]> git.baikalelectronics.ru Git - kernel.git/commit
drm/i915: Only clear the GPU domains upon a successful finish
authorChris Wilson <chris@chris-wilson.co.uk>
Wed, 14 Dec 2011 12:57:23 +0000 (13:57 +0100)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Thu, 1 Mar 2012 20:36:13 +0000 (21:36 +0100)
commitd6fecbc2d5fc4fda6f1cd15ec421d71608fc6d21
treea644a973c5b1f7afb72046f9ba80b68440b57ede
parent34ce5ebc0d7393ee8bdb838ad0e8a644b9dcada2
drm/i915: Only clear the GPU domains upon a successful finish

By clearing the GPU read domains before waiting upon the buffer, we run
the risk of the wait being interrupted and the domains prematurely
cleared. The next time we attempt to wait upon the buffer (after
userspace handles the signal), we believe that the buffer is idle and so
skip the wait.

There are a number of bugs across all generations which show signs of an
overly haste reuse of active buffers.

Such as:

  https://bugs.freedesktop.org/show_bug.cgi?id=29046
  https://bugs.freedesktop.org/show_bug.cgi?id=35863
  https://bugs.freedesktop.org/show_bug.cgi?id=38952
  https://bugs.freedesktop.org/show_bug.cgi?id=40282
  https://bugs.freedesktop.org/show_bug.cgi?id=41098
  https://bugs.freedesktop.org/show_bug.cgi?id=41102
  https://bugs.freedesktop.org/show_bug.cgi?id=41284
  https://bugs.freedesktop.org/show_bug.cgi?id=42141

A couple of those pre-date i915_gem_object_finish_gpu(), so may be
unrelated (such as a wild write from a userspace command buffer), but
this does look like a convincing cause for most of those bugs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_gem.c