scsi: cxlflash: Staging to support future accelerators

As staging to support future accelerator transports, add a shim layer
such that the underlying services the cxlflash driver requires can be
conditional upon the accelerator infrastructure.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

6 files changed, 263 insertions, 78 deletions

diff --git a/drivers/scsi/cxlflash/Makefile b/drivers/scsi/cxlflash/Makefile
index 9e39866d473b..7ec3f6b55dde 100644
--- a/drivers/scsi/cxlflash/Makefile
+++ b/drivers/scsi/cxlflash/Makefile
@@ -1,2 +1,2 @@
 obj-$(CONFIG_CXLFLASH) += cxlflash.o
-cxlflash-y += main.o superpipe.o lunmgt.o vlun.o
+cxlflash-y += main.o superpipe.o lunmgt.o vlun.o cxl_hw.o
diff --git a/drivers/scsi/cxlflash/backend.h b/drivers/scsi/cxlflash/backend.h
new file mode 100644
index 000000000000..339e42b03c49
--- /dev/null
+++ b/drivers/scsi/cxlflash/backend.h
@@ -0,0 +1,41 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2018 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+extern const struct cxlflash_backend_ops cxlflash_cxl_ops;
+
+struct cxlflash_backend_ops {
+	struct module *module;
+	void __iomem * (*psa_map)(void *);
+	void (*psa_unmap)(void __iomem *);
+	int (*process_element)(void *);
+	int (*map_afu_irq)(void *, int, irq_handler_t, void *, char *);
+	void (*unmap_afu_irq)(void *, int, void *);
+	int (*start_context)(void *);
+	int (*stop_context)(void *);
+	int (*afu_reset)(void *);
+	void (*set_master)(void *);
+	void * (*get_context)(struct pci_dev *, void *);
+	void * (*dev_context_init)(struct pci_dev *, void *);
+	int (*release_context)(void *);
+	void (*perst_reloads_same_image)(void *, bool);
+	ssize_t (*read_adapter_vpd)(struct pci_dev *, void *, size_t);
+	int (*allocate_afu_irqs)(void *, int);
+	void (*free_afu_irqs)(void *);
+	void * (*create_afu)(struct pci_dev *);
+	struct file * (*get_fd)(void *, struct file_operations *, int *);
+	void * (*fops_get_context)(struct file *);
+	int (*start_work)(void *, u64);
+	int (*fd_mmap)(struct file *, struct vm_area_struct *);
+	int (*fd_release)(struct inode *, struct file *);
+};
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index 48df89f6f0b3..102fd26ca886 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -25,6 +25,8 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 
+#include "backend.h"
+
 extern const struct file_operations cxlflash_cxl_fops;
 
 #define MAX_CONTEXT	CXLFLASH_MAX_CONTEXT	/* num contexts per afu */
@@ -114,6 +116,7 @@ enum cxlflash_hwq_mode {
 struct cxlflash_cfg {
 	struct afu *afu;
 
