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> | |
0f7e7309 | 39 | #include <lttng/events-internal.h> |
ffcc8734 | 40 | #include <wrapper/cpu.h> |
241ae9a8 | 41 | #include <wrapper/irqdesc.h> |
241ae9a8 | 42 | #include <wrapper/fdtable.h> |
241ae9a8 | 43 | #include <wrapper/tracepoint.h> |
82fbf9d3 | 44 | #include <wrapper/blkdev.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 | |
a9d49ac6 MH |
194 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,0,0) || \ |
195 | LTTNG_RHEL_KERNEL_RANGE(5,14,0,163,0,0, 5,15,0,0,0,0)) | |
cc92a211 MJ |
196 | |
197 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
198 | ||
199 | static | |
200 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
201 | { | |
202 | int ret; | |
203 | ||
204 | ret = snprintf(name_buf, BDEVNAME_SIZE, "%pg", part); | |
205 | if (ret < 0 || ret >= BDEVNAME_SIZE) | |
206 | return -ENOSYS; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static | |
212 | dev_t lttng_get_part_devt(struct block_device *part) | |
213 | { | |
214 | return part->bd_dev; | |
215 | } | |
216 | ||
217 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0)) | |
fef7fe6a MJ |
218 | |
219 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
220 | ||
221 | static | |
222 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
223 | { | |
224 | const char *p; | |
225 | ||
226 | p = bdevname(part, name_buf); | |
227 | if (!p) | |
228 | return -ENOSYS; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static | |
234 | dev_t lttng_get_part_devt(struct block_device *part) | |
235 | { | |
236 | return part->bd_dev; | |
237 | } | |
238 | ||
239 | #else | |
240 | ||
241 | #define LTTNG_PART_STRUCT_TYPE struct hd_struct | |
242 | ||
243 | static | |
244 | int lttng_get_part_name(struct gendisk *disk, struct hd_struct *part, char *name_buf) | |
245 | { | |
246 | const char *p; | |
247 | struct block_device bdev; | |
248 | ||
249 | /* | |
250 | * Create a partial 'struct blockdevice' to use | |
251 | * 'bdevname()' which is a simple wrapper over | |
252 | * 'disk_name()' but has the honor to be EXPORT_SYMBOL. | |
253 | */ | |
254 | bdev.bd_disk = disk; | |
255 | bdev.bd_part = part; | |
256 | ||
257 | p = bdevname(&bdev, name_buf); | |
258 | if (!p) | |
259 | return -ENOSYS; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static | |
265 | dev_t lttng_get_part_devt(struct hd_struct *part) | |
266 | { | |
267 | return part_devt(part); | |
268 | } | |
269 | #endif | |
270 | ||
481fd2a2 MJ |
271 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0)) |
272 | static | |
273 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
274 | { | |
275 | struct block_device *part; | |
276 | unsigned long idx; | |
277 | int ret = 0; | |
278 | ||
279 | /* Include partition 0 */ | |
280 | idx = 0; | |
281 | ||
282 | rcu_read_lock(); | |
283 | xa_for_each(&disk->part_tbl, idx, part) { | |
284 | char name_buf[BDEVNAME_SIZE]; | |
285 | ||
286 | /* Exclude non-partitions bdev and empty partitions. */ | |
287 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) | |
288 | continue; | |
289 | ||
290 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
291 | ret = -ENOSYS; | |
292 | goto end; | |
293 | } | |
294 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
295 | name_buf); | |
296 | } | |
297 | end: | |
298 | rcu_read_unlock(); | |
299 | return ret; | |
300 | } | |
301 | #else | |
302 | static | |
303 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
304 | { | |
305 | struct disk_part_iter piter; | |
306 | LTTNG_PART_STRUCT_TYPE *part; | |
307 | ||
308 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
309 | ||
