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ac5a181d06
This more or less is a renaming and moving of functions and should not
introduce any functional change.
cpupower was built from cpufrequtils (which had a C library providing easy
access to cpu frequency platform info). In the meantime it got enhanced
by quite some neat cpuidle userspace tools.
Now the cpu idle functions have been separated and added to the cpupower.so
library.
So beside an already existing public header file:
cpufreq.h
cpupower now also exports these cpu idle functions in:
cpuidle.h
Here again pasted for better review of the interfaces:
======================================
int cpuidle_is_state_disabled(unsigned int cpu,
unsigned int idlestate);
int cpuidle_state_disable(unsigned int cpu, unsigned int idlestate,
unsigned int disable);
unsigned long cpuidle_state_latency(unsigned int cpu,
unsigned int idlestate);
unsigned long cpuidle_state_usage(unsigned int cpu,
unsigned int idlestate);
unsigned long long cpuidle_state_time(unsigned int cpu,
unsigned int idlestate);
char *cpuidle_state_name(unsigned int cpu,
unsigned int idlestate);
char *cpuidle_state_desc(unsigned int cpu,
unsigned int idlestate);
unsigned int cpuidle_state_count(unsigned int cpu);
char *cpuidle_get_governor(void);
char *cpuidle_get_driver(void);
======================================
Signed-off-by: Thomas Renninger <trenn@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
217 lines
5.5 KiB
C
217 lines
5.5 KiB
C
/*
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* cpufreq.h - definitions for libcpufreq
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*
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* Copyright (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __CPUPOWER_CPUFREQ_H__
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#define __CPUPOWER_CPUFREQ_H__
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struct cpufreq_policy {
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unsigned long min;
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unsigned long max;
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char *governor;
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};
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struct cpufreq_available_governors {
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char *governor;
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struct cpufreq_available_governors *next;
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struct cpufreq_available_governors *first;
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};
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struct cpufreq_available_frequencies {
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unsigned long frequency;
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struct cpufreq_available_frequencies *next;
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struct cpufreq_available_frequencies *first;
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};
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struct cpufreq_affected_cpus {
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unsigned int cpu;
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struct cpufreq_affected_cpus *next;
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struct cpufreq_affected_cpus *first;
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};
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struct cpufreq_stats {
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unsigned long frequency;
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unsigned long long time_in_state;
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struct cpufreq_stats *next;
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struct cpufreq_stats *first;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* determine current CPU frequency
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* - _kernel variant means kernel's opinion of CPU frequency
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* - _hardware variant means actual hardware CPU frequency,
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* which is only available to root.
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*
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* returns 0 on failure, else frequency in kHz.
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*/
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unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
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unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
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#define cpufreq_get(cpu) cpufreq_get_freq_kernel(cpu);
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/* determine CPU transition latency
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*
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* returns 0 on failure, else transition latency in 10^(-9) s = nanoseconds
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*/
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unsigned long cpufreq_get_transition_latency(unsigned int cpu);
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/* determine hardware CPU frequency limits
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*
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* These may be limited further by thermal, energy or other
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* considerations by cpufreq policy notifiers in the kernel.
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*/
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int cpufreq_get_hardware_limits(unsigned int cpu,
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unsigned long *min,
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unsigned long *max);
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/* determine CPUfreq driver used
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*
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* Remember to call cpufreq_put_driver when no longer needed
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* to avoid memory leakage, please.
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*/
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char *cpufreq_get_driver(unsigned int cpu);
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void cpufreq_put_driver(char *ptr);
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/* determine CPUfreq policy currently used
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*
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* Remember to call cpufreq_put_policy when no longer needed
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* to avoid memory leakage, please.
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*/
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struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
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void cpufreq_put_policy(struct cpufreq_policy *policy);
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/* determine CPUfreq governors currently available
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*
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* may be modified by modprobe'ing or rmmod'ing other governors. Please
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* free allocated memory by calling cpufreq_put_available_governors
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* after use.
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*/
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struct cpufreq_available_governors
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*cpufreq_get_available_governors(unsigned int cpu);
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void cpufreq_put_available_governors(
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struct cpufreq_available_governors *first);
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/* determine CPU frequency states available
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*
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* Only present on _some_ ->target() cpufreq drivers. For information purposes
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* only. Please free allocated memory by calling
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* cpufreq_put_available_frequencies after use.
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*/
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struct cpufreq_available_frequencies
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*cpufreq_get_available_frequencies(unsigned int cpu);
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void cpufreq_put_available_frequencies(
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struct cpufreq_available_frequencies *first);
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/* determine affected CPUs
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*
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* Remember to call cpufreq_put_affected_cpus when no longer needed
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* to avoid memory leakage, please.
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*/
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struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
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int cpu);
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void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
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/* determine related CPUs
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*
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* Remember to call cpufreq_put_related_cpus when no longer needed
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* to avoid memory leakage, please.
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*/
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struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
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int cpu);
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void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
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/* determine stats for cpufreq subsystem
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*
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* This is not available in all kernel versions or configurations.
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*/
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struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
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unsigned long long *total_time);
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void cpufreq_put_stats(struct cpufreq_stats *stats);
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unsigned long cpufreq_get_transitions(unsigned int cpu);
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/* set new cpufreq policy
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*
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* Tries to set the passed policy as new policy as close as possible,
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* but results may differ depending e.g. on governors being available.
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*/
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int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
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/* modify a policy by only changing min/max freq or governor
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*
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* Does not check whether result is what was intended.
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*/
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int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
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int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
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int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
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/* set a specific frequency
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*
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* Does only work if userspace governor can be used and no external
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* interference (other calls to this function or to set/modify_policy)
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* occurs. Also does not work on ->range() cpufreq drivers.
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*/
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int cpufreq_set_frequency(unsigned int cpu,
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unsigned long target_frequency);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CPUFREQ_H */
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