linux-kernel - Re: [PATCH v2 1/5] thermal: core: Add helpers to browse the cdev, tz and governor list

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Date:   Tue, 30 Jun 2020 23:09:47 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Amit Kucheria <amit.kucheria@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Ram Chandrasekar <rkumbako@...eaurora.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] thermal: core: Add helpers to browse the cdev,
 tz and governor list

Hi, Daniel,

seems that you forgot to cc linux-pm mailing list.

On Tue, 2020-06-30 at 17:16 +0530, Amit Kucheria wrote:
> On Thu, Jun 25, 2020 at 8:15 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
> > 
> > The cdev, tz and governor list, as well as their respective locks
> > are
> > statically defined in the thermal_core.c file.
> > 
> > In order to give a sane access to these list, like browsing all the
> > thermal zones or all the cooling devices, let's define a set of
> > helpers where we pass a callback as a parameter to be called for
> > each
> > thermal entity.
> > 
> > We keep the self-encapsulation and ensure the locks are correctly
> > taken when looking at the list.
> > 
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> > ---
> >  drivers/thermal/thermal_core.c | 51
> > ++++++++++++++++++++++++++++++++++
> 
> Is the idea to not use thermal_helpers.c from now on? It fits
> perfectly with a patch I have to merge all its contents to
> thermal_core.c :-)

I agree these changes should be in thermal_helper.c

thanks,
rui
> 
> 
> >  drivers/thermal/thermal_core.h |  9 ++++++
> >  2 files changed, 60 insertions(+)
> > 
> > diff --git a/drivers/thermal/thermal_core.c
> > b/drivers/thermal/thermal_core.c
> > index 2a3f83265d8b..e2f8d2550ecd 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -611,6 +611,57 @@ void
> > thermal_zone_device_rebind_exception(struct thermal_zone_device
> > *tz,
> >         mutex_unlock(&thermal_list_lock);
> >  }
> > 
> > +int for_each_thermal_governor(int (*cb)(struct thermal_governor *,
> > void *),
> > +                             void *data)
> 
> 
> > +{
> > +       struct thermal_governor *gov;
> > +       int ret = 0;
> > +
> > +       mutex_lock(&thermal_governor_lock);
> > +       list_for_each_entry(gov, &thermal_governor_list,
> > governor_list) {
> > +               ret = cb(gov, data);
> > +               if (ret)
> > +                       break;
> > +       }
> > +       mutex_unlock(&thermal_governor_lock);
> > +
> > +       return ret;
> > +}
> > +
> > +int for_each_thermal_cooling_device(int (*cb)(struct
> > thermal_cooling_device *,
> > +                                             void *), void *data)
> > +{
> > +       struct thermal_cooling_device *cdev;
> > +       int ret = 0;
> > +
> > +       mutex_lock(&thermal_list_lock);
> > +       list_for_each_entry(cdev, &thermal_cdev_list, node) {
> > +               ret = cb(cdev, data);
> > +               if (ret)
> > +                       break;
> > +       }
> > +       mutex_unlock(&thermal_list_lock);
> > +
> > +       return ret;
> > +}
> > +
> > +int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *,
> > void *),
> > +                         void *data)
> > +{
> > +       struct thermal_zone_device *tz;
> > +       int ret = 0;
> > +
> > +       mutex_lock(&thermal_list_lock);
> > +       list_for_each_entry(tz, &thermal_tz_list, node) {
> > +               ret = cb(tz, data);
> > +               if (ret)
> > +                       break;
> > +       }
> > +       mutex_unlock(&thermal_list_lock);
> > +
> > +       return ret;
> > +}
> > +
> >  void thermal_zone_device_unbind_exception(struct
> > thermal_zone_device *tz,
> >                                           const char *cdev_type,
> > size_t size)
> >  {
> > diff --git a/drivers/thermal/thermal_core.h
> > b/drivers/thermal/thermal_core.h
> > index 4e271016b7a9..bb8f8aee79eb 100644
> > --- a/drivers/thermal/thermal_core.h
> > +++ b/drivers/thermal/thermal_core.h
> > @@ -41,6 +41,15 @@ extern struct thermal_governor
> > *__governor_thermal_table_end[];
> >              __governor < __governor_thermal_table_end; \
> >              __governor++)
> > 
> > +int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *,
> > void *),
> > +                         void *);
> > +
> > +int for_each_thermal_cooling_device(int (*cb)(struct
> > thermal_cooling_device *,
> > +                                             void *), void *);
> > +
> > +int for_each_thermal_governor(int (*cb)(struct thermal_governor *,
> > void *),
> > +                             void *thermal_governor);
> > +
> >  struct thermal_attr {
> >         struct device_attribute attr;
> >         char name[THERMAL_NAME_LENGTH];
> > --
> > 2.17.1
> >