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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
886d51a3 MD |
3 | * lttng-statedump.c |
4 | * | |
c337ddc2 MD |
5 | * Linux Trace Toolkit Next Generation Kernel State Dump |
6 | * | |
7 | * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca> | |
8 | * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
9 | * | |
10 | * Changes: | |
11 | * Eric Clement: Add listing of network IP interface | |
12 | * 2006, 2007 Mathieu Desnoyers Fix kernel threads | |
13 | * Various updates | |
c337ddc2 MD |
14 | */ |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/netlink.h> | |
19 | #include <linux/inet.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/kthread.h> | |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/file.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/irqnr.h> | |
26 | #include <linux/cpu.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/inetdevice.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/mm.h> | |
c337ddc2 MD |
31 | #include <linux/swap.h> |
32 | #include <linux/wait.h> | |
33 | #include <linux/mutex.h> | |
f0dbdefb | 34 | #include <linux/device.h> |
997eff5e | 35 | #include <linux/fdtable.h> |
88eb3d8e | 36 | #include <linux/irq.h> |
c337ddc2 | 37 | |
241ae9a8 MD |
38 | #include <lttng-events.h> |
39 | #include <lttng-tracer.h> | |
1965e6b4 | 40 | #include <wrapper/namespace.h> |
241ae9a8 | 41 | #include <wrapper/genhd.h> |
c337ddc2 | 42 | |
c337ddc2 MD |
43 | /* Define the tracepoints, but do not build the probes */ |
44 | #define CREATE_TRACE_POINTS | |
241ae9a8 | 45 | #define TRACE_INCLUDE_PATH instrumentation/events/lttng-module |
c337ddc2 | 46 | #define TRACE_INCLUDE_FILE lttng-statedump |
3bc29f0a | 47 | #define LTTNG_INSTRUMENTATION |
241ae9a8 | 48 | #include <instrumentation/events/lttng-module/lttng-statedump.h> |
c337ddc2 | 49 | |
f0dbdefb | 50 | DEFINE_TRACE(lttng_statedump_block_device); |
20591cf7 MD |
51 | DEFINE_TRACE(lttng_statedump_end); |
52 | DEFINE_TRACE(lttng_statedump_interrupt); | |
53 | DEFINE_TRACE(lttng_statedump_file_descriptor); | |
54 | DEFINE_TRACE(lttng_statedump_start); | |
55 | DEFINE_TRACE(lttng_statedump_process_state); | |
1965e6b4 MJ |
56 | DEFINE_TRACE(lttng_statedump_process_pid_ns); |
57 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) | |
58 | DEFINE_TRACE(lttng_statedump_process_cgroup_ns); | |
59 | #endif | |
60 | DEFINE_TRACE(lttng_statedump_process_ipc_ns); | |
61 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
62 | DEFINE_TRACE(lttng_statedump_process_mnt_ns); | |
63 | #endif | |
64 | DEFINE_TRACE(lttng_statedump_process_net_ns); | |
65 | DEFINE_TRACE(lttng_statedump_process_user_ns); | |
66 | DEFINE_TRACE(lttng_statedump_process_uts_ns); | |
20591cf7 | 67 | DEFINE_TRACE(lttng_statedump_network_interface); |
d0b55e4c | 68 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 JD |
69 | DEFINE_TRACE(lttng_statedump_cpu_topology); |
70 | #endif | |
20591cf7 | 71 | |
361c023a MD |
72 | struct lttng_fd_ctx { |
73 | char *page; | |
74 | struct lttng_session *session; | |
d561ecfb | 75 | struct files_struct *files; |
361c023a MD |
76 | }; |
77 | ||
c337ddc2 MD |
78 | /* |
79 | * Protected by the trace lock. | |
80 | */ | |
81 | static struct delayed_work cpu_work[NR_CPUS]; | |
82 | static DECLARE_WAIT_QUEUE_HEAD(statedump_wq); | |
83 | static atomic_t kernel_threads_to_run; | |
84 | ||
85 | enum lttng_thread_type { | |
86 | LTTNG_USER_THREAD = 0, | |
87 | LTTNG_KERNEL_THREAD = 1, | |
88 | }; | |
89 | ||
90 | enum lttng_execution_mode { | |
91 | LTTNG_USER_MODE = 0, | |
92 | LTTNG_SYSCALL = 1, | |
93 | LTTNG_TRAP = 2, | |
94 | LTTNG_IRQ = 3, | |
