	    (reg & UIC_DME_ERROR_CODE_MASK)) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_DME_ERR, reg);
+		hba->uic_error |= UFSHCD_UIC_DME_ERROR;
+		retval |= IRQ_HANDLED;
+	}
+
+	dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
+			__func__, hba->uic_error);
+	return retval;
+}
+
+/**
+ * ufshcd_check_errors - Check for errors that need s/w attention
+ * @hba: per-adapter instance
+ * @intr_status: interrupt status generated by the controller
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba, u32 intr_status)
+{
+	bool queue_eh_work = false;
+	irqreturn_t retval = IRQ_NONE;
+
+	spin_lock(hba->host->host_lock);
+	hba->errors |= UFSHCD_ERROR_MASK & intr_status;
+
+	if (hba->errors & INT_FATAL_ERRORS) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_FATAL_ERR,
+				       hba->errors);
+		queue_eh_work = true;
+	}
+
+	if (hba->errors & UIC_ERROR) {
+		hba->uic_error = 0;
+		retval = ufshcd_update_uic_error(hba);
+		if (hba->uic_error)
+			queue_eh_work = true;
+	}
+
+	if (hba->errors & UFSHCD_UIC_HIBERN8_MASK) {
+		dev_err(hba->dev,
+			"%s: Auto Hibern8 %s failed - status: 0x%08x, upmcrs: 0x%08x\n",
+			__func__, (hba->errors & UIC_HIBERNATE_ENTER) ?
+			"Enter" : "Exit",
+			hba->errors, ufshcd_get_upmcrs(hba));
+		ufshcd_update_evt_hist(hba, UFS_EVT_AUTO_HIBERN8_ERR,
+				       hba->errors);
+		ufshcd_set_link_broken(hba);
+		queue_eh_work = true;
+	}
+
+	if (queue_eh_work) {
+		/*
+		 * update the transfer error masks to sticky bits, let's do this
+		 * irrespective of current ufshcd_state.
+		 */
+		hba->saved_err |= hba->errors;
+		hba->saved_uic_err |= hba->uic_error;
+
+		/* dump controller state before resetting */
+		if ((hba->saved_err &
+		     (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK)) ||
+		    (hba->saved_uic_err &&
+		     (hba->saved_uic_err != UFSHCD_UIC_PA_GENERIC_ERROR))) {
+			dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
+					__func__, hba->saved_err,
+					hba->saved_uic_err);
+			ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE,
+					 "host_regs: ");
+			ufshcd_print_pwr_info(hba);
+		}
+		ufshcd_schedule_eh_work(hba);
+		retval |= IRQ_HANDLED;
+	}
+	/*
+	 * if (!queue_eh_work) -
+	 * Other errors are either non-fatal where host recovers
+	 * itself without s/w intervention or errors that will be
+	 * handled by the SCSI core layer.
+	 */
+	hba->errors = 0;
+	hba->uic_error = 0;
+	spin_unlock(hba->host->host_lock);
+	return retval;
+}
+
+/**
+ * ufshcd_tmc_handler - handle task management function completion
+ * @hba: per adapter instance
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
+{
+	unsigned long flags, pending, issued;
+	irqreturn_t ret = IRQ_NONE;
+	int tag;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
+	issued = hba->outstanding_tasks & ~pending;
+	for_each_set_bit(tag, &issued, hba->nutmrs) {
+		struct request *req = hba->tmf_rqs[tag];
+		struct completion *c = req->end_io_data;
+
+		complete(c);
+		ret = IRQ_HANDLED;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return ret;
+}
+
+/**
+ * ufshcd_sl_intr - Interrupt service routine
+ * @hba: per adapter instance
+ * @intr_status: contains interrupts generated by the controller
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
+{
+	irqreturn_t retval = IRQ_NONE;
+
+	if (intr_status & UFSHCD_UIC_MASK)
+		retval |= ufshcd_uic_cmd_compl(hba, intr_status);
+
+	if (intr_status & UFSHCD_ERROR_MASK || hba->errors)
+		retval |= ufshcd_check_errors(hba, intr_status);
+
+	if (intr_status & UTP_TASK_REQ_COMPL)
+		retval |= ufshcd_tmc_handler(hba);
+
+	if (intr_status & UTP_TRANSFER_REQ_COMPL)
+		retval |= ufshcd_transfer_req_compl(hba);
+
+	return retval;
+}
+
+/**
+ * ufshcd_intr - Main interrupt service routine
+ * @irq: irq number
+ * @__hba: pointer to adapter instance
+ *
+ * Returns
+ *  IRQ_HANDLED - If interrupt is valid
+ *  IRQ_NONE    - If invalid interrupt
+ */
+static irqreturn_t ufshcd_intr(int irq, void *__hba)
+{
+	u32 intr_status, enabled_intr_status = 0;
+	irqreturn_t retval = IRQ_NONE;
+	struct ufs_hba *hba = __hba;
+	int retries = hba->nutrs;
+
+	intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
+	hba->ufs_stats.last_intr_status = intr_status;
+	hba->ufs_stats.last_intr_ts = ktime_get();
+
+	/*
+	 * There could be max of hba->nutrs reqs in flight and in worst case
+	 * if the reqs get finished 1 by 1 after the interrupt status is
+	 * read, make sure we handle them by checking the interrupt status
+	 * again in a loop until we process all of the reqs before returning.
+	 */
+	while (intr_status && retries--) {
+		enabled_intr_status =
+			intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
+		ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
+		if (enabled_intr_status)
+			retval |= ufshcd_sl_intr(hba, enabled_intr_status);
+
+		intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
+	}
+
+	if (enabled_intr_status && retval == IRQ_NONE &&
+	    (!(enabled_intr_status & UTP_TRANSFER_REQ_COMPL) ||
+	     hba->outstanding_reqs) && !ufshcd_eh_in_progress(hba)) {
+		dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x (0x%08x, 0x%08x)\n",
+					__func__,
+					intr_status,
+					hba->ufs_stats.last_intr_status,
+					enabled_intr_status);
+		ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
+	}
+
+	return retval;
+}
+
+static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
+{
+	int err = 0;
+	u32 mask = 1 << tag;
+	unsigned long flags;
+
+	if (!test_bit(tag, &hba->outstanding_tasks))
+		goto out;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	ufshcd_utmrl_clear(hba, tag);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	/* poll for max. 1 sec to clear door bell register by h/w */
+	err = ufshcd_wait_for_register(hba,
+			REG_UTP_TASK_REQ_DOOR_BELL,
+			mask, 0, 1000, 1000);
+
+	dev_err(hba->dev, "Clearing task management function with tag %d %s\n",
+		tag, err ? "succeeded" : "failed");
+
+out:
+	return err;
+}
+
+static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
+		struct utp_task_req_desc *treq, u8 tm_function)
+{
+	struct request_queue *q = hba->tmf_queue;
+	struct Scsi_Host *host = hba->host;
+	DECLARE_COMPLETION_ONSTACK(wait);
+	struct request *req;
+	unsigned long flags;
+	int task_tag, err;
+
+	/*
+	 * blk_mq_alloc_request() is used here only to get a free tag.
+	 */
+	req = blk_mq_alloc_request(q, REQ_OP_DRV_OUT, 0);
+	if (IS_ERR(req))
+		return PTR_ERR(req);
+
+	req->end_io_data = &wait;
+	ufshcd_hold(hba, false);
+
+	spin_lock_irqsave(host->host_lock, flags);
+
+	task_tag = req->tag;
+	WARN_ONCE(task_tag < 0 || task_tag >= hba->nutmrs, "Invalid tag %d\n",
+		  task_tag);
+	hba->tmf_rqs[req->tag] = req;
+	treq->upiu_req.req_header.dword_0 |= cpu_to_be32(task_tag);
+
+	memcpy(hba->utmrdl_base_addr + task_tag, treq, sizeof(*treq));
+	ufshcd_vops_setup_task_mgmt(hba, task_tag, tm_function);
+
+	/* send command to the controller */
+	__set_bit(task_tag, &hba->outstanding_tasks);
+
+	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL);
+	/* Make sure that doorbell is committed immediately */
+	wmb();
+
+	spin_unlock_irqrestore(host->host_lock, flags);
+
+	ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_SEND);
+
+	/* wait until the task management command is completed */
+	err = wait_for_completion_io_timeout(&wait,
+			msecs_to_jiffies(TM_CMD_TIMEOUT));
+	if (!err) {
+		ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_ERR);
+		dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
+				__func__, tm_function);
+		if (ufshcd_clear_tm_cmd(hba, task_tag))
+			dev_WARN(hba->dev, "%s: unable to clear tm cmd (slot %d) after timeout\n",
+					__func__, task_tag);
+		err = -ETIMEDOUT;
+	} else {
+		err = 0;
+		memcpy(treq, hba->utmrdl_base_addr + task_tag, sizeof(*treq));
+
+		ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_COMP);
+	}
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->tmf_rqs[req->tag] = NULL;
+	__clear_bit(task_tag, &hba->outstanding_tasks);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	ufshcd_release(hba);
+	blk_mq_free_request(req);
+
+	return err;
+}
+
+/**
+ * ufshcd_issue_tm_cmd - issues task management commands to controller
+ * @hba: per adapter instance
+ * @lun_id: LUN ID to which TM command is sent
+ * @task_id: task ID to which the TM command is applicable
+ * @tm_function: task management function opcode
+ * @tm_response: task management service response return value
+ *
+ * Returns non-zero value on error, zero on success.
+ */
+static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
+		u8 tm_function, u8 *tm_response)
+{
+	struct utp_task_req_desc treq = { { 0 }, };
+	enum utp_ocs ocs_value;
+	int err;
+
+	/* Configure task request descriptor */
+	treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
+	treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
+
+	/* Configure task request UPIU */
+	treq.upiu_req.req_header.dword_0 = cpu_to_be32(lun_id << 8) |
+				  cpu_to_be32(UPIU_TRANSACTION_TASK_REQ << 24);
+	treq.upiu_req.req_header.dword_1 = cpu_to_be32(tm_function << 16);
+
+	/*
+	 * The host shall provide the same value for LUN field in the basic
+	 * header and for Input Parameter.
+	 */
+	treq.upiu_req.input_param1 = cpu_to_be32(lun_id);
+	treq.upiu_req.input_param2 = cpu_to_be32(task_id);
+
+	err = __ufshcd_issue_tm_cmd(hba, &treq, tm_function);
+	if (err == -ETIMEDOUT)
+		return err;
+
+	ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
+	if (ocs_value != OCS_SUCCESS)
+		dev_err(hba->dev, "%s: failed, ocs = 0x%x\n",
+				__func__, ocs_value);
+	else if (tm_response)
+		*tm_response = be32_to_cpu(treq.upiu_rsp.output_param1) &
+				MASK_TM_SERVICE_RESP;
+	return err;
+}
+
+/**
+ * ufshcd_issue_devman_upiu_cmd - API for sending "utrd" type requests
+ * @hba:	per-adapter instance
+ * @req_upiu:	upiu request
+ * @rsp_upiu:	upiu reply
+ * @desc_buff:	pointer to descriptor buffer, NULL if NA
+ * @buff_len:	descriptor size, 0 if NA
+ * @cmd_type:	specifies the type (NOP, Query...)
+ * @desc_op:	descriptor operation
+ *
+ * Those type of requests uses UTP Transfer Request Descriptor - utrd.
+ * Therefore, it "rides" the device management infrastructure: uses its tag and
+ * tasks work queues.
+ *
+ * Since there is only one available tag for device management commands,
+ * the caller is expected to hold the hba->dev_cmd.lock mutex.
+ */
+static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
+					struct utp_upiu_req *req_upiu,
+					struct utp_upiu_req *rsp_upiu,
+					u8 *desc_buff, int *buff_len,
+					enum dev_cmd_type cmd_type,
+					enum query_opcode desc_op)
+{
+	DECLARE_COMPLETION_ONSTACK(wait);
+	const u32 tag = hba->reserved_slot;
+	struct ufshcd_lrb *lrbp;
+	int err = 0;
+	u8 upiu_flags;
+
+	/* Protects use of hba->reserved_slot. */
+	lockdep_assert_held(&hba->dev_cmd.lock);
+
+	down_read(&hba->clk_scaling_lock);
+
+	lrbp = &hba->lrb[tag];
+	WARN_ON(lrbp->cmd);
+	lrbp->cmd = NULL;
+	lrbp->task_tag = tag;
+	lrbp->lun = 0;
+	lrbp->intr_cmd = true;
+	ufshcd_prepare_lrbp_crypto(NULL, lrbp);
+	hba->dev_cmd.type = cmd_type;
+
+	if (hba->ufs_version <= ufshci_version(1, 1))
+		lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
+	else
+		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
+
+	/* update the task tag in the request upiu */
+	req_upiu->header.dword_0 |= cpu_to_be32(tag);
+
+	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
+
+	/* just copy the upiu request as it is */
+	memcpy(lrbp->ucd_req_ptr, req_upiu, sizeof(*lrbp->ucd_req_ptr));
+	if (desc_buff && desc_op == UPIU_QUERY_OPCODE_WRITE_DESC) {
+		/* The Data Segment Area is optional depending upon the query
+		 * function value. for WRITE DESCRIPTOR, the data segment
+		 * follows right after the tsf.
+		 */
+		memcpy(lrbp->ucd_req_ptr + 1, desc_buff, *buff_len);
+		*buff_len = 0;
+	}
+
+	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
+
+	hba->dev_cmd.complete = &wait;
+
+	ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
+
+	ufshcd_send_command(hba, tag);
+	/*
+	 * ignore the returning value here - ufshcd_check_query_response is
+	 * bound to fail since dev_cmd.query and dev_cmd.type were left empty.
+	 * read the response directly ignoring all errors.
+	 */
+	ufshcd_wait_for_dev_cmd(hba, lrbp, QUERY_REQ_TIMEOUT);
+
+	/* just copy the upiu response as it is */
+	memcpy(rsp_upiu, lrbp->ucd_rsp_ptr, sizeof(*rsp_upiu));
+	if (desc_buff && desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
+		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr + sizeof(*rsp_upiu);
+		u16 resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
+			       MASK_QUERY_DATA_SEG_LEN;
+
+		if (*buff_len >= resp_len) {
+			memcpy(desc_buff, descp, resp_len);
+			*buff_len = resp_len;
+		} else {
+			dev_warn(hba->dev,
+				 "%s: rsp size %d is bigger than buffer size %d",
+				 __func__, resp_len, *buff_len);
+			*buff_len = 0;
+			err = -EINVAL;
+		}
+	}
+	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
+				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
+
+	up_read(&hba->clk_scaling_lock);
+	return err;
+}
+
+/**
+ * ufshcd_exec_raw_upiu_cmd - API function for sending raw upiu commands
+ * @hba:	per-adapter instance
+ * @req_upiu:	upiu request
+ * @rsp_upiu:	upiu reply - only 8 DW as we do not support scsi commands
+ * @msgcode:	message code, one of UPIU Transaction Codes Initiator to Target
+ * @desc_buff:	pointer to descriptor buffer, NULL if NA
+ * @buff_len:	descriptor size, 0 if NA
+ * @desc_op:	descriptor operation
+ *
+ * Supports UTP Transfer requests (nop and query), and UTP Task
+ * Management requests.
+ * It is up to the caller to fill the upiu conent properly, as it will
+ * be copied without any further input validations.
+ */
+int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
+			     struct utp_upiu_req *req_upiu,
+			     struct utp_upiu_req *rsp_upiu,
+			     int msgcode,
+			     u8 *desc_buff, int *buff_len,
+			     enum query_opcode desc_op)
+{
+	int err;
+	enum dev_cmd_type cmd_type = DEV_CMD_TYPE_QUERY;
+	struct utp_task_req_desc treq = { { 0 }, };
+	enum utp_ocs ocs_value;
+	u8 tm_f = be32_to_cpu(req_upiu->header.dword_1) >> 16 & MASK_TM_FUNC;
+
+	switch (msgcode) {
+	case UPIU_TRANSACTION_NOP_OUT:
+		cmd_type = DEV_CMD_TYPE_NOP;
+		fallthrough;
+	case UPIU_TRANSACTION_QUERY_REQ:
+		ufshcd_hold(hba, false);
+		mutex_lock(&hba->dev_cmd.lock);
+		err = ufshcd_issue_devman_upiu_cmd(hba, req_upiu, rsp_upiu,
+						   desc_buff, buff_len,
+						   cmd_type, desc_op);
+		mutex_unlock(&hba->dev_cmd.lock);
+		ufshcd_release(hba);
+
+		break;
+	case UPIU_TRANSACTION_TASK_REQ:
+		treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
+		treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
+
+		memcpy(&treq.upiu_req, req_upiu, sizeof(*req_upiu));
+
+		err = __ufshcd_issue_tm_cmd(hba, &treq, tm_f);
+		if (err == -ETIMEDOUT)
+			break;
+
+		ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
+		if (ocs_value != OCS_SUCCESS) {
+			dev_err(hba->dev, "%s: failed, ocs = 0x%x\n", __func__,
+				ocs_value);
+			break;
+		}
+
+		memcpy(rsp_upiu, &treq.upiu_rsp, sizeof(*rsp_upiu));
+
+		break;
+	default:
+		err = -EINVAL;
+
+		break;
+	}
+
+	return err;
+}
+
+/**
+ * ufshcd_eh_device_reset_handler - device reset handler registered to
+ *                                    scsi layer.
+ * @cmd: SCSI command pointer
+ *
+ * Returns SUCCESS/FAILED
+ */
+static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+	struct Scsi_Host *host;
+	struct ufs_hba *hba;
+	u32 pos;
+	int err;
+	u8 resp = 0xF, lun;
+
+	host = cmd->device->host;
+	hba = shost_priv(host);
+
+	lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
+	err = ufshcd_issue_tm_cmd(hba, lun, 0, UFS_LOGICAL_RESET, &resp);
+	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
+		if (!err)
+			err = resp;
+		goto out;
+	}
+
+	/* clear the commands that were pending for corresponding LUN */
+	for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs) {
+		if (hba->lrb[pos].lun == lun) {
+			err = ufshcd_clear_cmd(hba, pos);
+			if (err)
+				break;
+			__ufshcd_transfer_req_compl(hba, 1U << pos);
+		}
+	}
+
+out:
+	hba->req_abort_count = 0;
+	ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, (u32)err);
+	if (!err) {
+		err = SUCCESS;
+	} else {
+		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
+		err = FAILED;
+	}
+	return err;
+}
+
+static void ufshcd_set_req_abort_skip(struct ufs_hba *hba, unsigned long bitmap)
+{
+	struct ufshcd_lrb *lrbp;
+	int tag;
+
+	for_each_set_bit(tag, &bitmap, hba->nutrs) {
+		lrbp = &hba->lrb[tag];
+		lrbp->req_abort_skip = true;
+	}
+}
+
+/**
+ * ufshcd_try_to_abort_task - abort a specific task
+ * @hba: Pointer to adapter instance
+ * @tag: Task tag/index to be aborted
+ *
+ * Abort the pending command in device by sending UFS_ABORT_TASK task management
+ * command, and in host controller by clearing the door-bell register. There can
+ * be race between controller sending the command to the device while abort is
+ * issued. To avoid that, first issue UFS_QUERY_TASK to check if the command is
+ * really issued and then try to abort it.
+ *
+ * Returns zero on success, non-zero on failure
+ */
+static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag)
+{
+	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
+	int err = 0;
+	int poll_cnt;
+	u8 resp = 0xF;
+	u32 reg;
+
+	for (poll_cnt = 100; poll_cnt; poll_cnt--) {
+		err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
+				UFS_QUERY_TASK, &resp);
+		if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) {
+			/* cmd pending in the device */
+			dev_err(hba->dev, "%s: cmd pending in the device. tag = %d\n",
+				__func__, tag);
+			break;
+		} else if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
+			/*
+			 * cmd not pending in the device, check if it is
+			 * in transition.
+			 */
+			dev_err(hba->dev, "%s: cmd at tag %d not pending in the device.\n",
+				__func__, tag);
+			reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+			if (reg & (1 << tag)) {
+				/* sleep for max. 200us to stabilize */
+				usleep_range(100, 200);
+				continue;
+			}
+			/* command completed already */
+			dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from DB.\n",
+				__func__, tag);
+			goto out;
+		} else {
+			dev_err(hba->dev,
+				"%s: no response from device. tag = %d, err %d\n",
+				__func__, tag, err);
+			if (!err)
+				err = resp; /* service response error */
+			goto out;
+		}
+	}
+
+	if (!poll_cnt) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
+			UFS_ABORT_TASK, &resp);
+	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
+		if (!err) {
+			err = resp; /* service response error */
+			dev_err(hba->dev, "%s: issued. tag = %d, err %d\n",
+				__func__, tag, err);
+		}
+		goto out;
+	}
+
+	err = ufshcd_clear_cmd(hba, tag);
+	if (err)
+		dev_err(hba->dev, "%s: Failed clearing cmd at tag %d, err %d\n",
+			__func__, tag, err);
+
+out:
+	return err;
+}
+
+/**
+ * ufshcd_abort - scsi host template eh_abort_handler callback
+ * @cmd: SCSI command pointer
+ *
+ * Returns SUCCESS/FAILED
+ */
+static int ufshcd_abort(struct scsi_cmnd *cmd)
+{
+	struct Scsi_Host *host = cmd->device->host;
+	struct ufs_hba *hba = shost_priv(host);
+	int tag = scsi_cmd_to_rq(cmd)->tag;
+	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
+	unsigned long flags;
+	int err = FAILED;
+	bool outstanding;
+	u32 reg;
+
+	WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
+
+	ufshcd_hold(hba, false);
+	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+	/* If command is already aborted/completed, return FAILED. */
+	if (!(test_bit(tag, &hba->outstanding_reqs))) {
+		dev_err(hba->dev,
+			"%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
+			__func__, tag, hba->outstanding_reqs, reg);
+		goto release;
+	}
+
+	/* Print Transfer Request of aborted task */
+	dev_info(hba->dev, "%s: Device abort task at tag %d\n", __func__, tag);
+
+	/*
+	 * Print detailed info about aborted request.
+	 * As more than one request might get aborted at the same time,
+	 * print full information only for the first aborted request in order
+	 * to reduce repeated printouts. For other aborted requests only print
+	 * basic details.
+	 */
+	scsi_print_command(cmd);
+	if (!hba->req_abort_count) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, tag);
+		ufshcd_print_evt_hist(hba);
+		ufshcd_print_host_state(hba);
+		ufshcd_print_pwr_info(hba);
+		ufshcd_print_trs(hba, 1 << tag, true);
+	} else {
+		ufshcd_print_trs(hba, 1 << tag, false);
+	}
+	hba->req_abort_count++;
+
+	if (!(reg & (1 << tag))) {
+		dev_err(hba->dev,
+		"%s: cmd was completed, but without a notifying intr, tag = %d",
+		__func__, tag);
+		__ufshcd_transfer_req_compl(hba, 1UL << tag);
+		goto release;
+	}
+
+	/*
+	 * Task abort to the device W-LUN is illegal. When this command
+	 * will fail, due to spec violation, scsi err handling next step
+	 * will be to send LU reset which, again, is a spec violation.
+	 * To avoid these unnecessary/illegal steps, first we clean up
+	 * the lrb taken by this cmd and re-set it in outstanding_reqs,
+	 * then queue the eh_work and bail.
+	 */
+	if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, lrbp->lun);
+
+		spin_lock_irqsave(host->host_lock, flags);
+		hba->force_reset = true;
+		ufshcd_schedule_eh_work(hba);
+		spin_unlock_irqrestore(host->host_lock, flags);
+		goto release;
+	}
+
+	/* Skip task abort in case previous aborts failed and report failure */
+	if (lrbp->req_abort_skip) {
+		dev_err(hba->dev, "%s: skipping abort\n", __func__);
+		ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
+		goto release;
+	}
+
+	err = ufshcd_try_to_abort_task(hba, tag);
+	if (err) {
+		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
+		ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
+		err = FAILED;
+		goto release;
+	}
+
+	/*
+	 * Clear the corresponding bit from outstanding_reqs since the command
+	 * has been aborted successfully.
+	 */
+	spin_lock_irqsave(&hba->outstanding_lock, flags);
+	outstanding = __test_and_clear_bit(tag, &hba->outstanding_reqs);
+	spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+
+	if (outstanding)
+		ufshcd_release_scsi_cmd(hba, lrbp);
+
+	err = SUCCESS;
+
+release:
+	/* Matches the ufshcd_hold() call at the start of this function. */
+	ufshcd_release(hba);
+	return err;
+}
+
+/**
+ * ufshcd_host_reset_and_restore - reset and restore host controller
+ * @hba: per-adapter instance
+ *
+ * Note that host controller reset may issue DME_RESET to
+ * local and remote (device) Uni-Pro stack and the attributes
+ * are reset to default state.
+ *
+ * Returns zero on success, non-zero on failure
+ */
+static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
+{
+	int err;
+
+	/*
+	 * Stop the host controller and complete the requests
+	 * cleared by h/w
+	 */
+	ufshpb_toggle_state(hba, HPB_PRESENT, HPB_RESET);
+	ufshcd_hba_stop(hba);
+	hba->silence_err_logs = true;
+	ufshcd_complete_requests(hba);
+	hba->silence_err_logs = false;
+
+	/* scale up clocks to max frequency before full reinitialization */
+	ufshcd_set_clk_freq(hba, true);
+
+	err = ufshcd_hba_enable(hba);
+
+	/* Establish the link again and restore the device */
+	if (!err)
+		err = ufshcd_probe_hba(hba, false);
+
+	if (err)
+		dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);
+	ufshcd_update_evt_hist(hba, UFS_EVT_HOST_RESET, (u32)err);
+	return err;
+}
+
+/**
+ * ufshcd_reset_and_restore - reset and re-initialize host/device
+ * @hba: per-adapter instance
+ *
+ * Reset and recover device, host and re-establish link. This
+ * is helpful to recover the communication in fatal error conditions.
