Commit | Line | Data |
---|---|---|
096102bd | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2014 Jan Glauber <jan.glauber@gmail.com> | |
096102bd | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
096102bd | 6 | * |
096102bd DG |
7 | */ |
8 | ||
d11b2027 MJ |
9 | /** |
10 | * @file modprobe.c | |
11 | * | |
12 | * @brief modprobe related functions. | |
13 | * | |
14 | */ | |
15 | ||
6c1c0768 | 16 | #define _LGPL_SOURCE |
096102bd DG |
17 | #include <stdio.h> |
18 | #include <stdlib.h> | |
19 | #include <sys/wait.h> | |
20 | ||
21 | #include <common/common.h> | |
fbb9748b | 22 | #include <common/utils.h> |
096102bd DG |
23 | |
24 | #include "modprobe.h" | |
25 | #include "kern-modules.h" | |
e6142f2e | 26 | #include "lttng-sessiond.h" |
096102bd | 27 | |
ab57d7d3 JG |
28 | /* LTTng kernel tracer mandatory core modules list */ |
29 | struct kern_modules_param kern_modules_control_core[] = { | |
adfe4f5e JG |
30 | { |
31 | .name = (char *) "lttng-ring-buffer-client-discard", | |
32 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
33 | }, | |
34 | { | |
35 | .name = (char *) "lttng-ring-buffer-client-overwrite", | |
36 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
37 | }, | |
38 | { | |
39 | .name = (char *) "lttng-ring-buffer-metadata-client", | |
40 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
41 | }, | |
42 | { | |
43 | .name = (char *) "lttng-ring-buffer-client-mmap-discard", | |
44 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
45 | }, | |
46 | { | |
47 | .name = (char *) "lttng-ring-buffer-client-mmap-overwrite", | |
48 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
49 | }, | |
50 | { | |
51 | .name = (char *) "lttng-ring-buffer-metadata-mmap-client", | |
52 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
53 | }, | |
87a15032 JR |
54 | { |
55 | .name = (char *) "lttng-ring-buffer-event_notifier-client", | |
56 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
57 | }, | |
90aa04a1 FD |
58 | { |
59 | .name = (char *) "lttng-counter-client-percpu-64-modular", | |
60 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
61 | }, | |
62 | { | |
63 | .name = (char *) "lttng-counter-client-percpu-32-modular", | |
64 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
65 | }, | |
ab57d7d3 JG |
66 | }; |
67 | ||
adfe4f5e | 68 | /* LTTng kerneltracer probe modules list */ |
fbb9748b | 69 | struct kern_modules_param kern_modules_probes_default[] = { |
adfe4f5e JG |
70 | { |
71 | .name = (char *) "lttng-probe-asoc", | |
72 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
73 | }, | |
74 | { | |
75 | .name = (char *) "lttng-probe-block", | |
76 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
77 | }, | |
78 | { | |
79 | .name = (char *) "lttng-probe-btrfs", | |
80 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
81 | }, | |
82 | { | |
83 | .name = (char *) "lttng-probe-compaction", | |
84 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
85 | }, | |
86 | { | |
87 | .name = (char *) "lttng-probe-ext3", | |
88 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
89 | }, | |
90 | { | |
91 | .name = (char *) "lttng-probe-ext4", | |
92 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
93 | }, | |
94 | { | |
95 | .name = (char *) "lttng-probe-gpio", | |
96 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
97 | }, | |
98 | { | |
99 | .name = (char *) "lttng-probe-i2c", | |
100 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
101 | }, | |
102 | { | |
103 | .name = (char *) "lttng-probe-irq", | |
104 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