95 | LTTNG_SOFTIRQ = 4, | |
96 | LTTNG_MODE_UNKNOWN = 5, | |
97 | }; | |
98 | ||
99 | enum lttng_execution_submode { | |
100 | LTTNG_NONE = 0, | |
101 | LTTNG_UNKNOWN = 1, | |
102 | }; | |
103 | ||
104 | enum lttng_process_status { | |
105 | LTTNG_UNNAMED = 0, | |
106 | LTTNG_WAIT_FORK = 1, | |
107 | LTTNG_WAIT_CPU = 2, | |
108 | LTTNG_EXIT = 3, | |
109 | LTTNG_ZOMBIE = 4, | |
110 | LTTNG_WAIT = 5, | |
111 | LTTNG_RUN = 6, | |
112 | LTTNG_DEAD = 7, | |
113 | }; | |
114 | ||
f0dbdefb HD |
115 | static |
116 | int lttng_enumerate_block_devices(struct lttng_session *session) | |
117 | { | |
118 | struct class *ptr_block_class; | |
119 | struct device_type *ptr_disk_type; | |
120 | struct class_dev_iter iter; | |
121 | struct device *dev; | |
122 | ||
123 | ptr_block_class = wrapper_get_block_class(); | |
124 | if (!ptr_block_class) | |
125 | return -ENOSYS; | |
126 | ptr_disk_type = wrapper_get_disk_type(); | |
127 | if (!ptr_disk_type) { | |
128 | return -ENOSYS; | |
129 | } | |
130 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
131 | while ((dev = class_dev_iter_next(&iter))) { | |
132 | struct disk_part_iter piter; | |
133 | struct gendisk *disk = dev_to_disk(dev); | |
134 | struct hd_struct *part; | |
135 | ||
5a91f3df MD |
136 | /* |
137 | * Don't show empty devices or things that have been | |
138 | * suppressed | |
139 | */ | |
140 | if (get_capacity(disk) == 0 || | |
141 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
142 | continue; | |
143 | ||
f0dbdefb HD |
144 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
145 | while ((part = disk_part_iter_next(&piter))) { | |
146 | char name_buf[BDEVNAME_SIZE]; | |
147 | char *p; | |
148 | ||
149 | p = wrapper_disk_name(disk, part->partno, name_buf); | |
150 | if (!p) { | |
151 | disk_part_iter_exit(&piter); | |
152 | class_dev_iter_exit(&iter); | |
153 | return -ENOSYS; | |
154 | } | |
155 | trace_lttng_statedump_block_device(session, | |
156 | part_devt(part), name_buf); | |
157 | } | |
158 | disk_part_iter_exit(&piter); | |
159 | } | |
160 | class_dev_iter_exit(&iter); | |
161 | return 0; | |
162 | } | |
163 | ||
c337ddc2 | 164 | #ifdef CONFIG_INET |
f0dbdefb | 165 | |
c337ddc2 MD |
166 | static |
167 | void lttng_enumerate_device(struct lttng_session *session, | |
168 | struct net_device *dev) | |
169 | { | |
170 | struct in_device *in_dev; | |
171 | struct in_ifaddr *ifa; | |
172 | ||
173 | if (dev->flags & IFF_UP) { | |
174 | in_dev = in_dev_get(dev); | |
175 | if (in_dev) { | |
176 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
177 | ifa = ifa->ifa_next) { | |
178 | trace_lttng_statedump_network_interface( | |
179 | session, dev, ifa); | |
180 | } | |
181 | in_dev_put(in_dev); | |
182 | } | |
183 | } else { | |
184 | trace_lttng_statedump_network_interface( | |
185 | session, dev, NULL); | |
186 | } | |
187 | } | |
188 | ||
189 | static | |
190 | int lttng_enumerate_network_ip_interface(struct lttng_session *session) | |
191 | { | |
192 | struct net_device *dev; | |
193 | ||
194 | read_lock(&dev_base_lock); | |
195 | for_each_netdev(&init_net, dev) | |
196 | lttng_enumerate_device(session, dev); | |
197 | read_unlock(&dev_base_lock); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | #else /* CONFIG_INET */ | |
202 | static inline | |
203 | int lttng_enumerate_network_ip_interface(struct lttng_session *session) | |
204 | { | |
205 | return 0; | |
206 | } | |
207 | #endif /* CONFIG_INET */ | |
208 | ||
361c023a MD |
209 | static |
210 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
211 | { | |
212 | const struct lttng_fd_ctx *ctx = p; | |
213 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 214 | unsigned int flags = file->f_flags; |
