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drm_mm: add support for range-restricted fair-lru scans 

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Daniel Vetter 2010-09-16 15:13:11 +02:00 committed by Chris Wilson
parent 3cce469cab
commit d935cc61d4
2 changed files with 46 additions and 1 deletions
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40
drivers/gpu/drm/drm_mm.c
View File

@ -392,9 +392,35 @@ void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
mm->scanned_blocks = 0;
mm->scan_hit_start = 0;
mm->scan_hit_size = 0;
mm->scan_check_range = 0;
}
EXPORT_SYMBOL(drm_mm_init_scan);
/**
* Initializa lru scanning.
*
* This simply sets up the scanning routines with the parameters for the desired
* hole. This version is for range-restricted scans.
*
* Warning: As long as the scan list is non-empty, no other operations than
* adding/removing nodes to/from the scan list are allowed.
*/
void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
unsigned alignment,
unsigned long start,
unsigned long end)
{
mm->scan_alignment = alignment;
mm->scan_size = size;
mm->scanned_blocks = 0;
mm->scan_hit_start = 0;
mm->scan_hit_size = 0;
mm->scan_start = start;
mm->scan_end = end;
mm->scan_check_range = 1;
}
EXPORT_SYMBOL(drm_mm_init_scan_with_range);
/**
* Add a node to the scan list that might be freed to make space for the desired
* hole.
@ -406,6 +432,8 @@ int drm_mm_scan_add_block(struct drm_mm_node *node)
struct drm_mm *mm = node->mm;
struct list_head *prev_free, *next_free;
struct drm_mm_node *prev_node, *next_node;
unsigned long adj_start;
unsigned long adj_end;
mm->scanned_blocks++;
@ -452,7 +480,17 @@ int drm_mm_scan_add_block(struct drm_mm_node *node)
node->free_stack.prev = prev_free;
node->free_stack.next = next_free;
if (check_free_hole(node->start, node->start + node->size,
if (mm->scan_check_range) {
adj_start = node->start < mm->scan_start ?
mm->scan_start : node->start;
adj_end = node->start + node->size > mm->scan_end ?
mm->scan_end : node->start + node->size;
} else {
adj_start = node->start;
adj_end = node->start + node->size;
}
if (check_free_hole(adj_start , adj_end,
mm->scan_size, mm->scan_alignment)) {
mm->scan_hit_start = node->start;
mm->scan_hit_size = node->size;

7
include/drm/drm_mm.h
View File

@ -62,11 +62,14 @@ struct drm_mm {
struct list_head unused_nodes;
int num_unused;
spinlock_t unused_lock;
unsigned int scan_check_range : 1;
unsigned scan_alignment;
unsigned long scan_size;
unsigned long scan_hit_start;
unsigned scan_hit_size;
unsigned scanned_blocks;
unsigned long scan_start;
unsigned long scan_end;
};
/*
@ -145,6 +148,10 @@ static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
unsigned alignment);
void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
unsigned alignment,
unsigned long start,
unsigned long end);
int drm_mm_scan_add_block(struct drm_mm_node *node);
int drm_mm_scan_remove_block(struct drm_mm_node *node);