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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); | |
67522bee PM |
133 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count); |
134 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch); | |
a241ec65 | 135 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
136 | static atomic_t n_rcu_torture_alloc; |
137 | static atomic_t n_rcu_torture_alloc_fail; | |
138 | static atomic_t n_rcu_torture_free; | |
139 | static atomic_t n_rcu_torture_mberror; | |
140 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 141 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
142 | static long n_rcu_torture_boost_ktrerror; |
143 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
144 | static long n_rcu_torture_boost_failure; |
145 | static long n_rcu_torture_boosts; | |
a71fca58 | 146 | static long n_rcu_torture_timers; |
fae4b54f PM |
147 | static long n_barrier_attempts; |
148 | static long n_barrier_successes; | |
38706bc5 | 149 | static atomic_long_t n_cbfloods; |
e3033736 | 150 | static struct list_head rcu_torture_removed; |
d120f65f | 151 | |
ad0dc7f9 PM |
152 | static int rcu_torture_writer_state; |
153 | #define RTWS_FIXED_DELAY 0 | |
154 | #define RTWS_DELAY 1 | |
155 | #define RTWS_REPLACE 2 | |
156 | #define RTWS_DEF_FREE 3 | |
157 | #define RTWS_EXP_SYNC 4 | |
a48f3fad PM |
158 | #define RTWS_COND_GET 5 |
159 | #define RTWS_COND_SYNC 6 | |
f0bf8fab PM |
160 | #define RTWS_SYNC 7 |
161 | #define RTWS_STUTTER 8 | |
162 | #define RTWS_STOPPING 9 | |
18aff33e PM |
163 | static const char * const rcu_torture_writer_state_names[] = { |
164 | "RTWS_FIXED_DELAY", | |
165 | "RTWS_DELAY", | |
166 | "RTWS_REPLACE", | |
167 | "RTWS_DEF_FREE", | |
168 | "RTWS_EXP_SYNC", | |
169 | "RTWS_COND_GET", | |
170 | "RTWS_COND_SYNC", | |
171 | "RTWS_SYNC", | |
172 | "RTWS_STUTTER", | |
173 | "RTWS_STOPPING", | |
174 | }; | |
175 | ||
176 | static const char *rcu_torture_writer_state_getname(void) | |
177 | { | |
178 | unsigned int i = READ_ONCE(rcu_torture_writer_state); | |
179 | ||
180 | if (i >= ARRAY_SIZE(rcu_torture_writer_state_names)) | |
181 | return "???"; | |
182 | return rcu_torture_writer_state_names[i]; | |
183 | } | |
ad0dc7f9 | 184 | |
31a72bce PM |
185 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
186 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
187 | #else | |
188 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
189 | #endif | |
59da22a0 PM |
190 | static int torture_runnable = RCUTORTURE_RUNNABLE_INIT; |
191 | module_param(torture_runnable, int, 0444); | |
192 | MODULE_PARM_DESC(torture_runnable, "Start rcutorture at boot"); | |
31a72bce | 193 | |
3acf4a9a | 194 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 195 | #define rcu_can_boost() 1 |
3acf4a9a | 196 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 197 | #define rcu_can_boost() 0 |
3acf4a9a | 198 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 199 | |
e4aa0da3 SR |
200 | #ifdef CONFIG_RCU_TRACE |
201 | static u64 notrace rcu_trace_clock_local(void) | |
202 | { | |
203 | u64 ts = trace_clock_local(); | |
204 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
205 | return ts; | |
206 | } | |
207 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
208 | static u64 notrace rcu_trace_clock_local(void) | |
209 | { | |
210 | return 0ULL; | |
211 | } | |
212 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
213 | ||
8e8be45e | 214 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 215 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 216 | /* and boost task create/destroy. */ |
fae4b54f | 217 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 218 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
219 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
220 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
221 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 222 | |
a241ec65 PM |
223 | /* |
224 | * Allocate an element from the rcu_tortures pool. | |
225 | */ | |
97a41e26 | 226 | static struct rcu_torture * |
a241ec65 PM |
227 | rcu_torture_alloc(void) |
228 | { | |
229 | struct list_head *p; | |
230 | ||
adac1665 | 231 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
232 | if (list_empty(&rcu_torture_freelist)) { |
233 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 234 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
235 | return NULL; |
236 | } | |
237 | atomic_inc(&n_rcu_torture_alloc); | |
238 | p = rcu_torture_freelist.next; | |
239 | list_del_init(p); | |
adac1665 | 240 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
241 | return container_of(p, struct rcu_torture, rtort_free); |
242 | } | |
243 | ||
244 | /* | |
245 | * Free an element to the rcu_tortures pool. | |
246 | */ | |
247 | static void | |
248 | rcu_torture_free(struct rcu_torture *p) | |
249 | { | |
250 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 251 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 252 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 253 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
254 | } |
255 | ||
72e9bb54 PM |
256 | /* |
257 | * Operations vector for selecting different types of tests. | |
258 | */ | |
259 | ||
260 | struct rcu_torture_ops { | |
ad0dc7f9 | 261 | int ttype; |
72e9bb54 | 262 | void (*init)(void); |
ca1d51ed | 263 | void (*cleanup)(void); |
72e9bb54 | 264 | int (*readlock)(void); |
51b1130e | 265 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 266 | void (*readunlock)(int idx); |
917963d0 | 267 | unsigned long (*started)(void); |
6b80da42 | 268 | unsigned long (*completed)(void); |
0acc512c | 269 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 270 | void (*sync)(void); |
2ec1f2d9 | 271 | void (*exp_sync)(void); |
a48f3fad PM |
272 | unsigned long (*get_state)(void); |
273 | void (*cond_sync)(unsigned long oldstate); | |
db3e8db4 | 274 | call_rcu_func_t call; |
2326974d | 275 | void (*cb_barrier)(void); |
bf66f18e | 276 | void (*fqs)(void); |
eea203fe | 277 | void (*stats)(void); |
0acc512c | 278 | int irq_capable; |
8e8be45e | 279 | int can_boost; |
e66c33d5 | 280 | const char *name; |
72e9bb54 | 281 | }; |
a71fca58 PM |
282 | |
283 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
284 | |
285 | /* | |
286 | * Definitions for rcu torture testing. | |
287 | */ | |
288 | ||
a49a4af7 | 289 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
290 | { |
291 | rcu_read_lock(); | |
292 | return 0; | |
293 | } | |
294 | ||
51b1130e | 295 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 296 | { |
b8d57a76 JT |
297 | const unsigned long shortdelay_us = 200; |
298 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 299 | |
b8d57a76 JT |
300 | /* We want a short delay sometimes to make a reader delay the grace |
301 | * period, and we want a long delay occasionally to trigger | |
302 | * force_quiescent_state. */ | |
b2896d2e | 303 | |
51b1130e | 304 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 305 | mdelay(longdelay_ms); |
51b1130e | 306 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 307 | udelay(shortdelay_us); |
e546f485 | 308 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
309 | if (!preempt_count() && |
310 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
311 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
312 | #endif | |
b2896d2e PM |
313 | } |
314 | ||
a49a4af7 | 315 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
316 | { |
317 | rcu_read_unlock(); | |
318 | } | |
319 | ||
a48f3fad PM |
320 | /* |
321 | * Update callback in the pipe. This should be invoked after a grace period. | |
322 | */ | |
323 | static bool | |
324 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
325 | { | |
326 | int i; | |
327 | ||
328 | i = rp->rtort_pipe_count; | |
329 | if (i > RCU_TORTURE_PIPE_LEN) | |
330 | i = RCU_TORTURE_PIPE_LEN; | |
331 | atomic_inc(&rcu_torture_wcount[i]); | |
332 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
333 | rp->rtort_mbtest = 0; | |
334 | return true; | |
335 | } | |
336 | return false; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
341 | * primitives. | |
342 | */ | |
343 | static void | |
344 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
345 | { | |
346 | struct rcu_torture *rp; | |
347 | struct rcu_torture *rp1; | |
348 | ||
349 | if (old_rp) | |
350 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
351 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
352 | if (rcu_torture_pipe_update_one(rp)) { | |
353 | list_del(&rp->rtort_free); | |
354 | rcu_torture_free(rp); | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
72e9bb54 PM |
359 | static void |
360 | rcu_torture_cb(struct rcu_head *p) | |
361 | { | |
72e9bb54 PM |
362 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
