On Mon, 14 Jan 2019 18:37:52 +0100,
Chris Wilson wrote:
>
> drm/i915 is tracking all wakeref owners with a cookie in order to
> identify leaks. To that end, each rpm acquisition ops->get_power is
> assigned a cookie which should be passed to ops->put_power to signify
> its release (and removal from the list of wakeref owners). As snd/hda is
> already using a bool to track current status of display_power extending
> that to an unsigned long to hold the boolean cookie is a trivial
> extension, and will quell all doubt that snd/hda is the cause of the
> device runtime pm leaks.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Takashi Iwai <tiwai@xxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_audio.c | 10 +++++-----
> include/drm/drm_audio_component.h | 7 +++++--
> include/sound/hdaudio.h | 4 ++--
> sound/hda/hdac_component.c | 18 ++++++++++++------
> 4 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index 92e27359c2e3..efc5fb3c2161 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -741,15 +741,15 @@ void intel_init_audio_hooks(struct drm_i915_private *dev_priv)
> }
> }
>
> -static void i915_audio_component_get_power(struct device *kdev)
> +static unsigned long i915_audio_component_get_power(struct device *kdev)
> {
> - intel_display_power_get(kdev_to_i915(kdev), POWER_DOMAIN_AUDIO);
> + return intel_display_power_get(kdev_to_i915(kdev), POWER_DOMAIN_AUDIO);
> }
>
> -static void i915_audio_component_put_power(struct device *kdev)
> +static void i915_audio_component_put_power(struct device *kdev,
> + unsigned long cookie)
> {
> - intel_display_power_put_unchecked(kdev_to_i915(kdev),
> - POWER_DOMAIN_AUDIO);
> + intel_display_power_put(kdev_to_i915(kdev), POWER_DOMAIN_AUDIO, cookie);
> }
>
> static void i915_audio_component_codec_wake_override(struct device *kdev,
> diff --git a/include/drm/drm_audio_component.h b/include/drm/drm_audio_component.h
> index 4923b00328c1..d0c7444319f5 100644
> --- a/include/drm/drm_audio_component.h
> +++ b/include/drm/drm_audio_component.h
> @@ -18,14 +18,17 @@ struct drm_audio_component_ops {
> * @get_power: get the POWER_DOMAIN_AUDIO power well
> *
> * Request the power well to be turned on.
> + *
> + * Returns a wakeref cookie to be passed back to the corresponding
> + * call to @put_power.
Better to explain that the cookie should be non-zero for active
state.
> */
> - void (*get_power)(struct device *);
> + unsigned long (*get_power)(struct device *);
> /**
> * @put_power: put the POWER_DOMAIN_AUDIO power well
> *
> * Allow the power well to be turned off.
> */
> - void (*put_power)(struct device *);
> + void (*put_power)(struct device *, unsigned long);
> /**
> * @codec_wake_override: Enable/disable codec wake signal
> */
> diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
> index b4fa1c775251..39761120ee76 100644
> --- a/include/sound/hdaudio.h
> +++ b/include/sound/hdaudio.h
> @@ -366,8 +366,8 @@ struct hdac_bus {
>
> /* DRM component interface */
> struct drm_audio_component *audio_component;
> - long display_power_status;
> - bool display_power_active;
> + unsigned long display_power_status;
You don't need to change this field. It's irrelevant with this patch
itself.
thanks,
Takashi
> + unsigned long display_power_active;
>
> /* parameters required for enhanced capabilities */
> int num_streams;
> diff --git a/sound/hda/hdac_component.c b/sound/hda/hdac_component.c
> index a6d37b9d6413..2702548b788a 100644
> --- a/sound/hda/hdac_component.c
> +++ b/sound/hda/hdac_component.c
> @@ -79,17 +79,23 @@ void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable)
>
> if (bus->display_power_status) {
> if (!bus->display_power_active) {
> + unsigned long cookie = -1;
> +
> if (acomp->ops->get_power)
> - acomp->ops->get_power(acomp->dev);
> + cookie = acomp->ops->get_power(acomp->dev);
> +
> snd_hdac_set_codec_wakeup(bus, true);
> snd_hdac_set_codec_wakeup(bus, false);
> - bus->display_power_active = true;
> + bus->display_power_active = cookie;
> }
> } else {
> if (bus->display_power_active) {
> + unsigned long cookie = bus->display_power_active;
> +
> if (acomp->ops->put_power)
> - acomp->ops->put_power(acomp->dev);
> - bus->display_power_active = false;
> + acomp->ops->put_power(acomp->dev, cookie);
> +
> + bus->display_power_active = 0;
> }
> }
> }
> @@ -325,9 +331,9 @@ int snd_hdac_acomp_exit(struct hdac_bus *bus)
> return 0;
>
> if (WARN_ON(bus->display_power_active) && acomp->ops)
> - acomp->ops->put_power(acomp->dev);
> + acomp->ops->put_power(acomp->dev, bus->display_power_active);
>
> - bus->display_power_active = false;
> + bus->display_power_active = 0;
> bus->display_power_status = 0;
>
> component_master_del(dev, &hdac_component_master_ops);
> --
> 2.20.1
>
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