[Bug 94125] [SNA HSW bisected] git commit "sna: Skip sync if we have an idle coherent bo" causes corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94125

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

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

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Decided to revert the shortcircuit on the write side:

commit aacc3442bb8c280a6ebc1fc1e34451613a72d7c4
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Feb 18 10:15:11 2016 +0000

    sna: Restrict set-domain short-circuit to readonly

    If we write to the bo, we do want the kernel to mark it as dirty (for
    the purposes of swap invalidation and the like), so we can't apply the
    shortcircuit.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

that should almost completely nerf the commit (except iirc you will still hit
the shortcircuit!).

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