Commit | Line | Data |
---|---|---|
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 | |
87de1cfd PM |
15 | * along with this program; if not, you can access it online at |
16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
a241ec65 | 17 | * |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
e0198b29 | 21 | * Josh Triplett <josh@joshtriplett.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> |
38706bc5 | 52 | #include <linux/vmalloc.h> |
a241ec65 PM |
53 | |
54 | MODULE_LICENSE("GPL"); | |
e0198b29 | 55 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@joshtriplett.org>"); |
a241ec65 | 56 | |
4102adab | 57 | |
38706bc5 PM |
58 | torture_param(int, cbflood_inter_holdoff, HZ, |
59 | "Holdoff between floods (jiffies)"); | |
60 | torture_param(int, cbflood_intra_holdoff, 1, | |
61 | "Holdoff between bursts (jiffies)"); | |
62 | torture_param(int, cbflood_n_burst, 3, "# bursts in flood, zero to disable"); | |
63 | torture_param(int, cbflood_n_per_burst, 20000, | |
64 | "# callbacks per burst in flood"); | |
9e250225 PM |
65 | torture_param(int, fqs_duration, 0, |
66 | "Duration of fqs bursts (us), 0 to disable"); | |
67 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
68 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
a48f3fad | 69 | torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives"); |
9e250225 PM |
70 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); |
71 | torture_param(bool, gp_normal, false, | |
72 | "Use normal (non-expedited) GP wait primitives"); | |
f0bf8fab | 73 | torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives"); |
9e250225 PM |
74 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); |
75 | torture_param(int, n_barrier_cbs, 0, | |
76 | "# of callbacks/kthreads for barrier testing"); | |
77 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
78 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
79 | torture_param(int, object_debug, 0, | |
80 | "Enable debug-object double call_rcu() testing"); | |
81 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
82 | torture_param(int, onoff_interval, 0, | |
83 | "Time between CPU hotplugs (s), 0=disable"); | |
84 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); | |
85 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
86 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
87 | torture_param(int, stall_cpu_holdoff, 10, | |
88 | "Time to wait before starting stall (s)."); | |
89 | torture_param(int, stat_interval, 60, | |
90 | "Number of seconds between stats printk()s"); | |
91 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
92 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
93 | torture_param(int, test_boost_duration, 4, | |
94 | "Duration of each boost test, seconds."); | |
95 | torture_param(int, test_boost_interval, 7, | |
96 | "Interval between boost tests, seconds."); | |
97 | torture_param(bool, test_no_idle_hz, true, | |
98 | "Test support for tickless idle CPUs"); | |
b5daa8f3 PM |
99 | torture_param(bool, verbose, true, |
100 | "Enable verbose debugging printk()s"); | |
9e250225 | 101 | |
d10453e9 | 102 | static char *torture_type = "rcu"; |
d6ad6711 | 103 | module_param(torture_type, charp, 0444); |
d10453e9 | 104 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
a241ec65 | 105 | |
a241ec65 | 106 | static int nrealreaders; |
38706bc5 | 107 | static int ncbflooders; |
a241ec65 | 108 | static struct task_struct *writer_task; |
b772e1dd | 109 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
110 | static struct task_struct **reader_tasks; |
111 | static struct task_struct *stats_task; | |
38706bc5 | 112 | static struct task_struct **cbflood_task; |
bf66f18e | 113 | static struct task_struct *fqs_task; |
8e8be45e | 114 | static struct task_struct *boost_tasks[NR_CPUS]; |
c13f3757 | 115 | static struct task_struct *stall_task; |
fae4b54f PM |
116 | static struct task_struct **barrier_cbs_tasks; |
117 | static struct task_struct *barrier_task; | |
a241ec65 PM |
118 | |
119 | #define RCU_TORTURE_PIPE_LEN 10 | |
120 | ||
121 | struct rcu_torture { | |
122 | struct rcu_head rtort_rcu; | |
123 | int rtort_pipe_count; | |
124 | struct list_head rtort_free; | |
996417d2 | 125 | int rtort_mbtest; |
a241ec65 PM |
126 | }; |
127 | ||
a241ec65 | 128 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 129 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 130 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
131 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
132 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
806274c0 PM |
133 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], |
134 | rcu_torture_count) = { 0 }; | |
135 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], | |
136 | rcu_torture_batch) = { 0 }; | |
a241ec65 | 137 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
138 | static atomic_t n_rcu_torture_alloc; |
139 | static atomic_t n_rcu_torture_alloc_fail; | |
140 | static atomic_t n_rcu_torture_free; | |
141 | static atomic_t n_rcu_torture_mberror; | |
142 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 143 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
144 | static long n_rcu_torture_boost_ktrerror; |
145 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
146 | static long n_rcu_torture_boost_failure; |
147 | static long n_rcu_torture_boosts; | |
a71fca58 | 148 | static long n_rcu_torture_timers; |
fae4b54f PM |
149 | static long n_barrier_attempts; |
150 | static long n_barrier_successes; | |
38706bc5 | 151 | static atomic_long_t n_cbfloods; |
e3033736 | 152 | static struct list_head rcu_torture_removed; |
d120f65f | 153 | |
ad0dc7f9 PM |
154 | static int rcu_torture_writer_state; |
155 | #define RTWS_FIXED_DELAY 0 | |
156 | #define RTWS_DELAY 1 | |
157 | #define RTWS_REPLACE 2 | |
158 | #define RTWS_DEF_FREE 3 | |
159 | #define RTWS_EXP_SYNC 4 | |
a48f3fad PM |
160 | #define RTWS_COND_GET 5 |
161 | #define RTWS_COND_SYNC 6 | |
f0bf8fab PM |
162 | #define RTWS_SYNC 7 |
163 | #define RTWS_STUTTER 8 | |
164 | #define RTWS_STOPPING 9 | |
ad0dc7f9 | 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 | |
59da22a0 PM |
171 | static int torture_runnable = RCUTORTURE_RUNNABLE_INIT; |
172 | module_param(torture_runnable, int, 0444); | |
173 | MODULE_PARM_DESC(torture_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 | ||
8e8be45e | 195 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 196 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 197 | /* and boost task create/destroy. */ |
fae4b54f | 198 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 199 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
200 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
201 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
202 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 203 | |
a241ec65 PM |
204 | /* |
205 | * Allocate an element from the rcu_tortures pool. | |
206 | */ | |
97a41e26 | 207 | static struct rcu_torture * |
a241ec65 PM |
208 | rcu_torture_alloc(void) |
209 | { | |
210 | struct list_head *p; | |
211 | ||
adac1665 | 212 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
213 | if (list_empty(&rcu_torture_freelist)) { |
214 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 215 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
216 | return NULL; |
217 | } | |
218 | atomic_inc(&n_rcu_torture_alloc); | |
219 | p = rcu_torture_freelist.next; | |
220 | list_del_init(p); | |
adac1665 | 221 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
222 | return container_of(p, struct rcu_torture, rtort_free); |
223 | } | |
224 | ||
225 | /* | |
226 | * Free an element to the rcu_tortures pool. | |
227 | */ | |
228 | static void | |
229 | rcu_torture_free(struct rcu_torture *p) | |
230 | { | |
231 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 232 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 233 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 234 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
235 | } |
236 | ||
72e9bb54 PM |
237 | /* |
238 | * Operations vector for selecting different types of tests. | |
239 | */ | |
240 | ||
241 | struct rcu_torture_ops { | |
ad0dc7f9 | 242 | int ttype; |
72e9bb54 | 243 | void (*init)(void); |
72e9bb54 | 244 | int (*readlock)(void); |
51b1130e | 245 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 246 | void (*readunlock)(int idx); |
917963d0 | 247 | unsigned long (*started)(void); |
6b80da42 | 248 | unsigned long (*completed)(void); |
0acc512c | 249 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 250 | void (*sync)(void); |
2ec1f2d9 | 251 | void (*exp_sync)(void); |
a48f3fad PM |
252 | unsigned long (*get_state)(void); |
253 | void (*cond_sync)(unsigned long oldstate); | |
fae4b54f | 254 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 255 | void (*cb_barrier)(void); |
