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a241ec65 | 1 | /* |
29766f1e | 2 | * Read-Copy Update module-based torture test facility |
a241ec65 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
a71fca58 | 21 | * Josh Triplett <josh@freedesktop.org> |
a241ec65 PM |
22 | * |
23 | * See also: Documentation/RCU/torture.txt | |
24 | */ | |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/smp.h> | |
33 | #include <linux/rcupdate.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/sched.h> | |
60063497 | 36 | #include <linux/atomic.h> |
a241ec65 | 37 | #include <linux/bitops.h> |
a241ec65 PM |
38 | #include <linux/completion.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/notifier.h> | |
343e9099 | 42 | #include <linux/reboot.h> |
83144186 | 43 | #include <linux/freezer.h> |
a241ec65 | 44 | #include <linux/cpu.h> |
a241ec65 | 45 | #include <linux/delay.h> |
a241ec65 | 46 | #include <linux/stat.h> |
b2896d2e | 47 | #include <linux/srcu.h> |
1aeb272c | 48 | #include <linux/slab.h> |
52494535 | 49 | #include <linux/trace_clock.h> |
f07767fd | 50 | #include <asm/byteorder.h> |
51b1130e | 51 | #include <linux/torture.h> |
a241ec65 PM |
52 | |
53 | MODULE_LICENSE("GPL"); | |
5cf05ad7 | 54 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>"); |
a241ec65 | 55 | |
4102adab PM |
56 | MODULE_ALIAS("rcutorture"); |
57 | #ifdef MODULE_PARAM_PREFIX | |
58 | #undef MODULE_PARAM_PREFIX | |
59 | #endif | |
60 | #define MODULE_PARAM_PREFIX "rcutorture." | |
61 | ||
9e250225 PM |
62 | torture_param(int, fqs_duration, 0, |
63 | "Duration of fqs bursts (us), 0 to disable"); | |
64 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
65 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
66 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); | |
67 | torture_param(bool, gp_normal, false, | |
68 | "Use normal (non-expedited) GP wait primitives"); | |
69 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); | |
70 | torture_param(int, n_barrier_cbs, 0, | |
71 | "# of callbacks/kthreads for barrier testing"); | |
72 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
73 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
74 | torture_param(int, object_debug, 0, | |
75 | "Enable debug-object double call_rcu() testing"); | |
76 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
77 | torture_param(int, onoff_interval, 0, | |
78 | "Time between CPU hotplugs (s), 0=disable"); | |
79 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); | |
80 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
81 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
82 | torture_param(int, stall_cpu_holdoff, 10, | |
83 | "Time to wait before starting stall (s)."); | |
84 | torture_param(int, stat_interval, 60, | |
85 | "Number of seconds between stats printk()s"); | |
86 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
87 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
88 | torture_param(int, test_boost_duration, 4, | |
89 | "Duration of each boost test, seconds."); | |
90 | torture_param(int, test_boost_interval, 7, | |
91 | "Interval between boost tests, seconds."); | |
92 | torture_param(bool, test_no_idle_hz, true, | |
93 | "Test support for tickless idle CPUs"); | |
9e250225 | 94 | |
f67a3356 PM |
95 | char *torture_type = "rcu"; |
96 | EXPORT_SYMBOL_GPL(torture_type); | |
d6ad6711 | 97 | module_param(torture_type, charp, 0444); |
d10453e9 | 98 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
f67a3356 PM |
99 | bool verbose; |
100 | EXPORT_SYMBOL_GPL(verbose); | |
101 | module_param(verbose, bool, 0444); | |
102 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); | |
72e9bb54 | 103 | |
a241ec65 PM |
104 | static int nrealreaders; |
105 | static struct task_struct *writer_task; | |
b772e1dd | 106 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
107 | static struct task_struct **reader_tasks; |
108 | static struct task_struct *stats_task; | |
d120f65f | 109 | static struct task_struct *stutter_task; |
bf66f18e | 110 | static struct task_struct *fqs_task; |
8e8be45e | 111 | static struct task_struct *boost_tasks[NR_CPUS]; |
d5f546d8 | 112 | static struct task_struct *shutdown_task; |
c13f3757 | 113 | static struct task_struct *stall_task; |
fae4b54f PM |
114 | static struct task_struct **barrier_cbs_tasks; |
115 | static struct task_struct *barrier_task; | |
a241ec65 PM |
116 | |
117 | #define RCU_TORTURE_PIPE_LEN 10 | |
118 | ||
119 | struct rcu_torture { | |
120 | struct rcu_head rtort_rcu; | |
121 | int rtort_pipe_count; | |
122 | struct list_head rtort_free; | |
996417d2 | 123 | int rtort_mbtest; |
a241ec65 PM |
124 | }; |
125 | ||
a241ec65 | 126 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 127 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 128 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
129 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
130 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
806274c0 PM |
131 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], |
132 | rcu_torture_count) = { 0 }; | |
133 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], | |
134 | rcu_torture_batch) = { 0 }; | |
a241ec65 | 135 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
136 | static atomic_t n_rcu_torture_alloc; |
137 | static atomic_t n_rcu_torture_alloc_fail; | |
138 | static atomic_t n_rcu_torture_free; | |
139 | static atomic_t n_rcu_torture_mberror; | |
140 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 141 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
142 | static long n_rcu_torture_boost_ktrerror; |
143 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
144 | static long n_rcu_torture_boost_failure; |
145 | static long n_rcu_torture_boosts; | |
a71fca58 | 146 | static long n_rcu_torture_timers; |
fae4b54f PM |
147 | static long n_barrier_attempts; |
148 | static long n_barrier_successes; | |
e3033736 | 149 | static struct list_head rcu_torture_removed; |
a241ec65 | 150 | |
a71fca58 | 151 | static int stutter_pause_test; |
d120f65f | 152 | |
31a72bce PM |
153 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
154 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
155 | #else | |
156 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
157 | #endif | |
158 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
159 | module_param(rcutorture_runnable, int, 0444); |
160 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 161 | |
3acf4a9a | 162 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 163 | #define rcu_can_boost() 1 |
3acf4a9a | 164 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 165 | #define rcu_can_boost() 0 |
3acf4a9a | 166 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 167 | |
e4aa0da3 SR |
168 | #ifdef CONFIG_RCU_TRACE |
169 | static u64 notrace rcu_trace_clock_local(void) | |
170 | { | |
171 | u64 ts = trace_clock_local(); | |
172 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
173 | return ts; | |
174 | } | |
175 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
176 | static u64 notrace rcu_trace_clock_local(void) | |
177 | { | |
178 | return 0ULL; | |
179 | } | |
180 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
181 | ||
d5f546d8 | 182 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
183 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
184 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
185 | /* and boost task create/destroy. */ | |
fae4b54f | 186 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 187 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
188 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
189 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
190 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 191 | |
d5f546d8 PM |
192 | /* Forward reference. */ |
193 | static void rcu_torture_cleanup(void); | |
194 | ||
343e9099 | 195 | /* |
c9d557c1 | 196 | * Detect and respond to a system shutdown. |
343e9099 PM |
197 | */ |
198 | static int | |
199 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
200 | unsigned long unused2, void *unused3) | |
201 | { | |
c59ab97e | 202 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 203 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 204 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 | 205 | else |
2caa1e44 | 206 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 207 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
c59ab97e | 208 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
209 | return NOTIFY_DONE; |
210 | } | |
211 | ||
a241ec65 PM |
212 | /* |
213 | * Allocate an element from the rcu_tortures pool. | |
214 | */ | |
97a41e26 | 215 | static struct rcu_torture * |
a241ec65 PM |
216 | rcu_torture_alloc(void) |
217 | { | |
218 | struct list_head *p; | |
219 | ||
adac1665 | 220 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
221 | if (list_empty(&rcu_torture_freelist)) { |
222 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 223 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
224 | return NULL; |
225 | } | |
226 | atomic_inc(&n_rcu_torture_alloc); | |
227 | p = rcu_torture_freelist.next; | |
228 | list_del_init(p); | |
adac1665 | 229 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
230 | return container_of(p, struct rcu_torture, rtort_free); |
231 | } | |
232 | ||
233 | /* | |
234 | * Free an element to the rcu_tortures pool. | |
235 | */ | |
236 | static void | |
237 | rcu_torture_free(struct rcu_torture *p) | |
238 | { | |
239 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 240 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 241 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 242 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
243 | } |
244 | ||
d120f65f | 245 | static void |
e66c33d5 | 246 | rcu_stutter_wait(const char *title) |
d120f65f | 247 | { |
c9d557c1 | 248 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
249 | if (rcutorture_runnable) |
250 | schedule_timeout_interruptible(1); | |
251 | else | |
3ccf79f4 | 252 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
f67a3356 | 253 | torture_shutdown_absorb(title); |
343e9099 | 254 | } |
d120f65f PM |
255 | } |
256 | ||
72e9bb54 PM |
257 | /* |
258 | * Operations vector for selecting different types of tests. | |
259 | */ | |
260 | ||
261 | struct rcu_torture_ops { | |
262 | void (*init)(void); | |
72e9bb54 | 263 | int (*readlock)(void); |
51b1130e | 264 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 PM |
265 | void (*readunlock)(int idx); |
266 | int (*completed)(void); | |
0acc512c | 267 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 268 | void (*sync)(void); |
2ec1f2d9 | 269 | void (*exp_sync)(void); |
fae4b54f | 270 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 271 | void (*cb_barrier)(void); |
bf66f18e | 272 | void (*fqs)(void); |
d1008950 | 273 | void (*stats)(char *page); |
0acc512c | 274 | int irq_capable; |
8e8be45e | 275 | int can_boost; |
e66c33d5 | 276 | const char *name; |
72e9bb54 | 277 | }; |
a71fca58 PM |
278 | |
279 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
280 | |
281 | /* | |
282 | * Definitions for rcu torture testing. | |
283 | */ | |
284 | ||
a49a4af7 | 285 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
286 | { |
287 | rcu_read_lock(); | |
288 | return 0; | |
289 | } | |
290 | ||
51b1130e | 291 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 292 | { |
b8d57a76 JT |
293 | const unsigned long shortdelay_us = 200; |
294 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 295 | |
b8d57a76 JT |
296 | /* We want a short delay sometimes to make a reader delay the grace |
297 | * period, and we want a long delay occasionally to trigger | |
298 | * force_quiescent_state. */ | |
b2896d2e | 299 | |
51b1130e | 300 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 301 | mdelay(longdelay_ms); |
51b1130e | 302 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 303 | udelay(shortdelay_us); |
e546f485 | 304 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
305 | if (!preempt_count() && |
306 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
307 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
308 | #endif | |
b2896d2e PM |
309 | } |
310 | ||
a49a4af7 | 311 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
312 | { |
313 | rcu_read_unlock(); | |
314 | } | |
315 | ||
316 | static int rcu_torture_completed(void) | |
317 | { | |
318 | return rcu_batches_completed(); | |
319 | } | |
320 | ||
321 | static void | |
322 | rcu_torture_cb(struct rcu_head *p) | |
323 | { | |
324 | int i; | |
325 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
326 | ||
c9d557c1 | 327 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
328 | /* Test is ending, just drop callbacks on the floor. */ |
329 | /* The next initialization will pick up the pieces. */ | |
330 | return; | |
331 | } | |
332 | i = rp->rtort_pipe_count; | |
333 | if (i > RCU_TORTURE_PIPE_LEN) | |
334 | i = RCU_TORTURE_PIPE_LEN; | |
335 | atomic_inc(&rcu_torture_wcount[i]); | |
336 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
337 | rp->rtort_mbtest = 0; | |
338 | rcu_torture_free(rp); | |
c701d5d9 | 339 | } else { |
0acc512c | 340 | cur_ops->deferred_free(rp); |
c701d5d9 | 341 | } |
72e9bb54 PM |
342 | } |
343 | ||
d9a3da06 PM |
344 | static int rcu_no_completed(void) |
345 | { | |
346 | return 0; | |
347 | } | |
348 | ||
72e9bb54 PM |
349 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
350 | { | |
351 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
352 | } | |
353 | ||
e3033736 JT |
354 | static void rcu_sync_torture_init(void) |
355 | { | |
356 | INIT_LIST_HEAD(&rcu_torture_removed); | |
357 | } | |
358 | ||
2ec1f2d9 | 359 | static struct rcu_torture_ops rcu_ops = { |
0acc512c | 360 | .init = rcu_sync_torture_init, |
0acc512c PM |
361 | .readlock = rcu_torture_read_lock, |
362 | .read_delay = rcu_read_delay, | |
363 | .readunlock = rcu_torture_read_unlock, | |
364 | .completed = rcu_torture_completed, | |
2ec1f2d9 | 365 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 366 | .sync = synchronize_rcu, |
2ec1f2d9 PM |
367 | .exp_sync = synchronize_rcu_expedited, |
368 | .call = call_rcu, | |
369 | .cb_barrier = rcu_barrier, | |
bf66f18e | 370 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
371 | .stats = NULL, |
372 | .irq_capable = 1, | |
8e8be45e | 373 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 374 | .name = "rcu" |
d9a3da06 PM |
375 | }; |
376 | ||
c32e0660 PM |
377 | /* |
378 | * Definitions for rcu_bh torture testing. | |
379 | */ | |
380 | ||
a49a4af7 | 381 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
382 | { |
383 | rcu_read_lock_bh(); | |
384 | return 0; | |
385 | } | |
386 | ||
a49a4af7 | 387 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
388 | { |
389 | rcu_read_unlock_bh(); | |
390 | } | |
391 | ||
392 | static int rcu_bh_torture_completed(void) | |
393 | { | |
394 | return rcu_batches_completed_bh(); | |
395 | } | |
396 | ||
397 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
398 | { | |
399 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
400 | } | |
401 | ||
402 | static struct rcu_torture_ops rcu_bh_ops = { | |
2ec1f2d9 | 403 | .init = rcu_sync_torture_init, |
0acc512c PM |
404 | .readlock = rcu_bh_torture_read_lock, |
405 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
406 | .readunlock = rcu_bh_torture_read_unlock, | |
407 | .completed = rcu_bh_torture_completed, | |
408 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 409 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 410 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 411 | .call = call_rcu_bh, |
0acc512c | 412 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 413 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
414 | .stats = NULL, |
415 | .irq_capable = 1, | |
416 | .name = "rcu_bh" | |
c32e0660 PM |
417 | }; |
418 | ||
b2896d2e PM |
419 | /* |
420 | * Definitions for srcu torture testing. | |
421 | */ | |
422 | ||
cda4dc81 | 423 | DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e | 424 | |
012d3ca8 | 425 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
426 | { |
427 | return srcu_read_lock(&srcu_ctl); | |
428 | } | |
429 | ||
51b1130e | 430 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
431 | { |
432 | long delay; | |
433 | const long uspertick = 1000000 / HZ; | |
434 | const long longdelay = 10; | |
435 | ||
436 | /* We want there to be long-running readers, but not all the time. */ | |
437 | ||
51b1130e PM |
438 | delay = torture_random(rrsp) % |
439 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
440 | if (!delay) |
441 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
442 | else |
443 | rcu_read_delay(rrsp); | |
b2896d2e PM |
444 | } |
445 | ||
012d3ca8 | 446 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
447 | { |
448 | srcu_read_unlock(&srcu_ctl, idx); | |
449 | } | |
450 | ||
451 | static int srcu_torture_completed(void) | |
452 | { | |
453 | return srcu_batches_completed(&srcu_ctl); | |
454 | } | |
455 | ||
9059c940 LJ |
456 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
457 | { | |
458 | call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); | |
459 | } | |
460 | ||
b772e1dd JT |
461 | static void srcu_torture_synchronize(void) |
462 | { | |
463 | synchronize_srcu(&srcu_ctl); | |
464 | } | |
465 | ||
e3f8d378 PM |
466 | static void srcu_torture_call(struct rcu_head *head, |
467 | void (*func)(struct rcu_head *head)) | |
468 | { | |
469 | call_srcu(&srcu_ctl, head, func); | |
470 | } | |
471 | ||
472 | static void srcu_torture_barrier(void) | |
473 | { | |
474 | srcu_barrier(&srcu_ctl); | |
475 | } | |
476 | ||
d1008950 | 477 | static void srcu_torture_stats(char *page) |
b2896d2e | 478 | { |
b2896d2e PM |
479 | int cpu; |
480 | int idx = srcu_ctl.completed & 0x1; | |
481 | ||
d1008950 | 482 | page += sprintf(page, "%s%s per-CPU(idx=%d):", |
b2896d2e PM |
483 | torture_type, TORTURE_FLAG, idx); |
484 | for_each_possible_cpu(cpu) { | |
d1008950 | 485 | page += sprintf(page, " %d(%lu,%lu)", cpu, |
b2896d2e PM |
486 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
487 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
488 | } | |
d1008950 | 489 | sprintf(page, "\n"); |
b2896d2e PM |
490 | } |
491 | ||
2ec1f2d9 PM |
492 | static void srcu_torture_synchronize_expedited(void) |
493 | { | |
494 | synchronize_srcu_expedited(&srcu_ctl); | |
495 | } | |
496 | ||
b2896d2e | 497 | static struct rcu_torture_ops srcu_ops = { |
cda4dc81 | 498 | .init = rcu_sync_torture_init, |
0acc512c PM |
499 | .readlock = srcu_torture_read_lock, |
500 | .read_delay = srcu_read_delay, | |
501 | .readunlock = srcu_torture_read_unlock, | |
502 | .completed = srcu_torture_completed, | |
9059c940 | 503 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 504 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 505 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
506 | .call = srcu_torture_call, |
507 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
508 | .stats = srcu_torture_stats, |
509 | .name = "srcu" | |
b2896d2e PM |
510 | }; |
511 | ||
4b6c2cca JT |
512 | /* |
513 | * Definitions for sched torture testing. | |
514 | */ | |
515 | ||
516 | static int sched_torture_read_lock(void) | |
517 | { | |
518 | preempt_disable(); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | static void sched_torture_read_unlock(int idx) | |
523 | { | |
524 | preempt_enable(); | |
525 | } | |
526 | ||
2326974d PM |
527 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
528 | { | |
529 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
530 | } | |
531 | ||
4b6c2cca | 532 | static struct rcu_torture_ops sched_ops = { |
0acc512c | 533 | .init = rcu_sync_torture_init, |
0acc512c PM |
534 | .readlock = sched_torture_read_lock, |
535 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
536 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 537 | .completed = rcu_no_completed, |
0acc512c | 538 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 539 | .sync = synchronize_sched, |
2ec1f2d9 PM |
540 | .exp_sync = synchronize_sched_expedited, |
541 | .call = call_rcu_sched, | |
0acc512c | 542 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 543 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
544 | .stats = NULL, |
545 | .irq_capable = 1, | |
546 | .name = "sched" | |
4b6c2cca JT |
547 | }; |
548 | ||
8e8be45e PM |
549 | /* |
550 | * RCU torture priority-boost testing. Runs one real-time thread per | |
551 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
552 | * spinning waiting for them to be invoked. If a given callback takes | |
553 | * too long to be invoked, we assume that priority inversion has occurred. | |
554 | */ | |
555 | ||
556 | struct rcu_boost_inflight { | |
557 | struct rcu_head rcu; | |
558 | int inflight; | |
559 | }; | |
560 | ||
561 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
562 | { | |
563 | struct rcu_boost_inflight *rbip = | |
564 | container_of(head, struct rcu_boost_inflight, rcu); | |
565 | ||
566 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
567 | rbip->inflight = 0; | |
568 | } | |
569 | ||
570 | static int rcu_torture_boost(void *arg) | |
571 | { | |
572 | unsigned long call_rcu_time; | |
573 | unsigned long endtime; | |
574 | unsigned long oldstarttime; | |
575 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
576 | struct sched_param sp; | |
577 | ||
5ccf60f2 | 578 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
579 | |
580 | /* Set real-time priority. */ | |
581 | sp.sched_priority = 1; | |
582 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 583 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
584 | n_rcu_torture_boost_rterror++; |
585 | } | |
586 | ||
561190e3 | 587 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
588 | /* Each pass through the following loop does one boost-test cycle. */ |
589 | do { | |
590 | /* Wait for the next test interval. */ | |
591 | oldstarttime = boost_starttime; | |
93898fb1 | 592 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 593 | schedule_timeout_interruptible(oldstarttime - jiffies); |
8e8be45e PM |
594 | rcu_stutter_wait("rcu_torture_boost"); |
595 | if (kthread_should_stop() || | |
596 | fullstop != FULLSTOP_DONTSTOP) | |
597 | goto checkwait; | |
598 | } | |
599 | ||
600 | /* Do one boost-test interval. */ | |
601 | endtime = oldstarttime + test_boost_duration * HZ; | |
602 | call_rcu_time = jiffies; | |
93898fb1 | 603 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
604 | /* If we don't have a callback in flight, post one. */ |
605 | if (!rbi.inflight) { | |
606 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
607 | rbi.inflight = 1; | |
608 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
609 | if (jiffies - call_rcu_time > | |
610 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 611 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
612 | n_rcu_torture_boost_failure++; |
613 | } | |
614 | call_rcu_time = jiffies; | |
615 | } | |
616 | cond_resched(); | |
617 | rcu_stutter_wait("rcu_torture_boost"); | |
618 | if (kthread_should_stop() || | |
619 | fullstop != FULLSTOP_DONTSTOP) | |
620 | goto checkwait; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Set the start time of the next test interval. | |
625 | * Yes, this is vulnerable to long delays, but such | |
626 | * delays simply cause a false negative for the next | |
627 | * interval. Besides, we are running at RT priority, | |
628 | * so delays should be relatively rare. | |
629 | */ | |
ab8f11e5 PM |
630 | while (oldstarttime == boost_starttime && |
631 | !kthread_should_stop()) { | |
8e8be45e PM |
632 | if (mutex_trylock(&boost_mutex)) { |
633 | boost_starttime = jiffies + | |
634 | test_boost_interval * HZ; | |
635 | n_rcu_torture_boosts++; | |
636 | mutex_unlock(&boost_mutex); | |
637 | break; | |
638 | } | |
639 | schedule_timeout_uninterruptible(1); | |
640 | } | |
641 | ||
642 | /* Go do the stutter. */ | |
643 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
644 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
645 | ||
646 | /* Clean up and exit. */ | |
5ccf60f2 | 647 | VERBOSE_TOROUT_STRING("rcu_torture_boost task stopping"); |
f67a3356 | 648 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e PM |
649 | while (!kthread_should_stop() || rbi.inflight) |
650 | schedule_timeout_uninterruptible(1); | |
651 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 652 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
653 | return 0; |
654 | } | |
655 | ||
bf66f18e PM |
656 | /* |
657 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
658 | * bursts of calls to force_quiescent_state(), increasing the probability | |
659 | * of occurrence of some important types of race conditions. | |
660 | */ | |
661 | static int | |
662 | rcu_torture_fqs(void *arg) | |
663 | { | |
664 | unsigned long fqs_resume_time; | |
665 | int fqs_burst_remaining; | |
666 | ||
5ccf60f2 | 667 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
668 | do { |
669 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
670 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
671 | !kthread_should_stop()) { | |
bf66f18e PM |
672 | schedule_timeout_interruptible(1); |
673 | } | |
674 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
675 | while (fqs_burst_remaining > 0 && |
676 | !kthread_should_stop()) { | |
bf66f18e PM |
677 | cur_ops->fqs(); |
678 | udelay(fqs_holdoff); | |
679 | fqs_burst_remaining -= fqs_holdoff; | |
680 | } | |
681 | rcu_stutter_wait("rcu_torture_fqs"); | |
682 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 683 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task stopping"); |
f67a3356 | 684 | torture_shutdown_absorb("rcu_torture_fqs"); |
bf66f18e PM |
685 | while (!kthread_should_stop()) |
686 | schedule_timeout_uninterruptible(1); | |
687 | return 0; | |
688 | } | |
689 | ||
a241ec65 PM |
690 | /* |
691 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
692 | * for that pointed to by rcu_torture_current, freeing the old structure | |
693 | * after a series of grace periods (the "pipeline"). | |
694 | */ | |
695 | static int | |
696 | rcu_torture_writer(void *arg) | |
697 | { | |
2ec1f2d9 | 698 | bool exp; |
a241ec65 | 699 | int i; |
a241ec65 | 700 | struct rcu_torture *rp; |
2ec1f2d9 | 701 | struct rcu_torture *rp1; |
a241ec65 | 702 | struct rcu_torture *old_rp; |
51b1130e | 703 | static DEFINE_TORTURE_RANDOM(rand); |
a241ec65 | 704 | |
5ccf60f2 | 705 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
dbdf65b1 IM |
706 | set_user_nice(current, 19); |
707 | ||
a241ec65 PM |
708 | do { |
709 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
710 | rp = rcu_torture_alloc(); |
711 | if (rp == NULL) | |
a241ec65 PM |
712 | continue; |
713 | rp->rtort_pipe_count = 0; | |
51b1130e | 714 | udelay(torture_random(&rand) & 0x3ff); |
0ddea0ea PM |
715 | old_rp = rcu_dereference_check(rcu_torture_current, |
716 | current == writer_task); | |
996417d2 | 717 | rp->rtort_mbtest = 1; |
a241ec65 | 718 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 719 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 720 | if (old_rp) { |
a241ec65 PM |
721 | i = old_rp->rtort_pipe_count; |
722 | if (i > RCU_TORTURE_PIPE_LEN) | |
723 | i = RCU_TORTURE_PIPE_LEN; | |
724 | atomic_inc(&rcu_torture_wcount[i]); | |
725 | old_rp->rtort_pipe_count++; | |
2ec1f2d9 | 726 | if (gp_normal == gp_exp) |
51b1130e | 727 | exp = !!(torture_random(&rand) & 0x80); |
2ec1f2d9 PM |
728 | else |
729 | exp = gp_exp; | |
730 | if (!exp) { | |
731 | cur_ops->deferred_free(old_rp); | |
732 | } else { | |
733 | cur_ops->exp_sync(); | |
734 | list_add(&old_rp->rtort_free, | |
735 | &rcu_torture_removed); | |
736 | list_for_each_entry_safe(rp, rp1, | |
737 | &rcu_torture_removed, | |
738 | rtort_free) { | |
739 | i = rp->rtort_pipe_count; | |
740 | if (i > RCU_TORTURE_PIPE_LEN) | |
741 | i = RCU_TORTURE_PIPE_LEN; | |
742 | atomic_inc(&rcu_torture_wcount[i]); | |
743 | if (++rp->rtort_pipe_count >= | |
744 | RCU_TORTURE_PIPE_LEN) { | |
745 | rp->rtort_mbtest = 0; | |
746 | list_del(&rp->rtort_free); | |
747 | rcu_torture_free(rp); | |
748 | } | |
749 | } | |
750 | } | |
a241ec65 | 751 | } |
4a298656 | 752 | rcutorture_record_progress(++rcu_torture_current_version); |
c9d557c1 PM |
753 | rcu_stutter_wait("rcu_torture_writer"); |
754 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 755 | VERBOSE_TOROUT_STRING("rcu_torture_writer task stopping"); |
f67a3356 | 756 | torture_shutdown_absorb("rcu_torture_writer"); |
c9d557c1 | 757 | while (!kthread_should_stop()) |
a241ec65 PM |
758 | schedule_timeout_uninterruptible(1); |
759 | return 0; | |
760 | } | |
761 | ||
b772e1dd JT |
762 | /* |
763 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
764 | * delay between calls. | |
765 | */ | |
766 | static int | |
767 | rcu_torture_fakewriter(void *arg) | |
768 | { | |
51b1130e | 769 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 770 | |
5ccf60f2 | 771 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
b772e1dd JT |
772 | set_user_nice(current, 19); |
773 | ||
774 | do { | |
51b1130e PM |
775 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
776 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 777 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 778 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 779 | cur_ops->cb_barrier(); |
2ec1f2d9 | 780 | } else if (gp_normal == gp_exp) { |
51b1130e | 781 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
782 | cur_ops->sync(); |
783 | else | |
784 | cur_ops->exp_sync(); | |
785 | } else if (gp_normal) { | |
72472a02 | 786 | cur_ops->sync(); |
2ec1f2d9 PM |
787 | } else { |
788 | cur_ops->exp_sync(); | |
789 | } | |
c9d557c1 PM |
790 | rcu_stutter_wait("rcu_torture_fakewriter"); |
791 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd | 792 | |
5ccf60f2 | 793 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task stopping"); |
f67a3356 | 794 | torture_shutdown_absorb("rcu_torture_fakewriter"); |
c9d557c1 | 795 | while (!kthread_should_stop()) |
b772e1dd JT |
796 | schedule_timeout_uninterruptible(1); |
797 | return 0; | |
798 | } | |
799 | ||
91afaf30 PM |
800 | void rcutorture_trace_dump(void) |
801 | { | |
802 | static atomic_t beenhere = ATOMIC_INIT(0); | |
803 | ||
804 | if (atomic_read(&beenhere)) | |
805 | return; | |
806 | if (atomic_xchg(&beenhere, 1) != 0) | |
807 | return; | |
91afaf30 PM |
808 | ftrace_dump(DUMP_ALL); |
809 | } | |
810 | ||
0729fbf3 PM |
811 | /* |
812 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
813 | * incrementing the corresponding element of the pipeline array. The | |
814 | * counter in the element should never be greater than 1, otherwise, the | |
815 | * RCU implementation is broken. | |
816 | */ | |
817 | static void rcu_torture_timer(unsigned long unused) | |
818 | { | |
819 | int idx; | |
820 | int completed; | |
52494535 | 821 | int completed_end; |
51b1130e | 822 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
823 | static DEFINE_SPINLOCK(rand_lock); |
824 | struct rcu_torture *p; | |
825 | int pipe_count; | |
52494535 | 826 | unsigned long long ts; |
0729fbf3 PM |
827 | |
828 | idx = cur_ops->readlock(); | |
829 | completed = cur_ops->completed(); | |
e4aa0da3 | 830 | ts = rcu_trace_clock_local(); |
632ee200 | 831 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
832 | rcu_read_lock_bh_held() || |
833 | rcu_read_lock_sched_held() || | |
834 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
835 | if (p == NULL) { |
836 | /* Leave because rcu_torture_writer is not yet underway */ | |
837 | cur_ops->readunlock(idx); | |
838 | return; | |
839 | } | |
840 | if (p->rtort_mbtest == 0) | |
841 | atomic_inc(&n_rcu_torture_mberror); | |
842 | spin_lock(&rand_lock); | |
0acc512c | 843 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
844 | n_rcu_torture_timers++; |
845 | spin_unlock(&rand_lock); | |
846 | preempt_disable(); | |
847 | pipe_count = p->rtort_pipe_count; | |
848 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
849 | /* Should not happen, but... */ | |
850 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
851 | } | |
52494535 PM |
852 | completed_end = cur_ops->completed(); |
853 | if (pipe_count > 1) { | |
52494535 PM |
854 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
855 | completed, completed_end); | |
91afaf30 | 856 | rcutorture_trace_dump(); |
52494535 | 857 | } |
dd17c8f7 | 858 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 859 | completed = completed_end - completed; |
0729fbf3 PM |
860 | if (completed > RCU_TORTURE_PIPE_LEN) { |
861 | /* Should not happen, but... */ | |
862 | completed = RCU_TORTURE_PIPE_LEN; | |
863 | } | |
dd17c8f7 | 864 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
865 | preempt_enable(); |
866 | cur_ops->readunlock(idx); | |
867 | } | |
868 | ||
a241ec65 PM |
869 | /* |
870 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
871 | * incrementing the corresponding element of the pipeline array. The | |
872 | * counter in the element should never be greater than 1, otherwise, the | |
873 | * RCU implementation is broken. | |
874 | */ | |
875 | static int | |
876 | rcu_torture_reader(void *arg) | |
877 | { | |
878 | int completed; | |
52494535 | 879 | int completed_end; |
72e9bb54 | 880 | int idx; |
51b1130e | 881 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
882 | struct rcu_torture *p; |
883 | int pipe_count; | |
0729fbf3 | 884 | struct timer_list t; |
52494535 | 885 | unsigned long long ts; |
a241ec65 | 886 | |
5ccf60f2 | 887 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
dbdf65b1 | 888 | set_user_nice(current, 19); |
0acc512c | 889 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 890 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 891 | |
a241ec65 | 892 | do { |
0acc512c | 893 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 894 | if (!timer_pending(&t)) |
6155fec9 | 895 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 896 | } |
72e9bb54 PM |
897 | idx = cur_ops->readlock(); |
898 | completed = cur_ops->completed(); | |
e4aa0da3 | 899 | ts = rcu_trace_clock_local(); |
632ee200 | 900 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
901 | rcu_read_lock_bh_held() || |
902 | rcu_read_lock_sched_held() || | |
903 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
904 | if (p == NULL) { |
905 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 906 | cur_ops->readunlock(idx); |
a241ec65 PM |
907 | schedule_timeout_interruptible(HZ); |
908 | continue; | |
909 | } | |
996417d2 PM |
910 | if (p->rtort_mbtest == 0) |
911 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 912 | cur_ops->read_delay(&rand); |
a241ec65 PM |
913 | preempt_disable(); |
914 | pipe_count = p->rtort_pipe_count; | |
915 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
916 | /* Should not happen, but... */ | |
917 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
918 | } | |
52494535 PM |
919 | completed_end = cur_ops->completed(); |
920 | if (pipe_count > 1) { | |
52494535 PM |
921 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
922 | ts, completed, completed_end); | |
91afaf30 | 923 | rcutorture_trace_dump(); |
52494535 | 924 | } |
dd17c8f7 | 925 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 926 | completed = completed_end - completed; |
a241ec65 PM |
927 | if (completed > RCU_TORTURE_PIPE_LEN) { |
928 | /* Should not happen, but... */ | |
929 | completed = RCU_TORTURE_PIPE_LEN; | |
930 | } | |
dd17c8f7 | 931 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 932 | preempt_enable(); |
72e9bb54 | 933 | cur_ops->readunlock(idx); |
a241ec65 | 934 | schedule(); |
c9d557c1 PM |
935 | rcu_stutter_wait("rcu_torture_reader"); |
936 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 937 | VERBOSE_TOROUT_STRING("rcu_torture_reader task stopping"); |
f67a3356 | 938 | torture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 939 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 940 | del_timer_sync(&t); |
c9d557c1 | 941 | while (!kthread_should_stop()) |
a241ec65 PM |
942 | schedule_timeout_uninterruptible(1); |
943 | return 0; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Create an RCU-torture statistics message in the specified buffer. | |
948 | */ | |
d1008950 | 949 | static void |
a241ec65 PM |
950 | rcu_torture_printk(char *page) |
951 | { | |
a241ec65 PM |
952 | int cpu; |
953 | int i; | |
954 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
955 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
956 | ||
0a945022 | 957 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
958 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
959 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
960 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
961 | } | |
962 | } | |
963 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
964 | if (pipesummary[i] != 0) | |
965 | break; | |
966 | } | |
d1008950 CG |
967 | page += sprintf(page, "%s%s ", torture_type, TORTURE_FLAG); |
968 | page += sprintf(page, | |
5cf05ad7 | 969 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", |
a241ec65 PM |
970 | rcu_torture_current, |
971 | rcu_torture_current_version, | |
972 | list_empty(&rcu_torture_freelist), | |
973 | atomic_read(&n_rcu_torture_alloc), | |
974 | atomic_read(&n_rcu_torture_alloc_fail), | |
5cf05ad7 | 975 | atomic_read(&n_rcu_torture_free)); |
d1008950 | 976 | page += sprintf(page, "rtmbe: %d rtbke: %ld rtbre: %ld ", |
0729fbf3 | 977 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e | 978 | n_rcu_torture_boost_ktrerror, |
5cf05ad7 | 979 | n_rcu_torture_boost_rterror); |
d1008950 | 980 | page += sprintf(page, "rtbf: %ld rtb: %ld nt: %ld ", |
8e8be45e PM |
981 | n_rcu_torture_boost_failure, |
982 | n_rcu_torture_boosts, | |
5cf05ad7 | 983 | n_rcu_torture_timers); |
2e9e8081 | 984 | page = torture_onoff_stats(page); |
d1008950 | 985 | page += sprintf(page, "barrier: %ld/%ld:%ld", |
fae4b54f PM |
986 | n_barrier_successes, |
987 | n_barrier_attempts, | |
988 | n_rcu_torture_barrier_error); | |
d1008950 | 989 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); |
8e8be45e | 990 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 991 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
992 | n_rcu_torture_boost_ktrerror != 0 || |
993 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
994 | n_rcu_torture_boost_failure != 0 || |
995 | i > 1) { | |
d1008950 | 996 | page += sprintf(page, "!!! "); |
996417d2 | 997 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 998 | WARN_ON_ONCE(1); |
996417d2 | 999 | } |
d1008950 | 1000 | page += sprintf(page, "Reader Pipe: "); |
a241ec65 | 1001 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1002 | page += sprintf(page, " %ld", pipesummary[i]); |
1003 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1004 | page += sprintf(page, "Reader Batch: "); | |
72e9bb54 | 1005 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1006 | page += sprintf(page, " %ld", batchsummary[i]); |
1007 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1008 | page += sprintf(page, "Free-Block Circulation: "); | |
a241ec65 | 1009 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
d1008950 | 1010 | page += sprintf(page, " %d", |
a241ec65 PM |
1011 | atomic_read(&rcu_torture_wcount[i])); |
1012 | } | |
d1008950 | 1013 | page += sprintf(page, "\n"); |
c8e5b163 | 1014 | if (cur_ops->stats) |
d1008950 | 1015 | cur_ops->stats(page); |
a241ec65 PM |
1016 | } |
1017 | ||
1018 | /* | |
1019 | * Print torture statistics. Caller must ensure that there is only | |
1020 | * one call to this function at a given time!!! This is normally | |
1021 | * accomplished by relying on the module system to only have one copy | |
1022 | * of the module loaded, and then by giving the rcu_torture_stats | |
1023 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1024 | * thread is not running). | |
1025 | */ | |
1026 | static void | |
1027 | rcu_torture_stats_print(void) | |
1028 | { | |
d1008950 CG |
1029 | int size = nr_cpu_ids * 200 + 8192; |
1030 | char *buf; | |
a241ec65 | 1031 | |
d1008950 CG |
1032 | buf = kmalloc(size, GFP_KERNEL); |
1033 | if (!buf) { | |
1034 | pr_err("rcu-torture: Out of memory, need: %d", size); | |
1035 | return; | |
1036 | } | |
1037 | rcu_torture_printk(buf); | |
1038 | pr_alert("%s", buf); | |
1039 | kfree(buf); | |
a241ec65 PM |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Periodically prints torture statistics, if periodic statistics printing | |
1044 | * was specified via the stat_interval module parameter. | |
1045 | * | |
1046 | * No need to worry about fullstop here, since this one doesn't reference | |
1047 | * volatile state or register callbacks. | |
1048 | */ | |
1049 | static int | |
1050 | rcu_torture_stats(void *arg) | |
1051 | { | |
5ccf60f2 | 1052 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1053 | do { |
1054 | schedule_timeout_interruptible(stat_interval * HZ); | |
1055 | rcu_torture_stats_print(); | |
f67a3356 | 1056 | torture_shutdown_absorb("rcu_torture_stats"); |
c9d557c1 | 1057 | } while (!kthread_should_stop()); |
5ccf60f2 | 1058 | VERBOSE_TOROUT_STRING("rcu_torture_stats task stopping"); |
a241ec65 PM |
1059 | return 0; |
1060 | } | |
1061 | ||
d120f65f PM |
1062 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1063 | * threads periodically. | |
1064 | */ | |
1065 | static int | |
1066 | rcu_torture_stutter(void *arg) | |
1067 | { | |
5ccf60f2 | 1068 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task started"); |
d120f65f PM |
1069 | do { |
1070 | schedule_timeout_interruptible(stutter * HZ); | |
1071 | stutter_pause_test = 1; | |
c9d557c1 | 1072 | if (!kthread_should_stop()) |
d120f65f PM |
1073 | schedule_timeout_interruptible(stutter * HZ); |
1074 | stutter_pause_test = 0; | |
f67a3356 | 1075 | torture_shutdown_absorb("rcu_torture_stutter"); |
c9d557c1 | 1076 | } while (!kthread_should_stop()); |
5ccf60f2 | 1077 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task stopping"); |
d120f65f PM |
1078 | return 0; |
1079 | } | |
1080 | ||
95c38322 | 1081 | static inline void |
e66c33d5 | 1082 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1083 | { |
2caa1e44 PM |
1084 | pr_alert("%s" TORTURE_FLAG |
1085 | "--- %s: nreaders=%d nfakewriters=%d " | |
1086 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1087 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1088 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1089 | "test_boost=%d/%d test_boost_interval=%d " | |
1090 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1091 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1092 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1093 | "onoff_interval=%d onoff_holdoff=%d\n", |
1094 | torture_type, tag, nrealreaders, nfakewriters, | |
1095 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1096 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1097 | test_boost, cur_ops->can_boost, | |
1098 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1099 | stall_cpu, stall_cpu_holdoff, |
1100 | n_barrier_cbs, | |
2caa1e44 | 1101 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1102 | } |
1103 | ||
8e8be45e | 1104 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1105 | .notifier_call = rcutorture_shutdown_notify, |
1106 | }; | |
1107 | ||
8e8be45e PM |
1108 | static void rcutorture_booster_cleanup(int cpu) |
1109 | { | |
1110 | struct task_struct *t; | |
1111 | ||
1112 | if (boost_tasks[cpu] == NULL) | |
1113 | return; | |
1114 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1115 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_boost task"); |
8e8be45e PM |
1116 | t = boost_tasks[cpu]; |
1117 | boost_tasks[cpu] = NULL; | |
1118 | mutex_unlock(&boost_mutex); | |
1119 | ||
1120 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1121 | kthread_stop(t); | |
37e377d2 | 1122 | boost_tasks[cpu] = NULL; |
8e8be45e PM |
1123 | } |
1124 | ||
1125 | static int rcutorture_booster_init(int cpu) | |
1126 | { | |
1127 | int retval; | |
1128 | ||
1129 | if (boost_tasks[cpu] != NULL) | |
1130 | return 0; /* Already created, nothing more to do. */ | |
1131 | ||
1132 | /* Don't allow time recalculation while creating a new task. */ | |
1133 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1134 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1135 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1136 | cpu_to_node(cpu), | |
1137 | "rcu_torture_boost"); | |
8e8be45e PM |
1138 | if (IS_ERR(boost_tasks[cpu])) { |
1139 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1140 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1141 | n_rcu_torture_boost_ktrerror++; |
1142 | boost_tasks[cpu] = NULL; | |
1143 | mutex_unlock(&boost_mutex); | |
1144 | return retval; | |
1145 | } | |
1146 | kthread_bind(boost_tasks[cpu], cpu); | |
1147 | wake_up_process(boost_tasks[cpu]); | |
1148 | mutex_unlock(&boost_mutex); | |
1149 | return 0; | |
1150 | } | |
1151 | ||
d5f546d8 PM |
1152 | /* |
1153 | * Cause the rcutorture test to shutdown the system after the test has | |
1154 | * run for the time specified by the shutdown_secs module parameter. | |
1155 | */ | |
1156 | static int | |
1157 | rcu_torture_shutdown(void *arg) | |
1158 | { | |
1159 | long delta; | |
1160 | unsigned long jiffies_snap; | |
1161 | ||
5ccf60f2 | 1162 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task started"); |
d5f546d8 PM |
1163 | jiffies_snap = ACCESS_ONCE(jiffies); |
1164 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1165 | !kthread_should_stop()) { | |
1166 | delta = shutdown_time - jiffies_snap; | |
1167 | if (verbose) | |
2caa1e44 PM |
1168 | pr_alert("%s" TORTURE_FLAG |
1169 | "rcu_torture_shutdown task: %lu jiffies remaining\n", | |
1170 | torture_type, delta); | |
d5f546d8 PM |
1171 | schedule_timeout_interruptible(delta); |
1172 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1173 | } | |
b58bdcca | 1174 | if (kthread_should_stop()) { |
5ccf60f2 | 1175 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task stopping"); |
d5f546d8 PM |
1176 | return 0; |
1177 | } | |
1178 | ||
1179 | /* OK, shut down the system. */ | |
1180 | ||
5ccf60f2 | 1181 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task shutting down system"); |
d5f546d8 PM |
1182 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ |
1183 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1184 | kernel_power_off(); /* Shut down the system. */ | |
1185 | return 0; | |
1186 | } | |
1187 | ||
c13f3757 PM |
1188 | /* |
1189 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1190 | * induces a CPU stall for the time specified by stall_cpu. | |
1191 | */ | |
49fb4c62 | 1192 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1193 | { |
1194 | unsigned long stop_at; | |
1195 | ||
5ccf60f2 | 1196 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1197 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1198 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1199 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1200 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1201 | } |
1202 | if (!kthread_should_stop()) { | |
1203 | stop_at = get_seconds() + stall_cpu; | |
1204 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1205 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1206 | rcu_read_lock(); |
1207 | preempt_disable(); | |
1208 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1209 | continue; /* Induce RCU CPU stall warning. */ | |
1210 | preempt_enable(); | |
1211 | rcu_read_unlock(); | |
2caa1e44 | 1212 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1213 | } |
f67a3356 | 1214 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1215 | while (!kthread_should_stop()) |
1216 | schedule_timeout_interruptible(10 * HZ); | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1221 | static int __init rcu_torture_stall_init(void) | |
1222 | { | |
1223 | int ret; | |
1224 | ||
1225 | if (stall_cpu <= 0) | |
1226 | return 0; | |
1227 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1228 | if (IS_ERR(stall_task)) { | |
1229 | ret = PTR_ERR(stall_task); | |
1230 | stall_task = NULL; | |
1231 | return ret; | |
1232 | } | |
3808dc9f | 1233 | torture_shuffle_task_register(stall_task); |
c13f3757 PM |
1234 | return 0; |
1235 | } | |
1236 | ||
1237 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1238 | static void rcu_torture_stall_cleanup(void) | |
1239 | { | |
1240 | if (stall_task == NULL) | |
1241 | return; | |
5ccf60f2 | 1242 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stall_task."); |
c13f3757 | 1243 | kthread_stop(stall_task); |
37e377d2 | 1244 | stall_task = NULL; |
c13f3757 PM |
1245 | } |
1246 | ||
fae4b54f PM |
1247 | /* Callback function for RCU barrier testing. */ |
1248 | void rcu_torture_barrier_cbf(struct rcu_head *rcu) | |
1249 | { | |
1250 | atomic_inc(&barrier_cbs_invoked); | |
1251 | } | |
1252 | ||
1253 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1254 | static int rcu_torture_barrier_cbs(void *arg) | |
1255 | { | |
1256 | long myid = (long)arg; | |
c6ebcbb6 | 1257 | bool lastphase = 0; |
78e4bc34 | 1258 | bool newphase; |
fae4b54f PM |
1259 | struct rcu_head rcu; |
1260 | ||
1261 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1262 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
fae4b54f PM |
1263 | set_user_nice(current, 19); |
1264 | do { | |
1265 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 PM |
1266 | (newphase = |
1267 | ACCESS_ONCE(barrier_phase)) != lastphase || | |
fae4b54f PM |
1268 | kthread_should_stop() || |
1269 | fullstop != FULLSTOP_DONTSTOP); | |
78e4bc34 | 1270 | lastphase = newphase; |
c6ebcbb6 | 1271 | smp_mb(); /* ensure barrier_phase load before ->call(). */ |
fae4b54f PM |
1272 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) |
1273 | break; | |
1274 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1275 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1276 | wake_up(&barrier_wq); | |
1277 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1278 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task stopping"); |
f67a3356 | 1279 | torture_shutdown_absorb("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1280 | while (!kthread_should_stop()) |
1281 | schedule_timeout_interruptible(1); | |
1282 | cur_ops->cb_barrier(); | |
1283 | destroy_rcu_head_on_stack(&rcu); | |
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1288 | static int rcu_torture_barrier(void *arg) | |
1289 | { | |
1290 | int i; | |
1291 | ||
5ccf60f2 | 1292 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1293 | do { |
1294 | atomic_set(&barrier_cbs_invoked, 0); | |
1295 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
c6ebcbb6 PM |
1296 | smp_mb(); /* Ensure barrier_phase after prior assignments. */ |
1297 | barrier_phase = !barrier_phase; | |
fae4b54f PM |
1298 | for (i = 0; i < n_barrier_cbs; i++) |
1299 | wake_up(&barrier_cbs_wq[i]); | |
1300 | wait_event(barrier_wq, | |
1301 | atomic_read(&barrier_cbs_count) == 0 || | |
1302 | kthread_should_stop() || | |
1303 | fullstop != FULLSTOP_DONTSTOP); | |
1304 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1305 | break; | |
1306 | n_barrier_attempts++; | |
78e4bc34 | 1307 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1308 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1309 | n_rcu_torture_barrier_error++; | |
1310 | WARN_ON_ONCE(1); | |
1311 | } | |
1312 | n_barrier_successes++; | |
1313 | schedule_timeout_interruptible(HZ / 10); | |
1314 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1315 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task stopping"); |
f67a3356 | 1316 | torture_shutdown_absorb("rcu_torture_barrier"); |
fae4b54f PM |
1317 | while (!kthread_should_stop()) |
1318 | schedule_timeout_interruptible(1); | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | /* Initialize RCU barrier testing. */ | |
1323 | static int rcu_torture_barrier_init(void) | |
1324 | { | |
1325 | int i; | |
1326 | int ret; | |
1327 | ||
1328 | if (n_barrier_cbs == 0) | |
1329 | return 0; | |
1330 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1331 | pr_alert("%s" TORTURE_FLAG |
1332 | " Call or barrier ops missing for %s,\n", | |
1333 | torture_type, cur_ops->name); | |
1334 | pr_alert("%s" TORTURE_FLAG | |
1335 | " RCU barrier testing omitted from run.\n", | |
1336 | torture_type); | |
fae4b54f PM |
1337 | return 0; |
1338 | } | |
1339 | atomic_set(&barrier_cbs_count, 0); | |
1340 | atomic_set(&barrier_cbs_invoked, 0); | |
1341 | barrier_cbs_tasks = | |
1342 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1343 | GFP_KERNEL); | |
1344 | barrier_cbs_wq = | |
1345 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1346 | GFP_KERNEL); | |
de5e6437 | 1347 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1348 | return -ENOMEM; |
1349 | for (i = 0; i < n_barrier_cbs; i++) { | |
1350 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
1351 | barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, | |
9059c940 | 1352 | (void *)(long)i, |
fae4b54f PM |
1353 | "rcu_torture_barrier_cbs"); |
1354 | if (IS_ERR(barrier_cbs_tasks[i])) { | |
1355 | ret = PTR_ERR(barrier_cbs_tasks[i]); | |
5ccf60f2 | 1356 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); |
fae4b54f PM |
1357 | barrier_cbs_tasks[i] = NULL; |
1358 | return ret; | |
1359 | } | |
3808dc9f | 1360 | torture_shuffle_task_register(barrier_cbs_tasks[i]); |
fae4b54f PM |
1361 | } |
1362 | barrier_task = kthread_run(rcu_torture_barrier, NULL, | |
1363 | "rcu_torture_barrier"); | |
1364 | if (IS_ERR(barrier_task)) { | |
1365 | ret = PTR_ERR(barrier_task); | |
5ccf60f2 | 1366 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier"); |
fae4b54f PM |
1367 | barrier_task = NULL; |
1368 | } | |
3808dc9f | 1369 | torture_shuffle_task_register(barrier_task); |
fae4b54f PM |
1370 | return 0; |
1371 | } | |
1372 | ||
1373 | /* Clean up after RCU barrier testing. */ | |
1374 | static void rcu_torture_barrier_cleanup(void) | |
1375 | { | |
1376 | int i; | |
1377 | ||
1378 | if (barrier_task != NULL) { | |
5ccf60f2 | 1379 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier task"); |
fae4b54f PM |
1380 | kthread_stop(barrier_task); |
1381 | barrier_task = NULL; | |
1382 | } | |
1383 | if (barrier_cbs_tasks != NULL) { | |
1384 | for (i = 0; i < n_barrier_cbs; i++) { | |
1385 | if (barrier_cbs_tasks[i] != NULL) { | |
5ccf60f2 | 1386 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier_cbs task"); |
fae4b54f PM |
1387 | kthread_stop(barrier_cbs_tasks[i]); |
1388 | barrier_cbs_tasks[i] = NULL; | |
1389 | } | |
1390 | } | |
1391 | kfree(barrier_cbs_tasks); | |
1392 | barrier_cbs_tasks = NULL; | |
1393 | } | |
1394 | if (barrier_cbs_wq != NULL) { | |
1395 | kfree(barrier_cbs_wq); | |
1396 | barrier_cbs_wq = NULL; | |
1397 | } | |
1398 | } | |
1399 | ||
8e8be45e PM |
1400 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1401 | unsigned long action, void *hcpu) | |
1402 | { | |
1403 | long cpu = (long)hcpu; | |
1404 | ||
1405 | switch (action) { | |
1406 | case CPU_ONLINE: | |
1407 | case CPU_DOWN_FAILED: | |
1408 | (void)rcutorture_booster_init(cpu); | |
1409 | break; | |
1410 | case CPU_DOWN_PREPARE: | |
1411 | rcutorture_booster_cleanup(cpu); | |
1412 | break; | |
1413 | default: | |
1414 | break; | |
1415 | } | |
1416 | return NOTIFY_OK; | |
1417 | } | |
1418 | ||
1419 | static struct notifier_block rcutorture_cpu_nb = { | |
1420 | .notifier_call = rcutorture_cpu_notify, | |
1421 | }; | |
1422 | ||
a241ec65 PM |
1423 | static void |
1424 | rcu_torture_cleanup(void) | |
1425 | { | |
1426 | int i; | |
1427 | ||
343e9099 | 1428 | mutex_lock(&fullstop_mutex); |
4a298656 | 1429 | rcutorture_record_test_transition(); |
c9d557c1 | 1430 | if (fullstop == FULLSTOP_SHUTDOWN) { |
2caa1e44 | 1431 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 1432 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
343e9099 | 1433 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1434 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1435 | if (cur_ops->cb_barrier != NULL) |
1436 | cur_ops->cb_barrier(); | |
1437 | return; | |
1438 | } | |
c9d557c1 | 1439 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1440 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1441 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
3808dc9f PM |
1442 | |
1443 | torture_shuffle_cleanup(); /* Must be first task cleaned up. */ | |
fae4b54f | 1444 | rcu_torture_barrier_cleanup(); |
c13f3757 | 1445 | rcu_torture_stall_cleanup(); |
d120f65f | 1446 | if (stutter_task) { |
5ccf60f2 | 1447 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stutter task"); |
d120f65f PM |
1448 | kthread_stop(stutter_task); |
1449 | } | |
1450 | stutter_task = NULL; | |
d84f5203 | 1451 | |
c8e5b163 | 1452 | if (writer_task) { |
5ccf60f2 | 1453 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_writer task"); |
a241ec65 PM |
1454 | kthread_stop(writer_task); |
1455 | } | |
1456 | writer_task = NULL; | |
1457 | ||
c8e5b163 | 1458 | if (reader_tasks) { |
a241ec65 | 1459 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1460 | if (reader_tasks[i]) { |
5ccf60f2 | 1461 | VERBOSE_TOROUT_STRING( |
a241ec65 PM |
1462 | "Stopping rcu_torture_reader task"); |
1463 | kthread_stop(reader_tasks[i]); | |
1464 | } | |
1465 | reader_tasks[i] = NULL; | |
1466 | } | |
1467 | kfree(reader_tasks); | |
1468 | reader_tasks = NULL; | |
1469 | } | |
1470 | rcu_torture_current = NULL; | |
1471 | ||
c8e5b163 | 1472 | if (fakewriter_tasks) { |
b772e1dd | 1473 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1474 | if (fakewriter_tasks[i]) { |
5ccf60f2 | 1475 | VERBOSE_TOROUT_STRING( |
b772e1dd JT |
1476 | "Stopping rcu_torture_fakewriter task"); |
1477 | kthread_stop(fakewriter_tasks[i]); | |
1478 | } | |
1479 | fakewriter_tasks[i] = NULL; | |
1480 | } | |
1481 | kfree(fakewriter_tasks); | |
1482 | fakewriter_tasks = NULL; | |
1483 | } | |
1484 | ||
c8e5b163 | 1485 | if (stats_task) { |
5ccf60f2 | 1486 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stats task"); |
a241ec65 PM |
1487 | kthread_stop(stats_task); |
1488 | } | |
1489 | stats_task = NULL; | |
1490 | ||
bf66f18e | 1491 | if (fqs_task) { |
5ccf60f2 | 1492 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_fqs task"); |
bf66f18e PM |
1493 | kthread_stop(fqs_task); |
1494 | } | |
1495 | fqs_task = NULL; | |
8e8be45e PM |
1496 | if ((test_boost == 1 && cur_ops->can_boost) || |
1497 | test_boost == 2) { | |
1498 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1499 | for_each_possible_cpu(i) | |
1500 | rcutorture_booster_cleanup(i); | |
1501 | } | |
d5f546d8 | 1502 | if (shutdown_task != NULL) { |
5ccf60f2 | 1503 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_shutdown task"); |
d5f546d8 PM |
1504 | kthread_stop(shutdown_task); |
1505 | } | |
37e377d2 | 1506 | shutdown_task = NULL; |
2e9e8081 | 1507 | torture_onoff_cleanup(); |
bf66f18e | 1508 | |
a241ec65 | 1509 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1510 | |
1511 | if (cur_ops->cb_barrier != NULL) | |
1512 | cur_ops->cb_barrier(); | |
a241ec65 | 1513 | |
a241ec65 | 1514 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1515 | |
fae4b54f | 1516 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1517 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1518 | else if (torture_onoff_failures()) |
091541bb PM |
1519 | rcu_torture_print_module_parms(cur_ops, |
1520 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1521 | else |
8e8be45e | 1522 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1523 | } |
1524 | ||
d2818df1 PM |
1525 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1526 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1527 | { | |
1528 | } | |
1529 | ||
1530 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1531 | { | |
1532 | /* | |
1533 | * This -might- happen due to race conditions, but is unlikely. | |
1534 | * The scenario that leads to this happening is that the | |
1535 | * first of the pair of duplicate callbacks is queued, | |
1536 | * someone else starts a grace period that includes that | |
1537 | * callback, then the second of the pair must wait for the | |
1538 | * next grace period. Unlikely, but can happen. If it | |
1539 | * does happen, the debug-objects subsystem won't have splatted. | |
1540 | */ | |
1541 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1542 | } | |
1543 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1544 | ||
1545 | /* | |
1546 | * Verify that double-free causes debug-objects to complain, but only | |
1547 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1548 | * cannot be carried out. | |
1549 | */ | |
1550 | static void rcu_test_debug_objects(void) | |
1551 | { | |
1552 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1553 | struct rcu_head rh1; | |
1554 | struct rcu_head rh2; | |
1555 | ||
1556 | init_rcu_head_on_stack(&rh1); | |
1557 | init_rcu_head_on_stack(&rh2); | |
1558 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1559 | ||
1560 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1561 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1562 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1563 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1564 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1565 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1566 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1567 | local_irq_enable(); | |
1568 | rcu_read_unlock(); | |
1569 | preempt_enable(); | |
1570 | ||
1571 | /* Wait for them all to get done so we can safely return. */ | |
1572 | rcu_barrier(); | |
1573 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1574 | destroy_rcu_head_on_stack(&rh1); | |
1575 | destroy_rcu_head_on_stack(&rh2); | |
1576 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1577 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1578 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1579 | } | |
1580 | ||
6f8bc500 | 1581 | static int __init |
a241ec65 PM |
1582 | rcu_torture_init(void) |
1583 | { | |
1584 | int i; | |
1585 | int cpu; | |
1586 | int firsterr = 0; | |
fae4b54f | 1587 | int retval; |
2ec1f2d9 PM |
1588 | static struct rcu_torture_ops *torture_ops[] = { |
1589 | &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, | |
1590 | }; | |
a241ec65 | 1591 | |
343e9099 PM |
1592 | mutex_lock(&fullstop_mutex); |
1593 | ||
a241ec65 | 1594 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1595 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1596 | cur_ops = torture_ops[i]; |
ade5fb81 | 1597 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1598 | break; |
72e9bb54 | 1599 | } |
ade5fb81 | 1600 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1601 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1602 | torture_type); | |
1603 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1604 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1605 | pr_alert(" %s", torture_ops[i]->name); |
1606 | pr_alert("\n"); | |
343e9099 | 1607 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 1608 | return -EINVAL; |
72e9bb54 | 1609 | } |
bf66f18e | 1610 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1611 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1612 | fqs_duration = 0; |
1613 | } | |
c8e5b163 | 1614 | if (cur_ops->init) |
72e9bb54 PM |
1615 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1616 | ||
a241ec65 PM |
1617 | if (nreaders >= 0) |
1618 | nrealreaders = nreaders; | |
1619 | else | |
1620 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 1621 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 1622 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
1623 | |
1624 | /* Set up the freelist. */ | |
1625 | ||
1626 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1627 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1628 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1629 | list_add_tail(&rcu_tortures[i].rtort_free, |
1630 | &rcu_torture_freelist); | |
1631 | } | |
1632 | ||
1633 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1634 | ||
1635 | rcu_torture_current = NULL; | |
1636 | rcu_torture_current_version = 0; | |
1637 | atomic_set(&n_rcu_torture_alloc, 0); | |
1638 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1639 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1640 | atomic_set(&n_rcu_torture_mberror, 0); |
1641 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1642 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1643 | n_rcu_torture_boost_ktrerror = 0; |
1644 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1645 | n_rcu_torture_boost_failure = 0; |
1646 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1647 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1648 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1649 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1650 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1651 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1652 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | /* Start up the kthreads. */ | |
1657 | ||
5ccf60f2 | 1658 | VERBOSE_TOROUT_STRING("Creating rcu_torture_writer task"); |
60f53782 PM |
1659 | writer_task = kthread_create(rcu_torture_writer, NULL, |
1660 | "rcu_torture_writer"); | |
a241ec65 PM |
1661 | if (IS_ERR(writer_task)) { |
1662 | firsterr = PTR_ERR(writer_task); | |
5ccf60f2 | 1663 | VERBOSE_TOROUT_ERRSTRING("Failed to create writer"); |
a241ec65 PM |
1664 | writer_task = NULL; |
1665 | goto unwind; | |
1666 | } | |
3808dc9f | 1667 | torture_shuffle_task_register(writer_task); |
60f53782 | 1668 | wake_up_process(writer_task); |
b772e1dd | 1669 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1670 | GFP_KERNEL); |
b772e1dd | 1671 | if (fakewriter_tasks == NULL) { |
5ccf60f2 | 1672 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
b772e1dd JT |
1673 | firsterr = -ENOMEM; |
1674 | goto unwind; | |
1675 | } | |
1676 | for (i = 0; i < nfakewriters; i++) { | |
5ccf60f2 | 1677 | VERBOSE_TOROUT_STRING("Creating rcu_torture_fakewriter task"); |
b772e1dd | 1678 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, |
a71fca58 | 1679 | "rcu_torture_fakewriter"); |
b772e1dd JT |
1680 | if (IS_ERR(fakewriter_tasks[i])) { |
1681 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
5ccf60f2 | 1682 | VERBOSE_TOROUT_ERRSTRING("Failed to create fakewriter"); |
b772e1dd JT |
1683 | fakewriter_tasks[i] = NULL; |
1684 | goto unwind; | |
1685 | } | |
3808dc9f | 1686 | torture_shuffle_task_register(fakewriter_tasks[i]); |
b772e1dd | 1687 | } |
2860aaba | 1688 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1689 | GFP_KERNEL); |
1690 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1691 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1692 | firsterr = -ENOMEM; |
1693 | goto unwind; | |
1694 | } | |
1695 | for (i = 0; i < nrealreaders; i++) { | |
5ccf60f2 | 1696 | VERBOSE_TOROUT_STRING("Creating rcu_torture_reader task"); |
a241ec65 PM |
1697 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, |
1698 | "rcu_torture_reader"); | |
1699 | if (IS_ERR(reader_tasks[i])) { | |
1700 | firsterr = PTR_ERR(reader_tasks[i]); | |
5ccf60f2 | 1701 | VERBOSE_TOROUT_ERRSTRING("Failed to create reader"); |
a241ec65 PM |
1702 | reader_tasks[i] = NULL; |
1703 | goto unwind; | |
1704 | } | |
3808dc9f | 1705 | torture_shuffle_task_register(reader_tasks[i]); |
a241ec65 PM |
1706 | } |
1707 | if (stat_interval > 0) { | |
5ccf60f2 | 1708 | VERBOSE_TOROUT_STRING("Creating rcu_torture_stats task"); |
a241ec65 PM |
1709 | stats_task = kthread_run(rcu_torture_stats, NULL, |
1710 | "rcu_torture_stats"); | |
1711 | if (IS_ERR(stats_task)) { | |
1712 | firsterr = PTR_ERR(stats_task); | |
5ccf60f2 | 1713 | VERBOSE_TOROUT_ERRSTRING("Failed to create stats"); |
a241ec65 PM |
1714 | stats_task = NULL; |
1715 | goto unwind; | |
1716 | } | |
3808dc9f | 1717 | torture_shuffle_task_register(stats_task); |
a241ec65 | 1718 | } |
d84f5203 | 1719 | if (test_no_idle_hz) { |
3808dc9f PM |
1720 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1721 | if (firsterr) | |
73d0a4b1 | 1722 | goto unwind; |
d84f5203 | 1723 | } |
d120f65f PM |
1724 | if (stutter < 0) |
1725 | stutter = 0; | |
1726 | if (stutter) { | |
1727 | /* Create the stutter thread */ | |
1728 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
1729 | "rcu_torture_stutter"); | |
1730 | if (IS_ERR(stutter_task)) { | |
1731 | firsterr = PTR_ERR(stutter_task); | |
5ccf60f2 | 1732 | VERBOSE_TOROUT_ERRSTRING("Failed to create stutter"); |
d120f65f PM |
1733 | stutter_task = NULL; |
1734 | goto unwind; | |
1735 | } | |
3808dc9f | 1736 | torture_shuffle_task_register(stutter_task); |
d120f65f | 1737 | } |
bf66f18e PM |
1738 | if (fqs_duration < 0) |
1739 | fqs_duration = 0; | |
1740 | if (fqs_duration) { | |
1741 | /* Create the stutter thread */ | |
1742 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
1743 | "rcu_torture_fqs"); | |
1744 | if (IS_ERR(fqs_task)) { | |
1745 | firsterr = PTR_ERR(fqs_task); | |
5ccf60f2 | 1746 | VERBOSE_TOROUT_ERRSTRING("Failed to create fqs"); |
bf66f18e PM |
1747 | fqs_task = NULL; |
1748 | goto unwind; | |
1749 | } | |
3808dc9f | 1750 | torture_shuffle_task_register(fqs_task); |
bf66f18e | 1751 | } |
8e8be45e PM |
1752 | if (test_boost_interval < 1) |
1753 | test_boost_interval = 1; | |
1754 | if (test_boost_duration < 2) | |
1755 | test_boost_duration = 2; | |
1756 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1757 | test_boost == 2) { | |
8e8be45e PM |
1758 | |
1759 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1760 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1761 | for_each_possible_cpu(i) { | |
1762 | if (cpu_is_offline(i)) | |
1763 | continue; /* Heuristic: CPU can go offline. */ | |
1764 | retval = rcutorture_booster_init(i); | |
1765 | if (retval < 0) { | |
1766 | firsterr = retval; | |
1767 | goto unwind; | |
1768 | } | |
1769 | } | |
1770 | } | |
d5f546d8 PM |
1771 | if (shutdown_secs > 0) { |
1772 | shutdown_time = jiffies + shutdown_secs * HZ; | |
60f53782 PM |
1773 | shutdown_task = kthread_create(rcu_torture_shutdown, NULL, |
1774 | "rcu_torture_shutdown"); | |
d5f546d8 PM |
1775 | if (IS_ERR(shutdown_task)) { |
1776 | firsterr = PTR_ERR(shutdown_task); | |
5ccf60f2 | 1777 | VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown"); |
d5f546d8 PM |
1778 | shutdown_task = NULL; |
1779 | goto unwind; | |
1780 | } | |
3808dc9f | 1781 | torture_shuffle_task_register(shutdown_task); |
60f53782 | 1782 | wake_up_process(shutdown_task); |
d5f546d8 | 1783 | } |
2e9e8081 | 1784 | i = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
37e377d2 PM |
1785 | if (i != 0) { |
1786 | firsterr = i; | |
1787 | goto unwind; | |
1788 | } | |
8e8be45e | 1789 | register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d2 PM |
1790 | i = rcu_torture_stall_init(); |
1791 | if (i != 0) { | |
1792 | firsterr = i; | |
1793 | goto unwind; | |
1794 | } | |
fae4b54f PM |
1795 | retval = rcu_torture_barrier_init(); |
1796 | if (retval != 0) { | |
1797 | firsterr = retval; | |
1798 | goto unwind; | |
1799 | } | |
d2818df1 PM |
1800 | if (object_debug) |
1801 | rcu_test_debug_objects(); | |
4a298656 | 1802 | rcutorture_record_test_transition(); |
343e9099 | 1803 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1804 | return 0; |
1805 | ||
1806 | unwind: | |
343e9099 | 1807 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1808 | rcu_torture_cleanup(); |
1809 | return firsterr; | |
1810 | } | |
1811 | ||
1812 | module_init(rcu_torture_init); | |
1813 | module_exit(rcu_torture_cleanup); |