224 lines
5.8 KiB
C
224 lines
5.8 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 _CPUFREQ_H
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#define _CPUFREQ_H 1
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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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/*
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* returns 0 if the specified CPU is present (it doesn't say
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* whether it is online!), and an error value if not.
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*/
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extern int cpufreq_cpu_exists(unsigned int cpu);
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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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extern unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
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extern 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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extern 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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extern 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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extern char *cpufreq_get_driver(unsigned int cpu);
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extern 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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extern struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
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extern 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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extern struct cpufreq_available_governors
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*cpufreq_get_available_governors(unsigned int cpu);
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extern 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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extern struct cpufreq_available_frequencies
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*cpufreq_get_available_frequencies(unsigned int cpu);
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extern 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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extern struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
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int cpu);
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extern 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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extern struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
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int cpu);
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extern 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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extern struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
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unsigned long long *total_time);
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extern void cpufreq_put_stats(struct cpufreq_stats *stats);
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extern 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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extern 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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extern int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
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extern int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
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extern 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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extern 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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