8 #include <linux/bitmap.h>
11 static int max_cpu_num;
12 static int max_node_num;
13 static int *cpunode_map;
15 static struct cpu_map *cpu_map__default_new(void)
20 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
24 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
27 for (i = 0; i < nr_cpus; ++i)
31 atomic_set(&cpus->refcnt, 1);
37 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
39 size_t payload_size = nr_cpus * sizeof(int);
40 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
44 memcpy(cpus->map, tmp_cpus, payload_size);
45 atomic_set(&cpus->refcnt, 1);
51 struct cpu_map *cpu_map__read(FILE *file)
53 struct cpu_map *cpus = NULL;
55 int *tmp_cpus = NULL, *tmp;
63 n = fscanf(file, "%u%c", &cpu, &sep);
67 int new_max = nr_cpus + cpu - prev - 1;
69 if (new_max >= max_entries) {
70 max_entries = new_max + MAX_NR_CPUS / 2;
71 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
78 tmp_cpus[nr_cpus++] = prev;
80 if (nr_cpus == max_entries) {
81 max_entries += MAX_NR_CPUS;
82 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
88 tmp_cpus[nr_cpus++] = cpu;
89 if (n == 2 && sep == '-')
93 if (n == 1 || sep == '\n')
98 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
100 cpus = cpu_map__default_new();
106 static struct cpu_map *cpu_map__read_all_cpu_map(void)
108 struct cpu_map *cpus = NULL;
111 onlnf = fopen("/sys/devices/system/cpu/online", "r");
113 return cpu_map__default_new();
115 cpus = cpu_map__read(onlnf);
120 struct cpu_map *cpu_map__new(const char *cpu_list)
122 struct cpu_map *cpus = NULL;
123 unsigned long start_cpu, end_cpu = 0;
126 int *tmp_cpus = NULL, *tmp;
130 return cpu_map__read_all_cpu_map();
132 if (!isdigit(*cpu_list))
135 while (isdigit(*cpu_list)) {
137 start_cpu = strtoul(cpu_list, &p, 0);
138 if (start_cpu >= INT_MAX
139 || (*p != '\0' && *p != ',' && *p != '-'))
145 end_cpu = strtoul(cpu_list, &p, 0);
147 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
150 if (end_cpu < start_cpu)
156 for (; start_cpu <= end_cpu; start_cpu++) {
157 /* check for duplicates */
158 for (i = 0; i < nr_cpus; i++)
159 if (tmp_cpus[i] == (int)start_cpu)
162 if (nr_cpus == max_entries) {
163 max_entries += MAX_NR_CPUS;
164 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
169 tmp_cpus[nr_cpus++] = (int)start_cpu;
178 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
180 cpus = cpu_map__default_new();
187 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
191 map = cpu_map__empty_new(cpus->nr);
195 for (i = 0; i < cpus->nr; i++) {
197 * Special treatment for -1, which is not real cpu number,
198 * and we need to use (int) -1 to initialize map[i],
199 * otherwise it would become 65535.
201 if (cpus->cpu[i] == (u16) -1)
204 map->map[i] = (int) cpus->cpu[i];
211 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
214 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
216 nr = bitmap_weight(mask->mask, nbits);
218 map = cpu_map__empty_new(nr);
222 for_each_set_bit(cpu, mask->mask, nbits)
229 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
231 if (data->type == PERF_CPU_MAP__CPUS)
232 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
234 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
237 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
242 cpu_map__snprint(map, buf, sizeof(buf));
243 return fprintf(fp, "%s\n", buf);
247 struct cpu_map *cpu_map__dummy_new(void)
249 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
254 atomic_set(&cpus->refcnt, 1);
260 struct cpu_map *cpu_map__empty_new(int nr)
262 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
268 for (i = 0; i < nr; i++)
271 atomic_set(&cpus->refcnt, 1);
277 static void cpu_map__delete(struct cpu_map *map)
280 WARN_ONCE(atomic_read(&map->refcnt) != 0,
281 "cpu_map refcnt unbalanced\n");
286 struct cpu_map *cpu_map__get(struct cpu_map *map)
289 atomic_inc(&map->refcnt);
293 void cpu_map__put(struct cpu_map *map)
295 if (map && atomic_dec_and_test(&map->refcnt))
296 cpu_map__delete(map);
299 static int cpu__get_topology_int(int cpu, const char *name, int *value)
303 snprintf(path, PATH_MAX,
304 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
306 return sysfs__read_int(path, value);
309 int cpu_map__get_socket_id(int cpu)
311 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
315 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
324 return cpu_map__get_socket_id(cpu);
