diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-08-25 09:39:37 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-09-07 17:12:36 +0300 |
| commit | 643feb0072d5aad9bf5f38eca3fb78c2f8d9f140 (patch) | |
| tree | ff7901b74547d1b602032f6cf0467ea2a91224c2 /drivers/iommu | |
| parent | aaac38f614871df252aa7459647bf68d42f7c3e7 (diff) | |
| download | linux-643feb0072d5aad9bf5f38eca3fb78c2f8d9f140.tar.xz | |
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')
| -rw-r--r-- | drivers/iommu/amd/amd_iommu_types.h | 3 | ||||
| -rw-r--r-- | drivers/iommu/amd/init.c | 13 | ||||
| -rw-r--r-- | drivers/iommu/amd/iommu.c | 3 |
3 files changed, 19 insertions, 0 deletions
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h index 660c1f044912..1beed57fc35d 100644 --- a/drivers/iommu/amd/amd_iommu_types.h +++ b/drivers/iommu/amd/amd_iommu_types.h @@ -94,6 +94,7 @@ #define FEATURE_HE (1ULL<<8) #define FEATURE_PC (1ULL<<9) #define FEATURE_GAM_VAPIC (1ULL<<21) +#define FEATURE_GIOSUP (1ULL<<48) #define FEATURE_EPHSUP (1ULL<<50) #define FEATURE_SNP (1ULL<<63) @@ -378,6 +379,7 @@ #define DTE_FLAG_IW (1ULL << 62) #define DTE_FLAG_IOTLB (1ULL << 32) +#define DTE_FLAG_GIOV (1ULL << 54) #define DTE_FLAG_GV (1ULL << 55) #define DTE_FLAG_MASK (0x3ffULL << 32) #define DTE_GLX_SHIFT (56) @@ -436,6 +438,7 @@ #define PD_PASSTHROUGH_MASK (1UL << 2) /* domain has no page translation */ #define PD_IOMMUV2_MASK (1UL << 3) /* domain has gcr3 table */ +#define PD_GIOV_MASK (1UL << 4) /* domain enable GIOV support */ extern bool amd_iommu_dump; #define DUMP_printk(format, arg...) \ 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) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index c882b06e2360..6abc338dc207 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -1597,6 +1597,9 @@ static void set_dte_entry(struct amd_iommu *iommu, u16 devid, tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C; flags |= tmp; + + if (domain->flags & PD_GIOV_MASK) + pte_root |= DTE_FLAG_GIOV; } flags &= ~DEV_DOMID_MASK; |