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drm: mm: add helper to unwind scan state 

With the switch to implicit free space accounting one pointer
got unused when scanning. Use it to create a single-linked list
to ensure correct unwinding of the scan state.

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 17:59:15 +01:00 committed by Dave Airlie
parent b0b7af1884
commit ae0cec2880
2 changed files with 12 additions and 0 deletions
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4
drivers/gpu/drm/drm_mm.c
View File

@ -460,6 +460,7 @@ void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
mm->scan_hit_start = 0;
mm->scan_hit_size = 0;
mm->scan_check_range = 0;
mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan);
@ -485,6 +486,7 @@ void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
mm->scan_start = start;
mm->scan_end = end;
mm->scan_check_range = 1;
mm->prev_scanned_node = NULL;
}
EXPORT_SYMBOL(drm_mm_init_scan_with_range);
@ -514,6 +516,8 @@ int drm_mm_scan_add_block(struct drm_mm_node *node)
prev_node->hole_follows = 1;
list_del(&node->node_list);
node->node_list.prev = &prev_node->node_list;
node->node_list.next = &mm->prev_scanned_node->node_list;
mm->prev_scanned_node = node;
hole_start = drm_mm_hole_node_start(prev_node);
hole_end = drm_mm_hole_node_end(prev_node);

8
include/drm/drm_mm.h
View File

@ -72,6 +72,7 @@ struct drm_mm {
unsigned scanned_blocks;
unsigned long scan_start;
unsigned long scan_end;
struct drm_mm_node *prev_scanned_node;
};
static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
@ -86,6 +87,13 @@ static inline bool drm_mm_initialized(struct drm_mm *mm)
#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
&(mm)->head_node.node_list, \
node_list);
#define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \
for (entry = (mm)->prev_scanned_node, \
next = entry ? list_entry(entry->node_list.next, \
struct drm_mm_node, node_list) : NULL; \
entry != NULL; entry = next, \
next = entry ? list_entry(entry->node_list.next, \
struct drm_mm_node, node_list) : NULL) \
/*
* Basic range manager support (drm_mm.c)
*/