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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 | |
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); |
ca1d51ed | 244 | void (*cleanup)(void); |
72e9bb54 | 245 | int (*readlock)(void); |
51b1130e | 246 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 247 | void (*readunlock)(int idx); |
917963d0 | 248 | unsigned long (*started)(void); |
6b80da42 | 249 | unsigned long (*completed)(void); |
0acc512c | 250 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 251 | void (*sync)(void); |
2ec1f2d9 | 252 | void (*exp_sync)(void); |
a48f3fad PM |
253 | unsigned long (*get_state)(void); |
254 | void (*cond_sync)(unsigned long oldstate); | |
fae4b54f | 255 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 256 | void (*cb_barrier)(void); |
bf66f18e | 257 | void (*fqs)(void); |
eea203fe | 258 | void (*stats)(void); |
0acc512c | 259 | int irq_capable; |
8e8be45e | 260 | int can_boost; |
e66c33d5 | 261 | const char *name; |
72e9bb54 | 262 | }; |
a71fca58 PM |
263 | |
264 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
265 | |
266 | /* | |
267 | * Definitions for rcu torture testing. | |
268 | */ | |
269 | ||
a49a4af7 | 270 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
271 | { |
272 | rcu_read_lock(); | |
273 | return 0; | |
274 | } | |
275 | ||
51b1130e | 276 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 277 | { |
b8d57a76 JT |
278 | const unsigned long shortdelay_us = 200; |
279 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 280 | |
b8d57a76 JT |
281 | /* We want a short delay sometimes to make a reader delay the grace |
282 | * period, and we want a long delay occasionally to trigger | |
283 | * force_quiescent_state. */ | |
b2896d2e | 284 | |
51b1130e | 285 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 286 | mdelay(longdelay_ms); |
51b1130e | 287 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 288 | udelay(shortdelay_us); |
e546f485 | 289 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
290 | if (!preempt_count() && |
291 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
292 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
293 | #endif | |
b2896d2e PM |
294 | } |
295 | ||
a49a4af7 | 296 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
297 | { |
298 | rcu_read_unlock(); | |
299 | } | |
300 | ||
a48f3fad PM |
301 | /* |
302 | * Update callback in the pipe. This should be invoked after a grace period. | |
303 | */ | |
304 | static bool | |
305 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
306 | { | |
307 | int i; | |
308 | ||
309 | i = rp->rtort_pipe_count; | |
310 | if (i > RCU_TORTURE_PIPE_LEN) | |
311 | i = RCU_TORTURE_PIPE_LEN; | |
312 | atomic_inc(&rcu_torture_wcount[i]); | |
313 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
314 | rp->rtort_mbtest = 0; | |
315 | return true; | |
316 | } | |
317 | return false; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
322 | * primitives. | |
323 | */ | |
324 | static void | |
325 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
326 | { | |
327 | struct rcu_torture *rp; | |
328 | struct rcu_torture *rp1; | |
329 | ||
330 | if (old_rp) | |
331 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
332 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
333 | if (rcu_torture_pipe_update_one(rp)) { | |
334 | list_del(&rp->rtort_free); | |
335 | rcu_torture_free(rp); | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
72e9bb54 PM |
340 | static void |
341 | rcu_torture_cb(struct rcu_head *p) | |
342 | { | |
72e9bb54 PM |
343 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
344 | ||
36970bb9 | 345 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
346 | /* Test is ending, just drop callbacks on the floor. */ |
347 | /* The next initialization will pick up the pieces. */ | |
348 | return; | |
349 | } | |
a48f3fad | 350 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 351 | rcu_torture_free(rp); |
a48f3fad | 352 | else |
0acc512c | 353 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
354 | } |
355 | ||
6b80da42 | 356 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
357 | { |
358 | return 0; | |
359 | } | |
360 | ||
72e9bb54 PM |
361 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
362 | { | |
363 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
364 | } | |
365 | ||
e3033736 JT |
366 | static void rcu_sync_torture_init(void) |
367 | { | |
368 | INIT_LIST_HEAD(&rcu_torture_removed); | |
369 | } | |
370 | ||
2ec1f2d9 | 371 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 372 | .ttype = RCU_FLAVOR, |
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, | |
917963d0 | 377 | .started = rcu_batches_started, |
1e32eaee | 378 | .completed = rcu_batches_completed, |
2ec1f2d9 | 379 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 380 | .sync = synchronize_rcu, |
2ec1f2d9 | 381 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
382 | .get_state = get_state_synchronize_rcu, |
383 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
384 | .call = call_rcu, |
385 | .cb_barrier = rcu_barrier, | |
bf66f18e | 386 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
387 | .stats = NULL, |
388 | .irq_capable = 1, | |
8e8be45e | 389 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 390 | .name = "rcu" |
d9a3da06 PM |
391 | }; |
392 | ||
c32e0660 PM |
393 | /* |
394 | * Definitions for rcu_bh torture testing. | |
395 | */ | |
396 | ||
a49a4af7 | 397 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
398 | { |
399 | rcu_read_lock_bh(); | |
400 | return 0; | |
401 | } | |
402 | ||
a49a4af7 | 403 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
404 | { |
405 | rcu_read_unlock_bh(); | |
406 | } | |
407 | ||
c32e0660 PM |
408 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
409 | { | |
410 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
411 | } | |
412 | ||
413 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 414 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 415 | .init = rcu_sync_torture_init, |
0acc512c PM |
416 | .readlock = rcu_bh_torture_read_lock, |
417 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
418 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 419 | .started = rcu_batches_started_bh, |
1e32eaee | 420 | .completed = rcu_batches_completed_bh, |
0acc512c | 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 | ||
ff20e251 PM |
432 | /* |
433 | * Don't even think about trying any of these in real life!!! | |
434 | * The names includes "busted", and they really means it! | |
435 | * The only purpose of these functions is to provide a buggy RCU | |
436 | * implementation to make sure that rcutorture correctly emits | |
437 | * buggy-RCU error messages. | |
438 | */ | |
439 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
440 | { | |
441 | /* This is a deliberate bug for testing purposes only! */ | |
442 | rcu_torture_cb(&p->rtort_rcu); | |
443 | } | |
444 | ||
445 | static void synchronize_rcu_busted(void) | |
446 | { | |
447 | /* This is a deliberate bug for testing purposes only! */ | |
448 | } | |
449 | ||
450 | static void | |
451 | call_rcu_busted(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) | |
452 | { | |
453 | /* This is a deliberate bug for testing purposes only! */ | |
454 | func(head); | |
455 | } | |
456 | ||
457 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 458 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
459 | .init = rcu_sync_torture_init, |
460 | .readlock = rcu_torture_read_lock, | |
461 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
462 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 463 | .started = rcu_no_completed, |
ff20e251 PM |
464 | .completed = rcu_no_completed, |
465 | .deferred_free = rcu_busted_torture_deferred_free, | |
466 | .sync = synchronize_rcu_busted, | |
467 | .exp_sync = synchronize_rcu_busted, | |
468 | .call = call_rcu_busted, | |
469 | .cb_barrier = NULL, | |
470 | .fqs = NULL, | |
471 | .stats = NULL, | |
472 | .irq_capable = 1, | |
473 | .name = "rcu_busted" | |