363 | ||
36970bb9 | 364 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
365 | /* Test is ending, just drop callbacks on the floor. */ |
366 | /* The next initialization will pick up the pieces. */ | |
367 | return; | |
368 | } | |
a48f3fad | 369 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 370 | rcu_torture_free(rp); |
a48f3fad | 371 | else |
0acc512c | 372 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
373 | } |
374 | ||
6b80da42 | 375 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
376 | { |
377 | return 0; | |
378 | } | |
379 | ||
72e9bb54 PM |
380 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
381 | { | |
382 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
383 | } | |
384 | ||
e3033736 JT |
385 | static void rcu_sync_torture_init(void) |
386 | { | |
387 | INIT_LIST_HEAD(&rcu_torture_removed); | |
388 | } | |
389 | ||
2ec1f2d9 | 390 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 391 | .ttype = RCU_FLAVOR, |
0acc512c | 392 | .init = rcu_sync_torture_init, |
0acc512c PM |
393 | .readlock = rcu_torture_read_lock, |
394 | .read_delay = rcu_read_delay, | |
395 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 396 | .started = rcu_batches_started, |
1e32eaee | 397 | .completed = rcu_batches_completed, |
2ec1f2d9 | 398 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 399 | .sync = synchronize_rcu, |
2ec1f2d9 | 400 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
401 | .get_state = get_state_synchronize_rcu, |
402 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
403 | .call = call_rcu, |
404 | .cb_barrier = rcu_barrier, | |
bf66f18e | 405 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
406 | .stats = NULL, |
407 | .irq_capable = 1, | |
8e8be45e | 408 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 409 | .name = "rcu" |
d9a3da06 PM |
410 | }; |
411 | ||
c32e0660 PM |
412 | /* |
413 | * Definitions for rcu_bh torture testing. | |
414 | */ | |
415 | ||
a49a4af7 | 416 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
417 | { |
418 | rcu_read_lock_bh(); | |
419 | return 0; | |
420 | } | |
421 | ||
a49a4af7 | 422 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
423 | { |
424 | rcu_read_unlock_bh(); | |
425 | } | |
426 | ||
c32e0660 PM |
427 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
428 | { | |
429 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
430 | } | |
431 | ||
432 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 433 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 434 | .init = rcu_sync_torture_init, |
0acc512c PM |
435 | .readlock = rcu_bh_torture_read_lock, |
436 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
437 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 438 | .started = rcu_batches_started_bh, |
1e32eaee | 439 | .completed = rcu_batches_completed_bh, |
0acc512c | 440 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 441 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 442 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 443 | .call = call_rcu_bh, |
0acc512c | 444 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 445 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
446 | .stats = NULL, |
447 | .irq_capable = 1, | |
448 | .name = "rcu_bh" | |
c32e0660 PM |
449 | }; |
450 | ||
ff20e251 PM |
451 | /* |
452 | * Don't even think about trying any of these in real life!!! | |
453 | * The names includes "busted", and they really means it! | |
454 | * The only purpose of these functions is to provide a buggy RCU | |
455 | * implementation to make sure that rcutorture correctly emits | |
456 | * buggy-RCU error messages. | |
457 | */ | |
458 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
459 | { | |
460 | /* This is a deliberate bug for testing purposes only! */ | |
461 | rcu_torture_cb(&p->rtort_rcu); | |
462 | } | |
463 | ||
464 | static void synchronize_rcu_busted(void) | |
465 | { | |
466 | /* This is a deliberate bug for testing purposes only! */ | |
467 | } | |
468 | ||
469 | static void | |
b6a4ae76 | 470 | call_rcu_busted(struct rcu_head *head, rcu_callback_t func) |
ff20e251 PM |
471 | { |
472 | /* This is a deliberate bug for testing purposes only! */ | |
473 | func(head); | |
474 | } | |
475 | ||
476 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 477 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
478 | .init = rcu_sync_torture_init, |
479 | .readlock = rcu_torture_read_lock, | |
480 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
481 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 482 | .started = rcu_no_completed, |
ff20e251 PM |
483 | .completed = rcu_no_completed, |
484 | .deferred_free = rcu_busted_torture_deferred_free, | |
485 | .sync = synchronize_rcu_busted, | |
486 | .exp_sync = synchronize_rcu_busted, | |
487 | .call = call_rcu_busted, | |
488 | .cb_barrier = NULL, | |
489 | .fqs = NULL, | |
490 | .stats = NULL, | |
491 | .irq_capable = 1, | |
492 | .name = "rcu_busted" | |
493 | }; | |
494 | ||
b2896d2e PM |
495 | /* |
496 | * Definitions for srcu torture testing. | |
497 | */ | |
498 | ||
cda4dc81 | 499 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
500 | static struct srcu_struct srcu_ctld; |
501 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 502 | |
ca1d51ed | 503 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 504 | { |
ca1d51ed | 505 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
506 | } |
507 | ||
51b1130e | 508 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
509 | { |
510 | long delay; | |
511 | const long uspertick = 1000000 / HZ; | |
512 | const long longdelay = 10; | |
513 | ||
514 | /* We want there to be long-running readers, but not all the time. */ | |
515 | ||
51b1130e PM |
516 | delay = torture_random(rrsp) % |
517 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
518 | if (!delay) |
519 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
520 | else |
521 | rcu_read_delay(rrsp); | |
b2896d2e PM |
522 | } |
523 | ||
ca1d51ed | 524 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 525 | { |
ca1d51ed | 526 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
527 | } |
528 | ||
6b80da42 | 529 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 530 | { |
ca1d51ed | 531 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
532 | } |
533 | ||
9059c940 LJ |
534 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
535 | { | |
ca1d51ed | 536 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
537 | } |
538 | ||
b772e1dd JT |
539 | static void srcu_torture_synchronize(void) |
540 | { | |
ca1d51ed | 541 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
542 | } |
543 | ||
e3f8d378 | 544 | static void srcu_torture_call(struct rcu_head *head, |
b6a4ae76 | 545 | rcu_callback_t func) |
e3f8d378 | 546 | { |
ca1d51ed | 547 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
548 | } |
549 | ||
550 | static void srcu_torture_barrier(void) | |
551 | { | |
ca1d51ed | 552 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
553 | } |
554 | ||
eea203fe | 555 | static void srcu_torture_stats(void) |
b2896d2e | 556 | { |
b2896d2e | 557 | int cpu; |
ca1d51ed | 558 | int idx = srcu_ctlp->completed & 0x1; |
b2896d2e | 559 | |
eea203fe JP |
560 | pr_alert("%s%s per-CPU(idx=%d):", |
561 | torture_type, TORTURE_FLAG, idx); | |
b2896d2e | 562 | for_each_possible_cpu(cpu) { |
589a8f59 PM |
563 | long c0, c1; |
564 | ||
ca1d51ed PM |
565 | c0 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[!idx]; |
566 | c1 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[idx]; | |
eea203fe | 567 | pr_cont(" %d(%ld,%ld)", cpu, c0, c1); |
b2896d2e | 568 | } |
eea203fe | 569 | pr_cont("\n"); |
b2896d2e PM |
570 | } |
571 | ||
2ec1f2d9 PM |
572 | static void srcu_torture_synchronize_expedited(void) |
573 | { | |
ca1d51ed | 574 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
575 | } |
576 | ||
b2896d2e | 577 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 578 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 579 | .init = rcu_sync_torture_init, |
0acc512c PM |
580 | .readlock = srcu_torture_read_lock, |
581 | .read_delay = srcu_read_delay, | |
582 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 583 | .started = NULL, |
0acc512c | 584 | .completed = srcu_torture_completed, |
9059c940 | 585 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 586 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 587 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
588 | .call = srcu_torture_call, |
589 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
590 | .stats = srcu_torture_stats, |
591 | .name = "srcu" | |
b2896d2e PM |
592 | }; |
593 | ||
ca1d51ed PM |
594 | static void srcu_torture_init(void) |
595 | { | |
596 | rcu_sync_torture_init(); | |
