drm/atomic: Rename async parameter to nonblocking.

This is the first step of renaming async commit to nonblocking commit.
The flag passed by userspace is NONBLOCKING, and async has a different
meaning for page flips, where it means as soon as possible.

Fixing up comments in drm core is done manually, to make sure I didn't
miss anything.

For drivers, the following cocci script is used to rename bool async to bool
nonblock:
@@
identifier I =~ "^async";
identifier func;
@@
func(..., bool
- I
+ nonblock
, ...)
{
<...
- I
+ nonblock
...>
}
@@
identifier func;
type T;
identifier I =~ "^async";
@@
T func(..., bool
- I
+ nonblock
, ...);

Thanks to Tvrtko Ursulin for the cocci script.

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461679905-30177-2-git-send-email-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/drm_atomic_helper.c

@@ -1114,13 +1114,13 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
  * drm_atomic_helper_commit - commit validated state object
  * @dev: DRM device
  * @state: the driver state object
- * @async: asynchronous commit
+ * @nonblocking: whether nonblocking behavior is requested.
  *
  * This function commits a with drm_atomic_helper_check() pre-validated state
  * object. This can still fail when e.g. the framebuffer reservation fails. For
- * now this doesn't implement asynchronous commits.
+ * now this doesn't implement nonblocking commits.
  *
- * Note that right now this function does not support async commits, and hence
+ * Note that right now this function does not support nonblocking commits, hence
  * driver writers must implement their own version for now. Also note that the
  * default ordering of how the various stages are called is to match the legacy
  * modeset helper library closest. One peculiarity of that is that it doesn't
@@ -1141,11 +1141,11 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
  */
 int drm_atomic_helper_commit(struct drm_device *dev,
 			     struct drm_atomic_state *state,
-			     bool async)
+			     bool nonblock)
 {
 	int ret;
 
-	if (async)
+	if (nonblock)
 		return -EBUSY;
 
 	ret = drm_atomic_helper_prepare_planes(dev, state);
@@ -1195,20 +1195,20 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 EXPORT_SYMBOL(drm_atomic_helper_commit);
 
 /**
- * DOC: implementing async commit
+ * DOC: implementing nonblocking commit
  *
- * For now the atomic helpers don't support async commit directly. If there is
- * real need it could be added though, using the dma-buf fence infrastructure
- * for generic synchronization with outstanding rendering.
+ * For now the atomic helpers don't support nonblocking commit directly. If
+ * there is real need it could be added though, using the dma-buf fence
+ * infrastructure for generic synchronization with outstanding rendering.
  *
- * For now drivers have to implement async commit themselves, with the following
- * sequence being the recommended one:
+ * For now drivers have to implement nonblocking commit themselves, with the
+ * following sequence being the recommended one:
  *
  * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
  * which commit needs to call which can fail, so we want to run it first and
  * synchronously.
  *
- * 2. Synchronize with any outstanding asynchronous commit worker threads which
+ * 2. Synchronize with any outstanding nonblocking commit worker threads which
  * might be affected the new state update. This can be done by either cancelling
  * or flushing the work items, depending upon whether the driver can deal with
  * cancelled updates. Note that it is important to ensure that the framebuffer
@@ -1222,9 +1222,9 @@ EXPORT_SYMBOL(drm_atomic_helper_commit);
  * 3. The software state is updated synchronously with
  * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
  * locks means concurrent callers never see inconsistent state. And doing this
- * while it's guaranteed that no relevant async worker runs means that async
- * workers do not need grab any locks. Actually they must not grab locks, for
- * otherwise the work flushing will deadlock.
+ * while it's guaranteed that no relevant nonblocking worker runs means that
+ * nonblocking workers do not need grab any locks. Actually they must not grab
+ * locks, for otherwise the work flushing will deadlock.
  *
  * 4. Schedule a work item to do all subsequent steps, using the split-out
  * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and

include/drm/drm_atomic_helper.h

@@ -40,7 +40,7 @@ int drm_atomic_helper_check(struct drm_device *dev,
 			    struct drm_atomic_state *state);
 int drm_atomic_helper_commit(struct drm_device *dev,
 			     struct drm_atomic_state *state,
-			     bool async);
+			     bool nonblock);
 
 void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
 					struct drm_atomic_state *state);

include/drm/drm_crtc.h

@@ -1887,7 +1887,7 @@ struct drm_mode_config_funcs {
 	 * drm_atomic_helper_commit(), or one of the exported sub-functions of
 	 * it.
 	 *
-	 * Asynchronous commits (as indicated with the async parameter) must
+	 * Nonblocking commits (as indicated with the nonblock parameter) must
 	 * do any preparatory work which might result in an unsuccessful commit
 	 * in the context of this callback. The only exceptions are hardware
 	 * errors resulting in -EIO. But even in that case the driver must
@@ -1900,7 +1900,7 @@ struct drm_mode_config_funcs {
 	 * The driver must wait for any pending rendering to the new
 	 * framebuffers to complete before executing the flip. It should also
 	 * wait for any pending rendering from other drivers if the underlying
-	 * buffer is a shared dma-buf. Asynchronous commits must not wait for
+	 * buffer is a shared dma-buf. Nonblocking commits must not wait for
 	 * rendering in the context of this callback.
 	 *
 	 * An application can request to be notified when the atomic commit has
@@ -1931,7 +1931,7 @@ struct drm_mode_config_funcs {
 	 *
 	 * 0 on success or one of the below negative error codes:
 	 *
-	 *  - -EBUSY, if an asynchronous updated is requested and there is
+	 *  - -EBUSY, if a nonblocking updated is requested and there is
 	 *    an earlier updated pending. Drivers are allowed to support a queue
 	 *    of outstanding updates, but currently no driver supports that.
 	 *    Note that drivers must wait for preceding updates to complete if a
@@ -1961,7 +1961,7 @@ struct drm_mode_config_funcs {
 	 */
 	int (*atomic_commit)(struct drm_device *dev,
 			     struct drm_atomic_state *state,
-			     bool async);
+			     bool nonblock);
 
 	/**
 	 * @atomic_state_alloc: