linux-kernel - Re: [PATCH v7 5/6] iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV

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Date: Sun, 12 May 2024 12:54:49 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v7 5/6] iommu/arm-smmu-v3: Add in-kernel support for
 NVIDIA Tegra241 (Grace) CMDQV

On Tue, May 07, 2024 at 10:56:53PM -0700, Nicolin Chen wrote:

> +/* MMIO helpers */
> +#define cmdqv_readl(_cmdqv, _regname) \
> +	readl((_cmdqv)->base + TEGRA241_CMDQV_##_regname)
> +#define cmdqv_readl_relaxed(_cmdqv, _regname) \
> +	readl_relaxed((_cmdqv)->base + TEGRA241_CMDQV_##_regname)
> +#define cmdqv_readq_relaxed(_cmdqv, _regname) \
> +	readq_relaxed((_cmdqv)->base + TEGRA241_CMDQV_##_regname)
> +#define cmdqv_writel(_cmdqv, val, _regname) \
> +	writel((val), (_cmdqv)->base + TEGRA241_CMDQV_##_regname)
> +#define cmdqv_writel_relaxed(_cmdqv, val, _regname) \
> +	writel_relaxed((val), (_cmdqv)->base + TEGRA241_CMDQV_##_regname)
> +
> +#define vintf_readl(_vintf, _regname) \
> +	readl((_vintf)->base + TEGRA241_VINTF_##_regname)
> +#define vintf_readq_relaxed(_vintf, _regname) \
> +	readq_relaxed((_vintf)->base + TEGRA241_VINTF_##_regname)
> +#define vintf_readl_relaxed(_vintf, _regname) \
> +	readl_relaxed((_vintf)->base + TEGRA241_VINTF_##_regname)
> +#define vintf_writel(_vintf, val, _regname) \
> +	writel((val), (_vintf)->base + TEGRA241_VINTF_##_regname)
> +#define vintf_writel_relaxed(_vintf, val, _regname) \
> +	writel_relaxed((val), (_vintf)->base + TEGRA241_VINTF_##_regname)
> +
> +#define vcmdq_page0_readl(_vcmdq, _regname) \
> +	readl((_vcmdq)->page0 + TEGRA241_VCMDQ_##_regname)
> +#define vcmdq_page0_readl_relaxed(_vcmdq, _regname) \
> +	readl_relaxed((_vcmdq)->page0 + TEGRA241_VCMDQ_##_regname)
> +#define vcmdq_page0_writel(_vcmdq, val, _regname) \
> +	writel((val), (_vcmdq)->page0 + TEGRA241_VCMDQ_##_regname)
> +#define vcmdq_page0_writel_relaxed(_vcmdq, val, _regname) \
> +	writel_relaxed((val), (_vcmdq)->page0 + TEGRA241_VCMDQ_##_regname)
> +
> +#define vcmdq_page1_readl(_vcmdq, reg) \
> +	readl((_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_readl_relaxed(_vcmdq, reg) \
> +	readl_relaxed((_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_readq_relaxed(_vcmdq, reg) \
> +	readq_relaxed((_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_writel(_vcmdq, val, reg) \
> +	writel((val), (_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_writel_relaxed(_vcmdq, val, reg) \
> +	writel_relaxed((val), (_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_writeq(_vcmdq, val, reg) \
> +	writeq((val), (_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)
> +#define vcmdq_page1_writeq_relaxed(_vcmdq, val, reg) \
> +	writeq_relaxed((val), (_vcmdq)->page1 + TEGRA241_VCMDQ_##reg)

These still need to be trimmed to only the ones being used. I still
think it is a bad idea, maybe a middle ground is to wrapper the
regsiter coding

writeq_relaxed(val, REG_CMDQ_PAGE1(vcmdq, XXX));

Is still short enough and safe enough without creating so much obfuscation..

I didn't notice anything else in this patch

Jason