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drm/ttm: Improved fencing of buffer object lists 

Drastically reduce the number of spin lock / unlock operations by performing
unreserving and fencing under global locks.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jerome Glisse <j.glisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2010-11-17 12:28:30 +00:00 committed by Dave Airlie
parent 702adba224
commit 95762c2b34
4 changed files with 45 additions and 14 deletions
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11
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -299,14 +299,19 @@ int ttm_bo_reserve(struct ttm_buffer_object *bo,
return ret;
}
void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
{
ttm_bo_add_to_lru(bo);
atomic_set(&bo->reserved, 0);
wake_up_all(&bo->event_queue);
}
void ttm_bo_unreserve(struct ttm_buffer_object *bo)
{
struct ttm_bo_global *glob = bo->glob;
spin_lock(&glob->lru_lock);
ttm_bo_add_to_lru(bo);
atomic_set(&bo->reserved, 0);
wake_up_all(&bo->event_queue);
ttm_bo_unreserve_locked(bo);
spin_unlock(&glob->lru_lock);
}
EXPORT_SYMBOL(ttm_bo_unreserve);

36
drivers/gpu/drm/ttm/ttm_execbuf_util.c
View File

@ -200,22 +200,36 @@ EXPORT_SYMBOL(ttm_eu_reserve_buffers);
void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
{
struct ttm_validate_buffer *entry;
struct ttm_buffer_object *bo;
struct ttm_bo_global *glob;
struct ttm_bo_device *bdev;
struct ttm_bo_driver *driver;
if (list_empty(list))
return;
bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
bdev = bo->bdev;
driver = bdev->driver;
glob = bo->glob;
spin_lock(&bdev->fence_lock);
spin_lock(&glob->lru_lock);
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_driver *driver = bdev->driver;
void *old_sync_obj;
spin_lock(&bdev->fence_lock);
old_sync_obj = bo->sync_obj;
bo = entry->bo;
entry->old_sync_obj = bo->sync_obj;
bo->sync_obj = driver->sync_obj_ref(sync_obj);
bo->sync_obj_arg = entry->new_sync_obj_arg;
spin_unlock(&bdev->fence_lock);
ttm_bo_unreserve(bo);
ttm_bo_unreserve_locked(bo);
entry->reserved = false;
if (old_sync_obj)
driver->sync_obj_unref(&old_sync_obj);
}
spin_unlock(&glob->lru_lock);
spin_unlock(&bdev->fence_lock);
list_for_each_entry(entry, list, head) {
if (entry->old_sync_obj)
driver->sync_obj_unref(&entry->old_sync_obj);
}
}
EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);

10
include/drm/ttm/ttm_bo_driver.h
View File

@ -909,6 +909,16 @@ extern int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
*/
extern void ttm_bo_unreserve(struct ttm_buffer_object *bo);
/**
* ttm_bo_unreserve_locked
*
* @bo: A pointer to a struct ttm_buffer_object.
*
* Unreserve a previous reservation of @bo.
* Needs to be called with struct ttm_bo_global::lru_lock held.
*/
extern void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo);
/**
* ttm_bo_wait_unreserved
*

2
include/drm/ttm/ttm_execbuf_util.h
View File

@ -44,6 +44,7 @@
* @reserved: Indicates whether @bo has been reserved for validation.
* @removed: Indicates whether @bo has been removed from lru lists.
* @put_count: Number of outstanding references on bo::list_kref.
* @old_sync_obj: Pointer to a sync object about to be unreferenced
*/
struct ttm_validate_buffer {
@ -53,6 +54,7 @@ struct ttm_validate_buffer {
bool reserved;
bool removed;
int put_count;
void *old_sync_obj;
};
/**