474 | }; | |
475 | ||
b2896d2e PM |
476 | /* |
477 | * Definitions for srcu torture testing. | |
478 | */ | |
479 | ||
cda4dc81 | 480 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
481 | static struct srcu_struct srcu_ctld; |
482 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 483 | |
ca1d51ed | 484 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 485 | { |
ca1d51ed | 486 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
487 | } |
488 | ||
51b1130e | 489 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
490 | { |
491 | long delay; | |
492 | const long uspertick = 1000000 / HZ; | |
493 | const long longdelay = 10; | |
494 | ||
495 | /* We want there to be long-running readers, but not all the time. */ | |
496 | ||
51b1130e PM |
497 | delay = torture_random(rrsp) % |
498 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
499 | if (!delay) |
500 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
501 | else |
502 | rcu_read_delay(rrsp); | |
b2896d2e PM |
503 | } |
504 | ||
ca1d51ed | 505 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 506 | { |
ca1d51ed | 507 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
508 | } |
509 | ||
6b80da42 | 510 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 511 | { |
ca1d51ed | 512 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
513 | } |
514 | ||
9059c940 LJ |
515 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
516 | { | |
ca1d51ed | 517 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
518 | } |
519 | ||
b772e1dd JT |
520 | static void srcu_torture_synchronize(void) |
521 | { | |
ca1d51ed | 522 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
523 | } |
524 | ||
e3f8d378 PM |
525 | static void srcu_torture_call(struct rcu_head *head, |
526 | void (*func)(struct rcu_head *head)) | |
527 | { | |
ca1d51ed | 528 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
529 | } |
530 | ||
531 | static void srcu_torture_barrier(void) | |
532 | { | |
ca1d51ed | 533 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
534 | } |
535 | ||
eea203fe | 536 | static void srcu_torture_stats(void) |
b2896d2e | 537 | { |
b2896d2e | 538 | int cpu; |
ca1d51ed | 539 | int idx = srcu_ctlp->completed & 0x1; |
b2896d2e | 540 | |
eea203fe JP |
541 | pr_alert("%s%s per-CPU(idx=%d):", |
542 | torture_type, TORTURE_FLAG, idx); | |
b2896d2e | 543 | for_each_possible_cpu(cpu) { |
589a8f59 PM |
544 | long c0, c1; |
545 | ||
ca1d51ed PM |
546 | c0 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[!idx]; |
547 | c1 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[idx]; | |
eea203fe | 548 | pr_cont(" %d(%ld,%ld)", cpu, c0, c1); |
b2896d2e | 549 | } |
eea203fe | 550 | pr_cont("\n"); |
b2896d2e PM |
551 | } |
552 | ||
2ec1f2d9 PM |
553 | static void srcu_torture_synchronize_expedited(void) |
554 | { | |
ca1d51ed | 555 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
556 | } |
557 | ||
b2896d2e | 558 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 559 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 560 | .init = rcu_sync_torture_init, |
0acc512c PM |
561 | .readlock = srcu_torture_read_lock, |
562 | .read_delay = srcu_read_delay, | |
563 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 564 | .started = NULL, |
0acc512c | 565 | .completed = srcu_torture_completed, |
9059c940 | 566 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 567 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 568 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
569 | .call = srcu_torture_call, |
570 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
571 | .stats = srcu_torture_stats, |
572 | .name = "srcu" | |
b2896d2e PM |
573 | }; |
574 | ||
ca1d51ed PM |
575 | static void srcu_torture_init(void) |
576 | { | |
577 | rcu_sync_torture_init(); | |
578 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
579 | srcu_ctlp = &srcu_ctld; | |
580 | } | |
581 | ||
582 | static void srcu_torture_cleanup(void) | |
583 | { | |
584 | cleanup_srcu_struct(&srcu_ctld); | |
585 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ | |
586 | } | |
587 | ||
588 | /* As above, but dynamically allocated. */ | |
589 | static struct rcu_torture_ops srcud_ops = { | |
590 | .ttype = SRCU_FLAVOR, | |
591 | .init = srcu_torture_init, | |
592 | .cleanup = srcu_torture_cleanup, | |
593 | .readlock = srcu_torture_read_lock, | |
594 | .read_delay = srcu_read_delay, | |
595 | .readunlock = srcu_torture_read_unlock, | |
596 | .started = NULL, | |
597 | .completed = srcu_torture_completed, | |
598 | .deferred_free = srcu_torture_deferred_free, | |
599 | .sync = srcu_torture_synchronize, | |
600 | .exp_sync = srcu_torture_synchronize_expedited, | |
601 | .call = srcu_torture_call, | |
602 | .cb_barrier = srcu_torture_barrier, | |
603 | .stats = srcu_torture_stats, | |
604 | .name = "srcud" | |
605 | }; | |
606 | ||
4b6c2cca JT |
607 | /* |
608 | * Definitions for sched torture testing. | |
609 | */ | |
610 | ||
611 | static int sched_torture_read_lock(void) | |
612 | { | |
613 | preempt_disable(); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static void sched_torture_read_unlock(int idx) | |
618 | { | |
619 | preempt_enable(); | |
620 | } | |
621 | ||
2326974d PM |
622 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
623 | { | |
624 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
625 | } | |
626 | ||
4b6c2cca | 627 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 628 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 629 | .init = rcu_sync_torture_init, |
0acc512c PM |
630 | .readlock = sched_torture_read_lock, |
631 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
632 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 633 | .started = rcu_batches_started_sched, |
1e32eaee | 634 | .completed = rcu_batches_completed_sched, |
0acc512c | 635 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 636 | .sync = synchronize_sched, |
2ec1f2d9 | 637 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
638 | .get_state = get_state_synchronize_sched, |
639 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 640 | .call = call_rcu_sched, |
0acc512c | 641 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 642 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
643 | .stats = NULL, |
644 | .irq_capable = 1, | |
645 | .name = "sched" | |
4b6c2cca JT |
646 | }; |
647 | ||
69c60455 PM |
648 | #ifdef CONFIG_TASKS_RCU |
649 | ||
650 | /* | |
651 | * Definitions for RCU-tasks torture testing. | |
652 | */ | |
653 | ||
654 | static int tasks_torture_read_lock(void) | |
655 | { | |
656 | return 0; | |
657 | } | |
658 | ||
659 | static void tasks_torture_read_unlock(int idx) | |
660 | { | |
661 | } | |
662 | ||
663 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
664 | { | |
665 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
666 | } | |
667 | ||
668 | static struct rcu_torture_ops tasks_ops = { | |
669 | .ttype = RCU_TASKS_FLAVOR, | |
670 | .init = rcu_sync_torture_init, | |
671 | .readlock = tasks_torture_read_lock, | |
672 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
673 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 674 | .started = rcu_no_completed, |
69c60455 PM |
675 | .completed = rcu_no_completed, |
676 | .deferred_free = rcu_tasks_torture_deferred_free, | |
677 | .sync = synchronize_rcu_tasks, | |
678 | .exp_sync = synchronize_rcu_tasks, | |
679 | .call = call_rcu_tasks, | |
680 | .cb_barrier = rcu_barrier_tasks, | |
681 | .fqs = NULL, | |
682 | .stats = NULL, | |
683 | .irq_capable = 1, | |
684 | .name = "tasks" | |
685 | }; | |
686 | ||
687 | #define RCUTORTURE_TASKS_OPS &tasks_ops, | |
688 | ||
5be5d1a1 PM |
689 | static bool __maybe_unused torturing_tasks(void) |
690 | { | |
691 | return cur_ops == &tasks_ops; | |
692 | } | |
693 | ||
69c60455 PM |
694 | #else /* #ifdef CONFIG_TASKS_RCU */ |
695 | ||
696 | #define RCUTORTURE_TASKS_OPS | |
697 | ||
4f441a25 | 698 | static bool __maybe_unused torturing_tasks(void) |
5be5d1a1 PM |
699 | { |
700 | return false; | |
701 | } | |
702 | ||
69c60455 PM |
