drm/msm: move wq handling to KMS code

The global workqueue is only used for vblanks inside KMS code. Move
allocation / flushing / deallcation of it to msm_kms.c

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/662573/
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>

Author: lumag

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -980,7 +980,7 @@ static int dpu_encoder_resource_control(struct drm_encoder *drm_enc,
 			return 0;
 		}
 
-		queue_delayed_work(priv->wq, &dpu_enc->delayed_off_work,
+		queue_delayed_work(priv->kms->wq, &dpu_enc->delayed_off_work,
 				   msecs_to_jiffies(dpu_enc->idle_timeout));
 
 		trace_dpu_enc_rc(DRMID(drm_enc), sw_event,

drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c

@@ -511,7 +511,7 @@ static void mdp4_crtc_vblank_irq(struct mdp_irq *irq, uint32_t irqstatus)
 
 	if (pending & PENDING_CURSOR) {
 		update_cursor(crtc);
-		drm_flip_work_commit(&mdp4_crtc->unref_cursor_work, priv->wq);
+		drm_flip_work_commit(&mdp4_crtc->unref_cursor_work, priv->kms->wq);
 	}
 }
 

drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c

@@ -1196,7 +1196,7 @@ static void mdp5_crtc_vblank_irq(struct mdp_irq *irq, uint32_t irqstatus)
 	}
 
 	if (pending & PENDING_CURSOR)
-		drm_flip_work_commit(&mdp5_crtc->unref_cursor_work, priv->wq);
+		drm_flip_work_commit(&mdp5_crtc->unref_cursor_work, priv->kms->wq);
 }
 
 static void mdp5_crtc_err_irq(struct mdp_irq *irq, uint32_t irqstatus)

drivers/gpu/drm/msm/msm_drv.c

@@ -77,13 +77,6 @@ static int msm_drm_uninit(struct device *dev)
 			drm_atomic_helper_shutdown(ddev);
 	}
 
-	/* We must cancel and cleanup any pending vblank enable/disable
-	 * work before msm_irq_uninstall() to avoid work re-enabling an
-	 * irq after uninstall has disabled it.
-	 */
-
-	flush_workqueue(priv->wq);
-
 	msm_gem_shrinker_cleanup(ddev);
 
 	msm_perf_debugfs_cleanup(priv);
@@ -97,8 +90,6 @@ static int msm_drm_uninit(struct device *dev)
 	ddev->dev_private = NULL;
 	drm_dev_put(ddev);
 
-	destroy_workqueue(priv->wq);
-
 	return 0;
 }
 
@@ -119,12 +110,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
-	priv->wq = alloc_ordered_workqueue("msm", 0);
-	if (!priv->wq) {
-		ret = -ENOMEM;
-		goto err_put_dev;
-	}
-
 	INIT_LIST_HEAD(&priv->objects);
 	mutex_init(&priv->obj_lock);
 
@@ -149,15 +134,15 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	if (priv->kms_init) {
 		ret = drmm_mode_config_init(ddev);
 		if (ret)
-			goto err_destroy_wq;
+			goto err_put_dev;
 	}
 
 	dma_set_max_seg_size(dev, UINT_MAX);
 
 	/* Bind all our sub-components: */
 	ret = component_bind_all(dev, ddev);
 	if (ret)
-		goto err_destroy_wq;
+		goto err_put_dev;
 
 	ret = msm_gem_shrinker_init(ddev);
 	if (ret)
@@ -194,8 +179,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 
 	return ret;
 
-err_destroy_wq:
-	destroy_workqueue(priv->wq);
 err_put_dev:
 	drm_dev_put(ddev);
 

drivers/gpu/drm/msm/msm_drv.h

@@ -175,8 +175,6 @@ struct msm_drm_private {
 		struct mutex lock;
 	} lru;
 
-	struct workqueue_struct *wq;
-
 	unsigned int num_crtcs;
 
 	struct msm_drm_thread event_thread[MAX_CRTCS];

drivers/gpu/drm/msm/msm_kms.c

@@ -137,7 +137,7 @@ static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
 	vbl_work->enable = enable;
 	vbl_work->priv = priv;
 
-	queue_work(priv->wq, &vbl_work->work);
+	queue_work(priv->kms->wq, &vbl_work->work);
 
 	return 0;
 }
@@ -227,6 +227,13 @@ void msm_drm_kms_uninit(struct device *dev)
 
 	BUG_ON(!kms);
 
+	/* We must cancel and cleanup any pending vblank enable/disable
+	 * work before msm_irq_uninstall() to avoid work re-enabling an
+	 * irq after uninstall has disabled it.
+	 */
+
+	flush_workqueue(kms->wq);
+
 	/* clean up event worker threads */
 	for (i = 0; i < priv->num_crtcs; i++) {
 		if (priv->event_thread[i].worker)
@@ -261,7 +268,7 @@ int msm_drm_kms_init(struct device *dev, const struct drm_driver *drv)
 	ret = priv->kms_init(ddev);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "failed to load kms\n");
-		return ret;
+		goto err_msm_uninit;
 	}
 
 	/* Enable normalization of plane zpos */

drivers/gpu/drm/msm/msm_kms.h

@@ -153,6 +153,8 @@ struct msm_kms {
 	struct mutex commit_lock[MAX_CRTCS];
 	unsigned pending_crtc_mask;
 	struct msm_pending_timer pending_timers[MAX_CRTCS];
+
+	struct workqueue_struct *wq;
 };
 
 static inline int msm_kms_init(struct msm_kms *kms,
@@ -165,6 +167,10 @@ static inline int msm_kms_init(struct msm_kms *kms,
 
 	kms->funcs = funcs;
 
+	kms->wq = alloc_ordered_workqueue("msm", 0);
+	if (!kms->wq)
+		return -ENOMEM;
+
 	for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) {
 		ret = msm_atomic_init_pending_timer(&kms->pending_timers[i], kms, i);
 		if (ret) {
@@ -181,6 +187,8 @@ static inline void msm_kms_destroy(struct msm_kms *kms)
 
 	for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++)
 		msm_atomic_destroy_pending_timer(&kms->pending_timers[i]);
+
+	destroy_workqueue(kms->wq);
 }
 
 #define for_each_crtc_mask(dev, crtc, crtc_mask) \