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> |
c07dca48 | 45 | #include <wrapper/fdtable.h> |
7259e6a5 | 46 | #include <wrapper/sched.h> |
c337ddc2 | 47 | |
c337ddc2 MD |
48 | /* Define the tracepoints, but do not build the probes */ |
49 | #define CREATE_TRACE_POINTS | |
4f47ccf0 | 50 | #define TRACE_INCLUDE_PATH instrumentation/events |
c337ddc2 | 51 | #define TRACE_INCLUDE_FILE lttng-statedump |
3bc29f0a | 52 | #define LTTNG_INSTRUMENTATION |
4f47ccf0 | 53 | #include <instrumentation/events/lttng-statedump.h> |
c337ddc2 | 54 | |
0116245f | 55 | LTTNG_DEFINE_TRACE(lttng_statedump_block_device, |
8cdc1a81 | 56 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
57 | dev_t dev, const char *diskname), |
58 | TP_ARGS(session, dev, diskname)); | |
59 | ||
60 | LTTNG_DEFINE_TRACE(lttng_statedump_end, | |
8cdc1a81 | 61 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
62 | TP_ARGS(session)); |
63 | ||
64 | LTTNG_DEFINE_TRACE(lttng_statedump_interrupt, | |
8cdc1a81 | 65 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
66 | unsigned int irq, const char *chip_name, |
67 | struct irqaction *action), | |
68 | TP_ARGS(session, irq, chip_name, action)); | |
69 | ||
70 | LTTNG_DEFINE_TRACE(lttng_statedump_file_descriptor, | |
8cdc1a81 | 71 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
72 | struct files_struct *files, |
73 | int fd, const char *filename, | |
74 | unsigned int flags, fmode_t fmode), | |
75 | TP_ARGS(session, files, fd, filename, flags, fmode)); | |
76 | ||
77 | LTTNG_DEFINE_TRACE(lttng_statedump_start, | |
8cdc1a81 | 78 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
79 | TP_ARGS(session)); |
80 | ||
81 | LTTNG_DEFINE_TRACE(lttng_statedump_process_state, | |
8cdc1a81 | 82 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
83 | struct task_struct *p, |
84 | int type, int mode, int submode, int status, | |
85 | struct files_struct *files), | |
86 | TP_ARGS(session, p, type, mode, submode, status, files)); | |
87 | ||
88 | LTTNG_DEFINE_TRACE(lttng_statedump_process_pid_ns, | |
8cdc1a81 | 89 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
90 | struct task_struct *p, |
91 | struct pid_namespace *pid_ns), | |
92 | TP_ARGS(session, p, pid_ns)); | |
93 | ||
5f4c791e | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
0116245f | 95 | LTTNG_DEFINE_TRACE(lttng_statedump_process_cgroup_ns, |
8cdc1a81 | 96 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
97 | struct task_struct *p, |
98 | struct cgroup_namespace *cgroup_ns), | |
99 | TP_ARGS(session, p, cgroup_ns)); | |
1965e6b4 | 100 | #endif |
0116245f MJ |
101 | |
102 | LTTNG_DEFINE_TRACE(lttng_statedump_process_ipc_ns, | |
8cdc1a81 | 103 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
104 | struct task_struct *p, |
105 | struct ipc_namespace *ipc_ns), | |
106 | TP_ARGS(session, p, ipc_ns)); | |
107 | ||
1965e6b4 | 108 | #ifndef LTTNG_MNT_NS_MISSING_HEADER |
0116245f | 109 | LTTNG_DEFINE_TRACE(lttng_statedump_process_mnt_ns, |
8cdc1a81 | 110 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
111 | struct task_struct *p, |
112 | struct mnt_namespace *mnt_ns), | |
113 | TP_ARGS(session, p, mnt_ns)); | |
1965e6b4 | 114 | #endif |
0116245f MJ |
115 | |
116 | LTTNG_DEFINE_TRACE(lttng_statedump_process_net_ns, | |
8cdc1a81 | 117 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
118 | struct task_struct *p, |
119 | struct net *net_ns), | |
120 | TP_ARGS(session, p, net_ns)); | |
