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Date: Sat, 15 Nov 2014 00:51:16 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Pavel Machek <pavel@....cz>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / Domains: Extract code to power off/on a PM domain
On Thursday, November 13, 2014 03:10:07 PM Pavel Machek wrote:
> On Mon 2014-11-10 19:39:19, Geert Uytterhoeven wrote:
> > PM domains are powered on/off from various places. Some callers do
> > latency measurements, others don't. Consolidate using two helper
> > functions, which always measure the latencies, and update the stored
> > latencies when needed.
> >
> > Other minor changes:
> > - Use pr_warn() instead of pr_warning(),
> > - There's no need to check genpd->name, %s handles NULL pointers fine,
> > - Make the warning format strings identical, to save memory.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> > Reviewed-by: Kevin Hilman <khilman@...aro.org>
>
> Acked-by: Pavel Machek <pavel@....cz>
Patch queued up for 3.19, thanks!
> > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> > index a841bab441147b3d..2fccf2c2575e4fa3 100644
> > --- a/drivers/base/power/domain.c
> > +++ b/drivers/base/power/domain.c
> > @@ -151,6 +151,59 @@ static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd)
> > genpd->cpuidle_data->idle_state->exit_latency = usecs64;
> > }
> >
> > +static int genpd_power_on(struct generic_pm_domain *genpd)
> > +{
> > + ktime_t time_start;
> > + s64 elapsed_ns;
> > + int ret;
> > +
> > + if (!genpd->power_on)
> > + return 0;
> > +
> > + time_start = ktime_get();
> > + ret = genpd->power_on(genpd);
> > + if (ret)
> > + return ret;
> > +
> > + elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
> > + if (elapsed_ns <= genpd->power_on_latency_ns)
> > + return ret;
> > +
> > + genpd->power_on_latency_ns = elapsed_ns;
> > + genpd->max_off_time_changed = true;
> > + genpd_recalc_cpu_exit_latency(genpd);
> > + pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
> > + genpd->name, "on", elapsed_ns);
> > +
> > + return ret;
> > +}
> > +
> > +static int genpd_power_off(struct generic_pm_domain *genpd)
> > +{
> > + ktime_t time_start;
> > + s64 elapsed_ns;
> > + int ret;
> > +
> > + if (!genpd->power_off)
> > + return 0;
> > +
> > + time_start = ktime_get();
> > + ret = genpd->power_off(genpd);
> > + if (ret == -EBUSY)
> > + return ret;
> > +
> > + elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
> > + if (elapsed_ns <= genpd->power_off_latency_ns)
> > + return ret;
> > +
> > + genpd->power_off_latency_ns = elapsed_ns;
> > + genpd->max_off_time_changed = true;
> > + pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
> > + genpd->name, "off", elapsed_ns);
> > +
> > + return ret;
> > +}
> > +
> > /**
> > * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
> > * @genpd: PM domain to power up.
> > @@ -222,25 +275,9 @@ static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
> > }
> > }
> >
> > - if (genpd->power_on) {
> > - ktime_t time_start = ktime_get();
> > - s64 elapsed_ns;
> > -
> > - ret = genpd->power_on(genpd);
> > - if (ret)
> > - goto err;
> > -
> > - elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
> > - if (elapsed_ns > genpd->power_on_latency_ns) {
> > - genpd->power_on_latency_ns = elapsed_ns;
> > - genpd->max_off_time_changed = true;
> > - genpd_recalc_cpu_exit_latency(genpd);
> > - if (genpd->name)
> > - pr_warning("%s: Power-on latency exceeded, "
> > - "new value %lld ns\n", genpd->name,
> > - elapsed_ns);
> > - }
> > - }
> > + ret = genpd_power_on(genpd);
> > + if (ret)
> > + goto err;
> >
> > out:
> > genpd_set_active(genpd);
> > @@ -529,16 +566,11 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
> > }
> >
> > if (genpd->power_off) {
> > - ktime_t time_start;
> > - s64 elapsed_ns;
> > -
> > if (atomic_read(&genpd->sd_count) > 0) {
> > ret = -EBUSY;
> > goto out;
> > }
> >
> > - time_start = ktime_get();
> > -
> > /*
> > * If sd_count > 0 at this point, one of the subdomains hasn't
> > * managed to call pm_genpd_poweron() for the master yet after
> > @@ -547,21 +579,11 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
> > * the pm_genpd_poweron() restore power for us (this shouldn't
> > * happen very often).
> > */
> > - ret = genpd->power_off(genpd);
> > + ret = genpd_power_off(genpd);
> > if (ret == -EBUSY) {
> > genpd_set_active(genpd);
> > goto out;
> > }
> > -
> > - elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
> > - if (elapsed_ns > genpd->power_off_latency_ns) {
> > - genpd->power_off_latency_ns = elapsed_ns;
> > - genpd->max_off_time_changed = true;
> > - if (genpd->name)
> > - pr_warning("%s: Power-off latency exceeded, "
> > - "new value %lld ns\n", genpd->name,
> > - elapsed_ns);
> > - }
> > }
> >
> > genpd->status = GPD_STATE_POWER_OFF;
> > @@ -796,8 +818,7 @@ static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
> > || atomic_read(&genpd->sd_count) > 0)
> > return;
> >
> > - if (genpd->power_off)
> > - genpd->power_off(genpd);
> > + genpd_power_off(genpd);
> >
> > genpd->status = GPD_STATE_POWER_OFF;
> >
> > @@ -828,8 +849,7 @@ static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd)
> > genpd_sd_counter_inc(link->master);
> > }
> >
> > - if (genpd->power_on)
> > - genpd->power_on(genpd);
> > + genpd_power_on(genpd);
> >
> > genpd->status = GPD_STATE_ACTIVE;
> > }
> > @@ -1251,8 +1271,7 @@ static int pm_genpd_restore_noirq(struct device *dev)
> > * If the domain was off before the hibernation, make
> > * sure it will be off going forward.
> > */
> > - if (genpd->power_off)
> > - genpd->power_off(genpd);
> > + genpd_power_off(genpd);
> >
> > return 0;
> > }
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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