Commit ec4e3326 authored by Huang Rui's avatar Huang Rui Committed by Rafael J. Wysocki
Browse files

cpufreq: amd-pstate: Add AMD P-State frequencies attributes 



Introduce sysfs attributes to get the different level processor
frequencies.

Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 41271016

drivers/cpufreq/amd-pstate.c

+47 −0
Original line number Diff line number Diff line
@@ -509,6 +509,52 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy) 
	return 0;

}



/* Sysfs attributes */



/*

 * This frequency is to indicate the maximum hardware frequency.

 * If boost is not active but supported, the frequency will be larger than the

 * one in cpuinfo.

 */

static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,

					char *buf)

{

	int max_freq;

	struct amd_cpudata *cpudata;



	cpudata = policy->driver_data;



	max_freq = amd_get_max_freq(cpudata);

	if (max_freq < 0)

		return max_freq;



	return sprintf(&buf[0], "%u\n", max_freq);

}



static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy,

						     char *buf)

{

	int freq;

	struct amd_cpudata *cpudata;



	cpudata = policy->driver_data;



	freq = amd_get_lowest_nonlinear_freq(cpudata);

	if (freq < 0)

		return freq;



	return sprintf(&buf[0], "%u\n", freq);

}



cpufreq_freq_attr_ro(amd_pstate_max_freq);

cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);



static struct freq_attr *amd_pstate_attr[] = {

	&amd_pstate_max_freq,

	&amd_pstate_lowest_nonlinear_freq,

	NULL,

};



static struct cpufreq_driver amd_pstate_driver = {

	.flags		= CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,

	.verify		= amd_pstate_verify,
@@ -517,6 +563,7 @@ static struct cpufreq_driver amd_pstate_driver = { 
	.exit		= amd_pstate_cpu_exit,

	.set_boost	= amd_pstate_set_boost,

	.name		= "amd-pstate",

	.attr           = amd_pstate_attr,

};



static int __init amd_pstate_init(void)