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

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Message-Id: <20251105190638.23172-1-jacob.pan@linux.microsoft.com>
Date: Wed,  5 Nov 2025 11:06:36 -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: Jacob Pan <jacob.pan@...ux.microsoft.com>,
	Zhang Yu <zhangyu1@...ux.microsoft.com>,
	Jean Philippe-Brucker <jean-philippe@...aro.org>,
	Alexander Grest <Alexander.Grest@...rosoft.com>
Subject: [PATCH v3 0/2] SMMU v3 CMDQ fix and improvement

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 | 74 +++++++++++----------
 1 file changed, 40 insertions(+), 34 deletions(-)

-- 
2.43.0