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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#include <internal/cpumap.h>
16
17static struct perf_cpu max_cpu_num;
18static struct perf_cpu max_present_cpu_num;
19static int max_node_num;
20/**
21 * The numa node X as read from /sys/devices/system/node/nodeX indexed by the
22 * CPU number.
23 */
24static int *cpunode_map;
25
26bool perf_record_cpu_map_data__test_bit(int i,
27 const struct perf_record_cpu_map_data *data)
28{
29 int bit_word32 = i / 32;
30 __u32 bit_mask32 = 1U << (i & 31);
31 int bit_word64 = i / 64;
32 __u64 bit_mask64 = ((__u64)1) << (i & 63);
33
34 return (data->mask32_data.long_size == 4)
35 ? (bit_word32 < data->mask32_data.nr) &&
36 (data->mask32_data.mask[bit_word32] & bit_mask32) != 0
37 : (bit_word64 < data->mask64_data.nr) &&
38 (data->mask64_data.mask[bit_word64] & bit_mask64) != 0;
39}
40
41/* Read ith mask value from data into the given 64-bit sized bitmap */
42static void perf_record_cpu_map_data__read_one_mask(const struct perf_record_cpu_map_data *data,
43 int i, unsigned long *bitmap)
44{
45#if __SIZEOF_LONG__ == 8
46 if (data->mask32_data.long_size == 4)
47 bitmap[0] = data->mask32_data.mask[i];
48 else
49 bitmap[0] = data->mask64_data.mask[i];
50#else
51 if (data->mask32_data.long_size == 4) {
52 bitmap[0] = data->mask32_data.mask[i];
53 bitmap[1] = 0;
54 } else {
55#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
56 bitmap[0] = (unsigned long)(data->mask64_data.mask[i] >> 32);
57 bitmap[1] = (unsigned long)data->mask64_data.mask[i];
58#else
59 bitmap[0] = (unsigned long)data->mask64_data.mask[i];
60 bitmap[1] = (unsigned long)(data->mask64_data.mask[i] >> 32);
61#endif
62 }
63#endif
64}
65static struct perf_cpu_map *cpu_map__from_entries(const struct perf_record_cpu_map_data *data)
66{
67 struct perf_cpu_map *map;
68
69 map = perf_cpu_map__empty_new(data->cpus_data.nr);
70 if (map) {
71 unsigned i;
72
73 for (i = 0; i < data->cpus_data.nr; i++) {
74 /*
75 * Special treatment for -1, which is not real cpu number,
76 * and we need to use (int) -1 to initialize map[i],
77 * otherwise it would become 65535.
78 */
79 if (data->cpus_data.cpu[i] == (u16) -1)
80 RC_CHK_ACCESS(map)->map[i].cpu = -1;
81 else
82 RC_CHK_ACCESS(map)->map[i].cpu = (int) data->cpus_data.cpu[i];
83 }
84 }
85
86 return map;
87}
88
89static struct perf_cpu_map *cpu_map__from_mask(const struct perf_record_cpu_map_data *data)
90{
91 DECLARE_BITMAP(local_copy, 64);
92 int weight = 0, mask_nr = data->mask32_data.nr;
93 struct perf_cpu_map *map;
94
95 for (int i = 0; i < mask_nr; i++) {
96 perf_record_cpu_map_data__read_one_mask(data, i, local_copy);
97 weight += bitmap_weight(local_copy, 64);
98 }
99
100 map = perf_cpu_map__empty_new(weight);
101 if (!map)
102 return NULL;
103
104 for (int i = 0, j = 0; i < mask_nr; i++) {
105 int cpus_per_i = (i * data->mask32_data.long_size * BITS_PER_BYTE);
106 int cpu;
107
108 perf_record_cpu_map_data__read_one_mask(data, i, local_copy);
109 for_each_set_bit(cpu, local_copy, 64)
110 RC_CHK_ACCESS(map)->map[j++].cpu = cpu + cpus_per_i;
111 }
112 return map;
113
114}
115
116static struct perf_cpu_map *cpu_map__from_range(const struct perf_record_cpu_map_data *data)
117{
118 struct perf_cpu_map *map;
119 unsigned int i = 0;
120
121 map = perf_cpu_map__empty_new(data->range_cpu_data.end_cpu -
122 data->range_cpu_data.start_cpu + 1 + data->range_cpu_data.any_cpu);
123 if (!map)
124 return NULL;
125
126 if (data->range_cpu_data.any_cpu)
127 RC_CHK_ACCESS(map)->map[i++].cpu = -1;
128
129 for (int cpu = data->range_cpu_data.start_cpu; cpu <= data->range_cpu_data.end_cpu;
130 i++, cpu++)
131 RC_CHK_ACCESS(map)->map[i].cpu = cpu;
132
133 return map;
134}
135
136struct perf_cpu_map *cpu_map__new_data(const struct perf_record_cpu_map_data *data)
137{
138 switch (data->type) {
139 case PERF_CPU_MAP__CPUS:
140 return cpu_map__from_entries(data);
141 case PERF_CPU_MAP__MASK:
142 return cpu_map__from_mask(data);
