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1#include "../perf.h"
2#include "util.h"
3#include <api/fs/fs.h>
4#include <sys/mman.h>
5#ifdef HAVE_BACKTRACE_SUPPORT
6#include <execinfo.h>
7#endif
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11#include <errno.h>
12#include <limits.h>
13#include <byteswap.h>
14#include <linux/kernel.h>
15
16/*
17 * XXX We need to find a better place for these things...
18 */
19unsigned int page_size;
20
21bool test_attr__enabled;
22
23bool perf_host = true;
24bool perf_guest = false;
25
26char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
27
28void event_attr_init(struct perf_event_attr *attr)
29{
30 if (!perf_host)
31 attr->exclude_host = 1;
32 if (!perf_guest)
33 attr->exclude_guest = 1;
34 /* to capture ABI version */
35 attr->size = sizeof(*attr);
36}
37
38int mkdir_p(char *path, mode_t mode)
39{
40 struct stat st;
41 int err;
42 char *d = path;
43
44 if (*d != '/')
45 return -1;
46
47 if (stat(path, &st) == 0)
48 return 0;
49
50 while (*++d == '/');
51
52 while ((d = strchr(d, '/'))) {
53 *d = '\0';
54 err = stat(path, &st) && mkdir(path, mode);
55 *d++ = '/';
56 if (err)
57 return -1;
58 while (*d == '/')
59 ++d;
60 }
61 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
62}
63
64static int slow_copyfile(const char *from, const char *to, mode_t mode)
65{
66 int err = -1;
67 char *line = NULL;
68 size_t n;
69 FILE *from_fp = fopen(from, "r"), *to_fp;
70 mode_t old_umask;
71
72 if (from_fp == NULL)
73 goto out;
74
75 old_umask = umask(mode ^ 0777);
76 to_fp = fopen(to, "w");
77 umask(old_umask);
78 if (to_fp == NULL)
79 goto out_fclose_from;
80
81 while (getline(&line, &n, from_fp) > 0)
82 if (fputs(line, to_fp) == EOF)
83 goto out_fclose_to;
84 err = 0;
85out_fclose_to:
86 fclose(to_fp);
87 free(line);
88out_fclose_from:
89 fclose(from_fp);
90out:
91 return err;
92}
93
94int copyfile_mode(const char *from, const char *to, mode_t mode)
95{
96 int fromfd, tofd;
97 struct stat st;
98 void *addr;
99 int err = -1;
100
101 if (stat(from, &st))
102 goto out;
103
104 if (st.st_size == 0) /* /proc? do it slowly... */
105 return slow_copyfile(from, to, mode);
106
107 fromfd = open(from, O_RDONLY);
108 if (fromfd < 0)
109 goto out;
110
111 tofd = creat(to, mode);
112 if (tofd < 0)
113 goto out_close_from;
114
115 addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
116 if (addr == MAP_FAILED)
117 goto out_close_to;
118
119 if (write(tofd, addr, st.st_size) == st.st_size)
120 err = 0;
121
122 munmap(addr, st.st_size);
123out_close_to:
124 close(tofd);
125 if (err)
126 unlink(to);
127out_close_from:
128 close(fromfd);
129out:
130 return err;
131}
132
133int copyfile(const char *from, const char *to)
134{
135 return copyfile_mode(from, to, 0755);
136}
137
138unsigned long convert_unit(unsigned long value, char *unit)
139{
140 *unit = ' ';
141
142 if (value > 1000) {
143 value /= 1000;
144 *unit = 'K';
145 }
146
147 if (value > 1000) {
148 value /= 1000;
149 *unit = 'M';
150 }
151
152 if (value > 1000) {
153 value /= 1000;
154 *unit = 'G';
155 }
156
157 return value;
158}
159
160static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
161{
162 void *buf_start = buf;
163 size_t left = n;
164
165 while (left) {
166 ssize_t ret = is_read ? read(fd, buf, left) :
167 write(fd, buf, left);
168
169 if (ret <= 0)
170 return ret;
171
172 left -= ret;
173 buf += ret;
174 }
175
176 BUG_ON((size_t)(buf - buf_start) != n);
177 return n;
178}
179
180/*
181 * Read exactly 'n' bytes or return an error.
