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1// SPDX-License-Identifier: GPL-2.0
2#include <api/fs/fs.h>
3#include "cpumap.h"
4#include "debug.h"
5#include "event.h"
6#include <assert.h>
7#include <dirent.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <linux/bitmap.h>
11#include "asm/bug.h"
12
13#include <linux/ctype.h>
14#include <linux/zalloc.h>
15
16static int max_cpu_num;
17static int max_present_cpu_num;
18static int max_node_num;
19static int *cpunode_map;
20
21static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
22{
23 struct perf_cpu_map *map;
24
25 map = perf_cpu_map__empty_new(cpus->nr);
26 if (map) {
27 unsigned i;
28
29 for (i = 0; i < cpus->nr; i++) {
30 /*
31 * Special treatment for -1, which is not real cpu number,
32 * and we need to use (int) -1 to initialize map[i],
33 * otherwise it would become 65535.
34 */
35 if (cpus->cpu[i] == (u16) -1)
36 map->map[i] = -1;
37 else
38 map->map[i] = (int) cpus->cpu[i];
39 }
40 }
41
42 return map;
43}
44
45static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
46{
47 struct perf_cpu_map *map;
48 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
49
50 nr = bitmap_weight(mask->mask, nbits);
51
52 map = perf_cpu_map__empty_new(nr);
53 if (map) {
54 int cpu, i = 0;
55
56 for_each_set_bit(cpu, mask->mask, nbits)
57 map->map[i++] = cpu;
58 }
59 return map;
60
61}
62
63struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
64{
65 if (data->type == PERF_CPU_MAP__CPUS)
66 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
67 else
68 return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
69}
70
71size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
72{
73#define BUFSIZE 1024
74 char buf[BUFSIZE];
75
76 cpu_map__snprint(map, buf, sizeof(buf));
77 return fprintf(fp, "%s\n", buf);
78#undef BUFSIZE
79}
80
81struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
82{
83 struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
84
85 if (cpus != NULL) {
86 int i;
87
88 cpus->nr = nr;
89 for (i = 0; i < nr; i++)
90 cpus->map[i] = -1;
91
92 refcount_set(&cpus->refcnt, 1);
93 }
94
95 return cpus;
96}
97
98static int cpu__get_topology_int(int cpu, const char *name, int *value)
99{
100 char path[PATH_MAX];
101
102 snprintf(path, PATH_MAX,
103 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
104
105 return sysfs__read_int(path, value);
106}
107
108int cpu_map__get_socket_id(int cpu)
109{
110 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
111 return ret ?: value;
112}
113
114int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
115{
116 int cpu;
117
118 if (idx > map->nr)
119 return -1;
120
121 cpu = map->map[idx];
122
123 return cpu_map__get_socket_id(cpu);
124}
125
126static int cmp_ids(const void *a, const void *b)
127{
128 return *(int *)a - *(int *)b;
129}
130
131int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
132 int (*f)(struct perf_cpu_map *map, int cpu, void *data),
133 void *data)
134{
135 struct perf_cpu_map *c;
136 int nr = cpus->nr;
137 int cpu, s1, s2;
138
139 /* allocate as much as possible */
140 c = calloc(1, sizeof(*c) + nr * sizeof(int));
141 if (!c)
142 return -1;
143
144 for (cpu = 0; cpu < nr; cpu++) {
145 s1 = f(cpus, cpu, data);
146 for (s2 = 0; s2 < c->nr; s2++) {
147 if (s1 == c->map[s2])
148 break;
149 }
150 if (s2 == c->nr) {
151 c->map[c->nr] = s1;
152 c->nr++;
153 }
154 }
155 /* ensure we process id in increasing order */
156 qsort(c->map, c->nr, sizeof(int), cmp_ids);
157
158 refcount_set(&c->refcnt, 1);
159 *res = c;
160 return 0;
161}
162
163int cpu_map__get_die_id(int cpu)
164{
165 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
166
167 return ret ?: value;
168}
169
170int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
171{
172 int cpu, die_id, s;
173
174 if (idx > map->nr)
175 return -1;
176
177 cpu = map->map[idx];
178
179 die_id = cpu_map__get_die_id(cpu);
180 /* There is no die_id on legacy system. */
181 if (die_id == -1)
182 die_id = 0;
183
184 s = cpu_map__get_socket(map, idx, data);
185 if (s == -1)
186 return -1;
187
188 /*
189 * Encode socket in bit range 15:8
190 * die_id is relative to socket, and
191 * we need a global id. So we combine
192 * socket + die id
193 */
194 if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
195 return -1;
196
197 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
198 return -1;
199
200 return (s << 8) | (die_id & 0xff);
