drm: Add search/get functions to get a block in a specific range

These are required for changes to TTM.
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_mm.c

@@ -226,6 +226,44 @@ struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
 }
 EXPORT_SYMBOL(drm_mm_get_block_generic);
 
+struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *node,
+						unsigned long size,
+						unsigned alignment,
+						unsigned long start,
+						unsigned long end,
+						int atomic)
+{
+	struct drm_mm_node *align_splitoff = NULL;
+	unsigned tmp = 0;
+	unsigned wasted = 0;
+
+	if (node->start < start)
+		wasted += start - node->start;
+	if (alignment)
+		tmp = ((node->start + wasted) % alignment);
+
+	if (tmp)
+		wasted += alignment - tmp;
+	if (wasted) {
+		align_splitoff = drm_mm_split_at_start(node, wasted, atomic);
+		if (unlikely(align_splitoff == NULL))
+			return NULL;
+	}
+
+	if (node->size == size) {
+		list_del_init(&node->fl_entry);
+		node->free = 0;
+	} else {
+		node = drm_mm_split_at_start(node, size, atomic);
+	}
+
+	if (align_splitoff)
+		drm_mm_put_block(align_splitoff);
+
+	return node;
+}
+EXPORT_SYMBOL(drm_mm_get_block_range_generic);
+
 /*
  * Put a block. Merge with the previous and / or next block if they are free.
  * Otherwise add to the free stack.
@@ -331,6 +369,56 @@ struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 }
 EXPORT_SYMBOL(drm_mm_search_free);
 
+struct drm_mm_node *drm_mm_search_free_in_range(const struct drm_mm *mm,
+						unsigned long size,
+						unsigned alignment,
+						unsigned long start,
+						unsigned long end,
+						int best_match)
+{
+	struct list_head *list;
+	const struct list_head *free_stack = &mm->fl_entry;
+	struct drm_mm_node *entry;
+	struct drm_mm_node *best;
+	unsigned long best_size;
+	unsigned wasted;
+
+	best = NULL;
+	best_size = ~0UL;
+
+	list_for_each(list, free_stack) {
+		entry = list_entry(list, struct drm_mm_node, fl_entry);
+		wasted = 0;
+
+		if (entry->size < size)
+			continue;
+
+		if (entry->start > end || (entry->start+entry->size) < start)
+			continue;
+
+		if (entry->start < start)
+			wasted += start - entry->start;
+
+		if (alignment) {
+			register unsigned tmp = (entry->start + wasted) % alignment;
+			if (tmp)
+				wasted += alignment - tmp;
+		}
+
+		if (entry->size >= size + wasted) {
+			if (!best_match)
+				return entry;
+			if (size < best_size) {
+				best = entry;
+				best_size = entry->size;
+			}
+		}
+	}
+
+	return best;
+}
+EXPORT_SYMBOL(drm_mm_search_free_in_range);
+
 int drm_mm_clean(struct drm_mm * mm)
 {
 	struct list_head *head = &mm->ml_entry;

include/drm/drm_mm.h

@@ -66,6 +66,13 @@ extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
 						    unsigned long size,
 						    unsigned alignment,
 						    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 start,
+						unsigned long end,
+						int atomic);
 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
 						   unsigned long size,
 						   unsigned alignment)
@@ -78,11 +85,38 @@ static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *pa
 {
 	return drm_mm_get_block_generic(parent, size, alignment, 1);
 }
+static inline struct drm_mm_node *drm_mm_get_block_range(
+						struct drm_mm_node *parent,
+						unsigned long size,
+						unsigned alignment,
+						unsigned long start,
+						unsigned long end)
+{
+	return drm_mm_get_block_range_generic(parent, size, alignment,
+						start, end, 0);
+}
+static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
+						struct drm_mm_node *parent,
+						unsigned long size,
+						unsigned alignment,
+						unsigned long start,
+						unsigned long end)
+{
+	return drm_mm_get_block_range_generic(parent, size, alignment,
+						start, end, 1);
+}
 extern void drm_mm_put_block(struct drm_mm_node *cur);
 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 					      unsigned long size,
 					      unsigned alignment,
 					      int best_match);
+extern struct drm_mm_node *drm_mm_search_free_in_range(
+						const struct drm_mm *mm,
+						unsigned long size,
+						unsigned alignment,
+						unsigned long start,
+						unsigned long end,
+						int best_match);
 extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
 		       unsigned long size);
 extern void drm_mm_takedown(struct drm_mm *mm);