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 |
28ab034a JG |
17 | #include "kern-modules.hpp" |
18 | #include "lttng-sessiond.hpp" | |
19 | #include "modprobe.hpp" | |
096102bd | 20 | |
c9e313bc SM |
21 | #include <common/common.hpp> |
22 | #include <common/utils.hpp> | |
096102bd | 23 | |
28ab034a JG |
24 | #include <stdio.h> |
25 | #include <stdlib.h> | |
26 | #include <sys/wait.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 | */ | |
28ab034a JG |
302 | static ATTR_FORMAT_PRINTF(6, 0) void log_kmod(void *data __attribute__((unused)), |
303 | int priority __attribute__((unused)), | |
304 | const char *file __attribute__((unused)), | |
305 | int line __attribute__((unused)), | |
306 | const char *fn __attribute__((unused)), | |
307 | const char *format, | |
308 | 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 | |
cd9adb8b | 333 | *ctx = kmod_new(nullptr, nullptr); |
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 | |
cd9adb8b | 347 | kmod_set_log_fn(*ctx, log_kmod, nullptr); |
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 | */ | |
28ab034a | 371 | static int modprobe_lttng(struct kern_modules_param *modules, int entries) |
866c17ce MJ |
372 | { |
373 | int ret = 0, i; | |
374 | struct kmod_ctx *ctx; | |
375 | ||
376 | ret = setup_kmod_ctx(&ctx); | |
377 | if (ret < 0) { | |
378 | goto error; | |
379 | } | |
234170ac UTL |
380 | |
381 | for (i = 0; i < entries; i++) { | |
cd9adb8b | 382 | struct kmod_module *mod = nullptr; |
234170ac UTL |
383 | |
384 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); | |
385 | if (ret < 0) { | |
386 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
387 | goto error; | |
388 | } | |
389 | ||
cd9adb8b | 390 | ret = kmod_module_probe_insert_module(mod, 0, nullptr, nullptr, nullptr, nullptr); |
0b1e16b8 MJ |
391 | if (ret == -EEXIST) { |
392 | DBG("Module %s is already loaded", modules[i].name); | |
393 | ret = 0; | |
394 | } else if (ret < 0) { | |
adfe4f5e | 395 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
28ab034a | 396 | ERR("Unable to load required module %s", modules[i].name); |
16c2e854 PP |
397 | goto error; |
398 | } else { | |
399 | DBG("Unable to load optional module %s; continuing", | |
28ab034a | 400 | modules[i].name); |
16c2e854 PP |
401 | ret = 0; |
402 | } | |
234170ac UTL |
403 | } else { |
404 | DBG("Modprobe successfully %s", modules[i].name); | |
4ad664a0 | 405 | modules[i].loaded = true; |
234170ac UTL |
406 | } |
407 | ||
408 | kmod_module_unref(mod); | |
409 | } | |
410 | ||
411 | error: | |
412 | if (ctx) { | |
413 | kmod_unref(ctx); | |
414 | } | |
415 | return ret; | |
416 | } | |
417 | ||
d11b2027 MJ |
418 | /** |
419 | * @brief Recursively unload modules. | |
420 | * | |
421 | * This function implements the same modules unloading behavior as | |
422 | * 'modprobe -r' or rmmod, it will recursevily go trought the \p module | |
423 | * dependencies and unload modules with a refcount of 0. | |
424 | * | |
425 | * @param mod The module to unload | |
426 | * | |
427 | * @returns \c 0 on success | |
428 | * \c < 0 on error | |
429 | */ | |
28ab034a JG |
430 | static int rmmod_recurse(struct kmod_module *mod) |
431 | { | |
