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drm/i915: Skip final clflush if LLC is coherent 

If the LLC is coherent with the object, we do not need to worry about
whether main memory and cache mismatch when we hand the object back to
the system.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161118211747.25197-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-11-18 21:17:47 +00:00
parent a6a7cc4b7d
commit 05c348377d
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem.c
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@ -229,7 +229,8 @@ __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
if (obj->mm.madv == I915_MADV_DONTNEED)
obj->mm.dirty = false;
if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0)
if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0 &&
!cpu_cache_is_coherent(obj->base.dev, obj->cache_level))
drm_clflush_sg(pages);
obj->base.read_domains = I915_GEM_DOMAIN_CPU;