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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> |
c337ddc2 | 36 | |
241ae9a8 MD |
37 | #include <lttng-events.h> |
38 | #include <lttng-tracer.h> | |
1965e6b4 | 39 | #include <wrapper/namespace.h> |
241ae9a8 | 40 | #include <wrapper/irq.h> |
241ae9a8 MD |
41 | #include <wrapper/genhd.h> |
42 | #include <wrapper/file.h> | |
c337ddc2 | 43 | |
29784493 | 44 | #ifdef CONFIG_LTTNG_HAS_LIST_IRQ |
c337ddc2 MD |
45 | #include <linux/irq.h> |
46 | #endif | |
47 | ||
48 | /* Define the tracepoints, but do not build the probes */ | |
49 | #define CREATE_TRACE_POINTS | |
241ae9a8 | 50 | #define TRACE_INCLUDE_PATH instrumentation/events/lttng-module |
c337ddc2 | 51 | #define TRACE_INCLUDE_FILE lttng-statedump |
3bc29f0a | 52 | #define LTTNG_INSTRUMENTATION |
241ae9a8 | 53 | #include <instrumentation/events/lttng-module/lttng-statedump.h> |
c337ddc2 | 54 | |
f0dbdefb | 55 | DEFINE_TRACE(lttng_statedump_block_device); |
20591cf7 MD |
56 | DEFINE_TRACE(lttng_statedump_end); |
57 | DEFINE_TRACE(lttng_statedump_interrupt); | |
58 | DEFINE_TRACE(lttng_statedump_file_descriptor); | |
59 | DEFINE_TRACE(lttng_statedump_start); | |
60 | DEFINE_TRACE(lttng_statedump_process_state); | |
1965e6b4 MJ |
61 | DEFINE_TRACE(lttng_statedump_process_pid_ns); |
62 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) | |
63 | DEFINE_TRACE(lttng_statedump_process_cgroup_ns); | |
64 | #endif | |
65 | DEFINE_TRACE(lttng_statedump_process_ipc_ns); | |
66 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
67 | DEFINE_TRACE(lttng_statedump_process_mnt_ns); | |
68 | #endif | |
69 | DEFINE_TRACE(lttng_statedump_process_net_ns); | |
70 | DEFINE_TRACE(lttng_statedump_process_user_ns); | |
71 | DEFINE_TRACE(lttng_statedump_process_uts_ns); | |
20591cf7 | 72 | DEFINE_TRACE(lttng_statedump_network_interface); |
d0b55e4c | 73 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 JD |
74 | DEFINE_TRACE(lttng_statedump_cpu_topology); |
75 | #endif | |
20591cf7 | 76 | |
361c023a MD |
77 | struct lttng_fd_ctx { |
78 | char *page; | |
79 | struct lttng_session *session; | |
d561ecfb | 80 | struct files_struct *files; |
361c023a MD |
81 | }; |
82 | ||
c337ddc2 MD |
83 | /* |
84 | * Protected by the trace lock. | |
85 | */ | |
86 | static struct delayed_work cpu_work[NR_CPUS]; | |
87 | static DECLARE_WAIT_QUEUE_HEAD(statedump_wq); | |
88 | static atomic_t kernel_threads_to_run; | |
89 | ||
90 | enum lttng_thread_type { | |
91 | LTTNG_USER_THREAD = 0, | |
92 | LTTNG_KERNEL_THREAD = 1, | |
93 | }; | |
94 | ||
95 | enum lttng_execution_mode { | |
96 | LTTNG_USER_MODE = 0, | |
97 | LTTNG_SYSCALL = 1, | |
98 | LTTNG_TRAP = 2, | |
99 | LTTNG_IRQ = 3, | |
100 | LTTNG_SOFTIRQ = 4, | |
101 | LTTNG_MODE_UNKNOWN = 5, | |
102 | }; | |
103 | ||
104 | enum lttng_execution_submode { | |
105 | LTTNG_NONE = 0, | |
106 | LTTNG_UNKNOWN = 1, | |
107 | }; | |
108 | ||
109 | enum lttng_process_status { | |
110 | LTTNG_UNNAMED = 0, | |
111 | LTTNG_WAIT_FORK = 1, | |
112 | LTTNG_WAIT_CPU = 2, | |
113 | LTTNG_EXIT = 3, | |
114 | LTTNG_ZOMBIE = 4, | |
115 | LTTNG_WAIT = 5, | |
116 | LTTNG_RUN = 6, | |
117 | LTTNG_DEAD = 7, | |
118 | }; | |
119 | ||
f0dbdefb HD |
120 | static |
121 | int lttng_enumerate_block_devices(struct lttng_session *session) | |
122 | { | |
123 | struct class *ptr_block_class; | |
124 | struct device_type *ptr_disk_type; | |
125 | struct class_dev_iter iter; | |
126 | struct device *dev; | |
127 | ||
128 | ptr_block_class = wrapper_get_block_class(); | |
129 | if (!ptr_block_class) | |