bf66f18e | 256 | void (*fqs)(void); |
eea203fe | 257 | void (*stats)(void); |
0acc512c | 258 | int irq_capable; |
8e8be45e | 259 | int can_boost; |
e66c33d5 | 260 | const char *name; |
72e9bb54 | 261 | }; |
a71fca58 PM |
262 | |
263 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
264 | |
265 | /* | |
266 | * Definitions for rcu torture testing. | |
267 | */ | |
268 | ||
a49a4af7 | 269 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
270 | { |
271 | rcu_read_lock(); | |
272 | return 0; | |
273 | } | |
274 | ||
51b1130e | 275 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 276 | { |
b8d57a76 JT |
277 | const unsigned long shortdelay_us = 200; |
278 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 279 | |
b8d57a76 JT |
280 | /* We want a short delay sometimes to make a reader delay the grace |
281 | * period, and we want a long delay occasionally to trigger | |
282 | * force_quiescent_state. */ | |
b2896d2e | 283 | |
51b1130e | 284 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 285 | mdelay(longdelay_ms); |
51b1130e | 286 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 287 | udelay(shortdelay_us); |
e546f485 | 288 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
289 | if (!preempt_count() && |
290 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
291 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
292 | #endif | |
b2896d2e PM |
293 | } |
294 | ||
a49a4af7 | 295 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
296 | { |
297 | rcu_read_unlock(); | |
298 | } | |
299 | ||
a48f3fad PM |
300 | /* |
301 | * Update callback in the pipe. This should be invoked after a grace period. | |
302 | */ | |
303 | static bool | |
304 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
305 | { | |
306 | int i; | |
307 | ||
308 | i = rp->rtort_pipe_count; | |
309 | if (i > RCU_TORTURE_PIPE_LEN) | |
310 | i = RCU_TORTURE_PIPE_LEN; | |
311 | atomic_inc(&rcu_torture_wcount[i]); | |
312 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
313 | rp->rtort_mbtest = 0; | |
314 | return true; | |
315 | } | |
316 | return false; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
321 | * primitives. | |
322 | */ | |
323 | static void | |
324 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
325 | { | |
326 | struct rcu_torture *rp; | |
327 | struct rcu_torture *rp1; | |
328 | ||
329 | if (old_rp) | |
330 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
331 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
332 | if (rcu_torture_pipe_update_one(rp)) { | |
333 | list_del(&rp->rtort_free); | |
334 | rcu_torture_free(rp); | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
72e9bb54 PM |
339 | static void |
340 | rcu_torture_cb(struct rcu_head *p) | |
341 | { | |
72e9bb54 PM |
342 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
343 | ||
36970bb9 | 344 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
345 | /* Test is ending, just drop callbacks on the floor. */ |
346 | /* The next initialization will pick up the pieces. */ | |
347 | return; | |
348 | } | |
a48f3fad | 349 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 350 | rcu_torture_free(rp); |
a48f3fad | 351 | else |
0acc512c | 352 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
353 | } |
354 | ||
6b80da42 | 355 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
356 | { |
357 | return 0; | |
358 | } | |
359 | ||
72e9bb54 PM |
360 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
361 | { | |
362 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
363 | } | |
364 | ||
e3033736 JT |
365 | static void rcu_sync_torture_init(void) |
366 | { | |
367 | INIT_LIST_HEAD(&rcu_torture_removed); | |
368 | } | |
369 | ||
2ec1f2d9 | 370 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 371 | .ttype = RCU_FLAVOR, |
0acc512c | 372 | .init = rcu_sync_torture_init, |
0acc512c PM |
373 | .readlock = rcu_torture_read_lock, |
374 | .read_delay = rcu_read_delay, | |
375 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 376 | .started = rcu_batches_started, |
1e32eaee | 377 | .completed = rcu_batches_completed, |
2ec1f2d9 | 378 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 379 | .sync = synchronize_rcu, |
2ec1f2d9 | 380 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
381 | .get_state = get_state_synchronize_rcu, |
382 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
383 | .call = call_rcu, |
384 | .cb_barrier = rcu_barrier, | |
bf66f18e | 385 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
386 | .stats = NULL, |
387 | .irq_capable = 1, | |
8e8be45e | 388 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 389 | .name = "rcu" |
d9a3da06 PM |
390 | }; |
391 | ||
c32e0660 PM |
392 | /* |
393 | * Definitions for rcu_bh torture testing. | |
394 | */ | |
395 | ||
a49a4af7 | 396 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
397 | { |
398 | rcu_read_lock_bh(); | |
399 | return 0; | |
400 | } | |
401 | ||
a49a4af7 | 402 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
403 | { |
404 | rcu_read_unlock_bh(); | |
405 | } | |
406 | ||
c32e0660 PM |
407 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
408 | { | |
409 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
410 | } | |
411 | ||
412 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 413 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 414 | .init = rcu_sync_torture_init, |
0acc512c PM |
415 | .readlock = rcu_bh_torture_read_lock, |
416 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
417 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 418 | .started = rcu_batches_started_bh, |
1e32eaee | 419 | .completed = rcu_batches_completed_bh, |
0acc512c | 420 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 421 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 422 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 423 | .call = call_rcu_bh, |
0acc512c | 424 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 425 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
426 | .stats = NULL, |
427 | .irq_capable = 1, | |
428 | .name = "rcu_bh" | |
c32e0660 PM |
429 | }; |
430 | ||
ff20e251 PM |
431 | /* |
432 | * Don't even think about trying any of these in real life!!! | |
433 | * The names includes "busted", and they really means it! | |
434 | * The only purpose of these functions is to provide a buggy RCU | |
435 | * implementation to make sure that rcutorture correctly emits | |
436 | * buggy-RCU error messages. | |
437 | */ | |
438 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
439 | { | |
440 | /* This is a deliberate bug for testing purposes only! */ | |
441 | rcu_torture_cb(&p->rtort_rcu); | |
442 | } | |
443 | ||
444 | static void synchronize_rcu_busted(void) | |
445 | { | |
446 | /* This is a deliberate bug for testing purposes only! */ | |
447 | } | |
448 | ||
449 | static void | |
450 | call_rcu_busted(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) | |
451 | { | |
452 | /* This is a deliberate bug for testing purposes only! */ | |
453 | func(head); | |
454 | } | |
455 | ||
456 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 457 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
458 | .init = rcu_sync_torture_init, |
459 | .readlock = rcu_torture_read_lock, | |
460 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
461 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 462 | .started = rcu_no_completed, |
ff20e251 PM |
463 | .completed = rcu_no_completed, |
464 | .deferred_free = rcu_busted_torture_deferred_free, | |
465 | .sync = synchronize_rcu_busted, | |
466 | .exp_sync = synchronize_rcu_busted, | |
467 | .call = call_rcu_busted, | |
468 | .cb_barrier = NULL, | |
469 | .fqs = NULL, | |
470 | .stats = NULL, | |
471 | .irq_capable = 1, | |
472 | .name = "rcu_busted" | |
473 | }; | |
474 | ||
b2896d2e PM |
475 | /* |
476 | * Definitions for srcu torture testing. | |
477 | */ | |
478 | ||
cda4dc81 | 479 | DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e | 480 | |
012d3ca8 | 481 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
482 | { |
483 | return srcu_read_lock(&srcu_ctl); | |
484 | } | |
485 | ||
51b1130e | 486 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
487 | { |
488 | long delay; | |
489 | const long uspertick = 1000000 / HZ; | |
490 | const long longdelay = 10; | |
491 | ||
492 | /* We want there to be long-running readers, but not all the time. */ | |
493 | ||
51b1130e PM |
494 | delay = torture_random(rrsp) % |
495 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
496 | if (!delay) |
497 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
498 | else |
499 | rcu_read_delay(rrsp); | |
b2896d2e PM |
500 | } |
501 | ||
012d3ca8 | 502 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
503 | { |
504 | srcu_read_unlock(&srcu_ctl, idx); | |
505 | } | |
506 | ||
6b80da42 | 507 | static unsigned long srcu_torture_completed(void) |
