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, | |
1c9a0b0e | 33 | .loaded = false, |
adfe4f5e JG |
34 | }, |
35 | { | |
36 | .name = (char *) "lttng-ring-buffer-client-overwrite", | |
37 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
1c9a0b0e | 38 | .loaded = false, |
adfe4f5e JG |
39 | }, |
40 | { | |
41 | .name = (char *) "lttng-ring-buffer-metadata-client", | |
42 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
1c9a0b0e | 43 | .loaded = false, |
adfe4f5e JG |
44 | }, |
45 | { | |
46 | .name = (char *) "lttng-ring-buffer-client-mmap-discard", | |
47 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
1c9a0b0e | 48 | .loaded = false, |
adfe4f5e JG |
49 | }, |
50 | { | |
51 | .name = (char *) "lttng-ring-buffer-client-mmap-overwrite", | |
52 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
1c9a0b0e | 53 | .loaded = false, |
adfe4f5e JG |
54 | }, |
55 | { | |
56 | .name = (char *) "lttng-ring-buffer-metadata-mmap-client", | |
57 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED, | |
1c9a0b0e | 58 | .loaded = false, |
adfe4f5e | 59 | }, |
87a15032 JR |
60 | { |
61 | .name = (char *) "lttng-ring-buffer-event_notifier-client", | |
62 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 63 | .loaded = false, |
87a15032 | 64 | }, |
90aa04a1 FD |
65 | { |
66 | .name = (char *) "lttng-counter-client-percpu-64-modular", | |
67 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 68 | .loaded = false, |
90aa04a1 FD |
69 | }, |
70 | { | |
71 | .name = (char *) "lttng-counter-client-percpu-32-modular", | |
72 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 73 | .loaded = false, |
90aa04a1 | 74 | }, |
ab57d7d3 JG |
75 | }; |
76 | ||
adfe4f5e | 77 | /* LTTng kerneltracer probe modules list */ |
fbb9748b | 78 | struct kern_modules_param kern_modules_probes_default[] = { |
adfe4f5e JG |
79 | { |
80 | .name = (char *) "lttng-probe-asoc", | |
81 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 82 | .loaded = false, |
adfe4f5e JG |
83 | }, |
84 | { | |
85 | .name = (char *) "lttng-probe-block", | |
86 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 87 | .loaded = false, |
adfe4f5e JG |
88 | }, |
89 | { | |
90 | .name = (char *) "lttng-probe-btrfs", | |
91 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 92 | .loaded = false, |
adfe4f5e JG |
93 | }, |
94 | { | |
95 | .name = (char *) "lttng-probe-compaction", | |
96 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 97 | .loaded = false, |
adfe4f5e JG |
98 | }, |
99 | { | |
100 | .name = (char *) "lttng-probe-ext3", | |
101 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 102 | .loaded = false, |
adfe4f5e JG |
103 | }, |
104 | { | |
105 | .name = (char *) "lttng-probe-ext4", | |
106 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 107 | .loaded = false, |
adfe4f5e JG |
108 | }, |
109 | { | |
110 | .name = (char *) "lttng-probe-gpio", | |
111 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 112 | .loaded = false, |
adfe4f5e JG |
113 | }, |
114 | { | |
115 | .name = (char *) "lttng-probe-i2c", | |
116 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 117 | .loaded = false, |
adfe4f5e JG |
118 | }, |
119 | { | |
120 | .name = (char *) "lttng-probe-irq", | |
121 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 122 | .loaded = false, |
adfe4f5e JG |
123 | }, |
124 | { | |
125 | .name = (char *) "lttng-probe-jbd", | |
126 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 127 | .loaded = false, |
adfe4f5e JG |
128 | }, |
129 | { | |
130 | .name = (char *) "lttng-probe-jbd2", | |
131 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 132 | .loaded = false, |
adfe4f5e JG |
133 | }, |
134 | { | |
135 | .name = (char *) "lttng-probe-kmem", | |
136 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 137 | .loaded = false, |
adfe4f5e JG |
138 | }, |
139 | { | |
140 | .name = (char *) "lttng-probe-kvm", | |
141 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 142 | .loaded = false, |
adfe4f5e JG |
143 | }, |
144 | { | |
145 | .name = (char *) "lttng-probe-kvm-x86", | |
146 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 147 | .loaded = false, |
adfe4f5e JG |
148 | }, |
149 | { | |
150 | .name = (char *) "lttng-probe-kvm-x86-mmu", | |
151 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 152 | .loaded = false, |
adfe4f5e JG |
153 | }, |
154 | { | |
155 | .name = (char *) "lttng-probe-lock", | |
156 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 157 | .loaded = false, |
adfe4f5e JG |
158 | }, |
159 | { | |
160 | .name = (char *) "lttng-probe-module", | |
161 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 162 | .loaded = false, |
adfe4f5e JG |
163 | }, |
164 | { | |
165 | .name = (char *) "lttng-probe-napi", | |
166 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 167 | .loaded = false, |
adfe4f5e JG |
168 | }, |
169 | { | |
170 | .name = (char *) "lttng-probe-net", | |
171 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 172 | .loaded = false, |
adfe4f5e JG |
173 | }, |
174 | { | |
175 | .name = (char *) "lttng-probe-power", | |
176 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 177 | .loaded = false, |
adfe4f5e JG |
178 | }, |
179 | { | |
180 | .name = (char *) "lttng-probe-preemptirq", | |
181 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 182 | .loaded = false, |
adfe4f5e JG |
183 | }, |
184 | { | |
185 | .name = (char *) "lttng-probe-printk", | |
186 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 187 | .loaded = false, |
adfe4f5e JG |
188 | }, |
189 | { | |
190 | .name = (char *) "lttng-probe-random", | |
191 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 192 | .loaded = false, |
adfe4f5e JG |
193 | }, |
194 | { | |
195 | .name = (char *) "lttng-probe-rcu", | |
196 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 197 | .loaded = false, |
adfe4f5e JG |
198 | }, |
199 | { | |
200 | .name = (char *) "lttng-probe-regmap", | |
201 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 202 | .loaded = false, |
adfe4f5e JG |
203 | }, |
204 | { | |
205 | .name = (char *) "lttng-probe-regulator", | |
206 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 207 | .loaded = false, |
adfe4f5e JG |
208 | }, |
209 | { | |
210 | .name = (char *) "lttng-probe-rpm", | |
211 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 212 | .loaded = false, |
adfe4f5e JG |
213 | }, |
214 | { | |
215 | .name = (char *) "lttng-probe-sched", | |
216 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 217 | .loaded = false, |
adfe4f5e JG |
218 | }, |
219 | { | |
220 | .name = (char *) "lttng-probe-scsi", | |
221 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 222 | .loaded = false, |
adfe4f5e JG |
223 | }, |
224 | { | |
225 | .name = (char *) "lttng-probe-signal", | |
226 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 227 | .loaded = false, |
adfe4f5e JG |
228 | }, |
229 | { | |
230 | .name = (char *) "lttng-probe-skb", | |
231 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 232 | .loaded = false, |
adfe4f5e JG |
233 | }, |
234 | { | |
235 | .name = (char *) "lttng-probe-sock", | |
236 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 237 | .loaded = false, |
adfe4f5e JG |
238 | }, |
239 | { | |
240 | .name = (char *) "lttng-probe-statedump", | |
241 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 242 | .loaded = false, |
adfe4f5e JG |
243 | }, |
244 | { | |
245 | .name = (char *) "lttng-probe-sunrpc", | |
