[PATCH 0/2] iommu/amd: Fix default domain selection for PASID-capable devices

[Vasant Hegde <vasant.hegde@amd.com>]

This series addresses a long-standing issue in the default domain
selection path of the AMD IOMMU driver.

Currently, the driver unconditionally forces an identity domain on all
devices that support PASID (Process Address Space ID).

This series introduces a more targeted approach: instead of applying identity
domain assignment globally to all PASID-capable devices, quirks are added only
for specific GPUs. All remaining PASID-capable devices are now allowed to boot
with a paging domain, enabling proper use of page tables (v2 page table).

In addition, this series adds an ATS (Address Translation Service) quirk
for the "Radeon GPU WX 4100" to ensure correct operation when booted
with a paging domain.

Vasant Hegde (2):
  PCI: Mark Radeon Pro WX 4100 ATS as broken
  iommu/amd: Force identity mode for selected GPUs only

 drivers/iommu/amd/iommu.c | 56 +++++++++++++++++++++++++++++++--------
 drivers/pci/quirks.c      |  2 ++
 2 files changed, 47 insertions(+), 11 deletions(-)

-- 
2.31.1