1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 #include "counts.h"
3 #include "debug.h"
4 #include "evsel.h"
5 #include "hashmap.h"
6 #include "hwmon_pmu.h"
7 #include "pmu.h"
8 #include <internal/xyarray.h>
9 #include <internal/threadmap.h>
10 #include <perf/threadmap.h>
11 #include <sys/types.h>
12 #include <assert.h>
13 #include <ctype.h>
14 #include <fcntl.h>
15 #include <stddef.h>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <api/fs/fs.h>
19 #include <api/io.h>
20 #include <api/io_dir.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/zalloc.h>
24
25 /** Strings that correspond to enum hwmon_type. */
26 static const char * const hwmon_type_strs[HWMON_TYPE_MAX] = {
27 NULL,
28 "cpu",
29 "curr",
30 "energy",
31 "fan",
32 "humidity",
33 "in",
34 "intrusion",
35 "power",
36 "pwm",
37 "temp",
38 };
39 #define LONGEST_HWMON_TYPE_STR "intrusion"
40
41 /** Strings that correspond to enum hwmon_item. */
42 static const char * const hwmon_item_strs[HWMON_ITEM__MAX] = {
43 NULL,
44 "accuracy",
45 "alarm",
46 "auto_channels_temp",
47 "average",
48 "average_highest",
49 "average_interval",
50 "average_interval_max",
51 "average_interval_min",
52 "average_lowest",
53 "average_max",
54 "average_min",
55 "beep",
56 "cap",
57 "cap_hyst",
58 "cap_max",
59 "cap_min",
60 "crit",
61 "crit_hyst",
62 "div",
63 "emergency",
64 "emergency_hist",
65 "enable",
66 "fault",
67 "freq",
68 "highest",
69 "input",
70 "label",
71 "lcrit",
72 "lcrit_hyst",
73 "lowest",
74 "max",
75 "max_hyst",
76 "min",
77 "min_hyst",
78 "mod",
79 "offset",
80 "pulses",
81 "rated_max",
82 "rated_min",
83 "reset_history",
84 "target",
85 "type",
86 "vid",
87 };
88 #define LONGEST_HWMON_ITEM_STR "average_interval_max"
89
90 static const char *const hwmon_units[HWMON_TYPE_MAX] = {
91 NULL,
92 "V", /* cpu */
93 "A", /* curr */
94 "J", /* energy */
95 "rpm", /* fan */
96 "%", /* humidity */
97 "V", /* in */
98 "", /* intrusion */
99 "W", /* power */
100 "Hz", /* pwm */
101 "'C", /* temp */
102 };
103
104 struct hwmon_pmu {
105 struct perf_pmu pmu;
106 struct hashmap events;
107 int hwmon_dir_fd;
108 };
109
110 /**
111 * struct hwmon_pmu_event_value: Value in hwmon_pmu->events.
112 *
113 * Hwmon files are of the form <type><number>_<item> and may have a suffix
114 * _alarm.
115 */
116 struct hwmon_pmu_event_value {
117 /** @items: which item files are present. */
118 DECLARE_BITMAP(items, HWMON_ITEM__MAX);
119 /** @alarm_items: which item files are present. */
120 DECLARE_BITMAP(alarm_items, HWMON_ITEM__MAX);
121 /** @label: contents of <type><number>_label if present. */
122 char *label;
123 /** @name: name computed from label of the form <type>_<label>. */
124 char *name;
125 };
126
perf_pmu__is_hwmon(const struct perf_pmu * pmu)127 bool perf_pmu__is_hwmon(const struct perf_pmu *pmu)
128 {
129 return pmu && pmu->type >= PERF_PMU_TYPE_HWMON_START &&
130 pmu->type <= PERF_PMU_TYPE_HWMON_END;
131 }
132
evsel__is_hwmon(const struct evsel * evsel)133 bool evsel__is_hwmon(const struct evsel *evsel)
134 {
135 return perf_pmu__is_hwmon(evsel->pmu);
136 }
137
hwmon_pmu__event_hashmap_hash(long key,void * ctx __maybe_unused)138 static size_t hwmon_pmu__event_hashmap_hash(long key, void *ctx __maybe_unused)
139 {
140 return ((union hwmon_pmu_event_key)key).type_and_num;
141 }
142
