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> | |
25 | #include <linux/irqnr.h> | |
c337ddc2 MD |
26 | #include <linux/netdevice.h> |
27 | #include <linux/inetdevice.h> | |
c337ddc2 | 28 | #include <linux/mm.h> |
c337ddc2 MD |
29 | #include <linux/swap.h> |
30 | #include <linux/wait.h> | |
31 | #include <linux/mutex.h> | |
f0dbdefb | 32 | #include <linux/device.h> |
c337ddc2 | 33 | |
5677d2e5 MJ |
34 | #include <linux/blkdev.h> |
35 | ||
2df37e95 MD |
36 | #include <lttng/events.h> |
37 | #include <lttng/tracer.h> | |
ffcc8734 | 38 | #include <wrapper/cpu.h> |
241ae9a8 | 39 | #include <wrapper/irqdesc.h> |
241ae9a8 | 40 | #include <wrapper/fdtable.h> |
1965e6b4 | 41 | #include <wrapper/namespace.h> |
241ae9a8 MD |
42 | #include <wrapper/irq.h> |
43 | #include <wrapper/tracepoint.h> | |
82fbf9d3 | 44 | #include <wrapper/blkdev.h> |
241ae9a8 | 45 | #include <wrapper/file.h> |
c07dca48 | 46 | #include <wrapper/fdtable.h> |
7259e6a5 | 47 | #include <wrapper/sched.h> |
c337ddc2 | 48 | |
29784493 | 49 | #ifdef CONFIG_LTTNG_HAS_LIST_IRQ |
c337ddc2 MD |
50 | #include <linux/irq.h> |
51 | #endif | |
52 | ||
53 | /* Define the tracepoints, but do not build the probes */ | |
54 | #define CREATE_TRACE_POINTS | |
4f47ccf0 | 55 | #define TRACE_INCLUDE_PATH instrumentation/events |
c337ddc2 | 56 | #define TRACE_INCLUDE_FILE lttng-statedump |
3bc29f0a | 57 | #define LTTNG_INSTRUMENTATION |
4f47ccf0 | 58 | #include <instrumentation/events/lttng-statedump.h> |
c337ddc2 | 59 | |
0116245f | 60 | LTTNG_DEFINE_TRACE(lttng_statedump_block_device, |
8cdc1a81 | 61 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
62 | dev_t dev, const char *diskname), |
63 | TP_ARGS(session, dev, diskname)); | |
64 | ||
65 | LTTNG_DEFINE_TRACE(lttng_statedump_end, | |
8cdc1a81 | 66 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
67 | TP_ARGS(session)); |
68 | ||
69 | LTTNG_DEFINE_TRACE(lttng_statedump_interrupt, | |
8cdc1a81 | 70 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
71 | unsigned int irq, const char *chip_name, |
72 | struct irqaction *action), | |
73 | TP_ARGS(session, irq, chip_name, action)); | |
74 | ||
75 | LTTNG_DEFINE_TRACE(lttng_statedump_file_descriptor, | |
8cdc1a81 | 76 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
77 | struct files_struct *files, |
78 | int fd, const char *filename, | |
79 | unsigned int flags, fmode_t fmode), | |
80 | TP_ARGS(session, files, fd, filename, flags, fmode)); | |
81 | ||
82 | LTTNG_DEFINE_TRACE(lttng_statedump_start, | |
8cdc1a81 | 83 | TP_PROTO(struct lttng_kernel_session *session), |
0116245f MJ |
84 | TP_ARGS(session)); |
85 | ||
86 | LTTNG_DEFINE_TRACE(lttng_statedump_process_state, | |
8cdc1a81 | 87 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
88 | struct task_struct *p, |
89 | int type, int mode, int submode, int status, | |
90 | struct files_struct *files), | |
91 | TP_ARGS(session, p, type, mode, submode, status, files)); | |
92 | ||
93 | LTTNG_DEFINE_TRACE(lttng_statedump_process_pid_ns, | |
8cdc1a81 | 94 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
95 | struct task_struct *p, |
96 | struct pid_namespace *pid_ns), | |
97 | TP_ARGS(session, p, pid_ns)); | |
98 | ||
5f4c791e | 99 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
0116245f | 100 | LTTNG_DEFINE_TRACE(lttng_statedump_process_cgroup_ns, |
8cdc1a81 | 101 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
102 | struct task_struct *p, |
103 | struct cgroup_namespace *cgroup_ns), | |
104 | TP_ARGS(session, p, cgroup_ns)); | |
1965e6b4 | 105 | #endif |
0116245f MJ |
106 | |
107 | LTTNG_DEFINE_TRACE(lttng_statedump_process_ipc_ns, | |
8cdc1a81 | 108 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