143 case PERF_CPU_MAP__RANGE_CPUS:
144 return cpu_map__from_range(data);
145 default:
146 pr_err("cpu_map__new_data unknown type %d\n", data->type);
147 return NULL;
148 }
149}
150
151size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
152{
153#define BUFSIZE 1024
154 char buf[BUFSIZE];
155
156 cpu_map__snprint(map, buf, sizeof(buf));
157 return fprintf(fp, "%s\n", buf);
158#undef BUFSIZE
159}
160
161struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
162{
163 struct perf_cpu_map *cpus = perf_cpu_map__alloc(nr);
164
165 if (cpus != NULL) {
166 for (int i = 0; i < nr; i++)
167 RC_CHK_ACCESS(cpus)->map[i].cpu = -1;
168 }
169
170 return cpus;
171}
172
173struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr)
174{
175 struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr);
176
177 if (cpus != NULL) {
178 int i;
179
180 cpus->nr = nr;
181 for (i = 0; i < nr; i++)
182 cpus->map[i] = aggr_cpu_id__empty();
183
184 refcount_set(&cpus->refcnt, 1);
185 }
186
187 return cpus;
188}
189
190static int cpu__get_topology_int(int cpu, const char *name, int *value)
191{
192 char path[PATH_MAX];
193
194 snprintf(path, PATH_MAX,
195 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
196
197 return sysfs__read_int(path, value);
198}
199
200int cpu__get_socket_id(struct perf_cpu cpu)
201{
202 int value, ret = cpu__get_topology_int(cpu.cpu, "physical_package_id", &value);
203 return ret ?: value;
204}
205
206struct aggr_cpu_id aggr_cpu_id__socket(struct perf_cpu cpu, void *data __maybe_unused)
207{
208 struct aggr_cpu_id id = aggr_cpu_id__empty();
209
210 id.socket = cpu__get_socket_id(cpu);
211 return id;
212}
213
214static int aggr_cpu_id__cmp(const void *a_pointer, const void *b_pointer)
215{
216 struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
217 struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
218
219 if (a->node != b->node)
220 return a->node - b->node;
221 else if (a->socket != b->socket)
222 return a->socket - b->socket;
223 else if (a->die != b->die)
224 return a->die - b->die;
225 else if (a->cache_lvl != b->cache_lvl)
226 return a->cache_lvl - b->cache_lvl;
227 else if (a->cache != b->cache)
228 return a->cache - b->cache;
229 else if (a->core != b->core)
230 return a->core - b->core;
231 else
232 return a->thread_idx - b->thread_idx;
233}
234
235struct cpu_aggr_map *cpu_aggr_map__new(const struct perf_cpu_map *cpus,
236 aggr_cpu_id_get_t get_id,
237 void *data, bool needs_sort)
238{
239 int idx;
240 struct perf_cpu cpu;
241 struct cpu_aggr_map *c = cpu_aggr_map__empty_new(perf_cpu_map__nr(cpus));
242
243 if (!c)
244 return NULL;
245
246 /* Reset size as it may only be partially filled */
247 c->nr = 0;
248
249 perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
250 bool duplicate = false;
251 struct aggr_cpu_id cpu_id = get_id(cpu, data);
252
253 for (int j = 0; j < c->nr; j++) {
254 if (aggr_cpu_id__equal(&cpu_id, &c->map[j])) {
255 duplicate = true;
256 break;
257 }
258 }
259 if (!duplicate) {
260 c->map[c->nr] = cpu_id;
261 c->nr++;
262 }
263 }
264 /* Trim. */
265 if (c->nr != perf_cpu_map__nr(cpus)) {
266 struct cpu_aggr_map *trimmed_c =
267 realloc(c,
268 sizeof(struct cpu_aggr_map) + sizeof(struct aggr_cpu_id) * c->nr);
269
270 if (trimmed_c)
271 c = trimmed_c;
272 }
273
274 /* ensure we process id in increasing order */
275 if (needs_sort)
276 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), aggr_cpu_id__cmp);
277
278 return c;
279
280}
281
282int cpu__get_die_id(struct perf_cpu cpu)
283{
284 int value, ret = cpu__get_topology_int(cpu.cpu, "die_id", &value);
285
286 return ret ?: value;
287}
288
289struct aggr_cpu_id aggr_cpu_id__die(struct perf_cpu cpu, void *data)
290{
291 struct aggr_cpu_id id;
292 int die;
293
294 die = cpu__get_die_id(cpu);
295 /* There is no die_id on legacy system. */
296 if (die == -1)
297 die = 0;
298
299 /*
300 * die_id is relative to socket, so start
301 * with the socket ID and then add die to
302 * make a unique ID.
