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1#include "util.h"
2#include "../perf.h"
3#include "cpumap.h"
4#include <assert.h>
5#include <stdio.h>
6
7static struct cpu_map *cpu_map__default_new(void)
8{
9 struct cpu_map *cpus;
10 int nr_cpus;
11
12 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
13 if (nr_cpus < 0)
14 return NULL;
15
16 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
17 if (cpus != NULL) {
18 int i;
19 for (i = 0; i < nr_cpus; ++i)
20 cpus->map[i] = i;
21
22 cpus->nr = nr_cpus;
23 }
24
25 return cpus;
26}
27
28static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
29{
30 size_t payload_size = nr_cpus * sizeof(int);
31 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
32
33 if (cpus != NULL) {
34 cpus->nr = nr_cpus;
35 memcpy(cpus->map, tmp_cpus, payload_size);
36 }
37
38 return cpus;
39}
40
41static struct cpu_map *cpu_map__read_all_cpu_map(void)
42{
43 struct cpu_map *cpus = NULL;
44 FILE *onlnf;
45 int nr_cpus = 0;
46 int *tmp_cpus = NULL, *tmp;
47 int max_entries = 0;
48 int n, cpu, prev;
49 char sep;
50
51 onlnf = fopen("/sys/devices/system/cpu/online", "r");
52 if (!onlnf)
53 return cpu_map__default_new();
54
55 sep = 0;
56 prev = -1;
57 for (;;) {
58 n = fscanf(onlnf, "%u%c", &cpu, &sep);
59 if (n <= 0)
60 break;
61 if (prev >= 0) {
62 int new_max = nr_cpus + cpu - prev - 1;
63
64 if (new_max >= max_entries) {
65 max_entries = new_max + MAX_NR_CPUS / 2;
66 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
67 if (tmp == NULL)
68 goto out_free_tmp;
69 tmp_cpus = tmp;
70 }
71
72 while (++prev < cpu)
73 tmp_cpus[nr_cpus++] = prev;
74 }
75 if (nr_cpus == max_entries) {
76 max_entries += MAX_NR_CPUS;
77 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
78 if (tmp == NULL)
79 goto out_free_tmp;
80 tmp_cpus = tmp;
81 }
82
83 tmp_cpus[nr_cpus++] = cpu;
84 if (n == 2 && sep == '-')
85 prev = cpu;
86 else
87 prev = -1;
88 if (n == 1 || sep == '\n')
89 break;
90 }
91
92 if (nr_cpus > 0)
93 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
94 else
95 cpus = cpu_map__default_new();
96out_free_tmp:
97 free(tmp_cpus);
98 fclose(onlnf);
99 return cpus;
100}
101
102struct cpu_map *cpu_map__new(const char *cpu_list)
103{
104 struct cpu_map *cpus = NULL;
105 unsigned long start_cpu, end_cpu = 0;
106 char *p = NULL;
107 int i, nr_cpus = 0;
108 int *tmp_cpus = NULL, *tmp;
109 int max_entries = 0;
110
111 if (!cpu_list)
112 return cpu_map__read_all_cpu_map();
113
114 if (!isdigit(*cpu_list))
115 goto out;
116
117 while (isdigit(*cpu_list)) {
118 p = NULL;
119 start_cpu = strtoul(cpu_list, &p, 0);
120 if (start_cpu >= INT_MAX
121 || (*p != '\0' && *p != ',' && *p != '-'))
122 goto invalid;
123
124 if (*p == '-') {
125 cpu_list = ++p;
126 p = NULL;
127 end_cpu = strtoul(cpu_list, &p, 0);
128
129 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
130 goto invalid;
131
132 if (end_cpu < start_cpu)
133 goto invalid;
134 } else {
135 end_cpu = start_cpu;
136 }
137
138 for (; start_cpu <= end_cpu; start_cpu++) {
139 /* check for duplicates */
140 for (i = 0; i < nr_cpus; i++)
141 if (tmp_cpus[i] == (int)start_cpu)
142 goto invalid;
143
144 if (nr_cpus == max_entries) {
145 max_entries += MAX_NR_CPUS;
146 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
147 if (tmp == NULL)
148 goto invalid;
149 tmp_cpus = tmp;
150 }
151 tmp_cpus[nr_cpus++] = (int)start_cpu;
152 }
153 if (*p)
154 ++p;
155
156 cpu_list = p;
157 }
158
159 if (nr_cpus > 0)
160 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
161 else
162 cpus = cpu_map__default_new();
163invalid:
164 free(tmp_cpus);
165out:
166 return cpus;
167}
168
169struct cpu_map *cpu_map__dummy_new(void)
170{
171 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
172
173 if (cpus != NULL) {
174 cpus->nr = 1;
175 cpus->map[0] = -1;
176 }
177
178 return cpus;
179}
180
181void cpu_map__delete(struct cpu_map *map)
182{
183 free(map);
184}
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#define BUFSIZE 1024
240 char buf[BUFSIZE];
241
242 cpu_map__snprint(map, buf, sizeof(buf));
243 return fprintf(fp, "%s\n", buf);
244#undef BUFSIZE
245}
246
247struct cpu_map *cpu_map__dummy_new(void)
248{
249 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