109 | struct task_struct *p, |
110 | struct ipc_namespace *ipc_ns), | |
111 | TP_ARGS(session, p, ipc_ns)); | |
112 | ||
1965e6b4 | 113 | #ifndef LTTNG_MNT_NS_MISSING_HEADER |
0116245f | 114 | LTTNG_DEFINE_TRACE(lttng_statedump_process_mnt_ns, |
8cdc1a81 | 115 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
116 | struct task_struct *p, |
117 | struct mnt_namespace *mnt_ns), | |
118 | TP_ARGS(session, p, mnt_ns)); | |
1965e6b4 | 119 | #endif |
0116245f MJ |
120 | |
121 | LTTNG_DEFINE_TRACE(lttng_statedump_process_net_ns, | |
8cdc1a81 | 122 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
123 | struct task_struct *p, |
124 | struct net *net_ns), | |
125 | TP_ARGS(session, p, net_ns)); | |
126 | ||
127 | LTTNG_DEFINE_TRACE(lttng_statedump_process_user_ns, | |
8cdc1a81 | 128 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
129 | struct task_struct *p, |
130 | struct user_namespace *user_ns), | |
131 | TP_ARGS(session, p, user_ns)); | |
132 | ||
133 | LTTNG_DEFINE_TRACE(lttng_statedump_process_uts_ns, | |
8cdc1a81 | 134 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
135 | struct task_struct *p, |
136 | struct uts_namespace *uts_ns), | |
137 | TP_ARGS(session, p, uts_ns)); | |
138 | ||
139 | LTTNG_DEFINE_TRACE(lttng_statedump_process_time_ns, | |
8cdc1a81 | 140 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
141 | struct task_struct *p, |
142 | struct time_namespace *time_ns), | |
143 | TP_ARGS(session, p, time_ns)); | |
144 | ||
145 | LTTNG_DEFINE_TRACE(lttng_statedump_network_interface, | |
8cdc1a81 | 146 | TP_PROTO(struct lttng_kernel_session *session, |
0116245f MJ |
147 | struct net_device *dev, struct in_ifaddr *ifa), |
148 | TP_ARGS(session, dev, ifa)); | |
149 | ||
d0b55e4c | 150 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
0116245f | 151 | LTTNG_DEFINE_TRACE(lttng_statedump_cpu_topology, |
8cdc1a81 | 152 | TP_PROTO(struct lttng_kernel_session *session, struct cpuinfo_x86 *c), |
0116245f | 153 | TP_ARGS(session, c)); |
502e4132 | 154 | #endif |
20591cf7 | 155 | |
361c023a MD |
156 | struct lttng_fd_ctx { |
157 | char *page; | |
8cdc1a81 | 158 | struct lttng_kernel_session *session; |
d561ecfb | 159 | struct files_struct *files; |
361c023a MD |
160 | }; |
161 | ||
c337ddc2 MD |
162 | /* |
163 | * Protected by the trace lock. | |
164 | */ | |
165 | static struct delayed_work cpu_work[NR_CPUS]; | |
166 | static DECLARE_WAIT_QUEUE_HEAD(statedump_wq); | |
167 | static atomic_t kernel_threads_to_run; | |
168 | ||
169 | enum lttng_thread_type { | |
170 | LTTNG_USER_THREAD = 0, | |
171 | LTTNG_KERNEL_THREAD = 1, | |
172 | }; | |
173 | ||
174 | enum lttng_execution_mode { | |
175 | LTTNG_USER_MODE = 0, | |
176 | LTTNG_SYSCALL = 1, | |
177 | LTTNG_TRAP = 2, | |
178 | LTTNG_IRQ = 3, | |
179 | LTTNG_SOFTIRQ = 4, | |
180 | LTTNG_MODE_UNKNOWN = 5, | |
181 | }; | |
182 | ||
183 | enum lttng_execution_submode { | |
184 | LTTNG_NONE = 0, | |
185 | LTTNG_UNKNOWN = 1, | |
186 | }; | |
187 | ||
188 | enum lttng_process_status { | |
189 | LTTNG_UNNAMED = 0, | |
190 | LTTNG_WAIT_FORK = 1, | |
191 | LTTNG_WAIT_CPU = 2, | |
192 | LTTNG_EXIT = 3, | |
193 | LTTNG_ZOMBIE = 4, | |
194 | LTTNG_WAIT = 5, | |
195 | LTTNG_RUN = 6, | |
196 | LTTNG_DEAD = 7, | |
197 | }; | |
198 | ||
fef7fe6a | 199 | |
5f4c791e | 200 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0)) |
fef7fe6a MJ |
201 | |
202 | #define LTTNG_PART_STRUCT_TYPE struct block_device | |
203 | ||
204 | static | |
205 | int lttng_get_part_name(struct gendisk *disk, struct block_device *part, char *name_buf) | |
206 | { | |
207 | const char *p; | |
208 | ||
209 | p = bdevname(part, name_buf); | |
210 | if (!p) | |
