linux-kernel - Re: [PATCH v11 8/9] iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV

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Message-ID: <ZsklI7GPHaXWLNU/@Asurada-Nvidia>
Date: Fri, 23 Aug 2024 17:11:15 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Will Deacon <will@...nel.org>
CC: <robin.murphy@....com>, <joro@...tes.org>, <jgg@...dia.com>,
	<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 v11 8/9] iommu/arm-smmu-v3: Add in-kernel support for
 NVIDIA Tegra241 (Grace) CMDQV

On Fri, Aug 23, 2024 at 04:38:17PM +0100, Will Deacon wrote:
> On Fri, Aug 16, 2024 at 10:41:06AM -0700, Nicolin Chen wrote:
> > On Fri, Aug 16, 2024 at 03:19:26PM +0100, Will Deacon wrote:
> >
> > > [...]
> > >
> > > > +struct arm_smmu_device *
> > > > +tegra241_cmdqv_acpi_dsdt_probe(struct arm_smmu_device *smmu,
> > > > +                            struct acpi_iort_node *node)
> > > > +{
> > > > +     struct resource *res;
> > > > +     int irq;
> > > > +
> > > > +     /* Keep the pointer smmu intact if !res */
> > > > +     res = tegra241_cmdqv_find_acpi_resource(smmu, node, &irq);
> > > > +     if (!res)
> > > > +             return smmu;
> > >
> > > Given that this probing code will end up running on non-tegra hardware
> > > when CONFIG_TEGRA241_CMDQV is enabled, please can you move the common
> > > part into the main driver?
> >
> > You mean moving the tegra241_cmdqv_acpi_dsdt_probe() into the main
> > driver? I think this v11 puts a function call int he header already.
> 
> Right. I basically want it so that !tegra folks don't have to open
> the tegra-specific file to look at the code running on their SoC.
> 
> We should also running that code at all on implementations which _do_
> advertise a distinct model number in IORT.

Done. I did my best to incorporate that and sent v13. Please check.

Thanks
Nicolin