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 |
c9d42407 | 17 | #include <assert.h> |
096102bd DG |
18 | #include <stdio.h> |
19 | #include <stdlib.h> | |
20 | #include <sys/wait.h> | |
21 | ||
22 | #include <common/common.h> | |
fbb9748b | 23 | #include <common/utils.h> |
096102bd DG |
24 | |
25 | #include "modprobe.h" | |
26 | #include "kern-modules.h" | |
e6142f2e | 27 | #include "lttng-sessiond.h" |
096102bd | 28 | |
ab57d7d3 JG |
29 | /* LTTng kernel tracer mandatory core modules list */ |
30 | struct kern_modules_param kern_modules_control_core[] = { | |
adfe4f5e JG |
31 | { |
32 | .name = (char *) "lttng-ring-buffer-client-discard", | |
33 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
34 | }, | |
35 | { | |
36 | .name = (char *) "lttng-ring-buffer-client-overwrite", | |
37 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
38 | }, | |
39 | { | |
40 | .name = (char *) "lttng-ring-buffer-metadata-client", | |
41 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
42 | }, | |
43 | { | |
44 | .name = (char *) "lttng-ring-buffer-client-mmap-discard", | |
45 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
46 | }, | |
47 | { | |
48 | .name = (char *) "lttng-ring-buffer-client-mmap-overwrite", | |
49 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
50 | }, | |
51 | { | |
52 | .name = (char *) "lttng-ring-buffer-metadata-mmap-client", | |
53 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
54 | }, | |
ab57d7d3 JG |
55 | }; |
56 | ||
adfe4f5e | 57 | /* LTTng kerneltracer probe modules list */ |
fbb9748b | 58 | struct kern_modules_param kern_modules_probes_default[] = { |
adfe4f5e JG |
59 | { |
60 | .name = (char *) "lttng-probe-asoc", | |
61 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
62 | }, | |
63 | { | |
64 | .name = (char *) "lttng-probe-block", | |
65 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
66 | }, | |
67 | { | |
68 | .name = (char *) "lttng-probe-btrfs", | |
69 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
70 | }, | |
71 | { | |
72 | .name = (char *) "lttng-probe-compaction", | |
73 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
74 | }, | |
75 | { | |
76 | .name = (char *) "lttng-probe-ext3", | |
77 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
78 | }, | |
79 | { | |
80 | .name = (char *) "lttng-probe-ext4", | |
81 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
82 | }, | |
83 | { | |
84 | .name = (char *) "lttng-probe-gpio", | |
85 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
86 | }, | |
87 | { | |
88 | .name = (char *) "lttng-probe-i2c", | |
89 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
90 | }, | |
91 | { | |
92 | .name = (char *) "lttng-probe-irq", | |
93 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
94 | }, | |
95 | { | |
96 | .name = (char *) "lttng-probe-jbd", | |
97 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
98 | }, | |
99 | { | |
100 | .name = (char *) "lttng-probe-jbd2", | |
101 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
102 | }, | |
103 | { | |
104 | .name = (char *) "lttng-probe-kmem", | |
105 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
106 | }, | |
107 | { | |
108 | .name = (char *) "lttng-probe-kvm", | |
109 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
110 | }, | |
111 | { | |
112 | .name = (char *) "lttng-probe-kvm-x86", | |
113 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
114 | }, | |
115 | { | |
116 | .name = (char *) "lttng-probe-kvm-x86-mmu", | |
117 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
118 | }, | |
119 | { | |
120 | .name = (char *) "lttng-probe-lock", | |
121 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
122 | }, | |
123 | { | |
124 | .name = (char *) "lttng-probe-module", | |
125 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
126 | }, | |
127 | { | |
128 | .name = (char *) "lttng-probe-napi", | |
