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Message-ID: <DM4PR12MB5278A749B28544BF52F8D5E99C189@DM4PR12MB5278.namprd12.prod.outlook.com>
Date: Mon, 5 Dec 2022 15:19:00 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: "Limonciello, Mario" <Mario.Limonciello@....com>,
"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
"Huang, Ray" <Ray.Huang@....com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>
CC: "Sharma, Deepak" <Deepak.Sharma@....com>,
"Fontenot, Nathan" <Nathan.Fontenot@....com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Huang, Shimmer" <Shimmer.Huang@....com>,
"Du, Xiaojian" <Xiaojian.Du@....com>,
"Meng, Li (Jassmine)" <Li.Meng@....com>,
"Karny, Wyes" <Wyes.Karny@....com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 07/11] cpufreq: amd-pstate: add frequency dynamic boost
sysfs control
[AMD Official Use Only - General]
> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@....com>
> Sent: Saturday, December 3, 2022 12:00 AM
> To: Yuan, Perry <Perry.Yuan@....com>; rafael.j.wysocki@...el.com; Huang,
> Ray <Ray.Huang@....com>; viresh.kumar@...aro.org
> Cc: Sharma, Deepak <Deepak.Sharma@....com>; Fontenot, Nathan
> <Nathan.Fontenot@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>; Meng,
> Li (Jassmine) <Li.Meng@....com>; Karny, Wyes <Wyes.Karny@....com>;
> linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v6 07/11] cpufreq: amd-pstate: add frequency dynamic
> boost sysfs control
>
> On 12/2/2022 01:47, Perry Yuan wrote:
> > From: Perry Yuan <Perry.Yuan@....com>
> >
> > Add one sysfs entry to control the CPU cores frequency boost state The
> > attribute file can allow user to set max performance boosted or
> > keeping at normal perf level.
> >
> > Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> > ---
> > drivers/cpufreq/amd-pstate.c | 66
> ++++++++++++++++++++++++++++++++++--
> > 1 file changed, 64 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/cpufreq/amd-pstate.c
> > b/drivers/cpufreq/amd-pstate.c index b3a82cee2e83..6936df6e8642
> 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -774,12 +774,46 @@ static ssize_t
> show_energy_performance_preference(
> > return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]);
> > }
> >
> > +static void amd_pstate_update_policies(void) {
> > + int cpu;
> > +
> > + for_each_possible_cpu(cpu)
> > + cpufreq_update_policy(cpu);
> > +}
> > +
> > +static ssize_t show_boost(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf) {
> > + return sysfs_emit(buf, "%u\n", cppc_boost); }
> > +
> > +static ssize_t store_boost(struct kobject *a,
> > + struct kobj_attribute *b,
> > + const char *buf, size_t count) {
> > + bool new_state;
> > + int ret;
> > +
> > + ret = kstrtobool(buf, &new_state);
> > + if (ret)
> > + return -EINVAL;
> > +
> > + mutex_lock(&amd_pstate_driver_lock);
> > + cppc_boost = !!new_state;
> > + amd_pstate_update_policies();
> > + mutex_unlock(&amd_pstate_driver_lock);
> > +
> > + return count;
> > +}
> > +
> > cpufreq_freq_attr_ro(amd_pstate_max_freq);
> > cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
> >
> > cpufreq_freq_attr_ro(amd_pstate_highest_perf);
> > cpufreq_freq_attr_rw(energy_performance_preference);
> > cpufreq_freq_attr_ro(energy_performance_available_preferences);
> > +define_one_global_rw(boost);
> >
> > static struct freq_attr *amd_pstate_attr[] = {
> > &amd_pstate_max_freq,
> > @@ -797,6 +831,15 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
> > NULL,
> > };
> >
> > +static struct attribute *pstate_global_attributes[] = {
> > + &boost.attr,
>
> Make sure you update the documentation for the new sysfs attribute.
>
Indeed , I missed to update the sysfs docs for this .
Will update kernel doc in V7 soon.
Perry.
> > + NULL
> > +};
> > +
> > +static const struct attribute_group amd_pstate_global_attr_group = {
> > + .attrs = pstate_global_attributes,
> > +};
> > +
> > static inline void update_boost_state(void)
> > {
> > u64 misc_en;
> > @@ -1415,9 +1458,28 @@ static int __init amd_pstate_init(void)
> >
> > ret = cpufreq_register_driver(default_pstate_driver);
> > if (ret)
> > - pr_err("failed to register amd pstate driver with
> return %d\n",
> > - ret);
> > + pr_err("failed to register driver with return %d\n", ret);
> > +
> > + amd_pstate_kobj = kobject_create_and_add("amd-pstate",
> &cpu_subsys.dev_root->kobj);
> > + if (!amd_pstate_kobj) {
> > + ret = -EINVAL;
> > + pr_err("global sysfs registration failed.\n");
> > + goto kobject_free;
> > + }
> > +
> > + ret = sysfs_create_group(amd_pstate_kobj,
> &amd_pstate_global_attr_group);
> > + if (ret) {
> > + pr_err("sysfs attribute export failed with error %d.\n", ret);
> > + goto global_attr_free;
> > + }
> > +
> > + return ret;
> >
> > +global_attr_free:
> > + kobject_put(amd_pstate_kobj);
> > +kobject_free:
> > + kfree(cpudata);
> > + cpufreq_unregister_driver(default_pstate_driver);
> > return ret;
> > }
> > device_initcall(amd_pstate_init);
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