866c17ce MJ |
432 | int ret = 0; |
433 | struct kmod_list *deps, *itr; | |
434 | ||
435 | if (kmod_module_get_initstate(mod) == KMOD_MODULE_BUILTIN) { | |
436 | DBG("Module %s is builtin", kmod_module_get_name(mod)); | |
437 | return ret; | |
438 | } | |
439 | ||
440 | ret = kmod_module_remove_module(mod, 0); | |
441 | ||
442 | deps = kmod_module_get_dependencies(mod); | |
cd9adb8b | 443 | if (deps != nullptr) { |
28ab034a JG |
444 | kmod_list_foreach(itr, deps) |
445 | { | |
866c17ce MJ |
446 | struct kmod_module *dep = kmod_module_get_module(itr); |
447 | if (kmod_module_get_refcnt(dep) == 0) { | |
28ab034a | 448 | DBG("Recursive remove module %s", kmod_module_get_name(dep)); |
866c17ce MJ |
449 | rmmod_recurse(dep); |
450 | } | |
451 | kmod_module_unref(dep); | |
452 | } | |
453 | kmod_module_unref_list(deps); | |
454 | } | |
455 | ||
456 | return ret; | |
457 | } | |
458 | ||
d11b2027 MJ |
459 | /** |
460 | * @brief Unloads the kernel modules in \p modules | |
461 | * | |
462 | * @param modules List of modules to unload | |
463 | * @param entries Number of modules in the list | |
d11b2027 MJ |
464 | * |
465 | */ | |
28ab034a | 466 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, int entries) |
866c17ce MJ |
467 | { |
468 | int ret = 0, i; | |
469 | struct kmod_ctx *ctx; | |
470 | ||
471 | ret = setup_kmod_ctx(&ctx); | |
472 | if (ret < 0) { | |
473 | goto error; | |
474 | } | |
475 | ||
476 | for (i = entries - 1; i >= 0; i--) { | |
cd9adb8b | 477 | struct kmod_module *mod = nullptr; |
866c17ce | 478 | |
4ad664a0 JG |
479 | if (!modules[i].loaded) { |
480 | continue; | |
481 | } | |
482 | ||
866c17ce MJ |
483 | ret = kmod_module_new_from_name(ctx, modules[i].name, &mod); |
484 | if (ret < 0) { | |
485 | PERROR("Failed to create kmod module for %s", modules[i].name); | |
486 | goto error; | |
487 | } | |
488 | ||
489 | ret = rmmod_recurse(mod); | |
490 | if (ret == -EEXIST) { | |
491 | DBG("Module %s is not in kernel.", modules[i].name); | |
28ab034a JG |
492 | } else if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED && |
493 | ret < 0) { | |
866c17ce MJ |
494 | ERR("Unable to remove module %s", modules[i].name); |
495 | } else { | |
28ab034a | 496 | DBG("Modprobe removal successful %s", modules[i].name); |
866c17ce MJ |
497 | } |
498 | ||
499 | kmod_module_unref(mod); | |
500 | } | |
501 | ||
502 | error: | |
503 | if (ctx) { | |
504 | kmod_unref(ctx); | |
505 | } | |
506 | } | |
507 | ||
234170ac UTL |
508 | #else /* HAVE_KMOD */ |
509 | ||
28ab034a | 510 | static int modprobe_lttng(struct kern_modules_param *modules, int entries) |
096102bd DG |
511 | { |
512 | int ret = 0, i; | |
513 | char modprobe[256]; | |
514 | ||
e23b81ed | 515 | for (i = 0; i < entries; i++) { |
28ab034a JG |
516 | ret = snprintf(modprobe, |
517 | sizeof(modprobe), | |
518 | "/sbin/modprobe %s%s", | |
519 | modules[i].load_policy == | |
520 | KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED ? | |
521 | "" : | |
522 | "-q ", | |
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 | 532 | ERR("Unable to launch modprobe for required module %s", |
28ab034a | 533 | modules[i].name); |
16c2e854 PP |
534 | goto error; |
