diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-08-25 06:39:37 +0000 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-09-07 16:12:36 +0200 |
| commit | 643feb0072d5aad9bf5f38eca3fb78c2f8d9f140 (patch) | |
| tree | ff7901b74547d1b602032f6cf0467ea2a91224c2 /drivers/iommu/amd/init.c | |
| parent | aaac38f614871df252aa7459647bf68d42f7c3e7 (diff) | |
iommu/amd: Add support for Guest IO protection
AMD IOMMU introduces support for Guest I/O protection where the request
from the I/O device without a PASID are treated as if they have PASID 0.
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220825063939.8360-8-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd/init.c')
| -rw-r--r-- | drivers/iommu/amd/init.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index fdc642362c14..779d4f9b17f8 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -2068,6 +2068,17 @@ static int __init iommu_init_pci(struct amd_iommu *iommu) init_iommu_perf_ctr(iommu); + if (amd_iommu_pgtable == AMD_IOMMU_V2) { + if (!iommu_feature(iommu, FEATURE_GIOSUP) || + !iommu_feature(iommu, FEATURE_GT)) { + pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n"); + amd_iommu_pgtable = AMD_IOMMU_V1; + } else if (iommu_default_passthrough()) { + pr_warn("V2 page table doesn't support passthrough mode. Fallback to v1.\n"); + amd_iommu_pgtable = AMD_IOMMU_V1; + } + } + if (is_rd890_iommu(iommu->dev)) { int i, j; @@ -2146,6 +2157,8 @@ static void print_iommu_info(void) if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE) pr_info("X2APIC enabled\n"); } + if (amd_iommu_pgtable == AMD_IOMMU_V2) + pr_info("V2 page table enabled\n"); } static int __init amd_iommu_init_pci(void) |