drm/ttm: convert to the reservation api
Now that the code is compatible in semantics, flip the switch.
Use ww_mutex instead of the homegrown implementation.
ww_mutex uses -EDEADLK to signal that the caller has to back off,
and -EALREADY to indicate this buffer is already held by the caller.
ttm used -EAGAIN and -EDEADLK for those, respectively. So some changes
were needed to handle this correctly.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index af89458..319cf41 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -433,6 +433,7 @@
struct ttm_buffer_object *fbo;
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_driver *driver = bdev->driver;
+ int ret;
fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
if (!fbo)
@@ -445,7 +446,6 @@
* TODO: Explicit member copy would probably be better here.
*/
- init_waitqueue_head(&fbo->event_queue);
INIT_LIST_HEAD(&fbo->ddestroy);
INIT_LIST_HEAD(&fbo->lru);
INIT_LIST_HEAD(&fbo->swap);
@@ -463,6 +463,10 @@
kref_init(&fbo->kref);
fbo->destroy = &ttm_transfered_destroy;
fbo->acc_size = 0;
+ fbo->resv = &fbo->ttm_resv;
+ reservation_object_init(fbo->resv);
+ ret = ww_mutex_trylock(&fbo->resv->lock);
+ WARN_ON(!ret);
*new_obj = fbo;
return 0;