535 | } else { | |
536 | DBG("Unable to launch modprobe for optional module %s; continuing", | |
28ab034a | 537 | modules[i].name); |
16c2e854 PP |
538 | ret = 0; |
539 | } | |
540 | } else if (WEXITSTATUS(ret) != 0) { | |
adfe4f5e | 541 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
28ab034a | 542 | ERR("Unable to load required module %s", modules[i].name); |
16c2e854 PP |
543 | goto error; |
544 | } else { | |
545 | DBG("Unable to load optional module %s; continuing", | |
28ab034a | 546 | modules[i].name); |
16c2e854 PP |
547 | ret = 0; |
548 | } | |
096102bd | 549 | } else { |
ab57d7d3 | 550 | DBG("Modprobe successfully %s", modules[i].name); |
355d2778 | 551 | modules[i].loaded = true; |
096102bd DG |
552 | } |
553 | } | |
554 | ||
555 | error: | |
556 | return ret; | |
557 | } | |
558 | ||
28ab034a | 559 | static void modprobe_remove_lttng(const struct kern_modules_param *modules, int entries) |
35e090b7 MJ |
560 | { |
561 | int ret = 0, i; | |
562 | char modprobe[256]; | |
563 | ||
564 | for (i = entries - 1; i >= 0; i--) { | |
4ad664a0 JG |
565 | if (!modules[i].loaded) { |
566 | continue; | |
567 | } | |
28ab034a JG |
568 | ret = snprintf( |
569 | modprobe, sizeof(modprobe), "/sbin/modprobe -r -q %s", modules[i].name); | |
35e090b7 MJ |
570 | if (ret < 0) { |
571 | PERROR("snprintf modprobe -r"); | |
572 | return; | |
573 | } | |
574 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
575 | ret = system(modprobe); | |
576 | if (ret == -1) { | |
1d25334c FD |
577 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { |
578 | ERR("Unable to launch modprobe -r for required module %s", | |
28ab034a | 579 | modules[i].name); |
1d25334c FD |
580 | } else { |
581 | DBG("Unable to launch modprobe -r for optional module %s", | |
28ab034a | 582 | modules[i].name); |
1d25334c FD |
583 | } |
584 | } else if (WEXITSTATUS(ret) != 0) { | |
585 | if (modules[i].load_policy == KERNEL_MODULE_PROPERTY_LOAD_POLICY_REQUIRED) { | |
28ab034a | 586 | ERR("Unable to remove required module %s", modules[i].name); |
1d25334c | 587 | } else { |
28ab034a | 588 | DBG("Unable to remove optional module %s", modules[i].name); |
1d25334c | 589 | } |
35e090b7 | 590 | } else { |
1d25334c | 591 | DBG("Modprobe removal successful %s", modules[i].name); |
35e090b7 MJ |
592 | } |
593 | } | |
594 | } | |
595 | ||
866c17ce MJ |
596 | #endif /* HAVE_KMOD */ |
597 | ||
35e090b7 MJ |
598 | /* |
599 | * Remove control kernel module(s) in reverse load order. | |
600 | */ | |
cd9adb8b | 601 | void modprobe_remove_lttng_control() |
35e090b7 | 602 | { |
28ab034a | 603 | modprobe_remove_lttng(kern_modules_control_core, ARRAY_SIZE(kern_modules_control_core)); |
35e090b7 MJ |
604 | } |
605 | ||
cd9adb8b | 606 | static void free_probes() |
35e090b7 MJ |
607 | { |
608 | int i; | |
609 | ||
610 | if (!probes) { | |
611 | return; | |
612 | } | |
613 | for (i = 0; i < nr_probes; ++i) { | |
614 | free(probes[i].name); | |
615 | } | |
616 | free(probes); | |
cd9adb8b | 617 | probes = nullptr; |
35e090b7 MJ |
618 | nr_probes = 0; |
619 | } | |
620 | ||
621 | /* | |
622 | * Remove data kernel modules in reverse load order. | |
623 | */ | |
cd9adb8b | 624 | void modprobe_remove_lttng_data() |