327 static int cmp_ids(const void *a, const void *b)
329 return *(int *)a - *(int *)b;
332 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
333 int (*f)(struct cpu_map *map, int cpu, void *data),
340 /* allocate as much as possible */
341 c = calloc(1, sizeof(*c) + nr * sizeof(int));
345 for (cpu = 0; cpu < nr; cpu++) {
346 s1 = f(cpus, cpu, data);
347 for (s2 = 0; s2 < c->nr; s2++) {
348 if (s1 == c->map[s2])
356 /* ensure we process id in increasing order */
357 qsort(c->map, c->nr, sizeof(int), cmp_ids);
359 atomic_set(&c->refcnt, 1);
364 int cpu_map__get_core_id(int cpu)
366 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
370 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
379 cpu = cpu_map__get_core_id(cpu);
381 s = cpu_map__get_socket(map, idx, data);
386 * encode socket in upper 16 bits
387 * core_id is relative to socket, and
388 * we need a global id. So we combine
391 return (s << 16) | (cpu & 0xffff);
394 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
396 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
399 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
401 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
404 /* setup simple routines to easily access node numbers given a cpu number */
405 static int get_max_num(char *path, int *max)
411 if (filename__read_str(path, &buf, &num))
416 /* start on the right, to find highest node num */
418 if ((buf[num] == ',') || (buf[num] == '-')) {
423 if (sscanf(&buf[num], "%d", max) < 1) {
428 /* convert from 0-based to 1-based */
436 /* Determine highest possible cpu in the system for sparse allocation */
437 static void set_max_cpu_num(void)
446 mnt = sysfs__mountpoint();
450 /* get the highest possible cpu number for a sparse allocation */
451 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
452 if (ret == PATH_MAX) {
453 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
457 ret = get_max_num(path, &max_cpu_num);
461 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
464 /* Determine highest possible node in the system for sparse allocation */
465 static void set_max_node_num(void)
474 mnt = sysfs__mountpoint();
478 /* get the highest possible cpu number for a sparse allocation */
479 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
480 if (ret == PATH_MAX) {
481 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
485 ret = get_max_num(path, &max_node_num);
489 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
492 int cpu__max_node(void)
494 if (unlikely(!max_node_num))
500 int cpu__max_cpu(void)
502 if (unlikely(!max_cpu_num))
508 int cpu__get_node(int cpu)
510 if (unlikely(cpunode_map == NULL)) {
511 pr_debug("cpu_map not initialized\n");
515 return cpunode_map[cpu];
518 static int init_cpunode_map(void)
525 cpunode_map = calloc(max_cpu_num, sizeof(int));
527 pr_err("%s: calloc failed\n", __func__);
531 for (i = 0; i < max_cpu_num; i++)
537 int cpu__setup_cpunode_map(void)
539 struct dirent *dent1, *dent2;
541 unsigned int cpu, mem;
547 /* initialize globals */
548 if (init_cpunode_map())
551 mnt = sysfs__mountpoint();
555 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
557 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
561 dir1 = opendir(path);
565 /* walk tree and setup map */
566 while ((dent1 = readdir(dir1)) != NULL) {
567 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
570 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
572 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
579 while ((dent2 = readdir(dir2)) != NULL) {
580 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
582 cpunode_map[cpu] = mem;
590 bool cpu_map__has(struct cpu_map *cpus, int cpu)
592 return cpu_map__idx(cpus, cpu) != -1;
595 int cpu_map__idx(struct cpu_map *cpus, int cpu)
599 for (i = 0; i < cpus->nr; ++i) {
600 if (cpus->map[i] == cpu)
607 int cpu_map__cpu(struct cpu_map *cpus, int idx)
609 return cpus->map[idx];
612 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
614 int i, cpu, start = -1;
618 #define COMMA first ? "" : ","
620 for (i = 0; i < map->nr + 1; i++) {
621 bool last = i == map->nr;
623 cpu = last ? INT_MAX : map->map[i];
628 ret += snprintf(buf + ret, size - ret,
632 } else if (((i - start) != (cpu - map->map[start])) || last) {
636 ret += snprintf(buf + ret, size - ret,
640 ret += snprintf(buf + ret, size - ret,
642 map->map[start], map->map[end]);
651 pr_debug("cpumask list: %s\n", buf);