[1/4] PM/Domains: Add support for retrieving genpd performance states information
diff mbox series

Message ID 1565398727-23090-2-git-send-email-thara.gopinath@linaro.org
State Superseded, archived
Headers show
Series
  • qcom: Model RPMH power domains as thermal cooling devices
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Commit Message

Thara Gopinath Aug. 10, 2019, 12:58 a.m. UTC
Add two new APIs in the genpd framework,
dev_pm_genpd_get_performance_state to return the current performance
state of a power domain and dev_pm_genpd_performance_state_count to
return the total number of performance states supported by a
power domain. Since the genpd framework does not maintain
a count of number of performance states supported by a power domain,
introduce a new callback(.get_performance_state_count) that can be used
to retrieve this information from power domain drivers.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
 drivers/base/power/domain.c | 38 ++++++++++++++++++++++++++++++++++++++
 include/linux/pm_domain.h   | 18 ++++++++++++++++++
 2 files changed, 56 insertions(+)

Comments

Ulf Hansson Aug. 22, 2019, 3:03 p.m. UTC | #1
On Sat, 10 Aug 2019 at 02:58, Thara Gopinath <thara.gopinath@linaro.org> wrote:
>
> Add two new APIs in the genpd framework,
> dev_pm_genpd_get_performance_state to return the current performance
> state of a power domain and dev_pm_genpd_performance_state_count to
> return the total number of performance states supported by a
> power domain. Since the genpd framework does not maintain
> a count of number of performance states supported by a power domain,
> introduce a new callback(.get_performance_state_count) that can be used
> to retrieve this information from power domain drivers.

I think some brief background to *why* this is useful needs to be
squeezed into the changelog. Or at least state that following changes
makes use of it, somehow.

>
> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
> ---
>  drivers/base/power/domain.c | 38 ++++++++++++++++++++++++++++++++++++++
>  include/linux/pm_domain.h   | 18 ++++++++++++++++++
>  2 files changed, 56 insertions(+)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index b063bc4..17e0375 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -413,6 +413,44 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
>
> +int dev_pm_genpd_get_performance_state(struct device *dev,
> +                                      unsigned int *state)
> +{
> +       struct generic_pm_domain *genpd;
> +
> +       genpd = dev_to_genpd(dev);

We need to verify that the there is a genpd attached before doing this
cast. Let me post a patch in a day or so, it will give you a helper
function that covers this.

> +       if (IS_ERR(genpd))
> +               return -ENODEV;
> +
> +       genpd_lock(genpd);
> +       *state = genpd->performance_state;

Why not return the state, rather than assigning an out-parameter?

> +       genpd_unlock(genpd);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
> +
> +int dev_pm_genpd_performance_state_count(struct device *dev,
> +                                        unsigned int *count)
> +{
> +       struct generic_pm_domain *genpd;
> +       int ret;
> +
> +       genpd = dev_to_genpd(dev);
> +       if (IS_ERR(genpd))
> +               return -ENODEV;
> +
> +       if (unlikely(!genpd->get_performance_state_count))
> +               return -EINVAL;
> +
> +       genpd_lock(genpd);
> +       ret = genpd->get_performance_state_count(genpd, count);

Why not having the callback to return the state, rather than using an
out-parameter?

