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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; |
b58bdcca PM |
113 | #ifdef CONFIG_HOTPLUG_CPU |
114 | static struct task_struct *onoff_task; | |
115 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
c13f3757 | 116 | static struct task_struct *stall_task; |
fae4b54f PM |
117 | static struct task_struct **barrier_cbs_tasks; |
118 | static struct task_struct *barrier_task; | |
a241ec65 PM |
119 | |
120 | #define RCU_TORTURE_PIPE_LEN 10 | |
121 | ||
122 | struct rcu_torture { | |
123 | struct rcu_head rtort_rcu; | |
124 | int rtort_pipe_count; | |
125 | struct list_head rtort_free; | |
996417d2 | 126 | int rtort_mbtest; |
a241ec65 PM |
127 | }; |
128 | ||
a241ec65 | 129 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 130 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 131 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
132 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
133 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
806274c0 PM |
134 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], |
135 | rcu_torture_count) = { 0 }; | |
136 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], | |
137 | rcu_torture_batch) = { 0 }; | |
a241ec65 | 138 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
139 | static atomic_t n_rcu_torture_alloc; |
140 | static atomic_t n_rcu_torture_alloc_fail; | |
141 | static atomic_t n_rcu_torture_free; | |
142 | static atomic_t n_rcu_torture_mberror; | |
143 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 144 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
145 | static long n_rcu_torture_boost_ktrerror; |
146 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
147 | static long n_rcu_torture_boost_failure; |
148 | static long n_rcu_torture_boosts; | |
a71fca58 | 149 | static long n_rcu_torture_timers; |
b58bdcca PM |
150 | static long n_offline_attempts; |
151 | static long n_offline_successes; | |
13dbf914 PM |
152 | static unsigned long sum_offline; |
153 | static int min_offline = -1; | |
154 | static int max_offline; | |
b58bdcca PM |
155 | static long n_online_attempts; |
156 | static long n_online_successes; | |
13dbf914 PM |
157 | static unsigned long sum_online; |
158 | static int min_online = -1; | |
159 | static int max_online; | |
fae4b54f PM |
160 | static long n_barrier_attempts; |
161 | static long n_barrier_successes; | |
e3033736 | 162 | static struct list_head rcu_torture_removed; |
a241ec65 | 163 | |
a71fca58 | 164 | static int stutter_pause_test; |
d120f65f | 165 | |
31a72bce PM |
166 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
167 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
168 | #else | |
169 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
170 | #endif | |
171 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
172 | module_param(rcutorture_runnable, int, 0444); |
173 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 174 | |
3acf4a9a | 175 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 176 | #define rcu_can_boost() 1 |
3acf4a9a | 177 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 178 | #define rcu_can_boost() 0 |
3acf4a9a | 179 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 180 | |
e4aa0da3 SR |
181 | #ifdef CONFIG_RCU_TRACE |
182 | static u64 notrace rcu_trace_clock_local(void) | |
183 | { | |
184 | u64 ts = trace_clock_local(); | |
185 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
186 | return ts; | |
187 | } | |
188 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
189 | static u64 notrace rcu_trace_clock_local(void) | |
190 | { | |
191 | return 0ULL; | |
192 | } | |
193 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
194 | ||
d5f546d8 | 195 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
196 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
197 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
198 | /* and boost task create/destroy. */ | |
fae4b54f | 199 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 200 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
201 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
202 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
203 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 204 | |
d5f546d8 PM |
205 | /* Forward reference. */ |
206 | static void rcu_torture_cleanup(void); | |
207 | ||
343e9099 | 208 | /* |
c9d557c1 | 209 | * Detect and respond to a system shutdown. |
343e9099 PM |
210 | */ |
211 | static int | |
212 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
213 | unsigned long unused2, void *unused3) | |
214 | { | |
c59ab97e | 215 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 216 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 217 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 | 218 | else |
2caa1e44 | 219 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 220 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
c59ab97e | 221 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
222 | return NOTIFY_DONE; |
223 | } | |
224 | ||
a241ec65 PM |
225 | /* |
226 | * Allocate an element from the rcu_tortures pool. | |
227 | */ | |
97a41e26 | 228 | static struct rcu_torture * |
a241ec65 PM |
229 | rcu_torture_alloc(void) |
230 | { | |
231 | struct list_head *p; | |
232 | ||
adac1665 | 233 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
234 | if (list_empty(&rcu_torture_freelist)) { |
235 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 236 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
237 | return NULL; |
238 | } | |
239 | atomic_inc(&n_rcu_torture_alloc); | |
240 | p = rcu_torture_freelist.next; | |
241 | list_del_init(p); | |
adac1665 | 242 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
243 | return container_of(p, struct rcu_torture, rtort_free); |
244 | } | |
245 | ||
246 | /* | |
247 | * Free an element to the rcu_tortures pool. | |
248 | */ | |
249 | static void | |
250 | rcu_torture_free(struct rcu_torture *p) | |
251 | { | |
252 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 253 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 254 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 255 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
256 | } |
257 | ||
d120f65f | 258 | static void |
e66c33d5 | 259 | rcu_stutter_wait(const char *title) |
d120f65f | 260 | { |
c9d557c1 | 261 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
262 | if (rcutorture_runnable) |
263 | schedule_timeout_interruptible(1); | |
264 | else | |
3ccf79f4 | 265 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
f67a3356 | 266 | torture_shutdown_absorb(title); |
343e9099 | 267 | } |
d120f65f PM |
268 | } |
269 | ||
72e9bb54 PM |
270 | /* |
271 | * Operations vector for selecting different types of tests. | |
272 | */ | |
273 | ||
274 | struct rcu_torture_ops { | |
275 | void (*init)(void); | |
72e9bb54 | 276 | int (*readlock)(void); |
51b1130e | 277 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 PM |
278 | void (*readunlock)(int idx); |
279 | int (*completed)(void); | |
0acc512c | 280 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 281 | void (*sync)(void); |
2ec1f2d9 | 282 | void (*exp_sync)(void); |
fae4b54f | 283 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 284 | void (*cb_barrier)(void); |
bf66f18e | 285 | void (*fqs)(void); |
d1008950 | 286 | void (*stats)(char *page); |
0acc512c | 287 | int irq_capable; |
8e8be45e | 288 | int can_boost; |
e66c33d5 | 289 | const char *name; |
72e9bb54 | 290 | }; |
a71fca58 PM |
291 | |
292 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
293 | |
294 | /* | |
295 | * Definitions for rcu torture testing. | |
296 | */ | |
297 | ||
a49a4af7 | 298 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
299 | { |
300 | rcu_read_lock(); | |
301 | return 0; | |
302 | } | |
303 | ||
51b1130e | 304 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 305 | { |
b8d57a76 JT |
306 | const unsigned long shortdelay_us = 200; |
307 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 308 | |
b8d57a76 JT |
309 | /* We want a short delay sometimes to make a reader delay the grace |
310 | * period, and we want a long delay occasionally to trigger | |
311 | * force_quiescent_state. */ | |
b2896d2e | 312 | |
51b1130e | 313 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 314 | mdelay(longdelay_ms); |
51b1130e | 315 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 316 | udelay(shortdelay_us); |
e546f485 | 317 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
318 | if (!preempt_count() && |
319 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
320 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
321 | #endif | |
b2896d2e PM |
322 | } |
323 | ||
a49a4af7 | 324 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
325 | { |
326 | rcu_read_unlock(); | |
327 | } | |
328 | ||
329 | static int rcu_torture_completed(void) | |
330 | { | |
331 | return rcu_batches_completed(); | |
332 | } | |
333 | ||
334 | static void | |
335 | rcu_torture_cb(struct rcu_head *p) | |
336 | { | |
337 | int i; | |
338 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
339 | ||
