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| author | Robin Murphy <robin.murphy@arm.com> | 2021-08-11 15:21:30 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-08-18 14:27:49 +0300 |
| commit | bf3aed4660c6e3c44c69f07d8927ee5a22a952ac (patch) | |
| tree | d85dbe18b0004a7359904f61342e81aebf40abcd /include/linux/iommu.h | |
| parent | a8e5f04458c4e496eada2b029ce96713bb6c388d (diff) | |
| download | linux-bf3aed4660c6e3c44c69f07d8927ee5a22a952ac.tar.xz | |
iommu: Introduce explicit type for non-strict DMA domains
Promote the difference between strict and non-strict DMA domains from an
internal detail to a distinct domain feature and type, to pave the road
for exposing it through the sysfs default domain interface.
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/08cd2afaf6b63c58ad49acec3517c9b32c2bb946.1628682049.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index f7679f6684b1..5629ae42951f 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -61,6 +61,7 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API implementation */ #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ +#define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */ /* * This are the possible domain-types @@ -73,12 +74,17 @@ struct iommu_domain_geometry { * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. * This flag allows IOMMU drivers to implement * certain optimizations for these domains + * IOMMU_DOMAIN_DMA_FQ - As above, but definitely using batched TLB + * invalidation. */ #define IOMMU_DOMAIN_BLOCKED (0U) #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ __IOMMU_DOMAIN_DMA_API) +#define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \ + __IOMMU_DOMAIN_DMA_API | \ + __IOMMU_DOMAIN_DMA_FQ) struct iommu_domain { unsigned type; @@ -90,6 +96,11 @@ struct iommu_domain { struct iommu_dma_cookie *iova_cookie; }; +static inline bool iommu_is_dma_domain(struct iommu_domain *domain) +{ + return domain->type & __IOMMU_DOMAIN_DMA_API; +} + enum iommu_cap { IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA transactions */ |