Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 1 | /* |
| 2 | * probe-file.c : operate ftrace k/uprobe events files |
| 3 | * |
| 4 | * Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
Arnaldo Carvalho de Melo | a43783a | 2017-04-18 10:46:11 -0300 | [diff] [blame] | 17 | #include <errno.h> |
Arnaldo Carvalho de Melo | 7a8ef4c | 2017-04-19 20:57:47 -0300 | [diff] [blame] | 18 | #include <sys/stat.h> |
| 19 | #include <sys/types.h> |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 20 | #include <sys/uio.h> |
Arnaldo Carvalho de Melo | 7a8ef4c | 2017-04-19 20:57:47 -0300 | [diff] [blame] | 21 | #include <unistd.h> |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 22 | #include "util.h" |
| 23 | #include "event.h" |
| 24 | #include "strlist.h" |
Arnaldo Carvalho de Melo | 8ec20b1 | 2017-04-18 10:57:25 -0300 | [diff] [blame] | 25 | #include "strfilter.h" |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 26 | #include "debug.h" |
| 27 | #include "cache.h" |
| 28 | #include "color.h" |
| 29 | #include "symbol.h" |
| 30 | #include "thread.h" |
Jiri Olsa | fbf9962 | 2015-09-02 09:56:45 +0200 | [diff] [blame] | 31 | #include <api/fs/tracing_path.h> |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 32 | #include "probe-event.h" |
| 33 | #include "probe-file.h" |
| 34 | #include "session.h" |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 35 | #include "perf_regs.h" |
Arnaldo Carvalho de Melo | a067558 | 2017-04-17 16:51:59 -0300 | [diff] [blame] | 36 | #include "string2.h" |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 37 | |
Ravi Bangoria | 2e1f8f7 | 2017-02-07 11:15:47 +0530 | [diff] [blame] | 38 | /* 4096 - 2 ('\n' + '\0') */ |
| 39 | #define MAX_CMDLEN 4094 |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 40 | |
| 41 | static void print_open_warning(int err, bool uprobe) |
| 42 | { |
| 43 | char sbuf[STRERR_BUFSIZE]; |
| 44 | |
| 45 | if (err == -ENOENT) { |
| 46 | const char *config; |
| 47 | |
| 48 | if (uprobe) |
| 49 | config = "CONFIG_UPROBE_EVENTS"; |
| 50 | else |
| 51 | config = "CONFIG_KPROBE_EVENTS"; |
| 52 | |
| 53 | pr_warning("%cprobe_events file does not exist" |
| 54 | " - please rebuild kernel with %s.\n", |
| 55 | uprobe ? 'u' : 'k', config); |
| 56 | } else if (err == -ENOTSUP) |
| 57 | pr_warning("Tracefs or debugfs is not mounted.\n"); |
| 58 | else |
| 59 | pr_warning("Failed to open %cprobe_events: %s\n", |
| 60 | uprobe ? 'u' : 'k', |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 61 | str_error_r(-err, sbuf, sizeof(sbuf))); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | static void print_both_open_warning(int kerr, int uerr) |
| 65 | { |
| 66 | /* Both kprobes and uprobes are disabled, warn it. */ |
| 67 | if (kerr == -ENOTSUP && uerr == -ENOTSUP) |
| 68 | pr_warning("Tracefs or debugfs is not mounted.\n"); |
| 69 | else if (kerr == -ENOENT && uerr == -ENOENT) |
| 70 | pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS " |
| 71 | "or/and CONFIG_UPROBE_EVENTS.\n"); |
| 72 | else { |
| 73 | char sbuf[STRERR_BUFSIZE]; |
| 74 | pr_warning("Failed to open kprobe events: %s.\n", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 75 | str_error_r(-kerr, sbuf, sizeof(sbuf))); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 76 | pr_warning("Failed to open uprobe events: %s.\n", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 77 | str_error_r(-uerr, sbuf, sizeof(sbuf))); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 78 | } |
| 79 | } |
| 80 | |
Naveen N. Rao | e491bc2 | 2017-02-23 17:07:23 +0530 | [diff] [blame] | 81 | int open_trace_file(const char *trace_file, bool readwrite) |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 82 | { |
| 83 | char buf[PATH_MAX]; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 84 | int ret; |
| 85 | |
Masami Hiramatsu | 04e1196 | 2016-08-24 14:57:58 +0900 | [diff] [blame] | 86 | ret = e_snprintf(buf, PATH_MAX, "%s/%s", |
| 87 | tracing_path, trace_file); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 88 | if (ret >= 0) { |
| 89 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
| 90 | if (readwrite && !probe_event_dry_run) |
| 91 | ret = open(buf, O_RDWR | O_APPEND, 0); |
| 92 | else |
| 93 | ret = open(buf, O_RDONLY, 0); |
| 94 | |
| 95 | if (ret < 0) |
| 96 | ret = -errno; |
| 97 | } |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static int open_kprobe_events(bool readwrite) |
| 102 | { |
Naveen N. Rao | e491bc2 | 2017-02-23 17:07:23 +0530 | [diff] [blame] | 103 | return open_trace_file("kprobe_events", readwrite); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | static int open_uprobe_events(bool readwrite) |
| 107 | { |
Naveen N. Rao | e491bc2 | 2017-02-23 17:07:23 +0530 | [diff] [blame] | 108 | return open_trace_file("uprobe_events", readwrite); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | int probe_file__open(int flag) |
| 112 | { |
| 113 | int fd; |
| 114 | |
| 115 | if (flag & PF_FL_UPROBE) |
| 116 | fd = open_uprobe_events(flag & PF_FL_RW); |
| 117 | else |
| 118 | fd = open_kprobe_events(flag & PF_FL_RW); |
| 119 | if (fd < 0) |
| 120 | print_open_warning(fd, flag & PF_FL_UPROBE); |
| 121 | |
