From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Peter Zijlstra <peterz@infradead.org>, <will@kernel.org>,
<jean-philippe@linaro.org>, <robin.murphy@arm.com>,
<joro@8bytes.org>, <balbirs@nvidia.com>,
<miko.lenczewski@arm.com>, <kevin.tian@intel.com>,
<praan@google.com>, <linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux.dev>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v7 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based arm_smmu_domain_inv_range()
Date: Tue, 16 Dec 2025 11:14:42 -0800 [thread overview]
Message-ID: <aUGvojnCaMKWM6QG@Asurada-Nvidia> (raw)
In-Reply-To: <20251216141511.GD6079@nvidia.com>
On Tue, Dec 16, 2025 at 10:15:11AM -0400, Jason Gunthorpe wrote:
> This also has a pre-existing dma_wmb(), a fuller chart would be like this:
>
> arm_smmu_domain_inv_range() arm_smmu_install_new_domain_invs()
>
> [W] IOPTE [Wrel] smmu_domain->invs
> smp_mb() smp_mb() <--- arm_smmu_install_new_domain_invs()
> [build the STE]
> [post the STE]
> dma_wmb() <--- arm_smmu_cmdq_issue_cmdlist()
> Doorbell Write to Device
> [Lacq] smmu_domain->invs [L] IOPTE via DMA
>
> Nicolin, please elabortate more of these details in the comment.
Ack. I will add the chart above.
Thanks
Nicolin
next prev parent reply other threads:[~2025-12-16 19:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-16 2:09 [PATCH v7 0/7] iommu/arm-smmu-v3: Introduce an RCU-protected invalidation array Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 1/7] iommu/arm-smmu-v3: Explicitly set smmu_domain->stage for SVA Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 2/7] iommu/arm-smmu-v3: Add an inline arm_smmu_domain_free() Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu_invs array Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 4/7] iommu/arm-smmu-v3: Pre-allocate a per-master invalidation array Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 5/7] iommu/arm-smmu-v3: Populate smmu_domain->invs when attaching masters Nicolin Chen
2025-12-16 2:09 ` [PATCH v7 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based arm_smmu_domain_inv_range() Nicolin Chen
2025-12-16 9:09 ` Peter Zijlstra
2025-12-16 13:56 ` Jason Gunthorpe
2025-12-16 14:04 ` Peter Zijlstra
2025-12-16 14:15 ` Jason Gunthorpe
2025-12-16 19:14 ` Nicolin Chen [this message]
2025-12-16 2:09 ` [PATCH v7 7/7] iommu/arm-smmu-v3: Perform per-domain invalidations using arm_smmu_invs Nicolin Chen
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