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
|
/************************************************************************
* This file is part of paramano. *
* *
* paramano 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; either version 3 of the *
* License, or (at your option) any later version. *
* *
* paramano 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 paramano. If not, see *
* <http://www.gnu.org/licenses/>. *
************************************************************************/
#include "paramano.h"
#define MAX_CORES 1000
#define MAX_FREQS 50
#define FREQ_LENGTH 14
static char freqs[MAX_CORES][MAX_FREQS][FREQ_LENGTH];
static int total_freqs; /* Number of freqs for core 0 */
/***********************************************************************
* Initialise surrounding variables, get available freqs etc
**********************************************************************/
void gf_init()
{
char freq_string[4096]; /* POSIX suggested line length. Source of error for CPUs with a huge number of freqs */
char *next_token = NULL;
unsigned int i = 0;
memset(freqs, '\0', sizeof(freqs));
for(i = 0; i < gc_number() && i < MAX_CORES; i++)
{
memset(freq_string, '\0', sizeof(freq_string) );
/* Get available governor freqs. If no governor, try next cpu */
if (gf_available(i, freq_string, sizeof(freq_string) ) == -1)
continue;
*strchrnul(freq_string, '\n') = '\0';
/* freq_string is a space separated list of freqs.
* Use strtok to find each */
next_token = strtok(freq_string, " \n");
total_freqs = 0;
do
{
strncpy(freqs[i][total_freqs], next_token, FREQ_LENGTH);
total_freqs++;
} while((next_token = strtok(NULL, " ")) != NULL);
}
/* Hit the limit of storage of cores' frequencies */
if (i == MAX_CORES)
info("Unable to add more than %d cores\n", MAX_CORES);
}
/***********************************************************************
* Return current frequency for core
**********************************************************************/
int gf_current(int core)
{
FILE* fd = NULL;
char buff[4096];
char path[1024];
int freq = 0;
snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", core);
if(!(fd = fopen(path, "r")))
return -1;
fgets(buff, 13, fd); /* FIXME magic */
freq = atoi(buff);
fclose(fd);
return freq;
}
/***********************************************************************
* Populate `out` with available frequencies for core
**********************************************************************/
int gf_available(int core, char* out, int size)
{
FILE* fd = NULL;
char path[1024];
snprintf(path, sizeof(path), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_frequencies", core);
if(!(fd = fopen(path, "r")))
return -1;
fgets(out, size, fd);
fclose(fd);
return 0;
}
/***********************************************************************
* Populate `out` with a formatted, units-added freq label for `freq`
**********************************************************************/
void gf_get_frequency_label(char *buffer, size_t max_size, int freq)
{
if(freq >= 1000000000) /* This, ladies and gentlement, is future-proofing */
snprintf(buffer, max_size, "%.2f THz", (double)freq/1000000000 );
else if(freq >= 1000000)
snprintf(buffer, max_size, "%.2f GHz", (double)freq/1000000 );
else if (freq >= 1000)
snprintf(buffer, max_size, "%.2f MHz", (double)freq/1000 );
else
snprintf(buffer, max_size, "%.2f KHz", (double)freq);
}
/***********************************************************************
* Return freq value at index for core, as a string
**********************************************************************/
char* gf_freqa(int core, int index)
{
return freqs[core][index];
}
/***********************************************************************
* Return freq value at index for core, as an int
**********************************************************************/
int gf_freqi(int core, int index)
{
return atoi(gf_freqa(core, index));
}
/***********************************************************************
* Return total number of frequencies
**********************************************************************/
unsigned int gf_number()
{
return total_freqs;
}
|