util.c 9.5 KB
Newer Older
1
// SPDX-License-Identifier: GPL-2.0
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 14
#include <stdio.h>
#include <stdlib.h>
15 16
#include <string.h>
#include <errno.h>
17
#include <limits.h>
J
Jiri Olsa 已提交
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
/*
 * XXX We need to find a better place for these things...
 */
27 28 29 30 31 32 33 34 35 36 37 38 39

bool perf_singlethreaded = true;

void perf_set_singlethreaded(void)
{
	perf_singlethreaded = true;
}

void perf_set_multithreaded(void)
{
	perf_singlethreaded = false;
}

40
unsigned int page_size;
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

#ifdef _SC_LEVEL1_DCACHE_LINESIZE
#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
#else
static void cache_line_size(int *cacheline_sizep)
{
	if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
		pr_debug("cannot determine cache line size");
}
#endif

int cacheline_size(void)
{
	static int size;

	if (!size)
		cache_line_size(&size);

	return size;
}
61

62 63
int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
64

65 66 67 68 69 70 71 72 73 74 75 76 77
int sysctl__max_stack(void)
{
	int value;

	if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
		sysctl_perf_event_max_stack = value;

	if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
		sysctl_perf_event_max_contexts_per_stack = value;

	return sysctl_perf_event_max_stack;
}

78 79
bool test_attr__enabled;

80
bool perf_host  = true;
81
bool perf_guest = false;
82 83 84 85 86 87 88

void event_attr_init(struct perf_event_attr *attr)
{
	if (!perf_host)
		attr->exclude_host  = 1;
	if (!perf_guest)
		attr->exclude_guest = 1;
89 90
	/* to capture ABI version */
	attr->size = sizeof(*attr);
91 92
}

93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
int mkdir_p(char *path, mode_t mode)
{
	struct stat st;
	int err;
	char *d = path;

	if (*d != '/')
		return -1;

	if (stat(path, &st) == 0)
		return 0;

	while (*++d == '/');

	while ((d = strchr(d, '/'))) {
		*d = '\0';
		err = stat(path, &st) && mkdir(path, mode);
		*d++ = '/';
		if (err)
			return -1;
		while (*d == '/')
			++d;
	}
	return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
}

119
int rm_rf(const char *path)
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
{
	DIR *dir;
	int ret = 0;
	struct dirent *d;
	char namebuf[PATH_MAX];

	dir = opendir(path);
	if (dir == NULL)
		return 0;

	while ((d = readdir(dir)) != NULL && !ret) {
		struct stat statbuf;

		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
			continue;

		scnprintf(namebuf, sizeof(namebuf), "%s/%s",
			  path, d->d_name);

139 140
		/* We have to check symbolic link itself */
		ret = lstat(namebuf, &statbuf);
141 142 143 144 145
		if (ret < 0) {
			pr_debug("stat failed: %s\n", namebuf);
			break;
		}

146
		if (S_ISDIR(statbuf.st_mode))
147
			ret = rm_rf(namebuf);
148 149
		else
			ret = unlink(namebuf);
150 151 152 153 154 155 156 157 158
	}
	closedir(dir);

	if (ret < 0)
		return ret;

	return rmdir(path);
}

159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
/* A filter which removes dot files */
bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
{
	return d->d_name[0] != '.';
}

/* lsdir reads a directory and store it in strlist */
struct strlist *lsdir(const char *name,
		      bool (*filter)(const char *, struct dirent *))
{
	struct strlist *list = NULL;
	DIR *dir;
	struct dirent *d;

	dir = opendir(name);
	if (!dir)
		return NULL;

	list = strlist__new(NULL, NULL);
	if (!list) {
179
		errno = ENOMEM;
180 181 182 183 184 185 186 187 188 189 190 191 192
		goto out;
	}

	while ((d = readdir(dir)) != NULL) {
		if (!filter || filter(name, d))
			strlist__add(list, d->d_name);
	}

out:
	closedir(dir);
	return list;
}

193
static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
194
{
A
Adrian Hunter 已提交
195
	int err = -1;
196 197
	char *line = NULL;
	size_t n;
198 199
	FILE *from_fp, *to_fp;
	struct nscookie nsc;
200