201}
202
203int cpu_map__get_core_id(int cpu)
204{
205 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
206 return ret ?: value;
207}
208
209int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
210{
211 int cpu, s_die;
212
213 if (idx > map->nr)
214 return -1;
215
216 cpu = map->map[idx];
217
218 cpu = cpu_map__get_core_id(cpu);
219
220 /* s_die is the combination of socket + die id */
221 s_die = cpu_map__get_die(map, idx, data);
222 if (s_die == -1)
223 return -1;
224
225 /*
226 * encode socket in bit range 31:24
227 * encode die id in bit range 23:16
228 * core_id is relative to socket and die,
229 * we need a global id. So we combine
230 * socket + die id + core id
231 */
232 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
233 return -1;
234
235 return (s_die << 16) | (cpu & 0xffff);
236}
237
238int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
239{
240 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
241}
242
243int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
244{
245 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
246}
247
248int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
249{
250 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
251}
252
253/* setup simple routines to easily access node numbers given a cpu number */
254static int get_max_num(char *path, int *max)
255{
256 size_t num;
257 char *buf;
258 int err = 0;
259
260 if (filename__read_str(path, &buf, &num))
261 return -1;
262
263 buf[num] = '\0';
264
265 /* start on the right, to find highest node num */
266 while (--num) {
267 if ((buf[num] == ',') || (buf[num] == '-')) {
268 num++;
269 break;
270 }
271 }
272 if (sscanf(&buf[num], "%d", max) < 1) {
273 err = -1;
274 goto out;
275 }
276
277 /* convert from 0-based to 1-based */
278 (*max)++;
279
280out:
281 free(buf);
282 return err;
283}
284
285/* Determine highest possible cpu in the system for sparse allocation */
286static void set_max_cpu_num(void)
287{
288 const char *mnt;
289 char path[PATH_MAX];
290 int ret = -1;
291
292 /* set up default */
293 max_cpu_num = 4096;
294 max_present_cpu_num = 4096;
295
296 mnt = sysfs__mountpoint();
297 if (!mnt)
298 goto out;
299
300 /* get the highest possible cpu number for a sparse allocation */
301 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
302 if (ret == PATH_MAX) {
303 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
304 goto out;
305 }
306
307 ret = get_max_num(path, &max_cpu_num);
308 if (ret)
309 goto out;
310
311 /* get the highest present cpu number for a sparse allocation */
312 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
313 if (ret == PATH_MAX) {
314 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
315 goto out;
316 }
317
318 ret = get_max_num(path, &max_present_cpu_num);
319
320out:
321 if (ret)
322 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
323}
324
325/* Determine highest possible node in the system for sparse allocation */
326static void set_max_node_num(void)
327{
328 const char *mnt;
329 char path[PATH_MAX];
330 int ret = -1;
331
332 /* set up default */
333 max_node_num = 8;
334
335 mnt = sysfs__mountpoint();
336 if (!mnt)
337 goto out;
338
339 /* get the highest possible cpu number for a sparse allocation */
340 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
341 if (ret == PATH_MAX) {
342 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
343 goto out;
344 }
345
346 ret = get_max_num(path, &max_node_num);
347
348out:
349 if (ret)
350 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
351}
352
353int cpu__max_node(void)
354{
355 if (unlikely(!max_node_num))
356 set_max_node_num();
357
358 return max_node_num;
359}
360
361int cpu__max_cpu(void)
362{
363 if (unlikely(!max_cpu_num))
364 set_max_cpu_num();
365
366 return max_cpu_num;
367}
368
369int cpu__max_present_cpu(void)
370{
371 if (unlikely(!max_present_cpu_num))
372 set_max_cpu_num();
373
374 return max_present_cpu_num;
375}
376
377
378int cpu__get_node(int cpu)
379{
380 if (unlikely(cpunode_map == NULL)) {
381 pr_debug("cpu_map not initialized\n");
382 return -1;
383 }
384
385 return cpunode_map[cpu];
386}
387
388static int init_cpunode_map(void)
389{
390 int i;
391
392 set_max_cpu_num();
393 set_max_node_num();
394
395 cpunode_map = calloc(max_cpu_num, sizeof(int));
396 if (!cpunode_map) {
397 pr_err("%s: calloc failed\n", __func__);
