[Intel-gfx] [PATCH 10/46] drm/i915/pmu: Track rpm wakeref

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Track the wakeref used for temporary access to the device, and discard
> it upon release so that leaks can be identified.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_pmu.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index c99fcfce79d5..3d43fc9dd25d 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -167,6 +167,7 @@ engines_sample(struct drm_i915_private *dev_priv, unsigned int period_ns)
>  {
>  	struct intel_engine_cs *engine;
>  	enum intel_engine_id id;
> +	intel_wakeref_t wakeref;
>  	bool fw = false;
>  
>  	if ((dev_priv->pmu.enable & ENGINE_SAMPLE_MASK) == 0)
> @@ -175,7 +176,8 @@ engines_sample(struct drm_i915_private *dev_priv, unsigned int period_ns)
>  	if (!dev_priv->gt.awake)
>  		return;
>  
> -	if (!intel_runtime_pm_get_if_in_use(dev_priv))
> +	wakeref = intel_runtime_pm_get_if_in_use(dev_priv);
> +	if (!wakeref)
>  		return;
>  
>  	for_each_engine(engine, dev_priv, id) {
> @@ -210,7 +212,7 @@ engines_sample(struct drm_i915_private *dev_priv, unsigned int period_ns)
>  	if (fw)
>  		intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
>  
> -	intel_runtime_pm_put_unchecked(dev_priv);
> +	intel_runtime_pm_put(dev_priv, wakeref);
>  }
>  
>  static void
> @@ -227,11 +229,15 @@ frequency_sample(struct drm_i915_private *dev_priv, unsigned int period_ns)
>  		u32 val;
>  
>  		val = dev_priv->gt_pm.rps.cur_freq;
> -		if (dev_priv->gt.awake &&
> -		    intel_runtime_pm_get_if_in_use(dev_priv)) {
> -			val = intel_get_cagf(dev_priv,
> -					     I915_READ_NOTRACE(GEN6_RPSTAT1));
> -			intel_runtime_pm_put_unchecked(dev_priv);
> +		if (dev_priv->gt.awake) {
> +			intel_wakeref_t wakeref =
> +				intel_runtime_pm_get_if_in_use(dev_priv);
> +
> +			if (wakeref) {
> +				val = intel_get_cagf(dev_priv,
> +						     I915_READ_NOTRACE(GEN6_RPSTAT1));
> +				intel_runtime_pm_put(dev_priv, wakeref);
> +			}
>  		}
>  
>  		add_sample_mult(&dev_priv->pmu.sample[__I915_SAMPLE_FREQ_ACT],
> @@ -443,12 +449,14 @@ static u64 __get_rc6(struct drm_i915_private *i915)
>  static u64 get_rc6(struct drm_i915_private *i915)
>  {
>  #if IS_ENABLED(CONFIG_PM)
> +	intel_wakeref_t wakeref;
>  	unsigned long flags;
>  	u64 val;
>  
> -	if (intel_runtime_pm_get_if_in_use(i915)) {
> +	wakeref = intel_runtime_pm_get_if_in_use(i915);
> +	if (wakeref) {
>  		val = __get_rc6(i915);
> -		intel_runtime_pm_put_unchecked(i915);
> +		intel_runtime_pm_put(i915, wakeref);
>  
>  		/*
>  		 * If we are coming back from being runtime suspended we must
> -- 
> 2.20.1
>
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