+ *
+ * Returns zero on success, non-zero on failure
+ */
+static int ufshcd_reset_and_restore(struct ufs_hba *hba)
+{
+	u32 saved_err = 0;
+	u32 saved_uic_err = 0;
+	int err = 0;
+	unsigned long flags;
+	int retries = MAX_HOST_RESET_RETRIES;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	do {
+		/*
+		 * This is a fresh start, cache and clear saved error first,
+		 * in case new error generated during reset and restore.
+		 */
+		saved_err |= hba->saved_err;
+		saved_uic_err |= hba->saved_uic_err;
+		hba->saved_err = 0;
+		hba->saved_uic_err = 0;
+		hba->force_reset = false;
+		hba->ufshcd_state = UFSHCD_STATE_RESET;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+		/* Reset the attached device */
+		ufshcd_device_reset(hba);
+
+		err = ufshcd_host_reset_and_restore(hba);
+
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		if (err)
+			continue;
+		/* Do not exit unless operational or dead */
+		if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL &&
+		    hba->ufshcd_state != UFSHCD_STATE_ERROR &&
+		    hba->ufshcd_state != UFSHCD_STATE_EH_SCHEDULED_NON_FATAL)
+			err = -EAGAIN;
+	} while (err && --retries);
+
+	/*
+	 * Inform scsi mid-layer that we did reset and allow to handle
+	 * Unit Attention properly.
+	 */
+	scsi_report_bus_reset(hba->host, 0);
+	if (err) {
+		hba->ufshcd_state = UFSHCD_STATE_ERROR;
+		hba->saved_err |= saved_err;
+		hba->saved_uic_err |= saved_uic_err;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return err;
+}
+
+/**
+ * ufshcd_eh_host_reset_handler - host reset handler registered to scsi layer
+ * @cmd: SCSI command pointer
+ *
+ * Returns SUCCESS/FAILED
+ */
+static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
+{
+	int err = SUCCESS;
+	unsigned long flags;
+	struct ufs_hba *hba;
+
+	hba = shost_priv(cmd->device->host);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	hba->force_reset = true;
+	ufshcd_schedule_eh_work(hba);
+	dev_err(hba->dev, "%s: reset in progress - 1\n", __func__);
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	flush_work(&hba->eh_work);
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (hba->ufshcd_state == UFSHCD_STATE_ERROR)
+		err = FAILED;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	return err;
+}
+
+/**
+ * ufshcd_get_max_icc_level - calculate the ICC level
+ * @sup_curr_uA: max. current supported by the regulator
+ * @start_scan: row at the desc table to start scan from
+ * @buff: power descriptor buffer
+ *
+ * Returns calculated max ICC level for specific regulator
+ */
+static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan, char *buff)
+{
+	int i;
+	int curr_uA;
+	u16 data;
+	u16 unit;
+
+	for (i = start_scan; i >= 0; i--) {
+		data = get_unaligned_be16(&buff[2 * i]);
+		unit = (data & ATTR_ICC_LVL_UNIT_MASK) >>
+						ATTR_ICC_LVL_UNIT_OFFSET;
+		curr_uA = data & ATTR_ICC_LVL_VALUE_MASK;
+		switch (unit) {
+		case UFSHCD_NANO_AMP:
+			curr_uA = curr_uA / 1000;
+			break;
+		case UFSHCD_MILI_AMP:
+			curr_uA = curr_uA * 1000;
+			break;
+		case UFSHCD_AMP:
+			curr_uA = curr_uA * 1000 * 1000;
+			break;
+		case UFSHCD_MICRO_AMP:
+		default:
+			break;
+		}
+		if (sup_curr_uA >= curr_uA)
+			break;
+	}
+	if (i < 0) {
+		i = 0;
+		pr_err("%s: Couldn't find valid icc_level = %d", __func__, i);
+	}
+
+	return (u32)i;
+}
+
+/**
+ * ufshcd_find_max_sup_active_icc_level - calculate the max ICC level
+ * In case regulators are not initialized we'll return 0
+ * @hba: per-adapter instance
+ * @desc_buf: power descriptor buffer to extract ICC levels from.
+ * @len: length of desc_buff
+ *
+ * Returns calculated ICC level
+ */
+static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
+							u8 *desc_buf, int len)
+{
+	u32 icc_level = 0;
+
+	if (!hba->vreg_info.vcc || !hba->vreg_info.vccq ||
+						!hba->vreg_info.vccq2) {
+		/*
+		 * Using dev_dbg to avoid messages during runtime PM to avoid
+		 * never-ending cycles of messages written back to storage by
+		 * user space causing runtime resume, causing more messages and
+		 * so on.
+		 */
+		dev_dbg(hba->dev,
+			"%s: Regulator capability was not set, actvIccLevel=%d",
+							__func__, icc_level);
+		goto out;
+	}
+
+	if (hba->vreg_info.vcc->max_uA)
+		icc_level = ufshcd_get_max_icc_level(
+				hba->vreg_info.vcc->max_uA,
+				POWER_DESC_MAX_ACTV_ICC_LVLS - 1,
+				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCC_0]);
+
+	if (hba->vreg_info.vccq->max_uA)
+		icc_level = ufshcd_get_max_icc_level(
+				hba->vreg_info.vccq->max_uA,
+				icc_level,
+				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ_0]);
+
+	if (hba->vreg_info.vccq2->max_uA)
+		icc_level = ufshcd_get_max_icc_level(
+				hba->vreg_info.vccq2->max_uA,
+				icc_level,
+				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ2_0]);
+out:
+	return icc_level;
+}
+
+static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba)
+{
+	int ret;
+	int buff_len = hba->desc_size[QUERY_DESC_IDN_POWER];
+	u8 *desc_buf;
+	u32 icc_level;
+
+	desc_buf = kmalloc(buff_len, GFP_KERNEL);
+	if (!desc_buf)
+		return;
+
+	ret = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_POWER, 0, 0,
+				     desc_buf, buff_len);
+	if (ret) {
+		dev_err(hba->dev,
+			"%s: Failed reading power descriptor.len = %d ret = %d",
+			__func__, buff_len, ret);
+		goto out;
+	}
+
+	icc_level = ufshcd_find_max_sup_active_icc_level(hba, desc_buf,
+							 buff_len);
+	dev_dbg(hba->dev, "%s: setting icc_level 0x%x", __func__, icc_level);
+
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+		QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0, &icc_level);
+
+	if (ret)
+		dev_err(hba->dev,
+			"%s: Failed configuring bActiveICCLevel = %d ret = %d",
+			__func__, icc_level, ret);
+
+out:
+	kfree(desc_buf);
+}
+
+static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
+{
+	scsi_autopm_get_device(sdev);
+	blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev);
+	if (sdev->rpm_autosuspend)
+		pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev,
+						 RPM_AUTOSUSPEND_DELAY_MS);
+	scsi_autopm_put_device(sdev);
+}
+
+/**
+ * ufshcd_scsi_add_wlus - Adds required W-LUs
+ * @hba: per-adapter instance
+ *
+ * UFS device specification requires the UFS devices to support 4 well known
+ * logical units:
+ *	"REPORT_LUNS" (address: 01h)
+ *	"UFS Device" (address: 50h)
+ *	"RPMB" (address: 44h)
+ *	"BOOT" (address: 30h)
+ * UFS device's power management needs to be controlled by "POWER CONDITION"
+ * field of SSU (START STOP UNIT) command. But this "power condition" field
+ * will take effect only when its sent to "UFS device" well known logical unit
+ * hence we require the scsi_device instance to represent this logical unit in
+ * order for the UFS host driver to send the SSU command for power management.
+ *
+ * We also require the scsi_device instance for "RPMB" (Replay Protected Memory
+ * Block) LU so user space process can control this LU. User space may also
+ * want to have access to BOOT LU.
+ *
+ * This function adds scsi device instances for each of all well known LUs
+ * (except "REPORT LUNS" LU).
+ *
+ * Returns zero on success (all required W-LUs are added successfully),
+ * non-zero error value on failure (if failed to add any of the required W-LU).
+ */
+static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
+{
+	int ret = 0;
+	struct scsi_device *sdev_boot, *sdev_rpmb;
+
+	hba->ufs_device_wlun = __scsi_add_device(hba->host, 0, 0,
+		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN), NULL);
+	if (IS_ERR(hba->ufs_device_wlun)) {
+		ret = PTR_ERR(hba->ufs_device_wlun);
+		hba->ufs_device_wlun = NULL;
+		goto out;
+	}
+	scsi_device_put(hba->ufs_device_wlun);
+
+	sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
+		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN), NULL);
+	if (IS_ERR(sdev_rpmb)) {
+		ret = PTR_ERR(sdev_rpmb);
+		goto remove_ufs_device_wlun;
+	}
+	ufshcd_blk_pm_runtime_init(sdev_rpmb);
+	scsi_device_put(sdev_rpmb);
+
+	sdev_boot = __scsi_add_device(hba->host, 0, 0,
+		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
+	if (IS_ERR(sdev_boot)) {
+		dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__);
+	} else {
+		ufshcd_blk_pm_runtime_init(sdev_boot);
+		scsi_device_put(sdev_boot);
+	}
+	goto out;
+
+remove_ufs_device_wlun:
+	scsi_remove_device(hba->ufs_device_wlun);
+out:
+	return ret;
+}
+
+static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	u8 lun;
+	u32 d_lu_wb_buf_alloc;
+	u32 ext_ufs_feature;
+
+	if (!ufshcd_is_wb_allowed(hba))
+		return;
+
+	/*
+	 * Probe WB only for UFS-2.2 and UFS-3.1 (and later) devices or
+	 * UFS devices with quirk UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES
+	 * enabled
+	 */
+	if (!(dev_info->wspecversion >= 0x310 ||
+	      dev_info->wspecversion == 0x220 ||
+	     (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES)))
+		goto wb_disabled;
+
+	if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
+	    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
+		goto wb_disabled;
+
+	ext_ufs_feature = get_unaligned_be32(desc_buf +
+					DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+
+	if (!(ext_ufs_feature & UFS_DEV_WRITE_BOOSTER_SUP))
+		goto wb_disabled;
+
+	/*
+	 * WB may be supported but not configured while provisioning. The spec
+	 * says, in dedicated wb buffer mode, a max of 1 lun would have wb
+	 * buffer configured.
+	 */
+	dev_info->wb_buffer_type = desc_buf[DEVICE_DESC_PARAM_WB_TYPE];
+
+	dev_info->b_presrv_uspc_en =
+		desc_buf[DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN];
+
+	if (dev_info->wb_buffer_type == WB_BUF_MODE_SHARED) {
+		if (!get_unaligned_be32(desc_buf +
+				   DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS))
+			goto wb_disabled;
+	} else {
+		for (lun = 0; lun < UFS_UPIU_MAX_WB_LUN_ID; lun++) {
+			d_lu_wb_buf_alloc = 0;
+			ufshcd_read_unit_desc_param(hba,
+					lun,
+					UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS,
+					(u8 *)&d_lu_wb_buf_alloc,
+					sizeof(d_lu_wb_buf_alloc));
+			if (d_lu_wb_buf_alloc) {
+				dev_info->wb_dedicated_lu = lun;
+				break;
+			}
+		}
+
+		if (!d_lu_wb_buf_alloc)
+			goto wb_disabled;
+	}
+
+	if (!ufshcd_is_wb_buf_lifetime_available(hba))
+		goto wb_disabled;
+
+	return;
+
+wb_disabled:
+	hba->caps &= ~UFSHCD_CAP_WB_EN;
+}
+
+static void ufshcd_temp_notif_probe(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	u32 ext_ufs_feature;
+	u8 mask = 0;
+
+	if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
+		return;
+
+	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+
+	if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
+		mask |= MASK_EE_TOO_LOW_TEMP;
+
+	if (ext_ufs_feature & UFS_DEV_HIGH_TEMP_NOTIF)
+		mask |= MASK_EE_TOO_HIGH_TEMP;
+
+	if (mask) {
+		ufshcd_enable_ee(hba, mask);
+		ufs_hwmon_probe(hba, mask);
+	}
+}
+
+void ufshcd_fixup_dev_quirks(struct ufs_hba *hba,
+			     const struct ufs_dev_quirk *fixups)
+{
+	const struct ufs_dev_quirk *f;
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+
+	if (!fixups)
+		return;
+
+	for (f = fixups; f->quirk; f++) {
+		if ((f->wmanufacturerid == dev_info->wmanufacturerid ||
+		     f->wmanufacturerid == UFS_ANY_VENDOR) &&
+		     ((dev_info->model &&
+		       STR_PRFX_EQUAL(f->model, dev_info->model)) ||
+		      !strcmp(f->model, UFS_ANY_MODEL)))
+			hba->dev_quirks |= f->quirk;
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_fixup_dev_quirks);
+
+static void ufs_fixup_device_setup(struct ufs_hba *hba)
+{
+	/* fix by general quirk table */
+	ufshcd_fixup_dev_quirks(hba, ufs_fixups);
+
+	/* allow vendors to fix quirks */
+	ufshcd_vops_fixup_dev_quirks(hba);
+}
+
+static int ufs_get_device_desc(struct ufs_hba *hba)
+{
+	int err;
+	u8 model_index;
+	u8 b_ufs_feature_sup;
+	u8 *desc_buf;
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+
+	desc_buf = kmalloc(QUERY_DESC_MAX_SIZE, GFP_KERNEL);
+	if (!desc_buf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_DEVICE, 0, 0, desc_buf,
+				     hba->desc_size[QUERY_DESC_IDN_DEVICE]);
+	if (err) {
+		dev_err(hba->dev, "%s: Failed reading Device Desc. err = %d\n",
+			__func__, err);
+		goto out;
+	}
+
+	/*
+	 * getting vendor (manufacturerID) and Bank Index in big endian
+	 * format
+	 */
+	dev_info->wmanufacturerid = desc_buf[DEVICE_DESC_PARAM_MANF_ID] << 8 |
+				     desc_buf[DEVICE_DESC_PARAM_MANF_ID + 1];
+
+	/* getting Specification Version in big endian format */
+	dev_info->wspecversion = desc_buf[DEVICE_DESC_PARAM_SPEC_VER] << 8 |
+				      desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
+	b_ufs_feature_sup = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT];
+
+	model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
+
+	if (dev_info->wspecversion >= UFS_DEV_HPB_SUPPORT_VERSION &&
+	    (b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT)) {
+		bool hpb_en = false;
+
+		ufshpb_get_dev_info(hba, desc_buf);
+
+		if (!ufshpb_is_legacy(hba))
+			err = ufshcd_query_flag_retry(hba,
+						      UPIU_QUERY_OPCODE_READ_FLAG,
+						      QUERY_FLAG_IDN_HPB_EN, 0,
+						      &hpb_en);
+
+		if (ufshpb_is_legacy(hba) || (!err && hpb_en))
+			dev_info->hpb_enabled = true;
+	}
+
+	err = ufshcd_read_string_desc(hba, model_index,
+				      &dev_info->model, SD_ASCII_STD);
+	if (err < 0) {
+		dev_err(hba->dev, "%s: Failed reading Product Name. err = %d\n",
+			__func__, err);
+		goto out;
+	}
+
+	hba->luns_avail = desc_buf[DEVICE_DESC_PARAM_NUM_LU] +
+		desc_buf[DEVICE_DESC_PARAM_NUM_WLU];
+
+	ufs_fixup_device_setup(hba);
+
+	ufshcd_wb_probe(hba, desc_buf);
+
+	ufshcd_temp_notif_probe(hba, desc_buf);
+
+	/*
+	 * ufshcd_read_string_desc returns size of the string
+	 * reset the error value
+	 */
+	err = 0;
+
+out:
+	kfree(desc_buf);
+	return err;
+}
+
+static void ufs_put_device_desc(struct ufs_hba *hba)
+{
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+
+	kfree(dev_info->model);
+	dev_info->model = NULL;
+}
+
+/**
+ * ufshcd_tune_pa_tactivate - Tunes PA_TActivate of local UniPro
+ * @hba: per-adapter instance
+ *
+ * PA_TActivate parameter can be tuned manually if UniPro version is less than
+ * 1.61. PA_TActivate needs to be greater than or equal to peerM-PHY's
+ * RX_MIN_ACTIVATETIME_CAPABILITY attribute. This optimal value can help reduce
+ * the hibern8 exit latency.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_tune_pa_tactivate(struct ufs_hba *hba)
+{
+	int ret = 0;
+	u32 peer_rx_min_activatetime = 0, tuned_pa_tactivate;
+
+	ret = ufshcd_dme_peer_get(hba,
+				  UIC_ARG_MIB_SEL(
+					RX_MIN_ACTIVATETIME_CAPABILITY,
+					UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
+				  &peer_rx_min_activatetime);
+	if (ret)
+		goto out;
+
+	/* make sure proper unit conversion is applied */
+	tuned_pa_tactivate =
+		((peer_rx_min_activatetime * RX_MIN_ACTIVATETIME_UNIT_US)
+		 / PA_TACTIVATE_TIME_UNIT_US);
+	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
+			     tuned_pa_tactivate);
+
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_tune_pa_hibern8time - Tunes PA_Hibern8Time of local UniPro
+ * @hba: per-adapter instance
+ *
+ * PA_Hibern8Time parameter can be tuned manually if UniPro version is less than
+ * 1.61. PA_Hibern8Time needs to be maximum of local M-PHY's
+ * TX_HIBERN8TIME_CAPABILITY & peer M-PHY's RX_HIBERN8TIME_CAPABILITY.
+ * This optimal value can help reduce the hibern8 exit latency.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_tune_pa_hibern8time(struct ufs_hba *hba)
+{
+	int ret = 0;
+	u32 local_tx_hibern8_time_cap = 0, peer_rx_hibern8_time_cap = 0;
+	u32 max_hibern8_time, tuned_pa_hibern8time;
+
+	ret = ufshcd_dme_get(hba,
+			     UIC_ARG_MIB_SEL(TX_HIBERN8TIME_CAPABILITY,
+					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(0)),
+				  &local_tx_hibern8_time_cap);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_dme_peer_get(hba,
+				  UIC_ARG_MIB_SEL(RX_HIBERN8TIME_CAPABILITY,
+					UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
+				  &peer_rx_hibern8_time_cap);
+	if (ret)
+		goto out;
+
+	max_hibern8_time = max(local_tx_hibern8_time_cap,
+			       peer_rx_hibern8_time_cap);
+	/* make sure proper unit conversion is applied */
+	tuned_pa_hibern8time = ((max_hibern8_time * HIBERN8TIME_UNIT_US)
+				/ PA_HIBERN8_TIME_UNIT_US);
+	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HIBERN8TIME),
+			     tuned_pa_hibern8time);
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_quirk_tune_host_pa_tactivate - Ensures that host PA_TACTIVATE is
+ * less than device PA_TACTIVATE time.
+ * @hba: per-adapter instance
+ *
+ * Some UFS devices require host PA_TACTIVATE to be lower than device
+ * PA_TACTIVATE, we need to enable UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE quirk
+ * for such devices.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_quirk_tune_host_pa_tactivate(struct ufs_hba *hba)
+{
+	int ret = 0;
+	u32 granularity, peer_granularity;
+	u32 pa_tactivate, peer_pa_tactivate;
+	u32 pa_tactivate_us, peer_pa_tactivate_us;
+	u8 gran_to_us_table[] = {1, 4, 8, 16, 32, 100};
+
+	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
+				  &granularity);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
+				  &peer_granularity);
+	if (ret)
+		goto out;
+
+	if ((granularity < PA_GRANULARITY_MIN_VAL) ||
+	    (granularity > PA_GRANULARITY_MAX_VAL)) {
+		dev_err(hba->dev, "%s: invalid host PA_GRANULARITY %d",
+			__func__, granularity);
+		return -EINVAL;
+	}
+
+	if ((peer_granularity < PA_GRANULARITY_MIN_VAL) ||
+	    (peer_granularity > PA_GRANULARITY_MAX_VAL)) {
+		dev_err(hba->dev, "%s: invalid device PA_GRANULARITY %d",
+			__func__, peer_granularity);
+		return -EINVAL;
+	}
+
+	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE),
+				  &peer_pa_tactivate);
+	if (ret)
+		goto out;
+
+	pa_tactivate_us = pa_tactivate * gran_to_us_table[granularity - 1];
+	peer_pa_tactivate_us = peer_pa_tactivate *
+			     gran_to_us_table[peer_granularity - 1];
+
+	if (pa_tactivate_us >= peer_pa_tactivate_us) {
+		u32 new_peer_pa_tactivate;
+
+		new_peer_pa_tactivate = pa_tactivate_us /
+				      gran_to_us_table[peer_granularity - 1];
+		new_peer_pa_tactivate++;
+		ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
+					  new_peer_pa_tactivate);
+	}
+
+out:
+	return ret;
+}
+
+static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
+{
+	if (ufshcd_is_unipro_pa_params_tuning_req(hba)) {
+		ufshcd_tune_pa_tactivate(hba);
+		ufshcd_tune_pa_hibern8time(hba);
+	}
+
+	ufshcd_vops_apply_dev_quirks(hba);
+
+	if (hba->dev_quirks & UFS_DEVICE_QUIRK_PA_TACTIVATE)
+		/* set 1ms timeout for PA_TACTIVATE */
+		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 10);
+
+	if (hba->dev_quirks & UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE)
+		ufshcd_quirk_tune_host_pa_tactivate(hba);
+}
+
+static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)
+{
+	hba->ufs_stats.hibern8_exit_cnt = 0;
+	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
+	hba->req_abort_count = 0;
+}
+
+static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
+{
+	int err;
+	size_t buff_len;
+	u8 *desc_buf;
+
+	buff_len = hba->desc_size[QUERY_DESC_IDN_GEOMETRY];
+	desc_buf = kmalloc(buff_len, GFP_KERNEL);
+	if (!desc_buf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_GEOMETRY, 0, 0,
+				     desc_buf, buff_len);
+	if (err) {
+		dev_err(hba->dev, "%s: Failed reading Geometry Desc. err = %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 1)
+		hba->dev_info.max_lu_supported = 32;
+	else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
+		hba->dev_info.max_lu_supported = 8;
+
+	if (hba->desc_size[QUERY_DESC_IDN_GEOMETRY] >=
+		GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS)
+		ufshpb_get_geo_info(hba, desc_buf);
+
+out:
+	kfree(desc_buf);
+	return err;
+}
+
+struct ufs_ref_clk {
+	unsigned long freq_hz;
+	enum ufs_ref_clk_freq val;
+};
+
+static struct ufs_ref_clk ufs_ref_clk_freqs[] = {
+	{19200000, REF_CLK_FREQ_19_2_MHZ},
+	{26000000, REF_CLK_FREQ_26_MHZ},
+	{38400000, REF_CLK_FREQ_38_4_MHZ},
+	{52000000, REF_CLK_FREQ_52_MHZ},
+	{0, REF_CLK_FREQ_INVAL},
+};
+
+static enum ufs_ref_clk_freq
+ufs_get_bref_clk_from_hz(unsigned long freq)
+{
+	int i;
+
+	for (i = 0; ufs_ref_clk_freqs[i].freq_hz; i++)
+		if (ufs_ref_clk_freqs[i].freq_hz == freq)
+			return ufs_ref_clk_freqs[i].val;
+
+	return REF_CLK_FREQ_INVAL;
+}
+
+void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba, struct clk *refclk)
+{
+	unsigned long freq;
+
+	freq = clk_get_rate(refclk);
+
+	hba->dev_ref_clk_freq =
+		ufs_get_bref_clk_from_hz(freq);
+
+	if (hba->dev_ref_clk_freq == REF_CLK_FREQ_INVAL)
+		dev_err(hba->dev,
+		"invalid ref_clk setting = %ld\n", freq);
+}
+
+static int ufshcd_set_dev_ref_clk(struct ufs_hba *hba)
+{
+	int err;
+	u32 ref_clk;
+	u32 freq = hba->dev_ref_clk_freq;
+
+	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+			QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &ref_clk);
+
+	if (err) {
+		dev_err(hba->dev, "failed reading bRefClkFreq. err = %d\n",
+			err);
+		goto out;
+	}
+
+	if (ref_clk == freq)
+		goto out; /* nothing to update */
+
+	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+			QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &freq);
+
+	if (err) {
+		dev_err(hba->dev, "bRefClkFreq setting to %lu Hz failed\n",
+			ufs_ref_clk_freqs[freq].freq_hz);
+		goto out;
+	}
+
+	dev_dbg(hba->dev, "bRefClkFreq setting to %lu Hz succeeded\n",
+			ufs_ref_clk_freqs[freq].freq_hz);
+
+out:
+	return err;
+}
+
+static int ufshcd_device_params_init(struct ufs_hba *hba)
+{
+	bool flag;
+	int ret, i;
+
+	 /* Init device descriptor sizes */
+	for (i = 0; i < QUERY_DESC_IDN_MAX; i++)
+		hba->desc_size[i] = QUERY_DESC_MAX_SIZE;
+
+	/* Init UFS geometry descriptor related parameters */
+	ret = ufshcd_device_geo_params_init(hba);
+	if (ret)
+		goto out;
+
+	/* Check and apply UFS device quirks */
+	ret = ufs_get_device_desc(hba);
+	if (ret) {
+		dev_err(hba->dev, "%s: Failed getting device info. err = %d\n",
+			__func__, ret);
+		goto out;
+	}
+
+	ufshcd_get_ref_clk_gating_wait(hba);
+
+	if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+			QUERY_FLAG_IDN_PWR_ON_WPE, 0, &flag))
+		hba->dev_info.f_power_on_wp_en = flag;
+
+	/* Probe maximum power mode co-supported by both UFS host and device */
+	if (ufshcd_get_max_pwr_mode(hba))
+		dev_err(hba->dev,
+			"%s: Failed getting max supported power mode\n",
+			__func__);
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_add_lus - probe and add UFS logical units
+ * @hba: per-adapter instance
+ */
+static int ufshcd_add_lus(struct ufs_hba *hba)
+{
+	int ret;
+
+	/* Add required well known logical units to scsi mid layer */
+	ret = ufshcd_scsi_add_wlus(hba);
+	if (ret)
+		goto out;
+
+	/* Initialize devfreq after UFS device is detected */
+	if (ufshcd_is_clkscaling_supported(hba)) {
+		memcpy(&hba->clk_scaling.saved_pwr_info.info,
+			&hba->pwr_info,
+			sizeof(struct ufs_pa_layer_attr));
+		hba->clk_scaling.saved_pwr_info.is_valid = true;
+		hba->clk_scaling.is_allowed = true;
+
+		ret = ufshcd_devfreq_init(hba);
+		if (ret)
+			goto out;
+
+		hba->clk_scaling.is_enabled = true;
+		ufshcd_init_clk_scaling_sysfs(hba);
+	}
+
+	ufs_bsg_probe(hba);
+	ufshpb_init(hba);
+	scsi_scan_host(hba->host);
+	pm_runtime_put_sync(hba->dev);
+
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_probe_hba - probe hba to detect device and initialize it
+ * @hba: per-adapter instance
+ * @init_dev_params: whether or not to call ufshcd_device_params_init().