211 | return -ENOSYS; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static | |
217 | dev_t lttng_get_part_devt(struct block_device *part) | |
218 | { | |
219 | return part->bd_dev; | |
220 | } | |
221 | ||
222 | #else | |
223 | ||
224 | #define LTTNG_PART_STRUCT_TYPE struct hd_struct | |
225 | ||
226 | static | |
227 | int lttng_get_part_name(struct gendisk *disk, struct hd_struct *part, char *name_buf) | |
228 | { | |
229 | const char *p; | |
230 | struct block_device bdev; | |
231 | ||
232 | /* | |
233 | * Create a partial 'struct blockdevice' to use | |
234 | * 'bdevname()' which is a simple wrapper over | |
235 | * 'disk_name()' but has the honor to be EXPORT_SYMBOL. | |
236 | */ | |
237 | bdev.bd_disk = disk; | |
238 | bdev.bd_part = part; | |
239 | ||
240 | p = bdevname(&bdev, name_buf); | |
241 | if (!p) | |
242 | return -ENOSYS; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static | |
248 | dev_t lttng_get_part_devt(struct hd_struct *part) | |
249 | { | |
250 | return part_devt(part); | |
251 | } | |
252 | #endif | |
253 | ||
481fd2a2 MJ |
254 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0)) |
255 | static | |
256 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
257 | { | |
258 | struct block_device *part; | |
259 | unsigned long idx; | |
260 | int ret = 0; | |
261 | ||
262 | /* Include partition 0 */ | |
263 | idx = 0; | |
264 | ||
265 | rcu_read_lock(); | |
266 | xa_for_each(&disk->part_tbl, idx, part) { | |
267 | char name_buf[BDEVNAME_SIZE]; | |
268 | ||
269 | /* Exclude non-partitions bdev and empty partitions. */ | |
270 | if (bdev_is_partition(part) && !bdev_nr_sectors(part)) | |
271 | continue; | |
272 | ||
273 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
274 | ret = -ENOSYS; | |
275 | goto end; | |
276 | } | |
277 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
278 | name_buf); | |
279 | } | |
280 | end: | |
281 | rcu_read_unlock(); | |
282 | return ret; | |
283 | } | |
284 | #else | |
285 | static | |
286 | int lttng_statedump_each_block_device(struct lttng_kernel_session *session, struct gendisk *disk) | |
287 | { | |
288 | struct disk_part_iter piter; | |
289 | LTTNG_PART_STRUCT_TYPE *part; | |
290 | ||
291 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
292 | ||
293 | while ((part = disk_part_iter_next(&piter))) { | |
294 | char name_buf[BDEVNAME_SIZE]; | |
295 | ||
296 | if (lttng_get_part_name(disk, part, name_buf) == -ENOSYS) { | |
297 | disk_part_iter_exit(&piter); | |
298 | return -ENOSYS; | |
299 | } | |
300 | trace_lttng_statedump_block_device(session, lttng_get_part_devt(part), | |
301 | name_buf); | |
302 | } | |
303 | disk_part_iter_exit(&piter); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | #endif | |
308 | ||
f0dbdefb | 309 | static |
8cdc1a81 | 310 | int lttng_enumerate_block_devices(struct lttng_kernel_session *session) |
f0dbdefb HD |
311 | { |
312 | struct class *ptr_block_class; | |
313 | struct device_type *ptr_disk_type; | |
314 | struct class_dev_iter iter; | |
315 | struct device *dev; | |
7633c773 | 316 | int ret = 0; |
f0dbdefb HD |
317 | |
318 | ptr_block_class = wrapper_get_block_class(); | |
7633c773 MJ |
319 | if (!ptr_block_class) { |
320 | ret = -ENOSYS; | |
321 | goto end; | |
322 | } | |
f0dbdefb HD |
323 | ptr_disk_type = wrapper_get_disk_type(); |
324 | if (!ptr_disk_type) { | |
7633c773 MJ |
325 | ret = -ENOSYS; |
326 | goto end; | |
f0dbdefb HD |
327 | } |
328 | class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type); | |
329 | while ((dev = class_dev_iter_next(&iter))) { | |
f0dbdefb | 330 | struct gendisk *disk = dev_to_disk(dev); |
f0dbdefb | 331 | |
5a91f3df MD |
332 | /* |
333 | * Don't show empty devices or things that have been | |
