RE: [PATCH v2 6/7] iommu/arm-smmu-v3: Introduce master->ats_broken flag
From: "Tian, Kevin" <kevin.tian@intel.com>
Date: 2026-03-18 07:40:01
Also in:
linux-acpi, linux-iommu, linux-pci, lkml
quoted hunk ↗ jump to hunk
From: Nicolin Chen <redacted> Sent: Wednesday, March 18, 2026 3:16 AM@@ -3060,6 +3079,14 @@ static bool arm_smmu_ats_supported(structarm_smmu_master *master) if (!(fwspec->flags & IOMMU_FWSPEC_PCI_RC_ATS)) return false; + /* + * Reject any new ATS request because ATC invalidation was timed out. + * The PCI device should go through a recovery (reset) and notify the + * SMMUv3 driver via a reset_device_done callback. + */ + if (READ_ONCE(master->ats_broken)) + return false; +
"Reject any new ATS request" means any new request to enable ATS on this device, instead of rejecting any new ATS translation request, correct? next patch does the actual work to block ATS...