597 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
598 | srcu_ctlp = &srcu_ctld; | |
599 | } | |
600 | ||
601 | static void srcu_torture_cleanup(void) | |
602 | { | |
603 | cleanup_srcu_struct(&srcu_ctld); | |
604 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ | |
605 | } | |
606 | ||
607 | /* As above, but dynamically allocated. */ | |
608 | static struct rcu_torture_ops srcud_ops = { | |
609 | .ttype = SRCU_FLAVOR, | |
610 | .init = srcu_torture_init, | |
611 | .cleanup = srcu_torture_cleanup, | |
612 | .readlock = srcu_torture_read_lock, | |
613 | .read_delay = srcu_read_delay, | |
614 | .readunlock = srcu_torture_read_unlock, | |
615 | .started = NULL, | |
616 | .completed = srcu_torture_completed, | |
617 | .deferred_free = srcu_torture_deferred_free, | |
618 | .sync = srcu_torture_synchronize, | |
619 | .exp_sync = srcu_torture_synchronize_expedited, | |
620 | .call = srcu_torture_call, | |
621 | .cb_barrier = srcu_torture_barrier, | |
622 | .stats = srcu_torture_stats, | |
623 | .name = "srcud" | |
624 | }; | |
625 | ||
4b6c2cca JT |
626 | /* |
627 | * Definitions for sched torture testing. | |
628 | */ | |
629 | ||
630 | static int sched_torture_read_lock(void) | |
631 | { | |
632 | preempt_disable(); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static void sched_torture_read_unlock(int idx) | |
637 | { | |
638 | preempt_enable(); | |
639 | } | |
640 | ||
2326974d PM |
641 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
642 | { | |
643 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
644 | } | |
645 | ||
4b6c2cca | 646 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 647 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 648 | .init = rcu_sync_torture_init, |
0acc512c PM |
649 | .readlock = sched_torture_read_lock, |
650 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
651 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 652 | .started = rcu_batches_started_sched, |
1e32eaee | 653 | .completed = rcu_batches_completed_sched, |
0acc512c | 654 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 655 | .sync = synchronize_sched, |
2ec1f2d9 | 656 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
657 | .get_state = get_state_synchronize_sched, |
658 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 659 | .call = call_rcu_sched, |
0acc512c | 660 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 661 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
662 | .stats = NULL, |
663 | .irq_capable = 1, | |
664 | .name = "sched" | |
4b6c2cca JT |
665 | }; |
666 | ||
69c60455 PM |
667 | #ifdef CONFIG_TASKS_RCU |
668 | ||
669 | /* | |
670 | * Definitions for RCU-tasks torture testing. | |
671 | */ | |
672 | ||
673 | static int tasks_torture_read_lock(void) | |
674 | { | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static void tasks_torture_read_unlock(int idx) | |
679 | { | |
680 | } | |
681 | ||
682 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
683 | { | |
684 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
685 | } | |
686 | ||
687 | static struct rcu_torture_ops tasks_ops = { | |
688 | .ttype = RCU_TASKS_FLAVOR, | |
689 | .init = rcu_sync_torture_init, | |
690 | .readlock = tasks_torture_read_lock, | |
691 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
692 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 693 | .started = rcu_no_completed, |
69c60455 PM |
694 | .completed = rcu_no_completed, |
695 | .deferred_free = rcu_tasks_torture_deferred_free, | |
696 | .sync = synchronize_rcu_tasks, | |
697 | .exp_sync = synchronize_rcu_tasks, | |
698 | .call = call_rcu_tasks, | |
699 | .cb_barrier = rcu_barrier_tasks, | |
700 | .fqs = NULL, | |
701 | .stats = NULL, | |
702 | .irq_capable = 1, | |
703 | .name = "tasks" | |
704 | }; | |
705 | ||
706 | #define RCUTORTURE_TASKS_OPS &tasks_ops, | |
707 | ||
5be5d1a1 PM |
708 | static bool __maybe_unused torturing_tasks(void) |
709 | { | |
710 | return cur_ops == &tasks_ops; | |
711 | } | |
712 | ||
69c60455 PM |
713 | #else /* #ifdef CONFIG_TASKS_RCU */ |
714 | ||
715 | #define RCUTORTURE_TASKS_OPS | |
716 | ||
4f441a25 | 717 | static bool __maybe_unused torturing_tasks(void) |
5be5d1a1 PM |
718 | { |
719 | return false; | |
720 | } | |
721 | ||
69c60455 PM |
722 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ |
723 | ||
8e8be45e PM |
724 | /* |
725 | * RCU torture priority-boost testing. Runs one real-time thread per | |
726 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
727 | * spinning waiting for them to be invoked. If a given callback takes | |
728 | * too long to be invoked, we assume that priority inversion has occurred. | |
729 | */ | |
730 | ||
731 | struct rcu_boost_inflight { | |
732 | struct rcu_head rcu; | |
733 | int inflight; | |
734 | }; | |
735 | ||
736 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
737 | { | |
738 | struct rcu_boost_inflight *rbip = | |
739 | container_of(head, struct rcu_boost_inflight, rcu); | |
740 | ||
6c7ed42c PM |
741 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
742 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
743 | } |
744 | ||
745 | static int rcu_torture_boost(void *arg) | |
746 | { | |
747 | unsigned long call_rcu_time; | |
748 | unsigned long endtime; | |
749 | unsigned long oldstarttime; | |
750 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
751 | struct sched_param sp; | |
752 | ||
5ccf60f2 | 753 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
754 | |
755 | /* Set real-time priority. */ | |
756 | sp.sched_priority = 1; | |
757 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 758 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
759 | n_rcu_torture_boost_rterror++; |
760 | } | |
761 | ||
561190e3 | 762 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
763 | /* Each pass through the following loop does one boost-test cycle. */ |
764 | do { | |
765 | /* Wait for the next test interval. */ | |
766 | oldstarttime = boost_starttime; | |
93898fb1 | 767 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 768 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 769 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 770 | if (torture_must_stop()) |
8e8be45e PM |
771 | goto checkwait; |
772 | } | |
773 | ||
774 | /* Do one boost-test interval. */ | |
775 | endtime = oldstarttime + test_boost_duration * HZ; | |
776 | call_rcu_time = jiffies; | |
93898fb1 | 777 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 778 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
779 | if (!smp_load_acquire(&rbi.inflight)) { |
780 | /* RCU core before ->inflight = 1. */ | |
781 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e PM |
782 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
783 | if (jiffies - call_rcu_time > | |
784 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 785 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
786 | n_rcu_torture_boost_failure++; |
787 | } | |
788 | call_rcu_time = jiffies; | |
789 | } | |
628edaa5 | 790 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 791 | if (torture_must_stop()) |
8e8be45e PM |
792 | goto checkwait; |
793 | } | |
794 | ||
795 | /* | |
796 | * Set the start time of the next test interval. | |
797 | * Yes, this is vulnerable to long delays, but such | |
798 | * delays simply cause a false negative for the next | |
799 | * interval. Besides, we are running at RT priority, | |
800 | * so delays should be relatively rare. | |
801 | */ | |
ab8f11e5 PM |
802 | while (oldstarttime == boost_starttime && |
803 | !kthread_should_stop()) { | |
8e8be45e PM |
804 | if (mutex_trylock(&boost_mutex)) { |
805 | boost_starttime = jiffies + | |
806 | test_boost_interval * HZ; | |
807 | n_rcu_torture_boosts++; | |
808 | mutex_unlock(&boost_mutex); | |
809 | break; | |
810 | } | |
811 | schedule_timeout_uninterruptible(1); | |
812 | } | |
813 | ||
814 | /* Go do the stutter. */ | |
628edaa5 | 815 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 816 | } while (!torture_must_stop()); |
8e8be45e PM |
817 | |
818 | /* Clean up and exit. */ | |
6c7ed42c | 819 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 820 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 821 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 822 | } |
9d68197c | 823 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 824 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
825 | return 0; |
826 | } | |
827 | ||
38706bc5 PM |
828 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
829 | { | |
830 | } | |
831 | ||
832 | /* | |
833 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
834 | * to call_rcu() or analogous, increasing the probability of occurrence | |
835 | * of callback-overflow corner cases. | |
836 | */ | |
