Commit | Line | Data |
---|---|---|
096102bd DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com> | |
fbb9748b | 3 | * 2014 - Jan Glauber <jan.glauber@gmail.com> |
096102bd | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
096102bd | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
096102bd | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
096102bd DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
c9d42407 | 21 | #include <assert.h> |
096102bd DG |
22 | #include <stdio.h> |
23 | #include <stdlib.h> | |
24 | #include <sys/wait.h> | |
25 | ||
26 | #include <common/common.h> | |
fbb9748b | 27 | #include <common/utils.h> |
096102bd DG |
28 | |
29 | #include "modprobe.h" | |
30 | #include "kern-modules.h" | |
31 | ||
ab57d7d3 JG |
32 | #define LTTNG_MOD_REQUIRED 1 |
33 | #define LTTNG_MOD_OPTIONAL 0 | |
34 | ||
35 | /* LTTng kernel tracer mandatory core modules list */ | |
36 | struct kern_modules_param kern_modules_control_core[] = { | |
37 | { "lttng-tracer" }, /* MUST be loaded first so keep at top */ | |
38 | { "lttng-lib-ring-buffer" }, | |
39 | { "lttng-ring-buffer-client-discard" }, | |
40 | { "lttng-ring-buffer-client-overwrite" }, | |
41 | { "lttng-ring-buffer-metadata-client" }, | |
42 | { "lttng-ring-buffer-client-mmap-discard" }, | |
43 | { "lttng-ring-buffer-client-mmap-overwrite" }, | |
44 | { "lttng-ring-buffer-metadata-mmap-client" }, | |
45 | }; | |
46 | ||
47 | /* LTTng kernel tracer optional base modules list */ | |
48 | struct kern_modules_param kern_modules_control_opt[] = { | |
49 | { "lttng-types" }, | |
50 | { "lttng-ftrace" }, | |
51 | { "lttng-kprobes" }, | |
52 | { "lttng-kretprobes" }, | |
3fa9646c JG |
53 | }; |
54 | ||
55 | /* LTTng kernel tracer probe modules list */ | |
fbb9748b | 56 | struct kern_modules_param kern_modules_probes_default[] = { |
ab57d7d3 JG |
57 | { "lttng-probe-asoc" }, |
58 | { "lttng-probe-block" }, | |
59 | { "lttng-probe-btrfs" }, | |
60 | { "lttng-probe-compaction" }, | |
61 | { "lttng-probe-ext3" }, | |
62 | { "lttng-probe-ext4" }, | |
63 | { "lttng-probe-gpio" }, | |
64 | { "lttng-probe-irq" }, | |
65 | { "lttng-probe-jbd" }, | |
66 | { "lttng-probe-jbd2" }, | |
67 | { "lttng-probe-kmem" }, | |
68 | { "lttng-probe-kvm" }, | |
69 | { "lttng-probe-kvm-x86" }, | |
70 | { "lttng-probe-kvm-x86-mmu" }, | |
71 | { "lttng-probe-lock" }, | |
72 | { "lttng-probe-module" }, | |
73 | { "lttng-probe-napi" }, | |
74 | { "lttng-probe-net" }, | |
75 | { "lttng-probe-power" }, | |
76 | { "lttng-probe-printk" }, | |
77 | { "lttng-probe-random" }, | |
78 | { "lttng-probe-rcu" }, | |
79 | { "lttng-probe-regmap" }, | |
80 | { "lttng-probe-regulator" }, | |
81 | { "lttng-probe-rpm" }, | |
82 | { "lttng-probe-sched" }, | |
83 | { "lttng-probe-scsi" }, | |
84 | { "lttng-probe-signal" }, | |
85 | { "lttng-probe-skb" }, | |
86 | { "lttng-probe-sock" }, | |
87 | { "lttng-probe-statedump" }, | |
88 | { "lttng-probe-sunrpc" }, | |
89 | { "lttng-probe-timer" }, | |
90 | { "lttng-probe-udp" }, | |
91 | { "lttng-probe-vmscan" }, | |
92 | { "lttng-probe-v4l2" }, | |
93 | { "lttng-probe-workqueue" }, | |
94 | { "lttng-probe-writeback" }, | |
096102bd DG |
95 | }; |
96 | ||
fbb9748b JG |
97 | /* dynamic probe modules list */ |
98 | static struct kern_modules_param *probes; | |
99 | static int nr_probes; | |
c9d42407 | 100 | static int probes_capacity; |
fbb9748b | 101 | |
e6421494 MD |
102 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
103 | int entries, int required) | |
096102bd DG |
104 | { |
105 | int ret = 0, i; | |
106 | char modprobe[256]; | |
107 | ||
e23b81ed | 108 | for (i = entries - 1; i >= 0; i--) { |
096102bd DG |