703 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ |
704 | ||
8e8be45e PM |
705 | /* |
706 | * RCU torture priority-boost testing. Runs one real-time thread per | |
707 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
708 | * spinning waiting for them to be invoked. If a given callback takes | |
709 | * too long to be invoked, we assume that priority inversion has occurred. | |
710 | */ | |
711 | ||
712 | struct rcu_boost_inflight { | |
713 | struct rcu_head rcu; | |
714 | int inflight; | |
715 | }; | |
716 | ||
717 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
718 | { | |
719 | struct rcu_boost_inflight *rbip = | |
720 | container_of(head, struct rcu_boost_inflight, rcu); | |
721 | ||
6c7ed42c PM |
722 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
723 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
724 | } |
725 | ||
726 | static int rcu_torture_boost(void *arg) | |
727 | { | |
728 | unsigned long call_rcu_time; | |
729 | unsigned long endtime; | |
730 | unsigned long oldstarttime; | |
731 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
732 | struct sched_param sp; | |
733 | ||
5ccf60f2 | 734 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
735 | |
736 | /* Set real-time priority. */ | |
737 | sp.sched_priority = 1; | |
738 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 739 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
740 | n_rcu_torture_boost_rterror++; |
741 | } | |
742 | ||
561190e3 | 743 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
744 | /* Each pass through the following loop does one boost-test cycle. */ |
745 | do { | |
746 | /* Wait for the next test interval. */ | |
747 | oldstarttime = boost_starttime; | |
93898fb1 | 748 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 749 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 750 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 751 | if (torture_must_stop()) |
8e8be45e PM |
752 | goto checkwait; |
753 | } | |
754 | ||
755 | /* Do one boost-test interval. */ | |
756 | endtime = oldstarttime + test_boost_duration * HZ; | |
757 | call_rcu_time = jiffies; | |
93898fb1 | 758 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 759 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
760 | if (!smp_load_acquire(&rbi.inflight)) { |
761 | /* RCU core before ->inflight = 1. */ | |
762 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e PM |
763 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
764 | if (jiffies - call_rcu_time > | |
765 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 766 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
767 | n_rcu_torture_boost_failure++; |
768 | } | |
769 | call_rcu_time = jiffies; | |
770 | } | |
bde6c3aa | 771 | cond_resched_rcu_qs(); |
628edaa5 | 772 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 773 | if (torture_must_stop()) |
8e8be45e PM |
774 | goto checkwait; |
775 | } | |
776 | ||
777 | /* | |
778 | * Set the start time of the next test interval. | |
779 | * Yes, this is vulnerable to long delays, but such | |
780 | * delays simply cause a false negative for the next | |
781 | * interval. Besides, we are running at RT priority, | |
782 | * so delays should be relatively rare. | |
783 | */ | |
ab8f11e5 PM |
784 | while (oldstarttime == boost_starttime && |
785 | !kthread_should_stop()) { | |
8e8be45e PM |
786 | if (mutex_trylock(&boost_mutex)) { |
787 | boost_starttime = jiffies + | |
788 | test_boost_interval * HZ; | |
789 | n_rcu_torture_boosts++; | |
790 | mutex_unlock(&boost_mutex); | |
791 | break; | |
792 | } | |
793 | schedule_timeout_uninterruptible(1); | |
794 | } | |
795 | ||
796 | /* Go do the stutter. */ | |
628edaa5 | 797 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 798 | } while (!torture_must_stop()); |
8e8be45e PM |
799 | |
800 | /* Clean up and exit. */ | |
6c7ed42c | 801 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 802 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 803 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 804 | } |
9d68197c | 805 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 806 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
807 | return 0; |
808 | } | |
809 | ||
38706bc5 PM |
810 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
811 | { | |
812 | } | |
813 | ||
814 | /* | |
815 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
816 | * to call_rcu() or analogous, increasing the probability of occurrence | |
817 | * of callback-overflow corner cases. | |
818 | */ | |
819 | static int | |
820 | rcu_torture_cbflood(void *arg) | |
821 | { | |
822 | int err = 1; | |
823 | int i; | |
824 | int j; | |
825 | struct rcu_head *rhp; | |
826 | ||
827 | if (cbflood_n_per_burst > 0 && | |
828 | cbflood_inter_holdoff > 0 && | |
829 | cbflood_intra_holdoff > 0 && | |
830 | cur_ops->call && | |
831 | cur_ops->cb_barrier) { | |
832 | rhp = vmalloc(sizeof(*rhp) * | |
833 | cbflood_n_burst * cbflood_n_per_burst); | |
834 | err = !rhp; | |
835 | } | |
836 | if (err) { | |
837 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 838 | goto wait_for_stop; |
38706bc5 PM |
839 | } |
840 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
841 | do { | |
842 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
843 | atomic_long_inc(&n_cbfloods); | |
844 | WARN_ON(signal_pending(current)); | |
845 | for (i = 0; i < cbflood_n_burst; i++) { | |
846 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
847 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
848 | rcu_torture_cbflood_cb); | |
849 | } | |
850 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
851 | WARN_ON(signal_pending(current)); | |
852 | } | |
853 | cur_ops->cb_barrier(); | |
854 | stutter_wait("rcu_torture_cbflood"); | |
855 | } while (!torture_must_stop()); | |
b8969d1a | 856 | vfree(rhp); |
3a0af333 | 857 | wait_for_stop: |
38706bc5 PM |
858 | torture_kthread_stopping("rcu_torture_cbflood"); |
859 | return 0; | |
860 | } | |
861 | ||
bf66f18e PM |
862 | /* |
863 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
864 | * bursts of calls to force_quiescent_state(), increasing the probability | |
865 | * of occurrence of some important types of race conditions. | |
866 | */ | |
867 | static int | |
868 | rcu_torture_fqs(void *arg) | |
869 | { | |
870 | unsigned long fqs_resume_time; | |
871 | int fqs_burst_remaining; | |
872 | ||
5ccf60f2 | 873 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
874 | do { |
875 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
876 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
877 | !kthread_should_stop()) { | |
bf66f18e PM |
878 | schedule_timeout_interruptible(1); |
879 | } | |
880 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
881 | while (fqs_burst_remaining > 0 && |
882 | !kthread_should_stop()) { | |
bf66f18e PM |
883 | cur_ops->fqs(); |
884 | udelay(fqs_holdoff); | |
885 | fqs_burst_remaining -= fqs_holdoff; | |
886 | } | |
628edaa5 | 887 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 888 | } while (!torture_must_stop()); |
7fafaac5 | 889 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
890 | return 0; |
891 | } | |
892 | ||
a241ec65 PM |
893 | /* |
894 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
895 | * for that pointed to by rcu_torture_current, freeing the old structure | |
896 | * after a series of grace periods (the "pipeline"). | |
897 | */ | |
898 | static int | |
899 | rcu_torture_writer(void *arg) | |
900 | { | |
4bb3c5f4 PM |
901 | bool can_expedite = !rcu_gp_is_expedited(); |
902 | int expediting = 0; | |
a48f3fad PM |
903 | unsigned long gp_snap; |
904 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 905 | bool gp_sync1 = gp_sync; |
a241ec65 | 906 | int i; |
a241ec65 PM |
907 | struct rcu_torture *rp; |
908 | struct rcu_torture *old_rp; | |
51b1130e | 909 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
910 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
911 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 912 | int nsynctypes = 0; |
a241ec65 | 913 | |
