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From: "Yuan, Perry" <Perry.Yuan@amd.com>
To: "Limonciello, Mario" <Mario.Limonciello@amd.com>,
	"rafael.j.wysocki@intel.com" <rafael.j.wysocki@intel.com>,
	"Huang, Ray" <Ray.Huang@amd.com>,
	"viresh.kumar@linaro.org" <viresh.kumar@linaro.org>
Cc: "Sharma, Deepak" <Deepak.Sharma@amd.com>,
	"Fontenot, Nathan" <Nathan.Fontenot@amd.com>,
	"Deucher, Alexander" <Alexander.Deucher@amd.com>,
	"Huang, Shimmer" <Shimmer.Huang@amd.com>,
	"Du, Xiaojian" <Xiaojian.Du@amd.com>,
	"Meng, Li (Jassmine)" <Li.Meng@amd.com>,
	"Karny, Wyes" <Wyes.Karny@amd.com>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v4 7/9] cpufreq: amd-pstate: add frequency dynamic boost sysfs control
Date: Wed, 30 Nov 2022 17:13:08 +0000	[thread overview]
Message-ID: <DM4PR12MB5278FB5C2CC4595823DDD9F79C159@DM4PR12MB5278.namprd12.prod.outlook.com> (raw)
In-Reply-To: <8901dfd7-cdf4-1f1d-5d34-be57e74112de@amd.com>

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[AMD Official Use Only - General]



> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@amd.com>
> Sent: Tuesday, November 15, 2022 6:30 AM
> To: Yuan, Perry <Perry.Yuan@amd.com>; rafael.j.wysocki@intel.com; Huang,
> Ray <Ray.Huang@amd.com>; viresh.kumar@linaro.org
> Cc: Sharma, Deepak <Deepak.Sharma@amd.com>; Fontenot, Nathan
> <Nathan.Fontenot@amd.com>; Deucher, Alexander
> <Alexander.Deucher@amd.com>; Huang, Shimmer
> <Shimmer.Huang@amd.com>; Du, Xiaojian <Xiaojian.Du@amd.com>; Meng,
> Li (Jassmine) <Li.Meng@amd.com>; Karny, Wyes <Wyes.Karny@amd.com>;
> linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v4 7/9] cpufreq: amd-pstate: add frequency dynamic
> boost sysfs control
> 
> On 11/10/2022 11:58, Perry Yuan wrote:
> > 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@amd.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 645706d65173..b71bfbbb7639
> 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -765,12 +765,46 @@ static ssize_t
> show_energy_performance_preference(
> >   	return  sprintf(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 sprintf(buf, "%u\n", cppc_boost);
> 
> For new code I believe you should use the new helper sysfs_emit() instead.

Make sense, changed in v5.
Thanks .

Perry. 

> 
> > +}
> > +
> > +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,
> > @@ -788,6 +822,15 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
> >   	NULL,
> >   };
> >
> > +static struct attribute *pstate_global_attributes[] = {
> > +	&boost.attr,
> > +	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;
> > @@ -1398,9 +1441,28 @@ 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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  reply	other threads:[~2022-11-30 17:15 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-10 17:58 [PATCH v4 0/9] Implement AMD Pstate EPP Driver Perry Yuan
2022-11-10 17:58 ` [PATCH v4 1/9] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-11-10 17:58 ` [PATCH v4 2/9] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-11-10 17:58 ` [PATCH v4 3/9] cpufreq: amd-pstate: change amd-pstate driver to be built-in type Perry Yuan
2022-11-14 22:46   ` Limonciello, Mario
2022-11-15  2:02     ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 4/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-11-14 22:40   ` Limonciello, Mario
2022-11-30 17:12     ` Yuan, Perry
2022-12-02  8:18     ` Yuan, Perry
2022-11-17 14:02   ` Wyes Karny
2022-11-18  3:54     ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 5/9] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-11-10 17:58 ` [PATCH v4 6/9] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-11-10 17:58 ` [PATCH v4 7/9] cpufreq: amd-pstate: add frequency dynamic boost sysfs control Perry Yuan
2022-11-14 22:30   ` Limonciello, Mario
2022-11-30 17:13     ` Yuan, Perry [this message]
2022-11-10 17:58 ` [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry Perry Yuan
2022-11-14 22:30   ` Limonciello, Mario
2022-11-30 17:13     ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 9/9] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-11-14 22:29   ` Limonciello, Mario
2022-12-02  8:20     ` Yuan, Perry

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