303 */
304 id = aggr_cpu_id__socket(cpu, data);
305 if (aggr_cpu_id__is_empty(&id))
306 return id;
307
308 id.die = die;
309 return id;
310}
311
312int cpu__get_core_id(struct perf_cpu cpu)
313{
314 int value, ret = cpu__get_topology_int(cpu.cpu, "core_id", &value);
315 return ret ?: value;
316}
317
318struct aggr_cpu_id aggr_cpu_id__core(struct perf_cpu cpu, void *data)
319{
320 struct aggr_cpu_id id;
321 int core = cpu__get_core_id(cpu);
322
323 /* aggr_cpu_id__die returns a struct with socket and die set. */
324 id = aggr_cpu_id__die(cpu, data);
325 if (aggr_cpu_id__is_empty(&id))
326 return id;
327
328 /*
329 * core_id is relative to socket and die, we need a global id.
330 * So we combine the result from cpu_map__get_die with the core id
331 */
332 id.core = core;
333 return id;
334
335}
336
337struct aggr_cpu_id aggr_cpu_id__cpu(struct perf_cpu cpu, void *data)
338{
339 struct aggr_cpu_id id;
340
341 /* aggr_cpu_id__core returns a struct with socket, die and core set. */
342 id = aggr_cpu_id__core(cpu, data);
343 if (aggr_cpu_id__is_empty(&id))
344 return id;
345
346 id.cpu = cpu;
347 return id;
348
349}
350
351struct aggr_cpu_id aggr_cpu_id__node(struct perf_cpu cpu, void *data __maybe_unused)
352{
353 struct aggr_cpu_id id = aggr_cpu_id__empty();
354
355 id.node = cpu__get_node(cpu);
356 return id;
357}
358
359struct aggr_cpu_id aggr_cpu_id__global(struct perf_cpu cpu, void *data __maybe_unused)
360{
361 struct aggr_cpu_id id = aggr_cpu_id__empty();
362
363 /* it always aggregates to the cpu 0 */
364 cpu.cpu = 0;
365 id.cpu = cpu;
366 return id;
367}
368
369/* setup simple routines to easily access node numbers given a cpu number */
370static int get_max_num(char *path, int *max)
371{
372 size_t num;
373 char *buf;
374 int err = 0;
375
376 if (filename__read_str(path, &buf, &num))
377 return -1;
378
379 buf[num] = '\0';
380
381 /* start on the right, to find highest node num */
382 while (--num) {
383 if ((buf[num] == ',') || (buf[num] == '-')) {
384 num++;
385 break;
386 }
387 }
388 if (sscanf(&buf[num], "%d", max) < 1) {
389 err = -1;
390 goto out;
391 }
392
393 /* convert from 0-based to 1-based */
394 (*max)++;
395
396out:
397 free(buf);
398 return err;
399}
400
401/* Determine highest possible cpu in the system for sparse allocation */
402static void set_max_cpu_num(void)
403{
404 const char *mnt;
405 char path[PATH_MAX];
406 int ret = -1;
407
408 /* set up default */
409 max_cpu_num.cpu = 4096;
410 max_present_cpu_num.cpu = 4096;
411
412 mnt = sysfs__mountpoint();
413 if (!mnt)
414 goto out;
415
416 /* get the highest possible cpu number for a sparse allocation */
417 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
418 if (ret >= PATH_MAX) {
419 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
420 goto out;
421 }
422
423 ret = get_max_num(path, &max_cpu_num.cpu);
424 if (ret)
425 goto out;
426
427 /* get the highest present cpu number for a sparse allocation */
428 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
429 if (ret >= PATH_MAX) {
430 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
431 goto out;
432 }
433
434 ret = get_max_num(path, &max_present_cpu_num.cpu);
435
436out:
437 if (ret)
438 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num.cpu);
439}
440
441/* Determine highest possible node in the system for sparse allocation */
442static void set_max_node_num(void)