| 122 | return fd; |
| 123 | } |
| 124 | |
| 125 | int probe_file__open_both(int *kfd, int *ufd, int flag) |
| 126 | { |
| 127 | if (!kfd || !ufd) |
| 128 | return -EINVAL; |
| 129 | |
| 130 | *kfd = open_kprobe_events(flag & PF_FL_RW); |
| 131 | *ufd = open_uprobe_events(flag & PF_FL_RW); |
| 132 | if (*kfd < 0 && *ufd < 0) { |
| 133 | print_both_open_warning(*kfd, *ufd); |
| 134 | return *kfd; |
| 135 | } |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* Get raw string list of current kprobe_events or uprobe_events */ |
| 141 | struct strlist *probe_file__get_rawlist(int fd) |
| 142 | { |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 143 | int ret, idx, fddup; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 144 | FILE *fp; |
| 145 | char buf[MAX_CMDLEN]; |
| 146 | char *p; |
| 147 | struct strlist *sl; |
| 148 | |
Wang Nan | 421fd08 | 2015-11-06 09:50:15 +0000 | [diff] [blame] | 149 | if (fd < 0) |
| 150 | return NULL; |
| 151 | |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 152 | sl = strlist__new(NULL, NULL); |
Arnaldo Carvalho de Melo | 60ebc15 | 2016-08-15 17:06:47 -0300 | [diff] [blame] | 153 | if (sl == NULL) |
| 154 | return NULL; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 155 | |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 156 | fddup = dup(fd); |
| 157 | if (fddup < 0) |
| 158 | goto out_free_sl; |
| 159 | |
| 160 | fp = fdopen(fddup, "r"); |
| 161 | if (!fp) |
| 162 | goto out_close_fddup; |
| 163 | |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 164 | while (!feof(fp)) { |
| 165 | p = fgets(buf, MAX_CMDLEN, fp); |
| 166 | if (!p) |
| 167 | break; |
| 168 | |
| 169 | idx = strlen(p) - 1; |
| 170 | if (p[idx] == '\n') |
| 171 | p[idx] = '\0'; |
| 172 | ret = strlist__add(sl, buf); |
| 173 | if (ret < 0) { |
| 174 | pr_debug("strlist__add failed (%d)\n", ret); |
Arnaldo Carvalho de Melo | 60ebc15 | 2016-08-15 17:06:47 -0300 | [diff] [blame] | 175 | goto out_close_fp; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 176 | } |
| 177 | } |
| 178 | fclose(fp); |
| 179 | |
| 180 | return sl; |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 181 | |
Arnaldo Carvalho de Melo | 60ebc15 | 2016-08-15 17:06:47 -0300 | [diff] [blame] | 182 | out_close_fp: |
| 183 | fclose(fp); |
| 184 | goto out_free_sl; |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 185 | out_close_fddup: |
| 186 | close(fddup); |
| 187 | out_free_sl: |
| 188 | strlist__delete(sl); |
| 189 | return NULL; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static struct strlist *__probe_file__get_namelist(int fd, bool include_group) |
| 193 | { |
| 194 | char buf[128]; |
| 195 | struct strlist *sl, *rawlist; |
| 196 | struct str_node *ent; |
| 197 | struct probe_trace_event tev; |
| 198 | int ret = 0; |
| 199 | |
| 200 | memset(&tev, 0, sizeof(tev)); |
| 201 | rawlist = probe_file__get_rawlist(fd); |
| 202 | if (!rawlist) |
| 203 | return NULL; |
| 204 | sl = strlist__new(NULL, NULL); |
Arnaldo Carvalho de Melo | 602a1f4 | 2016-06-23 11:31:20 -0300 | [diff] [blame] | 205 | strlist__for_each_entry(ent, rawlist) { |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 206 | ret = parse_probe_trace_command(ent->s, &tev); |
| 207 | if (ret < 0) |
| 208 | break; |
| 209 | if (include_group) { |
| 210 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
| 211 | tev.event); |
| 212 | if (ret >= 0) |
| 213 | ret = strlist__add(sl, buf); |
| 214 | } else |
| 215 | ret = strlist__add(sl, tev.event); |
| 216 | clear_probe_trace_event(&tev); |
| 217 | if (ret < 0) |
| 218 | break; |
| 219 | } |
| 220 | strlist__delete(rawlist); |
| 221 | |
| 222 | if (ret < 0) { |
| 223 | strlist__delete(sl); |
| 224 | return NULL; |
| 225 | } |
| 226 | return sl; |
| 227 | } |
| 228 | |
| 229 | /* Get current perf-probe event names */ |
| 230 | struct strlist *probe_file__get_namelist(int fd) |
| 231 | { |
| 232 | return __probe_file__get_namelist(fd, false); |
| 233 | } |
| 234 | |
| 235 | int probe_file__add_event(int fd, struct probe_trace_event *tev) |
| 236 | { |
| 237 | int ret = 0; |
| 238 | char *buf = synthesize_probe_trace_command(tev); |
| 239 | char sbuf[STRERR_BUFSIZE]; |
| 240 | |
| 241 | if (!buf) { |
| 242 | pr_debug("Failed to synthesize probe trace event.\n"); |
| 243 | return -EINVAL; |
| 244 | } |
| 245 | |
| 246 | pr_debug("Writing event: %s\n", buf); |
| 247 | if (!probe_event_dry_run) { |
Masami Hiramatsu | 6ed0720 | 2016-04-26 18:03:04 +0900 | [diff] [blame] | 248 | if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) { |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 249 | ret = -errno; |
| 250 | pr_warning("Failed to write event: %s\n", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 251 | str_error_r(errno, sbuf, sizeof(sbuf))); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | free(buf); |
| 255 | |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
| 260 | { |
| 261 | char *p; |
| 262 | char buf[128]; |
| 263 | int ret; |
| 264 | |
| 265 | /* Convert from perf-probe event to trace-probe event */ |
| 266 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
| 267 | if (ret < 0) |
| 268 | goto error; |