+	const struct cxlflash_backend_ops *ops;
 	struct pci_dev *dev;
 	struct pci_device_id *dev_id;
 	struct Scsi_Host *host;
diff --git a/drivers/scsi/cxlflash/cxl_hw.c b/drivers/scsi/cxlflash/cxl_hw.c
new file mode 100644
index 000000000000..db1cadad5c5d
--- /dev/null
+++ b/drivers/scsi/cxlflash/cxl_hw.c
@@ -0,0 +1,168 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2018 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <misc/cxl.h>
+
+#include "backend.h"
+
+/*
+ * The following routines map the cxlflash backend operations to existing CXL
+ * kernel API function and are largely simple shims that provide an abstraction
+ * for converting generic context and AFU cookies into cxl_context or cxl_afu
+ * pointers.
+ */
+
+static void __iomem *cxlflash_psa_map(void *ctx_cookie)
+{
+	return cxl_psa_map(ctx_cookie);
+}
+
+static void cxlflash_psa_unmap(void __iomem *addr)
+{
+	cxl_psa_unmap(addr);
+}
+
+static int cxlflash_process_element(void *ctx_cookie)
+{
+	return cxl_process_element(ctx_cookie);
+}
+
+static int cxlflash_map_afu_irq(void *ctx_cookie, int num,
+				irq_handler_t handler, void *cookie, char *name)
+{
+	return cxl_map_afu_irq(ctx_cookie, num, handler, cookie, name);
+}
+
+static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie)
+{
+	cxl_unmap_afu_irq(ctx_cookie, num, cookie);
+}
+
+static int cxlflash_start_context(void *ctx_cookie)
+{
+	return cxl_start_context(ctx_cookie, 0, NULL);
+}
+
+static int cxlflash_stop_context(void *ctx_cookie)
+{
+	return cxl_stop_context(ctx_cookie);
+}
+
+static int cxlflash_afu_reset(void *ctx_cookie)
+{
+	return cxl_afu_reset(ctx_cookie);
+}
+
+static void cxlflash_set_master(void *ctx_cookie)
+{
+	cxl_set_master(ctx_cookie);
+}
+
+static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie)
+{
+	return cxl_get_context(dev);
+}
+
+static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie)
+{
+	return cxl_dev_context_init(dev);
+}
+
+static int cxlflash_release_context(void *ctx_cookie)
+{
+	return cxl_release_context(ctx_cookie);
+}
+
+static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
+{
+	cxl_perst_reloads_same_image(afu_cookie, image);
+}
+
+static ssize_t cxlflash_read_adapter_vpd(struct pci_dev *dev,
+					 void *buf, size_t count)
+{
+	return cxl_read_adapter_vpd(dev, buf, count);
+}
+
+static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
+{
+	return cxl_allocate_afu_irqs(ctx_cookie, num);
+}
+
+static void cxlflash_free_afu_irqs(void *ctx_cookie)
+{
+	cxl_free_afu_irqs(ctx_cookie);
+}
+
+static void *cxlflash_create_afu(struct pci_dev *dev)
+{
+	return cxl_pci_to_afu(dev);
+}
+
+static struct file *cxlflash_get_fd(void *ctx_cookie,
+				    struct file_operations *fops, int *fd)
+{
+	return cxl_get_fd(ctx_cookie, fops, fd);
+}
+
+static void *cxlflash_fops_get_context(struct file *file)
+{
+	return cxl_fops_get_context(file);
+}
+
+static int cxlflash_start_work(void *ctx_cookie, u64 irqs)
+{
+	struct cxl_ioctl_start_work work = { 0 };
+
+	work.num_interrupts = irqs;
+	work.flags = CXL_START_WORK_NUM_IRQS;
+
+	return cxl_start_work(ctx_cookie, &work);
+}
+
+static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm)
+{
+	return cxl_fd_mmap(file, vm);
+}
+
+static int cxlflash_fd_release(struct inode *inode, struct file *file)
+{
+	return cxl_fd_release(inode, file);
+}
+
+const struct cxlflash_backend_ops cxlflash_cxl_ops = {
+	.module			= THIS_MODULE,
+	.psa_map		= cxlflash_psa_map,
+	.psa_unmap		= cxlflash_psa_unmap,
+	.process_element	= cxlflash_process_element,
+	.map_afu_irq		= cxlflash_map_afu_irq,
+	.unmap_afu_irq		= cxlflash_unmap_afu_irq,
+	.start_context		= cxlflash_start_context,
+	.stop_context		= cxlflash_stop_context,
+	.afu_reset		= cxlflash_afu_reset,
+	.set_master		= cxlflash_set_master,
+	.get_context		= cxlflash_get_context,
+	.dev_context_init	= cxlflash_dev_context_init,
+	.release_context	= cxlflash_release_context,
+	.perst_reloads_same_image = cxlflash_perst_reloads_same_image,
+	.read_adapter_vpd	= cxlflash_read_adapter_vpd,
+	.allocate_afu_irqs	= cxlflash_allocate_afu_irqs,
+	.free_afu_irqs		= cxlflash_free_afu_irqs,
+	.create_afu		= cxlflash_create_afu,
+	.get_fd			= cxlflash_get_fd,
+	.fops_get_context	= cxlflash_fops_get_context,
+	.start_work		= cxlflash_start_work,
+	.fd_mmap		= cxlflash_fd_mmap,
+	.fd_release		= cxlflash_fd_release,
+};
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 32014e88cdb1..d8fe7ab870b8 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -711,7 +711,7 @@ static void stop_afu(struct cxlflash_cfg *cfg)
 		}
 
