Messages in this thread Patch in this message |  | | From | Lu Baolu <> | Subject | [PATCH RFC 02/11] iommu: Add iommu_domain type for SVA | Date | Sun, 20 Mar 2022 14:40:21 +0800 |
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Add a new iommu domain type IOMMU_DOMAIN_SVA to represent an I/O page table which is shared from CPU host VA. Add a sva_cookie field in the iommu_domain structure to save the mm_struct which represent the CPU memory page table.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- include/linux/iommu.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 36f43af0af53..3e179b853380 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -64,6 +64,9 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */ +#define __IOMMU_DOMAIN_SHARED (1U << 4) /* Page table shared from CPU */ +#define __IOMMU_DOMAIN_HOST_VA (1U << 5) /* Host CPU virtual address */ + /* * This are the possible domain-types * @@ -86,6 +89,8 @@ struct iommu_domain_geometry { #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \ __IOMMU_DOMAIN_DMA_API | \ __IOMMU_DOMAIN_DMA_FQ) +#define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SHARED | \ + __IOMMU_DOMAIN_HOST_VA) struct iommu_domain { unsigned type; @@ -95,6 +100,7 @@ struct iommu_domain { void *handler_token; struct iommu_domain_geometry geometry; struct iommu_dma_cookie *iova_cookie; + struct mm_struct *sva_cookie; }; static inline bool iommu_is_dma_domain(struct iommu_domain *domain) -- 2.25.1
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