105 | }, | |
106 | { | |
107 | .name = (char *) "lttng-probe-jbd", | |
108 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
109 | }, | |
110 | { | |
111 | .name = (char *) "lttng-probe-jbd2", | |
112 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
113 | }, | |
114 | { | |
115 | .name = (char *) "lttng-probe-kmem", | |
116 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
117 | }, | |
118 | { | |
119 | .name = (char *) "lttng-probe-kvm", | |
120 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
121 | }, | |
122 | { | |
123 | .name = (char *) "lttng-probe-kvm-x86", | |
124 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
125 | }, | |
126 | { | |
127 | .name = (char *) "lttng-probe-kvm-x86-mmu", | |
128 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
129 | }, | |
130 | { | |
131 | .name = (char *) "lttng-probe-lock", | |
132 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
133 | }, | |
134 | { | |
135 | .name = (char *) "lttng-probe-module", | |
136 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
137 | }, | |
138 | { | |
139 | .name = (char *) "lttng-probe-napi", | |
140 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
141 | }, | |
142 | { | |
143 | .name = (char *) "lttng-probe-net", | |
144 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
145 | }, | |
146 | { | |
147 | .name = (char *) "lttng-probe-power", | |
148 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
149 | }, | |
150 | { | |
151 | .name = (char *) "lttng-probe-preemptirq", | |
152 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
153 | }, | |
154 | { | |
155 | .name = (char *) "lttng-probe-printk", | |
156 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
157 | }, | |
158 | { | |
159 | .name = (char *) "lttng-probe-random", | |
160 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
161 | }, | |
162 | { | |
163 | .name = (char *) "lttng-probe-rcu", | |
164 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
165 | }, | |
166 | { | |
167 | .name = (char *) "lttng-probe-regmap", | |
168 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
169 | }, | |
170 | { | |
171 | .name = (char *) "lttng-probe-regulator", | |
172 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
173 | }, | |
174 | { | |
175 | .name = (char *) "lttng-probe-rpm", | |
176 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
177 | }, | |
178 | { | |
179 | .name = (char *) "lttng-probe-sched", | |
180 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
181 | }, | |
182 | { | |
183 | .name = (char *) "lttng-probe-scsi", | |
184 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
185 | }, | |
186 | { | |
187 | .name = (char *) "lttng-probe-signal", | |
188 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
189 | }, | |
190 | { | |
191 | .name = (char *) "lttng-probe-skb", | |
192 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
193 | }, | |
194 | { | |
195 | .name = (char *) "lttng-probe-sock", | |
196 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
197 | }, | |
198 | { | |
199 | .name = (char *) "lttng-probe-statedump", | |
200 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
201 | }, | |
202 | { | |
203 | .name = (char *) "lttng-probe-sunrpc", | |
204 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
205 | }, | |
206 | { | |
207 | .name = (char *) "lttng-probe-timer", | |
208 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
209 | }, | |
210 | { | |
211 | .name = (char *) "lttng-probe-udp", | |
212 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
213 | }, | |
214 | { | |