 		if (likely(afu->afu_map)) {
-			cxl_psa_unmap((void __iomem *)afu->afu_map);
+			cfg->ops->psa_unmap(afu->afu_map);
 			afu->afu_map = NULL;
 		}
 	}
@@ -748,13 +748,13 @@ static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level,
 	case UNMAP_THREE:
 		/* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
 		if (index == PRIMARY_HWQ)
-			cxl_unmap_afu_irq(hwq->ctx_cookie, 3, hwq);
+			cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 3, hwq);
 	case UNMAP_TWO:
-		cxl_unmap_afu_irq(hwq->ctx_cookie, 2, hwq);
+		cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 2, hwq);
 	case UNMAP_ONE:
-		cxl_unmap_afu_irq(hwq->ctx_cookie, 1, hwq);
+		cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 1, hwq);
 	case FREE_IRQ:
-		cxl_free_afu_irqs(hwq->ctx_cookie);
+		cfg->ops->free_afu_irqs(hwq->ctx_cookie);
 		/* fall through */
 	case UNDO_NOOP:
 		/* No action required */
@@ -788,9 +788,9 @@ static void term_mc(struct cxlflash_cfg *cfg, u32 index)
 		return;
 	}
 
-	WARN_ON(cxl_stop_context(hwq->ctx_cookie));
+	WARN_ON(cfg->ops->stop_context(hwq->ctx_cookie));
 	if (index != PRIMARY_HWQ)
-		WARN_ON(cxl_release_context(hwq->ctx_cookie));
+		WARN_ON(cfg->ops->release_context(hwq->ctx_cookie));
 	hwq->ctx_cookie = NULL;
 
 	spin_lock_irqsave(&hwq->hsq_slock, lock_flags);
@@ -1599,25 +1599,6 @@ out:
 }
 
 /**
- * start_context() - starts the master context
- * @cfg:	Internal structure associated with the host.
- * @index:	Index of the hardware queue.
- *
- * Return: A success or failure value from CXL services.
- */
-static int start_context(struct cxlflash_cfg *cfg, u32 index)
-{
-	struct device *dev = &cfg->dev->dev;
-	struct hwq *hwq = get_hwq(cfg->afu, index);
-	int rc = 0;
-
-	rc = cxl_start_context(hwq->ctx_cookie, 0, NULL);
-
-	dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
-	return rc;
-}
-
-/**
  * read_vpd() - obtains the WWPNs from VPD
  * @cfg:	Internal structure associated with the host.
  * @wwpn:	Array of size MAX_FC_PORTS to pass back WWPNs
@@ -1639,7 +1620,7 @@ static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
 	const char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" };
 
 	/* Get the VPD data from the device */
-	vpd_size = cxl_read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data));
+	vpd_size = cfg->ops->read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data));
 	if (unlikely(vpd_size <= 0)) {
 		dev_err(dev, "%s: Unable to read VPD (size = %ld)\n",
 			__func__, vpd_size);
@@ -1731,6 +1712,7 @@ static void init_pcr(struct cxlflash_cfg *cfg)
 	struct afu *afu = cfg->afu;
 	struct sisl_ctrl_map __iomem *ctrl_map;
 	struct hwq *hwq;
+	void *cookie;
 	int i;
 
 	for (i = 0; i < MAX_CONTEXT; i++) {
@@ -1745,8 +1727,9 @@ static void init_pcr(struct cxlflash_cfg *cfg)
 	/* Copy frequently used fields into hwq */
 	for (i = 0; i < afu->num_hwqs; i++) {
 		hwq = get_hwq(afu, i);
+		cookie = hwq->ctx_cookie;
 
-		hwq->ctx_hndl = (u16) cxl_process_element(hwq->ctx_cookie);
+		hwq->ctx_hndl = (u16) cfg->ops->process_element(cookie);
 		hwq->host_map = &afu->afu_map->hosts[hwq->ctx_hndl].host;
 		hwq->ctrl_map = &afu->afu_map->ctrls[hwq->ctx_hndl].ctrl;
 
@@ -1930,7 +1913,7 @@ static enum undo_level init_intr(struct cxlflash_cfg *cfg,
 	bool is_primary_hwq = (hwq->index == PRIMARY_HWQ);
 	int num_irqs = is_primary_hwq ? 3 : 2;
 
-	rc = cxl_allocate_afu_irqs(ctx, num_irqs);
+	rc = cfg->ops->allocate_afu_irqs(ctx, num_irqs);
 	if (unlikely(rc)) {
 		dev_err(dev, "%s: allocate_afu_irqs failed rc=%d\n",
 			__func__, rc);
@@ -1938,16 +1921,16 @@ static enum undo_level init_intr(struct cxlflash_cfg *cfg,
 		goto out;
 	}
 