| 269 | |
| 270 | p = strchr(buf + 2, ':'); |
| 271 | if (!p) { |
| 272 | pr_debug("Internal error: %s should have ':' but not.\n", |
| 273 | ent->s); |
| 274 | ret = -ENOTSUP; |
| 275 | goto error; |
| 276 | } |
| 277 | *p = '/'; |
| 278 | |
| 279 | pr_debug("Writing event: %s\n", buf); |
| 280 | ret = write(fd, buf, strlen(buf)); |
| 281 | if (ret < 0) { |
| 282 | ret = -errno; |
| 283 | goto error; |
| 284 | } |
| 285 | |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 286 | return 0; |
| 287 | error: |
| 288 | pr_warning("Failed to delete event: %s\n", |
Arnaldo Carvalho de Melo | c8b5f2c | 2016-07-06 11:56:20 -0300 | [diff] [blame] | 289 | str_error_r(-ret, buf, sizeof(buf))); |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 290 | return ret; |
| 291 | } |
| 292 | |
Namhyung Kim | e607f14 | 2015-09-04 21:16:03 +0900 | [diff] [blame] | 293 | int probe_file__get_events(int fd, struct strfilter *filter, |
| 294 | struct strlist *plist) |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 295 | { |
| 296 | struct strlist *namelist; |
| 297 | struct str_node *ent; |
| 298 | const char *p; |
| 299 | int ret = -ENOENT; |
| 300 | |
Wang Nan | 421fd08 | 2015-11-06 09:50:15 +0000 | [diff] [blame] | 301 | if (!plist) |
| 302 | return -EINVAL; |
| 303 | |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 304 | namelist = __probe_file__get_namelist(fd, true); |
| 305 | if (!namelist) |
| 306 | return -ENOENT; |
| 307 | |
Arnaldo Carvalho de Melo | 602a1f4 | 2016-06-23 11:31:20 -0300 | [diff] [blame] | 308 | strlist__for_each_entry(ent, namelist) { |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 309 | p = strchr(ent->s, ':'); |
| 310 | if ((p && strfilter__compare(filter, p + 1)) || |
| 311 | strfilter__compare(filter, ent->s)) { |
Namhyung Kim | e7895e4 | 2015-09-04 21:16:02 +0900 | [diff] [blame] | 312 | strlist__add(plist, ent->s); |
| 313 | ret = 0; |
Masami Hiramatsu | 92f6c72 | 2015-07-15 18:14:07 +0900 | [diff] [blame] | 314 | } |
| 315 | } |
| 316 | strlist__delete(namelist); |
| 317 | |
| 318 | return ret; |
| 319 | } |
Namhyung Kim | e7895e4 | 2015-09-04 21:16:02 +0900 | [diff] [blame] | 320 | |
Namhyung Kim | e607f14 | 2015-09-04 21:16:03 +0900 | [diff] [blame] | 321 | int probe_file__del_strlist(int fd, struct strlist *namelist) |
Namhyung Kim | e7895e4 | 2015-09-04 21:16:02 +0900 | [diff] [blame] | 322 | { |
| 323 | int ret = 0; |
| 324 | struct str_node *ent; |
| 325 | |
Arnaldo Carvalho de Melo | 602a1f4 | 2016-06-23 11:31:20 -0300 | [diff] [blame] | 326 | strlist__for_each_entry(ent, namelist) { |
Namhyung Kim | e7895e4 | 2015-09-04 21:16:02 +0900 | [diff] [blame] | 327 | ret = __del_trace_probe_event(fd, ent); |
| 328 | if (ret < 0) |
| 329 | break; |
| 330 | } |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | int probe_file__del_events(int fd, struct strfilter *filter) |
| 335 | { |
| 336 | struct strlist *namelist; |
| 337 | int ret; |
| 338 | |
| 339 | namelist = strlist__new(NULL, NULL); |
| 340 | if (!namelist) |
| 341 | return -ENOMEM; |
| 342 | |
| 343 | ret = probe_file__get_events(fd, filter, namelist); |
| 344 | if (ret < 0) |
| 345 | return ret; |
| 346 | |
| 347 | ret = probe_file__del_strlist(fd, namelist); |
| 348 | strlist__delete(namelist); |
| 349 | |
| 350 | return ret; |
| 351 | } |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 352 | |
| 353 | /* Caller must ensure to remove this entry from list */ |
| 354 | static void probe_cache_entry__delete(struct probe_cache_entry *entry) |
| 355 | { |
| 356 | if (entry) { |
| 357 | BUG_ON(!list_empty(&entry->node)); |
| 358 | |
| 359 | strlist__delete(entry->tevlist); |
| 360 | clear_perf_probe_event(&entry->pev); |
| 361 | zfree(&entry->spev); |
| 362 | free(entry); |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | static struct probe_cache_entry * |
| 367 | probe_cache_entry__new(struct perf_probe_event *pev) |
| 368 | { |
| 369 | struct probe_cache_entry *entry = zalloc(sizeof(*entry)); |
| 370 | |
| 371 | if (entry) { |
| 372 | INIT_LIST_HEAD(&entry->node); |
| 373 | entry->tevlist = strlist__new(NULL, NULL); |
| 374 | if (!entry->tevlist) |
| 375 | zfree(&entry); |
| 376 | else if (pev) { |
| 377 | entry->spev = synthesize_perf_probe_command(pev); |
| 378 | if (!entry->spev || |
| 379 | perf_probe_event__copy(&entry->pev, pev) < 0) { |
| 380 | probe_cache_entry__delete(entry); |
| 381 | return NULL; |
| 382 | } |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | return entry; |
| 387 | } |
| 388 | |
Masami Hiramatsu | 42bba26 | 2016-07-12 19:05:18 +0900 | [diff] [blame] | 389 | int probe_cache_entry__get_event(struct probe_cache_entry *entry, |
| 390 | struct probe_trace_event **tevs) |
| 391 | { |
| 392 | struct probe_trace_event *tev; |
| 393 | struct str_node *node; |
| 394 | int ret, i; |
| 395 | |
| 396 | ret = strlist__nr_entries(entry->tevlist); |
| 397 | if (ret > probe_conf.max_probes) |
| 398 | return -E2BIG; |
| 399 | |
| 400 | *tevs = zalloc(ret * sizeof(*tev)); |
| 401 | if (!*tevs) |
| 402 | return -ENOMEM; |
| 403 | |
| 404 | i = 0; |
| 405 | strlist__for_each_entry(node, entry->tevlist) { |
| 406 | tev = &(*tevs)[i++]; |
