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
|
/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _CPUFREQ_H
#define _CPUFREQ_H 1
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
/*
* returns 0 if the specified CPU is present (it doesn't say
* whether it is online!), and an error value if not.
*/
extern int cpufreq_cpu_exists(unsigned int cpu);
/* 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.
*/
extern unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
extern 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
*/
extern 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.
*/
extern 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.
*/
extern char * cpufreq_get_driver(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_policy * cpufreq_get_policy(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_available_governors * cpufreq_get_available_governors(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_available_frequencies * cpufreq_get_available_frequencies(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_affected_cpus * cpufreq_get_affected_cpus(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_affected_cpus * cpufreq_get_related_cpus(unsigned int cpu);
extern 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.
*/
extern struct cpufreq_stats * cpufreq_get_stats(unsigned int cpu, unsigned long long *total_time);
extern void cpufreq_put_stats(struct cpufreq_stats *stats);
extern 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.
*/
extern 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.
*/
extern int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
extern int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
extern 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.
*/
extern int cpufreq_set_frequency(unsigned int cpu, unsigned long target_frequency);
#ifdef __cplusplus
}
#endif
#endif /* _CPUFREQ_H */
|
