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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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93
drivers/gpu/drm/drm_mm.c
View File

@ -124,6 +124,8 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
unsigned long hole_start = drm_mm_hole_node_start(hole_node);
unsigned long hole_end = drm_mm_hole_node_end(hole_node);
BUG_ON(!hole_node->hole_follows || node->allocated);
if (alignment)
tmp = hole_start % alignment;
@ -136,6 +138,7 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
node->start = hole_start + wasted;
node->size = size;
node->mm = mm;
node->allocated = 1;
INIT_LIST_HEAD(&node->hole_stack);
list_add(&node->node_list, &hole_node->node_list);
@ -157,8 +160,6 @@ struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
{
struct drm_mm_node *node;
BUG_ON(!hole_node->hole_follows);
node = drm_mm_kmalloc(hole_node->mm, atomic);
if (unlikely(node == NULL))
return NULL;
@ -169,6 +170,26 @@ struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
}
EXPORT_SYMBOL(drm_mm_get_block_generic);
/**
* Search for free space and insert a preallocated memory node. Returns
* -ENOSPC if no suitable free area is available. The preallocated memory node
* must be cleared.
*/
int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
unsigned long size, unsigned alignment)
{
struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free(mm, size, alignment, 0);
if (!hole_node)
return -ENOSPC;
drm_mm_insert_helper(hole_node, node, size, alignment);
return 0;
}
EXPORT_SYMBOL(drm_mm_insert_node);
static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
struct drm_mm_node *node,
unsigned long size, unsigned alignment,
@ -179,6 +200,8 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
unsigned long hole_start = drm_mm_hole_node_start(hole_node);
unsigned long hole_end = drm_mm_hole_node_end(hole_node);
BUG_ON(!hole_node->hole_follows || node->allocated);
if (hole_start < start)
wasted += start - hole_start;
if (alignment)
@ -195,6 +218,7 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
node->start = hole_start + wasted;
node->size = size;
node->mm = mm;
node->allocated = 1;
INIT_LIST_HEAD(&node->hole_stack);
list_add(&node->node_list, &hole_node->node_list);
@ -219,8 +243,6 @@ struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *hole_node
{
struct drm_mm_node *node;
BUG_ON(!hole_node->hole_follows);
node = drm_mm_kmalloc(hole_node->mm, atomic);
if (unlikely(node == NULL))
return NULL;
@ -232,14 +254,34 @@ struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *hole_node
}
EXPORT_SYMBOL(drm_mm_get_block_range_generic);
/*
* Put a block. Merge with the previous and / or next block if they are free.
* Otherwise add to the free stack.
/**
* Search for free space and insert a preallocated memory node. Returns
* -ENOSPC if no suitable free area is available. This is for range
* restricted allocations. The preallocated memory node must be cleared.
*/
void drm_mm_put_block(struct drm_mm_node *node)
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)
{
struct drm_mm_node *hole_node;
hole_node = drm_mm_search_free_in_range(mm, size, alignment,
start, end, 0);
if (!hole_node)
return -ENOSPC;
drm_mm_insert_helper_range(hole_node, node, size, alignment,
start, end);
return 0;
}
EXPORT_SYMBOL(drm_mm_insert_node_in_range);
/**
* Remove a memory node from the allocator.
*/
void drm_mm_remove_node(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
struct drm_mm_node *prev_node;
@ -264,6 +306,22 @@ void drm_mm_put_block(struct drm_mm_node *node)
list_move(&prev_node->hole_stack, &mm->hole_stack);
list_del(&node->node_list);
node->allocated = 0;
}
EXPORT_SYMBOL(drm_mm_remove_node);
/*
* Remove a memory node from the allocator and free the allocated struct
* drm_mm_node. Only to be used on a struct drm_mm_node obtained by one of the
* drm_mm_get_block functions.
*/
void drm_mm_put_block(struct drm_mm_node *node)
{
struct drm_mm *mm = node->mm;
drm_mm_remove_node(node);
spin_lock(&mm->unused_lock);
if (mm->num_unused < MM_UNUSED_TARGET) {
list_add(&node->node_list, &mm->unused_nodes);
@ -367,6 +425,23 @@ struct drm_mm_node *drm_mm_search_free_in_range(const struct drm_mm *mm,
}
EXPORT_SYMBOL(drm_mm_search_free_in_range);
/**
* Moves an allocation. To be used with embedded struct drm_mm_node.
*/
void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
{
list_replace(&old->node_list, &new->node_list);
list_replace(&old->node_list, &new->hole_stack);
new->hole_follows = old->hole_follows;
new->mm = old->mm;
new->start = old->start;
new->size = old->size;
old->allocated = 0;
new->allocated = 1;
}
EXPORT_SYMBOL(drm_mm_replace_node);
/**
* Initializa lru scanning.
*

19
include/drm/drm_mm.h
View File

@ -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)