182 */
183ssize_t readn(int fd, void *buf, size_t n)
184{
185 return ion(true, fd, buf, n);
186}
187
188/*
189 * Write exactly 'n' bytes or return an error.
190 */
191ssize_t writen(int fd, void *buf, size_t n)
192{
193 return ion(false, fd, buf, n);
194}
195
196size_t hex_width(u64 v)
197{
198 size_t n = 1;
199
200 while ((v >>= 4))
201 ++n;
202
203 return n;
204}
205
206static int hex(char ch)
207{
208 if ((ch >= '0') && (ch <= '9'))
209 return ch - '0';
210 if ((ch >= 'a') && (ch <= 'f'))
211 return ch - 'a' + 10;
212 if ((ch >= 'A') && (ch <= 'F'))
213 return ch - 'A' + 10;
214 return -1;
215}
216
217/*
218 * While we find nice hex chars, build a long_val.
219 * Return number of chars processed.
220 */
221int hex2u64(const char *ptr, u64 *long_val)
222{
223 const char *p = ptr;
224 *long_val = 0;
225
226 while (*p) {
227 const int hex_val = hex(*p);
228
229 if (hex_val < 0)
230 break;
231
232 *long_val = (*long_val << 4) | hex_val;
233 p++;
234 }
235
236 return p - ptr;
237}
238
239/* Obtain a backtrace and print it to stdout. */
240#ifdef HAVE_BACKTRACE_SUPPORT
241void dump_stack(void)
242{
243 void *array[16];
244 size_t size = backtrace(array, ARRAY_SIZE(array));
245 char **strings = backtrace_symbols(array, size);
246 size_t i;
247
248 printf("Obtained %zd stack frames.\n", size);
249
250 for (i = 0; i < size; i++)
251 printf("%s\n", strings[i]);
252
253 free(strings);
254}
255#else
256void dump_stack(void) {}
257#endif
258
259void get_term_dimensions(struct winsize *ws)
260{
261 char *s = getenv("LINES");
262
263 if (s != NULL) {
264 ws->ws_row = atoi(s);
265 s = getenv("COLUMNS");
266 if (s != NULL) {
267 ws->ws_col = atoi(s);
268 if (ws->ws_row && ws->ws_col)
269 return;
270 }
271 }
272#ifdef TIOCGWINSZ
273 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
274 ws->ws_row && ws->ws_col)
275 return;
276#endif
277 ws->ws_row = 25;
278 ws->ws_col = 80;
279}
280
281static void set_tracing_events_path(const char *mountpoint)
282{
283 snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s",
284 mountpoint, "tracing/events");
285}
286
287const char *perf_debugfs_mount(const char *mountpoint)
288{
289 const char *mnt;
290
291 mnt = debugfs_mount(mountpoint);
292 if (!mnt)
293 return NULL;
294
295 set_tracing_events_path(mnt);
296
297 return mnt;
298}
299
300void perf_debugfs_set_path(const char *mntpt)
301{
302 snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
303 set_tracing_events_path(mntpt);
304}
305
306static const char *find_debugfs(void)
307{
308 const char *path = perf_debugfs_mount(NULL);
309
310 if (!path)
311 fprintf(stderr, "Your kernel does not support the debugfs filesystem");
312
313 return path;
314}
315
316/*
317 * Finds the path to the debugfs/tracing
318 * Allocates the string and stores it.