215 | .name = (char *) "lttng-probe-vmscan", | |
216 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
217 | }, | |
218 | { | |
219 | .name = (char *) "lttng-probe-v4l2", | |
220 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
221 | }, | |
222 | { | |
223 | .name = (char *) "lttng-probe-workqueue", | |
224 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
225 | }, | |
226 | { | |
227 | .name = (char *) "lttng-probe-writeback", | |
228 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
229 | }, | |
230 | { | |
231 | .name = (char *) "lttng-probe-x86-irq-vectors", | |
232 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
233 | }, | |
234 | { | |
235 | .name = (char *) "lttng-probe-x86-exceptions", | |
236 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
237 | }, | |
096102bd DG |
238 | }; |
239 | ||
fbb9748b JG |
240 | /* dynamic probe modules list */ |
241 | static struct kern_modules_param *probes; | |
242 | static int nr_probes; | |
c9d42407 | 243 | static int probes_capacity; |
fbb9748b | 244 | |
ce7fc42f | 245 | #ifdef HAVE_KMOD |
234170ac | 246 | #include <libkmod.h> |
866c17ce | 247 | |
d11b2027 MJ |
248 | /** |
249 | * @brief Logging function for libkmod integration. | |
250 | */ | |
d22ad5f8 | 251 | static ATTR_FORMAT_PRINTF(6, 0) |
f46376a1 MJ |
252 | void log_kmod(void *data __attribute__((unused)), |
253 | int priority __attribute__((unused)), | |
254 | const char *file __attribute__((unused)), | |
255 | int line __attribute__((unused)), | |
256 | const char *fn __attribute__((unused)), | |
257 | const char *format, va_list args) | |
234170ac UTL |
258 | { |
259 | char *str; | |
260 | ||
261 | if (vasprintf(&str, format, args) < 0) { | |
262 | return; | |
263 | } | |
264 | ||
265 | DBG("libkmod: %s", str); | |
266 | free(str); | |
267 | } | |
866c17ce | 268 | |
d11b2027 MJ |
269 | /** |
270 | * @brief Setup the libkmod context. | |
271 | * | |
272 | * Create the context, add a custom logging function and preload the | |
273 | * ressources for faster operation. | |
274 | * | |
275 | * @returns \c 0 on success | |
276 | * \c < 0 on error | |
277 | */ | |
866c17ce | 278 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 279 | { |
866c17ce | 280 | int ret = 0; |
234170ac | 281 | |
866c17ce | 282 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
283 | if (!ctx) { |
284 | PERROR("Unable to create kmod library context"); | |
285 | ret = -ENOMEM; | |
286 | goto error; | |
287 | } | |
288 | ||
d22ad5f8 SM |
289 | /* |
290 | * Parameter 2 of kmod_set_log_fn generates a | |
291 | * -Wsuggest-attribute=formatkmod_set_log_fn warning that we can't fix, | |
292 | * ignore it. | |
293 | */ | |
294 | DIAGNOSTIC_PUSH | |
295 | DIAGNOSTIC_IGNORE_SUGGEST_ATTRIBUTE_FORMAT | |
866c17ce | 296 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
d22ad5f8 | 297 | DIAGNOSTIC_POP |
866c17ce MJ |
298 | ret = kmod_load_resources(*ctx); |
299 | if (ret < 0) { | |
300 | ERR("Failed to load kmod library resources"); | |
301 | goto error; | |
302 | } | |
303 | ||
304 | error: | |
305 | return ret; | |
306 | } | |
307 | ||
d11b2027 MJ |
308 | /** |
309 | * @brief Loads the kernel modules in \p modules | |
310 | * | |
311 | * @param modules List of modules to load | |
312 | * @param entries Number of modules in the list | |
d11b2027 MJ |
313 | * |
314 | * If the modules are required, we will return with error after the | |
315 | * first failed module load, otherwise we continue loading. | |
316 | * | |
317 | * @returns \c 0 on success | |
318 | * \c < 0 on error | |
319 | */ | |
866c17ce | 320 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 321 | int entries) |
