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>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 11670cd812a3510c6ba546ae9358740ad027f517..9bddd4fbbdf8c49b59e9adf3748208aaf0c6d3c0 100644 (file)
--- 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;
 }