kernels/linux-libre-aufs_friendly

1 files changed, 55 insertions, 0 deletions

diff --git a/kernels/linux-libre-aufs_friendly/i915-gpu-finish.patch b/kernels/linux-libre-aufs_friendly/i915-gpu-finish.patch
new file mode 100644
index 000000000..5840c9181
--- /dev/null
+++ b/kernels/linux-libre-aufs_friendly/i915-gpu-finish.patch
@@ -0,0 +1,55 @@
+commit 389a55581e30607af0fcde6cdb4e54f189cf46cf
+Author: Chris Wilson <chris@chris-wilson.co.uk>
+Date:   Tue Nov 29 15:12:16 2011 +0000
+
+    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>
+
+diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
+index d560175..036bc58 100644
+--- a/drivers/gpu/drm/i915/i915_gem.c
++++ b/drivers/gpu/drm/i915/i915_gem.c
+@@ -3087,10 +3087,13 @@ 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;
+ }
+ 
+ /**