246 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 247 | .loaded = false, |
adfe4f5e JG |
248 | }, |
249 | { | |
250 | .name = (char *) "lttng-probe-timer", | |
251 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 252 | .loaded = false, |
adfe4f5e JG |
253 | }, |
254 | { | |
255 | .name = (char *) "lttng-probe-udp", | |
256 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 257 | .loaded = false, |
adfe4f5e JG |
258 | }, |
259 | { | |
260 | .name = (char *) "lttng-probe-vmscan", | |
261 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 262 | .loaded = false, |
adfe4f5e JG |
263 | }, |
264 | { | |
265 | .name = (char *) "lttng-probe-v4l2", | |
266 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 267 | .loaded = false, |
adfe4f5e JG |
268 | }, |
269 | { | |
270 | .name = (char *) "lttng-probe-workqueue", | |
271 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 272 | .loaded = false, |
adfe4f5e JG |
273 | }, |
274 | { | |
275 | .name = (char *) "lttng-probe-writeback", | |
276 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 277 | .loaded = false, |
adfe4f5e JG |
278 | }, |
279 | { | |
280 | .name = (char *) "lttng-probe-x86-irq-vectors", | |
281 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 282 | .loaded = false, |
adfe4f5e JG |
283 | }, |
284 | { | |
285 | .name = (char *) "lttng-probe-x86-exceptions", | |
286 | .load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL, | |
1c9a0b0e | 287 | .loaded = false, |
adfe4f5e | 288 | }, |
096102bd DG |
289 | }; |
290 | ||
fbb9748b JG |
291 | /* dynamic probe modules list */ |
292 | static struct kern_modules_param *probes; | |
293 | static int nr_probes; | |
c9d42407 | 294 | static int probes_capacity; |
fbb9748b | 295 | |
ce7fc42f | 296 | #ifdef HAVE_KMOD |
234170ac | 297 | #include <libkmod.h> |
866c17ce | 298 | |
d11b2027 MJ |
299 | /** |
300 | * @brief Logging function for libkmod integration. | |
301 | */ | |
d22ad5f8 | 302 | static ATTR_FORMAT_PRINTF(6, 0) |
f46376a1 MJ |
303 | void log_kmod(void *data __attribute__((unused)), |
304 | int priority __attribute__((unused)), | |
305 | const char *file __attribute__((unused)), | |
306 | int line __attribute__((unused)), | |
307 | const char *fn __attribute__((unused)), | |
308 | const char *format, va_list args) | |
234170ac UTL |
309 | { |
310 | char *str; | |
311 | ||
312 | if (vasprintf(&str, format, args) < 0) { | |
313 | return; | |
314 | } | |
315 | ||
316 | DBG("libkmod: %s", str); | |
317 | free(str); | |
318 | } | |
866c17ce | 319 | |
d11b2027 MJ |
320 | /** |
321 | * @brief Setup the libkmod context. | |
322 | * | |
323 | * Create the context, add a custom logging function and preload the | |
324 | * ressources for faster operation. | |
325 | * | |
326 | * @returns \c 0 on success | |
327 | * \c < 0 on error | |
328 | */ | |
866c17ce | 329 | static int setup_kmod_ctx(struct kmod_ctx **ctx) |
234170ac | 330 | { |
866c17ce | 331 | int ret = 0; |
234170ac | 332 | |
866c17ce | 333 | *ctx = kmod_new(NULL, NULL); |
234170ac UTL |
334 | if (!ctx) { |
335 | PERROR("Unable to create kmod library context"); | |
336 | ret = -ENOMEM; | |
337 | goto error; | |
338 | } | |
339 | ||
d22ad5f8 SM |
340 | /* |
341 | * Parameter 2 of kmod_set_log_fn generates a | |
342 | * -Wsuggest-attribute=formatkmod_set_log_fn warning that we can't fix, | |
343 | * ignore it. | |
344 | */ | |
345 | DIAGNOSTIC_PUSH | |
346 | DIAGNOSTIC_IGNORE_SUGGEST_ATTRIBUTE_FORMAT | |
866c17ce | 347 | kmod_set_log_fn(*ctx, log_kmod, NULL); |
d22ad5f8 | 348 | DIAGNOSTIC_POP |
866c17ce MJ |
349 | ret = kmod_load_resources(*ctx); |
350 | if (ret < 0) { | |
351 | ERR("Failed to load kmod library resources"); | |
352 | goto error; | |
353 | } | |
354 | ||
355 | error: | |
356 | return ret; | |
357 | } | |
