Re: [Intel-gfx] [PATCH 18/18] drm/i915/runtime_pm: Prefer drm_WARN* over WARN*

[Jani Nikula <jani.nikula@linux.intel.com>]

Imre, please check the one question inline.

On Mon, 06 Apr 2020, Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com> wrote:
> struct drm_device specific drm_WARN* macros include device information
> in the backtrace, so we know what device the warnings originate from.
>
> Prefer drm_WARN* over WARN*.
>
> Conversion is done with below semantic patch:
>
> @@
> identifier func, T;
> @@
> func(struct intel_runtime_pm *T,...) {
> + struct drm_i915_private *i915 = container_of(T, struct drm_i915_private, runtime_pm);
> <+...
> (
> -WARN(
> +drm_WARN(&i915->drm,
> ...)
> |
> -WARN_ON(
> +drm_WARN_ON(&i915->drm,
> ...)
> |
> -WARN_ONCE(
> +drm_WARN_ONCE(&i915->drm,
> ...)
> |
> -WARN_ON_ONCE(
> +drm_WARN_ON_ONCE(&i915->drm,
> ...)
> )
> ...+>
>
> }
>
> Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 39 ++++++++++++++++++-------
>  1 file changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index ad719c9602af..31ccd0559c55 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -116,6 +116,9 @@ track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
>  static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
>  					     depot_stack_handle_t stack)
>  {
> +	struct drm_i915_private *i915 = container_of(rpm,
> +						     struct drm_i915_private,
> +						     runtime_pm);

Is this a dependency we want to add? Should struct intel_runtime_pm be
allowed to be elsewhere than struct i915?

BR,
Jani.

>  	unsigned long flags, n;
>  	bool found = false;
>  
> @@ -134,9 +137,9 @@ static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
>  	}
>  	spin_unlock_irqrestore(&rpm->debug.lock, flags);
>  
> -	if (WARN(!found,
> -		 "Unmatched wakeref (tracking %lu), count %u\n",
> -		 rpm->debug.count, atomic_read(&rpm->wakeref_count))) {
> +	if (drm_WARN(&i915->drm, !found,
> +		     "Unmatched wakeref (tracking %lu), count %u\n",
> +		     rpm->debug.count, atomic_read(&rpm->wakeref_count))) {
>  		char *buf;
>  
>  		buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
> @@ -355,10 +358,14 @@ intel_runtime_pm_release(struct intel_runtime_pm *rpm, int wakelock)
>  static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm,
>  					      bool wakelock)
>  {
> +	struct drm_i915_private *i915 = container_of(rpm,
> +						     struct drm_i915_private,
> +						     runtime_pm);
>  	int ret;
>  
>  	ret = pm_runtime_get_sync(rpm->kdev);
> -	WARN_ONCE(ret < 0, "pm_runtime_get_sync() failed: %d\n", ret);
> +	drm_WARN_ONCE(&i915->drm, ret < 0,
> +		      "pm_runtime_get_sync() failed: %d\n", ret);
>  
>  	intel_runtime_pm_acquire(rpm, wakelock);
>  
> @@ -539,6 +546,9 @@ void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
>   */
>  void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
>  {
> +	struct drm_i915_private *i915 = container_of(rpm,
> +						     struct drm_i915_private,
> +						     runtime_pm);
>  	struct device *kdev = rpm->kdev;
>  
>  	/*
> @@ -565,7 +575,8 @@ void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
>  
>  		pm_runtime_dont_use_autosuspend(kdev);
>  		ret = pm_runtime_get_sync(kdev);
> -		WARN(ret < 0, "pm_runtime_get_sync() failed: %d\n", ret);
> +		drm_WARN(&i915->drm, ret < 0,
> +			 "pm_runtime_get_sync() failed: %d\n", ret);
>  	} else {
>  		pm_runtime_use_autosuspend(kdev);
>  	}
> @@ -580,11 +591,14 @@ void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
>  
>  void intel_runtime_pm_disable(struct intel_runtime_pm *rpm)
>  {
> +	struct drm_i915_private *i915 = container_of(rpm,
> +						     struct drm_i915_private,
> +						     runtime_pm);
>  	struct device *kdev = rpm->kdev;
>  
>  	/* Transfer rpm ownership back to core */
> -	WARN(pm_runtime_get_sync(kdev) < 0,
> -	     "Failed to pass rpm ownership back to core\n");
> +	drm_WARN(&i915->drm, pm_runtime_get_sync(kdev) < 0,
> +		 "Failed to pass rpm ownership back to core\n");
>  
>  	pm_runtime_dont_use_autosuspend(kdev);
>  
> @@ -594,12 +608,15 @@ void intel_runtime_pm_disable(struct intel_runtime_pm *rpm)
>  
>  void intel_runtime_pm_driver_release(struct intel_runtime_pm *rpm)
>  {
> +	struct drm_i915_private *i915 = container_of(rpm,
> +						     struct drm_i915_private,
> +						     runtime_pm);
>  	int count = atomic_read(&rpm->wakeref_count);
>  
> -	WARN(count,
> -	     "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",
> -	     intel_rpm_raw_wakeref_count(count),
> -	     intel_rpm_wakelock_count(count));
> +	drm_WARN(&i915->drm, count,
> +		 "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",
> +		 intel_rpm_raw_wakeref_count(count),
> +		 intel_rpm_wakelock_count(count));
>  
>  	untrack_all_intel_runtime_pm_wakerefs(rpm);
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center
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