121 | ||
122 | LTTNG_DEFINE_TRACE(lttng_statedump_process_user_ns, | |
8cdc1a81 | 123 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
124 | struct task_struct *p, |
125 | struct user_namespace *user_ns), | |
126 | TP_ARGS(session, p, user_ns)); | |
127 | ||
128 | LTTNG_DEFINE_TRACE(lttng_statedump_process_uts_ns, | |
8cdc1a81 | 129 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
130 | struct task_struct *p, |
131 | struct uts_namespace *uts_ns), | |
132 | TP_ARGS(session, p, uts_ns)); | |
133 | ||
134 | LTTNG_DEFINE_TRACE(lttng_statedump_process_time_ns, | |
8cdc1a81 | 135 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
136 | struct task_struct *p, |
137 | struct time_namespace *time_ns), | |
138 | TP_ARGS(session, p, time_ns)); | |
139 | ||
140 | LTTNG_DEFINE_TRACE(lttng_statedump_network_interface, | |
8cdc1a81 | 141 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
142 | struct net_device *dev, struct in_ifaddr *ifa), |
143 | TP_ARGS(session, dev, ifa)); | |
144 | ||
d0b55e4c | 145 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
0116245f | 146 | LTTNG_DEFINE_TRACE(lttng_statedump_cpu_topology, |
8cdc1a81 | 147 | TP_PROTO(struct lttng_kernel_session *session, struct cpuinfo_x86 *c), |
0116245f | 148 | TP_ARGS(session, c)); |
502e4132 | 149 | #endif |
20591cf7 | 150 | |
361c023a MD |
151 | struct lttng_fd_ctx { |
152 | char *page; | |
8cdc1a81 | 153 | struct lttng_kernel_session *session; |
d561ecfb | 154 | struct files_struct *files; |
361c023a MD |
155 | }; |
156 | ||
c337ddc2 MD |
157 | /* |
158 | * Protected by the trace lock. | |
159 | */ | |
160 | static struct delayed_work cpu_work[NR_CPUS]; | |
161 | static DECLARE_WAIT_QUEUE_HEAD(statedump_wq); | |
162 | static atomic_t kernel_threads_to_run; | |
163 | ||
164 | enum lttng_thread_type { | |
165 | LTTNG_USER_THREAD = 0, | |
166 | LTTNG_KERNEL_THREAD = 1, | |
167 | }; | |
168 | ||
169 | enum lttng_execution_mode { | |
170 | LTTNG_USER_MODE = 0, | |
171 | LTTNG_SYSCALL = 1, | |
172 | LTTNG_TRAP = 2, | |
173 | LTTNG_IRQ = 3, | |
174 | LTTNG_SOFTIRQ = 4, | |
175 | LTTNG_MODE_UNKNOWN = 5, | |
176 | }; | |
177 | ||
178 | enum lttng_execution_submode { | |
179 | LTTNG_NONE = 0, | |
180 | LTTNG_UNKNOWN = 1, | |
181 | }; | |
182 | ||
183 | enum lttng_process_status { | |
184 | LTTNG_UNNAMED = 0, | |
185 | LTTNG_WAIT_FORK = 1, | |
186 | LTTNG_WAIT_CPU = 2, | |
187 | LTTNG_EXIT = 3, | |
188 | LTTNG_ZOMBIE = 4, | |
189 | LTTNG_WAIT = 5, | |
190 | LTTNG_RUN = 6, | |
191 | LTTNG_DEAD = 7, | |
192 | }; | |
193 | ||
fef7fe6a | 194 | |
a9d49ac6 MH |
195 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,0,0) || \ |
196 | LTTNG_RHEL_KERNEL_RANGE(5,14,0,163,0,0, 5,15,0,0,0,0)) | |
cc92a211 MJ |
197 | |
198 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
199 | ||
200 | static | |
201 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
202 | { | |
203 | int ret; | |
204 | ||
205 | ret = snprintf(name_buf, BDEVNAME_SIZE, "%pg", part); | |
206 | if (ret < 0 || ret >= BDEVNAME_SIZE) | |
207 | return -ENOSYS; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static | |
213 | dev_t lttng_get_part_devt(struct block_device *part) | |
214 | { | |
215 | return part->bd_dev; | |
216 | } | |
217 | ||
218 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0)) | |
fef7fe6a MJ |
219 | |
220 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
221 | ||
222 | static | |