334 | * suppressed | |
335 | */ | |
336 | if (get_capacity(disk) == 0 || | |
fe72ab45 | 337 | (disk->flags & LTTNG_GENHD_FL_HIDDEN)) |
5a91f3df MD |
338 | continue; |
339 | ||
481fd2a2 | 340 | ret = lttng_statedump_each_block_device(session, disk); |
f0dbdefb HD |
341 | } |
342 | class_dev_iter_exit(&iter); | |
7633c773 MJ |
343 | end: |
344 | return ret; | |
f0dbdefb HD |
345 | } |
346 | ||
c337ddc2 | 347 | #ifdef CONFIG_INET |
f0dbdefb | 348 | |
c337ddc2 | 349 | static |
8cdc1a81 | 350 | void lttng_enumerate_device(struct lttng_kernel_session *session, |
c337ddc2 MD |
351 | struct net_device *dev) |
352 | { | |
353 | struct in_device *in_dev; | |
354 | struct in_ifaddr *ifa; | |
355 | ||
356 | if (dev->flags & IFF_UP) { | |
357 | in_dev = in_dev_get(dev); | |
358 | if (in_dev) { | |
359 | for (ifa = in_dev->ifa_list; ifa != NULL; | |
360 | ifa = ifa->ifa_next) { | |
361 | trace_lttng_statedump_network_interface( | |
362 | session, dev, ifa); | |
363 | } | |
364 | in_dev_put(in_dev); | |
365 | } | |
366 | } else { | |
367 | trace_lttng_statedump_network_interface( | |
368 | session, dev, NULL); | |
369 | } | |
370 | } | |
371 | ||
372 | static | |
8cdc1a81 | 373 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
374 | { |
375 | struct net_device *dev; | |
376 | ||
377 | read_lock(&dev_base_lock); | |
378 | for_each_netdev(&init_net, dev) | |
379 | lttng_enumerate_device(session, dev); | |
380 | read_unlock(&dev_base_lock); | |
381 | ||
382 | return 0; | |
383 | } | |
384 | #else /* CONFIG_INET */ | |
385 | static inline | |
8cdc1a81 | 386 | int lttng_enumerate_network_ip_interface(struct lttng_kernel_session *session) |
c337ddc2 MD |
387 | { |
388 | return 0; | |
389 | } | |
390 | #endif /* CONFIG_INET */ | |
391 | ||
361c023a MD |
392 | static |
393 | int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd) | |
394 | { | |
395 | const struct lttng_fd_ctx *ctx = p; | |
396 | const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE); | |
29021503 | 397 | unsigned int flags = file->f_flags; |
d561ecfb | 398 | struct fdtable *fdt; |
361c023a | 399 | |
29021503 MD |
400 | /* |
401 | * We don't expose kernel internal flags, only userspace-visible | |
402 | * flags. | |
403 | */ | |
404 | flags &= ~FMODE_NONOTIFY; | |
d561ecfb MD |
405 | fdt = files_fdtable(ctx->files); |
406 | /* | |
407 | * We need to check here again whether fd is within the fdt | |
408 | * max_fds range, because we might be seeing a different | |
409 | * files_fdtable() than iterate_fd(), assuming only RCU is | |
410 | * protecting the read. In reality, iterate_fd() holds | |
411 | * file_lock, which should ensure the fdt does not change while | |
412 | * the lock is taken, but we are not aware whether this is | |
413 | * guaranteed or not, so play safe. | |
414 | */ | |
aa29f2d3 | 415 | if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt)) |
29021503 | 416 | flags |= O_CLOEXEC; |
361c023a MD |
417 | if (IS_ERR(s)) { |
418 | struct dentry *dentry = file->f_path.dentry; | |
419 | ||
420 | /* Make sure we give at least some info */ | |
421 | spin_lock(&dentry->d_lock); | |
e7a0ca72 MD |
422 | trace_lttng_statedump_file_descriptor(ctx->session, |
423 | ctx->files, fd, dentry->d_name.name, flags, | |
424 | file->f_mode); | |
361c023a MD |
425 | spin_unlock(&dentry->d_lock); |
426 | goto end; | |
427 | } | |
e7a0ca72 MD |
428 | trace_lttng_statedump_file_descriptor(ctx->session, |
429 | ctx->files, fd, s, flags, file->f_mode); | |
361c023a MD |
430 | end: |
431 | return 0; | |
432 | } | |
c337ddc2 | 433 | |
e7a0ca72 | 434 | /* Called with task lock held. */ |
c337ddc2 | 435 | static |
