Commit | Line | Data |
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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> | |
74019c61 | 25 | #include <linux/irq.h> |
c337ddc2 | 26 | #include <linux/irqnr.h> |
c337ddc2 MD |
27 | #include <linux/netdevice.h> |
28 | #include <linux/inetdevice.h> | |
c337ddc2 | 29 | #include <linux/mm.h> |
c337ddc2 MD |
30 | #include <linux/swap.h> |
31 | #include <linux/wait.h> | |
32 | #include <linux/mutex.h> | |
f0dbdefb | 33 | #include <linux/device.h> |
c337ddc2 | 34 | |
5677d2e5 MJ |
35 | #include <linux/blkdev.h> |
36 | ||
2df37e95 MD |
37 | #include <lttng/events.h> |
38 | #include <lttng/tracer.h> | |
ffcc8734 | 39 | #include <wrapper/cpu.h> |
241ae9a8 | 40 | #include <wrapper/irqdesc.h> |
241ae9a8 | 41 | #include <wrapper/fdtable.h> |
241ae9a8 | 42 | #include <wrapper/tracepoint.h> |
82fbf9d3 | 43 | #include <wrapper/blkdev.h> |
c07dca48 | 44 | #include <wrapper/fdtable.h> |
7259e6a5 | 45 | #include <wrapper/sched.h> |
c337ddc2 | 46 | |
c337ddc2 MD |
47 | /* Define the tracepoints, but do not build the probes */ |
48 | #define CREATE_TRACE_POINTS | |
4f47ccf0 | 49 | #define TRACE_INCLUDE_PATH instrumentation/events |
c337ddc2 | 50 | #define TRACE_INCLUDE_FILE lttng-statedump |
3bc29f0a | 51 | #define LTTNG_INSTRUMENTATION |
4f47ccf0 | 52 | #include <instrumentation/events/lttng-statedump.h> |
c337ddc2 | 53 | |
0116245f | 54 | LTTNG_DEFINE_TRACE(lttng_statedump_block_device, |
8cdc1a81 | 55 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
56 | dev_t dev, const char *diskname), |
57 | TP_ARGS(session, dev, diskname)); | |
58 | ||
59 | LTTNG_DEFINE_TRACE(lttng_statedump_end, | |
8cdc1a81 | 60 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
61 | TP_ARGS(session)); |
62 | ||
63 | LTTNG_DEFINE_TRACE(lttng_statedump_interrupt, | |
8cdc1a81 | 64 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
65 | unsigned int irq, const char *chip_name, |
66 | struct irqaction *action), | |
67 | TP_ARGS(session, irq, chip_name, action)); | |
68 | ||
69 | LTTNG_DEFINE_TRACE(lttng_statedump_file_descriptor, | |
8cdc1a81 | 70 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
71 | struct files_struct *files, |
72 | int fd, const char *filename, | |
73 | unsigned int flags, fmode_t fmode), | |
74 | TP_ARGS(session, files, fd, filename, flags, fmode)); | |
75 | ||
76 | LTTNG_DEFINE_TRACE(lttng_statedump_start, | |
8cdc1a81 | 77 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
78 | TP_ARGS(session)); |
79 | ||
80 | LTTNG_DEFINE_TRACE(lttng_statedump_process_state, | |
8cdc1a81 | 81 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
82 | struct task_struct *p, |
83 | int type, int mode, int submode, int status, | |
84 | struct files_struct *files), | |
85 | TP_ARGS(session, p, type, mode, submode, status, files)); | |
86 | ||
87 | LTTNG_DEFINE_TRACE(lttng_statedump_process_pid_ns, | |
8cdc1a81 | 88 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
89 | struct task_struct *p, |
90 | struct pid_namespace *pid_ns), | |
91 | TP_ARGS(session, p, pid_ns)); | |
92 | ||
5f4c791e | 93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
0116245f | 94 | LTTNG_DEFINE_TRACE(lttng_statedump_process_cgroup_ns, |
8cdc1a81 | 95 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
96 | struct task_struct *p, |
97 | struct cgroup_namespace *cgroup_ns), | |
98 | TP_ARGS(session, p, cgroup_ns)); | |
1965e6b4 | 99 | #endif |
0116245f MJ |
100 | |
