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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> | |
174cd4b1 | 35 | #include <linux/sched/signal.h> |
ae7e81c0 | 36 | #include <uapi/linux/sched/types.h> |
60063497 | 37 | #include <linux/atomic.h> |
a241ec65 | 38 | #include <linux/bitops.h> |
a241ec65 PM |
39 | #include <linux/completion.h> |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/percpu.h> | |
42 | #include <linux/notifier.h> | |
343e9099 | 43 | #include <linux/reboot.h> |
83144186 | 44 | #include <linux/freezer.h> |
a241ec65 | 45 | #include <linux/cpu.h> |
a241ec65 | 46 | #include <linux/delay.h> |
a241ec65 | 47 | #include <linux/stat.h> |
b2896d2e | 48 | #include <linux/srcu.h> |
1aeb272c | 49 | #include <linux/slab.h> |
52494535 | 50 | #include <linux/trace_clock.h> |
f07767fd | 51 | #include <asm/byteorder.h> |
51b1130e | 52 | #include <linux/torture.h> |
38706bc5 | 53 | #include <linux/vmalloc.h> |
a241ec65 | 54 | |
25c36329 PM |
55 | #include "rcu.h" |
56 | ||
a241ec65 | 57 | MODULE_LICENSE("GPL"); |
e0198b29 | 58 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@joshtriplett.org>"); |
a241ec65 | 59 | |
4102adab | 60 | |
38706bc5 PM |
61 | torture_param(int, cbflood_inter_holdoff, HZ, |
62 | "Holdoff between floods (jiffies)"); | |
63 | torture_param(int, cbflood_intra_holdoff, 1, | |
64 | "Holdoff between bursts (jiffies)"); | |
65 | torture_param(int, cbflood_n_burst, 3, "# bursts in flood, zero to disable"); | |
66 | torture_param(int, cbflood_n_per_burst, 20000, | |
67 | "# callbacks per burst in flood"); | |
9e250225 PM |
68 | torture_param(int, fqs_duration, 0, |
69 | "Duration of fqs bursts (us), 0 to disable"); | |
70 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
71 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
a48f3fad | 72 | torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives"); |
9e250225 PM |
73 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); |
74 | torture_param(bool, gp_normal, false, | |
75 | "Use normal (non-expedited) GP wait primitives"); | |
f0bf8fab | 76 | torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives"); |
9e250225 PM |
77 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); |
78 | torture_param(int, n_barrier_cbs, 0, | |
79 | "# of callbacks/kthreads for barrier testing"); | |
80 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
81 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
82 | torture_param(int, object_debug, 0, | |
83 | "Enable debug-object double call_rcu() testing"); | |
84 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
85 | torture_param(int, onoff_interval, 0, | |
86 | "Time between CPU hotplugs (s), 0=disable"); | |
87 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); | |
88 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
89 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
90 | torture_param(int, stall_cpu_holdoff, 10, | |
91 | "Time to wait before starting stall (s)."); | |
92 | torture_param(int, stat_interval, 60, | |
93 | "Number of seconds between stats printk()s"); | |
94 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
95 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
96 | torture_param(int, test_boost_duration, 4, | |
97 | "Duration of each boost test, seconds."); | |
98 | torture_param(int, test_boost_interval, 7, | |
99 | "Interval between boost tests, seconds."); | |
100 | torture_param(bool, test_no_idle_hz, true, | |
101 | "Test support for tickless idle CPUs"); | |
b5daa8f3 PM |
102 | torture_param(bool, verbose, true, |
103 | "Enable verbose debugging printk()s"); | |
9e250225 | 104 | |
d10453e9 | 105 | static char *torture_type = "rcu"; |
d6ad6711 | 106 | module_param(torture_type, charp, 0444); |
d10453e9 | 107 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
a241ec65 | 108 | |
a241ec65 | 109 | static int nrealreaders; |
38706bc5 | 110 | static int ncbflooders; |
a241ec65 | 111 | static struct task_struct *writer_task; |
b772e1dd | 112 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
113 | static struct task_struct **reader_tasks; |
114 | static struct task_struct *stats_task; | |
38706bc5 | 115 | static struct task_struct **cbflood_task; |
bf66f18e | 116 | static struct task_struct *fqs_task; |
8e8be45e | 117 | static struct task_struct *boost_tasks[NR_CPUS]; |
c13f3757 | 118 | static struct task_struct *stall_task; |
fae4b54f PM |
119 | static struct task_struct **barrier_cbs_tasks; |
120 | static struct task_struct *barrier_task; | |
a241ec65 PM |
121 | |
122 | #define RCU_TORTURE_PIPE_LEN 10 | |
123 | ||
124 | struct rcu_torture { | |
125 | struct rcu_head rtort_rcu; | |
126 | int rtort_pipe_count; | |
127 | struct list_head rtort_free; | |
996417d2 | 128 | int rtort_mbtest; |
a241ec65 PM |
129 | }; |
130 | ||
a241ec65 | 131 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 132 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 133 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
134 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
135 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
67522bee PM |
136 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count); |
137 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch); | |
a241ec65 | 138 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
139 | static atomic_t n_rcu_torture_alloc; |
140 | static atomic_t n_rcu_torture_alloc_fail; | |
141 | static atomic_t n_rcu_torture_free; | |
142 | static atomic_t n_rcu_torture_mberror; | |
143 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 144 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
145 | static long n_rcu_torture_boost_ktrerror; |
146 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
147 | static long n_rcu_torture_boost_failure; |
148 | static long n_rcu_torture_boosts; | |
a71fca58 | 149 | static long n_rcu_torture_timers; |
fae4b54f PM |
150 | static long n_barrier_attempts; |
151 | static long n_barrier_successes; | |
38706bc5 | 152 | static atomic_long_t n_cbfloods; |
e3033736 | 153 | static struct list_head rcu_torture_removed; |
d120f65f | 154 | |
ad0dc7f9 PM |
155 | static int rcu_torture_writer_state; |
156 | #define RTWS_FIXED_DELAY 0 | |
157 | #define RTWS_DELAY 1 | |
158 | #define RTWS_REPLACE 2 | |
159 | #define RTWS_DEF_FREE 3 | |
160 | #define RTWS_EXP_SYNC 4 | |
a48f3fad PM |
161 | #define RTWS_COND_GET 5 |
162 | #define RTWS_COND_SYNC 6 | |
f0bf8fab PM |
163 | #define RTWS_SYNC 7 |
164 | #define RTWS_STUTTER 8 | |
165 | #define RTWS_STOPPING 9 | |
18aff33e PM |
166 | static const char * const rcu_torture_writer_state_names[] = { |
167 | "RTWS_FIXED_DELAY", | |
168 | "RTWS_DELAY", | |
169 | "RTWS_REPLACE", | |
170 | "RTWS_DEF_FREE", | |
171 | "RTWS_EXP_SYNC", | |
172 | "RTWS_COND_GET", | |
173 | "RTWS_COND_SYNC", | |
174 | "RTWS_SYNC", | |
175 | "RTWS_STUTTER", | |
176 | "RTWS_STOPPING", | |
177 | }; | |
178 | ||
179 | static const char *rcu_torture_writer_state_getname(void) | |
180 | { | |
181 | unsigned int i = READ_ONCE(rcu_torture_writer_state); | |
182 | ||
183 | if (i >= ARRAY_SIZE(rcu_torture_writer_state_names)) | |
184 | return "???"; | |
185 | return rcu_torture_writer_state_names[i]; | |
186 | } | |
ad0dc7f9 | 187 | |
4e9a073f | 188 | static int torture_runnable = IS_ENABLED(MODULE); |
59da22a0 PM |
189 | module_param(torture_runnable, int, 0444); |
190 | MODULE_PARM_DESC(torture_runnable, "Start rcutorture at boot"); | |
31a72bce | 191 | |
3acf4a9a | 192 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 193 | #define rcu_can_boost() 1 |
3acf4a9a | 194 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 195 | #define rcu_can_boost() 0 |
3acf4a9a | 196 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 197 | |
e4aa0da3 SR |
198 | #ifdef CONFIG_RCU_TRACE |
199 | static u64 notrace rcu_trace_clock_local(void) | |
200 | { | |
201 | u64 ts = trace_clock_local(); | |
a3b7b6c2 PM |
202 | |
203 | (void)do_div(ts, NSEC_PER_USEC); | |
e4aa0da3 SR |
204 | return ts; |
205 | } | |
206 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
207 | static u64 notrace rcu_trace_clock_local(void) | |
208 | { | |
209 | return 0ULL; | |
210 | } | |
211 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
212 | ||
8e8be45e | 213 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 214 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 215 | /* and boost task create/destroy. */ |
fae4b54f | 216 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 217 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
218 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
219 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
220 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 221 | |
a241ec65 PM |
222 | /* |
223 | * Allocate an element from the rcu_tortures pool. | |
224 | */ | |
97a41e26 | 225 | static struct rcu_torture * |
a241ec65 PM |
226 | rcu_torture_alloc(void) |
227 | { | |
228 | struct list_head *p; | |
229 | ||
adac1665 | 230 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
231 | if (list_empty(&rcu_torture_freelist)) { |
232 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 233 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
234 | return NULL; |
235 | } | |
236 | atomic_inc(&n_rcu_torture_alloc); | |
237 | p = rcu_torture_freelist.next; | |
238 | list_del_init(p); | |