+ *
+ * Execute link-startup and verify device initialization
+ */
+static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
+{
+	int ret;
+	unsigned long flags;
+	ktime_t start = ktime_get();
+
+	hba->ufshcd_state = UFSHCD_STATE_RESET;
+
+	ret = ufshcd_link_startup(hba);
+	if (ret)
+		goto out;
+
+	if (hba->quirks & UFSHCD_QUIRK_SKIP_PH_CONFIGURATION)
+		goto out;
+
+	/* Debug counters initialization */
+	ufshcd_clear_dbg_ufs_stats(hba);
+
+	/* UniPro link is active now */
+	ufshcd_set_link_active(hba);
+
+	/* Verify device initialization by sending NOP OUT UPIU */
+	ret = ufshcd_verify_dev_init(hba);
+	if (ret)
+		goto out;
+
+	/* Initiate UFS initialization, and waiting until completion */
+	ret = ufshcd_complete_dev_init(hba);
+	if (ret)
+		goto out;
+
+	/*
+	 * Initialize UFS device parameters used by driver, these
+	 * parameters are associated with UFS descriptors.
+	 */
+	if (init_dev_params) {
+		ret = ufshcd_device_params_init(hba);
+		if (ret)
+			goto out;
+	}
+
+	ufshcd_tune_unipro_params(hba);
+
+	/* UFS device is also active now */
+	ufshcd_set_ufs_dev_active(hba);
+	ufshcd_force_reset_auto_bkops(hba);
+
+	/* Gear up to HS gear if supported */
+	if (hba->max_pwr_info.is_valid) {
+		/*
+		 * Set the right value to bRefClkFreq before attempting to
+		 * switch to HS gears.
+		 */
+		if (hba->dev_ref_clk_freq != REF_CLK_FREQ_INVAL)
+			ufshcd_set_dev_ref_clk(hba);
+		ret = ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
+		if (ret) {
+			dev_err(hba->dev, "%s: Failed setting power mode, err = %d\n",
+					__func__, ret);
+			goto out;
+		}
+		ufshcd_print_pwr_info(hba);
+	}
+
+	/*
+	 * bActiveICCLevel is volatile for UFS device (as per latest v2.1 spec)
+	 * and for removable UFS card as well, hence always set the parameter.
+	 * Note: Error handler may issue the device reset hence resetting
+	 * bActiveICCLevel as well so it is always safe to set this here.
+	 */
+	ufshcd_set_active_icc_lvl(hba);
+
+	ufshcd_wb_config(hba);
+	if (hba->ee_usr_mask)
+		ufshcd_write_ee_control(hba);
+	/* Enable Auto-Hibernate if configured */
+	ufshcd_auto_hibern8_enable(hba);
+
+	ufshpb_toggle_state(hba, HPB_RESET, HPB_PRESENT);
+out:
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	if (ret)
+		hba->ufshcd_state = UFSHCD_STATE_ERROR;
+	else if (hba->ufshcd_state == UFSHCD_STATE_RESET)
+		hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	trace_ufshcd_init(dev_name(hba->dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	return ret;
+}
+
+/**
+ * ufshcd_async_scan - asynchronous execution for probing hba
+ * @data: data pointer to pass to this function
+ * @cookie: cookie data
+ */
+static void ufshcd_async_scan(void *data, async_cookie_t cookie)
+{
+	struct ufs_hba *hba = (struct ufs_hba *)data;
+	int ret;
+
+	down(&hba->host_sem);
+	/* Initialize hba, detect and initialize UFS device */
+	ret = ufshcd_probe_hba(hba, true);
+	up(&hba->host_sem);
+	if (ret)
+		goto out;
+
+	/* Probe and add UFS logical units  */
+	ret = ufshcd_add_lus(hba);
+out:
+	/*
+	 * If we failed to initialize the device or the device is not
+	 * present, turn off the power/clocks etc.
+	 */
+	if (ret) {
+		pm_runtime_put_sync(hba->dev);
+		ufshcd_hba_exit(hba);
+	}
+}
+
+static const struct attribute_group *ufshcd_driver_groups[] = {
+	&ufs_sysfs_unit_descriptor_group,
+	&ufs_sysfs_lun_attributes_group,
+#ifdef CONFIG_SCSI_UFS_HPB
+	&ufs_sysfs_hpb_stat_group,
+	&ufs_sysfs_hpb_param_group,
+#endif
+	NULL,
+};
+
+static struct ufs_hba_variant_params ufs_hba_vps = {
+	.hba_enable_delay_us		= 1000,
+	.wb_flush_threshold		= UFS_WB_BUF_REMAIN_PERCENT(40),
+	.devfreq_profile.polling_ms	= 100,
+	.devfreq_profile.target		= ufshcd_devfreq_target,
+	.devfreq_profile.get_dev_status	= ufshcd_devfreq_get_dev_status,
+	.ondemand_data.upthreshold	= 70,
+	.ondemand_data.downdifferential	= 5,
+};
+
+static struct scsi_host_template ufshcd_driver_template = {
+	.module			= THIS_MODULE,
+	.name			= UFSHCD,
+	.proc_name		= UFSHCD,
+	.map_queues		= ufshcd_map_queues,
+	.queuecommand		= ufshcd_queuecommand,
+	.mq_poll		= ufshcd_poll,
+	.slave_alloc		= ufshcd_slave_alloc,
+	.slave_configure	= ufshcd_slave_configure,
+	.slave_destroy		= ufshcd_slave_destroy,
+	.change_queue_depth	= ufshcd_change_queue_depth,
+	.eh_abort_handler	= ufshcd_abort,
+	.eh_device_reset_handler = ufshcd_eh_device_reset_handler,
+	.eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
+	.this_id		= -1,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= UFSHCD_CMD_PER_LUN,
+	.can_queue		= UFSHCD_CAN_QUEUE,
+	.max_segment_size	= PRDT_DATA_BYTE_COUNT_MAX,
+	.max_host_blocked	= 1,
+	.track_queue_depth	= 1,
+	.sdev_groups		= ufshcd_driver_groups,
+	.dma_boundary		= PAGE_SIZE - 1,
+	.rpm_autosuspend_delay	= RPM_AUTOSUSPEND_DELAY_MS,
+};
+
+static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
+				   int ua)
+{
+	int ret;
+
+	if (!vreg)
+		return 0;
+
+	/*
+	 * "set_load" operation shall be required on those regulators
+	 * which specifically configured current limitation. Otherwise
+	 * zero max_uA may cause unexpected behavior when regulator is
+	 * enabled or set as high power mode.
+	 */
+	if (!vreg->max_uA)
+		return 0;
+
+	ret = regulator_set_load(vreg->reg, ua);
+	if (ret < 0) {
+		dev_err(dev, "%s: %s set load (ua=%d) failed, err=%d\n",
+				__func__, vreg->name, ua, ret);
+	}
+
+	return ret;
+}
+
+static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
+					 struct ufs_vreg *vreg)
+{
+	return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
+}
+
+static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
+					 struct ufs_vreg *vreg)
+{
+	if (!vreg)
+		return 0;
+
+	return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
+}
+
+static int ufshcd_config_vreg(struct device *dev,
+		struct ufs_vreg *vreg, bool on)
+{
+	if (regulator_count_voltages(vreg->reg) <= 0)
+		return 0;
+
+	return ufshcd_config_vreg_load(dev, vreg, on ? vreg->max_uA : 0);
+}
+
+static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
+{
+	int ret = 0;
+
+	if (!vreg || vreg->enabled)
+		goto out;
+
+	ret = ufshcd_config_vreg(dev, vreg, true);
+	if (!ret)
+		ret = regulator_enable(vreg->reg);
+
+	if (!ret)
+		vreg->enabled = true;
+	else
+		dev_err(dev, "%s: %s enable failed, err=%d\n",
+				__func__, vreg->name, ret);
+out:
+	return ret;
+}
+
+static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
+{
+	int ret = 0;
+
+	if (!vreg || !vreg->enabled || vreg->always_on)
+		goto out;
+
+	ret = regulator_disable(vreg->reg);
+
+	if (!ret) {
+		/* ignore errors on applying disable config */
+		ufshcd_config_vreg(dev, vreg, false);
+		vreg->enabled = false;
+	} else {
+		dev_err(dev, "%s: %s disable failed, err=%d\n",
+				__func__, vreg->name, ret);
+	}
+out:
+	return ret;
+}
+
+static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
+{
+	int ret = 0;
+	struct device *dev = hba->dev;
+	struct ufs_vreg_info *info = &hba->vreg_info;
+
+	ret = ufshcd_toggle_vreg(dev, info->vcc, on);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_toggle_vreg(dev, info->vccq, on);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_toggle_vreg(dev, info->vccq2, on);
+
+out:
+	if (ret) {
+		ufshcd_toggle_vreg(dev, info->vccq2, false);
+		ufshcd_toggle_vreg(dev, info->vccq, false);
+		ufshcd_toggle_vreg(dev, info->vcc, false);
+	}
+	return ret;
+}
+
+static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
+{
+	struct ufs_vreg_info *info = &hba->vreg_info;
+
+	return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);
+}
+
+static int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
+{
+	int ret = 0;
+
+	if (!vreg)
+		goto out;
+
+	vreg->reg = devm_regulator_get(dev, vreg->name);
+	if (IS_ERR(vreg->reg)) {
+		ret = PTR_ERR(vreg->reg);
+		dev_err(dev, "%s: %s get failed, err=%d\n",
+				__func__, vreg->name, ret);
+	}
+out:
+	return ret;
+}
+
+static int ufshcd_init_vreg(struct ufs_hba *hba)
+{
+	int ret = 0;
+	struct device *dev = hba->dev;
+	struct ufs_vreg_info *info = &hba->vreg_info;
+
+	ret = ufshcd_get_vreg(dev, info->vcc);
+	if (ret)
+		goto out;
+
+	ret = ufshcd_get_vreg(dev, info->vccq);
+	if (!ret)
+		ret = ufshcd_get_vreg(dev, info->vccq2);
+out:
+	return ret;
+}
+
+static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
+{
+	struct ufs_vreg_info *info = &hba->vreg_info;
+
+	if (info)
+		return ufshcd_get_vreg(hba->dev, info->vdd_hba);
+
+	return 0;
+}
+
+static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
+{
+	int ret = 0;
+	struct ufs_clk_info *clki;
+	struct list_head *head = &hba->clk_list_head;
+	unsigned long flags;
+	ktime_t start = ktime_get();
+	bool clk_state_changed = false;
+
+	if (list_empty(head))
+		goto out;
+
+	ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(clki, head, list) {
+		if (!IS_ERR_OR_NULL(clki->clk)) {
+			/*
+			 * Don't disable clocks which are needed
+			 * to keep the link active.
+			 */
+			if (ufshcd_is_link_active(hba) &&
+			    clki->keep_link_active)
+				continue;
+
+			clk_state_changed = on ^ clki->enabled;
+			if (on && !clki->enabled) {
+				ret = clk_prepare_enable(clki->clk);
+				if (ret) {
+					dev_err(hba->dev, "%s: %s prepare enable failed, %d\n",
+						__func__, clki->name, ret);
+					goto out;
+				}
+			} else if (!on && clki->enabled) {
+				clk_disable_unprepare(clki->clk);
+			}
+			clki->enabled = on;
+			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
+					clki->name, on ? "en" : "dis");
+		}
+	}
+
+	ret = ufshcd_vops_setup_clocks(hba, on, POST_CHANGE);
+	if (ret)
+		return ret;
+
+out:
+	if (ret) {
+		list_for_each_entry(clki, head, list) {
+			if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
+				clk_disable_unprepare(clki->clk);
+		}
+	} else if (!ret && on) {
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		hba->clk_gating.state = CLKS_ON;
+		trace_ufshcd_clk_gating(dev_name(hba->dev),
+					hba->clk_gating.state);
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+	}
+
+	if (clk_state_changed)
+		trace_ufshcd_profile_clk_gating(dev_name(hba->dev),
+			(on ? "on" : "off"),
+			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+	return ret;
+}
+
+static int ufshcd_init_clocks(struct ufs_hba *hba)
+{
+	int ret = 0;
+	struct ufs_clk_info *clki;
+	struct device *dev = hba->dev;
+	struct list_head *head = &hba->clk_list_head;
+
+	if (list_empty(head))
+		goto out;
+
+	list_for_each_entry(clki, head, list) {
+		if (!clki->name)
+			continue;
+
+		clki->clk = devm_clk_get(dev, clki->name);
+		if (IS_ERR(clki->clk)) {
+			ret = PTR_ERR(clki->clk);
+			dev_err(dev, "%s: %s clk get failed, %d\n",
+					__func__, clki->name, ret);
+			goto out;
+		}
+
+		/*
+		 * Parse device ref clk freq as per device tree "ref_clk".
+		 * Default dev_ref_clk_freq is set to REF_CLK_FREQ_INVAL
+		 * in ufshcd_alloc_host().
+		 */
+		if (!strcmp(clki->name, "ref_clk"))
+			ufshcd_parse_dev_ref_clk_freq(hba, clki->clk);
+
+		if (clki->max_freq) {
+			ret = clk_set_rate(clki->clk, clki->max_freq);
+			if (ret) {
+				dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
+					__func__, clki->name,
+					clki->max_freq, ret);
+				goto out;
+			}
+			clki->curr_freq = clki->max_freq;
+		}
+		dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
+				clki->name, clk_get_rate(clki->clk));
+	}
+out:
+	return ret;
+}
+
+static int ufshcd_variant_hba_init(struct ufs_hba *hba)
+{
+	int err = 0;
+
+	if (!hba->vops)
+		goto out;
+
+	err = ufshcd_vops_init(hba);
+	if (err)
+		dev_err(hba->dev, "%s: variant %s init failed err %d\n",
+			__func__, ufshcd_get_var_name(hba), err);
+out:
+	return err;
+}
+
+static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
+{
+	if (!hba->vops)
+		return;
+
+	ufshcd_vops_exit(hba);
+}
+
+static int ufshcd_hba_init(struct ufs_hba *hba)
+{
+	int err;
+
+	/*
+	 * Handle host controller power separately from the UFS device power
+	 * rails as it will help controlling the UFS host controller power
+	 * collapse easily which is different than UFS device power collapse.
+	 * Also, enable the host controller power before we go ahead with rest
+	 * of the initialization here.
+	 */
+	err = ufshcd_init_hba_vreg(hba);
+	if (err)
+		goto out;
+
+	err = ufshcd_setup_hba_vreg(hba, true);
+	if (err)
+		goto out;
+
+	err = ufshcd_init_clocks(hba);
+	if (err)
+		goto out_disable_hba_vreg;
+
+	err = ufshcd_setup_clocks(hba, true);
+	if (err)
+		goto out_disable_hba_vreg;
+
+	err = ufshcd_init_vreg(hba);
+	if (err)
+		goto out_disable_clks;
+
+	err = ufshcd_setup_vreg(hba, true);
+	if (err)
+		goto out_disable_clks;
+
+	err = ufshcd_variant_hba_init(hba);
+	if (err)
+		goto out_disable_vreg;
+
+	ufs_debugfs_hba_init(hba);
+
+	hba->is_powered = true;
+	goto out;
+
+out_disable_vreg:
+	ufshcd_setup_vreg(hba, false);
+out_disable_clks:
+	ufshcd_setup_clocks(hba, false);
+out_disable_hba_vreg:
+	ufshcd_setup_hba_vreg(hba, false);
+out:
+	return err;
+}
+
+static void ufshcd_hba_exit(struct ufs_hba *hba)
+{
+	if (hba->is_powered) {
+		ufshcd_exit_clk_scaling(hba);
+		ufshcd_exit_clk_gating(hba);
+		if (hba->eh_wq)
+			destroy_workqueue(hba->eh_wq);
+		ufs_debugfs_hba_exit(hba);
+		ufshcd_variant_hba_exit(hba);
+		ufshcd_setup_vreg(hba, false);
+		ufshcd_setup_clocks(hba, false);
+		ufshcd_setup_hba_vreg(hba, false);
+		hba->is_powered = false;
+		ufs_put_device_desc(hba);
+	}
+}
+
+/**
+ * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
+ *			     power mode
+ * @hba: per adapter instance
+ * @pwr_mode: device power mode to set
+ *
+ * Returns 0 if requested power mode is set successfully
+ * Returns < 0 if failed to set the requested power mode
+ */
+static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
+				     enum ufs_dev_pwr_mode pwr_mode)
+{
+	unsigned char cmd[6] = { START_STOP };
+	struct scsi_sense_hdr sshdr;
+	struct scsi_device *sdp;
+	unsigned long flags;
+	int ret, retries;
+
+	spin_lock_irqsave(hba->host->host_lock, flags);
+	sdp = hba->ufs_device_wlun;
+	if (sdp) {
+		ret = scsi_device_get(sdp);
+		if (!ret && !scsi_device_online(sdp)) {
+			ret = -ENODEV;
+			scsi_device_put(sdp);
+		}
+	} else {
+		ret = -ENODEV;
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, flags);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * If scsi commands fail, the scsi mid-layer schedules scsi error-
+	 * handling, which would wait for host to be resumed. Since we know
+	 * we are functional while we are here, skip host resume in error
+	 * handling context.
+	 */
+	hba->host->eh_noresume = 1;
+
+	cmd[4] = pwr_mode << 4;
+
+	/*
+	 * Current function would be generally called from the power management
+	 * callbacks hence set the RQF_PM flag so that it doesn't resume the
+	 * already suspended childs.
+	 */
+	for (retries = 3; retries > 0; --retries) {
+		ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
+				START_STOP_TIMEOUT, 0, 0, RQF_PM, NULL);
+		if (!scsi_status_is_check_condition(ret) ||
+				!scsi_sense_valid(&sshdr) ||
+				sshdr.sense_key != UNIT_ATTENTION)
+			break;
+	}
+	if (ret) {
+		sdev_printk(KERN_WARNING, sdp,
+			    "START_STOP failed for power mode: %d, result %x\n",
+			    pwr_mode, ret);
+		if (ret > 0) {
+			if (scsi_sense_valid(&sshdr))
+				scsi_print_sense_hdr(sdp, NULL, &sshdr);
+			ret = -EIO;
+		}
+	}
+
+	if (!ret)
+		hba->curr_dev_pwr_mode = pwr_mode;
+
+	scsi_device_put(sdp);
+	hba->host->eh_noresume = 0;
+	return ret;
+}
+
+static int ufshcd_link_state_transition(struct ufs_hba *hba,
+					enum uic_link_state req_link_state,
+					int check_for_bkops)
+{
+	int ret = 0;
+
+	if (req_link_state == hba->uic_link_state)
+		return 0;
+
+	if (req_link_state == UIC_LINK_HIBERN8_STATE) {
+		ret = ufshcd_uic_hibern8_enter(hba);
+		if (!ret) {
+			ufshcd_set_link_hibern8(hba);
+		} else {
+			dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
+					__func__, ret);
+			goto out;
+		}
+	}
+	/*
+	 * If autobkops is enabled, link can't be turned off because
+	 * turning off the link would also turn off the device, except in the
+	 * case of DeepSleep where the device is expected to remain powered.
+	 */
+	else if ((req_link_state == UIC_LINK_OFF_STATE) &&
+		 (!check_for_bkops || !hba->auto_bkops_enabled)) {
+		/*
+		 * Let's make sure that link is in low power mode, we are doing
+		 * this currently by putting the link in Hibern8. Otherway to
+		 * put the link in low power mode is to send the DME end point
+		 * to device and then send the DME reset command to local
+		 * unipro. But putting the link in hibern8 is much faster.
+		 *
+		 * Note also that putting the link in Hibern8 is a requirement
+		 * for entering DeepSleep.
+		 */
+		ret = ufshcd_uic_hibern8_enter(hba);
+		if (ret) {
+			dev_err(hba->dev, "%s: hibern8 enter failed %d\n",
+					__func__, ret);
+			goto out;
+		}
+		/*
+		 * Change controller state to "reset state" which
+		 * should also put the link in off/reset state
+		 */
+		ufshcd_hba_stop(hba);
+		/*
+		 * TODO: Check if we need any delay to make sure that
+		 * controller is reset
+		 */
+		ufshcd_set_link_off(hba);
+	}
+
+out:
+	return ret;
+}
+
+static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
+{
+	bool vcc_off = false;
+
+	/*
+	 * It seems some UFS devices may keep drawing more than sleep current
+	 * (atleast for 500us) from UFS rails (especially from VCCQ rail).
+	 * To avoid this situation, add 2ms delay before putting these UFS
+	 * rails in LPM mode.
+	 */
+	if (!ufshcd_is_link_active(hba) &&
+	    hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM)
+		usleep_range(2000, 2100);
+
+	/*
+	 * If UFS device is either in UFS_Sleep turn off VCC rail to save some
+	 * power.
+	 *
+	 * If UFS device and link is in OFF state, all power supplies (VCC,
+	 * VCCQ, VCCQ2) can be turned off if power on write protect is not
+	 * required. If UFS link is inactive (Hibern8 or OFF state) and device
+	 * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode.
+	 *
+	 * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
+	 * in low power state which would save some power.
+	 *
+	 * If Write Booster is enabled and the device needs to flush the WB
+	 * buffer OR if bkops status is urgent for WB, keep Vcc on.
+	 */
+	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
+	    !hba->dev_info.is_lu_power_on_wp) {
+		ufshcd_setup_vreg(hba, false);
+		vcc_off = true;
+	} else if (!ufshcd_is_ufs_dev_active(hba)) {
+		ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
+		vcc_off = true;
+		if (ufshcd_is_link_hibern8(hba) || ufshcd_is_link_off(hba)) {
+			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
+			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
+		}
+	}
+
+	/*
+	 * Some UFS devices require delay after VCC power rail is turned-off.
+	 */
+	if (vcc_off && hba->vreg_info.vcc &&
+		hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM)
+		usleep_range(5000, 5100);
+}
+
+#ifdef CONFIG_PM
+static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
+{
+	int ret = 0;
+
+	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
+	    !hba->dev_info.is_lu_power_on_wp) {
+		ret = ufshcd_setup_vreg(hba, true);
+	} else if (!ufshcd_is_ufs_dev_active(hba)) {
+		if (!ufshcd_is_link_active(hba)) {
+			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
+			if (ret)
+				goto vcc_disable;
+			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
+			if (ret)
+				goto vccq_lpm;
+		}
+		ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true);
+	}
+	goto out;
+
+vccq_lpm:
+	ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
+vcc_disable:
+	ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
+out:
+	return ret;
+}
+#endif /* CONFIG_PM */
+
+static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
+{
+	if (ufshcd_is_link_off(hba) || ufshcd_can_aggressive_pc(hba))
+		ufshcd_setup_hba_vreg(hba, false);
+}
+
+static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
+{
+	if (ufshcd_is_link_off(hba) || ufshcd_can_aggressive_pc(hba))
+		ufshcd_setup_hba_vreg(hba, true);
+}
+
+static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+{
+	int ret = 0;
+	int check_for_bkops;
+	enum ufs_pm_level pm_lvl;
+	enum ufs_dev_pwr_mode req_dev_pwr_mode;
+	enum uic_link_state req_link_state;
+
+	hba->pm_op_in_progress = true;
+	if (pm_op != UFS_SHUTDOWN_PM) {
+		pm_lvl = pm_op == UFS_RUNTIME_PM ?
+			 hba->rpm_lvl : hba->spm_lvl;
+		req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
+		req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
+	} else {
+		req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
+		req_link_state = UIC_LINK_OFF_STATE;
+	}
+
+	ufshpb_suspend(hba);
+
+	/*
+	 * If we can't transition into any of the low power modes
+	 * just gate the clocks.
