drm/nouveau/core/mm: introduce functions to access info about a given allocation

These will be used in upcoming patches.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/core/mm.h

@@ -39,9 +39,39 @@ int  nvkm_mm_tail(struct nvkm_mm *, u8 heap, u8 type, u32 size_max,
 void nvkm_mm_free(struct nvkm_mm *, struct nvkm_mm_node **);
 void nvkm_mm_dump(struct nvkm_mm *, const char *);
 
+static inline u32
+nvkm_mm_heap_size(struct nvkm_mm *mm, u8 heap)
+{
+	struct nvkm_mm_node *node;
+	u32 size = 0;
+	list_for_each_entry(node, &mm->nodes, nl_entry) {
+		if (node->heap == heap)
+			size += node->length;
+	}
+	return size;
+}
+
 static inline bool
 nvkm_mm_contiguous(struct nvkm_mm_node *node)
 {
 	return !node->next;
 }
+
+static inline u32
+nvkm_mm_addr(struct nvkm_mm_node *node)
+{
+	if (WARN_ON(!nvkm_mm_contiguous(node)))
+		return 0;
+	return node->offset;
+}
+
+static inline u32
+nvkm_mm_size(struct nvkm_mm_node *node)
+{
+	u32 size = 0;
+	do {
+		size += node->length;
+	} while ((node = node->next));
+	return size;
+}
 #endif