| 407 | ret = parse_probe_trace_command(node->s, tev); |
| 408 | if (ret < 0) |
| 409 | break; |
| 410 | } |
| 411 | return i; |
| 412 | } |
| 413 | |
| 414 | /* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */ |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 415 | static int probe_cache__open(struct probe_cache *pcache, const char *target) |
| 416 | { |
| 417 | char cpath[PATH_MAX]; |
| 418 | char sbuildid[SBUILD_ID_SIZE]; |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 419 | char *dir_name = NULL; |
Masami Hiramatsu | 42bba26 | 2016-07-12 19:05:18 +0900 | [diff] [blame] | 420 | bool is_kallsyms = false; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 421 | int ret, fd; |
| 422 | |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 423 | if (target && build_id_cache__cached(target)) { |
| 424 | /* This is a cached buildid */ |
| 425 | strncpy(sbuildid, target, SBUILD_ID_SIZE); |
| 426 | dir_name = build_id_cache__linkname(sbuildid, NULL, 0); |
| 427 | goto found; |
| 428 | } |
| 429 | |
Masami Hiramatsu | 42bba26 | 2016-07-12 19:05:18 +0900 | [diff] [blame] | 430 | if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) { |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 431 | target = DSO__NAME_KALLSYMS; |
Masami Hiramatsu | 42bba26 | 2016-07-12 19:05:18 +0900 | [diff] [blame] | 432 | is_kallsyms = true; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 433 | ret = sysfs__sprintf_build_id("/", sbuildid); |
Masami Hiramatsu | 42bba26 | 2016-07-12 19:05:18 +0900 | [diff] [blame] | 434 | } else |
| 435 | ret = filename__sprintf_build_id(target, sbuildid); |
| 436 | |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 437 | if (ret < 0) { |
| 438 | pr_debug("Failed to get build-id from %s.\n", target); |
| 439 | return ret; |
| 440 | } |
| 441 | |
| 442 | /* If we have no buildid cache, make it */ |
| 443 | if (!build_id_cache__cached(sbuildid)) { |
| 444 | ret = build_id_cache__add_s(sbuildid, target, |
| 445 | is_kallsyms, NULL); |
| 446 | if (ret < 0) { |
| 447 | pr_debug("Failed to add build-id cache: %s\n", target); |
| 448 | return ret; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms, |
| 453 | false); |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 454 | found: |
| 455 | if (!dir_name) { |
| 456 | pr_debug("Failed to get cache from %s\n", target); |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 457 | return -ENOMEM; |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 458 | } |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 459 | |
| 460 | snprintf(cpath, PATH_MAX, "%s/probes", dir_name); |
| 461 | fd = open(cpath, O_CREAT | O_RDWR, 0644); |
| 462 | if (fd < 0) |
| 463 | pr_debug("Failed to open cache(%d): %s\n", fd, cpath); |
| 464 | free(dir_name); |
| 465 | pcache->fd = fd; |
| 466 | |
| 467 | return fd; |
| 468 | } |
| 469 | |
| 470 | static int probe_cache__load(struct probe_cache *pcache) |
| 471 | { |
| 472 | struct probe_cache_entry *entry = NULL; |
| 473 | char buf[MAX_CMDLEN], *p; |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 474 | int ret = 0, fddup; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 475 | FILE *fp; |
| 476 | |
Colin Ian King | 0325862 | 2016-08-12 22:44:56 +0100 | [diff] [blame] | 477 | fddup = dup(pcache->fd); |
| 478 | if (fddup < 0) |
| 479 | return -errno; |
| 480 | fp = fdopen(fddup, "r"); |
Arnaldo Carvalho de Melo | 60ebc15 | 2016-08-15 17:06:47 -0300 | [diff] [blame] | 481 | if (!fp) { |
| 482 | close(fddup); |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 483 | return -EINVAL; |
Arnaldo Carvalho de Melo | 60ebc15 | 2016-08-15 17:06:47 -0300 | [diff] [blame] | 484 | } |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 485 | |
| 486 | while (!feof(fp)) { |
| 487 | if (!fgets(buf, MAX_CMDLEN, fp)) |
| 488 | break; |
| 489 | p = strchr(buf, '\n'); |
| 490 | if (p) |
| 491 | *p = '\0'; |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 492 | /* #perf_probe_event or %sdt_event */ |
| 493 | if (buf[0] == '#' || buf[0] == '%') { |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 494 | entry = probe_cache_entry__new(NULL); |
| 495 | if (!entry) { |
| 496 | ret = -ENOMEM; |
| 497 | goto out; |
| 498 | } |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 499 | if (buf[0] == '%') |
| 500 | entry->sdt = true; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 501 | entry->spev = strdup(buf + 1); |
| 502 | if (entry->spev) |
| 503 | ret = parse_perf_probe_command(buf + 1, |
| 504 | &entry->pev); |
| 505 | else |
| 506 | ret = -ENOMEM; |
| 507 | if (ret < 0) { |
| 508 | probe_cache_entry__delete(entry); |
| 509 | goto out; |
| 510 | } |
| 511 | list_add_tail(&entry->node, &pcache->entries); |
| 512 | } else { /* trace_probe_event */ |
| 513 | if (!entry) { |
| 514 | ret = -EINVAL; |
| 515 | goto out; |
| 516 | } |
| 517 | strlist__add(entry->tevlist, buf); |
| 518 | } |
| 519 | } |
| 520 | out: |
| 521 | fclose(fp); |
| 522 | return ret; |
| 523 | } |
| 524 | |
| 525 | static struct probe_cache *probe_cache__alloc(void) |
| 526 | { |
| 527 | struct probe_cache *pcache = zalloc(sizeof(*pcache)); |
| 528 | |
| 529 | if (pcache) { |