310 | while ((part = disk_part_iter_next(&piter))) { | |
311 | char name_buf[BDEVNAME_SIZE]; | |
312 | ||
313 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
314 | disk_part_iter_exit(&piter); | |
315 | return -ENOSYS; | |
316 | } | |
317 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
318 | name_buf); | |
319 | } | |
320 | disk_part_iter_exit(&piter); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | #endif | |
325 | ||
f0dbdefb | 326 | static |
8cdc1a81 | 327 | int lttng_enumerate_block_devices(struct lttng_kernel_session *session) |
f0dbdefb HD |
328 | { |
329 | struct class *ptr_block_class; | |
330 | struct device_type *ptr_disk_type; | |
331 | struct class_dev_iter iter; | |
332 | struct device *dev; | |
7633c773 | 333 | int ret = 0; |
f0dbdefb HD |
334 | |
335 | ptr_block_class = wrapper_get_block_class(); | |
7633c773 MJ |
336 | if (!ptr_block_class) { |
337 | ret = -ENOSYS; | |
338 | goto end; | |
339 | } | |
f0dbdefb HD |
340 | ptr_disk_type = wrapper_get_disk_type(); |
341 | if (!ptr_disk_type) { | |
7633c773 MJ |
342 | ret = -ENOSYS; |
343 | goto end; | |
f0dbdefb HD |
344 | } |
345 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
346 | while ((dev = class_dev_iter_next(&iter))) { | |
f0dbdefb | 347 | struct gendisk *disk = dev_to_disk(dev); |
f0dbdefb | 348 | |
5a91f3df MD |
349 | /* |
350 | * Don't show empty devices or things that have been | |
351 | * suppressed | |
352 | */ | |
353 | if (get_capacity(disk) == 0 || | |
fe72ab45 | 354 | (disk->flags & LTTNG_GENHD_FL_HIDDEN)) |
5a91f3df MD |
355 | continue; |
356 | ||
481fd2a2 | 357 | ret = lttng_statedump_each_block_device(session, disk); |
f0dbdefb HD |
358 | } |
359 | class_dev_iter_exit(&iter); | |
7633c773 MJ |
360 | end: |
361 | return ret; | |
f0dbdefb HD |
362 | } |
363 | ||
c337ddc2 | 364 | #ifdef CONFIG_INET |
f0dbdefb | 365 | |
c337ddc2 | 366 | static |
8cdc1a81 | 367 | void lttng_enumerate_device(struct lttng_kernel_session *session, |
c337ddc2 MD |
368 | struct net_device *dev) |
369 | { | |
370 | struct in_device *in_dev; | |
371 | struct in_ifaddr *ifa; | |
372 | ||
373 | if (dev->flags & IFF_UP) { | |
374 | in_dev = in_dev_get(dev); | |
375 | if (in_dev) { | |
376 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
377 | ifa = ifa->ifa_next) { | |
378 | trace_lttng_statedump_network_interface( | |
379 | session, dev, ifa); | |
380 | } | |
381 | in_dev_put(in_dev); | |
382 | } | |
383 | } else { | |
384 | trace_lttng_statedump_network_interface( | |
385 | session, dev, NULL); | |
386 | } | |
387 | } | |
388 | ||
217bc2e4 KS |
389 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) |
390 | static | |
391 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) | |
392 | { | |
393 | struct net_device *dev; | |
394 | ||
395 | rtnl_lock(); | |
396 | for_each_netdev(&init_net, dev) | |
397 | lttng_enumerate_device(session, dev); | |
398 | rtnl_unlock(); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | #else | |
c337ddc2 | 403 | static |
8cdc1a81 | 404 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
405 | { |
406 | struct net_device *dev; | |
407 | ||
408 | read_lock(&dev_base_lock); | |
409 | for_each_netdev(&init_net, dev) | |
410 | lttng_enumerate_device(session, dev); | |
411 | read_unlock(&dev_base_lock); | |
412 | ||
413 | return 0; | |
414 | } | |
217bc2e4 | 415 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) */ |
c337ddc2 MD |
416 | #else /* CONFIG_INET */ |
417 | static inline | |
8cdc1a81 | 418 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
419 | { |
420 | return 0; | |
421 | } | |
422 | #endif /* CONFIG_INET */ | |
423 | ||
361c023a MD |
424 | static |