837 | static int | |
838 | rcu_torture_cbflood(void *arg) | |
839 | { | |
840 | int err = 1; | |
841 | int i; | |
842 | int j; | |
843 | struct rcu_head *rhp; | |
844 | ||
845 | if (cbflood_n_per_burst > 0 && | |
846 | cbflood_inter_holdoff > 0 && | |
847 | cbflood_intra_holdoff > 0 && | |
848 | cur_ops->call && | |
849 | cur_ops->cb_barrier) { | |
850 | rhp = vmalloc(sizeof(*rhp) * | |
851 | cbflood_n_burst * cbflood_n_per_burst); | |
852 | err = !rhp; | |
853 | } | |
854 | if (err) { | |
855 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 856 | goto wait_for_stop; |
38706bc5 PM |
857 | } |
858 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
859 | do { | |
860 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
861 | atomic_long_inc(&n_cbfloods); | |
862 | WARN_ON(signal_pending(current)); | |
863 | for (i = 0; i < cbflood_n_burst; i++) { | |
864 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
865 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
866 | rcu_torture_cbflood_cb); | |
867 | } | |
868 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
869 | WARN_ON(signal_pending(current)); | |
870 | } | |
871 | cur_ops->cb_barrier(); | |
872 | stutter_wait("rcu_torture_cbflood"); | |
873 | } while (!torture_must_stop()); | |
b8969d1a | 874 | vfree(rhp); |
3a0af333 | 875 | wait_for_stop: |
38706bc5 PM |
876 | torture_kthread_stopping("rcu_torture_cbflood"); |
877 | return 0; | |
878 | } | |
879 | ||
bf66f18e PM |
880 | /* |
881 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
882 | * bursts of calls to force_quiescent_state(), increasing the probability | |
883 | * of occurrence of some important types of race conditions. | |
884 | */ | |
885 | static int | |
886 | rcu_torture_fqs(void *arg) | |
887 | { | |
888 | unsigned long fqs_resume_time; | |
889 | int fqs_burst_remaining; | |
890 | ||
5ccf60f2 | 891 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
892 | do { |
893 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
894 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
895 | !kthread_should_stop()) { | |
bf66f18e PM |
896 | schedule_timeout_interruptible(1); |
897 | } | |
898 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
899 | while (fqs_burst_remaining > 0 && |
900 | !kthread_should_stop()) { | |
bf66f18e PM |
901 | cur_ops->fqs(); |
902 | udelay(fqs_holdoff); | |
903 | fqs_burst_remaining -= fqs_holdoff; | |
904 | } | |
628edaa5 | 905 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 906 | } while (!torture_must_stop()); |
7fafaac5 | 907 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
908 | return 0; |
909 | } | |
910 | ||
a241ec65 PM |
911 | /* |
912 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
913 | * for that pointed to by rcu_torture_current, freeing the old structure | |
914 | * after a series of grace periods (the "pipeline"). | |
915 | */ | |
916 | static int | |
917 | rcu_torture_writer(void *arg) | |
918 | { | |
9efafb88 | 919 | bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal(); |
4bb3c5f4 | 920 | int expediting = 0; |
a48f3fad PM |
921 | unsigned long gp_snap; |
922 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 923 | bool gp_sync1 = gp_sync; |
a241ec65 | 924 | int i; |
a241ec65 PM |
925 | struct rcu_torture *rp; |
926 | struct rcu_torture *old_rp; | |
51b1130e | 927 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
928 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
929 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 930 | int nsynctypes = 0; |
a241ec65 | 931 | |
5ccf60f2 | 932 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
aa5a8988 PM |
933 | if (!can_expedite) { |
934 | pr_alert("%s" TORTURE_FLAG | |
9efafb88 | 935 | " GP expediting controlled from boot/sysfs for %s,\n", |
aa5a8988 PM |
936 | torture_type, cur_ops->name); |
937 | pr_alert("%s" TORTURE_FLAG | |
938 | " Disabled dynamic grace-period expediting.\n", | |
939 | torture_type); | |
940 | } | |
dbdf65b1 | 941 | |
a48f3fad | 942 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 943 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 944 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
a48f3fad PM |
945 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
946 | synctype[nsynctypes++] = RTWS_COND_GET; | |
947 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
948 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
949 | if (gp_exp1 && cur_ops->exp_sync) | |
950 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
951 | else if (gp_exp && !cur_ops->exp_sync) | |
952 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
953 | if (gp_normal1 && cur_ops->deferred_free) | |
954 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
955 | else if (gp_normal && !cur_ops->deferred_free) | |
956 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
957 | if (gp_sync1 && cur_ops->sync) |
958 | synctype[nsynctypes++] = RTWS_SYNC; | |
959 | else if (gp_sync && !cur_ops->sync) | |
960 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
961 | if (WARN_ONCE(nsynctypes == 0, |
962 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
963 | /* |
964 | * No updates primitives, so don't try updating. | |
965 | * The resulting test won't be testing much, hence the | |
966 | * above WARN_ONCE(). | |
967 | */ | |
a48f3fad PM |
968 | rcu_torture_writer_state = RTWS_STOPPING; |
969 | torture_kthread_stopping("rcu_torture_writer"); | |
970 | } | |
971 | ||
a241ec65 | 972 | do { |
ad0dc7f9 | 973 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 974 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
975 | rp = rcu_torture_alloc(); |
976 | if (rp == NULL) | |
a241ec65 PM |
977 | continue; |
978 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 979 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 980 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 981 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
982 | old_rp = rcu_dereference_check(rcu_torture_current, |
983 | current == writer_task); | |
996417d2 | 984 | rp->rtort_mbtest = 1; |
a241ec65 | 985 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 986 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 987 | if (old_rp) { |
a241ec65 PM |
988 | i = old_rp->rtort_pipe_count; |
989 | if (i > RCU_TORTURE_PIPE_LEN) | |
990 | i = RCU_TORTURE_PIPE_LEN; | |
991 | atomic_inc(&rcu_torture_wcount[i]); | |
992 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
993 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
994 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 995 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 996 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
997 | break; |
998 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 999 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 1000 | cur_ops->exp_sync(); |
a48f3fad PM |
1001 | rcu_torture_pipe_update(old_rp); |
1002 | break; | |
1003 | case RTWS_COND_GET: | |
1004 | rcu_torture_writer_state = RTWS_COND_GET; | |
1005 | gp_snap = cur_ops->get_state(); | |
1006 | i = torture_random(&rand) % 16; | |
1007 | if (i != 0) | |
1008 | schedule_timeout_interruptible(i); | |
1009 | udelay(torture_random(&rand) % 1000); | |
1010 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
1011 | cur_ops->cond_sync(gp_snap); | |
1012 | rcu_torture_pipe_update(old_rp); | |
1013 | break; | |
f0bf8fab PM |
1014 | case RTWS_SYNC: |
1015 | rcu_torture_writer_state = RTWS_SYNC; | |
1016 | cur_ops->sync(); | |
1017 | rcu_torture_pipe_update(old_rp); | |
1018 | break; | |
a48f3fad PM |
1019 | default: |
1020 | WARN_ON_ONCE(1); | |
1021 | break; | |
2ec1f2d9 | 1022 | } |
a241ec65 | 1023 | } |
4a298656 | 1024 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
1025 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1026 | if (can_expedite && | |
1027 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1028 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1029 | if (expediting >= 0) | |
1030 | rcu_expedite_gp(); | |
1031 | else | |
1032 | rcu_unexpedite_gp(); | |
1033 | if (++expediting > 3) | |
1034 | expediting = -expediting; | |
1035 | } | |
ad0dc7f9 | 1036 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1037 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1038 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1039 | /* Reset expediting back to unexpedited. */ |
1040 | if (expediting > 0) | |
1041 | expediting = -expediting; | |
1042 | while (can_expedite && expediting++ < 0) | |
1043 | rcu_unexpedite_gp(); | |
1044 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 1045 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1046 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1047 | return 0; |
1048 | } | |
1049 | ||
b772e1dd JT |
1050 | /* |