130 | return -ENOSYS; | |
131 | ptr_disk_type = wrapper_get_disk_type(); | |
132 | if (!ptr_disk_type) { | |
133 | return -ENOSYS; | |
134 | } | |
135 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
136 | while ((dev = class_dev_iter_next(&iter))) { | |
137 | struct disk_part_iter piter; | |
138 | struct gendisk *disk = dev_to_disk(dev); | |
139 | struct hd_struct *part; | |
140 | ||
5a91f3df MD |
141 | /* |
142 | * Don't show empty devices or things that have been | |
143 | * suppressed | |
144 | */ | |
145 | if (get_capacity(disk) == 0 || | |
146 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) | |
147 | continue; | |
148 | ||
f0dbdefb HD |
149 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
150 | while ((part = disk_part_iter_next(&piter))) { | |
151 | char name_buf[BDEVNAME_SIZE]; | |
152 | char *p; | |
153 | ||
154 | p = wrapper_disk_name(disk, part->partno, name_buf); | |
155 | if (!p) { | |
156 | disk_part_iter_exit(&piter); | |
157 | class_dev_iter_exit(&iter); | |
158 | return -ENOSYS; | |
159 | } | |
160 | trace_lttng_statedump_block_device(session, | |
161 | part_devt(part), name_buf); | |
162 | } | |
163 | disk_part_iter_exit(&piter); | |
164 | } | |
165 | class_dev_iter_exit(&iter); | |
166 | return 0; | |
167 | } | |
168 | ||
c337ddc2 | 169 | #ifdef CONFIG_INET |
f0dbdefb | 170 | |
c337ddc2 MD |
171 | static |
172 | void lttng_enumerate_device(struct lttng_session *session, | |
173 | struct net_device *dev) | |
174 | { | |
175 | struct in_device *in_dev; | |
176 | struct in_ifaddr *ifa; | |
177 | ||
178 | if (dev->flags & IFF_UP) { | |
179 | in_dev = in_dev_get(dev); | |
180 | if (in_dev) { | |
181 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
182 | ifa = ifa->ifa_next) { | |
183 | trace_lttng_statedump_network_interface( | |
184 | session, dev, ifa); | |
185 | } | |
186 | in_dev_put(in_dev); | |
187 | } | |
188 | } else { | |
189 | trace_lttng_statedump_network_interface( | |
190 | session, dev, NULL); | |
191 | } | |
192 | } | |
193 | ||
194 | static | |
195 | int lttng_enumerate_network_ip_interface(struct lttng_session *session) | |
196 | { | |
197 | struct net_device *dev; | |
198 | ||
199 | read_lock(&dev_base_lock); | |
200 | for_each_netdev(&init_net, dev) | |
201 | lttng_enumerate_device(session, dev); | |
202 | read_unlock(&dev_base_lock); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | #else /* CONFIG_INET */ | |
207 | static inline | |
208 | int lttng_enumerate_network_ip_interface(struct lttng_session *session) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | #endif /* CONFIG_INET */ | |
213 | ||
361c023a MD |
214 | static |
215 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
216 | { | |
217 | const struct lttng_fd_ctx *ctx = p; | |
218 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 219 | unsigned int flags = file->f_flags; |
d561ecfb | 220 | struct fdtable *fdt; |
361c023a | 221 | |
29021503 MD |
222 | /* |
223 | * We don't expose kernel internal flags, only userspace-visible | |
224 | * flags. | |
225 | */ | |
226 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
227 | fdt = files_fdtable(ctx->files); |
228 | /* | |
229 | * We need to check here again whether fd is within the fdt | |
230 | * max_fds range, because we might be seeing a different | |
231 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
232 | * protecting the read. In reality, iterate_fd() holds | |
233 | * file_lock, which should ensure the fdt does not change while | |
234 | * the lock is taken, but we are not aware whether this is | |