c9d557c1 | 340 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
341 | /* Test is ending, just drop callbacks on the floor. */ |
342 | /* The next initialization will pick up the pieces. */ | |
343 | return; | |
344 | } | |
345 | i = rp->rtort_pipe_count; | |
346 | if (i > RCU_TORTURE_PIPE_LEN) | |
347 | i = RCU_TORTURE_PIPE_LEN; | |
348 | atomic_inc(&rcu_torture_wcount[i]); | |
349 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
350 | rp->rtort_mbtest = 0; | |
351 | rcu_torture_free(rp); | |
c701d5d9 | 352 | } else { |
0acc512c | 353 | cur_ops->deferred_free(rp); |
c701d5d9 | 354 | } |
72e9bb54 PM |
355 | } |
356 | ||
d9a3da06 PM |
357 | static int rcu_no_completed(void) |
358 | { | |
359 | return 0; | |
360 | } | |
361 | ||
72e9bb54 PM |
362 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
363 | { | |
364 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
365 | } | |
366 | ||
e3033736 JT |
367 | static void rcu_sync_torture_init(void) |
368 | { | |
369 | INIT_LIST_HEAD(&rcu_torture_removed); | |
370 | } | |
371 | ||
2ec1f2d9 | 372 | static struct rcu_torture_ops rcu_ops = { |
0acc512c | 373 | .init = rcu_sync_torture_init, |
0acc512c PM |
374 | .readlock = rcu_torture_read_lock, |
375 | .read_delay = rcu_read_delay, | |
376 | .readunlock = rcu_torture_read_unlock, | |
377 | .completed = rcu_torture_completed, | |
2ec1f2d9 | 378 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 379 | .sync = synchronize_rcu, |
2ec1f2d9 PM |
380 | .exp_sync = synchronize_rcu_expedited, |
381 | .call = call_rcu, | |
382 | .cb_barrier = rcu_barrier, | |
bf66f18e | 383 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
384 | .stats = NULL, |
385 | .irq_capable = 1, | |
8e8be45e | 386 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 387 | .name = "rcu" |
d9a3da06 PM |
388 | }; |
389 | ||
c32e0660 PM |
390 | /* |
391 | * Definitions for rcu_bh torture testing. | |
392 | */ | |
393 | ||
a49a4af7 | 394 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
395 | { |
396 | rcu_read_lock_bh(); | |
397 | return 0; | |
398 | } | |
399 | ||
a49a4af7 | 400 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
401 | { |
402 | rcu_read_unlock_bh(); | |
403 | } | |
404 | ||
405 | static int rcu_bh_torture_completed(void) | |
406 | { | |
407 | return rcu_batches_completed_bh(); | |
408 | } | |
409 | ||
410 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
411 | { | |
412 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
413 | } | |
414 | ||
415 | static struct rcu_torture_ops rcu_bh_ops = { | |
2ec1f2d9 | 416 | .init = rcu_sync_torture_init, |
0acc512c PM |
417 | .readlock = rcu_bh_torture_read_lock, |
418 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
419 | .readunlock = rcu_bh_torture_read_unlock, | |
420 | .completed = rcu_bh_torture_completed, | |
421 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 422 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 423 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 424 | .call = call_rcu_bh, |
0acc512c | 425 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 426 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
427 | .stats = NULL, |
428 | .irq_capable = 1, | |
429 | .name = "rcu_bh" | |
c32e0660 PM |
430 | }; |
431 | ||
b2896d2e PM |
432 | /* |
433 | * Definitions for srcu torture testing. | |
434 | */ | |
435 | ||
cda4dc81 | 436 | DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e | 437 | |
012d3ca8 | 438 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
439 | { |
440 | return srcu_read_lock(&srcu_ctl); | |
441 | } | |
442 | ||
51b1130e | 443 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
444 | { |
445 | long delay; | |
446 | const long uspertick = 1000000 / HZ; | |
447 | const long longdelay = 10; | |
448 | ||
449 | /* We want there to be long-running readers, but not all the time. */ | |
450 | ||
51b1130e PM |
451 | delay = torture_random(rrsp) % |
452 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
453 | if (!delay) |
454 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
455 | else |
456 | rcu_read_delay(rrsp); | |
b2896d2e PM |
457 | } |
458 | ||
012d3ca8 | 459 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
460 | { |
461 | srcu_read_unlock(&srcu_ctl, idx); | |
462 | } | |
463 | ||
464 | static int srcu_torture_completed(void) | |
465 | { | |
466 | return srcu_batches_completed(&srcu_ctl); | |
467 | } | |
468 | ||
9059c940 LJ |
469 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
470 | { | |
471 | call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); | |
472 | } | |
473 | ||
b772e1dd JT |
474 | static void srcu_torture_synchronize(void) |
475 | { | |
476 | synchronize_srcu(&srcu_ctl); | |
477 | } | |
478 | ||
e3f8d378 PM |
479 | static void srcu_torture_call(struct rcu_head *head, |
480 | void (*func)(struct rcu_head *head)) | |
481 | { | |
482 | call_srcu(&srcu_ctl, head, func); | |
483 | } | |
484 | ||
485 | static void srcu_torture_barrier(void) | |
486 | { | |
487 | srcu_barrier(&srcu_ctl); | |
488 | } | |
489 | ||
d1008950 | 490 | static void srcu_torture_stats(char *page) |
b2896d2e | 491 | { |
b2896d2e PM |
492 | int cpu; |
493 | int idx = srcu_ctl.completed & 0x1; | |
494 | ||
d1008950 | 495 | page += sprintf(page, "%s%s per-CPU(idx=%d):", |
b2896d2e PM |
496 | torture_type, TORTURE_FLAG, idx); |
497 | for_each_possible_cpu(cpu) { | |
d1008950 | 498 | page += sprintf(page, " %d(%lu,%lu)", cpu, |
b2896d2e PM |
499 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
500 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
501 | } | |
d1008950 | 502 | sprintf(page, "\n"); |
b2896d2e PM |
503 | } |
504 | ||
2ec1f2d9 PM |
505 | static void srcu_torture_synchronize_expedited(void) |
506 | { | |
507 | synchronize_srcu_expedited(&srcu_ctl); | |
508 | } | |
509 | ||
b2896d2e | 510 | static struct rcu_torture_ops srcu_ops = { |
cda4dc81 | 511 | .init = rcu_sync_torture_init, |
0acc512c PM |
512 | .readlock = srcu_torture_read_lock, |
513 | .read_delay = srcu_read_delay, | |
514 | .readunlock = srcu_torture_read_unlock, | |
515 | .completed = srcu_torture_completed, | |
9059c940 | 516 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 517 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 518 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
519 | .call = srcu_torture_call, |
520 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
521 | .stats = srcu_torture_stats, |
522 | .name = "srcu" | |
b2896d2e PM |
523 | }; |
524 | ||
4b6c2cca JT |
525 | /* |
526 | * Definitions for sched torture testing. | |
527 | */ | |
528 | ||
529 | static int sched_torture_read_lock(void) | |
530 | { | |
531 | preempt_disable(); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | static void sched_torture_read_unlock(int idx) | |
536 | { | |
537 | preempt_enable(); | |
538 | } | |
539 | ||
2326974d PM |
540 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
541 | { | |
542 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
543 | } | |
544 | ||
4b6c2cca | 545 | static struct rcu_torture_ops sched_ops = { |
0acc512c | 546 | .init = rcu_sync_torture_init, |
0acc512c PM |
547 | .readlock = sched_torture_read_lock, |
548 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
549 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 550 | .completed = rcu_no_completed, |
0acc512c | 551 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 552 | .sync = synchronize_sched, |
2ec1f2d9 PM |
553 | .exp_sync = synchronize_sched_expedited, |
554 | .call = call_rcu_sched, | |
0acc512c | 555 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 556 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
557 | .stats = NULL, |
558 | .irq_capable = 1, | |
559 | .name = "sched" | |
4b6c2cca JT |
560 | }; |
561 | ||
8e8be45e PM |
562 | /* |
563 | * RCU torture priority-boost testing. Runs one real-time thread per | |
564 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
565 | * spinning waiting for them to be invoked. If a given callback takes | |
566 | * too long to be invoked, we assume that priority inversion has occurred. | |
567 | */ | |
568 | ||
569 | struct rcu_boost_inflight { | |
570 | struct rcu_head rcu; | |
571 | int inflight; | |
572 | }; | |
573 | ||
574 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
575 | { | |
576 | struct rcu_boost_inflight *rbip = | |
577 | container_of(head, struct rcu_boost_inflight, rcu); | |
578 | ||
579 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
580 | rbip->inflight = 0; | |
581 | } | |
582 | ||
583 | static int rcu_torture_boost(void *arg) | |
584 | { | |
585 | unsigned long call_rcu_time; | |
586 | unsigned long endtime; | |
587 | unsigned long oldstarttime; | |
588 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
589 | struct sched_param sp; | |
590 | ||
5ccf60f2 | 591 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
592 | |
593 | /* Set real-time priority. */ | |
594 | sp.sched_priority = 1; | |
595 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 596 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
597 | n_rcu_torture_boost_rterror++; |
598 | } | |
599 | ||
561190e3 | 600 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
