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

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Message-Id: <20250924175438.7450-1-jacob.pan@linux.microsoft.com>
Date: Wed, 24 Sep 2025 10:54:36 -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>,
	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 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 | 85 +++++++++------------
 1 file changed, 35 insertions(+), 50 deletions(-)

-- 
2.43.0