[PATCH 6/6] drm: Optionally create mm blocks from top-to-bottom

3 Jul 2013

From: Chris Wilson chris@chris-wilson.co.uk
Clients like i915 needs to segregate cache domains within the GTT which
can lead to small amounts of fragmentation. By allocating the uncached
buffers from the bottom and the cacheable buffers from the top, we can
reduce the amount of wasted space and also optimize allocation of the
mappable portion of the GTT to only those buffers that require CPU
access through the GTT.
v2 by Ben:
Update callers in i915_gem_object_bind_to_gtt()
Turn search flags and allocation flags into separate enums
Make checkpatch happy where logical/easy
v3: by Ben:
Rebased on create_block removal
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk
CC: dri-devel@lists.freedesktop.org
Signed-off-by: Ben Widawsky ben@bwidawsk.net
Conflicts:
    drivers/gpu/drm/drm_mm.c
    include/drm/drm_mm.h
---
 drivers/gpu/drm/drm_mm.c               | 121 +++++++++++++++------------
 drivers/gpu/drm/i915/i915_gem.c        |   4 +-
 drivers/gpu/drm/i915/i915_gem_gtt.c    |   3 +-
 drivers/gpu/drm/i915/i915_gem_stolen.c |   5 +-
 include/drm/drm_mm.h                   | 148 ++++++++++++++++++++-------------
 5 files changed, 166 insertions(+), 115 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 9e8dfbc..4a30d55 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -49,7 +49,7 @@
#define MM_UNUSED_TARGET 4
-static struct drm_mm_node *drm_mm_kmalloc(struct drm_mm *mm, int atomic)
+static struct drm_mm_node *drm_mm_kmalloc(struct drm_mm *mm, bool atomic)
 {
    struct drm_mm_node *child;
@@ -105,7 +105,8 @@ EXPORT_SYMBOL(drm_mm_pre_get);
 static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
    			 struct drm_mm_node *node,
    			 unsigned long size, unsigned alignment,
-				 unsigned long color)
+				 unsigned long color,
+				 enum drm_mm_allocator_flags flags)
 {
    struct drm_mm *mm = hole_node->mm;
    unsigned long hole_start = drm_mm_hole_node_start(hole_node);
@@ -118,12 +119,22 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
    if (mm->color_adjust)
    	mm->color_adjust(hole_node, color, &adj_start, &adj_end);
+	if (flags & DRM_MM_CREATE_TOP)
+		adj_start = adj_end - size;
+
    if (alignment) {
    	unsigned tmp = adj_start % alignment;
-		if (tmp)
-			adj_start += alignment - tmp;
+		if (tmp) {
+			if (flags & DRM_MM_CREATE_TOP)
+				adj_start -= tmp;
+			else
+				adj_start += alignment - tmp;
+		}
    }
+	BUG_ON(adj_start < hole_start);
+	BUG_ON(adj_end > hole_end);
+
    if (adj_start == hole_start) {
    	hole_node->hole_follows = 0;
    	list_del(&hole_node->hole_stack);
@@ -148,7 +159,8 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
 }
int drm_mm_create_block(struct drm_mm *mm, struct drm_mm_node *node,
-			unsigned long start, unsigned long size)
+			unsigned long start, unsigned long size,
+			enum drm_mm_allocator_flags flags)
 {
    struct drm_mm_node *hole;
    unsigned long end = start + size;
@@ -190,15 +202,15 @@ struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
    				     unsigned long size,
    				     unsigned alignment,
    				     unsigned long color,
-					     int atomic)
+					     enum drm_mm_allocator_flags flags)
 {
    struct drm_mm_node *node;
-	node = drm_mm_kmalloc(hole_node->mm, atomic);
+	node = drm_mm_kmalloc(hole_node->mm, flags & DRM_MM_CREATE_ATOMIC);
    if (unlikely(node == NULL))
    	return NULL;
-	drm_mm_insert_helper(hole_node, node, size, alignment, color);
+	drm_mm_insert_helper(hole_node, node, size, alignment, color, flags);
return node;
 }
@@ -211,32 +223,28 @@ EXPORT_SYMBOL(drm_mm_get_block_generic);
  */
 int drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
    		       unsigned long size, unsigned alignment,
-			       unsigned long color)
+			       unsigned long color,
+			       enum drm_mm_allocator_flags aflags,
+			       enum drm_mm_search_flags sflags)
 {
    struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free_generic(mm, size, alignment,
-					       color, 0);
+					       color, sflags);
    if (!hole_node)
    	return -ENOSPC;
-	drm_mm_insert_helper(hole_node, node, size, alignment, color);
+	drm_mm_insert_helper(hole_node, node, size, alignment, color, aflags);
    return 0;
 }
 EXPORT_SYMBOL(drm_mm_insert_node_generic);
-int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
-		       unsigned long size, unsigned alignment)
-{
-	return drm_mm_insert_node_generic(mm, node, size, alignment, 0);
-}
-EXPORT_SYMBOL(drm_mm_insert_node);
-
 static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
    			       struct drm_mm_node *node,
    			       unsigned long size, unsigned alignment,
    			       unsigned long color,
-				       unsigned long start, unsigned long end)
+				       unsigned long start, unsigned long end,
+				       enum drm_mm_search_flags flags)
 {
    struct drm_mm *mm = hole_node->mm;
    unsigned long hole_start = drm_mm_hole_node_start(hole_node);
@@ -251,13 +259,20 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
    if (adj_end > end)
    	adj_end = end;
+	if (flags & DRM_MM_CREATE_TOP)
+		adj_start = adj_end - size;
+
    if (mm->color_adjust)
    	mm->color_adjust(hole_node, color, &adj_start, &adj_end);
if (alignment) {
    	unsigned tmp = adj_start % alignment;
-		if (tmp)
-			adj_start += alignment - tmp;
+		if (tmp) {
+			if (flags & DRM_MM_CREATE_TOP)
+				adj_start -= tmp;
+			else
+				adj_start += alignment - tmp;
+		}
    }
if (adj_start == hole_start) {
@@ -274,6 +289,8 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
    INIT_LIST_HEAD(&node->hole_stack);
    list_add(&node->node_list, &hole_node->node_list);
+	BUG_ON(node->start < start);
+	BUG_ON(node->start < adj_start);
    BUG_ON(node->start + node->size > adj_end);
    BUG_ON(node->start + node->size > end);
@@ -284,22 +301,23 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
    }
 }
-struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *hole_node,
-						unsigned long size,
-						unsigned alignment,
-						unsigned long color,
-						unsigned long start,
-						unsigned long end,
-						int atomic)
+struct drm_mm_node *
+drm_mm_get_block_range_generic(struct drm_mm_node *hole_node,
+			       unsigned long size,
+			       unsigned alignment,
+			       unsigned long color,
+			       unsigned long start,
+			       unsigned long end,
+			       enum drm_mm_allocator_flags flags)
 {
    struct drm_mm_node *node;
-	node = drm_mm_kmalloc(hole_node->mm, atomic);
+	node = drm_mm_kmalloc(hole_node->mm, flags & DRM_MM_CREATE_ATOMIC);
    if (unlikely(node == NULL))
    	return NULL;
drm_mm_insert_helper_range(hole_node, node, size, alignment, color,
-				   start, end);
+				   start, end, flags);
return node;
 }
@@ -312,31 +330,25 @@ EXPORT_SYMBOL(drm_mm_get_block_range_generic);
  */
 int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *node,
    				unsigned long size, unsigned alignment, unsigned long color,
-					unsigned long start, unsigned long end)
+					unsigned long start, unsigned long end,
+					enum drm_mm_allocator_flags aflags,
+					enum drm_mm_search_flags sflags)
 {
    struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free_in_range_generic(mm,
    						size, alignment, color,
-							start, end, 0);
+							start, end, sflags);
    if (!hole_node)
    	return -ENOSPC;
drm_mm_insert_helper_range(hole_node, node,
    			   size, alignment, color,
-				   start, end);
+				   start, end, aflags);
    return 0;
 }
 EXPORT_SYMBOL(drm_mm_insert_node_in_range_generic);
-int drm_mm_insert_node_in_range(struct drm_mm *mm, struct drm_mm_node *node,
-				unsigned long size, unsigned alignment,
-				unsigned long start, unsigned long end)
-{
-	return drm_mm_insert_node_in_range_generic(mm, node, size, alignment, 0, start, end);
-}
-EXPORT_SYMBOL(drm_mm_insert_node_in_range);
-
 /**
  * Remove a memory node from the allocator.
