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 <ch...@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dad24f6eeeb5..a82077358ae0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -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;
--
2.10.2
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