866c17ce MJ |
322 | { |
323 | int ret = 0, i; | |
324 | struct kmod_ctx *ctx; | |
325 | ||
326 | ret = setup_kmod_ctx(&ctx); | |
327 | if (ret < 0) { | |
328 | goto error; | |
329 | } | |
234170ac UTL |
330 | |
331 | for (i = 0; i < entries; i++) { | |
332 | struct kmod_module *mod = NULL; | |
333 | ||
334 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
335 | if (ret < 0) { | |
336 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
337 | goto error; | |
338 | } | |
339 | ||
0b1e16b8 | 340 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 341 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
342 | if (ret == -EEXIST) { |
343 | DBG("Module %s is already loaded", modules[i].name); | |
344 | ret = 0; | |
345 | } else if (ret < 0) { | |
adfe4f5e | 346 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
347 | ERR("Unable to load required module %s", |
348 | modules[i].name); | |
349 | goto error; | |
350 | } else { | |
351 | DBG("Unable to load optional module %s; continuing", | |
352 | modules[i].name); | |
353 | ret = 0; | |
354 | } | |
234170ac UTL |
355 | } else { |
356 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 357 | modules[i].loaded = true; |
234170ac UTL |
358 | } |
359 | ||
360 | kmod_module_unref(mod); | |
361 | } | |
362 | ||
363 | error: | |
364 | if (ctx) { | |
365 | kmod_unref(ctx); | |
366 | } | |
367 | return ret; | |
368 | } | |
369 | ||
d11b2027 MJ |
370 | /** |
371 | * @brief Recursively unload modules. | |
372 | * | |
373 | * This function implements the same modules unloading behavior as | |
374 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
375 | * dependencies and unload modules with a refcount of 0. | |
376 | * | |
377 | * @param mod The module to unload | |
378 | * | |
379 | * @returns \c 0 on success | |
380 | * \c < 0 on error | |
381 | */ | |
866c17ce MJ |
382 | static int rmmod_recurse(struct kmod_module *mod) { |
383 | int ret = 0; | |
384 | struct kmod_list *deps, *itr; | |
385 | ||
386 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
387 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | ret = kmod_module_remove_module(mod, 0); | |
392 | ||
393 | deps = kmod_module_get_dependencies(mod); | |
394 | if (deps != NULL) { | |
395 | kmod_list_foreach(itr, deps) { | |
396 | struct kmod_module *dep = kmod_module_get_module(itr); | |
397 | if (kmod_module_get_refcnt(dep) == 0) { | |
398 | DBG("Recursive remove module %s", | |
399 | kmod_module_get_name(dep)); | |
400 | rmmod_recurse(dep); | |
401 | } | |
402 | kmod_module_unref(dep); | |
403 | } | |
404 | kmod_module_unref_list(deps); | |
405 | } | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
d11b2027 MJ |
410 | /** |
411 | * @brief Unloads the kernel modules in \p modules | |
412 | * | |
413 | * @param modules List of modules to unload | |
414 | * @param entries Number of modules in the list | |
d11b2027 MJ |
415 | * |
416 | */ | |
866c17ce | 417 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 418 | int entries) |
866c17ce MJ |
419 | { |
420 | int ret = 0, i; | |
421 | struct kmod_ctx *ctx; | |
422 | ||
423 | ret = setup_kmod_ctx(&ctx); | |
424 | if (ret < 0) { | |
425 | goto error; | |
426 | } | |
427 | ||
428 | for (i = entries - 1; i >= 0; i--) { | |
429 | struct kmod_module *mod = NULL; | |
430 | ||
4ad664a0 JG |
431 | if (!modules[i].loaded) { |
432 | continue; | |
433 | } | |
434 | ||
866c17ce MJ |
435 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
436 | if (ret < 0) { | |
437 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
438 | goto error; | |