  */
@@ -412,7 +424,7 @@ struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
    				       unsigned long size,
    				       unsigned alignment,
    				       unsigned long color,
-					       bool best_match)
+					       enum drm_mm_search_flags flags)
 {
    struct drm_mm_node *entry;
    struct drm_mm_node *best;
@@ -425,7 +437,8 @@ struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
    best = NULL;
    best_size = ~0UL;
-	drm_mm_for_each_hole(entry, mm, adj_start, adj_end) {
+	__drm_mm_for_each_hole(entry, mm, adj_start, adj_end,
+			       flags & DRM_MM_SEARCH_BELOW) {
    	if (mm->color_adjust) {
    		mm->color_adjust(entry, color, &adj_start, &adj_end);
    		if (adj_end <= adj_start)
@@ -435,7 +448,7 @@ struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
    	if (!check_free_hole(adj_start, adj_end, size, alignment))
    		continue;
-		if (!best_match)
+		if ((flags & DRM_MM_SEARCH_BEST) == 0)
    		return entry;
if (entry->size < best_size) {
@@ -448,13 +461,14 @@ struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
 }
 EXPORT_SYMBOL(drm_mm_search_free_generic);
-struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
-							unsigned long size,
-							unsigned alignment,
-							unsigned long color,
-							unsigned long start,
-							unsigned long end,
-							bool best_match)
+struct drm_mm_node *
+drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
+				    unsigned long size,
+				    unsigned alignment,
+				    unsigned long color,
+				    unsigned long start,
+				    unsigned long end,
+				    enum drm_mm_search_flags flags)
 {
    struct drm_mm_node *entry;
    struct drm_mm_node *best;
@@ -467,7 +481,8 @@ struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
    best = NULL;
    best_size = ~0UL;
-	drm_mm_for_each_hole(entry, mm, adj_start, adj_end) {
+	__drm_mm_for_each_hole(entry, mm, adj_start, adj_end,
+			       flags & DRM_MM_SEARCH_BELOW) {
    	if (adj_start < start)
    		adj_start = start;
    	if (adj_end > end)
@@ -482,7 +497,7 @@ struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
    	if (!check_free_hole(adj_start, adj_end, size, alignment))
    		continue;
-		if (!best_match)
+		if ((flags & DRM_MM_SEARCH_BEST) == 0)
    		return entry;
if (entry->size < best_size) {
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6cb9210..9a0470b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3115,7 +3115,9 @@ search_free:
    ret = drm_mm_insert_node_in_range_generic(&dev_priv->mm.gtt_space,
    					  &obj->ggtt_space,
    					  size, alignment,
-						  obj->cache_level, 0, gtt_max);
+						  obj->cache_level, 0, gtt_max,
+						  DRM_MM_CREATE_DEFAULT,
+						  DRM_MM_SEARCH_DEFAULT);
    if (ret) {
    	ret = i915_gem_evict_something(dev, size, alignment,
    				       obj->cache_level,
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 4df6159..081f77e 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -637,7 +637,8 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
    	ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
    				  &obj->ggtt_space,
    				  i915_gem_obj_ggtt_offset(obj),
-					  obj->base.size);
+					  obj->base.size,
+					  DRM_MM_CREATE_DEFAULT);
    	if (ret)
    		DRM_DEBUG_KMS("Reservation failed\n");
    	obj->has_global_gtt_mapping = 1;
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index dc68b30..0d19710 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -350,7 +350,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
    	return NULL;
ret = drm_mm_create_block(&dev_priv->mm.stolen, stolen, stolen_offset,
-				  size);
+				  size, DRM_MM_CREATE_DEFAULT);
    if (ret) {
    	DRM_DEBUG_KMS("failed to allocate stolen space\n");
    	kfree(stolen);
@@ -376,7 +376,8 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
    if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
    	ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
    				  &obj->ggtt_space,
-					  gtt_offset, size);
+					  gtt_offset, size,
+					  DRM_MM_CREATE_DEFAULT);
    	if (ret) {
    		DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
    		goto unref_out;
