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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2024-06-10 16:55:35 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-07-04 14:09:33 +0100 |
| commit | a27bf2743cb80d3b36b5b43e8e2e702412c41668 (patch) | |
| tree | 017a3ae1c037934bf34e662f53fcb30988999bb2 /include/linux/iommu.h | |
| parent | 83a7eefedc9b56fe7bfeff13b6c7356688ffa670 (diff) | |
| download | linux-stable-a27bf2743cb80d3b36b5b43e8e2e702412c41668.tar.gz linux-stable-a27bf2743cb80d3b36b5b43e8e2e702412c41668.tar.bz2 linux-stable-a27bf2743cb80d3b36b5b43e8e2e702412c41668.zip | |
iommu: Add iommu_paging_domain_alloc() interface
Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from
bus. The iommu subsystem no longer relies on bus for operations. So the
bus parameter in iommu_domain_alloc() is no longer relevant.
Add a new interface named iommu_paging_domain_alloc(), which explicitly
indicates the allocation of a paging domain for DMA managed by a kernel
driver. The new interface takes a device pointer as its parameter, that
better aligns with the current iommu subsystem.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20240610085555.88197-2-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 17b3f36ad843..58ea0935d355 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -780,6 +780,7 @@ extern bool iommu_present(const struct bus_type *bus); extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap); extern bool iommu_group_has_isolated_msi(struct iommu_group *group); extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus); +struct iommu_domain *iommu_paging_domain_alloc(struct device *dev); extern void iommu_domain_free(struct iommu_domain *domain); extern int iommu_attach_device(struct iommu_domain *domain, struct device *dev); @@ -1086,6 +1087,11 @@ static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus return NULL; } +static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev) +{ + return ERR_PTR(-ENODEV); +} + static inline void iommu_domain_free(struct iommu_domain *domain) { } |