425 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
426 | { | |
427 | const struct lttng_fd_ctx *ctx = p; | |
428 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 429 | unsigned int flags = file->f_flags; |
d561ecfb | 430 | struct fdtable *fdt; |
361c023a | 431 | |
29021503 MD |
432 | /* |
433 | * We don't expose kernel internal flags, only userspace-visible | |
434 | * flags. | |
435 | */ | |
436 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
437 | fdt = files_fdtable(ctx->files); |
438 | /* | |
439 | * We need to check here again whether fd is within the fdt | |
440 | * max_fds range, because we might be seeing a different | |
441 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
442 | * protecting the read. In reality, iterate_fd() holds | |
443 | * file_lock, which should ensure the fdt does not change while | |
444 | * the lock is taken, but we are not aware whether this is | |
445 | * guaranteed or not, so play safe. | |
446 | */ | |
c8adc20d | 447 | if (fd < fdt->max_fds && lttng_close_on_exec(fd, ctx->files)) |
29021503 | 448 | flags |= O_CLOEXEC; |
361c023a MD |
449 | if (IS_ERR(s)) { |
450 | struct dentry *dentry = file->f_path.dentry; | |
451 | ||
452 | /* Make sure we give at least some info */ | |
453 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
454 | trace_lttng_statedump_file_descriptor(ctx->session, |
455 | ctx->files, fd, dentry->d_name.name, flags, | |
456 | file->f_mode); | |
361c023a MD |
457 | spin_unlock(&dentry->d_lock); |
458 | goto end; | |
459 | } | |
e7a0ca72 MD |
460 | trace_lttng_statedump_file_descriptor(ctx->session, |
461 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
462 | end: |
463 | return 0; | |
464 | } | |
c337ddc2 | 465 | |
e7a0ca72 | 466 | /* Called with task lock held. */ |
c337ddc2 | 467 | static |
8cdc1a81 | 468 | void lttng_enumerate_files(struct lttng_kernel_session *session, |
e7a0ca72 MD |
469 | struct files_struct *files, |
470 | char *tmp) | |
c337ddc2 | 471 | { |
e7a0ca72 | 472 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 473 | |
1cbe11ed | 474 | iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
475 | } |
476 | ||
d0b55e4c | 477 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 | 478 | static |
8cdc1a81 | 479 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
480 | { |
481 | int cpu; | |
482 | const cpumask_t *cpumask = cpu_possible_mask; | |
483 | ||
484 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
485 | cpu = cpumask_next(cpu, cpumask)) { | |
486 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | #else | |
492 | static | |
8cdc1a81 | 493 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
494 | { |
495 | return 0; | |
496 | } | |
497 | #endif | |
498 | ||
0658bdda MD |
499 | #if 0 |
500 | /* | |
501 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
502 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
503 | * iteration, but it is not exported to modules. | |
504 | */ | |
c337ddc2 | 505 | static |
8cdc1a81 | 506 | void lttng_enumerate_task_vm_maps(struct lttng_kernel_session *session, |
c337ddc2 MD |
507 | struct task_struct *p) |
508 | { | |
509 | struct mm_struct *mm; | |
510 | struct vm_area_struct *map; | |
511 | unsigned long ino; | |
512 | ||
513 | /* get_task_mm does a task_lock... */ | |
514 | mm = get_task_mm(p); | |
515 | if (!mm) | |
516 | return; | |
517 | ||
518 | map = mm->mmap; | |
519 | if (map) { | |
520 | down_read(&mm->mmap_sem); | |
521 | while (map) { | |
522 | if (map->vm_file) | |
2a059b14 | 523 | ino = map->vm_file->f_path.dentry->d_inode->i_ino; |
c337ddc2 MD |
524 | else |
525 | ino = 0; | |