235 | * guaranteed or not, so play safe. | |
236 | */ | |
997eff5e | 237 | if (fd < fdt->max_fds && close_on_exec(fd, fdt)) |
29021503 | 238 | flags |= O_CLOEXEC; |
361c023a MD |
239 | if (IS_ERR(s)) { |
240 | struct dentry *dentry = file->f_path.dentry; | |
241 | ||
242 | /* Make sure we give at least some info */ | |
243 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
244 | trace_lttng_statedump_file_descriptor(ctx->session, |
245 | ctx->files, fd, dentry->d_name.name, flags, | |
246 | file->f_mode); | |
361c023a MD |
247 | spin_unlock(&dentry->d_lock); |
248 | goto end; | |
249 | } | |
e7a0ca72 MD |
250 | trace_lttng_statedump_file_descriptor(ctx->session, |
251 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
252 | end: |
253 | return 0; | |
254 | } | |
c337ddc2 | 255 | |
e7a0ca72 | 256 | /* Called with task lock held. */ |
c337ddc2 | 257 | static |
e7a0ca72 MD |
258 | void lttng_enumerate_files(struct lttng_session *session, |
259 | struct files_struct *files, | |
260 | char *tmp) | |
c337ddc2 | 261 | { |
e7a0ca72 | 262 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 263 | |
997eff5e | 264 | iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
265 | } |
266 | ||
d0b55e4c | 267 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 JD |
268 | static |
269 | int lttng_enumerate_cpu_topology(struct lttng_session *session) | |
270 | { | |
271 | int cpu; | |
272 | const cpumask_t *cpumask = cpu_possible_mask; | |
273 | ||
274 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
275 | cpu = cpumask_next(cpu, cpumask)) { | |
276 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
277 | } | |
278 | ||
279 | return 0; | |
280 | } | |
281 | #else | |
282 | static | |
283 | int lttng_enumerate_cpu_topology(struct lttng_session *session) | |
284 | { | |
285 | return 0; | |
286 | } | |
287 | #endif | |
288 | ||
0658bdda MD |
289 | #if 0 |
290 | /* | |
291 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
292 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
293 | * iteration, but it is not exported to modules. | |
294 | */ | |
c337ddc2 MD |
295 | static |
296 | void lttng_enumerate_task_vm_maps(struct lttng_session *session, | |
297 | struct task_struct *p) | |
298 | { | |
299 | struct mm_struct *mm; | |
300 | struct vm_area_struct *map; | |
301 | unsigned long ino; | |
302 | ||
303 | /* get_task_mm does a task_lock... */ | |
304 | mm = get_task_mm(p); | |
305 | if (!mm) | |
306 | return; | |
307 | ||
308 | map = mm->mmap; | |
309 | if (map) { | |
310 | down_read(&mm->mmap_sem); | |
311 | while (map) { | |
312 | if (map->vm_file) | |
b06ed645 | 313 | ino = map->vm_file->lttng_f_dentry->d_inode->i_ino; |
c337ddc2 MD |
314 | else |
315 | ino = 0; | |
316 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
317 | map = map->vm_next; | |
318 | } | |
319 | up_read(&mm->mmap_sem); | |
320 | } | |
321 | mmput(mm); | |
322 | } | |
323 | ||
324 | static | |
325 | int lttng_enumerate_vm_maps(struct lttng_session *session) | |
326 | { | |
327 | struct task_struct *p; | |
328 | ||
329 | rcu_read_lock(); | |
330 | for_each_process(p) | |
331 | lttng_enumerate_task_vm_maps(session, p); | |
332 | rcu_read_unlock(); | |
333 | return 0; | |
334 | } | |
0658bdda | 335 | #endif |
c337ddc2 | 336 | |
29784493 | 337 | #ifdef CONFIG_LTTNG_HAS_LIST_IRQ |
47faec4b | 338 | |
c337ddc2 | 339 | static |
cfcee1c7 | 340 | int lttng_list_interrupts(struct lttng_session *session) |
c337ddc2 MD |
341 | { |
342 | unsigned int irq; | |
343 | unsigned long flags = 0; | |
344 | struct irq_desc *desc; | |
345 | ||
c337ddc2 MD |
