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| author | Nicolin Chen <nicolinc@nvidia.com> | 2025-12-16 00:42:18 +0300 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-01-10 12:26:43 +0300 |
| commit | a75b2be249d60eff6015737f6c3e94935b541068 (patch) | |
| tree | 9cf2dcad94283db8e957773231e00aba7351b4a5 /include/linux | |
| parent | 4a73abb965b7546864957d2bde428f1e72bc3bb5 (diff) | |
| download | linux-a75b2be249d60eff6015737f6c3e94935b541068.tar.xz | |
iommu: Add iommu_driver_get_domain_for_dev() helper
There is a need to stage a resetting PCI device to temporarily the blocked
domain and then attach back to its previously attached domain after reset.
This can be simply done by keeping the "previously attached domain" in the
iommu_group->domain pointer while adding an iommu_group->resetting_domain,
which gives troubles to IOMMU drivers using the iommu_get_domain_for_dev()
for a device's physical domain in order to program IOMMU hardware.
And in such for-driver use cases, the iommu_group->mutex must be held, so
it doesn't fit in external callers that don't hold the iommu_group->mutex.
Introduce a new iommu_driver_get_domain_for_dev() helper, exclusively for
driver use cases that hold the iommu_group->mutex, to separate from those
external use cases.
Add a lockdep_assert_not_held to the existing iommu_get_domain_for_dev()
and highlight that in a kdoc.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/iommu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 8c66284a91a8..ff097df318b9 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -910,6 +910,7 @@ extern int iommu_attach_device(struct iommu_domain *domain, extern void iommu_detach_device(struct iommu_domain *domain, struct device *dev); extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); +struct iommu_domain *iommu_driver_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot, gfp_t gfp); |