601 | /* Each pass through the following loop does one boost-test cycle. */ |
602 | do { | |
603 | /* Wait for the next test interval. */ | |
604 | oldstarttime = boost_starttime; | |
93898fb1 | 605 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 606 | schedule_timeout_interruptible(oldstarttime - jiffies); |
8e8be45e PM |
607 | rcu_stutter_wait("rcu_torture_boost"); |
608 | if (kthread_should_stop() || | |
609 | fullstop != FULLSTOP_DONTSTOP) | |
610 | goto checkwait; | |
611 | } | |
612 | ||
613 | /* Do one boost-test interval. */ | |
614 | endtime = oldstarttime + test_boost_duration * HZ; | |
615 | call_rcu_time = jiffies; | |
93898fb1 | 616 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
617 | /* If we don't have a callback in flight, post one. */ |
618 | if (!rbi.inflight) { | |
619 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
620 | rbi.inflight = 1; | |
621 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
622 | if (jiffies - call_rcu_time > | |
623 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 624 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
625 | n_rcu_torture_boost_failure++; |
626 | } | |
627 | call_rcu_time = jiffies; | |
628 | } | |
629 | cond_resched(); | |
630 | rcu_stutter_wait("rcu_torture_boost"); | |
631 | if (kthread_should_stop() || | |
632 | fullstop != FULLSTOP_DONTSTOP) | |
633 | goto checkwait; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Set the start time of the next test interval. | |
638 | * Yes, this is vulnerable to long delays, but such | |
639 | * delays simply cause a false negative for the next | |
640 | * interval. Besides, we are running at RT priority, | |
641 | * so delays should be relatively rare. | |
642 | */ | |
ab8f11e5 PM |
643 | while (oldstarttime == boost_starttime && |
644 | !kthread_should_stop()) { | |
8e8be45e PM |
645 | if (mutex_trylock(&boost_mutex)) { |
646 | boost_starttime = jiffies + | |
647 | test_boost_interval * HZ; | |
648 | n_rcu_torture_boosts++; | |
649 | mutex_unlock(&boost_mutex); | |
650 | break; | |
651 | } | |
652 | schedule_timeout_uninterruptible(1); | |
653 | } | |
654 | ||
655 | /* Go do the stutter. */ | |
656 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
657 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
658 | ||
659 | /* Clean up and exit. */ | |
5ccf60f2 | 660 | VERBOSE_TOROUT_STRING("rcu_torture_boost task stopping"); |
f67a3356 | 661 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e PM |
662 | while (!kthread_should_stop() || rbi.inflight) |
663 | schedule_timeout_uninterruptible(1); | |
664 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 665 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
666 | return 0; |
667 | } | |
668 | ||
bf66f18e PM |
669 | /* |
670 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
671 | * bursts of calls to force_quiescent_state(), increasing the probability | |
672 | * of occurrence of some important types of race conditions. | |
673 | */ | |
674 | static int | |
675 | rcu_torture_fqs(void *arg) | |
676 | { | |
677 | unsigned long fqs_resume_time; | |
678 | int fqs_burst_remaining; | |
679 | ||
5ccf60f2 | 680 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
681 | do { |
682 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
683 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
684 | !kthread_should_stop()) { | |
bf66f18e PM |
685 | schedule_timeout_interruptible(1); |
686 | } | |
687 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
688 | while (fqs_burst_remaining > 0 && |
689 | !kthread_should_stop()) { | |
bf66f18e PM |
690 | cur_ops->fqs(); |
691 | udelay(fqs_holdoff); | |
692 | fqs_burst_remaining -= fqs_holdoff; | |
693 | } | |
694 | rcu_stutter_wait("rcu_torture_fqs"); | |
695 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 696 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task stopping"); |
f67a3356 | 697 | torture_shutdown_absorb("rcu_torture_fqs"); |
bf66f18e PM |
698 | while (!kthread_should_stop()) |
699 | schedule_timeout_uninterruptible(1); | |
700 | return 0; | |
701 | } | |
702 | ||
a241ec65 PM |
703 | /* |
704 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
705 | * for that pointed to by rcu_torture_current, freeing the old structure | |
706 | * after a series of grace periods (the "pipeline"). | |
707 | */ | |
708 | static int | |
709 | rcu_torture_writer(void *arg) | |
710 | { | |
2ec1f2d9 | 711 | bool exp; |
a241ec65 | 712 | int i; |
a241ec65 | 713 | struct rcu_torture *rp; |
2ec1f2d9 | 714 | struct rcu_torture *rp1; |
a241ec65 | 715 | struct rcu_torture *old_rp; |
51b1130e | 716 | static DEFINE_TORTURE_RANDOM(rand); |
a241ec65 | 717 | |
5ccf60f2 | 718 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
dbdf65b1 IM |
719 | set_user_nice(current, 19); |
720 | ||
a241ec65 PM |
721 | do { |
722 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
723 | rp = rcu_torture_alloc(); |
724 | if (rp == NULL) | |
a241ec65 PM |
725 | continue; |
726 | rp->rtort_pipe_count = 0; | |
51b1130e | 727 | udelay(torture_random(&rand) & 0x3ff); |
0ddea0ea PM |
728 | old_rp = rcu_dereference_check(rcu_torture_current, |
729 | current == writer_task); | |
996417d2 | 730 | rp->rtort_mbtest = 1; |
a241ec65 | 731 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 732 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 733 | if (old_rp) { |
a241ec65 PM |
734 | i = old_rp->rtort_pipe_count; |
735 | if (i > RCU_TORTURE_PIPE_LEN) | |
736 | i = RCU_TORTURE_PIPE_LEN; | |
737 | atomic_inc(&rcu_torture_wcount[i]); | |
738 | old_rp->rtort_pipe_count++; | |
2ec1f2d9 | 739 | if (gp_normal == gp_exp) |
51b1130e | 740 | exp = !!(torture_random(&rand) & 0x80); |
2ec1f2d9 PM |
741 | else |
742 | exp = gp_exp; | |
743 | if (!exp) { | |
744 | cur_ops->deferred_free(old_rp); | |
745 | } else { | |
746 | cur_ops->exp_sync(); | |
747 | list_add(&old_rp->rtort_free, | |
748 | &rcu_torture_removed); | |
749 | list_for_each_entry_safe(rp, rp1, | |
750 | &rcu_torture_removed, | |
751 | rtort_free) { | |
752 | i = rp->rtort_pipe_count; | |
753 | if (i > RCU_TORTURE_PIPE_LEN) | |
754 | i = RCU_TORTURE_PIPE_LEN; | |
755 | atomic_inc(&rcu_torture_wcount[i]); | |
756 | if (++rp->rtort_pipe_count >= | |
757 | RCU_TORTURE_PIPE_LEN) { | |
758 | rp->rtort_mbtest = 0; | |
759 | list_del(&rp->rtort_free); | |
760 | rcu_torture_free(rp); | |
761 | } | |
762 | } | |
763 | } | |
a241ec65 | 764 | } |
4a298656 | 765 | rcutorture_record_progress(++rcu_torture_current_version); |
c9d557c1 PM |
766 | rcu_stutter_wait("rcu_torture_writer"); |
767 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 768 | VERBOSE_TOROUT_STRING("rcu_torture_writer task stopping"); |
f67a3356 | 769 | torture_shutdown_absorb("rcu_torture_writer"); |
c9d557c1 | 770 | while (!kthread_should_stop()) |
a241ec65 PM |
771 | schedule_timeout_uninterruptible(1); |
772 | return 0; | |
773 | } | |
774 | ||
b772e1dd JT |
775 | /* |
776 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
777 | * delay between calls. | |
778 | */ | |
779 | static int | |
780 | rcu_torture_fakewriter(void *arg) | |
781 | { | |
51b1130e | 782 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 783 | |
5ccf60f2 | 784 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
b772e1dd JT |
785 | set_user_nice(current, 19); |
786 | ||
787 | do { | |
51b1130e PM |
788 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
789 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 790 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 791 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 792 | cur_ops->cb_barrier(); |
2ec1f2d9 | 793 | } else if (gp_normal == gp_exp) { |
51b1130e | 794 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
795 | cur_ops->sync(); |
796 | else | |
797 | cur_ops->exp_sync(); | |
798 | } else if (gp_normal) { | |
72472a02 | 799 | cur_ops->sync(); |
2ec1f2d9 PM |
800 | } else { |
801 | cur_ops->exp_sync(); | |
802 | } | |
c9d557c1 PM |
803 | rcu_stutter_wait("rcu_torture_fakewriter"); |
804 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd | 805 | |
5ccf60f2 | 806 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task stopping"); |
f67a3356 | 807 | torture_shutdown_absorb("rcu_torture_fakewriter"); |
c9d557c1 | 808 | while (!kthread_should_stop()) |
b772e1dd JT |
809 | schedule_timeout_uninterruptible(1); |
810 | return 0; | |
811 | } | |
812 | ||
91afaf30 PM |
813 | void rcutorture_trace_dump(void) |
814 | { | |
815 | static atomic_t beenhere = ATOMIC_INIT(0); | |
816 | ||
817 | if (atomic_read(&beenhere)) | |
818 | return; | |
819 | if (atomic_xchg(&beenhere, 1) != 0) | |
820 | return; | |
91afaf30 PM |
821 | ftrace_dump(DUMP_ALL); |
822 | } | |
823 | ||
0729fbf3 PM |
824 | /* |
825 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
826 | * incrementing the corresponding element of the pipeline array. The | |
827 | * counter in the element should never be greater than 1, otherwise, the | |
828 | * RCU implementation is broken. | |
829 | */ | |
830 | static void rcu_torture_timer(unsigned long unused) | |
831 | { | |
832 | int idx; | |
833 | int completed; | |
52494535 | 834 | int completed_end; |
51b1130e | 835 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