439 | } | |
440 | ||
441 | ret = rmmod_recurse(mod); | |
442 | if (ret == -EEXIST) { | |
443 | DBG("Module %s is not in kernel.", modules[i].name); | |
adfe4f5e | 444 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && ret < 0) { |
866c17ce MJ |
445 | ERR("Unable to remove module %s", modules[i].name); |
446 | } else { | |
447 | DBG("Modprobe removal successful %s", | |
448 | modules[i].name); | |
449 | } | |
450 | ||
451 | kmod_module_unref(mod); | |
452 | } | |
453 | ||
454 | error: | |
455 | if (ctx) { | |
456 | kmod_unref(ctx); | |
457 | } | |
458 | } | |
459 | ||
234170ac UTL |
460 | #else /* HAVE_KMOD */ |
461 | ||
fbb9748b | 462 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 463 | int entries) |
096102bd DG |
464 | { |
465 | int ret = 0, i; | |
466 | char modprobe[256]; | |
467 | ||
e23b81ed | 468 | for (i = 0; i < entries; i++) { |
096102bd DG |
469 | ret = snprintf(modprobe, sizeof(modprobe), |
470 | "/sbin/modprobe %s%s", | |
adfe4f5e | 471 | modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED ? "" : "-q ", |
e23b81ed | 472 | modules[i].name); |
096102bd DG |
473 | if (ret < 0) { |
474 | PERROR("snprintf modprobe"); | |
475 | goto error; | |
476 | } | |
477 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
478 | ret = system(modprobe); | |
479 | if (ret == -1) { | |
adfe4f5e | 480 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
481 | ERR("Unable to launch modprobe for required module %s", |
482 | modules[i].name); | |
483 | goto error; | |
484 | } else { | |
485 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
486 | modules[i].name); | |
487 | ret = 0; | |
488 | } | |
489 | } else if (WEXITSTATUS(ret) != 0) { | |
adfe4f5e | 490 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
491 | ERR("Unable to load required module %s", |
492 | modules[i].name); | |
493 | goto error; | |
494 | } else { | |
495 | DBG("Unable to load optional module %s; continuing", | |
496 | modules[i].name); | |
497 | ret = 0; | |
498 | } | |
096102bd | 499 | } else { |
ab57d7d3 | 500 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 501 | modules[i].loaded = true; |
096102bd DG |
502 | } |
503 | } | |
504 | ||
505 | error: | |
506 | return ret; | |
507 | } | |
508 | ||
35e090b7 | 509 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 510 | int entries) |
35e090b7 MJ |
511 | { |
512 | int ret = 0, i; | |
513 | char modprobe[256]; | |
514 | ||
515 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
516 | if (!modules[i].loaded) { |
517 | continue; | |
518 | } | |
35e090b7 MJ |
519 | ret = snprintf(modprobe, sizeof(modprobe), |
520 | "/sbin/modprobe -r -q %s", | |
521 | modules[i].name); | |
522 | if (ret < 0) { | |
523 | PERROR("snprintf modprobe -r"); | |
524 | return; | |
525 | } | |
526 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
527 | ret = system(modprobe); | |
528 | if (ret == -1) { | |
1d25334c FD |
529 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
530 | ERR("Unable to launch modprobe -r for required module %s", | |
531 | modules[i].name); | |
532 | } else { | |
533 | DBG("Unable to launch modprobe -r for optional module %s", | |
534 | modules[i].name); | |
535 | } | |
536 | } else if (WEXITSTATUS(ret) != 0) { | |
537 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { | |
538 | ERR("Unable to remove required module %s", | |
539 | modules[i].name); | |
540 | } else { | |
541 | DBG("Unable to remove optional module %s", | |
542 | modules[i].name); | |
543 | } | |
35e090b7 | 544 | } else { |
1d25334c | 545 | DBG("Modprobe removal successful %s", modules[i].name); |
35e090b7 MJ |
