Add new allocation functions which can be activated by domain info
flags. They store the groups pointer in struct msi_device_data.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
include/linux/msi.h | 12 +++++++++++-
kernel/irq/msi.c | 42 ++++++++++++++++++++++++++++++++++++++++--
2 files changed, 51 insertions(+), 3 deletions(-)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -174,9 +174,11 @@ struct msi_desc {
/**
* msi_device_data - MSI per device data
* @lock: Spinlock to protect register access
+ * @attrs: Pointer to the sysfs attribute group
*/
struct msi_device_data {
- raw_spinlock_t lock;
+ raw_spinlock_t lock;
+ const struct attribute_group **attrs;
};
int msi_setup_device_data(struct device *dev);
@@ -242,10 +244,16 @@ void pci_msi_mask_irq(struct irq_data *d
void pci_msi_unmask_irq(struct irq_data *data);
#ifdef CONFIG_SYSFS
+int msi_device_populate_sysfs(struct device *dev);
+void msi_device_destroy_sysfs(struct device *dev);
+
const struct attribute_group **msi_populate_sysfs(struct device *dev);
void msi_destroy_sysfs(struct device *dev,
const struct attribute_group **msi_irq_groups);
#else
+static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
+static inline void msi_device_destroy_sysfs(struct device *dev) { }
+
static inline const struct attribute_group **msi_populate_sysfs(struct device
*dev)
{
return NULL;
@@ -393,6 +401,8 @@ enum {
MSI_FLAG_MUST_REACTIVATE = (1 << 5),
/* Is level-triggered capable, using two messages */
MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
+ /* Populate sysfs on alloc() and destroy it on free() */
+ MSI_FLAG_DEV_SYSFS = (1 << 7),
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -214,6 +214,20 @@ const struct attribute_group **msi_popul
}
/**
+ * msi_device_populate_sysfs - Populate msi_irqs sysfs entries for a device
+ * @dev: The device(PCI, platform etc) which will get sysfs entries
+ */
+int msi_device_populate_sysfs(struct device *dev)
+{
+ const struct attribute_group **group = msi_populate_sysfs(dev);
+
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+ dev->msi.data->attrs = group;
+ return 0;
+}
+
+/**
* 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
@@ -239,6 +253,17 @@ void msi_destroy_sysfs(struct device *de
kfree(msi_irq_groups);
}
}
+
+/**
+ * msi_device_destroy_sysfs - Destroy msi_irqs sysfs entries for a device
+ * @dev: The device(PCI, platform etc) for which to remove
+ * sysfs entries
+ */
+void msi_device_destroy_sysfs(struct device *dev)
+{
+ msi_destroy_sysfs(dev, dev->msi.data->attrs);
+ dev->msi.data->attrs = NULL;
+}
#endif
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
@@ -686,8 +711,19 @@ int msi_domain_alloc_irqs(struct irq_dom
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
+ int ret;
- return ops->domain_alloc_irqs(domain, dev, nvec);
+ ret = ops->domain_alloc_irqs(domain, dev, nvec);
+ if (ret)
+ return ret;
+
+ if (!(info->flags & MSI_FLAG_DEV_SYSFS))
+ return 0;
+
+ ret = msi_device_populate_sysfs(dev);
+ if (ret)
+ msi_domain_free_irqs(domain, dev);
+ return ret;
}
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
@@ -726,7 +762,9 @@ void msi_domain_free_irqs(struct irq_dom
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
- return ops->domain_free_irqs(domain, dev);
+ if (info->flags & MSI_FLAG_DEV_SYSFS)
+ msi_device_destroy_sysfs(dev);
+ ops->domain_free_irqs(domain, dev);
}
/**
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