+	 */
+	ufshcd_hold(hba, false);
+	hba->clk_gating.is_suspended = true;
+
+	if (ufshcd_is_clkscaling_supported(hba))
+		ufshcd_clk_scaling_suspend(hba, true);
+
+	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
+			req_link_state == UIC_LINK_ACTIVE_STATE) {
+		goto vops_suspend;
+	}
+
+	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
+	    (req_link_state == hba->uic_link_state))
+		goto enable_scaling;
+
+	/* UFS device & link must be active before we enter in this function */
+	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
+		ret = -EINVAL;
+		goto enable_scaling;
+	}
+
+	if (pm_op == UFS_RUNTIME_PM) {
+		if (ufshcd_can_autobkops_during_suspend(hba)) {
+			/*
+			 * The device is idle with no requests in the queue,
+			 * allow background operations if bkops status shows
+			 * that performance might be impacted.
+			 */
+			ret = ufshcd_urgent_bkops(hba);
+			if (ret)
+				goto enable_scaling;
+		} else {
+			/* make sure that auto bkops is disabled */
+			ufshcd_disable_auto_bkops(hba);
+		}
+		/*
+		 * If device needs to do BKOP or WB buffer flush during
+		 * Hibern8, keep device power mode as "active power mode"
+		 * and VCC supply.
+		 */
+		hba->dev_info.b_rpm_dev_flush_capable =
+			hba->auto_bkops_enabled ||
+			(((req_link_state == UIC_LINK_HIBERN8_STATE) ||
+			((req_link_state == UIC_LINK_ACTIVE_STATE) &&
+			ufshcd_is_auto_hibern8_enabled(hba))) &&
+			ufshcd_wb_need_flush(hba));
+	}
+
+	flush_work(&hba->eeh_work);
+
+	ret = ufshcd_vops_suspend(hba, pm_op, PRE_CHANGE);
+	if (ret)
+		goto enable_scaling;
+
+	if (req_dev_pwr_mode != hba->curr_dev_pwr_mode) {
+		if (pm_op != UFS_RUNTIME_PM)
+			/* ensure that bkops is disabled */
+			ufshcd_disable_auto_bkops(hba);
+
+		if (!hba->dev_info.b_rpm_dev_flush_capable) {
+			ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
+			if (ret)
+				goto enable_scaling;
+		}
+	}
+
+	/*
+	 * In the case of DeepSleep, the device is expected to remain powered
+	 * with the link off, so do not check for bkops.
+	 */
+	check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
+	ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
+	if (ret)
+		goto set_dev_active;
+
+vops_suspend:
+	/*
+	 * Call vendor specific suspend callback. As these callbacks may access
+	 * vendor specific host controller register space call them before the
+	 * host clocks are ON.
+	 */
+	ret = ufshcd_vops_suspend(hba, pm_op, POST_CHANGE);
+	if (ret)
+		goto set_link_active;
+	goto out;
+
+set_link_active:
+	/*
+	 * Device hardware reset is required to exit DeepSleep. Also, for
+	 * DeepSleep, the link is off so host reset and restore will be done
+	 * further below.
+	 */
+	if (ufshcd_is_ufs_dev_deepsleep(hba)) {
+		ufshcd_device_reset(hba);
+		WARN_ON(!ufshcd_is_link_off(hba));
+	}
+	if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba))
+		ufshcd_set_link_active(hba);
+	else if (ufshcd_is_link_off(hba))
+		ufshcd_host_reset_and_restore(hba);
+set_dev_active:
+	/* Can also get here needing to exit DeepSleep */
+	if (ufshcd_is_ufs_dev_deepsleep(hba)) {
+		ufshcd_device_reset(hba);
+		ufshcd_host_reset_and_restore(hba);
+	}
+	if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
+		ufshcd_disable_auto_bkops(hba);
+enable_scaling:
+	if (ufshcd_is_clkscaling_supported(hba))
+		ufshcd_clk_scaling_suspend(hba, false);
+
+	hba->dev_info.b_rpm_dev_flush_capable = false;
+out:
+	if (hba->dev_info.b_rpm_dev_flush_capable) {
+		schedule_delayed_work(&hba->rpm_dev_flush_recheck_work,
+			msecs_to_jiffies(RPM_DEV_FLUSH_RECHECK_WORK_DELAY_MS));
+	}
+
+	if (ret) {
+		ufshcd_update_evt_hist(hba, UFS_EVT_WL_SUSP_ERR, (u32)ret);
+		hba->clk_gating.is_suspended = false;
+		ufshcd_release(hba);
+		ufshpb_resume(hba);
+	}
+	hba->pm_op_in_progress = false;
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+{
+	int ret;
+	enum uic_link_state old_link_state = hba->uic_link_state;
+
+	hba->pm_op_in_progress = true;
+
+	/*
+	 * Call vendor specific resume callback. As these callbacks may access
+	 * vendor specific host controller register space call them when the
+	 * host clocks are ON.
+	 */
+	ret = ufshcd_vops_resume(hba, pm_op);
+	if (ret)
+		goto out;
+
+	/* For DeepSleep, the only supported option is to have the link off */
+	WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba));
+
+	if (ufshcd_is_link_hibern8(hba)) {
+		ret = ufshcd_uic_hibern8_exit(hba);
+		if (!ret) {
+			ufshcd_set_link_active(hba);
+		} else {
+			dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
+					__func__, ret);
+			goto vendor_suspend;
+		}
+	} else if (ufshcd_is_link_off(hba)) {
+		/*
+		 * A full initialization of the host and the device is
+		 * required since the link was put to off during suspend.
+		 * Note, in the case of DeepSleep, the device will exit
+		 * DeepSleep due to device reset.
+		 */
+		ret = ufshcd_reset_and_restore(hba);
+		/*
+		 * ufshcd_reset_and_restore() should have already
+		 * set the link state as active
+		 */
+		if (ret || !ufshcd_is_link_active(hba))
+			goto vendor_suspend;
+	}
+
+	if (!ufshcd_is_ufs_dev_active(hba)) {
+		ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
+		if (ret)
+			goto set_old_link_state;
+	}
+
+	if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
+		ufshcd_enable_auto_bkops(hba);
+	else
+		/*
+		 * If BKOPs operations are urgently needed at this moment then
+		 * keep auto-bkops enabled or else disable it.
+		 */
+		ufshcd_urgent_bkops(hba);
+
+	if (hba->ee_usr_mask)
+		ufshcd_write_ee_control(hba);
+
+	if (ufshcd_is_clkscaling_supported(hba))
+		ufshcd_clk_scaling_suspend(hba, false);
+
+	if (hba->dev_info.b_rpm_dev_flush_capable) {
+		hba->dev_info.b_rpm_dev_flush_capable = false;
+		cancel_delayed_work(&hba->rpm_dev_flush_recheck_work);
+	}
+
+	/* Enable Auto-Hibernate if configured */
+	ufshcd_auto_hibern8_enable(hba);
+
+	ufshpb_resume(hba);
+	goto out;
+
+set_old_link_state:
+	ufshcd_link_state_transition(hba, old_link_state, 0);
+vendor_suspend:
+	ufshcd_vops_suspend(hba, pm_op, PRE_CHANGE);
+	ufshcd_vops_suspend(hba, pm_op, POST_CHANGE);
+out:
+	if (ret)
+		ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
+	hba->clk_gating.is_suspended = false;
+	ufshcd_release(hba);
+	hba->pm_op_in_progress = false;
+	return ret;
+}
+
+static int ufshcd_wl_runtime_suspend(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+
+	ret = __ufshcd_wl_suspend(hba, UFS_RUNTIME_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+	trace_ufshcd_wl_runtime_suspend(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+
+static int ufshcd_wl_runtime_resume(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+
+	ret = __ufshcd_wl_resume(hba, UFS_RUNTIME_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+
+	trace_ufshcd_wl_runtime_resume(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_suspend(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+	down(&hba->host_sem);
+
+	if (pm_runtime_suspended(dev))
+		goto out;
+
+	ret = __ufshcd_wl_suspend(hba, UFS_SYSTEM_PM);
+	if (ret) {
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__,  ret);
+		up(&hba->host_sem);
+	}
+
+out:
+	if (!ret)
+		hba->is_sys_suspended = true;
+	trace_ufshcd_wl_suspend(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+
+static int ufshcd_wl_resume(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	hba = shost_priv(sdev->host);
+
+	if (pm_runtime_suspended(dev))
+		goto out;
+
+	ret = __ufshcd_wl_resume(hba, UFS_SYSTEM_PM);
+	if (ret)
+		dev_err(&sdev->sdev_gendev, "%s failed: %d\n", __func__, ret);
+out:
+	trace_ufshcd_wl_resume(dev_name(dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	if (!ret)
+		hba->is_sys_suspended = false;
+	up(&hba->host_sem);
+	return ret;
+}
+#endif
+
+static void ufshcd_wl_shutdown(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba;
+
+	hba = shost_priv(sdev->host);
+
+	down(&hba->host_sem);
+	hba->shutting_down = true;
+	up(&hba->host_sem);
+
+	/* Turn on everything while shutting down */
+	ufshcd_rpm_get_sync(hba);
+	scsi_device_quiesce(sdev);
+	shost_for_each_device(sdev, hba->host) {
+		if (sdev == hba->ufs_device_wlun)
+			continue;
+		scsi_device_quiesce(sdev);
+	}
+	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+}
+
+/**
+ * ufshcd_suspend - helper function for suspend operations
+ * @hba: per adapter instance
+ *
+ * This function will put disable irqs, turn off clocks
+ * and set vreg and hba-vreg in lpm mode.
+ */
+static int ufshcd_suspend(struct ufs_hba *hba)
+{
+	int ret;
+
+	if (!hba->is_powered)
+		return 0;
+	/*
+	 * Disable the host irq as host controller as there won't be any
+	 * host controller transaction expected till resume.
+	 */
+	ufshcd_disable_irq(hba);
+	ret = ufshcd_setup_clocks(hba, false);
+	if (ret) {
+		ufshcd_enable_irq(hba);
+		return ret;
+	}
+	if (ufshcd_is_clkgating_allowed(hba)) {
+		hba->clk_gating.state = CLKS_OFF;
+		trace_ufshcd_clk_gating(dev_name(hba->dev),
+					hba->clk_gating.state);
+	}
+
+	ufshcd_vreg_set_lpm(hba);
+	/* Put the host controller in low power mode if possible */
+	ufshcd_hba_vreg_set_lpm(hba);
+	return ret;
+}
+
+#ifdef CONFIG_PM
+/**
+ * ufshcd_resume - helper function for resume operations
+ * @hba: per adapter instance
+ *
+ * This function basically turns on the regulators, clocks and
+ * irqs of the hba.
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+static int ufshcd_resume(struct ufs_hba *hba)
+{
+	int ret;
+
+	if (!hba->is_powered)
+		return 0;
+
+	ufshcd_hba_vreg_set_hpm(hba);
+	ret = ufshcd_vreg_set_hpm(hba);
+	if (ret)
+		goto out;
+
+	/* Make sure clocks are enabled before accessing controller */
+	ret = ufshcd_setup_clocks(hba, true);
+	if (ret)
+		goto disable_vreg;
+
+	/* enable the host irq as host controller would be active soon */
+	ufshcd_enable_irq(hba);
+	goto out;
+
+disable_vreg:
+	ufshcd_vreg_set_lpm(hba);
+out:
+	if (ret)
+		ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
+	return ret;
+}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_SLEEP
+/**
+ * ufshcd_system_suspend - system suspend callback
+ * @dev: Device associated with the UFS controller.
+ *
+ * Executed before putting the system into a sleep state in which the contents
+ * of main memory are preserved.
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+int ufshcd_system_suspend(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret = 0;
+	ktime_t start = ktime_get();
+
+	if (pm_runtime_suspended(hba->dev))
+		goto out;
+
+	ret = ufshcd_suspend(hba);
+out:
+	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	return ret;
+}
+EXPORT_SYMBOL(ufshcd_system_suspend);
+
+/**
+ * ufshcd_system_resume - system resume callback
+ * @dev: Device associated with the UFS controller.
+ *
+ * Executed after waking the system up from a sleep state in which the contents
+ * of main memory were preserved.
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+int ufshcd_system_resume(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	ktime_t start = ktime_get();
+	int ret = 0;
+
+	if (pm_runtime_suspended(hba->dev))
+		goto out;
+
+	ret = ufshcd_resume(hba);
+
+out:
+	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+
+	return ret;
+}
+EXPORT_SYMBOL(ufshcd_system_resume);
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+/**
+ * ufshcd_runtime_suspend - runtime suspend callback
+ * @dev: Device associated with the UFS controller.
+ *
+ * Check the description of ufshcd_suspend() function for more details.
+ *
+ * Returns 0 for success and non-zero for failure
+ */
+int ufshcd_runtime_suspend(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+	ktime_t start = ktime_get();
+
+	ret = ufshcd_suspend(hba);
+
+	trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	return ret;
+}
+EXPORT_SYMBOL(ufshcd_runtime_suspend);
+
+/**
+ * ufshcd_runtime_resume - runtime resume routine
+ * @dev: Device associated with the UFS controller.
+ *
+ * This function basically brings controller
+ * to active state. Following operations are done in this function:
+ *
+ * 1. Turn on all the controller related clocks
+ * 2. Turn ON VCC rail
+ */
+int ufshcd_runtime_resume(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+	ktime_t start = ktime_get();
+
+	ret = ufshcd_resume(hba);
+
+	trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
+		ktime_to_us(ktime_sub(ktime_get(), start)),
+		hba->curr_dev_pwr_mode, hba->uic_link_state);
+	return ret;
+}
+EXPORT_SYMBOL(ufshcd_runtime_resume);
+#endif /* CONFIG_PM */
+
+/**
+ * ufshcd_shutdown - shutdown routine
+ * @hba: per adapter instance
+ *
+ * This function would turn off both UFS device and UFS hba
+ * regulators. It would also disable clocks.
+ *
+ * Returns 0 always to allow force shutdown even in case of errors.
+ */
+int ufshcd_shutdown(struct ufs_hba *hba)
+{
+	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
+		goto out;
+
+	pm_runtime_get_sync(hba->dev);
+
+	ufshcd_suspend(hba);
+out:
+	hba->is_powered = false;
+	/* allow force shutdown even in case of errors */
+	return 0;
+}
+EXPORT_SYMBOL(ufshcd_shutdown);
+
+/**
+ * ufshcd_remove - de-allocate SCSI host and host memory space
+ *		data structure memory
+ * @hba: per adapter instance
+ */
+void ufshcd_remove(struct ufs_hba *hba)
+{
+	if (hba->ufs_device_wlun)
+		ufshcd_rpm_get_sync(hba);
+	ufs_hwmon_remove(hba);
+	ufs_bsg_remove(hba);
+	ufshpb_remove(hba);
+	ufs_sysfs_remove_nodes(hba->dev);
+	blk_cleanup_queue(hba->tmf_queue);
+	blk_mq_free_tag_set(&hba->tmf_tag_set);
+	scsi_remove_host(hba->host);
+	/* disable interrupts */
+	ufshcd_disable_intr(hba, hba->intr_mask);
+	ufshcd_hba_stop(hba);
+	ufshcd_hba_exit(hba);
+}
+EXPORT_SYMBOL_GPL(ufshcd_remove);
+
+/**
+ * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
+ * @hba: pointer to Host Bus Adapter (HBA)
+ */
+void ufshcd_dealloc_host(struct ufs_hba *hba)
+{
+	scsi_host_put(hba->host);
+}
+EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);
+
+/**
+ * ufshcd_set_dma_mask - Set dma mask based on the controller
+ *			 addressing capability
+ * @hba: per adapter instance
+ *
+ * Returns 0 for success, non-zero for failure
+ */
+static int ufshcd_set_dma_mask(struct ufs_hba *hba)
+{
+	if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
+		if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
+			return 0;
+	}
+	return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
+}
+
+/**
+ * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
+ * @dev: pointer to device handle
+ * @hba_handle: driver private handle
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
+{
+	struct Scsi_Host *host;
+	struct ufs_hba *hba;
+	int err = 0;
+
+	if (!dev) {
+		dev_err(dev,
+		"Invalid memory reference for dev is NULL\n");
+		err = -ENODEV;
+		goto out_error;
+	}
+
+	host = scsi_host_alloc(&ufshcd_driver_template,
+				sizeof(struct ufs_hba));
+	if (!host) {
+		dev_err(dev, "scsi_host_alloc failed\n");
+		err = -ENOMEM;
+		goto out_error;
+	}
+	host->nr_maps = HCTX_TYPE_POLL + 1;
+	hba = shost_priv(host);
+	hba->host = host;
+	hba->dev = dev;
+	hba->dev_ref_clk_freq = REF_CLK_FREQ_INVAL;
+	hba->nop_out_timeout = NOP_OUT_TIMEOUT;
+	INIT_LIST_HEAD(&hba->clk_list_head);
+	spin_lock_init(&hba->outstanding_lock);
+
+	*hba_handle = hba;
+
+out_error:
+	return err;
+}
+EXPORT_SYMBOL(ufshcd_alloc_host);
+
+/* This function exists because blk_mq_alloc_tag_set() requires this. */
+static blk_status_t ufshcd_queue_tmf(struct blk_mq_hw_ctx *hctx,
+				     const struct blk_mq_queue_data *qd)
+{
+	WARN_ON_ONCE(true);
+	return BLK_STS_NOTSUPP;
+}
+
+static const struct blk_mq_ops ufshcd_tmf_ops = {
+	.queue_rq = ufshcd_queue_tmf,
+};
+
+/**
+ * ufshcd_init - Driver initialization routine
+ * @hba: per-adapter instance
+ * @mmio_base: base register address
+ * @irq: Interrupt line of device
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
+{
+	int err;
+	struct Scsi_Host *host = hba->host;
+	struct device *dev = hba->dev;
+	char eh_wq_name[sizeof("ufs_eh_wq_00")];
+
+	/*
+	 * dev_set_drvdata() must be called before any callbacks are registered
+	 * that use dev_get_drvdata() (frequency scaling, clock scaling, hwmon,
+	 * sysfs).
+	 */
+	dev_set_drvdata(dev, hba);
+
+	if (!mmio_base) {
+		dev_err(hba->dev,
+		"Invalid memory reference for mmio_base is NULL\n");
+		err = -ENODEV;
+		goto out_error;
+	}
+
+	hba->mmio_base = mmio_base;
+	hba->irq = irq;
+	hba->vps = &ufs_hba_vps;
+
+	err = ufshcd_hba_init(hba);
+	if (err)
+		goto out_error;
+
+	/* Read capabilities registers */
+	err = ufshcd_hba_capabilities(hba);
+	if (err)
+		goto out_disable;
+
+	/* Get UFS version supported by the controller */
+	hba->ufs_version = ufshcd_get_ufs_version(hba);
+
+	/* Get Interrupt bit mask per version */
+	hba->intr_mask = ufshcd_get_intr_mask(hba);
+
+	err = ufshcd_set_dma_mask(hba);
+	if (err) {
+		dev_err(hba->dev, "set dma mask failed\n");
+		goto out_disable;
+	}
+
+	/* Allocate memory for host memory space */
+	err = ufshcd_memory_alloc(hba);
+	if (err) {
+		dev_err(hba->dev, "Memory allocation failed\n");
+		goto out_disable;
+	}
+
+	/* Configure LRB */
+	ufshcd_host_memory_configure(hba);
+
+	host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
+	host->cmd_per_lun = hba->nutrs - UFSHCD_NUM_RESERVED;
+	host->max_id = UFSHCD_MAX_ID;
+	host->max_lun = UFS_MAX_LUNS;
+	host->max_channel = UFSHCD_MAX_CHANNEL;
+	host->unique_id = host->host_no;
+	host->max_cmd_len = UFS_CDB_SIZE;
+
+	hba->max_pwr_info.is_valid = false;
+
+	/* Initialize work queues */
+	snprintf(eh_wq_name, sizeof(eh_wq_name), "ufs_eh_wq_%d",
+		 hba->host->host_no);
+	hba->eh_wq = create_singlethread_workqueue(eh_wq_name);
+	if (!hba->eh_wq) {
+		dev_err(hba->dev, "%s: failed to create eh workqueue\n",
+			__func__);
+		err = -ENOMEM;
+		goto out_disable;
+	}
+	INIT_WORK(&hba->eh_work, ufshcd_err_handler);
+	INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
+
+	sema_init(&hba->host_sem, 1);
+
+	/* Initialize UIC command mutex */
+	mutex_init(&hba->uic_cmd_mutex);
+
+	/* Initialize mutex for device management commands */
+	mutex_init(&hba->dev_cmd.lock);
+
+	/* Initialize mutex for exception event control */
+	mutex_init(&hba->ee_ctrl_mutex);
+
+	init_rwsem(&hba->clk_scaling_lock);
+
+	ufshcd_init_clk_gating(hba);
+
+	ufshcd_init_clk_scaling(hba);
+
+	/*
+	 * In order to avoid any spurious interrupt immediately after
+	 * registering UFS controller interrupt handler, clear any pending UFS
+	 * interrupt status and disable all the UFS interrupts.
+	 */
+	ufshcd_writel(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS),
+		      REG_INTERRUPT_STATUS);
+	ufshcd_writel(hba, 0, REG_INTERRUPT_ENABLE);
+	/*
+	 * Make sure that UFS interrupts are disabled and any pending interrupt
+	 * status is cleared before registering UFS interrupt handler.
+	 */
+	mb();
+
+	/* IRQ registration */
+	err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
+	if (err) {
+		dev_err(hba->dev, "request irq failed\n");
+		goto out_disable;
+	} else {
+		hba->is_irq_enabled = true;
+	}
+
+	err = scsi_add_host(host, hba->dev);
+	if (err) {
+		dev_err(hba->dev, "scsi_add_host failed\n");
+		goto out_disable;
+	}
+
+	hba->tmf_tag_set = (struct blk_mq_tag_set) {
+		.nr_hw_queues	= 1,
+		.queue_depth	= hba->nutmrs,
+		.ops		= &ufshcd_tmf_ops,
+		.flags		= BLK_MQ_F_NO_SCHED,
+	};
+	err = blk_mq_alloc_tag_set(&hba->tmf_tag_set);
+	if (err < 0)
+		goto out_remove_scsi_host;
+	hba->tmf_queue = blk_mq_init_queue(&hba->tmf_tag_set);
+	if (IS_ERR(hba->tmf_queue)) {
+		err = PTR_ERR(hba->tmf_queue);
+		goto free_tmf_tag_set;
+	}
+	hba->tmf_rqs = devm_kcalloc(hba->dev, hba->nutmrs,
+				    sizeof(*hba->tmf_rqs), GFP_KERNEL);
+	if (!hba->tmf_rqs) {
+		err = -ENOMEM;
+		goto free_tmf_queue;
+	}
+
+	/* Reset the attached device */
+	ufshcd_device_reset(hba);
+
+	ufshcd_init_crypto(hba);
+
+	/* Host controller enable */
+	err = ufshcd_hba_enable(hba);
+	if (err) {
+		dev_err(hba->dev, "Host controller enable failed\n");
+		ufshcd_print_evt_hist(hba);
+		ufshcd_print_host_state(hba);
+		goto free_tmf_queue;
+	}
+
+	/*
+	 * Set the default power management level for runtime and system PM.
+	 * Default power saving mode is to keep UFS link in Hibern8 state
+	 * and UFS device in sleep state.
+	 */
+	hba->rpm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
+						UFS_SLEEP_PWR_MODE,
+						UIC_LINK_HIBERN8_STATE);
+	hba->spm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
+						UFS_SLEEP_PWR_MODE,
+						UIC_LINK_HIBERN8_STATE);
+
+	INIT_DELAYED_WORK(&hba->rpm_dev_flush_recheck_work,
+			  ufshcd_rpm_dev_flush_recheck_work);
+
+	/* Set the default auto-hiberate idle timer value to 150 ms */
+	if (ufshcd_is_auto_hibern8_supported(hba) && !hba->ahit) {
+		hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 150) |
+			    FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
+	}
+
+	/* Hold auto suspend until async scan completes */
+	pm_runtime_get_sync(dev);
+	atomic_set(&hba->scsi_block_reqs_cnt, 0);
+	/*
+	 * We are assuming that device wasn't put in sleep/power-down
+	 * state exclusively during the boot stage before kernel.
+	 * This assumption helps avoid doing link startup twice during
+	 * ufshcd_probe_hba().
+	 */
+	ufshcd_set_ufs_dev_active(hba);
+
+	async_schedule(ufshcd_async_scan, hba);
+	ufs_sysfs_add_nodes(hba->dev);
+
+	device_enable_async_suspend(dev);
+	return 0;
+
+free_tmf_queue:
+	blk_cleanup_queue(hba->tmf_queue);
+free_tmf_tag_set:
+	blk_mq_free_tag_set(&hba->tmf_tag_set);
+out_remove_scsi_host:
+	scsi_remove_host(hba->host);
+out_disable:
+	hba->is_irq_enabled = false;
+	ufshcd_hba_exit(hba);
+out_error:
+	return err;
+}
+EXPORT_SYMBOL_GPL(ufshcd_init);
+
+void ufshcd_resume_complete(struct device *dev)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+
+	if (hba->complete_put) {
+		ufshcd_rpm_put(hba);
+		hba->complete_put = false;
+	}
+}
+EXPORT_SYMBOL_GPL(ufshcd_resume_complete);
+
+static bool ufshcd_rpm_ok_for_spm(struct ufs_hba *hba)
+{
+	struct device *dev = &hba->ufs_device_wlun->sdev_gendev;
+	enum ufs_dev_pwr_mode dev_pwr_mode;
+	enum uic_link_state link_state;
+	unsigned long flags;
+	bool res;
+
+	spin_lock_irqsave(&dev->power.lock, flags);
+	dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl);
+	link_state = ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl);
+	res = pm_runtime_suspended(dev) &&
+	      hba->curr_dev_pwr_mode == dev_pwr_mode &&
+	      hba->uic_link_state == link_state &&
+	      !hba->dev_info.b_rpm_dev_flush_capable;
+	spin_unlock_irqrestore(&dev->power.lock, flags);
+
+	return res;
+}
+
+int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+
+	/*
+	 * SCSI assumes that runtime-pm and system-pm for scsi drivers
+	 * are same. And it doesn't wake up the device for system-suspend
+	 * if it's runtime suspended. But ufs doesn't follow that.