adac1665 | 239 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
240 | return container_of(p, struct rcu_torture, rtort_free); |
241 | } | |
242 | ||
243 | /* | |
244 | * Free an element to the rcu_tortures pool. | |
245 | */ | |
246 | static void | |
247 | rcu_torture_free(struct rcu_torture *p) | |
248 | { | |
249 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 250 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 251 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 252 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
253 | } |
254 | ||
72e9bb54 PM |
255 | /* |
256 | * Operations vector for selecting different types of tests. | |
257 | */ | |
258 | ||
259 | struct rcu_torture_ops { | |
ad0dc7f9 | 260 | int ttype; |
72e9bb54 | 261 | void (*init)(void); |
ca1d51ed | 262 | void (*cleanup)(void); |
72e9bb54 | 263 | int (*readlock)(void); |
51b1130e | 264 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 265 | void (*readunlock)(int idx); |
917963d0 | 266 | unsigned long (*started)(void); |
6b80da42 | 267 | unsigned long (*completed)(void); |
0acc512c | 268 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 269 | void (*sync)(void); |
2ec1f2d9 | 270 | void (*exp_sync)(void); |
a48f3fad PM |
271 | unsigned long (*get_state)(void); |
272 | void (*cond_sync)(unsigned long oldstate); | |
db3e8db4 | 273 | call_rcu_func_t call; |
2326974d | 274 | void (*cb_barrier)(void); |
bf66f18e | 275 | void (*fqs)(void); |
eea203fe | 276 | void (*stats)(void); |
0acc512c | 277 | int irq_capable; |
8e8be45e | 278 | int can_boost; |
e66c33d5 | 279 | const char *name; |
72e9bb54 | 280 | }; |
a71fca58 PM |
281 | |
282 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
283 | |
284 | /* | |
285 | * Definitions for rcu torture testing. | |
286 | */ | |
287 | ||
a49a4af7 | 288 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
289 | { |
290 | rcu_read_lock(); | |
291 | return 0; | |
292 | } | |
293 | ||
51b1130e | 294 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 295 | { |
d0af39e8 PM |
296 | unsigned long started; |
297 | unsigned long completed; | |
b8d57a76 JT |
298 | const unsigned long shortdelay_us = 200; |
299 | const unsigned long longdelay_ms = 50; | |
d0af39e8 | 300 | unsigned long long ts; |
b2896d2e | 301 | |
b8d57a76 JT |
302 | /* We want a short delay sometimes to make a reader delay the grace |
303 | * period, and we want a long delay occasionally to trigger | |
304 | * force_quiescent_state. */ | |
b2896d2e | 305 | |
d0af39e8 PM |
306 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) { |
307 | started = cur_ops->completed(); | |
308 | ts = rcu_trace_clock_local(); | |
b8d57a76 | 309 | mdelay(longdelay_ms); |
d0af39e8 PM |
310 | completed = cur_ops->completed(); |
311 | do_trace_rcu_torture_read(cur_ops->name, NULL, ts, | |
312 | started, completed); | |
313 | } | |
51b1130e | 314 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 315 | udelay(shortdelay_us); |
e546f485 | 316 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
317 | if (!preempt_count() && |
318 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
319 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
320 | #endif | |
b2896d2e PM |
321 | } |
322 | ||
a49a4af7 | 323 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
324 | { |
325 | rcu_read_unlock(); | |
326 | } | |
327 | ||
a48f3fad PM |
328 | /* |
329 | * Update callback in the pipe. This should be invoked after a grace period. | |
330 | */ | |
331 | static bool | |
332 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
333 | { | |
334 | int i; | |
335 | ||
336 | i = rp->rtort_pipe_count; | |
337 | if (i > RCU_TORTURE_PIPE_LEN) | |
338 | i = RCU_TORTURE_PIPE_LEN; | |
339 | atomic_inc(&rcu_torture_wcount[i]); | |
340 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
341 | rp->rtort_mbtest = 0; | |
342 | return true; | |
343 | } | |
344 | return false; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
349 | * primitives. | |
350 | */ | |
351 | static void | |
352 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
353 | { | |
354 | struct rcu_torture *rp; | |
355 | struct rcu_torture *rp1; | |
356 | ||
357 | if (old_rp) | |
358 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
359 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
360 | if (rcu_torture_pipe_update_one(rp)) { | |
361 | list_del(&rp->rtort_free); | |
362 | rcu_torture_free(rp); | |
363 | } | |
364 | } | |
365 | } | |
366 | ||
72e9bb54 PM |
367 | static void |
368 | rcu_torture_cb(struct rcu_head *p) | |
369 | { | |
72e9bb54 PM |
370 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
371 | ||
36970bb9 | 372 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
373 | /* Test is ending, just drop callbacks on the floor. */ |
374 | /* The next initialization will pick up the pieces. */ | |
375 | return; | |
376 | } | |
a48f3fad | 377 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 378 | rcu_torture_free(rp); |
a48f3fad | 379 | else |
0acc512c | 380 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
381 | } |
382 | ||
6b80da42 | 383 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
384 | { |
385 | return 0; | |
386 | } | |
387 | ||
72e9bb54 PM |
388 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
389 | { | |
390 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
391 | } | |
392 | ||
e3033736 JT |
393 | static void rcu_sync_torture_init(void) |
394 | { | |
395 | INIT_LIST_HEAD(&rcu_torture_removed); | |
396 | } | |
397 | ||
2ec1f2d9 | 398 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 399 | .ttype = RCU_FLAVOR, |
0acc512c | 400 | .init = rcu_sync_torture_init, |
0acc512c PM |
401 | .readlock = rcu_torture_read_lock, |
402 | .read_delay = rcu_read_delay, | |
403 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 404 | .started = rcu_batches_started, |
1e32eaee | 405 | .completed = rcu_batches_completed, |
2ec1f2d9 | 406 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 407 | .sync = synchronize_rcu, |
2ec1f2d9 | 408 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
409 | .get_state = get_state_synchronize_rcu, |
410 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
411 | .call = call_rcu, |
412 | .cb_barrier = rcu_barrier, | |
bf66f18e | 413 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
414 | .stats = NULL, |
415 | .irq_capable = 1, | |
8e8be45e | 416 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 417 | .name = "rcu" |
d9a3da06 PM |
418 | }; |
419 | ||
c32e0660 PM |
420 | /* |
421 | * Definitions for rcu_bh torture testing. | |
422 | */ | |
423 | ||
a49a4af7 | 424 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
425 | { |
426 | rcu_read_lock_bh(); | |
427 | return 0; | |
428 | } | |
429 | ||
a49a4af7 | 430 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
431 | { |
432 | rcu_read_unlock_bh(); | |
433 | } | |
434 | ||
c32e0660 PM |
435 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
436 | { | |
437 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
438 | } | |
439 | ||
440 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 441 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 442 | .init = rcu_sync_torture_init, |
0acc512c PM |
443 | .readlock = rcu_bh_torture_read_lock, |
444 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
445 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 446 | .started = rcu_batches_started_bh, |
1e32eaee | 447 | .completed = rcu_batches_completed_bh, |
0acc512c | 448 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 449 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 450 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 451 | .call = call_rcu_bh, |
0acc512c | 452 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 453 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
454 | .stats = NULL, |
455 | .irq_capable = 1, | |
456 | .name = "rcu_bh" | |
c32e0660 PM |
457 | }; |
458 | ||
ff20e251 PM |
459 | /* |
460 | * Don't even think about trying any of these in real life!!! | |
461 | * The names includes "busted", and they really means it! | |
462 | * The only purpose of these functions is to provide a buggy RCU | |
463 | * implementation to make sure that rcutorture correctly emits | |
464 | * buggy-RCU error messages. | |
465 | */ | |
466 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
467 | { | |
468 | /* This is a deliberate bug for testing purposes only! */ | |
469 | rcu_torture_cb(&p->rtort_rcu); | |
470 | } | |
471 | ||
472 | static void synchronize_rcu_busted(void) | |
473 | { | |
474 | /* This is a deliberate bug for testing purposes only! */ | |
475 | } | |
476 | ||
477 | static void | |
b6a4ae76 | 478 | call_rcu_busted(struct rcu_head *head, rcu_callback_t func) |
ff20e251 PM |
479 | { |
480 | /* This is a deliberate bug for testing purposes only! */ | |
481 | func(head); | |
482 | } | |
483 | ||
484 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 485 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
486 | .init = rcu_sync_torture_init, |
487 | .readlock = rcu_torture_read_lock, | |
488 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
489 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 490 | .started = rcu_no_completed, |
ff20e251 PM |
491 | .completed = rcu_no_completed, |
492 | .deferred_free = rcu_busted_torture_deferred_free, | |
493 | .sync = synchronize_rcu_busted, | |