d561ecfb | 215 | struct fdtable *fdt; |
361c023a | 216 | |
29021503 MD |
217 | /* |
218 | * We don't expose kernel internal flags, only userspace-visible | |
219 | * flags. | |
220 | */ | |
221 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
222 | fdt = files_fdtable(ctx->files); |
223 | /* | |
224 | * We need to check here again whether fd is within the fdt | |
225 | * max_fds range, because we might be seeing a different | |
226 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
227 | * protecting the read. In reality, iterate_fd() holds | |
228 | * file_lock, which should ensure the fdt does not change while | |
229 | * the lock is taken, but we are not aware whether this is | |
230 | * guaranteed or not, so play safe. | |
231 | */ | |
997eff5e | 232 | if (fd < fdt->max_fds && close_on_exec(fd, fdt)) |
29021503 | 233 | flags |= O_CLOEXEC; |
361c023a MD |
234 | if (IS_ERR(s)) { |
235 | struct dentry *dentry = file->f_path.dentry; | |
236 | ||
237 | /* Make sure we give at least some info */ | |
238 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
239 | trace_lttng_statedump_file_descriptor(ctx->session, |
240 | ctx->files, fd, dentry->d_name.name, flags, | |
241 | file->f_mode); | |
361c023a MD |
242 | spin_unlock(&dentry->d_lock); |
243 | goto end; | |
244 | } | |
e7a0ca72 MD |
245 | trace_lttng_statedump_file_descriptor(ctx->session, |
246 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
247 | end: |
248 | return 0; | |
249 | } | |
c337ddc2 | 250 | |
e7a0ca72 | 251 | /* Called with task lock held. */ |
c337ddc2 | 252 | static |
e7a0ca72 MD |
253 | void lttng_enumerate_files(struct lttng_session *session, |
254 | struct files_struct *files, | |
255 | char *tmp) | |
c337ddc2 | 256 | { |
e7a0ca72 | 257 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 258 | |
997eff5e | 259 | iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
260 | } |
261 | ||
d0b55e4c | 262 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 JD |
263 | static |
264 | int lttng_enumerate_cpu_topology(struct lttng_session *session) | |
265 | { | |
266 | int cpu; | |
267 | const cpumask_t *cpumask = cpu_possible_mask; | |
268 | ||
269 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
270 | cpu = cpumask_next(cpu, cpumask)) { | |
271 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | #else | |
277 | static | |
278 | int lttng_enumerate_cpu_topology(struct lttng_session *session) | |
279 | { | |
280 | return 0; | |
281 | } | |
282 | #endif | |
283 | ||
0658bdda MD |
284 | #if 0 |
285 | /* | |
286 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
287 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
288 | * iteration, but it is not exported to modules. | |
289 | */ | |
c337ddc2 MD |
290 | static |
291 | void lttng_enumerate_task_vm_maps(struct lttng_session *session, | |
292 | struct task_struct *p) | |
293 | { | |
294 | struct mm_struct *mm; | |
295 | struct vm_area_struct *map; | |
296 | unsigned long ino; | |
297 | ||
298 | /* get_task_mm does a task_lock... */ | |
299 | mm = get_task_mm(p); | |
300 | if (!mm) | |
301 | return; | |
302 | ||
303 | map = mm->mmap; | |
304 | if (map) { | |
305 | down_read(&mm->mmap_sem); | |
306 | while (map) { | |
307 | if (map->vm_file) | |
34522739 | 308 | ino = map->vm_file->f_path.dentry->d_inode->i_ino; |
c337ddc2 MD |
309 | else |
310 | ino = 0; | |
311 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
312 | map = map->vm_next; | |
313 | } | |
314 | up_read(&mm->mmap_sem); | |
315 | } | |
316 | mmput(mm); | |
317 | } | |
318 | ||
319 | static | |
320 | int lttng_enumerate_vm_maps(struct lttng_session *session) | |
321 | { | |
