8 #include <linux/bitmap.h>
11 static struct cpu_map *cpu_map__default_new(void)
16 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
20 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
23 for (i = 0; i < nr_cpus; ++i)
27 atomic_set(&cpus->refcnt, 1);
33 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
35 size_t payload_size = nr_cpus * sizeof(int);
36 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
40 memcpy(cpus->map, tmp_cpus, payload_size);
41 atomic_set(&cpus->refcnt, 1);
47 struct cpu_map *cpu_map__read(FILE *file)
49 struct cpu_map *cpus = NULL;
51 int *tmp_cpus = NULL, *tmp;
59 n = fscanf(file, "%u%c", &cpu, &sep);
63 int new_max = nr_cpus + cpu - prev - 1;
65 if (new_max >= max_entries) {
66 max_entries = new_max + MAX_NR_CPUS / 2;
67 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
74 tmp_cpus[nr_cpus++] = prev;
76 if (nr_cpus == max_entries) {
77 max_entries += MAX_NR_CPUS;
78 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
84 tmp_cpus[nr_cpus++] = cpu;
85 if (n == 2 && sep == '-')
89 if (n == 1 || sep == '\n')
94 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
96 cpus = cpu_map__default_new();
102 static struct cpu_map *cpu_map__read_all_cpu_map(void)
104 struct cpu_map *cpus = NULL;
107 onlnf = fopen("/sys/devices/system/cpu/online", "r");
109 return cpu_map__default_new();
111 cpus = cpu_map__read(onlnf);
116 struct cpu_map *cpu_map__new(const char *cpu_list)
118 struct cpu_map *cpus = NULL;
119 unsigned long start_cpu, end_cpu = 0;
122 int *tmp_cpus = NULL, *tmp;
126 return cpu_map__read_all_cpu_map();
128 if (!isdigit(*cpu_list))
131 while (isdigit(*cpu_list)) {
133 start_cpu = strtoul(cpu_list, &p, 0);
134 if (start_cpu >= INT_MAX
135 || (*p != '\0' && *p != ',' && *p != '-'))
141 end_cpu = strtoul(cpu_list, &p, 0);
143 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
146 if (end_cpu < start_cpu)
152 for (; start_cpu <= end_cpu; start_cpu++) {
153 /* check for duplicates */
154 for (i = 0; i < nr_cpus; i++)
155 if (tmp_cpus[i] == (int)start_cpu)
158 if (nr_cpus == max_entries) {
159 max_entries += MAX_NR_CPUS;
160 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
165 tmp_cpus[nr_cpus++] = (int)start_cpu;
174 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
176 cpus = cpu_map__default_new();
183 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
187 map = cpu_map__empty_new(cpus->nr);
191 for (i = 0; i < cpus->nr; i++) {
193 * Special treatment for -1, which is not real cpu number,
194 * and we need to use (int) -1 to initialize map[i],
195 * otherwise it would become 65535.
197 if (cpus->cpu[i] == (u16) -1)
200 map->map[i] = (int) cpus->cpu[i];
207 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
210 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
212 nr = bitmap_weight(mask->mask, nbits);
214 map = cpu_map__empty_new(nr);
218 for_each_set_bit(cpu, mask->mask, nbits)
225 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
227 if (data->type == PERF_CPU_MAP__CPUS)
228 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
230 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
233 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
236 size_t printed = fprintf(fp, "%d cpu%s: ",
237 map->nr, map->nr > 1 ? "s" : "");
238 for (i = 0; i < map->nr; ++i)
239 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
241 return printed + fprintf(fp, "\n");
244 struct cpu_map *cpu_map__dummy_new(void)
246 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
251 atomic_set(&cpus->refcnt, 1);
257 struct cpu_map *cpu_map__empty_new(int nr)
259 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
265 for (i = 0; i < nr; i++)
268 atomic_set(&cpus->refcnt, 1);
274 static void cpu_map__delete(struct cpu_map *map)
277 WARN_ONCE(atomic_read(&map->refcnt) != 0,
278 "cpu_map refcnt unbalanced\n");
283 struct cpu_map *cpu_map__get(struct cpu_map *map)
286 atomic_inc(&map->refcnt);
290 void cpu_map__put(struct cpu_map *map)
292 if (map && atomic_dec_and_test(&map->refcnt))
293 cpu_map__delete(map);
296 static int cpu__get_topology_int(int cpu, const char *name, int *value)
300 snprintf(path, PATH_MAX,
301 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
303 return sysfs__read_int(path, value);
306 int cpu_map__get_socket_id(int cpu)
308 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
312 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
321 return cpu_map__get_socket_id(cpu);
324 static int cmp_ids(const void *a, const void *b)
326 return *(int *)a - *(int *)b;
329 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
330 int (*f)(struct cpu_map *map, int cpu, void *data),
337 /* allocate as much as possible */
338 c = calloc(1, sizeof(*c) + nr * sizeof(int));
342 for (cpu = 0; cpu < nr; cpu++) {
343 s1 = f(cpus, cpu, data);
344 for (s2 = 0; s2 < c->nr; s2++) {
345 if (s1 == c->map[s2])
353 /* ensure we process id in increasing order */
354 qsort(c->map, c->nr, sizeof(int), cmp_ids);
356 atomic_set(&c->refcnt, 1);
361 int cpu_map__get_core_id(int cpu)
363 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
367 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
376 cpu = cpu_map__get_core_id(cpu);
378 s = cpu_map__get_socket(map, idx, data);
383 * encode socket in upper 16 bits
384 * core_id is relative to socket, and
385 * we need a global id. So we combine
388 return (s << 16) | (cpu & 0xffff);
391 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
393 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
396 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
398 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
401 /* setup simple routines to easily access node numbers given a cpu number */
402 static int get_max_num(char *path, int *max)
408 if (filename__read_str(path, &buf, &num))
413 /* start on the right, to find highest node num */
415 if ((buf[num] == ',') || (buf[num] == '-')) {
420 if (sscanf(&buf[num], "%d", max) < 1) {
425 /* convert from 0-based to 1-based */
433 /* Determine highest possible cpu in the system for sparse allocation */
434 static void set_max_cpu_num(void)
443 mnt = sysfs__mountpoint();
447 /* get the highest possible cpu number for a sparse allocation */
448 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
449 if (ret == PATH_MAX) {
450 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
454 ret = get_max_num(path, &max_cpu_num);
458 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
461 /* Determine highest possible node in the system for sparse allocation */
462 static void set_max_node_num(void)
471 mnt = sysfs__mountpoint();
475 /* get the highest possible cpu number for a sparse allocation */
476 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
477 if (ret == PATH_MAX) {
478 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
482 ret = get_max_num(path, &max_node_num);
486 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
489 static int init_cpunode_map(void)
496 cpunode_map = calloc(max_cpu_num, sizeof(int));
498 pr_err("%s: calloc failed\n", __func__);
502 for (i = 0; i < max_cpu_num; i++)
508 int cpu__setup_cpunode_map(void)
510 struct dirent *dent1, *dent2;
512 unsigned int cpu, mem;
518 /* initialize globals */
519 if (init_cpunode_map())
522 mnt = sysfs__mountpoint();
526 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
528 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
532 dir1 = opendir(path);
536 /* walk tree and setup map */
537 while ((dent1 = readdir(dir1)) != NULL) {
538 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
541 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
543 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
550 while ((dent2 = readdir(dir2)) != NULL) {
551 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
553 cpunode_map[cpu] = mem;