494 | .exp_sync = synchronize_rcu_busted, | |
495 | .call = call_rcu_busted, | |
496 | .cb_barrier = NULL, | |
497 | .fqs = NULL, | |
498 | .stats = NULL, | |
499 | .irq_capable = 1, | |
b3c98314 | 500 | .name = "busted" |
ff20e251 PM |
501 | }; |
502 | ||
b2896d2e PM |
503 | /* |
504 | * Definitions for srcu torture testing. | |
505 | */ | |
506 | ||
cda4dc81 | 507 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
508 | static struct srcu_struct srcu_ctld; |
509 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 510 | |
ca1d51ed | 511 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 512 | { |
ca1d51ed | 513 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
514 | } |
515 | ||
51b1130e | 516 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
517 | { |
518 | long delay; | |
519 | const long uspertick = 1000000 / HZ; | |
520 | const long longdelay = 10; | |
521 | ||
522 | /* We want there to be long-running readers, but not all the time. */ | |
523 | ||
51b1130e PM |
524 | delay = torture_random(rrsp) % |
525 | (nrealreaders * 2 * longdelay * uspertick); | |
5e741fa9 | 526 | if (!delay && in_task()) |
b2896d2e | 527 | schedule_timeout_interruptible(longdelay); |
e546f485 LJ |
528 | else |
529 | rcu_read_delay(rrsp); | |
b2896d2e PM |
530 | } |
531 | ||
ca1d51ed | 532 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 533 | { |
ca1d51ed | 534 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
535 | } |
536 | ||
6b80da42 | 537 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 538 | { |
ca1d51ed | 539 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
540 | } |
541 | ||
9059c940 LJ |
542 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
543 | { | |
ca1d51ed | 544 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
545 | } |
546 | ||
b772e1dd JT |
547 | static void srcu_torture_synchronize(void) |
548 | { | |
ca1d51ed | 549 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
550 | } |
551 | ||
e3f8d378 | 552 | static void srcu_torture_call(struct rcu_head *head, |
b6a4ae76 | 553 | rcu_callback_t func) |
e3f8d378 | 554 | { |
ca1d51ed | 555 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
556 | } |
557 | ||
558 | static void srcu_torture_barrier(void) | |
559 | { | |
ca1d51ed | 560 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
561 | } |
562 | ||
eea203fe | 563 | static void srcu_torture_stats(void) |
b2896d2e | 564 | { |
115a1a52 | 565 | srcu_torture_stats_print(srcu_ctlp, torture_type, TORTURE_FLAG); |
b2896d2e PM |
566 | } |
567 | ||
2ec1f2d9 PM |
568 | static void srcu_torture_synchronize_expedited(void) |
569 | { | |
ca1d51ed | 570 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
571 | } |
572 | ||
b2896d2e | 573 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 574 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 575 | .init = rcu_sync_torture_init, |
0acc512c PM |
576 | .readlock = srcu_torture_read_lock, |
577 | .read_delay = srcu_read_delay, | |
578 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 579 | .started = NULL, |
0acc512c | 580 | .completed = srcu_torture_completed, |
9059c940 | 581 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 582 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 583 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
584 | .call = srcu_torture_call, |
585 | .cb_barrier = srcu_torture_barrier, | |
0acc512c | 586 | .stats = srcu_torture_stats, |
5e741fa9 | 587 | .irq_capable = 1, |
0acc512c | 588 | .name = "srcu" |
b2896d2e PM |
589 | }; |
590 | ||
ca1d51ed PM |
591 | static void srcu_torture_init(void) |
592 | { | |
593 | rcu_sync_torture_init(); | |
594 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
595 | srcu_ctlp = &srcu_ctld; | |
596 | } | |
597 | ||
598 | static void srcu_torture_cleanup(void) | |
599 | { | |
600 | cleanup_srcu_struct(&srcu_ctld); | |
601 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ | |
602 | } | |
603 | ||
604 | /* As above, but dynamically allocated. */ | |
605 | static struct rcu_torture_ops srcud_ops = { | |
606 | .ttype = SRCU_FLAVOR, | |
607 | .init = srcu_torture_init, | |
608 | .cleanup = srcu_torture_cleanup, | |
609 | .readlock = srcu_torture_read_lock, | |
610 | .read_delay = srcu_read_delay, | |
611 | .readunlock = srcu_torture_read_unlock, | |
612 | .started = NULL, | |
613 | .completed = srcu_torture_completed, | |
614 | .deferred_free = srcu_torture_deferred_free, | |
615 | .sync = srcu_torture_synchronize, | |
616 | .exp_sync = srcu_torture_synchronize_expedited, | |
617 | .call = srcu_torture_call, | |
618 | .cb_barrier = srcu_torture_barrier, | |
619 | .stats = srcu_torture_stats, | |
5e741fa9 | 620 | .irq_capable = 1, |
ca1d51ed PM |
621 | .name = "srcud" |
622 | }; | |
623 | ||
4b6c2cca JT |
624 | /* |
625 | * Definitions for sched torture testing. | |
626 | */ | |
627 | ||
628 | static int sched_torture_read_lock(void) | |
629 | { | |
630 | preempt_disable(); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static void sched_torture_read_unlock(int idx) | |
635 | { | |
636 | preempt_enable(); | |
637 | } | |
638 | ||
2326974d PM |
639 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
640 | { | |
641 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
642 | } | |
643 | ||
4b6c2cca | 644 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 645 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 646 | .init = rcu_sync_torture_init, |
0acc512c PM |
647 | .readlock = sched_torture_read_lock, |
648 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
649 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 650 | .started = rcu_batches_started_sched, |
1e32eaee | 651 | .completed = rcu_batches_completed_sched, |
0acc512c | 652 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 653 | .sync = synchronize_sched, |
2ec1f2d9 | 654 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
655 | .get_state = get_state_synchronize_sched, |
656 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 657 | .call = call_rcu_sched, |
0acc512c | 658 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 659 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
660 | .stats = NULL, |
661 | .irq_capable = 1, | |
662 | .name = "sched" | |
4b6c2cca JT |
663 | }; |
664 | ||
69c60455 PM |
665 | /* |
666 | * Definitions for RCU-tasks torture testing. | |
667 | */ | |
668 | ||
669 | static int tasks_torture_read_lock(void) | |
670 | { | |
671 | return 0; | |
672 | } | |
673 | ||
674 | static void tasks_torture_read_unlock(int idx) | |
675 | { | |
676 | } | |
677 | ||
678 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
679 | { | |
680 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
681 | } | |
682 | ||
683 | static struct rcu_torture_ops tasks_ops = { | |
684 | .ttype = RCU_TASKS_FLAVOR, | |
685 | .init = rcu_sync_torture_init, | |
686 | .readlock = tasks_torture_read_lock, | |
687 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
688 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 689 | .started = rcu_no_completed, |
69c60455 PM |
690 | .completed = rcu_no_completed, |
691 | .deferred_free = rcu_tasks_torture_deferred_free, | |
692 | .sync = synchronize_rcu_tasks, | |
693 | .exp_sync = synchronize_rcu_tasks, | |
694 | .call = call_rcu_tasks, | |
695 | .cb_barrier = rcu_barrier_tasks, | |
696 | .fqs = NULL, | |
697 | .stats = NULL, | |
698 | .irq_capable = 1, | |
699 | .name = "tasks" | |
700 | }; | |
701 | ||
5be5d1a1 PM |
702 | static bool __maybe_unused torturing_tasks(void) |
703 | { | |
704 | return cur_ops == &tasks_ops; | |
705 | } | |
706 | ||
8e8be45e PM |
707 | /* |
708 | * RCU torture priority-boost testing. Runs one real-time thread per | |
709 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
710 | * spinning waiting for them to be invoked. If a given callback takes | |
711 | * too long to be invoked, we assume that priority inversion has occurred. | |
712 | */ | |
713 | ||
714 | struct rcu_boost_inflight { | |
715 | struct rcu_head rcu; | |
716 | int inflight; | |
717 | }; | |
718 | ||
719 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
720 | { | |
721 | struct rcu_boost_inflight *rbip = | |
722 | container_of(head, struct rcu_boost_inflight, rcu); | |
723 | ||
6c7ed42c PM |
724 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
725 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
726 | } |
727 | ||
728 | static int rcu_torture_boost(void *arg) | |
729 | { | |
730 | unsigned long call_rcu_time; | |
731 | unsigned long endtime; | |
732 | unsigned long oldstarttime; | |
733 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
734 | struct sched_param sp; | |
735 | ||
5ccf60f2 | 736 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
737 | |
738 | /* Set real-time priority. */ | |
739 | sp.sched_priority = 1; | |
740 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 741 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
742 | n_rcu_torture_boost_rterror++; |
743 | } | |
744 | ||
561190e3 | 745 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
746 | /* Each pass through the following loop does one boost-test cycle. */ |
747 | do { | |
748 | /* Wait for the next test interval. */ | |
749 | oldstarttime = boost_starttime; | |
93898fb1 | 750 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 751 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 752 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 753 | if (torture_must_stop()) |
