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From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: linux-kernel@vger.kernel.org,
	"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
	Will Deacon <will@kernel.org>, Jason Gunthorpe <jgg@nvidia.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Nicolin Chen <nicolinc@nvidia.com>,
	Joerg Roedel <joro@8bytes.org>
Cc: Zhang Yu <zhangyu1@linux.microsoft.com>,
	Jean Philippe-Brucker <jean-philippe@linaro.org>,
	Alexander Grest <Alexander.Grest@microsoft.com>
Subject: Re: [PATCH 0/2] SMMU v3 CMDQ fix and improvement
Date: Thu, 16 Oct 2025 08:31:02 -0700	[thread overview]
Message-ID: <20251016083102.0000585d@linux.microsoft.com> (raw)
In-Reply-To: <20250924175438.7450-1-jacob.pan@linux.microsoft.com>

Hi Will,

Just wondering if you had a chance to review these?

Thanks,

Jacob

On Wed, 24 Sep 2025 10:54:36 -0700
Jacob Pan <jacob.pan@linux.microsoft.com> wrote:

> 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(-)
> 


  parent reply	other threads:[~2025-10-16 15:31 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-24 17:54 [PATCH 0/2] SMMU v3 CMDQ fix and improvement Jacob Pan
2025-09-24 17:54 ` [PATCH 1/2] iommu/arm-smmu-v3: Fix CMDQ timeout warning Jacob Pan
2025-10-07  0:44   ` Nicolin Chen
2025-10-07 16:12     ` Jacob Pan
2025-10-07 16:32       ` Nicolin Chen
2025-09-24 17:54 ` [PATCH 2/2] iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency Jacob Pan
2025-10-07  1:08   ` Nicolin Chen
2025-10-07 18:16     ` Jacob Pan
2025-10-17 11:04   ` Mostafa Saleh
2025-10-19  5:32     ` Jacob Pan
2025-10-06 15:14 ` [PATCH 0/2] SMMU v3 CMDQ fix and improvement Jacob Pan
2025-10-16 15:31 ` Jacob Pan [this message]
2025-10-17 10:57 ` Mostafa Saleh
2025-10-17 13:51   ` Jason Gunthorpe
2025-10-17 14:44     ` Robin Murphy
2025-10-17 16:50     ` Jacob Pan
2025-10-20 12:02       ` Jason Gunthorpe
2025-10-20 18:57         ` Jacob Pan
2025-10-21 11:45           ` Robin Murphy
2025-10-21 20:37             ` Jacob Pan

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