diff options
| author | Mario Limonciello | 2022-04-25 13:42:05 +0100 |
|---|---|---|
| committer | Joerg Roedel | 2022-04-28 10:30:25 +0200 |
| commit | f1ca70717bcb4525e29da422f3d280acbddb36fe (patch) | |
| tree | e1e5f973872b7c9acee3ce2f7494fb500b8f26b0 /drivers/iommu/amd/init.c | |
| parent | 86eaf4a5b4312bea8676fb79399d9e08b53d8e71 (diff) | |
iommu/amd: Indicate whether DMA remap support is enabled
Bit 1 of the IVFS IVInfo field indicates that IOMMU has been used for
pre-boot DMA protection.
Export this capability to allow other places in the kernel to be able to
check for it on AMD systems.
Link: https://www.amd.com/system/files/TechDocs/48882_IOMMU.pdf
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/ce7627fa1c596878ca6515dd9d4381a45b6ee38c.1650878781.git.robin.murphy@arm.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 | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index b4a798c7b347..0467918bf7fd 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -182,6 +182,7 @@ u32 amd_iommu_max_pasid __read_mostly = ~0; bool amd_iommu_v2_present __read_mostly; static bool amd_iommu_pc_present __read_mostly; +bool amdr_ivrs_remap_support __read_mostly; bool amd_iommu_force_isolation __read_mostly; @@ -326,6 +327,8 @@ static void __init early_iommu_features_init(struct amd_iommu *iommu, { if (amd_iommu_ivinfo & IOMMU_IVINFO_EFRSUP) iommu->features = h->efr_reg; + if (amd_iommu_ivinfo & IOMMU_IVINFO_DMA_REMAP) + amdr_ivrs_remap_support = true; } /* Access to l1 and l2 indexed register spaces */ |