5ccf60f2 | 914 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
4bb3c5f4 PM |
915 | pr_alert("%s" TORTURE_FLAG |
916 | " Grace periods expedited from boot/sysfs for %s,\n", | |
917 | torture_type, cur_ops->name); | |
918 | pr_alert("%s" TORTURE_FLAG | |
919 | " Testing of dynamic grace-period expediting diabled.\n", | |
920 | torture_type); | |
dbdf65b1 | 921 | |
a48f3fad | 922 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 923 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 924 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
a48f3fad PM |
925 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
926 | synctype[nsynctypes++] = RTWS_COND_GET; | |
927 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
928 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
929 | if (gp_exp1 && cur_ops->exp_sync) | |
930 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
931 | else if (gp_exp && !cur_ops->exp_sync) | |
932 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
933 | if (gp_normal1 && cur_ops->deferred_free) | |
934 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
935 | else if (gp_normal && !cur_ops->deferred_free) | |
936 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
937 | if (gp_sync1 && cur_ops->sync) |
938 | synctype[nsynctypes++] = RTWS_SYNC; | |
939 | else if (gp_sync && !cur_ops->sync) | |
940 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
941 | if (WARN_ONCE(nsynctypes == 0, |
942 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
943 | /* |
944 | * No updates primitives, so don't try updating. | |
945 | * The resulting test won't be testing much, hence the | |
946 | * above WARN_ONCE(). | |
947 | */ | |
a48f3fad PM |
948 | rcu_torture_writer_state = RTWS_STOPPING; |
949 | torture_kthread_stopping("rcu_torture_writer"); | |
950 | } | |
951 | ||
a241ec65 | 952 | do { |
ad0dc7f9 | 953 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 954 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
955 | rp = rcu_torture_alloc(); |
956 | if (rp == NULL) | |
a241ec65 PM |
957 | continue; |
958 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 959 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 960 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 961 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
962 | old_rp = rcu_dereference_check(rcu_torture_current, |
963 | current == writer_task); | |
996417d2 | 964 | rp->rtort_mbtest = 1; |
a241ec65 | 965 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 966 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 967 | if (old_rp) { |
a241ec65 PM |
968 | i = old_rp->rtort_pipe_count; |
969 | if (i > RCU_TORTURE_PIPE_LEN) | |
970 | i = RCU_TORTURE_PIPE_LEN; | |
971 | atomic_inc(&rcu_torture_wcount[i]); | |
972 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
973 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
974 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 975 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 976 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
977 | break; |
978 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 979 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 980 | cur_ops->exp_sync(); |
a48f3fad PM |
981 | rcu_torture_pipe_update(old_rp); |
982 | break; | |
983 | case RTWS_COND_GET: | |
984 | rcu_torture_writer_state = RTWS_COND_GET; | |
985 | gp_snap = cur_ops->get_state(); | |
986 | i = torture_random(&rand) % 16; | |
987 | if (i != 0) | |
988 | schedule_timeout_interruptible(i); | |
989 | udelay(torture_random(&rand) % 1000); | |
990 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
991 | cur_ops->cond_sync(gp_snap); | |
992 | rcu_torture_pipe_update(old_rp); | |
993 | break; | |
f0bf8fab PM |
994 | case RTWS_SYNC: |
995 | rcu_torture_writer_state = RTWS_SYNC; | |
996 | cur_ops->sync(); | |
997 | rcu_torture_pipe_update(old_rp); | |
998 | break; | |
a48f3fad PM |
999 | default: |
1000 | WARN_ON_ONCE(1); | |
1001 | break; | |
2ec1f2d9 | 1002 | } |
a241ec65 | 1003 | } |
4a298656 | 1004 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
1005 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1006 | if (can_expedite && | |
1007 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1008 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1009 | if (expediting >= 0) | |
1010 | rcu_expedite_gp(); | |
1011 | else | |
1012 | rcu_unexpedite_gp(); | |
1013 | if (++expediting > 3) | |
1014 | expediting = -expediting; | |
1015 | } | |
ad0dc7f9 | 1016 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1017 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1018 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1019 | /* Reset expediting back to unexpedited. */ |
1020 | if (expediting > 0) | |
1021 | expediting = -expediting; | |
1022 | while (can_expedite && expediting++ < 0) | |
1023 | rcu_unexpedite_gp(); | |
1024 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 1025 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1026 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1027 | return 0; |
1028 | } | |
1029 | ||
b772e1dd JT |
1030 | /* |
1031 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1032 | * delay between calls. | |
1033 | */ | |
1034 | static int | |
1035 | rcu_torture_fakewriter(void *arg) | |
1036 | { | |
51b1130e | 1037 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1038 | |
5ccf60f2 | 1039 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1040 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1041 | |
1042 | do { | |
51b1130e PM |
1043 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1044 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1045 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1046 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1047 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1048 | } else if (gp_normal == gp_exp) { |
51b1130e | 1049 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1050 | cur_ops->sync(); |
1051 | else | |
1052 | cur_ops->exp_sync(); | |
1053 | } else if (gp_normal) { | |
72472a02 | 1054 | cur_ops->sync(); |
2ec1f2d9 PM |
1055 | } else { |
1056 | cur_ops->exp_sync(); | |
1057 | } | |
628edaa5 | 1058 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1059 | } while (!torture_must_stop()); |
b772e1dd | 1060 | |
7fafaac5 | 1061 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1062 | return 0; |
1063 | } | |
1064 | ||
b3b8a4d4 | 1065 | static void rcutorture_trace_dump(void) |
91afaf30 PM |
1066 | { |
1067 | static atomic_t beenhere = ATOMIC_INIT(0); | |
1068 | ||
1069 | if (atomic_read(&beenhere)) | |
1070 | return; | |
1071 | if (atomic_xchg(&beenhere, 1) != 0) | |
1072 | return; | |
91afaf30 PM |
1073 | ftrace_dump(DUMP_ALL); |
1074 | } | |
1075 | ||
0729fbf3 PM |
1076 | /* |
1077 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1078 | * incrementing the corresponding element of the pipeline array. The | |
1079 | * counter in the element should never be greater than 1, otherwise, the | |
1080 | * RCU implementation is broken. | |
1081 | */ | |
1082 | static void rcu_torture_timer(unsigned long unused) | |
1083 | { | |
1084 | int idx; | |
917963d0 | 1085 | unsigned long started; |
6b80da42 | 1086 | unsigned long completed; |
51b1130e | 1087 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1088 | static DEFINE_SPINLOCK(rand_lock); |
1089 | struct rcu_torture *p; | |
1090 | int pipe_count; | |
52494535 | 1091 | unsigned long long ts; |
0729fbf3 PM |
1092 | |
1093 | idx = cur_ops->readlock(); | |
917963d0 PM |
1094 | if (cur_ops->started) |
1095 | started = cur_ops->started(); | |
1096 | else | |
1097 | started = cur_ops->completed(); | |
e4aa0da3 | 1098 | ts = rcu_trace_clock_local(); |
632ee200 | 1099 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1100 | rcu_read_lock_bh_held() || |
1101 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1102 | srcu_read_lock_held(srcu_ctlp) || |
1103 | torturing_tasks()); | |
0729fbf3 PM |
1104 | if (p == NULL) { |
1105 | /* Leave because rcu_torture_writer is not yet underway */ | |