129 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
130 | }, | |
131 | { | |
132 | .name = (char *) "lttng-probe-net", | |
133 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
134 | }, | |
135 | { | |
136 | .name = (char *) "lttng-probe-power", | |
137 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
138 | }, | |
139 | { | |
140 | .name = (char *) "lttng-probe-preemptirq", | |
141 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
142 | }, | |
143 | { | |
144 | .name = (char *) "lttng-probe-printk", | |
145 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
146 | }, | |
147 | { | |
148 | .name = (char *) "lttng-probe-random", | |
149 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
150 | }, | |
151 | { | |
152 | .name = (char *) "lttng-probe-rcu", | |
153 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
154 | }, | |
155 | { | |
156 | .name = (char *) "lttng-probe-regmap", | |
157 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
158 | }, | |
159 | { | |
160 | .name = (char *) "lttng-probe-regulator", | |
161 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
162 | }, | |
163 | { | |
164 | .name = (char *) "lttng-probe-rpm", | |
165 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
166 | }, | |
167 | { | |
168 | .name = (char *) "lttng-probe-sched", | |
169 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
170 | }, | |
171 | { | |
172 | .name = (char *) "lttng-probe-scsi", | |
173 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
174 | }, | |
175 | { | |
176 | .name = (char *) "lttng-probe-signal", | |
177 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
178 | }, | |
179 | { | |
180 | .name = (char *) "lttng-probe-skb", | |
181 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
182 | }, | |
183 | { | |
184 | .name = (char *) "lttng-probe-sock", | |
185 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
186 | }, | |
187 | { | |
188 | .name = (char *) "lttng-probe-statedump", | |
189 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
190 | }, | |
191 | { | |
192 | .name = (char *) "lttng-probe-sunrpc", | |
193 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
194 | }, | |
195 | { | |
196 | .name = (char *) "lttng-probe-timer", | |
197 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
198 | }, | |
199 | { | |
200 | .name = (char *) "lttng-probe-udp", | |
201 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
202 | }, | |
203 | { | |
204 | .name = (char *) "lttng-probe-vmscan", | |
205 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
206 | }, | |
207 | { | |
208 | .name = (char *) "lttng-probe-v4l2", | |
209 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
210 | }, | |
211 | { | |
212 | .name = (char *) "lttng-probe-workqueue", | |
213 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
214 | }, | |
215 | { | |
216 | .name = (char *) "lttng-probe-writeback", | |
217 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
218 | }, | |
219 | { | |
220 | .name = (char *) "lttng-probe-x86-irq-vectors", | |
221 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
222 | }, | |
223 | { | |
224 | .name = (char *) "lttng-probe-x86-exceptions", | |
225 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
226 | }, | |
096102bd DG |
227 | }; |
228 | ||
fbb9748b JG |
229 | /* dynamic probe modules list */ |
230 | static struct kern_modules_param *probes; | |
231 | static int nr_probes; | |
c9d42407 | 232 | static int probes_capacity; |
fbb9748b | 233 | |
234170ac UTL |
234 | #if HAVE_KMOD |
235 | #include <libkmod.h> | |
866c17ce | 236 | |
d11b2027 MJ |
237 | /** |
238 | * @brief Logging function for libkmod integration. | |
239 | */ | |
234170ac UTL |
240 | static void log_kmod(void *data, int priority, const char *file, int line, |
241 | const char *fn, const char *format, va_list args) | |
242 | { | |
243 | char *str; | |
244 | ||
