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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/tools/perf/util/util.c
....@@ -1,9 +1,8 @@
11 // SPDX-License-Identifier: GPL-2.0
2
-#include "../perf.h"
32 #include "util.h"
43 #include "debug.h"
4
+#include "event.h"
55 #include <api/fs/fs.h>
6
-#include <sys/mman.h>
76 #include <sys/stat.h>
87 #include <sys/utsname.h>
98 #include <dirent.h>
....@@ -15,11 +14,14 @@
1514 #include <string.h>
1615 #include <errno.h>
1716 #include <limits.h>
17
+#include <linux/capability.h>
1818 #include <linux/kernel.h>
1919 #include <linux/log2.h>
2020 #include <linux/time64.h>
2121 #include <unistd.h>
22
+#include "cap.h"
2223 #include "strlist.h"
24
+#include "string2.h"
2325 
2426 /*
2527  * XXX We need to find a better place for these things...
....@@ -37,28 +39,6 @@
3739 	perf_singlethreaded = false;
3840 }
3941 
40
-unsigned int page_size;
41
-
42
-#ifdef _SC_LEVEL1_DCACHE_LINESIZE
43
-#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
44
-#else
45
-static void cache_line_size(int *cacheline_sizep)
46
-{
47
-	if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
48
-		pr_debug("cannot determine cache line size");
49
-}
50
-#endif
51
-
52
-int cacheline_size(void)
53
-{
54
-	static int size;
55
-
56
-	if (!size)
57
-		cache_line_size(&size);
58
-
59
-	return size;
60
-}
61
-
6242 int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
6343 int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
6444 
....@@ -73,6 +53,24 @@
7353 		sysctl_perf_event_max_contexts_per_stack = value;
7454 
7555 	return sysctl_perf_event_max_stack;
56
+}
57
+
58
+bool sysctl__nmi_watchdog_enabled(void)
59
+{
60
+	static bool cached;
61
+	static bool nmi_watchdog;
62
+	int value;
63
+
64
+	if (cached)
65
+		return nmi_watchdog;
66
+
67
+	if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0)
68
+		return false;
69
+
70
+	nmi_watchdog = (value > 0) ? true : false;
71
+	cached = true;
72
+
73
+	return nmi_watchdog;
7674 }
7775 
7876 bool test_attr__enabled;
....@@ -116,22 +114,68 @@
116114 	return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
117115 }
118116 
119
-int rm_rf(const char *path)
117
+static bool match_pat(char *file, const char **pat)
118
+{
119
+	int i = 0;
120
+
121
+	if (!pat)
122
+		return true;
123
+
124
+	while (pat[i]) {
125
+		if (strglobmatch(file, pat[i]))
126
+			return true;
127
+
128
+		i++;
129
+	}
130
+
131
+	return false;
132
+}
133
+
134
+/*
135
+ * The depth specify how deep the removal will go.
136
+ * 0       - will remove only files under the 'path' directory
137
+ * 1 .. x  - will dive in x-level deep under the 'path' directory
138
+ *
139
+ * If specified the pat is array of string patterns ended with NULL,
140
+ * which are checked upon every file/directory found. Only matching
141
+ * ones are removed.
142
+ *
143
+ * The function returns:
144
+ *    0 on success
145
+ *   -1 on removal failure with errno set
146
+ *   -2 on pattern failure
147
+ */
148
+static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
120149 {
121150 	DIR *dir;
122
-	int ret = 0;
151
+	int ret;
123152 	struct dirent *d;
124153 	char namebuf[PATH_MAX];
154
+	struct stat statbuf;
125155 
126
-	dir = opendir(path);
127
-	if (dir == NULL)
156
+	/* Do not fail if there's no file. */
157
+	ret = lstat(path, &statbuf);
158
+	if (ret)
128159 		return 0;
129160 
161
+	/* Try to remove any file we get. */
162
+	if (!(statbuf.st_mode & S_IFDIR))
163
+		return unlink(path);
164
+
165
+	/* We have directory in path. */
166
+	dir = opendir(path);
167
+	if (dir == NULL)
168
+		return -1;
169
+
130170 	while ((d = readdir(dir)) != NULL && !ret) {
131
-		struct stat statbuf;
132171 
133172 		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