443{
444 const char *mnt;
445 char path[PATH_MAX];
446 int ret = -1;
447
448 /* set up default */
449 max_node_num = 8;
450
451 mnt = sysfs__mountpoint();
452 if (!mnt)
453 goto out;
454
455 /* get the highest possible cpu number for a sparse allocation */
456 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
457 if (ret >= PATH_MAX) {
458 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
459 goto out;
460 }
461
462 ret = get_max_num(path, &max_node_num);
463
464out:
465 if (ret)
466 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
467}
468
469int cpu__max_node(void)
470{
471 if (unlikely(!max_node_num))
472 set_max_node_num();
473
474 return max_node_num;
475}
476
477struct perf_cpu cpu__max_cpu(void)
478{
479 if (unlikely(!max_cpu_num.cpu))
480 set_max_cpu_num();
481
482 return max_cpu_num;
483}
484
485struct perf_cpu cpu__max_present_cpu(void)
486{
487 if (unlikely(!max_present_cpu_num.cpu))
488 set_max_cpu_num();
489
490 return max_present_cpu_num;
491}
492
493
494int cpu__get_node(struct perf_cpu cpu)
495{
496 if (unlikely(cpunode_map == NULL)) {
497 pr_debug("cpu_map not initialized\n");
498 return -1;
499 }
500
501 return cpunode_map[cpu.cpu];
502}
503
504static int init_cpunode_map(void)
505{
506 int i;
507
508 set_max_cpu_num();
509 set_max_node_num();
510
511 cpunode_map = calloc(max_cpu_num.cpu, sizeof(int));
512 if (!cpunode_map) {
513 pr_err("%s: calloc failed\n", __func__);
514 return -1;
515 }
516
517 for (i = 0; i < max_cpu_num.cpu; i++)
518 cpunode_map[i] = -1;
519
520 return 0;
521}
522
523int cpu__setup_cpunode_map(void)
524{
525 struct dirent *dent1, *dent2;
526 DIR *dir1, *dir2;
527 unsigned int cpu, mem;
528 char buf[PATH_MAX];
529 char path[PATH_MAX];
530 const char *mnt;
531 int n;
532
533 /* initialize globals */
534 if (init_cpunode_map())
535 return -1;
536
537 mnt = sysfs__mountpoint();
538 if (!mnt)
539 return 0;
540
541 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
542 if (n >= PATH_MAX) {
543 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
544 return -1;
545 }
546
547 dir1 = opendir(path);
548 if (!dir1)
549 return 0;
550
551 /* walk tree and setup map */
552 while ((dent1 = readdir(dir1)) != NULL) {
553 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
554 continue;
555
556 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
557 if (n >= PATH_MAX) {
558 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
559 continue;
560 }
561
562 dir2 = opendir(buf);
563 if (!dir2)
564 continue;
565 while ((dent2 = readdir(dir2)) != NULL) {
566 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
567 continue;
568 cpunode_map[cpu] = mem;
569 }
570 closedir(dir2);
571 }
572 closedir(dir1);
573 return 0;
574}
575
576size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
577{
578 int i, start = -1;
579 bool first = true;
580 size_t ret = 0;
581
582#define COMMA first ? "" : ","
583
584 for (i = 0; i < perf_cpu_map__nr(map) + 1; i++) {
585 struct perf_cpu cpu = { .cpu = INT_MAX };
586 bool last = i == perf_cpu_map__nr(map);
587
588 if (!last)
589 cpu = perf_cpu_map__cpu(map, i);
590
591 if (start == -1) {
592 start = i;
593 if (last) {
594 ret += snprintf(buf + ret, size - ret,
595 "%s%d", COMMA,
596 perf_cpu_map__cpu(map, i).cpu);
597 }
598 } else if (((i - start) != (cpu.cpu - perf_cpu_map__cpu(map, start).cpu)) || last) {
599 int end = i - 1;
600
601 if (start == end) {
602 ret += snprintf(buf + ret, size - ret,
603 "%s%d", COMMA,
604 perf_cpu_map__cpu(map, start).cpu);
605 } else {
606 ret += snprintf(buf + ret, size - ret,
607 "%s%d-%d", COMMA,
608 perf_cpu_map__cpu(map, start).cpu, perf_cpu_map__cpu(map, end).cpu);
609 }
610 first = false;
611 start = i;
612 }
613 }
614
615#undef COMMA
616
617 pr_debug2("cpumask list: %s\n", buf);
618 return ret;
619}
620
621static char hex_char(unsigned char val)
622{
623 if (val < 10)
624 return val + '0';
625 if (val < 16)
626 return val - 10 + 'a';
627 return '?';
628}
629
630size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
631{
632 int i, cpu;
633 char *ptr = buf;
634 unsigned char *bitmap;
635 struct perf_cpu last_cpu = perf_cpu_map__cpu(map, perf_cpu_map__nr(map) - 1);
636
637 if (buf == NULL)
638 return 0;
639
640 bitmap = zalloc(last_cpu.cpu / 8 + 1);
641 if (bitmap == NULL) {
642 buf[0] = '\0';
643 return 0;
644 }
645
646 for (i = 0; i < perf_cpu_map__nr(map); i++) {
647 cpu = perf_cpu_map__cpu(map, i).cpu;
648 bitmap[cpu / 8] |= 1 << (cpu % 8);
649 }
650
651 for (cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {
652 unsigned char bits = bitmap[cpu / 8];
653
654 if (cpu % 8)
655 bits >>= 4;
656 else
657 bits &= 0xf;
658
659 *ptr++ = hex_char(bits);
660 if ((cpu % 32) == 0 && cpu > 0)
661 *ptr++ = ',';
662 }
663 *ptr = '\0';
664 free(bitmap);
665
666 buf[size - 1] = '\0';
667 return ptr - buf;
668}
669
670struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
671{
672 static struct perf_cpu_map *online;
673
674 if (!online)
675 online = perf_cpu_map__new_online_cpus(); /* from /sys/devices/system/cpu/online */
676
677 return online;
678}
679
680bool aggr_cpu_id__equal(const struct aggr_cpu_id *a, const struct aggr_cpu_id *b)
681{
682 return a->thread_idx == b->thread_idx &&
683 a->node == b->node &&
684 a->socket == b->socket &&
685 a->die == b->die &&
686 a->cache_lvl == b->cache_lvl &&
687 a->cache == b->cache &&
688 a->core == b->core &&
689 a->cpu.cpu == b->cpu.cpu;
690}
691
692bool aggr_cpu_id__is_empty(const struct aggr_cpu_id *a)
693{
694 return a->thread_idx == -1 &&
695 a->node == -1 &&
696 a->socket == -1 &&
697 a->die == -1 &&
698 a->cache_lvl == -1 &&
699 a->cache == -1 &&
700 a->core == -1 &&
701 a->cpu.cpu == -1;
702}
703
704struct aggr_cpu_id aggr_cpu_id__empty(void)
705{
706 struct aggr_cpu_id ret = {
707 .thread_idx = -1,
708 .node = -1,
709 .socket = -1,
710 .die = -1,
711 .cache_lvl = -1,
712 .cache = -1,
713 .core = -1,
714 .cpu = (struct perf_cpu){ .cpu = -1 },
715 };
716 return ret;
717}
1#include "util.h"
2#include <api/fs/fs.h>
3#include "../perf.h"
4#include "cpumap.h"
5#include <assert.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <linux/bitmap.h>
9#include "asm/bug.h"
10
11static int max_cpu_num;
12static int max_node_num;
13static int *cpunode_map;
14
15static struct cpu_map *cpu_map__default_new(void)
16{
17 struct cpu_map *cpus;
18 int nr_cpus;
19
20 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
21 if (nr_cpus < 0)
22 return NULL;
23
24 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
25 if (cpus != NULL) {
26 int i;
27 for (i = 0; i < nr_cpus; ++i)
28 cpus->map[i] = i;
29
30 cpus->nr = nr_cpus;
31 atomic_set(&cpus->refcnt, 1);
32 }
33
34 return cpus;
35}
36
37static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
38{
39 size_t payload_size = nr_cpus * sizeof(int);
40 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
41
42 if (cpus != NULL) {
43 cpus->nr = nr_cpus;
44 memcpy(cpus->map, tmp_cpus, payload_size);
45 atomic_set(&cpus->refcnt, 1);
46 }
47
48 return cpus;
49}
50
51struct cpu_map *cpu_map__read(FILE *file)
52{
53 struct cpu_map *cpus = NULL;
54 int nr_cpus = 0;
55 int *tmp_cpus = NULL, *tmp;
56 int max_entries = 0;
57 int n, cpu, prev;
58 char sep;
59
60 sep = 0;
61 prev = -1;
62 for (;;) {
63 n = fscanf(file, "%u%c", &cpu, &sep);
64 if (n <= 0)
65 break;
66 if (prev >= 0) {
67 int new_max = nr_cpus + cpu - prev - 1;
68
69 if (new_max >= max_entries) {
70 max_entries = new_max + MAX_NR_CPUS / 2;
71 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
72 if (tmp == NULL)
73 goto out_free_tmp;
74 tmp_cpus = tmp;
75 }
76
77 while (++prev < cpu)
78 tmp_cpus[nr_cpus++] = prev;
79 }
80 if (nr_cpus == max_entries) {
81 max_entries += MAX_NR_CPUS;
82 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
83 if (tmp == NULL)
84 goto out_free_tmp;
85 tmp_cpus = tmp;
86 }
87
88 tmp_cpus[nr_cpus++] = cpu;
89 if (n == 2 && sep == '-')
90 prev = cpu;
91 else
92 prev = -1;
93 if (n == 1 || sep == '\n')
94 break;
95 }
96
97 if (nr_cpus > 0)
98 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
99 else
100 cpus = cpu_map__default_new();
101out_free_tmp:
102 free(tmp_cpus);
103 return cpus;
104}
105
106static struct cpu_map *cpu_map__read_all_cpu_map(void)
107{
108 struct cpu_map *cpus = NULL;
109 FILE *onlnf;
110
111 onlnf = fopen("/sys/devices/system/cpu/online", "r");
112 if (!onlnf)
113 return cpu_map__default_new();
114
115 cpus = cpu_map__read(onlnf);
116 fclose(onlnf);
117 return cpus;
118}
119
120struct cpu_map *cpu_map__new(const char *cpu_list)
121{
122 struct cpu_map *cpus = NULL;
123 unsigned long start_cpu, end_cpu = 0;
124 char *p = NULL;
125 int i, nr_cpus = 0;
126 int *tmp_cpus = NULL, *tmp;
127 int max_entries = 0;
128
129 if (!cpu_list)
130 return cpu_map__read_all_cpu_map();
131
132 if (!isdigit(*cpu_list))
133 goto out;
134
135 while (isdigit(*cpu_list)) {
136 p = NULL;
137 start_cpu = strtoul(cpu_list, &p, 0);
138 if (start_cpu >= INT_MAX
139 || (*p != '\0' && *p != ',' && *p != '-'))
140 goto invalid;
141
142 if (*p == '-') {
143 cpu_list = ++p;
144 p = NULL;
145 end_cpu = strtoul(cpu_list, &p, 0);
146
147 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
148 goto invalid;
149
150 if (end_cpu < start_cpu)
151 goto invalid;
152 } else {
153 end_cpu = start_cpu;
154 }
155
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)
160 goto invalid;
161
162 if (nr_cpus == max_entries) {
163 max_entries += MAX_NR_CPUS;
164 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
165 if (tmp == NULL)
166 goto invalid;
167 tmp_cpus = tmp;
168 }
169 tmp_cpus[nr_cpus++] = (int)start_cpu;
170 }
171 if (*p)
172 ++p;
173
174 cpu_list = p;
175 }
176
177 if (nr_cpus > 0)
178 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
179 else
180 cpus = cpu_map__default_new();
181invalid:
182 free(tmp_cpus);
183out:
184 return cpus;
185}
186
187static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
188{
189 struct cpu_map *map;
190
191 map = cpu_map__empty_new(cpus->nr);
192 if (map) {
193 unsigned i;
194
195 for (i = 0; i < cpus->nr; i++) {
196 /*
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.
200 */
201 if (cpus->cpu[i] == (u16) -1)
202 map->map[i] = -1;
203 else
204 map->map[i] = (int) cpus->cpu[i];
205 }
206 }
207
208 return map;
209}
210
211static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
212{
213 struct cpu_map *map;
214 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
215
216 nr = bitmap_weight(mask->mask, nbits);
217
218 map = cpu_map__empty_new(nr);
219 if (map) {
220 int cpu, i = 0;
221
222 for_each_set_bit(cpu, mask->mask, nbits)
223 map->map[i++] = cpu;
224 }
225 return map;
226
227}
228
229struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
230{
231 if (data->type == PERF_CPU_MAP__CPUS)
232 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
233 else
234 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
235}
236
237size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
238{
239 int i;
240 size_t printed = fprintf(fp, "%d cpu%s: ",
241 map->nr, map->nr > 1 ? "s" : "");
242 for (i = 0; i < map->nr; ++i)
243 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
244
245 return printed + fprintf(fp, "\n");
246}
247
248struct cpu_map *cpu_map__dummy_new(void)
249{
250 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
251
252 if (cpus != NULL) {
253 cpus->nr = 1;
254 cpus->map[0] = -1;
255 atomic_set(&cpus->refcnt, 1);
256 }
257
258 return cpus;
259}
260
261struct cpu_map *cpu_map__empty_new(int nr)
262{
263 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
264
265 if (cpus != NULL) {
266 int i;
267
268 cpus->nr = nr;
269 for (i = 0; i < nr; i++)
270 cpus->map[i] = -1;
271
272 atomic_set(&cpus->refcnt, 1);
273 }
274
275 return cpus;
276}
277
278static void cpu_map__delete(struct cpu_map *map)
279{
280 if (map) {
281 WARN_ONCE(atomic_read(&map->refcnt) != 0,
282 "cpu_map refcnt unbalanced\n");
283 free(map);
284 }
285}
286
287struct cpu_map *cpu_map__get(struct cpu_map *map)
288{
289 if (map)
290 atomic_inc(&map->refcnt);
291 return map;
292}
293
294void cpu_map__put(struct cpu_map *map)
295{
296 if (map && atomic_dec_and_test(&map->refcnt))
297 cpu_map__delete(map);
298}
299
300static int cpu__get_topology_int(int cpu, const char *name, int *value)
301{
302 char path[PATH_MAX];
303
304 snprintf(path, PATH_MAX,
305 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
306
307 return sysfs__read_int(path, value);
308}
309
310int cpu_map__get_socket_id(int cpu)
311{
312 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
313 return ret ?: value;
314}
315
316int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
317{
318 int cpu;
319
320 if (idx > map->nr)
321 return -1;
322
323 cpu = map->map[idx];
324
325 return cpu_map__get_socket_id(cpu);
326}
327
328static int cmp_ids(const void *a, const void *b)
329{
330 return *(int *)a - *(int *)b;
331}
332
333int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
334 int (*f)(struct cpu_map *map, int cpu, void *data),
335 void *data)
336{
337 struct cpu_map *c;
338 int nr = cpus->nr;
339 int cpu, s1, s2;
340
341 /* allocate as much as possible */
342 c = calloc(1, sizeof(*c) + nr * sizeof(int));
343 if (!c)
344 return -1;
345
346 for (cpu = 0; cpu < nr; cpu++) {
347 s1 = f(cpus, cpu, data);
348 for (s2 = 0; s2 < c->nr; s2++) {
349 if (s1 == c->map[s2])
350 break;
351 }
352 if (s2 == c->nr) {
353 c->map[c->nr] = s1;
354 c->nr++;
355 }
356 }
357 /* ensure we process id in increasing order */
358 qsort(c->map, c->nr, sizeof(int), cmp_ids);
359
360 atomic_set(&c->refcnt, 1);
361 *res = c;
362 return 0;
363}
364
365int cpu_map__get_core_id(int cpu)
366{
367 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
368 return ret ?: value;
369}
370
371int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
372{
373 int cpu, s;
374
375 if (idx > map->nr)
376 return -1;
377
378 cpu = map->map[idx];
379
380 cpu = cpu_map__get_core_id(cpu);
381
382 s = cpu_map__get_socket(map, idx, data);
383 if (s == -1)
384 return -1;
385
386 /*
387 * encode socket in upper 16 bits
388 * core_id is relative to socket, and
389 * we need a global id. So we combine
390 * socket+ core id
391 */
392 return (s << 16) | (cpu & 0xffff);
393}
394
395int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
