[PATCH 07/12] drm/msm: Handle drm_atomic_helper_swap_state failure

[PATCH 07/12] drm/msm: Handle drm_atomic_helper_swap_state failure

[Maarten Lankhorst]

drm_atomic_helper_swap_state() will be changed to interruptible waiting
in the next few commits, so all drivers have to be changed to handling
failure.

MSM has its own busy tracking, which means the swap_state call can be
done with stall = false, in which case it should never return an error.
Handle failure with BUG_ON for this reason.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-8-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 9633a68b14d7..badfa8717317 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -232,20 +232,18 @@ int msm_atomic_commit(struct drm_device *dev,
 	 * mark our set of crtc's as busy:
 	 */
 	ret = start_atomic(dev->dev_private, c->crtc_mask);
-	if (ret) {
-		kfree(c);
-		goto error;
-	}
+	if (ret)
+		goto err_free;
+
+	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
 
 	/*
 	 * This is the point of no return - everything below never fails except
 	 * when the hw goes bonghits. Which means we can commit the new state on
 	 * the software side now.
+	 *
+	 * swap driver private state while still holding state_lock
 	 */
-
-	drm_atomic_helper_swap_state(state, true);
-
-	/* swap driver private state while still holding state_lock */
 	if (to_kms_state(state)->state)
 		priv->kms->funcs->swap_state(priv->kms, state);
 
@@ -275,6 +273,8 @@ int msm_atomic_commit(struct drm_device *dev,
 
 	return 0;
 
+err_free:
+	kfree(c);
 error:
 	drm_atomic_helper_cleanup_planes(dev, state);
 	return ret;
-- 
2.11.0

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Re: [PATCH 07/12] drm/msm: Handle drm_atomic_helper_swap_state failure

[Archit Taneja]

On 07/19/2017 01:10 PM, Maarten Lankhorst wrote:
> drm_atomic_helper_swap_state() will be changed to interruptible waiting
> in the next few commits, so all drivers have to be changed to handling
> failure.
> 
> MSM has its own busy tracking, which means the swap_state call can be
> done with stall = false, in which case it should never return an error.
> Handle failure with BUG_ON for this reason.
> 

Applied #2/12 and tried this out.

Tested-by: Archit Taneja <architt@codeaurora.org>

> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-8-maarten.lankhorst@linux.intel.com
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Reviewed-by: Sean Paul <seanpaul@chromium.org>
> ---
>   drivers/gpu/drm/msm/msm_atomic.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> index 9633a68b14d7..badfa8717317 100644
> --- a/drivers/gpu/drm/msm/msm_atomic.c
> +++ b/drivers/gpu/drm/msm/msm_atomic.c
> @@ -232,20 +232,18 @@ int msm_atomic_commit(struct drm_device *dev,
>   	 * mark our set of crtc's as busy:
>   	 */
>   	ret = start_atomic(dev->dev_private, c->crtc_mask);
> -	if (ret) {
> -		kfree(c);
> -		goto error;
> -	}
> +	if (ret)
> +		goto err_free;
> +
> +	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
>   
>   	/*
>   	 * This is the point of no return - everything below never fails except
>   	 * when the hw goes bonghits. Which means we can commit the new state on
>   	 * the software side now.
> +	 *
> +	 * swap driver private state while still holding state_lock
>   	 */
> -
> -	drm_atomic_helper_swap_state(state, true);
> -
> -	/* swap driver private state while still holding state_lock */
>   	if (to_kms_state(state)->state)
>   		priv->kms->funcs->swap_state(priv->kms, state);
>   
> @@ -275,6 +273,8 @@ int msm_atomic_commit(struct drm_device *dev,
>   
>   	return 0;
>   
> +err_free:
> +	kfree(c);
>   error:
>   	drm_atomic_helper_cleanup_planes(dev, state);
>   	return ret;
> 

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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Re: [PATCH 07/12] drm/msm: Handle drm_atomic_helper_swap_state failure

[Maarten Lankhorst]

Op 19-07-17 om 11:24 schreef Archit Taneja:
>
>
> On 07/19/2017 01:10 PM, Maarten Lankhorst wrote:
>> drm_atomic_helper_swap_state() will be changed to interruptible waiting
>> in the next few commits, so all drivers have to be changed to handling
>> failure.
>>
>> MSM has its own busy tracking, which means the swap_state call can be
>> done with stall = false, in which case it should never return an error.
>> Handle failure with BUG_ON for this reason.
>>
>
> Applied #2/12 and tried this out.
>
> Tested-by: Archit Taneja <architt@codeaurora.org> 
Thanks, applied series.

I accidentally sent this out to everyone instead of trybot only, but applying your t-b to the commit. :)
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