319 */
320const char *find_tracing_dir(void)
321{
322 static char *tracing;
323 static int tracing_found;
324 const char *debugfs;
325
326 if (tracing_found)
327 return tracing;
328
329 debugfs = find_debugfs();
330 if (!debugfs)
331 return NULL;
332
333 tracing = malloc(strlen(debugfs) + 9);
334 if (!tracing)
335 return NULL;
336
337 sprintf(tracing, "%s/tracing", debugfs);
338
339 tracing_found = 1;
340 return tracing;
341}
342
343char *get_tracing_file(const char *name)
344{
345 const char *tracing;
346 char *file;
347
348 tracing = find_tracing_dir();
349 if (!tracing)
350 return NULL;
351
352 file = malloc(strlen(tracing) + strlen(name) + 2);
353 if (!file)
354 return NULL;
355
356 sprintf(file, "%s/%s", tracing, name);
357 return file;
358}
359
360void put_tracing_file(char *file)
361{
362 free(file);
363}
364
365int parse_nsec_time(const char *str, u64 *ptime)
366{
367 u64 time_sec, time_nsec;
368 char *end;
369
370 time_sec = strtoul(str, &end, 10);
371 if (*end != '.' && *end != '\0')
372 return -1;
373
374 if (*end == '.') {
375 int i;
376 char nsec_buf[10];
377
378 if (strlen(++end) > 9)
379 return -1;
380
381 strncpy(nsec_buf, end, 9);
382 nsec_buf[9] = '\0';
383
384 /* make it nsec precision */
385 for (i = strlen(nsec_buf); i < 9; i++)
386 nsec_buf[i] = '0';
387
388 time_nsec = strtoul(nsec_buf, &end, 10);
389 if (*end != '\0')
390 return -1;
391 } else
392 time_nsec = 0;
393
394 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
395 return 0;
396}
397
398unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
399{
400 struct parse_tag *i = tags;
401
402 while (i->tag) {
403 char *s;
404
405 s = strchr(str, i->tag);
406 if (s) {
407 unsigned long int value;
408 char *endptr;
409
410 value = strtoul(str, &endptr, 10);
411 if (s != endptr)
412 break;
413
414 if (value > ULONG_MAX / i->mult)
415 break;
416 value *= i->mult;
417 return value;
418 }
419 i++;
420 }
421
422 return (unsigned long) -1;
423}
424
425int filename__read_int(const char *filename, int *value)
426{
427 char line[64];
428 int fd = open(filename, O_RDONLY), err = -1;
429
430 if (fd < 0)
431 return -1;
432
433 if (read(fd, line, sizeof(line)) > 0) {
434 *value = atoi(line);
435 err = 0;
436 }
437
438 close(fd);
439 return err;
440}
441
442int filename__read_str(const char *filename, char **buf, size_t *sizep)
443{
444 size_t size = 0, alloc_size = 0;
445 void *bf = NULL, *nbf;
446 int fd, n, err = 0;
447
448 fd = open(filename, O_RDONLY);
449 if (fd < 0)
450 return -errno;
451
452 do {
453 if (size == alloc_size) {
454 alloc_size += BUFSIZ;
455 nbf = realloc(bf, alloc_size);
456 if (!nbf) {
457 err = -ENOMEM;
458 break;
459 }
460
461 bf = nbf;
462 }
463
464 n = read(fd, bf + size, alloc_size - size);
465 if (n < 0) {
466 if (size) {
467 pr_warning("read failed %d: %s\n",
468 errno, strerror(errno));
469 err = 0;
470 } else
471 err = -errno;
472
473 break;
474 }
475
476 size += n;
477 } while (n > 0);
478
479 if (!err) {
480 *sizep = size;
481 *buf = bf;
482 } else
483 free(bf);
484
485 close(fd);
486 return err;
487}
488
489const char *get_filename_for_perf_kvm(void)
490{
491 const char *filename;
492
493 if (perf_host && !perf_guest)
