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