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iommu/amd: Add helper function to check GIOSUP/GTSUP

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amd_iommu_gt_ppr_supported() only checks for GTSUP. To support PASID
with V2 page table we need GIOSUP as well. Hence add new helper function
to check GIOSUP/GTSUP.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20241028093810.5901-6-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde
2024-10-28 09:38:03 +00:00
committed by Joerg Roedel
parent 60c30aa6af
commit b0ffdb23e9
2 changed files with 7 additions and 3 deletions
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7
drivers/iommu/amd/amd_iommu.h
View File

@@ -118,9 +118,14 @@ static inline bool check_feature2(u64 mask)
return (amd_iommu_efr2 & mask);
}
static inline bool amd_iommu_v2_pgtbl_supported(void)
{
return (check_feature(FEATURE_GIOSUP) && check_feature(FEATURE_GT));
}
static inline bool amd_iommu_gt_ppr_supported(void)
{
return (check_feature(FEATURE_GT) &&
return (amd_iommu_v2_pgtbl_supported() &&
check_feature(FEATURE_PPR) &&
check_feature(FEATURE_EPHSUP));
}

3
drivers/iommu/amd/init.c
View File

@@ -2071,8 +2071,7 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
init_iommu_perf_ctr(iommu);
if (amd_iommu_pgtable == AMD_IOMMU_V2) {
if (!check_feature(FEATURE_GIOSUP) ||
!check_feature(FEATURE_GT)) {
if (!amd_iommu_v2_pgtbl_supported()) {
pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n");
amd_iommu_pgtable = AMD_IOMMU_V1;
}