8cdc1a81 | 436 | void lttng_enumerate_files(struct lttng_kernel_session *session, |
e7a0ca72 MD |
437 | struct files_struct *files, |
438 | char *tmp) | |
c337ddc2 | 439 | { |
e7a0ca72 | 440 | struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, }; |
c337ddc2 | 441 | |
d561ecfb | 442 | lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx); |
c337ddc2 MD |
443 | } |
444 | ||
d0b55e4c | 445 | #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY |
502e4132 | 446 | static |
8cdc1a81 | 447 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
448 | { |
449 | int cpu; | |
450 | const cpumask_t *cpumask = cpu_possible_mask; | |
451 | ||
452 | for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids; | |
453 | cpu = cpumask_next(cpu, cpumask)) { | |
454 | trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu)); | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | #else | |
460 | static | |
8cdc1a81 | 461 | int lttng_enumerate_cpu_topology(struct lttng_kernel_session *session) |
502e4132 JD |
462 | { |
463 | return 0; | |
464 | } | |
465 | #endif | |
466 | ||
0658bdda MD |
467 | #if 0 |
468 | /* | |
469 | * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section | |
470 | * (scheduling in atomic). Normally, the tasklist lock protects this kind of | |
471 | * iteration, but it is not exported to modules. | |
472 | */ | |
c337ddc2 | 473 | static |
8cdc1a81 | 474 | void lttng_enumerate_task_vm_maps(struct lttng_kernel_session *session, |
c337ddc2 MD |
475 | struct task_struct *p) |
476 | { | |
477 | struct mm_struct *mm; | |
478 | struct vm_area_struct *map; | |
479 | unsigned long ino; | |
480 | ||
481 | /* get_task_mm does a task_lock... */ | |
482 | mm = get_task_mm(p); | |
483 | if (!mm) | |
484 | return; | |
485 | ||
486 | map = mm->mmap; | |
487 | if (map) { | |
488 | down_read(&mm->mmap_sem); | |
489 | while (map) { | |
490 | if (map->vm_file) | |
b06ed645 | 491 | ino = map->vm_file->lttng_f_dentry->d_inode->i_ino; |
c337ddc2 MD |
492 | else |
493 | ino = 0; | |
494 | trace_lttng_statedump_vm_map(session, p, map, ino); | |
495 | map = map->vm_next; | |
496 | } | |
497 | up_read(&mm->mmap_sem); | |
498 | } | |
499 | mmput(mm); | |
500 | } | |
501 | ||
502 | static | |
8cdc1a81 | 503 | int lttng_enumerate_vm_maps(struct lttng_kernel_session *session) |
c337ddc2 MD |
504 | { |
505 | struct task_struct *p; | |
506 | ||
507 | rcu_read_lock(); | |
508 | for_each_process(p) | |
509 | lttng_enumerate_task_vm_maps(session, p); | |
510 | rcu_read_unlock(); | |
511 | return 0; | |
512 | } | |
0658bdda | 513 | #endif |
c337ddc2 | 514 | |
29784493 | 515 | #ifdef CONFIG_LTTNG_HAS_LIST_IRQ |
47faec4b | 516 | |
c337ddc2 | 517 | static |
8cdc1a81 | 518 | int lttng_list_interrupts(struct lttng_kernel_session *session) |
c337ddc2 MD |
519 | { |
520 | unsigned int irq; | |
521 | unsigned long flags = 0; | |
522 | struct irq_desc *desc; | |
523 | ||
524 | #define irq_to_desc wrapper_irq_to_desc | |
525 | /* needs irq_desc */ | |
526 | for_each_irq_desc(irq, desc) { | |
527 | struct irqaction *action; | |
528 | const char *irq_chip_name = | |
529 | irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip"; | |
530 | ||
531 | local_irq_save(flags); | |
fc94c945 | 532 | raw_spin_lock(&desc->lock); |
c337ddc2 MD |
533 | for (action = desc->action; action; action = action->next) { |
534 | trace_lttng_statedump_interrupt(session, | |
535 | irq, irq_chip_name, action); | |
536 | } | |
fc94c945 | 537 | raw_spin_unlock(&desc->lock); |
c337ddc2 MD |
538 | local_irq_restore(flags); |
539 | } | |
cfcee1c7 | 540 | return 0; |
c337ddc2 MD |
541 | #undef irq_to_desc |
542 | } | |
543 | #else | |
544 | static inline | |
8cdc1a81 | 545 | int lttng_list_interrupts(struct lttng_kernel_session *session) |