-	rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, hwq,
-			     "SISL_MSI_SYNC_ERROR");
+	rc = cfg->ops->map_afu_irq(ctx, 1, cxlflash_sync_err_irq, hwq,
+				   "SISL_MSI_SYNC_ERROR");
 	if (unlikely(rc <= 0)) {
 		dev_err(dev, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__);
 		level = FREE_IRQ;
 		goto out;
 	}
 
-	rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, hwq,
-			     "SISL_MSI_RRQ_UPDATED");
+	rc = cfg->ops->map_afu_irq(ctx, 2, cxlflash_rrq_irq, hwq,
+				   "SISL_MSI_RRQ_UPDATED");
 	if (unlikely(rc <= 0)) {
 		dev_err(dev, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__);
 		level = UNMAP_ONE;
@@ -1958,8 +1941,8 @@ static enum undo_level init_intr(struct cxlflash_cfg *cfg,
 	if (!is_primary_hwq)
 		goto out;
 
-	rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, hwq,
-			     "SISL_MSI_ASYNC_ERROR");
+	rc = cfg->ops->map_afu_irq(ctx, 3, cxlflash_async_err_irq, hwq,
+				   "SISL_MSI_ASYNC_ERROR");
 	if (unlikely(rc <= 0)) {
 		dev_err(dev, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__);
 		level = UNMAP_TWO;
@@ -1989,9 +1972,9 @@ static int init_mc(struct cxlflash_cfg *cfg, u32 index)
 	INIT_LIST_HEAD(&hwq->pending_cmds);
 
 	if (index == PRIMARY_HWQ)
-		ctx = cxl_get_context(cfg->dev);
+		ctx = cfg->ops->get_context(cfg->dev, cfg->afu_cookie);
 	else
-		ctx = cxl_dev_context_init(cfg->dev);
+		ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie);
 	if (IS_ERR_OR_NULL(ctx)) {
 		rc = -ENOMEM;
 		goto err1;
@@ -2001,11 +1984,11 @@ static int init_mc(struct cxlflash_cfg *cfg, u32 index)
 	hwq->ctx_cookie = ctx;
 
 	/* Set it up as a master with the CXL */
-	cxl_set_master(ctx);
+	cfg->ops->set_master(ctx);
 
 	/* Reset AFU when initializing primary context */
 	if (index == PRIMARY_HWQ) {
-		rc = cxl_afu_reset(ctx);
+		rc = cfg->ops->afu_reset(ctx);
 		if (unlikely(rc)) {
 			dev_err(dev, "%s: AFU reset failed rc=%d\n",
 				      __func__, rc);
@@ -2019,11 +2002,8 @@ static int init_mc(struct cxlflash_cfg *cfg, u32 index)
 		goto err2;
 	}
 
-	/* This performs the equivalent of the CXL_IOCTL_START_WORK.
-	 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process
-	 * element (pe) that is embedded in the context (ctx)
-	 */
-	rc = start_context(cfg, index);
+	/* Finally, activate the context by starting it */
+	rc = cfg->ops->start_context(hwq->ctx_cookie);
 	if (unlikely(rc)) {
 		dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc);
 		level = UNMAP_THREE;
@@ -2036,7 +2016,7 @@ out:
 err2:
 	term_intr(cfg, level, index);
 	if (index != PRIMARY_HWQ)
-		cxl_release_context(ctx);
+		cfg->ops->release_context(ctx);
 err1:
 	hwq->ctx_cookie = NULL;
 	goto out;
@@ -2093,7 +2073,7 @@ static int init_afu(struct cxlflash_cfg *cfg)
 	struct hwq *hwq;
 	int i;
 
-	cxl_perst_reloads_same_image(cfg->afu_cookie, true);
+	cfg->ops->perst_reloads_same_image(cfg->afu_cookie, true);
 
 	afu->num_hwqs = afu->desired_hwqs;
 	for (i = 0; i < afu->num_hwqs; i++) {
@@ -2107,9 +2087,9 @@ static int init_afu(struct cxlflash_cfg *cfg)
 