223 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
224 | { | |
225 | const char *p; | |
226 | ||
227 | p = bdevname(part, name_buf); | |
228 | if (!p) | |
229 | return -ENOSYS; | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static | |
235 | dev_t lttng_get_part_devt(struct block_device *part) | |
236 | { | |
237 | return part->bd_dev; | |
238 | } | |
239 | ||
240 | #else | |
241 | ||
242 | #define LTTNG_PART_STRUCT_TYPE struct hd_struct | |
243 | ||
244 | static | |
245 | int lttng_get_part_name(struct gendisk *disk, struct hd_struct *part, char *name_buf) | |
246 | { | |
247 | const char *p; | |
248 | struct block_device bdev; | |
249 | ||
250 | /* | |
251 | * Create a partial 'struct blockdevice' to use | |
252 | * 'bdevname()' which is a simple wrapper over | |
253 | * 'disk_name()' but has the honor to be EXPORT_SYMBOL. | |
254 | */ | |
255 | bdev.bd_disk = disk; | |
256 | bdev.bd_part = part; | |
257 | ||
258 | p = bdevname(&bdev, name_buf); | |
259 | if (!p) | |
260 | return -ENOSYS; | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static | |
266 | dev_t lttng_get_part_devt(struct hd_struct *part) | |
267 | { | |
268 | return part_devt(part); | |
269 | } | |
270 | #endif | |
271 | ||
481fd2a2 MJ |
272 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0)) |
273 | static | |
274 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
275 | { | |
276 | struct block_device *part; | |
277 | unsigned long idx; | |
278 | int ret = 0; | |
279 | ||
280 | /* Include partition 0 */ | |
281 | idx = 0; | |
282 | ||
283 | rcu_read_lock(); | |
284 | xa_for_each(&disk->part_tbl, idx, part) { | |
285 | char name_buf[BDEVNAME_SIZE]; | |
286 | ||
287 | /* Exclude non-partitions bdev and empty partitions. */ | |
288 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) | |
289 | continue; | |
290 | ||
291 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
292 | ret = -ENOSYS; | |
293 | goto end; | |
294 | } | |
295 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
296 | name_buf); | |
297 | } | |
298 | end: | |
299 | rcu_read_unlock(); | |
300 | return ret; | |
301 | } | |
302 | #else | |
303 | static | |
304 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
305 | { | |
306 | struct disk_part_iter piter; | |
307 | LTTNG_PART_STRUCT_TYPE *part; | |
308 | ||
309 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
310 | ||
311 | while ((part = disk_part_iter_next(&piter))) { | |
312 | char name_buf[BDEVNAME_SIZE]; | |
313 | ||
314 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
315 | disk_part_iter_exit(&piter); | |
316 | return -ENOSYS; | |
317 | } | |
318 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
319 | name_buf); | |
320 | } | |
321 | disk_part_iter_exit(&piter); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | #endif | |
326 | ||
f0dbdefb | 327 | static |
8cdc1a81 | 328 | int lttng_enumerate_block_devices(struct lttng_kernel_session *session) |
f0dbdefb HD |
329 | { |
330 | struct class *ptr_block_class; | |
331 | struct device_type *ptr_disk_type; | |
332 | struct class_dev_iter iter; | |
333 | struct device *dev; | |
7633c773 | 334 | int ret = 0; |
f0dbdefb HD |
335 | |
336 | ptr_block_class = wrapper_get_block_class(); | |
7633c773 MJ |
337 | if (!ptr_block_class) { |
338 | ret = -ENOSYS; | |
339 | goto end; | |
340 | } | |
f0dbdefb HD |
341 | ptr_disk_type = wrapper_get_disk_type(); |
342 | if (!ptr_disk_type) { | |
7633c773 MJ |
