linux-kernel - Re: [PATCH v2 05/10] iommu/arm-smmu-v3: Flush iotlb in arm_smmu_iotlb_tag

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Message-ID: <20260126210833.GA1134360@nvidia.com>
Date: Mon, 26 Jan 2026 17:08:33 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org, jpb@...nel.org,
	praan@...gle.com, miko.lenczewski@....com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v2 05/10] iommu/arm-smmu-v3: Flush iotlb in
 arm_smmu_iotlb_tag_free()

On Wed, Jan 21, 2026 at 05:24:23PM -0800, Nicolin Chen wrote:
>  static void arm_smmu_iotlb_tag_free(struct arm_smmu_inv *tag)
>  {
> +	struct arm_smmu_cmdq_ent cmd = {
> +		.opcode = tag->nsize_opcode,
> +	};
> +
> +	if (tag->type == INV_TYPE_S1_ASID)
> +		cmd.tlbi.asid = tag->id;
> +	else
> +		cmd.tlbi.vmid = tag->id;
> +	arm_smmu_cmdq_issue_cmd_with_sync(tag->smmu, &cmd);

I think in all these places checking the tag->type it is probably a
good idea to not use a catch all else for vmid? We have many tag types
and some should never come to this, or other, functions.

Jason