 	/* Map the entire MMIO space of the AFU using the first context */
 	hwq = get_hwq(afu, PRIMARY_HWQ);
-	afu->afu_map = cxl_psa_map(hwq->ctx_cookie);
+	afu->afu_map = cfg->ops->psa_map(hwq->ctx_cookie);
 	if (!afu->afu_map) {
-		dev_err(dev, "%s: cxl_psa_map failed\n", __func__);
+		dev_err(dev, "%s: psa_map failed\n", __func__);
 		rc = -ENOMEM;
 		goto err1;
 	}
@@ -3669,6 +3649,7 @@ static int cxlflash_probe(struct pci_dev *pdev,
 
 	cfg->init_state = INIT_STATE_NONE;
 	cfg->dev = pdev;
+	cfg->ops = &cxlflash_cxl_ops;
 	cfg->cxl_fops = cxlflash_cxl_fops;
 
 	/*
@@ -3700,7 +3681,7 @@ static int cxlflash_probe(struct pci_dev *pdev,
 
 	pci_set_drvdata(pdev, cfg);
 
-	cfg->afu_cookie = cxl_pci_to_afu(pdev);
+	cfg->afu_cookie = cfg->ops->create_afu(pdev);
 
 	rc = init_pci(cfg);
 	if (rc) {
diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c
index 51f67dcca90a..2fe79df5c73c 100644
--- a/drivers/scsi/cxlflash/superpipe.c
+++ b/drivers/scsi/cxlflash/superpipe.c
@@ -978,9 +978,9 @@ static int cxlflash_disk_detach(struct scsi_device *sdev,
  */
 static int cxlflash_cxl_release(struct inode *inode, struct file *file)
 {
-	void *ctx = cxl_fops_get_context(file);
 	struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
 						cxl_fops);
+	void *ctx = cfg->ops->fops_get_context(file);
 	struct device *dev = &cfg->dev->dev;
 	struct ctx_info *ctxi = NULL;
 	struct dk_cxlflash_detach detach = { { 0 }, 0 };
@@ -988,7 +988,7 @@ static int cxlflash_cxl_release(struct inode *inode, struct file *file)
 	enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE;
 	int ctxid;
 
-	ctxid = cxl_process_element(ctx);
+	ctxid = cfg->ops->process_element(ctx);
 	if (unlikely(ctxid < 0)) {
 		dev_err(dev, "%s: Context %p was closed ctxid=%d\n",
 			__func__, ctx, ctxid);
@@ -1016,7 +1016,7 @@ static int cxlflash_cxl_release(struct inode *inode, struct file *file)
 	list_for_each_entry_safe(lun_access, t, &ctxi->luns, list)
 		_cxlflash_disk_detach(lun_access->sdev, ctxi, &detach);
 out_release:
-	cxl_fd_release(inode, file);
+	cfg->ops->fd_release(inode, file);
 out:
 	dev_dbg(dev, "%s: returning\n", __func__);
 	return 0;
@@ -1091,9 +1091,9 @@ static int cxlflash_mmap_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct file *file = vma->vm_file;
-	void *ctx = cxl_fops_get_context(file);
 	struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
 						cxl_fops);
+	void *ctx = cfg->ops->fops_get_context(file);
 	struct device *dev = &cfg->dev->dev;
 	struct ctx_info *ctxi = NULL;
 	struct page *err_page = NULL;
@@ -1101,7 +1101,7 @@ static int cxlflash_mmap_fault(struct vm_fault *vmf)
 	int rc = 0;
 	int ctxid;
 
-	ctxid = cxl_process_element(ctx);
+	ctxid = cfg->ops->process_element(ctx);
 	if (unlikely(ctxid < 0)) {
 		dev_err(dev, "%s: Context %p was closed ctxid=%d\n",
 			__func__, ctx, ctxid);
@@ -1164,16 +1164,16 @@ static const struct vm_operations_struct cxlflash_mmap_vmops = {
  */
 static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	void *ctx = cxl_fops_get_context(file);
 	struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
 						cxl_fops);
+	void *ctx = cfg->ops->fops_get_context(file);
 	struct device *dev = &cfg->dev->dev;
 	struct ctx_info *ctxi = NULL;
 	enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE;
 	int ctxid;
 	int rc = 0;
 
-	ctxid = cxl_process_element(ctx);
+	ctxid = cfg->ops->process_element(ctx);
 	if (unlikely(ctxid < 0)) {
 		dev_err(dev, "%s: Context %p was closed ctxid=%d\n",
 			__func__, ctx, ctxid);
@@ -1190,7 +1190,7 @@ static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma)
 
 	dev_dbg(dev, "%s: mmap for context %d\n", __func__, ctxid);
 
