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 14:00:59 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...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 Sun, May 12, 2024 at 12:54:49PM -0300, Jason Gunthorpe wrote:
> On Tue, May 07, 2024 at 10:56:53PM -0700, Nicolin Chen wrote:
> > +#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 think that is a much better practice! Let me try with it.

Thanks!
Nicolin