101 | LTTNG_DEFINE_TRACE(lttng_statedump_process_ipc_ns, | |
8cdc1a81 | 102 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
103 | struct task_struct *p, |
104 | struct ipc_namespace *ipc_ns), | |
105 | TP_ARGS(session, p, ipc_ns)); | |
106 | ||
1965e6b4 | 107 | #ifndef LTTNG_MNT_NS_MISSING_HEADER |
0116245f | 108 | LTTNG_DEFINE_TRACE(lttng_statedump_process_mnt_ns, |
8cdc1a81 | 109 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
110 | struct task_struct *p, |
111 | struct mnt_namespace *mnt_ns), | |
112 | TP_ARGS(session, p, mnt_ns)); | |
1965e6b4 | 113 | #endif |
0116245f MJ |
114 | |
115 | LTTNG_DEFINE_TRACE(lttng_statedump_process_net_ns, | |
8cdc1a81 | 116 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
117 | struct task_struct *p, |
118 | struct net *net_ns), | |
119 | TP_ARGS(session, p, net_ns)); | |
120 | ||
121 | LTTNG_DEFINE_TRACE(lttng_statedump_process_user_ns, | |
8cdc1a81 | 122 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
123 | struct task_struct *p, |
124 | struct user_namespace *user_ns), | |
125 | TP_ARGS(session, p, user_ns)); | |
126 | ||
127 | LTTNG_DEFINE_TRACE(lttng_statedump_process_uts_ns, | |
8cdc1a81 | 128 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
129 | struct task_struct *p, |
130 | struct uts_namespace *uts_ns), | |
131 | TP_ARGS(session, p, uts_ns)); | |
132 | ||
133 | LTTNG_DEFINE_TRACE(lttng_statedump_process_time_ns, | |
8cdc1a81 | 134 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
135 | struct task_struct *p, |
136 | struct time_namespace *time_ns), | |
137 | TP_ARGS(session, p, time_ns)); | |
138 | ||
139 | LTTNG_DEFINE_TRACE(lttng_statedump_network_interface, | |
8cdc1a81 | 140 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
141 | struct net_device *dev, struct in_ifaddr *ifa), |
142 | TP_ARGS(session, dev, ifa)); | |
143 | ||
d0b55e4c | 144 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
0116245f | 145 | LTTNG_DEFINE_TRACE(lttng_statedump_cpu_topology, |
8cdc1a81 | 146 | TP_PROTO(struct lttng_kernel_session *session, struct cpuinfo_x86 *c), |
0116245f | 147 | TP_ARGS(session, c)); |
502e4132 | 148 | #endif |
20591cf7 | 149 | |
361c023a MD |
150 | struct lttng_fd_ctx { |
151 | char *page; | |
8cdc1a81 | 152 | struct lttng_kernel_session *session; |
d561ecfb | 153 | struct files_struct *files; |
361c023a MD |
154 | }; |
155 | ||
c337ddc2 MD |
156 | /* |
157 | * Protected by the trace lock. | |
158 | */ | |
159 | static struct delayed_work cpu_work[NR_CPUS]; | |
160 | static DECLARE_WAIT_QUEUE_HEAD(statedump_wq); | |
161 | static atomic_t kernel_threads_to_run; | |
162 | ||
163 | enum lttng_thread_type { | |
164 | LTTNG_USER_THREAD = 0, | |
165 | LTTNG_KERNEL_THREAD = 1, | |
166 | }; | |
167 | ||
168 | enum lttng_execution_mode { | |
169 | LTTNG_USER_MODE = 0, | |
170 | LTTNG_SYSCALL = 1, | |
171 | LTTNG_TRAP = 2, | |
172 | LTTNG_IRQ = 3, | |
173 | LTTNG_SOFTIRQ = 4, | |
174 | LTTNG_MODE_UNKNOWN = 5, | |
175 | }; | |
176 | ||
177 | enum lttng_execution_submode { | |
178 | LTTNG_NONE = 0, | |
179 | LTTNG_UNKNOWN = 1, | |
180 | }; | |
181 | ||
182 | enum lttng_process_status { | |
183 | LTTNG_UNNAMED = 0, | |
184 | LTTNG_WAIT_FORK = 1, | |
185 | LTTNG_WAIT_CPU = 2, | |
186 | LTTNG_EXIT = 3, | |
187 | LTTNG_ZOMBIE = 4, | |
188 | LTTNG_WAIT = 5, | |
189 | LTTNG_RUN = 6, | |
190 | LTTNG_DEAD = 7, | |
191 | }; | |
192 | ||
fef7fe6a | 193 | |
cc92a211 MJ |
194 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,0,0)) |
195 | ||