346 | /* needs irq_desc */ |
347 | for_each_irq_desc(irq, desc) { | |
348 | struct irqaction *action; | |
349 | const char *irq_chip_name = | |
350 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
351 | ||
352 | local_irq_save(flags); | |
fc94c945 | 353 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
354 | for (action = desc->action; action; action = action->next) { |
355 | trace_lttng_statedump_interrupt(session, | |
356 | irq, irq_chip_name, action); | |
357 | } | |
fc94c945 | 358 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
359 | local_irq_restore(flags); |
360 | } | |
cfcee1c7 | 361 | return 0; |
c337ddc2 MD |
362 | } |
363 | #else | |
364 | static inline | |
cfcee1c7 | 365 | int lttng_list_interrupts(struct lttng_session *session) |
c337ddc2 | 366 | { |
cfcee1c7 | 367 | return 0; |
c337ddc2 MD |
368 | } |
369 | #endif | |
370 | ||
4ba1f53c | 371 | /* |
1965e6b4 MJ |
372 | * Statedump the task's namespaces using the proc filesystem inode number as |
373 | * the unique identifier. The user and pid ns are nested and will be dumped | |
374 | * recursively. | |
375 | * | |
4ba1f53c MD |
376 | * Called with task lock held. |
377 | */ | |
73e8ba37 JD |
378 | static |
379 | void lttng_statedump_process_ns(struct lttng_session *session, | |
380 | struct task_struct *p, | |
381 | enum lttng_thread_type type, | |
382 | enum lttng_execution_mode mode, | |
383 | enum lttng_execution_submode submode, | |
384 | enum lttng_process_status status) | |
385 | { | |
1965e6b4 | 386 | struct nsproxy *proxy; |
73e8ba37 | 387 | struct pid_namespace *pid_ns; |
1965e6b4 | 388 | struct user_namespace *user_ns; |
73e8ba37 | 389 | |
1965e6b4 MJ |
390 | /* |
391 | * The pid and user namespaces are special, they are nested and | |
392 | * accessed with specific functions instead of the nsproxy struct | |
393 | * like the other namespaces. | |
394 | */ | |
887bcdac MJ |
395 | pid_ns = task_active_pid_ns(p); |
396 | do { | |
1965e6b4 | 397 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 398 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 399 | } while (pid_ns); |
1965e6b4 MJ |
400 | |
401 | ||
402 | user_ns = task_cred_xxx(p, user_ns); | |
403 | do { | |
404 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
405 | /* |
406 | * trace_lttng_statedump_process_user_ns() internally | |
407 | * checks whether user_ns is NULL. While this does not | |
408 | * appear to be a possible return value for | |
409 | * task_cred_xxx(), err on the safe side and check | |
410 | * for NULL here as well to be consistent with the | |
411 | * paranoid behavior of | |
412 | * trace_lttng_statedump_process_user_ns(). | |
413 | */ | |
414 | user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL; | |
1965e6b4 MJ |
415 | } while (user_ns); |
416 | ||
417 | /* | |
418 | * Back and forth on locking strategy within Linux upstream for nsproxy. | |
419 | * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3 | |
420 | * "namespaces: Use task_lock and not rcu to protect nsproxy" | |
421 | * for details. | |
422 | */ | |
423 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \ | |
424 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ | |
425 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
426 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
427 | proxy = p->nsproxy; | |
428 | #else | |
429 | rcu_read_lock(); | |
430 | proxy = task_nsproxy(p); | |
431 | #endif | |
432 | if (proxy) { | |
433 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)) | |
434 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); | |
