Commit | Line | Data |
---|---|---|
1aed2671 | 1 | #include "../perf.h" |
4cf40131 | 2 | #include "util.h" |
84f5d36f | 3 | #include "debug.h" |
cd0cfad7 | 4 | #include <api/fs/fs.h> |
69e3f52d | 5 | #include <sys/mman.h> |
89fe808a | 6 | #ifdef HAVE_BACKTRACE_SUPPORT |
dc4552bf | 7 | #include <execinfo.h> |
c9f08bee | 8 | #endif |
dc4552bf ACM |
9 | #include <stdio.h> |
10 | #include <stdlib.h> | |
cef82c9f JO |
11 | #include <string.h> |
12 | #include <errno.h> | |
1a47245d | 13 | #include <limits.h> |
71db07b1 | 14 | #include <byteswap.h> |
838d1452 | 15 | #include <linux/kernel.h> |
4cf40131 | 16 | |
1aed2671 JR |
17 | /* |
18 | * XXX We need to find a better place for these things... | |
19 | */ | |
0c1fe6b2 | 20 | unsigned int page_size; |
2b1b7100 | 21 | int cacheline_size; |
0c1fe6b2 | 22 | |
0c6332e9 ACM |
23 | bool test_attr__enabled; |
24 | ||
1aed2671 | 25 | bool perf_host = true; |
c4a7dca9 | 26 | bool perf_guest = false; |
1aed2671 | 27 | |
1355915a BP |
28 | char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events"; |
29 | ||
1aed2671 JR |
30 | void event_attr_init(struct perf_event_attr *attr) |
31 | { | |
32 | if (!perf_host) | |
33 | attr->exclude_host = 1; | |
34 | if (!perf_guest) | |
35 | attr->exclude_guest = 1; | |
7e1ccd38 SE |
36 | /* to capture ABI version */ |
37 | attr->size = sizeof(*attr); | |
1aed2671 JR |
38 | } |
39 | ||
4cf40131 ACM |
40 | int mkdir_p(char *path, mode_t mode) |
41 | { | |
42 | struct stat st; | |
43 | int err; | |
44 | char *d = path; | |
45 | ||
46 | if (*d != '/') | |
47 | return -1; | |
48 | ||
49 | if (stat(path, &st) == 0) | |
50 | return 0; | |
51 | ||
52 | while (*++d == '/'); | |
53 | ||
54 | while ((d = strchr(d, '/'))) { | |
55 | *d = '\0'; | |
56 | err = stat(path, &st) && mkdir(path, mode); | |
57 | *d++ = '/'; | |
58 | if (err) | |
59 | return -1; | |
60 | while (*d == '/') | |
61 | ++d; | |
62 | } | |
63 | return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; | |
64 | } | |
65 | ||
9a17d726 | 66 | static int slow_copyfile(const char *from, const char *to, mode_t mode) |
9e201442 | 67 | { |
9a17d726 | 68 | int err = -1; |
9e201442 ACM |
69 | char *line = NULL; |
70 | size_t n; | |
71 | FILE *from_fp = fopen(from, "r"), *to_fp; | |
9a17d726 | 72 | mode_t old_umask; |
9e201442 ACM |
73 | |
74 | if (from_fp == NULL) | |
75 | goto out; | |
76 | ||
9a17d726 | 77 | old_umask = umask(mode ^ 0777); |
9e201442 | 78 | to_fp = fopen(to, "w"); |
9a17d726 | 79 | umask(old_umask); |
9e201442 ACM |
80 | if (to_fp == NULL) |
81 | goto out_fclose_from; | |
82 | ||
83 | while (getline(&line, &n, from_fp) > 0) | |
84 | if (fputs(line, to_fp) == EOF) | |
85 | goto out_fclose_to; | |
86 | err = 0; | |
87 | out_fclose_to: | |
88 | fclose(to_fp); | |
89 | free(line); | |
90 | out_fclose_from: | |
91 | fclose(from_fp); | |
92 | out: | |
93 | return err; | |
94 | } | |
95 | ||
