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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: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Airlie <airlied@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-11-15 11:32:16 +00:00 committed by Daniel Vetter
parent acd15b6cc2
commit 5973c7ee51
2 changed files with 54 additions and 0 deletions
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50
drivers/gpu/drm/drm_mm.c
View File

@ -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,

4
include/drm/drm_mm.h
View File

@ -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,