196 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
197 | ||
198 | static | |
199 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
200 | { | |
201 | int ret; | |
202 | ||
203 | ret = snprintf(name_buf, BDEVNAME_SIZE, "%pg", part); | |
204 | if (ret < 0 || ret >= BDEVNAME_SIZE) | |
205 | return -ENOSYS; | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | static | |
211 | dev_t lttng_get_part_devt(struct block_device *part) | |
212 | { | |
213 | return part->bd_dev; | |
214 | } | |
215 | ||
216 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0)) | |
fef7fe6a MJ |
217 | |
218 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
219 | ||
220 | static | |
221 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
222 | { | |
223 | const char *p; | |
224 | ||
225 | p = bdevname(part, name_buf); | |
226 | if (!p) | |
227 | return -ENOSYS; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static | |
233 | dev_t lttng_get_part_devt(struct block_device *part) | |
234 | { | |
235 | return part->bd_dev; | |
236 | } | |
237 | ||
238 | #else | |
239 | ||
240 | #define LTTNG_PART_STRUCT_TYPE struct hd_struct | |
241 | ||
242 | static | |
243 | int lttng_get_part_name(struct gendisk *disk, struct hd_struct *part, char *name_buf) | |
244 | { | |
245 | const char *p; | |
246 | struct block_device bdev; | |
247 | ||
248 | /* | |
249 | * Create a partial 'struct blockdevice' to use | |
250 | * 'bdevname()' which is a simple wrapper over | |
251 | * 'disk_name()' but has the honor to be EXPORT_SYMBOL. | |
252 | */ | |
253 | bdev.bd_disk = disk; | |
254 | bdev.bd_part = part; | |
255 | ||
256 | p = bdevname(&bdev, name_buf); | |
257 | if (!p) | |
258 | return -ENOSYS; | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static | |
264 | dev_t lttng_get_part_devt(struct hd_struct *part) | |
265 | { | |
266 | return part_devt(part); | |
267 | } | |
268 | #endif | |
269 | ||
481fd2a2 MJ |
270 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0)) |
271 | static | |
272 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
273 | { | |
274 | struct block_device *part; | |
275 | unsigned long idx; | |
276 | int ret = 0; | |
277 | ||
278 | /* Include partition 0 */ | |
279 | idx = 0; | |
280 | ||
281 | rcu_read_lock(); | |
282 | xa_for_each(&disk->part_tbl, idx, part) { | |
283 | char name_buf[BDEVNAME_SIZE]; | |
284 | ||
285 | /* Exclude non-partitions bdev and empty partitions. */ | |
286 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) | |
287 | continue; | |
288 | ||
289 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
290 | ret = -ENOSYS; | |
291 | goto end; | |
292 | } | |
293 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
294 | name_buf); | |
295 | } | |
296 | end: | |
297 | rcu_read_unlock(); | |
298 | return ret; | |
299 | } | |
300 | #else | |
301 | static | |
302 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
303 | { | |
304 | struct disk_part_iter piter; | |
305 | LTTNG_PART_STRUCT_TYPE *part; | |
306 | ||
307 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
308 | ||
309 | while ((part = disk_part_iter_next(&piter))) { | |
310 | char name_buf[BDEVNAME_SIZE]; | |
311 | ||
312 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
313 | disk_part_iter_exit(&piter); | |
314 | return -ENOSYS; | |
315 | } | |
316 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
317 | name_buf); | |
318 | } | |
319 | disk_part_iter_exit(&piter); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | #endif | |