546 | } |
547 | } | |
548 | } | |
549 | ||
866c17ce MJ |
550 | #endif /* HAVE_KMOD */ |
551 | ||
35e090b7 MJ |
552 | /* |
553 | * Remove control kernel module(s) in reverse load order. | |
554 | */ | |
555 | void modprobe_remove_lttng_control(void) | |
556 | { | |
557 | modprobe_remove_lttng(kern_modules_control_core, | |
adfe4f5e | 558 | ARRAY_SIZE(kern_modules_control_core)); |
35e090b7 MJ |
559 | } |
560 | ||
561 | static void free_probes(void) | |
562 | { | |
563 | int i; | |
564 | ||
565 | if (!probes) { | |
566 | return; | |
567 | } | |
568 | for (i = 0; i < nr_probes; ++i) { | |
569 | free(probes[i].name); | |
570 | } | |
571 | free(probes); | |
572 | probes = NULL; | |
573 | nr_probes = 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Remove data kernel modules in reverse load order. | |
578 | */ | |
579 | void modprobe_remove_lttng_data(void) | |
580 | { | |
581 | if (!probes) { | |
582 | return; | |
583 | } | |
adfe4f5e JG |
584 | |
585 | modprobe_remove_lttng(probes, nr_probes); | |
35e090b7 MJ |
586 | free_probes(); |
587 | } | |
588 | ||
589 | /* | |
590 | * Remove all kernel modules in reverse order. | |
591 | */ | |
592 | void modprobe_remove_lttng_all(void) | |
593 | { | |
594 | modprobe_remove_lttng_data(); | |
595 | modprobe_remove_lttng_control(); | |
596 | } | |
597 | ||
e23b81ed JG |
598 | /* |
599 | * Load control kernel module(s). | |
600 | */ | |
601 | int modprobe_lttng_control(void) | |
602 | { | |
adfe4f5e JG |
603 | return modprobe_lttng(kern_modules_control_core, |
604 | ARRAY_SIZE(kern_modules_control_core)); | |
e23b81ed | 605 | } |
ab57d7d3 | 606 | |
c9d42407 PP |
607 | /** |
608 | * Grow global list of probes (double capacity or set it to 1 if | |
609 | * currently 0 and copy existing data). | |
096102bd | 610 | */ |
c9d42407 | 611 | static int grow_probes(void) |
096102bd | 612 | { |
c9d42407 PP |
613 | int i; |
614 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 615 | |
c9d42407 PP |
616 | /* Initialize capacity to 1 if 0. */ |
617 | if (probes_capacity == 0) { | |
7966af57 | 618 | probes = (kern_modules_param *) zmalloc(sizeof(*probes)); |
c9d42407 PP |
619 | if (!probes) { |
620 | PERROR("malloc probe list"); | |
621 | return -ENOMEM; | |
622 | } | |
623 | ||
624 | probes_capacity = 1; | |
625 | return 0; | |
fbb9748b JG |
626 | } |
627 | ||
c9d42407 PP |
628 | /* Double size. */ |
629 | probes_capacity *= 2; | |
630 | ||
7966af57 | 631 | tmp_probes = (kern_modules_param *) zmalloc(sizeof(*tmp_probes) * probes_capacity); |
c9d42407 | 632 | if (!tmp_probes) { |
fbb9748b JG |
633 | PERROR("malloc probe list"); |
634 | return -ENOMEM; | |
635 | } | |
636 | ||
c9d42407 | 637 | for (i = 0; i < nr_probes; ++i) { |
adfe4f5e JG |
638 | /* Ownership of 'name' field is transferred. */ |
639 | tmp_probes[i] = probes[i]; | |
c9d42407 PP |
640 | } |
641 | ||
642 | /* Replace probes with larger copy. */ | |
643 | free(probes); | |
644 | probes = tmp_probes; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Appends a comma-separated list of probes to the global list | |
651 | * of probes. | |
652 | */ | |
653 | static int append_list_to_probes(const char *list) | |
654 | { | |
655 | char *next; | |
d3c04b7c | 656 | int ret; |
50e0fa5f | 657 | char *tmp_list, *cur_list, *saveptr; |
c9d42407 | 658 | |
a0377dfe | 659 | LTTNG_ASSERT(list); |
c9d42407 | 660 | |
44603c80 | 661 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
662 | if (!tmp_list) { |
663 | PERROR("strdup temp list"); | |
664 | return -ENOMEM; | |
665 | } | |
666 | ||
667 | for (;;) { | |
fbb9748b | 668 | size_t name_len; |