| 530 | INIT_LIST_HEAD(&pcache->entries); |
| 531 | pcache->fd = -EINVAL; |
| 532 | } |
| 533 | return pcache; |
| 534 | } |
| 535 | |
| 536 | void probe_cache__purge(struct probe_cache *pcache) |
| 537 | { |
| 538 | struct probe_cache_entry *entry, *n; |
| 539 | |
| 540 | list_for_each_entry_safe(entry, n, &pcache->entries, node) { |
| 541 | list_del_init(&entry->node); |
| 542 | probe_cache_entry__delete(entry); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | void probe_cache__delete(struct probe_cache *pcache) |
| 547 | { |
| 548 | if (!pcache) |
| 549 | return; |
| 550 | |
| 551 | probe_cache__purge(pcache); |
| 552 | if (pcache->fd > 0) |
| 553 | close(pcache->fd); |
| 554 | free(pcache); |
| 555 | } |
| 556 | |
| 557 | struct probe_cache *probe_cache__new(const char *target) |
| 558 | { |
| 559 | struct probe_cache *pcache = probe_cache__alloc(); |
| 560 | int ret; |
| 561 | |
| 562 | if (!pcache) |
| 563 | return NULL; |
| 564 | |
| 565 | ret = probe_cache__open(pcache, target); |
| 566 | if (ret < 0) { |
| 567 | pr_debug("Cache open error: %d\n", ret); |
| 568 | goto out_err; |
| 569 | } |
| 570 | |
| 571 | ret = probe_cache__load(pcache); |
| 572 | if (ret < 0) { |
| 573 | pr_debug("Cache read error: %d\n", ret); |
| 574 | goto out_err; |
| 575 | } |
| 576 | |
| 577 | return pcache; |
| 578 | |
| 579 | out_err: |
| 580 | probe_cache__delete(pcache); |
| 581 | return NULL; |
| 582 | } |
| 583 | |
| 584 | static bool streql(const char *a, const char *b) |
| 585 | { |
| 586 | if (a == b) |
| 587 | return true; |
| 588 | |
| 589 | if (!a || !b) |
| 590 | return false; |
| 591 | |
| 592 | return !strcmp(a, b); |
| 593 | } |
| 594 | |
Masami Hiramatsu | bc06223 | 2016-07-01 17:03:12 +0900 | [diff] [blame] | 595 | struct probe_cache_entry * |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 596 | probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev) |
| 597 | { |
| 598 | struct probe_cache_entry *entry = NULL; |
| 599 | char *cmd = synthesize_perf_probe_command(pev); |
| 600 | |
| 601 | if (!cmd) |
| 602 | return NULL; |
| 603 | |
Masami Hiramatsu | 05bf2c8 | 2016-07-12 19:05:04 +0900 | [diff] [blame] | 604 | for_each_probe_cache_entry(entry, pcache) { |
Masami Hiramatsu | 36a009f | 2016-07-12 19:04:43 +0900 | [diff] [blame] | 605 | if (pev->sdt) { |
| 606 | if (entry->pev.event && |
| 607 | streql(entry->pev.event, pev->event) && |
| 608 | (!pev->group || |
| 609 | streql(entry->pev.group, pev->group))) |
| 610 | goto found; |
| 611 | |
| 612 | continue; |
| 613 | } |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 614 | /* Hit if same event name or same command-string */ |
| 615 | if ((pev->event && |
| 616 | (streql(entry->pev.group, pev->group) && |
| 617 | streql(entry->pev.event, pev->event))) || |
| 618 | (!strcmp(entry->spev, cmd))) |
| 619 | goto found; |
| 620 | } |
| 621 | entry = NULL; |
| 622 | |
| 623 | found: |
| 624 | free(cmd); |
| 625 | return entry; |
| 626 | } |
| 627 | |
Masami Hiramatsu | bc06223 | 2016-07-01 17:03:12 +0900 | [diff] [blame] | 628 | struct probe_cache_entry * |
| 629 | probe_cache__find_by_name(struct probe_cache *pcache, |
| 630 | const char *group, const char *event) |
| 631 | { |
| 632 | struct probe_cache_entry *entry = NULL; |
| 633 | |
Masami Hiramatsu | 05bf2c8 | 2016-07-12 19:05:04 +0900 | [diff] [blame] | 634 | for_each_probe_cache_entry(entry, pcache) { |
Masami Hiramatsu | bc06223 | 2016-07-01 17:03:12 +0900 | [diff] [blame] | 635 | /* Hit if same event name or same command-string */ |
| 636 | if (streql(entry->pev.group, group) && |
| 637 | streql(entry->pev.event, event)) |
| 638 | goto found; |
| 639 | } |
| 640 | entry = NULL; |
| 641 | |
| 642 | found: |
| 643 | return entry; |
| 644 | } |
| 645 | |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 646 | int probe_cache__add_entry(struct probe_cache *pcache, |
| 647 | struct perf_probe_event *pev, |
| 648 | struct probe_trace_event *tevs, int ntevs) |
| 649 | { |
| 650 | struct probe_cache_entry *entry = NULL; |
| 651 | char *command; |
| 652 | int i, ret = 0; |
| 653 | |
| 654 | if (!pcache || !pev || !tevs || ntevs <= 0) { |
| 655 | ret = -EINVAL; |
| 656 | goto out_err; |
| 657 | } |
| 658 | |
| 659 | /* Remove old cache entry */ |
| 660 | entry = probe_cache__find(pcache, pev); |
| 661 | if (entry) { |
| 662 | list_del_init(&entry->node); |
| 663 | probe_cache_entry__delete(entry); |
| 664 | } |
| 665 | |
| 666 | ret = -ENOMEM; |
| 667 | entry = probe_cache_entry__new(pev); |
| 668 | if (!entry) |
| 669 | goto out_err; |
| 670 | |
| 671 | for (i = 0; i < ntevs; i++) { |
| 672 | if (!tevs[i].point.symbol) |
| 673 | continue; |
| 674 | |
| 675 | command = synthesize_probe_trace_command(&tevs[i]); |
| 676 | if (!command) |
| 677 | goto out_err; |
| 678 | strlist__add(entry->tevlist, command); |
| 679 | free(command); |
| 680 | } |
| 681 | list_add_tail(&entry->node, &pcache->entries); |
| 682 | pr_debug("Added probe cache: %d\n", ntevs); |
| 683 | return 0; |
| 684 | |
| 685 | out_err: |
| 686 | pr_debug("Failed to add probe caches\n"); |
| 687 | probe_cache_entry__delete(entry); |
| 688 | return ret; |
| 689 | } |
| 690 | |