526 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
527 | map = map->vm_next; | |
528 | } | |
529 | up_read(&mm->mmap_sem); | |
530 | } | |
531 | mmput(mm); | |
532 | } | |
533 | ||
534 | static | |
8cdc1a81 | 535 | int lttng_enumerate_vm_maps(struct lttng_kernel_session *session) |
c337ddc2 MD |
536 | { |
537 | struct task_struct *p; | |
538 | ||
539 | rcu_read_lock(); | |
540 | for_each_process(p) | |
541 | lttng_enumerate_task_vm_maps(session, p); | |
542 | rcu_read_unlock(); | |
543 | return 0; | |
544 | } | |
0658bdda | 545 | #endif |
c337ddc2 | 546 | |
c337ddc2 | 547 | static |
8cdc1a81 | 548 | int lttng_list_interrupts(struct lttng_kernel_session *session) |
c337ddc2 MD |
549 | { |
550 | unsigned int irq; | |
551 | unsigned long flags = 0; | |
552 | struct irq_desc *desc; | |
553 | ||
554 | #define irq_to_desc wrapper_irq_to_desc | |
555 | /* needs irq_desc */ | |
556 | for_each_irq_desc(irq, desc) { | |
557 | struct irqaction *action; | |
558 | const char *irq_chip_name = | |
559 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
560 | ||
561 | local_irq_save(flags); | |
fc94c945 | 562 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
563 | for (action = desc->action; action; action = action->next) { |
564 | trace_lttng_statedump_interrupt(session, | |
565 | irq, irq_chip_name, action); | |
566 | } | |
fc94c945 | 567 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
568 | local_irq_restore(flags); |
569 | } | |
cfcee1c7 | 570 | return 0; |
c337ddc2 MD |
571 | #undef irq_to_desc |
572 | } | |
c337ddc2 | 573 | |
4ba1f53c | 574 | /* |
1965e6b4 MJ |
575 | * Statedump the task's namespaces using the proc filesystem inode number as |
576 | * the unique identifier. The user and pid ns are nested and will be dumped | |
577 | * recursively. | |
578 | * | |
4ba1f53c MD |
579 | * Called with task lock held. |
580 | */ | |
73e8ba37 | 581 | static |
8cdc1a81 | 582 | void lttng_statedump_process_ns(struct lttng_kernel_session *session, |
73e8ba37 JD |
583 | struct task_struct *p, |
584 | enum lttng_thread_type type, | |
585 | enum lttng_execution_mode mode, | |
586 | enum lttng_execution_submode submode, | |
587 | enum lttng_process_status status) | |
588 | { | |
1965e6b4 | 589 | struct nsproxy *proxy; |
73e8ba37 | 590 | struct pid_namespace *pid_ns; |
1965e6b4 | 591 | struct user_namespace *user_ns; |
73e8ba37 | 592 | |
1965e6b4 MJ |
593 | /* |
594 | * The pid and user namespaces are special, they are nested and | |
595 | * accessed with specific functions instead of the nsproxy struct | |
596 | * like the other namespaces. | |
597 | */ | |
887bcdac MJ |
598 | pid_ns = task_active_pid_ns(p); |
599 | do { | |
1965e6b4 | 600 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 601 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 602 | } while (pid_ns); |
1965e6b4 MJ |
603 | |
604 | ||
605 | user_ns = task_cred_xxx(p, user_ns); | |
606 | do { | |
607 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
608 | /* |
609 | * trace_lttng_statedump_process_user_ns() internally | |
610 | * checks whether user_ns is NULL. While this does not | |
611 | * appear to be a possible return value for | |
612 | * task_cred_xxx(), err on the safe side and check | |
613 | * for NULL here as well to be consistent with the | |
614 | * paranoid behavior of | |
615 | * trace_lttng_statedump_process_user_ns(). | |
616 | */ | |
93e5bcec | 617 | user_ns = user_ns ? user_ns->parent : NULL; |
1965e6b4 MJ |
618 | } while (user_ns); |
619 | ||
1965e6b4 | 620 | proxy = p->nsproxy; |
7724cf27 | 621 | |
1965e6b4 | 622 | if (proxy) { |
5f4c791e | 623 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
1965e6b4 MJ |