9a17d726 | 96 | int copyfile_mode(const char *from, const char *to, mode_t mode) |
4cf40131 ACM |
97 | { |
98 | int fromfd, tofd; | |
99 | struct stat st; | |
100 | void *addr; | |
101 | int err = -1; | |
102 | ||
103 | if (stat(from, &st)) | |
104 | goto out; | |
105 | ||
9e201442 | 106 | if (st.st_size == 0) /* /proc? do it slowly... */ |
9a17d726 | 107 | return slow_copyfile(from, to, mode); |
9e201442 | 108 | |
4cf40131 ACM |
109 | fromfd = open(from, O_RDONLY); |
110 | if (fromfd < 0) | |
111 | goto out; | |
112 | ||
9a17d726 | 113 | tofd = creat(to, mode); |
4cf40131 ACM |
114 | if (tofd < 0) |
115 | goto out_close_from; | |
116 | ||
117 | addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0); | |
118 | if (addr == MAP_FAILED) | |
119 | goto out_close_to; | |
120 | ||
121 | if (write(tofd, addr, st.st_size) == st.st_size) | |
122 | err = 0; | |
123 | ||
124 | munmap(addr, st.st_size); | |
125 | out_close_to: | |
126 | close(tofd); | |
127 | if (err) | |
128 | unlink(to); | |
129 | out_close_from: | |
130 | close(fromfd); | |
131 | out: | |
132 | return err; | |
133 | } | |
c82ee828 | 134 | |
9a17d726 AH |
135 | int copyfile(const char *from, const char *to) |
136 | { | |
137 | return copyfile_mode(from, to, 0755); | |
138 | } | |
139 | ||
c82ee828 ACM |
140 | unsigned long convert_unit(unsigned long value, char *unit) |
141 | { | |
142 | *unit = ' '; | |
143 | ||
144 | if (value > 1000) { | |
145 | value /= 1000; | |
146 | *unit = 'K'; | |
147 | } | |
148 | ||
149 | if (value > 1000) { | |
150 | value /= 1000; | |
151 | *unit = 'M'; | |
152 | } | |
153 | ||
154 | if (value > 1000) { | |
155 | value /= 1000; | |
156 | *unit = 'G'; | |
157 | } | |
158 | ||
159 | return value; | |
160 | } | |
1e7972cc | 161 | |
bc3a502b | 162 | static ssize_t ion(bool is_read, int fd, void *buf, size_t n) |
1e7972cc ACM |
163 | { |
164 | void *buf_start = buf; | |
838d1452 | 165 | size_t left = n; |
1e7972cc | 166 | |
838d1452 | 167 | while (left) { |
bc3a502b JO |
168 | ssize_t ret = is_read ? read(fd, buf, left) : |
169 | write(fd, buf, left); | |
1e7972cc | 170 | |
e148c760 NK |
171 | if (ret < 0 && errno == EINTR) |
172 | continue; | |
1e7972cc ACM |
173 | if (ret <= 0) |
174 | return ret; | |
175 | ||
838d1452 JO |
176 | left -= ret; |
177 | buf += ret; | |
1e7972cc ACM |
178 | } |
179 | ||
838d1452 JO |
180 | BUG_ON((size_t)(buf - buf_start) != n); |
181 | return n; | |
1e7972cc | 182 | } |
61e04b33 | 183 | |
bc3a502b JO |
184 | /* |
185 | * Read exactly 'n' bytes or return an error. | |
186 | */ | |
187 | ssize_t readn(int fd, void *buf, size_t n) | |
188 | { | |
189 | return ion(true, fd, buf, n); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Write exactly 'n' bytes or return an error. | |
194 | */ | |
195 | ssize_t writen(int fd, void *buf, size_t n) | |
196 | { | |
197 | return ion(false, fd, buf, n); | |
198 | } | |
199 | ||
61e04b33 ACM |
200 | size_t hex_width(u64 v) |
201 | { | |
