linux-kernel - Re: [PATCH v7 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based arm_smmu_domain_inv

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Message-ID: <aUGvojnCaMKWM6QG@Asurada-Nvidia>
Date: Tue, 16 Dec 2025 11:14:42 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: Peter Zijlstra <peterz@...radead.org>, <will@...nel.org>,
	<jean-philippe@...aro.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<balbirs@...dia.com>, <miko.lenczewski@....com>, <kevin.tian@...el.com>,
	<praan@...gle.com>, <linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 6/7] iommu/arm-smmu-v3: Add arm_smmu_invs based
 arm_smmu_domain_inv_range()

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