hwmon_pmu__event_hashmap_equal(long key1,long key2,void * ctx __maybe_unused)143 static bool hwmon_pmu__event_hashmap_equal(long key1, long key2, void *ctx __maybe_unused)
144 {
145 return ((union hwmon_pmu_event_key)key1).type_and_num ==
146 ((union hwmon_pmu_event_key)key2).type_and_num;
147 }
148
hwmon_strcmp(const void * a,const void * b)149 static int hwmon_strcmp(const void *a, const void *b)
150 {
151 const char *sa = a;
152 const char * const *sb = b;
153
154 return strcmp(sa, *sb);
155 }
156
parse_hwmon_filename(const char * filename,enum hwmon_type * type,int * number,enum hwmon_item * item,bool * alarm)157 bool parse_hwmon_filename(const char *filename,
158 enum hwmon_type *type,
159 int *number,
160 enum hwmon_item *item,
161 bool *alarm)
162 {
163 char fn_type[24];
164 const char **elem;
165 const char *fn_item = NULL;
166 size_t fn_item_len;
167
168 assert(strlen(LONGEST_HWMON_TYPE_STR) < sizeof(fn_type));
169 strlcpy(fn_type, filename, sizeof(fn_type));
170 for (size_t i = 0; fn_type[i] != '\0'; i++) {
171 if (fn_type[i] >= '0' && fn_type[i] <= '9') {
172 fn_type[i] = '\0';
173 *number = strtoul(&filename[i], (char **)&fn_item, 10);
174 if (*fn_item == '_')
175 fn_item++;
176 break;
177 }
178 if (fn_type[i] == '_') {
179 fn_type[i] = '\0';
180 *number = -1;
181 fn_item = &filename[i + 1];
182 break;
183 }
184 }
185 if (fn_item == NULL || fn_type[0] == '\0' || (item != NULL && fn_item[0] == '\0')) {
186 pr_debug3("hwmon_pmu: not a hwmon file '%s'\n", filename);
187 return false;
188 }
189 elem = bsearch(&fn_type, hwmon_type_strs + 1, ARRAY_SIZE(hwmon_type_strs) - 1,
190 sizeof(hwmon_type_strs[0]), hwmon_strcmp);
191 if (!elem) {
192 pr_debug3("hwmon_pmu: not a hwmon type '%s' in file name '%s'\n",
193 fn_type, filename);
194 return false;
195 }
196
197 *type = elem - &hwmon_type_strs[0];
198 if (!item)
199 return true;
200
201 *alarm = false;
202 fn_item_len = strlen(fn_item);
203 if (fn_item_len > 6 && !strcmp(&fn_item[fn_item_len - 6], "_alarm")) {
204 assert(strlen(LONGEST_HWMON_ITEM_STR) < sizeof(fn_type));
205 strlcpy(fn_type, fn_item, fn_item_len - 5);
206 fn_item = fn_type;
207 *alarm = true;
208 }
209 elem = bsearch(fn_item, hwmon_item_strs + 1, ARRAY_SIZE(hwmon_item_strs) - 1,
210 sizeof(hwmon_item_strs[0]), hwmon_strcmp);
211 if (!elem) {
212 pr_debug3("hwmon_pmu: not a hwmon item '%s' in file name '%s'\n",
213 fn_item, filename);
214 return false;
215 }
216 *item = elem - &hwmon_item_strs[0];
217 return true;
218 }
219
fix_name(char * p)220 static void fix_name(char *p)
221 {
222 char *s = strchr(p, '\n');
223
224 if (s)
225 *s = '\0';
226
227 while (*p != '\0') {
228 if (strchr(" :,/\n\t", *p))
229 *p = '_';
230 else
231 *p = tolower(*p);
232 p++;
233 }
234 }
235
hwmon_pmu__read_events(struct hwmon_pmu * pmu)236 static int hwmon_pmu__read_events(struct hwmon_pmu *pmu)
237 {
238 int err = 0;
239 struct hashmap_entry *cur, *tmp;
240 size_t bkt;
241 struct io_dirent64 *ent;
242 struct io_dir dir;
243
244 if (pmu->pmu.sysfs_aliases_loaded)
245 return 0;
246
247 /* Use openat so that the directory contents are refreshed. */
248 io_dir__init(&dir, openat(pmu->hwmon_dir_fd, ".", O_CLOEXEC | O_DIRECTORY | O_RDONLY));
249
250 if (dir.dirfd < 0)
251 return -ENOENT;
252
253 while ((ent = io_dir__readdir(&dir)) != NULL) {
254 enum hwmon_type type;
255 int number;