250
251 if (cpus != NULL) {
252 cpus->nr = 1;
253 cpus->map[0] = -1;
254 atomic_set(&cpus->refcnt, 1);
255 }
256
257 return cpus;
258}
259
260struct cpu_map *cpu_map__empty_new(int nr)
261{
262 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
263
264 if (cpus != NULL) {
265 int i;
266
267 cpus->nr = nr;
268 for (i = 0; i < nr; i++)
269 cpus->map[i] = -1;
270
271 atomic_set(&cpus->refcnt, 1);
272 }
273
274 return cpus;
275}
276
277static void cpu_map__delete(struct cpu_map *map)
278{
279 if (map) {
280 WARN_ONCE(atomic_read(&map->refcnt) != 0,
281 "cpu_map refcnt unbalanced\n");
282 free(map);
283 }
284}
285
286struct cpu_map *cpu_map__get(struct cpu_map *map)
287{
288 if (map)
289 atomic_inc(&map->refcnt);
290 return map;
291}
292
293void cpu_map__put(struct cpu_map *map)
294{
295 if (map && atomic_dec_and_test(&map->refcnt))
296 cpu_map__delete(map);
297}
298
299static int cpu__get_topology_int(int cpu, const char *name, int *value)
300{
301 char path[PATH_MAX];
302
303 snprintf(path, PATH_MAX,
304 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
305
306 return sysfs__read_int(path, value);
307}
308
309int cpu_map__get_socket_id(int cpu)
310{
311 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
312 return ret ?: value;
313}
314
315int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
316{
317 int cpu;
318
319 if (idx > map->nr)
320 return -1;
321
322 cpu = map->map[idx];
323
324 return cpu_map__get_socket_id(cpu);
325}
326
327static int cmp_ids(const void *a, const void *b)
328{
329 return *(int *)a - *(int *)b;
330}
331
332int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
333 int (*f)(struct cpu_map *map, int cpu, void *data),
334 void *data)
335{
336 struct cpu_map *c;
337 int nr = cpus->nr;
338 int cpu, s1, s2;
339
340 /* allocate as much as possible */
341 c = calloc(1, sizeof(*c) + nr * sizeof(int));
342 if (!c)
343 return -1;
344
345 for (cpu = 0; cpu < nr; cpu++) {
346 s1 = f(cpus, cpu, data);
347 for (s2 = 0; s2 < c->nr; s2++) {
348 if (s1 == c->map[s2])
349 break;
350 }
351 if (s2 == c->nr) {
352 c->map[c->nr] = s1;
353 c->nr++;
354 }
355 }
356 /* ensure we process id in increasing order */
357 qsort(c->map, c->nr, sizeof(int), cmp_ids);
358
359 atomic_set(&c->refcnt, 1);
360 *res = c;
361 return 0;
362}
363
364int cpu_map__get_core_id(int cpu)
365{
366 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
367 return ret ?: value;
368}
369
370int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
371{
372 int cpu, s;
373
374 if (idx > map->nr)
375 return -1;
376
377 cpu = map->map[idx];
378
379 cpu = cpu_map__get_core_id(cpu);
380
381 s = cpu_map__get_socket(map, idx, data);
382 if (s == -1)
383 return -1;
384
385 /*
386 * encode socket in upper 16 bits
387 * core_id is relative to socket, and
388 * we need a global id. So we combine
389 * socket+ core id
390 */
391 return (s << 16) | (cpu & 0xffff);
392}
393
394int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
395{
396 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
397}
398
399int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
400{
401 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
402}
403
404/* setup simple routines to easily access node numbers given a cpu number */
405static int get_max_num(char *path, int *max)
406{
407 size_t num;
408 char *buf;
409 int err = 0;
410
411 if (filename__read_str(path, &buf, &num))
412 return -1;
413
414 buf[num] = '\0';
415
416 /* start on the right, to find highest node num */
417 while (--num) {
418 if ((buf[num] == ',') || (buf[num] == '-')) {
419 num++;
420 break;
421 }
422 }
423 if (sscanf(&buf[num], "%d", max) < 1) {
424 err = -1;
425 goto out;
426 }
427
428 /* convert from 0-based to 1-based */
429 (*max)++;
430
431out:
432 free(buf);
433 return err;
434}
435
436/* Determine highest possible cpu in the system for sparse allocation */
437static void set_max_cpu_num(void)
438{
439 const char *mnt;
440 char path[PATH_MAX];
441 int ret = -1;
442
443 /* set up default */
444 max_cpu_num = 4096;
445
446 mnt = sysfs__mountpoint();
447 if (!mnt)
448 goto out;
449
450 /* get the highest possible cpu number for a sparse allocation */
