[v4] SMMU v3 CMDQ fix and improvement

[PATCH v4 0/2] SMMU v3 CMDQ fix and improvement

Jacob Pan posted 2 patches 2 months, 3 weeks ago

Diff against v2 v3 v5
Download series mbox

There is a newer version of this series

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 72 +++++++++++----------
1 file changed, 37 insertions(+), 35 deletions(-)

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[PATCH v4 0/2] SMMU v3 CMDQ fix and improvement

Posted by Jacob Pan 2 months, 3 weeks ago

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 (1):
  iommu/arm-smmu-v3: Fix CMDQ timeout warning

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 72 +++++++++++----------
 1 file changed, 37 insertions(+), 35 deletions(-)

-- 
2.43.0

Re: [PATCH v4 0/2] SMMU v3 CMDQ fix and improvement

Posted by Jacob Pan 2 months, 2 weeks ago

Hi Joerg/Will,

Any more comments on these? I could spin another version to add
Nicolin's Reviewed-by tag for patch 1/2.

Thanks,

Jacob

On Fri, 14 Nov 2025 09:17:16 -0800
Jacob Pan <jacob.pan@linux.microsoft.com> wrote:

> 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 (1):
>   iommu/arm-smmu-v3: Fix CMDQ timeout warning
> 
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 72
> +++++++++++---------- 1 file changed, 37 insertions(+), 35
> deletions(-)
>