322 | struct task_struct *p; | |
323 | ||
324 | rcu_read_lock(); | |
325 | for_each_process(p) | |
326 | lttng_enumerate_task_vm_maps(session, p); | |
327 | rcu_read_unlock(); | |
328 | return 0; | |
329 | } | |
0658bdda | 330 | #endif |
c337ddc2 | 331 | |
c337ddc2 | 332 | static |
cfcee1c7 | 333 | int lttng_list_interrupts(struct lttng_session *session) |
c337ddc2 MD |
334 | { |
335 | unsigned int irq; | |
336 | unsigned long flags = 0; | |
337 | struct irq_desc *desc; | |
338 | ||
c337ddc2 MD |
339 | /* needs irq_desc */ |
340 | for_each_irq_desc(irq, desc) { | |
341 | struct irqaction *action; | |
342 | const char *irq_chip_name = | |
343 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
344 | ||
345 | local_irq_save(flags); | |
fc94c945 | 346 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
347 | for (action = desc->action; action; action = action->next) { |
348 | trace_lttng_statedump_interrupt(session, | |
349 | irq, irq_chip_name, action); | |
350 | } | |
fc94c945 | 351 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
352 | local_irq_restore(flags); |
353 | } | |
cfcee1c7 | 354 | return 0; |
c337ddc2 | 355 | } |
c337ddc2 | 356 | |
4ba1f53c | 357 | /* |
1965e6b4 MJ |
358 | * Statedump the task's namespaces using the proc filesystem inode number as |
359 | * the unique identifier. The user and pid ns are nested and will be dumped | |
360 | * recursively. | |
361 | * | |
4ba1f53c MD |
362 | * Called with task lock held. |
363 | */ | |
73e8ba37 JD |
364 | static |
365 | void lttng_statedump_process_ns(struct lttng_session *session, | |
366 | struct task_struct *p, | |
367 | enum lttng_thread_type type, | |
368 | enum lttng_execution_mode mode, | |
369 | enum lttng_execution_submode submode, | |
370 | enum lttng_process_status status) | |
371 | { | |
1965e6b4 | 372 | struct nsproxy *proxy; |
73e8ba37 | 373 | struct pid_namespace *pid_ns; |
1965e6b4 | 374 | struct user_namespace *user_ns; |
73e8ba37 | 375 | |
1965e6b4 MJ |
376 | /* |
377 | * The pid and user namespaces are special, they are nested and | |
378 | * accessed with specific functions instead of the nsproxy struct | |
379 | * like the other namespaces. | |
380 | */ | |
887bcdac MJ |
381 | pid_ns = task_active_pid_ns(p); |
382 | do { | |
1965e6b4 | 383 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 384 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 385 | } while (pid_ns); |
1965e6b4 MJ |
386 | |
387 | ||
388 | user_ns = task_cred_xxx(p, user_ns); | |
389 | do { | |
390 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
391 | /* |
392 | * trace_lttng_statedump_process_user_ns() internally | |
393 | * checks whether user_ns is NULL. While this does not | |
394 | * appear to be a possible return value for | |
395 | * task_cred_xxx(), err on the safe side and check | |
396 | * for NULL here as well to be consistent with the | |
397 | * paranoid behavior of | |
398 | * trace_lttng_statedump_process_user_ns(). | |
399 | */ | |
400 | user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL; | |
1965e6b4 MJ |
401 | } while (user_ns); |
402 | ||
403 | /* | |
404 | * Back and forth on locking strategy within Linux upstream for nsproxy. | |
405 | * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3 | |
406 | * "namespaces: Use task_lock and not rcu to protect nsproxy" | |
407 | * for details. | |
408 | */ | |
409 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \ | |
410 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ | |
411 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
412 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
413 | proxy = p->nsproxy; | |
414 | #else | |
415 | rcu_read_lock(); | |
