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

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Message-ID: <20240712152612.GA16474@willie-the-truck>
Date: Fri, 12 Jul 2024 16:26:12 +0100
From: Will Deacon <will@...nel.org>
To: Robin Murphy <robin.murphy@....com>
Cc: Jon Hunter <jonathanh@...dia.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 12:48:31PM +0100, Robin Murphy wrote:
> On 2024-07-12 12:01 pm, Jon Hunter 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 :(

Ha, so it is!

> 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.

Jon -- any chance you could give this fix a go, please? I'm hesitant to
drop the whole branch just for this, but we've basically run out of time
for 6.11 and so knowing we have a working fix would be really helpful.

Cheers,

Will