c337ddc2 | 546 | { |
cfcee1c7 | 547 | return 0; |
c337ddc2 MD |
548 | } |
549 | #endif | |
550 | ||
4ba1f53c | 551 | /* |
1965e6b4 MJ |
552 | * Statedump the task's namespaces using the proc filesystem inode number as |
553 | * the unique identifier. The user and pid ns are nested and will be dumped | |
554 | * recursively. | |
555 | * | |
4ba1f53c MD |
556 | * Called with task lock held. |
557 | */ | |
73e8ba37 | 558 | static |
8cdc1a81 | 559 | void lttng_statedump_process_ns(struct lttng_kernel_session *session, |
73e8ba37 JD |
560 | struct task_struct *p, |
561 | enum lttng_thread_type type, | |
562 | enum lttng_execution_mode mode, | |
563 | enum lttng_execution_submode submode, | |
564 | enum lttng_process_status status) | |
565 | { | |
1965e6b4 | 566 | struct nsproxy *proxy; |
73e8ba37 | 567 | struct pid_namespace *pid_ns; |
1965e6b4 | 568 | struct user_namespace *user_ns; |
73e8ba37 | 569 | |
1965e6b4 MJ |
570 | /* |
571 | * The pid and user namespaces are special, they are nested and | |
572 | * accessed with specific functions instead of the nsproxy struct | |
573 | * like the other namespaces. | |
574 | */ | |
887bcdac MJ |
575 | pid_ns = task_active_pid_ns(p); |
576 | do { | |
1965e6b4 | 577 | trace_lttng_statedump_process_pid_ns(session, p, pid_ns); |
adcc8b5e | 578 | pid_ns = pid_ns ? pid_ns->parent : NULL; |
887bcdac | 579 | } while (pid_ns); |
1965e6b4 MJ |
580 | |
581 | ||
582 | user_ns = task_cred_xxx(p, user_ns); | |
583 | do { | |
584 | trace_lttng_statedump_process_user_ns(session, p, user_ns); | |
1964cccb MD |
585 | /* |
586 | * trace_lttng_statedump_process_user_ns() internally | |
587 | * checks whether user_ns is NULL. While this does not | |
588 | * appear to be a possible return value for | |
589 | * task_cred_xxx(), err on the safe side and check | |
590 | * for NULL here as well to be consistent with the | |
591 | * paranoid behavior of | |
592 | * trace_lttng_statedump_process_user_ns(). | |
593 | */ | |
594 | user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL; | |
1965e6b4 MJ |
595 | } while (user_ns); |
596 | ||
597 | /* | |
598 | * Back and forth on locking strategy within Linux upstream for nsproxy. | |
599 | * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3 | |
600 | * "namespaces: Use task_lock and not rcu to protect nsproxy" | |
601 | * for details. | |
602 | */ | |
5f4c791e | 603 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,17,0) || \ |
1965e6b4 MJ |
604 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ |
605 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
606 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
607 | proxy = p->nsproxy; | |
608 | #else | |
609 | rcu_read_lock(); | |
610 | proxy = task_nsproxy(p); | |
611 | #endif | |
612 | if (proxy) { | |
5f4c791e | 613 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,6,0)) |
1965e6b4 MJ |
614 | trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns); |
615 | #endif | |
616 | trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns); | |
617 | #ifndef LTTNG_MNT_NS_MISSING_HEADER | |
618 | trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns); | |
619 | #endif | |
620 | trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns); | |
621 | trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns); | |
fce87a6e MJ |
622 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) || \ |
623 | LTTNG_RHEL_KERNEL_RANGE(4,18,0,305,0,0, 4,19,0,0,0,0)) | |
876e2e92 MJ |
624 | trace_lttng_statedump_process_time_ns(session, p, proxy->time_ns); |
625 | #endif | |
1965e6b4 | 626 | } |
5f4c791e | 627 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,17,0) || \ |