c9d42407 | 669 | struct kern_modules_param *cur_mod; |
fbb9748b | 670 | |
50e0fa5f | 671 | next = strtok_r(cur_list, ",", &saveptr); |
fbb9748b | 672 | if (!next) { |
c9d42407 | 673 | break; |
fbb9748b | 674 | } |
44603c80 | 675 | cur_list = NULL; |
fbb9748b JG |
676 | |
677 | /* filter leading spaces */ | |
678 | while (*next == ' ') { | |
679 | next++; | |
680 | } | |
681 | ||
c9d42407 PP |
682 | if (probes_capacity <= nr_probes) { |
683 | ret = grow_probes(); | |
684 | if (ret) { | |
398d5459 | 685 | goto error; |
c9d42407 PP |
686 | } |
687 | } | |
688 | ||
fbb9748b JG |
689 | /* Length 13 is "lttng-probe-" + \0 */ |
690 | name_len = strlen(next) + 13; | |
691 | ||
d3c04b7c | 692 | cur_mod = &probes[nr_probes]; |
7966af57 | 693 | cur_mod->name = (char *) zmalloc(name_len); |
c9d42407 | 694 | if (!cur_mod->name) { |
fbb9748b | 695 | PERROR("malloc probe list"); |
398d5459 MD |
696 | ret = -ENOMEM; |
697 | goto error; | |
fbb9748b JG |
698 | } |
699 | ||
c9d42407 | 700 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
701 | if (ret < 0) { |
702 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
703 | ret = -ENOMEM; |
704 | goto error; | |
fbb9748b | 705 | } |
c9d42407 | 706 | |
adfe4f5e JG |
707 | cur_mod->load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL; |
708 | ||
c9d42407 | 709 | nr_probes++; |
fbb9748b JG |
710 | } |
711 | ||
c9d42407 | 712 | free(tmp_list); |
c9d42407 | 713 | return 0; |
398d5459 MD |
714 | |
715 | error: | |
716 | free(tmp_list); | |
717 | free_probes(); | |
718 | return ret; | |
c9d42407 PP |
719 | } |
720 | ||
721 | /* | |
722 | * Load data kernel module(s). | |
723 | */ | |
724 | int modprobe_lttng_data(void) | |
725 | { | |
726 | int ret, i; | |
727 | char *list; | |
728 | ||
729 | /* | |
730 | * Base probes: either from command line option, environment | |
731 | * variable or default list. | |
732 | */ | |
412d7227 | 733 | list = the_config.kmod_probes_list.value; |
c9d42407 PP |
734 | if (list) { |
735 | /* User-specified probes. */ | |
736 | ret = append_list_to_probes(list); | |
c9d42407 PP |
737 | if (ret) { |
738 | return ret; | |
739 | } | |
740 | } else { | |
741 | /* Default probes. */ | |
742 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 743 | |
7966af57 | 744 | probes = (kern_modules_param *) zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
745 | if (!probes) { |
746 | PERROR("malloc probe list"); | |
747 | return -ENOMEM; | |
748 | } | |
749 | ||
750 | nr_probes = probes_capacity = def_len; | |
751 | ||
752 | for (i = 0; i < def_len; ++i) { | |
753 | char* name = strdup(kern_modules_probes_default[i].name); | |
754 | ||
755 | if (!name) { | |
756 | PERROR("strdup probe item"); | |
398d5459 MD |
757 | ret = -ENOMEM; |
758 | goto error; | |
c9d42407 PP |
759 | } |
760 | ||
761 | probes[i].name = name; | |
adfe4f5e | 762 | probes[i].load_policy = kern_modules_probes_default[i].load_policy; |
c9d42407 PP |
763 | } |
764 | } | |
765 | ||
766 | /* | |
767 | * Extra modules? Append them to current probes list. | |
768 | */ | |
412d7227 | 769 | list = the_config.kmod_extra_probes_list.value; |
c9d42407 PP |
770 | if (list) { |
771 | ret = append_list_to_probes(list); | |
772 | if (ret) { | |
398d5459 | 773 | goto error; |
c9d42407 PP |
774 | } |
775 | } | |
776 | ||
777 | /* | |
778 | * Load probes modules now. | |
779 | */ | |
adfe4f5e | 780 | ret = modprobe_lttng(probes, nr_probes); |
398d5459 MD |
781 | if (ret) { |
782 | goto error; | |
783 | } | |
784 | return ret; | |
785 | ||
786 | error: | |
787 | free_probes(); | |
788 | return ret; | |
096102bd | 789 | } |