396{
397 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
398}
399
400int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
401{
402 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
403}
404
405/* setup simple routines to easily access node numbers given a cpu number */
406static int get_max_num(char *path, int *max)
407{
408 size_t num;
409 char *buf;
410 int err = 0;
411
412 if (filename__read_str(path, &buf, &num))
413 return -1;
414
415 buf[num] = '\0';
416
417 /* start on the right, to find highest node num */
418 while (--num) {
419 if ((buf[num] == ',') || (buf[num] == '-')) {
420 num++;
421 break;
422 }
423 }
424 if (sscanf(&buf[num], "%d", max) < 1) {
425 err = -1;
426 goto out;
427 }
428
429 /* convert from 0-based to 1-based */
430 (*max)++;
431
432out:
433 free(buf);
434 return err;
435}
436
437/* Determine highest possible cpu in the system for sparse allocation */
438static void set_max_cpu_num(void)
439{
440 const char *mnt;
441 char path[PATH_MAX];
442 int ret = -1;
443
444 /* set up default */
445 max_cpu_num = 4096;
446
447 mnt = sysfs__mountpoint();
448 if (!mnt)
449 goto out;
450
451 /* get the highest possible cpu number for a sparse allocation */
452 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
453 if (ret == PATH_MAX) {
454 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
455 goto out;
456 }
457
458 ret = get_max_num(path, &max_cpu_num);
459
460out:
461 if (ret)
462 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
463}
464
465/* Determine highest possible node in the system for sparse allocation */
466static void set_max_node_num(void)
467{
468 const char *mnt;
469 char path[PATH_MAX];
470 int ret = -1;
471
472 /* set up default */
473 max_node_num = 8;
474
475 mnt = sysfs__mountpoint();
476 if (!mnt)
477 goto out;
478
479 /* get the highest possible cpu number for a sparse allocation */
480 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
481 if (ret == PATH_MAX) {
482 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
483 goto out;
484 }
485
486 ret = get_max_num(path, &max_node_num);
487
488out:
489 if (ret)
490 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
491}
492
493int cpu__max_node(void)
494{
495 if (unlikely(!max_node_num))
496 set_max_node_num();
497
498 return max_node_num;
499}
500
501int cpu__max_cpu(void)
502{
503 if (unlikely(!max_cpu_num))
504 set_max_cpu_num();
505
506 return max_cpu_num;
507}
508
509int cpu__get_node(int cpu)
510{
511 if (unlikely(cpunode_map == NULL)) {
512 pr_debug("cpu_map not initialized\n");
513 return -1;
514 }
515
516 return cpunode_map[cpu];
517}
518
519static int init_cpunode_map(void)
520{
521 int i;
522
523 set_max_cpu_num();
524 set_max_node_num();
525
526 cpunode_map = calloc(max_cpu_num, sizeof(int));
527 if (!cpunode_map) {
528 pr_err("%s: calloc failed\n", __func__);
529 return -1;
530 }
531
532 for (i = 0; i < max_cpu_num; i++)
533 cpunode_map[i] = -1;
534
535 return 0;
536}
537
538int cpu__setup_cpunode_map(void)
539{
540 struct dirent *dent1, *dent2;
541 DIR *dir1, *dir2;
542 unsigned int cpu, mem;
543 char buf[PATH_MAX];
544 char path[PATH_MAX];
545 const char *mnt;
546 int n;
547
548 /* initialize globals */
549 if (init_cpunode_map())
550 return -1;
551
552 mnt = sysfs__mountpoint();
553 if (!mnt)
554 return 0;
555
556 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
557 if (n == PATH_MAX) {
558 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
559 return -1;
560 }
561
562 dir1 = opendir(path);
563 if (!dir1)
564 return 0;
565
566 /* walk tree and setup map */
567 while ((dent1 = readdir(dir1)) != NULL) {
568 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
569 continue;
570
571 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
572 if (n == PATH_MAX) {
573 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
574 continue;
575 }
576
577 dir2 = opendir(buf);
578 if (!dir2)
579 continue;
580 while ((dent2 = readdir(dir2)) != NULL) {
581 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
582 continue;
583 cpunode_map[cpu] = mem;
584 }
585 closedir(dir2);
586 }
587 closedir(dir1);
588 return 0;
589}