398 return -1;
399 }
400
401 for (i = 0; i < max_cpu_num; i++)
402 cpunode_map[i] = -1;
403
404 return 0;
405}
406
407int cpu__setup_cpunode_map(void)
408{
409 struct dirent *dent1, *dent2;
410 DIR *dir1, *dir2;
411 unsigned int cpu, mem;
412 char buf[PATH_MAX];
413 char path[PATH_MAX];
414 const char *mnt;
415 int n;
416
417 /* initialize globals */
418 if (init_cpunode_map())
419 return -1;
420
421 mnt = sysfs__mountpoint();
422 if (!mnt)
423 return 0;
424
425 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
426 if (n == PATH_MAX) {
427 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
428 return -1;
429 }
430
431 dir1 = opendir(path);
432 if (!dir1)
433 return 0;
434
435 /* walk tree and setup map */
436 while ((dent1 = readdir(dir1)) != NULL) {
437 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
438 continue;
439
440 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
441 if (n == PATH_MAX) {
442 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
443 continue;
444 }
445
446 dir2 = opendir(buf);
447 if (!dir2)
448 continue;
449 while ((dent2 = readdir(dir2)) != NULL) {
450 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
451 continue;
452 cpunode_map[cpu] = mem;
453 }
454 closedir(dir2);
455 }
456 closedir(dir1);
457 return 0;
458}
459
460bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
461{
462 return perf_cpu_map__idx(cpus, cpu) != -1;
463}
464
465int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
466{
467 return cpus->map[idx];
468}
469
470size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
471{
472 int i, cpu, start = -1;
473 bool first = true;
474 size_t ret = 0;
475
476#define COMMA first ? "" : ","
477
478 for (i = 0; i < map->nr + 1; i++) {
479 bool last = i == map->nr;
480
481 cpu = last ? INT_MAX : map->map[i];
482
483 if (start == -1) {
484 start = i;
485 if (last) {
486 ret += snprintf(buf + ret, size - ret,
487 "%s%d", COMMA,
488 map->map[i]);
489 }
490 } else if (((i - start) != (cpu - map->map[start])) || last) {
491 int end = i - 1;
492
493 if (start == end) {
494 ret += snprintf(buf + ret, size - ret,
495 "%s%d", COMMA,
496 map->map[start]);
497 } else {
498 ret += snprintf(buf + ret, size - ret,
499 "%s%d-%d", COMMA,
500 map->map[start], map->map[end]);
501 }
502 first = false;
503 start = i;
504 }
505 }
506
507#undef COMMA
508
509 pr_debug2("cpumask list: %s\n", buf);
510 return ret;
511}
512
513static char hex_char(unsigned char val)
514{
515 if (val < 10)
516 return val + '0';
517 if (val < 16)
518 return val - 10 + 'a';
519 return '?';
520}
521
522size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
523{
524 int i, cpu;
525 char *ptr = buf;
526 unsigned char *bitmap;
527 int last_cpu = cpu_map__cpu(map, map->nr - 1);
528
529 if (buf == NULL)
530 return 0;
531
532 bitmap = zalloc(last_cpu / 8 + 1);
533 if (bitmap == NULL) {
534 buf[0] = '\0';
535 return 0;
536 }
537
538 for (i = 0; i < map->nr; i++) {
539 cpu = cpu_map__cpu(map, i);
540 bitmap[cpu / 8] |= 1 << (cpu % 8);
541 }
542
543 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
544 unsigned char bits = bitmap[cpu / 8];
545
546 if (cpu % 8)
547 bits >>= 4;
548 else
549 bits &= 0xf;
550
551 *ptr++ = hex_char(bits);
552 if ((cpu % 32) == 0 && cpu > 0)
553 *ptr++ = ',';
554 }
555 *ptr = '\0';
556 free(bitmap);
557
558 buf[size - 1] = '\0';
559 return ptr - buf;
560}
561
562const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
563{
564 static const struct perf_cpu_map *online = NULL;
565
566 if (!online)
567 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
568
569 return online;
570}
1// SPDX-License-Identifier: GPL-2.0
2#include <api/fs/fs.h>
3#include "cpumap.h"
4#include "debug.h"
5#include "event.h"
6#include <assert.h>
7#include <dirent.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <linux/bitmap.h>
11#include "asm/bug.h"
12
13#include <linux/ctype.h>
14#include <linux/zalloc.h>
15
16static int max_cpu_num;
17static int max_present_cpu_num;
18static int max_node_num;
19static int *cpunode_map;
20
21static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
22{
23 struct perf_cpu_map *map;
24
25 map = perf_cpu_map__empty_new(cpus->nr);
26 if (map) {
27 unsigned i;
28
29 for (i = 0; i < cpus->nr; i++) {
30 /*
31 * Special treatment for -1, which is not real cpu number,
32 * and we need to use (int) -1 to initialize map[i],
33 * otherwise it would become 65535.