245 | if (vasprintf(&str, format, args) < 0) { | |
246 | return; | |
247 | } | |
248 | ||
249 | DBG("libkmod: %s", str); | |
250 | free(str); | |
251 | } | |
866c17ce | 252 | |
d11b2027 MJ |
253 | /** |
254 | * @brief Setup the libkmod context. | |
255 | * | |
256 | * Create the context, add a custom logging function and preload the | |
257 | * ressources for faster operation. | |
258 | * | |
259 | * @returns \c 0 on success | |
260 | * \c < 0 on error | |
261 | */ | |
866c17ce | 262 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 263 | { |
866c17ce | 264 | int ret = 0; |
234170ac | 265 | |
866c17ce | 266 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
267 | if (!ctx) { |
268 | PERROR("Unable to create kmod library context"); | |
269 | ret = -ENOMEM; | |
270 | goto error; | |
271 | } | |
272 | ||
866c17ce MJ |
273 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
274 | ret = kmod_load_resources(*ctx); | |
275 | if (ret < 0) { | |
276 | ERR("Failed to load kmod library resources"); | |
277 | goto error; | |
278 | } | |
279 | ||
280 | error: | |
281 | return ret; | |
282 | } | |
283 | ||
d11b2027 MJ |
284 | /** |
285 | * @brief Loads the kernel modules in \p modules | |
286 | * | |
287 | * @param modules List of modules to load | |
288 | * @param entries Number of modules in the list | |
d11b2027 MJ |
289 | * |
290 | * If the modules are required, we will return with error after the | |
291 | * first failed module load, otherwise we continue loading. | |
292 | * | |
293 | * @returns \c 0 on success | |
294 | * \c < 0 on error | |
295 | */ | |
866c17ce | 296 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 297 | int entries) |
866c17ce MJ |
298 | { |
299 | int ret = 0, i; | |
300 | struct kmod_ctx *ctx; | |
301 | ||
302 | ret = setup_kmod_ctx(&ctx); | |
303 | if (ret < 0) { | |
304 | goto error; | |
305 | } | |
234170ac UTL |
306 | |
307 | for (i = 0; i < entries; i++) { | |
308 | struct kmod_module *mod = NULL; | |
309 | ||
310 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
311 | if (ret < 0) { | |
312 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
313 | goto error; | |
314 | } | |
315 | ||
0b1e16b8 | 316 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 317 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
318 | if (ret == -EEXIST) { |
319 | DBG("Module %s is already loaded", modules[i].name); | |
320 | ret = 0; | |
321 | } else if (ret < 0) { | |
adfe4f5e | 322 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
323 | ERR("Unable to load required module %s", |
324 | modules[i].name); | |
325 | goto error; | |
326 | } else { | |
327 | DBG("Unable to load optional module %s; continuing", | |
328 | modules[i].name); | |
329 | ret = 0; | |
330 | } | |
234170ac UTL |
331 | } else { |
332 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 333 | modules[i].loaded = true; |
234170ac UTL |
334 | } |
335 | ||
336 | kmod_module_unref(mod); | |
337 | } | |
338 | ||
339 | error: | |
340 | if (ctx) { | |
341 | kmod_unref(ctx); | |
342 | } | |
343 | return ret; | |
344 | } | |
345 | ||
d11b2027 MJ |
346 | /** |
347 | * @brief Recursively unload modules. | |
348 | * | |
349 | * This function implements the same modules unloading behavior as | |
350 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
351 | * dependencies and unload modules with a refcount of 0. | |
352 | * | |
353 | * @param mod The module to unload | |
354 | * | |
355 | * @returns \c 0 on success | |
356 | * \c < 0 on error | |
357 | */ | |
866c17ce MJ |
358 | static int rmmod_recurse(struct kmod_module *mod) { |
359 | int ret = 0; | |
360 | struct kmod_list *deps, *itr; | |
361 | ||
362 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
363 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
364 | return ret; | |
365 | } | |
366 | ||
367 | ret = kmod_module_remove_module(mod, 0); | |
368 | ||