1965e6b4 MJ |
628 | LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \ |
629 | LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \ | |
630 | LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0)) | |
631 | /* (nothing) */ | |
632 | #else | |
633 | rcu_read_unlock(); | |
634 | #endif | |
73e8ba37 JD |
635 | } |
636 | ||
c337ddc2 | 637 | static |
8cdc1a81 | 638 | int lttng_enumerate_process_states(struct lttng_kernel_session *session) |
c337ddc2 MD |
639 | { |
640 | struct task_struct *g, *p; | |
e7a0ca72 MD |
641 | char *tmp; |
642 | ||
643 | tmp = (char *) __get_free_page(GFP_KERNEL); | |
644 | if (!tmp) | |
645 | return -ENOMEM; | |
c337ddc2 MD |
646 | |
647 | rcu_read_lock(); | |
648 | for_each_process(g) { | |
e7a0ca72 MD |
649 | struct files_struct *prev_files = NULL; |
650 | ||
c337ddc2 MD |
651 | p = g; |
652 | do { | |
653 | enum lttng_execution_mode mode = | |
654 | LTTNG_MODE_UNKNOWN; | |
655 | enum lttng_execution_submode submode = | |
656 | LTTNG_UNKNOWN; | |
657 | enum lttng_process_status status; | |
658 | enum lttng_thread_type type; | |
e7a0ca72 | 659 | struct files_struct *files; |
c337ddc2 MD |
660 | |
661 | task_lock(p); | |
662 | if (p->exit_state == EXIT_ZOMBIE) | |
663 | status = LTTNG_ZOMBIE; | |
664 | else if (p->exit_state == EXIT_DEAD) | |
665 | status = LTTNG_DEAD; | |
7259e6a5 | 666 | else if (lttng_task_is_running(p)) { |
c337ddc2 MD |
667 | /* Is this a forked child that has not run yet? */ |
668 | if (list_empty(&p->rt.run_list)) | |
669 | status = LTTNG_WAIT_FORK; | |
670 | else | |
671 | /* | |
672 | * All tasks are considered as wait_cpu; | |
673 | * the viewer will sort out if the task | |
674 | * was really running at this time. | |
675 | */ | |
676 | status = LTTNG_WAIT_CPU; | |
7259e6a5 | 677 | } else if (lttng_get_task_state(p) & |
c337ddc2 MD |
678 | (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) { |
679 | /* Task is waiting for something to complete */ | |
680 | status = LTTNG_WAIT; | |
681 | } else | |
682 | status = LTTNG_UNNAMED; | |
683 | submode = LTTNG_NONE; | |
684 | ||
685 | /* | |
686 | * Verification of t->mm is to filter out kernel | |
687 | * threads; Viewer will further filter out if a | |
688 | * user-space thread was in syscall mode or not. | |
689 | */ | |
690 | if (p->mm) | |
691 | type = LTTNG_USER_THREAD; | |
692 | else | |
693 | type = LTTNG_KERNEL_THREAD; | |
e7a0ca72 | 694 | files = p->files; |
d2a927ac MJ |
695 | |
696 | trace_lttng_statedump_process_state(session, | |
e7a0ca72 | 697 | p, type, mode, submode, status, files); |
73e8ba37 | 698 | lttng_statedump_process_ns(session, |
c337ddc2 | 699 | p, type, mode, submode, status); |
e7a0ca72 MD |
700 | /* |
701 | * As an optimisation for the common case, do not | |
702 | * repeat information for the same files_struct in | |
703 | * two consecutive threads. This is the common case | |
704 | * for threads sharing the same fd table. RCU guarantees | |
705 | * that the same files_struct pointer is not re-used | |
706 | * throughout processes/threads iteration. | |
707 | */ | |
708 | if (files && files != prev_files) { | |
709 | lttng_enumerate_files(session, files, tmp); | |
710 | prev_files = files; | |
711 | } | |
c337ddc2 MD |
712 | task_unlock(p); |
713 | } while_each_thread(g, p); | |
714 | } | |
715 | rcu_read_unlock(); | |
716 | ||
e7a0ca72 MD |
717 | free_page((unsigned long) tmp); |
718 | ||
c337ddc2 MD |
719 | return 0; |
720 | } | |
721 | ||
722 | static | |
723 | void lttng_statedump_work_func(struct work_struct *work) | |
724 | { | |
725 | if (atomic_dec_and_test(&kernel_threads_to_run)) | |
726 | /* If we are the last thread, wake up do_lttng_statedump */ | |
727 | wake_up(&statedump_wq); | |