> +       genpd_unlock(genpd);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count);
> +
>  static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
>  {
>         unsigned int state_idx = genpd->state_idx;
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index 91d9bf4..0e5f502 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -117,6 +117,8 @@ struct generic_pm_domain {
>                                                  struct dev_pm_opp *opp);
>         int (*set_performance_state)(struct generic_pm_domain *genpd,
>                                      unsigned int state);
> +       int (*get_performance_state_count)(struct generic_pm_domain *genpd,
> +                                          unsigned int *count);
>         struct gpd_dev_ops dev_ops;
>         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
>         bool max_off_time_changed;
> @@ -204,6 +206,10 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
>                   struct dev_power_governor *gov, bool is_off);
>  int pm_genpd_remove(struct generic_pm_domain *genpd);
>  int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
> +int dev_pm_genpd_get_performance_state(struct device *dev,
> +                                      unsigned int *state);
> +int dev_pm_genpd_performance_state_count(struct device *dev,
> +                                        unsigned int *count);
>
>  extern struct dev_power_governor simple_qos_governor;
>  extern struct dev_power_governor pm_domain_always_on_gov;
> @@ -251,6 +257,18 @@ static inline int dev_pm_genpd_set_performance_state(struct device *dev,
>         return -ENOTSUPP;
>  }
>
> +static inline int dev_pm_genpd_get_performance_state(struct device *dev,
> +                                                    unsigned int *state);
> +{
> +       return -ENOTSUPP;
> +}
> +
> +static inline int dev_pm_genpd_performance_state_count(struct device *dev,
> +                                                      unsigned int *count);
> +{
> +       return -ENOTSUPP;
> +}
> +
>  #define simple_qos_governor            (*(struct dev_power_governor *)(NULL))
>  #define pm_domain_always_on_gov                (*(struct dev_power_governor *)(NULL))
>  #endif
> --
> 2.1.4
>

Kind regards
Uffe
Thara Gopinath Aug. 23, 2019, 5:39 p.m. UTC | #2
Hi Ulf,

Thanks for the review.

On 08/22/2019 11:03 AM, Ulf Hansson wrote:
> On Sat, 10 Aug 2019 at 02:58, Thara Gopinath <thara.gopinath@linaro.org> wrote:
>>
>> Add two new APIs in the genpd framework,
>> dev_pm_genpd_get_performance_state to return the current performance
>> state of a power domain and dev_pm_genpd_performance_state_count to
>> return the total number of performance states supported by a
>> power domain. Since the genpd framework does not maintain
>> a count of number of performance states supported by a power domain,
>> introduce a new callback(.get_performance_state_count) that can be used
>> to retrieve this information from power domain drivers.
> 
> I think some brief background to *why* this is useful needs to be
> squeezed into the changelog. Or at least state that following changes
> makes use of it, somehow.

Will do.
> 
>>
>> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
>> ---
>>  drivers/base/power/domain.c | 38 ++++++++++++++++++++++++++++++++++++++
>>  include/linux/pm_domain.h   | 18 ++++++++++++++++++
>>  2 files changed, 56 insertions(+)
>>
>> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
>> index b063bc4..17e0375 100644
>> --- a/drivers/base/power/domain.c
>> +++ b/drivers/base/power/domain.c
>> @@ -413,6 +413,44 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
>>  }
>>  EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
>>
>> +int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                      unsigned int *state)
>> +{
>> +       struct generic_pm_domain *genpd;
>> +
>> +       genpd = dev_to_genpd(dev);
> 
> We need to verify that the there is a genpd attached before doing this
> cast. Let me post a patch in a day or so, it will give you a helper
> function that covers this.

Sounds good.. Thanks.. I will wait for it.

> 
>> +       if (IS_ERR(genpd))
>> +               return -ENODEV;
>> +
>> +       genpd_lock(genpd);
>> +       *state = genpd->performance_state;
> 
> Why not return the state, rather than assigning an out-parameter?
We can. I will change it for this and dev_pm_genpd_performance_state_count.