369 | deps = kmod_module_get_dependencies(mod); | |
370 | if (deps != NULL) { | |
371 | kmod_list_foreach(itr, deps) { | |
372 | struct kmod_module *dep = kmod_module_get_module(itr); | |
373 | if (kmod_module_get_refcnt(dep) == 0) { | |
374 | DBG("Recursive remove module %s", | |
375 | kmod_module_get_name(dep)); | |
376 | rmmod_recurse(dep); | |
377 | } | |
378 | kmod_module_unref(dep); | |
379 | } | |
380 | kmod_module_unref_list(deps); | |
381 | } | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
d11b2027 MJ |
386 | /** |
387 | * @brief Unloads the kernel modules in \p modules | |
388 | * | |
389 | * @param modules List of modules to unload | |
390 | * @param entries Number of modules in the list | |
d11b2027 MJ |
391 | * |
392 | */ | |
866c17ce | 393 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 394 | int entries) |
866c17ce MJ |
395 | { |
396 | int ret = 0, i; | |
397 | struct kmod_ctx *ctx; | |
398 | ||
399 | ret = setup_kmod_ctx(&ctx); | |
400 | if (ret < 0) { | |
401 | goto error; | |
402 | } | |
403 | ||
404 | for (i = entries - 1; i >= 0; i--) { | |
405 | struct kmod_module *mod = NULL; | |
406 | ||
4ad664a0 JG |
407 | if (!modules[i].loaded) { |
408 | continue; | |
409 | } | |
410 | ||
866c17ce MJ |
411 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
412 | if (ret < 0) { | |
413 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
414 | goto error; | |
415 | } | |
416 | ||
417 | ret = rmmod_recurse(mod); | |
418 | if (ret == -EEXIST) { | |
419 | DBG("Module %s is not in kernel.", modules[i].name); | |
adfe4f5e | 420 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && ret < 0) { |
866c17ce MJ |
421 | ERR("Unable to remove module %s", modules[i].name); |
422 | } else { | |
423 | DBG("Modprobe removal successful %s", | |
424 | modules[i].name); | |
425 | } | |
426 | ||
427 | kmod_module_unref(mod); | |
428 | } | |
429 | ||
430 | error: | |
431 | if (ctx) { | |
432 | kmod_unref(ctx); | |
433 | } | |
434 | } | |
435 | ||
234170ac UTL |
436 | #else /* HAVE_KMOD */ |
437 | ||
fbb9748b | 438 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 439 | int entries) |
096102bd DG |
440 | { |
441 | int ret = 0, i; | |
442 | char modprobe[256]; | |
443 | ||
e23b81ed | 444 | for (i = 0; i < entries; i++) { |
096102bd DG |
445 | ret = snprintf(modprobe, sizeof(modprobe), |
446 | "/sbin/modprobe %s%s", | |
adfe4f5e | 447 | modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED ? "" : "-q ", |
e23b81ed | 448 | modules[i].name); |
096102bd DG |
449 | if (ret < 0) { |
450 | PERROR("snprintf modprobe"); | |
451 | goto error; | |
452 | } | |
453 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
454 | ret = system(modprobe); | |
455 | if (ret == -1) { | |
adfe4f5e | 456 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
457 | ERR("Unable to launch modprobe for required module %s", |
458 | modules[i].name); | |
459 | goto error; | |
460 | } else { | |
461 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
462 | modules[i].name); | |
463 | ret = 0; | |
464 | } | |
465 | } else if (WEXITSTATUS(ret) != 0) { | |
adfe4f5e | 466 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
467 | ERR("Unable to load required module %s", |
468 | modules[i].name); | |
469 | goto error; | |
470 | } else { | |
471 | DBG("Unable to load optional module %s; continuing", | |
472 | modules[i].name); | |
473 | ret = 0; | |
474 | } | |
096102bd | 475 | } else { |
ab57d7d3 | 476 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 477 | modules[i].loaded = true; |
096102bd DG |
478 | } |
479 | } | |
480 | ||
481 | error: | |
482 | return ret; | |
483 | } | |
484 | ||
35e090b7 | 485 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 486 | int entries) |
35e090b7 MJ |
487 | { |
488 | int ret = 0, i; | |
489 | char modprobe[256]; | |
490 | ||
491 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
492 | if (!modules[i].loaded) { |