109 | ret = snprintf(modprobe, sizeof(modprobe), |
110 | "/sbin/modprobe -r -q %s", | |
e23b81ed | 111 | modules[i].name); |
096102bd DG |
112 | if (ret < 0) { |
113 | PERROR("snprintf modprobe -r"); | |
ab57d7d3 | 114 | return; |
096102bd DG |
115 | } |
116 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
117 | ret = system(modprobe); | |
118 | if (ret == -1) { | |
119 | ERR("Unable to launch modprobe -r for module %s", | |
ab57d7d3 JG |
120 | modules[i].name); |
121 | } else if (required && WEXITSTATUS(ret) != 0) { | |
096102bd | 122 | ERR("Unable to remove module %s", |
ab57d7d3 | 123 | modules[i].name); |
096102bd DG |
124 | } else { |
125 | DBG("Modprobe removal successful %s", | |
ab57d7d3 | 126 | modules[i].name); |
096102bd DG |
127 | } |
128 | } | |
e23b81ed JG |
129 | } |
130 | ||
131 | /* | |
132 | * Remove control kernel module(s) in reverse load order. | |
133 | */ | |
134 | void modprobe_remove_lttng_control(void) | |
135 | { | |
ab57d7d3 | 136 | modprobe_remove_lttng(kern_modules_control_opt, |
fbb9748b JG |
137 | ARRAY_SIZE(kern_modules_control_opt), |
138 | LTTNG_MOD_OPTIONAL); | |
ab57d7d3 | 139 | modprobe_remove_lttng(kern_modules_control_core, |
fbb9748b JG |
140 | ARRAY_SIZE(kern_modules_control_core), |
141 | LTTNG_MOD_REQUIRED); | |
096102bd DG |
142 | } |
143 | ||
144 | /* | |
145 | * Remove data kernel modules in reverse load order. | |
146 | */ | |
147 | void modprobe_remove_lttng_data(void) | |
148 | { | |
c9d42407 PP |
149 | int i; |
150 | ||
fbb9748b JG |
151 | if (probes) { |
152 | modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); | |
c9d42407 PP |
153 | |
154 | for (i = 0; i < nr_probes; ++i) { | |
155 | free(probes[i].name); | |
156 | } | |
157 | ||
fbb9748b JG |
158 | free(probes); |
159 | probes = NULL; | |
c9d42407 | 160 | } |
096102bd DG |
161 | } |
162 | ||
163 | /* | |
164 | * Remove all kernel modules in reverse order. | |
165 | */ | |
166 | void modprobe_remove_lttng_all(void) | |
167 | { | |
168 | modprobe_remove_lttng_data(); | |
169 | modprobe_remove_lttng_control(); | |
170 | } | |
171 | ||
234170ac UTL |
172 | #if HAVE_KMOD |
173 | #include <libkmod.h> | |
174 | static void log_kmod(void *data, int priority, const char *file, int line, | |
175 | const char *fn, const char *format, va_list args) | |
176 | { | |
177 | char *str; | |
178 | ||
179 | if (vasprintf(&str, format, args) < 0) { | |
180 | return; | |
181 | } | |
182 | ||
183 | DBG("libkmod: %s", str); | |
184 | free(str); | |
185 | } | |
186 | static int modprobe_lttng(struct kern_modules_param *modules, | |
187 | int entries, int required) | |
188 | { | |
189 | int ret = 0, i; | |
190 | struct kmod_ctx *ctx; | |
191 | ||
192 | ctx = kmod_new(NULL, NULL); | |
193 | if (!ctx) { | |
194 | PERROR("Unable to create kmod library context"); | |
195 | ret = -ENOMEM; | |
196 | goto error; | |
197 | } | |
198 | ||
199 | kmod_set_log_fn(ctx, log_kmod, NULL); | |
200 | kmod_load_resources(ctx); | |
201 | ||
202 | for (i = 0; i < entries; i++) { | |
203 | struct kmod_module *mod = NULL; | |
204 | ||
205 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
206 | if (ret < 0) { | |
207 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
208 | goto error; | |
209 | } | |
210 | ||
211 | ret = kmod_module_probe_insert_module(mod, KMOD_PROBE_IGNORE_LOADED, | |
212 | NULL, NULL, NULL, NULL); | |
16c2e854 PP |
213 | if (ret < 0) { |
214 | if (required) { | |
215 | ERR("Unable to load required module %s", | |
216 | modules[i].name); | |
217 | goto error; | |
218 | } else { | |
219 | DBG("Unable to load optional module %s; continuing", | |
220 | modules[i].name); | |
221 | ret = 0; | |
222 | } | |
234170ac UTL |
