iommu/amd: Fix missing CMD_COMPLETE_PPR response for invalid PPR requests

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The AMD IOMMU spec, requires the host to respond with a CMD_COMPLETE_PPR
command when an EVENT_TYPE_INV_PPR_REQ event is received with the RX bit
cleared. This response was missing in the current implementation, leaving
invalid PPR requests unacknowledged.

Introduce amd_iommu_report_ppr_err() to handle EVENT_TYPE_INV_PPR_REQ
events. The new function logs the invalid PPR request and when the RX
bit is cleared, sends CMD_COMPLETE_PPR response.

Reported-by: Gaultier Delbarre <Gaultier.Delbarre@amd.com>
Co-developed-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Ankit Soni <Ankit.Soni@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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This commit is contained in:

Vasant Hegde 2026-08-11 04:08:58 +00:00 • committed by Joerg Roedel

parent 589f0cc1e0

commit bc1f5ec826

2 changed files with 33 additions and 6 deletions

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1

drivers/iommu/amd/amd_iommu_types.h

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38

drivers/iommu/amd/iommu.c

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