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

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Message-ID: <20251120091035.000011c2@linux.microsoft.com>
Date: Thu, 20 Nov 2025 09:10:35 -0800
From: Jacob Pan <jacob.pan@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org, "iommu@...ts.linux.dev"
 <iommu@...ts.linux.dev>, Will Deacon <will@...nel.org>, Joerg Roedel
 <joro@...tes.org>, Mostafa Saleh <smostafa@...gle.com>, Jason Gunthorpe
 <jgg@...dia.com>, Robin Murphy <robin.murphy@....com>, Nicolin Chen
 <nicolinc@...dia.com>
Cc: Zhang Yu <zhangyu1@...ux.microsoft.com>, Jean Philippe-Brucker
 <jean-philippe@...aro.org>, Alexander Grest <Alexander.Grest@...rosoft.com>
Subject: Re: [PATCH v4 0/2] SMMU v3 CMDQ fix and improvement

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@...ux.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(-)
>