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genirq/msi: Add mutex for MSI list protection

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For upcoming runtime extensions of MSI-X interrupts it's required to
protect the MSI descriptor list. Add a mutex to struct msi_device_data and
provide lock/unlock functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210747.708877269@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:51:05 +01:00
parent 125282cd4f
commit b5f687f97d
2 changed files with 26 additions and 0 deletions
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5
include/linux/msi.h
View file

@ -3,6 +3,7 @@
#define LINUX_MSI_H
#include <linux/cpumask.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <asm/msi.h>
@ -145,17 +146,21 @@ struct msi_desc {
* @attrs: Pointer to the sysfs attribute group
* @platform_data: Platform-MSI specific data
* @list: List of MSI descriptors associated to the device
* @mutex: Mutex protecting the MSI list
*/
struct msi_device_data {
unsigned long properties;
const struct attribute_group **attrs;
struct platform_msi_priv_data *platform_data;
struct list_head list;
struct mutex mutex;
};
int msi_setup_device_data(struct device *dev);
unsigned int msi_get_virq(struct device *dev, unsigned int index);
void msi_lock_descs(struct device *dev);
void msi_unlock_descs(struct device *dev);
/* Helpers to hide struct msi_desc implementation details */
#define msi_desc_to_dev(desc) ((desc)->dev)

21
kernel/irq/msi.c
View file

@ -103,11 +103,32 @@ int msi_setup_device_data(struct device *dev)
return -ENOMEM;
INIT_LIST_HEAD(&md->list);
mutex_init(&md->mutex);
dev->msi.data = md;
devres_add(dev, md);
return 0;
}
/**
* msi_lock_descs - Lock the MSI descriptor storage of a device
* @dev: Device to operate on
*/
void msi_lock_descs(struct device *dev)
{
mutex_lock(&dev->msi.data->mutex);
}
EXPORT_SYMBOL_GPL(msi_lock_descs);
/**
* msi_unlock_descs - Unlock the MSI descriptor storage of a device
* @dev: Device to operate on
*/
void msi_unlock_descs(struct device *dev)
{
mutex_unlock(&dev->msi.data->mutex);
}
EXPORT_SYMBOL_GPL(msi_unlock_descs);
/**
* msi_get_virq - Return Linux interrupt number of a MSI interrupt
* @dev: Device to operate on