35e090b7 MJ |
625 | { |
626 | if (!probes) { | |
627 | return; | |
628 | } | |
adfe4f5e JG |
629 | |
630 | modprobe_remove_lttng(probes, nr_probes); | |
35e090b7 MJ |
631 | free_probes(); |
632 | } | |
633 | ||
634 | /* | |
635 | * Remove all kernel modules in reverse order. | |
636 | */ | |
cd9adb8b | 637 | void modprobe_remove_lttng_all() |
35e090b7 MJ |
638 | { |
639 | modprobe_remove_lttng_data(); | |
640 | modprobe_remove_lttng_control(); | |
641 | } | |
642 | ||
e23b81ed JG |
643 | /* |
644 | * Load control kernel module(s). | |
645 | */ | |
cd9adb8b | 646 | int modprobe_lttng_control() |
e23b81ed | 647 | { |
28ab034a | 648 | return modprobe_lttng(kern_modules_control_core, ARRAY_SIZE(kern_modules_control_core)); |
e23b81ed | 649 | } |
ab57d7d3 | 650 | |
c9d42407 PP |
651 | /** |
652 | * Grow global list of probes (double capacity or set it to 1 if | |
653 | * currently 0 and copy existing data). | |
096102bd | 654 | */ |
cd9adb8b | 655 | static int grow_probes() |
096102bd | 656 | { |
c9d42407 PP |
657 | int i; |
658 | struct kern_modules_param *tmp_probes; | |
fbb9748b | 659 | |
c9d42407 PP |
660 | /* Initialize capacity to 1 if 0. */ |
661 | if (probes_capacity == 0) { | |
64803277 | 662 | probes = zmalloc<kern_modules_param>(); |
c9d42407 PP |
663 | if (!probes) { |
664 | PERROR("malloc probe list"); | |
665 | return -ENOMEM; | |
666 | } | |
667 | ||
668 | probes_capacity = 1; | |
669 | return 0; | |
fbb9748b JG |
670 | } |
671 | ||
c9d42407 PP |
672 | /* Double size. */ |
673 | probes_capacity *= 2; | |
674 | ||
64803277 | 675 | tmp_probes = calloc<kern_modules_param>(probes_capacity); |
c9d42407 | 676 | if (!tmp_probes) { |
fbb9748b JG |
677 | PERROR("malloc probe list"); |
678 | return -ENOMEM; | |
679 | } | |
680 | ||
c9d42407 | 681 | for (i = 0; i < nr_probes; ++i) { |
adfe4f5e JG |
682 | /* Ownership of 'name' field is transferred. */ |
683 | tmp_probes[i] = probes[i]; | |
c9d42407 PP |
684 | } |
685 | ||
686 | /* Replace probes with larger copy. */ | |
687 | free(probes); | |
688 | probes = tmp_probes; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Appends a comma-separated list of probes to the global list | |
695 | * of probes. | |
696 | */ | |
697 | static int append_list_to_probes(const char *list) | |
698 | { | |
699 | char *next; | |
d3c04b7c | 700 | int ret; |
50e0fa5f | 701 | char *tmp_list, *cur_list, *saveptr; |
c9d42407 | 702 | |
a0377dfe | 703 | LTTNG_ASSERT(list); |
c9d42407 | 704 | |
44603c80 | 705 | cur_list = tmp_list = strdup(list); |
c9d42407 PP |
706 | if (!tmp_list) { |
707 | PERROR("strdup temp list"); | |
708 | return -ENOMEM; | |
709 | } | |
710 | ||
711 | for (;;) { | |
fbb9748b | 712 | size_t name_len; |
c9d42407 | 713 | struct kern_modules_param *cur_mod; |
fbb9748b | 714 | |
50e0fa5f | 715 | next = strtok_r(cur_list, ",", &saveptr); |
fbb9748b | 716 | if (!next) { |
c9d42407 | 717 | break; |
fbb9748b | 718 | } |
cd9adb8b | 719 | cur_list = nullptr; |
fbb9748b JG |
720 | |
721 | /* filter leading spaces */ | |
722 | while (*next == ' ') { | |
723 | next++; | |
724 | } | |
725 | ||
c9d42407 PP |
726 | if (probes_capacity <= nr_probes) { |
727 | ret = grow_probes(); | |
