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Commit 5973c7ee authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm: Introduce drm_mm_create_block() 



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

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: default avatarDave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent acd15b6c

drivers/gpu/drm/drm_mm.c

+50 −0
Original line number Diff line number Diff line
@@ -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,

include/drm/drm_mm.h

+4 −0
Original line number Diff line number Diff line
@@ -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,