8e8be45e PM |
754 | goto checkwait; |
755 | } | |
756 | ||
757 | /* Do one boost-test interval. */ | |
758 | endtime = oldstarttime + test_boost_duration * HZ; | |
759 | call_rcu_time = jiffies; | |
93898fb1 | 760 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 761 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
762 | if (!smp_load_acquire(&rbi.inflight)) { |
763 | /* RCU core before ->inflight = 1. */ | |
764 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e PM |
765 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
766 | if (jiffies - call_rcu_time > | |
767 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 768 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
769 | n_rcu_torture_boost_failure++; |
770 | } | |
771 | call_rcu_time = jiffies; | |
772 | } | |
628edaa5 | 773 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 774 | if (torture_must_stop()) |
8e8be45e PM |
775 | goto checkwait; |
776 | } | |
777 | ||
778 | /* | |
779 | * Set the start time of the next test interval. | |
780 | * Yes, this is vulnerable to long delays, but such | |
781 | * delays simply cause a false negative for the next | |
782 | * interval. Besides, we are running at RT priority, | |
783 | * so delays should be relatively rare. | |
784 | */ | |
ab8f11e5 PM |
785 | while (oldstarttime == boost_starttime && |
786 | !kthread_should_stop()) { | |
8e8be45e PM |
787 | if (mutex_trylock(&boost_mutex)) { |
788 | boost_starttime = jiffies + | |
789 | test_boost_interval * HZ; | |
790 | n_rcu_torture_boosts++; | |
791 | mutex_unlock(&boost_mutex); | |
792 | break; | |
793 | } | |
794 | schedule_timeout_uninterruptible(1); | |
795 | } | |
796 | ||
797 | /* Go do the stutter. */ | |
628edaa5 | 798 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 799 | } while (!torture_must_stop()); |
8e8be45e PM |
800 | |
801 | /* Clean up and exit. */ | |
6c7ed42c | 802 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 803 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 804 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 805 | } |
9d68197c | 806 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 807 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
808 | return 0; |
809 | } | |
810 | ||
38706bc5 PM |
811 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
812 | { | |
813 | } | |
814 | ||
815 | /* | |
816 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
817 | * to call_rcu() or analogous, increasing the probability of occurrence | |
818 | * of callback-overflow corner cases. | |
819 | */ | |
820 | static int | |
821 | rcu_torture_cbflood(void *arg) | |
822 | { | |
823 | int err = 1; | |
824 | int i; | |
825 | int j; | |
826 | struct rcu_head *rhp; | |
827 | ||
828 | if (cbflood_n_per_burst > 0 && | |
829 | cbflood_inter_holdoff > 0 && | |
830 | cbflood_intra_holdoff > 0 && | |
831 | cur_ops->call && | |
832 | cur_ops->cb_barrier) { | |
833 | rhp = vmalloc(sizeof(*rhp) * | |
834 | cbflood_n_burst * cbflood_n_per_burst); | |
835 | err = !rhp; | |
836 | } | |
837 | if (err) { | |
838 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 839 | goto wait_for_stop; |
38706bc5 PM |
840 | } |
841 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
842 | do { | |
843 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
844 | atomic_long_inc(&n_cbfloods); | |
845 | WARN_ON(signal_pending(current)); | |
846 | for (i = 0; i < cbflood_n_burst; i++) { | |
847 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
848 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
849 | rcu_torture_cbflood_cb); | |
850 | } | |
851 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
852 | WARN_ON(signal_pending(current)); | |
853 | } | |
854 | cur_ops->cb_barrier(); | |
855 | stutter_wait("rcu_torture_cbflood"); | |
856 | } while (!torture_must_stop()); | |
b8969d1a | 857 | vfree(rhp); |
3a0af333 | 858 | wait_for_stop: |
38706bc5 PM |
859 | torture_kthread_stopping("rcu_torture_cbflood"); |
860 | return 0; | |
861 | } | |
862 | ||
bf66f18e PM |
863 | /* |
864 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
865 | * bursts of calls to force_quiescent_state(), increasing the probability | |
866 | * of occurrence of some important types of race conditions. | |
867 | */ | |
868 | static int | |
869 | rcu_torture_fqs(void *arg) | |
870 | { | |
871 | unsigned long fqs_resume_time; | |
872 | int fqs_burst_remaining; | |
873 | ||
5ccf60f2 | 874 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
875 | do { |
876 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
877 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
878 | !kthread_should_stop()) { | |
bf66f18e PM |
879 | schedule_timeout_interruptible(1); |
880 | } | |
881 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
882 | while (fqs_burst_remaining > 0 && |
883 | !kthread_should_stop()) { | |
bf66f18e PM |
884 | cur_ops->fqs(); |
885 | udelay(fqs_holdoff); | |
886 | fqs_burst_remaining -= fqs_holdoff; | |
887 | } | |
628edaa5 | 888 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 889 | } while (!torture_must_stop()); |
7fafaac5 | 890 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
891 | return 0; |
892 | } | |
893 | ||
a241ec65 PM |
894 | /* |
895 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
896 | * for that pointed to by rcu_torture_current, freeing the old structure | |
897 | * after a series of grace periods (the "pipeline"). | |
898 | */ | |
899 | static int | |
900 | rcu_torture_writer(void *arg) | |
901 | { | |
9efafb88 | 902 | bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal(); |
4bb3c5f4 | 903 | int expediting = 0; |
a48f3fad PM |
904 | unsigned long gp_snap; |
905 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 906 | bool gp_sync1 = gp_sync; |
a241ec65 | 907 | int i; |
a241ec65 PM |
908 | struct rcu_torture *rp; |
909 | struct rcu_torture *old_rp; | |
51b1130e | 910 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
911 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
912 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 913 | int nsynctypes = 0; |
a241ec65 | 914 | |
5ccf60f2 | 915 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
aa5a8988 PM |
916 | if (!can_expedite) { |
917 | pr_alert("%s" TORTURE_FLAG | |
9efafb88 | 918 | " GP expediting controlled from boot/sysfs for %s,\n", |
aa5a8988 PM |
919 | torture_type, cur_ops->name); |
920 | pr_alert("%s" TORTURE_FLAG | |
921 | " Disabled dynamic grace-period expediting.\n", | |
922 | torture_type); | |
923 | } | |
dbdf65b1 | 924 | |
a48f3fad | 925 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 926 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 927 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
a48f3fad PM |
928 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
929 | synctype[nsynctypes++] = RTWS_COND_GET; | |
930 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
931 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
932 | if (gp_exp1 && cur_ops->exp_sync) | |
933 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
934 | else if (gp_exp && !cur_ops->exp_sync) | |
935 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
936 | if (gp_normal1 && cur_ops->deferred_free) | |
937 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
938 | else if (gp_normal && !cur_ops->deferred_free) | |
939 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
940 | if (gp_sync1 && cur_ops->sync) |
941 | synctype[nsynctypes++] = RTWS_SYNC; | |
942 | else if (gp_sync && !cur_ops->sync) | |
943 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
944 | if (WARN_ONCE(nsynctypes == 0, |
945 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
946 | /* |
947 | * No updates primitives, so don't try updating. | |
948 | * The resulting test won't be testing much, hence the | |
949 | * above WARN_ONCE(). | |
950 | */ | |
a48f3fad PM |
951 | rcu_torture_writer_state = RTWS_STOPPING; |
952 | torture_kthread_stopping("rcu_torture_writer"); | |
953 | } | |
954 | ||
a241ec65 | 955 | do { |
ad0dc7f9 | 956 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 957 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
958 | rp = rcu_torture_alloc(); |
959 | if (rp == NULL) | |
a241ec65 PM |
960 | continue; |
961 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 962 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 963 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 964 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
965 | old_rp = rcu_dereference_check(rcu_torture_current, |
966 | current == writer_task); | |
996417d2 | 967 | rp->rtort_mbtest = 1; |
a241ec65 | 968 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 969 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 970 | if (old_rp) { |
a241ec65 PM |
971 | i = old_rp->rtort_pipe_count; |
972 | if (i > RCU_TORTURE_PIPE_LEN) | |
973 | i = RCU_TORTURE_PIPE_LEN; | |
974 | atomic_inc(&rcu_torture_wcount[i]); | |
975 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
976 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
977 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 978 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 979 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
980 | break; |
