[Intel-gfx] [PATCH 01/10] drm/i915: No LLC_MLC for HSW.

[Ben Widawsky]

The mid-level cache or as it's more commonly referred to now as L3, is
not setup this way on HSW.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 47e427e..5751ad2 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -218,7 +218,11 @@ void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
 
 	switch (cache_level) {
 	case I915_CACHE_LLC_MLC:
-		pte_flags |= GEN6_PTE_CACHE_LLC_MLC;
+		/* Haswell doesn't set L3 this way */
+		if (IS_HASWELL(obj->base.dev))
+			pte_flags |= GEN6_PTE_CACHE_LLC;
+		else
+			pte_flags |= GEN6_PTE_CACHE_LLC_MLC;
 		break;
 	case I915_CACHE_LLC:
 		pte_flags |= GEN6_PTE_CACHE_LLC;
@@ -253,12 +257,12 @@ static unsigned int cache_level_to_agp_type(struct drm_device *dev,
 {
 	switch (cache_level) {
 	case I915_CACHE_LLC_MLC:
-		if (INTEL_INFO(dev)->gen >= 6)
-			return AGP_USER_CACHED_MEMORY_LLC_MLC;
 		/* Older chipsets do not have this extra level of CPU
 		 * cacheing, so fallthrough and request the PTE simply
 		 * as cached.
 		 */
+		if (INTEL_INFO(dev)->gen >= 6 && !IS_HASWELL(dev))
+			return AGP_USER_CACHED_MEMORY_LLC_MLC;
 	case I915_CACHE_LLC:
 		return AGP_USER_CACHED_MEMORY;
 	default:
-- 
1.7.12.4