Regards
Thara

> 
>> +       genpd_unlock(genpd);
>> +
>> +       return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
>> +
>> +int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                        unsigned int *count)
>> +{
>> +       struct generic_pm_domain *genpd;
>> +       int ret;
>> +
>> +       genpd = dev_to_genpd(dev);
>> +       if (IS_ERR(genpd))
>> +               return -ENODEV;
>> +
>> +       if (unlikely(!genpd->get_performance_state_count))
>> +               return -EINVAL;
>> +
>> +       genpd_lock(genpd);
>> +       ret = genpd->get_performance_state_count(genpd, count);
> 
> Why not having the callback to return the state, rather than using an
> out-parameter?
> 
>> +       genpd_unlock(genpd);
>> +
>> +       return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count);
>> +
>>  static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
>>  {
>>         unsigned int state_idx = genpd->state_idx;
>> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
>> index 91d9bf4..0e5f502 100644
>> --- a/include/linux/pm_domain.h
>> +++ b/include/linux/pm_domain.h
>> @@ -117,6 +117,8 @@ struct generic_pm_domain {
>>                                                  struct dev_pm_opp *opp);
>>         int (*set_performance_state)(struct generic_pm_domain *genpd,
>>                                      unsigned int state);
>> +       int (*get_performance_state_count)(struct generic_pm_domain *genpd,
>> +                                          unsigned int *count);
>>         struct gpd_dev_ops dev_ops;
>>         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
>>         bool max_off_time_changed;
>> @@ -204,6 +206,10 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
>>                   struct dev_power_governor *gov, bool is_off);
>>  int pm_genpd_remove(struct generic_pm_domain *genpd);
>>  int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
>> +int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                      unsigned int *state);
>> +int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                        unsigned int *count);
>>
>>  extern struct dev_power_governor simple_qos_governor;
>>  extern struct dev_power_governor pm_domain_always_on_gov;
>> @@ -251,6 +257,18 @@ static inline int dev_pm_genpd_set_performance_state(struct device *dev,
>>         return -ENOTSUPP;
>>  }
>>
>> +static inline int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                                    unsigned int *state);
>> +{
>> +       return -ENOTSUPP;
>> +}
>> +
>> +static inline int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                                      unsigned int *count);
>> +{
>> +       return -ENOTSUPP;
>> +}
>> +
>>  #define simple_qos_governor            (*(struct dev_power_governor *)(NULL))
>>  #define pm_domain_always_on_gov                (*(struct dev_power_governor *)(NULL))
>>  #endif
>> --
>> 2.1.4
>>
> 
> Kind regards
> Uffe
>
Thara Gopinath Sept. 6, 2019, 10:24 p.m. UTC | #3
On 08/22/2019 11:03 AM, Ulf Hansson wrote:
> On Sat, 10 Aug 2019 at 02:58, Thara Gopinath <thara.gopinath@linaro.org> wrote:
>>
>> Add two new APIs in the genpd framework,
>> dev_pm_genpd_get_performance_state to return the current performance
>> state of a power domain and dev_pm_genpd_performance_state_count to
>> return the total number of performance states supported by a
>> power domain. Since the genpd framework does not maintain
>> a count of number of performance states supported by a power domain,
>> introduce a new callback(.get_performance_state_count) that can be used
>> to retrieve this information from power domain drivers.
> 
> I think some brief background to *why* this is useful needs to be
> squeezed into the changelog. Or at least state that following changes
> makes use of it, somehow.
> 
>>
>> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
>> ---
>>  drivers/base/power/domain.c | 38 ++++++++++++++++++++++++++++++++++++++
>>  include/linux/pm_domain.h   | 18 ++++++++++++++++++
>>  2 files changed, 56 insertions(+)
>>
>> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
>> index b063bc4..17e0375 100644
>> --- a/drivers/base/power/domain.c
>> +++ b/drivers/base/power/domain.c
>> @@ -413,6 +413,44 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
>>  }
>>  EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
>>
>> +int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                      unsigned int *state)
>> +{
>> +       struct generic_pm_domain *genpd;
>> +
>> +       genpd = dev_to_genpd(dev);
> 
> We need to verify that the there is a genpd attached before doing this
> cast. Let me post a patch in a day or so, it will give you a helper
> function that covers this.
> 
>> +       if (IS_ERR(genpd))
>> +               return -ENODEV;
>> +
>> +       genpd_lock(genpd);
>> +       *state = genpd->performance_state;
> 
> Why not return the state, rather than assigning an out-parameter?
> 
>> +       genpd_unlock(genpd);
>> +
>> +       return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
>> +
>> +int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                        unsigned int *count)
>> +{
>> +       struct generic_pm_domain *genpd;
>> +       int ret;
>> +
>> +       genpd = dev_to_genpd(dev);
>> +       if (IS_ERR(genpd))
>> +               return -ENODEV;
>> +
>> +       if (unlikely(!genpd->get_performance_state_count))
>> +               return -EINVAL;
>> +
>> +       genpd_lock(genpd);
>> +       ret = genpd->get_performance_state_count(genpd, count);
> 
> Why not having the callback to return the state, rather than using an
> out-parameter?
Hi Ulf,
I just realized that returning the state instead of using a parameter
will prevent me from access under lock. Is that okay ?