358 | ||
d11b2027 MJ |
359 | /** |
360 | * @brief Loads the kernel modules in \p modules | |
361 | * | |
362 | * @param modules List of modules to load | |
363 | * @param entries Number of modules in the list | |
d11b2027 MJ |
364 | * |
365 | * If the modules are required, we will return with error after the | |
366 | * first failed module load, otherwise we continue loading. | |
367 | * | |
368 | * @returns \c 0 on success | |
369 | * \c < 0 on error | |
370 | */ | |
866c17ce | 371 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 372 | int entries) |
866c17ce MJ |
373 | { |
374 | int ret = 0, i; | |
375 | struct kmod_ctx *ctx; | |
376 | ||
377 | ret = setup_kmod_ctx(&ctx); | |
378 | if (ret < 0) { | |
379 | goto error; | |
380 | } | |
234170ac UTL |
381 | |
382 | for (i = 0; i < entries; i++) { | |
383 | struct kmod_module *mod = NULL; | |
384 | ||
385 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
386 | if (ret < 0) { | |
387 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
388 | goto error; | |
389 | } | |
390 | ||
0b1e16b8 | 391 | ret = kmod_module_probe_insert_module(mod, 0, |
234170ac | 392 | NULL, NULL, NULL, NULL); |
0b1e16b8 MJ |
393 | if (ret == -EEXIST) { |
394 | DBG("Module %s is already loaded", modules[i].name); | |
395 | ret = 0; | |
396 | } else if (ret < 0) { | |
adfe4f5e | 397 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
398 | ERR("Unable to load required module %s", |
399 | modules[i].name); | |
400 | goto error; | |
401 | } else { | |
402 | DBG("Unable to load optional module %s; continuing", | |
403 | modules[i].name); | |
404 | ret = 0; | |
405 | } | |
234170ac UTL |
406 | } else { |
407 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 408 | modules[i].loaded = true; |
234170ac UTL |
409 | } |
410 | ||
411 | kmod_module_unref(mod); | |
412 | } | |
413 | ||
414 | error: | |
415 | if (ctx) { | |
416 | kmod_unref(ctx); | |
417 | } | |
418 | return ret; | |
419 | } | |
420 | ||
d11b2027 MJ |
421 | /** |
422 | * @brief Recursively unload modules. | |
423 | * | |
424 | * This function implements the same modules unloading behavior as | |
425 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
426 | * dependencies and unload modules with a refcount of 0. | |
427 | * | |
428 | * @param mod The module to unload | |
429 | * | |
430 | * @returns \c 0 on success | |
431 | * \c < 0 on error | |
432 | */ | |
866c17ce MJ |
433 | static int rmmod_recurse(struct kmod_module *mod) { |
434 | int ret = 0; | |
435 | struct kmod_list *deps, *itr; | |
436 | ||
437 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
438 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | ret = kmod_module_remove_module(mod, 0); | |
443 | ||
444 | deps = kmod_module_get_dependencies(mod); | |
445 | if (deps != NULL) { | |
446 | kmod_list_foreach(itr, deps) { | |
447 | struct kmod_module *dep = kmod_module_get_module(itr); | |
448 | if (kmod_module_get_refcnt(dep) == 0) { | |
449 | DBG("Recursive remove module %s", | |
450 | kmod_module_get_name(dep)); | |
451 | rmmod_recurse(dep); | |
452 | } | |
453 | kmod_module_unref(dep); | |
454 | } | |
455 | kmod_module_unref_list(deps); | |
456 | } | |
457 | ||
458 | return ret; | |
459 | } | |
460 | ||
d11b2027 MJ |
461 | /** |
462 | * @brief Unloads the kernel modules in \p modules | |
463 | * | |
464 | * @param modules List of modules to unload | |
465 | * @param entries Number of modules in the list | |
d11b2027 MJ |
466 | * |
467 | */ | |
866c17ce | 468 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 469 | int entries) |
866c17ce MJ |
470 | { |
471 | int ret = 0, i; | |
472 | struct kmod_ctx *ctx; | |
473 | ||
474 | ret = setup_kmod_ctx(&ctx); | |
475 | if (ret < 0) { | |
476 | goto error; | |
477 | } | |
