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* [PATCH v4] drm/msm: validate display and event threads
@ 2018-10-10 21:11 Jeykumar Sankaran
       [not found] ` <1539205876-23732-1-git-send-email-jsanka-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
  0 siblings, 1 reply; 2+ messages in thread
From: Jeykumar Sankaran @ 2018-10-10 21:11 UTC (permalink / raw)
  To: dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
	freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
	linux-arm-msm-u79uwXL29TY76Z2rM5mHXA
  Cc: abhinavk-sgV2jX0FEOL9JmXXK+q4OQ, robdclark-Re5JQEeQqe8AvxtiuMwx3w,
	hoegsberg-hpIqsD4AKlfQT0dZR+AlfA, seanpaul-F7+t8E8rja9g9hUCZPvPmw,
	Jeykumar Sankaran, dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA

While creating display and event threads per crtc, validate
them before setting their priorities.

changes in v2:
	- use dev_warn (Abhinav Kumar)
changes in v3:
	- fix compilation error
changes in v4:
	- Remove Change-Id (Sean Paul)
	- Keep logging within 80 char limit (Sean Paul)

Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 49 ++++++++++++++-----------------------------
 1 file changed, 16 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 4904d0d..dcff812 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -553,17 +553,18 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 			kthread_run(kthread_worker_fn,
 				&priv->disp_thread[i].worker,
 				"crtc_commit:%d", priv->disp_thread[i].crtc_id);
-		ret = sched_setscheduler(priv->disp_thread[i].thread,
-							SCHED_FIFO, &param);
-		if (ret)
-			pr_warn("display thread priority update failed: %d\n",
-									ret);
-
 		if (IS_ERR(priv->disp_thread[i].thread)) {
 			dev_err(dev, "failed to create crtc_commit kthread\n");
 			priv->disp_thread[i].thread = NULL;
+			goto err_msm_uninit;
 		}
 
+		ret = sched_setscheduler(priv->disp_thread[i].thread,
+					 SCHED_FIFO, &param);
+		if (ret)
+			dev_warn(dev, "disp_thread set priority failed: %d\n",
+				 ret);
+
 		/* initialize event thread */
 		priv->event_thread[i].crtc_id = priv->crtcs[i]->base.id;
 		kthread_init_worker(&priv->event_thread[i].worker);
@@ -572,6 +573,12 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 			kthread_run(kthread_worker_fn,
 				&priv->event_thread[i].worker,
 				"crtc_event:%d", priv->event_thread[i].crtc_id);
+		if (IS_ERR(priv->event_thread[i].thread)) {
+			dev_err(dev, "failed to create crtc_event kthread\n");
+			priv->event_thread[i].thread = NULL;
+			goto err_msm_uninit;
+		}
+
 		/**
 		 * event thread should also run at same priority as disp_thread
 		 * because it is handling frame_done events. A lower priority
@@ -580,34 +587,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 		 * failure at crtc commit level.
 		 */
 		ret = sched_setscheduler(priv->event_thread[i].thread,
-							SCHED_FIFO, &param);
+					 SCHED_FIFO, &param);
 		if (ret)
-			pr_warn("display event thread priority update failed: %d\n",
-									ret);
-
-		if (IS_ERR(priv->event_thread[i].thread)) {
-			dev_err(dev, "failed to create crtc_event kthread\n");
-			priv->event_thread[i].thread = NULL;
-		}
-
-		if ((!priv->disp_thread[i].thread) ||
-				!priv->event_thread[i].thread) {
-			/* clean up previously created threads if any */
-			for ( ; i >= 0; i--) {
-				if (priv->disp_thread[i].thread) {
-					kthread_stop(
-						priv->disp_thread[i].thread);
-					priv->disp_thread[i].thread = NULL;
-				}
-
-				if (priv->event_thread[i].thread) {
-					kthread_stop(
-						priv->event_thread[i].thread);
-					priv->event_thread[i].thread = NULL;
-				}
-			}
-			goto err_msm_uninit;
-		}
+			dev_warn(dev, "event_thread set priority failed:%d\n",
+				 ret);
 	}
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

_______________________________________________
Freedreno mailing list
Freedreno@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/freedreno