202 | size_t n = 1; | |
203 | ||
204 | while ((v >>= 4)) | |
205 | ++n; | |
206 | ||
207 | return n; | |
208 | } | |
dc4552bf | 209 | |
b2aff5f6 JO |
210 | static int hex(char ch) |
211 | { | |
212 | if ((ch >= '0') && (ch <= '9')) | |
213 | return ch - '0'; | |
214 | if ((ch >= 'a') && (ch <= 'f')) | |
215 | return ch - 'a' + 10; | |
216 | if ((ch >= 'A') && (ch <= 'F')) | |
217 | return ch - 'A' + 10; | |
218 | return -1; | |
219 | } | |
220 | ||
221 | /* | |
222 | * While we find nice hex chars, build a long_val. | |
223 | * Return number of chars processed. | |
224 | */ | |
225 | int hex2u64(const char *ptr, u64 *long_val) | |
226 | { | |
227 | const char *p = ptr; | |
228 | *long_val = 0; | |
229 | ||
230 | while (*p) { | |
231 | const int hex_val = hex(*p); | |
232 | ||
233 | if (hex_val < 0) | |
234 | break; | |
235 | ||
236 | *long_val = (*long_val << 4) | hex_val; | |
237 | p++; | |
238 | } | |
239 | ||
240 | return p - ptr; | |
241 | } | |
242 | ||
dc4552bf | 243 | /* Obtain a backtrace and print it to stdout. */ |
89fe808a | 244 | #ifdef HAVE_BACKTRACE_SUPPORT |
dc4552bf ACM |
245 | void dump_stack(void) |
246 | { | |
247 | void *array[16]; | |
248 | size_t size = backtrace(array, ARRAY_SIZE(array)); | |
249 | char **strings = backtrace_symbols(array, size); | |
250 | size_t i; | |
251 | ||
252 | printf("Obtained %zd stack frames.\n", size); | |
253 | ||
254 | for (i = 0; i < size; i++) | |
255 | printf("%s\n", strings[i]); | |
256 | ||
257 | free(strings); | |
258 | } | |
c9f08bee IT |
259 | #else |
260 | void dump_stack(void) {} | |
261 | #endif | |
2c803e52 DA |
262 | |
263 | void get_term_dimensions(struct winsize *ws) | |
264 | { | |
265 | char *s = getenv("LINES"); | |
266 | ||
267 | if (s != NULL) { | |
268 | ws->ws_row = atoi(s); | |
269 | s = getenv("COLUMNS"); | |
270 | if (s != NULL) { | |
271 | ws->ws_col = atoi(s); | |
272 | if (ws->ws_row && ws->ws_col) | |
273 | return; | |
274 | } | |
275 | } | |
276 | #ifdef TIOCGWINSZ | |
277 | if (ioctl(1, TIOCGWINSZ, ws) == 0 && | |
278 | ws->ws_row && ws->ws_col) | |
279 | return; | |
280 | #endif | |
281 | ws->ws_row = 25; | |
282 | ws->ws_col = 80; | |
283 | } | |
1355915a BP |
284 | |
285 | static void set_tracing_events_path(const char *mountpoint) | |
286 | { | |
287 | snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s", | |
288 | mountpoint, "tracing/events"); | |
289 | } | |
290 | ||
291 | const char *perf_debugfs_mount(const char *mountpoint) | |
292 | { | |
293 | const char *mnt; | |
294 | ||
295 | mnt = debugfs_mount(mountpoint); | |
296 | if (!mnt) | |
297 | return NULL; | |
298 | ||
299 | set_tracing_events_path(mnt); | |
300 | ||
301 | return mnt; | |
302 | } | |
303 | ||
304 | void perf_debugfs_set_path(const char *mntpt) | |
305 | { | |
306 | snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt); | |
307 | set_tracing_events_path(mntpt); | |
308 | } | |
167aedc4 NK |