416 | proxy = task_nsproxy(p); | |
417 | #endif | |
418 | if (proxy) { | |
419 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) | |
420 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); | |
421 | #endif | |
422 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
423 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
424 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
425 | #endif | |
426 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
427 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
428 | } | |
429 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \ | |
430 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ | |
431 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
432 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
433 | /* (nothing) */ | |
434 | #else | |
435 | rcu_read_unlock(); | |
436 | #endif | |
73e8ba37 JD |
437 | } |
438 | ||
c337ddc2 MD |
439 | static |
440 | int lttng_enumerate_process_states(struct lttng_session *session) | |
441 | { | |
442 | struct task_struct *g, *p; | |
e7a0ca72 MD |
443 | char *tmp; |
444 | ||
445 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
446 | if (!tmp) | |
447 | return -ENOMEM; | |
c337ddc2 MD |
448 | |
449 | rcu_read_lock(); | |
450 | for_each_process(g) { | |
e7a0ca72 MD |
451 | struct files_struct *prev_files = NULL; |
452 | ||
c337ddc2 MD |
453 | p = g; |
454 | do { | |
455 | enum lttng_execution_mode mode = | |
456 | LTTNG_MODE_UNKNOWN; | |
457 | enum lttng_execution_submode submode = | |
458 | LTTNG_UNKNOWN; | |
459 | enum lttng_process_status status; | |
460 | enum lttng_thread_type type; | |
e7a0ca72 | 461 | struct files_struct *files; |
c337ddc2 MD |
462 | |
463 | task_lock(p); | |
464 | if (p->exit_state == EXIT_ZOMBIE) | |
465 | status = LTTNG_ZOMBIE; | |
466 | else if (p->exit_state == EXIT_DEAD) | |
467 | status = LTTNG_DEAD; | |
468 | else if (p->state == TASK_RUNNING) { | |
469 | /* Is this a forked child that has not run yet? */ | |
470 | if (list_empty(&p->rt.run_list)) | |
471 | status = LTTNG_WAIT_FORK; | |
472 | else | |
473 | /* | |
474 | * All tasks are considered as wait_cpu; | |
475 | * the viewer will sort out if the task | |
476 | * was really running at this time. | |
477 | */ | |
478 | status = LTTNG_WAIT_CPU; | |
479 | } else if (p->state & | |
480 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { | |
481 | /* Task is waiting for something to complete */ | |
482 | status = LTTNG_WAIT; | |
483 | } else | |
484 | status = LTTNG_UNNAMED; | |
485 | submode = LTTNG_NONE; | |
486 | ||
487 | /* | |
488 | * Verification of t->mm is to filter out kernel | |
489 | * threads; Viewer will further filter out if a | |
490 | * user-space thread was in syscall mode or not. | |
491 | */ | |
492 | if (p->mm) | |
493 | type = LTTNG_USER_THREAD; | |
494 | else | |
495 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 496 | files = p->files; |
d2a927ac MJ |
497 | |
498 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 499 | p, type, mode, submode, status, files); |
73e8ba37 | 500 | lttng_statedump_process_ns(session, |
c337ddc2 | 501 | p, type, mode, submode, status); |
e7a0ca72 MD |
502 | /* |
503 | * As an optimisation for the common case, do not | |
504 | * repeat information for the same files_struct in | |
505 | * two consecutive threads. This is the common case | |
506 | * for threads sharing the same fd table. RCU guarantees | |
507 | * that the same files_struct pointer is not re-used | |
508 | * throughout processes/threads iteration. | |
509 | */ | |
510 | if (files && files != prev_files) { | |
511 | lttng_enumerate_files(session, files, tmp); | |
512 | prev_files = files; | |
