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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-12-14 13:57:23 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-03-01 21:36:13 +0100 |
| commit | c501ae7f332cdaf42e31af30b72b4b66cbbb1604 (patch) | |
| tree | a644a973c5b1f7afb72046f9ba80b68440b57ede /drivers/gpu/drm/i915 | |
| parent | drm/i915: reenable gmbus on gen3+ again (diff) | |
| download | linux-c501ae7f332cdaf42e31af30b72b4b66cbbb1604.tar.xz linux-c501ae7f332cdaf42e31af30b72b4b66cbbb1604.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 6dbcec387951..1f441f5c2405 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3064,10 +3064,13 @@ i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj) return ret; } + ret = i915_gem_object_wait_rendering(obj); + if (ret) + return ret; + /* Ensure that we invalidate the GPU's caches and TLBs. */ obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS; - - return i915_gem_object_wait_rendering(obj); + return 0; } /** |