343 | ret = -ENOSYS; |
344 | goto end; | |
f0dbdefb HD |
345 | } |
346 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
347 | while ((dev = class_dev_iter_next(&iter))) { | |
f0dbdefb | 348 | struct gendisk *disk = dev_to_disk(dev); |
f0dbdefb | 349 | |
5a91f3df MD |
350 | /* |
351 | * Don't show empty devices or things that have been | |
352 | * suppressed | |
353 | */ | |
354 | if (get_capacity(disk) == 0 || | |
fe72ab45 | 355 | (disk->flags & LTTNG_GENHD_FL_HIDDEN)) |
5a91f3df MD |
356 | continue; |
357 | ||
481fd2a2 | 358 | ret = lttng_statedump_each_block_device(session, disk); |
f0dbdefb HD |
359 | } |
360 | class_dev_iter_exit(&iter); | |
7633c773 MJ |
361 | end: |
362 | return ret; | |
f0dbdefb HD |
363 | } |
364 | ||
c337ddc2 | 365 | #ifdef CONFIG_INET |
f0dbdefb | 366 | |
c337ddc2 | 367 | static |
8cdc1a81 | 368 | void lttng_enumerate_device(struct lttng_kernel_session *session, |
c337ddc2 MD |
369 | struct net_device *dev) |
370 | { | |
371 | struct in_device *in_dev; | |
372 | struct in_ifaddr *ifa; | |
373 | ||
374 | if (dev->flags & IFF_UP) { | |
375 | in_dev = in_dev_get(dev); | |
376 | if (in_dev) { | |
377 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
378 | ifa = ifa->ifa_next) { | |
379 | trace_lttng_statedump_network_interface( | |
380 | session, dev, ifa); | |
381 | } | |
382 | in_dev_put(in_dev); | |
383 | } | |
384 | } else { | |
385 | trace_lttng_statedump_network_interface( | |
386 | session, dev, NULL); | |
387 | } | |
388 | } | |
389 | ||
217bc2e4 KS |
390 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) |
391 | static | |
392 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) | |
393 | { | |
394 | struct net_device *dev; | |
395 | ||
396 | rtnl_lock(); | |
397 | for_each_netdev(&init_net, dev) | |
398 | lttng_enumerate_device(session, dev); | |
399 | rtnl_unlock(); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | #else | |
c337ddc2 | 404 | static |
8cdc1a81 | 405 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
406 | { |
407 | struct net_device *dev; | |
408 | ||
409 | read_lock(&dev_base_lock); | |
410 | for_each_netdev(&init_net, dev) | |
411 | lttng_enumerate_device(session, dev); | |
412 | read_unlock(&dev_base_lock); | |
413 | ||
414 | return 0; | |
415 | } | |
217bc2e4 | 416 | #endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,9,0)) */ |
c337ddc2 MD |
417 | #else /* CONFIG_INET */ |
418 | static inline | |
8cdc1a81 | 419 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
420 | { |
421 | return 0; | |
422 | } | |
423 | #endif /* CONFIG_INET */ | |
424 | ||
361c023a MD |
425 | static |
426 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
427 | { | |
428 | const struct lttng_fd_ctx *ctx = p; | |
429 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 430 | unsigned int flags = file->f_flags; |
d561ecfb | 431 | struct fdtable *fdt; |
361c023a | 432 | |
29021503 MD |
433 | /* |
434 | * We don't expose kernel internal flags, only userspace-visible | |
435 | * flags. | |
436 | */ | |
437 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
438 | fdt = files_fdtable(ctx->files); |
439 | /* | |
440 | * We need to check here again whether fd is within the fdt | |
441 | * max_fds range, because we might be seeing a different | |
442 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
443 | * protecting the read. In reality, iterate_fd() holds | |
444 | * file_lock, which should ensure the fdt does not change while | |
