[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|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Two bugs here, this is the dmesg splat from the earlier WC one.

commit add00e6d896fab882e6115ed4908b2456f1b3a85
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jul 6 12:54:02 2018 +0100

    drm/i915: Flush the WCB following a WC write

    If we have just completed a WC write, we must ensure that the WCB (Write
    Combining Buffer) is flushed out to main memory before we can expect to
    see the results. This is especially important when mixing WC with GTT as
    the physical paths are different and cachelines are not naturally flushed.

    Testcase: igt/drv_selftests/live_coherency #gdg
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Matthew Auld <matthew.auld at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180706115402.18547-1-chris@chris-wilson.co.uk


commit 3a32497f0dbe170794e1506deb41dc44c4fea8d9
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jul 6 18:49:26 2018 +0100

    drm/i915/selftests: Provide full mb() around clflush

    clflush is an unserialised instruction and the IA manual strongly advises
    you to serialise it with a mb. To be cautious, apply one before and one
    after, so that it is serialised with both writes and reads without
    worrying too much about the required direction.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180706174926.4712-1-chris@chris-wilson.co.uk

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