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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// 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}