324 | ||
f0dbdefb | 325 | static |
8cdc1a81 | 326 | int lttng_enumerate_block_devices(struct lttng_kernel_session *session) |
f0dbdefb HD |
327 | { |
328 | struct class *ptr_block_class; | |
329 | struct device_type *ptr_disk_type; | |
330 | struct class_dev_iter iter; | |
331 | struct device *dev; | |
7633c773 | 332 | int ret = 0; |
f0dbdefb HD |
333 | |
334 | ptr_block_class = wrapper_get_block_class(); | |
7633c773 MJ |
335 | if (!ptr_block_class) { |
336 | ret = -ENOSYS; | |
337 | goto end; | |
338 | } | |
f0dbdefb HD |
339 | ptr_disk_type = wrapper_get_disk_type(); |
340 | if (!ptr_disk_type) { | |
7633c773 MJ |
341 | ret = -ENOSYS; |
342 | goto end; | |
f0dbdefb HD |
343 | } |
344 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
345 | while ((dev = class_dev_iter_next(&iter))) { | |
f0dbdefb | 346 | struct gendisk *disk = dev_to_disk(dev); |
f0dbdefb | 347 | |
5a91f3df MD |
348 | /* |
349 | * Don't show empty devices or things that have been | |
350 | * suppressed | |
351 | */ | |
352 | if (get_capacity(disk) == 0 || | |
fe72ab45 | 353 | (disk->flags & LTTNG_GENHD_FL_HIDDEN)) |
5a91f3df MD |
354 | continue; |
355 | ||
481fd2a2 | 356 | ret = lttng_statedump_each_block_device(session, disk); |
f0dbdefb HD |
357 | } |
358 | class_dev_iter_exit(&iter); | |
7633c773 MJ |
359 | end: |
360 | return ret; | |
f0dbdefb HD |
361 | } |
362 | ||
c337ddc2 | 363 | #ifdef CONFIG_INET |
f0dbdefb | 364 | |
c337ddc2 | 365 | static |
8cdc1a81 | 366 | void lttng_enumerate_device(struct lttng_kernel_session *session, |
c337ddc2 MD |
367 | struct net_device *dev) |
368 | { | |
369 | struct in_device *in_dev; | |
370 | struct in_ifaddr *ifa; | |
371 | ||
372 | if (dev->flags & IFF_UP) { | |
373 | in_dev = in_dev_get(dev); | |
374 | if (in_dev) { | |
375 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
376 | ifa = ifa->ifa_next) { | |
377 | trace_lttng_statedump_network_interface( | |
378 | session, dev, ifa); | |
379 | } | |
380 | in_dev_put(in_dev); | |
381 | } | |
382 | } else { | |
383 | trace_lttng_statedump_network_interface( | |
384 | session, dev, NULL); | |
385 | } | |
386 | } | |
387 | ||
388 | static | |
8cdc1a81 | 389 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
390 | { |
391 | struct net_device *dev; | |
392 | ||
393 | read_lock(&dev_base_lock); | |
394 | for_each_netdev(&init_net, dev) | |
395 | lttng_enumerate_device(session, dev); | |
396 | read_unlock(&dev_base_lock); | |
397 | ||
398 | return 0; | |
399 | } | |
400 | #else /* CONFIG_INET */ | |
401 | static inline | |
8cdc1a81 | 402 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
403 | { |
404 | return 0; | |
405 | } | |
406 | #endif /* CONFIG_INET */ | |
407 | ||
361c023a MD |
408 | static |
409 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
410 | { | |
411 | const struct lttng_fd_ctx *ctx = p; | |
412 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 413 | unsigned int flags = file->f_flags; |
d561ecfb | 414 | struct fdtable *fdt; |
361c023a | 415 | |
29021503 MD |
416 | /* |
417 | * We don't expose kernel internal flags, only userspace-visible | |
418 | * flags. | |
419 | */ | |
420 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
421 | fdt = files_fdtable(ctx->files); |
422 | /* | |
423 | * We need to check here again whether fd is within the fdt | |
424 | * max_fds range, because we might be seeing a different | |
425 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
