blob: 0f9b8d7a7d7e7d62f38c48ec8846251beb532918 [file] [log] [blame]
Paul Mackerrasa12b51c2010-03-10 20:36:09 +11001#include "util.h"
2#include "../perf.h"
3#include "cpumap.h"
4#include <assert.h>
5#include <stdio.h>
6
7int cpumap[MAX_NR_CPUS];
8
9static int default_cpu_map(void)
10{
11 int nr_cpus, i;
12
13 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
14 assert(nr_cpus <= MAX_NR_CPUS);
15 assert((int)nr_cpus >= 0);
16
17 for (i = 0; i < nr_cpus; ++i)
18 cpumap[i] = i;
19
20 return nr_cpus;
21}
22
Stephane Eranianc45c6ea2010-05-28 12:00:01 +020023static int read_all_cpu_map(void)
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110024{
25 FILE *onlnf;
26 int nr_cpus = 0;
27 int n, cpu, prev;
28 char sep;
29
30 onlnf = fopen("/sys/devices/system/cpu/online", "r");
31 if (!onlnf)
32 return default_cpu_map();
33
34 sep = 0;
35 prev = -1;
36 for (;;) {
37 n = fscanf(onlnf, "%u%c", &cpu, &sep);
38 if (n <= 0)
39 break;
40 if (prev >= 0) {
41 assert(nr_cpus + cpu - prev - 1 < MAX_NR_CPUS);
42 while (++prev < cpu)
43 cpumap[nr_cpus++] = prev;
44 }
45 assert (nr_cpus < MAX_NR_CPUS);
46 cpumap[nr_cpus++] = cpu;
47 if (n == 2 && sep == '-')
48 prev = cpu;
49 else
50 prev = -1;
51 if (n == 1 || sep == '\n')
52 break;
53 }
54 fclose(onlnf);
55 if (nr_cpus > 0)
56 return nr_cpus;
57
58 return default_cpu_map();
59}
Stephane Eranianc45c6ea2010-05-28 12:00:01 +020060
61int read_cpu_map(const char *cpu_list)
62{
63 unsigned long start_cpu, end_cpu = 0;
64 char *p = NULL;
65 int i, nr_cpus = 0;
66
67 if (!cpu_list)
68 return read_all_cpu_map();
69
70 if (!isdigit(*cpu_list))
71 goto invalid;
72
73 while (isdigit(*cpu_list)) {
74 p = NULL;
75 start_cpu = strtoul(cpu_list, &p, 0);
76 if (start_cpu >= INT_MAX
77 || (*p != '\0' && *p != ',' && *p != '-'))
78 goto invalid;
79
80 if (*p == '-') {
81 cpu_list = ++p;
82 p = NULL;
83 end_cpu = strtoul(cpu_list, &p, 0);
84
85 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
86 goto invalid;
87
88 if (end_cpu < start_cpu)
89 goto invalid;
90 } else {
91 end_cpu = start_cpu;
92 }
93
94 for (; start_cpu <= end_cpu; start_cpu++) {
95 /* check for duplicates */
96 for (i = 0; i < nr_cpus; i++)
97 if (cpumap[i] == (int)start_cpu)
98 goto invalid;
99
100 assert(nr_cpus < MAX_NR_CPUS);
101 cpumap[nr_cpus++] = (int)start_cpu;
102 }
103 if (*p)
104 ++p;
105
106 cpu_list = p;
107 }
108 if (nr_cpus > 0)
109 return nr_cpus;
110
111 return default_cpu_map();
112invalid:
113 return -1;
114}