b2896d2e PM |
508 | { |
509 | return srcu_batches_completed(&srcu_ctl); | |
510 | } | |
511 | ||
9059c940 LJ |
512 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
513 | { | |
514 | call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); | |
515 | } | |
516 | ||
b772e1dd JT |
517 | static void srcu_torture_synchronize(void) |
518 | { | |
519 | synchronize_srcu(&srcu_ctl); | |
520 | } | |
521 | ||
e3f8d378 PM |
522 | static void srcu_torture_call(struct rcu_head *head, |
523 | void (*func)(struct rcu_head *head)) | |
524 | { | |
525 | call_srcu(&srcu_ctl, head, func); | |
526 | } | |
527 | ||
528 | static void srcu_torture_barrier(void) | |
529 | { | |
530 | srcu_barrier(&srcu_ctl); | |
531 | } | |
532 | ||
eea203fe | 533 | static void srcu_torture_stats(void) |
b2896d2e | 534 | { |
b2896d2e PM |
535 | int cpu; |
536 | int idx = srcu_ctl.completed & 0x1; | |
537 | ||
eea203fe JP |
538 | pr_alert("%s%s per-CPU(idx=%d):", |
539 | torture_type, TORTURE_FLAG, idx); | |
b2896d2e | 540 | for_each_possible_cpu(cpu) { |
589a8f59 PM |
541 | long c0, c1; |
542 | ||
543 | c0 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx]; | |
544 | c1 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]; | |
eea203fe | 545 | pr_cont(" %d(%ld,%ld)", cpu, c0, c1); |
b2896d2e | 546 | } |
eea203fe | 547 | pr_cont("\n"); |
b2896d2e PM |
548 | } |
549 | ||
2ec1f2d9 PM |
550 | static void srcu_torture_synchronize_expedited(void) |
551 | { | |
552 | synchronize_srcu_expedited(&srcu_ctl); | |
553 | } | |
554 | ||
b2896d2e | 555 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 556 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 557 | .init = rcu_sync_torture_init, |
0acc512c PM |
558 | .readlock = srcu_torture_read_lock, |
559 | .read_delay = srcu_read_delay, | |
560 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 561 | .started = NULL, |
0acc512c | 562 | .completed = srcu_torture_completed, |
9059c940 | 563 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 564 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 565 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
566 | .call = srcu_torture_call, |
567 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
568 | .stats = srcu_torture_stats, |
569 | .name = "srcu" | |
b2896d2e PM |
570 | }; |
571 | ||
4b6c2cca JT |
572 | /* |
573 | * Definitions for sched torture testing. | |
574 | */ | |
575 | ||
576 | static int sched_torture_read_lock(void) | |
577 | { | |
578 | preempt_disable(); | |
579 | return 0; | |
580 | } | |
581 | ||
582 | static void sched_torture_read_unlock(int idx) | |
583 | { | |
584 | preempt_enable(); | |
585 | } | |
586 | ||
2326974d PM |
587 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
588 | { | |
589 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
590 | } | |
591 | ||
4b6c2cca | 592 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 593 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 594 | .init = rcu_sync_torture_init, |
0acc512c PM |
595 | .readlock = sched_torture_read_lock, |
596 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
597 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 598 | .started = rcu_batches_started_sched, |
1e32eaee | 599 | .completed = rcu_batches_completed_sched, |
0acc512c | 600 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 601 | .sync = synchronize_sched, |
2ec1f2d9 PM |
602 | .exp_sync = synchronize_sched_expedited, |
603 | .call = call_rcu_sched, | |
0acc512c | 604 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 605 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
606 | .stats = NULL, |
607 | .irq_capable = 1, | |
608 | .name = "sched" | |
4b6c2cca JT |
609 | }; |
610 | ||
69c60455 PM |
611 | #ifdef CONFIG_TASKS_RCU |
612 | ||
613 | /* | |
614 | * Definitions for RCU-tasks torture testing. | |
615 | */ | |
616 | ||
617 | static int tasks_torture_read_lock(void) | |
618 | { | |
619 | return 0; | |
620 | } | |
621 | ||
622 | static void tasks_torture_read_unlock(int idx) | |
623 | { | |
624 | } | |
625 | ||
626 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
627 | { | |
628 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
629 | } | |
630 | ||
631 | static struct rcu_torture_ops tasks_ops = { | |
632 | .ttype = RCU_TASKS_FLAVOR, | |
633 | .init = rcu_sync_torture_init, | |
634 | .readlock = tasks_torture_read_lock, | |
635 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
636 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 637 | .started = rcu_no_completed, |
69c60455 PM |
638 | .completed = rcu_no_completed, |
639 | .deferred_free = rcu_tasks_torture_deferred_free, | |
640 | .sync = synchronize_rcu_tasks, | |
641 | .exp_sync = synchronize_rcu_tasks, | |
642 | .call = call_rcu_tasks, | |
643 | .cb_barrier = rcu_barrier_tasks, | |
644 | .fqs = NULL, | |
645 | .stats = NULL, | |
646 | .irq_capable = 1, | |
647 | .name = "tasks" | |
648 | }; | |
649 | ||
650 | #define RCUTORTURE_TASKS_OPS &tasks_ops, | |
651 | ||
652 | #else /* #ifdef CONFIG_TASKS_RCU */ | |
653 | ||
654 | #define RCUTORTURE_TASKS_OPS | |
655 | ||
656 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ | |
657 | ||
8e8be45e PM |
658 | /* |
659 | * RCU torture priority-boost testing. Runs one real-time thread per | |
660 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
661 | * spinning waiting for them to be invoked. If a given callback takes | |
662 | * too long to be invoked, we assume that priority inversion has occurred. | |
663 | */ | |
664 | ||
665 | struct rcu_boost_inflight { | |
666 | struct rcu_head rcu; | |
667 | int inflight; | |
668 | }; | |
669 | ||
670 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
671 | { | |
672 | struct rcu_boost_inflight *rbip = | |
673 | container_of(head, struct rcu_boost_inflight, rcu); | |
674 | ||
675 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
676 | rbip->inflight = 0; | |
677 | } | |
678 | ||
679 | static int rcu_torture_boost(void *arg) | |
680 | { | |
681 | unsigned long call_rcu_time; | |
682 | unsigned long endtime; | |
683 | unsigned long oldstarttime; | |
684 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
685 | struct sched_param sp; | |
686 | ||
5ccf60f2 | 687 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
688 | |
689 | /* Set real-time priority. */ | |
690 | sp.sched_priority = 1; | |
691 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 692 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
693 | n_rcu_torture_boost_rterror++; |
694 | } | |
695 | ||
561190e3 | 696 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
697 | /* Each pass through the following loop does one boost-test cycle. */ |
698 | do { | |
699 | /* Wait for the next test interval. */ | |
700 | oldstarttime = boost_starttime; | |
93898fb1 | 701 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 702 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 703 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 704 | if (torture_must_stop()) |
8e8be45e PM |
705 | goto checkwait; |
706 | } | |
707 | ||
708 | /* Do one boost-test interval. */ | |
709 | endtime = oldstarttime + test_boost_duration * HZ; | |
710 | call_rcu_time = jiffies; | |
93898fb1 | 711 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
712 | /* If we don't have a callback in flight, post one. */ |
713 | if (!rbi.inflight) { | |
714 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
715 | rbi.inflight = 1; | |
716 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
717 | if (jiffies - call_rcu_time > | |
718 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 719 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
720 | n_rcu_torture_boost_failure++; |
721 | } | |
722 | call_rcu_time = jiffies; | |
723 | } | |
bde6c3aa | 724 | cond_resched_rcu_qs(); |
628edaa5 | 725 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 726 | if (torture_must_stop()) |
8e8be45e PM |
727 | goto checkwait; |
728 | } | |
729 | ||
730 | /* | |
731 | * Set the start time of the next test interval. | |
732 | * Yes, this is vulnerable to long delays, but such | |
733 | * delays simply cause a false negative for the next | |
734 | * interval. Besides, we are running at RT priority, | |
735 | * so delays should be relatively rare. | |
736 | */ | |
ab8f11e5 PM |
737 | while (oldstarttime == boost_starttime && |
738 | !kthread_should_stop()) { | |
8e8be45e PM |
739 | if (mutex_trylock(&boost_mutex)) { |
740 | boost_starttime = jiffies + | |
741 | test_boost_interval * HZ; | |
742 | n_rcu_torture_boosts++; | |
743 | mutex_unlock(&boost_mutex); | |
744 | break; | |
745 | } | |
746 | schedule_timeout_uninterruptible(1); | |
747 | } | |
748 | ||
749 | /* Go do the stutter. */ | |
628edaa5 | 750 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 751 | } while (!torture_must_stop()); |
8e8be45e PM |
752 | |
