iommu/amd: Enhance "Completion-wait Time-out" error message

Browse source

Current IOMMU driver prints "Completion-wait Time-out" error message with
insufficient information to further debug the issue.

Enhancing the error message as following:
1. Log IOMMU PCI device ID in the error message.
2. With "amd_iommu_dump=1" kernel command line option, dump entire
   command buffer entries including Head and Tail offset.

Dump the entire command buffer only on the first 'Completion-wait Time-out'
to avoid dmesg spam.

Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com>
Reviewed-by: Ankit Soni <Ankit.Soni@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

...

This commit is contained in:

Dheeraj Kumar Srivastava 2025-11-13 02:43:50 +05:30 • committed by Joerg Roedel

parent a0c7005333

commit d1e281f832

2 changed files with 31 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

drivers/iommu/amd/amd_iommu_types.h

View file

28

drivers/iommu/amd/iommu.c

View file