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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
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -02007static struct cpu_map *cpu_map__default_new(void)
Paul Mackerrasa12b51c2010-03-10 20:36:09 +11008{
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -02009 struct cpu_map *cpus;
10 int nr_cpus;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110011
12 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020013 if (nr_cpus < 0)
14 return NULL;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110015
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020016 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
17 if (cpus != NULL) {
18 int i;
19 for (i = 0; i < nr_cpus; ++i)
20 cpus->map[i] = i;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110021
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020022 cpus->nr = nr_cpus;
23 }
24
25 return cpus;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110026}
27
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020028static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110029{
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020030 size_t payload_size = nr_cpus * sizeof(int);
31 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
32
33 if (cpus != NULL) {
34 cpus->nr = nr_cpus;
35 memcpy(cpus->map, tmp_cpus, payload_size);
36 }
37
38 return cpus;
39}
40
41static struct cpu_map *cpu_map__read_all_cpu_map(void)
42{
43 struct cpu_map *cpus = NULL;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110044 FILE *onlnf;
45 int nr_cpus = 0;
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020046 int *tmp_cpus = NULL, *tmp;
47 int max_entries = 0;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110048 int n, cpu, prev;
49 char sep;
50
51 onlnf = fopen("/sys/devices/system/cpu/online", "r");
52 if (!onlnf)
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020053 return cpu_map__default_new();
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110054
55 sep = 0;
56 prev = -1;
57 for (;;) {
58 n = fscanf(onlnf, "%u%c", &cpu, &sep);
59 if (n <= 0)
60 break;
61 if (prev >= 0) {
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020062 int new_max = nr_cpus + cpu - prev - 1;
63
64 if (new_max >= max_entries) {
65 max_entries = new_max + MAX_NR_CPUS / 2;
66 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
67 if (tmp == NULL)
68 goto out_free_tmp;
69 tmp_cpus = tmp;
70 }
71
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110072 while (++prev < cpu)
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020073 tmp_cpus[nr_cpus++] = prev;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110074 }
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020075 if (nr_cpus == max_entries) {
76 max_entries += MAX_NR_CPUS;
77 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
78 if (tmp == NULL)
79 goto out_free_tmp;
80 tmp_cpus = tmp;
81 }
82
83 tmp_cpus[nr_cpus++] = cpu;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110084 if (n == 2 && sep == '-')
85 prev = cpu;
86 else
87 prev = -1;
88 if (n == 1 || sep == '\n')
89 break;
90 }
Paul Mackerrasa12b51c2010-03-10 20:36:09 +110091
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -020092 if (nr_cpus > 0)
93 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
94 else
95 cpus = cpu_map__default_new();
96out_free_tmp:
97 free(tmp_cpus);
98 fclose(onlnf);
99 return cpus;
Paul Mackerrasa12b51c2010-03-10 20:36:09 +1100100}
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200101
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200102struct cpu_map *cpu_map__new(const char *cpu_list)
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200103{
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200104 struct cpu_map *cpus = NULL;
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200105 unsigned long start_cpu, end_cpu = 0;
106 char *p = NULL;
107 int i, nr_cpus = 0;
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200108 int *tmp_cpus = NULL, *tmp;
109 int max_entries = 0;
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200110
111 if (!cpu_list)
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200112 return cpu_map__read_all_cpu_map();
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200113
114 if (!isdigit(*cpu_list))
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200115 goto out;
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200116
117 while (isdigit(*cpu_list)) {
118 p = NULL;
119 start_cpu = strtoul(cpu_list, &p, 0);
120 if (start_cpu >= INT_MAX
121 || (*p != '\0' && *p != ',' && *p != '-'))
122 goto invalid;
123
124 if (*p == '-') {
125 cpu_list = ++p;
126 p = NULL;
127 end_cpu = strtoul(cpu_list, &p, 0);
128
129 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
130 goto invalid;
131
132 if (end_cpu < start_cpu)
133 goto invalid;
134 } else {
135 end_cpu = start_cpu;
136 }
137
138 for (; start_cpu <= end_cpu; start_cpu++) {
139 /* check for duplicates */
140 for (i = 0; i < nr_cpus; i++)
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200141 if (tmp_cpus[i] == (int)start_cpu)
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200142 goto invalid;
143
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200144 if (nr_cpus == max_entries) {
145 max_entries += MAX_NR_CPUS;
146 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
147 if (tmp == NULL)
148 goto invalid;
149 tmp_cpus = tmp;
150 }
151 tmp_cpus[nr_cpus++] = (int)start_cpu;
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200152 }
153 if (*p)
154 ++p;
155
156 cpu_list = p;
157 }
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200158
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200159 if (nr_cpus > 0)
160 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
161 else
162 cpus = cpu_map__default_new();
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200163invalid:
Arnaldo Carvalho de Melo60d567e2011-01-03 17:49:48 -0200164 free(tmp_cpus);
165out:
166 return cpus;
167}
168
169struct cpu_map *cpu_map__dummy_new(void)
170{
171 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
172
173 if (cpus != NULL) {
174 cpus->nr = 1;
175 cpus->map[0] = -1;
176 }
177
178 return cpus;
Stephane Eranianc45c6ea2010-05-28 12:00:01 +0200179}