1106 | cur_ops->readunlock(idx); | |
1107 | return; | |
1108 | } | |
1109 | if (p->rtort_mbtest == 0) | |
1110 | atomic_inc(&n_rcu_torture_mberror); | |
1111 | spin_lock(&rand_lock); | |
0acc512c | 1112 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1113 | n_rcu_torture_timers++; |
1114 | spin_unlock(&rand_lock); | |
1115 | preempt_disable(); | |
1116 | pipe_count = p->rtort_pipe_count; | |
1117 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1118 | /* Should not happen, but... */ | |
1119 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1120 | } | |
917963d0 | 1121 | completed = cur_ops->completed(); |
52494535 | 1122 | if (pipe_count > 1) { |
52494535 | 1123 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1124 | started, completed); |
91afaf30 | 1125 | rcutorture_trace_dump(); |
52494535 | 1126 | } |
dd17c8f7 | 1127 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1128 | completed = completed - started; |
1129 | if (cur_ops->started) | |
1130 | completed++; | |
0729fbf3 PM |
1131 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1132 | /* Should not happen, but... */ | |
1133 | completed = RCU_TORTURE_PIPE_LEN; | |
1134 | } | |
dd17c8f7 | 1135 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1136 | preempt_enable(); |
1137 | cur_ops->readunlock(idx); | |
1138 | } | |
1139 | ||
a241ec65 PM |
1140 | /* |
1141 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1142 | * incrementing the corresponding element of the pipeline array. The | |
1143 | * counter in the element should never be greater than 1, otherwise, the | |
1144 | * RCU implementation is broken. | |
1145 | */ | |
1146 | static int | |
1147 | rcu_torture_reader(void *arg) | |
1148 | { | |
917963d0 | 1149 | unsigned long started; |
6b80da42 | 1150 | unsigned long completed; |
72e9bb54 | 1151 | int idx; |
51b1130e | 1152 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1153 | struct rcu_torture *p; |
1154 | int pipe_count; | |
0729fbf3 | 1155 | struct timer_list t; |
52494535 | 1156 | unsigned long long ts; |
a241ec65 | 1157 | |
5ccf60f2 | 1158 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1159 | set_user_nice(current, MAX_NICE); |
0acc512c | 1160 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1161 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1162 | |
a241ec65 | 1163 | do { |
0acc512c | 1164 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1165 | if (!timer_pending(&t)) |
6155fec9 | 1166 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1167 | } |
72e9bb54 | 1168 | idx = cur_ops->readlock(); |
917963d0 PM |
1169 | if (cur_ops->started) |
1170 | started = cur_ops->started(); | |
1171 | else | |
1172 | started = cur_ops->completed(); | |
e4aa0da3 | 1173 | ts = rcu_trace_clock_local(); |
632ee200 | 1174 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1175 | rcu_read_lock_bh_held() || |
1176 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1177 | srcu_read_lock_held(srcu_ctlp) || |
1178 | torturing_tasks()); | |
a241ec65 PM |
1179 | if (p == NULL) { |
1180 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1181 | cur_ops->readunlock(idx); |
a241ec65 PM |
1182 | schedule_timeout_interruptible(HZ); |
1183 | continue; | |
1184 | } | |
996417d2 PM |
1185 | if (p->rtort_mbtest == 0) |
1186 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1187 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1188 | preempt_disable(); |
1189 | pipe_count = p->rtort_pipe_count; | |
1190 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1191 | /* Should not happen, but... */ | |
1192 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1193 | } | |
917963d0 | 1194 | completed = cur_ops->completed(); |
52494535 | 1195 | if (pipe_count > 1) { |
52494535 | 1196 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1197 | ts, started, completed); |
91afaf30 | 1198 | rcutorture_trace_dump(); |
52494535 | 1199 | } |
dd17c8f7 | 1200 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1201 | completed = completed - started; |
1202 | if (cur_ops->started) | |
1203 | completed++; | |
a241ec65 PM |
1204 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1205 | /* Should not happen, but... */ | |
1206 | completed = RCU_TORTURE_PIPE_LEN; | |
1207 | } | |
dd17c8f7 | 1208 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1209 | preempt_enable(); |
72e9bb54 | 1210 | cur_ops->readunlock(idx); |
bde6c3aa | 1211 | cond_resched_rcu_qs(); |
628edaa5 | 1212 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1213 | } while (!torture_must_stop()); |
424c1b68 | 1214 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1215 | del_timer_sync(&t); |
424c1b68 TG |
1216 | destroy_timer_on_stack(&t); |
1217 | } | |
7fafaac5 | 1218 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1219 | return 0; |
1220 | } | |
1221 | ||
1222 | /* | |
eea203fe JP |
1223 | * Print torture statistics. Caller must ensure that there is only |
1224 | * one call to this function at a given time!!! This is normally | |
1225 | * accomplished by relying on the module system to only have one copy | |
1226 | * of the module loaded, and then by giving the rcu_torture_stats | |
1227 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1228 | * thread is not running). | |
a241ec65 | 1229 | */ |
d1008950 | 1230 | static void |
eea203fe | 1231 | rcu_torture_stats_print(void) |
a241ec65 | 1232 | { |
a241ec65 PM |
1233 | int cpu; |
1234 | int i; | |
1235 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1236 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1237 | static unsigned long rtcv_snap = ULONG_MAX; |
a241ec65 | 1238 | |
0a945022 | 1239 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1240 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1241 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1242 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1243 | } | |
1244 | } | |
1245 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1246 | if (pipesummary[i] != 0) | |
1247 | break; | |
1248 | } | |
eea203fe JP |
1249 | |
1250 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1251 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1252 | rcu_torture_current, | |
1253 | rcu_torture_current_version, | |
1254 | list_empty(&rcu_torture_freelist), | |
1255 | atomic_read(&n_rcu_torture_alloc), | |
1256 | atomic_read(&n_rcu_torture_alloc_fail), | |
1257 | atomic_read(&n_rcu_torture_free)); | |
1258 | pr_cont("rtmbe: %d rtbke: %ld rtbre: %ld ", | |
1259 | atomic_read(&n_rcu_torture_mberror), | |
1260 | n_rcu_torture_boost_ktrerror, | |
1261 | n_rcu_torture_boost_rterror); | |
1262 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1263 | n_rcu_torture_boost_failure, | |
1264 | n_rcu_torture_boosts, | |
1265 | n_rcu_torture_timers); | |
1266 | torture_onoff_stats(); | |
38706bc5 | 1267 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1268 | n_barrier_successes, |
1269 | n_barrier_attempts, | |
1270 | n_rcu_torture_barrier_error); | |
38706bc5 | 1271 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1272 | |
1273 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1274 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1275 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1276 | n_rcu_torture_boost_ktrerror != 0 || |
1277 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1278 | n_rcu_torture_boost_failure != 0 || |
1279 | i > 1) { | |
eea203fe | 1280 | pr_cont("%s", "!!! "); |
996417d2 | 1281 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1282 | WARN_ON_ONCE(1); |
996417d2 | 1283 | } |
eea203fe | 1284 | pr_cont("Reader Pipe: "); |
a241ec65 | 1285 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1286 | pr_cont(" %ld", pipesummary[i]); |
1287 | pr_cont("\n"); | |
1288 | ||
1289 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1290 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1291 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1292 | pr_cont(" %ld", batchsummary[i]); |
1293 | pr_cont("\n"); | |
1294 | ||
