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 #include <stdlib.h> 8 9 static struct cpu_map *cpu_map__default_new(void) 10 { 11 struct cpu_map *cpus; 12 int nr_cpus; 13 14 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); 15 if (nr_cpus < 0) 16 return NULL; 17 18 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int)); 19 if (cpus != NULL) { 20 int i; 21 for (i = 0; i < nr_cpus; ++i) 22 cpus->map[i] = i; 23 24 cpus->nr = nr_cpus; 25 } 26 27 return cpus; 28 } 29 30 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus) 31 { 32 size_t payload_size = nr_cpus * sizeof(int); 33 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size); 34 35 if (cpus != NULL) { 36 cpus->nr = nr_cpus; 37 memcpy(cpus->map, tmp_cpus, payload_size); 38 } 39 40 return cpus; 41 } 42 43 struct cpu_map *cpu_map__read(FILE *file) 44 { 45 struct cpu_map *cpus = NULL; 46 int nr_cpus = 0; 47 int *tmp_cpus = NULL, *tmp; 48 int max_entries = 0; 49 int n, cpu, prev; 50 char sep; 51 52 sep = 0; 53 prev = -1; 54 for (;;) { 55 n = fscanf(file, "%u%c", &cpu, &sep); 56 if (n <= 0) 57 break; 58 if (prev >= 0) { 59 int new_max = nr_cpus + cpu - prev - 1; 60 61 if (new_max >= max_entries) { 62 max_entries = new_max + MAX_NR_CPUS / 2; 63 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 64 if (tmp == NULL) 65 goto out_free_tmp; 66 tmp_cpus = tmp; 67 } 68 69 while (++prev < cpu) 70 tmp_cpus[nr_cpus++] = prev; 71 } 72 if (nr_cpus == max_entries) { 73 max_entries += MAX_NR_CPUS; 74 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 75 if (tmp == NULL) 76 goto out_free_tmp; 77 tmp_cpus = tmp; 78 } 79 80 tmp_cpus[nr_cpus++] = cpu; 81 if (n == 2 && sep == '-') 82 prev = cpu; 83 else 84 prev = -1; 85 if (n == 1 || sep == '\n') 86 break; 87 } 88 89 if (nr_cpus > 0) 90 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 91 else 92 cpus = cpu_map__default_new(); 93 out_free_tmp: 94 free(tmp_cpus); 95 return cpus; 96 } 97 98 static struct cpu_map *cpu_map__read_all_cpu_map(void) 99 { 100 struct cpu_map *cpus = NULL; 101 FILE *onlnf; 102 103 onlnf = fopen("/sys/devices/system/cpu/online", "r"); 104 if (!onlnf) 105 return cpu_map__default_new(); 106 107 cpus = cpu_map__read(onlnf); 108 fclose(onlnf); 109 return cpus; 110 } 111 112 struct cpu_map *cpu_map__new(const char *cpu_list) 113 { 114 struct cpu_map *cpus = NULL; 115 unsigned long start_cpu, end_cpu = 0; 116 char *p = NULL; 117 int i, nr_cpus = 0; 118 int *tmp_cpus = NULL, *tmp; 119 int max_entries = 0; 120 121 if (!cpu_list) 122 return cpu_map__read_all_cpu_map(); 123 124 if (!isdigit(*cpu_list)) 125 goto out; 126 127 while (isdigit(*cpu_list)) { 128 p = NULL; 129 start_cpu = strtoul(cpu_list, &p, 0); 130 if (start_cpu >= INT_MAX 131 || (*p != '\0' && *p != ',' && *p != '-')) 132 goto invalid; 133 134 if (*p == '-') { 135 cpu_list = ++p; 136 p = NULL; 137 end_cpu = strtoul(cpu_list, &p, 0); 138 139 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ',')) 140 goto invalid; 141 142 if (end_cpu < start_cpu) 143 goto invalid; 144 } else { 145 end_cpu = start_cpu; 146 } 147 148 for (; start_cpu <= end_cpu; start_cpu++) { 149 /* check for duplicates */ 150 for (i = 0; i < nr_cpus; i++) 151 if (tmp_cpus[i] == (int)start_cpu) 152 goto invalid; 153 154 if (nr_cpus == max_entries) { 155 max_entries += MAX_NR_CPUS; 156 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 157 