linux-kernel - Re: [PATCH v3 2/5] iommu: Resolve fwspec ops automatically

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Message-ID: <20240712152648.GB16474@willie-the-truck>
Date: Fri, 12 Jul 2024 16:26:48 +0100
From: Will Deacon <will@...nel.org>
To: Jon Hunter <jonathanh@...dia.com>
Cc: Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Yong Wu <yong.wu@...iatek.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] iommu: Resolve fwspec ops automatically

On Fri, Jul 12, 2024 at 04:24:48PM +0100, Jon Hunter wrote:
> 
> On 12/07/2024 12:48, Robin Murphy wrote:
> 
> ...
> 
> > > I am seeing some failures on -next with some of our devices. Bisect
> > > is pointing to this commit. Looks like the host1x device is no
> > > longer probing successfully. I see the following ...
> > > 
> > >   tegra-host1x 50000000.host1x: failed to initialize fwspec: -517
> > >   nouveau 57000000.gpu: failed to initialize fwspec: -517
> > > 
> > > The probe seems to be deferred forever. The above is seen on
> > > Tegra210 but Tegra30 and Tegra194 are also having the same problem.
> > > Interestingly it is not all devices and so make me wonder if we are
> > > missing something on these devices? Let me know if you have any
> > > thoughts.
> > 
> > Ugh, tegra-smmu has been doing a complete nonsense this whole time - on
> > closer inspection, it's passing the fwnode of the *client device* where
> > it should be that of the IOMMU device :(
> > 
> > I *think* it should probably just be a case of:
> > 
> > -    err = iommu_fwspec_init(dev, of_fwnode_handle(dev->of_node));
> > +    err = iommu_fwspec_init(dev, of_fwnode_handle(smmu->dev->of_node));
> > 
> > since smmu->dev appears to be the same one initially passed to
> > iommu_device_register(), so it at least ought to match and work, but the
> > SMMU device vs. MC device thing leaves me mildly wary of how correct it
> > might be overall.
> > 
> > (Also now I'm wondering why I didn't just use dev_fwnode() there...)
> 
> 
> Yes making that change in the tegra-smmu driver does fix it.

Fantastic! I'll pick it up right now.

Cheers,

Will