624 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); |
625 | #endif | |
626 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
627 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
628 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
629 | #endif | |
630 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
631 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
fce87a6e MJ |
632 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \ |
633 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0)) | |
876e2e92 MJ |
634 | trace_lttng_statedump_process_time_ns(session, p, proxy->time_ns); |
635 | #endif | |
1965e6b4 | 636 | } |
73e8ba37 JD |
637 | } |
638 | ||
c337ddc2 | 639 | static |
8cdc1a81 | 640 | int lttng_enumerate_process_states(struct lttng_kernel_session *session) |
c337ddc2 MD |
641 | { |
642 | struct task_struct *g, *p; | |
e7a0ca72 MD |
643 | char *tmp; |
644 | ||
645 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
646 | if (!tmp) | |
647 | return -ENOMEM; | |
c337ddc2 MD |
648 | |
649 | rcu_read_lock(); | |
650 | for_each_process(g) { | |
e7a0ca72 MD |
651 | struct files_struct *prev_files = NULL; |
652 | ||
c337ddc2 MD |
653 | p = g; |
654 | do { | |
655 | enum lttng_execution_mode mode = | |
656 | LTTNG_MODE_UNKNOWN; | |
657 | enum lttng_execution_submode submode = | |
658 | LTTNG_UNKNOWN; | |
659 | enum lttng_process_status status; | |
660 | enum lttng_thread_type type; | |
e7a0ca72 | 661 | struct files_struct *files; |
c337ddc2 MD |
662 | |
663 | task_lock(p); | |
664 | if (p->exit_state == EXIT_ZOMBIE) | |
665 | status = LTTNG_ZOMBIE; | |
666 | else if (p->exit_state == EXIT_DEAD) | |
667 | status = LTTNG_DEAD; | |
7259e6a5 | 668 | else if (lttng_task_is_running(p)) { |
c337ddc2 MD |
669 | /* Is this a forked child that has not run yet? */ |
670 | if (list_empty(&p->rt.run_list)) | |
671 | status = LTTNG_WAIT_FORK; | |
672 | else | |
673 | /* | |
674 | * All tasks are considered as wait_cpu; | |
675 | * the viewer will sort out if the task | |
676 | * was really running at this time. | |
677 | */ | |
678 | status = LTTNG_WAIT_CPU; | |
7259e6a5 | 679 | } else if (lttng_get_task_state(p) & |
c337ddc2 MD |
680 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { |
681 | /* Task is waiting for something to complete */ | |
682 | status = LTTNG_WAIT; | |
683 | } else | |
684 | status = LTTNG_UNNAMED; | |
685 | submode = LTTNG_NONE; | |
686 | ||
687 | /* | |
688 | * Verification of t->mm is to filter out kernel | |
689 | * threads; Viewer will further filter out if a | |
690 | * user-space thread was in syscall mode or not. | |
691 | */ | |
692 | if (p->mm) | |
693 | type = LTTNG_USER_THREAD; | |
694 | else | |
695 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 696 | files = p->files; |
d2a927ac MJ |
697 | |
698 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 699 | p, type, mode, submode, status, files); |
73e8ba37 | 700 | lttng_statedump_process_ns(session, |
c337ddc2 | 701 | p, type, mode, submode, status); |
e7a0ca72 MD |
702 | /* |
703 | * As an optimisation for the common case, do not | |
704 | * repeat information for the same files_struct in | |
705 | * two consecutive threads. This is the common case | |
706 | * for threads sharing the same fd table. RCU guarantees | |
707 | * that the same files_struct pointer is not re-used | |
708 | * throughout processes/threads iteration. | |
709 | */ | |
710 | if (files && files != prev_files) { | |
711 | lttng_enumerate_files(session, files, tmp); | |
712 | prev_files = files; | |
713 | } | |
c337ddc2 MD |
714 | task_unlock(p); |
715 | } while_each_thread(g, p); | |
716 | } | |