836 | static DEFINE_SPINLOCK(rand_lock); |
837 | struct rcu_torture *p; | |
838 | int pipe_count; | |
52494535 | 839 | unsigned long long ts; |
0729fbf3 PM |
840 | |
841 | idx = cur_ops->readlock(); | |
842 | completed = cur_ops->completed(); | |
e4aa0da3 | 843 | ts = rcu_trace_clock_local(); |
632ee200 | 844 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
845 | rcu_read_lock_bh_held() || |
846 | rcu_read_lock_sched_held() || | |
847 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
848 | if (p == NULL) { |
849 | /* Leave because rcu_torture_writer is not yet underway */ | |
850 | cur_ops->readunlock(idx); | |
851 | return; | |
852 | } | |
853 | if (p->rtort_mbtest == 0) | |
854 | atomic_inc(&n_rcu_torture_mberror); | |
855 | spin_lock(&rand_lock); | |
0acc512c | 856 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
857 | n_rcu_torture_timers++; |
858 | spin_unlock(&rand_lock); | |
859 | preempt_disable(); | |
860 | pipe_count = p->rtort_pipe_count; | |
861 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
862 | /* Should not happen, but... */ | |
863 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
864 | } | |
52494535 PM |
865 | completed_end = cur_ops->completed(); |
866 | if (pipe_count > 1) { | |
52494535 PM |
867 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
868 | completed, completed_end); | |
91afaf30 | 869 | rcutorture_trace_dump(); |
52494535 | 870 | } |
dd17c8f7 | 871 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 872 | completed = completed_end - completed; |
0729fbf3 PM |
873 | if (completed > RCU_TORTURE_PIPE_LEN) { |
874 | /* Should not happen, but... */ | |
875 | completed = RCU_TORTURE_PIPE_LEN; | |
876 | } | |
dd17c8f7 | 877 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
878 | preempt_enable(); |
879 | cur_ops->readunlock(idx); | |
880 | } | |
881 | ||
a241ec65 PM |
882 | /* |
883 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
884 | * incrementing the corresponding element of the pipeline array. The | |
885 | * counter in the element should never be greater than 1, otherwise, the | |
886 | * RCU implementation is broken. | |
887 | */ | |
888 | static int | |
889 | rcu_torture_reader(void *arg) | |
890 | { | |
891 | int completed; | |
52494535 | 892 | int completed_end; |
72e9bb54 | 893 | int idx; |
51b1130e | 894 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
895 | struct rcu_torture *p; |
896 | int pipe_count; | |
0729fbf3 | 897 | struct timer_list t; |
52494535 | 898 | unsigned long long ts; |
a241ec65 | 899 | |
5ccf60f2 | 900 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
dbdf65b1 | 901 | set_user_nice(current, 19); |
0acc512c | 902 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 903 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 904 | |
a241ec65 | 905 | do { |
0acc512c | 906 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 907 | if (!timer_pending(&t)) |
6155fec9 | 908 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 909 | } |
72e9bb54 PM |
910 | idx = cur_ops->readlock(); |
911 | completed = cur_ops->completed(); | |
e4aa0da3 | 912 | ts = rcu_trace_clock_local(); |
632ee200 | 913 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
914 | rcu_read_lock_bh_held() || |
915 | rcu_read_lock_sched_held() || | |
916 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
917 | if (p == NULL) { |
918 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 919 | cur_ops->readunlock(idx); |
a241ec65 PM |
920 | schedule_timeout_interruptible(HZ); |
921 | continue; | |
922 | } | |
996417d2 PM |
923 | if (p->rtort_mbtest == 0) |
924 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 925 | cur_ops->read_delay(&rand); |
a241ec65 PM |
926 | preempt_disable(); |
927 | pipe_count = p->rtort_pipe_count; | |
928 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
929 | /* Should not happen, but... */ | |
930 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
931 | } | |
52494535 PM |
932 | completed_end = cur_ops->completed(); |
933 | if (pipe_count > 1) { | |
52494535 PM |
934 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
935 | ts, completed, completed_end); | |
91afaf30 | 936 | rcutorture_trace_dump(); |
52494535 | 937 | } |
dd17c8f7 | 938 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 939 | completed = completed_end - completed; |
a241ec65 PM |
940 | if (completed > RCU_TORTURE_PIPE_LEN) { |
941 | /* Should not happen, but... */ | |
942 | completed = RCU_TORTURE_PIPE_LEN; | |
943 | } | |
dd17c8f7 | 944 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 945 | preempt_enable(); |
72e9bb54 | 946 | cur_ops->readunlock(idx); |
a241ec65 | 947 | schedule(); |
c9d557c1 PM |
948 | rcu_stutter_wait("rcu_torture_reader"); |
949 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 950 | VERBOSE_TOROUT_STRING("rcu_torture_reader task stopping"); |
f67a3356 | 951 | torture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 952 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 953 | del_timer_sync(&t); |
c9d557c1 | 954 | while (!kthread_should_stop()) |
a241ec65 PM |
955 | schedule_timeout_uninterruptible(1); |
956 | return 0; | |
957 | } | |
958 | ||
959 | /* | |
960 | * Create an RCU-torture statistics message in the specified buffer. | |
961 | */ | |
d1008950 | 962 | static void |
a241ec65 PM |
963 | rcu_torture_printk(char *page) |
964 | { | |
a241ec65 PM |
965 | int cpu; |
966 | int i; | |
967 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
968 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
969 | ||
0a945022 | 970 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
971 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
972 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
973 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
974 | } | |
975 | } | |
976 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
977 | if (pipesummary[i] != 0) | |
978 | break; | |
979 | } | |
d1008950 CG |
980 | page += sprintf(page, "%s%s ", torture_type, TORTURE_FLAG); |
981 | page += sprintf(page, | |
5cf05ad7 | 982 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", |
a241ec65 PM |
983 | rcu_torture_current, |
984 | rcu_torture_current_version, | |
985 | list_empty(&rcu_torture_freelist), | |
986 | atomic_read(&n_rcu_torture_alloc), | |
987 | atomic_read(&n_rcu_torture_alloc_fail), | |
5cf05ad7 | 988 | atomic_read(&n_rcu_torture_free)); |
d1008950 | 989 | page += sprintf(page, "rtmbe: %d rtbke: %ld rtbre: %ld ", |
0729fbf3 | 990 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e | 991 | n_rcu_torture_boost_ktrerror, |
5cf05ad7 | 992 | n_rcu_torture_boost_rterror); |
d1008950 | 993 | page += sprintf(page, "rtbf: %ld rtb: %ld nt: %ld ", |
8e8be45e PM |
994 | n_rcu_torture_boost_failure, |
995 | n_rcu_torture_boosts, | |
5cf05ad7 | 996 | n_rcu_torture_timers); |
d1008950 | 997 | page += sprintf(page, |
13dbf914 PM |
998 | "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", |
999 | n_online_successes, n_online_attempts, | |
1000 | n_offline_successes, n_offline_attempts, | |
1001 | min_online, max_online, | |
1002 | min_offline, max_offline, | |
1003 | sum_online, sum_offline, HZ); | |
d1008950 | 1004 | page += sprintf(page, "barrier: %ld/%ld:%ld", |
fae4b54f PM |
1005 | n_barrier_successes, |
1006 | n_barrier_attempts, | |
1007 | n_rcu_torture_barrier_error); | |
d1008950 | 1008 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); |
8e8be45e | 1009 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1010 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1011 | n_rcu_torture_boost_ktrerror != 0 || |
1012 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1013 | n_rcu_torture_boost_failure != 0 || |
1014 | i > 1) { | |
d1008950 | 1015 | page += sprintf(page, "!!! "); |
996417d2 | 1016 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1017 | WARN_ON_ONCE(1); |
996417d2 | 1018 | } |
d1008950 | 1019 | page += sprintf(page, "Reader Pipe: "); |
a241ec65 | 1020 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1021 | page += sprintf(page, " %ld", pipesummary[i]); |
1022 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1023 | page += sprintf(page, "Reader Batch: "); | |
72e9bb54 | 1024 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1025 | page += sprintf(page, " %ld", batchsummary[i]); |
1026 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1027 | page += sprintf(page, "Free-Block Circulation: "); | |
a241ec65 | 1028 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
d1008950 | 1029 | page += sprintf(page, " %d", |
a241ec65 PM |
1030 | atomic_read(&rcu_torture_wcount[i])); |
1031 | } | |
d1008950 | 1032 | page += sprintf(page, "\n"); |
c8e5b163 | 1033 | if (cur_ops->stats) |
d1008950 | 1034 | cur_ops->stats(page); |
a241ec65 PM |
1035 | } |
1036 | ||
1037 | /* | |
1038 | * Print torture statistics. Caller must ensure that there is only | |
1039 | * one call to this function at a given time!!! This is normally | |
1040 | * accomplished by relying on the module system to only have one copy | |
1041 | * of the module loaded, and then by giving the rcu_torture_stats | |
1042 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1043 | * thread is not running). | |