478 | ||
479 | for (i = entries - 1; i >= 0; i--) { | |
480 | struct kmod_module *mod = NULL; | |
481 | ||
4ad664a0 JG |
482 | if (!modules[i].loaded) { |
483 | continue; | |
484 | } | |
485 | ||
866c17ce MJ |
486 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
487 | if (ret < 0) { | |
488 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
489 | goto error; | |
490 | } | |
491 | ||
492 | ret = rmmod_recurse(mod); | |
493 | if (ret == -EEXIST) { | |
494 | DBG("Module %s is not in kernel.", modules[i].name); | |
adfe4f5e | 495 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && ret < 0) { |
866c17ce MJ |
496 | ERR("Unable to remove module %s", modules[i].name); |
497 | } else { | |
498 | DBG("Modprobe removal successful %s", | |
499 | modules[i].name); | |
500 | } | |
501 | ||
502 | kmod_module_unref(mod); | |
503 | } | |
504 | ||
505 | error: | |
506 | if (ctx) { | |
507 | kmod_unref(ctx); | |
508 | } | |
509 | } | |
510 | ||
234170ac UTL |
511 | #else /* HAVE_KMOD */ |
512 | ||
fbb9748b | 513 | static int modprobe_lttng(struct kern_modules_param *modules, |
adfe4f5e | 514 | int entries) |
096102bd DG |
515 | { |
516 | int ret = 0, i; | |
517 | char modprobe[256]; | |
518 | ||
e23b81ed | 519 | for (i = 0; i < entries; i++) { |
096102bd DG |
520 | ret = snprintf(modprobe, sizeof(modprobe), |
521 | "/sbin/modprobe %s%s", | |
adfe4f5e | 522 | modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED ? "" : "-q ", |
e23b81ed | 523 | modules[i].name); |
096102bd DG |
524 | if (ret < 0) { |
525 | PERROR("snprintf modprobe"); | |
526 | goto error; | |
527 | } | |
528 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
529 | ret = system(modprobe); | |
530 | if (ret == -1) { | |
adfe4f5e | 531 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
532 | ERR("Unable to launch modprobe for required module %s", |
533 | modules[i].name); | |
534 | goto error; | |
535 | } else { | |
536 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
537 | modules[i].name); | |
538 | ret = 0; | |
539 | } | |
540 | } else if (WEXITSTATUS(ret) != 0) { | |
adfe4f5e | 541 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
16c2e854 PP |
542 | ERR("Unable to load required module %s", |
543 | modules[i].name); | |
544 | goto error; | |
545 | } else { | |
546 | DBG("Unable to load optional module %s; continuing", | |
547 | modules[i].name); | |
548 | ret = 0; | |
549 | } | |
096102bd | 550 | } else { |
ab57d7d3 | 551 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 552 | modules[i].loaded = true; |
096102bd DG |
553 | } |
554 | } | |
555 | ||
556 | error: | |
557 | return ret; | |
558 | } | |
559 | ||
35e090b7 | 560 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, |
adfe4f5e | 561 | int entries) |
35e090b7 MJ |
562 | { |
563 | int ret = 0, i; | |
564 | char modprobe[256]; | |
565 | ||
566 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
567 | if (!modules[i].loaded) { |
568 | continue; | |
569 | } | |
35e090b7 MJ |
570 | ret = snprintf(modprobe, sizeof(modprobe), |
571 | "/sbin/modprobe -r -q %s", | |
572 | modules[i].name); | |
573 | if (ret < 0) { | |
574 | PERROR("snprintf modprobe -r"); | |
575 | return; | |
576 | } | |
577 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
578 | ret = system(modprobe); | |
579 | if (ret == -1) { | |
1d25334c FD |
580 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
581 | ERR("Unable to launch modprobe -r for required module %s", | |
582 | modules[i].name); | |
583 | } else { | |
584 | DBG("Unable to launch modprobe -r for optional module %s", | |
585 | modules[i].name); | |
586 | } | |
587 | } else if (WEXITSTATUS(ret) != 0) { | |
588 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { | |
589 | ERR("Unable to remove required module %s", | |
590 | modules[i].name); | |
591 | } else { | |
592 | DBG("Unable to remove optional module %s", | |
593 | modules[i].name); | |
594 | } | |
35e090b7 | 595 | } else { |
1d25334c | 596 | DBG("Modprobe removal successful %s", modules[i].name); |
35e090b7 MJ |
597 | } |
598 | } | |
599 | } | |
600 | ||
866c17ce MJ |
601 | #endif /* HAVE_KMOD */ |
602 | ||
35e090b7 MJ |
603 | /* |
604 | * Remove control kernel module(s) in reverse load order. | |
605 | */ | |
606 | void modprobe_remove_lttng_control(void) | |
607 | { | |
608 | modprobe_remove_lttng(kern_modules_control_core, | |
adfe4f5e | 609 | ARRAY_SIZE(kern_modules_control_core)); |
35e090b7 MJ |
610 | } |
611 | ||
612 | static void free_probes(void) | |
613 | { | |
614 | int i; | |
615 | ||
616 | if (!probes) { | |
617 | return; | |
618 | } | |
619 | for (i = 0; i < nr_probes; ++i) { | |
620 | free(probes[i].name); | |
621 | } | |
622 | free(probes); | |
623 | probes = NULL; | |
624 | nr_probes = 0; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Remove data kernel modules in reverse load order. | |
629 | */ | |
630 | void modprobe_remove_lttng_data(void) | |
631 | { | |
632 | if (!probes) { | |
633 | return; | |
634 | } | |
adfe4f5e JG |
635 | |
636 | modprobe_remove_lttng(probes, nr_probes); | |
35e090b7 MJ |
637 | free_probes(); |
638 | } | |
639 | ||
640 | /* | |
641 | * Remove all kernel modules in reverse order. | |
642 | */ | |
643 | void modprobe_remove_lttng_all(void) | |
644 | { | |
645 | modprobe_remove_lttng_data(); | |
646 | modprobe_remove_lttng_control(); | |
647 | } | |
648 | ||
e23b81ed JG |
649 | /* |
650 | * Load control kernel module(s). | |
651 | */ | |
652 | int modprobe_lttng_control(void) | |
653 | { | |
adfe4f5e JG |
654 | return modprobe_lttng(kern_modules_control_core, |
655 | ARRAY_SIZE(kern_modules_control_core)); | |
e23b81ed | 656 | } |
ab57d7d3 | 657 | |
c9d42407 PP |
658 | /** |
659 | * Grow global list of probes (double capacity or set it to 1 if | |
660 | * currently 0 and copy existing data). | |
096102bd | 661 | */ |
c9d42407 | 662 | static int grow_probes(void) |
096102bd | 663 | { |
c9d42407 PP |
664 | int i; |
665 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 666 | |
c9d42407 PP |
667 | /* Initialize capacity to 1 if 0. */ |
668 | if (probes_capacity == 0) { | |
7966af57 | 669 | probes = (kern_modules_param *) zmalloc(sizeof(*probes)); |
c9d42407 PP |
670 | if (!probes) { |
671 | PERROR("malloc probe list"); | |
672 | return -ENOMEM; | |
673 | } | |
674 | ||
675 | probes_capacity = 1; | |
676 | return 0; | |
fbb9748b JG |
677 | } |
678 | ||
c9d42407 PP |
679 | /* Double size. */ |
680 | probes_capacity *= 2; | |
681 | ||
7966af57 | 682 | tmp_probes = (kern_modules_param *) zmalloc(sizeof(*tmp_probes) * probes_capacity); |
c9d42407 | 683 | if (!tmp_probes) { |
fbb9748b JG |
684 | PERROR("malloc probe list"); |
685 | return -ENOMEM; | |
686 | } | |
687 | ||
c9d42407 | 688 | for (i = 0; i < nr_probes; ++i) { |
adfe4f5e JG |
689 | /* Ownership of 'name' field is transferred. */ |
690 | tmp_probes[i] = probes[i]; | |
c9d42407 PP |
691 | } |
692 | ||
693 | /* Replace probes with larger copy. */ | |
694 | free(probes); | |
695 | probes = tmp_probes; | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Appends a comma-separated list of probes to the global list | |
702 | * of probes. | |
703 | */ | |
704 | static int append_list_to_probes(const char *list) | |
705 | { | |
706 | char *next; | |
d3c04b7c | 707 | int ret; |
50e0fa5f | 708 | char *tmp_list, *cur_list, *saveptr; |
c9d42407 | 709 | |
a0377dfe | 710 | LTTNG_ASSERT(list); |
c9d42407 | 711 | |
44603c80 | 712 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
713 | if (!tmp_list) { |