494 filename = strdup("perf.data.host");
495 else if (!perf_host && perf_guest)
496 filename = strdup("perf.data.guest");
497 else
498 filename = strdup("perf.data.kvm");
499
500 return filename;
501}
502
503int perf_event_paranoid(void)
504{
505 char path[PATH_MAX];
506 const char *procfs = procfs__mountpoint();
507 int value;
508
509 if (!procfs)
510 return INT_MAX;
511
512 scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs);
513
514 if (filename__read_int(path, &value))
515 return INT_MAX;
516
517 return value;
518}
519
520void mem_bswap_32(void *src, int byte_size)
521{
522 u32 *m = src;
523 while (byte_size > 0) {
524 *m = bswap_32(*m);
525 byte_size -= sizeof(u32);
526 ++m;
527 }
528}
529
530void mem_bswap_64(void *src, int byte_size)
531{
532 u64 *m = src;
533
534 while (byte_size > 0) {
535 *m = bswap_64(*m);
536 byte_size -= sizeof(u64);
537 ++m;
538 }
539}
1#include "util.h"
2#include <sys/mman.h>
3
4int mkdir_p(char *path, mode_t mode)
5{
6 struct stat st;
7 int err;
8 char *d = path;
9
10 if (*d != '/')
11 return -1;
12
13 if (stat(path, &st) == 0)
14 return 0;
15
16 while (*++d == '/');
17
18 while ((d = strchr(d, '/'))) {
19 *d = '\0';
20 err = stat(path, &st) && mkdir(path, mode);
21 *d++ = '/';
22 if (err)
23 return -1;
24 while (*d == '/')
25 ++d;
26 }
27 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
28}
29
30static int slow_copyfile(const char *from, const char *to)
31{
32 int err = 0;
33 char *line = NULL;
34 size_t n;
35 FILE *from_fp = fopen(from, "r"), *to_fp;
36
37 if (from_fp == NULL)
38 goto out;
39
40 to_fp = fopen(to, "w");
41 if (to_fp == NULL)
42 goto out_fclose_from;
43
44 while (getline(&line, &n, from_fp) > 0)
45 if (fputs(line, to_fp) == EOF)
46 goto out_fclose_to;
47 err = 0;
48out_fclose_to:
49 fclose(to_fp);
50 free(line);
51out_fclose_from:
52 fclose(from_fp);
53out:
54 return err;
55}
56
57int copyfile(const char *from, const char *to)
58{
59 int fromfd, tofd;
60 struct stat st;
61 void *addr;
62 int err = -1;
63
64 if (stat(from, &st))
65 goto out;
66
67 if (st.st_size == 0) /* /proc? do it slowly... */
68 return slow_copyfile(from, to);
69
70 fromfd = open(from, O_RDONLY);
71 if (fromfd < 0)
72 goto out;
73
74 tofd = creat(to, 0755);
75 if (tofd < 0)
76 goto out_close_from;
77
78 addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
79 if (addr == MAP_FAILED)
80 goto out_close_to;
81
82 if (write(tofd, addr, st.st_size) == st.st_size)
83 err = 0;
84
85 munmap(addr, st.st_size);
86out_close_to:
87 close(tofd);
88 if (err)
89 unlink(to);
90out_close_from:
91 close(fromfd);
92out:
93 return err;
94}
95
96unsigned long convert_unit(unsigned long value, char *unit)
97{
98 *unit = ' ';
99
100 if (value > 1000) {
101 value /= 1000;
102 *unit = 'K';
103 }
104
105 if (value > 1000) {
106 value /= 1000;
107 *unit = 'M';
108 }
109
110 if (value > 1000) {
111 value /= 1000;
112 *unit = 'G';
113 }
114
115 return value;
116}
117
118int readn(int fd, void *buf, size_t n)
119{
120 void *buf_start = buf;
121
122 while (n) {
123 int ret = read(fd, buf, n);
124
125 if (ret <= 0)
126 return ret;
127
128 n -= ret;
129 buf += ret;
130 }
131
132 return buf - buf_start;
133}