256 enum hwmon_item item;
257 bool alarm;
258 union hwmon_pmu_event_key key = { .type_and_num = 0 };
259 struct hwmon_pmu_event_value *value;
260
261 if (ent->d_type != DT_REG)
262 continue;
263
264 if (!parse_hwmon_filename(ent->d_name, &type, &number, &item, &alarm)) {
265 pr_debug3("Not a hwmon file '%s'\n", ent->d_name);
266 continue;
267 }
268 key.num = number;
269 key.type = type;
270 if (!hashmap__find(&pmu->events, key.type_and_num, &value)) {
271 value = zalloc(sizeof(*value));
272 if (!value) {
273 err = -ENOMEM;
274 goto err_out;
275 }
276 err = hashmap__add(&pmu->events, key.type_and_num, value);
277 if (err) {
278 free(value);
279 err = -ENOMEM;
280 goto err_out;
281 }
282 }
283 __set_bit(item, alarm ? value->alarm_items : value->items);
284 if (item == HWMON_ITEM_LABEL) {
285 char buf[128];
286 int fd = openat(pmu->hwmon_dir_fd, ent->d_name, O_RDONLY);
287 ssize_t read_len;
288
289 if (fd < 0)
290 continue;
291
292 read_len = read(fd, buf, sizeof(buf));
293
294 while (read_len > 0 && buf[read_len - 1] == '\n')
295 read_len--;
296
297 if (read_len > 0)
298 buf[read_len] = '\0';
299
300 if (buf[0] == '\0') {
301 pr_debug("hwmon_pmu: empty label file %s %s\n",
302 pmu->pmu.name, ent->d_name);
303 close(fd);
304 continue;
305 }
306 value->label = strdup(buf);
307 if (!value->label) {
308 pr_debug("hwmon_pmu: memory allocation failure\n");
309 close(fd);
310 continue;
311 }
312 snprintf(buf, sizeof(buf), "%s_%s", hwmon_type_strs[type], value->label);
313 fix_name(buf);
314 value->name = strdup(buf);
315 if (!value->name)
316 pr_debug("hwmon_pmu: memory allocation failure\n");
317 close(fd);
318 }
319 }
320 if (hashmap__size(&pmu->events) == 0)
321 pr_debug2("hwmon_pmu: %s has no events\n", pmu->pmu.name);
322
323 hashmap__for_each_entry_safe((&pmu->events), cur, tmp, bkt) {
324 union hwmon_pmu_event_key key = {
325 .type_and_num = cur->key,
326 };
327 struct hwmon_pmu_event_value *value = cur->pvalue;
328
329 if (!test_bit(HWMON_ITEM_INPUT, value->items)) {
330 pr_debug("hwmon_pmu: %s removing event '%s%d' that has no input file\n",
331 pmu->pmu.name, hwmon_type_strs[key.type], key.num);
332 hashmap__delete(&pmu->events, key.type_and_num, &key, &value);
333 zfree(&value->label);
334 zfree(&value->name);
335 free(value);
336 }
337 }
338 pmu->pmu.sysfs_aliases_loaded = true;
339
340 err_out:
341 close(dir.dirfd);
342 return err;
343 }
344
hwmon_pmu__new(struct list_head * pmus,int hwmon_dir,const char * sysfs_name,const char * name)345 struct perf_pmu *hwmon_pmu__new(struct list_head *pmus, int hwmon_dir, const char *sysfs_name, const char *name)
346 {
347 char buf[32];
348 struct hwmon_pmu *hwm;
349
350 hwm = zalloc(sizeof(*hwm));
351 if (!hwm)
352 return NULL;
353
354 hwm->hwmon_dir_fd = hwmon_dir;
355 hwm->pmu.type = PERF_PMU_TYPE_HWMON_START + strtoul(sysfs_name + 5, NULL, 10);
356 if (hwm->pmu.type > PERF_PMU_TYPE_HWMON_END) {
357 pr_err("Unable to encode hwmon type from %s in valid PMU type\n", sysfs_name);
358 goto err_out;
359 }
360 snprintf(buf, sizeof(buf), "hwmon_%s", name);
361 fix_name(buf + 6);
362 hwm->pmu.name = strdup(buf);
363 if (!hwm->pmu.name)
364 goto err_out;
365 hwm->pmu.alias_name = strdup(sysfs_name);
366 if (!hwm->pmu.alias_name)
367 goto err_out;
368 hwm->pmu.cpus = perf_cpu_map__new("0");
369 if (!hwm->pmu.cpus)
370 goto err_out;