+	 * Refer ufshcd_resume_complete()
+	 */
+	if (hba->ufs_device_wlun) {
+		/* Prevent runtime suspend */
+		ufshcd_rpm_get_noresume(hba);
+		/*
+		 * Check if already runtime suspended in same state as system
+		 * suspend would be.
+		 */
+		if (!rpm_ok_for_spm || !ufshcd_rpm_ok_for_spm(hba)) {
+			/* RPM state is not ok for SPM, so runtime resume */
+			ret = ufshcd_rpm_resume(hba);
+			if (ret < 0 && ret != -EACCES) {
+				ufshcd_rpm_put(hba);
+				return ret;
+			}
+		}
+		hba->complete_put = true;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__ufshcd_suspend_prepare);
+
+int ufshcd_suspend_prepare(struct device *dev)
+{
+	return __ufshcd_suspend_prepare(dev, true);
+}
+EXPORT_SYMBOL_GPL(ufshcd_suspend_prepare);
+
+#ifdef CONFIG_PM_SLEEP
+static int ufshcd_wl_poweroff(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufs_hba *hba = shost_priv(sdev->host);
+
+	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
+	return 0;
+}
+#endif
+
+static int ufshcd_wl_probe(struct device *dev)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+
+	if (!is_device_wlun(sdev))
+		return -ENODEV;
+
+	blk_pm_runtime_init(sdev->request_queue, dev);
+	pm_runtime_set_autosuspend_delay(dev, 0);
+	pm_runtime_allow(dev);
+
+	return  0;
+}
+
+static int ufshcd_wl_remove(struct device *dev)
+{
+	pm_runtime_forbid(dev);
+	return 0;
+}
+
+static const struct dev_pm_ops ufshcd_wl_pm_ops = {
+#ifdef CONFIG_PM_SLEEP
+	.suspend = ufshcd_wl_suspend,
+	.resume = ufshcd_wl_resume,
+	.freeze = ufshcd_wl_suspend,
+	.thaw = ufshcd_wl_resume,
+	.poweroff = ufshcd_wl_poweroff,
+	.restore = ufshcd_wl_resume,
+#endif
+	SET_RUNTIME_PM_OPS(ufshcd_wl_runtime_suspend, ufshcd_wl_runtime_resume, NULL)
+};
+
+/*
+ * ufs_dev_wlun_template - describes ufs device wlun
+ * ufs-device wlun - used to send pm commands
+ * All luns are consumers of ufs-device wlun.
+ *
+ * Currently, no sd driver is present for wluns.
+ * Hence the no specific pm operations are performed.
+ * With ufs design, SSU should be sent to ufs-device wlun.
+ * Hence register a scsi driver for ufs wluns only.
+ */
+static struct scsi_driver ufs_dev_wlun_template = {
+	.gendrv = {
+		.name = "ufs_device_wlun",
+		.owner = THIS_MODULE,
+		.probe = ufshcd_wl_probe,
+		.remove = ufshcd_wl_remove,
+		.pm = &ufshcd_wl_pm_ops,
+		.shutdown = ufshcd_wl_shutdown,
+	},
+};
+
+static int __init ufshcd_core_init(void)
+{
+	int ret;
+
+	/* Verify that there are no gaps in struct utp_transfer_cmd_desc. */
+	static_assert(sizeof(struct utp_transfer_cmd_desc) ==
+		      2 * ALIGNED_UPIU_SIZE +
+			      SG_ALL * sizeof(struct ufshcd_sg_entry));
+
+	ufs_debugfs_init();
+
+	ret = scsi_register_driver(&ufs_dev_wlun_template.gendrv);
+	if (ret)
+		ufs_debugfs_exit();
+	return ret;
+}
+
+static void __exit ufshcd_core_exit(void)
+{
+	ufs_debugfs_exit();
+	scsi_unregister_driver(&ufs_dev_wlun_template.gendrv);
+}
+
+module_init(ufshcd_core_init);
+module_exit(ufshcd_core_exit);
+
+MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
+MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
+MODULE_DESCRIPTION("Generic UFS host controller driver Core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/ufs/core/ufshpb.c b/drivers/ufs/core/ufshpb.c
new file mode 100644
index 000000000000..aee0ec4cee70
--- /dev/null
+++ b/drivers/ufs/core/ufshpb.c
@@ -0,0 +1,2670 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Universal Flash Storage Host Performance Booster
+ *
+ * Copyright (C) 2017-2021 Samsung Electronics Co., Ltd.
+ *
+ * Authors:
+ *	Yongmyung Lee <ymhungry.lee@samsung.com>
+ *	Jinyoung Choi <j-young.choi@samsung.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <scsi/scsi_cmnd.h>
+
+#include "ufshcd-priv.h"
+#include "ufshpb.h"
+#include "../../scsi/sd.h"
+
+#define ACTIVATION_THRESHOLD 8 /* 8 IOs */
+#define READ_TO_MS 1000
+#define READ_TO_EXPIRIES 100
+#define POLLING_INTERVAL_MS 200
+#define THROTTLE_MAP_REQ_DEFAULT 1
+
+/* memory management */
+static struct kmem_cache *ufshpb_mctx_cache;
+static mempool_t *ufshpb_mctx_pool;
+static mempool_t *ufshpb_page_pool;
+/* A cache size of 2MB can cache ppn in the 1GB range. */
+static unsigned int ufshpb_host_map_kbytes = 2048;
+static int tot_active_srgn_pages;
+
+static struct workqueue_struct *ufshpb_wq;
+
+static void ufshpb_update_active_info(struct ufshpb_lu *hpb, int rgn_idx,
+				      int srgn_idx);
+
+bool ufshpb_is_allowed(struct ufs_hba *hba)
+{
+	return !(hba->ufshpb_dev.hpb_disabled);
+}
+
+/* HPB version 1.0 is called as legacy version. */
+bool ufshpb_is_legacy(struct ufs_hba *hba)
+{
+	return hba->ufshpb_dev.is_legacy;
+}
+
+static struct ufshpb_lu *ufshpb_get_hpb_data(struct scsi_device *sdev)
+{
+	return sdev->hostdata;
+}
+
+static int ufshpb_get_state(struct ufshpb_lu *hpb)
+{
+	return atomic_read(&hpb->hpb_state);
+}
+
+static void ufshpb_set_state(struct ufshpb_lu *hpb, int state)
+{
+	atomic_set(&hpb->hpb_state, state);
+}
+
+static int ufshpb_is_valid_srgn(struct ufshpb_region *rgn,
+				struct ufshpb_subregion *srgn)
+{
+	return rgn->rgn_state != HPB_RGN_INACTIVE &&
+		srgn->srgn_state == HPB_SRGN_VALID;
+}
+
+static bool ufshpb_is_read_cmd(struct scsi_cmnd *cmd)
+{
+	return req_op(scsi_cmd_to_rq(cmd)) == REQ_OP_READ;
+}
+
+static bool ufshpb_is_write_or_discard(struct scsi_cmnd *cmd)
+{
+	return op_is_write(req_op(scsi_cmd_to_rq(cmd))) ||
+	       op_is_discard(req_op(scsi_cmd_to_rq(cmd)));
+}
+
+static bool ufshpb_is_supported_chunk(struct ufshpb_lu *hpb, int transfer_len)
+{
+	return transfer_len <= hpb->pre_req_max_tr_len;
+}
+
+static bool ufshpb_is_general_lun(int lun)
+{
+	return lun < UFS_UPIU_MAX_UNIT_NUM_ID;
+}
+
+static bool ufshpb_is_pinned_region(struct ufshpb_lu *hpb, int rgn_idx)
+{
+	return hpb->lu_pinned_end != PINNED_NOT_SET &&
+	       rgn_idx >= hpb->lu_pinned_start && rgn_idx <= hpb->lu_pinned_end;
+}
+
+static void ufshpb_kick_map_work(struct ufshpb_lu *hpb)
+{
+	bool ret = false;
+	unsigned long flags;
+
+	if (ufshpb_get_state(hpb) != HPB_PRESENT)
+		return;
+
+	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	if (!list_empty(&hpb->lh_inact_rgn) || !list_empty(&hpb->lh_act_srgn))
+		ret = true;
+	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+	if (ret)
+		queue_work(ufshpb_wq, &hpb->map_work);
+}
+
+static bool ufshpb_is_hpb_rsp_valid(struct ufs_hba *hba,
+				    struct ufshcd_lrb *lrbp,
+				    struct utp_hpb_rsp *rsp_field)
+{
+	/* Check HPB_UPDATE_ALERT */
+	if (!(lrbp->ucd_rsp_ptr->header.dword_2 &
+	      UPIU_HEADER_DWORD(0, 2, 0, 0)))
+		return false;
+
+	if (be16_to_cpu(rsp_field->sense_data_len) != DEV_SENSE_SEG_LEN ||
+	    rsp_field->desc_type != DEV_DES_TYPE ||
+	    rsp_field->additional_len != DEV_ADDITIONAL_LEN ||
+	    rsp_field->active_rgn_cnt > MAX_ACTIVE_NUM ||
+	    rsp_field->inactive_rgn_cnt > MAX_INACTIVE_NUM ||
+	    rsp_field->hpb_op == HPB_RSP_NONE ||
+	    (rsp_field->hpb_op == HPB_RSP_REQ_REGION_UPDATE &&
+	     !rsp_field->active_rgn_cnt && !rsp_field->inactive_rgn_cnt))
+		return false;
+
+	if (!ufshpb_is_general_lun(rsp_field->lun)) {
+		dev_warn(hba->dev, "ufshpb: lun(%d) not supported\n",
+			 lrbp->lun);
+		return false;
+	}
+
+	return true;
+}
+
+static void ufshpb_iterate_rgn(struct ufshpb_lu *hpb, int rgn_idx, int srgn_idx,
+			       int srgn_offset, int cnt, bool set_dirty)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn, *prev_srgn = NULL;
+	int set_bit_len;
+	int bitmap_len;
+	unsigned long flags;
+
+next_srgn:
+	rgn = hpb->rgn_tbl + rgn_idx;
+	srgn = rgn->srgn_tbl + srgn_idx;
+
+	if (likely(!srgn->is_last))
+		bitmap_len = hpb->entries_per_srgn;
+	else
+		bitmap_len = hpb->last_srgn_entries;
+
+	if ((srgn_offset + cnt) > bitmap_len)
+		set_bit_len = bitmap_len - srgn_offset;
+	else
+		set_bit_len = cnt;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	if (rgn->rgn_state != HPB_RGN_INACTIVE) {
+		if (set_dirty) {
+			if (srgn->srgn_state == HPB_SRGN_VALID)
+				bitmap_set(srgn->mctx->ppn_dirty, srgn_offset,
+					   set_bit_len);
+		} else if (hpb->is_hcm) {
+			 /* rewind the read timer for lru regions */
+			rgn->read_timeout = ktime_add_ms(ktime_get(),
+					rgn->hpb->params.read_timeout_ms);
+			rgn->read_timeout_expiries =
+				rgn->hpb->params.read_timeout_expiries;
+		}
+	}
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+
+	if (hpb->is_hcm && prev_srgn != srgn) {
+		bool activate = false;
+
+		spin_lock(&rgn->rgn_lock);
+		if (set_dirty) {
+			rgn->reads -= srgn->reads;
+			srgn->reads = 0;
+			set_bit(RGN_FLAG_DIRTY, &rgn->rgn_flags);
+		} else {
+			srgn->reads++;
+			rgn->reads++;
+			if (srgn->reads == hpb->params.activation_thld)
+				activate = true;
+		}
+		spin_unlock(&rgn->rgn_lock);
+
+		if (activate ||
+		    test_and_clear_bit(RGN_FLAG_UPDATE, &rgn->rgn_flags)) {
+			spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+			ufshpb_update_active_info(hpb, rgn_idx, srgn_idx);
+			spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+			dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
+				"activate region %d-%d\n", rgn_idx, srgn_idx);
+		}
+
+		prev_srgn = srgn;
+	}
+
+	srgn_offset = 0;
+	if (++srgn_idx == hpb->srgns_per_rgn) {
+		srgn_idx = 0;
+		rgn_idx++;
+	}
+
+	cnt -= set_bit_len;
+	if (cnt > 0)
+		goto next_srgn;
+}
+
+static bool ufshpb_test_ppn_dirty(struct ufshpb_lu *hpb, int rgn_idx,
+				  int srgn_idx, int srgn_offset, int cnt)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+	int bitmap_len;
+	int bit_len;
+
+next_srgn:
+	rgn = hpb->rgn_tbl + rgn_idx;
+	srgn = rgn->srgn_tbl + srgn_idx;
+
+	if (likely(!srgn->is_last))
+		bitmap_len = hpb->entries_per_srgn;
+	else
+		bitmap_len = hpb->last_srgn_entries;
+
+	if (!ufshpb_is_valid_srgn(rgn, srgn))
+		return true;
+
+	/*
+	 * If the region state is active, mctx must be allocated.
+	 * In this case, check whether the region is evicted or
+	 * mctx allocation fail.
+	 */
+	if (unlikely(!srgn->mctx)) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"no mctx in region %d subregion %d.\n",
+			srgn->rgn_idx, srgn->srgn_idx);
+		return true;
+	}
+
+	if ((srgn_offset + cnt) > bitmap_len)
+		bit_len = bitmap_len - srgn_offset;
+	else
+		bit_len = cnt;
+
+	if (find_next_bit(srgn->mctx->ppn_dirty, bit_len + srgn_offset,
+			  srgn_offset) < bit_len + srgn_offset)
+		return true;
+
+	srgn_offset = 0;
+	if (++srgn_idx == hpb->srgns_per_rgn) {
+		srgn_idx = 0;
+		rgn_idx++;
+	}
+
+	cnt -= bit_len;
+	if (cnt > 0)
+		goto next_srgn;
+
+	return false;
+}
+
+static inline bool is_rgn_dirty(struct ufshpb_region *rgn)
+{
+	return test_bit(RGN_FLAG_DIRTY, &rgn->rgn_flags);
+}
+
+static int ufshpb_fill_ppn_from_page(struct ufshpb_lu *hpb,
+				     struct ufshpb_map_ctx *mctx, int pos,
+				     int len, __be64 *ppn_buf)
+{
+	struct page *page;
+	int index, offset;
+	int copied;
+
+	index = pos / (PAGE_SIZE / HPB_ENTRY_SIZE);
+	offset = pos % (PAGE_SIZE / HPB_ENTRY_SIZE);
+
+	if ((offset + len) <= (PAGE_SIZE / HPB_ENTRY_SIZE))
+		copied = len;
+	else
+		copied = (PAGE_SIZE / HPB_ENTRY_SIZE) - offset;
+
+	page = mctx->m_page[index];
+	if (unlikely(!page)) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"error. cannot find page in mctx\n");
+		return -ENOMEM;
+	}
+
+	memcpy(ppn_buf, page_address(page) + (offset * HPB_ENTRY_SIZE),
+	       copied * HPB_ENTRY_SIZE);
+
+	return copied;
+}
+
+static void
+ufshpb_get_pos_from_lpn(struct ufshpb_lu *hpb, unsigned long lpn, int *rgn_idx,
+			int *srgn_idx, int *offset)
+{
+	int rgn_offset;
+
+	*rgn_idx = lpn >> hpb->entries_per_rgn_shift;
+	rgn_offset = lpn & hpb->entries_per_rgn_mask;
+	*srgn_idx = rgn_offset >> hpb->entries_per_srgn_shift;
+	*offset = rgn_offset & hpb->entries_per_srgn_mask;
+}
+
+static void
+ufshpb_set_hpb_read_to_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
+			    __be64 ppn, u8 transfer_len)
+{
+	unsigned char *cdb = lrbp->cmd->cmnd;
+	__be64 ppn_tmp = ppn;
+	cdb[0] = UFSHPB_READ;
+
+	if (hba->dev_quirks & UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ)
+		ppn_tmp = (__force __be64)swab64((__force u64)ppn);
+
+	/* ppn value is stored as big-endian in the host memory */
+	memcpy(&cdb[6], &ppn_tmp, sizeof(__be64));
+	cdb[14] = transfer_len;
+	cdb[15] = 0;
+
+	lrbp->cmd->cmd_len = UFS_CDB_SIZE;
+}
+
+/*
+ * This function will set up HPB read command using host-side L2P map data.
+ */
+int ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufshpb_lu *hpb;
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+	struct scsi_cmnd *cmd = lrbp->cmd;
+	u32 lpn;
+	__be64 ppn;
+	unsigned long flags;
+	int transfer_len, rgn_idx, srgn_idx, srgn_offset;
+	int err = 0;
+
+	hpb = ufshpb_get_hpb_data(cmd->device);
+	if (!hpb)
+		return -ENODEV;
+
+	if (ufshpb_get_state(hpb) == HPB_INIT)
+		return -ENODEV;
+
+	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
+		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
+			   "%s: ufshpb state is not PRESENT", __func__);
+		return -ENODEV;
+	}
+
+	if (blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)) ||
+	    (!ufshpb_is_write_or_discard(cmd) &&
+	     !ufshpb_is_read_cmd(cmd)))
+		return 0;
+
+	transfer_len = sectors_to_logical(cmd->device,
+					  blk_rq_sectors(scsi_cmd_to_rq(cmd)));
+	if (unlikely(!transfer_len))
+		return 0;
+
+	lpn = sectors_to_logical(cmd->device, blk_rq_pos(scsi_cmd_to_rq(cmd)));
+	ufshpb_get_pos_from_lpn(hpb, lpn, &rgn_idx, &srgn_idx, &srgn_offset);
+	rgn = hpb->rgn_tbl + rgn_idx;
+	srgn = rgn->srgn_tbl + srgn_idx;
+
+	/* If command type is WRITE or DISCARD, set bitmap as drity */
+	if (ufshpb_is_write_or_discard(cmd)) {
+		ufshpb_iterate_rgn(hpb, rgn_idx, srgn_idx, srgn_offset,
+				   transfer_len, true);
+		return 0;
+	}
+
+	if (!ufshpb_is_supported_chunk(hpb, transfer_len))
+		return 0;
+
+	if (hpb->is_hcm) {
+		/*
+		 * in host control mode, reads are the main source for
+		 * activation trials.
+		 */
+		ufshpb_iterate_rgn(hpb, rgn_idx, srgn_idx, srgn_offset,
+				   transfer_len, false);
+
+		/* keep those counters normalized */
+		if (rgn->reads > hpb->entries_per_srgn)
+			schedule_work(&hpb->ufshpb_normalization_work);
+	}
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	if (ufshpb_test_ppn_dirty(hpb, rgn_idx, srgn_idx, srgn_offset,
+				   transfer_len)) {
+		hpb->stats.miss_cnt++;
+		spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+		return 0;
+	}
+
+	err = ufshpb_fill_ppn_from_page(hpb, srgn->mctx, srgn_offset, 1, &ppn);
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+	if (unlikely(err < 0)) {
+		/*
+		 * In this case, the region state is active,
+		 * but the ppn table is not allocated.
+		 * Make sure that ppn table must be allocated on
+		 * active state.
+		 */
+		dev_err(hba->dev, "get ppn failed. err %d\n", err);
+		return err;
+	}
+
+	ufshpb_set_hpb_read_to_upiu(hba, lrbp, ppn, transfer_len);
+
+	hpb->stats.hit_cnt++;
+	return 0;
+}
+
+static struct ufshpb_req *ufshpb_get_req(struct ufshpb_lu *hpb,
+					 int rgn_idx, enum req_opf dir,
+					 bool atomic)
+{
+	struct ufshpb_req *rq;
+	struct request *req;
+	int retries = HPB_MAP_REQ_RETRIES;
+
+	rq = kmem_cache_alloc(hpb->map_req_cache, GFP_KERNEL);
+	if (!rq)
+		return NULL;
+
+retry:
+	req = blk_mq_alloc_request(hpb->sdev_ufs_lu->request_queue, dir,
+			      BLK_MQ_REQ_NOWAIT);
+
+	if (!atomic && (PTR_ERR(req) == -EWOULDBLOCK) && (--retries > 0)) {
+		usleep_range(3000, 3100);
+		goto retry;
+	}
+
+	if (IS_ERR(req))
+		goto free_rq;
+
+	rq->hpb = hpb;
+	rq->req = req;
+	rq->rb.rgn_idx = rgn_idx;
+
+	return rq;
+
+free_rq:
+	kmem_cache_free(hpb->map_req_cache, rq);
+	return NULL;
+}
+
+static void ufshpb_put_req(struct ufshpb_lu *hpb, struct ufshpb_req *rq)
+{
+	blk_mq_free_request(rq->req);
+	kmem_cache_free(hpb->map_req_cache, rq);
+}
+
+static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
+					     struct ufshpb_subregion *srgn)
+{
+	struct ufshpb_req *map_req;
+	struct bio *bio;
+	unsigned long flags;
+
+	if (hpb->is_hcm &&
+	    hpb->num_inflight_map_req >= hpb->params.inflight_map_req) {
+		dev_info(&hpb->sdev_ufs_lu->sdev_dev,
+			 "map_req throttle. inflight %d throttle %d",
+			 hpb->num_inflight_map_req,
+			 hpb->params.inflight_map_req);
+		return NULL;
+	}
+
+	map_req = ufshpb_get_req(hpb, srgn->rgn_idx, REQ_OP_DRV_IN, false);
+	if (!map_req)
+		return NULL;
+
+	bio = bio_alloc(NULL, hpb->pages_per_srgn, 0, GFP_KERNEL);
+	if (!bio) {
+		ufshpb_put_req(hpb, map_req);
+		return NULL;
+	}
+
+	map_req->bio = bio;
+
+	map_req->rb.srgn_idx = srgn->srgn_idx;
+	map_req->rb.mctx = srgn->mctx;
+
+	spin_lock_irqsave(&hpb->param_lock, flags);
+	hpb->num_inflight_map_req++;
+	spin_unlock_irqrestore(&hpb->param_lock, flags);
+
+	return map_req;
+}
+
+static void ufshpb_put_map_req(struct ufshpb_lu *hpb,
+			       struct ufshpb_req *map_req)
+{
+	unsigned long flags;
+
+	bio_put(map_req->bio);
+	ufshpb_put_req(hpb, map_req);
+
+	spin_lock_irqsave(&hpb->param_lock, flags);
+	hpb->num_inflight_map_req--;
+	spin_unlock_irqrestore(&hpb->param_lock, flags);
+}
+
+static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,
+				     struct ufshpb_subregion *srgn)
+{
+	struct ufshpb_region *rgn;
+	u32 num_entries = hpb->entries_per_srgn;
+
+	if (!srgn->mctx) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"no mctx in region %d subregion %d.\n",
+			srgn->rgn_idx, srgn->srgn_idx);
+		return -1;
+	}
+
+	if (unlikely(srgn->is_last))
+		num_entries = hpb->last_srgn_entries;
+
+	bitmap_zero(srgn->mctx->ppn_dirty, num_entries);
+
+	rgn = hpb->rgn_tbl + srgn->rgn_idx;
+	clear_bit(RGN_FLAG_DIRTY, &rgn->rgn_flags);
+
+	return 0;
+}
+
+static void ufshpb_update_active_info(struct ufshpb_lu *hpb, int rgn_idx,
+				      int srgn_idx)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+
+	rgn = hpb->rgn_tbl + rgn_idx;
+	srgn = rgn->srgn_tbl + srgn_idx;
+
+	list_del_init(&rgn->list_inact_rgn);
+
+	if (list_empty(&srgn->list_act_srgn))
+		list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+
+	hpb->stats.rcmd_active_cnt++;
+}
+
+static void ufshpb_update_inactive_info(struct ufshpb_lu *hpb, int rgn_idx)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+	int srgn_idx;
+
+	rgn = hpb->rgn_tbl + rgn_idx;
+
+	for_each_sub_region(rgn, srgn_idx, srgn)
+		list_del_init(&srgn->list_act_srgn);
+
+	if (list_empty(&rgn->list_inact_rgn))
+		list_add_tail(&rgn->list_inact_rgn, &hpb->lh_inact_rgn);
+
+	hpb->stats.rcmd_inactive_cnt++;
+}
+
+static void ufshpb_activate_subregion(struct ufshpb_lu *hpb,
+				      struct ufshpb_subregion *srgn)
+{
+	struct ufshpb_region *rgn;
+
+	/*
+	 * If there is no mctx in subregion
+	 * after I/O progress for HPB_READ_BUFFER, the region to which the
+	 * subregion belongs was evicted.
