Skip to contentSkip to conversation

drm/msm: validate display and event threads

PATCH In review Jeykumar Sankaran 3 participants 3 messages Oct 8, 2018 – Oct 9, 2018 1 message not in the archive

Subsystems (3)
DRM drivers Arm Qualcomm mailing list DRM driver for Qualcomm display hardware
lore
Share & tools
lore

Jeykumar Sankaran

author
#0 lore raw

PATCH v3 1/1 drm/msm: validate display and event threads

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

Change-Id I1dda805286df981c0f0e2b26507d089d3a21ff6c
Signed-off-by Jeykumar Sankaran <[email protected]>
---
 drivers/gpu/drm/msm/msm_drv.c | 49 ++++++++++++++-----------------------------
 1 file changed, 16 insertions(+), 33 deletions(-)
drivers/gpu/drm/msm/msm_drv.c +16 -33
index 4904d0d..ab1b0a9 100644
@@ -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, "display thread priority update 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, "display event thread priority update failed:%d\n",
+				ret);
 	}
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
Signature · 7 lines
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

_______________________________________________
dri-devel mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/dri-devel

A message that is not in the archive (sent off-list or not yet received): 1539042945-28811-1-git-send-email-jsanka-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org

#2 lore raw
Quoted 9 lines · Jeykumar Sankaran

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

Change-Id: I1dda805286df981c0f0e2b26507d089d3a21ff6c

No Change-Id's please!

FWIW, checkpatch.pl would have caught this and the nits I found below. It might be worth running patches through it before sending.

Quoted 19 lines
Signed-off-by Jeykumar Sankaran <[email protected]>
---
 drivers/gpu/drm/msm/msm_drv.c | 49 ++++++++++++++-----------------------------
 1 file changed, 16 insertions(+), 33 deletions(-)
drivers/gpu/drm/msm/msm_drv.c +0 -6
index 4904d0d..ab1b0a9 100644
@@ -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);
-

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv) · line 565

Quoted 10 lines
drivers/gpu/drm/msm/msm_drv.c +5 -0
 		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, "display thread priority update failed: %d\n",

Although this is wrapped, the line still exceeds 80 chars. Perhaps:

dev_warn(dev, "disp_thread set priority failed %d\n",
ret);

Quoted 42 lines
drivers/gpu/drm/msm/msm_drv.c +9 -18
+				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;
-				}

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv) · line 592

Quoted 10 lines
drivers/gpu/drm/msm/msm_drv.c +1 -9
-
-				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, "display event thread priority update failed:%d\n",

Same problem here,
dev_warn(dev, "event thread set priority failed %d\n",

Quoted 8 lines
drivers/gpu/drm/msm/msm_drv.c +1 -0
+				ret);
 	}
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
Signature · 2 lines
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
Signature · 5 lines
Sean Paul, Software Engineer, Google / Chromium OS
_______________________________________________
Freedreno mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/freedreno
#3 lore raw
Quoted 57 lines · Sean Paul
Quoted 9 lines · Jeykumar Sankaran

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

Change-Id: I1dda805286df981c0f0e2b26507d089d3a21ff6c

No Change-Id's please!

FWIW, checkpatch.pl would have caught this and the nits I found below. It might
be worth running patches through it before sending.

Quoted 3 lines
Signed-off-by Jeykumar Sankaran <[email protected]>
---
 drivers/gpu/drm/msm/msm_drv.c | 49

++++++++++++++-----------------------------

Review

Quoted 3 lines
 1 file changed, 16 insertions(+), 33 deletions(-)
(quoted diff) +0 -0

b/drivers/gpu/drm/msm/msm_drv.c

Quoted 5 lines

index 4904d0d..ab1b0a9 100644

drivers/gpu/drm/msm/msm_drv.c +0 -0
@@ -553,17 +553,18 @@ static int msm_drm_init(struct device *dev,

struct

drm_driver *drv)

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 3 lines
drivers/gpu/drm/msm/msm_drv.c +0 -0
 			kthread_run(kthread_worker_fn,
 				&priv->disp_thread[i].worker,
 				"crtc_commit:%d",

priv->disp_thread[i].crtc_id);

drivers/gpu/drm/msm/msm_drv.c

Quoted 2 lines
drivers/gpu/drm/msm/msm_drv.c +0 -2
-		ret = sched_setscheduler(priv->disp_thread[i].thread,
-							SCHED_FIFO,

&param);

drivers/gpu/drm/msm/msm_drv.c

Quoted 2 lines
drivers/gpu/drm/msm/msm_drv.c +0 -2
-		if (ret)
-			pr_warn("display thread priority update failed:

