[Bug 107164] [CI][GDG] igt at drv_selftest@live_coherency igt_gem_coherency failed with error -22

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107164

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
It's been a while, I proclaim this fixed! (That should be enough for it
spontaneously occur again.)


commit a679f58d051025db6fa86226c4d35650b75e990f
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Mar 21 16:19:07 2019 +0000

    drm/i915: Flush pages on acquisition

    When we return pages to the system, we ensure that they are marked as
    being in the CPU domain since any external access is uncontrolled and we
    must assume the worst. This means that we need to always flush the pages
    on acquisition if we need to use them on the GPU, and from the beginning
    have used set-domain. Set-domain is overkill for the purpose as it is a
    general synchronisation barrier, but our intent is to only flush the
    pages being swapped in. If we move that flush into the pages acquisition
    phase, we know then that when we have obj->mm.pages, they are coherent
    with the GPU and need only maintain that status without resorting to
    heavy handed use of set-domain.

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