435 | #endif | |
436 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
437 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
438 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
439 | #endif | |
440 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
441 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
442 | } | |
443 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \ | |
444 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ | |
445 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
446 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
447 | /* (nothing) */ | |
448 | #else | |
449 | rcu_read_unlock(); | |
450 | #endif | |
73e8ba37 JD |
451 | } |
452 | ||
c337ddc2 MD |
453 | static |
454 | int lttng_enumerate_process_states(struct lttng_session *session) | |
455 | { | |
456 | struct task_struct *g, *p; | |
e7a0ca72 MD |
457 | char *tmp; |
458 | ||
459 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
460 | if (!tmp) | |
461 | return -ENOMEM; | |
c337ddc2 MD |
462 | |
463 | rcu_read_lock(); | |
464 | for_each_process(g) { | |
e7a0ca72 MD |
465 | struct files_struct *prev_files = NULL; |
466 | ||
c337ddc2 MD |
467 | p = g; |
468 | do { | |
469 | enum lttng_execution_mode mode = | |
470 | LTTNG_MODE_UNKNOWN; | |
471 | enum lttng_execution_submode submode = | |
472 | LTTNG_UNKNOWN; | |
473 | enum lttng_process_status status; | |
474 | enum lttng_thread_type type; | |
e7a0ca72 | 475 | struct files_struct *files; |
c337ddc2 MD |
476 | |
477 | task_lock(p); | |
478 | if (p->exit_state == EXIT_ZOMBIE) | |
479 | status = LTTNG_ZOMBIE; | |
480 | else if (p->exit_state == EXIT_DEAD) | |
481 | status = LTTNG_DEAD; | |
482 | else if (p->state == TASK_RUNNING) { | |
483 | /* Is this a forked child that has not run yet? */ | |
484 | if (list_empty(&p->rt.run_list)) | |
485 | status = LTTNG_WAIT_FORK; | |
486 | else | |
487 | /* | |
488 | * All tasks are considered as wait_cpu; | |
489 | * the viewer will sort out if the task | |
490 | * was really running at this time. | |
491 | */ | |
492 | status = LTTNG_WAIT_CPU; | |
493 | } else if (p->state & | |
494 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { | |
495 | /* Task is waiting for something to complete */ | |
496 | status = LTTNG_WAIT; | |
497 | } else | |
498 | status = LTTNG_UNNAMED; | |
499 | submode = LTTNG_NONE; | |
500 | ||
501 | /* | |
502 | * Verification of t->mm is to filter out kernel | |
503 | * threads; Viewer will further filter out if a | |
504 | * user-space thread was in syscall mode or not. | |
505 | */ | |
506 | if (p->mm) | |
507 | type = LTTNG_USER_THREAD; | |
508 | else | |
509 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 510 | files = p->files; |
d2a927ac MJ |
511 | |
512 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 513 | p, type, mode, submode, status, files); |
73e8ba37 | 514 | lttng_statedump_process_ns(session, |
c337ddc2 | 515 | p, type, mode, submode, status); |
e7a0ca72 MD |
516 | /* |
517 | * As an optimisation for the common case, do not | |
518 | * repeat information for the same files_struct in | |
519 | * two consecutive threads. This is the common case | |
520 | * for threads sharing the same fd table. RCU guarantees | |
521 | * that the same files_struct pointer is not re-used | |
522 | * throughout processes/threads iteration. | |
523 | */ | |
524 | if (files && files != prev_files) { | |
525 | lttng_enumerate_files(session, files, tmp); | |
526 | prev_files = files; | |
527 | } | |
c337ddc2 MD |
528 | task_unlock(p); |
529 | } while_each_thread(g, p); | |
