iommu/amd: Fix premature break in init_iommu_one() again

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Commit 283d245468 ("iommu/amd: Fix premature break in
init_iommu_one()") unintentionally broke older platforms - such as
the ASRockRack B550D4-4L - where the BIOS advertises incorrect IOMMU
features.

Move the HATDis check ahead of the GASup check, and re-introduce the
break inside the GASup check to restore correct behavior on affected
platforms.

This is a short-term fix to resolve the regression. Longer term, we
should rework how EFRs are tracked and prioritize the MMIO-advertised
EFR over the one reported via IVRS. That requires more extensive
changes and will be addressed separately.

Fixes: 283d245468 ("iommu/amd: Fix premature break in init_iommu_one()")
Reported-by: Andreas Juch <andreas@juch.cc>
Closes: https://lore.kernel.org/linux-iommu/07b2d390-f7a0-47e2-bc2c-eb0853acf52e@juch.cc/
Tested-by: Andreas Juch <andreas@juch.cc>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

...

This commit is contained in:

Vasant Hegde 2026-08-24 06:29:07 +00:00 • committed by Joerg Roedel

parent 00a7dd6488

commit eb29b7bbc8

1 changed files with 6 additions and 5 deletions

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drivers/iommu/amd/init.c

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