717 | rcu_read_unlock(); | |
718 | ||
e7a0ca72 MD |
719 | free_page((unsigned long) tmp); |
720 | ||
c337ddc2 MD |
721 | return 0; |
722 | } | |
723 | ||
724 | static | |
725 | void lttng_statedump_work_func(struct work_struct *work) | |
726 | { | |
727 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
728 | /* If we are the last thread, wake up do_lttng_statedump */ | |
729 | wake_up(&statedump_wq); | |
730 | } | |
731 | ||
732 | static | |
8cdc1a81 | 733 | int do_lttng_statedump(struct lttng_kernel_session *session) |
c337ddc2 | 734 | { |
cfcee1c7 | 735 | int cpu, ret; |
c337ddc2 | 736 | |
c337ddc2 | 737 | trace_lttng_statedump_start(session); |
cfcee1c7 | 738 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
739 | if (ret) |
740 | return ret; | |
741 | /* | |
742 | * FIXME | |
743 | * ret = lttng_enumerate_vm_maps(session); | |
744 | * if (ret) | |
745 | * return ret; | |
746 | */ | |
747 | ret = lttng_list_interrupts(session); | |
748 | if (ret) | |
749 | return ret; | |
750 | ret = lttng_enumerate_network_ip_interface(session); | |
751 | if (ret) | |
752 | return ret; | |
753 | ret = lttng_enumerate_block_devices(session); | |
754 | switch (ret) { | |
84c7055e MD |
755 | case 0: |
756 | break; | |
cfcee1c7 MD |
757 | case -ENOSYS: |
758 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
759 | break; | |
760 | default: | |
761 | return ret; | |
762 | } | |
502e4132 JD |
763 | ret = lttng_enumerate_cpu_topology(session); |
764 | if (ret) | |
765 | return ret; | |
c337ddc2 MD |
766 | |
767 | /* TODO lttng_dump_idt_table(session); */ | |
768 | /* TODO lttng_dump_softirq_vec(session); */ | |
769 | /* TODO lttng_list_modules(session); */ | |
770 | /* TODO lttng_dump_swap_files(session); */ | |
771 | ||
772 | /* | |
773 | * Fire off a work queue on each CPU. Their sole purpose in life | |
774 | * is to guarantee that each CPU has been in a state where is was in | |
775 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
776 | */ | |
ffcc8734 | 777 | lttng_cpus_read_lock(); |
c337ddc2 MD |
778 | atomic_set(&kernel_threads_to_run, num_online_cpus()); |
779 | for_each_online_cpu(cpu) { | |
780 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
781 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
782 | } | |
783 | /* Wait for all threads to run */ | |
7a7128e0 | 784 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
ffcc8734 | 785 | lttng_cpus_read_unlock(); |
c337ddc2 | 786 | /* Our work is done */ |
c337ddc2 MD |
787 | trace_lttng_statedump_end(session); |
788 | return 0; | |
789 | } | |
790 | ||
791 | /* | |
792 | * Called with session mutex held. | |
793 | */ | |
8cdc1a81 | 794 | int lttng_statedump_start(struct lttng_kernel_session *session) |
c337ddc2 | 795 | { |
c337ddc2 MD |
796 | return do_lttng_statedump(session); |
797 | } | |
798 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
799 | ||
dd8d5afb MD |
800 | static |
801 | int __init lttng_statedump_init(void) | |
802 | { | |
d16aa9c9 | 803 | return 0; |
dd8d5afb MD |
804 | } |
805 | ||
806 | module_init(lttng_statedump_init); | |
807 | ||
461277e7 MD |
808 | static |
809 | void __exit lttng_statedump_exit(void) | |
810 | { | |
811 | } | |
812 | ||
813 | module_exit(lttng_statedump_exit); | |
814 | ||
c337ddc2 MD |
815 | MODULE_LICENSE("GPL and additional rights"); |
816 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 817 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
818 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
819 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
820 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
821 | LTTNG_MODULES_EXTRAVERSION); |