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index d8b56b7..2915c43 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -41,6 +41,21 @@
 #include <linux/seq_file.h>
 #endif
+enum drm_mm_allocator_flags {
+	DRM_MM_CREATE_DEFAULT = 0,
+	DRM_MM_CREATE_ATOMIC = 1<<0,
+	DRM_MM_CREATE_TOP = 1<<1,
+};
+
+enum drm_mm_search_flags {
+	DRM_MM_SEARCH_DEFAULT = 0,
+	DRM_MM_SEARCH_BEST = 1<<0,
+	DRM_MM_SEARCH_BELOW = 1<<1,
+};
+
+#define DRM_MM_BOTTOMUP DRM_MM_CREATE_DEFAULT, DRM_MM_SEARCH_DEFAULT
+#define DRM_MM_TOPDOWN DRM_MM_CREATE_TOP, DRM_MM_SEARCH_BELOW
+
 struct drm_mm_node {
    struct list_head node_list;
    struct list_head hole_stack;
@@ -135,30 +150,41 @@ static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node)
         1 : 0; \
         entry = list_entry(entry->hole_stack.next, struct drm_mm_node, hole_stack))
+#define __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, backwards) \
+	for (entry = list_entry((backwards) ? (mm)->hole_stack.prev : (mm)->hole_stack.next, struct drm_mm_node, hole_stack); \
+	     &entry->hole_stack != &(mm)->hole_stack ? \
+	     hole_start = drm_mm_hole_node_start(entry), \
+	     hole_end = drm_mm_hole_node_end(entry), \
+	     1 : 0; \
+	     entry = list_entry((backwards) ? entry->hole_stack.prev : entry->hole_stack.next, struct drm_mm_node, hole_stack))
+
 /*
  * Basic range manager support (drm_mm.c)
  */
 extern int drm_mm_create_block(struct drm_mm *mm,
    		       struct drm_mm_node *node,
    		       unsigned long start,
-			       unsigned long size);
-extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
-						    unsigned long size,
-						    unsigned alignment,
-						    unsigned long color,
-						    int atomic);
-extern struct drm_mm_node *drm_mm_get_block_range_generic(
-						struct drm_mm_node *node,
-						unsigned long size,
-						unsigned alignment,
-						unsigned long color,
-						unsigned long start,
-						unsigned long end,
-						int atomic);
+			       unsigned long size,
+			       enum drm_mm_allocator_flags flags);
+extern struct drm_mm_node *
+drm_mm_get_block_generic(struct drm_mm_node *node,
+			 unsigned long size,
+			 unsigned alignment,
+			 unsigned long color,
+			 enum drm_mm_allocator_flags flags);
+extern struct drm_mm_node *
+drm_mm_get_block_range_generic(struct drm_mm_node *node,
+			       unsigned long size,
+			       unsigned alignment,
+			       unsigned long color,
+			       unsigned long start,
+			       unsigned long end,
+			       enum drm_mm_allocator_flags flags);
-static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
-						   unsigned long size,
-						   unsigned alignment)
+static inline struct drm_mm_node *
+drm_mm_get_block(struct drm_mm_node *parent,
+		 unsigned long size,
+		 unsigned alignment)
 {
    return drm_mm_get_block_generic(parent, size, alignment, 0, 0);
 }
@@ -166,7 +192,8 @@ static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *pa
    						  unsigned long size,
    						  unsigned alignment)
 {
-	return drm_mm_get_block_generic(parent, size, alignment, 0, 1);
+	return drm_mm_get_block_generic(parent, size, alignment, 0,
+					DRM_MM_CREATE_ATOMIC);
 }
 static inline struct drm_mm_node *drm_mm_get_block_range(
    					struct drm_mm_node *parent,
@@ -197,39 +224,41 @@ static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
    					unsigned long end)
 {
    return drm_mm_get_block_range_generic(parent, size, alignment, 0,
-						start, end, 1);
+						start, end,
+						DRM_MM_CREATE_ATOMIC);
 }
-extern int drm_mm_insert_node(struct drm_mm *mm,
-			      struct drm_mm_node *node,
-			      unsigned long size,
-			      unsigned alignment);
-extern int drm_mm_insert_node_in_range(struct drm_mm *mm,
-				       struct drm_mm_node *node,
-				       unsigned long size,
-				       unsigned alignment,
-				       unsigned long start,
-				       unsigned long end);
 extern int drm_mm_insert_node_generic(struct drm_mm *mm,
    			      struct drm_mm_node *node,
    			      unsigned long size,
    			      unsigned alignment,
-				      unsigned long color);
-extern int drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