445 | * the lock is taken, but we are not aware whether this is | |
446 | * guaranteed or not, so play safe. | |
447 | */ | |
1cbe11ed | 448 | if (fd < fdt->max_fds && close_on_exec(fd, fdt)) |
29021503 | 449 | flags |= O_CLOEXEC; |
361c023a MD |
450 | if (IS_ERR(s)) { |
451 | struct dentry *dentry = file->f_path.dentry; | |
452 | ||
453 | /* Make sure we give at least some info */ | |
454 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
455 | trace_lttng_statedump_file_descriptor(ctx->session, |
456 | ctx->files, fd, dentry->d_name.name, flags, | |
457 | file->f_mode); | |
361c023a MD |
458 | spin_unlock(&dentry->d_lock); |
459 | goto end; | |
460 | } | |
e7a0ca72 MD |
461 | trace_lttng_statedump_file_descriptor(ctx->session, |
462 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
463 | end: |
464 | return 0; | |
465 | } | |
c337ddc2 | 466 | |
e7a0ca72 | 467 | /* Called with task lock held. */ |
c337ddc2 | 468 | static |
8cdc1a81 | 469 | void lttng_enumerate_files(struct lttng_kernel_session *session, |
e7a0ca72 MD |
470 | struct files_struct *files, |
471 | char *tmp) | |
c337ddc2 | 472 | { |
e7a0ca72 | 473 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 474 | |
1cbe11ed | 475 | iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
476 | } |
477 | ||
d0b55e4c | 478 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 | 479 | static |
8cdc1a81 | 480 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
481 | { |
482 | int cpu; | |
483 | const cpumask_t *cpumask = cpu_possible_mask; | |
484 | ||
485 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
486 | cpu = cpumask_next(cpu, cpumask)) { | |
487 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
492 | #else | |
493 | static | |
8cdc1a81 | 494 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
495 | { |
496 | return 0; | |
497 | } | |
498 | #endif | |
499 | ||
0658bdda MD |
500 | #if 0 |
501 | /* | |
502 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
503 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
504 | * iteration, but it is not exported to modules. | |
505 | */ | |
c337ddc2 | 506 | static |
8cdc1a81 | 507 | void lttng_enumerate_task_vm_maps(struct lttng_kernel_session *session, |
c337ddc2 MD |
508 | struct task_struct *p) |
509 | { | |
510 | struct mm_struct *mm; | |
511 | struct vm_area_struct *map; | |
512 | unsigned long ino; | |
513 | ||
514 | /* get_task_mm does a task_lock... */ | |
515 | mm = get_task_mm(p); | |
516 | if (!mm) | |
517 | return; | |
518 | ||
519 | map = mm->mmap; | |
520 | if (map) { | |
521 | down_read(&mm->mmap_sem); | |
522 | while (map) { | |
523 | if (map->vm_file) | |
2a059b14 | 524 | ino = map->vm_file->f_path.dentry->d_inode->i_ino; |
c337ddc2 MD |
525 | else |
526 | ino = 0; | |
527 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
528 | map = map->vm_next; | |
529 | } | |
530 | up_read(&mm->mmap_sem); | |
531 | } | |
532 | mmput(mm); | |
533 | } | |
534 | ||
535 | static | |
8cdc1a81 | 536 | int lttng_enumerate_vm_maps(struct lttng_kernel_session *session) |
c337ddc2 MD |
537 | { |
538 | struct task_struct *p; | |
539 | ||
540 | rcu_read_lock(); | |
541 | for_each_process(p) | |
542 | lttng_enumerate_task_vm_maps(session, p); | |
543 | rcu_read_unlock(); | |
544 | return 0; | |
545 | } | |
0658bdda | 546 | #endif |
c337ddc2 | 547 | |
c337ddc2 | 548 | static |
8cdc1a81 | 549 | int lttng_list_interrupts(struct lttng_kernel_session *session) |