1295 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1296 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1297 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1298 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1299 | } |
eea203fe JP |
1300 | pr_cont("\n"); |
1301 | ||
c8e5b163 | 1302 | if (cur_ops->stats) |
eea203fe | 1303 | cur_ops->stats(); |
ad0dc7f9 PM |
1304 | if (rtcv_snap == rcu_torture_current_version && |
1305 | rcu_torture_current != NULL) { | |
1306 | int __maybe_unused flags; | |
1307 | unsigned long __maybe_unused gpnum; | |
1308 | unsigned long __maybe_unused completed; | |
1309 | ||
1310 | rcutorture_get_gp_data(cur_ops->ttype, | |
1311 | &flags, &gpnum, &completed); | |
eea203fe JP |
1312 | pr_alert("??? Writer stall state %d g%lu c%lu f%#x\n", |
1313 | rcu_torture_writer_state, | |
1314 | gpnum, completed, flags); | |
afea227f | 1315 | show_rcu_gp_kthreads(); |
945fa9c6 | 1316 | rcutorture_trace_dump(); |
ad0dc7f9 PM |
1317 | } |
1318 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1319 | } |
1320 | ||
a241ec65 PM |
1321 | /* |
1322 | * Periodically prints torture statistics, if periodic statistics printing | |
1323 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1324 | */ |
1325 | static int | |
1326 | rcu_torture_stats(void *arg) | |
1327 | { | |
5ccf60f2 | 1328 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1329 | do { |
1330 | schedule_timeout_interruptible(stat_interval * HZ); | |
1331 | rcu_torture_stats_print(); | |
f67a3356 | 1332 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1333 | } while (!torture_must_stop()); |
7fafaac5 | 1334 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1335 | return 0; |
1336 | } | |
1337 | ||
95c38322 | 1338 | static inline void |
e66c33d5 | 1339 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1340 | { |
2caa1e44 PM |
1341 | pr_alert("%s" TORTURE_FLAG |
1342 | "--- %s: nreaders=%d nfakewriters=%d " | |
1343 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1344 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1345 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1346 | "test_boost=%d/%d test_boost_interval=%d " | |
1347 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1348 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1349 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1350 | "onoff_interval=%d onoff_holdoff=%d\n", |
1351 | torture_type, tag, nrealreaders, nfakewriters, | |
1352 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1353 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1354 | test_boost, cur_ops->can_boost, | |
1355 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1356 | stall_cpu, stall_cpu_holdoff, |
1357 | n_barrier_cbs, | |
2caa1e44 | 1358 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1359 | } |
1360 | ||
8e8be45e PM |
1361 | static void rcutorture_booster_cleanup(int cpu) |
1362 | { | |
1363 | struct task_struct *t; | |
1364 | ||
1365 | if (boost_tasks[cpu] == NULL) | |
1366 | return; | |
1367 | mutex_lock(&boost_mutex); | |
8e8be45e PM |
1368 | t = boost_tasks[cpu]; |
1369 | boost_tasks[cpu] = NULL; | |
1370 | mutex_unlock(&boost_mutex); | |
1371 | ||
1372 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1373 | torture_stop_kthread(rcu_torture_boost, t); |
8e8be45e PM |
1374 | } |
1375 | ||
1376 | static int rcutorture_booster_init(int cpu) | |
1377 | { | |
1378 | int retval; | |
1379 | ||
1380 | if (boost_tasks[cpu] != NULL) | |
1381 | return 0; /* Already created, nothing more to do. */ | |
1382 | ||
1383 | /* Don't allow time recalculation while creating a new task. */ | |
1384 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1385 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1386 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1387 | cpu_to_node(cpu), | |
1388 | "rcu_torture_boost"); | |
8e8be45e PM |
1389 | if (IS_ERR(boost_tasks[cpu])) { |
1390 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1391 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1392 | n_rcu_torture_boost_ktrerror++; |
1393 | boost_tasks[cpu] = NULL; | |
1394 | mutex_unlock(&boost_mutex); | |
1395 | return retval; | |
1396 | } | |
1397 | kthread_bind(boost_tasks[cpu], cpu); | |
1398 | wake_up_process(boost_tasks[cpu]); | |
1399 | mutex_unlock(&boost_mutex); | |
1400 | return 0; | |
1401 | } | |
1402 | ||
c13f3757 PM |
1403 | /* |
1404 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1405 | * induces a CPU stall for the time specified by stall_cpu. | |
1406 | */ | |
49fb4c62 | 1407 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1408 | { |
1409 | unsigned long stop_at; | |
1410 | ||
5ccf60f2 | 1411 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1412 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1413 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1414 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1415 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1416 | } |
1417 | if (!kthread_should_stop()) { | |
1418 | stop_at = get_seconds() + stall_cpu; | |
1419 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1420 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1421 | rcu_read_lock(); |
1422 | preempt_disable(); | |
1423 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1424 | continue; /* Induce RCU CPU stall warning. */ | |
1425 | preempt_enable(); | |
1426 | rcu_read_unlock(); | |
2caa1e44 | 1427 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1428 | } |
f67a3356 | 1429 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1430 | while (!kthread_should_stop()) |
1431 | schedule_timeout_interruptible(10 * HZ); | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1436 | static int __init rcu_torture_stall_init(void) | |
1437 | { | |
c13f3757 PM |
1438 | if (stall_cpu <= 0) |
1439 | return 0; | |
47cf29b9 | 1440 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1441 | } |
1442 | ||
fae4b54f | 1443 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1444 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1445 | { |
1446 | atomic_inc(&barrier_cbs_invoked); | |
1447 | } | |
1448 | ||
1449 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1450 | static int rcu_torture_barrier_cbs(void *arg) | |
1451 | { | |
1452 | long myid = (long)arg; | |
c6ebcbb6 | 1453 | bool lastphase = 0; |
78e4bc34 | 1454 | bool newphase; |
fae4b54f PM |
1455 | struct rcu_head rcu; |
1456 | ||
1457 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1458 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1459 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1460 | do { |
1461 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1462 | (newphase = |
6c7ed42c | 1463 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1464 | torture_must_stop()); |
78e4bc34 | 1465 | lastphase = newphase; |
36970bb9 | 1466 | if (torture_must_stop()) |
fae4b54f | 1467 | break; |
6c7ed42c PM |
1468 | /* |
1469 | * The above smp_load_acquire() ensures barrier_phase load | |
1470 | * is ordered before the folloiwng ->call(). | |
1471 | */ | |
fae4b54f PM |
1472 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
1473 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1474 | wake_up(&barrier_wq); | |
36970bb9 | 1475 | } while (!torture_must_stop()); |
69c60455 PM |
1476 | if (cur_ops->cb_barrier != NULL) |
1477 | cur_ops->cb_barrier(); | |
fae4b54f | 1478 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1479 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1480 | return 0; |
1481 | } | |
1482 | ||
1483 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1484 | static int rcu_torture_barrier(void *arg) | |
1485 | { | |
1486 | int i; | |
1487 | ||
5ccf60f2 | 1488 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1489 | do { |
1490 | atomic_set(&barrier_cbs_invoked, 0); | |
1491 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1492 | /* Ensure barrier_phase ordered after prior assignments. */ |
1493 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1494 | for (i = 0; i < n_barrier_cbs; i++) |
1495 | wake_up(&barrier_cbs_wq[i]); | |
1496 | wait_event(barrier_wq, | |