^ permalink raw reply related	[flat|nested] 2+ messages in thread
* Re: [PATCH v4] drm/msm: validate display and event threads
       [not found] ` <1539205876-23732-1-git-send-email-jsanka-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
@ 2018-10-11 15:17   ` Sean Paul
  0 siblings, 0 replies; 2+ messages in thread
From: Sean Paul @ 2018-10-11 15:17 UTC (permalink / raw)
  To: Jeykumar Sankaran
  Cc: linux-arm-msm-u79uwXL29TY76Z2rM5mHXA,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
	robdclark-Re5JQEeQqe8AvxtiuMwx3w, seanpaul-F7+t8E8rja9g9hUCZPvPmw,
	abhinavk-sgV2jX0FEOL9JmXXK+q4OQ, hoegsberg-hpIqsD4AKlfQT0dZR+AlfA,
	freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
	dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA

On Wed, Oct 10, 2018 at 02:11:16PM -0700, Jeykumar Sankaran wrote:
> While creating display and event threads per crtc, validate
> them before setting their priorities.
> 
> changes in v2:
> 	- use dev_warn (Abhinav Kumar)
> changes in v3:
> 	- fix compilation error
> changes in v4:
> 	- Remove Change-Id (Sean Paul)
> 	- Keep logging within 80 char limit (Sean Paul)
> 
> Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

I'll push to dpu-staging

Thanks!

Sean

> ---
>  drivers/gpu/drm/msm/msm_drv.c | 49 ++++++++++++++-----------------------------
>  1 file changed, 16 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 4904d0d..dcff812 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -553,17 +553,18 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>  			kthread_run(kthread_worker_fn,
>  				&priv->disp_thread[i].worker,
>  				"crtc_commit:%d", priv->disp_thread[i].crtc_id);
> -		ret = sched_setscheduler(priv->disp_thread[i].thread,
> -							SCHED_FIFO, &param);
> -		if (ret)
> -			pr_warn("display thread priority update failed: %d\n",
> -									ret);
> -
>  		if (IS_ERR(priv->disp_thread[i].thread)) {
>  			dev_err(dev, "failed to create crtc_commit kthread\n");
>  			priv->disp_thread[i].thread = NULL;
> +			goto err_msm_uninit;
>  		}
>  
> +		ret = sched_setscheduler(priv->disp_thread[i].thread,
> +					 SCHED_FIFO, &param);
> +		if (ret)
> +			dev_warn(dev, "disp_thread set priority failed: %d\n",
> +				 ret);
> +
>  		/* initialize event thread */
>  		priv->event_thread[i].crtc_id = priv->crtcs[i]->base.id;
>  		kthread_init_worker(&priv->event_thread[i].worker);
> @@ -572,6 +573,12 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>  			kthread_run(kthread_worker_fn,
>  				&priv->event_thread[i].worker,
>  				"crtc_event:%d", priv->event_thread[i].crtc_id);
> +		if (IS_ERR(priv->event_thread[i].thread)) {
> +			dev_err(dev, "failed to create crtc_event kthread\n");
> +			priv->event_thread[i].thread = NULL;
> +			goto err_msm_uninit;
> +		}
> +
>  		/**
>  		 * event thread should also run at same priority as disp_thread
>  		 * because it is handling frame_done events. A lower priority
> @@ -580,34 +587,10 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>  		 * failure at crtc commit level.
>  		 */
>  		ret = sched_setscheduler(priv->event_thread[i].thread,
> -							SCHED_FIFO, &param);
> +					 SCHED_FIFO, &param);
>  		if (ret)
> -			pr_warn("display event thread priority update failed: %d\n",
> -									ret);
> -
> -		if (IS_ERR(priv->event_thread[i].thread)) {
> -			dev_err(dev, "failed to create crtc_event kthread\n");
> -			priv->event_thread[i].thread = NULL;
> -		}
> -
> -		if ((!priv->disp_thread[i].thread) ||
> -				!priv->event_thread[i].thread) {
> -			/* clean up previously created threads if any */
> -			for ( ; i >= 0; i--) {
> -				if (priv->disp_thread[i].thread) {
> -					kthread_stop(
> -						priv->disp_thread[i].thread);
> -					priv->disp_thread[i].thread = NULL;
> -				}
> -
> -				if (priv->event_thread[i].thread) {
> -					kthread_stop(
> -						priv->event_thread[i].thread);
> -					priv->event_thread[i].thread = NULL;
> -				}
> -			}
> -			goto err_msm_uninit;
> -		}
> +			dev_warn(dev, "event_thread set priority failed:%d\n",
> +				 ret);
>  	}
>  
>  	ret = drm_vblank_init(ddev, priv->num_crtcs);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
_______________________________________________
Freedreno mailing list
Freedreno@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/freedreno

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2018-10-10 21:11 [PATCH v4] drm/msm: validate display and event threads Jeykumar Sankaran
     [not found] ` <1539205876-23732-1-git-send-email-jsanka-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-10-11 15:17   ` Sean Paul

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