1044 | */ | |
1045 | static void | |
1046 | rcu_torture_stats_print(void) | |
1047 | { | |
d1008950 CG |
1048 | int size = nr_cpu_ids * 200 + 8192; |
1049 | char *buf; | |
a241ec65 | 1050 | |
d1008950 CG |
1051 | buf = kmalloc(size, GFP_KERNEL); |
1052 | if (!buf) { | |
1053 | pr_err("rcu-torture: Out of memory, need: %d", size); | |
1054 | return; | |
1055 | } | |
1056 | rcu_torture_printk(buf); | |
1057 | pr_alert("%s", buf); | |
1058 | kfree(buf); | |
a241ec65 PM |
1059 | } |
1060 | ||
1061 | /* | |
1062 | * Periodically prints torture statistics, if periodic statistics printing | |
1063 | * was specified via the stat_interval module parameter. | |
1064 | * | |
1065 | * No need to worry about fullstop here, since this one doesn't reference | |
1066 | * volatile state or register callbacks. | |
1067 | */ | |
1068 | static int | |
1069 | rcu_torture_stats(void *arg) | |
1070 | { | |
5ccf60f2 | 1071 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1072 | do { |
1073 | schedule_timeout_interruptible(stat_interval * HZ); | |
1074 | rcu_torture_stats_print(); | |
f67a3356 | 1075 | torture_shutdown_absorb("rcu_torture_stats"); |
c9d557c1 | 1076 | } while (!kthread_should_stop()); |
5ccf60f2 | 1077 | VERBOSE_TOROUT_STRING("rcu_torture_stats task stopping"); |
a241ec65 PM |
1078 | return 0; |
1079 | } | |
1080 | ||
d120f65f PM |
1081 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1082 | * threads periodically. | |
1083 | */ | |
1084 | static int | |
1085 | rcu_torture_stutter(void *arg) | |
1086 | { | |
5ccf60f2 | 1087 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task started"); |
d120f65f PM |
1088 | do { |
1089 | schedule_timeout_interruptible(stutter * HZ); | |
1090 | stutter_pause_test = 1; | |
c9d557c1 | 1091 | if (!kthread_should_stop()) |
d120f65f PM |
1092 | schedule_timeout_interruptible(stutter * HZ); |
1093 | stutter_pause_test = 0; | |
f67a3356 | 1094 | torture_shutdown_absorb("rcu_torture_stutter"); |
c9d557c1 | 1095 | } while (!kthread_should_stop()); |
5ccf60f2 | 1096 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task stopping"); |
d120f65f PM |
1097 | return 0; |
1098 | } | |
1099 | ||
95c38322 | 1100 | static inline void |
e66c33d5 | 1101 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1102 | { |
2caa1e44 PM |
1103 | pr_alert("%s" TORTURE_FLAG |
1104 | "--- %s: nreaders=%d nfakewriters=%d " | |
1105 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1106 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1107 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1108 | "test_boost=%d/%d test_boost_interval=%d " | |
1109 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1110 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1111 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1112 | "onoff_interval=%d onoff_holdoff=%d\n", |
1113 | torture_type, tag, nrealreaders, nfakewriters, | |
1114 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1115 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1116 | test_boost, cur_ops->can_boost, | |
1117 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1118 | stall_cpu, stall_cpu_holdoff, |
1119 | n_barrier_cbs, | |
2caa1e44 | 1120 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1121 | } |
1122 | ||
8e8be45e | 1123 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1124 | .notifier_call = rcutorture_shutdown_notify, |
1125 | }; | |
1126 | ||
8e8be45e PM |
1127 | static void rcutorture_booster_cleanup(int cpu) |
1128 | { | |
1129 | struct task_struct *t; | |
1130 | ||
1131 | if (boost_tasks[cpu] == NULL) | |
1132 | return; | |
1133 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1134 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_boost task"); |
8e8be45e PM |
1135 | t = boost_tasks[cpu]; |
1136 | boost_tasks[cpu] = NULL; | |
1137 | mutex_unlock(&boost_mutex); | |
1138 | ||
1139 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1140 | kthread_stop(t); | |
37e377d2 | 1141 | boost_tasks[cpu] = NULL; |
8e8be45e PM |
1142 | } |
1143 | ||
1144 | static int rcutorture_booster_init(int cpu) | |
1145 | { | |
1146 | int retval; | |
1147 | ||
1148 | if (boost_tasks[cpu] != NULL) | |
1149 | return 0; /* Already created, nothing more to do. */ | |
1150 | ||
1151 | /* Don't allow time recalculation while creating a new task. */ | |
1152 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1153 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1154 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1155 | cpu_to_node(cpu), | |
1156 | "rcu_torture_boost"); | |
8e8be45e PM |
1157 | if (IS_ERR(boost_tasks[cpu])) { |
1158 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1159 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1160 | n_rcu_torture_boost_ktrerror++; |
1161 | boost_tasks[cpu] = NULL; | |
1162 | mutex_unlock(&boost_mutex); | |
1163 | return retval; | |
1164 | } | |
1165 | kthread_bind(boost_tasks[cpu], cpu); | |
1166 | wake_up_process(boost_tasks[cpu]); | |
1167 | mutex_unlock(&boost_mutex); | |
1168 | return 0; | |
1169 | } | |
1170 | ||
d5f546d8 PM |
1171 | /* |
1172 | * Cause the rcutorture test to shutdown the system after the test has | |
1173 | * run for the time specified by the shutdown_secs module parameter. | |
1174 | */ | |
1175 | static int | |
1176 | rcu_torture_shutdown(void *arg) | |
1177 | { | |
1178 | long delta; | |
1179 | unsigned long jiffies_snap; | |
1180 | ||
5ccf60f2 | 1181 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task started"); |
d5f546d8 PM |
1182 | jiffies_snap = ACCESS_ONCE(jiffies); |
1183 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1184 | !kthread_should_stop()) { | |
1185 | delta = shutdown_time - jiffies_snap; | |
1186 | if (verbose) | |
2caa1e44 PM |
1187 | pr_alert("%s" TORTURE_FLAG |
1188 | "rcu_torture_shutdown task: %lu jiffies remaining\n", | |
1189 | torture_type, delta); | |
d5f546d8 PM |
1190 | schedule_timeout_interruptible(delta); |
1191 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1192 | } | |
b58bdcca | 1193 | if (kthread_should_stop()) { |
5ccf60f2 | 1194 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task stopping"); |
d5f546d8 PM |
1195 | return 0; |
1196 | } | |
1197 | ||
1198 | /* OK, shut down the system. */ | |
1199 | ||
5ccf60f2 | 1200 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task shutting down system"); |
d5f546d8 PM |
1201 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ |
1202 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1203 | kernel_power_off(); /* Shut down the system. */ | |
1204 | return 0; | |
1205 | } | |
1206 | ||
b58bdcca PM |
1207 | #ifdef CONFIG_HOTPLUG_CPU |
1208 | ||
1209 | /* | |
1210 | * Execute random CPU-hotplug operations at the interval specified | |
1211 | * by the onoff_interval. | |
1212 | */ | |
49fb4c62 | 1213 | static int |
b58bdcca PM |
1214 | rcu_torture_onoff(void *arg) |
1215 | { | |
1216 | int cpu; | |
13dbf914 | 1217 | unsigned long delta; |
b58bdcca | 1218 | int maxcpu = -1; |
51b1130e | 1219 | DEFINE_TORTURE_RANDOM(rand); |
48983260 | 1220 | int ret; |
13dbf914 | 1221 | unsigned long starttime; |
b58bdcca | 1222 | |
5ccf60f2 | 1223 | VERBOSE_TOROUT_STRING("rcu_torture_onoff task started"); |
b58bdcca PM |
1224 | for_each_online_cpu(cpu) |
1225 | maxcpu = cpu; | |
1226 | WARN_ON(maxcpu < 0); | |
9b9ec9b9 | 1227 | if (onoff_holdoff > 0) { |
5ccf60f2 | 1228 | VERBOSE_TOROUT_STRING("rcu_torture_onoff begin holdoff"); |
9b9ec9b9 | 1229 | schedule_timeout_interruptible(onoff_holdoff * HZ); |
5ccf60f2 | 1230 | VERBOSE_TOROUT_STRING("rcu_torture_onoff end holdoff"); |
9b9ec9b9 | 1231 | } |
b58bdcca | 1232 | while (!kthread_should_stop()) { |
51b1130e | 1233 | cpu = (torture_random(&rand) >> 4) % (maxcpu + 1); |
f220242a | 1234 | if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1235 | if (verbose) |
2caa1e44 PM |
1236 | pr_alert("%s" TORTURE_FLAG |
1237 | "rcu_torture_onoff task: offlining %d\n", | |
1238 | torture_type, cpu); | |
13dbf914 | 1239 | starttime = jiffies; |
b58bdcca | 1240 | n_offline_attempts++; |
48983260 PM |
1241 | ret = cpu_down(cpu); |
1242 | if (ret) { | |
1243 | if (verbose) | |
1244 | pr_alert("%s" TORTURE_FLAG | |
1245 | "rcu_torture_onoff task: offline %d failed: errno %d\n", | |
1246 | torture_type, cpu, ret); | |
1247 | } else { | |
b58bdcca | 1248 | if (verbose) |
2caa1e44 PM |
1249 | pr_alert("%s" TORTURE_FLAG |
1250 | "rcu_torture_onoff task: offlined %d\n", | |
1251 | torture_type, cpu); | |
b58bdcca | 1252 | n_offline_successes++; |
13dbf914 PM |
1253 | delta = jiffies - starttime; |
1254 | sum_offline += delta; | |
1255 | if (min_offline < 0) { | |
1256 | min_offline = delta; | |
1257 | max_offline = delta; | |
1258 | } | |
1259 | if (min_offline > delta) | |
1260 | min_offline = delta; | |
1261 | if (max_offline < delta) | |
1262 | max_offline = delta; | |
b58bdcca | 1263 | } |
f220242a | 1264 | } else if (cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1265 | if (verbose) |
2caa1e44 PM |
1266 | pr_alert("%s" TORTURE_FLAG |
1267 | "rcu_torture_onoff task: onlining %d\n", | |
1268 | torture_type, cpu); | |
13dbf914 | 1269 | starttime = jiffies; |
b58bdcca | 1270 | n_online_attempts++; |
7a6a4107 PM |
1271 | ret = cpu_up(cpu); |
1272 | if (ret) { | |
1273 | if (verbose) | |
1274 | pr_alert("%s" TORTURE_FLAG | |
1275 | "rcu_torture_onoff task: online %d failed: errno %d\n", | |
1276 | torture_type, cpu, ret); | |
1277 | } else { | |
b58bdcca | 1278 | if (verbose) |
2caa1e44 PM |
1279 | pr_alert("%s" TORTURE_FLAG |
1280 | "rcu_torture_onoff task: onlined %d\n", | |
1281 | torture_type, cpu); | |
b58bdcca | 1282 | n_online_successes++; |
13dbf914 PM |
1283 | delta = jiffies - starttime; |
1284 | sum_online += delta; | |
1285 | if (min_online < 0) { | |
1286 | min_online = delta; | |
1287 | max_online = delta; | |
1288 | } | |
1289 | if (min_online > delta) | |
1290 | min_online = delta; | |
1291 | if (max_online < delta) | |
1292 | max_online = delta; | |
b58bdcca PM |
1293 | } |
1294 | } | |
1295 | schedule_timeout_interruptible(onoff_interval * HZ); | |
1296 | } | |
5ccf60f2 | 1297 | VERBOSE_TOROUT_STRING("rcu_torture_onoff task stopping"); |
b58bdcca PM |
1298 | return 0; |
1299 | } | |
1300 | ||
49fb4c62 | 1301 | static int |
b58bdcca PM |
1302 | rcu_torture_onoff_init(void) |
1303 | { | |
3c1b1ce0 JL |
1304 | int ret; |
1305 | ||
b58bdcca PM |
1306 | if (onoff_interval <= 0) |
1307 | return 0; | |
1308 | onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); | |
1309 | if (IS_ERR(onoff_task)) { | |
3c1b1ce0 | 1310 | ret = PTR_ERR(onoff_task); |
b58bdcca | 1311 | onoff_task = NULL; |
3c1b1ce0 | 1312 | return ret; |
b58bdcca | 1313 | } |
3808dc9f | 1314 | torture_shuffle_task_register(onoff_task); |
b58bdcca PM |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | static void rcu_torture_onoff_cleanup(void) | |
1319 | { | |
1320 | if (onoff_task == NULL) | |
1321 | return; | |
5ccf60f2 | 1322 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_onoff task"); |
b58bdcca | 1323 | kthread_stop(onoff_task); |
37e377d2 | 1324 | onoff_task = NULL; |
b58bdcca PM |
1325 | } |
1326 | ||
1327 | #else /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1328 | ||
37e377d2 | 1329 | static int |
b58bdcca PM |
1330 | rcu_torture_onoff_init(void) |
1331 | { | |
37e377d2 | 1332 | return 0; |
b58bdcca PM |
1333 | } |
1334 | ||
1335 | static void rcu_torture_onoff_cleanup(void) | |
1336 | { | |
1337 | } | |
1338 | ||
1339 | #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ | |
1340 | ||
c13f3757 PM |
1341 | /* |
1342 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1343 | * induces a CPU stall for the time specified by stall_cpu. | |
1344 | */ | |
49fb4c62 | 1345 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1346 | { |
1347 | unsigned long stop_at; | |
1348 | ||
5ccf60f2 | 1349 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1350 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1351 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1352 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1353 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1354 | } |
1355 | if (!kthread_should_stop()) { | |
1356 | stop_at = get_seconds() + stall_cpu; | |
1357 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1358 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1359 | rcu_read_lock(); |
1360 | preempt_disable(); | |
1361 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1362 | continue; /* Induce RCU CPU stall warning. */ | |
1363 | preempt_enable(); | |
1364 | rcu_read_unlock(); | |
2caa1e44 | 1365 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1366 | } |
f67a3356 | 1367 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1368 | while (!kthread_should_stop()) |
1369 | schedule_timeout_interruptible(10 * HZ); | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1374 | static int __init rcu_torture_stall_init(void) | |
1375 | { | |
1376 | int ret; | |
1377 | ||
1378 | if (stall_cpu <= 0) | |
1379 | return 0; | |
1380 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1381 | if (IS_ERR(stall_task)) { | |
1382 | ret = PTR_ERR(stall_task); | |
1383 | stall_task = NULL; | |
1384 | return ret; | |
1385 | } | |
3808dc9f | 1386 | torture_shuffle_task_register(stall_task); |
c13f3757 PM |
1387 | return 0; |
1388 | } | |
1389 | ||
1390 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1391 | static void rcu_torture_stall_cleanup(void) | |
1392 | { | |
1393 | if (stall_task == NULL) | |
1394 | return; | |
5ccf60f2 | 1395 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stall_task."); |
c13f3757 | 1396 | kthread_stop(stall_task); |
37e377d2 | 1397 | stall_task = NULL; |
c13f3757 PM |
1398 | } |
1399 | ||
fae4b54f PM |
1400 | /* Callback function for RCU barrier testing. */ |
1401 | void rcu_torture_barrier_cbf(struct rcu_head *rcu) | |
1402 | { | |
1403 | atomic_inc(&barrier_cbs_invoked); | |
1404 | } | |
1405 | ||
1406 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1407 | static int rcu_torture_barrier_cbs(void *arg) | |
1408 | { | |
1409 | long myid = (long)arg; | |
c6ebcbb6 | 1410 | bool lastphase = 0; |
78e4bc34 | 1411 | bool newphase; |
fae4b54f PM |
1412 | struct rcu_head rcu; |
1413 | ||
1414 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1415 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
fae4b54f PM |
1416 | set_user_nice(current, 19); |
1417 | do { | |
1418 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 PM |
1419 | (newphase = |
1420 | ACCESS_ONCE(barrier_phase)) != lastphase || | |
fae4b54f PM |
1421 | kthread_should_stop() || |
1422 | fullstop != FULLSTOP_DONTSTOP); | |
78e4bc34 | 1423 | lastphase = newphase; |
c6ebcbb6 | 1424 | smp_mb(); /* ensure barrier_phase load before ->call(). */ |
fae4b54f PM |
1425 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) |
1426 | break; | |
1427 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1428 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1429 | wake_up(&barrier_wq); | |
1430 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1431 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task stopping"); |
f67a3356 | 1432 | torture_shutdown_absorb("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1433 | while (!kthread_should_stop()) |
1434 | schedule_timeout_interruptible(1); | |
1435 | cur_ops->cb_barrier(); | |
1436 | destroy_rcu_head_on_stack(&rcu); | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1441 | static int rcu_torture_barrier(void *arg) | |
1442 | { | |
1443 | int i; | |
1444 | ||
5ccf60f2 | 1445 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1446 | do { |
1447 | atomic_set(&barrier_cbs_invoked, 0); | |
1448 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
c6ebcbb6 PM |
1449 | smp_mb(); /* Ensure barrier_phase after prior assignments. */ |
1450 | barrier_phase = !barrier_phase; | |
fae4b54f PM |
1451 | for (i = 0; i < n_barrier_cbs; i++) |
1452 | wake_up(&barrier_cbs_wq[i]); | |
1453 | wait_event(barrier_wq, | |
1454 | atomic_read(&barrier_cbs_count) == 0 || | |
1455 | kthread_should_stop() || | |
1456 | fullstop != FULLSTOP_DONTSTOP); | |
1457 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1458 | break; | |
1459 | n_barrier_attempts++; | |
78e4bc34 | 1460 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1461 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1462 | n_rcu_torture_barrier_error++; | |
1463 | WARN_ON_ONCE(1); | |
1464 | } | |
1465 | n_barrier_successes++; | |
1466 | schedule_timeout_interruptible(HZ / 10); | |
1467 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1468 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task stopping"); |
f67a3356 | 1469 | torture_shutdown_absorb("rcu_torture_barrier"); |
fae4b54f PM |
1470 | while (!kthread_should_stop()) |
1471 | schedule_timeout_interruptible(1); | |
1472 | return 0; | |
1473 | } | |
1474 | ||
1475 | /* Initialize RCU barrier testing. */ | |
1476 | static int rcu_torture_barrier_init(void) | |
1477 | { | |
1478 | int i; | |
1479 | int ret; | |
1480 | ||
1481 | if (n_barrier_cbs == 0) | |
1482 | return 0; | |
1483 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1484 | pr_alert("%s" TORTURE_FLAG |
1485 | " Call or barrier ops missing for %s,\n", | |
1486 | torture_type, cur_ops->name); | |
1487 | pr_alert("%s" TORTURE_FLAG | |
1488 | " RCU barrier testing omitted from run.\n", | |
1489 | torture_type); | |
fae4b54f PM |
1490 | return 0; |
1491 | } | |
1492 | atomic_set(&barrier_cbs_count, 0); | |
1493 | atomic_set(&barrier_cbs_invoked, 0); | |
1494 | barrier_cbs_tasks = | |
1495 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1496 | GFP_KERNEL); | |
1497 | barrier_cbs_wq = | |
1498 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1499 | GFP_KERNEL); | |
de5e6437 | 1500 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1501 | return -ENOMEM; |
1502 | for (i = 0; i < n_barrier_cbs; i++) { | |
1503 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
1504 | barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, | |
9059c940 | 1505 | (void *)(long)i, |
fae4b54f PM |
1506 | "rcu_torture_barrier_cbs"); |
1507 | if (IS_ERR(barrier_cbs_tasks[i])) { | |
1508 | ret = PTR_ERR(barrier_cbs_tasks[i]); | |
5ccf60f2 | 1509 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); |
fae4b54f PM |
1510 | barrier_cbs_tasks[i] = NULL; |
1511 | return ret; | |
1512 | } | |
3808dc9f | 1513 | torture_shuffle_task_register(barrier_cbs_tasks[i]); |
fae4b54f PM |
1514 | } |
1515 | barrier_task = kthread_run(rcu_torture_barrier, NULL, | |
1516 | "rcu_torture_barrier"); | |
1517 | if (IS_ERR(barrier_task)) { | |
1518 | ret = PTR_ERR(barrier_task); | |
5ccf60f2 | 1519 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier"); |
fae4b54f PM |
1520 | barrier_task = NULL; |
1521 | } | |
3808dc9f | 1522 | torture_shuffle_task_register(barrier_task); |
fae4b54f PM |
1523 | return 0; |
1524 | } | |
1525 | ||
1526 | /* Clean up after RCU barrier testing. */ | |
1527 | static void rcu_torture_barrier_cleanup(void) | |
1528 | { | |
1529 | int i; | |
1530 | ||
1531 | if (barrier_task != NULL) { | |
5ccf60f2 | 1532 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier task"); |
fae4b54f PM |
1533 | kthread_stop(barrier_task); |
1534 | barrier_task = NULL; | |
1535 | } | |
1536 | if (barrier_cbs_tasks != NULL) { | |
1537 | for (i = 0; i < n_barrier_cbs; i++) { | |
1538 | if (barrier_cbs_tasks[i] != NULL) { | |
5ccf60f2 | 1539 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier_cbs task"); |
fae4b54f PM |
1540 | kthread_stop(barrier_cbs_tasks[i]); |
1541 | barrier_cbs_tasks[i] = NULL; | |
1542 | } | |
1543 | } | |
1544 | kfree(barrier_cbs_tasks); | |
1545 | barrier_cbs_tasks = NULL; | |
1546 | } | |
1547 | if (barrier_cbs_wq != NULL) { | |
1548 | kfree(barrier_cbs_wq); | |
1549 | barrier_cbs_wq = NULL; | |
1550 | } | |
1551 | } | |
1552 | ||
8e8be45e PM |
1553 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1554 | unsigned long action, void *hcpu) | |
1555 | { | |
1556 | long cpu = (long)hcpu; | |
1557 | ||
1558 | switch (action) { | |
1559 | case CPU_ONLINE: | |
1560 | case CPU_DOWN_FAILED: | |
1561 | (void)rcutorture_booster_init(cpu); | |
1562 | break; | |
1563 | case CPU_DOWN_PREPARE: | |
1564 | rcutorture_booster_cleanup(cpu); | |
1565 | break; | |
1566 | default: | |
1567 | break; | |
1568 | } | |
1569 | return NOTIFY_OK; | |
1570 | } | |
1571 | ||
1572 | static struct notifier_block rcutorture_cpu_nb = { | |
1573 | .notifier_call = rcutorture_cpu_notify, | |
1574 | }; | |
1575 | ||
a241ec65 PM |
1576 | static void |
1577 | rcu_torture_cleanup(void) | |
1578 | { | |
1579 | int i; | |
1580 | ||
343e9099 | 1581 | mutex_lock(&fullstop_mutex); |
4a298656 | 1582 | rcutorture_record_test_transition(); |
c9d557c1 | 1583 | if (fullstop == FULLSTOP_SHUTDOWN) { |
2caa1e44 | 1584 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 1585 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
343e9099 | 1586 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1587 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1588 | if (cur_ops->cb_barrier != NULL) |
1589 | cur_ops->cb_barrier(); | |
1590 | return; | |
1591 | } | |
c9d557c1 | 1592 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1593 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1594 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
3808dc9f PM |
1595 | |
1596 | torture_shuffle_cleanup(); /* Must be first task cleaned up. */ | |
fae4b54f | 1597 | rcu_torture_barrier_cleanup(); |
c13f3757 | 1598 | rcu_torture_stall_cleanup(); |
d120f65f | 1599 | if (stutter_task) { |
5ccf60f2 | 1600 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stutter task"); |
d120f65f PM |
1601 | kthread_stop(stutter_task); |
1602 | } | |
1603 | stutter_task = NULL; | |
d84f5203 | 1604 | |
c8e5b163 | 1605 | if (writer_task) { |
5ccf60f2 | 1606 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_writer task"); |
a241ec65 PM |
1607 | kthread_stop(writer_task); |
1608 | } | |
1609 | writer_task = NULL; | |
1610 | ||
c8e5b163 | 1611 | if (reader_tasks) { |
a241ec65 | 1612 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1613 | if (reader_tasks[i]) { |
5ccf60f2 | 1614 | VERBOSE_TOROUT_STRING( |
a241ec65 PM |
1615 | "Stopping rcu_torture_reader task"); |
1616 | kthread_stop(reader_tasks[i]); | |
1617 | } | |
1618 | reader_tasks[i] = NULL; | |
1619 | } | |
1620 | kfree(reader_tasks); | |
1621 | reader_tasks = NULL; | |
1622 | } | |
1623 | rcu_torture_current = NULL; | |
1624 | ||
c8e5b163 | 1625 | if (fakewriter_tasks) { |
b772e1dd | 1626 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1627 | if (fakewriter_tasks[i]) { |
5ccf60f2 | 1628 | VERBOSE_TOROUT_STRING( |
b772e1dd JT |
1629 | "Stopping rcu_torture_fakewriter task"); |
1630 | kthread_stop(fakewriter_tasks[i]); | |
1631 | } | |
1632 | fakewriter_tasks[i] = NULL; | |
1633 | } | |
1634 | kfree(fakewriter_tasks); | |
1635 | fakewriter_tasks = NULL; | |
1636 | } | |
1637 | ||
c8e5b163 | 1638 | if (stats_task) { |
5ccf60f2 | 1639 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stats task"); |
a241ec65 PM |
1640 | kthread_stop(stats_task); |
1641 | } | |
1642 | stats_task = NULL; | |
1643 | ||
bf66f18e | 1644 | if (fqs_task) { |
5ccf60f2 | 1645 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_fqs task"); |
bf66f18e PM |
1646 | kthread_stop(fqs_task); |
1647 | } | |
1648 | fqs_task = NULL; | |
8e8be45e PM |
1649 | if ((test_boost == 1 && cur_ops->can_boost) || |
1650 | test_boost == 2) { | |
1651 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1652 | for_each_possible_cpu(i) | |
1653 | rcutorture_booster_cleanup(i); | |
1654 | } | |
d5f546d8 | 1655 | if (shutdown_task != NULL) { |
5ccf60f2 | 1656 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_shutdown task"); |
d5f546d8 PM |
1657 | kthread_stop(shutdown_task); |
1658 | } | |
37e377d2 | 1659 | shutdown_task = NULL; |
b58bdcca | 1660 | rcu_torture_onoff_cleanup(); |
bf66f18e | 1661 | |
a241ec65 | 1662 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1663 | |
1664 | if (cur_ops->cb_barrier != NULL) | |
1665 | cur_ops->cb_barrier(); | |
a241ec65 | 1666 | |
a241ec65 | 1667 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1668 | |
fae4b54f | 1669 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1670 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bb PM |
1671 | else if (n_online_successes != n_online_attempts || |
1672 | n_offline_successes != n_offline_attempts) | |
1673 | rcu_torture_print_module_parms(cur_ops, | |
1674 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1675 | else |
8e8be45e | 1676 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1677 | } |
1678 | ||
d2818df1 PM |
1679 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1680 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1681 | { | |
1682 | } | |
1683 | ||
1684 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1685 | { | |
1686 | /* | |
1687 | * This -might- happen due to race conditions, but is unlikely. | |
1688 | * The scenario that leads to this happening is that the | |
1689 | * first of the pair of duplicate callbacks is queued, | |
1690 | * someone else starts a grace period that includes that | |
1691 | * callback, then the second of the pair must wait for the | |
1692 | * next grace period. Unlikely, but can happen. If it | |
1693 | * does happen, the debug-objects subsystem won't have splatted. | |
1694 | */ | |
1695 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1696 | } | |
1697 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1698 | ||
1699 | /* | |
1700 | * Verify that double-free causes debug-objects to complain, but only | |
1701 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1702 | * cannot be carried out. | |
1703 | */ | |
1704 | static void rcu_test_debug_objects(void) | |
1705 | { | |
1706 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1707 | struct rcu_head rh1; | |
1708 | struct rcu_head rh2; | |
1709 | ||
1710 | init_rcu_head_on_stack(&rh1); | |
1711 | init_rcu_head_on_stack(&rh2); | |
1712 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1713 | ||
1714 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1715 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1716 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1717 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1718 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1719 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1720 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1721 | local_irq_enable(); | |
1722 | rcu_read_unlock(); | |
1723 | preempt_enable(); | |
1724 | ||
1725 | /* Wait for them all to get done so we can safely return. */ | |
1726 | rcu_barrier(); | |
1727 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1728 | destroy_rcu_head_on_stack(&rh1); | |
1729 | destroy_rcu_head_on_stack(&rh2); | |
1730 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1731 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1732 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1733 | } | |
1734 | ||
6f8bc500 | 1735 | static int __init |
a241ec65 PM |
1736 | rcu_torture_init(void) |
1737 | { | |
1738 | int i; | |
1739 | int cpu; | |
1740 | int firsterr = 0; | |
fae4b54f | 1741 | int retval; |
2ec1f2d9 PM |
1742 | static struct rcu_torture_ops *torture_ops[] = { |
1743 | &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, | |
1744 | }; | |
a241ec65 | 1745 | |
343e9099 PM |
1746 | mutex_lock(&fullstop_mutex); |
1747 | ||
