tools/perf/util/cpumap.c

   1 #include "util.h"
   2 #include "sysfs.h"
   3 #include "../perf.h"
   4 #include "cpumap.h"
   5 #include <assert.h>
   6 #include <stdio.h>
   7
   8 static struct cpu_map *cpu_map__default_new(void)
   9 {
  10         struct cpu_map *cpus;
  11         int nr_cpus;
  12
  13         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
  14         if (nr_cpus < 0)
  15                 return NULL;
  16
  17         cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
  18         if (cpus != NULL) {
  19                 int i;
  20                 for (i = 0; i < nr_cpus; ++i)
  21                         cpus->map[i] = i;
  22
  23                 cpus->nr = nr_cpus;
  24         }
  25
  26         return cpus;
  27 }
  28
  29 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
  30 {
  31         size_t payload_size = nr_cpus * sizeof(int);
  32         struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
  33
  34         if (cpus != NULL) {
  35                 cpus->nr = nr_cpus;
  36                 memcpy(cpus->map, tmp_cpus, payload_size);
  37         }
  38
  39         return cpus;
  40 }
  41
  42 struct cpu_map *cpu_map__read(FILE *file)
  43 {
  44         struct cpu_map *cpus = NULL;
  45         int nr_cpus = 0;
  46         int *tmp_cpus = NULL, *tmp;
  47         int max_entries = 0;
  48         int n, cpu, prev;
  49         char sep;
  50
  51         sep = 0;
  52         prev = -1;
  53         for (;;) {
  54                 n = fscanf(file, "%u%c", &cpu, &sep);
  55                 if (n <= 0)
  56                         break;
  57                 if (prev >= 0) {
  58                         int new_max = nr_cpus + cpu - prev - 1;
  59
  60                         if (new_max >= max_entries) {
  61                                 max_entries = new_max + MAX_NR_CPUS / 2;
  62                                 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
  63                                 if (tmp == NULL)
  64                                         goto out_free_tmp;
  65                                 tmp_cpus = tmp;
  66                         }
  67
  68                         while (++prev < cpu)
  69                                 tmp_cpus[nr_cpus++] = prev;
  70                 }
  71                 if (nr_cpus == max_entries) {
  72                         max_entries += MAX_NR_CPUS;
  73                         tmp = realloc(tmp_cpus, max_entries * sizeof(int));
  74                         if (tmp == NULL)
  75                                 goto out_free_tmp;
  76                         tmp_cpus = tmp;
  77                 }
  78
  79                 tmp_cpus[nr_cpus++] = cpu;
  80                 if (n == 2 && sep == '-')
  81                         prev = cpu;
  82                 else
  83                         prev = -1;
  84                 if (n == 1 || sep == '\n')
  85                         break;
  86         }
  87
  88         if (nr_cpus > 0)
  89                 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
  90         else
  91                 cpus = cpu_map__default_new();
  92 out_free_tmp:
  93         free(tmp_cpus);
  94         return cpus;
  95 }
  96
  97 static struct cpu_map *cpu_map__read_all_cpu_map(void)
  98 {
  99         struct cpu_map *cpus = NULL;
 100         FILE *onlnf;
 101
 102         onlnf = fopen("/sys/devices/system/cpu/online", "r");
 103         if (!onlnf)
 104                 return cpu_map__default_new();
 105
 106         cpus = cpu_map__read(onlnf);
 107         fclose(onlnf);
 108         return cpus;
 109 }
 110
 111 struct cpu_map *cpu_map__new(const char *cpu_list)
 112 {
 113         struct cpu_map *cpus = NULL;
 114         unsigned long start_cpu, end_cpu = 0;
 115         char *p = NULL;
 116         int i, nr_cpus = 0;
 117         int *tmp_cpus = NULL, *tmp;
 118         int max_entries = 0;
 119
 120         if (!cpu_list)
 121                 return cpu_map__read_all_cpu_map();
 122
 123         if (!isdigit(*cpu_list))
 124                 goto out;
 125
 126         while (isdigit(*cpu_list)) {
 127                 p = NULL;
 128                 start_cpu = strtoul(cpu_list, &p, 0);