753 | /* Clean up and exit. */ | |
7fafaac5 PM |
754 | while (!kthread_should_stop() || rbi.inflight) { |
755 | torture_shutdown_absorb("rcu_torture_boost"); | |
8e8be45e | 756 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 757 | } |
8e8be45e | 758 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ |
9d68197c | 759 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 760 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
761 | return 0; |
762 | } | |
763 | ||
38706bc5 PM |
764 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
765 | { | |
766 | } | |
767 | ||
768 | /* | |
769 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
770 | * to call_rcu() or analogous, increasing the probability of occurrence | |
771 | * of callback-overflow corner cases. | |
772 | */ | |
773 | static int | |
774 | rcu_torture_cbflood(void *arg) | |
775 | { | |
776 | int err = 1; | |
777 | int i; | |
778 | int j; | |
779 | struct rcu_head *rhp; | |
780 | ||
781 | if (cbflood_n_per_burst > 0 && | |
782 | cbflood_inter_holdoff > 0 && | |
783 | cbflood_intra_holdoff > 0 && | |
784 | cur_ops->call && | |
785 | cur_ops->cb_barrier) { | |
786 | rhp = vmalloc(sizeof(*rhp) * | |
787 | cbflood_n_burst * cbflood_n_per_burst); | |
788 | err = !rhp; | |
789 | } | |
790 | if (err) { | |
791 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
792 | while (!torture_must_stop()) | |
793 | schedule_timeout_interruptible(HZ); | |
794 | return 0; | |
795 | } | |
796 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
797 | do { | |
798 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
799 | atomic_long_inc(&n_cbfloods); | |
800 | WARN_ON(signal_pending(current)); | |
801 | for (i = 0; i < cbflood_n_burst; i++) { | |
802 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
803 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
804 | rcu_torture_cbflood_cb); | |
805 | } | |
806 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
807 | WARN_ON(signal_pending(current)); | |
808 | } | |
809 | cur_ops->cb_barrier(); | |
810 | stutter_wait("rcu_torture_cbflood"); | |
811 | } while (!torture_must_stop()); | |
b8969d1a | 812 | vfree(rhp); |
38706bc5 PM |
813 | torture_kthread_stopping("rcu_torture_cbflood"); |
814 | return 0; | |
815 | } | |
816 | ||
bf66f18e PM |
817 | /* |
818 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
819 | * bursts of calls to force_quiescent_state(), increasing the probability | |
820 | * of occurrence of some important types of race conditions. | |
821 | */ | |
822 | static int | |
823 | rcu_torture_fqs(void *arg) | |
824 | { | |
825 | unsigned long fqs_resume_time; | |
826 | int fqs_burst_remaining; | |
827 | ||
5ccf60f2 | 828 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
829 | do { |
830 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
831 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
832 | !kthread_should_stop()) { | |
bf66f18e PM |
833 | schedule_timeout_interruptible(1); |
834 | } | |
835 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
836 | while (fqs_burst_remaining > 0 && |
837 | !kthread_should_stop()) { | |
bf66f18e PM |
838 | cur_ops->fqs(); |
839 | udelay(fqs_holdoff); | |
840 | fqs_burst_remaining -= fqs_holdoff; | |
841 | } | |
628edaa5 | 842 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 843 | } while (!torture_must_stop()); |
7fafaac5 | 844 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
845 | return 0; |
846 | } | |
847 | ||
a241ec65 PM |
848 | /* |
849 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
850 | * for that pointed to by rcu_torture_current, freeing the old structure | |
851 | * after a series of grace periods (the "pipeline"). | |
852 | */ | |
853 | static int | |
854 | rcu_torture_writer(void *arg) | |
855 | { | |
4bb3c5f4 PM |
856 | bool can_expedite = !rcu_gp_is_expedited(); |
857 | int expediting = 0; | |
a48f3fad PM |
858 | unsigned long gp_snap; |
859 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 860 | bool gp_sync1 = gp_sync; |
a241ec65 | 861 | int i; |
a241ec65 PM |
862 | struct rcu_torture *rp; |
863 | struct rcu_torture *old_rp; | |
51b1130e | 864 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
865 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
866 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 867 | int nsynctypes = 0; |
a241ec65 | 868 | |
5ccf60f2 | 869 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
4bb3c5f4 PM |
870 | pr_alert("%s" TORTURE_FLAG |
871 | " Grace periods expedited from boot/sysfs for %s,\n", | |
872 | torture_type, cur_ops->name); | |
873 | pr_alert("%s" TORTURE_FLAG | |
874 | " Testing of dynamic grace-period expediting diabled.\n", | |
875 | torture_type); | |
dbdf65b1 | 876 | |
a48f3fad | 877 | /* Initialize synctype[] array. If none set, take default. */ |
f0bf8fab PM |
878 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync) |
879 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; | |
a48f3fad PM |
880 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
881 | synctype[nsynctypes++] = RTWS_COND_GET; | |
882 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
883 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
884 | if (gp_exp1 && cur_ops->exp_sync) | |
885 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
886 | else if (gp_exp && !cur_ops->exp_sync) | |
887 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
888 | if (gp_normal1 && cur_ops->deferred_free) | |
889 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
890 | else if (gp_normal && !cur_ops->deferred_free) | |
891 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
892 | if (gp_sync1 && cur_ops->sync) |
893 | synctype[nsynctypes++] = RTWS_SYNC; | |
894 | else if (gp_sync && !cur_ops->sync) | |
895 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
896 | if (WARN_ONCE(nsynctypes == 0, |
897 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
898 | /* |
899 | * No updates primitives, so don't try updating. | |
900 | * The resulting test won't be testing much, hence the | |
901 | * above WARN_ONCE(). | |
902 | */ | |
a48f3fad PM |
903 | rcu_torture_writer_state = RTWS_STOPPING; |
904 | torture_kthread_stopping("rcu_torture_writer"); | |
905 | } | |
906 | ||
a241ec65 | 907 | do { |
ad0dc7f9 | 908 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 909 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
910 | rp = rcu_torture_alloc(); |
911 | if (rp == NULL) | |
a241ec65 PM |
912 | continue; |
913 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 914 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 915 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 916 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
917 | old_rp = rcu_dereference_check(rcu_torture_current, |
918 | current == writer_task); | |
996417d2 | 919 | rp->rtort_mbtest = 1; |
a241ec65 | 920 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 921 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 922 | if (old_rp) { |
a241ec65 PM |
923 | i = old_rp->rtort_pipe_count; |
924 | if (i > RCU_TORTURE_PIPE_LEN) | |
925 | i = RCU_TORTURE_PIPE_LEN; | |
926 | atomic_inc(&rcu_torture_wcount[i]); | |
927 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
928 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
929 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 930 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 931 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
932 | break; |
933 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 934 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 935 | cur_ops->exp_sync(); |
a48f3fad PM |
936 | rcu_torture_pipe_update(old_rp); |
937 | break; | |
938 | case RTWS_COND_GET: | |
939 | rcu_torture_writer_state = RTWS_COND_GET; | |
940 | gp_snap = cur_ops->get_state(); | |
941 | i = torture_random(&rand) % 16; | |
942 | if (i != 0) | |
943 | schedule_timeout_interruptible(i); | |
944 | udelay(torture_random(&rand) % 1000); | |
945 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
946 | cur_ops->cond_sync(gp_snap); | |
947 | rcu_torture_pipe_update(old_rp); | |
948 | break; | |
f0bf8fab PM |
949 | case RTWS_SYNC: |
950 | rcu_torture_writer_state = RTWS_SYNC; | |
951 | cur_ops->sync(); | |
952 | rcu_torture_pipe_update(old_rp); | |
953 | break; | |
a48f3fad PM |
954 | default: |
955 | WARN_ON_ONCE(1); | |
956 | break; | |
2ec1f2d9 | 957 | } |
a241ec65 | 958 | } |
4a298656 | 959 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
960 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
961 | if (can_expedite && | |
962 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
963 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
964 | if (expediting >= 0) | |
965 | rcu_expedite_gp(); | |
966 | else | |
967 | rcu_unexpedite_gp(); | |
968 | if (++expediting > 3) | |
969 | expediting = -expediting; | |