981 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 982 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 983 | cur_ops->exp_sync(); |
a48f3fad PM |
984 | rcu_torture_pipe_update(old_rp); |
985 | break; | |
986 | case RTWS_COND_GET: | |
987 | rcu_torture_writer_state = RTWS_COND_GET; | |
988 | gp_snap = cur_ops->get_state(); | |
989 | i = torture_random(&rand) % 16; | |
990 | if (i != 0) | |
991 | schedule_timeout_interruptible(i); | |
992 | udelay(torture_random(&rand) % 1000); | |
993 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
994 | cur_ops->cond_sync(gp_snap); | |
995 | rcu_torture_pipe_update(old_rp); | |
996 | break; | |
f0bf8fab PM |
997 | case RTWS_SYNC: |
998 | rcu_torture_writer_state = RTWS_SYNC; | |
999 | cur_ops->sync(); | |
1000 | rcu_torture_pipe_update(old_rp); | |
1001 | break; | |
a48f3fad PM |
1002 | default: |
1003 | WARN_ON_ONCE(1); | |
1004 | break; | |
2ec1f2d9 | 1005 | } |
a241ec65 | 1006 | } |
4a298656 | 1007 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
1008 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1009 | if (can_expedite && | |
1010 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1011 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1012 | if (expediting >= 0) | |
1013 | rcu_expedite_gp(); | |
1014 | else | |
1015 | rcu_unexpedite_gp(); | |
1016 | if (++expediting > 3) | |
1017 | expediting = -expediting; | |
1018 | } | |
ad0dc7f9 | 1019 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1020 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1021 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1022 | /* Reset expediting back to unexpedited. */ |
1023 | if (expediting > 0) | |
1024 | expediting = -expediting; | |
1025 | while (can_expedite && expediting++ < 0) | |
1026 | rcu_unexpedite_gp(); | |
1027 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 1028 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1029 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1030 | return 0; |
1031 | } | |
1032 | ||
b772e1dd JT |
1033 | /* |
1034 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1035 | * delay between calls. | |
1036 | */ | |
1037 | static int | |
1038 | rcu_torture_fakewriter(void *arg) | |
1039 | { | |
51b1130e | 1040 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1041 | |
5ccf60f2 | 1042 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1043 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1044 | |
1045 | do { | |
51b1130e PM |
1046 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1047 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1048 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1049 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1050 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1051 | } else if (gp_normal == gp_exp) { |
51b1130e | 1052 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1053 | cur_ops->sync(); |
1054 | else | |
1055 | cur_ops->exp_sync(); | |
1056 | } else if (gp_normal) { | |
72472a02 | 1057 | cur_ops->sync(); |
2ec1f2d9 PM |
1058 | } else { |
1059 | cur_ops->exp_sync(); | |
1060 | } | |
628edaa5 | 1061 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1062 | } while (!torture_must_stop()); |
b772e1dd | 1063 | |
7fafaac5 | 1064 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1065 | return 0; |
1066 | } | |
1067 | ||
f34c8585 PM |
1068 | static void rcu_torture_timer_cb(struct rcu_head *rhp) |
1069 | { | |
1070 | kfree(rhp); | |
1071 | } | |
1072 | ||
0729fbf3 PM |
1073 | /* |
1074 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1075 | * incrementing the corresponding element of the pipeline array. The | |
1076 | * counter in the element should never be greater than 1, otherwise, the | |
1077 | * RCU implementation is broken. | |
1078 | */ | |
1079 | static void rcu_torture_timer(unsigned long unused) | |
1080 | { | |
1081 | int idx; | |
917963d0 | 1082 | unsigned long started; |
6b80da42 | 1083 | unsigned long completed; |
51b1130e | 1084 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1085 | static DEFINE_SPINLOCK(rand_lock); |
1086 | struct rcu_torture *p; | |
1087 | int pipe_count; | |
52494535 | 1088 | unsigned long long ts; |
0729fbf3 PM |
1089 | |
1090 | idx = cur_ops->readlock(); | |
917963d0 PM |
1091 | if (cur_ops->started) |
1092 | started = cur_ops->started(); | |
1093 | else | |
1094 | started = cur_ops->completed(); | |
e4aa0da3 | 1095 | ts = rcu_trace_clock_local(); |
632ee200 | 1096 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1097 | rcu_read_lock_bh_held() || |
1098 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1099 | srcu_read_lock_held(srcu_ctlp) || |
1100 | torturing_tasks()); | |
0729fbf3 PM |
1101 | if (p == NULL) { |
1102 | /* Leave because rcu_torture_writer is not yet underway */ | |
1103 | cur_ops->readunlock(idx); | |
1104 | return; | |
1105 | } | |
1106 | if (p->rtort_mbtest == 0) | |
1107 | atomic_inc(&n_rcu_torture_mberror); | |
1108 | spin_lock(&rand_lock); | |
0acc512c | 1109 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1110 | n_rcu_torture_timers++; |
1111 | spin_unlock(&rand_lock); | |
1112 | preempt_disable(); | |
1113 | pipe_count = p->rtort_pipe_count; | |
1114 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1115 | /* Should not happen, but... */ | |
1116 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1117 | } | |
917963d0 | 1118 | completed = cur_ops->completed(); |
52494535 | 1119 | if (pipe_count > 1) { |
52494535 | 1120 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1121 | started, completed); |
274529ba | 1122 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1123 | } |
dd17c8f7 | 1124 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1125 | completed = completed - started; |
1126 | if (cur_ops->started) | |
1127 | completed++; | |
0729fbf3 PM |
1128 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1129 | /* Should not happen, but... */ | |
1130 | completed = RCU_TORTURE_PIPE_LEN; | |
1131 | } | |
dd17c8f7 | 1132 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1133 | preempt_enable(); |
1134 | cur_ops->readunlock(idx); | |
f34c8585 PM |
1135 | |
1136 | /* Test call_rcu() invocation from interrupt handler. */ | |
1137 | if (cur_ops->call) { | |
1138 | struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_NOWAIT); | |
1139 | ||
1140 | if (rhp) | |
1141 | cur_ops->call(rhp, rcu_torture_timer_cb); | |
1142 | } | |
0729fbf3 PM |
1143 | } |
1144 | ||
a241ec65 PM |
1145 | /* |
1146 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1147 | * incrementing the corresponding element of the pipeline array. The | |
1148 | * counter in the element should never be greater than 1, otherwise, the | |
1149 | * RCU implementation is broken. | |
1150 | */ | |
1151 | static int | |
1152 | rcu_torture_reader(void *arg) | |
1153 | { | |
917963d0 | 1154 | unsigned long started; |
6b80da42 | 1155 | unsigned long completed; |
72e9bb54 | 1156 | int idx; |
51b1130e | 1157 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1158 | struct rcu_torture *p; |
1159 | int pipe_count; | |
0729fbf3 | 1160 | struct timer_list t; |
52494535 | 1161 | unsigned long long ts; |
a241ec65 | 1162 | |
5ccf60f2 | 1163 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1164 | set_user_nice(current, MAX_NICE); |
0acc512c | 1165 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1166 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1167 | |
a241ec65 | 1168 | do { |
0acc512c | 1169 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1170 | if (!timer_pending(&t)) |
6155fec9 | 1171 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1172 | } |
72e9bb54 | 1173 | idx = cur_ops->readlock(); |
917963d0 PM |
1174 | if (cur_ops->started) |
1175 | started = cur_ops->started(); | |
1176 | else | |
1177 | started = cur_ops->completed(); | |
e4aa0da3 | 1178 | ts = rcu_trace_clock_local(); |
632ee200 | 1179 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1180 | rcu_read_lock_bh_held() || |
1181 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1182 | srcu_read_lock_held(srcu_ctlp) || |
1183 | torturing_tasks()); | |
a241ec65 PM |
1184 | if (p == NULL) { |
1185 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1186 | cur_ops->readunlock(idx); |
a241ec65 PM |
1187 | schedule_timeout_interruptible(HZ); |
1188 | continue; | |
1189 | } | |
996417d2 PM |
1190 | if (p->rtort_mbtest == 0) |
1191 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1192 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1193 | preempt_disable(); |
1194 | pipe_count = p->rtort_pipe_count; | |
1195 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1196 | /* Should not happen, but... */ | |
1197 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1198 | } | |
917963d0 | 1199 | completed = cur_ops->completed(); |
52494535 | 1200 | if (pipe_count > 1) { |
52494535 | 1201 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1202 | ts, started, completed); |
274529ba | 1203 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1204 | } |
dd17c8f7 | 1205 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1206 | completed = completed - started; |
1207 | if (cur_ops->started) | |
1208 | completed++; | |
a241ec65 PM |
1209 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1210 | /* Should not happen, but... */ | |
1211 | completed = RCU_TORTURE_PIPE_LEN; | |
1212 | } | |
