Merge tag 'irq-core-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq updates from Thomas Gleixner:
 "Updates to the interrupt core and driver subsystems:

  Core changes:

   - The usual set of small fixes and improvements all over the place,
     but nothing stands out

  MSI changes:

   - Further consolidation of the PCI/MSI interrupt chip code

   - Make MSI sysfs code independent of PCI/MSI and expose the MSI
     interrupts of platform devices in the same way as PCI exposes them.

  Driver changes:

   - Support for ARM GICv3 EPPI partitions

   - Treewide conversion to generic_handle_domain_irq() for all chained
     interrupt controllers

   - Conversion to bitmap_zalloc() throughout the irq chip drivers

   - The usual set of small fixes and improvements"

* tag 'irq-core-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (57 commits)
  platform-msi: Add ABI to show msi_irqs of platform devices
  genirq/msi: Move MSI sysfs handling from PCI to MSI core
  genirq/cpuhotplug: Demote debug printk to KERN_DEBUG
  irqchip/qcom-pdc: Trim unused levels of the interrupt hierarchy
  irqdomain: Export irq_domain_disconnect_hierarchy()
  irqchip/gic-v3: Fix priority comparison when non-secure priorities are used
  irqchip/apple-aic: Fix irq_disable from within irq handlers
  pinctrl/rockchip: drop the gpio related codes
  gpio/rockchip: drop irq_gc_lock/irq_gc_unlock for irq set type
  gpio/rockchip: support next version gpio controller
  gpio/rockchip: use struct rockchip_gpio_regs for gpio controller
  gpio/rockchip: add driver for rockchip gpio
  dt-bindings: gpio: change items restriction of clock for rockchip,gpio-bank
  pinctrl/rockchip: add pinctrl device to gpio bank struct
  pinctrl/rockchip: separate struct rockchip_pin_bank to a head file
  pinctrl/rockchip: always enable clock for gpio controller
  genirq: Fix kernel doc indentation
  EDAC/altera: Convert to generic_handle_domain_irq()
  powerpc: Bulk conversion to generic_handle_domain_irq()
  nios2: Bulk conversion to generic_handle_domain_irq()
  ...

1 files changed, 146 insertions, 7 deletions

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 85df3ca03efe..6a5ecee6e567 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -14,17 +14,20 @@
 #include <linux/irqdomain.h>
 #include <linux/msi.h>
 #include <linux/slab.h>
+#include <linux/pci.h>
 
 #include "internals.h"
 
 /**
- * alloc_msi_entry - Allocate an initialize msi_entry
+ * alloc_msi_entry - Allocate an initialized msi_desc
  * @dev:	Pointer to the device for which this is allocated
  * @nvec:	The number of vectors used in this entry
  * @affinity:	Optional pointer to an affinity mask array size of @nvec
  *
- * If @affinity is not NULL then an affinity array[@nvec] is allocated
+ * If @affinity is not %NULL then an affinity array[@nvec] is allocated
  * and the affinity masks and flags from @affinity are copied.
+ *
+ * Return: pointer to allocated &msi_desc on success or %NULL on failure
  */
 struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
 				 const struct irq_affinity_desc *affinity)
@@ -69,6 +72,139 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
 }
 EXPORT_SYMBOL_GPL(get_cached_msi_msg);
 
