Hi Will et al,

These two patches address logic issues that occur when SMMU CMDQ spaces
are nearly exhausted at runtime. The problems become more pronounced
when multiple CPUs submit to a single queue, a common scenario under SVA
when shared buffers (used by both CPU and device) are being unmapped.


Thanks,

Jacob 

Alexander Grest (1):
  iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency

Jacob Pan (2):
  iommu/arm-smmu-v3: Parameterize wfe for CMDQ polling
  iommu/arm-smmu-v3: Fix CMDQ timeout warning

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 90 +++++++++++----------
 1 file changed, 49 insertions(+), 41 deletions(-)

-- 
2.43.0

On Mon, 08 Dec 2025 13:28:54 -0800, Jacob Pan wrote:
> These two patches address logic issues that occur when SMMU CMDQ spaces
> are nearly exhausted at runtime. The problems become more pronounced
> when multiple CPUs submit to a single queue, a common scenario under SVA
> when shared buffers (used by both CPU and device) are being unmapped.
> 
> 
> Thanks,
> 
> [...]

Applied third patch to iommu (arm/smmu/updates), thanks!

[3/3] iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency
      https://git.kernel.org/iommu/c/df180b1a4cc5

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev