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1// SPDX-License-Identifier: GPL-2.0
2#include "util.h"
3#include <api/fs/fs.h>
4#include "../perf.h"
5#include "cpumap.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 "sane_ctype.h"
14
15static int max_cpu_num;
16static int max_present_cpu_num;
17static int max_node_num;
18static int *cpunode_map;
19
20static struct cpu_map *cpu_map__default_new(void)
21{
22 struct cpu_map *cpus;
23 int nr_cpus;
24
25 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
26 if (nr_cpus < 0)
27 return NULL;
28
29 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
30 if (cpus != NULL) {
31 int i;
32 for (i = 0; i < nr_cpus; ++i)
33 cpus->map[i] = i;
34
35 cpus->nr = nr_cpus;
36 refcount_set(&cpus->refcnt, 1);
37 }
38
39 return cpus;
40}
41
42static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
43{
44 size_t payload_size = nr_cpus * sizeof(int);
45 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
46
47 if (cpus != NULL) {
48 cpus->nr = nr_cpus;
49 memcpy(cpus->map, tmp_cpus, payload_size);
50 refcount_set(&cpus->refcnt, 1);
51 }
52
53 return cpus;
54}
55
56struct cpu_map *cpu_map__read(FILE *file)
57{
58 struct cpu_map *cpus = NULL;
59 int nr_cpus = 0;
60 int *tmp_cpus = NULL, *tmp;
61 int max_entries = 0;
62 int n, cpu, prev;
63 char sep;
64
65 sep = 0;
66 prev = -1;
67 for (;;) {
68 n = fscanf(file, "%u%c", &cpu, &sep);
69 if (n <= 0)
70 break;
71 if (prev >= 0) {
72 int new_max = nr_cpus + cpu - prev - 1;
73
74 if (new_max >= max_entries) {
75 max_entries = new_max + MAX_NR_CPUS / 2;
76 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
77 if (tmp == NULL)
78 goto out_free_tmp;
79 tmp_cpus = tmp;
80 }
81
82 while (++prev < cpu)
83 tmp_cpus[nr_cpus++] = prev;
84 }
85 if (nr_cpus == max_entries) {
86 max_entries += MAX_NR_CPUS;
87 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
88 if (tmp == NULL)
89 goto out_free_tmp;
90 tmp_cpus = tmp;
91 }
92
93 tmp_cpus[nr_cpus++] = cpu;
94 if (n == 2 && sep == '-')
95 prev = cpu;
96 else
97 prev = -1;
98 if (n == 1 || sep == '\n')
99 break;
100 }
101
102 if (nr_cpus > 0)
103 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
104 else
105 cpus = cpu_map__default_new();
106out_free_tmp:
107 free(tmp_cpus);
108 return cpus;
109}
110
111static struct cpu_map *cpu_map__read_all_cpu_map(void)
112{
113 struct cpu_map *cpus = NULL;
114 FILE *onlnf;
115
116 onlnf = fopen("/sys/devices/system/cpu/online", "r");
117 if (!onlnf)
118 return cpu_map__default_new();
119
120 cpus = cpu_map__read(onlnf);
121 fclose(onlnf);
122 return cpus;
123}
124
125struct cpu_map *cpu_map__new(const char *cpu_list)
126{
127 struct cpu_map *cpus = NULL;
128 unsigned long start_cpu, end_cpu = 0;
129 char *p = NULL;
130 int i, nr_cpus = 0;
131 int *tmp_cpus = NULL, *tmp;
132 int max_entries = 0;
133
134 if (!cpu_list)
135 return cpu_map__read_all_cpu_map();
136
137 if (!isdigit(*cpu_list))
138 goto out;
139
140 while (isdigit(*cpu_list)) {
141 p = NULL;
142 start_cpu = strtoul(cpu_list, &p, 0);
143 if (start_cpu >= INT_MAX
144 || (*p != '\0' && *p != ',' && *p != '-'))
145 goto invalid;
146
147 if (*p == '-') {
148 cpu_list = ++p;
149 p = NULL;
150 end_cpu = strtoul(cpu_list, &p, 0);
151
152 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
153 goto invalid;
154
155 if (end_cpu < start_cpu)
156 goto invalid;
157 } else {
158 end_cpu = start_cpu;
159 }
160
161 for (; start_cpu <= end_cpu; start_cpu++) {
162 /* check for duplicates */
163 for (i = 0; i < nr_cpus; i++)
164 if (tmp_cpus[i] == (int)start_cpu)
165 goto invalid;
166
167 if (nr_cpus == max_entries) {
168 max_entries += MAX_NR_CPUS;
169 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
170 if (tmp == NULL)
171 goto invalid;
172 tmp_cpus = tmp;
173 }
174 tmp_cpus[nr_cpus++] = (int)start_cpu;
175 }
176 if (*p)
177 ++p;
178
179 cpu_list = p;
180 }
181
182 if (nr_cpus > 0)
183 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
184 else
185 cpus = cpu_map__default_new();
186invalid:
187 free(tmp_cpus);
188out:
189 return cpus;
190}
191
192static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
193{
194 struct cpu_map *map;
195
196 map = cpu_map__empty_new(cpus->nr);
197 if (map) {
198 unsigned i;
199
200 for (i = 0; i < cpus->nr; i++) {
201 /*
202 * Special treatment for -1, which is not real cpu number,
203 * and we need to use (int) -1 to initialize map[i],
204 * otherwise it would become 65535.
205 */
206 if (cpus->cpu[i] == (u16) -1)
207 map->map[i] = -1;
208 else
209 map->map[i] = (int) cpus->cpu[i];
210 }
211 }
212
213 return map;
214}
215
216static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
217{
218 struct cpu_map *map;
219 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
220
221 nr = bitmap_weight(mask->mask, nbits);
222
223 map = cpu_map__empty_new(nr);
224 if (map) {
225 int cpu, i = 0;
226
227 for_each_set_bit(cpu, mask->mask, nbits)
228 map->map[i++] = cpu;
229 }
230 return map;
231
232}
233
234struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
235{
236 if (data->type == PERF_CPU_MAP__CPUS)
237 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
238 else
239 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
240}
241
242size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
243{
244#define BUFSIZE 1024
245 char buf[BUFSIZE];
246
247 cpu_map__snprint(map, buf, sizeof(buf));
248 return fprintf(fp, "%s\n", buf);
249#undef BUFSIZE
250}
251
252struct cpu_map *cpu_map__dummy_new(void)
253{
254 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
255
256 if (cpus != NULL) {
257 cpus->nr = 1;
258 cpus->map[0] = -1;
259 refcount_set(&cpus->refcnt, 1);
260 }
261
262 return cpus;
263}
264
265struct cpu_map *cpu_map__empty_new(int nr)
266{
267 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
268
269 if (cpus != NULL) {
270 int i;
271
272 cpus->nr = nr;
273 for (i = 0; i < nr; i++)
274 cpus->map[i] = -1;
275
276 refcount_set(&cpus->refcnt, 1);
277 }
278
279 return cpus;
280}
281
282static void cpu_map__delete(struct cpu_map *map)
283{
284 if (map) {
285 WARN_ONCE(refcount_read(&map->refcnt) != 0,
286 "cpu_map refcnt unbalanced\n");
287 free(map);
288 }
289}
290
291struct cpu_map *cpu_map__get(struct cpu_map *map)
292{
293 if (map)
294 refcount_inc(&map->refcnt);
295 return map;
296}
297
298void cpu_map__put(struct cpu_map *map)
299{
300 if (map && refcount_dec_and_test(&map->refcnt))
301 cpu_map__delete(map);
302}
303
304static int cpu__get_topology_int(int cpu, const char *name, int *value)
305{
306 char path[PATH_MAX];
307
308 snprintf(path, PATH_MAX,
309 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
310
311 return sysfs__read_int(path, value);
312}
313
314int cpu_map__get_socket_id(int cpu)
315{
316 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
317 return ret ?: value;
318}
319
320int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
321{
322 int cpu;
323
324 if (idx > map->nr)
325 return -1;
326
327 cpu = map->map[idx];
328
329 return cpu_map__get_socket_id(cpu);
330}
331
332static int cmp_ids(const void *a, const void *b)
333{
334 return *(int *)a - *(int *)b;
335}
336
337int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
338 int (*f)(struct cpu_map *map, int cpu, void *data),
339 void *data)
340{
341 struct cpu_map *c;
342 int nr = cpus->nr;
343 int cpu, s1, s2;
344
345 /* allocate as much as possible */
346 c = calloc(1, sizeof(*c) + nr * sizeof(int));
347 if (!c)
348 return -1;
349
350 for (cpu = 0; cpu < nr; cpu++) {
351 s1 = f(cpus, cpu, data);
352 for (s2 = 0; s2 < c->nr; s2++) {
353 if (s1 == c->map[s2])
354 break;
355 }
356 if (s2 == c->nr) {
357 c->map[c->nr] = s1;
358 c->nr++;
359 }
360 }
361 /* ensure we process id in increasing order */
362 qsort(c->map, c->nr, sizeof(int), cmp_ids);
363
364 refcount_set(&c->refcnt, 1);
365 *res = c;
366 return 0;
367}
368
369int cpu_map__get_core_id(int cpu)
370{
371 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
372 return ret ?: value;
373}
374
375int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
376{
377 int cpu, s;
378
379 if (idx > map->nr)
380 return -1;
381
382 cpu = map->map[idx];
383
384 cpu = cpu_map__get_core_id(cpu);
385
386 s = cpu_map__get_socket(map, idx, data);
387 if (s == -1)
388 return -1;
389
390 /*
391 * encode socket in upper 16 bits
392 * core_id is relative to socket, and
393 * we need a global id. So we combine
394 * socket+ core id
395 */
396 return (s << 16) | (cpu & 0xffff);
397}
398
399int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
400{
401 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
402}
403
404int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
405{
406 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
407}
408
409/* setup simple routines to easily access node numbers given a cpu number */
410static int get_max_num(char *path, int *max)
411{
412 size_t num;
413 char *buf;
414 int err = 0;
415
416 if (filename__read_str(path, &buf, &num))
417 return -1;
418
419 buf[num] = '\0';
420
421 /* start on the right, to find highest node num */
422 while (--num) {
423 if ((buf[num] == ',') || (buf[num] == '-')) {
424 num++;
425 break;
426 }
427 }
428 if (sscanf(&buf[num], "%d", max) < 1) {
429 err = -1;
430 goto out;
431 }
432
433 /* convert from 0-based to 1-based */
434 (*max)++;
435
436out:
437 free(buf);
438 return err;
439}
440
441/* Determine highest possible cpu in the system for sparse allocation */
442static void set_max_cpu_num(void)
443{
444 const char *mnt;
445 char path[PATH_MAX];
446 int ret = -1;
447
448 /* set up default */
449 max_cpu_num = 4096;
450 max_present_cpu_num = 4096;
451
452 mnt = sysfs__mountpoint();
453 if (!mnt)
454 goto out;
455
456 /* get the highest possible cpu number for a sparse allocation */
457 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
458 if (ret == PATH_MAX) {
459 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
460 goto out;
461 }
462
463 ret = get_max_num(path, &max_cpu_num);
464 if (ret)
465 goto out;
466
467 /* get the highest present cpu number for a sparse allocation */
468 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
469 if (ret == PATH_MAX) {
470 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
471 goto out;
472 }
473
474 ret = get_max_num(path, &max_present_cpu_num);
475
476out:
477 if (ret)
478 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
479}
480
481/* Determine highest possible node in the system for sparse allocation */
482static void set_max_node_num(void)
483{
484 const char *mnt;
485 char path[PATH_MAX];
486 int ret = -1;
487
488 /* set up default */
489 max_node_num = 8;
490
491 mnt = sysfs__mountpoint();
492 if (!mnt)
493 goto out;
494
495 /* get the highest possible cpu number for a sparse allocation */
496 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
497 if (ret == PATH_MAX) {
498 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
499 goto out;
500 }
501
502 ret = get_max_num(path, &max_node_num);
503
504out:
505 if (ret)
506 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
507}
508
509int cpu__max_node(void)
510{
511 if (unlikely(!max_node_num))
512 set_max_node_num();
513
514 return max_node_num;
515}
516
517int cpu__max_cpu(void)
518{
519 if (unlikely(!max_cpu_num))
520 set_max_cpu_num();
521
522 return max_cpu_num;
523}
524
525int cpu__max_present_cpu(void)
526{
527 if (unlikely(!max_present_cpu_num))
528 set_max_cpu_num();
529
530 return max_present_cpu_num;
531}
532
533
534int cpu__get_node(int cpu)
535{
536 if (unlikely(cpunode_map == NULL)) {
537 pr_debug("cpu_map not initialized\n");
538 return -1;
539 }
540
541 return cpunode_map[cpu];
542}
543
544static int init_cpunode_map(void)
545{
546 int i;
547
548 set_max_cpu_num();
549 set_max_node_num();
550
551 cpunode_map = calloc(max_cpu_num, sizeof(int));
552 if (!cpunode_map) {
553 pr_err("%s: calloc failed\n", __func__);
554 return -1;
555 }
556
557 for (i = 0; i < max_cpu_num; i++)
558 cpunode_map[i] = -1;
559
560 return 0;
561}
562
563int cpu__setup_cpunode_map(void)
564{
565 struct dirent *dent1, *dent2;
566 DIR *dir1, *dir2;
567 unsigned int cpu, mem;
568 char buf[PATH_MAX];
569 char path[PATH_MAX];
570 const char *mnt;
571 int n;
572
573 /* initialize globals */
574 if (init_cpunode_map())
575 return -1;
576
577 mnt = sysfs__mountpoint();
578 if (!mnt)
579 return 0;
580
581 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
582 if (n == PATH_MAX) {
583 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
584 return -1;
585 }
586
587 dir1 = opendir(path);
588 if (!dir1)
589 return 0;
590
591 /* walk tree and setup map */
592 while ((dent1 = readdir(dir1)) != NULL) {
593 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
594 continue;
595
596 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
597 if (n == PATH_MAX) {
598 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
599 continue;
600 }
601
602 dir2 = opendir(buf);
603 if (!dir2)
604 continue;
605 while ((dent2 = readdir(dir2)) != NULL) {
606 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
607 continue;
608 cpunode_map[cpu] = mem;
609 }
610 closedir(dir2);
611 }
612 closedir(dir1);
613 return 0;
614}
615
616bool cpu_map__has(struct cpu_map *cpus, int cpu)
617{
618 return cpu_map__idx(cpus, cpu) != -1;
619}
620
621int cpu_map__idx(struct cpu_map *cpus, int cpu)
622{
623 int i;
624
625 for (i = 0; i < cpus->nr; ++i) {
626 if (cpus->map[i] == cpu)
627 return i;
628 }
629
630 return -1;
631}
632
633int cpu_map__cpu(struct cpu_map *cpus, int idx)
634{
635 return cpus->map[idx];
636}
637
638size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
639{
640 int i, cpu, start = -1;
641 bool first = true;
642 size_t ret = 0;
643
644#define COMMA first ? "" : ","
645
646 for (i = 0; i < map->nr + 1; i++) {
647 bool last = i == map->nr;
648
649 cpu = last ? INT_MAX : map->map[i];
650
651 if (start == -1) {
652 start = i;
653 if (last) {
654 ret += snprintf(buf + ret, size - ret,
655 "%s%d", COMMA,
656 map->map[i]);
657 }
658 } else if (((i - start) != (cpu - map->map[start])) || last) {
659 int end = i - 1;
660
661 if (start == end) {
662 ret += snprintf(buf + ret, size - ret,
663 "%s%d", COMMA,
664 map->map[start]);
665 } else {
666 ret += snprintf(buf + ret, size - ret,
667 "%s%d-%d", COMMA,
668 map->map[start], map->map[end]);
669 }
670 first = false;
671 start = i;
672 }
673 }
674
675#undef COMMA
676
677 pr_debug("cpumask list: %s\n", buf);
678 return ret;
679}
680
681static char hex_char(unsigned char val)
682{
683 if (val < 10)
684 return val + '0';
685 if (val < 16)
686 return val - 10 + 'a';
687 return '?';
688}
689
690size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
691{
692 int i, cpu;
693 char *ptr = buf;
694 unsigned char *bitmap;
695 int last_cpu = cpu_map__cpu(map, map->nr - 1);
696
697 bitmap = zalloc((last_cpu + 7) / 8);
698 if (bitmap == NULL) {
699 buf[0] = '\0';
700 return 0;
701 }
702
703 for (i = 0; i < map->nr; i++) {
704 cpu = cpu_map__cpu(map, i);
705 bitmap[cpu / 8] |= 1 << (cpu % 8);
706 }
707
708 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
709 unsigned char bits = bitmap[cpu / 8];
710
711 if (cpu % 8)
712 bits >>= 4;
713 else
714 bits &= 0xf;
715
716 *ptr++ = hex_char(bits);
717 if ((cpu % 32) == 0 && cpu > 0)
718 *ptr++ = ',';
719 }
720 *ptr = '\0';
721 free(bitmap);
722
723 buf[size - 1] = '\0';
724 return ptr - buf;
725}
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 map->map[i].cpu = -1;
81 else
82 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 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 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 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 = malloc(sizeof(*cpus) + sizeof(int) * nr);
164
165 if (cpus != NULL) {
166 int i;
167
168 cpus->nr = nr;
169 for (i = 0; i < nr; i++)
170 cpus->map[i].cpu = -1;
171
172 refcount_set(&cpus->refcnt, 1);
173 }
174
175 return cpus;
176}
177
178struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr)
179{
180 struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr);
181
182 if (cpus != NULL) {
183 int i;
184
185 cpus->nr = nr;
186 for (i = 0; i < nr; i++)
187 cpus->map[i] = aggr_cpu_id__empty();
188
189 refcount_set(&cpus->refcnt, 1);
190 }
191
192 return cpus;
193}
194
195static int cpu__get_topology_int(int cpu, const char *name, int *value)
196{
197 char path[PATH_MAX];
198
199 snprintf(path, PATH_MAX,
200 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
201
202 return sysfs__read_int(path, value);
203}
204
205int cpu__get_socket_id(struct perf_cpu cpu)
206{
207 int value, ret = cpu__get_topology_int(cpu.cpu, "physical_package_id", &value);
208 return ret ?: value;
209}
210
211struct aggr_cpu_id aggr_cpu_id__socket(struct perf_cpu cpu, void *data __maybe_unused)
212{
213 struct aggr_cpu_id id = aggr_cpu_id__empty();
214
215 id.socket = cpu__get_socket_id(cpu);
216 return id;
217}
218
219static int aggr_cpu_id__cmp(const void *a_pointer, const void *b_pointer)
220{
221 struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
222 struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
223
224 if (a->node != b->node)
225 return a->node - b->node;
226 else if (a->socket != b->socket)
227 return a->socket - b->socket;
228 else if (a->die != b->die)
229 return a->die - b->die;
230 else if (a->core != b->core)
231 return a->core - b->core;
232 else
233 return a->thread_idx - b->thread_idx;
234}
235
236struct cpu_aggr_map *cpu_aggr_map__new(const struct perf_cpu_map *cpus,
237 aggr_cpu_id_get_t get_id,
238 void *data, bool needs_sort)
239{
240 int idx;
241 struct perf_cpu cpu;
242 struct cpu_aggr_map *c = cpu_aggr_map__empty_new(cpus->nr);
243
244 if (!c)
245 return NULL;
246
247 /* Reset size as it may only be partially filled */
248 c->nr = 0;
249
250 perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
251 bool duplicate = false;
252 struct aggr_cpu_id cpu_id = get_id(cpu, data);
253
254 for (int j = 0; j < c->nr; j++) {
255 if (aggr_cpu_id__equal(&cpu_id, &c->map[j])) {
256 duplicate = true;
257 break;
258 }
259 }
260 if (!duplicate) {
261 c->map[c->nr] = cpu_id;
262 c->nr++;
263 }
264 }
265 /* Trim. */
266 if (c->nr != cpus->nr) {
267 struct cpu_aggr_map *trimmed_c =
268 realloc(c,
269 sizeof(struct cpu_aggr_map) + sizeof(struct aggr_cpu_id) * c->nr);
270
271 if (trimmed_c)
272 c = trimmed_c;
273 }
274
275 /* ensure we process id in increasing order */
276 if (needs_sort)
277 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), aggr_cpu_id__cmp);
278
279 return c;
280
281}
282
283int cpu__get_die_id(struct perf_cpu cpu)
284{
285 int value, ret = cpu__get_topology_int(cpu.cpu, "die_id", &value);
286
287 return ret ?: value;
288}
289
290struct aggr_cpu_id aggr_cpu_id__die(struct perf_cpu cpu, void *data)
291{
292 struct aggr_cpu_id id;
293 int die;
294
295 die = cpu__get_die_id(cpu);
296 /* There is no die_id on legacy system. */
297 if (die == -1)
298 die = 0;
299
300 /*
301 * die_id is relative to socket, so start
302 * with the socket ID and then add die to
303 * make a unique ID.
304 */
305 id = aggr_cpu_id__socket(cpu, data);
306 if (aggr_cpu_id__is_empty(&id))
307 return id;
308
309 id.die = die;
310 return id;
311}
312
313int cpu__get_core_id(struct perf_cpu cpu)
314{
315 int value, ret = cpu__get_topology_int(cpu.cpu, "core_id", &value);
316 return ret ?: value;
317}
318
319struct aggr_cpu_id aggr_cpu_id__core(struct perf_cpu cpu, void *data)
320{
321 struct aggr_cpu_id id;
322 int core = cpu__get_core_id(cpu);
323
324 /* aggr_cpu_id__die returns a struct with socket and die set. */
325 id = aggr_cpu_id__die(cpu, data);
326 if (aggr_cpu_id__is_empty(&id))
327 return id;
328
329 /*
330 * core_id is relative to socket and die, we need a global id.
331 * So we combine the result from cpu_map__get_die with the core id
332 */
333 id.core = core;
334 return id;
335
336}
337
338struct aggr_cpu_id aggr_cpu_id__cpu(struct perf_cpu cpu, void *data)
339{
340 struct aggr_cpu_id id;
341
342 /* aggr_cpu_id__core returns a struct with socket, die and core set. */
343 id = aggr_cpu_id__core(cpu, data);
344 if (aggr_cpu_id__is_empty(&id))
345 return id;
346
347 id.cpu = cpu;
348 return id;
349
350}
351
352struct aggr_cpu_id aggr_cpu_id__node(struct perf_cpu cpu, void *data __maybe_unused)
353{
354 struct aggr_cpu_id id = aggr_cpu_id__empty();
355
356 id.node = cpu__get_node(cpu);
357 return id;
358}
359
360struct aggr_cpu_id aggr_cpu_id__global(struct perf_cpu cpu, void *data __maybe_unused)
361{
362 struct aggr_cpu_id id = aggr_cpu_id__empty();
363
364 /* it always aggregates to the cpu 0 */
365 cpu.cpu = 0;
366 id.cpu = cpu;
367 return id;
368}
369
370/* setup simple routines to easily access node numbers given a cpu number */
371static int get_max_num(char *path, int *max)
372{
373 size_t num;
374 char *buf;
375 int err = 0;
376
377 if (filename__read_str(path, &buf, &num))
378 return -1;
379
380 buf[num] = '\0';
381
382 /* start on the right, to find highest node num */
383 while (--num) {
384 if ((buf[num] == ',') || (buf[num] == '-')) {
385 num++;
386 break;
387 }
388 }
389 if (sscanf(&buf[num], "%d", max) < 1) {
390 err = -1;
391 goto out;
392 }
393
394 /* convert from 0-based to 1-based */
395 (*max)++;
396
397out:
398 free(buf);
399 return err;
400}
401
402/* Determine highest possible cpu in the system for sparse allocation */
403static void set_max_cpu_num(void)
404{
405 const char *mnt;
406 char path[PATH_MAX];
407 int ret = -1;
408
409 /* set up default */
410 max_cpu_num.cpu = 4096;
411 max_present_cpu_num.cpu = 4096;
412
413 mnt = sysfs__mountpoint();
414 if (!mnt)
415 goto out;
416
417 /* get the highest possible cpu number for a sparse allocation */
418 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
419 if (ret >= PATH_MAX) {
420 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
421 goto out;
422 }
423
424 ret = get_max_num(path, &max_cpu_num.cpu);
425 if (ret)
426 goto out;
427
428 /* get the highest present cpu number for a sparse allocation */
429 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
430 if (ret >= PATH_MAX) {
431 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
432 goto out;
433 }
434
435 ret = get_max_num(path, &max_present_cpu_num.cpu);
436
437out:
438 if (ret)
439 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num.cpu);
440}
441
442/* Determine highest possible node in the system for sparse allocation */
443static void set_max_node_num(void)
444{
445 const char *mnt;
446 char path[PATH_MAX];
447 int ret = -1;
448
449 /* set up default */
450 max_node_num = 8;
451
452 mnt = sysfs__mountpoint();
453 if (!mnt)
454 goto out;
455
456 /* get the highest possible cpu number for a sparse allocation */
457 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
458 if (ret >= PATH_MAX) {
459 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
460 goto out;
461 }
462
463 ret = get_max_num(path, &max_node_num);
464
465out:
466 if (ret)
467 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
468}
469
470int cpu__max_node(void)
471{
472 if (unlikely(!max_node_num))
473 set_max_node_num();
474
475 return max_node_num;
476}
477
478struct perf_cpu cpu__max_cpu(void)
479{
480 if (unlikely(!max_cpu_num.cpu))
481 set_max_cpu_num();
482
483 return max_cpu_num;
484}
485
486struct perf_cpu cpu__max_present_cpu(void)
487{
488 if (unlikely(!max_present_cpu_num.cpu))
489 set_max_cpu_num();
490
491 return max_present_cpu_num;
492}
493
494
495int cpu__get_node(struct perf_cpu cpu)
496{
497 if (unlikely(cpunode_map == NULL)) {
498 pr_debug("cpu_map not initialized\n");
499 return -1;
500 }
501
502 return cpunode_map[cpu.cpu];
503}
504
505static int init_cpunode_map(void)
506{
507 int i;
508
509 set_max_cpu_num();
510 set_max_node_num();
511
512 cpunode_map = calloc(max_cpu_num.cpu, sizeof(int));
513 if (!cpunode_map) {
514 pr_err("%s: calloc failed\n", __func__);
515 return -1;
516 }
517
518 for (i = 0; i < max_cpu_num.cpu; i++)
519 cpunode_map[i] = -1;
520
521 return 0;
522}
523
524int cpu__setup_cpunode_map(void)
525{
526 struct dirent *dent1, *dent2;
527 DIR *dir1, *dir2;
528 unsigned int cpu, mem;
529 char buf[PATH_MAX];
530 char path[PATH_MAX];
531 const char *mnt;
532 int n;
533
534 /* initialize globals */
535 if (init_cpunode_map())
536 return -1;
537
538 mnt = sysfs__mountpoint();
539 if (!mnt)
540 return 0;
541
542 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
543 if (n >= PATH_MAX) {
544 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
545 return -1;
546 }
547
548 dir1 = opendir(path);
549 if (!dir1)
550 return 0;
551
552 /* walk tree and setup map */
553 while ((dent1 = readdir(dir1)) != NULL) {
554 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
555 continue;
556
557 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
558 if (n >= PATH_MAX) {
559 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
560 continue;
561 }
562
563 dir2 = opendir(buf);
564 if (!dir2)
565 continue;
566 while ((dent2 = readdir(dir2)) != NULL) {
567 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
568 continue;
569 cpunode_map[cpu] = mem;
570 }
571 closedir(dir2);
572 }
573 closedir(dir1);
574 return 0;
575}
576
577size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
578{
579 int i, start = -1;
580 bool first = true;
581 size_t ret = 0;
582
583#define COMMA first ? "" : ","
584
585 for (i = 0; i < map->nr + 1; i++) {
586 struct perf_cpu cpu = { .cpu = INT_MAX };
587 bool last = i == map->nr;
588
589 if (!last)
590 cpu = map->map[i];
591
592 if (start == -1) {
593 start = i;
594 if (last) {
595 ret += snprintf(buf + ret, size - ret,
596 "%s%d", COMMA,
597 map->map[i].cpu);
598 }
599 } else if (((i - start) != (cpu.cpu - map->map[start].cpu)) || last) {
600 int end = i - 1;
601
602 if (start == end) {
603 ret += snprintf(buf + ret, size - ret,
604 "%s%d", COMMA,
605 map->map[start].cpu);
606 } else {
607 ret += snprintf(buf + ret, size - ret,
608 "%s%d-%d", COMMA,
609 map->map[start].cpu, map->map[end].cpu);
610 }
611 first = false;
612 start = i;
613 }
614 }
615
616#undef COMMA
617
618 pr_debug2("cpumask list: %s\n", buf);
619 return ret;
620}
621
622static char hex_char(unsigned char val)
623{
624 if (val < 10)
625 return val + '0';
626 if (val < 16)
627 return val - 10 + 'a';
628 return '?';
629}
630
631size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
632{
633 int i, cpu;
634 char *ptr = buf;
635 unsigned char *bitmap;
636 struct perf_cpu last_cpu = perf_cpu_map__cpu(map, map->nr - 1);
637
638 if (buf == NULL)
639 return 0;
640
641 bitmap = zalloc(last_cpu.cpu / 8 + 1);
642 if (bitmap == NULL) {
643 buf[0] = '\0';
644 return 0;
645 }
646
647 for (i = 0; i < map->nr; i++) {
648 cpu = perf_cpu_map__cpu(map, i).cpu;
649 bitmap[cpu / 8] |= 1 << (cpu % 8);
650 }
651
652 for (cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {
653 unsigned char bits = bitmap[cpu / 8];
654
655 if (cpu % 8)
656 bits >>= 4;
657 else
658 bits &= 0xf;
659
660 *ptr++ = hex_char(bits);
661 if ((cpu % 32) == 0 && cpu > 0)
662 *ptr++ = ',';
663 }
664 *ptr = '\0';
665 free(bitmap);
666
667 buf[size - 1] = '\0';
668 return ptr - buf;
669}
670
671const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
672{
673 static const struct perf_cpu_map *online = NULL;
674
675 if (!online)
676 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
677
678 return online;
679}
680
681bool aggr_cpu_id__equal(const struct aggr_cpu_id *a, const struct aggr_cpu_id *b)
682{
683 return a->thread_idx == b->thread_idx &&
684 a->node == b->node &&
685 a->socket == b->socket &&
686 a->die == b->die &&
687 a->core == b->core &&
688 a->cpu.cpu == b->cpu.cpu;
689}
690
691bool aggr_cpu_id__is_empty(const struct aggr_cpu_id *a)
692{
693 return a->thread_idx == -1 &&
694 a->node == -1 &&
695 a->socket == -1 &&
696 a->die == -1 &&
697 a->core == -1 &&
698 a->cpu.cpu == -1;
699}
700
701struct aggr_cpu_id aggr_cpu_id__empty(void)
702{
703 struct aggr_cpu_id ret = {
704 .thread_idx = -1,
705 .node = -1,
706 .socket = -1,
707 .die = -1,
708 .core = -1,
709 .cpu = (struct perf_cpu){ .cpu = -1 },
710 };
711 return ret;
712}