223 | } else { |
224 | DBG("Modprobe successfully %s", modules[i].name); | |
225 | } | |
226 | ||
227 | kmod_module_unref(mod); | |
228 | } | |
229 | ||
230 | error: | |
231 | if (ctx) { | |
232 | kmod_unref(ctx); | |
233 | } | |
234 | return ret; | |
235 | } | |
236 | ||
237 | #else /* HAVE_KMOD */ | |
238 | ||
fbb9748b | 239 | static int modprobe_lttng(struct kern_modules_param *modules, |
234170ac | 240 | int entries, int required) |
096102bd DG |
241 | { |
242 | int ret = 0, i; | |
243 | char modprobe[256]; | |
244 | ||
e23b81ed | 245 | for (i = 0; i < entries; i++) { |
096102bd DG |
246 | ret = snprintf(modprobe, sizeof(modprobe), |
247 | "/sbin/modprobe %s%s", | |
ab57d7d3 | 248 | required ? "" : "-q ", |
e23b81ed | 249 | modules[i].name); |
096102bd DG |
250 | if (ret < 0) { |
251 | PERROR("snprintf modprobe"); | |
252 | goto error; | |
253 | } | |
254 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
255 | ret = system(modprobe); | |
256 | if (ret == -1) { | |
16c2e854 PP |
257 | if (required) { |
258 | ERR("Unable to launch modprobe for required module %s", | |
259 | modules[i].name); | |
260 | goto error; | |
261 | } else { | |
262 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
263 | modules[i].name); | |
264 | ret = 0; | |
265 | } | |
266 | } else if (WEXITSTATUS(ret) != 0) { | |
267 | if (required) { | |
268 | ERR("Unable to load required module %s", | |
269 | modules[i].name); | |
270 | goto error; | |
271 | } else { | |
272 | DBG("Unable to load optional module %s; continuing", | |
273 | modules[i].name); | |
274 | ret = 0; | |
275 | } | |
096102bd | 276 | } else { |
ab57d7d3 | 277 | DBG("Modprobe successfully %s", modules[i].name); |
096102bd DG |
278 | } |
279 | } | |
280 | ||
281 | error: | |
282 | return ret; | |
283 | } | |
284 | ||
234170ac UTL |
285 | #endif /* HAVE_KMOD */ |
286 | ||
e23b81ed JG |
287 | /* |
288 | * Load control kernel module(s). | |
289 | */ | |
290 | int modprobe_lttng_control(void) | |
291 | { | |
ab57d7d3 JG |
292 | int ret; |
293 | ||
294 | ret = modprobe_lttng(kern_modules_control_core, | |
295 | ARRAY_SIZE(kern_modules_control_core), | |
296 | LTTNG_MOD_REQUIRED); | |
297 | if (ret != 0) | |
298 | return ret; | |
299 | ret = modprobe_lttng(kern_modules_control_opt, | |
fbb9748b JG |
300 | ARRAY_SIZE(kern_modules_control_opt), |
301 | LTTNG_MOD_OPTIONAL); | |
ab57d7d3 | 302 | return ret; |
e23b81ed | 303 | } |
ab57d7d3 | 304 | |
c9d42407 PP |
305 | /** |
306 | * Grow global list of probes (double capacity or set it to 1 if | |
307 | * currently 0 and copy existing data). | |
096102bd | 308 | */ |
c9d42407 | 309 | static int grow_probes(void) |
096102bd | 310 | { |
c9d42407 PP |
311 | int i; |
312 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 313 | |
c9d42407 PP |
314 | /* Initialize capacity to 1 if 0. */ |
315 | if (probes_capacity == 0) { | |
316 | probes = zmalloc(sizeof(*probes)); | |
317 | if (!probes) { | |
318 | PERROR("malloc probe list"); | |
319 | return -ENOMEM; | |
320 | } | |
321 | ||
322 | probes_capacity = 1; | |
323 | return 0; | |
fbb9748b JG |
324 | } |
325 | ||
c9d42407 PP |
326 | /* Double size. */ |
327 | probes_capacity *= 2; | |
328 | ||
329 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
330 | if (!tmp_probes) { | |
fbb9748b JG |
331 | PERROR("malloc probe list"); |
332 | return -ENOMEM; | |
333 | } | |
334 | ||
c9d42407 PP |
335 | for (i = 0; i < nr_probes; ++i) { |
336 | /* Move name pointer. */ | |
337 | tmp_probes[i].name = probes[i].name; | |
338 | } | |
339 | ||
340 | /* Replace probes with larger copy. */ | |
341 | free(probes); | |