c337ddc2 MD |
550 | { |
551 | unsigned int irq; | |
552 | unsigned long flags = 0; | |
553 | struct irq_desc *desc; | |
554 | ||
555 | #define irq_to_desc wrapper_irq_to_desc | |
556 | /* needs irq_desc */ | |
557 | for_each_irq_desc(irq, desc) { | |
558 | struct irqaction *action; | |
559 | const char *irq_chip_name = | |
560 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
561 | ||
562 | local_irq_save(flags); | |
fc94c945 | 563 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
564 | for (action = desc->action; action; action = action->next) { |
565 | trace_lttng_statedump_interrupt(session, | |
566 | irq, irq_chip_name, action); | |
567 | } | |
fc94c945 | 568 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
569 | local_irq_restore(flags); |
570 | } | |
cfcee1c7 | 571 | return 0; |
c337ddc2 MD |
572 | #undef irq_to_desc |
573 | } | |
c337ddc2 | 574 | |
4ba1f53c | 575 | /* |
1965e6b4 MJ |
576 | * Statedump the task's namespaces using the proc filesystem inode number as |
577 | * the unique identifier. The user and pid ns are nested and will be dumped | |
578 | * recursively. | |
579 | * | |
4ba1f53c MD |
580 | * Called with task lock held. |
581 | */ | |
73e8ba37 | 582 | static |
8cdc1a81 | 583 | void lttng_statedump_process_ns(struct lttng_kernel_session *session, |
73e8ba37 JD |
584 | struct task_struct *p, |
585 | enum lttng_thread_type type, | |
586 | enum lttng_execution_mode mode, | |
587 | enum lttng_execution_submode submode, | |
588 | enum lttng_process_status status) | |
589 | { | |
1965e6b4 | 590 | struct nsproxy *proxy; |
73e8ba37 | 591 | struct pid_namespace *pid_ns; |
1965e6b4 | 592 | struct user_namespace *user_ns; |
73e8ba37 | 593 | |
1965e6b4 MJ |
594 | /* |
595 | * The pid and user namespaces are special, they are nested and | |
596 | * accessed with specific functions instead of the nsproxy struct | |
597 | * like the other namespaces. | |
598 | */ | |
887bcdac MJ |
599 | pid_ns = task_active_pid_ns(p); |
600 | do { | |
1965e6b4 | 601 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 602 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 603 | } while (pid_ns); |
1965e6b4 MJ |
604 | |
605 | ||
606 | user_ns = task_cred_xxx(p, user_ns); | |
607 | do { | |
608 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
609 | /* |
610 | * trace_lttng_statedump_process_user_ns() internally | |
611 | * checks whether user_ns is NULL. While this does not | |
612 | * appear to be a possible return value for | |
613 | * task_cred_xxx(), err on the safe side and check | |
614 | * for NULL here as well to be consistent with the | |
615 | * paranoid behavior of | |
616 | * trace_lttng_statedump_process_user_ns(). | |
617 | */ | |
93e5bcec | 618 | user_ns = user_ns ? user_ns->parent : NULL; |
1965e6b4 MJ |
619 | } while (user_ns); |
620 | ||
1965e6b4 | 621 | proxy = p->nsproxy; |
7724cf27 | 622 | |
1965e6b4 | 623 | if (proxy) { |
5f4c791e | 624 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
1965e6b4 MJ |
625 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); |
626 | #endif | |
627 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
628 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
629 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
630 | #endif | |
631 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
632 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
fce87a6e MJ |