1051 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1052 | * delay between calls. | |
1053 | */ | |
1054 | static int | |
1055 | rcu_torture_fakewriter(void *arg) | |
1056 | { | |
51b1130e | 1057 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1058 | |
5ccf60f2 | 1059 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1060 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1061 | |
1062 | do { | |
51b1130e PM |
1063 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1064 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1065 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1066 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1067 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1068 | } else if (gp_normal == gp_exp) { |
51b1130e | 1069 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1070 | cur_ops->sync(); |
1071 | else | |
1072 | cur_ops->exp_sync(); | |
1073 | } else if (gp_normal) { | |
72472a02 | 1074 | cur_ops->sync(); |
2ec1f2d9 PM |
1075 | } else { |
1076 | cur_ops->exp_sync(); | |
1077 | } | |
628edaa5 | 1078 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1079 | } while (!torture_must_stop()); |
b772e1dd | 1080 | |
7fafaac5 | 1081 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1082 | return 0; |
1083 | } | |
1084 | ||
0729fbf3 PM |
1085 | /* |
1086 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1087 | * incrementing the corresponding element of the pipeline array. The | |
1088 | * counter in the element should never be greater than 1, otherwise, the | |
1089 | * RCU implementation is broken. | |
1090 | */ | |
1091 | static void rcu_torture_timer(unsigned long unused) | |
1092 | { | |
1093 | int idx; | |
917963d0 | 1094 | unsigned long started; |
6b80da42 | 1095 | unsigned long completed; |
51b1130e | 1096 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1097 | static DEFINE_SPINLOCK(rand_lock); |
1098 | struct rcu_torture *p; | |
1099 | int pipe_count; | |
52494535 | 1100 | unsigned long long ts; |
0729fbf3 PM |
1101 | |
1102 | idx = cur_ops->readlock(); | |
917963d0 PM |
1103 | if (cur_ops->started) |
1104 | started = cur_ops->started(); | |
1105 | else | |
1106 | started = cur_ops->completed(); | |
e4aa0da3 | 1107 | ts = rcu_trace_clock_local(); |
632ee200 | 1108 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1109 | rcu_read_lock_bh_held() || |
1110 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1111 | srcu_read_lock_held(srcu_ctlp) || |
1112 | torturing_tasks()); | |
0729fbf3 PM |
1113 | if (p == NULL) { |
1114 | /* Leave because rcu_torture_writer is not yet underway */ | |
1115 | cur_ops->readunlock(idx); | |
1116 | return; | |
1117 | } | |
1118 | if (p->rtort_mbtest == 0) | |
1119 | atomic_inc(&n_rcu_torture_mberror); | |
1120 | spin_lock(&rand_lock); | |
0acc512c | 1121 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1122 | n_rcu_torture_timers++; |
1123 | spin_unlock(&rand_lock); | |
1124 | preempt_disable(); | |
1125 | pipe_count = p->rtort_pipe_count; | |
1126 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1127 | /* Should not happen, but... */ | |
1128 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1129 | } | |
917963d0 | 1130 | completed = cur_ops->completed(); |
52494535 | 1131 | if (pipe_count > 1) { |
52494535 | 1132 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1133 | started, completed); |
274529ba | 1134 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1135 | } |
dd17c8f7 | 1136 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1137 | completed = completed - started; |
1138 | if (cur_ops->started) | |
1139 | completed++; | |
0729fbf3 PM |
1140 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1141 | /* Should not happen, but... */ | |
1142 | completed = RCU_TORTURE_PIPE_LEN; | |
1143 | } | |
dd17c8f7 | 1144 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1145 | preempt_enable(); |
1146 | cur_ops->readunlock(idx); | |
1147 | } | |
1148 | ||
a241ec65 PM |
1149 | /* |
1150 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1151 | * incrementing the corresponding element of the pipeline array. The | |
1152 | * counter in the element should never be greater than 1, otherwise, the | |
1153 | * RCU implementation is broken. | |
1154 | */ | |
1155 | static int | |
1156 | rcu_torture_reader(void *arg) | |
1157 | { | |
917963d0 | 1158 | unsigned long started; |
6b80da42 | 1159 | unsigned long completed; |
72e9bb54 | 1160 | int idx; |
51b1130e | 1161 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1162 | struct rcu_torture *p; |
1163 | int pipe_count; | |
0729fbf3 | 1164 | struct timer_list t; |
52494535 | 1165 | unsigned long long ts; |
a241ec65 | 1166 | |
5ccf60f2 | 1167 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1168 | set_user_nice(current, MAX_NICE); |
0acc512c | 1169 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1170 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1171 | |
a241ec65 | 1172 | do { |
0acc512c | 1173 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1174 | if (!timer_pending(&t)) |
6155fec9 | 1175 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1176 | } |
72e9bb54 | 1177 | idx = cur_ops->readlock(); |
917963d0 PM |
1178 | if (cur_ops->started) |
1179 | started = cur_ops->started(); | |
1180 | else | |
1181 | started = cur_ops->completed(); | |
e4aa0da3 | 1182 | ts = rcu_trace_clock_local(); |
632ee200 | 1183 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1184 | rcu_read_lock_bh_held() || |
1185 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1186 | srcu_read_lock_held(srcu_ctlp) || |
1187 | torturing_tasks()); | |
a241ec65 PM |
1188 | if (p == NULL) { |
1189 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1190 | cur_ops->readunlock(idx); |
a241ec65 PM |
1191 | schedule_timeout_interruptible(HZ); |
1192 | continue; | |
1193 | } | |
996417d2 PM |
1194 | if (p->rtort_mbtest == 0) |
1195 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1196 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1197 | preempt_disable(); |
1198 | pipe_count = p->rtort_pipe_count; | |
1199 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1200 | /* Should not happen, but... */ | |
1201 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1202 | } | |
917963d0 | 1203 | completed = cur_ops->completed(); |
52494535 | 1204 | if (pipe_count > 1) { |
52494535 | 1205 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1206 | ts, started, completed); |
274529ba | 1207 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1208 | } |
dd17c8f7 | 1209 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1210 | completed = completed - started; |
1211 | if (cur_ops->started) | |
1212 | completed++; | |
a241ec65 PM |
1213 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1214 | /* Should not happen, but... */ | |
1215 | completed = RCU_TORTURE_PIPE_LEN; | |
1216 | } | |
dd17c8f7 | 1217 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1218 | preempt_enable(); |
72e9bb54 | 1219 | cur_ops->readunlock(idx); |
628edaa5 | 1220 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1221 | } while (!torture_must_stop()); |
424c1b68 | 1222 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1223 | del_timer_sync(&t); |
424c1b68 TG |
1224 | destroy_timer_on_stack(&t); |
1225 | } | |
7fafaac5 | 1226 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1227 | return 0; |
1228 | } | |
1229 | ||
1230 | /* | |
eea203fe JP |
1231 | * Print torture statistics. Caller must ensure that there is only |
1232 | * one call to this function at a given time!!! This is normally | |
1233 | * accomplished by relying on the module system to only have one copy | |
1234 | * of the module loaded, and then by giving the rcu_torture_stats | |
1235 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1236 | * thread is not running). | |
a241ec65 | 1237 | */ |
d1008950 | 1238 | static void |
eea203fe | 1239 | rcu_torture_stats_print(void) |
a241ec65 | 1240 | { |
a241ec65 PM |
1241 | int cpu; |
1242 | int i; | |
1243 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1244 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1245 | static unsigned long rtcv_snap = ULONG_MAX; |
a241ec65 | 1246 | |
0a945022 | 1247 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1248 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1249 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1250 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1251 | } | |
1252 | } | |
1253 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1254 | if (pipesummary[i] != 0) | |
1255 | break; | |
1256 | } | |
eea203fe JP |
1257 | |
1258 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1259 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1260 | rcu_torture_current, | |
1261 | rcu_torture_current_version, | |
1262 | list_empty(&rcu_torture_freelist), | |
1263 | atomic_read(&n_rcu_torture_alloc), | |
1264 | atomic_read(&n_rcu_torture_alloc_fail), | |
1265 | atomic_read(&n_rcu_torture_free)); | |
1266 | pr_cont("rtmbe: %d rtbke: %ld rtbre: %ld ", | |
1267 | atomic_read(&n_rcu_torture_mberror), | |
1268 | n_rcu_torture_boost_ktrerror, | |
1269 | n_rcu_torture_boost_rterror); | |
1270 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1271 | n_rcu_torture_boost_failure, | |
1272 | n_rcu_torture_boosts, | |
1273 | n_rcu_torture_timers); | |
1274 | torture_onoff_stats(); | |
38706bc5 | 1275 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1276 | n_barrier_successes, |
1277 | n_barrier_attempts, | |
1278 | n_rcu_torture_barrier_error); | |
38706bc5 | 1279 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1280 | |
1281 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1282 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1283 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1284 | n_rcu_torture_boost_ktrerror != 0 || |
1285 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1286 | n_rcu_torture_boost_failure != 0 || |
1287 | i > 1) { | |
eea203fe | 1288 | pr_cont("%s", "!!! "); |
996417d2 | 1289 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1290 | WARN_ON_ONCE(1); |
996417d2 | 1291 | } |
eea203fe | 1292 | pr_cont("Reader Pipe: "); |
a241ec65 | 1293 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1294 | pr_cont(" %ld", pipesummary[i]); |
1295 | pr_cont("\n"); | |
1296 | ||
1297 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1298 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1299 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1300 | pr_cont(" %ld", batchsummary[i]); |
1301 | pr_cont("\n"); | |
1302 | ||
1303 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1304 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1305 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1306 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1307 | } |
eea203fe JP |
1308 | pr_cont("\n"); |
1309 | ||
c8e5b163 | 1310 | if (cur_ops->stats) |
eea203fe | 1311 | cur_ops->stats(); |
ad0dc7f9 PM |
1312 | if (rtcv_snap == rcu_torture_current_version && |
1313 | rcu_torture_current != NULL) { | |
1314 | int __maybe_unused flags; | |
1315 | unsigned long __maybe_unused gpnum; | |
1316 | unsigned long __maybe_unused completed; | |
1317 | ||
1318 | rcutorture_get_gp_data(cur_ops->ttype, | |
1319 | &flags, &gpnum, &completed); | |
18aff33e PM |
1320 | pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x\n", |
1321 | rcu_torture_writer_state_getname(), | |
eea203fe JP |
1322 | rcu_torture_writer_state, |
1323 | gpnum, completed, flags); | |
afea227f | 1324 | show_rcu_gp_kthreads(); |
274529ba | 1325 | rcu_ftrace_dump(DUMP_ALL); |
ad0dc7f9 PM |
1326 | } |
1327 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1328 | } |
1329 | ||
a241ec65 PM |
1330 | /* |
1331 | * Periodically prints torture statistics, if periodic statistics printing | |
1332 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1333 | */ |
1334 | static int | |
1335 | rcu_torture_stats(void *arg) | |
1336 | { | |
5ccf60f2 | 1337 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1338 | do { |
1339 | schedule_timeout_interruptible(stat_interval * HZ); | |
1340 | rcu_torture_stats_print(); | |
f67a3356 | 1341 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1342 | } while (!torture_must_stop()); |
7fafaac5 | 1343 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1344 | return 0; |
1345 | } | |
1346 | ||
95c38322 | 1347 | static inline void |
e66c33d5 | 1348 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1349 | { |
2caa1e44 PM |
1350 | pr_alert("%s" TORTURE_FLAG |
1351 | "--- %s: nreaders=%d nfakewriters=%d " | |
1352 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1353 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1354 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1355 | "test_boost=%d/%d test_boost_interval=%d " | |
1356 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1357 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1358 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1359 | "onoff_interval=%d onoff_holdoff=%d\n", |
1360 | torture_type, tag, nrealreaders, nfakewriters, | |
1361 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1362 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1363 | test_boost, cur_ops->can_boost, | |
1364 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1365 | stall_cpu, stall_cpu_holdoff, |
1366 | n_barrier_cbs, | |
2caa1e44 | 1367 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1368 | } |
1369 | ||
8e8be45e PM |
1370 | static void rcutorture_booster_cleanup(int cpu) |
1371 | { | |
1372 | struct task_struct *t; | |
1373 | ||
1374 | if (boost_tasks[cpu] == NULL) | |
1375 | return; | |
1376 | mutex_lock(&boost_mutex); | |
8e8be45e PM |
1377 | t = boost_tasks[cpu]; |
1378 | boost_tasks[cpu] = NULL; | |
1379 | mutex_unlock(&boost_mutex); | |
1380 | ||
1381 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1382 | torture_stop_kthread(rcu_torture_boost, t); |
8e8be45e PM |
1383 | } |
1384 | ||
1385 | static int rcutorture_booster_init(int cpu) | |
1386 | { | |
1387 | int retval; | |
1388 | ||
1389 | if (boost_tasks[cpu] != NULL) | |
1390 | return 0; /* Already created, nothing more to do. */ | |
1391 | ||
1392 | /* Don't allow time recalculation while creating a new task. */ | |
1393 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1394 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1395 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1396 | cpu_to_node(cpu), | |
1397 | "rcu_torture_boost"); | |
8e8be45e PM |
1398 | if (IS_ERR(boost_tasks[cpu])) { |
1399 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1400 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1401 | n_rcu_torture_boost_ktrerror++; |
1402 | boost_tasks[cpu] = NULL; | |
1403 | mutex_unlock(&boost_mutex); | |
1404 | return retval; | |
1405 | } | |
1406 | kthread_bind(boost_tasks[cpu], cpu); | |
1407 | wake_up_process(boost_tasks[cpu]); | |
1408 | mutex_unlock(&boost_mutex); | |
1409 | return 0; | |
1410 | } | |
1411 | ||
c13f3757 PM |
1412 | /* |
1413 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1414 | * induces a CPU stall for the time specified by stall_cpu. | |
1415 | */ | |
49fb4c62 | 1416 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1417 | { |
1418 | unsigned long stop_at; | |
1419 | ||
5ccf60f2 | 1420 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1421 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1422 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1423 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1424 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1425 | } |
1426 | if (!kthread_should_stop()) { | |
1427 | stop_at = get_seconds() + stall_cpu; | |
1428 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1429 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1430 | rcu_read_lock(); |
1431 | preempt_disable(); | |
1432 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1433 | continue; /* Induce RCU CPU stall warning. */ | |
1434 | preempt_enable(); | |
1435 | rcu_read_unlock(); | |
2caa1e44 | 1436 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1437 | } |
f67a3356 | 1438 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1439 | while (!kthread_should_stop()) |
1440 | schedule_timeout_interruptible(10 * HZ); | |
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1445 | static int __init rcu_torture_stall_init(void) | |
1446 | { | |
c13f3757 PM |
1447 | if (stall_cpu <= 0) |
1448 | return 0; | |
47cf29b9 | 1449 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1450 | } |
1451 | ||
fae4b54f | 1452 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1453 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1454 | { |
1455 | atomic_inc(&barrier_cbs_invoked); | |
1456 | } | |
1457 | ||
1458 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1459 | static int rcu_torture_barrier_cbs(void *arg) | |
1460 | { | |
1461 | long myid = (long)arg; | |
c6ebcbb6 | 1462 | bool lastphase = 0; |
78e4bc34 | 1463 | bool newphase; |
fae4b54f PM |
1464 | struct rcu_head rcu; |
1465 | ||
1466 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1467 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1468 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1469 | do { |
1470 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1471 | (newphase = |
6c7ed42c | 1472 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1473 | torture_must_stop()); |
78e4bc34 | 1474 | lastphase = newphase; |
36970bb9 | 1475 | if (torture_must_stop()) |
fae4b54f | 1476 | break; |
6c7ed42c PM |
