linux-kernel - Re: [PATCH v3 22/23] iommu/tegra241-cmdqv: Add user-space use support

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Message-ID: <aBP/JKyZlskIdS/0@Asurada-Nvidia>
Date: Thu, 1 May 2025 16:09:24 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <corbet@....net>,
	<will@...nel.org>
CC: <bagasdotme@...il.com>, <robin.murphy@....com>, <joro@...tes.org>,
	<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
	<shuah@...nel.org>, <jsnitsel@...hat.com>, <nathan@...nel.org>,
	<peterz@...radead.org>, <yi.l.liu@...el.com>, <mshavit@...gle.com>,
	<praan@...gle.com>, <zhangzekun11@...wei.com>, <iommu@...ts.linux.dev>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>,
	<mochs@...dia.com>, <alok.a.tiwari@...cle.com>, <vasant.hegde@....com>
Subject: Re: [PATCH v3 22/23] iommu/tegra241-cmdqv: Add user-space use support

On Thu, May 01, 2025 at 04:01:28PM -0700, Nicolin Chen wrote:
> +static void tegra241_vcmdq_hw_flush_timeout(struct tegra241_vcmdq *vcmdq)
> +{
> +	struct arm_smmu_device *smmu = &vcmdq->cmdqv->smmu;
> +	u64 cmd_sync[CMDQ_ENT_DWORDS] = {};
> +
> +	cmd_sync[0] = FIELD_PREP(CMDQ_0_OP, CMDQ_OP_CMD_SYNC) |
> +		      FIELD_PREP(CMDQ_SYNC_0_CS, CMDQ_SYNC_0_CS_NONE);
> +
> +	/*
> +	 * It does not hurt to insert another CMD_SYNC, taking adavantage of the

Oh, ignore the "adavantage". Will fix in the next version.

Nicolin