633 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \ |
634 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0)) | |
876e2e92 MJ |
635 | trace_lttng_statedump_process_time_ns(session, p, proxy->time_ns); |
636 | #endif | |
1965e6b4 | 637 | } |
73e8ba37 JD |
638 | } |
639 | ||
c337ddc2 | 640 | static |
8cdc1a81 | 641 | int lttng_enumerate_process_states(struct lttng_kernel_session *session) |
c337ddc2 MD |
642 | { |
643 | struct task_struct *g, *p; | |
e7a0ca72 MD |
644 | char *tmp; |
645 | ||
646 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
647 | if (!tmp) | |
648 | return -ENOMEM; | |
c337ddc2 MD |
649 | |
650 | rcu_read_lock(); | |
651 | for_each_process(g) { | |
e7a0ca72 MD |
652 | struct files_struct *prev_files = NULL; |
653 | ||
c337ddc2 MD |
654 | p = g; |
655 | do { | |
656 | enum lttng_execution_mode mode = | |
657 | LTTNG_MODE_UNKNOWN; | |
658 | enum lttng_execution_submode submode = | |
659 | LTTNG_UNKNOWN; | |
660 | enum lttng_process_status status; | |
661 | enum lttng_thread_type type; | |
e7a0ca72 | 662 | struct files_struct *files; |
c337ddc2 MD |
663 | |
664 | task_lock(p); | |
665 | if (p->exit_state == EXIT_ZOMBIE) | |
666 | status = LTTNG_ZOMBIE; | |
667 | else if (p->exit_state == EXIT_DEAD) | |
668 | status = LTTNG_DEAD; | |
7259e6a5 | 669 | else if (lttng_task_is_running(p)) { |
c337ddc2 MD |
670 | /* Is this a forked child that has not run yet? */ |
671 | if (list_empty(&p->rt.run_list)) | |
672 | status = LTTNG_WAIT_FORK; | |
673 | else | |
674 | /* | |
675 | * All tasks are considered as wait_cpu; | |
676 | * the viewer will sort out if the task | |
677 | * was really running at this time. | |
678 | */ | |
679 | status = LTTNG_WAIT_CPU; | |
7259e6a5 | 680 | } else if (lttng_get_task_state(p) & |
c337ddc2 MD |
681 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { |
682 | /* Task is waiting for something to complete */ | |
683 | status = LTTNG_WAIT; | |
684 | } else | |
685 | status = LTTNG_UNNAMED; | |
686 | submode = LTTNG_NONE; | |
687 | ||
688 | /* | |
689 | * Verification of t->mm is to filter out kernel | |
690 | * threads; Viewer will further filter out if a | |
691 | * user-space thread was in syscall mode or not. | |
692 | */ | |
693 | if (p->mm) | |
694 | type = LTTNG_USER_THREAD; | |
695 | else | |
696 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 697 | files = p->files; |
d2a927ac MJ |
698 | |
699 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 700 | p, type, mode, submode, status, files); |
73e8ba37 | 701 | lttng_statedump_process_ns(session, |
c337ddc2 | 702 | p, type, mode, submode, status); |
e7a0ca72 MD |
703 | /* |
704 | * As an optimisation for the common case, do not | |
705 | * repeat information for the same files_struct in | |
706 | * two consecutive threads. This is the common case | |
707 | * for threads sharing the same fd table. RCU guarantees | |
708 | * that the same files_struct pointer is not re-used | |
709 | * throughout processes/threads iteration. | |
710 | */ | |
711 | if (files && files != prev_files) { | |
712 | lttng_enumerate_files(session, files, tmp); | |
713 | prev_files = files; | |
714 | } | |
c337ddc2 MD |
715 | task_unlock(p); |
716 | } while_each_thread(g, p); | |
717 | } | |
718 | rcu_read_unlock(); | |
719 | ||
e7a0ca72 MD |
720 | free_page((unsigned long) tmp); |
721 | ||
c337ddc2 MD |
722 | return 0; |
723 | } | |
724 | ||
725 | static | |
726 | void lttng_statedump_work_func(struct work_struct *work) | |