-	rc = cxl_fd_mmap(file, vma);
+	rc = cfg->ops->fd_mmap(file, vma);
 	if (likely(!rc)) {
 		/* Insert ourself in the mmap fault handler path */
 		ctxi->cxl_mmap_vmops = vma->vm_ops;
@@ -1309,7 +1309,6 @@ static int cxlflash_disk_attach(struct scsi_device *sdev,
 	struct afu *afu = cfg->afu;
 	struct llun_info *lli = sdev->hostdata;
 	struct glun_info *gli = lli->parent;
-	struct cxl_ioctl_start_work work = { 0 };
 	struct ctx_info *ctxi = NULL;
 	struct lun_access *lun_access = NULL;
 	int rc = 0;
@@ -1397,7 +1396,7 @@ static int cxlflash_disk_attach(struct scsi_device *sdev,
 		goto err;
 	}
 
-	ctx = cxl_dev_context_init(cfg->dev);
+	ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie);
 	if (IS_ERR_OR_NULL(ctx)) {
 		dev_err(dev, "%s: Could not initialize context %p\n",
 			__func__, ctx);
@@ -1405,24 +1404,21 @@ static int cxlflash_disk_attach(struct scsi_device *sdev,
 		goto err;
 	}
 
-	work.num_interrupts = irqs;
-	work.flags = CXL_START_WORK_NUM_IRQS;
-
-	rc = cxl_start_work(ctx, &work);
+	rc = cfg->ops->start_work(ctx, irqs);
 	if (unlikely(rc)) {
 		dev_dbg(dev, "%s: Could not start context rc=%d\n",
 			__func__, rc);
 		goto err;
 	}
 
-	ctxid = cxl_process_element(ctx);
+	ctxid = cfg->ops->process_element(ctx);
 	if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) {
 		dev_err(dev, "%s: ctxid=%d invalid\n", __func__, ctxid);
 		rc = -EPERM;
 		goto err;
 	}
 
-	file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd);
+	file = cfg->ops->get_fd(ctx, &cfg->cxl_fops, &fd);
 	if (unlikely(fd < 0)) {
 		rc = -ENODEV;
 		dev_err(dev, "%s: Could not get file descriptor\n", __func__);
@@ -1481,8 +1477,8 @@ out:
 err:
 	/* Cleanup CXL context; okay to 'stop' even if it was not started */
 	if (!IS_ERR_OR_NULL(ctx)) {
-		cxl_stop_context(ctx);
-		cxl_release_context(ctx);
+		cfg->ops->stop_context(ctx);
+		cfg->ops->release_context(ctx);
 		ctx = NULL;
 	}
 
@@ -1533,9 +1529,8 @@ static int recover_context(struct cxlflash_cfg *cfg,
 	struct file *file;
 	void *ctx;
 	struct afu *afu = cfg->afu;
-	struct cxl_ioctl_start_work work = { 0 };
 
-	ctx = cxl_dev_context_init(cfg->dev);
+	ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie);
 	if (IS_ERR_OR_NULL(ctx)) {
 		dev_err(dev, "%s: Could not initialize context %p\n",
 			__func__, ctx);
@@ -1543,24 +1538,21 @@ static int recover_context(struct cxlflash_cfg *cfg,
 		goto out;
 	}
 
-	work.num_interrupts = ctxi->irqs;
-	work.flags = CXL_START_WORK_NUM_IRQS;
-
-	rc = cxl_start_work(ctx, &work);
+	rc = cfg->ops->start_work(ctx, ctxi->irqs);
 	if (unlikely(rc)) {
 		dev_dbg(dev, "%s: Could not start context rc=%d\n",
 			__func__, rc);
 		goto err1;
 	}
 
-	ctxid = cxl_process_element(ctx);
+	ctxid = cfg->ops->process_element(ctx);
 	if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) {
 		dev_err(dev, "%s: ctxid=%d invalid\n", __func__, ctxid);
 		rc = -EPERM;
 		goto err2;
 	}
 
-	file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd);
+	file = cfg->ops->get_fd(ctx, &cfg->cxl_fops, &fd);
 	if (unlikely(fd < 0)) {
 		rc = -ENODEV;
 		dev_err(dev, "%s: Could not get file descriptor\n", __func__);
@@ -1607,9 +1599,9 @@ err3:
 	fput(file);
 	put_unused_fd(fd);
 err2:
-	cxl_stop_context(ctx);
+	cfg->ops->stop_context(ctx);
 err1:
-	cxl_release_context(ctx);
+	cfg->ops->release_context(ctx);
 	goto out;
 }