Regards
Thara
> 
>> +       genpd_unlock(genpd);
>> +
>> +       return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count);
>> +
>>  static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
>>  {
>>         unsigned int state_idx = genpd->state_idx;
>> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
>> index 91d9bf4..0e5f502 100644
>> --- a/include/linux/pm_domain.h
>> +++ b/include/linux/pm_domain.h
>> @@ -117,6 +117,8 @@ struct generic_pm_domain {
>>                                                  struct dev_pm_opp *opp);
>>         int (*set_performance_state)(struct generic_pm_domain *genpd,
>>                                      unsigned int state);
>> +       int (*get_performance_state_count)(struct generic_pm_domain *genpd,
>> +                                          unsigned int *count);
>>         struct gpd_dev_ops dev_ops;
>>         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
>>         bool max_off_time_changed;
>> @@ -204,6 +206,10 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
>>                   struct dev_power_governor *gov, bool is_off);
>>  int pm_genpd_remove(struct generic_pm_domain *genpd);
>>  int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
>> +int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                      unsigned int *state);
>> +int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                        unsigned int *count);
>>
>>  extern struct dev_power_governor simple_qos_governor;
>>  extern struct dev_power_governor pm_domain_always_on_gov;
>> @@ -251,6 +257,18 @@ static inline int dev_pm_genpd_set_performance_state(struct device *dev,
>>         return -ENOTSUPP;
>>  }
>>
>> +static inline int dev_pm_genpd_get_performance_state(struct device *dev,
>> +                                                    unsigned int *state);
>> +{
>> +       return -ENOTSUPP;
>> +}
>> +
>> +static inline int dev_pm_genpd_performance_state_count(struct device *dev,
>> +                                                      unsigned int *count);
>> +{
>> +       return -ENOTSUPP;
>> +}
>> +
>>  #define simple_qos_governor            (*(struct dev_power_governor *)(NULL))
>>  #define pm_domain_always_on_gov                (*(struct dev_power_governor *)(NULL))
>>  #endif
>> --
>> 2.1.4
>>
> 
> Kind regards
> Uffe
>
Ulf Hansson Sept. 9, 2019, 9:40 a.m. UTC | #4
On Sat, 7 Sep 2019 at 00:24, Thara Gopinath <thara.gopinath@linaro.org> wrote:
>
> On 08/22/2019 11:03 AM, Ulf Hansson wrote:
> > On Sat, 10 Aug 2019 at 02:58, Thara Gopinath <thara.gopinath@linaro.org> wrote:
> >>
> >> Add two new APIs in the genpd framework,
> >> dev_pm_genpd_get_performance_state to return the current performance
> >> state of a power domain and dev_pm_genpd_performance_state_count to
> >> return the total number of performance states supported by a
> >> power domain. Since the genpd framework does not maintain
> >> a count of number of performance states supported by a power domain,
> >> introduce a new callback(.get_performance_state_count) that can be used
> >> to retrieve this information from power domain drivers.
> >
> > I think some brief background to *why* this is useful needs to be
> > squeezed into the changelog. Or at least state that following changes
> > makes use of it, somehow.
> >
> >>
> >> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
> >> ---
> >>  drivers/base/power/domain.c | 38 ++++++++++++++++++++++++++++++++++++++
> >>  include/linux/pm_domain.h   | 18 ++++++++++++++++++
> >>  2 files changed, 56 insertions(+)
> >>
> >> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> >> index b063bc4..17e0375 100644
> >> --- a/drivers/base/power/domain.c
> >> +++ b/drivers/base/power/domain.c
> >> @@ -413,6 +413,44 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
> >>  }
> >>  EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
> >>
> >> +int dev_pm_genpd_get_performance_state(struct device *dev,
> >> +                                      unsigned int *state)
> >> +{
> >> +       struct generic_pm_domain *genpd;
> >> +
> >> +       genpd = dev_to_genpd(dev);
> >
> > We need to verify that the there is a genpd attached before doing this
> > cast. Let me post a patch in a day or so, it will give you a helper
> > function that covers this.
> >
> >> +       if (IS_ERR(genpd))
> >> +               return -ENODEV;
> >> +
> >> +       genpd_lock(genpd);
> >> +       *state = genpd->performance_state;
> >
> > Why not return the state, rather than assigning an out-parameter?
> >
> >> +       genpd_unlock(genpd);
> >> +
> >> +       return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
> >> +
> >> +int dev_pm_genpd_performance_state_count(struct device *dev,
> >> +                                        unsigned int *count)
> >> +{
> >> +       struct generic_pm_domain *genpd;
> >> +       int ret;
> >> +
> >> +       genpd = dev_to_genpd(dev);
> >> +       if (IS_ERR(genpd))
> >> +               return -ENODEV;
> >> +
> >> +       if (unlikely(!genpd->get_performance_state_count))
> >> +               return -EINVAL;
> >> +
> >> +       genpd_lock(genpd);
> >> +       ret = genpd->get_performance_state_count(genpd, count);
> >
> > Why not having the callback to return the state, rather than using an
> > out-parameter?
> Hi Ulf,
> I just realized that returning the state instead of using a parameter
> will prevent me from access under lock. Is that okay ?