+	 * Make sure the region must not evict in I/O progress
+	 */
+	if (!srgn->mctx) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"no mctx in region %d subregion %d.\n",
+			srgn->rgn_idx, srgn->srgn_idx);
+		srgn->srgn_state = HPB_SRGN_INVALID;
+		return;
+	}
+
+	rgn = hpb->rgn_tbl + srgn->rgn_idx;
+
+	if (unlikely(rgn->rgn_state == HPB_RGN_INACTIVE)) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"region %d subregion %d evicted\n",
+			srgn->rgn_idx, srgn->srgn_idx);
+		srgn->srgn_state = HPB_SRGN_INVALID;
+		return;
+	}
+	srgn->srgn_state = HPB_SRGN_VALID;
+}
+
+static void ufshpb_umap_req_compl_fn(struct request *req, blk_status_t error)
+{
+	struct ufshpb_req *umap_req = (struct ufshpb_req *)req->end_io_data;
+
+	ufshpb_put_req(umap_req->hpb, umap_req);
+}
+
+static void ufshpb_map_req_compl_fn(struct request *req, blk_status_t error)
+{
+	struct ufshpb_req *map_req = (struct ufshpb_req *) req->end_io_data;
+	struct ufshpb_lu *hpb = map_req->hpb;
+	struct ufshpb_subregion *srgn;
+	unsigned long flags;
+
+	srgn = hpb->rgn_tbl[map_req->rb.rgn_idx].srgn_tbl +
+		map_req->rb.srgn_idx;
+
+	ufshpb_clear_dirty_bitmap(hpb, srgn);
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	ufshpb_activate_subregion(hpb, srgn);
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+
+	ufshpb_put_map_req(map_req->hpb, map_req);
+}
+
+static void ufshpb_set_unmap_cmd(unsigned char *cdb, struct ufshpb_region *rgn)
+{
+	cdb[0] = UFSHPB_WRITE_BUFFER;
+	cdb[1] = rgn ? UFSHPB_WRITE_BUFFER_INACT_SINGLE_ID :
+			  UFSHPB_WRITE_BUFFER_INACT_ALL_ID;
+	if (rgn)
+		put_unaligned_be16(rgn->rgn_idx, &cdb[2]);
+	cdb[9] = 0x00;
+}
+
+static void ufshpb_set_read_buf_cmd(unsigned char *cdb, int rgn_idx,
+				    int srgn_idx, int srgn_mem_size)
+{
+	cdb[0] = UFSHPB_READ_BUFFER;
+	cdb[1] = UFSHPB_READ_BUFFER_ID;
+
+	put_unaligned_be16(rgn_idx, &cdb[2]);
+	put_unaligned_be16(srgn_idx, &cdb[4]);
+	put_unaligned_be24(srgn_mem_size, &cdb[6]);
+
+	cdb[9] = 0x00;
+}
+
+static void ufshpb_execute_umap_req(struct ufshpb_lu *hpb,
+				   struct ufshpb_req *umap_req,
+				   struct ufshpb_region *rgn)
+{
+	struct request *req = umap_req->req;
+	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
+
+	req->timeout = 0;
+	req->end_io_data = umap_req;
+
+	ufshpb_set_unmap_cmd(scmd->cmnd, rgn);
+	scmd->cmd_len = HPB_WRITE_BUFFER_CMD_LENGTH;
+
+	blk_execute_rq_nowait(req, true, ufshpb_umap_req_compl_fn);
+
+	hpb->stats.umap_req_cnt++;
+}
+
+static int ufshpb_execute_map_req(struct ufshpb_lu *hpb,
+				  struct ufshpb_req *map_req, bool last)
+{
+	struct request_queue *q;
+	struct request *req;
+	struct scsi_cmnd *scmd;
+	int mem_size = hpb->srgn_mem_size;
+	int ret = 0;
+	int i;
+
+	q = hpb->sdev_ufs_lu->request_queue;
+	for (i = 0; i < hpb->pages_per_srgn; i++) {
+		ret = bio_add_pc_page(q, map_req->bio, map_req->rb.mctx->m_page[i],
+				      PAGE_SIZE, 0);
+		if (ret != PAGE_SIZE) {
+			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+				   "bio_add_pc_page fail %d - %d\n",
+				   map_req->rb.rgn_idx, map_req->rb.srgn_idx);
+			return ret;
+		}
+	}
+
+	req = map_req->req;
+
+	blk_rq_append_bio(req, map_req->bio);
+
+	req->end_io_data = map_req;
+
+	if (unlikely(last))
+		mem_size = hpb->last_srgn_entries * HPB_ENTRY_SIZE;
+
+	scmd = blk_mq_rq_to_pdu(req);
+	ufshpb_set_read_buf_cmd(scmd->cmnd, map_req->rb.rgn_idx,
+				map_req->rb.srgn_idx, mem_size);
+	scmd->cmd_len = HPB_READ_BUFFER_CMD_LENGTH;
+
+	blk_execute_rq_nowait(req, true, ufshpb_map_req_compl_fn);
+
+	hpb->stats.map_req_cnt++;
+	return 0;
+}
+
+static struct ufshpb_map_ctx *ufshpb_get_map_ctx(struct ufshpb_lu *hpb,
+						 bool last)
+{
+	struct ufshpb_map_ctx *mctx;
+	u32 num_entries = hpb->entries_per_srgn;
+	int i, j;
+
+	mctx = mempool_alloc(ufshpb_mctx_pool, GFP_KERNEL);
+	if (!mctx)
+		return NULL;
+
+	mctx->m_page = kmem_cache_alloc(hpb->m_page_cache, GFP_KERNEL);
+	if (!mctx->m_page)
+		goto release_mctx;
+
+	if (unlikely(last))
+		num_entries = hpb->last_srgn_entries;
+
+	mctx->ppn_dirty = bitmap_zalloc(num_entries, GFP_KERNEL);
+	if (!mctx->ppn_dirty)
+		goto release_m_page;
+
+	for (i = 0; i < hpb->pages_per_srgn; i++) {
+		mctx->m_page[i] = mempool_alloc(ufshpb_page_pool, GFP_KERNEL);
+		if (!mctx->m_page[i]) {
+			for (j = 0; j < i; j++)
+				mempool_free(mctx->m_page[j], ufshpb_page_pool);
+			goto release_ppn_dirty;
+		}
+		clear_page(page_address(mctx->m_page[i]));
+	}
+
+	return mctx;
+
+release_ppn_dirty:
+	bitmap_free(mctx->ppn_dirty);
+release_m_page:
+	kmem_cache_free(hpb->m_page_cache, mctx->m_page);
+release_mctx:
+	mempool_free(mctx, ufshpb_mctx_pool);
+	return NULL;
+}
+
+static void ufshpb_put_map_ctx(struct ufshpb_lu *hpb,
+			       struct ufshpb_map_ctx *mctx)
+{
+	int i;
+
+	for (i = 0; i < hpb->pages_per_srgn; i++)
+		mempool_free(mctx->m_page[i], ufshpb_page_pool);
+
+	bitmap_free(mctx->ppn_dirty);
+	kmem_cache_free(hpb->m_page_cache, mctx->m_page);
+	mempool_free(mctx, ufshpb_mctx_pool);
+}
+
+static int ufshpb_check_srgns_issue_state(struct ufshpb_lu *hpb,
+					  struct ufshpb_region *rgn)
+{
+	struct ufshpb_subregion *srgn;
+	int srgn_idx;
+
+	for_each_sub_region(rgn, srgn_idx, srgn)
+		if (srgn->srgn_state == HPB_SRGN_ISSUED)
+			return -EPERM;
+
+	return 0;
+}
+
+static void ufshpb_read_to_handler(struct work_struct *work)
+{
+	struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu,
+					     ufshpb_read_to_work.work);
+	struct victim_select_info *lru_info = &hpb->lru_info;
+	struct ufshpb_region *rgn, *next_rgn;
+	unsigned long flags;
+	unsigned int poll;
+	LIST_HEAD(expired_list);
+
+	if (test_and_set_bit(TIMEOUT_WORK_RUNNING, &hpb->work_data_bits))
+		return;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+
+	list_for_each_entry_safe(rgn, next_rgn, &lru_info->lh_lru_rgn,
+				 list_lru_rgn) {
+		bool timedout = ktime_after(ktime_get(), rgn->read_timeout);
+
+		if (timedout) {
+			rgn->read_timeout_expiries--;
+			if (is_rgn_dirty(rgn) ||
+			    rgn->read_timeout_expiries == 0)
+				list_add(&rgn->list_expired_rgn, &expired_list);
+			else
+				rgn->read_timeout = ktime_add_ms(ktime_get(),
+						hpb->params.read_timeout_ms);
+		}
+	}
+
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+
+	list_for_each_entry_safe(rgn, next_rgn, &expired_list,
+				 list_expired_rgn) {
+		list_del_init(&rgn->list_expired_rgn);
+		spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+		ufshpb_update_inactive_info(hpb, rgn->rgn_idx);
+		spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+	}
+
+	ufshpb_kick_map_work(hpb);
+
+	clear_bit(TIMEOUT_WORK_RUNNING, &hpb->work_data_bits);
+
+	poll = hpb->params.timeout_polling_interval_ms;
+	schedule_delayed_work(&hpb->ufshpb_read_to_work,
+			      msecs_to_jiffies(poll));
+}
+
+static void ufshpb_add_lru_info(struct victim_select_info *lru_info,
+				struct ufshpb_region *rgn)
+{
+	rgn->rgn_state = HPB_RGN_ACTIVE;
+	list_add_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
+	atomic_inc(&lru_info->active_cnt);
+	if (rgn->hpb->is_hcm) {
+		rgn->read_timeout =
+			ktime_add_ms(ktime_get(),
+				     rgn->hpb->params.read_timeout_ms);
+		rgn->read_timeout_expiries =
+			rgn->hpb->params.read_timeout_expiries;
+	}
+}
+
+static void ufshpb_hit_lru_info(struct victim_select_info *lru_info,
+				struct ufshpb_region *rgn)
+{
+	list_move_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
+}
+
+static struct ufshpb_region *ufshpb_victim_lru_info(struct ufshpb_lu *hpb)
+{
+	struct victim_select_info *lru_info = &hpb->lru_info;
+	struct ufshpb_region *rgn, *victim_rgn = NULL;
+
+	list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn) {
+		if (ufshpb_check_srgns_issue_state(hpb, rgn))
+			continue;
+
+		/*
+		 * in host control mode, verify that the exiting region
+		 * has fewer reads
+		 */
+		if (hpb->is_hcm &&
+		    rgn->reads > hpb->params.eviction_thld_exit)
+			continue;
+
+		victim_rgn = rgn;
+		break;
+	}
+
+	if (!victim_rgn)
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			"%s: no region allocated\n",
+			__func__);
+
+	return victim_rgn;
+}
+
+static void ufshpb_cleanup_lru_info(struct victim_select_info *lru_info,
+				    struct ufshpb_region *rgn)
+{
+	list_del_init(&rgn->list_lru_rgn);
+	rgn->rgn_state = HPB_RGN_INACTIVE;
+	atomic_dec(&lru_info->active_cnt);
+}
+
+static void ufshpb_purge_active_subregion(struct ufshpb_lu *hpb,
+					  struct ufshpb_subregion *srgn)
+{
+	if (srgn->srgn_state != HPB_SRGN_UNUSED) {
+		ufshpb_put_map_ctx(hpb, srgn->mctx);
+		srgn->srgn_state = HPB_SRGN_UNUSED;
+		srgn->mctx = NULL;
+	}
+}
+
+static int ufshpb_issue_umap_req(struct ufshpb_lu *hpb,
+				 struct ufshpb_region *rgn,
+				 bool atomic)
+{
+	struct ufshpb_req *umap_req;
+	int rgn_idx = rgn ? rgn->rgn_idx : 0;
+
+	umap_req = ufshpb_get_req(hpb, rgn_idx, REQ_OP_DRV_OUT, atomic);
+	if (!umap_req)
+		return -ENOMEM;
+
+	ufshpb_execute_umap_req(hpb, umap_req, rgn);
+
+	return 0;
+}
+
+static int ufshpb_issue_umap_single_req(struct ufshpb_lu *hpb,
+					struct ufshpb_region *rgn)
+{
+	return ufshpb_issue_umap_req(hpb, rgn, true);
+}
+
+static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
+				 struct ufshpb_region *rgn)
+{
+	struct victim_select_info *lru_info;
+	struct ufshpb_subregion *srgn;
+	int srgn_idx;
+
+	lru_info = &hpb->lru_info;
+
+	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n", rgn->rgn_idx);
+
+	ufshpb_cleanup_lru_info(lru_info, rgn);
+
+	for_each_sub_region(rgn, srgn_idx, srgn)
+		ufshpb_purge_active_subregion(hpb, srgn);
+}
+
+static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	if (rgn->rgn_state == HPB_RGN_PINNED) {
+		dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
+			 "pinned region cannot drop-out. region %d\n",
+			 rgn->rgn_idx);
+		goto out;
+	}
+
+	if (!list_empty(&rgn->list_lru_rgn)) {
+		if (ufshpb_check_srgns_issue_state(hpb, rgn)) {
+			ret = -EBUSY;
+			goto out;
+		}
+
+		if (hpb->is_hcm) {
+			spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+			ret = ufshpb_issue_umap_single_req(hpb, rgn);
+			spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+			if (ret)
+				goto out;
+		}
+
+		__ufshpb_evict_region(hpb, rgn);
+	}
+out:
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+	return ret;
+}
+
+static int ufshpb_issue_map_req(struct ufshpb_lu *hpb,
+				struct ufshpb_region *rgn,
+				struct ufshpb_subregion *srgn)
+{
+	struct ufshpb_req *map_req;
+	unsigned long flags;
+	int ret;
+	int err = -EAGAIN;
+	bool alloc_required = false;
+	enum HPB_SRGN_STATE state = HPB_SRGN_INVALID;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+
+	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
+		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
+			   "%s: ufshpb state is not PRESENT\n", __func__);
+		goto unlock_out;
+	}
+
+	if ((rgn->rgn_state == HPB_RGN_INACTIVE) &&
+	    (srgn->srgn_state == HPB_SRGN_INVALID)) {
+		err = 0;
+		goto unlock_out;
+	}
+
+	if (srgn->srgn_state == HPB_SRGN_UNUSED)
+		alloc_required = true;
+
+	/*
+	 * If the subregion is already ISSUED state,
+	 * a specific event (e.g., GC or wear-leveling, etc.) occurs in
+	 * the device and HPB response for map loading is received.
+	 * In this case, after finishing the HPB_READ_BUFFER,
+	 * the next HPB_READ_BUFFER is performed again to obtain the latest
+	 * map data.
+	 */
+	if (srgn->srgn_state == HPB_SRGN_ISSUED)
+		goto unlock_out;
+
+	srgn->srgn_state = HPB_SRGN_ISSUED;
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+
+	if (alloc_required) {
+		srgn->mctx = ufshpb_get_map_ctx(hpb, srgn->is_last);
+		if (!srgn->mctx) {
+			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			    "get map_ctx failed. region %d - %d\n",
+			    rgn->rgn_idx, srgn->srgn_idx);
+			state = HPB_SRGN_UNUSED;
+			goto change_srgn_state;
+		}
+	}
+
+	map_req = ufshpb_get_map_req(hpb, srgn);
+	if (!map_req)
+		goto change_srgn_state;
+
+
+	ret = ufshpb_execute_map_req(hpb, map_req, srgn->is_last);
+	if (ret) {
+		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			   "%s: issue map_req failed: %d, region %d - %d\n",
+			   __func__, ret, srgn->rgn_idx, srgn->srgn_idx);
+		goto free_map_req;
+	}
+	return 0;
+
+free_map_req:
+	ufshpb_put_map_req(hpb, map_req);
+change_srgn_state:
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	srgn->srgn_state = state;
+unlock_out:
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+	return err;
+}
+
+static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
+{
+	struct ufshpb_region *victim_rgn = NULL;
+	struct victim_select_info *lru_info = &hpb->lru_info;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+	/*
+	 * If region belongs to lru_list, just move the region
+	 * to the front of lru list because the state of the region
+	 * is already active-state.
+	 */
+	if (!list_empty(&rgn->list_lru_rgn)) {
+		ufshpb_hit_lru_info(lru_info, rgn);
+		goto out;
+	}
+
+	if (rgn->rgn_state == HPB_RGN_INACTIVE) {
+		if (atomic_read(&lru_info->active_cnt) ==
+		    lru_info->max_lru_active_cnt) {
+			/*
+			 * If the maximum number of active regions
+			 * is exceeded, evict the least recently used region.
+			 * This case may occur when the device responds
+			 * to the eviction information late.
+			 * It is okay to evict the least recently used region,
+			 * because the device could detect this region
+			 * by not issuing HPB_READ
+			 *
+			 * in host control mode, verify that the entering
+			 * region has enough reads
+			 */
+			if (hpb->is_hcm &&
+			    rgn->reads < hpb->params.eviction_thld_enter) {
+				ret = -EACCES;
+				goto out;
+			}
+
+			victim_rgn = ufshpb_victim_lru_info(hpb);
+			if (!victim_rgn) {
+				dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
+				    "cannot get victim region %s\n",
+				    hpb->is_hcm ? "" : "error");
+				ret = -ENOMEM;
+				goto out;
+			}
+
+			dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
+				"LRU full (%d), choose victim %d\n",
+				atomic_read(&lru_info->active_cnt),
+				victim_rgn->rgn_idx);
+
+			if (hpb->is_hcm) {
+				spin_unlock_irqrestore(&hpb->rgn_state_lock,
+						       flags);
+				ret = ufshpb_issue_umap_single_req(hpb,
+								victim_rgn);
+				spin_lock_irqsave(&hpb->rgn_state_lock,
+						  flags);
+				if (ret)
+					goto out;
+			}
+
+			__ufshpb_evict_region(hpb, victim_rgn);
+		}
+
+		/*
+		 * When a region is added to lru_info list_head,
+		 * it is guaranteed that the subregion has been
+		 * assigned all mctx. If failed, try to receive mctx again
+		 * without being added to lru_info list_head
+		 */
+		ufshpb_add_lru_info(lru_info, rgn);
+	}
+out:
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+	return ret;
+}
+/**
+ *ufshpb_submit_region_inactive() - submit a region to be inactivated later
+ *@hpb: per-LU HPB instance
+ *@region_index: the index associated with the region that will be inactivated later
+ */
+static void ufshpb_submit_region_inactive(struct ufshpb_lu *hpb, int region_index)
+{
+	int subregion_index;
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+
+	/*
+	 * Remove this region from active region list and add it to inactive list
+	 */
+	spin_lock(&hpb->rsp_list_lock);
+	ufshpb_update_inactive_info(hpb, region_index);
+	spin_unlock(&hpb->rsp_list_lock);
+
+	rgn = hpb->rgn_tbl + region_index;
+
+	/*
+	 * Set subregion state to be HPB_SRGN_INVALID, there will no HPB read on this subregion
+	 */
+	spin_lock(&hpb->rgn_state_lock);
+	if (rgn->rgn_state != HPB_RGN_INACTIVE) {
+		for (subregion_index = 0; subregion_index < rgn->srgn_cnt; subregion_index++) {
+			srgn = rgn->srgn_tbl + subregion_index;
+			if (srgn->srgn_state == HPB_SRGN_VALID)
+				srgn->srgn_state = HPB_SRGN_INVALID;
+		}
+	}
+	spin_unlock(&hpb->rgn_state_lock);
+}
+
+static void ufshpb_rsp_req_region_update(struct ufshpb_lu *hpb,
+					 struct utp_hpb_rsp *rsp_field)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+	int i, rgn_i, srgn_i;
+
+	BUILD_BUG_ON(sizeof(struct ufshpb_active_field) != HPB_ACT_FIELD_SIZE);
+	/*
+	 * If the active region and the inactive region are the same,
+	 * we will inactivate this region.
+	 * The device could check this (region inactivated) and
+	 * will response the proper active region information
+	 */
+	for (i = 0; i < rsp_field->active_rgn_cnt; i++) {
+		rgn_i =
+			be16_to_cpu(rsp_field->hpb_active_field[i].active_rgn);
+		srgn_i =
+			be16_to_cpu(rsp_field->hpb_active_field[i].active_srgn);
+
+		rgn = hpb->rgn_tbl + rgn_i;
+		if (hpb->is_hcm &&
+		    (rgn->rgn_state != HPB_RGN_ACTIVE || is_rgn_dirty(rgn))) {
+			/*
+			 * in host control mode, subregion activation
+			 * recommendations are only allowed to active regions.
+			 * Also, ignore recommendations for dirty regions - the
+			 * host will make decisions concerning those by himself
+			 */
+			continue;
+		}
+
+		dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
+			"activate(%d) region %d - %d\n", i, rgn_i, srgn_i);
+
+		spin_lock(&hpb->rsp_list_lock);
+		ufshpb_update_active_info(hpb, rgn_i, srgn_i);
+		spin_unlock(&hpb->rsp_list_lock);
+
+		srgn = rgn->srgn_tbl + srgn_i;
+
+		/* blocking HPB_READ */
+		spin_lock(&hpb->rgn_state_lock);
+		if (srgn->srgn_state == HPB_SRGN_VALID)
+			srgn->srgn_state = HPB_SRGN_INVALID;
+		spin_unlock(&hpb->rgn_state_lock);
+	}
+
+	if (hpb->is_hcm) {
+		/*
+		 * in host control mode the device is not allowed to inactivate
+		 * regions
+		 */
+		goto out;
+	}
+
+	for (i = 0; i < rsp_field->inactive_rgn_cnt; i++) {
+		rgn_i = be16_to_cpu(rsp_field->hpb_inactive_field[i]);
+		dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "inactivate(%d) region %d\n", i, rgn_i);
+		ufshpb_submit_region_inactive(hpb, rgn_i);
+	}
+
+out:
+	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "Noti: #ACT %u #INACT %u\n",
+		rsp_field->active_rgn_cnt, rsp_field->inactive_rgn_cnt);
+
+	if (ufshpb_get_state(hpb) == HPB_PRESENT)
+		queue_work(ufshpb_wq, &hpb->map_work);
+}
+
+/*
+ * Set the flags of all active regions to RGN_FLAG_UPDATE to let host side reload L2P entries later
+ */
+static void ufshpb_set_regions_update(struct ufshpb_lu *hpb)
+{
+	struct victim_select_info *lru_info = &hpb->lru_info;
+	struct ufshpb_region *rgn;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+
+	list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn)
+		set_bit(RGN_FLAG_UPDATE, &rgn->rgn_flags);
+
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+}
+
+static void ufshpb_dev_reset_handler(struct ufs_hba *hba)
+{
+	struct scsi_device *sdev;
+	struct ufshpb_lu *hpb;
+
+	__shost_for_each_device(sdev, hba->host) {
+		hpb = ufshpb_get_hpb_data(sdev);
+		if (!hpb)
+			continue;
+
+		if (hpb->is_hcm) {
+			/*
+			 * For the HPB host control mode, in case device powered up and lost HPB
+			 * information, we will set the region flag to be RGN_FLAG_UPDATE, it will
+			 * let host reload its L2P entries(reactivate region in the UFS device).
+			 */
+			ufshpb_set_regions_update(hpb);
+		} else {
+			/*
+			 * For the HPB device control mode, if host side receives 02h:HPB Operation
+			 * in UPIU response, which means device recommends the host side should
+			 * inactivate all active regions. Here we add all active regions to inactive
+			 * list, they will be inactivated later in ufshpb_map_work_handler().
+			 */
+			struct victim_select_info *lru_info = &hpb->lru_info;
+			struct ufshpb_region *rgn;
+
+			list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn)
+				ufshpb_submit_region_inactive(hpb, rgn->rgn_idx);
+
+			if (ufshpb_get_state(hpb) == HPB_PRESENT)
+				queue_work(ufshpb_wq, &hpb->map_work);
+		}
+	}
+}
+
+/*
+ * This function will parse recommended active subregion information in sense
+ * data field of response UPIU with SAM_STAT_GOOD state.