426 | * protecting the read. In reality, iterate_fd() holds | |
427 | * file_lock, which should ensure the fdt does not change while | |
428 | * the lock is taken, but we are not aware whether this is | |
429 | * guaranteed or not, so play safe. | |
430 | */ | |
1cbe11ed | 431 | if (fd < fdt->max_fds && close_on_exec(fd, fdt)) |
29021503 | 432 | flags |= O_CLOEXEC; |
361c023a MD |
433 | if (IS_ERR(s)) { |
434 | struct dentry *dentry = file->f_path.dentry; | |
435 | ||
436 | /* Make sure we give at least some info */ | |
437 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
438 | trace_lttng_statedump_file_descriptor(ctx->session, |
439 | ctx->files, fd, dentry->d_name.name, flags, | |
440 | file->f_mode); | |
361c023a MD |
441 | spin_unlock(&dentry->d_lock); |
442 | goto end; | |
443 | } | |
e7a0ca72 MD |
444 | trace_lttng_statedump_file_descriptor(ctx->session, |
445 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
446 | end: |
447 | return 0; | |
448 | } | |
c337ddc2 | 449 | |
e7a0ca72 | 450 | /* Called with task lock held. */ |
c337ddc2 | 451 | static |
8cdc1a81 | 452 | void lttng_enumerate_files(struct lttng_kernel_session *session, |
e7a0ca72 MD |
453 | struct files_struct *files, |
454 | char *tmp) | |
c337ddc2 | 455 | { |
e7a0ca72 | 456 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 457 | |
1cbe11ed | 458 | iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
459 | } |
460 | ||
d0b55e4c | 461 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 | 462 | static |
8cdc1a81 | 463 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
464 | { |
465 | int cpu; | |
466 | const cpumask_t *cpumask = cpu_possible_mask; | |
467 | ||
468 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
469 | cpu = cpumask_next(cpu, cpumask)) { | |
470 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
475 | #else | |
476 | static | |
8cdc1a81 | 477 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
478 | { |
479 | return 0; | |
480 | } | |
481 | #endif | |
482 | ||
0658bdda MD |
483 | #if 0 |
484 | /* | |
485 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
486 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
487 | * iteration, but it is not exported to modules. | |
488 | */ | |
c337ddc2 | 489 | static |
8cdc1a81 | 490 | void lttng_enumerate_task_vm_maps(struct lttng_kernel_session *session, |
c337ddc2 MD |
491 | struct task_struct *p) |
492 | { | |
493 | struct mm_struct *mm; | |
494 | struct vm_area_struct *map; | |
495 | unsigned long ino; | |
496 | ||
497 | /* get_task_mm does a task_lock... */ | |
498 | mm = get_task_mm(p); | |
499 | if (!mm) | |
500 | return; | |
501 | ||
502 | map = mm->mmap; | |
503 | if (map) { | |
504 | down_read(&mm->mmap_sem); | |
505 | while (map) { | |
506 | if (map->vm_file) | |
2a059b14 | 507 | ino = map->vm_file->f_path.dentry->d_inode->i_ino; |
c337ddc2 MD |
508 | else |
509 | ino = 0; | |
510 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
511 | map = map->vm_next; | |
512 | } | |
513 | up_read(&mm->mmap_sem); | |
514 | } | |
515 | mmput(mm); | |
516 | } | |
517 | ||
518 | static | |
8cdc1a81 | 519 | int lttng_enumerate_vm_maps(struct lttng_kernel_session *session) |
c337ddc2 MD |
520 | { |
521 | struct task_struct *p; | |
522 | ||
523 | rcu_read_lock(); | |
524 | for_each_process(p) | |
525 | lttng_enumerate_task_vm_maps(session, p); | |
526 | rcu_read_unlock(); | |
527 | return 0; | |
528 | } | |
0658bdda | 529 | #endif |
c337ddc2 | 530 | |