Arnaldo Carvalho de Melo | 1c1a3a4 | 2016-07-12 12:19:09 -0300 | [diff] [blame] | 691 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 692 | static unsigned long long sdt_note__get_addr(struct sdt_note *note) |
| 693 | { |
| 694 | return note->bit32 ? (unsigned long long)note->addr.a32[0] |
| 695 | : (unsigned long long)note->addr.a64[0]; |
| 696 | } |
| 697 | |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 698 | static const char * const type_to_suffix[] = { |
| 699 | ":s64", "", "", "", ":s32", "", ":s16", ":s8", |
| 700 | "", ":u8", ":u16", "", ":u32", "", "", "", ":u64" |
| 701 | }; |
| 702 | |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 703 | /* |
| 704 | * Isolate the string number and convert it into a decimal value; |
| 705 | * this will be an index to get suffix of the uprobe name (defining |
| 706 | * the type) |
| 707 | */ |
| 708 | static int sdt_arg_parse_size(char *n_ptr, const char **suffix) |
| 709 | { |
| 710 | long type_idx; |
| 711 | |
| 712 | type_idx = strtol(n_ptr, NULL, 10); |
| 713 | if (type_idx < -8 || type_idx > 8) { |
| 714 | pr_debug4("Failed to get a valid sdt type\n"); |
| 715 | return -1; |
| 716 | } |
| 717 | |
| 718 | *suffix = type_to_suffix[type_idx + 8]; |
| 719 | return 0; |
| 720 | } |
| 721 | |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 722 | static int synthesize_sdt_probe_arg(struct strbuf *buf, int i, const char *arg) |
| 723 | { |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 724 | char *op, *desc = strdup(arg), *new_op = NULL; |
| 725 | const char *suffix = ""; |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 726 | int ret = -1; |
| 727 | |
| 728 | if (desc == NULL) { |
| 729 | pr_debug4("Allocation error\n"); |
| 730 | return ret; |
| 731 | } |
| 732 | |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 733 | /* |
| 734 | * Argument is in N@OP format. N is size of the argument and OP is |
| 735 | * the actual assembly operand. N can be omitted; in that case |
| 736 | * argument is just OP(without @). |
| 737 | */ |
| 738 | op = strchr(desc, '@'); |
| 739 | if (op) { |
| 740 | op[0] = '\0'; |
| 741 | op++; |
| 742 | |
| 743 | if (sdt_arg_parse_size(desc, &suffix)) |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 744 | goto error; |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 745 | } else { |
| 746 | op = desc; |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 747 | } |
| 748 | |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 749 | ret = arch_sdt_arg_parse_op(op, &new_op); |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 750 | |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 751 | if (ret < 0) |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 752 | goto error; |
| 753 | |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 754 | if (ret == SDT_ARG_VALID) { |
| 755 | ret = strbuf_addf(buf, " arg%d=%s%s", i + 1, new_op, suffix); |
| 756 | if (ret < 0) |
| 757 | goto error; |
| 758 | } |
| 759 | |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 760 | ret = 0; |
| 761 | error: |
| 762 | free(desc); |
Ravi Bangoria | d451a20 | 2017-03-28 15:17:53 +0530 | [diff] [blame] | 763 | free(new_op); |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 764 | return ret; |
| 765 | } |
| 766 | |
| 767 | static char *synthesize_sdt_probe_command(struct sdt_note *note, |
| 768 | const char *pathname, |
| 769 | const char *sdtgrp) |
| 770 | { |
| 771 | struct strbuf buf; |
| 772 | char *ret = NULL, **args; |
| 773 | int i, args_count; |
| 774 | |
| 775 | if (strbuf_init(&buf, 32) < 0) |
| 776 | return NULL; |
| 777 | |
| 778 | if (strbuf_addf(&buf, "p:%s/%s %s:0x%llx", |
| 779 | sdtgrp, note->name, pathname, |
| 780 | sdt_note__get_addr(note)) < 0) |
| 781 | goto error; |
| 782 | |
| 783 | if (!note->args) |
| 784 | goto out; |
| 785 | |
| 786 | if (note->args) { |
| 787 | args = argv_split(note->args, &args_count); |
| 788 | |
| 789 | for (i = 0; i < args_count; ++i) { |
| 790 | if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0) |
| 791 | goto error; |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | out: |
| 796 | ret = strbuf_detach(&buf, NULL); |
| 797 | error: |
| 798 | strbuf_release(&buf); |
| 799 | return ret; |
| 800 | } |
| 801 | |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 802 | int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) |
| 803 | { |
| 804 | struct probe_cache_entry *entry = NULL; |
| 805 | struct list_head sdtlist; |
| 806 | struct sdt_note *note; |
| 807 | char *buf; |
| 808 | char sdtgrp[64]; |
| 809 | int ret; |
| 810 | |
| 811 | INIT_LIST_HEAD(&sdtlist); |
| 812 | ret = get_sdt_note_list(&sdtlist, pathname); |
| 813 | if (ret < 0) { |
Adrian Hunter | f965520 | 2016-09-23 17:38:40 +0300 | [diff] [blame] | 814 | pr_debug4("Failed to get sdt note: %d\n", ret); |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 815 | return ret; |
| 816 | } |
| 817 | list_for_each_entry(note, &sdtlist, note_list) { |
| 818 | ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider); |
| 819 | if (ret < 0) |
| 820 | break; |
| 821 | /* Try to find same-name entry */ |
| 822 | entry = probe_cache__find_by_name(pcache, sdtgrp, note->name); |
