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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2023-11-22 11:26:04 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-11-27 11:07:52 +0100 |
| commit | da37dddcf4caf015c400a930301d2ee27a7a15fb (patch) | |
| tree | fc5530dc4ec56ad306d0b9373f654e0729ac1926 | |
| parent | 0f5432a9b839847dcfe9fa369d72e3d646102ddf (diff) | |
| download | linux-xfs-da37dddcf4caf015c400a930301d2ee27a7a15fb.tar.gz | |
iommu/vt-d: Disable PCI ATS in legacy passthrough mode
When IOMMU hardware operates in legacy mode, the TT field of the context
entry determines the translation type, with three supported types (Section
9.3 Context Entry):
- DMA translation without device TLB support
- DMA translation with device TLB support
- Passthrough mode with translated and translation requests blocked
Device TLB support is absent when hardware is configured in passthrough
mode.
Disable the PCI ATS feature when IOMMU is configured for passthrough
translation type in legacy (non-scalable) mode.
Fixes: 0faa19a1515f ("iommu/vt-d: Decouple PASID & PRI enabling from SVA")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20231114011036.70142-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 11670cd812a35..9bddd4fbbdf8c 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2492,7 +2492,8 @@ static int dmar_domain_attach_device(struct dmar_domain *domain, return ret; } - iommu_enable_pci_caps(info); + if (sm_supported(info->iommu) || !domain_type_is_si(info->domain)) + iommu_enable_pci_caps(info); return 0; } |