Not sure I understand. Why can't you just assign a local variable and
return that?

Like this:

genpd_lock();
count = genpd->get_performance_state_count();
genpd_unlock();

return count;

[...]

Kind regards
Uffe

Patch
diff mbox series

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index b063bc4..17e0375 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -413,6 +413,44 @@  int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
 }
 EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
 
+int dev_pm_genpd_get_performance_state(struct device *dev,
+				       unsigned int *state)
+{
+	struct generic_pm_domain *genpd;
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -ENODEV;
+
+	genpd_lock(genpd);
+	*state = genpd->performance_state;
+	genpd_unlock(genpd);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
+
+int dev_pm_genpd_performance_state_count(struct device *dev,
+					 unsigned int *count)
+{
+	struct generic_pm_domain *genpd;
+	int ret;
+
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
+		return -ENODEV;
+
+	if (unlikely(!genpd->get_performance_state_count))
+		return -EINVAL;
+
+	genpd_lock(genpd);
+	ret = genpd->get_performance_state_count(genpd, count);
+	genpd_unlock(genpd);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count);
+
 static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 {
 	unsigned int state_idx = genpd->state_idx;
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 91d9bf4..0e5f502 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -117,6 +117,8 @@  struct generic_pm_domain {
 						 struct dev_pm_opp *opp);
 	int (*set_performance_state)(struct generic_pm_domain *genpd,
 				     unsigned int state);
+	int (*get_performance_state_count)(struct generic_pm_domain *genpd,
+					   unsigned int *count);
 	struct gpd_dev_ops dev_ops;
 	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
 	bool max_off_time_changed;
@@ -204,6 +206,10 @@  int pm_genpd_init(struct generic_pm_domain *genpd,
 		  struct dev_power_governor *gov, bool is_off);
 int pm_genpd_remove(struct generic_pm_domain *genpd);
 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
+int dev_pm_genpd_get_performance_state(struct device *dev,
+				       unsigned int *state);
+int dev_pm_genpd_performance_state_count(struct device *dev,
+					 unsigned int *count);
 
 extern struct dev_power_governor simple_qos_governor;
 extern struct dev_power_governor pm_domain_always_on_gov;
@@ -251,6 +257,18 @@  static inline int dev_pm_genpd_set_performance_state(struct device *dev,
 	return -ENOTSUPP;
 }
 
+static inline int dev_pm_genpd_get_performance_state(struct device *dev,
+						     unsigned int *state);
+{
+	return -ENOTSUPP;
+}
+
+static inline int dev_pm_genpd_performance_state_count(struct device *dev,
+						       unsigned int *count);
+{
+	return -ENOTSUPP;
+}
+
 #define simple_qos_governor		(*(struct dev_power_governor *)(NULL))
 #define pm_domain_always_on_gov		(*(struct dev_power_governor *)(NULL))
 #endif