10 static struct cpu_map *cpu_map__default_new(void)
15 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
19 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
22 for (i = 0; i < nr_cpus; ++i)
26 atomic_set(&cpus->refcnt, 1);
32 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
34 size_t payload_size = nr_cpus * sizeof(int);
35 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
39 memcpy(cpus->map, tmp_cpus, payload_size);
40 atomic_set(&cpus->refcnt, 1);
46 struct cpu_map *cpu_map__read(FILE *file)
48 struct cpu_map *cpus = NULL;
50 int *tmp_cpus = NULL, *tmp;
58 n = fscanf(file, "%u%c", &cpu, &sep);
62 int new_max = nr_cpus + cpu - prev - 1;
64 if (new_max >= max_entries) {
65 max_entries = new_max + MAX_NR_CPUS / 2;
66 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
73 tmp_cpus[nr_cpus++] = prev;
75 if (nr_cpus == max_entries) {
76 max_entries += MAX_NR_CPUS;
77 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
83 tmp_cpus[nr_cpus++] = cpu;
84 if (n == 2 && sep == '-')
88 if (n == 1 || sep == '\n')
93 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
95 cpus = cpu_map__default_new();
101 static struct cpu_map *cpu_map__read_all_cpu_map(void)
103 struct cpu_map *cpus = NULL;
106 onlnf = fopen("/sys/devices/system/cpu/online", "r");
108 return cpu_map__default_new();
110 cpus = cpu_map__read(onlnf);
115 struct cpu_map *cpu_map__new(const char *cpu_list)
117 struct cpu_map *cpus = NULL;
118 unsigned long start_cpu, end_cpu = 0;
121 int *tmp_cpus = NULL, *tmp;
125 return cpu_map__read_all_cpu_map();
127 if (!isdigit(*cpu_list))
130 while (isdigit(*cpu_list)) {
132 start_cpu = strtoul(cpu_list, &p, 0);
133 if (start_cpu >= INT_MAX
134 || (*p != '\0' && *p != ',' && *p != '-'))
140 end_cpu = strtoul(cpu_list, &p, 0);
142 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
145 if (end_cpu < start_cpu)
151 for (; start_cpu <= end_cpu; start_cpu++) {
152 /* check for duplicates */
153 for (i = 0; i < nr_cpus; i++)
154 if (tmp_cpus[i] == (int)start_cpu)
157 if (nr_cpus == max_entries) {
158 max_entries += MAX_NR_CPUS;
159 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
164 tmp_cpus[nr_cpus++] = (int)start_cpu;
173 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
175 cpus = cpu_map__default_new();
182 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
185 size_t printed = fprintf(fp, "%d cpu%s: ",
186 map->nr, map->nr > 1 ? "s" : "");
187 for (i = 0; i < map->nr; ++i)
188 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
190 return printed + fprintf(fp, "\n");
193 struct cpu_map *cpu_map__dummy_new(void)
195 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
200 atomic_set(&cpus->refcnt, 1);
206 static void cpu_map__delete(struct cpu_map *map)
209 WARN_ONCE(atomic_read(&map->refcnt) != 0,
210 "cpu_map refcnt unbalanced\n");
215 struct cpu_map *cpu_map__get(struct cpu_map *map)
218 atomic_inc(&map->refcnt);
222 void cpu_map__put(struct cpu_map *map)
224 if (map && atomic_dec_and_test(&map->refcnt))
225 cpu_map__delete(map);
228 int cpu_map__get_socket_id(int cpu)
235 mnt = sysfs__mountpoint();
239 snprintf(path, PATH_MAX,
240 "%s/devices/system/cpu/cpu%d/topology/physical_package_id",
243 fp = fopen(path, "r");
246 ret = fscanf(fp, "%d", &socket_id);
249 return ret == 1 ? socket_id : -1;
252 int cpu_map__get_socket(struct cpu_map *map, int idx)
261 return cpu_map__get_socket_id(cpu);
264 static int cmp_ids(const void *a, const void *b)
266 return *(int *)a - *(int *)b;
269 static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
270 int (*f)(struct cpu_map *map, int cpu))
276 /* allocate as much as possible */
277 c = calloc(1, sizeof(*c) + nr * sizeof(int));
281 for (cpu = 0; cpu < nr; cpu++) {
283 for (s2 = 0; s2 < c->nr; s2++) {
284 if (s1 == c->map[s2])
292 /* ensure we process id in increasing order */
293 qsort(c->map, c->nr, sizeof(int), cmp_ids);
295 atomic_set(&cpus->refcnt, 1);
300 int cpu_map__get_core_id(int cpu)
307 mnt = sysfs__mountpoint();
311 snprintf(path, PATH_MAX,
312 "%s/devices/system/cpu/cpu%d/topology/core_id",
315 fp = fopen(path, "r");
318 ret = fscanf(fp, "%d", &core_id);
321 return ret == 1 ? core_id : -1;
324 int cpu_map__get_core(struct cpu_map *map, int idx)
333 cpu = cpu_map__get_core_id(cpu);
335 s = cpu_map__get_socket(map, idx);
340 * encode socket in upper 16 bits
341 * core_id is relative to socket, and
342 * we need a global id. So we combine
345 return (s << 16) | (cpu & 0xffff);
348 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
350 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket);
353 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
355 return cpu_map__build_map(cpus, corep, cpu_map__get_core);
358 /* setup simple routines to easily access node numbers given a cpu number */
359 static int get_max_num(char *path, int *max)
365 if (filename__read_str(path, &buf, &num))
370 /* start on the right, to find highest node num */
372 if ((buf[num] == ',') || (buf[num] == '-')) {
377 if (sscanf(&buf[num], "%d", max) < 1) {
382 /* convert from 0-based to 1-based */
390 /* Determine highest possible cpu in the system for sparse allocation */
391 static void set_max_cpu_num(void)
400 mnt = sysfs__mountpoint();
404 /* get the highest possible cpu number for a sparse allocation */
405 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
406 if (ret == PATH_MAX) {
407 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
411 ret = get_max_num(path, &max_cpu_num);
415 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
418 /* Determine highest possible node in the system for sparse allocation */
419 static void set_max_node_num(void)
428 mnt = sysfs__mountpoint();
432 /* get the highest possible cpu number for a sparse allocation */
433 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
434 if (ret == PATH_MAX) {
435 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
439 ret = get_max_num(path, &max_node_num);
443 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
446 static int init_cpunode_map(void)
453 cpunode_map = calloc(max_cpu_num, sizeof(int));
455 pr_err("%s: calloc failed\n", __func__);
459 for (i = 0; i < max_cpu_num; i++)
465 int cpu__setup_cpunode_map(void)
467 struct dirent *dent1, *dent2;
469 unsigned int cpu, mem;
475 /* initialize globals */
476 if (init_cpunode_map())
479 mnt = sysfs__mountpoint();
483 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
485 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
489 dir1 = opendir(path);
493 /* walk tree and setup map */
494 while ((dent1 = readdir(dir1)) != NULL) {
495 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
498 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
500 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
507 while ((dent2 = readdir(dir2)) != NULL) {
508 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
510 cpunode_map[cpu] = mem;