if (tmp == NULL) 158 goto invalid; 159 tmp_cpus = tmp; 160 } 161 tmp_cpus[nr_cpus++] = (int)start_cpu; 162 } 163 if (*p) 164 ++p; 165 166 cpu_list = p; 167 } 168 169 if (nr_cpus > 0) 170 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 171 else 172 cpus = cpu_map__default_new(); 173 invalid: 174 free(tmp_cpus); 175 out: 176 return cpus; 177 } 178 179 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp) 180 { 181 int i; 182 size_t printed = fprintf(fp, "%d cpu%s: ", 183 map->nr, map->nr > 1 ? "s" : ""); 184 for (i = 0; i < map->nr; ++i) 185 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]); 186 187 return printed + fprintf(fp, "\n"); 188 } 189 190 struct cpu_map *cpu_map__dummy_new(void) 191 { 192 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int)); 193 194 if (cpus != NULL) { 195 cpus->nr = 1; 196 cpus->map[0] = -1; 197 } 198 199 return cpus; 200 } 201 202 void cpu_map__delete(struct cpu_map *map) 203 { 204 free(map); 205 } 206 207 int cpu_map__get_socket(struct cpu_map *map, int idx) 208 { 209 FILE *fp; 210 const char *mnt; 211 char path[PATH_MAX]; 212 int cpu, ret; 213 214 if (idx > map->nr) 215 return -1; 216 217 cpu = map->map[idx]; 218 219 mnt = sysfs_find_mountpoint(); 220 if (!mnt) 221 return -1; 222 223 snprintf(path, PATH_MAX, 224 "%s/devices/system/cpu/cpu%d/topology/physical_package_id", 225 mnt, cpu); 226 227 fp = fopen(path, "r"); 228 if (!fp) 229 return -1; 230 ret = fscanf(fp, "%d", &cpu); 231 fclose(fp); 232 return ret == 1 ? cpu : -1; 233 } 234 235 static int cmp_ids(const void *a, const void *b) 236 { 237 return *(int *)a - *(int *)b; 238 } 239 240 static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, 241 int (*f)(struct cpu_map *map, int cpu)) 242 { 243 struct cpu_map *c; 244 int nr = cpus->nr; 245 int cpu, s1, s2; 246 247 /* allocate as much as possible */ 248 c = calloc(1, sizeof(*c) + nr * sizeof(int)); 249 if (!c) 250 return -1; 251 252 for (cpu = 0; cpu < nr; cpu++) { 253 s1 = f(cpus, cpu); 254 for (s2 = 0; s2 < c->nr; s2++) { 255 if (s1 == c->map[s2]) 256 break; 257 } 258 if (s2 == c->nr) { 259 c->map[c->nr] = s1; 260 c->nr++; 261 } 262 } 263 /* ensure we process id in increasing order */ 264 qsort(c->map, c->nr, sizeof(int), cmp_ids); 265 266 *res = c; 267 return 0; 268 } 269 270 int cpu_map__get_core(struct cpu_map *map, int idx) 271 { 272 FILE *fp; 273 const char *mnt; 274 char path[PATH_MAX]; 275 int cpu, ret, s; 276 277 if (idx > map->nr) 278 return -1; 279 280 cpu = map->map[idx]; 281 282 mnt = sysfs_find_mountpoint(); 283 if (!mnt) 284 return -1; 285 286 snprintf(path, PATH_MAX, 287 "%s/devices/system/cpu/cpu%d/topology/core_id", 288 mnt, cpu); 289 290 fp = fopen(path, "r"); 291 if (!fp) 292 return -1; 293 ret = fscanf(fp, "%d", &cpu); 294 fclose(fp); 295 if (ret != 1) 296 return -1; 297 298 s = cpu_map__get_socket(map, idx); 299 if (s == -1) 300 return -1; 301 302 /* 303 * encode socket in upper 16 bits 304 * core_id is relative to socket, and 305 * we need a global id. So we combine 306 * socket+ core id 307 */ 308 return (s << 16) | (cpu & 0xffff); 309 } 310 311 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp) 312 { 313 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket); 314 } 315 316 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep) 317 { 318 return cpu_map__build_map(cpus, corep, cpu_map__get_core); 319 } 320