201 202 203
	nsinfo__mountns_enter(nsi, &nsc);
	from_fp = fopen(from, "r");
	nsinfo__mountns_exit(&nsc);
204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
	if (from_fp == NULL)
		goto out;

	to_fp = fopen(to, "w");
	if (to_fp == NULL)
		goto out_fclose_from;

	while (getline(&line, &n, from_fp) > 0)
		if (fputs(line, to_fp) == EOF)
			goto out_fclose_to;
	err = 0;
out_fclose_to:
	fclose(to_fp);
	free(line);
out_fclose_from:
	fclose(from_fp);
out:
	return err;
}

224
static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244
{
	void *ptr;
	loff_t pgoff;

	pgoff = off_in & ~(page_size - 1);
	off_in -= pgoff;

	ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
	if (ptr == MAP_FAILED)
		return -1;

	while (size) {
		ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
		if (ret < 0 && errno == EINTR)
			continue;
		if (ret <= 0)
			break;

		size -= ret;
		off_in += ret;
245
		off_out += ret;
246 247 248 249 250 251
	}
	munmap(ptr, off_in + size);

	return size ? -1 : 0;
}

252 253
static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
			    struct nsinfo *nsi)
254 255 256
{
	int fromfd, tofd;
	struct stat st;
257
	int err;
258
	char *tmp = NULL, *ptr = NULL;
259
	struct nscookie nsc;
260

261 262 263 264
	nsinfo__mountns_enter(nsi, &nsc);
	err = stat(from, &st);
	nsinfo__mountns_exit(&nsc);
	if (err)
265
		goto out;
266
	err = -1;
267

268 269 270
	/* extra 'x' at the end is to reserve space for '.' */
	if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
		tmp = NULL;
271
		goto out;
272 273 274 275 276 277
	}
	ptr = strrchr(tmp, '/');
	if (!ptr)
		goto out;
	ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
	*ptr = '.';
278

279
	tofd = mkstemp(tmp);
280
	if (tofd < 0)
281 282 283 284 285 286
		goto out;

	if (fchmod(tofd, mode))
		goto out_close_to;

	if (st.st_size == 0) { /* /proc? do it slowly... */
287
		err = slow_copyfile(from, tmp, nsi);
288 289 290
		goto out_close_to;
	}

291
	nsinfo__mountns_enter(nsi, &nsc);
292
	fromfd = open(from, O_RDONLY);
293
	nsinfo__mountns_exit(&nsc);
294 295
	if (fromfd < 0)
		goto out_close_to;
296

297
	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
298 299

	close(fromfd);
300 301 302 303 304
out_close_to:
	close(tofd);
	if (!err)
		err = link(tmp, to);
	unlink(tmp);
305
out:
306
	free(tmp);
307 308
	return err;
}
309

310 311 312 313 314 315 316 317 318 319
int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
{
	return copyfile_mode_ns(from, to, 0755, nsi);
}

int copyfile_mode(const char *from, const char *to, mode_t mode)
{
	return copyfile_mode_ns(from, to, mode, NULL);
}

A
Adrian Hunter 已提交
320 321 322 323 324
int copyfile(const char *from, const char *to)
{
	return copyfile_mode(from, to, 0755);
}

J
Jiri Olsa 已提交
325
static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
326 327
{
	void *buf_start = buf;
J
Jiri Olsa 已提交
328
	size_t left = n;
329

J
Jiri Olsa 已提交
330
	while (left) {
331
		/* buf must be treated as const if !is_read. */
J
Jiri Olsa 已提交
332 333
		ssize_t ret = is_read ? read(fd, buf, left) :
					write(fd, buf, left);
334

335 336
		if (ret < 0 && errno == EINTR)
			continue;
337 338 339
		if (ret <= 0)
			return ret;

J
Jiri Olsa 已提交
340 341
		left -= ret;
		buf  += ret;
342 343
	}

J
Jiri Olsa 已提交
344 345
	BUG_ON((size_t)(buf - buf_start) != n);
	return n;
346
}
347

J
Jiri Olsa 已提交
348 349 350 351 352 353 354 355 356 357 358
/*
 * Read exactly 'n' bytes or return an error.
 */
ssize_t readn(int fd, void *buf, size_t n)
{
	return ion(true, fd, buf, n);
}

