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drm: Optimize drm buddy top-down allocation method

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We are observing performance drop in many usecases which include
games, 3D benchmark applications,etc.. To solve this problem, We
are strictly not allowing top down flag enabled allocations to
steal the memory space from cpu visible region.

The idea is, we are sorting each order list entries in
ascending order and compare the last entry of each order
list in the freelist and return the max block.

This patch improves the 3D benchmark scores and solves
fragmentation issues.

All drm buddy selftests are verfied.
drm_buddy: pass:6 fail:0 skip:0 total:6

Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230112120027.3072-1-Arunpravin.PaneerSelvam@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>
CC: Cc: stable@vger.kernel.org # 5.18+
This commit is contained in:
Arunpravin Paneer Selvam 2023-01-12 04:00:27 -08:00 committed by Christian König
parent 040b35c19b
commit 5640e81607
1 changed files with 54 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
drivers/gpu/drm/drm_buddy.c
View File

@ -38,6 +38,25 @@ static void drm_block_free(struct drm_buddy *mm,
kmem_cache_free(slab_blocks, block);
}
static void list_insert_sorted(struct drm_buddy *mm,
struct drm_buddy_block *block)
{
struct drm_buddy_block *node;
struct list_head *head;
head = &mm->free_list[drm_buddy_block_order(block)];
if (list_empty(head)) {
list_add(&block->link, head);
return;
}
list_for_each_entry(node, head, link)
if (drm_buddy_block_offset(block) < drm_buddy_block_offset(node))
break;
__list_add(&block->link, node->link.prev, &node->link);
}
static void mark_allocated(struct drm_buddy_block *block)
{
block->header &= ~DRM_BUDDY_HEADER_STATE;
@ -52,8 +71,7 @@ static void mark_free(struct drm_buddy *mm,
block->header &= ~DRM_BUDDY_HEADER_STATE;
block->header |= DRM_BUDDY_FREE;
list_add(&block->link,
&mm->free_list[drm_buddy_block_order(block)]);
list_insert_sorted(mm, block);
}
static void mark_split(struct drm_buddy_block *block)
@ -387,20 +405,26 @@ err_undo:
}
static struct drm_buddy_block *
get_maxblock(struct list_head *head)
get_maxblock(struct drm_buddy *mm, unsigned int order)
{
struct drm_buddy_block *max_block = NULL, *node;
unsigned int i;
max_block = list_first_entry_or_null(head,
struct drm_buddy_block,
link);
if (!max_block)
return NULL;
for (i = order; i <= mm->max_order; ++i) {
if (!list_empty(&mm->free_list[i])) {
node = list_last_entry(&mm->free_list[i],
struct drm_buddy_block,
link);
if (!max_block) {
max_block = node;
continue;
}
list_for_each_entry(node, head, link) {
if (drm_buddy_block_offset(node) >
drm_buddy_block_offset(max_block))
max_block = node;
if (drm_buddy_block_offset(node) >
drm_buddy_block_offset(max_block)) {
max_block = node;
}
}
}
return max_block;
@ -412,20 +436,23 @@ alloc_from_freelist(struct drm_buddy *mm,
unsigned long flags)
{
struct drm_buddy_block *block = NULL;
unsigned int i;
unsigned int tmp;
int err;
for (i = order; i <= mm->max_order; ++i) {
if (flags & DRM_BUDDY_TOPDOWN_ALLOCATION) {
block = get_maxblock(&mm->free_list[i]);
if (block)
break;
} else {
block = list_first_entry_or_null(&mm->free_list[i],
struct drm_buddy_block,
link);
if (block)
break;
if (flags & DRM_BUDDY_TOPDOWN_ALLOCATION) {
block = get_maxblock(mm, order);
if (block)
/* Store the obtained block order */
tmp = drm_buddy_block_order(block);
} else {
for (tmp = order; tmp <= mm->max_order; ++tmp) {
if (!list_empty(&mm->free_list[tmp])) {
block = list_last_entry(&mm->free_list[tmp],
struct drm_buddy_block,
link);
if (block)
break;
}
}
}
@ -434,18 +461,18 @@ alloc_from_freelist(struct drm_buddy *mm,
BUG_ON(!drm_buddy_block_is_free(block));
while (i != order) {
while (tmp != order) {
err = split_block(mm, block);
if (unlikely(err))
goto err_undo;
block = block->right;
i--;
tmp--;
}
return block;
err_undo:
if (i != order)
if (tmp != order)
__drm_buddy_free(mm, block);
return ERR_PTR(err);
}