+ */
+void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(lrbp->cmd->device);
+	struct utp_hpb_rsp *rsp_field = &lrbp->ucd_rsp_ptr->hr;
+	int data_seg_len;
+
+	if (unlikely(lrbp->lun != rsp_field->lun)) {
+		struct scsi_device *sdev;
+		bool found = false;
+
+		__shost_for_each_device(sdev, hba->host) {
+			hpb = ufshpb_get_hpb_data(sdev);
+
+			if (!hpb)
+				continue;
+
+			if (rsp_field->lun == hpb->lun) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+			return;
+	}
+
+	if (!hpb)
+		return;
+
+	if (ufshpb_get_state(hpb) == HPB_INIT)
+		return;
+
+	if ((ufshpb_get_state(hpb) != HPB_PRESENT) &&
+	    (ufshpb_get_state(hpb) != HPB_SUSPEND)) {
+		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
+			   "%s: ufshpb state is not PRESENT/SUSPEND\n",
+			   __func__);
+		return;
+	}
+
+	data_seg_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2)
+		& MASK_RSP_UPIU_DATA_SEG_LEN;
+
+	/* To flush remained rsp_list, we queue the map_work task */
+	if (!data_seg_len) {
+		if (!ufshpb_is_general_lun(hpb->lun))
+			return;
+
+		ufshpb_kick_map_work(hpb);
+		return;
+	}
+
+	BUILD_BUG_ON(sizeof(struct utp_hpb_rsp) != UTP_HPB_RSP_SIZE);
+
+	if (!ufshpb_is_hpb_rsp_valid(hba, lrbp, rsp_field))
+		return;
+
+	hpb->stats.rcmd_noti_cnt++;
+
+	switch (rsp_field->hpb_op) {
+	case HPB_RSP_REQ_REGION_UPDATE:
+		if (data_seg_len != DEV_DATA_SEG_LEN)
+			dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
+				 "%s: data seg length is not same.\n",
+				 __func__);
+		ufshpb_rsp_req_region_update(hpb, rsp_field);
+		break;
+	case HPB_RSP_DEV_RESET:
+		dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
+			 "UFS device lost HPB information during PM.\n");
+		ufshpb_dev_reset_handler(hba);
+
+		break;
+	default:
+		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
+			   "hpb_op is not available: %d\n",
+			   rsp_field->hpb_op);
+		break;
+	}
+}
+
+static void ufshpb_add_active_list(struct ufshpb_lu *hpb,
+				   struct ufshpb_region *rgn,
+				   struct ufshpb_subregion *srgn)
+{
+	if (!list_empty(&rgn->list_inact_rgn))
+		return;
+
+	if (!list_empty(&srgn->list_act_srgn)) {
+		list_move(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+		return;
+	}
+
+	list_add(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+}
+
+static void ufshpb_add_pending_evict_list(struct ufshpb_lu *hpb,
+					  struct ufshpb_region *rgn,
+					  struct list_head *pending_list)
+{
+	struct ufshpb_subregion *srgn;
+	int srgn_idx;
+
+	if (!list_empty(&rgn->list_inact_rgn))
+		return;
+
+	for_each_sub_region(rgn, srgn_idx, srgn)
+		if (!list_empty(&srgn->list_act_srgn))
+			return;
+
+	list_add_tail(&rgn->list_inact_rgn, pending_list);
+}
+
+static void ufshpb_run_active_subregion_list(struct ufshpb_lu *hpb)
+{
+	struct ufshpb_region *rgn;
+	struct ufshpb_subregion *srgn;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	while ((srgn = list_first_entry_or_null(&hpb->lh_act_srgn,
+						struct ufshpb_subregion,
+						list_act_srgn))) {
+		if (ufshpb_get_state(hpb) == HPB_SUSPEND)
+			break;
+
+		list_del_init(&srgn->list_act_srgn);
+		spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+		rgn = hpb->rgn_tbl + srgn->rgn_idx;
+		ret = ufshpb_add_region(hpb, rgn);
+		if (ret)
+			goto active_failed;
+
+		ret = ufshpb_issue_map_req(hpb, rgn, srgn);
+		if (ret) {
+			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
+			    "issue map_req failed. ret %d, region %d - %d\n",
+			    ret, rgn->rgn_idx, srgn->srgn_idx);
+			goto active_failed;
+		}
+		spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	}
+	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+	return;
+
+active_failed:
+	dev_err(&hpb->sdev_ufs_lu->sdev_dev, "failed to activate region %d - %d, will retry\n",
+		   rgn->rgn_idx, srgn->srgn_idx);
+	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	ufshpb_add_active_list(hpb, rgn, srgn);
+	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static void ufshpb_run_inactive_region_list(struct ufshpb_lu *hpb)
+{
+	struct ufshpb_region *rgn;
+	unsigned long flags;
+	int ret;
+	LIST_HEAD(pending_list);
+
+	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	while ((rgn = list_first_entry_or_null(&hpb->lh_inact_rgn,
+					       struct ufshpb_region,
+					       list_inact_rgn))) {
+		if (ufshpb_get_state(hpb) == HPB_SUSPEND)
+			break;
+
+		list_del_init(&rgn->list_inact_rgn);
+		spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+		ret = ufshpb_evict_region(hpb, rgn);
+		if (ret) {
+			spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+			ufshpb_add_pending_evict_list(hpb, rgn, &pending_list);
+			spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+		}
+
+		spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	}
+
+	list_splice(&pending_list, &hpb->lh_inact_rgn);
+	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static void ufshpb_normalization_work_handler(struct work_struct *work)
+{
+	struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu,
+					     ufshpb_normalization_work);
+	int rgn_idx;
+	u8 factor = hpb->params.normalization_factor;
+
+	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
+		struct ufshpb_region *rgn = hpb->rgn_tbl + rgn_idx;
+		int srgn_idx;
+
+		spin_lock(&rgn->rgn_lock);
+		rgn->reads = 0;
+		for (srgn_idx = 0; srgn_idx < hpb->srgns_per_rgn; srgn_idx++) {
+			struct ufshpb_subregion *srgn = rgn->srgn_tbl + srgn_idx;
+
+			srgn->reads >>= factor;
+			rgn->reads += srgn->reads;
+		}
+		spin_unlock(&rgn->rgn_lock);
+
+		if (rgn->rgn_state != HPB_RGN_ACTIVE || rgn->reads)
+			continue;
+
+		/* if region is active but has no reads - inactivate it */
+		spin_lock(&hpb->rsp_list_lock);
+		ufshpb_update_inactive_info(hpb, rgn->rgn_idx);
+		spin_unlock(&hpb->rsp_list_lock);
+	}
+}
+
+static void ufshpb_map_work_handler(struct work_struct *work)
+{
+	struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu, map_work);
+
+	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
+		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
+			   "%s: ufshpb state is not PRESENT\n", __func__);
+		return;
+	}
+
+	ufshpb_run_inactive_region_list(hpb);
+	ufshpb_run_active_subregion_list(hpb);
+}
+
+/*
+ * this function doesn't need to hold lock due to be called in init.
+ * (rgn_state_lock, rsp_list_lock, etc..)
+ */
+static int ufshpb_init_pinned_active_region(struct ufs_hba *hba,
+					    struct ufshpb_lu *hpb,
+					    struct ufshpb_region *rgn)
+{
+	struct ufshpb_subregion *srgn;
+	int srgn_idx, i;
+	int err = 0;
+
+	for_each_sub_region(rgn, srgn_idx, srgn) {
+		srgn->mctx = ufshpb_get_map_ctx(hpb, srgn->is_last);
+		srgn->srgn_state = HPB_SRGN_INVALID;
+		if (!srgn->mctx) {
+			err = -ENOMEM;
+			dev_err(hba->dev,
+				"alloc mctx for pinned region failed\n");
+			goto release;
+		}
+
+		list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+	}
+
+	rgn->rgn_state = HPB_RGN_PINNED;
+	return 0;
+
+release:
+	for (i = 0; i < srgn_idx; i++) {
+		srgn = rgn->srgn_tbl + i;
+		ufshpb_put_map_ctx(hpb, srgn->mctx);
+	}
+	return err;
+}
+
+static void ufshpb_init_subregion_tbl(struct ufshpb_lu *hpb,
+				      struct ufshpb_region *rgn, bool last)
+{
+	int srgn_idx;
+	struct ufshpb_subregion *srgn;
+
+	for_each_sub_region(rgn, srgn_idx, srgn) {
+		INIT_LIST_HEAD(&srgn->list_act_srgn);
+
+		srgn->rgn_idx = rgn->rgn_idx;
+		srgn->srgn_idx = srgn_idx;
+		srgn->srgn_state = HPB_SRGN_UNUSED;
+	}
+
+	if (unlikely(last && hpb->last_srgn_entries))
+		srgn->is_last = true;
+}
+
+static int ufshpb_alloc_subregion_tbl(struct ufshpb_lu *hpb,
+				      struct ufshpb_region *rgn, int srgn_cnt)
+{
+	rgn->srgn_tbl = kvcalloc(srgn_cnt, sizeof(struct ufshpb_subregion),
+				 GFP_KERNEL);
+	if (!rgn->srgn_tbl)
+		return -ENOMEM;
+
+	rgn->srgn_cnt = srgn_cnt;
+	return 0;
+}
+
+static void ufshpb_lu_parameter_init(struct ufs_hba *hba,
+				     struct ufshpb_lu *hpb,
+				     struct ufshpb_dev_info *hpb_dev_info,
+				     struct ufshpb_lu_info *hpb_lu_info)
+{
+	u32 entries_per_rgn;
+	u64 rgn_mem_size, tmp;
+
+	if (ufshpb_is_legacy(hba))
+		hpb->pre_req_max_tr_len = HPB_LEGACY_CHUNK_HIGH;
+	else
+		hpb->pre_req_max_tr_len = hpb_dev_info->max_hpb_single_cmd;
+
+	hpb->lu_pinned_start = hpb_lu_info->pinned_start;
+	hpb->lu_pinned_end = hpb_lu_info->num_pinned ?
+		(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)
+		: PINNED_NOT_SET;
+	hpb->lru_info.max_lru_active_cnt =
+		hpb_lu_info->max_active_rgns - hpb_lu_info->num_pinned;
+
+	rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT
+			* HPB_ENTRY_SIZE;
+	do_div(rgn_mem_size, HPB_ENTRY_BLOCK_SIZE);
+	hpb->srgn_mem_size = (1ULL << hpb_dev_info->srgn_size)
+		* HPB_RGN_SIZE_UNIT / HPB_ENTRY_BLOCK_SIZE * HPB_ENTRY_SIZE;
+
+	tmp = rgn_mem_size;
+	do_div(tmp, HPB_ENTRY_SIZE);
+	entries_per_rgn = (u32)tmp;
+	hpb->entries_per_rgn_shift = ilog2(entries_per_rgn);
+	hpb->entries_per_rgn_mask = entries_per_rgn - 1;
+
+	hpb->entries_per_srgn = hpb->srgn_mem_size / HPB_ENTRY_SIZE;
+	hpb->entries_per_srgn_shift = ilog2(hpb->entries_per_srgn);
+	hpb->entries_per_srgn_mask = hpb->entries_per_srgn - 1;
+
+	tmp = rgn_mem_size;
+	do_div(tmp, hpb->srgn_mem_size);
+	hpb->srgns_per_rgn = (int)tmp;
+
+	hpb->rgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,
+				entries_per_rgn);
+	hpb->srgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,
+				(hpb->srgn_mem_size / HPB_ENTRY_SIZE));
+	hpb->last_srgn_entries = hpb_lu_info->num_blocks
+				 % (hpb->srgn_mem_size / HPB_ENTRY_SIZE);
+
+	hpb->pages_per_srgn = DIV_ROUND_UP(hpb->srgn_mem_size, PAGE_SIZE);
+
+	if (hpb_dev_info->control_mode == HPB_HOST_CONTROL)
+		hpb->is_hcm = true;
+}
+
+static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
+{
+	struct ufshpb_region *rgn_table, *rgn;
+	int rgn_idx, i;
+	int ret = 0;
+
+	rgn_table = kvcalloc(hpb->rgns_per_lu, sizeof(struct ufshpb_region),
+			    GFP_KERNEL);
+	if (!rgn_table)
+		return -ENOMEM;
+
+	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
+		int srgn_cnt = hpb->srgns_per_rgn;
+		bool last_srgn = false;
+
+		rgn = rgn_table + rgn_idx;
+		rgn->rgn_idx = rgn_idx;
+
+		spin_lock_init(&rgn->rgn_lock);
+
+		INIT_LIST_HEAD(&rgn->list_inact_rgn);
+		INIT_LIST_HEAD(&rgn->list_lru_rgn);
+		INIT_LIST_HEAD(&rgn->list_expired_rgn);
+
+		if (rgn_idx == hpb->rgns_per_lu - 1) {
+			srgn_cnt = ((hpb->srgns_per_lu - 1) %
+				    hpb->srgns_per_rgn) + 1;
+			last_srgn = true;
+		}
+
+		ret = ufshpb_alloc_subregion_tbl(hpb, rgn, srgn_cnt);
+		if (ret)
+			goto release_srgn_table;
+		ufshpb_init_subregion_tbl(hpb, rgn, last_srgn);
+
+		if (ufshpb_is_pinned_region(hpb, rgn_idx)) {
+			ret = ufshpb_init_pinned_active_region(hba, hpb, rgn);
+			if (ret)
+				goto release_srgn_table;
+		} else {
+			rgn->rgn_state = HPB_RGN_INACTIVE;
+		}
+
+		rgn->rgn_flags = 0;
+		rgn->hpb = hpb;
+	}
+
+	hpb->rgn_tbl = rgn_table;
+
+	return 0;
+
+release_srgn_table:
+	for (i = 0; i <= rgn_idx; i++)
+		kvfree(rgn_table[i].srgn_tbl);
+
+	kvfree(rgn_table);
+	return ret;
+}
+
+static void ufshpb_destroy_subregion_tbl(struct ufshpb_lu *hpb,
+					 struct ufshpb_region *rgn)
+{
+	int srgn_idx;
+	struct ufshpb_subregion *srgn;
+
+	for_each_sub_region(rgn, srgn_idx, srgn)
+		if (srgn->srgn_state != HPB_SRGN_UNUSED) {
+			srgn->srgn_state = HPB_SRGN_UNUSED;
+			ufshpb_put_map_ctx(hpb, srgn->mctx);
+		}
+}
+
+static void ufshpb_destroy_region_tbl(struct ufshpb_lu *hpb)
+{
+	int rgn_idx;
+
+	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
+		struct ufshpb_region *rgn;
+
+		rgn = hpb->rgn_tbl + rgn_idx;
+		if (rgn->rgn_state != HPB_RGN_INACTIVE) {
+			rgn->rgn_state = HPB_RGN_INACTIVE;
+
+			ufshpb_destroy_subregion_tbl(hpb, rgn);
+		}
+
+		kvfree(rgn->srgn_tbl);
+	}
+
+	kvfree(hpb->rgn_tbl);
+}
+
+/* SYSFS functions */
+#define ufshpb_sysfs_attr_show_func(__name)				\
+static ssize_t __name##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct scsi_device *sdev = to_scsi_device(dev);			\
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);		\
+									\
+	if (!hpb)							\
+		return -ENODEV;						\
+									\
+	return sysfs_emit(buf, "%llu\n", hpb->stats.__name);		\
+}									\
+\
+static DEVICE_ATTR_RO(__name)
+
+ufshpb_sysfs_attr_show_func(hit_cnt);
+ufshpb_sysfs_attr_show_func(miss_cnt);
+ufshpb_sysfs_attr_show_func(rcmd_noti_cnt);
+ufshpb_sysfs_attr_show_func(rcmd_active_cnt);
+ufshpb_sysfs_attr_show_func(rcmd_inactive_cnt);
+ufshpb_sysfs_attr_show_func(map_req_cnt);
+ufshpb_sysfs_attr_show_func(umap_req_cnt);
+
+static struct attribute *hpb_dev_stat_attrs[] = {
+	&dev_attr_hit_cnt.attr,
+	&dev_attr_miss_cnt.attr,
+	&dev_attr_rcmd_noti_cnt.attr,
+	&dev_attr_rcmd_active_cnt.attr,
+	&dev_attr_rcmd_inactive_cnt.attr,
+	&dev_attr_map_req_cnt.attr,
+	&dev_attr_umap_req_cnt.attr,
+	NULL,
+};
+
+struct attribute_group ufs_sysfs_hpb_stat_group = {
+	.name = "hpb_stats",
+	.attrs = hpb_dev_stat_attrs,
+};
+
+/* SYSFS functions */
+#define ufshpb_sysfs_param_show_func(__name)				\
+static ssize_t __name##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct scsi_device *sdev = to_scsi_device(dev);			\
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);		\
+									\
+	if (!hpb)							\
+		return -ENODEV;						\
+									\
+	return sysfs_emit(buf, "%d\n", hpb->params.__name);		\
+}
+
+ufshpb_sysfs_param_show_func(requeue_timeout_ms);
+static ssize_t
+requeue_timeout_ms_store(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val < 0)
+		return -EINVAL;
+
+	hpb->params.requeue_timeout_ms = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(requeue_timeout_ms);
+
+ufshpb_sysfs_param_show_func(activation_thld);
+static ssize_t
+activation_thld_store(struct device *dev, struct device_attribute *attr,
+		      const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= 0)
+		return -EINVAL;
+
+	hpb->params.activation_thld = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(activation_thld);
+
+ufshpb_sysfs_param_show_func(normalization_factor);
+static ssize_t
+normalization_factor_store(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= 0 || val > ilog2(hpb->entries_per_srgn))
+		return -EINVAL;
+
+	hpb->params.normalization_factor = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(normalization_factor);
+
+ufshpb_sysfs_param_show_func(eviction_thld_enter);
+static ssize_t
+eviction_thld_enter_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= hpb->params.eviction_thld_exit)
+		return -EINVAL;
+
+	hpb->params.eviction_thld_enter = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(eviction_thld_enter);
+
+ufshpb_sysfs_param_show_func(eviction_thld_exit);
+static ssize_t
+eviction_thld_exit_store(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= hpb->params.activation_thld)
+		return -EINVAL;
+
+	hpb->params.eviction_thld_exit = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(eviction_thld_exit);
+
+ufshpb_sysfs_param_show_func(read_timeout_ms);
+static ssize_t
+read_timeout_ms_store(struct device *dev, struct device_attribute *attr,
+		      const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	/* read_timeout >> timeout_polling_interval */
+	if (val < hpb->params.timeout_polling_interval_ms * 2)
+		return -EINVAL;
+
+	hpb->params.read_timeout_ms = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(read_timeout_ms);
+
+ufshpb_sysfs_param_show_func(read_timeout_expiries);
+static ssize_t
+read_timeout_expiries_store(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= 0)
+		return -EINVAL;
+
+	hpb->params.read_timeout_expiries = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(read_timeout_expiries);
+
+ufshpb_sysfs_param_show_func(timeout_polling_interval_ms);
+static ssize_t
+timeout_polling_interval_ms_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	/* timeout_polling_interval << read_timeout */
+	if (val <= 0 || val > hpb->params.read_timeout_ms / 2)
+		return -EINVAL;
+
+	hpb->params.timeout_polling_interval_ms = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(timeout_polling_interval_ms);
+
+ufshpb_sysfs_param_show_func(inflight_map_req);
+static ssize_t inflight_map_req_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+	int val;
+
+	if (!hpb)
+		return -ENODEV;
+
+	if (!hpb->is_hcm)
+		return -EOPNOTSUPP;
+
+	if (kstrtouint(buf, 0, &val))
+		return -EINVAL;
+
+	if (val <= 0 || val > hpb->sdev_ufs_lu->queue_depth - 1)
+		return -EINVAL;
+
+	hpb->params.inflight_map_req = val;
+
+	return count;
+}
+static DEVICE_ATTR_RW(inflight_map_req);
+
+static void ufshpb_hcm_param_init(struct ufshpb_lu *hpb)
+{
+	hpb->params.activation_thld = ACTIVATION_THRESHOLD;
+	hpb->params.normalization_factor = 1;
+	hpb->params.eviction_thld_enter = (ACTIVATION_THRESHOLD << 5);
+	hpb->params.eviction_thld_exit = (ACTIVATION_THRESHOLD << 4);
+	hpb->params.read_timeout_ms = READ_TO_MS;
+	hpb->params.read_timeout_expiries = READ_TO_EXPIRIES;
+	hpb->params.timeout_polling_interval_ms = POLLING_INTERVAL_MS;
+	hpb->params.inflight_map_req = THROTTLE_MAP_REQ_DEFAULT;
+}
+
+static struct attribute *hpb_dev_param_attrs[] = {
+	&dev_attr_requeue_timeout_ms.attr,
+	&dev_attr_activation_thld.attr,
+	&dev_attr_normalization_factor.attr,
+	&dev_attr_eviction_thld_enter.attr,
+	&dev_attr_eviction_thld_exit.attr,
+	&dev_attr_read_timeout_ms.attr,
+	&dev_attr_read_timeout_expiries.attr,
+	&dev_attr_timeout_polling_interval_ms.attr,
+	&dev_attr_inflight_map_req.attr,
+	NULL,
+};
+
+struct attribute_group ufs_sysfs_hpb_param_group = {
+	.name = "hpb_params",
+	.attrs = hpb_dev_param_attrs,
+};
+
+static int ufshpb_pre_req_mempool_init(struct ufshpb_lu *hpb)
+{
+	struct ufshpb_req *pre_req = NULL, *t;
+	int qd = hpb->sdev_ufs_lu->queue_depth / 2;
+	int i;
+
+	INIT_LIST_HEAD(&hpb->lh_pre_req_free);
+
+	hpb->pre_req = kcalloc(qd, sizeof(struct ufshpb_req), GFP_KERNEL);
+	hpb->throttle_pre_req = qd;
+	hpb->num_inflight_pre_req = 0;
+
+	if (!hpb->pre_req)
+		goto release_mem;
+
+	for (i = 0; i < qd; i++) {
+		pre_req = hpb->pre_req + i;
+		INIT_LIST_HEAD(&pre_req->list_req);
+		pre_req->req = NULL;
+
+		pre_req->bio = bio_alloc(NULL, 1, 0, GFP_KERNEL);
+		if (!pre_req->bio)
+			goto release_mem;
+
+		pre_req->wb.m_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+		if (!pre_req->wb.m_page) {
+			bio_put(pre_req->bio);
+			goto release_mem;
+		}
+
+		list_add_tail(&pre_req->list_req, &hpb->lh_pre_req_free);
+	}
+
+	return 0;
+release_mem:
+	list_for_each_entry_safe(pre_req, t, &hpb->lh_pre_req_free, list_req) {
+		list_del_init(&pre_req->list_req);
+		bio_put(pre_req->bio);
+		__free_page(pre_req->wb.m_page);
+	}
+
+	kfree(hpb->pre_req);
+	return -ENOMEM;
+}
+
+static void ufshpb_pre_req_mempool_destroy(struct ufshpb_lu *hpb)
+{
+	struct ufshpb_req *pre_req = NULL;
+	int i;
+
+	for (i = 0; i < hpb->throttle_pre_req; i++) {
+		pre_req = hpb->pre_req + i;
+		bio_put(hpb->pre_req[i].bio);
+		if (!pre_req->wb.m_page)
+			__free_page(hpb->pre_req[i].wb.m_page);
+		list_del_init(&pre_req->list_req);
+	}
+
+	kfree(hpb->pre_req);
+}
+
+static void ufshpb_stat_init(struct ufshpb_lu *hpb)
+{
+	hpb->stats.hit_cnt = 0;
+	hpb->stats.miss_cnt = 0;
+	hpb->stats.rcmd_noti_cnt = 0;
+	hpb->stats.rcmd_active_cnt = 0;
+	hpb->stats.rcmd_inactive_cnt = 0;
+	hpb->stats.map_req_cnt = 0;
+	hpb->stats.umap_req_cnt = 0;
+}
+
+static void ufshpb_param_init(struct ufshpb_lu *hpb)
+{
+	hpb->params.requeue_timeout_ms = HPB_REQUEUE_TIME_MS;
+	if (hpb->is_hcm)
+		ufshpb_hcm_param_init(hpb);
+}
+
+static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb)
+{
+	int ret;
+
+	spin_lock_init(&hpb->rgn_state_lock);
+	spin_lock_init(&hpb->rsp_list_lock);
+	spin_lock_init(&hpb->param_lock);
+
+	INIT_LIST_HEAD(&hpb->lru_info.lh_lru_rgn);
+	INIT_LIST_HEAD(&hpb->lh_act_srgn);
+	INIT_LIST_HEAD(&hpb->lh_inact_rgn);
+	INIT_LIST_HEAD(&hpb->list_hpb_lu);
+
+	INIT_WORK(&hpb->map_work, ufshpb_map_work_handler);
+	if (hpb->is_hcm) {
+		INIT_WORK(&hpb->ufshpb_normalization_work,
+			  ufshpb_normalization_work_handler);
+		INIT_DELAYED_WORK(&hpb->ufshpb_read_to_work,
+				  ufshpb_read_to_handler);
+	}
+
+	hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
+			  sizeof(struct ufshpb_req), 0, 0, NULL);
+	if (!hpb->map_req_cache) {
+		dev_err(hba->dev, "ufshpb(%d) ufshpb_req_cache create fail",
+			hpb->lun);
+		return -ENOMEM;
+	}
+
+	hpb->m_page_cache = kmem_cache_create("ufshpb_m_page_cache",
+			  sizeof(struct page *) * hpb->pages_per_srgn,
+			  0, 0, NULL);
+	if (!hpb->m_page_cache) {
+		dev_err(hba->dev, "ufshpb(%d) ufshpb_m_page_cache create fail",
+			hpb->lun);
+		ret = -ENOMEM;
+		goto release_req_cache;
+	}
+
+	ret = ufshpb_pre_req_mempool_init(hpb);
+	if (ret) {
+		dev_err(hba->dev, "ufshpb(%d) pre_req_mempool init fail",
+			hpb->lun);
+		goto release_m_page_cache;
+	}
+
+	ret = ufshpb_alloc_region_tbl(hba, hpb);
+	if (ret)
+		goto release_pre_req_mempool;
+
+	ufshpb_stat_init(hpb);
+	ufshpb_param_init(hpb);
+
+	if (hpb->is_hcm) {
+		unsigned int poll;
+
+		poll = hpb->params.timeout_polling_interval_ms;
+		schedule_delayed_work(&hpb->ufshpb_read_to_work,
+				      msecs_to_jiffies(poll));
+	}
+
+	return 0;
+
+release_pre_req_mempool:
+	ufshpb_pre_req_mempool_destroy(hpb);
+release_m_page_cache:
+	kmem_cache_destroy(hpb->m_page_cache);
+release_req_cache:
+	kmem_cache_destroy(hpb->map_req_cache);
+	return ret;
+}
+
+static struct ufshpb_lu *
+ufshpb_alloc_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev,
+		    struct ufshpb_dev_info *hpb_dev_info,
+		    struct ufshpb_lu_info *hpb_lu_info)
+{
+	struct ufshpb_lu *hpb;
+	int ret;
+
+	hpb = kzalloc(sizeof(struct ufshpb_lu), GFP_KERNEL);
+	if (!hpb)
+		return NULL;
+
+	hpb->lun = sdev->lun;
+	hpb->sdev_ufs_lu = sdev;
+
+	ufshpb_lu_parameter_init(hba, hpb, hpb_dev_info, hpb_lu_info);
+
+	ret = ufshpb_lu_hpb_init(hba, hpb);
+	if (ret) {
+		dev_err(hba->dev, "hpb lu init failed. ret %d", ret);
+		goto release_hpb;
+	}
+
+	sdev->hostdata = hpb;
+	return hpb;
+
+release_hpb:
+	kfree(hpb);
+	return NULL;
+}
+
+static void ufshpb_discard_rsp_lists(struct ufshpb_lu *hpb)
+{
+	struct ufshpb_region *rgn, *next_rgn;
+	struct ufshpb_subregion *srgn, *next_srgn;
+	unsigned long flags;
+
+	/*
+	 * If the device reset occurred, the remaining HPB region information
+	 * may be stale. Therefore, by discarding the lists of HPB response
+	 * that remained after reset, we prevent unnecessary work.
