1
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
32
33
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
98struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr)
99{
100 struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr);
101
102 if (cpus != NULL) {
103 int i;
104
105 cpus->nr = nr;
106 for (i = 0; i < nr; i++)
107 cpus->map[i] = cpu_map__empty_aggr_cpu_id();
108
109 refcount_set(&cpus->refcnt, 1);
110 }
111
112 return cpus;
113}
114
115static int cpu__get_topology_int(int cpu, const char *name, int *value)
116{
117 char path[PATH_MAX];
118
119 snprintf(path, PATH_MAX,
120 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
121
122 return sysfs__read_int(path, value);
123}
124
125int cpu_map__get_socket_id(int cpu)
126{
127 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
128 return ret ?: value;
129}
130
131struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx,
132 void *data __maybe_unused)
133{
134 int cpu;
135 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
136
137 if (idx > map->nr)
138 return id;
139
140 cpu = map->map[idx];
141
142 id.socket = cpu_map__get_socket_id(cpu);
143 return id;
144}
145
146static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
147{
148 struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
149 struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
150
151 if (a->node != b->node)
152 return a->node - b->node;
153 else if (a->socket != b->socket)
154 return a->socket - b->socket;
155 else if (a->die != b->die)
156 return a->die - b->die;
157 else if (a->core != b->core)
158 return a->core - b->core;
159 else
160 return a->thread - b->thread;
161}
162
163int cpu_map__build_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **res,
164 struct aggr_cpu_id (*f)(struct perf_cpu_map *map, int cpu, void *data),
165 void *data)
166{
167 int nr = cpus->nr;
168 struct cpu_aggr_map *c = cpu_aggr_map__empty_new(nr);
169 int cpu, s2;
170 struct aggr_cpu_id s1;
171
172 if (!c)
173 return -1;
174
175
176 c->nr = 0;
177
178 for (cpu = 0; cpu < nr; cpu++) {
179 s1 = f(cpus, cpu, data);
180 for (s2 = 0; s2 < c->nr; s2++) {
181 if (cpu_map__compare_aggr_cpu_id(s1, c->map[s2]))
182 break;
183 }
184 if (s2 == c->nr) {
185 c->map[c->nr] = s1;
186 c->nr++;
187 }
188 }
189
190 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), cmp_aggr_cpu_id);
191
192 *res = c;
193 return 0;
194}
195
196int cpu_map__get_die_id(int cpu)
197{
198 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
199
200 return ret ?: value;
201}
202
203struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
204{
205 int cpu, die;
206 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
207
208 if (idx > map->nr)
209 return id;
210
211 cpu = map->map[idx];
212
213 die = cpu_map__get_die_id(cpu);
214
215 if (die == -1)
216 die = 0;
217
218
219
220
221
222
223 id = cpu_map__get_socket(map, idx, data);
224 if (cpu_map__aggr_cpu_id_is_empty(id))
225 return id;
226
227 id.die = die;
228 return id;
229}
230
231int cpu_map__get_core_id(int cpu)
232{
233 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
234 return ret ?: value;
235}
236
237int cpu_map__get_node_id(int cpu)
238{
239 return cpu__get_node(cpu);
240}
241
242struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
243{
244 int cpu;
245 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
246
247 if (idx > map->nr)
248 return id;
249
250 cpu = map->map[idx];
251
252 cpu = cpu_map__get_core_id(cpu);
253
254
255 id = cpu_map__get_die(map, idx, data);
256 if (cpu_map__aggr_cpu_id_is_empty(id))
257 return id;
258
259
260
261
262
263 id.core = cpu;
264 return id;
265}
266
267struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
268{