970 | } | |
ad0dc7f9 | 971 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 972 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 973 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
974 | /* Reset expediting back to unexpedited. */ |
975 | if (expediting > 0) | |
976 | expediting = -expediting; | |
977 | while (can_expedite && expediting++ < 0) | |
978 | rcu_unexpedite_gp(); | |
979 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 980 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 981 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
982 | return 0; |
983 | } | |
984 | ||
b772e1dd JT |
985 | /* |
986 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
987 | * delay between calls. | |
988 | */ | |
989 | static int | |
990 | rcu_torture_fakewriter(void *arg) | |
991 | { | |
51b1130e | 992 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 993 | |
5ccf60f2 | 994 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 995 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
996 | |
997 | do { | |
51b1130e PM |
998 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
999 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1000 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1001 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1002 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1003 | } else if (gp_normal == gp_exp) { |
51b1130e | 1004 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1005 | cur_ops->sync(); |
1006 | else | |
1007 | cur_ops->exp_sync(); | |
1008 | } else if (gp_normal) { | |
72472a02 | 1009 | cur_ops->sync(); |
2ec1f2d9 PM |
1010 | } else { |
1011 | cur_ops->exp_sync(); | |
1012 | } | |
628edaa5 | 1013 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1014 | } while (!torture_must_stop()); |
b772e1dd | 1015 | |
7fafaac5 | 1016 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1017 | return 0; |
1018 | } | |
1019 | ||
b3b8a4d4 | 1020 | static void rcutorture_trace_dump(void) |
91afaf30 PM |
1021 | { |
1022 | static atomic_t beenhere = ATOMIC_INIT(0); | |
1023 | ||
1024 | if (atomic_read(&beenhere)) | |
1025 | return; | |
1026 | if (atomic_xchg(&beenhere, 1) != 0) | |
1027 | return; | |
91afaf30 PM |
1028 | ftrace_dump(DUMP_ALL); |
1029 | } | |
1030 | ||
0729fbf3 PM |
1031 | /* |
1032 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1033 | * incrementing the corresponding element of the pipeline array. The | |
1034 | * counter in the element should never be greater than 1, otherwise, the | |
1035 | * RCU implementation is broken. | |
1036 | */ | |
1037 | static void rcu_torture_timer(unsigned long unused) | |
1038 | { | |
1039 | int idx; | |
917963d0 | 1040 | unsigned long started; |
6b80da42 | 1041 | unsigned long completed; |
51b1130e | 1042 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1043 | static DEFINE_SPINLOCK(rand_lock); |
1044 | struct rcu_torture *p; | |
1045 | int pipe_count; | |
52494535 | 1046 | unsigned long long ts; |
0729fbf3 PM |
1047 | |
1048 | idx = cur_ops->readlock(); | |
917963d0 PM |
1049 | if (cur_ops->started) |
1050 | started = cur_ops->started(); | |
1051 | else | |
1052 | started = cur_ops->completed(); | |
e4aa0da3 | 1053 | ts = rcu_trace_clock_local(); |
632ee200 | 1054 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1055 | rcu_read_lock_bh_held() || |
1056 | rcu_read_lock_sched_held() || | |
1057 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
1058 | if (p == NULL) { |
1059 | /* Leave because rcu_torture_writer is not yet underway */ | |
1060 | cur_ops->readunlock(idx); | |
1061 | return; | |
1062 | } | |
1063 | if (p->rtort_mbtest == 0) | |
1064 | atomic_inc(&n_rcu_torture_mberror); | |
1065 | spin_lock(&rand_lock); | |
0acc512c | 1066 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1067 | n_rcu_torture_timers++; |
1068 | spin_unlock(&rand_lock); | |
1069 | preempt_disable(); | |
1070 | pipe_count = p->rtort_pipe_count; | |
1071 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1072 | /* Should not happen, but... */ | |
1073 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1074 | } | |
917963d0 | 1075 | completed = cur_ops->completed(); |
52494535 | 1076 | if (pipe_count > 1) { |
52494535 | 1077 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1078 | started, completed); |
91afaf30 | 1079 | rcutorture_trace_dump(); |
52494535 | 1080 | } |
dd17c8f7 | 1081 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1082 | completed = completed - started; |
1083 | if (cur_ops->started) | |
1084 | completed++; | |
0729fbf3 PM |
1085 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1086 | /* Should not happen, but... */ | |
1087 | completed = RCU_TORTURE_PIPE_LEN; | |
1088 | } | |
dd17c8f7 | 1089 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1090 | preempt_enable(); |
1091 | cur_ops->readunlock(idx); | |
1092 | } | |
1093 | ||
a241ec65 PM |
1094 | /* |
1095 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1096 | * incrementing the corresponding element of the pipeline array. The | |
1097 | * counter in the element should never be greater than 1, otherwise, the | |
1098 | * RCU implementation is broken. | |
1099 | */ | |
1100 | static int | |
1101 | rcu_torture_reader(void *arg) | |
1102 | { | |
917963d0 | 1103 | unsigned long started; |
6b80da42 | 1104 | unsigned long completed; |
72e9bb54 | 1105 | int idx; |
51b1130e | 1106 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1107 | struct rcu_torture *p; |
1108 | int pipe_count; | |
0729fbf3 | 1109 | struct timer_list t; |
52494535 | 1110 | unsigned long long ts; |
a241ec65 | 1111 | |
5ccf60f2 | 1112 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1113 | set_user_nice(current, MAX_NICE); |
0acc512c | 1114 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1115 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1116 | |
a241ec65 | 1117 | do { |
0acc512c | 1118 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1119 | if (!timer_pending(&t)) |
6155fec9 | 1120 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1121 | } |
72e9bb54 | 1122 | idx = cur_ops->readlock(); |
917963d0 PM |
1123 | if (cur_ops->started) |
1124 | started = cur_ops->started(); | |
1125 | else | |
1126 | started = cur_ops->completed(); | |
e4aa0da3 | 1127 | ts = rcu_trace_clock_local(); |
632ee200 | 1128 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1129 | rcu_read_lock_bh_held() || |
1130 | rcu_read_lock_sched_held() || | |
1131 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
1132 | if (p == NULL) { |
1133 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1134 | cur_ops->readunlock(idx); |
a241ec65 PM |
1135 | schedule_timeout_interruptible(HZ); |
1136 | continue; | |
1137 | } | |
996417d2 PM |
1138 | if (p->rtort_mbtest == 0) |
1139 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1140 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1141 | preempt_disable(); |
1142 | pipe_count = p->rtort_pipe_count; | |
1143 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1144 | /* Should not happen, but... */ | |
1145 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1146 | } | |
917963d0 | 1147 | completed = cur_ops->completed(); |
52494535 | 1148 | if (pipe_count > 1) { |
52494535 | 1149 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1150 | ts, started, completed); |
91afaf30 | 1151 | rcutorture_trace_dump(); |
52494535 | 1152 | } |
dd17c8f7 | 1153 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1154 | completed = completed - started; |
1155 | if (cur_ops->started) | |
1156 | completed++; | |
a241ec65 PM |
1157 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1158 | /* Should not happen, but... */ | |
1159 | completed = RCU_TORTURE_PIPE_LEN; | |
1160 | } | |
dd17c8f7 | 1161 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1162 | preempt_enable(); |
72e9bb54 | 1163 | cur_ops->readunlock(idx); |
bde6c3aa | 1164 | cond_resched_rcu_qs(); |
628edaa5 | 1165 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1166 | } while (!torture_must_stop()); |
424c1b68 | 1167 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1168 | del_timer_sync(&t); |
424c1b68 TG |
1169 | destroy_timer_on_stack(&t); |
1170 | } | |
7fafaac5 | 1171 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1172 | return 0; |
1173 | } | |
1174 | ||
1175 | /* | |
eea203fe JP |
1176 | * Print torture statistics. Caller must ensure that there is only |
1177 | * one call to this function at a given time!!! This is normally | |
1178 | * accomplished by relying on the module system to only have one copy | |
1179 | * of the module loaded, and then by giving the rcu_torture_stats | |
1180 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1181 | * thread is not running). | |
a241ec65 | 1182 | */ |
d1008950 | 1183 | static void |
eea203fe | 1184 | rcu_torture_stats_print(void) |
a241ec65 | 1185 | { |
a241ec65 PM |