727 | { | |
728 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
729 | /* If we are the last thread, wake up do_lttng_statedump */ | |
730 | wake_up(&statedump_wq); | |
731 | } | |
732 | ||
733 | static | |
8cdc1a81 | 734 | int do_lttng_statedump(struct lttng_kernel_session *session) |
c337ddc2 | 735 | { |
cfcee1c7 | 736 | int cpu, ret; |
c337ddc2 | 737 | |
c337ddc2 | 738 | trace_lttng_statedump_start(session); |
cfcee1c7 | 739 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
740 | if (ret) |
741 | return ret; | |
742 | /* | |
743 | * FIXME | |
744 | * ret = lttng_enumerate_vm_maps(session); | |
745 | * if (ret) | |
746 | * return ret; | |
747 | */ | |
748 | ret = lttng_list_interrupts(session); | |
749 | if (ret) | |
750 | return ret; | |
751 | ret = lttng_enumerate_network_ip_interface(session); | |
752 | if (ret) | |
753 | return ret; | |
754 | ret = lttng_enumerate_block_devices(session); | |
755 | switch (ret) { | |
84c7055e MD |
756 | case 0: |
757 | break; | |
cfcee1c7 MD |
758 | case -ENOSYS: |
759 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
760 | break; | |
761 | default: | |
762 | return ret; | |
763 | } | |
502e4132 JD |
764 | ret = lttng_enumerate_cpu_topology(session); |
765 | if (ret) | |
766 | return ret; | |
c337ddc2 MD |
767 | |
768 | /* TODO lttng_dump_idt_table(session); */ | |
769 | /* TODO lttng_dump_softirq_vec(session); */ | |
770 | /* TODO lttng_list_modules(session); */ | |
771 | /* TODO lttng_dump_swap_files(session); */ | |
772 | ||
773 | /* | |
774 | * Fire off a work queue on each CPU. Their sole purpose in life | |
775 | * is to guarantee that each CPU has been in a state where is was in | |
776 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
777 | */ | |
ffcc8734 | 778 | lttng_cpus_read_lock(); |
c337ddc2 MD |
779 | atomic_set(&kernel_threads_to_run, num_online_cpus()); |
780 | for_each_online_cpu(cpu) { | |
781 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
782 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
783 | } | |
784 | /* Wait for all threads to run */ | |
7a7128e0 | 785 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
ffcc8734 | 786 | lttng_cpus_read_unlock(); |
c337ddc2 | 787 | /* Our work is done */ |
c337ddc2 MD |
788 | trace_lttng_statedump_end(session); |
789 | return 0; | |
790 | } | |
791 | ||
792 | /* | |
793 | * Called with session mutex held. | |
794 | */ | |
8cdc1a81 | 795 | int lttng_statedump_start(struct lttng_kernel_session *session) |
c337ddc2 | 796 | { |
c337ddc2 MD |
797 | return do_lttng_statedump(session); |
798 | } | |
799 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
800 | ||
dd8d5afb MD |
801 | static |
802 | int __init lttng_statedump_init(void) | |
803 | { | |
d16aa9c9 | 804 | return 0; |
dd8d5afb MD |
805 | } |
806 | ||
807 | module_init(lttng_statedump_init); | |
808 | ||
461277e7 MD |
809 | static |
810 | void __exit lttng_statedump_exit(void) | |
811 | { | |
812 | } | |
813 | ||
814 | module_exit(lttng_statedump_exit); | |
815 | ||
c337ddc2 MD |
816 | MODULE_LICENSE("GPL and additional rights"); |
817 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 818 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
819 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
820 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
821 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
822 | LTTNG_MODULES_EXTRAVERSION); |