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30428ef5 KK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Test module to generate lockups | |
4 | */ | |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/sched/signal.h> | |
12 | #include <linux/sched/clock.h> | |
13 | #include <linux/cpu.h> | |
14 | #include <linux/nmi.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/uaccess.h> | |
aecd42df | 17 | #include <linux/file.h> |
30428ef5 KK |
18 | |
19 | static unsigned int time_secs; | |
20 | module_param(time_secs, uint, 0600); | |
21 | MODULE_PARM_DESC(time_secs, "lockup time in seconds, default 0"); | |
22 | ||
23 | static unsigned int time_nsecs; | |
24 | module_param(time_nsecs, uint, 0600); | |
25 | MODULE_PARM_DESC(time_nsecs, "nanoseconds part of lockup time, default 0"); | |
26 | ||
27 | static unsigned int cooldown_secs; | |
28 | module_param(cooldown_secs, uint, 0600); | |
29 | MODULE_PARM_DESC(cooldown_secs, "cooldown time between iterations in seconds, default 0"); | |
30 | ||
31 | static unsigned int cooldown_nsecs; | |
32 | module_param(cooldown_nsecs, uint, 0600); | |
33 | MODULE_PARM_DESC(cooldown_nsecs, "nanoseconds part of cooldown, default 0"); | |
34 | ||
35 | static unsigned int iterations = 1; | |
36 | module_param(iterations, uint, 0600); | |
37 | MODULE_PARM_DESC(iterations, "lockup iterations, default 1"); | |
38 | ||
39 | static bool all_cpus; | |
40 | module_param(all_cpus, bool, 0400); | |
41 | MODULE_PARM_DESC(all_cpus, "trigger lockup at all cpus at once"); | |
42 | ||
43 | static int wait_state; | |
44 | static char *state = "R"; | |
45 | module_param(state, charp, 0400); | |
46 | MODULE_PARM_DESC(state, "wait in 'R' running (default), 'D' uninterruptible, 'K' killable, 'S' interruptible state"); | |
47 | ||
48 | static bool use_hrtimer; | |
49 | module_param(use_hrtimer, bool, 0400); | |
50 | MODULE_PARM_DESC(use_hrtimer, "use high-resolution timer for sleeping"); | |
51 | ||
52 | static bool iowait; | |
53 | module_param(iowait, bool, 0400); | |
54 | MODULE_PARM_DESC(iowait, "account sleep time as iowait"); | |
55 | ||
56 | static bool lock_read; | |
57 | module_param(lock_read, bool, 0400); | |
58 | MODULE_PARM_DESC(lock_read, "lock read-write locks for read"); | |
59 | ||
60 | static bool lock_single; | |
61 | module_param(lock_single, bool, 0400); | |
62 | MODULE_PARM_DESC(lock_single, "acquire locks only at one cpu"); | |
63 | ||
64 | static bool reacquire_locks; | |
65 | module_param(reacquire_locks, bool, 0400); | |
66 | MODULE_PARM_DESC(reacquire_locks, "release and reacquire locks/irq/preempt between iterations"); | |
67 | ||
68 | static bool touch_softlockup; | |
69 | module_param(touch_softlockup, bool, 0600); | |
70 | MODULE_PARM_DESC(touch_softlockup, "touch soft-lockup watchdog between iterations"); | |
71 | ||
72 | static bool touch_hardlockup; | |
73 | module_param(touch_hardlockup, bool, 0600); | |
74 | MODULE_PARM_DESC(touch_hardlockup, "touch hard-lockup watchdog between iterations"); | |
75 | ||
