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1// SPDX-License-Identifier: GPL-2.0
2#include <api/fs/fs.h>
3#include "cpumap.h"
4#include "debug.h"
5#include "event.h"
6#include <assert.h>
7#include <dirent.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <linux/bitmap.h>
11#include "asm/bug.h"
12
13#include <linux/ctype.h>
14#include <linux/zalloc.h>
15
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}
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}