134173 			continue;
174
+
175
+		if (!match_pat(d->d_name, pat)) {
176
+			ret =  -2;
177
+			break;
178
+		}
135179 
136180 		scnprintf(namebuf, sizeof(namebuf), "%s/%s",
137181 			  path, d->d_name);
....@@ -144,7 +188,7 @@
144188 		}
145189 
146190 		if (S_ISDIR(statbuf.st_mode))
147
-			ret = rm_rf(namebuf);
191
+			ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0;
148192 		else
149193 			ret = unlink(namebuf);
150194 	}
....@@ -154,6 +198,39 @@
154198 		return ret;
155199 
156200 	return rmdir(path);
201
+}
202
+
203
+static int rm_rf_kcore_dir(const char *path)
204
+{
205
+	char kcore_dir_path[PATH_MAX];
206
+	const char *pat[] = {
207
+		"kcore",
208
+		"kallsyms",
209
+		"modules",
210
+		NULL,
211
+	};
212
+
213
+	snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path);
214
+
215
+	return rm_rf_depth_pat(kcore_dir_path, 0, pat);
216
+}
217
+
218
+int rm_rf_perf_data(const char *path)
219
+{
220
+	const char *pat[] = {
221
+		"data",
222
+		"data.*",
223
+		NULL,
224
+	};
225
+
226
+	rm_rf_kcore_dir(path);
227
+
228
+	return rm_rf_depth_pat(path, 0, pat);
229
+}
230
+
231
+int rm_rf(const char *path)
232
+{
233
+	return rm_rf_depth_pat(path, INT_MAX, NULL);
157234 }
158235 
159236 /* A filter which removes dot files */
....@@ -190,178 +267,6 @@
190267 	return list;
191268 }
192269 
193
-static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
194
-{
195
-	int err = -1;
196
-	char *line = NULL;
197
-	size_t n;
198
-	FILE *from_fp, *to_fp;
199
-	struct nscookie nsc;
200
-
201
-	nsinfo__mountns_enter(nsi, &nsc);
202
-	from_fp = fopen(from, "r");
203
-	nsinfo__mountns_exit(&nsc);
204
-	if (from_fp == NULL)
205
-		goto out;
206
-
207
-	to_fp = fopen(to, "w");
208
-	if (to_fp == NULL)
209
-		goto out_fclose_from;
210
-
211
-	while (getline(&line, &n, from_fp) > 0)
212
-		if (fputs(line, to_fp) == EOF)
213
-			goto out_fclose_to;
214
-	err = 0;
215
-out_fclose_to:
216
-	fclose(to_fp);
217
-	free(line);
218
-out_fclose_from:
219
-	fclose(from_fp);
220
-out:
221
-	return err;
222
-}
223
-
224
-static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
225
-{
226
-	void *ptr;
227
-	loff_t pgoff;
228
-
229
-	pgoff = off_in & ~(page_size - 1);
230
-	off_in -= pgoff;
231
-
232
-	ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
233
-	if (ptr == MAP_FAILED)
234
-		return -1;
235
-
236
-	while (size) {
237
-		ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
238
-		if (ret < 0 && errno == EINTR)
239
-			continue;
240
-		if (ret <= 0)
241
-			break;
242
-
243
-		size -= ret;
244
-		off_in += ret;
245
-		off_out += ret;
246
-	}
247
-	munmap(ptr, off_in + size);
248
-
249
-	return size ? -1 : 0;
250
-}
251
-
252
-static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
253
-			    struct nsinfo *nsi)
254
-{
255
-	int fromfd, tofd;
256
-	struct stat st;
257
-	int err;
258
-	char *tmp = NULL, *ptr = NULL;
259
-	struct nscookie nsc;
260
-
261
-	nsinfo__mountns_enter(nsi, &nsc);
262
-	err = stat(from, &st);
263
-	nsinfo__mountns_exit(&nsc);
264
-	if (err)
265
-		goto out;
266
-	err = -1;
267
-
268
-	/* extra 'x' at the end is to reserve space for '.' */
269
-	if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
270
-		tmp = NULL;
271
-		goto out;
272
-	}
273
-	ptr = strrchr(tmp, '/');
274
-	if (!ptr)
275
-		goto out;
276
-	ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
277
-	*ptr = '.';
278
-
279
-	tofd = mkstemp(tmp);
280
-	if (tofd < 0)
281
-		goto out;
282
-
283
-	if (fchmod(tofd, mode))
284
-		goto out_close_to;
285
-
286
-	if (st.st_size == 0) { /* /proc? do it slowly... */
287
-		err = slow_copyfile(from, tmp, nsi);
288
-		goto out_close_to;
289
-	}
290
-
291
-	nsinfo__mountns_enter(nsi, &nsc);
292