1186 | int cpu; |
1187 | int i; | |
1188 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1189 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1190 | static unsigned long rtcv_snap = ULONG_MAX; |
a241ec65 | 1191 | |
0a945022 | 1192 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1193 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1194 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1195 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1196 | } | |
1197 | } | |
1198 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1199 | if (pipesummary[i] != 0) | |
1200 | break; | |
1201 | } | |
eea203fe JP |
1202 | |
1203 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1204 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1205 | rcu_torture_current, | |
1206 | rcu_torture_current_version, | |
1207 | list_empty(&rcu_torture_freelist), | |
1208 | atomic_read(&n_rcu_torture_alloc), | |
1209 | atomic_read(&n_rcu_torture_alloc_fail), | |
1210 | atomic_read(&n_rcu_torture_free)); | |
1211 | pr_cont("rtmbe: %d rtbke: %ld rtbre: %ld ", | |
1212 | atomic_read(&n_rcu_torture_mberror), | |
1213 | n_rcu_torture_boost_ktrerror, | |
1214 | n_rcu_torture_boost_rterror); | |
1215 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1216 | n_rcu_torture_boost_failure, | |
1217 | n_rcu_torture_boosts, | |
1218 | n_rcu_torture_timers); | |
1219 | torture_onoff_stats(); | |
38706bc5 | 1220 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1221 | n_barrier_successes, |
1222 | n_barrier_attempts, | |
1223 | n_rcu_torture_barrier_error); | |
38706bc5 | 1224 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1225 | |
1226 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1227 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1228 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1229 | n_rcu_torture_boost_ktrerror != 0 || |
1230 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1231 | n_rcu_torture_boost_failure != 0 || |
1232 | i > 1) { | |
eea203fe | 1233 | pr_cont("%s", "!!! "); |
996417d2 | 1234 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1235 | WARN_ON_ONCE(1); |
996417d2 | 1236 | } |
eea203fe | 1237 | pr_cont("Reader Pipe: "); |
a241ec65 | 1238 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1239 | pr_cont(" %ld", pipesummary[i]); |
1240 | pr_cont("\n"); | |
1241 | ||
1242 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1243 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1244 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1245 | pr_cont(" %ld", batchsummary[i]); |
1246 | pr_cont("\n"); | |
1247 | ||
1248 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1249 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1250 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1251 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1252 | } |
eea203fe JP |
1253 | pr_cont("\n"); |
1254 | ||
c8e5b163 | 1255 | if (cur_ops->stats) |
eea203fe | 1256 | cur_ops->stats(); |
ad0dc7f9 PM |
1257 | if (rtcv_snap == rcu_torture_current_version && |
1258 | rcu_torture_current != NULL) { | |
1259 | int __maybe_unused flags; | |
1260 | unsigned long __maybe_unused gpnum; | |
1261 | unsigned long __maybe_unused completed; | |
1262 | ||
1263 | rcutorture_get_gp_data(cur_ops->ttype, | |
1264 | &flags, &gpnum, &completed); | |
eea203fe JP |
1265 | pr_alert("??? Writer stall state %d g%lu c%lu f%#x\n", |
1266 | rcu_torture_writer_state, | |
1267 | gpnum, completed, flags); | |
afea227f | 1268 | show_rcu_gp_kthreads(); |
945fa9c6 | 1269 | rcutorture_trace_dump(); |
ad0dc7f9 PM |
1270 | } |
1271 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1272 | } |
1273 | ||
a241ec65 PM |
1274 | /* |
1275 | * Periodically prints torture statistics, if periodic statistics printing | |
1276 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1277 | */ |
1278 | static int | |
1279 | rcu_torture_stats(void *arg) | |
1280 | { | |
5ccf60f2 | 1281 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1282 | do { |
1283 | schedule_timeout_interruptible(stat_interval * HZ); | |
1284 | rcu_torture_stats_print(); | |
f67a3356 | 1285 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1286 | } while (!torture_must_stop()); |
7fafaac5 | 1287 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1288 | return 0; |
1289 | } | |
1290 | ||
95c38322 | 1291 | static inline void |
e66c33d5 | 1292 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1293 | { |
2caa1e44 PM |
1294 | pr_alert("%s" TORTURE_FLAG |
1295 | "--- %s: nreaders=%d nfakewriters=%d " | |
1296 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1297 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1298 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1299 | "test_boost=%d/%d test_boost_interval=%d " | |
1300 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1301 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1302 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1303 | "onoff_interval=%d onoff_holdoff=%d\n", |
1304 | torture_type, tag, nrealreaders, nfakewriters, | |
1305 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1306 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1307 | test_boost, cur_ops->can_boost, | |
1308 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1309 | stall_cpu, stall_cpu_holdoff, |
1310 | n_barrier_cbs, | |
2caa1e44 | 1311 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1312 | } |
1313 | ||
8e8be45e PM |
1314 | static void rcutorture_booster_cleanup(int cpu) |
1315 | { | |
1316 | struct task_struct *t; | |
1317 | ||
1318 | if (boost_tasks[cpu] == NULL) | |
1319 | return; | |
1320 | mutex_lock(&boost_mutex); | |
8e8be45e PM |
1321 | t = boost_tasks[cpu]; |
1322 | boost_tasks[cpu] = NULL; | |
1323 | mutex_unlock(&boost_mutex); | |
1324 | ||
1325 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1326 | torture_stop_kthread(rcu_torture_boost, t); |
8e8be45e PM |
1327 | } |
1328 | ||
1329 | static int rcutorture_booster_init(int cpu) | |
1330 | { | |
1331 | int retval; | |
1332 | ||
1333 | if (boost_tasks[cpu] != NULL) | |
1334 | return 0; /* Already created, nothing more to do. */ | |
1335 | ||
1336 | /* Don't allow time recalculation while creating a new task. */ | |
1337 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1338 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1339 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1340 | cpu_to_node(cpu), | |
1341 | "rcu_torture_boost"); | |
8e8be45e PM |
1342 | if (IS_ERR(boost_tasks[cpu])) { |
1343 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1344 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1345 | n_rcu_torture_boost_ktrerror++; |
1346 | boost_tasks[cpu] = NULL; | |
1347 | mutex_unlock(&boost_mutex); | |
1348 | return retval; | |
1349 | } | |
1350 | kthread_bind(boost_tasks[cpu], cpu); | |
1351 | wake_up_process(boost_tasks[cpu]); | |
1352 | mutex_unlock(&boost_mutex); | |
1353 | return 0; | |
1354 | } | |
1355 | ||
c13f3757 PM |
1356 | /* |
1357 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1358 | * induces a CPU stall for the time specified by stall_cpu. | |
1359 | */ | |
49fb4c62 | 1360 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1361 | { |
1362 | unsigned long stop_at; | |
1363 | ||
5ccf60f2 | 1364 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1365 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1366 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1367 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1368 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1369 | } |
1370 | if (!kthread_should_stop()) { | |
1371 | stop_at = get_seconds() + stall_cpu; | |
1372 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1373 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1374 | rcu_read_lock(); |
1375 | preempt_disable(); | |
1376 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1377 | continue; /* Induce RCU CPU stall warning. */ | |
1378 | preempt_enable(); | |
1379 | rcu_read_unlock(); | |
2caa1e44 | 1380 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1381 | } |
f67a3356 | 1382 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1383 | while (!kthread_should_stop()) |
1384 | schedule_timeout_interruptible(10 * HZ); | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1389 | static int __init rcu_torture_stall_init(void) | |
1390 | { | |
c13f3757 PM |
1391 | if (stall_cpu <= 0) |
1392 | return 0; | |
47cf29b9 | 1393 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1394 | } |
1395 | ||
fae4b54f | 1396 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1397 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1398 | { |
1399 | atomic_inc(&barrier_cbs_invoked); | |
1400 | } | |
1401 | ||
1402 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1403 | static int rcu_torture_barrier_cbs(void *arg) | |
1404 | { | |
