linux-kernel - Re: [PATCH v4 05/16] iommu: Move bus setup to IOMMU device registration

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Date:   Thu, 6 Oct 2022 15:01:14 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Robin Murphy <robin.murphy@....com>, joro@...tes.org
Cc:     will@...nel.org, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, baolu.lu@...ux.intel.com,
        kevin.tian@...el.com, suravee.suthikulpanit@....com,
        vasant.hegde@....com, mjrosato@...ux.ibm.com,
        schnelle@...ux.ibm.com, linux-kernel@...r.kernel.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH v4 05/16] iommu: Move bus setup to IOMMU device
 registration

Hi Robin,

On 15/08/2022 17:20, Robin Murphy wrote:
> Move the bus setup to iommu_device_register(). This should allow
> bus_iommu_probe() to be correctly replayed for multiple IOMMU instances,
> and leaves bus_set_iommu() as a glorified no-op to be cleaned up next.
> 
> At this point we can also handle cleanup better than just rolling back
> the most-recently-touched bus upon failure - which may release devices
> owned by other already-registered instances, and still leave devices on
> other buses with dangling pointers to the failed instance. Now it's easy
> to clean up the exact footprint of a given instance, no more, no less.


Since this change, I have noticed that the DRM driver on Tegra20 is 
failing to probe and I am seeing ...

  tegra-gr2d 54140000.gr2d: failed to attach to domain: -19
  drm drm: failed to initialize 54140000.gr2d: -19

Bisect points to this change and reverting it fixes it. Let me know if 
you have any thoughts.

Cheers
Jon

-- 
nvpublic