371 INIT_LIST_HEAD(&hwm->pmu.format);
372 INIT_LIST_HEAD(&hwm->pmu.aliases);
373 INIT_LIST_HEAD(&hwm->pmu.caps);
374 hashmap__init(&hwm->events, hwmon_pmu__event_hashmap_hash,
375 hwmon_pmu__event_hashmap_equal, /*ctx=*/NULL);
376
377 list_add_tail(&hwm->pmu.list, pmus);
378 return &hwm->pmu;
379 err_out:
380 free((char *)hwm->pmu.name);
381 free(hwm->pmu.alias_name);
382 free(hwm);
383 close(hwmon_dir);
384 return NULL;
385 }
386
hwmon_pmu__exit(struct perf_pmu * pmu)387 void hwmon_pmu__exit(struct perf_pmu *pmu)
388 {
389 struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
390 struct hashmap_entry *cur, *tmp;
391 size_t bkt;
392
393 hashmap__for_each_entry_safe((&hwm->events), cur, tmp, bkt) {
394 struct hwmon_pmu_event_value *value = cur->pvalue;
395
396 zfree(&value->label);
397 zfree(&value->name);
398 free(value);
399 }
400 hashmap__clear(&hwm->events);
401 close(hwm->hwmon_dir_fd);
402 }
403
hwmon_pmu__describe_items(struct hwmon_pmu * hwm,char * out_buf,size_t out_buf_len,union hwmon_pmu_event_key key,const unsigned long * items,bool is_alarm)404 static size_t hwmon_pmu__describe_items(struct hwmon_pmu *hwm, char *out_buf, size_t out_buf_len,
405 union hwmon_pmu_event_key key,
406 const unsigned long *items, bool is_alarm)
407 {
408 size_t bit;
409 char buf[64];
410 size_t len = 0;
411
412 for_each_set_bit(bit, items, HWMON_ITEM__MAX) {
413 int fd;
414
415 if (bit == HWMON_ITEM_LABEL || bit == HWMON_ITEM_INPUT)
416 continue;
417
418 snprintf(buf, sizeof(buf), "%s%d_%s%s",
419 hwmon_type_strs[key.type],
420 key.num,
421 hwmon_item_strs[bit],
422 is_alarm ? "_alarm" : "");
423 fd = openat(hwm->hwmon_dir_fd, buf, O_RDONLY);
424 if (fd > 0) {
425 ssize_t read_len = read(fd, buf, sizeof(buf));
426
427 while (read_len > 0 && buf[read_len - 1] == '\n')
428 read_len--;
429
430 if (read_len > 0) {
431 long long val;
432
433 buf[read_len] = '\0';
434 val = strtoll(buf, /*endptr=*/NULL, 10);
435 len += snprintf(out_buf + len, out_buf_len - len, "%s%s%s=%g%s",
436 len == 0 ? " " : ", ",
437 hwmon_item_strs[bit],
438 is_alarm ? "_alarm" : "",
439 (double)val / 1000.0,
440 hwmon_units[key.type]);
441 }
442 close(fd);
443 }
444 }
445 return len;
446 }
447
hwmon_pmu__for_each_event(struct perf_pmu * pmu,void * state,pmu_event_callback cb)448 int hwmon_pmu__for_each_event(struct perf_pmu *pmu, void *state, pmu_event_callback cb)
449 {
450 struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
451 struct hashmap_entry *cur;
452 size_t bkt;
453
454 if (hwmon_pmu__read_events(hwm))
455 return false;
456
457 hashmap__for_each_entry((&hwm->events), cur, bkt) {
458 static const char *const hwmon_scale_units[HWMON_TYPE_MAX] = {
459 NULL,
460 "0.001V", /* cpu */
461 "0.001A", /* curr */
462 "0.001J", /* energy */
463 "1rpm", /* fan */
464 "0.001%", /* humidity */
465 "0.001V", /* in */
466 NULL, /* intrusion */
467 "0.001W", /* power */
468 "1Hz", /* pwm */
469 "0.001'C", /* temp */
470 };
471 static const char *const hwmon_desc[HWMON_TYPE_MAX] = {
472 NULL,
473 "CPU core reference voltage", /* cpu */
474 "Current", /* curr */
475 "Cumulative energy use", /* energy */
476 "Fan", /* fan */
477 "Humidity", /* humidity */
478 "Voltage", /* in */
479 "Chassis intrusion detection", /* intrusion */
480 "Power use", /* power */
481 "Pulse width modulation fan control", /* pwm */
