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>
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index c3a2100..b6da65c 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -200,22 +200,36 @@
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);