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| author | Jason Gunthorpe <jgg@nvidia.com> | 2026-05-08 17:53:02 +0300 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2026-05-19 11:45:38 +0300 |
| commit | 89792629d4b260104555f9719ac84c1afc9a2012 (patch) | |
| tree | 10931977863446d5fa10fd9ad5c4a24bb1d2a3a9 /include/linux | |
| parent | f0e4b7f5f87578cdd2d0f1e866183adc10d33b85 (diff) | |
| download | linux-89792629d4b260104555f9719ac84c1afc9a2012.tar.xz | |
iommupt: Add PT_FEAT_DETAILED_GATHER
Generating the ARM SMMUv3 and RISC-V invalidation commands optimally
requires some additional details from iommupt:
- leaf_levels_bitmap is used to compute the ARM Range Invalidation
Table Top Level hint
- leaf_levels_bitmap is also used to compute the stride when
generating single invalidations to invalidate once per leaf
- table_levels_bitmap also computes the ARM TTL for future cases when
there are no leaves
Put these under a feature since only two drivers need to calculate
them.
This is also useful for the coming kunit iotlb invalidation test to
know more about what invalidation is happening.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Tested-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/generic_pt/common.h | 5 | ||||
| -rw-r--r-- | include/linux/iommu.h | 30 |
2 files changed, 30 insertions, 5 deletions
diff --git a/include/linux/generic_pt/common.h b/include/linux/generic_pt/common.h index 2683e5b38998..07ef1c8341a4 100644 --- a/include/linux/generic_pt/common.h +++ b/include/linux/generic_pt/common.h @@ -134,6 +134,11 @@ enum pt_features { * significant amount of page table. */ PT_FEAT_FLUSH_RANGE_NO_GAPS, + /** + * @PT_FEAT_DETAILED_GATHER: Fill in the struct iommu_iotlb_gather pt + * sub structure with information about which levels were changed. + */ + PT_FEAT_DETAILED_GATHER, /* private: */ PT_FEAT_FMT_START, }; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index a9e89911c90f..bf8a77a164e4 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -360,11 +360,31 @@ struct iommu_iotlb_gather { * flushed (inclusive) */ unsigned long end; - /** - * @pgsize: The interval at which to perform the flush, only used - * by arm-smmu-v3 - */ - size_t pgsize; + + union { + /** + * @pgsize: The interval at which to perform the flush, only + * used by arm-smmu-v3 + */ + size_t pgsize; + struct { + /** + * @pt.leaf_levels_bitmap: Bitmap of generic_pt + * levels where leaf entries were unmapped. Bit 0 + * means the leaf only level. If 0 no leafs + * were unmapped. + */ + u8 leaf_levels_bitmap; + /** + * @pt.table_levels_bitmap: Bitmap of generic_pt levels + * of table entries that were removed. Bit 0 is never + * set, bit 1 means a table of all leafs was removed. + * When freelist is empty this must be 0. + */ + u8 table_levels_bitmap; + } pt; + }; + /** * @freelist: Removed pages to free after sync, only used by * iommupt |