| 823 | if (!entry) { |
| 824 | entry = probe_cache_entry__new(NULL); |
| 825 | if (!entry) { |
| 826 | ret = -ENOMEM; |
| 827 | break; |
| 828 | } |
| 829 | entry->sdt = true; |
| 830 | ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp, |
| 831 | note->name, note->name); |
| 832 | if (ret < 0) |
| 833 | break; |
| 834 | entry->pev.event = strdup(note->name); |
| 835 | entry->pev.group = strdup(sdtgrp); |
| 836 | list_add_tail(&entry->node, &pcache->entries); |
| 837 | } |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 838 | buf = synthesize_sdt_probe_command(note, pathname, sdtgrp); |
| 839 | if (!buf) { |
| 840 | ret = -ENOMEM; |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 841 | break; |
Alexis Berlemont | 3b1f831 | 2016-12-14 01:07:32 +0100 | [diff] [blame] | 842 | } |
| 843 | |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 844 | strlist__add(entry->tevlist, buf); |
| 845 | free(buf); |
| 846 | entry = NULL; |
| 847 | } |
| 848 | if (entry) { |
| 849 | list_del_init(&entry->node); |
| 850 | probe_cache_entry__delete(entry); |
| 851 | } |
| 852 | cleanup_sdt_note_list(&sdtlist); |
| 853 | return ret; |
| 854 | } |
Arnaldo Carvalho de Melo | 1c1a3a4 | 2016-07-12 12:19:09 -0300 | [diff] [blame] | 855 | #endif |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 856 | |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 857 | static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd) |
| 858 | { |
| 859 | struct str_node *snode; |
| 860 | struct stat st; |
| 861 | struct iovec iov[3]; |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 862 | const char *prefix = entry->sdt ? "%" : "#"; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 863 | int ret; |
| 864 | /* Save stat for rollback */ |
| 865 | ret = fstat(fd, &st); |
| 866 | if (ret < 0) |
| 867 | return ret; |
| 868 | |
Masami Hiramatsu | 6430a94e | 2016-07-01 17:04:10 +0900 | [diff] [blame] | 869 | pr_debug("Writing cache: %s%s\n", prefix, entry->spev); |
| 870 | iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1; |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 871 | iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev); |
| 872 | iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1; |
| 873 | ret = writev(fd, iov, 3); |
| 874 | if (ret < (int)iov[1].iov_len + 2) |
| 875 | goto rollback; |
| 876 | |
Arnaldo Carvalho de Melo | 602a1f4 | 2016-06-23 11:31:20 -0300 | [diff] [blame] | 877 | strlist__for_each_entry(snode, entry->tevlist) { |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 878 | iov[0].iov_base = (void *)snode->s; |
| 879 | iov[0].iov_len = strlen(snode->s); |
| 880 | iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1; |
| 881 | ret = writev(fd, iov, 2); |
| 882 | if (ret < (int)iov[0].iov_len + 1) |
| 883 | goto rollback; |
| 884 | } |
| 885 | return 0; |
| 886 | |
| 887 | rollback: |
| 888 | /* Rollback to avoid cache file corruption */ |
| 889 | if (ret > 0) |
| 890 | ret = -1; |
| 891 | if (ftruncate(fd, st.st_size) < 0) |
| 892 | ret = -2; |
| 893 | |
| 894 | return ret; |
| 895 | } |
| 896 | |
| 897 | int probe_cache__commit(struct probe_cache *pcache) |
| 898 | { |
| 899 | struct probe_cache_entry *entry; |
| 900 | int ret = 0; |
| 901 | |
| 902 | /* TBD: if we do not update existing entries, skip it */ |
| 903 | ret = lseek(pcache->fd, 0, SEEK_SET); |
| 904 | if (ret < 0) |
| 905 | goto out; |
| 906 | |
| 907 | ret = ftruncate(pcache->fd, 0); |
| 908 | if (ret < 0) |
| 909 | goto out; |
| 910 | |
Masami Hiramatsu | 05bf2c8 | 2016-07-12 19:05:04 +0900 | [diff] [blame] | 911 | for_each_probe_cache_entry(entry, pcache) { |
Masami Hiramatsu | dd97549 | 2016-06-15 12:28:30 +0900 | [diff] [blame] | 912 | ret = probe_cache_entry__write(entry, pcache->fd); |
| 913 | pr_debug("Cache committed: %d\n", ret); |
| 914 | if (ret < 0) |
| 915 | break; |
| 916 | } |
| 917 | out: |
| 918 | return ret; |
| 919 | } |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 920 | |
Masami Hiramatsu | 4a0f65c | 2016-07-01 17:03:36 +0900 | [diff] [blame] | 921 | static bool probe_cache_entry__compare(struct probe_cache_entry *entry, |
| 922 | struct strfilter *filter) |
| 923 | { |
| 924 | char buf[128], *ptr = entry->spev; |
| 925 | |
| 926 | if (entry->pev.event) { |
| 927 | snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event); |
| 928 | ptr = buf; |
| 929 | } |
| 930 | return strfilter__compare(filter, ptr); |
| 931 | } |
| 932 | |
| 933 | int probe_cache__filter_purge(struct probe_cache *pcache, |
| 934 | struct strfilter *filter) |
| 935 | { |
| 936 | struct probe_cache_entry *entry, *tmp; |
| 937 | |
| 938 | list_for_each_entry_safe(entry, tmp, &pcache->entries, node) { |
| 939 | if (probe_cache_entry__compare(entry, filter)) { |
| 940 | pr_info("Removed cached event: %s\n", entry->spev); |
| 941 | list_del_init(&entry->node); |
| 942 | probe_cache_entry__delete(entry); |
| 943 | } |
| 944 | } |
| 945 | return 0; |
| 946 | } |
| 947 | |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 948 | static int probe_cache__show_entries(struct probe_cache *pcache, |
| 949 | struct strfilter *filter) |
| 950 | { |