c337ddc2 | 531 | static |
8cdc1a81 | 532 | int lttng_list_interrupts(struct lttng_kernel_session *session) |
c337ddc2 MD |
533 | { |
534 | unsigned int irq; | |
535 | unsigned long flags = 0; | |
536 | struct irq_desc *desc; | |
537 | ||
538 | #define irq_to_desc wrapper_irq_to_desc | |
539 | /* needs irq_desc */ | |
540 | for_each_irq_desc(irq, desc) { | |
541 | struct irqaction *action; | |
542 | const char *irq_chip_name = | |
543 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
544 | ||
545 | local_irq_save(flags); | |
fc94c945 | 546 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
547 | for (action = desc->action; action; action = action->next) { |
548 | trace_lttng_statedump_interrupt(session, | |
549 | irq, irq_chip_name, action); | |
550 | } | |
fc94c945 | 551 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
552 | local_irq_restore(flags); |
553 | } | |
cfcee1c7 | 554 | return 0; |
c337ddc2 MD |
555 | #undef irq_to_desc |
556 | } | |
c337ddc2 | 557 | |
4ba1f53c | 558 | /* |
1965e6b4 MJ |
559 | * Statedump the task's namespaces using the proc filesystem inode number as |
560 | * the unique identifier. The user and pid ns are nested and will be dumped | |
561 | * recursively. | |
562 | * | |
4ba1f53c MD |
563 | * Called with task lock held. |
564 | */ | |
73e8ba37 | 565 | static |
8cdc1a81 | 566 | void lttng_statedump_process_ns(struct lttng_kernel_session *session, |
73e8ba37 JD |
567 | struct task_struct *p, |
568 | enum lttng_thread_type type, | |
569 | enum lttng_execution_mode mode, | |
570 | enum lttng_execution_submode submode, | |
571 | enum lttng_process_status status) | |
572 | { | |
1965e6b4 | 573 | struct nsproxy *proxy; |
73e8ba37 | 574 | struct pid_namespace *pid_ns; |
1965e6b4 | 575 | struct user_namespace *user_ns; |
73e8ba37 | 576 | |
1965e6b4 MJ |
577 | /* |
578 | * The pid and user namespaces are special, they are nested and | |
579 | * accessed with specific functions instead of the nsproxy struct | |
580 | * like the other namespaces. | |
581 | */ | |
887bcdac MJ |
582 | pid_ns = task_active_pid_ns(p); |
583 | do { | |
1965e6b4 | 584 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 585 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 586 | } while (pid_ns); |
1965e6b4 MJ |
587 | |
588 | ||
589 | user_ns = task_cred_xxx(p, user_ns); | |
590 | do { | |
591 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
592 | /* |
593 | * trace_lttng_statedump_process_user_ns() internally | |
594 | * checks whether user_ns is NULL. While this does not | |
595 | * appear to be a possible return value for | |
596 | * task_cred_xxx(), err on the safe side and check | |
597 | * for NULL here as well to be consistent with the | |
598 | * paranoid behavior of | |
599 | * trace_lttng_statedump_process_user_ns(). | |
600 | */ | |
93e5bcec | 601 | user_ns = user_ns ? user_ns->parent : NULL; |
1965e6b4 MJ |
602 | } while (user_ns); |
603 | ||
1965e6b4 | 604 | proxy = p->nsproxy; |
7724cf27 | 605 | |
1965e6b4 | 606 | if (proxy) { |
5f4c791e | 607 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
1965e6b4 MJ |
608 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); |
609 | #endif | |
610 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
611 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
612 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
613 | #endif | |
614 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
615 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