 129                 if (start_cpu >= INT_MAX
 130                     || (*p != '\0' && *p != ',' && *p != '-'))
 131                         goto invalid;
 132
 133                 if (*p == '-') {
 134                         cpu_list = ++p;
 135                         p = NULL;
 136                         end_cpu = strtoul(cpu_list, &p, 0);
 137
 138                         if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
 139                                 goto invalid;
 140
 141                         if (end_cpu < start_cpu)
 142                                 goto invalid;
 143                 } else {
 144                         end_cpu = start_cpu;
 145                 }
 146
 147                 for (; start_cpu <= end_cpu; start_cpu++) {
 148                         /* check for duplicates */
 149                         for (i = 0; i < nr_cpus; i++)
 150                                 if (tmp_cpus[i] == (int)start_cpu)
 151                                         goto invalid;
 152
 153                         if (nr_cpus == max_entries) {
 154                                 max_entries += MAX_NR_CPUS;
 155                                 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
 156                                 if (tmp == NULL)
 157                                         goto invalid;
 158                                 tmp_cpus = tmp;
 159                         }
 160                         tmp_cpus[nr_cpus++] = (int)start_cpu;
 161                 }
 162                 if (*p)
 163                         ++p;
 164
 165                 cpu_list = p;
 166         }
 167
 168         if (nr_cpus > 0)
 169                 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
 170         else
 171                 cpus = cpu_map__default_new();
 172 invalid:
 173         free(tmp_cpus);
 174 out:
 175         return cpus;
 176 }
 177
 178 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
 179 {
 180         int i;
 181         size_t printed = fprintf(fp, "%d cpu%s: ",
 182                                  map->nr, map->nr > 1 ? "s" : "");
 183         for (i = 0; i < map->nr; ++i)
 184                 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
 185
 186         return printed + fprintf(fp, "\n");
 187 }
 188
 189 struct cpu_map *cpu_map__dummy_new(void)
 190 {
 191         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
 192
 193         if (cpus != NULL) {
 194                 cpus->nr = 1;
 195                 cpus->map[0] = -1;
 196         }
 197
 198         return cpus;
 199 }
 200
 201 void cpu_map__delete(struct cpu_map *map)
 202 {
 203         free(map);
 204 }
 205
 206 int cpu_map__get_socket(struct cpu_map *map, int idx)
 207 {
 208         FILE *fp;
 209         const char *mnt;
 210         char path[PATH_MAX];
 211         int cpu, ret;
 212
 213         if (idx > map->nr)
 214                 return -1;
 215
 216         cpu = map->map[idx];
 217
 218         mnt = sysfs_find_mountpoint();
 219         if (!mnt)
 220                 return -1;
 221
 222         sprintf(path,
 223                 "%s/devices/system/cpu/cpu%d/topology/physical_package_id",
 224                 mnt, cpu);
 225
 226         fp = fopen(path, "r");
 227         if (!fp)
 228                 return -1;
 229         ret = fscanf(fp, "%d", &cpu);
 230         fclose(fp);
 231         return ret == 1 ? cpu : -1;
 232 }
 233
 234 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
 235 {
 236         struct cpu_map *sock;
 237         int nr = cpus->nr;
 238         int cpu, s1, s2;
 239
 240         sock = calloc(1, sizeof(*sock) + nr * sizeof(int));
 241         if (!sock)
 242                 return -1;
 243
 244         for (cpu = 0; cpu < nr; cpu++) {
 245                 s1 = cpu_map__get_socket(cpus, cpu);
 246                 for (s2 = 0; s2 < sock->nr; s2++) {
 247                         if (s1 == sock->map[s2])
 248                                 break;
 249                 }
 250                 if (s2 == sock->nr) {
 251                         sock->map[sock->nr] = s1;
 252                         sock->nr++;
 253                 }
 254         }
 255         *sockp = sock;
 256         return 0;
 257 }