-	fromfd = open(from, O_RDONLY);
293
-	nsinfo__mountns_exit(&nsc);
294
-	if (fromfd < 0)
295
-		goto out_close_to;
296
-
297
-	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
298
-
299
-	close(fromfd);
300
-out_close_to:
301
-	close(tofd);
302
-	if (!err)
303
-		err = link(tmp, to);
304
-	unlink(tmp);
305
-out:
306
-	free(tmp);
307
-	return err;
308
-}
309
-
310
-int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
311
-{
312
-	return copyfile_mode_ns(from, to, 0755, nsi);
313
-}
314
-
315
-int copyfile_mode(const char *from, const char *to, mode_t mode)
316
-{
317
-	return copyfile_mode_ns(from, to, mode, NULL);
318
-}
319
-
320
-int copyfile(const char *from, const char *to)
321
-{
322
-	return copyfile_mode(from, to, 0755);
323
-}
324
-
325
-static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
326
-{
327
-	void *buf_start = buf;
328
-	size_t left = n;
329
-
330
-	while (left) {
331
-		/* buf must be treated as const if !is_read. */
332
-		ssize_t ret = is_read ? read(fd, buf, left) :
333
-					write(fd, buf, left);
334
-
335
-		if (ret < 0 && errno == EINTR)
336
-			continue;
337
-		if (ret <= 0)
338
-			return ret;
339
-
340
-		left -= ret;
341
-		buf  += ret;
342
-	}
343
-
344
-	BUG_ON((size_t)(buf - buf_start) != n);
345
-	return n;
346
-}
347
-
348
-/*
349
- * Read exactly 'n' bytes or return an error.
350
- */
351
-ssize_t readn(int fd, void *buf, size_t n)
352
-{
353
-	return ion(true, fd, buf, n);
354
-}
355
-
356
-/*
357
- * Write exactly 'n' bytes or return an error.
358
- */
359
-ssize_t writen(int fd, const void *buf, size_t n)
360
-{
361
-	/* ion does not modify buf. */
362
-	return ion(false, fd, (void *)buf, n);
363
-}
364
-
365270 size_t hex_width(u64 v)
366271 {
367272 	size_t n = 1;
....@@ -370,19 +275,6 @@
370275 		++n;
371276 
372277 	return n;
373
-}
374
-
375
-/*
376
- * While we find nice hex chars, build a long_val.
377
- * Return number of chars processed.
378
- */
379
-int hex2u64(const char *ptr, u64 *long_val)
380
-{
381
-	char *p;
382
-
383
-	*long_val = strtoull(ptr, &p, 16);
384
-
385
-	return p - ptr;
386278 }
387279 
388280 int perf_event_paranoid(void)
....@@ -394,6 +286,14 @@
394286 
395287 	return value;
396288 }
289
+
290
+bool perf_event_paranoid_check(int max_level)
291
+{
292
+	return perf_cap__capable(CAP_SYS_ADMIN) ||
293
+			perf_cap__capable(CAP_PERFMON) ||
294
+			perf_event_paranoid() <= max_level;
295
+}
296
+
397297 static int
398298 fetch_ubuntu_kernel_version(unsigned int *puint)
399299 {
....@@ -479,30 +379,40 @@
479379 	return 0;
480380 }
481381 
482
-const char *perf_tip(const char *dirpath)
382
+int perf_tip(char **strp, const char *dirpath)
483383 {
484384 	struct strlist *tips;
485385 	struct str_node *node;
486
-	char *tip = NULL;
487386 	struct strlist_config conf = {
488387 		.dirname = dirpath,
489388 		.file_only = true,
490389 	};
390
+	int ret = 0;
491391 
392
+	*strp = NULL;
492393 	tips = strlist__new("tips.txt", &conf);
493394 	if (tips == NULL)
494
-		return errno == ENOENT ? NULL :
495
-			"Tip: check path of tips.txt or get more memory! ;-p";
395
+		return -errno;
496396 
497397 	if (strlist__nr_entries(tips) == 0)
498398 		goto out;
499399 
500400 	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
501
-	if (asprintf(&tip, "Tip: %s", node->s) < 0)
502
-		tip = (char *)"Tip: get more memory! ;-)";
401
+	if (asprintf(strp, "Tip: %s", node->s) < 0)
402
+		ret = -ENOMEM;
503403 
504404 out:
505405 	strlist__delete(tips);
506406 
507
-	return tip;
407
+	return ret;
408
+}
409
+
410
+char *perf_exe(char *buf, int len)
411
+{
412
+	int n = readlink("/proc/self/exe", buf, len);
413
+	if (n > 0) {
414
+		buf[n] = 0;
415
+		return buf;
416
+	}
417
+	return strcpy(buf, "perf");
508418 }