-				       struct drm_mm_node *node,
-				       unsigned long size,
-				       unsigned alignment,
-				       unsigned long color,
-				       unsigned long start,
-				       unsigned long end);
+				      unsigned long color,
+				      enum drm_mm_allocator_flags aflags,
+				      enum drm_mm_search_flags sflags);
+#define drm_mm_insert_node(mm, node, size, alignment) \
+	drm_mm_insert_node_generic(mm, node, size, alignment, 0, 0)
+extern int
+drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
+				    struct drm_mm_node *node,
+				    unsigned long size,
+				    unsigned alignment,
+				    unsigned long color,
+				    unsigned long start,
+				    unsigned long end,
+				    enum drm_mm_allocator_flags aflags,
+				    enum drm_mm_search_flags sflags);
+#define drm_mm_insert_node_in_range(mm, node, size, alignment, start, end) \
+	drm_mm_insert_node_in_range_generic(mm, node, size, alignment, 0, start, end, 0)
 extern void drm_mm_put_block(struct drm_mm_node *cur);
 extern void drm_mm_remove_node(struct drm_mm_node *node);
 extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
-extern struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
-						      unsigned long size,
-						      unsigned alignment,
-						      unsigned long color,
-						      bool best_match);
+
+extern struct drm_mm_node *
+drm_mm_search_free_generic(const struct drm_mm *mm,
+			   unsigned long size,
+			   unsigned alignment,
+			   unsigned long color,
+			   enum drm_mm_search_flags flags);
 extern struct drm_mm_node *drm_mm_search_free_in_range_generic(
    					const struct drm_mm *mm,
    					unsigned long size,
@@ -237,13 +266,15 @@ extern struct drm_mm_node *drm_mm_search_free_in_range_generic(
    					unsigned long color,
    					unsigned long start,
    					unsigned long end,
-						bool best_match);
-static inline struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
-						     unsigned long size,
-						     unsigned alignment,
-						     bool best_match)
+						enum drm_mm_search_flags flags);
+
+static inline struct drm_mm_node *
+drm_mm_search_free(const struct drm_mm *mm,
+		   unsigned long size,
+		   unsigned alignment,
+		   enum drm_mm_search_flags flags)
 {
-	return drm_mm_search_free_generic(mm,size, alignment, 0, best_match);
+	return drm_mm_search_free_generic(mm, size, alignment, 0, flags);
 }
 static inline  struct drm_mm_node *drm_mm_search_free_in_range(
    					const struct drm_mm *mm,
@@ -251,18 +282,19 @@ static inline  struct drm_mm_node *drm_mm_search_free_in_range(
    					unsigned alignment,
    					unsigned long start,
    					unsigned long end,
-						bool best_match)
+						enum drm_mm_search_flags flags)
 {
    return drm_mm_search_free_in_range_generic(mm, size, alignment, 0,
-						   start, end, best_match);
+						   start, end, flags);
 }
-static inline struct drm_mm_node *drm_mm_search_free_color(const struct drm_mm *mm,
-							   unsigned long size,
-							   unsigned alignment,
-							   unsigned long color,
-							   bool best_match)
+static inline struct drm_mm_node *
+drm_mm_search_free_color(const struct drm_mm *mm,
+			 unsigned long size,
+			 unsigned alignment,
+			 unsigned long color,
+			 enum drm_mm_search_flags flags)
 {
-	return drm_mm_search_free_generic(mm,size, alignment, color, best_match);
+	return drm_mm_search_free_generic(mm, size, alignment, color, flags);
 }
 static inline  struct drm_mm_node *drm_mm_search_free_in_range_color(
    					const struct drm_mm *mm,
@@ -271,10 +303,10 @@ static inline  struct drm_mm_node *drm_mm_search_free_in_range_color(
    					unsigned long color,
    					unsigned long start,
    					unsigned long end,
-						bool best_match)
+						enum drm_mm_search_flags flags)
 {
    return drm_mm_search_free_in_range_generic(mm, size, alignment, color,
-						   start, end, best_match);
+						   start, end, flags);
 }
 extern int drm_mm_init(struct drm_mm *mm,
    	       unsigned long start,
-- 
1.8.3.2


    

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[PATCH 6/6] drm: Optionally create mm blocks from top-to-bottom