1497 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1498 | torture_must_stop()); |
1499 | if (torture_must_stop()) | |
fae4b54f PM |
1500 | break; |
1501 | n_barrier_attempts++; | |
78e4bc34 | 1502 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1503 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1504 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1505 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1506 | atomic_read(&barrier_cbs_invoked), | |
1507 | n_barrier_cbs); | |
fae4b54f PM |
1508 | WARN_ON_ONCE(1); |
1509 | } | |
1510 | n_barrier_successes++; | |
1511 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1512 | } while (!torture_must_stop()); |
7fafaac5 | 1513 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1514 | return 0; |
1515 | } | |
1516 | ||
1517 | /* Initialize RCU barrier testing. */ | |
1518 | static int rcu_torture_barrier_init(void) | |
1519 | { | |
1520 | int i; | |
1521 | int ret; | |
1522 | ||
d9eba768 | 1523 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1524 | return 0; |
1525 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1526 | pr_alert("%s" TORTURE_FLAG |
1527 | " Call or barrier ops missing for %s,\n", | |
1528 | torture_type, cur_ops->name); | |
1529 | pr_alert("%s" TORTURE_FLAG | |
1530 | " RCU barrier testing omitted from run.\n", | |
1531 | torture_type); | |
fae4b54f PM |
1532 | return 0; |
1533 | } | |
1534 | atomic_set(&barrier_cbs_count, 0); | |
1535 | atomic_set(&barrier_cbs_invoked, 0); | |
1536 | barrier_cbs_tasks = | |
1537 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1538 | GFP_KERNEL); | |
1539 | barrier_cbs_wq = | |
1540 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1541 | GFP_KERNEL); | |
de5e6437 | 1542 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1543 | return -ENOMEM; |
1544 | for (i = 0; i < n_barrier_cbs; i++) { | |
1545 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1546 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1547 | (void *)(long)i, | |
1548 | barrier_cbs_tasks[i]); | |
1549 | if (ret) | |
fae4b54f | 1550 | return ret; |
fae4b54f | 1551 | } |
47cf29b9 | 1552 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1553 | } |
1554 | ||
1555 | /* Clean up after RCU barrier testing. */ | |
1556 | static void rcu_torture_barrier_cleanup(void) | |
1557 | { | |
1558 | int i; | |
1559 | ||
9c029b86 | 1560 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1561 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1562 | for (i = 0; i < n_barrier_cbs; i++) |
1563 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1564 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1565 | kfree(barrier_cbs_tasks); |
1566 | barrier_cbs_tasks = NULL; | |
1567 | } | |
1568 | if (barrier_cbs_wq != NULL) { | |
1569 | kfree(barrier_cbs_wq); | |
1570 | barrier_cbs_wq = NULL; | |
1571 | } | |
1572 | } | |
1573 | ||
8e8be45e PM |
1574 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1575 | unsigned long action, void *hcpu) | |
1576 | { | |
1577 | long cpu = (long)hcpu; | |
1578 | ||
1579 | switch (action) { | |
1580 | case CPU_ONLINE: | |
1581 | case CPU_DOWN_FAILED: | |
1582 | (void)rcutorture_booster_init(cpu); | |
1583 | break; | |
1584 | case CPU_DOWN_PREPARE: | |
1585 | rcutorture_booster_cleanup(cpu); | |
1586 | break; | |
1587 | default: | |
1588 | break; | |
1589 | } | |
1590 | return NOTIFY_OK; | |
1591 | } | |
1592 | ||
1593 | static struct notifier_block rcutorture_cpu_nb = { | |
1594 | .notifier_call = rcutorture_cpu_notify, | |
1595 | }; | |
1596 | ||
a241ec65 PM |
1597 | static void |
1598 | rcu_torture_cleanup(void) | |
1599 | { | |
1600 | int i; | |
1601 | ||
4a298656 | 1602 | rcutorture_record_test_transition(); |
d36a7a0d | 1603 | if (torture_cleanup_begin()) { |
343e9099 PM |
1604 | if (cur_ops->cb_barrier != NULL) |
1605 | cur_ops->cb_barrier(); | |
1606 | return; | |
1607 | } | |
d84f5203 | 1608 | |
fae4b54f | 1609 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1610 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1611 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1612 | |
c8e5b163 | 1613 | if (reader_tasks) { |
9c029b86 PM |
1614 | for (i = 0; i < nrealreaders; i++) |
1615 | torture_stop_kthread(rcu_torture_reader, | |
1616 | reader_tasks[i]); | |
a241ec65 | 1617 | kfree(reader_tasks); |
a241ec65 PM |
1618 | } |
1619 | rcu_torture_current = NULL; | |
1620 | ||
c8e5b163 | 1621 | if (fakewriter_tasks) { |
b772e1dd | 1622 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1623 | torture_stop_kthread(rcu_torture_fakewriter, |
1624 | fakewriter_tasks[i]); | |
b772e1dd JT |
1625 | } |
1626 | kfree(fakewriter_tasks); | |
1627 | fakewriter_tasks = NULL; | |
1628 | } | |
1629 | ||
9c029b86 PM |
1630 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1631 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1632 | for (i = 0; i < ncbflooders; i++) |
1633 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e PM |
1634 | if ((test_boost == 1 && cur_ops->can_boost) || |
1635 | test_boost == 2) { | |
1636 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1637 | for_each_possible_cpu(i) | |
1638 | rcutorture_booster_cleanup(i); | |
1639 | } | |
bf66f18e | 1640 | |
ca1d51ed PM |
1641 | /* |
1642 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1643 | * cleanup operations. | |
1644 | */ | |
2326974d PM |
1645 | if (cur_ops->cb_barrier != NULL) |
1646 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
1647 | if (cur_ops->cleanup != NULL) |
1648 | cur_ops->cleanup(); | |
a241ec65 | 1649 | |
a241ec65 | 1650 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1651 | |
fae4b54f | 1652 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1653 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1654 | else if (torture_onoff_failures()) |
091541bb PM |
1655 | rcu_torture_print_module_parms(cur_ops, |
1656 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1657 | else |
8e8be45e | 1658 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1659 | torture_cleanup_end(); |
a241ec65 PM |
1660 | } |
1661 | ||
d2818df1 PM |
1662 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1663 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1664 | { | |
1665 | } | |
1666 | ||
1667 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1668 | { | |
1669 | /* | |
1670 | * This -might- happen due to race conditions, but is unlikely. | |
1671 | * The scenario that leads to this happening is that the | |
1672 | * first of the pair of duplicate callbacks is queued, | |
1673 | * someone else starts a grace period that includes that | |
1674 | * callback, then the second of the pair must wait for the | |
1675 | * next grace period. Unlikely, but can happen. If it | |
1676 | * does happen, the debug-objects subsystem won't have splatted. | |
1677 | */ | |
1678 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1679 | } | |
1680 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1681 | ||
1682 | /* | |
1683 | * Verify that double-free causes debug-objects to complain, but only | |
1684 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1685 | * cannot be carried out. | |
1686 | */ | |
1687 | static void rcu_test_debug_objects(void) | |
1688 | { | |
1689 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1690 | struct rcu_head rh1; | |
1691 | struct rcu_head rh2; | |
1692 | ||
1693 | init_rcu_head_on_stack(&rh1); | |
1694 | init_rcu_head_on_stack(&rh2); | |
1695 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1696 | ||
1697 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1698 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1699 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1700 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1701 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1702 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1703 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1704 | local_irq_enable(); | |
1705 | rcu_read_unlock(); | |
1706 | preempt_enable(); | |
1707 | ||
1708 | /* Wait for them all to get done so we can safely return. */ | |
1709 | rcu_barrier(); | |
