1
2#include "../perf.h"
3#include "util.h"
4#include "debug.h"
5#include <api/fs/fs.h>
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/utsname.h>
9#include <dirent.h>
10#include <fcntl.h>
11#include <inttypes.h>
12#include <signal.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <errno.h>
17#include <limits.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/time64.h>
21#include <unistd.h>
22#include "strlist.h"
23
24
25
26
27
28bool perf_singlethreaded = true;
29
30void perf_set_singlethreaded(void)
31{
32 perf_singlethreaded = true;
33}
34
35void perf_set_multithreaded(void)
36{
37 perf_singlethreaded = false;
38}
39
40unsigned int page_size;
41int cacheline_size;
42
43int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
44int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
45
46bool test_attr__enabled;
47
48bool perf_host = true;
49bool perf_guest = false;
50
51void event_attr_init(struct perf_event_attr *attr)
52{
53 if (!perf_host)
54 attr->exclude_host = 1;
55 if (!perf_guest)
56 attr->exclude_guest = 1;
57
58 attr->size = sizeof(*attr);
59}
60
61int mkdir_p(char *path, mode_t mode)
62{
63 struct stat st;
64 int err;
65 char *d = path;
66
67 if (*d != '/')
68 return -1;
69
70 if (stat(path, &st) == 0)
71 return 0;
72
73 while (*++d == '/');
74
75 while ((d = strchr(d, '/'))) {
76 *d = '\0';
77 err = stat(path, &st) && mkdir(path, mode);
78 *d++ = '/';
79 if (err)
80 return -1;
81 while (*d == '/')
82 ++d;
83 }
84 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
85}
86
87int rm_rf(const char *path)
88{
89 DIR *dir;
90 int ret = 0;
91 struct dirent *d;
92 char namebuf[PATH_MAX];
93
94 dir = opendir(path);
95 if (dir == NULL)
96 return 0;
97
98 while ((d = readdir(dir)) != NULL && !ret) {
99 struct stat statbuf;
100
101 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
102 continue;
103
104 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
105 path, d->d_name);
106
107
108 ret = lstat(namebuf, &statbuf);
109 if (ret < 0) {
110 pr_debug("stat failed: %s\n", namebuf);
111 break;
112 }
113
114 if (S_ISDIR(statbuf.st_mode))
115 ret = rm_rf(namebuf);
116 else
117 ret = unlink(namebuf);
118 }
119 closedir(dir);
120
121 if (ret < 0)
122 return ret;
123
124 return rmdir(path);
125}
126
127
128bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
129{
130 return d->d_name[0] != '.';
131}
132
133
134struct strlist *lsdir(const char *name,
135 bool (*filter)(const char *, struct dirent *))
136{
137 struct strlist *list = NULL;
138 DIR *dir;
139 struct dirent *d;
140
141 dir = opendir(name);
142 if (!dir)
143 return NULL;
144
145 list = strlist__new(NULL, NULL);
146 if (!list) {
147 errno = ENOMEM;
148 goto out;
149 }
150
151 while ((d = readdir(dir)) != NULL) {
152 if (!filter || filter(name, d))
153 strlist__add(list, d->d_name);
154 }
155
156out:
157 closedir(dir);
158 return list;
159}
160
161static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
162{
163 int err = -1;
164 char *line = NULL;
165 size_t n;
166 FILE *from_fp, *to_fp;
167 struct nscookie nsc;
168
169 nsinfo__mountns_enter(nsi, &nsc);
170 from_fp = fopen(from, "r");
171 nsinfo__mountns_exit(&nsc);
172 if (from_fp == NULL)
173 goto out;
174
175 to_fp = fopen(to, "w");
176 if (to_fp == NULL)
177 goto out_fclose_from;
178
179 while (getline(&line, &n, from_fp) > 0)
180 if (fputs(line, to_fp) == EOF)
181 goto out_fclose_to;
182 err = 0;
183out_fclose_to:
184 fclose(to_fp);
185 free(line);
186out_fclose_from:
187 fclose(from_fp);
188out:
189 return err;
190}
191
192static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
193{
194 void *ptr;
195 loff_t pgoff;
196
197 pgoff = off_in & ~(page_size - 1);
198 off_in -= pgoff;
199
200 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
201 if (ptr == MAP_FAILED)
202 return -1;
203
204 while (size) {
205 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
206 if (ret < 0 && errno == EINTR)
207 continue;
208 if (ret <= 0)
209 break;
210
211 size -= ret;
212 off_in += ret;
213 off_out += ret;
214 }
215 munmap(ptr, off_in + size);
216
217 return size ? -1 : 0;
218}
219
220static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
221 struct nsinfo *nsi)
222{
223 int fromfd, tofd;
224 struct stat st;
225 int err;
226 char *tmp = NULL, *ptr = NULL;
227 struct nscookie nsc;
228
229 nsinfo__mountns_enter(nsi, &nsc);
230 err = stat(from, &st);
231 nsinfo__mountns_exit(&nsc);
232 if (err)
233 goto out;
234 err = -1;
235
236
237 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
238 tmp = NULL;
239 goto out;
240 }
241 ptr = strrchr(tmp, '/');
242 if (!ptr)
243 goto out;
244 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