+	 */
+	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+	list_for_each_entry_safe(rgn, next_rgn, &hpb->lh_inact_rgn,
+				 list_inact_rgn)
+		list_del_init(&rgn->list_inact_rgn);
+
+	list_for_each_entry_safe(srgn, next_srgn, &hpb->lh_act_srgn,
+				 list_act_srgn)
+		list_del_init(&srgn->list_act_srgn);
+	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static void ufshpb_cancel_jobs(struct ufshpb_lu *hpb)
+{
+	if (hpb->is_hcm) {
+		cancel_delayed_work_sync(&hpb->ufshpb_read_to_work);
+		cancel_work_sync(&hpb->ufshpb_normalization_work);
+	}
+	cancel_work_sync(&hpb->map_work);
+}
+
+static bool ufshpb_check_hpb_reset_query(struct ufs_hba *hba)
+{
+	int err = 0;
+	bool flag_res = true;
+	int try;
+
+	/* wait for the device to complete HPB reset query */
+	for (try = 0; try < HPB_RESET_REQ_RETRIES; try++) {
+		dev_dbg(hba->dev,
+			"%s start flag reset polling %d times\n",
+			__func__, try);
+
+		/* Poll fHpbReset flag to be cleared */
+		err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+				QUERY_FLAG_IDN_HPB_RESET, 0, &flag_res);
+
+		if (err) {
+			dev_err(hba->dev,
+				"%s reading fHpbReset flag failed with error %d\n",
+				__func__, err);
+			return flag_res;
+		}
+
+		if (!flag_res)
+			goto out;
+
+		usleep_range(1000, 1100);
+	}
+	if (flag_res) {
+		dev_err(hba->dev,
+			"%s fHpbReset was not cleared by the device\n",
+			__func__);
+	}
+out:
+	return flag_res;
+}
+
+/**
+ * ufshpb_toggle_state - switch HPB state of all LUs
+ * @hba: per-adapter instance
+ * @src: expected current HPB state
+ * @dest: target HPB state to switch to
+ */
+void ufshpb_toggle_state(struct ufs_hba *hba, enum UFSHPB_STATE src, enum UFSHPB_STATE dest)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = ufshpb_get_hpb_data(sdev);
+
+		if (!hpb || ufshpb_get_state(hpb) != src)
+			continue;
+		ufshpb_set_state(hpb, dest);
+
+		if (dest == HPB_RESET) {
+			ufshpb_cancel_jobs(hpb);
+			ufshpb_discard_rsp_lists(hpb);
+		}
+	}
+}
+
+void ufshpb_suspend(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = ufshpb_get_hpb_data(sdev);
+		if (!hpb || ufshpb_get_state(hpb) != HPB_PRESENT)
+			continue;
+
+		ufshpb_set_state(hpb, HPB_SUSPEND);
+		ufshpb_cancel_jobs(hpb);
+	}
+}
+
+void ufshpb_resume(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = ufshpb_get_hpb_data(sdev);
+		if (!hpb || ufshpb_get_state(hpb) != HPB_SUSPEND)
+			continue;
+
+		ufshpb_set_state(hpb, HPB_PRESENT);
+		ufshpb_kick_map_work(hpb);
+		if (hpb->is_hcm) {
+			unsigned int poll = hpb->params.timeout_polling_interval_ms;
+
+			schedule_delayed_work(&hpb->ufshpb_read_to_work, msecs_to_jiffies(poll));
+		}
+	}
+}
+
+static int ufshpb_get_lu_info(struct ufs_hba *hba, int lun,
+			      struct ufshpb_lu_info *hpb_lu_info)
+{
+	u16 max_active_rgns;
+	u8 lu_enable;
+	int size;
+	int ret;
+	char desc_buf[QUERY_DESC_MAX_SIZE];
+
+	ufshcd_map_desc_id_to_length(hba, QUERY_DESC_IDN_UNIT, &size);
+
+	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+					    QUERY_DESC_IDN_UNIT, lun, 0,
+					    desc_buf, &size);
+	ufshcd_rpm_put_sync(hba);
+
+	if (ret) {
+		dev_err(hba->dev,
+			"%s: idn: %d lun: %d  query request failed",
+			__func__, QUERY_DESC_IDN_UNIT, lun);
+		return ret;
+	}
+
+	lu_enable = desc_buf[UNIT_DESC_PARAM_LU_ENABLE];
+	if (lu_enable != LU_ENABLED_HPB_FUNC)
+		return -ENODEV;
+
+	max_active_rgns = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_LU_MAX_ACTIVE_RGNS);
+	if (!max_active_rgns) {
+		dev_err(hba->dev,
+			"lun %d wrong number of max active regions\n", lun);
+		return -ENODEV;
+	}
+
+	hpb_lu_info->num_blocks = get_unaligned_be64(
+			desc_buf + UNIT_DESC_PARAM_LOGICAL_BLK_COUNT);
+	hpb_lu_info->pinned_start = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_PIN_RGN_START_OFF);
+	hpb_lu_info->num_pinned = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_NUM_PIN_RGNS);
+	hpb_lu_info->max_active_rgns = max_active_rgns;
+
+	return 0;
+}
+
+void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
+
+	if (!hpb)
+		return;
+
+	ufshpb_set_state(hpb, HPB_FAILED);
+
+	sdev = hpb->sdev_ufs_lu;
+	sdev->hostdata = NULL;
+
+	ufshpb_cancel_jobs(hpb);
+
+	ufshpb_pre_req_mempool_destroy(hpb);
+	ufshpb_destroy_region_tbl(hpb);
+
+	kmem_cache_destroy(hpb->map_req_cache);
+	kmem_cache_destroy(hpb->m_page_cache);
+
+	list_del_init(&hpb->list_hpb_lu);
+
+	kfree(hpb);
+}
+
+static void ufshpb_hpb_lu_prepared(struct ufs_hba *hba)
+{
+	int pool_size;
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+	bool init_success;
+
+	if (tot_active_srgn_pages == 0) {
+		ufshpb_remove(hba);
+		return;
+	}
+
+	init_success = !ufshpb_check_hpb_reset_query(hba);
+
+	pool_size = PAGE_ALIGN(ufshpb_host_map_kbytes * 1024) / PAGE_SIZE;
+	if (pool_size > tot_active_srgn_pages) {
+		mempool_resize(ufshpb_mctx_pool, tot_active_srgn_pages);
+		mempool_resize(ufshpb_page_pool, tot_active_srgn_pages);
+	}
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = ufshpb_get_hpb_data(sdev);
+		if (!hpb)
+			continue;
+
+		if (init_success) {
+			ufshpb_set_state(hpb, HPB_PRESENT);
+			if ((hpb->lu_pinned_end - hpb->lu_pinned_start) > 0)
+				queue_work(ufshpb_wq, &hpb->map_work);
+		} else {
+			dev_err(hba->dev, "destroy HPB lu %d\n", hpb->lun);
+			ufshpb_destroy_lu(hba, sdev);
+		}
+	}
+
+	if (!init_success)
+		ufshpb_remove(hba);
+}
+
+void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct ufshpb_lu *hpb;
+	int ret;
+	struct ufshpb_lu_info hpb_lu_info = { 0 };
+	int lun = sdev->lun;
+
+	if (lun >= hba->dev_info.max_lu_supported)
+		goto out;
+
+	ret = ufshpb_get_lu_info(hba, lun, &hpb_lu_info);
+	if (ret)
+		goto out;
+
+	hpb = ufshpb_alloc_hpb_lu(hba, sdev, &hba->ufshpb_dev,
+				  &hpb_lu_info);
+	if (!hpb)
+		goto out;
+
+	tot_active_srgn_pages += hpb_lu_info.max_active_rgns *
+			hpb->srgns_per_rgn * hpb->pages_per_srgn;
+
+out:
+	/* All LUs are initialized */
+	if (atomic_dec_and_test(&hba->ufshpb_dev.slave_conf_cnt))
+		ufshpb_hpb_lu_prepared(hba);
+}
+
+static int ufshpb_init_mem_wq(struct ufs_hba *hba)
+{
+	int ret;
+	unsigned int pool_size;
+
+	ufshpb_mctx_cache = kmem_cache_create("ufshpb_mctx_cache",
+					sizeof(struct ufshpb_map_ctx),
+					0, 0, NULL);
+	if (!ufshpb_mctx_cache) {
+		dev_err(hba->dev, "ufshpb: cannot init mctx cache\n");
+		return -ENOMEM;
+	}
+
+	pool_size = PAGE_ALIGN(ufshpb_host_map_kbytes * 1024) / PAGE_SIZE;
+	dev_info(hba->dev, "%s:%d ufshpb_host_map_kbytes %u pool_size %u\n",
+	       __func__, __LINE__, ufshpb_host_map_kbytes, pool_size);
+
+	ufshpb_mctx_pool = mempool_create_slab_pool(pool_size,
+						    ufshpb_mctx_cache);
+	if (!ufshpb_mctx_pool) {
+		dev_err(hba->dev, "ufshpb: cannot init mctx pool\n");
+		ret = -ENOMEM;
+		goto release_mctx_cache;
+	}
+
+	ufshpb_page_pool = mempool_create_page_pool(pool_size, 0);
+	if (!ufshpb_page_pool) {
+		dev_err(hba->dev, "ufshpb: cannot init page pool\n");
+		ret = -ENOMEM;
+		goto release_mctx_pool;
+	}
+
+	ufshpb_wq = alloc_workqueue("ufshpb-wq",
+					WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
+	if (!ufshpb_wq) {
+		dev_err(hba->dev, "ufshpb: alloc workqueue failed\n");
+		ret = -ENOMEM;
+		goto release_page_pool;
+	}
+
+	return 0;
+
+release_page_pool:
+	mempool_destroy(ufshpb_page_pool);
+release_mctx_pool:
+	mempool_destroy(ufshpb_mctx_pool);
+release_mctx_cache:
+	kmem_cache_destroy(ufshpb_mctx_cache);
+	return ret;
+}
+
+void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf)
+{
+	struct ufshpb_dev_info *hpb_info = &hba->ufshpb_dev;
+	int max_active_rgns = 0;
+	int hpb_num_lu;
+
+	hpb_num_lu = geo_buf[GEOMETRY_DESC_PARAM_HPB_NUMBER_LU];
+	if (hpb_num_lu == 0) {
+		dev_err(hba->dev, "No HPB LU supported\n");
+		hpb_info->hpb_disabled = true;
+		return;
+	}
+
+	hpb_info->rgn_size = geo_buf[GEOMETRY_DESC_PARAM_HPB_REGION_SIZE];
+	hpb_info->srgn_size = geo_buf[GEOMETRY_DESC_PARAM_HPB_SUBREGION_SIZE];
+	max_active_rgns = get_unaligned_be16(geo_buf +
+			  GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS);
+
+	if (hpb_info->rgn_size == 0 || hpb_info->srgn_size == 0 ||
+	    max_active_rgns == 0) {
+		dev_err(hba->dev, "No HPB supported device\n");
+		hpb_info->hpb_disabled = true;
+		return;
+	}
+}
+
+void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
+	int version, ret;
+	int max_single_cmd;
+
+	hpb_dev_info->control_mode = desc_buf[DEVICE_DESC_PARAM_HPB_CONTROL];
+
+	version = get_unaligned_be16(desc_buf + DEVICE_DESC_PARAM_HPB_VER);
+	if ((version != HPB_SUPPORT_VERSION) &&
+	    (version != HPB_SUPPORT_LEGACY_VERSION)) {
+		dev_err(hba->dev, "%s: HPB %x version is not supported.\n",
+			__func__, version);
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+
+	if (version == HPB_SUPPORT_LEGACY_VERSION)
+		hpb_dev_info->is_legacy = true;
+
+	/*
+	 * Get the number of user logical unit to check whether all
+	 * scsi_device finish initialization
+	 */
+	hpb_dev_info->num_lu = desc_buf[DEVICE_DESC_PARAM_NUM_LU];
+
+	if (hpb_dev_info->is_legacy)
+		return;
+
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+		QUERY_ATTR_IDN_MAX_HPB_SINGLE_CMD, 0, 0, &max_single_cmd);
+
+	if (ret)
+		hpb_dev_info->max_hpb_single_cmd = HPB_LEGACY_CHUNK_HIGH;
+	else
+		hpb_dev_info->max_hpb_single_cmd = min(max_single_cmd + 1, HPB_MULTI_CHUNK_HIGH);
+}
+
+void ufshpb_init(struct ufs_hba *hba)
+{
+	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
+	int try;
+	int ret;
+
+	if (!ufshpb_is_allowed(hba) || !hba->dev_info.hpb_enabled)
+		return;
+
+	if (ufshpb_init_mem_wq(hba)) {
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+
+	atomic_set(&hpb_dev_info->slave_conf_cnt, hpb_dev_info->num_lu);
+	tot_active_srgn_pages = 0;
+	/* issue HPB reset query */
+	for (try = 0; try < HPB_RESET_REQ_RETRIES; try++) {
+		ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+					QUERY_FLAG_IDN_HPB_RESET, 0, NULL);
+		if (!ret)
+			break;
+	}
+}
+
+void ufshpb_remove(struct ufs_hba *hba)
+{
+	mempool_destroy(ufshpb_page_pool);
+	mempool_destroy(ufshpb_mctx_pool);
+	kmem_cache_destroy(ufshpb_mctx_cache);
+
+	destroy_workqueue(ufshpb_wq);
+}
+
+module_param(ufshpb_host_map_kbytes, uint, 0644);
+MODULE_PARM_DESC(ufshpb_host_map_kbytes,
+	"ufshpb host mapping memory kilo-bytes for ufshpb memory-pool");
diff --git a/drivers/ufs/core/ufshpb.h b/drivers/ufs/core/ufshpb.h
new file mode 100644
index 000000000000..0d6e6004d783
--- /dev/null
+++ b/drivers/ufs/core/ufshpb.h
@@ -0,0 +1,318 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Universal Flash Storage Host Performance Booster
+ *
+ * Copyright (C) 2017-2021 Samsung Electronics Co., Ltd.
+ *
+ * Authors:
+ *	Yongmyung Lee <ymhungry.lee@samsung.com>
+ *	Jinyoung Choi <j-young.choi@samsung.com>
+ */
+
+#ifndef _UFSHPB_H_
+#define _UFSHPB_H_
+
+/* hpb response UPIU macro */
+#define HPB_RSP_NONE				0x0
+#define HPB_RSP_REQ_REGION_UPDATE		0x1
+#define HPB_RSP_DEV_RESET			0x2
+#define MAX_ACTIVE_NUM				2
+#define MAX_INACTIVE_NUM			2
+#define DEV_DATA_SEG_LEN			0x14
+#define DEV_SENSE_SEG_LEN			0x12
+#define DEV_DES_TYPE				0x80
+#define DEV_ADDITIONAL_LEN			0x10
+
+/* hpb map & entries macro */
+#define HPB_RGN_SIZE_UNIT			512
+#define HPB_ENTRY_BLOCK_SIZE			4096
+#define HPB_ENTRY_SIZE				0x8
+#define PINNED_NOT_SET				U32_MAX
+
+/* hpb support chunk size */
+#define HPB_LEGACY_CHUNK_HIGH			1
+#define HPB_MULTI_CHUNK_HIGH			255
+
+/* hpb vender defined opcode */
+#define UFSHPB_READ				0xF8
+#define UFSHPB_READ_BUFFER			0xF9
+#define UFSHPB_READ_BUFFER_ID			0x01
+#define UFSHPB_WRITE_BUFFER			0xFA
+#define UFSHPB_WRITE_BUFFER_INACT_SINGLE_ID	0x01
+#define UFSHPB_WRITE_BUFFER_PREFETCH_ID		0x02
+#define UFSHPB_WRITE_BUFFER_INACT_ALL_ID	0x03
+#define HPB_WRITE_BUFFER_CMD_LENGTH		10
+#define MAX_HPB_READ_ID				0x7F
+#define HPB_READ_BUFFER_CMD_LENGTH		10
+#define LU_ENABLED_HPB_FUNC			0x02
+
+#define HPB_RESET_REQ_RETRIES			10
+#define HPB_MAP_REQ_RETRIES			5
+#define HPB_REQUEUE_TIME_MS			0
+
+#define HPB_SUPPORT_VERSION			0x200
+#define HPB_SUPPORT_LEGACY_VERSION		0x100
+
+enum UFSHPB_MODE {
+	HPB_HOST_CONTROL,
+	HPB_DEVICE_CONTROL,
+};
+
+enum UFSHPB_STATE {
+	HPB_INIT,
+	HPB_PRESENT,
+	HPB_SUSPEND,
+	HPB_FAILED,
+	HPB_RESET,
+};
+
+enum HPB_RGN_STATE {
+	HPB_RGN_INACTIVE,
+	HPB_RGN_ACTIVE,
+	/* pinned regions are always active */
+	HPB_RGN_PINNED,
+};
+
+enum HPB_SRGN_STATE {
+	HPB_SRGN_UNUSED,
+	HPB_SRGN_INVALID,
+	HPB_SRGN_VALID,
+	HPB_SRGN_ISSUED,
+};
+
+/**
+ * struct ufshpb_lu_info - UFSHPB logical unit related info
+ * @num_blocks: the number of logical block
+ * @pinned_start: the start region number of pinned region
+ * @num_pinned: the number of pinned regions
+ * @max_active_rgns: maximum number of active regions
+ */
+struct ufshpb_lu_info {
+	int num_blocks;
+	int pinned_start;
+	int num_pinned;
+	int max_active_rgns;
+};
+
+struct ufshpb_map_ctx {
+	struct page **m_page;
+	unsigned long *ppn_dirty;
+};
+
+struct ufshpb_subregion {
+	struct ufshpb_map_ctx *mctx;
+	enum HPB_SRGN_STATE srgn_state;
+	int rgn_idx;
+	int srgn_idx;
+	bool is_last;
+
+	/* subregion reads - for host mode */
+	unsigned int reads;
+
+	/* below information is used by rsp_list */
+	struct list_head list_act_srgn;
+};
+
+struct ufshpb_region {
+	struct ufshpb_lu *hpb;
+	struct ufshpb_subregion *srgn_tbl;
+	enum HPB_RGN_STATE rgn_state;
+	int rgn_idx;
+	int srgn_cnt;
+
+	/* below information is used by rsp_list */
+	struct list_head list_inact_rgn;
+
+	/* below information is used by lru */
+	struct list_head list_lru_rgn;
+	unsigned long rgn_flags;
+#define RGN_FLAG_DIRTY 0
+#define RGN_FLAG_UPDATE 1
+
+	/* region reads - for host mode */
+	spinlock_t rgn_lock;
+	unsigned int reads;
+	/* region "cold" timer - for host mode */
+	ktime_t read_timeout;
+	unsigned int read_timeout_expiries;
+	struct list_head list_expired_rgn;
+};
+
+#define for_each_sub_region(rgn, i, srgn)				\
+	for ((i) = 0;							\
+	     ((i) < (rgn)->srgn_cnt) && ((srgn) = &(rgn)->srgn_tbl[i]); \
+	     (i)++)
+
+/**
+ * struct ufshpb_req - HPB related request structure (write/read buffer)
+ * @req: block layer request structure
+ * @bio: bio for this request
+ * @hpb: ufshpb_lu structure that related to
+ * @list_req: ufshpb_req mempool list
+ * @sense: store its sense data
+ * @mctx: L2P map information
+ * @rgn_idx: target region index
+ * @srgn_idx: target sub-region index
+ * @lun: target logical unit number
+ * @m_page: L2P map information data for pre-request
+ * @len: length of host-side cached L2P map in m_page
+ * @lpn: start LPN of L2P map in m_page
+ */
+struct ufshpb_req {
+	struct request *req;
+	struct bio *bio;
+	struct ufshpb_lu *hpb;
+	struct list_head list_req;
+	union {
+		struct {
+			struct ufshpb_map_ctx *mctx;
+			unsigned int rgn_idx;
+			unsigned int srgn_idx;
+			unsigned int lun;
+		} rb;
+		struct {
+			struct page *m_page;
+			unsigned int len;
+			unsigned long lpn;
+		} wb;
+	};
+};
+
+struct victim_select_info {
+	struct list_head lh_lru_rgn; /* LRU list of regions */
+	int max_lru_active_cnt; /* supported hpb #region - pinned #region */
+	atomic_t active_cnt;
+};
+
+/**
+ * ufshpb_params - ufs hpb parameters
+ * @requeue_timeout_ms - requeue threshold of wb command (0x2)
+ * @activation_thld - min reads [IOs] to activate/update a region
+ * @normalization_factor - shift right the region's reads
+ * @eviction_thld_enter - min reads [IOs] for the entering region in eviction
+ * @eviction_thld_exit - max reads [IOs] for the exiting region in eviction
+ * @read_timeout_ms - timeout [ms] from the last read IO to the region
+ * @read_timeout_expiries - amount of allowable timeout expireis
+ * @timeout_polling_interval_ms - frequency in which timeouts are checked
+ * @inflight_map_req - number of inflight map requests
+ */
+struct ufshpb_params {
+	unsigned int requeue_timeout_ms;
+	unsigned int activation_thld;
+	unsigned int normalization_factor;
+	unsigned int eviction_thld_enter;
+	unsigned int eviction_thld_exit;
+	unsigned int read_timeout_ms;
+	unsigned int read_timeout_expiries;
+	unsigned int timeout_polling_interval_ms;
+	unsigned int inflight_map_req;
+};
+
+struct ufshpb_stats {
+	u64 hit_cnt;
+	u64 miss_cnt;
+	u64 rcmd_noti_cnt;
+	u64 rcmd_active_cnt;
+	u64 rcmd_inactive_cnt;
+	u64 map_req_cnt;
+	u64 pre_req_cnt;
+	u64 umap_req_cnt;
+};
+
+struct ufshpb_lu {
+	int lun;
+	struct scsi_device *sdev_ufs_lu;
+
+	spinlock_t rgn_state_lock; /* for protect rgn/srgn state */
+	struct ufshpb_region *rgn_tbl;
+
+	atomic_t hpb_state;
+
+	spinlock_t rsp_list_lock;
+	struct list_head lh_act_srgn; /* hold rsp_list_lock */
+	struct list_head lh_inact_rgn; /* hold rsp_list_lock */
+
+	/* pre request information */
+	struct ufshpb_req *pre_req;
+	int num_inflight_pre_req;
+	int throttle_pre_req;
+	int num_inflight_map_req; /* hold param_lock */
+	spinlock_t param_lock;
+
+	struct list_head lh_pre_req_free;
+	int pre_req_max_tr_len;
+
+	/* cached L2P map management worker */
+	struct work_struct map_work;
+
+	/* for selecting victim */
+	struct victim_select_info lru_info;
+	struct work_struct ufshpb_normalization_work;
+	struct delayed_work ufshpb_read_to_work;
+	unsigned long work_data_bits;
+#define TIMEOUT_WORK_RUNNING 0
+
+	/* pinned region information */
+	u32 lu_pinned_start;
+	u32 lu_pinned_end;
+
+	/* HPB related configuration */
+	u32 rgns_per_lu;
+	u32 srgns_per_lu;
+	u32 last_srgn_entries;
+	int srgns_per_rgn;
+	u32 srgn_mem_size;
+	u32 entries_per_rgn_mask;
+	u32 entries_per_rgn_shift;
+	u32 entries_per_srgn;
+	u32 entries_per_srgn_mask;
+	u32 entries_per_srgn_shift;
+	u32 pages_per_srgn;
+
+	bool is_hcm;
+
+	struct ufshpb_stats stats;
+	struct ufshpb_params params;
+
+	struct kmem_cache *map_req_cache;
+	struct kmem_cache *m_page_cache;
+
+	struct list_head list_hpb_lu;
+};
+
+struct ufs_hba;
+struct ufshcd_lrb;
+
+#ifndef CONFIG_SCSI_UFS_HPB
+static int ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) { return 0; }
+static void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) {}
+static void ufshpb_resume(struct ufs_hba *hba) {}
+static void ufshpb_suspend(struct ufs_hba *hba) {}
+static void ufshpb_toggle_state(struct ufs_hba *hba, enum UFSHPB_STATE src, enum UFSHPB_STATE dest) {}
+static void ufshpb_init(struct ufs_hba *hba) {}
+static void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev) {}
+static void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev) {}
+static void ufshpb_remove(struct ufs_hba *hba) {}
+static bool ufshpb_is_allowed(struct ufs_hba *hba) { return false; }
+static void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf) {}
+static void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf) {}
+static bool ufshpb_is_legacy(struct ufs_hba *hba) { return false; }
+#else
+int ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp);
+void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp);
+void ufshpb_resume(struct ufs_hba *hba);
+void ufshpb_suspend(struct ufs_hba *hba);
+void ufshpb_toggle_state(struct ufs_hba *hba, enum UFSHPB_STATE src, enum UFSHPB_STATE dest);
+void ufshpb_init(struct ufs_hba *hba);
+void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev);
+void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev);
+void ufshpb_remove(struct ufs_hba *hba);
+bool ufshpb_is_allowed(struct ufs_hba *hba);
+void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf);
+void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf);
+bool ufshpb_is_legacy(struct ufs_hba *hba);
+extern struct attribute_group ufs_sysfs_hpb_stat_group;
+extern struct attribute_group ufs_sysfs_hpb_param_group;
+#endif
+
+#endif /* End of Header */