[Bug 107514] [CI][BAT] igt at drv_selftest@live_coherency - dmesg-fail - Value[9/31] mismatch, (overwrite with gtt) wrote [gpu] fcf5ab91 read [cpu] 30a546e (inverse 30a546e), at offset cc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107514

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

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit f6844a85e0c96a55c61fa3e611f414999b11e4de
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jul 30 08:53:51 2018 +0100

    drm/i915/selftests: Replace opencoded clflush with drm_clflush_virt_range

    We occasionally see that the clflush prior to a read of GPU data is
    returning stale data, reminiscent of much earlier bugs fixed by adding a
    second clflush for serialisation. As drm_clflush_virt_range() already
    supplies the workaround, use it rather than open code the clflush
    instruction.

    References: 396f5d62d1a5 ("drm: Restore double clflush on the last partial
cacheline")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Matthew Auld <matthew.auld at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180730075351.15569-3-chris@chris-wilson.co.uk

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