269 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
270
271 if (idx < 0 || idx >= map->nr)
272 return id;
273
274 id.node = cpu_map__get_node_id(map->map[idx]);
275 return id;
276}
277
278int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **sockp)
279{
280 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
281}
282
283int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **diep)
284{
285 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
286}
287
288int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **corep)
289{
290 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
291}
292
293int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **numap)
294{
295 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
296}
297
298
299static int get_max_num(char *path, int *max)
300{
301 size_t num;
302 char *buf;
303 int err = 0;
304
305 if (filename__read_str(path, &buf, &num))
306 return -1;
307
308 buf[num] = '\0';
309
310
311 while (--num) {
312 if ((buf[num] == ',') || (buf[num] == '-')) {
313 num++;
314 break;
315 }
316 }
317 if (sscanf(&buf[num], "%d", max) < 1) {
318 err = -1;
319 goto out;
320 }
321
322
323 (*max)++;
324
325out:
326 free(buf);
327 return err;
328}
329
330
331static void set_max_cpu_num(void)
332{
333 const char *mnt;
334 char path[PATH_MAX];
335 int ret = -1;
336
337
338 max_cpu_num = 4096;
339 max_present_cpu_num = 4096;
340
341 mnt = sysfs__mountpoint();
342 if (!mnt)
343 goto out;
344
345
346 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
347 if (ret >= PATH_MAX) {
348 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
349 goto out;
350 }
351
352 ret = get_max_num(path, &max_cpu_num);
353 if (ret)
354 goto out;
355
356
357 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
358 if (ret >= PATH_MAX) {
359 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
360 goto out;
361 }
362
363 ret = get_max_num(path, &max_present_cpu_num);
364
365out:
366 if (ret)
367 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
368}
369
370
371static void set_max_node_num(void)
372{
373 const char *mnt;
374 char path[PATH_MAX];
375 int ret = -1;
376
377
378 max_node_num = 8;
379
380 mnt = sysfs__mountpoint();
381 if (!mnt)
382 goto out;
383
384
385 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
386 if (ret >= PATH_MAX) {
387 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
388 goto out;
389 }
390
391 ret = get_max_num(path, &max_node_num);
392
393out:
394 if (ret)
395 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
396}
397
398int cpu__max_node(void)
399{
400 if (unlikely(!max_node_num))
401 set_max_node_num();
402
403 return max_node_num;
404}
405
406int cpu__max_cpu(void)
407{
408 if (unlikely(!max_cpu_num))
409 set_max_cpu_num();
410
411 return max_cpu_num;
412}
413
414int cpu__max_present_cpu(void)
415{
416 if (unlikely(!max_present_cpu_num))
417 set_max_cpu_num();
418
419 return max_present_cpu_num;
420}
421
422
423int cpu__get_node(int cpu)
424{
425 if (unlikely(cpunode_map == NULL)) {
426 pr_debug("cpu_map not initialized\n");
427 return -1;
428 }
429
430 return cpunode_map[cpu];
431}
432
433static int init_cpunode_map(void)
434{
435 int i;
436
437 set_max_cpu_num();
438 set_max_node_num();
439
440 cpunode_map = calloc(max_cpu_num, sizeof(int));
441 if (!cpunode_map) {
442 pr_err("%s: calloc failed\n", __func__);
443 return -1;
444 }
445
446 for (i = 0; i < max_cpu_num; i++)
447 cpunode_map[i] = -1;
448
449 return 0;
450}
451
452int cpu__setup_cpunode_map(void)
453{
454 struct dirent *dent1, *dent2;
455 DIR *dir1, *dir2;
456 unsigned int cpu, mem;
457 char buf[PATH_MAX];
458 char path[PATH_MAX];
459 const char *mnt;
460 int n;
461
462
463 if (init_cpunode_map())
464 return -1;
465
466 mnt = sysfs__mountpoint();
