Needed for the next patch.
v2: actually predicate all unlocks
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 59 +++++++++++++++++++++++++-------------------
1 file changed, 33 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index db0f670911ec..691646c0f8d3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -486,20 +486,21 @@ static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
}
/**
- * function ttm_bo_cleanup_refs_and_unlock
+ * function ttm_bo_cleanup_refs
* If bo idle, remove from delayed- and lru lists, and unref.
* If not idle, do nothing.
*
* Must be called with lru_lock and reservation held, this function
- * will drop both before returning.
+ * will drop the lru lock and optionally the reservation lock before returning.
*
* @interruptible Any sleeps should occur interruptibly.
* @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
+ * @unlock_resv Unlock the reservation lock as well.
*/
-static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
- bool interruptible,
- bool no_wait_gpu)
+static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
+ bool interruptible, bool no_wait_gpu,
+ bool unlock_resv)
{
struct ttm_bo_global *glob = bo->glob;
struct reservation_object *resv;
@@ -518,7 +519,8 @@ static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
if (ret && !no_wait_gpu) {
long lret;
- reservation_object_unlock(bo->resv);
+ if (unlock_resv)
+ reservation_object_unlock(bo->resv);
spin_unlock(&glob->lru_lock);
lret = reservation_object_wait_timeout_rcu(resv, true,
@@ -531,24 +533,28 @@ static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
return -EBUSY;
spin_lock(&glob->lru_lock);
- ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
-
- /*
- * We raced, and lost, someone else holds the reservation now,
- * and is probably busy in ttm_bo_cleanup_memtype_use.
- *
- * Even if it's not the case, because we finished waiting any
- * delayed destruction would succeed, so just return success
- * here.
- */
- if (ret) {
- spin_unlock(&glob->lru_lock);
- return 0;
+ if (unlock_resv) {
+ ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
+ /*
+ * We raced, and lost, someone else holds the reservation now,
+ * and is probably busy in ttm_bo_cleanup_memtype_use.
+ *
+ * Even if it's not the case, because we finished waiting any
+ * delayed destruction would succeed, so just return success
+ * here.
+ */
+ if (ret) {
+ spin_unlock(&glob->lru_lock);
+ return 0;
+ }
+ } else {
+ ret = 0;
}
}
if (ret || unlikely(list_empty(&bo->ddestroy))) {
- reservation_object_unlock(bo->resv);
+ if (unlock_resv)
+ reservation_object_unlock(bo->resv);
spin_unlock(&glob->lru_lock);
return ret;
}
@@ -559,7 +565,9 @@ static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
spin_unlock(&glob->lru_lock);
ttm_bo_cleanup_memtype_use(bo);
- reservation_object_unlock(bo->resv);
+
+ if (unlock_resv)
+ reservation_object_unlock(bo->resv);
return 0;
}
@@ -600,8 +608,8 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
}
if (!ret)
- ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
- !remove_all);
+ ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
+ true);
else
spin_unlock(&glob->lru_lock);
@@ -770,8 +778,7 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
kref_get(&bo->list_kref);
if (!list_empty(&bo->ddestroy)) {
- ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
- no_wait_gpu);
+ ret = ttm_bo_cleanup_refs(bo, interruptible, no_wait_gpu, true);
kref_put(&bo->list_kref, ttm_bo_release_list);
return ret;
}
@@ -1735,7 +1742,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
kref_get(&bo->list_kref);
if (!list_empty(&bo->ddestroy)) {
- ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
+ ret = ttm_bo_cleanup_refs(bo, false, false, true);
kref_put(&bo->list_kref, ttm_bo_release_list);
return ret;
}
--
2.11.0
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