493 | continue; | |
494 | } | |
35e090b7 MJ |
495 | ret = snprintf(modprobe, sizeof(modprobe), |
496 | "/sbin/modprobe -r -q %s", | |
497 | modules[i].name); | |
498 | if (ret < 0) { | |
499 | PERROR("snprintf modprobe -r"); | |
500 | return; | |
501 | } | |
502 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
503 | ret = system(modprobe); | |
504 | if (ret == -1) { | |
505 | ERR("Unable to launch modprobe -r for module %s", | |
506 | modules[i].name); | |
adfe4f5e | 507 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && WEXITSTATUS(ret) != 0) { |
35e090b7 MJ |
508 | ERR("Unable to remove module %s", |
509 | modules[i].name); | |
510 | } else { | |
511 | DBG("Modprobe removal successful %s", | |
512 | modules[i].name); | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
866c17ce MJ |
517 | #endif /* HAVE_KMOD */ |
518 | ||
35e090b7 MJ |
519 | /* |
520 | * Remove control kernel module(s) in reverse load order. | |
521 | */ | |
522 | void modprobe_remove_lttng_control(void) | |
523 | { | |
524 | modprobe_remove_lttng(kern_modules_control_core, | |
adfe4f5e | 525 | ARRAY_SIZE(kern_modules_control_core)); |
35e090b7 MJ |
526 | } |
527 | ||
528 | static void free_probes(void) | |
529 | { | |
530 | int i; | |
531 | ||
532 | if (!probes) { | |
533 | return; | |
534 | } | |
535 | for (i = 0; i < nr_probes; ++i) { | |
536 | free(probes[i].name); | |
537 | } | |
538 | free(probes); | |
539 | probes = NULL; | |
540 | nr_probes = 0; | |
541 | } | |
542 | ||
543 | /* | |
544 | * Remove data kernel modules in reverse load order. | |
545 | */ | |
546 | void modprobe_remove_lttng_data(void) | |
547 | { | |
548 | if (!probes) { | |
549 | return; | |
550 | } | |
adfe4f5e JG |
551 | |
552 | modprobe_remove_lttng(probes, nr_probes); | |
35e090b7 MJ |
553 | free_probes(); |
554 | } | |
555 | ||
556 | /* | |
557 | * Remove all kernel modules in reverse order. | |
558 | */ | |
559 | void modprobe_remove_lttng_all(void) | |
560 | { | |
561 | modprobe_remove_lttng_data(); | |
562 | modprobe_remove_lttng_control(); | |
563 | } | |
564 | ||
e23b81ed JG |
565 | /* |
566 | * Load control kernel module(s). | |
567 | */ | |
568 | int modprobe_lttng_control(void) | |
569 | { | |
adfe4f5e JG |
570 | return modprobe_lttng(kern_modules_control_core, |
571 | ARRAY_SIZE(kern_modules_control_core)); | |
e23b81ed | 572 | } |
ab57d7d3 | 573 | |
c9d42407 PP |
574 | /** |
575 | * Grow global list of probes (double capacity or set it to 1 if | |
576 | * currently 0 and copy existing data). | |
096102bd | 577 | */ |
c9d42407 | 578 | static int grow_probes(void) |
096102bd | 579 | { |
c9d42407 PP |
580 | int i; |
581 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 582 | |
c9d42407 PP |
583 | /* Initialize capacity to 1 if 0. */ |
584 | if (probes_capacity == 0) { | |
585 | probes = zmalloc(sizeof(*probes)); | |
586 | if (!probes) { | |
587 | PERROR("malloc probe list"); | |
588 | return -ENOMEM; | |
589 | } | |
590 | ||
591 | probes_capacity = 1; | |
592 | return 0; | |
fbb9748b JG |
593 | } |
594 | ||
c9d42407 PP |
595 | /* Double size. */ |
596 | probes_capacity *= 2; | |
597 | ||
598 | tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity); | |
599 | if (!tmp_probes) { | |
fbb9748b JG |
600 | PERROR("malloc probe list"); |
601 | return -ENOMEM; | |
602 | } | |
603 | ||
c9d42407 | 604 | for (i = 0; i < nr_probes; ++i) { |
adfe4f5e JG |
605 | /* Ownership of 'name' field is transferred. */ |
606 | tmp_probes[i] = probes[i]; | |
c9d42407 PP |
607 | } |
608 | ||
609 | /* Replace probes with larger copy. */ | |
610 | free(probes); | |
611 | probes = tmp_probes; | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Appends a comma-separated list of probes to the global list | |
618 | * of probes. | |
619 | */ | |
620 | static int append_list_to_probes(const char *list) | |
621 | { | |
622 | char *next; | |
d3c04b7c | 623 | int ret; |