530 | } | |
531 | rcu_read_unlock(); | |
532 | ||
e7a0ca72 MD |
533 | free_page((unsigned long) tmp); |
534 | ||
c337ddc2 MD |
535 | return 0; |
536 | } | |
537 | ||
538 | static | |
539 | void lttng_statedump_work_func(struct work_struct *work) | |
540 | { | |
541 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
542 | /* If we are the last thread, wake up do_lttng_statedump */ | |
543 | wake_up(&statedump_wq); | |
544 | } | |
545 | ||
546 | static | |
547 | int do_lttng_statedump(struct lttng_session *session) | |
548 | { | |
cfcee1c7 | 549 | int cpu, ret; |
c337ddc2 | 550 | |
c337ddc2 | 551 | trace_lttng_statedump_start(session); |
cfcee1c7 | 552 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
553 | if (ret) |
554 | return ret; | |
555 | /* | |
556 | * FIXME | |
557 | * ret = lttng_enumerate_vm_maps(session); | |
558 | * if (ret) | |
559 | * return ret; | |
560 | */ | |
561 | ret = lttng_list_interrupts(session); | |
562 | if (ret) | |
563 | return ret; | |
564 | ret = lttng_enumerate_network_ip_interface(session); | |
565 | if (ret) | |
566 | return ret; | |
567 | ret = lttng_enumerate_block_devices(session); | |
568 | switch (ret) { | |
84c7055e MD |
569 | case 0: |
570 | break; | |
cfcee1c7 MD |
571 | case -ENOSYS: |
572 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
573 | break; | |
574 | default: | |
575 | return ret; | |
576 | } | |
502e4132 JD |
577 | ret = lttng_enumerate_cpu_topology(session); |
578 | if (ret) | |
579 | return ret; | |
c337ddc2 MD |
580 | |
581 | /* TODO lttng_dump_idt_table(session); */ | |
582 | /* TODO lttng_dump_softirq_vec(session); */ | |
583 | /* TODO lttng_list_modules(session); */ | |
584 | /* TODO lttng_dump_swap_files(session); */ | |
585 | ||
586 | /* | |
587 | * Fire off a work queue on each CPU. Their sole purpose in life | |
588 | * is to guarantee that each CPU has been in a state where is was in | |
589 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
590 | */ | |
591 | get_online_cpus(); | |
592 | atomic_set(&kernel_threads_to_run, num_online_cpus()); | |
593 | for_each_online_cpu(cpu) { | |
594 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
595 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
596 | } | |
597 | /* Wait for all threads to run */ | |
7a7128e0 | 598 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
c337ddc2 MD |
599 | put_online_cpus(); |
600 | /* Our work is done */ | |
c337ddc2 MD |
601 | trace_lttng_statedump_end(session); |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Called with session mutex held. | |
607 | */ | |
608 | int lttng_statedump_start(struct lttng_session *session) | |
609 | { | |
c337ddc2 MD |
610 | return do_lttng_statedump(session); |
611 | } | |
612 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
613 | ||
dd8d5afb MD |
614 | static |
615 | int __init lttng_statedump_init(void) | |
616 | { | |
d16aa9c9 | 617 | return 0; |
dd8d5afb MD |
618 | } |
619 | ||
620 | module_init(lttng_statedump_init); | |
621 | ||
461277e7 MD |
622 | static |
623 | void __exit lttng_statedump_exit(void) | |
624 | { | |
625 | } | |
626 | ||
627 | module_exit(lttng_statedump_exit); | |
628 | ||
c337ddc2 MD |
629 | MODULE_LICENSE("GPL and additional rights"); |
630 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 631 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
632 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
633 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
634 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
635 | LTTNG_MODULES_EXTRAVERSION); |