309 | |
310 | static const char *find_debugfs(void) | |
311 | { | |
312 | const char *path = perf_debugfs_mount(NULL); | |
313 | ||
314 | if (!path) | |
315 | fprintf(stderr, "Your kernel does not support the debugfs filesystem"); | |
316 | ||
317 | return path; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Finds the path to the debugfs/tracing | |
322 | * Allocates the string and stores it. | |
323 | */ | |
324 | const char *find_tracing_dir(void) | |
325 | { | |
326 | static char *tracing; | |
327 | static int tracing_found; | |
328 | const char *debugfs; | |
329 | ||
330 | if (tracing_found) | |
331 | return tracing; | |
332 | ||
333 | debugfs = find_debugfs(); | |
334 | if (!debugfs) | |
335 | return NULL; | |
336 | ||
d400a68d | 337 | if (asprintf(&tracing, "%s/tracing", debugfs) < 0) |
167aedc4 NK |
338 | return NULL; |
339 | ||
167aedc4 NK |
340 | tracing_found = 1; |
341 | return tracing; | |
342 | } | |
343 | ||
344 | char *get_tracing_file(const char *name) | |
345 | { | |
346 | const char *tracing; | |
347 | char *file; | |
348 | ||
349 | tracing = find_tracing_dir(); | |
350 | if (!tracing) | |
351 | return NULL; | |
352 | ||
d400a68d | 353 | if (asprintf(&file, "%s/%s", tracing, name) < 0) |
167aedc4 NK |
354 | return NULL; |
355 | ||
167aedc4 NK |
356 | return file; |
357 | } | |
358 | ||
359 | void put_tracing_file(char *file) | |
360 | { | |
361 | free(file); | |
362 | } | |
3b47abe1 NK |
363 | |
364 | int parse_nsec_time(const char *str, u64 *ptime) | |
365 | { | |
366 | u64 time_sec, time_nsec; | |
367 | char *end; | |
368 | ||
369 | time_sec = strtoul(str, &end, 10); | |
370 | if (*end != '.' && *end != '\0') | |
371 | return -1; | |
372 | ||
373 | if (*end == '.') { | |
374 | int i; | |
375 | char nsec_buf[10]; | |
376 | ||
377 | if (strlen(++end) > 9) | |
378 | return -1; | |
379 | ||
380 | strncpy(nsec_buf, end, 9); | |
381 | nsec_buf[9] = '\0'; | |
382 | ||
383 | /* make it nsec precision */ | |
384 | for (i = strlen(nsec_buf); i < 9; i++) | |
385 | nsec_buf[i] = '0'; | |
386 | ||
387 | time_nsec = strtoul(nsec_buf, &end, 10); | |
388 | if (*end != '\0') | |
389 | return -1; | |
390 | } else | |
391 | time_nsec = 0; | |
392 | ||
393 | *ptime = time_sec * NSEC_PER_SEC + time_nsec; | |
394 | return 0; | |
395 | } | |
27050f53 JO |
396 | |
397 | unsigned long parse_tag_value(const char *str, struct parse_tag *tags) | |
398 | { | |
399 | struct parse_tag *i = tags; | |
400 | ||
401 | while (i->tag) { | |
402 | char *s; | |
403 | ||
404 | s = strchr(str, i->tag); | |
405 | if (s) { | |
406 | unsigned long int value; | |
407 | char *endptr; | |
408 | ||
409 | value = strtoul(str, &endptr, 10); | |
410 | if (s != endptr) | |
411 | break; | |
412 | ||
56921bec AH |
413 | if (value > ULONG_MAX / i->mult) |
414 | break; | |
27050f53 JO |
415 | value *= i->mult; |
416 | return value; | |
417 | } | |
418 | i++; | |
419 | } | |
420 | ||
