[Bug 100932] [regression] GPU hangs and misrendering in Vulkan programs on GEN8+ SoCs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100932

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[regression] GPU hangs in   |[regression] GPU hangs and
                   |Sacha Willems'              |misrendering in Vulkan
                   |Multithreading Vulkan demo  |programs on GEN8+ SoCs

--- Comment #6 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Jason Ekstrand from comment #3)
> Ok, I managed to track down what I think the problem is.  When a BO has the
> EXEC_OBJECT_ASYNC flag set, the kernel is not properly flushing
> write-combine mappings.  I'm not sure if this is a kernel bug or if that
> behavior is intended.

(In reply to Chris Wilson from comment #4)
> Write-combined mappings? They are always flushed. Write-back mappings on
> byt/bsw/bxt are left to you since you opt out of the kernel synchronisation.

Hangs are still happening.  And rendering in all Vulkan demos is broken on all
SoCs since this too.

Is there a plan to address the issue (in some other way than reverting the
breaking commit)?

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