213 lines
5.3 KiB
C
Executable file
213 lines
5.3 KiB
C
Executable file
/*
|
|
* cpufreq.h - definitions for libcpufreq
|
|
*
|
|
* Copyright (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef __CPUPOWER_CPUFREQ_H__
|
|
#define __CPUPOWER_CPUFREQ_H__
|
|
|
|
struct cpufreq_policy {
|
|
unsigned long min;
|
|
unsigned long max;
|
|
char *governor;
|
|
};
|
|
|
|
struct cpufreq_available_governors {
|
|
char *governor;
|
|
struct cpufreq_available_governors *next;
|
|
struct cpufreq_available_governors *first;
|
|
};
|
|
|
|
struct cpufreq_available_frequencies {
|
|
unsigned long frequency;
|
|
struct cpufreq_available_frequencies *next;
|
|
struct cpufreq_available_frequencies *first;
|
|
};
|
|
|
|
|
|
struct cpufreq_affected_cpus {
|
|
unsigned int cpu;
|
|
struct cpufreq_affected_cpus *next;
|
|
struct cpufreq_affected_cpus *first;
|
|
};
|
|
|
|
struct cpufreq_stats {
|
|
unsigned long frequency;
|
|
unsigned long long time_in_state;
|
|
struct cpufreq_stats *next;
|
|
struct cpufreq_stats *first;
|
|
};
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* determine current CPU frequency
|
|
* - _kernel variant means kernel's opinion of CPU frequency
|
|
* - _hardware variant means actual hardware CPU frequency,
|
|
* which is only available to root.
|
|
*
|
|
* returns 0 on failure, else frequency in kHz.
|
|
*/
|
|
|
|
unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
|
|
|
|
unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
|
|
|
|
#define cpufreq_get(cpu) cpufreq_get_freq_kernel(cpu);
|
|
|
|
|
|
/* determine CPU transition latency
|
|
*
|
|
* returns 0 on failure, else transition latency in 10^(-9) s = nanoseconds
|
|
*/
|
|
unsigned long cpufreq_get_transition_latency(unsigned int cpu);
|
|
|
|
|
|
/* determine hardware CPU frequency limits
|
|
*
|
|
* These may be limited further by thermal, energy or other
|
|
* considerations by cpufreq policy notifiers in the kernel.
|
|
*/
|
|
|
|
int cpufreq_get_hardware_limits(unsigned int cpu,
|
|
unsigned long *min,
|
|
unsigned long *max);
|
|
|
|
|
|
/* determine CPUfreq driver used
|
|
*
|
|
* Remember to call cpufreq_put_driver when no longer needed
|
|
* to avoid memory leakage, please.
|
|
*/
|
|
|
|
char *cpufreq_get_driver(unsigned int cpu);
|
|
|
|
void cpufreq_put_driver(char *ptr);
|
|
|
|
|
|
/* determine CPUfreq policy currently used
|
|
*
|
|
* Remember to call cpufreq_put_policy when no longer needed
|
|
* to avoid memory leakage, please.
|
|
*/
|
|
|
|
|
|
struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
|
|
|
|
void cpufreq_put_policy(struct cpufreq_policy *policy);
|
|
|
|
|
|
/* determine CPUfreq governors currently available
|
|
*
|
|
* may be modified by modprobe'ing or rmmod'ing other governors. Please
|
|
* free allocated memory by calling cpufreq_put_available_governors
|
|
* after use.
|
|
*/
|
|
|
|
|
|
struct cpufreq_available_governors
|
|
*cpufreq_get_available_governors(unsigned int cpu);
|
|
|
|
void cpufreq_put_available_governors(
|
|
struct cpufreq_available_governors *first);
|
|
|
|
|
|
/* determine CPU frequency states available
|
|
*
|
|
* Only present on _some_ ->target() cpufreq drivers. For information purposes
|
|
* only. Please free allocated memory by calling
|
|
* cpufreq_put_available_frequencies after use.
|
|
*/
|
|
|
|
struct cpufreq_available_frequencies
|
|
*cpufreq_get_available_frequencies(unsigned int cpu);
|
|
|
|
void cpufreq_put_available_frequencies(
|
|
struct cpufreq_available_frequencies *first);
|
|
|
|
|
|
/* determine affected CPUs
|
|
*
|
|
* Remember to call cpufreq_put_affected_cpus when no longer needed
|
|
* to avoid memory leakage, please.
|
|
*/
|
|
|
|
struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
|
|
int cpu);
|
|
|
|
void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
|
|
|
|
|
|
/* determine related CPUs
|
|
*
|
|
* Remember to call cpufreq_put_related_cpus when no longer needed
|
|
* to avoid memory leakage, please.
|
|
*/
|
|
|
|
struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
|
|
int cpu);
|
|
|
|
void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
|
|
|
|
|
|
/* determine stats for cpufreq subsystem
|
|
*
|
|
* This is not available in all kernel versions or configurations.
|
|
*/
|
|
|
|
struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
|
|
unsigned long long *total_time);
|
|
|
|
void cpufreq_put_stats(struct cpufreq_stats *stats);
|
|
|
|
unsigned long cpufreq_get_transitions(unsigned int cpu);
|
|
|
|
|
|
/* set new cpufreq policy
|
|
*
|
|
* Tries to set the passed policy as new policy as close as possible,
|
|
* but results may differ depending e.g. on governors being available.
|
|
*/
|
|
|
|
int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
|
|
|
|
|
|
/* modify a policy by only changing min/max freq or governor
|
|
*
|
|
* Does not check whether result is what was intended.
|
|
*/
|
|
|
|
int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
|
|
int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
|
|
int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
|
|
|
|
|
|
/* set a specific frequency
|
|
*
|
|
* Does only work if userspace governor can be used and no external
|
|
* interference (other calls to this function or to set/modify_policy)
|
|
* occurs. Also does not work on ->range() cpufreq drivers.
|
|
*/
|
|
|
|
int cpufreq_set_frequency(unsigned int cpu,
|
|
unsigned long target_frequency);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _CPUFREQ_H */
|