drm/i915: move more pte encoding to pte encode

In order to handle differences in pte encoding between architectures it
is desirable to have one helper function, pte_encode, do it all for us.
As such, this commit moves the code around so we're in good shape to do
that.

Luckily the ppgtt pte and the ggtt pte look very similar.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -32,11 +32,32 @@ typedef uint32_t gtt_pte_t;
 
 static inline gtt_pte_t pte_encode(struct drm_device *dev,
 				   dma_addr_t addr,
-				   gtt_pte_t cache_bits)
+				   enum i915_cache_level level)
 {
 	gtt_pte_t pte = GEN6_PTE_VALID;
 	pte |= GEN6_PTE_ADDR_ENCODE(addr);
-	pte |= cache_bits;
+
+	switch (level) {
+	case I915_CACHE_LLC_MLC:
+		/* Haswell doesn't set L3 this way */
+		if (IS_HASWELL(dev))
+			pte |= GEN6_PTE_CACHE_LLC;
+		else
+			pte |= GEN6_PTE_CACHE_LLC_MLC;
+		break;
+	case I915_CACHE_LLC:
+		pte |= GEN6_PTE_CACHE_LLC;
+		break;
+	case I915_CACHE_NONE:
+		if (IS_HASWELL(dev))
+			pte |= HSW_PTE_UNCACHED;
+		else
+			pte |= GEN6_PTE_UNCACHED;
+		break;
+	default:
+		BUG();
+	}
+
 
 	return pte;
 }
@@ -53,7 +74,7 @@ static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
 	unsigned last_pte, i;
 
 	scratch_pte = pte_encode(ppgtt->dev, ppgtt->scratch_page_dma_addr,
-				 GEN6_PTE_CACHE_LLC);
+				 I915_CACHE_LLC);
 
 	while (num_entries) {
 		last_pte = first_pte + num_entries;
@@ -182,7 +203,7 @@ void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev)
 static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,
 					 const struct sg_table *pages,
 					 unsigned first_entry,
-					 gtt_pte_t pte_flags)
+					 enum i915_cache_level cache_level)
 {
 	gtt_pte_t *pt_vaddr;
 	unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;
@@ -203,7 +224,7 @@ static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,
 		for (j = first_pte; j < I915_PPGTT_PT_ENTRIES; j++) {
 			page_addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 			pt_vaddr[j] = pte_encode(ppgtt->dev, page_addr,
-						 pte_flags);
+						 cache_level);
 
 			/* grab the next page */
 			if (++m == segment_len) {
@@ -227,33 +248,10 @@ void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
 			    struct drm_i915_gem_object *obj,
 			    enum i915_cache_level cache_level)
 {
-	gtt_pte_t pte_flags = GEN6_PTE_VALID;
-
-	switch (cache_level) {
-	case I915_CACHE_LLC_MLC:
-		/* Haswell doesn't set L3 this way */
-		if (IS_HASWELL(ppgtt->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;
-		break;
-	case I915_CACHE_NONE:
-		if (IS_HASWELL(ppgtt->dev))
-			pte_flags |= HSW_PTE_UNCACHED;
-		else
-			pte_flags |= GEN6_PTE_UNCACHED;
-		break;
-	default:
-		BUG();
-	}
-
 	i915_ppgtt_insert_sg_entries(ppgtt,
 				     obj->pages,
 				     obj->gtt_space->start >> PAGE_SHIFT,
-				     pte_flags);
+				     cache_level);
 }
 
 void i915_ppgtt_unbind_object(struct i915_hw_ppgtt *ppgtt,