1405 | long myid = (long)arg; | |
c6ebcbb6 | 1406 | bool lastphase = 0; |
78e4bc34 | 1407 | bool newphase; |
fae4b54f PM |
1408 | struct rcu_head rcu; |
1409 | ||
1410 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1411 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1412 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1413 | do { |
1414 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 PM |
1415 | (newphase = |
1416 | ACCESS_ONCE(barrier_phase)) != lastphase || | |
36970bb9 | 1417 | torture_must_stop()); |
78e4bc34 | 1418 | lastphase = newphase; |
c6ebcbb6 | 1419 | smp_mb(); /* ensure barrier_phase load before ->call(). */ |
36970bb9 | 1420 | if (torture_must_stop()) |
fae4b54f PM |
1421 | break; |
1422 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1423 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1424 | wake_up(&barrier_wq); | |
36970bb9 | 1425 | } while (!torture_must_stop()); |
69c60455 PM |
1426 | if (cur_ops->cb_barrier != NULL) |
1427 | cur_ops->cb_barrier(); | |
fae4b54f | 1428 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1429 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1430 | return 0; |
1431 | } | |
1432 | ||
1433 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1434 | static int rcu_torture_barrier(void *arg) | |
1435 | { | |
1436 | int i; | |
1437 | ||
5ccf60f2 | 1438 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1439 | do { |
1440 | atomic_set(&barrier_cbs_invoked, 0); | |
1441 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
c6ebcbb6 PM |
1442 | smp_mb(); /* Ensure barrier_phase after prior assignments. */ |
1443 | barrier_phase = !barrier_phase; | |
fae4b54f PM |
1444 | for (i = 0; i < n_barrier_cbs; i++) |
1445 | wake_up(&barrier_cbs_wq[i]); | |
1446 | wait_event(barrier_wq, | |
1447 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1448 | torture_must_stop()); |
1449 | if (torture_must_stop()) | |
fae4b54f PM |
1450 | break; |
1451 | n_barrier_attempts++; | |
78e4bc34 | 1452 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1453 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1454 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1455 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1456 | atomic_read(&barrier_cbs_invoked), | |
1457 | n_barrier_cbs); | |
fae4b54f PM |
1458 | WARN_ON_ONCE(1); |
1459 | } | |
1460 | n_barrier_successes++; | |
1461 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1462 | } while (!torture_must_stop()); |
7fafaac5 | 1463 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1464 | return 0; |
1465 | } | |
1466 | ||
1467 | /* Initialize RCU barrier testing. */ | |
1468 | static int rcu_torture_barrier_init(void) | |
1469 | { | |
1470 | int i; | |
1471 | int ret; | |
1472 | ||
1473 | if (n_barrier_cbs == 0) | |
1474 | return 0; | |
1475 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1476 | pr_alert("%s" TORTURE_FLAG |
1477 | " Call or barrier ops missing for %s,\n", | |
1478 | torture_type, cur_ops->name); | |
1479 | pr_alert("%s" TORTURE_FLAG | |
1480 | " RCU barrier testing omitted from run.\n", | |
1481 | torture_type); | |
fae4b54f PM |
1482 | return 0; |
1483 | } | |
1484 | atomic_set(&barrier_cbs_count, 0); | |
1485 | atomic_set(&barrier_cbs_invoked, 0); | |
1486 | barrier_cbs_tasks = | |
1487 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1488 | GFP_KERNEL); | |
1489 | barrier_cbs_wq = | |
1490 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1491 | GFP_KERNEL); | |
de5e6437 | 1492 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1493 | return -ENOMEM; |
1494 | for (i = 0; i < n_barrier_cbs; i++) { | |
1495 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1496 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1497 | (void *)(long)i, | |
1498 | barrier_cbs_tasks[i]); | |
1499 | if (ret) | |
fae4b54f | 1500 | return ret; |
fae4b54f | 1501 | } |
47cf29b9 | 1502 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1503 | } |
1504 | ||
1505 | /* Clean up after RCU barrier testing. */ | |
1506 | static void rcu_torture_barrier_cleanup(void) | |
1507 | { | |
1508 | int i; | |
1509 | ||
9c029b86 | 1510 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1511 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1512 | for (i = 0; i < n_barrier_cbs; i++) |
1513 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1514 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1515 | kfree(barrier_cbs_tasks); |
1516 | barrier_cbs_tasks = NULL; | |
1517 | } | |
1518 | if (barrier_cbs_wq != NULL) { | |
1519 | kfree(barrier_cbs_wq); | |
1520 | barrier_cbs_wq = NULL; | |
1521 | } | |
1522 | } | |
1523 | ||
8e8be45e PM |
1524 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1525 | unsigned long action, void *hcpu) | |
1526 | { | |
1527 | long cpu = (long)hcpu; | |
1528 | ||
1529 | switch (action) { | |
1530 | case CPU_ONLINE: | |
1531 | case CPU_DOWN_FAILED: | |
1532 | (void)rcutorture_booster_init(cpu); | |
1533 | break; | |
1534 | case CPU_DOWN_PREPARE: | |
1535 | rcutorture_booster_cleanup(cpu); | |
1536 | break; | |
1537 | default: | |
1538 | break; | |
1539 | } | |
1540 | return NOTIFY_OK; | |
1541 | } | |
1542 | ||
1543 | static struct notifier_block rcutorture_cpu_nb = { | |
1544 | .notifier_call = rcutorture_cpu_notify, | |
1545 | }; | |
1546 | ||
a241ec65 PM |
1547 | static void |
1548 | rcu_torture_cleanup(void) | |
1549 | { | |
1550 | int i; | |
1551 | ||
4a298656 | 1552 | rcutorture_record_test_transition(); |
d36a7a0d | 1553 | if (torture_cleanup_begin()) { |
343e9099 PM |
1554 | if (cur_ops->cb_barrier != NULL) |
1555 | cur_ops->cb_barrier(); | |
1556 | return; | |
1557 | } | |
d84f5203 | 1558 | |
fae4b54f | 1559 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1560 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1561 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1562 | |
c8e5b163 | 1563 | if (reader_tasks) { |
9c029b86 PM |
1564 | for (i = 0; i < nrealreaders; i++) |
1565 | torture_stop_kthread(rcu_torture_reader, | |
1566 | reader_tasks[i]); | |
a241ec65 | 1567 | kfree(reader_tasks); |
a241ec65 PM |
1568 | } |
1569 | rcu_torture_current = NULL; | |
1570 | ||
c8e5b163 | 1571 | if (fakewriter_tasks) { |
b772e1dd | 1572 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1573 | torture_stop_kthread(rcu_torture_fakewriter, |
1574 | fakewriter_tasks[i]); | |
b772e1dd JT |
1575 | } |
1576 | kfree(fakewriter_tasks); | |
1577 | fakewriter_tasks = NULL; | |
1578 | } | |
1579 | ||
9c029b86 PM |
1580 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1581 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1582 | for (i = 0; i < ncbflooders; i++) |
1583 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e PM |
1584 | if ((test_boost == 1 && cur_ops->can_boost) || |
1585 | test_boost == 2) { | |
1586 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1587 | for_each_possible_cpu(i) | |
1588 | rcutorture_booster_cleanup(i); | |
1589 | } | |
bf66f18e | 1590 | |
a241ec65 | 1591 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1592 | |
1593 | if (cur_ops->cb_barrier != NULL) | |
1594 | cur_ops->cb_barrier(); | |
a241ec65 | 1595 | |
a241ec65 | 1596 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1597 | |
fae4b54f | 1598 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1599 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1600 | else if (torture_onoff_failures()) |
091541bb PM |
1601 | rcu_torture_print_module_parms(cur_ops, |
1602 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1603 | else |
8e8be45e | 1604 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1605 | torture_cleanup_end(); |
a241ec65 PM |
1606 | } |
1607 | ||
d2818df1 PM |
1608 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1609 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1610 | { | |
1611 | } | |
1612 | ||
1613 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1614 | { | |
1615 | /* | |
1616 | * This -might- happen due to race conditions, but is unlikely. | |
1617 | * The scenario that leads to this happening is that the | |
1618 | * first of the pair of duplicate callbacks is queued, | |
1619 | * someone else starts a grace period that includes that | |
1620 | * callback, then the second of the pair must wait for the | |
1621 | * next grace period. Unlikely, but can happen. If it | |
1622 | * does happen, the debug-objects subsystem won't have splatted. | |
1623 | */ | |
1624 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1625 | } | |
1626 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1627 | ||
1628 | /* | |
1629 | * Verify that double-free causes debug-objects to complain, but only | |
1630 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1631 | * cannot be carried out. | |
1632 | */ | |
1633 | static void rcu_test_debug_objects(void) | |
1634 | { | |
