mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-09 17:17:04 -04:00
Code Issues Packages Projects Releases Wiki Activity

iommu: Introduce iommu_group_mutex_assert()

Browse Source 
Add function to check iommu group mutex lock. So that device drivers can
rely on group mutex lock instead of adding another driver level lock
before modifying driver specific device data structure.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240205115615.6053-10-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde
2024-02-05 11:56:07 +00:00
committed by Joerg Roedel
parent b2e8a7f5d2
commit bf8aff2945
2 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/iommu/iommu.c
View File

@@ -1248,6 +1248,25 @@ void iommu_group_remove_device(struct device *dev)
}
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
#if IS_ENABLED(CONFIG_LOCKDEP) && IS_ENABLED(CONFIG_IOMMU_API)
/**
* iommu_group_mutex_assert - Check device group mutex lock
* @dev: the device that has group param set
*
* This function is called by an iommu driver to check whether it holds
* group mutex lock for the given device or not.
*
* Note that this function must be called after device group param is set.
*/
void iommu_group_mutex_assert(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
lockdep_assert_held(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_group_mutex_assert);
#endif
static struct device *iommu_group_first_dev(struct iommu_group *group)
{
lockdep_assert_held(&group->mutex);

8
include/linux/iommu.h
View File

@@ -1356,6 +1356,14 @@ static inline ioasid_t iommu_alloc_global_pasid(struct device *dev)
static inline void iommu_free_global_pasid(ioasid_t pasid) {}
#endif /* CONFIG_IOMMU_API */
#if IS_ENABLED(CONFIG_LOCKDEP) && IS_ENABLED(CONFIG_IOMMU_API)
void iommu_group_mutex_assert(struct device *dev);
#else
static inline void iommu_group_mutex_assert(struct device *dev)
{
}
#endif
/**
* iommu_map_sgtable - Map the given buffer to the IOMMU domain
* @domain: The IOMMU domain to perform the mapping