+static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct msi_desc *entry;
+	bool is_msix = false;
+	unsigned long irq;
+	int retval;
+
+	retval = kstrtoul(attr->attr.name, 10, &irq);
+	if (retval)
+		return retval;
+
+	entry = irq_get_msi_desc(irq);
+	if (!entry)
+		return -ENODEV;
+
+	if (dev_is_pci(dev))
+		is_msix = entry->msi_attrib.is_msix;
+
+	return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
+}
+
+/**
+ * msi_populate_sysfs - Populate msi_irqs sysfs entries for devices
+ * @dev:	The device(PCI, platform etc) who will get sysfs entries
+ *
+ * Return attribute_group ** so that specific bus MSI can save it to
+ * somewhere during initilizing msi irqs. If devices has no MSI irq,
+ * return NULL; if it fails to populate sysfs, return ERR_PTR
+ */
+const struct attribute_group **msi_populate_sysfs(struct device *dev)
+{
+	const struct attribute_group **msi_irq_groups;
+	struct attribute **msi_attrs, *msi_attr;
+	struct device_attribute *msi_dev_attr;
+	struct attribute_group *msi_irq_group;
+	struct msi_desc *entry;
+	int ret = -ENOMEM;
+	int num_msi = 0;
+	int count = 0;
+	int i;
+
+	/* Determine how many msi entries we have */
+	for_each_msi_entry(entry, dev)
+		num_msi += entry->nvec_used;
+	if (!num_msi)
+		return NULL;
+
+	/* Dynamically create the MSI attributes for the device */
+	msi_attrs = kcalloc(num_msi + 1, sizeof(void *), GFP_KERNEL);
+	if (!msi_attrs)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_msi_entry(entry, dev) {
+		for (i = 0; i < entry->nvec_used; i++) {
+			msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
+			if (!msi_dev_attr)
+				goto error_attrs;
+			msi_attrs[count] = &msi_dev_attr->attr;
+
+			sysfs_attr_init(&msi_dev_attr->attr);
+			msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
+							    entry->irq + i);
+			if (!msi_dev_attr->attr.name)
+				goto error_attrs;
+			msi_dev_attr->attr.mode = 0444;
+			msi_dev_attr->show = msi_mode_show;
+			++count;
+		}
+	}
+
+	msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
+	if (!msi_irq_group)
+		goto error_attrs;
+	msi_irq_group->name = "msi_irqs";
+	msi_irq_group->attrs = msi_attrs;
+
+	msi_irq_groups = kcalloc(2, sizeof(void *), GFP_KERNEL);
+	if (!msi_irq_groups)
+		goto error_irq_group;
+	msi_irq_groups[0] = msi_irq_group;
+
+	ret = sysfs_create_groups(&dev->kobj, msi_irq_groups);
+	if (ret)
+		goto error_irq_groups;
+
+	return msi_irq_groups;
+
+error_irq_groups:
+	kfree(msi_irq_groups);
+error_irq_group:
+	kfree(msi_irq_group);
+error_attrs:
+	count = 0;
+	msi_attr = msi_attrs[count];
+	while (msi_attr) {
+		msi_dev_attr = container_of(msi_attr, struct device_attribute, attr);
+		kfree(msi_attr->name);
+		kfree(msi_dev_attr);
+		++count;
+		msi_attr = msi_attrs[count];
+	}
+	kfree(msi_attrs);
+	return ERR_PTR(ret);
+}
+
+/**
+ * msi_destroy_sysfs - Destroy msi_irqs sysfs entries for devices
+ * @dev:		The device(PCI, platform etc) who will remove sysfs entries
+ * @msi_irq_groups:	attribute_group for device msi_irqs entries
+ */
+void msi_destroy_sysfs(struct device *dev, const struct attribute_group **msi_irq_groups)
+{
+	struct device_attribute *dev_attr;
+	struct attribute **msi_attrs;
+	int count = 0;
+
+	if (msi_irq_groups) {
+		sysfs_remove_groups(&dev->kobj, msi_irq_groups);
+		msi_attrs = msi_irq_groups[0]->attrs;
+		while (msi_attrs[count]) {
+			dev_attr = container_of(msi_attrs[count],
+					struct device_attribute, attr);
+			kfree(dev_attr->attr.name);
+			kfree(dev_attr);
+			++count;
+		}
+		kfree(msi_attrs);
+		kfree(msi_irq_groups[0]);
+		kfree(msi_irq_groups);
+	}
+}
+
 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 static inline void irq_chip_write_msi_msg(struct irq_data *data,
 					  struct msi_msg *msg)
@@ -97,6 +233,8 @@ static void msi_check_level(struct irq_domain *domain, struct msi_msg *msg)
  *
  * Intended to be used by MSI interrupt controllers which are
  * implemented with hierarchical domains.
+ *
+ * Return: IRQ_SET_MASK_* result code
  */
 int msi_domain_set_affinity(struct irq_data *irq_data,
 			    const struct cpumask *mask, bool force)
@@ -277,10 +415,12 @@ static void msi_domain_update_chip_ops(struct msi_domain_info *info)
 }
 
 /**
- * msi_create_irq_domain - Create a MSI interrupt domain
+ * msi_create_irq_domain - Create an MSI interrupt domain
  * @fwnode:	Optional fwnode of the interrupt controller
  * @info:	MSI domain info
  * @parent:	Parent irq domain
+ *
+ * Return: pointer to the created &struct irq_domain or %NULL on failure
  */
 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
 					 struct msi_domain_info *info,
@@ -487,7 +627,7 @@ cleanup:
  *		are allocated
  * @nvec:	The number of interrupts to allocate
  *
- * Returns 0 on success or an error code.
+ * Return: %0 on success or an error code.
  */
 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 			  int nvec)
@@ -524,7 +664,7 @@ void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
 }
 
 /**
- * __msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev
+ * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated to @dev
  * @domain:	The domain to managing the interrupts
  * @dev:	Pointer to device struct of the device for which the interrupts
  *		are free
@@ -541,8 +681,7 @@ void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
  * msi_get_domain_info - Get the MSI interrupt domain info for @domain
  * @domain:	The interrupt domain to retrieve data from
  *
- * Returns the pointer to the msi_domain_info stored in
- * @domain->host_data.
+ * Return: the pointer to the msi_domain_info stored in @domain->host_data.
  */
 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
 {