1635 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1636 | struct rcu_head rh1; | |
1637 | struct rcu_head rh2; | |
1638 | ||
1639 | init_rcu_head_on_stack(&rh1); | |
1640 | init_rcu_head_on_stack(&rh2); | |
1641 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1642 | ||
1643 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1644 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1645 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1646 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1647 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1648 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1649 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1650 | local_irq_enable(); | |
1651 | rcu_read_unlock(); | |
1652 | preempt_enable(); | |
1653 | ||
1654 | /* Wait for them all to get done so we can safely return. */ | |
1655 | rcu_barrier(); | |
1656 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1657 | destroy_rcu_head_on_stack(&rh1); | |
1658 | destroy_rcu_head_on_stack(&rh2); | |
1659 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1660 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1661 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1662 | } | |
1663 | ||
6f8bc500 | 1664 | static int __init |
a241ec65 PM |
1665 | rcu_torture_init(void) |
1666 | { | |
1667 | int i; | |
1668 | int cpu; | |
1669 | int firsterr = 0; | |
2ec1f2d9 | 1670 | static struct rcu_torture_ops *torture_ops[] = { |
ff20e251 | 1671 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &sched_ops, |
69c60455 | 1672 | RCUTORTURE_TASKS_OPS |
2ec1f2d9 | 1673 | }; |
a241ec65 | 1674 | |
59da22a0 | 1675 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1676 | return -EBUSY; |
343e9099 | 1677 | |
a241ec65 | 1678 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1679 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1680 | cur_ops = torture_ops[i]; |
ade5fb81 | 1681 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1682 | break; |
72e9bb54 | 1683 | } |
ade5fb81 | 1684 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1685 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1686 | torture_type); | |
1687 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1688 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1689 | pr_alert(" %s", torture_ops[i]->name); |
1690 | pr_alert("\n"); | |
b5daa8f3 | 1691 | torture_init_end(); |
a71fca58 | 1692 | return -EINVAL; |
72e9bb54 | 1693 | } |
bf66f18e | 1694 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1695 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1696 | fqs_duration = 0; |
1697 | } | |
c8e5b163 | 1698 | if (cur_ops->init) |
72e9bb54 PM |
1699 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1700 | ||
64e4b43a | 1701 | if (nreaders >= 0) { |
a241ec65 | 1702 | nrealreaders = nreaders; |
64e4b43a PM |
1703 | } else { |
1704 | nrealreaders = num_online_cpus() - 1; | |
1705 | if (nrealreaders <= 0) | |
1706 | nrealreaders = 1; | |
1707 | } | |
8e8be45e | 1708 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1709 | |
1710 | /* Set up the freelist. */ | |
1711 | ||
1712 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1713 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1714 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1715 | list_add_tail(&rcu_tortures[i].rtort_free, |
1716 | &rcu_torture_freelist); | |
1717 | } | |
1718 | ||
1719 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1720 | ||
1721 | rcu_torture_current = NULL; | |
1722 | rcu_torture_current_version = 0; | |
1723 | atomic_set(&n_rcu_torture_alloc, 0); | |
1724 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1725 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1726 | atomic_set(&n_rcu_torture_mberror, 0); |
1727 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1728 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1729 | n_rcu_torture_boost_ktrerror = 0; |
1730 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1731 | n_rcu_torture_boost_failure = 0; |
1732 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1733 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1734 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1735 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1736 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1737 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1738 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | /* Start up the kthreads. */ | |
1743 | ||
47cf29b9 PM |
1744 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1745 | writer_task); | |
1746 | if (firsterr) | |
a241ec65 | 1747 | goto unwind; |
b772e1dd | 1748 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1749 | GFP_KERNEL); |
b772e1dd | 1750 | if (fakewriter_tasks == NULL) { |
5ccf60f2 | 1751 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
b772e1dd JT |
1752 | firsterr = -ENOMEM; |
1753 | goto unwind; | |
1754 | } | |
1755 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1756 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1757 | NULL, fakewriter_tasks[i]); | |
1758 | if (firsterr) | |
b772e1dd | 1759 | goto unwind; |
b772e1dd | 1760 | } |
2860aaba | 1761 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1762 | GFP_KERNEL); |
1763 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1764 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1765 | firsterr = -ENOMEM; |
1766 | goto unwind; | |
1767 | } | |
1768 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1769 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1770 | reader_tasks[i]); | |
1771 | if (firsterr) | |
a241ec65 | 1772 | goto unwind; |
a241ec65 PM |
1773 | } |
1774 | if (stat_interval > 0) { | |
47cf29b9 PM |
1775 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1776 | stats_task); | |
1777 | if (firsterr) | |
a241ec65 | 1778 | goto unwind; |
a241ec65 | 1779 | } |
d84f5203 | 1780 | if (test_no_idle_hz) { |
3808dc9f PM |
1781 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1782 | if (firsterr) | |
d84f5203 | 1783 | goto unwind; |
d84f5203 | 1784 | } |
d120f65f PM |
1785 | if (stutter < 0) |
1786 | stutter = 0; | |
1787 | if (stutter) { | |
628edaa5 PM |
1788 | firsterr = torture_stutter_init(stutter * HZ); |
1789 | if (firsterr) | |
d120f65f | 1790 | goto unwind; |
d120f65f | 1791 | } |
bf66f18e PM |
1792 | if (fqs_duration < 0) |
1793 | fqs_duration = 0; | |
1794 | if (fqs_duration) { | |
628edaa5 | 1795 | /* Create the fqs thread */ |
d0d0606e PM |
1796 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1797 | fqs_task); | |
47cf29b9 | 1798 | if (firsterr) |
bf66f18e | 1799 | goto unwind; |
bf66f18e | 1800 | } |
8e8be45e PM |
1801 | if (test_boost_interval < 1) |
1802 | test_boost_interval = 1; | |
1803 | if (test_boost_duration < 2) | |
1804 | test_boost_duration = 2; | |
1805 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1806 | test_boost == 2) { | |
8e8be45e PM |
1807 | |
1808 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1809 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1810 | for_each_possible_cpu(i) { | |
1811 | if (cpu_is_offline(i)) | |
1812 | continue; /* Heuristic: CPU can go offline. */ | |
01025ebc PM |
1813 | firsterr = rcutorture_booster_init(i); |
1814 | if (firsterr) | |
8e8be45e | 1815 | goto unwind; |
8e8be45e PM |
1816 | } |
1817 | } | |
01025ebc PM |
1818 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1819 | if (firsterr) | |
37e377d2 | 1820 | goto unwind; |
01025ebc PM |
1821 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1822 | if (firsterr) | |
37e377d2 | 1823 | goto unwind; |
01025ebc PM |
1824 | firsterr = rcu_torture_stall_init(); |
1825 | if (firsterr) | |
37e377d2 | 1826 | goto unwind; |
01025ebc PM |
1827 | firsterr = rcu_torture_barrier_init(); |
1828 | if (firsterr) | |
fae4b54f | 1829 | goto unwind; |
d2818df1 PM |
1830 | if (object_debug) |
1831 | rcu_test_debug_objects(); | |
38706bc5 PM |
1832 | if (cbflood_n_burst > 0) { |
1833 | /* Create the cbflood threads */ | |
1834 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1835 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1836 | GFP_KERNEL); | |
1837 | if (!cbflood_task) { | |
1838 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1839 | firsterr = -ENOMEM; | |
1840 | goto unwind; | |
1841 | } | |
1842 | for (i = 0; i < ncbflooders; i++) { | |
1843 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1844 | NULL, | |
1845 | cbflood_task[i]); | |
1846 | if (firsterr) | |
1847 | goto unwind; | |
1848 | } | |
1849 | } | |
4a298656 | 1850 | rcutorture_record_test_transition(); |
b5daa8f3 | 1851 | torture_init_end(); |
a241ec65 PM |
1852 | return 0; |
1853 | ||
1854 | unwind: | |
b5daa8f3 | 1855 | torture_init_end(); |
a241ec65 PM |
1856 | rcu_torture_cleanup(); |
1857 | return firsterr; | |
1858 | } | |
1859 | ||
1860 | module_init(rcu_torture_init); | |
1861 | module_exit(rcu_torture_cleanup); |