728 | } | |
729 | ||
730 | static | |
8cdc1a81 | 731 | int do_lttng_statedump(struct lttng_kernel_session *session) |
c337ddc2 | 732 | { |
cfcee1c7 | 733 | int cpu, ret; |
c337ddc2 | 734 | |
c337ddc2 | 735 | trace_lttng_statedump_start(session); |
cfcee1c7 | 736 | ret = lttng_enumerate_process_states(session); |
cfcee1c7 MD |
737 | if (ret) |
738 | return ret; | |
739 | /* | |
740 | * FIXME | |
741 | * ret = lttng_enumerate_vm_maps(session); | |
742 | * if (ret) | |
743 | * return ret; | |
744 | */ | |
745 | ret = lttng_list_interrupts(session); | |
746 | if (ret) | |
747 | return ret; | |
748 | ret = lttng_enumerate_network_ip_interface(session); | |
749 | if (ret) | |
750 | return ret; | |
751 | ret = lttng_enumerate_block_devices(session); | |
752 | switch (ret) { | |
84c7055e MD |
753 | case 0: |
754 | break; | |
cfcee1c7 MD |
755 | case -ENOSYS: |
756 | printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n"); | |
757 | break; | |
758 | default: | |
759 | return ret; | |
760 | } | |
502e4132 JD |
761 | ret = lttng_enumerate_cpu_topology(session); |
762 | if (ret) | |
763 | return ret; | |
c337ddc2 MD |
764 | |
765 | /* TODO lttng_dump_idt_table(session); */ | |
766 | /* TODO lttng_dump_softirq_vec(session); */ | |
767 | /* TODO lttng_list_modules(session); */ | |
768 | /* TODO lttng_dump_swap_files(session); */ | |
769 | ||
770 | /* | |
771 | * Fire off a work queue on each CPU. Their sole purpose in life | |
772 | * is to guarantee that each CPU has been in a state where is was in | |
773 | * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ). | |
774 | */ | |
ffcc8734 | 775 | lttng_cpus_read_lock(); |
c337ddc2 MD |
776 | atomic_set(&kernel_threads_to_run, num_online_cpus()); |
777 | for_each_online_cpu(cpu) { | |
778 | INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func); | |
779 | schedule_delayed_work_on(cpu, &cpu_work[cpu], 0); | |
780 | } | |
781 | /* Wait for all threads to run */ | |
7a7128e0 | 782 | __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0)); |
ffcc8734 | 783 | lttng_cpus_read_unlock(); |
c337ddc2 | 784 | /* Our work is done */ |
c337ddc2 MD |
785 | trace_lttng_statedump_end(session); |
786 | return 0; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Called with session mutex held. | |
791 | */ | |
8cdc1a81 | 792 | int lttng_statedump_start(struct lttng_kernel_session *session) |
c337ddc2 | 793 | { |
c337ddc2 MD |
794 | return do_lttng_statedump(session); |
795 | } | |
796 | EXPORT_SYMBOL_GPL(lttng_statedump_start); | |
797 | ||
dd8d5afb MD |
798 | static |
799 | int __init lttng_statedump_init(void) | |
800 | { | |
d16aa9c9 MD |
801 | /* |
802 | * Allow module to load even if the fixup cannot be done. This | |
803 | * will allow seemless transition when the underlying issue fix | |
804 | * is merged into the Linux kernel, and when tracepoint.c | |
805 | * "tracepoint_module_notify" is turned into a static function. | |
806 | */ | |
807 | (void) wrapper_lttng_fixup_sig(THIS_MODULE); | |
808 | return 0; | |
dd8d5afb MD |
809 | } |
810 | ||
811 | module_init(lttng_statedump_init); | |
812 | ||
461277e7 MD |
813 | static |
814 | void __exit lttng_statedump_exit(void) | |
815 | { | |
816 | } | |
817 | ||
818 | module_exit(lttng_statedump_exit); | |
819 | ||
c337ddc2 MD |
820 | MODULE_LICENSE("GPL and additional rights"); |
821 | MODULE_AUTHOR("Jean-Hugues Deschenes"); | |
1c124020 | 822 | MODULE_DESCRIPTION("LTTng statedump provider"); |
13ab8b0a MD |
823 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." |
824 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
825 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
826 | LTTNG_MODULES_EXTRAVERSION); |