34 */
35 if (cpus->cpu[i] == (u16) -1)
36 map->map[i] = -1;
37 else
38 map->map[i] = (int) cpus->cpu[i];
39 }
40 }
41
42 return map;
43}
44
45static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
46{
47 struct perf_cpu_map *map;
48 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
49
50 nr = bitmap_weight(mask->mask, nbits);
51
52 map = perf_cpu_map__empty_new(nr);
53 if (map) {
54 int cpu, i = 0;
55
56 for_each_set_bit(cpu, mask->mask, nbits)
57 map->map[i++] = cpu;
58 }
59 return map;
60
61}
62
63struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
64{
65 if (data->type == PERF_CPU_MAP__CPUS)
66 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
67 else
68 return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
69}
70
71size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
72{
73#define BUFSIZE 1024
74 char buf[BUFSIZE];
75
76 cpu_map__snprint(map, buf, sizeof(buf));
77 return fprintf(fp, "%s\n", buf);
78#undef BUFSIZE
79}
80
81struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
82{
83 struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
84
85 if (cpus != NULL) {
86 int i;
87
88 cpus->nr = nr;
89 for (i = 0; i < nr; i++)
90 cpus->map[i] = -1;
91
92 refcount_set(&cpus->refcnt, 1);
93 }
94
95 return cpus;
96}
97
98static int cpu__get_topology_int(int cpu, const char *name, int *value)
99{
100 char path[PATH_MAX];
101
102 snprintf(path, PATH_MAX,
103 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
104
105 return sysfs__read_int(path, value);
106}
107
108int cpu_map__get_socket_id(int cpu)
109{
110 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
111 return ret ?: value;
112}
113
114int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
115{
116 int cpu;
117
118 if (idx > map->nr)
119 return -1;
120
121 cpu = map->map[idx];
122
123 return cpu_map__get_socket_id(cpu);
124}
125
126static int cmp_ids(const void *a, const void *b)
127{
128 return *(int *)a - *(int *)b;
129}
130
131int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
132 int (*f)(struct perf_cpu_map *map, int cpu, void *data),
133 void *data)
134{
135 struct perf_cpu_map *c;
136 int nr = cpus->nr;
137 int cpu, s1, s2;
138
139 /* allocate as much as possible */
140 c = calloc(1, sizeof(*c) + nr * sizeof(int));
141 if (!c)
142 return -1;
143
144 for (cpu = 0; cpu < nr; cpu++) {
145 s1 = f(cpus, cpu, data);
146 for (s2 = 0; s2 < c->nr; s2++) {
147 if (s1 == c->map[s2])
148 break;
149 }
150 if (s2 == c->nr) {
151 c->map[c->nr] = s1;
152 c->nr++;
153 }
154 }
155 /* ensure we process id in increasing order */
156 qsort(c->map, c->nr, sizeof(int), cmp_ids);
157
158 refcount_set(&c->refcnt, 1);
159 *res = c;
160 return 0;
161}
162
163int cpu_map__get_die_id(int cpu)
164{
165 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
166
167 return ret ?: value;
168}
169
170int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
171{
172 int cpu, die_id, s;
173
174 if (idx > map->nr)
175 return -1;
176
177 cpu = map->map[idx];
178
179 die_id = cpu_map__get_die_id(cpu);
180 /* There is no die_id on legacy system. */
181 if (die_id == -1)
182 die_id = 0;
183
184 s = cpu_map__get_socket(map, idx, data);
185 if (s == -1)
186 return -1;
187
188 /*
189 * Encode socket in bit range 15:8
190 * die_id is relative to socket, and
191 * we need a global id. So we combine
192 * socket + die id
193 */
194 if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
195 return -1;
196
197 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
198 return -1;
199
200 return (s << 8) | (die_id & 0xff);
201}
202
203int cpu_map__get_core_id(int cpu)
204{
205 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
206 return ret ?: value;
207}
208
209int cpu_map__get_node_id(int cpu)
210{
211 return cpu__get_node(cpu);
212}
213
214int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
215{
216 int cpu, s_die;
217
218 if (idx > map->nr)
219 return -1;
220
221 cpu = map->map[idx];
222
223 cpu = cpu_map__get_core_id(cpu);
