iommu/vt-d: Fail probe on ATS configuration failure

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Update the Intel VT-d driver to handle ATS configuration and enablement
more strictly. Specifically, update the device probe to fail if
pci_prepare_ats() returns an error. This ensures that any ATS-capable
master reaching the attach phase is guaranteed to have a valid config.

Additionally, update iommu_enable_pci_ats() to WARN() if pci_enable_ats
fails. Since earlier checks in the probe phase preclude config-related
failures, any failure during hardware enablement is considered a kernel
bug.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Pranjal Shrivastava 2026-06-15 23:50:37 +00:00 • committed by Joerg Roedel

parent d23da7b8d6

commit eab000d501

1 changed files with 12 additions and 3 deletions

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drivers/iommu/intel/iommu.c

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