421 | return (unsigned long) -1; | |
422 | } | |
97a07f10 ACM |
423 | |
424 | int filename__read_int(const char *filename, int *value) | |
425 | { | |
426 | char line[64]; | |
427 | int fd = open(filename, O_RDONLY), err = -1; | |
428 | ||
429 | if (fd < 0) | |
430 | return -1; | |
431 | ||
432 | if (read(fd, line, sizeof(line)) > 0) { | |
433 | *value = atoi(line); | |
434 | err = 0; | |
435 | } | |
436 | ||
437 | close(fd); | |
438 | return err; | |
439 | } | |
cef82c9f JO |
440 | |
441 | int filename__read_str(const char *filename, char **buf, size_t *sizep) | |
442 | { | |
443 | size_t size = 0, alloc_size = 0; | |
444 | void *bf = NULL, *nbf; | |
445 | int fd, n, err = 0; | |
446 | ||
447 | fd = open(filename, O_RDONLY); | |
448 | if (fd < 0) | |
449 | return -errno; | |
450 | ||
451 | do { | |
452 | if (size == alloc_size) { | |
453 | alloc_size += BUFSIZ; | |
454 | nbf = realloc(bf, alloc_size); | |
455 | if (!nbf) { | |
456 | err = -ENOMEM; | |
457 | break; | |
458 | } | |
459 | ||
460 | bf = nbf; | |
461 | } | |
462 | ||
463 | n = read(fd, bf + size, alloc_size - size); | |
464 | if (n < 0) { | |
465 | if (size) { | |
466 | pr_warning("read failed %d: %s\n", | |
467 | errno, strerror(errno)); | |
468 | err = 0; | |
469 | } else | |
470 | err = -errno; | |
471 | ||
472 | break; | |
473 | } | |
474 | ||
475 | size += n; | |
476 | } while (n > 0); | |
477 | ||
478 | if (!err) { | |
479 | *sizep = size; | |
480 | *buf = bf; | |
481 | } else | |
482 | free(bf); | |
483 | ||
484 | close(fd); | |
485 | return err; | |
486 | } | |
e1a2b174 DY |
487 | |
488 | const char *get_filename_for_perf_kvm(void) | |
489 | { | |
490 | const char *filename; | |
491 | ||
492 | if (perf_host && !perf_guest) | |
493 | filename = strdup("perf.data.host"); | |
494 | else if (!perf_host && perf_guest) | |
495 | filename = strdup("perf.data.guest"); | |
496 | else | |
497 | filename = strdup("perf.data.kvm"); | |
498 | ||
499 | return filename; | |
500 | } | |
1a47245d AH |
501 | |
502 | int perf_event_paranoid(void) | |
503 | { | |
504 | char path[PATH_MAX]; | |
505 | const char *procfs = procfs__mountpoint(); | |
506 | int value; | |
507 | ||
508 | if (!procfs) | |
509 | return INT_MAX; | |
510 | ||
511 | scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs); | |
512 | ||
513 | if (filename__read_int(path, &value)) | |
514 | return INT_MAX; | |
515 | ||
516 | return value; | |
517 | } | |
71db07b1 AH |
518 | |
519 | void mem_bswap_32(void *src, int byte_size) | |
520 | { | |
521 | u32 *m = src; | |
522 | while (byte_size > 0) { | |
523 | *m = bswap_32(*m); | |
524 | byte_size -= sizeof(u32); | |
525 | ++m; | |
526 | } | |
527 | } | |
528 | ||
529 | void mem_bswap_64(void *src, int byte_size) | |
530 | { | |
531 | u64 *m = src; | |
532 | ||
533 | while (byte_size > 0) { | |
534 | *m = bswap_64(*m); | |
535 | byte_size -= sizeof(u64); | |
536 | ++m; | |
537 | } | |
538 | } |