From: Jason Gunthorpe <jgg@ziepe.ca>
To: Ashish Mhetre <amhetre@nvidia.com>
Cc: catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net,
skhan@linuxfoundation.org, robin.murphy@arm.com, joro@8bytes.org,
nicolinc@nvidia.com, linux-arm-kernel@lists.infradead.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux.dev, linux-tegra@vger.kernel.org
Subject: Re: [PATCH v7 1/3] iommu/arm-smmu-v3: Factor out CMDQ batch force-sync conditions
Date: Fri, 17 Jul 2026 16:59:19 -0300 [thread overview]
Message-ID: <20260717195919.GB701389@ziepe.ca> (raw)
In-Reply-To: <20260714104202.1664187-2-amhetre@nvidia.com>
On Tue, Jul 14, 2026 at 10:42:00AM +0000, Ashish Mhetre wrote:
> From: Nicolin Chen <nicolinc@nvidia.com>
>
> arm_smmu_cmdq_batch_add_cmd_p() carries two distinct reasons for
> flushing the current batch with a CMD_SYNC before appending the
> new command:
>
> - The batch's pre-assigned cmdq does not support the new command.
> - The Arm erratum 2812531 workaround (ARM_SMMU_OPT_CMDQ_FORCE_SYNC)
> forces a SYNC at one entry before the batch is full.
>
> Lift those checks into a new arm_smmu_cmdq_batch_force_sync() helper
> so that adding another force-sync condition becomes a one-line
> addition. No functional change.
>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 23 +++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2026-07-17 19:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 10:41 [PATCH v7 0/3] iommu/arm-smmu-v3: Tegra264 invalidation workaround Ashish Mhetre
2026-07-14 10:42 ` [PATCH v7 1/3] iommu/arm-smmu-v3: Factor out CMDQ batch force-sync conditions Ashish Mhetre
2026-07-17 19:59 ` Jason Gunthorpe [this message]
2026-07-14 10:42 ` [PATCH v7 2/3] iommu/arm-smmu-v3: Introduce CFGI/TLBI-repeat workaround infrastructure Ashish Mhetre
2026-07-17 20:18 ` Jason Gunthorpe
2026-07-17 21:16 ` Nicolin Chen
2026-07-14 10:42 ` [PATCH v7 3/3] iommu/arm-smmu-v3: Enable CFGI/TLBI-repeat workaround on Tegra264 Ashish Mhetre
2026-07-17 20:19 ` Jason Gunthorpe
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