| 951 | struct probe_cache_entry *entry; |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 952 | |
Masami Hiramatsu | 05bf2c8 | 2016-07-12 19:05:04 +0900 | [diff] [blame] | 953 | for_each_probe_cache_entry(entry, pcache) { |
Masami Hiramatsu | 4a0f65c | 2016-07-01 17:03:36 +0900 | [diff] [blame] | 954 | if (probe_cache_entry__compare(entry, filter)) |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 955 | printf("%s\n", entry->spev); |
| 956 | } |
| 957 | return 0; |
| 958 | } |
| 959 | |
| 960 | /* Show all cached probes */ |
| 961 | int probe_cache__show_all_caches(struct strfilter *filter) |
| 962 | { |
| 963 | struct probe_cache *pcache; |
| 964 | struct strlist *bidlist; |
| 965 | struct str_node *nd; |
| 966 | char *buf = strfilter__string(filter); |
| 967 | |
| 968 | pr_debug("list cache with filter: %s\n", buf); |
| 969 | free(buf); |
| 970 | |
Masami Hiramatsu | c3492a3a | 2016-07-12 19:04:54 +0900 | [diff] [blame] | 971 | bidlist = build_id_cache__list_all(true); |
Masami Hiramatsu | 1f3736c | 2016-07-01 17:03:26 +0900 | [diff] [blame] | 972 | if (!bidlist) { |
| 973 | pr_debug("Failed to get buildids: %d\n", errno); |
| 974 | return -EINVAL; |
| 975 | } |
| 976 | strlist__for_each_entry(nd, bidlist) { |
| 977 | pcache = probe_cache__new(nd->s); |
| 978 | if (!pcache) |
| 979 | continue; |
| 980 | if (!list_empty(&pcache->entries)) { |
| 981 | buf = build_id_cache__origname(nd->s); |
| 982 | printf("%s (%s):\n", buf, nd->s); |
| 983 | free(buf); |
| 984 | probe_cache__show_entries(pcache, filter); |
| 985 | } |
| 986 | probe_cache__delete(pcache); |
| 987 | } |
| 988 | strlist__delete(bidlist); |
| 989 | |
| 990 | return 0; |
| 991 | } |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 992 | |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 993 | enum ftrace_readme { |
| 994 | FTRACE_README_PROBE_TYPE_X = 0, |
Naveen N. Rao | 7ab31d9 | 2017-03-08 13:56:09 +0530 | [diff] [blame] | 995 | FTRACE_README_KRETPROBE_OFFSET, |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 996 | FTRACE_README_END, |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 997 | }; |
| 998 | |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 999 | static struct { |
| 1000 | const char *pattern; |
| 1001 | bool avail; |
| 1002 | } ftrace_readme_table[] = { |
| 1003 | #define DEFINE_TYPE(idx, pat) \ |
| 1004 | [idx] = {.pattern = pat, .avail = false} |
| 1005 | DEFINE_TYPE(FTRACE_README_PROBE_TYPE_X, "*type: * x8/16/32/64,*"), |
Naveen N. Rao | 7ab31d9 | 2017-03-08 13:56:09 +0530 | [diff] [blame] | 1006 | DEFINE_TYPE(FTRACE_README_KRETPROBE_OFFSET, "*place (kretprobe): *"), |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1007 | }; |
| 1008 | |
| 1009 | static bool scan_ftrace_readme(enum ftrace_readme type) |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1010 | { |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1011 | int fd; |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1012 | FILE *fp; |
| 1013 | char *buf = NULL; |
| 1014 | size_t len = 0; |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1015 | bool ret = false; |
| 1016 | static bool scanned = false; |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1017 | |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1018 | if (scanned) |
| 1019 | goto result; |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1020 | |
Naveen N. Rao | e491bc2 | 2017-02-23 17:07:23 +0530 | [diff] [blame] | 1021 | fd = open_trace_file("README", false); |
| 1022 | if (fd < 0) |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1023 | return ret; |
| 1024 | |
Naveen N. Rao | e491bc2 | 2017-02-23 17:07:23 +0530 | [diff] [blame] | 1025 | fp = fdopen(fd, "r"); |
| 1026 | if (!fp) { |
| 1027 | close(fd); |
| 1028 | return ret; |
| 1029 | } |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1030 | |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1031 | while (getline(&buf, &len, fp) > 0) |
| 1032 | for (enum ftrace_readme i = 0; i < FTRACE_README_END; i++) |
| 1033 | if (!ftrace_readme_table[i].avail) |
| 1034 | ftrace_readme_table[i].avail = |
| 1035 | strglobmatch(buf, ftrace_readme_table[i].pattern); |
| 1036 | scanned = true; |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1037 | |
| 1038 | fclose(fp); |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1039 | free(buf); |
| 1040 | |
Naveen N. Rao | 3da3ea7 | 2017-03-08 13:56:08 +0530 | [diff] [blame] | 1041 | result: |
| 1042 | if (type >= FTRACE_README_END) |
| 1043 | return false; |
| 1044 | |
| 1045 | return ftrace_readme_table[type].avail; |
| 1046 | } |
| 1047 | |
| 1048 | bool probe_type_is_available(enum probe_type type) |
| 1049 | { |
| 1050 | if (type >= PROBE_TYPE_END) |
| 1051 | return false; |
| 1052 | else if (type == PROBE_TYPE_X) |
| 1053 | return scan_ftrace_readme(FTRACE_README_PROBE_TYPE_X); |
| 1054 | |
| 1055 | return true; |
Masami Hiramatsu | 180b206 | 2016-08-18 17:58:31 +0900 | [diff] [blame] | 1056 | } |
Naveen N. Rao | 7ab31d9 | 2017-03-08 13:56:09 +0530 | [diff] [blame] | 1057 | |
| 1058 | bool kretprobe_offset_is_supported(void) |
| 1059 | { |
| 1060 | return scan_ftrace_readme(FTRACE_README_KRETPROBE_OFFSET); |
| 1061 | } |