dd17c8f7 | 1213 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1214 | preempt_enable(); |
72e9bb54 | 1215 | cur_ops->readunlock(idx); |
628edaa5 | 1216 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1217 | } while (!torture_must_stop()); |
424c1b68 | 1218 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1219 | del_timer_sync(&t); |
424c1b68 TG |
1220 | destroy_timer_on_stack(&t); |
1221 | } | |
7fafaac5 | 1222 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1223 | return 0; |
1224 | } | |
1225 | ||
1226 | /* | |
eea203fe JP |
1227 | * Print torture statistics. Caller must ensure that there is only |
1228 | * one call to this function at a given time!!! This is normally | |
1229 | * accomplished by relying on the module system to only have one copy | |
1230 | * of the module loaded, and then by giving the rcu_torture_stats | |
1231 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1232 | * thread is not running). | |
a241ec65 | 1233 | */ |
d1008950 | 1234 | static void |
eea203fe | 1235 | rcu_torture_stats_print(void) |
a241ec65 | 1236 | { |
a241ec65 PM |
1237 | int cpu; |
1238 | int i; | |
1239 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1240 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1241 | static unsigned long rtcv_snap = ULONG_MAX; |
4ffa6699 | 1242 | struct task_struct *wtp; |
a241ec65 | 1243 | |
0a945022 | 1244 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1245 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1246 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1247 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1248 | } | |
1249 | } | |
1250 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1251 | if (pipesummary[i] != 0) | |
1252 | break; | |
1253 | } | |
eea203fe JP |
1254 | |
1255 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1256 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1257 | rcu_torture_current, | |
1258 | rcu_torture_current_version, | |
1259 | list_empty(&rcu_torture_freelist), | |
1260 | atomic_read(&n_rcu_torture_alloc), | |
1261 | atomic_read(&n_rcu_torture_alloc_fail), | |
1262 | atomic_read(&n_rcu_torture_free)); | |
472213a6 | 1263 | pr_cont("rtmbe: %d rtbe: %ld rtbke: %ld rtbre: %ld ", |
eea203fe | 1264 | atomic_read(&n_rcu_torture_mberror), |
472213a6 | 1265 | n_rcu_torture_barrier_error, |
eea203fe JP |
1266 | n_rcu_torture_boost_ktrerror, |
1267 | n_rcu_torture_boost_rterror); | |
1268 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1269 | n_rcu_torture_boost_failure, | |
1270 | n_rcu_torture_boosts, | |
1271 | n_rcu_torture_timers); | |
1272 | torture_onoff_stats(); | |
38706bc5 | 1273 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1274 | n_barrier_successes, |
1275 | n_barrier_attempts, | |
1276 | n_rcu_torture_barrier_error); | |
38706bc5 | 1277 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1278 | |
1279 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1280 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1281 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1282 | n_rcu_torture_boost_ktrerror != 0 || |
1283 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1284 | n_rcu_torture_boost_failure != 0 || |
1285 | i > 1) { | |
eea203fe | 1286 | pr_cont("%s", "!!! "); |
996417d2 | 1287 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1288 | WARN_ON_ONCE(1); |
996417d2 | 1289 | } |
eea203fe | 1290 | pr_cont("Reader Pipe: "); |
a241ec65 | 1291 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1292 | pr_cont(" %ld", pipesummary[i]); |
1293 | pr_cont("\n"); | |
1294 | ||
1295 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1296 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1297 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1298 | pr_cont(" %ld", batchsummary[i]); |
1299 | pr_cont("\n"); | |
1300 | ||
1301 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1302 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1303 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1304 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1305 | } |
eea203fe JP |
1306 | pr_cont("\n"); |
1307 | ||
c8e5b163 | 1308 | if (cur_ops->stats) |
eea203fe | 1309 | cur_ops->stats(); |
ad0dc7f9 PM |
1310 | if (rtcv_snap == rcu_torture_current_version && |
1311 | rcu_torture_current != NULL) { | |
7f6733c3 PM |
1312 | int __maybe_unused flags = 0; |
1313 | unsigned long __maybe_unused gpnum = 0; | |
1314 | unsigned long __maybe_unused completed = 0; | |
ad0dc7f9 PM |
1315 | |
1316 | rcutorture_get_gp_data(cur_ops->ttype, | |
1317 | &flags, &gpnum, &completed); | |
7f6733c3 PM |
1318 | srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, |
1319 | &flags, &gpnum, &completed); | |
4ffa6699 | 1320 | wtp = READ_ONCE(writer_task); |
808de39c | 1321 | pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx cpu %d\n", |
18aff33e | 1322 | rcu_torture_writer_state_getname(), |
eea203fe | 1323 | rcu_torture_writer_state, |
4ffa6699 | 1324 | gpnum, completed, flags, |
808de39c PM |
1325 | wtp == NULL ? ~0UL : wtp->state, |
1326 | wtp == NULL ? -1 : (int)task_cpu(wtp)); | |
afea227f | 1327 | show_rcu_gp_kthreads(); |
274529ba | 1328 | rcu_ftrace_dump(DUMP_ALL); |
ad0dc7f9 PM |
1329 | } |
1330 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1331 | } |
1332 | ||
a241ec65 PM |
1333 | /* |
1334 | * Periodically prints torture statistics, if periodic statistics printing | |
1335 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1336 | */ |
1337 | static int | |
1338 | rcu_torture_stats(void *arg) | |
1339 | { | |
5ccf60f2 | 1340 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1341 | do { |
1342 | schedule_timeout_interruptible(stat_interval * HZ); | |
1343 | rcu_torture_stats_print(); | |
f67a3356 | 1344 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1345 | } while (!torture_must_stop()); |
7fafaac5 | 1346 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1347 | return 0; |
1348 | } | |
1349 | ||
95c38322 | 1350 | static inline void |
e66c33d5 | 1351 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1352 | { |
2caa1e44 PM |
1353 | pr_alert("%s" TORTURE_FLAG |
1354 | "--- %s: nreaders=%d nfakewriters=%d " | |
1355 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1356 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1357 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1358 | "test_boost=%d/%d test_boost_interval=%d " | |
1359 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1360 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1361 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1362 | "onoff_interval=%d onoff_holdoff=%d\n", |
1363 | torture_type, tag, nrealreaders, nfakewriters, | |
1364 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1365 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1366 | test_boost, cur_ops->can_boost, | |
1367 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1368 | stall_cpu, stall_cpu_holdoff, |
1369 | n_barrier_cbs, | |
2caa1e44 | 1370 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1371 | } |
1372 | ||
0ffd374b | 1373 | static int rcutorture_booster_cleanup(unsigned int cpu) |
8e8be45e PM |
1374 | { |
1375 | struct task_struct *t; | |
1376 | ||
1377 | if (boost_tasks[cpu] == NULL) | |
0ffd374b | 1378 | return 0; |
8e8be45e | 1379 | mutex_lock(&boost_mutex); |
8e8be45e PM |
1380 | t = boost_tasks[cpu]; |
1381 | boost_tasks[cpu] = NULL; | |
1382 | mutex_unlock(&boost_mutex); | |
1383 | ||
1384 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1385 | torture_stop_kthread(rcu_torture_boost, t); |
0ffd374b | 1386 | return 0; |
8e8be45e PM |
1387 | } |
1388 | ||
0ffd374b | 1389 | static int rcutorture_booster_init(unsigned int cpu) |
8e8be45e PM |
1390 | { |
1391 | int retval; | |
1392 | ||
1393 | if (boost_tasks[cpu] != NULL) | |
1394 | return 0; /* Already created, nothing more to do. */ | |
1395 | ||
1396 | /* Don't allow time recalculation while creating a new task. */ | |
1397 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1398 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1399 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1400 | cpu_to_node(cpu), | |
1401 | "rcu_torture_boost"); | |
8e8be45e PM |
1402 | if (IS_ERR(boost_tasks[cpu])) { |
1403 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1404 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1405 | n_rcu_torture_boost_ktrerror++; |
1406 | boost_tasks[cpu] = NULL; | |
1407 | mutex_unlock(&boost_mutex); | |
1408 | return retval; | |
1409 | } | |
1410 | kthread_bind(boost_tasks[cpu], cpu); | |
1411 | wake_up_process(boost_tasks[cpu]); | |
1412 | mutex_unlock(&boost_mutex); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
c13f3757 PM |
1416 | /* |
1417 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1418 | * induces a CPU stall for the time specified by stall_cpu. | |
1419 | */ | |
49fb4c62 | 1420 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1421 | { |
1422 | unsigned long stop_at; | |
1423 | ||
5ccf60f2 | 1424 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1425 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1426 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1427 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1428 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1429 | } |
1430 | if (!kthread_should_stop()) { | |