%d\n",

Quoted 1 line

-

ret);

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 3 lines
drivers/gpu/drm/msm/msm_drv.c +0 -1
-
 		if (IS_ERR(priv->disp_thread[i].thread)) {
 			dev_err(dev, "failed to create crtc_commit

kthread\n");

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 8 lines
drivers/gpu/drm/msm/msm_drv.c +5 -0
 			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, "display thread priority update

failed: %d\n",

Quoted 6 lines

Although this is wrapped, the line still exceeds 80 chars. Perhaps:

dev_warn(dev, "disp_thread set priority failed
%d\n",

                                 ret);

I did run the checkpath.pl on this patch. Check patch usually will not complain if the >80 exceeding line is the logging string.

https://01.org/linuxgraphics/gfx-docs/drm/process/coding-style.html#breaking-long-lines-and-strings

https://gitlab.freedesktop.org/seanpaul/dpu-staging/blob/for-next/scripts/checkpatch.pl#L3058

Anyway, rewording will be a good idea to avoid nits!

Quoted 84 lines
Quoted 7 lines
drivers/gpu/drm/msm/msm_drv.c +2 -0
+				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)

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 3 lines
drivers/gpu/drm/msm/msm_drv.c +0 -0
 			kthread_run(kthread_worker_fn,
 				&priv->event_thread[i].worker,
 				"crtc_event:%d",

priv->event_thread[i].crtc_id);

drivers/gpu/drm/msm/msm_drv.c

Quoted 2 lines
drivers/gpu/drm/msm/msm_drv.c +2 -0
+		if (IS_ERR(priv->event_thread[i].thread)) {
+			dev_err(dev, "failed to create crtc_event

kthread\n");

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 6 lines
drivers/gpu/drm/msm/msm_drv.c +4 -0
+			priv->event_thread[i].thread = NULL;
+			goto err_msm_uninit;
+		}
+
 		/**
 		 * event thread should also run at same priority as

disp_thread

Quoted 1 line

* because it is handling frame_done events. A lower

priority

Quoted 2 lines
drivers/gpu/drm/msm/msm_drv.c +0 -0
@@ -580,34 +587,10 @@ static int msm_drm_init(struct device *dev,

struct

drm_driver *drv)

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 4 lines
drivers/gpu/drm/msm/msm_drv.c +0 -1
 		 * failure at crtc commit level.
 		 */
 		ret = sched_setscheduler(priv->event_thread[i].thread,
-							SCHED_FIFO,

&param);

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 3 lines
drivers/gpu/drm/msm/msm_drv.c +1 -1
+					 SCHED_FIFO, &param);
 		if (ret)
-			pr_warn("display event thread priority update

failed: %d\n",

Quoted 1 line

-

ret);

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 3 lines
drivers/gpu/drm/msm/msm_drv.c +0 -3
-
-		if (IS_ERR(priv->event_thread[i].thread)) {
-			dev_err(dev, "failed to create crtc_event

kthread\n");

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv) · line 602

Quoted 10 lines
drivers/gpu/drm/msm/msm_drv.c +0 -10
-			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);

drivers/gpu/drm/msm/msm_drv.c

Quoted 1 line
drivers/gpu/drm/msm/msm_drv.c +0 -1
-					priv->disp_thread[i].thread =

NULL;

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 5 lines
drivers/gpu/drm/msm/msm_drv.c +0 -5
-				}
-
-				if (priv->event_thread[i].thread) {
-					kthread_stop(
-

priv->event_thread[i].thread);

drivers/gpu/drm/msm/msm_drv.c

Quoted 1 line
drivers/gpu/drm/msm/msm_drv.c +0 -1
-					priv->event_thread[i].thread =

NULL;

drivers/gpu/drm/msm/msm_drv.c static int msm_drm_init(struct device *dev, struct drm_driver *drv)

Quoted 5 lines
drivers/gpu/drm/msm/msm_drv.c +1 -4
-				}
-			}
-			goto err_msm_uninit;
-		}
+			dev_warn(dev, "display event thread priority

update failed:%d\n",

Same problem here,
dev_warn(dev, "event thread set priority failed
%d\n",

Quoted 6 lines
drivers/gpu/drm/msm/msm_drv.c +1 -1
+				ret);
 	}
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
--

The Qualcomm Innovation Center, Inc. is a member of the Code Aurora

Forum,

Quoted 2 lines

a Linux Foundation Collaborative Project

Signature · 5 lines
Jeykumar S
_______________________________________________
Freedreno mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/freedreno