To be used later by i915 to preallocate exact blocks of space from the range manager.

Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Dave Airlie airlied@redhat.com Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/drm_mm.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_mm.h | 4 ++++ 2 files changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 0761a03..bd203b6 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -161,6 +161,56 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node, } }

+struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm, + unsigned long start, + unsigned long size, + bool atomic) +{ + struct drm_mm_node *hole, *node; + unsigned long end = start + size; + + list_for_each_entry(hole, &mm->hole_stack, hole_stack) { + unsigned long hole_start; + unsigned long hole_end; + + BUG_ON(!hole->hole_follows); + hole_start = drm_mm_hole_node_start(hole); + hole_end = drm_mm_hole_node_end(hole); + + if (hole_start > start || hole_end < end) + continue; + + node = drm_mm_kmalloc(mm, atomic); + if (unlikely(node == NULL)) + return NULL; + + node->start = start; + node->size = size; + node->mm = mm; + node->allocated = 1; + + INIT_LIST_HEAD(&node->hole_stack); + list_add(&node->node_list, &hole->node_list); + + if (start == hole_start) { + hole->hole_follows = 0; + list_del_init(&hole->hole_stack); + } + + node->hole_follows = 0; + if (end != hole_end) { + list_add(&node->hole_stack, &mm->hole_stack); + node->hole_follows = 1; + } + + return node; + } + + WARN(1, "no hole found for block 0x%lx + 0x%lx\n", start, size); + return NULL; +} +EXPORT_SYMBOL(drm_mm_create_block); + struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node, unsigned long size, unsigned alignment, diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h index 06d7f79..4020f96 100644 --- a/include/drm/drm_mm.h +++ b/include/drm/drm_mm.h @@ -102,6 +102,10 @@ static inline bool drm_mm_initialized(struct drm_mm *mm) /* * Basic range manager support (drm_mm.c) */ +extern struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm, + unsigned long start, + unsigned long size, + bool atomic); extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node, unsigned long size, unsigned alignment,