482 "Temperature", /* temp */
483 };
484 char alias_buf[64];
485 char desc_buf[256];
486 char encoding_buf[128];
487 union hwmon_pmu_event_key key = {
488 .type_and_num = cur->key,
489 };
490 struct hwmon_pmu_event_value *value = cur->pvalue;
491 struct pmu_event_info info = {
492 .pmu = pmu,
493 .name = value->name,
494 .alias = alias_buf,
495 .scale_unit = hwmon_scale_units[key.type],
496 .desc = desc_buf,
497 .long_desc = NULL,
498 .encoding_desc = encoding_buf,
499 .topic = "hwmon",
500 .pmu_name = pmu->name,
501 .event_type_desc = "Hwmon event",
502 };
503 int ret;
504 size_t len;
505
506 len = snprintf(alias_buf, sizeof(alias_buf), "%s%d",
507 hwmon_type_strs[key.type], key.num);
508 if (!info.name) {
509 info.name = info.alias;
510 info.alias = NULL;
511 }
512
513 len = snprintf(desc_buf, sizeof(desc_buf), "%s in unit %s named %s.",
514 hwmon_desc[key.type],
515 pmu->name + 6,
516 value->label ?: info.name);
517
518 len += hwmon_pmu__describe_items(hwm, desc_buf + len, sizeof(desc_buf) - len,
519 key, value->items, /*is_alarm=*/false);
520
521 len += hwmon_pmu__describe_items(hwm, desc_buf + len, sizeof(desc_buf) - len,
522 key, value->alarm_items, /*is_alarm=*/true);
523
524 snprintf(encoding_buf, sizeof(encoding_buf), "%s/config=0x%lx/",
525 pmu->name, cur->key);
526
527 ret = cb(state, &info);
528 if (ret)
529 return ret;
530 }
531 return 0;
532 }
533
hwmon_pmu__num_events(struct perf_pmu * pmu)534 size_t hwmon_pmu__num_events(struct perf_pmu *pmu)
535 {
536 struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
537
538 hwmon_pmu__read_events(hwm);
539 return hashmap__size(&hwm->events);
540 }
541
hwmon_pmu__have_event(struct perf_pmu * pmu,const char * name)542 bool hwmon_pmu__have_event(struct perf_pmu *pmu, const char *name)
543 {
544 struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
545 enum hwmon_type type;
546 int number;
547 union hwmon_pmu_event_key key = { .type_and_num = 0 };
548 struct hashmap_entry *cur;
549 size_t bkt;
550
551 if (!parse_hwmon_filename(name, &type, &number, /*item=*/NULL, /*is_alarm=*/NULL))
552 return false;
553
554 if (hwmon_pmu__read_events(hwm))
555 return false;
556
557 key.type = type;
558 key.num = number;
559 if (hashmap_find(&hwm->events, key.type_and_num, /*value=*/NULL))
560 return true;
561 if (key.num != -1)
562 return false;
563 /* Item is of form <type>_ which means we should match <type>_<label>. */
564 hashmap__for_each_entry((&hwm->events), cur, bkt) {
565 struct hwmon_pmu_event_value *value = cur->pvalue;
566
567 key.type_and_num = cur->key;
568 if (key.type == type && value->name && !strcasecmp(name, value->name))
569 return true;
570 }
571 return false;
572 }
573
hwmon_pmu__config_term(const struct hwmon_pmu * hwm,struct perf_event_attr * attr,struct parse_events_term * term,struct parse_events_error * err)574 static int hwmon_pmu__config_term(const struct hwmon_pmu *hwm,
575 struct perf_event_attr *attr,
576 struct parse_events_term *term,
577 struct parse_events_error *err)
578 {
579 if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER) {
580 enum hwmon_type type;
581 int number;
582
583 if (parse_hwmon_filename(term->config, &type, &number,
584 /*item=*/NULL, /*is_alarm=*/NULL)) {
585 if (number == -1) {
586 /*
587 * Item is of form <type>_ which means we should
588 * match <type>_<label>.