728 | if (ret) { | |
398d5459 | 729 | goto error; |
c9d42407 PP |
730 | } |
731 | } | |
732 | ||
fbb9748b JG |
733 | /* Length 13 is "lttng-probe-" + \0 */ |
734 | name_len = strlen(next) + 13; | |
735 | ||
d3c04b7c | 736 | cur_mod = &probes[nr_probes]; |
64803277 | 737 | cur_mod->name = calloc<char>(name_len); |
c9d42407 | 738 | if (!cur_mod->name) { |
fbb9748b | 739 | PERROR("malloc probe list"); |
398d5459 MD |
740 | ret = -ENOMEM; |
741 | goto error; | |
fbb9748b JG |
742 | } |
743 | ||
c9d42407 | 744 | ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next); |
fbb9748b JG |
745 | if (ret < 0) { |
746 | PERROR("snprintf modprobe name"); | |
398d5459 MD |
747 | ret = -ENOMEM; |
748 | goto error; | |
fbb9748b | 749 | } |
c9d42407 | 750 | |
adfe4f5e JG |
751 | cur_mod->load_policy = KERNEL_MODULE_PROPERTY_LOAD_POLICY_OPTIONAL; |
752 | ||
c9d42407 | 753 | nr_probes++; |
fbb9748b JG |
754 | } |
755 | ||
c9d42407 | 756 | free(tmp_list); |
c9d42407 | 757 | return 0; |
398d5459 MD |
758 | |
759 | error: | |
760 | free(tmp_list); | |
761 | free_probes(); | |
762 | return ret; | |
c9d42407 PP |
763 | } |
764 | ||
765 | /* | |
766 | * Load data kernel module(s). | |
767 | */ | |
cd9adb8b | 768 | int modprobe_lttng_data() |
c9d42407 PP |
769 | { |
770 | int ret, i; | |
771 | char *list; | |
772 | ||
773 | /* | |
774 | * Base probes: either from command line option, environment | |
775 | * variable or default list. | |
776 | */ | |
412d7227 | 777 | list = the_config.kmod_probes_list.value; |
c9d42407 PP |
778 | if (list) { |
779 | /* User-specified probes. */ | |
780 | ret = append_list_to_probes(list); | |
c9d42407 PP |
781 | if (ret) { |
782 | return ret; | |
783 | } | |
784 | } else { | |
785 | /* Default probes. */ | |
786 | int def_len = ARRAY_SIZE(kern_modules_probes_default); | |
c9d42407 | 787 | |
64803277 | 788 | probes = calloc<kern_modules_param>(def_len); |
c9d42407 PP |
789 | if (!probes) { |
790 | PERROR("malloc probe list"); | |
791 | return -ENOMEM; | |
792 | } | |
793 | ||
794 | nr_probes = probes_capacity = def_len; | |
795 | ||
796 | for (i = 0; i < def_len; ++i) { | |
28ab034a | 797 | char *name = strdup(kern_modules_probes_default[i].name); |
c9d42407 PP |
798 | |
799 | if (!name) { | |
800 | PERROR("strdup probe item"); | |
398d5459 MD |
801 | ret = -ENOMEM; |
802 | goto error; | |
c9d42407 PP |
803 | } |
804 | ||
805 | probes[i].name = name; | |
adfe4f5e | 806 | probes[i].load_policy = kern_modules_probes_default[i].load_policy; |
c9d42407 PP |
807 | } |
808 | } | |
809 | ||
810 | /* | |
811 | * Extra modules? Append them to current probes list. | |
812 | */ | |
412d7227 | 813 | list = the_config.kmod_extra_probes_list.value; |
c9d42407 PP |
814 | if (list) { |
815 | ret = append_list_to_probes(list); | |
816 | if (ret) { | |
398d5459 | 817 | goto error; |
c9d42407 PP |
818 | } |
819 | } | |
820 | ||
821 | /* | |
822 | * Load probes modules now. | |
823 | */ | |
adfe4f5e | 824 | ret = modprobe_lttng(probes, nr_probes); |
398d5459 MD |
825 | if (ret) { |
826 | goto error; | |
827 | } | |
828 | return ret; | |
829 | ||
830 | error: | |
831 | free_probes(); | |
832 | return ret; | |
096102bd | 833 | } |