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drm: mm: add api for embedding struct drm_mm_node

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The old api has a two-step process: First search for a suitable
free hole, then allocate from that specific hole. No user used
this to do anything clever. So drop it for the embeddable variant
of the drm_mm api (the old one retains this ability, for the time
being).

With struct drm_mm_node embedded, we cannot track allocations
anymore by checking for a NULL pointer. So keep track of this
and add a small helper drm_mm_node_allocated.

Also add a function to move allocations between different struct
drm_mm_node.

v2: Implement suggestions by Chris Wilson.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Daniel Vetter
2011-02-18 17:59:14 +01:00
committed by Dave Airlie
parent 9fc935debb
commit b0b7af1884
2 changed files with 98 additions and 14 deletions
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19
include/drm/drm_mm.h
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@@ -49,6 +49,7 @@ struct drm_mm_node {
unsigned scanned_prev_free : 1;
unsigned scanned_next_free : 1;
unsigned scanned_preceeds_hole : 1;
unsigned allocated : 1;
unsigned long start;
unsigned long size;
struct drm_mm *mm;
@@ -73,6 +74,11 @@ struct drm_mm {
unsigned long scan_end;
};
static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
{
return node->allocated;
}
static inline bool drm_mm_initialized(struct drm_mm *mm)
{
return mm->hole_stack.next;
@@ -126,7 +132,15 @@ static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
return drm_mm_get_block_range_generic(parent, size, alignment,
start, end, 1);
}
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 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(const struct drm_mm *mm,
unsigned long size,
unsigned alignment,
@@ -142,11 +156,6 @@ extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
unsigned long size);
extern void drm_mm_takedown(struct drm_mm *mm);
extern int drm_mm_clean(struct drm_mm *mm);
extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
unsigned long size);
extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
unsigned long size, int atomic);
extern int drm_mm_pre_get(struct drm_mm *mm);
static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)