467 if (!mnt)
468 return 0;
469
470 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
471 if (n >= PATH_MAX) {
472 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
473 return -1;
474 }
475
476 dir1 = opendir(path);
477 if (!dir1)
478 return 0;
479
480
481 while ((dent1 = readdir(dir1)) != NULL) {
482 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
483 continue;
484
485 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
486 if (n >= PATH_MAX) {
487 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
488 continue;
489 }
490
491 dir2 = opendir(buf);
492 if (!dir2)
493 continue;
494 while ((dent2 = readdir(dir2)) != NULL) {
495 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
496 continue;
497 cpunode_map[cpu] = mem;
498 }
499 closedir(dir2);
500 }
501 closedir(dir1);
502 return 0;
503}
504
505bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
506{
507 return perf_cpu_map__idx(cpus, cpu) != -1;
508}
509
510int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
511{
512 return cpus->map[idx];
513}
514
515size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
516{
517 int i, cpu, start = -1;
518 bool first = true;
519 size_t ret = 0;
520
521#define COMMA first ? "" : ","
522
523 for (i = 0; i < map->nr + 1; i++) {
524 bool last = i == map->nr;
525
526 cpu = last ? INT_MAX : map->map[i];
527
528 if (start == -1) {
529 start = i;
530 if (last) {
531 ret += snprintf(buf + ret, size - ret,
532 "%s%d", COMMA,
533 map->map[i]);
534 }
535 } else if (((i - start) != (cpu - map->map[start])) || last) {
536 int end = i - 1;
537
538 if (start == end) {
539 ret += snprintf(buf + ret, size - ret,
540 "%s%d", COMMA,
541 map->map[start]);
542 } else {
543 ret += snprintf(buf + ret, size - ret,
544 "%s%d-%d", COMMA,
545 map->map[start], map->map[end]);
546 }
547 first = false;
548 start = i;
549 }
550 }
551
552#undef COMMA
553
554 pr_debug2("cpumask list: %s\n", buf);
555 return ret;
556}
557
558static char hex_char(unsigned char val)
559{
560 if (val < 10)
561 return val + '0';
562 if (val < 16)
563 return val - 10 + 'a';
564 return '?';
565}
566
567size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
568{
569 int i, cpu;
570 char *ptr = buf;
571 unsigned char *bitmap;
572 int last_cpu = cpu_map__cpu(map, map->nr - 1);
573
574 if (buf == NULL)
575 return 0;
576
577 bitmap = zalloc(last_cpu / 8 + 1);
578 if (bitmap == NULL) {
579 buf[0] = '\0';
580 return 0;
581 }
582
583 for (i = 0; i < map->nr; i++) {
584 cpu = cpu_map__cpu(map, i);
585 bitmap[cpu / 8] |= 1 << (cpu % 8);
586 }
587
588 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
589 unsigned char bits = bitmap[cpu / 8];
590
591 if (cpu % 8)
592 bits >>= 4;
593 else
594 bits &= 0xf;
595
596 *ptr++ = hex_char(bits);
597 if ((cpu % 32) == 0 && cpu > 0)
598 *ptr++ = ',';
599 }
600 *ptr = '\0';
601 free(bitmap);
602
603 buf[size - 1] = '\0';
604 return ptr - buf;
605}
606
607const struct perf_cpu_map *cpu_map__online(void)
608{
609 static const struct perf_cpu_map *online = NULL;
610
611 if (!online)
612 online = perf_cpu_map__new(NULL);
613
614 return online;
615}
616
617bool cpu_map__compare_aggr_cpu_id(struct aggr_cpu_id a, struct aggr_cpu_id b)
618{
619 return a.thread == b.thread &&
620 a.node == b.node &&
621 a.socket == b.socket &&
622 a.die == b.die &&
623 a.core == b.core;
624}
625
626bool cpu_map__aggr_cpu_id_is_empty(struct aggr_cpu_id a)
627{
628 return a.thread == -1 &&
629 a.node == -1 &&
630 a.socket == -1 &&
631 a.die == -1 &&
632 a.core == -1;
633}
634
635struct aggr_cpu_id cpu_map__empty_aggr_cpu_id(void)
636{
637 struct aggr_cpu_id ret = {
638 .thread = -1,
639 .node = -1,
640 .socket = -1,
641 .die = -1,
642 .core = -1
643 };
644 return ret;
645}
646