714 | PERROR("strdup temp list"); | |
715 | return -ENOMEM; | |
716 | } | |
717 | ||
718 | for (;;) { | |
fbb9748b | 719 | size_t name_len; |
c9d42407 | 720 | struct kern_modules_param *cur_mod; |
fbb9748b | 721 | |
50e0fa5f | 722 | next = strtok_r(cur_list, ",", &saveptr); |
fbb9748b | 723 | if (!next) { |
c9d42407 | 724 | break; |
fbb9748b | 725 | } |
44603c80 | 726 | cur_list = NULL; |
fbb9748b JG |
727 | |
728 | /* filter leading spaces */ | |
729 | while (*next == ' ') { | |
730 | next++; | |
731 | } | |
732 | ||
c9d42407 PP |
733 | if (probes_capacity <= nr_probes) { |
734 | ret = grow_probes(); | |
735 | if (ret) { | |
398d5459 | 736 | goto error; |
c9d42407 PP |
737 | } |
738 | } | |
739 | ||
fbb9748b JG |
740 | /* Length 13 is "lttng-probe-" + \0 */ |
741 | name_len = strlen(next) + 13; | |
742 | ||
d3c04b7c | 743 | cur_mod = &probes[nr_probes]; |
7966af57 | 744 | cur_mod->name = (char *) zmalloc(name_len); |
c9d42407 | 745 | if (!cur_mod->name) { |
fbb9748b | 746 | PERROR("malloc probe list"); |
398d5459 MD |
747 | ret = -ENOMEM; |
748 | goto error; | |
fbb9748b JG |
749 | } |
750 | ||
c9d42407 | 751 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
752 | if (ret < 0) { |
753 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
754 | ret = -ENOMEM; |
755 | goto error; | |
fbb9748b | 756 | } |
c9d42407 | 757 | |
adfe4f5e JG |
758 | cur_mod->load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL; |
759 | ||
c9d42407 | 760 | nr_probes++; |
fbb9748b JG |
761 | } |
762 | ||
c9d42407 | 763 | free(tmp_list); |
c9d42407 | 764 | return 0; |
398d5459 MD |
765 | |
766 | error: | |
767 | free(tmp_list); | |
768 | free_probes(); | |
769 | return ret; | |
c9d42407 PP |
770 | } |
771 | ||
772 | /* | |
773 | * Load data kernel module(s). | |
774 | */ | |
775 | int modprobe_lttng_data(void) | |
776 | { | |
777 | int ret, i; | |
778 | char *list; | |
779 | ||
780 | /* | |
781 | * Base probes: either from command line option, environment | |
782 | * variable or default list. | |
783 | */ | |
412d7227 | 784 | list = the_config.kmod_probes_list.value; |
c9d42407 PP |
785 | if (list) { |
786 | /* User-specified probes. */ | |
787 | ret = append_list_to_probes(list); | |
c9d42407 PP |
788 | if (ret) { |
789 | return ret; | |
790 | } | |
791 | } else { | |
792 | /* Default probes. */ | |
793 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 794 | |
7966af57 | 795 | probes = (kern_modules_param *) zmalloc(sizeof(*probes) * def_len); |
c9d42407 PP |
796 | if (!probes) { |
797 | PERROR("malloc probe list"); | |
798 | return -ENOMEM; | |
799 | } | |
800 | ||
801 | nr_probes = probes_capacity = def_len; | |
802 | ||
803 | for (i = 0; i < def_len; ++i) { | |
804 | char* name = strdup(kern_modules_probes_default[i].name); | |
805 | ||
806 | if (!name) { | |
807 | PERROR("strdup probe item"); | |
398d5459 MD |
808 | ret = -ENOMEM; |
809 | goto error; | |
c9d42407 PP |
810 | } |
811 | ||
812 | probes[i].name = name; | |
adfe4f5e | 813 | probes[i].load_policy = kern_modules_probes_default[i].load_policy; |
c9d42407 PP |
814 | } |
815 | } | |
816 | ||
817 | /* | |
818 | * Extra modules? Append them to current probes list. | |
819 | */ | |
412d7227 | 820 | list = the_config.kmod_extra_probes_list.value; |
c9d42407 PP |
821 | if (list) { |
822 | ret = append_list_to_probes(list); | |
823 | if (ret) { | |
398d5459 | 824 | goto error; |
c9d42407 PP |
825 | } |
826 | } | |
827 | ||
828 | /* | |
829 | * Load probes modules now. | |
830 | */ | |
adfe4f5e | 831 | ret = modprobe_lttng(probes, nr_probes); |
398d5459 MD |
832 | if (ret) { |
833 | goto error; | |
834 | } | |
835 | return ret; | |
836 | ||
837 | error: | |
838 | free_probes(); | |
839 | return ret; | |
096102bd | 840 | } |