[Bug 111187] [CI][DRMTIP] igt at gem_ctx_shared@exec-shared-gtt-render - fail - Failed assertion: *s == 0xc0ffee

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111187

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

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 7e4d10507088055413769a020dd674f52b4bc1b0 (HEAD, upstream/master)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Jul 23 17:13:18 2019 +0100

    i915/gem_ctx_shared: Avoid clflush by using WC for readback

    As we never officially write to the scratch buffer, the kernel will
    leave it in the CPU read domain upon execution. Our attempt to
    invalidate the CPU cache on !llc is therefore skipped as the kernel
    doesn't believe the backing store has been invalidated. Use a WC mmap to
    avoid the CPU cache for readback, and add an extra sanity check that the
    scratch buffer is found at the same location after execution. (This
    sanity check does not affect the failure rate on bsw, that is only fixed
    after realising that we do not clflush for the invalidate prior to the
    read).

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111187
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Matthew Auld <matthew.auld at intel.com>

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