342 | probes = tmp_probes; | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Appends a comma-separated list of probes to the global list | |
349 | * of probes. | |
350 | */ | |
351 | static int append_list_to_probes(const char *list) | |
352 | { | |
353 | char *next; | |
354 | int index = nr_probes, ret; | |
62e0422e | 355 | char *tmp_list; |
c9d42407 PP |
356 | |
357 | assert(list); | |
358 | ||
62e0422e | 359 | tmp_list = strdup(list); |
c9d42407 PP |
360 | if (!tmp_list) { |
361 | PERROR("strdup temp list"); | |
362 | return -ENOMEM; | |
363 | } | |
364 | ||
365 | for (;;) { | |
fbb9748b | 366 | size_t name_len; |
c9d42407 | 367 | struct kern_modules_param *cur_mod; |
fbb9748b | 368 | |
c9d42407 | 369 | next = strtok(tmp_list, ","); |
fbb9748b | 370 | if (!next) { |
c9d42407 | 371 | break; |
fbb9748b | 372 | } |
c9d42407 | 373 | tmp_list = NULL; |
fbb9748b JG |
374 | |
375 | /* filter leading spaces */ | |
376 | while (*next == ' ') { | |
377 | next++; | |
378 | } | |
379 | ||
c9d42407 PP |
380 | if (probes_capacity <= nr_probes) { |
381 | ret = grow_probes(); | |
382 | if (ret) { | |
383 | return ret; | |
384 | } | |
385 | } | |
386 | ||
fbb9748b JG |
387 | /* Length 13 is "lttng-probe-" + \0 */ |
388 | name_len = strlen(next) + 13; | |
389 | ||
c9d42407 PP |
390 | cur_mod = &probes[index]; |
391 | cur_mod->name = zmalloc(name_len); | |
392 | if (!cur_mod->name) { | |
fbb9748b JG |
393 | PERROR("malloc probe list"); |
394 | return -ENOMEM; | |
395 | } | |
396 | ||
c9d42407 | 397 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
398 | if (ret < 0) { |
399 | PERROR("snprintf modprobe name"); | |
c9d42407 | 400 | return -ENOMEM; |
fbb9748b | 401 | } |
c9d42407 PP |
402 | |
403 | cur_mod++; | |
404 | nr_probes++; | |
fbb9748b JG |
405 | } |
406 | ||
c9d42407 PP |
407 | free(tmp_list); |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Load data kernel module(s). | |
414 | */ | |
415 | int modprobe_lttng_data(void) | |
416 | { | |
417 | int ret, i; | |
418 | char *list; | |
419 | ||
420 | /* | |
421 | * Base probes: either from command line option, environment | |
422 | * variable or default list. | |
423 | */ | |
424 | if (kmod_probes_list) { | |
425 | list = kmod_probes_list; | |
426 | } else { | |
427 | list = utils_get_kmod_probes_list(); | |
428 | } | |
429 | ||
430 | if (list) { | |
431 | /* User-specified probes. */ | |
432 | ret = append_list_to_probes(list); | |
433 | ||
434 | if (ret) { | |
435 | return ret; | |
436 | } | |
437 | } else { | |
438 | /* Default probes. */ | |
439 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 440 | |
62e0422e | 441 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
442 | if (!probes) { |
443 | PERROR("malloc probe list"); | |
444 | return -ENOMEM; | |
445 | } | |
446 | ||
447 | nr_probes = probes_capacity = def_len; | |
448 | ||
449 | for (i = 0; i < def_len; ++i) { | |
450 | char* name = strdup(kern_modules_probes_default[i].name); | |
451 | ||
452 | if (!name) { | |
453 | PERROR("strdup probe item"); | |
454 | return -ENOMEM; | |
455 | } | |
456 | ||
457 | probes[i].name = name; | |
458 | } | |
459 | } | |
460 | ||
461 | /* | |
462 | * Extra modules? Append them to current probes list. | |
463 | */ | |
464 | if (kmod_extra_probes_list) { | |
465 | list = kmod_extra_probes_list; | |
466 | } else { | |
467 | list = utils_get_extra_kmod_probes_list(); | |
468 | } | |
469 | ||
470 | if (list) { | |
471 | ret = append_list_to_probes(list); | |
472 | if (ret) { | |
473 | return ret; | |
474 | } | |
475 | } | |
476 | ||
477 | /* | |
478 | * Load probes modules now. | |
479 | */ | |
fbb9748b | 480 | return modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL); |
096102bd | 481 | } |