1477 | /* |
1478 | * The above smp_load_acquire() ensures barrier_phase load | |
1479 | * is ordered before the folloiwng ->call(). | |
1480 | */ | |
0aa67e75 | 1481 | local_irq_disable(); /* Just to test no-irq call_rcu(). */ |
fae4b54f | 1482 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
0aa67e75 | 1483 | local_irq_enable(); |
fae4b54f PM |
1484 | if (atomic_dec_and_test(&barrier_cbs_count)) |
1485 | wake_up(&barrier_wq); | |
36970bb9 | 1486 | } while (!torture_must_stop()); |
69c60455 PM |
1487 | if (cur_ops->cb_barrier != NULL) |
1488 | cur_ops->cb_barrier(); | |
fae4b54f | 1489 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1490 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1491 | return 0; |
1492 | } | |
1493 | ||
1494 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1495 | static int rcu_torture_barrier(void *arg) | |
1496 | { | |
1497 | int i; | |
1498 | ||
5ccf60f2 | 1499 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1500 | do { |
1501 | atomic_set(&barrier_cbs_invoked, 0); | |
1502 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1503 | /* Ensure barrier_phase ordered after prior assignments. */ |
1504 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1505 | for (i = 0; i < n_barrier_cbs; i++) |
1506 | wake_up(&barrier_cbs_wq[i]); | |
1507 | wait_event(barrier_wq, | |
1508 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1509 | torture_must_stop()); |
1510 | if (torture_must_stop()) | |
fae4b54f PM |
1511 | break; |
1512 | n_barrier_attempts++; | |
78e4bc34 | 1513 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1514 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1515 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1516 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1517 | atomic_read(&barrier_cbs_invoked), | |
1518 | n_barrier_cbs); | |
fae4b54f PM |
1519 | WARN_ON_ONCE(1); |
1520 | } | |
1521 | n_barrier_successes++; | |
1522 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1523 | } while (!torture_must_stop()); |
7fafaac5 | 1524 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1525 | return 0; |
1526 | } | |
1527 | ||
1528 | /* Initialize RCU barrier testing. */ | |
1529 | static int rcu_torture_barrier_init(void) | |
1530 | { | |
1531 | int i; | |
1532 | int ret; | |
1533 | ||
d9eba768 | 1534 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1535 | return 0; |
1536 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1537 | pr_alert("%s" TORTURE_FLAG |
1538 | " Call or barrier ops missing for %s,\n", | |
1539 | torture_type, cur_ops->name); | |
1540 | pr_alert("%s" TORTURE_FLAG | |
1541 | " RCU barrier testing omitted from run.\n", | |
1542 | torture_type); | |
fae4b54f PM |
1543 | return 0; |
1544 | } | |
1545 | atomic_set(&barrier_cbs_count, 0); | |
1546 | atomic_set(&barrier_cbs_invoked, 0); | |
1547 | barrier_cbs_tasks = | |
1548 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1549 | GFP_KERNEL); | |
1550 | barrier_cbs_wq = | |
1551 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1552 | GFP_KERNEL); | |
de5e6437 | 1553 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1554 | return -ENOMEM; |
1555 | for (i = 0; i < n_barrier_cbs; i++) { | |
1556 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1557 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1558 | (void *)(long)i, | |
1559 | barrier_cbs_tasks[i]); | |
1560 | if (ret) | |
fae4b54f | 1561 | return ret; |
fae4b54f | 1562 | } |
47cf29b9 | 1563 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1564 | } |
1565 | ||
1566 | /* Clean up after RCU barrier testing. */ | |
1567 | static void rcu_torture_barrier_cleanup(void) | |
1568 | { | |
1569 | int i; | |
1570 | ||
9c029b86 | 1571 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1572 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1573 | for (i = 0; i < n_barrier_cbs; i++) |
1574 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1575 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1576 | kfree(barrier_cbs_tasks); |
1577 | barrier_cbs_tasks = NULL; | |
1578 | } | |
1579 | if (barrier_cbs_wq != NULL) { | |
1580 | kfree(barrier_cbs_wq); | |
1581 | barrier_cbs_wq = NULL; | |
1582 | } | |
1583 | } | |
1584 | ||
8e8be45e PM |
1585 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1586 | unsigned long action, void *hcpu) | |
1587 | { | |
1588 | long cpu = (long)hcpu; | |
1589 | ||
de26ca19 | 1590 | switch (action & ~CPU_TASKS_FROZEN) { |
8e8be45e PM |
1591 | case CPU_ONLINE: |
1592 | case CPU_DOWN_FAILED: | |
1593 | (void)rcutorture_booster_init(cpu); | |
1594 | break; | |
1595 | case CPU_DOWN_PREPARE: | |
1596 | rcutorture_booster_cleanup(cpu); | |
1597 | break; | |
1598 | default: | |
1599 | break; | |
1600 | } | |
1601 | return NOTIFY_OK; | |
1602 | } | |
1603 | ||
1604 | static struct notifier_block rcutorture_cpu_nb = { | |
1605 | .notifier_call = rcutorture_cpu_notify, | |
1606 | }; | |
1607 | ||
a241ec65 PM |
1608 | static void |
1609 | rcu_torture_cleanup(void) | |
1610 | { | |
1611 | int i; | |
1612 | ||
4a298656 | 1613 | rcutorture_record_test_transition(); |
d36a7a0d | 1614 | if (torture_cleanup_begin()) { |
343e9099 PM |
1615 | if (cur_ops->cb_barrier != NULL) |
1616 | cur_ops->cb_barrier(); | |
1617 | return; | |
1618 | } | |
d84f5203 | 1619 | |
fae4b54f | 1620 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1621 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1622 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1623 | |
c8e5b163 | 1624 | if (reader_tasks) { |
9c029b86 PM |
1625 | for (i = 0; i < nrealreaders; i++) |
1626 | torture_stop_kthread(rcu_torture_reader, | |
1627 | reader_tasks[i]); | |
a241ec65 | 1628 | kfree(reader_tasks); |
a241ec65 PM |
1629 | } |
1630 | rcu_torture_current = NULL; | |
1631 | ||
c8e5b163 | 1632 | if (fakewriter_tasks) { |
b772e1dd | 1633 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1634 | torture_stop_kthread(rcu_torture_fakewriter, |
1635 | fakewriter_tasks[i]); | |
b772e1dd JT |
1636 | } |
1637 | kfree(fakewriter_tasks); | |
1638 | fakewriter_tasks = NULL; | |
1639 | } | |
1640 | ||
9c029b86 PM |
1641 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1642 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1643 | for (i = 0; i < ncbflooders; i++) |
1644 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e PM |
1645 | if ((test_boost == 1 && cur_ops->can_boost) || |
1646 | test_boost == 2) { | |
1647 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1648 | for_each_possible_cpu(i) | |
1649 | rcutorture_booster_cleanup(i); | |
1650 | } | |
bf66f18e | 1651 | |
ca1d51ed PM |
1652 | /* |
1653 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1654 | * cleanup operations. | |
1655 | */ | |
2326974d PM |
1656 | if (cur_ops->cb_barrier != NULL) |
1657 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
1658 | if (cur_ops->cleanup != NULL) |
1659 | cur_ops->cleanup(); | |
a241ec65 | 1660 | |
a241ec65 | 1661 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1662 | |
fae4b54f | 1663 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1664 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1665 | else if (torture_onoff_failures()) |
091541bb PM |
1666 | rcu_torture_print_module_parms(cur_ops, |
1667 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1668 | else |
8e8be45e | 1669 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1670 | torture_cleanup_end(); |
a241ec65 PM |
1671 | } |
1672 | ||
d2818df1 PM |
1673 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1674 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1675 | { | |
1676 | } | |
1677 | ||
1678 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1679 | { | |
1680 | /* | |
1681 | * This -might- happen due to race conditions, but is unlikely. | |
1682 | * The scenario that leads to this happening is that the | |
1683 | * first of the pair of duplicate callbacks is queued, | |
1684 | * someone else starts a grace period that includes that | |
1685 | * callback, then the second of the pair must wait for the | |
1686 | * next grace period. Unlikely, but can happen. If it | |
1687 | * does happen, the debug-objects subsystem won't have splatted. | |
1688 | */ | |
1689 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1690 | } | |
1691 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1692 | ||
1693 | /* | |
1694 | * Verify that double-free causes debug-objects to complain, but only | |
1695 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1696 | * cannot be carried out. | |
1697 | */ | |
1698 | static void rcu_test_debug_objects(void) | |
1699 | { | |
1700 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1701 | struct rcu_head rh1; | |
1702 | struct rcu_head rh2; | |
1703 | ||
1704 | init_rcu_head_on_stack(&rh1); | |