589 */
590 struct hashmap_entry *cur;
591 size_t bkt;
592
593 attr->config = 0;
594 hashmap__for_each_entry((&hwm->events), cur, bkt) {
595 union hwmon_pmu_event_key key = {
596 .type_and_num = cur->key,
597 };
598 struct hwmon_pmu_event_value *value = cur->pvalue;
599
600 if (key.type == type && value->name &&
601 !strcasecmp(term->config, value->name)) {
602 attr->config = key.type_and_num;
603 break;
604 }
605 }
606 if (attr->config == 0)
607 return -EINVAL;
608 } else {
609 union hwmon_pmu_event_key key = {
610 .type_and_num = 0,
611 };
612
613 key.type = type;
614 key.num = number;
615 attr->config = key.type_and_num;
616 }
617 return 0;
618 }
619 }
620 if (err) {
621 char *err_str;
622
623 parse_events_error__handle(err, term->err_val,
624 asprintf(&err_str,
625 "unexpected hwmon event term (%s) %s",
626 parse_events__term_type_str(term->type_term),
627 term->config) < 0
628 ? strdup("unexpected hwmon event term")
629 : err_str,
630 NULL);
631 }
632 return -EINVAL;
633 }
634
hwmon_pmu__config_terms(const struct perf_pmu * pmu,struct perf_event_attr * attr,struct parse_events_terms * terms,struct parse_events_error * err)635 int hwmon_pmu__config_terms(const struct perf_pmu *pmu,
636 struct perf_event_attr *attr,
637 struct parse_events_terms *terms,
638 struct parse_events_error *err)
639 {
640 struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
641 struct parse_events_term *term;
642 int ret;
643
644 ret = hwmon_pmu__read_events(hwm);
645 if (ret)
646 return ret;
647
648 list_for_each_entry(term, &terms->terms, list) {
649 if (hwmon_pmu__config_term(hwm, attr, term, err))
650 return -EINVAL;
651 }
652
653 return 0;
654
655 }
656
hwmon_pmu__check_alias(struct parse_events_terms * terms,struct perf_pmu_info * info,struct parse_events_error * err)657 int hwmon_pmu__check_alias(struct parse_events_terms *terms, struct perf_pmu_info *info,
658 struct parse_events_error *err)
659 {
660 struct parse_events_term *term =
661 list_first_entry(&terms->terms, struct parse_events_term, list);
662
663 if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER) {
664 enum hwmon_type type;
665 int number;
666
667 if (parse_hwmon_filename(term->config, &type, &number,
668 /*item=*/NULL, /*is_alarm=*/NULL)) {
669 info->unit = hwmon_units[type];
670 if (type == HWMON_TYPE_FAN || type == HWMON_TYPE_PWM ||
671 type == HWMON_TYPE_INTRUSION)
672 info->scale = 1;
673 else
674 info->scale = 0.001;
675 }
676 return 0;
677 }
678 if (err) {
679 char *err_str;
680
681 parse_events_error__handle(err, term->err_val,
682 asprintf(&err_str,
683 "unexpected hwmon event term (%s) %s",
684 parse_events__term_type_str(term->type_term),
685 term->config) < 0
686 ? strdup("unexpected hwmon event term")
687 : err_str,
688 NULL);
689 }
690 return -EINVAL;
691 }
692
perf_pmus__read_hwmon_pmus(struct list_head * pmus)693 int perf_pmus__read_hwmon_pmus(struct list_head *pmus)
694 {
695 char *line = NULL;
696 struct io_dirent64 *class_hwmon_ent;
697 struct io_dir class_hwmon_dir;
698 char buf[PATH_MAX];
699 const char *sysfs = sysfs__mountpoint();
700
701 if (!sysfs)
702 return 0;
703
704 scnprintf(buf, sizeof(buf), "%s/class/hwmon/", sysfs);
705 io_dir__init(&class_hwmon_dir, open(buf, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