/*
 * Write exactly 'n' bytes or return an error.
 */
359
ssize_t writen(int fd, const void *buf, size_t n)
J
Jiri Olsa 已提交
360
{
361 362
	/* ion does not modify buf. */
	return ion(false, fd, (void *)buf, n);
J
Jiri Olsa 已提交
363 364
}

365 366 367 368 369 370 371 372 373
size_t hex_width(u64 v)
{
	size_t n = 1;

	while ((v >>= 4))
		++n;

	return n;
}
374

375 376 377 378 379 380
/*
 * While we find nice hex chars, build a long_val.
 * Return number of chars processed.
 */
int hex2u64(const char *ptr, u64 *long_val)
{
381
	char *p;
382

383
	*long_val = strtoull(ptr, &p, 16);
384 385 386 387

	return p - ptr;
}

388 389 390 391
int perf_event_paranoid(void)
{
	int value;

392
	if (sysctl__read_int("kernel/perf_event_paranoid", &value))
393 394 395 396
		return INT_MAX;

	return value;
}
397 398 399 400 401 402 403
static int
fetch_ubuntu_kernel_version(unsigned int *puint)
{
	ssize_t len;
	size_t line_len = 0;
	char *ptr, *line = NULL;
	int version, patchlevel, sublevel, err;
404
	FILE *vsig;
405

406 407 408 409
	if (!puint)
		return 0;

	vsig = fopen("/proc/version_signature", "r");
410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438
	if (!vsig) {
		pr_debug("Open /proc/version_signature failed: %s\n",
			 strerror(errno));
		return -1;
	}

	len = getline(&line, &line_len, vsig);
	fclose(vsig);
	err = -1;
	if (len <= 0) {
		pr_debug("Reading from /proc/version_signature failed: %s\n",
			 strerror(errno));
		goto errout;
	}

	ptr = strrchr(line, ' ');
	if (!ptr) {
		pr_debug("Parsing /proc/version_signature failed: %s\n", line);
		goto errout;
	}

	err = sscanf(ptr + 1, "%d.%d.%d",
		     &version, &patchlevel, &sublevel);
	if (err != 3) {
		pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
			 line);
		goto errout;
	}

439
	*puint = (version << 16) + (patchlevel << 8) + sublevel;
440 441 442 443 444 445
	err = 0;
errout:
	free(line);
	return err;
}

446 447 448 449 450 451
int
fetch_kernel_version(unsigned int *puint, char *str,
		     size_t str_size)
{
	struct utsname utsname;
	int version, patchlevel, sublevel, err;
452 453 454 455 456
	bool int_ver_ready = false;

	if (access("/proc/version_signature", R_OK) == 0)
		if (!fetch_ubuntu_kernel_version(puint))
			int_ver_ready = true;
457 458 459 460 461 462 463 464 465

	if (uname(&utsname))
		return -1;

	if (str && str_size) {
		strncpy(str, utsname.release, str_size);
		str[str_size - 1] = '\0';
	}

466 467 468
	if (!puint || int_ver_ready)
		return 0;

469 470 471 472
	err = sscanf(utsname.release, "%d.%d.%d",
		     &version, &patchlevel, &sublevel);

	if (err != 3) {
473
		pr_debug("Unable to get kernel version from uname '%s'\n",
474 475 476 477
			 utsname.release);
		return -1;
	}

478
	*puint = (version << 16) + (patchlevel << 8) + sublevel;
479 480
	return 0;
}
481 482 483 484 485 486 487

const char *perf_tip(const char *dirpath)
{
	struct strlist *tips;
	struct str_node *node;
	char *tip = NULL;
	struct strlist_config conf = {
488 489
		.dirname = dirpath,
		.file_only = true,
490 491 492
	};

	tips = strlist__new("tips.txt", &conf);
493
	if (tips == NULL)
494 495
		return errno == ENOENT ? NULL :
			"Tip: check path of tips.txt or get more memory! ;-p";
496 497

	if (strlist__nr_entries(tips) == 0)
498 499 500 501 502 503 504 505 506 507 508
		goto out;

	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
	if (asprintf(&tip, "Tip: %s", node->s) < 0)
		tip = (char *)"Tip: get more memory! ;-)";

out:
	strlist__delete(tips);

	return tip;
}