a241ec65 | 1748 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1749 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1750 | cur_ops = torture_ops[i]; |
ade5fb81 | 1751 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1752 | break; |
72e9bb54 | 1753 | } |
ade5fb81 | 1754 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1755 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1756 | torture_type); | |
1757 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1758 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1759 | pr_alert(" %s", torture_ops[i]->name); |
1760 | pr_alert("\n"); | |
343e9099 | 1761 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 1762 | return -EINVAL; |
72e9bb54 | 1763 | } |
bf66f18e | 1764 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1765 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1766 | fqs_duration = 0; |
1767 | } | |
c8e5b163 | 1768 | if (cur_ops->init) |
72e9bb54 PM |
1769 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1770 | ||
a241ec65 PM |
1771 | if (nreaders >= 0) |
1772 | nrealreaders = nreaders; | |
1773 | else | |
1774 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 1775 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 1776 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
1777 | |
1778 | /* Set up the freelist. */ | |
1779 | ||
1780 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1781 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1782 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1783 | list_add_tail(&rcu_tortures[i].rtort_free, |
1784 | &rcu_torture_freelist); | |
1785 | } | |
1786 | ||
1787 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1788 | ||
1789 | rcu_torture_current = NULL; | |
1790 | rcu_torture_current_version = 0; | |
1791 | atomic_set(&n_rcu_torture_alloc, 0); | |
1792 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1793 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1794 | atomic_set(&n_rcu_torture_mberror, 0); |
1795 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1796 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1797 | n_rcu_torture_boost_ktrerror = 0; |
1798 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1799 | n_rcu_torture_boost_failure = 0; |
1800 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1801 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1802 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1803 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1804 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1805 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1806 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1807 | } | |
1808 | } | |
1809 | ||
1810 | /* Start up the kthreads. */ | |
1811 | ||
5ccf60f2 | 1812 | VERBOSE_TOROUT_STRING("Creating rcu_torture_writer task"); |
60f53782 PM |
1813 | writer_task = kthread_create(rcu_torture_writer, NULL, |
1814 | "rcu_torture_writer"); | |
a241ec65 PM |
1815 | if (IS_ERR(writer_task)) { |
1816 | firsterr = PTR_ERR(writer_task); | |
5ccf60f2 | 1817 | VERBOSE_TOROUT_ERRSTRING("Failed to create writer"); |
a241ec65 PM |
1818 | writer_task = NULL; |
1819 | goto unwind; | |
1820 | } | |
3808dc9f | 1821 | torture_shuffle_task_register(writer_task); |
60f53782 | 1822 | wake_up_process(writer_task); |
b772e1dd | 1823 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1824 | GFP_KERNEL); |
b772e1dd | 1825 | if (fakewriter_tasks == NULL) { |
5ccf60f2 | 1826 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
b772e1dd JT |
1827 | firsterr = -ENOMEM; |
1828 | goto unwind; | |
1829 | } | |
1830 | for (i = 0; i < nfakewriters; i++) { | |
5ccf60f2 | 1831 | VERBOSE_TOROUT_STRING("Creating rcu_torture_fakewriter task"); |
b772e1dd | 1832 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, |
a71fca58 | 1833 | "rcu_torture_fakewriter"); |
b772e1dd JT |
1834 | if (IS_ERR(fakewriter_tasks[i])) { |
1835 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
5ccf60f2 | 1836 | VERBOSE_TOROUT_ERRSTRING("Failed to create fakewriter"); |
b772e1dd JT |
1837 | fakewriter_tasks[i] = NULL; |
1838 | goto unwind; | |
1839 | } | |
3808dc9f | 1840 | torture_shuffle_task_register(fakewriter_tasks[i]); |
b772e1dd | 1841 | } |
2860aaba | 1842 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1843 | GFP_KERNEL); |
1844 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1845 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1846 | firsterr = -ENOMEM; |
1847 | goto unwind; | |
1848 | } | |
1849 | for (i = 0; i < nrealreaders; i++) { | |
5ccf60f2 | 1850 | VERBOSE_TOROUT_STRING("Creating rcu_torture_reader task"); |
a241ec65 PM |
1851 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, |
1852 | "rcu_torture_reader"); | |
1853 | if (IS_ERR(reader_tasks[i])) { | |
1854 | firsterr = PTR_ERR(reader_tasks[i]); | |
5ccf60f2 | 1855 | VERBOSE_TOROUT_ERRSTRING("Failed to create reader"); |
a241ec65 PM |
1856 | reader_tasks[i] = NULL; |
1857 | goto unwind; | |
1858 | } | |
3808dc9f | 1859 | torture_shuffle_task_register(reader_tasks[i]); |
a241ec65 PM |
1860 | } |
1861 | if (stat_interval > 0) { | |
5ccf60f2 | 1862 | VERBOSE_TOROUT_STRING("Creating rcu_torture_stats task"); |
a241ec65 PM |
1863 | stats_task = kthread_run(rcu_torture_stats, NULL, |
1864 | "rcu_torture_stats"); | |
1865 | if (IS_ERR(stats_task)) { | |
1866 | firsterr = PTR_ERR(stats_task); | |
5ccf60f2 | 1867 | VERBOSE_TOROUT_ERRSTRING("Failed to create stats"); |
a241ec65 PM |
1868 | stats_task = NULL; |
1869 | goto unwind; | |
1870 | } | |
3808dc9f | 1871 | torture_shuffle_task_register(stats_task); |
a241ec65 | 1872 | } |
d84f5203 | 1873 | if (test_no_idle_hz) { |
3808dc9f PM |
1874 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1875 | if (firsterr) | |
73d0a4b1 | 1876 | goto unwind; |
d84f5203 | 1877 | } |
d120f65f PM |
1878 | if (stutter < 0) |
1879 | stutter = 0; | |
1880 | if (stutter) { | |
1881 | /* Create the stutter thread */ | |
1882 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
1883 | "rcu_torture_stutter"); | |
1884 | if (IS_ERR(stutter_task)) { | |
1885 | firsterr = PTR_ERR(stutter_task); | |
5ccf60f2 | 1886 | VERBOSE_TOROUT_ERRSTRING("Failed to create stutter"); |
d120f65f PM |
1887 | stutter_task = NULL; |
1888 | goto unwind; | |
1889 | } | |
3808dc9f | 1890 | torture_shuffle_task_register(stutter_task); |
d120f65f | 1891 | } |
bf66f18e PM |
1892 | if (fqs_duration < 0) |
1893 | fqs_duration = 0; | |
1894 | if (fqs_duration) { | |
1895 | /* Create the stutter thread */ | |
1896 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
1897 | "rcu_torture_fqs"); | |
1898 | if (IS_ERR(fqs_task)) { | |
1899 | firsterr = PTR_ERR(fqs_task); | |
5ccf60f2 | 1900 | VERBOSE_TOROUT_ERRSTRING("Failed to create fqs"); |
bf66f18e PM |
1901 | fqs_task = NULL; |
1902 | goto unwind; | |
1903 | } | |
3808dc9f | 1904 | torture_shuffle_task_register(fqs_task); |
bf66f18e | 1905 | } |
8e8be45e PM |
1906 | if (test_boost_interval < 1) |
1907 | test_boost_interval = 1; | |
1908 | if (test_boost_duration < 2) | |
1909 | test_boost_duration = 2; | |
1910 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1911 | test_boost == 2) { | |
8e8be45e PM |
1912 | |
1913 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1914 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1915 | for_each_possible_cpu(i) { | |
1916 | if (cpu_is_offline(i)) | |
1917 | continue; /* Heuristic: CPU can go offline. */ | |
1918 | retval = rcutorture_booster_init(i); | |
1919 | if (retval < 0) { | |
1920 | firsterr = retval; | |
1921 | goto unwind; | |
1922 | } | |
1923 | } | |
1924 | } | |
d5f546d8 PM |
1925 | if (shutdown_secs > 0) { |
1926 | shutdown_time = jiffies + shutdown_secs * HZ; | |
60f53782 PM |
1927 | shutdown_task = kthread_create(rcu_torture_shutdown, NULL, |
1928 | "rcu_torture_shutdown"); | |
d5f546d8 PM |
1929 | if (IS_ERR(shutdown_task)) { |
1930 | firsterr = PTR_ERR(shutdown_task); | |
5ccf60f2 | 1931 | VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown"); |
d5f546d8 PM |
1932 | shutdown_task = NULL; |
1933 | goto unwind; | |
1934 | } | |
3808dc9f | 1935 | torture_shuffle_task_register(shutdown_task); |
60f53782 | 1936 | wake_up_process(shutdown_task); |
d5f546d8 | 1937 | } |
37e377d2 PM |
1938 | i = rcu_torture_onoff_init(); |
1939 | if (i != 0) { | |
1940 | firsterr = i; | |
1941 | goto unwind; | |
1942 | } | |
8e8be45e | 1943 | register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d2 PM |
1944 | i = rcu_torture_stall_init(); |
1945 | if (i != 0) { | |
1946 | firsterr = i; | |
1947 | goto unwind; | |
1948 | } | |
fae4b54f PM |
1949 | retval = rcu_torture_barrier_init(); |
1950 | if (retval != 0) { | |
1951 | firsterr = retval; | |
1952 | goto unwind; | |
1953 | } | |
d2818df1 PM |
1954 | if (object_debug) |
1955 | rcu_test_debug_objects(); | |
4a298656 | 1956 | rcutorture_record_test_transition(); |
343e9099 | 1957 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1958 | return 0; |
1959 | ||
1960 | unwind: | |
343e9099 | 1961 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1962 | rcu_torture_cleanup(); |
1963 | return firsterr; | |
1964 | } | |
1965 | ||
1966 | module_init(rcu_torture_init); | |
1967 | module_exit(rcu_torture_cleanup); |