1431 | stop_at = get_seconds() + stall_cpu; | |
1432 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1433 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1434 | rcu_read_lock(); |
1435 | preempt_disable(); | |
1436 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1437 | continue; /* Induce RCU CPU stall warning. */ | |
1438 | preempt_enable(); | |
1439 | rcu_read_unlock(); | |
2caa1e44 | 1440 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1441 | } |
f67a3356 | 1442 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1443 | while (!kthread_should_stop()) |
1444 | schedule_timeout_interruptible(10 * HZ); | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1449 | static int __init rcu_torture_stall_init(void) | |
1450 | { | |
c13f3757 PM |
1451 | if (stall_cpu <= 0) |
1452 | return 0; | |
47cf29b9 | 1453 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1454 | } |
1455 | ||
fae4b54f | 1456 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1457 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1458 | { |
1459 | atomic_inc(&barrier_cbs_invoked); | |
1460 | } | |
1461 | ||
1462 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1463 | static int rcu_torture_barrier_cbs(void *arg) | |
1464 | { | |
1465 | long myid = (long)arg; | |
c6ebcbb6 | 1466 | bool lastphase = 0; |
78e4bc34 | 1467 | bool newphase; |
fae4b54f PM |
1468 | struct rcu_head rcu; |
1469 | ||
1470 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1471 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1472 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1473 | do { |
1474 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1475 | (newphase = |
6c7ed42c | 1476 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1477 | torture_must_stop()); |
78e4bc34 | 1478 | lastphase = newphase; |
36970bb9 | 1479 | if (torture_must_stop()) |
fae4b54f | 1480 | break; |
6c7ed42c PM |
1481 | /* |
1482 | * The above smp_load_acquire() ensures barrier_phase load | |
aab05738 | 1483 | * is ordered before the following ->call(). |
6c7ed42c | 1484 | */ |
0aa67e75 | 1485 | local_irq_disable(); /* Just to test no-irq call_rcu(). */ |
fae4b54f | 1486 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
0aa67e75 | 1487 | local_irq_enable(); |
fae4b54f PM |
1488 | if (atomic_dec_and_test(&barrier_cbs_count)) |
1489 | wake_up(&barrier_wq); | |
36970bb9 | 1490 | } while (!torture_must_stop()); |
69c60455 PM |
1491 | if (cur_ops->cb_barrier != NULL) |
1492 | cur_ops->cb_barrier(); | |
fae4b54f | 1493 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1494 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1495 | return 0; |
1496 | } | |
1497 | ||
1498 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1499 | static int rcu_torture_barrier(void *arg) | |
1500 | { | |
1501 | int i; | |
1502 | ||
5ccf60f2 | 1503 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1504 | do { |
1505 | atomic_set(&barrier_cbs_invoked, 0); | |
1506 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1507 | /* Ensure barrier_phase ordered after prior assignments. */ |
1508 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1509 | for (i = 0; i < n_barrier_cbs; i++) |
1510 | wake_up(&barrier_cbs_wq[i]); | |
1511 | wait_event(barrier_wq, | |
1512 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1513 | torture_must_stop()); |
1514 | if (torture_must_stop()) | |
fae4b54f PM |
1515 | break; |
1516 | n_barrier_attempts++; | |
78e4bc34 | 1517 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1518 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1519 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1520 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1521 | atomic_read(&barrier_cbs_invoked), | |
1522 | n_barrier_cbs); | |
fae4b54f PM |
1523 | WARN_ON_ONCE(1); |
1524 | } | |
1525 | n_barrier_successes++; | |
1526 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1527 | } while (!torture_must_stop()); |
7fafaac5 | 1528 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1529 | return 0; |
1530 | } | |
1531 | ||
1532 | /* Initialize RCU barrier testing. */ | |
1533 | static int rcu_torture_barrier_init(void) | |
1534 | { | |
1535 | int i; | |
1536 | int ret; | |
1537 | ||
d9eba768 | 1538 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1539 | return 0; |
1540 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1541 | pr_alert("%s" TORTURE_FLAG |
1542 | " Call or barrier ops missing for %s,\n", | |
1543 | torture_type, cur_ops->name); | |
1544 | pr_alert("%s" TORTURE_FLAG | |
1545 | " RCU barrier testing omitted from run.\n", | |
1546 | torture_type); | |
fae4b54f PM |
1547 | return 0; |
1548 | } | |
1549 | atomic_set(&barrier_cbs_count, 0); | |
1550 | atomic_set(&barrier_cbs_invoked, 0); | |
1551 | barrier_cbs_tasks = | |
1552 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1553 | GFP_KERNEL); | |
1554 | barrier_cbs_wq = | |
1555 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1556 | GFP_KERNEL); | |
de5e6437 | 1557 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1558 | return -ENOMEM; |
1559 | for (i = 0; i < n_barrier_cbs; i++) { | |
1560 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1561 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1562 | (void *)(long)i, | |
1563 | barrier_cbs_tasks[i]); | |
1564 | if (ret) | |
fae4b54f | 1565 | return ret; |
fae4b54f | 1566 | } |
47cf29b9 | 1567 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1568 | } |
1569 | ||
1570 | /* Clean up after RCU barrier testing. */ | |
1571 | static void rcu_torture_barrier_cleanup(void) | |
1572 | { | |
1573 | int i; | |
1574 | ||
9c029b86 | 1575 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1576 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1577 | for (i = 0; i < n_barrier_cbs; i++) |
1578 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1579 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1580 | kfree(barrier_cbs_tasks); |
1581 | barrier_cbs_tasks = NULL; | |
1582 | } | |
1583 | if (barrier_cbs_wq != NULL) { | |
1584 | kfree(barrier_cbs_wq); | |
1585 | barrier_cbs_wq = NULL; | |
1586 | } | |
1587 | } | |
1588 | ||
0ffd374b | 1589 | static enum cpuhp_state rcutor_hp; |
8e8be45e | 1590 | |
a241ec65 PM |
1591 | static void |
1592 | rcu_torture_cleanup(void) | |
1593 | { | |
1594 | int i; | |
1595 | ||
4a298656 | 1596 | rcutorture_record_test_transition(); |
d36a7a0d | 1597 | if (torture_cleanup_begin()) { |
343e9099 PM |
1598 | if (cur_ops->cb_barrier != NULL) |
1599 | cur_ops->cb_barrier(); | |
1600 | return; | |
1601 | } | |
d84f5203 | 1602 | |
fae4b54f | 1603 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1604 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1605 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1606 | |
c8e5b163 | 1607 | if (reader_tasks) { |
9c029b86 PM |
1608 | for (i = 0; i < nrealreaders; i++) |
1609 | torture_stop_kthread(rcu_torture_reader, | |
1610 | reader_tasks[i]); | |
a241ec65 | 1611 | kfree(reader_tasks); |
a241ec65 PM |
1612 | } |
1613 | rcu_torture_current = NULL; | |
1614 | ||
c8e5b163 | 1615 | if (fakewriter_tasks) { |
b772e1dd | 1616 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1617 | torture_stop_kthread(rcu_torture_fakewriter, |
1618 | fakewriter_tasks[i]); | |
b772e1dd JT |
1619 | } |
1620 | kfree(fakewriter_tasks); | |
1621 | fakewriter_tasks = NULL; | |
1622 | } | |
1623 | ||
9c029b86 PM |
1624 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1625 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1626 | for (i = 0; i < ncbflooders; i++) |
1627 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e | 1628 | if ((test_boost == 1 && cur_ops->can_boost) || |
0ffd374b SAS |
1629 | test_boost == 2) |
1630 | cpuhp_remove_state(rcutor_hp); | |
bf66f18e | 1631 | |
ca1d51ed PM |
1632 | /* |
1633 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1634 | * cleanup operations. | |
1635 | */ | |
2326974d PM |
1636 | if (cur_ops->cb_barrier != NULL) |
1637 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
1638 | if (cur_ops->cleanup != NULL) |
1639 | cur_ops->cleanup(); | |
a241ec65 | 1640 | |
a241ec65 | 1641 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1642 | |
fae4b54f | 1643 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1644 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1645 | else if (torture_onoff_failures()) |
091541bb PM |
1646 | rcu_torture_print_module_parms(cur_ops, |
1647 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1648 | else |
8e8be45e | 1649 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1650 | torture_cleanup_end(); |
a241ec65 PM |
1651 | } |
1652 | ||
d2818df1 PM |
1653 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1654 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1655 | { | |
1656 | } | |
1657 | ||
1658 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1659 | { | |
1660 | /* | |
1661 | * This -might- happen due to race conditions, but is unlikely. | |
1662 | * The scenario that leads to this happening is that the | |
1663 | * first of the pair of duplicate callbacks is queued, | |
1664 | * someone else starts a grace period that includes that | |
1665 | * callback, then the second of the pair must wait for the | |
1666 | * next grace period. Unlikely, but can happen. If it | |
1667 | * does happen, the debug-objects subsystem won't have splatted. | |