706
707 if (class_hwmon_dir.dirfd < 0)
708 return 0;
709
710 while ((class_hwmon_ent = io_dir__readdir(&class_hwmon_dir)) != NULL) {
711 size_t line_len;
712 int hwmon_dir, name_fd;
713 struct io io;
714
715 if (class_hwmon_ent->d_type != DT_LNK)
716 continue;
717
718 scnprintf(buf, sizeof(buf), "%s/class/hwmon/%s", sysfs, class_hwmon_ent->d_name);
719 hwmon_dir = open(buf, O_DIRECTORY);
720 if (hwmon_dir == -1) {
721 pr_debug("hwmon_pmu: not a directory: '%s/class/hwmon/%s'\n",
722 sysfs, class_hwmon_ent->d_name);
723 continue;
724 }
725 name_fd = openat(hwmon_dir, "name", O_RDONLY);
726 if (name_fd == -1) {
727 pr_debug("hwmon_pmu: failure to open '%s/class/hwmon/%s/name'\n",
728 sysfs, class_hwmon_ent->d_name);
729 close(hwmon_dir);
730 continue;
731 }
732 io__init(&io, name_fd, buf, sizeof(buf));
733 io__getline(&io, &line, &line_len);
734 if (line_len > 0 && line[line_len - 1] == '\n')
735 line[line_len - 1] = '\0';
736 hwmon_pmu__new(pmus, hwmon_dir, class_hwmon_ent->d_name, line);
737 close(name_fd);
738 }
739 free(line);
740 close(class_hwmon_dir.dirfd);
741 return 0;
742 }
743
744 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
745
evsel__hwmon_pmu_open(struct evsel * evsel,struct perf_thread_map * threads,int start_cpu_map_idx,int end_cpu_map_idx)746 int evsel__hwmon_pmu_open(struct evsel *evsel,
747 struct perf_thread_map *threads,
748 int start_cpu_map_idx, int end_cpu_map_idx)
749 {
750 struct hwmon_pmu *hwm = container_of(evsel->pmu, struct hwmon_pmu, pmu);
751 union hwmon_pmu_event_key key = {
752 .type_and_num = evsel->core.attr.config,
753 };
754 int idx = 0, thread = 0, nthreads, err = 0;
755
756 nthreads = perf_thread_map__nr(threads);
757 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
758 for (thread = 0; thread < nthreads; thread++) {
759 char buf[64];
760 int fd;
761
762 snprintf(buf, sizeof(buf), "%s%d_input",
763 hwmon_type_strs[key.type], key.num);
764
765 fd = openat(hwm->hwmon_dir_fd, buf, O_RDONLY);
766 FD(evsel, idx, thread) = fd;
767 if (fd < 0) {
768 err = -errno;
769 goto out_close;
770 }
771 }
772 }
773 return 0;
774 out_close:
775 if (err)
776 threads->err_thread = thread;
777
778 do {
779 while (--thread >= 0) {
780 if (FD(evsel, idx, thread) >= 0)
781 close(FD(evsel, idx, thread));
782 FD(evsel, idx, thread) = -1;
783 }
784 thread = nthreads;
785 } while (--idx >= 0);
786 return err;
787 }
788
evsel__hwmon_pmu_read(struct evsel * evsel,int cpu_map_idx,int thread)789 int evsel__hwmon_pmu_read(struct evsel *evsel, int cpu_map_idx, int thread)
790 {
791 char buf[32];
792 int fd;
793 ssize_t len;
794 struct perf_counts_values *count, *old_count = NULL;
795
796 if (evsel->prev_raw_counts)
797 old_count = perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
798
799 count = perf_counts(evsel->counts, cpu_map_idx, thread);
800 fd = FD(evsel, cpu_map_idx, thread);
801 len = pread(fd, buf, sizeof(buf), 0);
802 if (len <= 0) {
803 count->lost++;
804 return -EINVAL;
805 }
806 buf[len] = '\0';
807 if (old_count) {
808 count->val = old_count->val + strtoll(buf, NULL, 10);
809 count->run = old_count->run + 1;
810 count->ena = old_count->ena + 1;
811 } else {
812 count->val = strtoll(buf, NULL, 10);
813 count->run++;
814 count->ena++;
815 }
816 return 0;
817 }
818