44603c80 | 624 | char *tmp_list, *cur_list; |
c9d42407 PP |
625 | |
626 | assert(list); | |
627 | ||
44603c80 | 628 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
629 | if (!tmp_list) { |
630 | PERROR("strdup temp list"); | |
631 | return -ENOMEM; | |
632 | } | |
633 | ||
634 | for (;;) { | |
fbb9748b | 635 | size_t name_len; |
c9d42407 | 636 | struct kern_modules_param *cur_mod; |
fbb9748b | 637 | |
44603c80 | 638 | next = strtok(cur_list, ","); |
fbb9748b | 639 | if (!next) { |
c9d42407 | 640 | break; |
fbb9748b | 641 | } |
44603c80 | 642 | cur_list = NULL; |
fbb9748b JG |
643 | |
644 | /* filter leading spaces */ | |
645 | while (*next == ' ') { | |
646 | next++; | |
647 | } | |
648 | ||
c9d42407 PP |
649 | if (probes_capacity <= nr_probes) { |
650 | ret = grow_probes(); | |
651 | if (ret) { | |
398d5459 | 652 | goto error; |
c9d42407 PP |
653 | } |
654 | } | |
655 | ||
fbb9748b JG |
656 | /* Length 13 is "lttng-probe-" + \0 */ |
657 | name_len = strlen(next) + 13; | |
658 | ||
d3c04b7c | 659 | cur_mod = &probes[nr_probes]; |
c9d42407 PP |
660 | cur_mod->name = zmalloc(name_len); |
661 | if (!cur_mod->name) { | |
fbb9748b | 662 | PERROR("malloc probe list"); |
398d5459 MD |
663 | ret = -ENOMEM; |
664 | goto error; | |
fbb9748b JG |
665 | } |
666 | ||
c9d42407 | 667 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
668 | if (ret < 0) { |
669 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
670 | ret = -ENOMEM; |
671 | goto error; | |
fbb9748b | 672 | } |
c9d42407 | 673 | |
adfe4f5e JG |
674 | cur_mod->load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL; |
675 | ||
c9d42407 | 676 | nr_probes++; |
fbb9748b JG |
677 | } |
678 | ||
c9d42407 | 679 | free(tmp_list); |
c9d42407 | 680 | return 0; |
398d5459 MD |
681 | |
682 | error: | |
683 | free(tmp_list); | |
684 | free_probes(); | |
685 | return ret; | |
c9d42407 PP |
686 | } |
687 | ||
688 | /* | |
689 | * Load data kernel module(s). | |
690 | */ | |
691 | int modprobe_lttng_data(void) | |
692 | { | |
693 | int ret, i; | |
694 | char *list; | |
695 | ||
696 | /* | |
697 | * Base probes: either from command line option, environment | |
698 | * variable or default list. | |
699 | */ | |
e6142f2e | 700 | list = config.kmod_probes_list.value; |
c9d42407 PP |
701 | if (list) { |
702 | /* User-specified probes. */ | |
703 | ret = append_list_to_probes(list); | |
c9d42407 PP |
704 | if (ret) { |
705 | return ret; | |
706 | } | |
707 | } else { | |
708 | /* Default probes. */ | |
709 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 710 | |
62e0422e | 711 | probes = zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
712 | if (!probes) { |
713 | PERROR("malloc probe list"); | |
714 | return -ENOMEM; | |
715 | } | |
716 | ||
717 | nr_probes = probes_capacity = def_len; | |
718 | ||
719 | for (i = 0; i < def_len; ++i) { | |
720 | char* name = strdup(kern_modules_probes_default[i].name); | |
721 | ||
722 | if (!name) { | |
723 | PERROR("strdup probe item"); | |
398d5459 MD |
724 | ret = -ENOMEM; |
725 | goto error; | |
c9d42407 PP |
726 | } |
727 | ||
728 | probes[i].name = name; | |
adfe4f5e | 729 | probes[i].load_policy = kern_modules_probes_default[i].load_policy; |
c9d42407 PP |
730 | } |
731 | } | |
732 | ||
733 | /* | |
734 | * Extra modules? Append them to current probes list. | |
735 | */ | |
e6142f2e | 736 | list = config.kmod_extra_probes_list.value; |
c9d42407 PP |
737 | if (list) { |
738 | ret = append_list_to_probes(list); | |
739 | if (ret) { | |
398d5459 | 740 | goto error; |
c9d42407 PP |
741 | } |
742 | } | |
743 | ||
744 | /* | |
745 | * Load probes modules now. | |
746 | */ | |
adfe4f5e | 747 | ret = modprobe_lttng(probes, nr_probes); |
398d5459 MD |
748 | if (ret) { |
749 | goto error; | |
750 | } | |
751 | return ret; | |
752 | ||
753 | error: | |
754 | free_probes(); | |
755 | return ret; | |
096102bd | 756 | } |