1710 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1711 | destroy_rcu_head_on_stack(&rh1); | |
1712 | destroy_rcu_head_on_stack(&rh2); | |
1713 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1714 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1715 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1716 | } | |
1717 | ||
6f8bc500 | 1718 | static int __init |
a241ec65 PM |
1719 | rcu_torture_init(void) |
1720 | { | |
1721 | int i; | |
1722 | int cpu; | |
1723 | int firsterr = 0; | |
2ec1f2d9 | 1724 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed PM |
1725 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
1726 | &sched_ops, RCUTORTURE_TASKS_OPS | |
2ec1f2d9 | 1727 | }; |
a241ec65 | 1728 | |
59da22a0 | 1729 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1730 | return -EBUSY; |
343e9099 | 1731 | |
a241ec65 | 1732 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1733 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1734 | cur_ops = torture_ops[i]; |
ade5fb81 | 1735 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1736 | break; |
72e9bb54 | 1737 | } |
ade5fb81 | 1738 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1739 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1740 | torture_type); | |
1741 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1742 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1743 | pr_alert(" %s", torture_ops[i]->name); |
1744 | pr_alert("\n"); | |
889d487a PM |
1745 | firsterr = -EINVAL; |
1746 | goto unwind; | |
72e9bb54 | 1747 | } |
bf66f18e | 1748 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1749 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1750 | fqs_duration = 0; |
1751 | } | |
c8e5b163 | 1752 | if (cur_ops->init) |
889d487a | 1753 | cur_ops->init(); |
72e9bb54 | 1754 | |
64e4b43a | 1755 | if (nreaders >= 0) { |
a241ec65 | 1756 | nrealreaders = nreaders; |
64e4b43a | 1757 | } else { |
3838cc18 | 1758 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
1759 | if (nrealreaders <= 0) |
1760 | nrealreaders = 1; | |
1761 | } | |
8e8be45e | 1762 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1763 | |
1764 | /* Set up the freelist. */ | |
1765 | ||
1766 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1767 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1768 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1769 | list_add_tail(&rcu_tortures[i].rtort_free, |
1770 | &rcu_torture_freelist); | |
1771 | } | |
1772 | ||
1773 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1774 | ||
1775 | rcu_torture_current = NULL; | |
1776 | rcu_torture_current_version = 0; | |
1777 | atomic_set(&n_rcu_torture_alloc, 0); | |
1778 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1779 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1780 | atomic_set(&n_rcu_torture_mberror, 0); |
1781 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1782 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1783 | n_rcu_torture_boost_ktrerror = 0; |
1784 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1785 | n_rcu_torture_boost_failure = 0; |
1786 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1787 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1788 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1789 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1790 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1791 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1792 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | /* Start up the kthreads. */ | |
1797 | ||
47cf29b9 PM |
1798 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1799 | writer_task); | |
1800 | if (firsterr) | |
a241ec65 | 1801 | goto unwind; |
4444d852 PM |
1802 | if (nfakewriters > 0) { |
1803 | fakewriter_tasks = kzalloc(nfakewriters * | |
1804 | sizeof(fakewriter_tasks[0]), | |
1805 | GFP_KERNEL); | |
1806 | if (fakewriter_tasks == NULL) { | |
1807 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1808 | firsterr = -ENOMEM; | |
1809 | goto unwind; | |
1810 | } | |
b772e1dd JT |
1811 | } |
1812 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1813 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1814 | NULL, fakewriter_tasks[i]); | |
1815 | if (firsterr) | |
b772e1dd | 1816 | goto unwind; |
b772e1dd | 1817 | } |
2860aaba | 1818 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1819 | GFP_KERNEL); |
1820 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1821 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1822 | firsterr = -ENOMEM; |
1823 | goto unwind; | |
1824 | } | |
1825 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1826 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1827 | reader_tasks[i]); | |
1828 | if (firsterr) | |
a241ec65 | 1829 | goto unwind; |
a241ec65 PM |
1830 | } |
1831 | if (stat_interval > 0) { | |
47cf29b9 PM |
1832 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1833 | stats_task); | |
1834 | if (firsterr) | |
a241ec65 | 1835 | goto unwind; |
a241ec65 | 1836 | } |
e8e255f7 | 1837 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
1838 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1839 | if (firsterr) | |
d84f5203 | 1840 | goto unwind; |
d84f5203 | 1841 | } |
d120f65f PM |
1842 | if (stutter < 0) |
1843 | stutter = 0; | |
1844 | if (stutter) { | |
628edaa5 PM |
1845 | firsterr = torture_stutter_init(stutter * HZ); |
1846 | if (firsterr) | |
d120f65f | 1847 | goto unwind; |
d120f65f | 1848 | } |
bf66f18e PM |
1849 | if (fqs_duration < 0) |
1850 | fqs_duration = 0; | |
1851 | if (fqs_duration) { | |
628edaa5 | 1852 | /* Create the fqs thread */ |
d0d0606e PM |
1853 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1854 | fqs_task); | |
47cf29b9 | 1855 | if (firsterr) |
bf66f18e | 1856 | goto unwind; |
bf66f18e | 1857 | } |
8e8be45e PM |
1858 | if (test_boost_interval < 1) |
1859 | test_boost_interval = 1; | |
1860 | if (test_boost_duration < 2) | |
1861 | test_boost_duration = 2; | |
1862 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1863 | test_boost == 2) { | |
8e8be45e PM |
1864 | |
1865 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1866 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1867 | for_each_possible_cpu(i) { | |
1868 | if (cpu_is_offline(i)) | |
1869 | continue; /* Heuristic: CPU can go offline. */ | |
01025ebc PM |
1870 | firsterr = rcutorture_booster_init(i); |
1871 | if (firsterr) | |
8e8be45e | 1872 | goto unwind; |
8e8be45e PM |
1873 | } |
1874 | } | |
01025ebc PM |
1875 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1876 | if (firsterr) | |
37e377d2 | 1877 | goto unwind; |
01025ebc PM |
1878 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1879 | if (firsterr) | |
37e377d2 | 1880 | goto unwind; |
01025ebc PM |
1881 | firsterr = rcu_torture_stall_init(); |
1882 | if (firsterr) | |
37e377d2 | 1883 | goto unwind; |
01025ebc PM |
1884 | firsterr = rcu_torture_barrier_init(); |
1885 | if (firsterr) | |
fae4b54f | 1886 | goto unwind; |
d2818df1 PM |
1887 | if (object_debug) |
1888 | rcu_test_debug_objects(); | |
38706bc5 PM |
1889 | if (cbflood_n_burst > 0) { |
1890 | /* Create the cbflood threads */ | |
1891 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1892 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1893 | GFP_KERNEL); | |
1894 | if (!cbflood_task) { | |
1895 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1896 | firsterr = -ENOMEM; | |
1897 | goto unwind; | |
1898 | } | |
1899 | for (i = 0; i < ncbflooders; i++) { | |
1900 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1901 | NULL, | |
1902 | cbflood_task[i]); | |
1903 | if (firsterr) | |
1904 | goto unwind; | |
1905 | } | |
1906 | } | |
4a298656 | 1907 | rcutorture_record_test_transition(); |
b5daa8f3 | 1908 | torture_init_end(); |
a241ec65 PM |
1909 | return 0; |
1910 | ||
1911 | unwind: | |
b5daa8f3 | 1912 | torture_init_end(); |
a241ec65 PM |
1913 | rcu_torture_cleanup(); |
1914 | return firsterr; | |
1915 | } | |
1916 | ||
1917 | module_init(rcu_torture_init); | |
1918 | module_exit(rcu_torture_cleanup); |