fce87a6e MJ |
616 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \ |
617 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0)) | |
876e2e92 MJ |
618 | trace_lttng_statedump_process_time_ns(session, p, proxy->time_ns); |
619 | #endif | |
1965e6b4 | 620 | } |
73e8ba37 JD |
621 | } |
622 | ||
c337ddc2 | 623 | static |
8cdc1a81 | 624 | int lttng_enumerate_process_states(struct lttng_kernel_session *session) |
c337ddc2 MD |
625 | { |
626 | struct task_struct *g, *p; | |
e7a0ca72 MD |
627 | char *tmp; |
628 | ||
629 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
630 | if (!tmp) | |
631 | return -ENOMEM; | |
c337ddc2 MD |
632 | |
633 | rcu_read_lock(); | |
634 | for_each_process(g) { | |
e7a0ca72 MD |
635 | struct files_struct *prev_files = NULL; |
636 | ||
c337ddc2 MD |
637 | p = g; |
638 | do { | |
639 | enum lttng_execution_mode mode = | |
640 | LTTNG_MODE_UNKNOWN; | |
641 | enum lttng_execution_submode submode = | |
642 | LTTNG_UNKNOWN; | |
643 | enum lttng_process_status status; | |
644 | enum lttng_thread_type type; | |
e7a0ca72 | 645 | struct files_struct *files; |
c337ddc2 MD |
646 | |
647 | task_lock(p); | |
648 | if (p->exit_state == EXIT_ZOMBIE) | |
649 | status = LTTNG_ZOMBIE; | |
650 | else if (p->exit_state == EXIT_DEAD) | |
651 | status = LTTNG_DEAD; | |
7259e6a5 | 652 | else if (lttng_task_is_running(p)) { |
c337ddc2 MD |
653 | /* Is this a forked child that has not run yet? */ |
654 | if (list_empty(&p->rt.run_list)) | |
655 | status = LTTNG_WAIT_FORK; | |
656 | else | |
657 | /* | |
658 | * All tasks are considered as wait_cpu; | |
659 | * the viewer will sort out if the task | |
660 | * was really running at this time. | |
661 | */ | |
662 | status = LTTNG_WAIT_CPU; | |
7259e6a5 | 663 | } else if (lttng_get_task_state(p) & |
c337ddc2 MD |
664 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { |
665 | /* Task is waiting for something to complete */ | |
666 | status = LTTNG_WAIT; | |
667 | } else | |
668 | status = LTTNG_UNNAMED; | |
669 | submode = LTTNG_NONE; | |
670 | ||
671 | /* | |
672 | * Verification of t->mm is to filter out kernel | |
673 | * threads; Viewer will further filter out if a | |
674 | * user-space thread was in syscall mode or not. | |
675 | */ | |
676 | if (p->mm) | |
677 | type = LTTNG_USER_THREAD; | |
678 | else | |
679 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 680 | files = p->files; |
d2a927ac MJ |
681 | |
682 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 683 | p, type, mode, submode, status, files); |
73e8ba37 | 684 | lttng_statedump_process_ns(session, |
c337ddc2 | 685 | p, type, mode, submode, status); |
e7a0ca72 MD |
686 | /* |
687 | * As an optimisation for the common case, do not | |
688 | * repeat information for the same files_struct in | |
689 | * two consecutive threads. This is the common case | |
690 | * for threads sharing the same fd table. RCU guarantees | |
691 | * that the same files_struct pointer is not re-used | |
692 | * throughout processes/threads iteration. | |
693 | */ | |
694 | if (files && files != prev_files) { | |
695 | lttng_enumerate_files(session, files, tmp); | |
696 | prev_files = files; | |
697 | } | |
c337ddc2 MD |
698 | task_unlock(p); |
699 | } while_each_thread(g, p); | |
700 | } | |
701 | rcu_read_unlock(); | |
702 | ||
e7a0ca72 MD |
703 | free_page((unsigned long) tmp); |
704 | ||
c337ddc2 MD |
705 | return 0; |
706 | } | |
707 | ||
708 | static | |