1668 | */ | |
1669 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1670 | } | |
1671 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1672 | ||
1673 | /* | |
1674 | * Verify that double-free causes debug-objects to complain, but only | |
1675 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1676 | * cannot be carried out. | |
1677 | */ | |
1678 | static void rcu_test_debug_objects(void) | |
1679 | { | |
1680 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1681 | struct rcu_head rh1; | |
1682 | struct rcu_head rh2; | |
1683 | ||
1684 | init_rcu_head_on_stack(&rh1); | |
1685 | init_rcu_head_on_stack(&rh2); | |
1686 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1687 | ||
1688 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1689 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1690 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1691 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1692 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1693 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1694 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1695 | local_irq_enable(); | |
1696 | rcu_read_unlock(); | |
1697 | preempt_enable(); | |
1698 | ||
1699 | /* Wait for them all to get done so we can safely return. */ | |
1700 | rcu_barrier(); | |
1701 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1702 | destroy_rcu_head_on_stack(&rh1); | |
1703 | destroy_rcu_head_on_stack(&rh2); | |
1704 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1705 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1706 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1707 | } | |
1708 | ||
6f8bc500 | 1709 | static int __init |
a241ec65 PM |
1710 | rcu_torture_init(void) |
1711 | { | |
1712 | int i; | |
1713 | int cpu; | |
1714 | int firsterr = 0; | |
2ec1f2d9 | 1715 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed | 1716 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
7e42776d | 1717 | &sched_ops, &tasks_ops, |
2ec1f2d9 | 1718 | }; |
a241ec65 | 1719 | |
59da22a0 | 1720 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1721 | return -EBUSY; |
343e9099 | 1722 | |
a241ec65 | 1723 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1724 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1725 | cur_ops = torture_ops[i]; |
ade5fb81 | 1726 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1727 | break; |
72e9bb54 | 1728 | } |
ade5fb81 | 1729 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1730 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1731 | torture_type); | |
1732 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1733 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1734 | pr_alert(" %s", torture_ops[i]->name); |
1735 | pr_alert("\n"); | |
889d487a PM |
1736 | firsterr = -EINVAL; |
1737 | goto unwind; | |
72e9bb54 | 1738 | } |
bf66f18e | 1739 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1740 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1741 | fqs_duration = 0; |
1742 | } | |
c8e5b163 | 1743 | if (cur_ops->init) |
889d487a | 1744 | cur_ops->init(); |
72e9bb54 | 1745 | |
64e4b43a | 1746 | if (nreaders >= 0) { |
a241ec65 | 1747 | nrealreaders = nreaders; |
64e4b43a | 1748 | } else { |
3838cc18 | 1749 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
1750 | if (nrealreaders <= 0) |
1751 | nrealreaders = 1; | |
1752 | } | |
8e8be45e | 1753 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1754 | |
1755 | /* Set up the freelist. */ | |
1756 | ||
1757 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1758 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1759 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1760 | list_add_tail(&rcu_tortures[i].rtort_free, |
1761 | &rcu_torture_freelist); | |
1762 | } | |
1763 | ||
1764 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1765 | ||
1766 | rcu_torture_current = NULL; | |
1767 | rcu_torture_current_version = 0; | |
1768 | atomic_set(&n_rcu_torture_alloc, 0); | |
1769 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1770 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1771 | atomic_set(&n_rcu_torture_mberror, 0); |
1772 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1773 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1774 | n_rcu_torture_boost_ktrerror = 0; |
1775 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1776 | n_rcu_torture_boost_failure = 0; |
1777 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1778 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1779 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1780 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1781 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1782 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1783 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1784 | } | |
1785 | } | |
1786 | ||
1787 | /* Start up the kthreads. */ | |
1788 | ||
47cf29b9 PM |
1789 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1790 | writer_task); | |
1791 | if (firsterr) | |
a241ec65 | 1792 | goto unwind; |
4444d852 PM |
1793 | if (nfakewriters > 0) { |
1794 | fakewriter_tasks = kzalloc(nfakewriters * | |
1795 | sizeof(fakewriter_tasks[0]), | |
1796 | GFP_KERNEL); | |
1797 | if (fakewriter_tasks == NULL) { | |
1798 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1799 | firsterr = -ENOMEM; | |
1800 | goto unwind; | |
1801 | } | |
b772e1dd JT |
1802 | } |
1803 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1804 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1805 | NULL, fakewriter_tasks[i]); | |
1806 | if (firsterr) | |
b772e1dd | 1807 | goto unwind; |
b772e1dd | 1808 | } |
2860aaba | 1809 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1810 | GFP_KERNEL); |
1811 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1812 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1813 | firsterr = -ENOMEM; |
1814 | goto unwind; | |
1815 | } | |
1816 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1817 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1818 | reader_tasks[i]); | |
1819 | if (firsterr) | |
a241ec65 | 1820 | goto unwind; |
a241ec65 PM |
1821 | } |
1822 | if (stat_interval > 0) { | |
47cf29b9 PM |
1823 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1824 | stats_task); | |
1825 | if (firsterr) | |
a241ec65 | 1826 | goto unwind; |
a241ec65 | 1827 | } |
e8e255f7 | 1828 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
1829 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1830 | if (firsterr) | |
d84f5203 | 1831 | goto unwind; |
d84f5203 | 1832 | } |
d120f65f PM |
1833 | if (stutter < 0) |
1834 | stutter = 0; | |
1835 | if (stutter) { | |
628edaa5 PM |
1836 | firsterr = torture_stutter_init(stutter * HZ); |
1837 | if (firsterr) | |
d120f65f | 1838 | goto unwind; |
d120f65f | 1839 | } |
bf66f18e PM |
1840 | if (fqs_duration < 0) |
1841 | fqs_duration = 0; | |
1842 | if (fqs_duration) { | |
628edaa5 | 1843 | /* Create the fqs thread */ |
d0d0606e PM |
1844 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1845 | fqs_task); | |
47cf29b9 | 1846 | if (firsterr) |
bf66f18e | 1847 | goto unwind; |
bf66f18e | 1848 | } |
8e8be45e PM |
1849 | if (test_boost_interval < 1) |
1850 | test_boost_interval = 1; | |
1851 | if (test_boost_duration < 2) | |
1852 | test_boost_duration = 2; | |
1853 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1854 | test_boost == 2) { | |
8e8be45e PM |
1855 | |
1856 | boost_starttime = jiffies + test_boost_interval * HZ; | |
0ffd374b SAS |
1857 | |
1858 | firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE", | |
1859 | rcutorture_booster_init, | |
1860 | rcutorture_booster_cleanup); | |
1861 | if (firsterr < 0) | |
1862 | goto unwind; | |
1863 | rcutor_hp = firsterr; | |
8e8be45e | 1864 | } |
01025ebc PM |
1865 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1866 | if (firsterr) | |
37e377d2 | 1867 | goto unwind; |
01025ebc PM |
1868 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1869 | if (firsterr) | |
37e377d2 | 1870 | goto unwind; |
01025ebc PM |
1871 | firsterr = rcu_torture_stall_init(); |
1872 | if (firsterr) | |
37e377d2 | 1873 | goto unwind; |
01025ebc PM |
1874 | firsterr = rcu_torture_barrier_init(); |
1875 | if (firsterr) | |
fae4b54f | 1876 | goto unwind; |
d2818df1 PM |
1877 | if (object_debug) |
1878 | rcu_test_debug_objects(); | |
38706bc5 PM |
1879 | if (cbflood_n_burst > 0) { |
1880 | /* Create the cbflood threads */ | |
1881 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1882 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1883 | GFP_KERNEL); | |
1884 | if (!cbflood_task) { | |
1885 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1886 | firsterr = -ENOMEM; | |
1887 | goto unwind; | |
1888 | } | |
1889 | for (i = 0; i < ncbflooders; i++) { | |
1890 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1891 | NULL, | |
1892 | cbflood_task[i]); | |
1893 | if (firsterr) | |
1894 | goto unwind; | |
1895 | } | |
1896 | } | |
4a298656 | 1897 | rcutorture_record_test_transition(); |
b5daa8f3 | 1898 | torture_init_end(); |
a241ec65 PM |
1899 | return 0; |
1900 | ||
1901 | unwind: | |
b5daa8f3 | 1902 | torture_init_end(); |
a241ec65 PM |
1903 | rcu_torture_cleanup(); |
1904 | return firsterr; | |
1905 | } | |
1906 | ||
1907 | module_init(rcu_torture_init); | |
1908 | module_exit(rcu_torture_cleanup); |