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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [PNV Bisected]igt/gem_exec_big fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88191#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [PNV Bisected]igt/gem_exec_big fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88191">bug 88191</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>The magic so far:
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index c7f4048..e5a6d52 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -332,6 +332,8 @@ relocate_entry_gtt(struct drm_i915_gem_object *obj,
if (ret)
return ret;
+ mb();
+
/* Map the page containing the relocation we're going to perform. */
offset = i915_gem_obj_ggtt_offset(obj);
offset += reloc->offset;</pre>
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