224
225 /* s_die is the combination of socket + die id */
226 s_die = cpu_map__get_die(map, idx, data);
227 if (s_die == -1)
228 return -1;
229
230 /*
231 * encode socket in bit range 31:24
232 * encode die id in bit range 23:16
233 * core_id is relative to socket and die,
234 * we need a global id. So we combine
235 * socket + die id + core id
236 */
237 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
238 return -1;
239
240 return (s_die << 16) | (cpu & 0xffff);
241}
242
243int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
244{
245 if (idx < 0 || idx >= map->nr)
246 return -1;
247
248 return cpu_map__get_node_id(map->map[idx]);
249}
250
251int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
252{
253 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
254}
255
256int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
257{
258 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
259}
260
261int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
262{
263 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
264}
265
266int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap)
267{
268 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
269}
270
271/* setup simple routines to easily access node numbers given a cpu number */
272static int get_max_num(char *path, int *max)
273{
274 size_t num;
275 char *buf;
276 int err = 0;
277
278 if (filename__read_str(path, &buf, &num))
279 return -1;
280
281 buf[num] = '\0';
282
283 /* start on the right, to find highest node num */
284 while (--num) {
285 if ((buf[num] == ',') || (buf[num] == '-')) {
286 num++;
287 break;
288 }
289 }
290 if (sscanf(&buf[num], "%d", max) < 1) {
291 err = -1;
292 goto out;
293 }
294
295 /* convert from 0-based to 1-based */
296 (*max)++;
297
298out:
299 free(buf);
300 return err;
301}
302
303/* Determine highest possible cpu in the system for sparse allocation */
304static void set_max_cpu_num(void)
305{
306 const char *mnt;
307 char path[PATH_MAX];
308 int ret = -1;
309
310 /* set up default */
311 max_cpu_num = 4096;
312 max_present_cpu_num = 4096;
313
314 mnt = sysfs__mountpoint();
315 if (!mnt)
316 goto out;
317
318 /* get the highest possible cpu number for a sparse allocation */
319 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
320 if (ret >= PATH_MAX) {
321 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
322 goto out;
323 }
324
325 ret = get_max_num(path, &max_cpu_num);
326 if (ret)
327 goto out;
328
329 /* get the highest present cpu number for a sparse allocation */
330 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
331 if (ret >= PATH_MAX) {
332 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
333 goto out;
334 }
335
336 ret = get_max_num(path, &max_present_cpu_num);
337
338out:
339 if (ret)
340 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
341}
342
343/* Determine highest possible node in the system for sparse allocation */
344static void set_max_node_num(void)
345{
346 const char *mnt;
347 char path[PATH_MAX];
348 int ret = -1;
349
350 /* set up default */
351 max_node_num = 8;
352
353 mnt = sysfs__mountpoint();
354 if (!mnt)
355 goto out;
356
357 /* get the highest possible cpu number for a sparse allocation */
358 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
359 if (ret >= PATH_MAX) {
360 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
361 goto out;
362 }
363
364 ret = get_max_num(path, &max_node_num);
365
366out:
367 if (ret)
368 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
369}
370
371int cpu__max_node(void)
372{
373 if (unlikely(!max_node_num))
374 set_max_node_num();
375
376 return max_node_num;
377}
378
379int cpu__max_cpu(void)
380{
381 if (unlikely(!max_cpu_num))
382 set_max_cpu_num();
383
384 return max_cpu_num;
385}
386
387int cpu__max_present_cpu(void)
388{
389 if (unlikely(!max_present_cpu_num))
390 set_max_cpu_num();
391
392 return max_present_cpu_num;
393}
394
395
396int cpu__get_node(int cpu)
397{
