linux-kernel - Re: [PATCH v4 2/3] drm/i915: Move on the new pm runtime interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAKfTPtBZqGY07mj2uKaMJXsOXfN708uJKSaiivXKZ5qdct0oZw@mail.gmail.com>
Date:   Fri, 21 Dec 2018 09:30:14 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        jani.nikula@...ux.intel.com,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        rodrigo.vivi@...el.com, David Airlie <airlied@...ux.ie>,
        "Intel graphics driver community testing & development" 
        <intel-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v4 2/3] drm/i915: Move on the new pm runtime interface

On Thu, 20 Dec 2018 at 23:04, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Thu, 20 Dec 2018 at 15:17, Vincent Guittot
> <vincent.guittot@...aro.org> wrote:
> >
> > Use the new pm runtime interface to get the accounted suspended time:
> > pm_runtime_accounted_time_get()
>
> pm_runtime_suspended_time()
>
> This change also makes quite some nice cleanups to the code, which is
> mostly because of converting to the new runtime PM API. I think the
> changelog deserves to state that, in some simple way.

ok
>
> >
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>
> Other than the minor things above:
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
>
> Kind regards
> Uffe
>
>
> > ---
> >  drivers/gpu/drm/i915/i915_pmu.c | 16 ++++++----------
> >  drivers/gpu/drm/i915/i915_pmu.h |  4 ++--
> >  2 files changed, 8 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> > index d6c8f8f..3f76f60 100644
> > --- a/drivers/gpu/drm/i915/i915_pmu.c
> > +++ b/drivers/gpu/drm/i915/i915_pmu.c
> > @@ -5,6 +5,7 @@
> >   */
> >
> >  #include <linux/irq.h>
> > +#include <linux/pm_runtime.h>
> >  #include "i915_pmu.h"
> >  #include "intel_ringbuffer.h"
> >  #include "i915_drv.h"
> > @@ -478,7 +479,6 @@ static u64 get_rc6(struct drm_i915_private *i915)
> >                  * counter value.
> >                  */
> >                 spin_lock_irqsave(&i915->pmu.lock, flags);
> > -               spin_lock(&kdev->power.lock);
> >
> >                 /*
> >                  * After the above branch intel_runtime_pm_get_if_in_use failed
> > @@ -491,16 +491,13 @@ static u64 get_rc6(struct drm_i915_private *i915)
> >                  * suspended and if not we cannot do better than report the last
> >                  * known RC6 value.
> >                  */
> > -               if (kdev->power.runtime_status == RPM_SUSPENDED) {
> > -                       if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
> > -                               i915->pmu.suspended_jiffies_last =
> > -                                                 kdev->power.suspended_jiffies;
> > +               if (pm_runtime_status_suspended(kdev)) {
> > +                       val = pm_runtime_suspended_time(kdev);
> >
> > -                       val = kdev->power.suspended_jiffies -
> > -                             i915->pmu.suspended_jiffies_last;
> > -                       val += jiffies - kdev->power.accounting_timestamp;
> > +                       if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
> > +                               i915->pmu.suspended_time_last = val;
> >
> > -                       val = jiffies_to_nsecs(val);
> > +                       val -= i915->pmu.suspended_time_last;
> >                         val += i915->pmu.sample[__I915_SAMPLE_RC6].cur;
> >
> >                         i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = val;
> > @@ -510,7 +507,6 @@ static u64 get_rc6(struct drm_i915_private *i915)
> >                         val = i915->pmu.sample[__I915_SAMPLE_RC6].cur;
> >                 }
> >
> > -               spin_unlock(&kdev->power.lock);
> >                 spin_unlock_irqrestore(&i915->pmu.lock, flags);
> >         }
> >
> > diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
> > index 7f164ca..3dc2a30 100644
> > --- a/drivers/gpu/drm/i915/i915_pmu.h
> > +++ b/drivers/gpu/drm/i915/i915_pmu.h
> > @@ -95,9 +95,9 @@ struct i915_pmu {
> >          */
> >         struct i915_pmu_sample sample[__I915_NUM_PMU_SAMPLERS];
> >         /**
> > -        * @suspended_jiffies_last: Cached suspend time from PM core.
> > +        * @suspended_time_last: Cached suspend time from PM core.
> >          */
> > -       unsigned long suspended_jiffies_last;
> > +       u64 suspended_time_last;
> >         /**
> >          * @i915_attr: Memory block holding device attributes.
> >          */
> > --
> > 2.7.4
> >