summaryrefslogtreecommitdiffstats
path: root/tools/power/cpupower/lib/cpufreq.h
blob: 2f3c840358063c17348efcc13621d6b5d71bdb79 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  cpufreq.h - definitions for libcpufreq
 *
 *  Copyright (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
 */

#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_frequencies after use.
 */

struct cpufreq_available_frequencies
*cpufreq_get_available_frequencies(unsigned int cpu);

void cpufreq_put_available_frequencies(
		struct cpufreq_available_frequencies *first);

struct cpufreq_available_frequencies
*cpufreq_get_boost_frequencies(unsigned int cpu);

void cpufreq_put_boost_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);

/*
 * get the sysfs value from specific table
 *
 * Read the value with the sysfs file name from specific table. Does
 * only work if the cpufreq driver has the specific sysfs interfaces.
 */

unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
						 const char **table,
						 unsigned int index,
						 unsigned int size);

#ifdef __cplusplus
}
#endif

#endif /* _CPUFREQ_H */