398 if (unlikely(cpunode_map == NULL)) {
399 pr_debug("cpu_map not initialized\n");
400 return -1;
401 }
402
403 return cpunode_map[cpu];
404}
405
406static int init_cpunode_map(void)
407{
408 int i;
409
410 set_max_cpu_num();
411 set_max_node_num();
412
413 cpunode_map = calloc(max_cpu_num, sizeof(int));
414 if (!cpunode_map) {
415 pr_err("%s: calloc failed\n", __func__);
416 return -1;
417 }
418
419 for (i = 0; i < max_cpu_num; i++)
420 cpunode_map[i] = -1;
421
422 return 0;
423}
424
425int cpu__setup_cpunode_map(void)
426{
427 struct dirent *dent1, *dent2;
428 DIR *dir1, *dir2;
429 unsigned int cpu, mem;
430 char buf[PATH_MAX];
431 char path[PATH_MAX];
432 const char *mnt;
433 int n;
434
435 /* initialize globals */
436 if (init_cpunode_map())
437 return -1;
438
439 mnt = sysfs__mountpoint();
440 if (!mnt)
441 return 0;
442
443 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
444 if (n >= PATH_MAX) {
445 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
446 return -1;
447 }
448
449 dir1 = opendir(path);
450 if (!dir1)
451 return 0;
452
453 /* walk tree and setup map */
454 while ((dent1 = readdir(dir1)) != NULL) {
455 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
456 continue;
457
458 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
459 if (n >= PATH_MAX) {
460 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
461 continue;
462 }
463
464 dir2 = opendir(buf);
465 if (!dir2)
466 continue;
467 while ((dent2 = readdir(dir2)) != NULL) {
468 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
469 continue;
470 cpunode_map[cpu] = mem;
471 }
472 closedir(dir2);
473 }
474 closedir(dir1);
475 return 0;
476}
477
478bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
479{
480 return perf_cpu_map__idx(cpus, cpu) != -1;
481}
482
483int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
484{
485 return cpus->map[idx];
486}
487
488size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
489{
490 int i, cpu, start = -1;
491 bool first = true;
492 size_t ret = 0;
493
494#define COMMA first ? "" : ","
495
496 for (i = 0; i < map->nr + 1; i++) {
497 bool last = i == map->nr;
498
499 cpu = last ? INT_MAX : map->map[i];
500
501 if (start == -1) {
502 start = i;
503 if (last) {
504 ret += snprintf(buf + ret, size - ret,
505 "%s%d", COMMA,
506 map->map[i]);
507 }
508 } else if (((i - start) != (cpu - map->map[start])) || last) {
509 int end = i - 1;
510
511 if (start == end) {
512 ret += snprintf(buf + ret, size - ret,
513 "%s%d", COMMA,
514 map->map[start]);
515 } else {
516 ret += snprintf(buf + ret, size - ret,
517 "%s%d-%d", COMMA,
518 map->map[start], map->map[end]);
519 }
520 first = false;
521 start = i;
522 }
523 }
524
525#undef COMMA
526
527 pr_debug2("cpumask list: %s\n", buf);
528 return ret;
529}
530
531static char hex_char(unsigned char val)
532{
533 if (val < 10)
534 return val + '0';
535 if (val < 16)
536 return val - 10 + 'a';
537 return '?';
538}
539
540size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
541{
542 int i, cpu;
543 char *ptr = buf;
544 unsigned char *bitmap;
545 int last_cpu = cpu_map__cpu(map, map->nr - 1);
546
547 if (buf == NULL)
548 return 0;
549
550 bitmap = zalloc(last_cpu / 8 + 1);
551 if (bitmap == NULL) {
552 buf[0] = '\0';
553 return 0;
554 }
555
556 for (i = 0; i < map->nr; i++) {
557 cpu = cpu_map__cpu(map, i);
558 bitmap[cpu / 8] |= 1 << (cpu % 8);
559 }
560
561 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
562 unsigned char bits = bitmap[cpu / 8];
563
564 if (cpu % 8)
565 bits >>= 4;
566 else
567 bits &= 0xf;
568
569 *ptr++ = hex_char(bits);
570 if ((cpu % 32) == 0 && cpu > 0)
571 *ptr++ = ',';
572 }
573 *ptr = '\0';
574 free(bitmap);
575
576 buf[size - 1] = '\0';
577 return ptr - buf;
578}
579
580const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
581{
582 static const struct perf_cpu_map *online = NULL;
583
584 if (!online)
585 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
586
587 return online;
588}