drm: Move modeset_lock_all helpers to drm_modeset_lock.[hc]
Somehow we've forgotten about this little bit of OCD.
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 0dc57d5..73e6534 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -57,6 +57,101 @@
/**
+ * drm_modeset_lock_all - take all modeset locks
+ * @dev: drm device
+ *
+ * This function takes all modeset locks, suitable where a more fine-grained
+ * scheme isn't (yet) implemented. Locks must be dropped with
+ * drm_modeset_unlock_all.
+ */
+void drm_modeset_lock_all(struct drm_device *dev)
+{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_modeset_acquire_ctx *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (WARN_ON(!ctx))
+ return;
+
+ mutex_lock(&config->mutex);
+
+ drm_modeset_acquire_init(ctx, 0);
+
+retry:
+ ret = drm_modeset_lock(&config->connection_mutex, ctx);
+ if (ret)
+ goto fail;
+ ret = drm_modeset_lock_all_crtcs(dev, ctx);
+ if (ret)
+ goto fail;
+
+ WARN_ON(config->acquire_ctx);
+
+ /* now we hold the locks, so now that it is safe, stash the
+ * ctx for drm_modeset_unlock_all():
+ */
+ config->acquire_ctx = ctx;
+
+ drm_warn_on_modeset_not_all_locked(dev);
+
+ return;
+
+fail:
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(ctx);
+ goto retry;
+ }
+}
+EXPORT_SYMBOL(drm_modeset_lock_all);
+
+/**
+ * drm_modeset_unlock_all - drop all modeset locks
+ * @dev: device
+ *
+ * This function drop all modeset locks taken by drm_modeset_lock_all.
+ */
+void drm_modeset_unlock_all(struct drm_device *dev)
+{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
+
+ if (WARN_ON(!ctx))
+ return;
+
+ config->acquire_ctx = NULL;
+ drm_modeset_drop_locks(ctx);
+ drm_modeset_acquire_fini(ctx);
+
+ kfree(ctx);
+
+ mutex_unlock(&dev->mode_config.mutex);
+}
+EXPORT_SYMBOL(drm_modeset_unlock_all);
+
+/**
+ * drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
+ * @dev: device
+ *
+ * Useful as a debug assert.
+ */
+void drm_warn_on_modeset_not_all_locked(struct drm_device *dev)
+{
+ struct drm_crtc *crtc;
+
+ /* Locking is currently fubar in the panic handler. */
+ if (oops_in_progress)
+ return;
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+ WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
+ WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+ WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+}
+EXPORT_SYMBOL(drm_warn_on_modeset_not_all_locked);
+
+/**
* drm_modeset_acquire_init - initialize acquire context
* @ctx: the acquire context
* @flags: for future