linux-kernel - [PATCH v2 0/2] SMMU v3 CMDQ fix and improvement

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Message-Id: <20251020224353.1408-1-jacob.pan@linux.microsoft.com>
Date: Mon, 20 Oct 2025 15:43:51 -0700
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 v2 0/2] SMMU v3 CMDQ fix and improvement

Hi Will et al,

These two patches are derived from testing SMMU driver with smaller CMDQ
sizes where we see soft lockups.

This happens on HyperV emulated SMMU v3 as well as baremetal ARM servers
with artificially reduced queue size and microbenchmark to stress test
concurrency.

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 | 97 ++++++++++-----------
 1 file changed, 47 insertions(+), 50 deletions(-)

-- 
2.43.0