451 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
452 if (ret == PATH_MAX) {
453 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
454 goto out;
455 }
456
457 ret = get_max_num(path, &max_cpu_num);
458
459out:
460 if (ret)
461 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
462}
463
464/* Determine highest possible node in the system for sparse allocation */
465static void set_max_node_num(void)
466{
467 const char *mnt;
468 char path[PATH_MAX];
469 int ret = -1;
470
471 /* set up default */
472 max_node_num = 8;
473
474 mnt = sysfs__mountpoint();
475 if (!mnt)
476 goto out;
477
478 /* get the highest possible cpu number for a sparse allocation */
479 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
480 if (ret == PATH_MAX) {
481 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
482 goto out;
483 }
484
485 ret = get_max_num(path, &max_node_num);
486
487out:
488 if (ret)
489 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
490}
491
492int cpu__max_node(void)
493{
494 if (unlikely(!max_node_num))
495 set_max_node_num();
496
497 return max_node_num;
498}
499
500int cpu__max_cpu(void)
501{
502 if (unlikely(!max_cpu_num))
503 set_max_cpu_num();
504
505 return max_cpu_num;
506}
507
508int cpu__get_node(int cpu)
509{
510 if (unlikely(cpunode_map == NULL)) {
511 pr_debug("cpu_map not initialized\n");
512 return -1;
513 }
514
515 return cpunode_map[cpu];
516}
517
518static int init_cpunode_map(void)
519{
520 int i;
521
522 set_max_cpu_num();
523 set_max_node_num();
524
525 cpunode_map = calloc(max_cpu_num, sizeof(int));
526 if (!cpunode_map) {
527 pr_err("%s: calloc failed\n", __func__);
528 return -1;
529 }
530
531 for (i = 0; i < max_cpu_num; i++)
532 cpunode_map[i] = -1;
533
534 return 0;
535}
536
537int cpu__setup_cpunode_map(void)
538{
539 struct dirent *dent1, *dent2;
540 DIR *dir1, *dir2;
541 unsigned int cpu, mem;
542 char buf[PATH_MAX];
543 char path[PATH_MAX];
544 const char *mnt;
545 int n;
546
547 /* initialize globals */
548 if (init_cpunode_map())
549 return -1;
550
551 mnt = sysfs__mountpoint();
552 if (!mnt)
553 return 0;
554
555 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
556 if (n == PATH_MAX) {
557 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
558 return -1;
559 }
560
561 dir1 = opendir(path);
562 if (!dir1)
563 return 0;
564
565 /* walk tree and setup map */
566 while ((dent1 = readdir(dir1)) != NULL) {
567 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
568 continue;
569
570 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
571 if (n == PATH_MAX) {
572 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
573 continue;
574 }
575
576 dir2 = opendir(buf);
577 if (!dir2)
578 continue;
579 while ((dent2 = readdir(dir2)) != NULL) {
580 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
581 continue;
582 cpunode_map[cpu] = mem;
583 }
584 closedir(dir2);
585 }
586 closedir(dir1);
587 return 0;
588}
589
590bool cpu_map__has(struct cpu_map *cpus, int cpu)
591{
592 return cpu_map__idx(cpus, cpu) != -1;
593}
594
595int cpu_map__idx(struct cpu_map *cpus, int cpu)
596{
597 int i;
598
599 for (i = 0; i < cpus->nr; ++i) {
600 if (cpus->map[i] == cpu)
601 return i;
602 }
603
604 return -1;
605}
606
607int cpu_map__cpu(struct cpu_map *cpus, int idx)
608{
609 return cpus->map[idx];
610}
611
612size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
613{
614 int i, cpu, start = -1;
615 bool first = true;
616 size_t ret = 0;
617
618#define COMMA first ? "" : ","
619
620 for (i = 0; i < map->nr + 1; i++) {
621 bool last = i == map->nr;
622
623 cpu = last ? INT_MAX : map->map[i];
624
625 if (start == -1) {
626 start = i;
627 if (last) {
628 ret += snprintf(buf + ret, size - ret,
629 "%s%d", COMMA,
630 map->map[i]);
631 }
632 } else if (((i - start) != (cpu - map->map[start])) || last) {
633 int end = i - 1;
634
635 if (start == end) {
636 ret += snprintf(buf + ret, size - ret,
637 "%s%d", COMMA,
638 map->map[start]);
639 } else {
640 ret += snprintf(buf + ret, size - ret,
641 "%s%d-%d", COMMA,
642 map->map[start], map->map[end]);
643 }
644 first = false;
645 start = i;
646 }
647 }
648
649#undef COMMA
650
651 pr_debug("cpumask list: %s\n", buf);
652 return ret;
653}