245 *ptr = '.';
246
247 tofd = mkstemp(tmp);
248 if (tofd < 0)
249 goto out;
250
251 if (fchmod(tofd, mode))
252 goto out_close_to;
253
254 if (st.st_size == 0) {
255 err = slow_copyfile(from, tmp, nsi);
256 goto out_close_to;
257 }
258
259 nsinfo__mountns_enter(nsi, &nsc);
260 fromfd = open(from, O_RDONLY);
261 nsinfo__mountns_exit(&nsc);
262 if (fromfd < 0)
263 goto out_close_to;
264
265 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
266
267 close(fromfd);
268out_close_to:
269 close(tofd);
270 if (!err)
271 err = link(tmp, to);
272 unlink(tmp);
273out:
274 free(tmp);
275 return err;
276}
277
278int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
279{
280 return copyfile_mode_ns(from, to, 0755, nsi);
281}
282
283int copyfile_mode(const char *from, const char *to, mode_t mode)
284{
285 return copyfile_mode_ns(from, to, mode, NULL);
286}
287
288int copyfile(const char *from, const char *to)
289{
290 return copyfile_mode(from, to, 0755);
291}
292
293static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
294{
295 void *buf_start = buf;
296 size_t left = n;
297
298 while (left) {
299
300 ssize_t ret = is_read ? read(fd, buf, left) :
301 write(fd, buf, left);
302
303 if (ret < 0 && errno == EINTR)
304 continue;
305 if (ret <= 0)
306 return ret;
307
308 left -= ret;
309 buf += ret;
310 }
311
312 BUG_ON((size_t)(buf - buf_start) != n);
313 return n;
314}
315
316
317
318
319ssize_t readn(int fd, void *buf, size_t n)
320{
321 return ion(true, fd, buf, n);
322}
323
324
325
326
327ssize_t writen(int fd, const void *buf, size_t n)
328{
329
330 return ion(false, fd, (void *)buf, n);
331}
332
333size_t hex_width(u64 v)
334{
335 size_t n = 1;
336
337 while ((v >>= 4))
338 ++n;
339
340 return n;
341}
342
343
344
345
346
347int hex2u64(const char *ptr, u64 *long_val)
348{
349 char *p;
350
351 *long_val = strtoull(ptr, &p, 16);
352
353 return p - ptr;
354}
355
356int perf_event_paranoid(void)
357{
358 int value;
359
360 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
361 return INT_MAX;
362
363 return value;
364}
365static int
366fetch_ubuntu_kernel_version(unsigned int *puint)
367{
368 ssize_t len;
369 size_t line_len = 0;
370 char *ptr, *line = NULL;
371 int version, patchlevel, sublevel, err;
372 FILE *vsig;
373
374 if (!puint)
375 return 0;
376
377 vsig = fopen("/proc/version_signature", "r");
378 if (!vsig) {
379 pr_debug("Open /proc/version_signature failed: %s\n",
380 strerror(errno));
381 return -1;
382 }
383
384 len = getline(&line, &line_len, vsig);
385 fclose(vsig);
386 err = -1;
387 if (len <= 0) {
388 pr_debug("Reading from /proc/version_signature failed: %s\n",
389 strerror(errno));
390 goto errout;
391 }
392
393 ptr = strrchr(line, ' ');
394 if (!ptr) {
395 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
396 goto errout;
397 }
398
399 err = sscanf(ptr + 1, "%d.%d.%d",
400 &version, &patchlevel, &sublevel);
401 if (err != 3) {
402 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
403 line);
404 goto errout;
405 }
406
407 *puint = (version << 16) + (patchlevel << 8) + sublevel;
408 err = 0;
409errout:
410 free(line);
411 return err;
412}
413
414int
415fetch_kernel_version(unsigned int *puint, char *str,
416 size_t str_size)
417{
418 struct utsname utsname;
419 int version, patchlevel, sublevel, err;
420 bool int_ver_ready = false;
421
422 if (access("/proc/version_signature", R_OK) == 0)
423 if (!fetch_ubuntu_kernel_version(puint))
424 int_ver_ready = true;
425
426 if (uname(&utsname))
427 return -1;
428
429 if (str && str_size) {
430 strncpy(str, utsname.release, str_size);
431 str[str_size - 1] = '\0';
432 }
433
434 if (!puint || int_ver_ready)
435 return 0;
436
437 err = sscanf(utsname.release, "%d.%d.%d",
438 &version, &patchlevel, &sublevel);
439
440 if (err != 3) {
441 pr_debug("Unable to get kernel version from uname '%s'\n",
442 utsname.release);
443 return -1;
444 }
445
446 *puint = (version << 16) + (patchlevel << 8) + sublevel;
447 return 0;
448}
449
450const char *perf_tip(const char *dirpath)
451{
452 struct strlist *tips;
453 struct str_node *node;
454 char *tip = NULL;
455 struct strlist_config conf = {
456 .dirname = dirpath,
457 .file_only = true,
458 };
459
460 tips = strlist__new("tips.txt", &conf);
461 if (tips == NULL)
462 return errno == ENOENT ? NULL :
463 "Tip: check path of tips.txt or get more memory! ;-p";
464
465 if (strlist__nr_entries(tips) == 0)
466 goto out;
467
468 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
469 if (asprintf(&tip, "Tip: %s", node->s) < 0)
470 tip = (char *)"Tip: get more memory! ;-)";
471
472out:
473 strlist__delete(tips);
474
475 return tip;
476}
477