76 | static bool call_cond_resched; | |
77 | module_param(call_cond_resched, bool, 0600); | |
78 | MODULE_PARM_DESC(call_cond_resched, "call cond_resched() between iterations"); | |
79 | ||
80 | static bool measure_lock_wait; | |
81 | module_param(measure_lock_wait, bool, 0400); | |
82 | MODULE_PARM_DESC(measure_lock_wait, "measure lock wait time"); | |
83 | ||
84 | static unsigned long lock_wait_threshold = ULONG_MAX; | |
85 | module_param(lock_wait_threshold, ulong, 0400); | |
86 | MODULE_PARM_DESC(lock_wait_threshold, "print lock wait time longer than this in nanoseconds, default off"); | |
87 | ||
88 | static bool test_disable_irq; | |
89 | module_param_named(disable_irq, test_disable_irq, bool, 0400); | |
90 | MODULE_PARM_DESC(disable_irq, "disable interrupts: generate hard-lockups"); | |
91 | ||
92 | static bool disable_softirq; | |
93 | module_param(disable_softirq, bool, 0400); | |
94 | MODULE_PARM_DESC(disable_softirq, "disable bottom-half irq handlers"); | |
95 | ||
96 | static bool disable_preempt; | |
97 | module_param(disable_preempt, bool, 0400); | |
98 | MODULE_PARM_DESC(disable_preempt, "disable preemption: generate soft-lockups"); | |
99 | ||
100 | static bool lock_rcu; | |
101 | module_param(lock_rcu, bool, 0400); | |
102 | MODULE_PARM_DESC(lock_rcu, "grab rcu_read_lock: generate rcu stalls"); | |
103 | ||
104 | static bool lock_mmap_sem; | |
105 | module_param(lock_mmap_sem, bool, 0400); | |
c1e8d7c6 | 106 | MODULE_PARM_DESC(lock_mmap_sem, "lock mm->mmap_lock: block procfs interfaces"); |
30428ef5 KK |
107 | |
108 | static unsigned long lock_rwsem_ptr; | |
109 | module_param_unsafe(lock_rwsem_ptr, ulong, 0400); | |
110 | MODULE_PARM_DESC(lock_rwsem_ptr, "lock rw_semaphore at address"); | |
111 | ||
112 | static unsigned long lock_mutex_ptr; | |
113 | module_param_unsafe(lock_mutex_ptr, ulong, 0400); | |
114 | MODULE_PARM_DESC(lock_mutex_ptr, "lock mutex at address"); | |
115 | ||
116 | static unsigned long lock_spinlock_ptr; | |
117 | module_param_unsafe(lock_spinlock_ptr, ulong, 0400); | |
118 | MODULE_PARM_DESC(lock_spinlock_ptr, "lock spinlock at address"); | |
119 | ||
120 | static unsigned long lock_rwlock_ptr; | |
121 | module_param_unsafe(lock_rwlock_ptr, ulong, 0400); | |
122 | MODULE_PARM_DESC(lock_rwlock_ptr, "lock rwlock at address"); | |
123 | ||
124 | static unsigned int alloc_pages_nr; | |
125 | module_param_unsafe(alloc_pages_nr, uint, 0600); | |
126 | MODULE_PARM_DESC(alloc_pages_nr, "allocate and free pages under locks"); | |
127 | ||
128 | static unsigned int alloc_pages_order; | |
129 | module_param(alloc_pages_order, uint, 0400); | |
130 | MODULE_PARM_DESC(alloc_pages_order, "page order to allocate"); | |
131 | ||
132 | static gfp_t alloc_pages_gfp = GFP_KERNEL; | |
133 | module_param_unsafe(alloc_pages_gfp, uint, 0400); | |
134 | MODULE_PARM_DESC(alloc_pages_gfp, "allocate pages with this gfp_mask, default GFP_KERNEL"); | |
135 | ||
136 | static bool alloc_pages_atomic; | |
137 | module_param(alloc_pages_atomic, bool, 0400); | |
138 | MODULE_PARM_DESC(alloc_pages_atomic, "allocate pages with GFP_ATOMIC"); | |
139 | ||
140 | static bool reallocate_pages; | |
141 | module_param(reallocate_pages, bool, 0400); | |
142 | MODULE_PARM_DESC(reallocate_pages, "free and allocate pages between iterations"); | |
143 | ||
aecd42df | 144 | struct file *test_file; |
02223e36 | 145 | static struct inode *test_inode; |
aecd42df KK |
146 | static char test_file_path[256]; |
147 | module_param_string(file_path, test_file_path, sizeof(test_file_path), 0400); | |
148 | MODULE_PARM_DESC(file_path, "file path to test"); | |
149 | ||
150 | static bool test_lock_inode; | |
151 | module_param_named(lock_inode, test_lock_inode, bool, 0400); | |
152 | MODULE_PARM_DESC(lock_inode, "lock file -> inode -> i_rwsem"); | |
153 | ||
154 | static bool test_lock_mapping; | |
155 | module_param_named(lock_mapping, test_lock_mapping, bool, 0400); | |
156 | MODULE_PARM_DESC(lock_mapping, "lock file -> mapping -> i_mmap_rwsem"); | |
157 | ||
158 | static bool test_lock_sb_umount; | |
159 | module_param_named(lock_sb_umount, test_lock_sb_umount, bool, 0400); | |
160 | MODULE_PARM_DESC(lock_sb_umount, "lock file -> sb -> s_umount"); | |
161 | ||
30428ef5 KK |
162 | static atomic_t alloc_pages_failed = ATOMIC_INIT(0); |
163 | ||
164 | static atomic64_t max_lock_wait = ATOMIC64_INIT(0); | |
165 | ||
166 | static struct task_struct *main_task; | |
167 | static int master_cpu; | |
168 | ||
169 | static void test_lock(bool master, bool verbose) | |
170 | { | |
171 | u64 uninitialized_var(wait_start); | |
172 | ||
173 | if (measure_lock_wait) | |
174 | wait_start = local_clock(); | |
175 | ||
176 | if (lock_mutex_ptr && master) { | |
177 | if (verbose) | |
178 | pr_notice("lock mutex %ps\n", (void *)lock_mutex_ptr); | |
179 | mutex_lock((struct mutex *)lock_mutex_ptr); | |
180 | } | |
181 | ||
182 | if (lock_rwsem_ptr && master) { | |
183 | if (verbose) | |
184 | pr_notice("lock rw_semaphore %ps\n", | |
185 | (void *)lock_rwsem_ptr); | |
186 | if (lock_read) | |
187 | down_read((struct rw_semaphore *)lock_rwsem_ptr); | |
188 | else | |
189 | down_write((struct rw_semaphore *)lock_rwsem_ptr); | |
190 | } | |
191 | ||
192 | if (lock_mmap_sem && master) { | |
193 | if (verbose) | |
c1e8d7c6 | 194 | pr_notice("lock mmap_lock pid=%d\n", main_task->pid); |
30428ef5 | 195 | if (lock_read) |
d8ed45c5 | 196 | mmap_read_lock(main_task->mm); |
30428ef5 | 197 | else |
d8ed45c5 | 198 | mmap_write_lock(main_task->mm); |
30428ef5 KK |
199 | } |
200 | ||
201 | if (test_disable_irq) | |
202 | local_irq_disable(); | |
203 | ||
204 | if (disable_softirq) | |
205 | local_bh_disable(); | |
206 | ||
207 | if (disable_preempt) | |
208 | preempt_disable(); | |
209 | ||
210 | if (lock_rcu) | |
211 | rcu_read_lock(); | |
212 | ||
213 | if (lock_spinlock_ptr && master) { | |
214 | if (verbose) | |
215 | pr_notice("lock spinlock %ps\n", | |
216 | (void *)lock_spinlock_ptr); | |
217 | spin_lock((spinlock_t *)lock_spinlock_ptr); | |
218 | } | |
219 | ||
220 | if (lock_rwlock_ptr && master) { | |
221 | if (verbose) | |
222 | pr_notice("lock rwlock %ps\n", | |
223 | (void *)lock_rwlock_ptr); | |
224 | if (lock_read) | |
225 | read_lock((rwlock_t *)lock_rwlock_ptr); | |
226 | else | |
227 | write_lock((rwlock_t *)lock_rwlock_ptr); | |
228 | } | |
229 | ||
230 | if (measure_lock_wait) { | |
231 | s64 cur_wait = local_clock() - wait_start; | |
232 | s64 max_wait = atomic64_read(&max_lock_wait); | |
233 | ||
234 | do { | |
235 | if (cur_wait < max_wait) | |
236 | break; | |
237 | max_wait = atomic64_cmpxchg(&max_lock_wait, | |
238 | max_wait, cur_wait); | |
239 | } while (max_wait != cur_wait); | |
240 | ||
241 | if (cur_wait > lock_wait_threshold) | |
242 | pr_notice_ratelimited("lock wait %lld ns\n", cur_wait); | |
243 | } | |
244 | } | |
245 | ||
246 | static void test_unlock(bool master, bool verbose) | |
247 | { | |
248 | if (lock_rwlock_ptr && master) { | |
249 | if (lock_read) | |
250 | read_unlock((rwlock_t *)lock_rwlock_ptr); | |
251 | else | |
252 | write_unlock((rwlock_t *)lock_rwlock_ptr); | |
253 | if (verbose) | |
254 | pr_notice("unlock rwlock %ps\n", | |
255 | (void *)lock_rwlock_ptr); | |
256 | } | |
257 | ||
258 | if (lock_spinlock_ptr && master) { | |
259 | spin_unlock((spinlock_t *)lock_spinlock_ptr); | |
260 | if (verbose) | |
261 | pr_notice("unlock spinlock %ps\n", | |
262 | (void *)lock_spinlock_ptr); | |
263 | } | |
264 | ||
265 | if (lock_rcu) | |
266 | rcu_read_unlock(); | |
267 | ||
268 | if (disable_preempt) | |
269 | preempt_enable(); | |
270 | ||
271 | if (disable_softirq) | |
272 | local_bh_enable(); | |
273 | ||
274 | if (test_disable_irq) | |
275 | local_irq_enable(); | |
276 | ||
277 | if (lock_mmap_sem && master) { | |
278 | if (lock_read) | |
d8ed45c5 | 279 | mmap_read_unlock(main_task->mm); |
30428ef5 | 280 | else |
d8ed45c5 | 281 | mmap_write_unlock(main_task->mm); |
30428ef5 | 282 | if (verbose) |
c1e8d7c6 | 283 | pr_notice("unlock mmap_lock pid=%d\n", main_task->pid); |
30428ef5 KK |
284 | } |
285 | ||
286 | if (lock_rwsem_ptr && master) { | |
287 | if (lock_read) | |
288 | up_read((struct rw_semaphore *)lock_rwsem_ptr); | |
289 | else | |
290 | up_write((struct rw_semaphore *)lock_rwsem_ptr); | |
291 | if (verbose) | |
292 | pr_notice("unlock rw_semaphore %ps\n", | |
293 | (void *)lock_rwsem_ptr); | |
294 | } | |
295 | ||
296 | if (lock_mutex_ptr && master) { | |
297 | mutex_unlock((struct mutex *)lock_mutex_ptr); | |
298 | if (verbose) | |
299 | pr_notice("unlock mutex %ps\n", | |
300 | (void *)lock_mutex_ptr); | |
301 | } | |
302 | } | |
303 | ||
304 | static void test_alloc_pages(struct list_head *pages) | |
305 | { | |
306 | struct page *page; | |
307 | unsigned int i; | |
308 | ||
309 | for (i = 0; i < alloc_pages_nr; i++) { | |
310 | page = alloc_pages(alloc_pages_gfp, alloc_pages_order); | |
311 | if (!page) { | |
312 | atomic_inc(&alloc_pages_failed); | |
313 | break; | |
314 | } | |
315 | list_add(&page->lru, pages); | |
316 | } | |
317 | } | |
318 | ||
319 | static void test_free_pages(struct list_head *pages) | |
320 | { | |
321 | struct page *page, *next; | |
322 | ||
323 | list_for_each_entry_safe(page, next, pages, lru) | |
324 | __free_pages(page, alloc_pages_order); | |
325 | INIT_LIST_HEAD(pages); | |
326 | } | |
327 | ||
328 | static void test_wait(unsigned int secs, unsigned int nsecs) | |
329 | { | |
330 | if (wait_state == TASK_RUNNING) { | |
331 | if (secs) | |
332 | mdelay(secs * MSEC_PER_SEC); | |
333 | if (nsecs) | |
334 | ndelay(nsecs); | |
335 | return; | |
336 | } | |
337 | ||
338 | __set_current_state(wait_state); | |
339 | if (use_hrtimer) { | |
340 | ktime_t time; | |
341 | ||
342 | time = ns_to_ktime((u64)secs * NSEC_PER_SEC + nsecs); | |
343 | schedule_hrtimeout(&time, HRTIMER_MODE_REL); | |
344 | } else { | |
345 | schedule_timeout(secs * HZ + nsecs_to_jiffies(nsecs)); | |
346 | } | |
347 | } | |
348 | ||
349 | static void test_lockup(bool master) | |
350 | { | |
351 | u64 lockup_start = local_clock(); | |
352 | unsigned int iter = 0; | |
353 | LIST_HEAD(pages); | |
354 | ||
355 | pr_notice("Start on CPU%d\n", raw_smp_processor_id()); | |
356 | ||
357 | test_lock(master, true); | |
358 | ||
359 | test_alloc_pages(&pages); | |
360 | ||
361 | while (iter++ < iterations && !signal_pending(main_task)) { | |
362 | ||
363 | if (iowait) | |
364 | current->in_iowait = 1; | |
365 | ||
366 | test_wait(time_secs, time_nsecs); | |
367 | ||
368 | if (iowait) | |
369 | current->in_iowait = 0; | |
370 | ||
371 | if (reallocate_pages) | |
372 | test_free_pages(&pages); | |
373 | ||
374 | if (reacquire_locks) | |
375 | test_unlock(master, false); | |
376 | ||
377 | if (touch_softlockup) | |
378 | touch_softlockup_watchdog(); | |
379 | ||
380 | if (touch_hardlockup) | |
381 | touch_nmi_watchdog(); | |
382 | ||
383 | if (call_cond_resched) | |
384 | cond_resched(); | |
385 | ||
386 | test_wait(cooldown_secs, cooldown_nsecs); | |
387 | ||
388 | if (reacquire_locks) | |
389 | test_lock(master, false); | |
390 | ||
391 | if (reallocate_pages) | |
392 | test_alloc_pages(&pages); | |
393 | } | |
394 | ||
395 | pr_notice("Finish on CPU%d in %lld ns\n", raw_smp_processor_id(), | |
396 | local_clock() - lockup_start); | |
397 | ||
398 | test_free_pages(&pages); | |
399 | ||
400 | test_unlock(master, true); | |
401 | } | |
402 | ||
403 | DEFINE_PER_CPU(struct work_struct, test_works); | |
404 | ||
405 | static void test_work_fn(struct work_struct *work) | |
406 | { | |
407 | test_lockup(!lock_single || | |
408 | work == per_cpu_ptr(&test_works, master_cpu)); | |
409 | } | |
410 | ||
411 | static bool test_kernel_ptr(unsigned long addr, int size) | |
412 | { | |
413 | void *ptr = (void *)addr; | |
414 | char buf; | |
415 | ||
416 | if (!addr) | |
417 | return false; | |
418 | ||
419 | /* should be at least readable kernel address */ | |
420 | if (access_ok(ptr, 1) || | |
421 | access_ok(ptr + size - 1, 1) || | |
422 | probe_kernel_address(ptr, buf) || | |
423 | probe_kernel_address(ptr + size - 1, buf)) { | |
424 | pr_err("invalid kernel ptr: %#lx\n", addr); | |
425 | return true; | |
426 | } | |
427 | ||
428 | return false; | |
429 | } | |
430 | ||
431 | static bool __maybe_unused test_magic(unsigned long addr, int offset, | |
432 | unsigned int expected) | |
433 | { | |
434 | void *ptr = (void *)addr + offset; | |
435 | unsigned int magic = 0; | |
436 | ||
437 | if (!addr) | |
438 | return false; | |
439 | ||
440 | if (probe_kernel_address(ptr, magic) || magic != expected) { | |
441 | pr_err("invalid magic at %#lx + %#x = %#x, expected %#x\n", | |
442 | addr, offset, magic, expected); | |
443 | return true; | |
444 | } | |
445 | ||
446 | return false; | |
447 | } | |
448 | ||
449 | static int __init test_lockup_init(void) | |
450 | { | |
451 | u64 test_start = local_clock(); | |
452 | ||
453 | main_task = current; | |
454 | ||
455 | switch (state[0]) { | |
456 | case 'S': | |
457 | wait_state = TASK_INTERRUPTIBLE; | |
458 | break; | |
459 | case 'D': | |
460 | wait_state = TASK_UNINTERRUPTIBLE; | |
461 | break; | |
462 | case 'K': | |
463 | wait_state = TASK_KILLABLE; | |
464 | break; | |
465 | case 'R': | |
466 | wait_state = TASK_RUNNING; | |
467 | break; | |
468 | default: | |
469 | pr_err("unknown state=%s\n", state); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | if (alloc_pages_atomic) | |
474 | alloc_pages_gfp = GFP_ATOMIC; | |
475 | ||
476 | if (test_kernel_ptr(lock_spinlock_ptr, sizeof(spinlock_t)) || | |
477 | test_kernel_ptr(lock_rwlock_ptr, sizeof(rwlock_t)) || | |
478 | test_kernel_ptr(lock_mutex_ptr, sizeof(struct mutex)) || | |
479 | test_kernel_ptr(lock_rwsem_ptr, sizeof(struct rw_semaphore))) | |
480 | return -EINVAL; | |
481 | ||
482 | #ifdef CONFIG_DEBUG_SPINLOCK | |
483 | if (test_magic(lock_spinlock_ptr, | |
484 | offsetof(spinlock_t, rlock.magic), | |
485 | SPINLOCK_MAGIC) || | |
486 | test_magic(lock_rwlock_ptr, | |
487 | offsetof(rwlock_t, magic), | |
488 | RWLOCK_MAGIC) || | |
489 | test_magic(lock_mutex_ptr, | |
490 | offsetof(struct mutex, wait_lock.rlock.magic), | |
491 | SPINLOCK_MAGIC) || | |
492 | test_magic(lock_rwsem_ptr, | |
493 | offsetof(struct rw_semaphore, wait_lock.magic), | |
494 | SPINLOCK_MAGIC)) | |
495 | return -EINVAL; | |
496 | #endif | |
497 | ||
498 | if ((wait_state != TASK_RUNNING || | |
499 | (call_cond_resched && !reacquire_locks) || | |
500 | (alloc_pages_nr && gfpflags_allow_blocking(alloc_pages_gfp))) && | |
501 | (test_disable_irq || disable_softirq || disable_preempt || | |
502 | lock_rcu || lock_spinlock_ptr || lock_rwlock_ptr)) { | |
503 | pr_err("refuse to sleep in atomic context\n"); | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
507 | if (lock_mmap_sem && !main_task->mm) { | |
c1e8d7c6 | 508 | pr_err("no mm to lock mmap_lock\n"); |
30428ef5 KK |
509 | return -EINVAL; |
510 | } | |
511 | ||
aecd42df KK |
512 | if (test_file_path[0]) { |
513 | test_file = filp_open(test_file_path, O_RDONLY, 0); | |
514 | if (IS_ERR(test_file)) { | |
515 | pr_err("cannot find file_path\n"); | |
516 | return -EINVAL; | |
517 | } | |
518 | test_inode = file_inode(test_file); | |
519 | } else if (test_lock_inode || | |
520 | test_lock_mapping || | |
521 | test_lock_sb_umount) { | |
522 | pr_err("no file to lock\n"); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | if (test_lock_inode && test_inode) | |
527 | lock_rwsem_ptr = (unsigned long)&test_inode->i_rwsem; | |
528 | ||
529 | if (test_lock_mapping && test_file && test_file->f_mapping) | |
530 | lock_rwsem_ptr = (unsigned long)&test_file->f_mapping->i_mmap_rwsem; | |
531 | ||
532 | if (test_lock_sb_umount && test_inode) | |
533 | lock_rwsem_ptr = (unsigned long)&test_inode->i_sb->s_umount; | |
534 | ||
ad3f434b | 535 | pr_notice("START pid=%d time=%u +%u ns cooldown=%u +%u ns iterations=%u state=%s %s%s%s%s%s%s%s%s%s%s%s\n", |
30428ef5 KK |
536 | main_task->pid, time_secs, time_nsecs, |
537 | cooldown_secs, cooldown_nsecs, iterations, state, | |
538 | all_cpus ? "all_cpus " : "", | |
539 | iowait ? "iowait " : "", | |
540 | test_disable_irq ? "disable_irq " : "", | |
541 | disable_softirq ? "disable_softirq " : "", | |
542 | disable_preempt ? "disable_preempt " : "", | |
543 | lock_rcu ? "lock_rcu " : "", | |
544 | lock_read ? "lock_read " : "", | |
545 | touch_softlockup ? "touch_softlockup " : "", | |
546 | touch_hardlockup ? "touch_hardlockup " : "", | |
547 | call_cond_resched ? "call_cond_resched " : "", | |
548 | reacquire_locks ? "reacquire_locks " : ""); | |
549 | ||
550 | if (alloc_pages_nr) | |
551 | pr_notice("ALLOCATE PAGES nr=%u order=%u gfp=%pGg %s\n", | |
552 | alloc_pages_nr, alloc_pages_order, &alloc_pages_gfp, | |
553 | reallocate_pages ? "reallocate_pages " : ""); | |
554 | ||
555 | if (all_cpus) { | |
556 | unsigned int cpu; | |
557 | ||
558 | cpus_read_lock(); | |
559 | ||
560 | preempt_disable(); | |
561 | master_cpu = smp_processor_id(); | |
562 | for_each_online_cpu(cpu) { | |
563 | INIT_WORK(per_cpu_ptr(&test_works, cpu), test_work_fn); | |
564 | queue_work_on(cpu, system_highpri_wq, | |
565 | per_cpu_ptr(&test_works, cpu)); | |
566 | } | |
567 | preempt_enable(); | |
568 | ||
569 | for_each_online_cpu(cpu) | |
570 | flush_work(per_cpu_ptr(&test_works, cpu)); | |
571 | ||
572 | cpus_read_unlock(); | |
573 | } else { | |
574 | test_lockup(true); | |
575 | } | |
576 | ||
577 | if (measure_lock_wait) | |
578 | pr_notice("Maximum lock wait: %lld ns\n", | |
579 | atomic64_read(&max_lock_wait)); | |
580 | ||
581 | if (alloc_pages_nr) | |
582 | pr_notice("Page allocation failed %u times\n", | |
583 | atomic_read(&alloc_pages_failed)); | |
584 | ||
585 | pr_notice("FINISH in %llu ns\n", local_clock() - test_start); | |
586 | ||
aecd42df KK |
587 | if (test_file) |
588 | fput(test_file); | |
589 | ||
30428ef5 KK |
590 | if (signal_pending(main_task)) |
591 | return -EINTR; | |
592 | ||
593 | return -EAGAIN; | |
594 | } | |
595 | module_init(test_lockup_init); | |
596 | ||
597 | MODULE_LICENSE("GPL"); | |
598 | MODULE_AUTHOR("Konstantin Khlebnikov <khlebnikov@yandex-team.ru>"); | |
599 | MODULE_DESCRIPTION("Test module to generate lockups"); |