ttm: Provide an API for starting and stopping the delayed workqueue

We want to be able to prevent the delayed workqueue from changing state
while we're reclocking, so add an API to block and unblock it.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 3b5b094b1397ab75e01ee97ca538ff47076beed3..4c2299299ab2c2499f61b04df252615639f158fd 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -604,6 +604,20 @@ void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 }
 EXPORT_SYMBOL(ttm_bo_unref);
 
+int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
+{
+       return cancel_delayed_work_sync(&bdev->wq);
+}
+EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
+
+void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
+{
+       if (resched)
+               schedule_delayed_work(&bdev->wq,
+                                     ((HZ / 100) < 1) ? 1 : HZ / 100);
+}
+EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
+
 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
                        bool no_wait_reserve, bool no_wait_gpu)
 {

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 3e273e0b9417eed6f430963cfd679669a4f6daf1..267a86c74e2e5cc089dfb5c72a1f1da3dbdae721 100644 (file)
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -361,6 +361,23 @@ extern int ttm_bo_validate(struct ttm_buffer_object *bo,
  */
 extern void ttm_bo_unref(struct ttm_buffer_object **bo);
 
+/**
+ * ttm_bo_lock_delayed_workqueue
+ *
+ * Prevent the delayed workqueue from running.
+ * Returns
+ * True if the workqueue was queued at the time
+ */
+extern int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev);
+
+/**
+ * ttm_bo_unlock_delayed_workqueue
+ *
+ * Allows the delayed workqueue to run.
+ */
+extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev,
+                                           int resched);
+
 /**
  * ttm_bo_synccpu_write_grab
  *