709 | void lttng_statedump_work_func(struct work_struct *work) | |
710 | { | |
711 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
712 | /* If we are the last thread, wake up do_lttng_statedump */ | |
713 | wake_up(&statedump_wq); | |
714 | } | |
715 | ||
716 | static | |
8cdc1a81 | 717 | int do_lttng_statedump(struct lttng_kernel_session *session) |
c337ddc2 | 718 | { |
cfcee1c7 | 719 | int cpu, ret; |
c337ddc2 | 720 | |
c337ddc2 | 721 | trace_lttng_statedump_start(session); |
cfcee1c7 | 722 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
723 | if (ret) |
724 | return ret; | |
725 | /* | |
726 | * FIXME | |
727 | * ret = lttng_enumerate_vm_maps(session); | |
728 | * if (ret) | |
729 | * return ret; | |
730 | */ | |
731 | ret = lttng_list_interrupts(session); | |
732 | if (ret) | |
733 | return ret; | |
734 | ret = lttng_enumerate_network_ip_interface(session); | |
735 | if (ret) | |
736 | return ret; | |
737 | ret = lttng_enumerate_block_devices(session); | |
738 | switch (ret) { | |
84c7055e MD |
739 | case 0: |
740 | break; | |
cfcee1c7 MD |
741 | case -ENOSYS: |
742 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
743 | break; | |
744 | default: | |
745 | return ret; | |
746 | } | |
502e4132 JD |
747 | ret = lttng_enumerate_cpu_topology(session); |
748 | if (ret) | |
749 | return ret; | |
c337ddc2 MD |
750 | |
751 | /* TODO lttng_dump_idt_table(session); */ | |
752 | /* TODO lttng_dump_softirq_vec(session); */ | |
753 | /* TODO lttng_list_modules(session); */ | |
754 | /* TODO lttng_dump_swap_files(session); */ | |
755 | ||
756 | /* | |
757 | * Fire off a work queue on each CPU. Their sole purpose in life | |
758 | * is to guarantee that each CPU has been in a state where is was in | |
759 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
760 | */ | |
ffcc8734 | 761 | lttng_cpus_read_lock(); |
c337ddc2 MD |
762 | atomic_set(&kernel_threads_to_run, num_online_cpus()); |
763 | for_each_online_cpu(cpu) { | |
764 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
765 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
766 | } | |
767 | /* Wait for all threads to run */ | |
7a7128e0 | 768 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
ffcc8734 | 769 | lttng_cpus_read_unlock(); |
c337ddc2 | 770 | /* Our work is done */ |
c337ddc2 MD |
771 | trace_lttng_statedump_end(session); |
772 | return 0; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Called with session mutex held. | |
777 | */ | |
8cdc1a81 | 778 | int lttng_statedump_start(struct lttng_kernel_session *session) |
c337ddc2 | 779 | { |
c337ddc2 MD |
780 | return do_lttng_statedump(session); |
781 | } | |
782 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
783 | ||
dd8d5afb MD |
784 | static |
785 | int __init lttng_statedump_init(void) | |
786 | { | |
d16aa9c9 | 787 | return 0; |
dd8d5afb MD |
788 | } |
789 | ||
790 | module_init(lttng_statedump_init); | |
791 | ||
461277e7 MD |
792 | static |
793 | void __exit lttng_statedump_exit(void) | |
794 | { | |
795 | } | |
796 | ||
797 | module_exit(lttng_statedump_exit); | |
798 | ||
c337ddc2 MD |
799 | MODULE_LICENSE("GPL and additional rights"); |
800 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 801 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
802 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
803 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
804 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
805 | LTTNG_MODULES_EXTRAVERSION); |