513 | } | |
c337ddc2 MD |
514 | task_unlock(p); |
515 | } while_each_thread(g, p); | |
516 | } | |
517 | rcu_read_unlock(); | |
518 | ||
e7a0ca72 MD |
519 | free_page((unsigned long) tmp); |
520 | ||
c337ddc2 MD |
521 | return 0; |
522 | } | |
523 | ||
524 | static | |
525 | void lttng_statedump_work_func(struct work_struct *work) | |
526 | { | |
527 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
528 | /* If we are the last thread, wake up do_lttng_statedump */ | |
529 | wake_up(&statedump_wq); | |
530 | } | |
531 | ||
532 | static | |
533 | int do_lttng_statedump(struct lttng_session *session) | |
534 | { | |
cfcee1c7 | 535 | int cpu, ret; |
c337ddc2 | 536 | |
c337ddc2 | 537 | trace_lttng_statedump_start(session); |
cfcee1c7 | 538 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
539 | if (ret) |
540 | return ret; | |
541 | /* | |
542 | * FIXME | |
543 | * ret = lttng_enumerate_vm_maps(session); | |
544 | * if (ret) | |
545 | * return ret; | |
546 | */ | |
547 | ret = lttng_list_interrupts(session); | |
548 | if (ret) | |
549 | return ret; | |
550 | ret = lttng_enumerate_network_ip_interface(session); | |
551 | if (ret) | |
552 | return ret; | |
553 | ret = lttng_enumerate_block_devices(session); | |
554 | switch (ret) { | |
84c7055e MD |
555 | case 0: |
556 | break; | |
cfcee1c7 MD |
557 | case -ENOSYS: |
558 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
559 | break; | |
560 | default: | |
561 | return ret; | |
562 | } | |
502e4132 JD |
563 | ret = lttng_enumerate_cpu_topology(session); |
564 | if (ret) | |
565 | return ret; | |
c337ddc2 MD |
566 | |
567 | /* TODO lttng_dump_idt_table(session); */ | |
568 | /* TODO lttng_dump_softirq_vec(session); */ | |
569 | /* TODO lttng_list_modules(session); */ | |
570 | /* TODO lttng_dump_swap_files(session); */ | |
571 | ||
572 | /* | |
573 | * Fire off a work queue on each CPU. Their sole purpose in life | |
574 | * is to guarantee that each CPU has been in a state where is was in | |
575 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
576 | */ | |
577 | get_online_cpus(); | |
578 | atomic_set(&kernel_threads_to_run, num_online_cpus()); | |
579 | for_each_online_cpu(cpu) { | |
580 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
581 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
582 | } | |
583 | /* Wait for all threads to run */ | |
7a7128e0 | 584 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
c337ddc2 MD |
585 | put_online_cpus(); |
586 | /* Our work is done */ | |
c337ddc2 MD |
587 | trace_lttng_statedump_end(session); |
588 | return 0; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Called with session mutex held. | |
593 | */ | |
594 | int lttng_statedump_start(struct lttng_session *session) | |
595 | { | |
c337ddc2 MD |
596 | return do_lttng_statedump(session); |
597 | } | |
598 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
599 | ||
dd8d5afb MD |
600 | static |
601 | int __init lttng_statedump_init(void) | |
602 | { | |
d16aa9c9 | 603 | return 0; |
dd8d5afb MD |
604 | } |
605 | ||
606 | module_init(lttng_statedump_init); | |
607 | ||
461277e7 MD |
608 | static |
609 | void __exit lttng_statedump_exit(void) | |
610 | { | |
611 | } | |
612 | ||
613 | module_exit(lttng_statedump_exit); | |
614 | ||
c337ddc2 MD |
615 | MODULE_LICENSE("GPL and additional rights"); |
616 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 617 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
618 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
619 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
620 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
621 | LTTNG_MODULES_EXTRAVERSION); |