1705 | init_rcu_head_on_stack(&rh2); | |
1706 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1707 | ||
1708 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1709 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1710 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1711 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1712 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1713 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1714 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1715 | local_irq_enable(); | |
1716 | rcu_read_unlock(); | |
1717 | preempt_enable(); | |
1718 | ||
1719 | /* Wait for them all to get done so we can safely return. */ | |
1720 | rcu_barrier(); | |
1721 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1722 | destroy_rcu_head_on_stack(&rh1); | |
1723 | destroy_rcu_head_on_stack(&rh2); | |
1724 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1725 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1726 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1727 | } | |
1728 | ||
6f8bc500 | 1729 | static int __init |
a241ec65 PM |
1730 | rcu_torture_init(void) |
1731 | { | |
1732 | int i; | |
1733 | int cpu; | |
1734 | int firsterr = 0; | |
2ec1f2d9 | 1735 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed PM |
1736 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
1737 | &sched_ops, RCUTORTURE_TASKS_OPS | |
2ec1f2d9 | 1738 | }; |
a241ec65 | 1739 | |
59da22a0 | 1740 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1741 | return -EBUSY; |
343e9099 | 1742 | |
a241ec65 | 1743 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1744 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1745 | cur_ops = torture_ops[i]; |
ade5fb81 | 1746 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1747 | break; |
72e9bb54 | 1748 | } |
ade5fb81 | 1749 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1750 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1751 | torture_type); | |
1752 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1753 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1754 | pr_alert(" %s", torture_ops[i]->name); |
1755 | pr_alert("\n"); | |
889d487a PM |
1756 | firsterr = -EINVAL; |
1757 | goto unwind; | |
72e9bb54 | 1758 | } |
bf66f18e | 1759 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1760 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1761 | fqs_duration = 0; |
1762 | } | |
c8e5b163 | 1763 | if (cur_ops->init) |
889d487a | 1764 | cur_ops->init(); |
72e9bb54 | 1765 | |
64e4b43a | 1766 | if (nreaders >= 0) { |
a241ec65 | 1767 | nrealreaders = nreaders; |
64e4b43a | 1768 | } else { |
3838cc18 | 1769 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
1770 | if (nrealreaders <= 0) |
1771 | nrealreaders = 1; | |
1772 | } | |
8e8be45e | 1773 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1774 | |
1775 | /* Set up the freelist. */ | |
1776 | ||
1777 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1778 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1779 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1780 | list_add_tail(&rcu_tortures[i].rtort_free, |
1781 | &rcu_torture_freelist); | |
1782 | } | |
1783 | ||
1784 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1785 | ||
1786 | rcu_torture_current = NULL; | |
1787 | rcu_torture_current_version = 0; | |
1788 | atomic_set(&n_rcu_torture_alloc, 0); | |
1789 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1790 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1791 | atomic_set(&n_rcu_torture_mberror, 0); |
1792 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1793 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1794 | n_rcu_torture_boost_ktrerror = 0; |
1795 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1796 | n_rcu_torture_boost_failure = 0; |
1797 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1798 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1799 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1800 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1801 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1802 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1803 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | /* Start up the kthreads. */ | |
1808 | ||
47cf29b9 PM |
1809 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1810 | writer_task); | |
1811 | if (firsterr) | |
a241ec65 | 1812 | goto unwind; |
4444d852 PM |
1813 | if (nfakewriters > 0) { |
1814 | fakewriter_tasks = kzalloc(nfakewriters * | |
1815 | sizeof(fakewriter_tasks[0]), | |
1816 | GFP_KERNEL); | |
1817 | if (fakewriter_tasks == NULL) { | |
1818 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1819 | firsterr = -ENOMEM; | |
1820 | goto unwind; | |
1821 | } | |
b772e1dd JT |
1822 | } |
1823 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1824 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1825 | NULL, fakewriter_tasks[i]); | |
1826 | if (firsterr) | |
b772e1dd | 1827 | goto unwind; |
b772e1dd | 1828 | } |
2860aaba | 1829 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1830 | GFP_KERNEL); |
1831 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1832 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1833 | firsterr = -ENOMEM; |
1834 | goto unwind; | |
1835 | } | |
1836 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1837 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1838 | reader_tasks[i]); | |
1839 | if (firsterr) | |
a241ec65 | 1840 | goto unwind; |
a241ec65 PM |
1841 | } |
1842 | if (stat_interval > 0) { | |
47cf29b9 PM |
1843 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1844 | stats_task); | |
1845 | if (firsterr) | |
a241ec65 | 1846 | goto unwind; |
a241ec65 | 1847 | } |
e8e255f7 | 1848 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
1849 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1850 | if (firsterr) | |
d84f5203 | 1851 | goto unwind; |
d84f5203 | 1852 | } |
d120f65f PM |
1853 | if (stutter < 0) |
1854 | stutter = 0; | |
1855 | if (stutter) { | |
628edaa5 PM |
1856 | firsterr = torture_stutter_init(stutter * HZ); |
1857 | if (firsterr) | |
d120f65f | 1858 | goto unwind; |
d120f65f | 1859 | } |
bf66f18e PM |
1860 | if (fqs_duration < 0) |
1861 | fqs_duration = 0; | |
1862 | if (fqs_duration) { | |
628edaa5 | 1863 | /* Create the fqs thread */ |
d0d0606e PM |
1864 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1865 | fqs_task); | |
47cf29b9 | 1866 | if (firsterr) |
bf66f18e | 1867 | goto unwind; |
bf66f18e | 1868 | } |
8e8be45e PM |
1869 | if (test_boost_interval < 1) |
1870 | test_boost_interval = 1; | |
1871 | if (test_boost_duration < 2) | |
1872 | test_boost_duration = 2; | |
1873 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1874 | test_boost == 2) { | |
8e8be45e PM |
1875 | |
1876 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1877 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1878 | for_each_possible_cpu(i) { | |
1879 | if (cpu_is_offline(i)) | |
1880 | continue; /* Heuristic: CPU can go offline. */ | |
01025ebc PM |
1881 | firsterr = rcutorture_booster_init(i); |
1882 | if (firsterr) | |
8e8be45e | 1883 | goto unwind; |
8e8be45e PM |
1884 | } |
1885 | } | |
01025ebc PM |
1886 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1887 | if (firsterr) | |
37e377d2 | 1888 | goto unwind; |
01025ebc PM |
1889 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1890 | if (firsterr) | |
37e377d2 | 1891 | goto unwind; |
01025ebc PM |
1892 | firsterr = rcu_torture_stall_init(); |
1893 | if (firsterr) | |
37e377d2 | 1894 | goto unwind; |
01025ebc PM |
1895 | firsterr = rcu_torture_barrier_init(); |
1896 | if (firsterr) | |
fae4b54f | 1897 | goto unwind; |
d2818df1 PM |
1898 | if (object_debug) |
1899 | rcu_test_debug_objects(); | |
38706bc5 PM |
1900 | if (cbflood_n_burst > 0) { |
1901 | /* Create the cbflood threads */ | |
1902 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1903 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1904 | GFP_KERNEL); | |
1905 | if (!cbflood_task) { | |
1906 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1907 | firsterr = -ENOMEM; | |
1908 | goto unwind; | |
1909 | } | |
1910 | for (i = 0; i < ncbflooders; i++) { | |
1911 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1912 | NULL, | |
1913 | cbflood_task[i]); | |
1914 | if (firsterr) | |
1915 | goto unwind; | |
1916 | } | |
1917 | } | |
4a298656 | 1918 | rcutorture_record_test_transition(); |
b5daa8f3 | 1919 | torture_init_end(); |
a241ec65 PM |
1920 | return 0; |
1921 | ||
1922 | unwind: | |
b5daa8f3 | 1923 | torture_init_end(); |
a241ec65 PM |
1924 | rcu_torture_cleanup(); |
1925 | return firsterr; | |
1926 | } | |
1927 | ||
1928 | module_init(rcu_torture_init); | |
1929 | module_exit(rcu_torture_cleanup); |