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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(); | |
202 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
203 | return ts; | |
204 | } | |
205 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
206 | static u64 notrace rcu_trace_clock_local(void) | |
207 | { | |
208 | return 0ULL; | |
209 | } | |
210 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
211 | ||
8e8be45e | 212 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 213 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 214 | /* and boost task create/destroy. */ |
fae4b54f | 215 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 216 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
217 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
218 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
219 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 220 | |
a241ec65 PM |
221 | /* |
222 | * Allocate an element from the rcu_tortures pool. | |
223 | */ | |
97a41e26 | 224 | static struct rcu_torture * |
a241ec65 PM |
225 | rcu_torture_alloc(void) |
226 | { | |
227 | struct list_head *p; | |
228 | ||
adac1665 | 229 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
230 | if (list_empty(&rcu_torture_freelist)) { |
231 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 232 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
233 | return NULL; |
234 | } | |
235 | atomic_inc(&n_rcu_torture_alloc); | |
236 | p = rcu_torture_freelist.next; | |
237 | list_del_init(p); | |
adac1665 | 238 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
239 | return container_of(p, struct rcu_torture, rtort_free); |
240 | } | |
241 | ||
242 | /* | |
243 | * Free an element to the rcu_tortures pool. | |
244 | */ | |
245 | static void | |
246 | rcu_torture_free(struct rcu_torture *p) | |
247 | { | |
248 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 249 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 250 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 251 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
252 | } |
253 | ||
72e9bb54 PM |
254 | /* |
255 | * Operations vector for selecting different types of tests. | |
256 | */ | |
257 | ||
258 | struct rcu_torture_ops { | |
ad0dc7f9 | 259 | int ttype; |
72e9bb54 | 260 | void (*init)(void); |
ca1d51ed | 261 | void (*cleanup)(void); |
72e9bb54 | 262 | int (*readlock)(void); |
51b1130e | 263 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 264 | void (*readunlock)(int idx); |
917963d0 | 265 | unsigned long (*started)(void); |
6b80da42 | 266 | unsigned long (*completed)(void); |
0acc512c | 267 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 268 | void (*sync)(void); |
2ec1f2d9 | 269 | void (*exp_sync)(void); |
a48f3fad PM |
270 | unsigned long (*get_state)(void); |
271 | void (*cond_sync)(unsigned long oldstate); | |
db3e8db4 | 272 | call_rcu_func_t call; |
2326974d | 273 | void (*cb_barrier)(void); |
bf66f18e | 274 | void (*fqs)(void); |
eea203fe | 275 | void (*stats)(void); |
0acc512c | 276 | int irq_capable; |
8e8be45e | 277 | int can_boost; |
e66c33d5 | 278 | const char *name; |
72e9bb54 | 279 | }; |
a71fca58 PM |
280 | |
281 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
282 | |
283 | /* | |
284 | * Definitions for rcu torture testing. | |
285 | */ | |
286 | ||
a49a4af7 | 287 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
288 | { |
289 | rcu_read_lock(); | |
290 | return 0; | |
291 | } | |
292 | ||
51b1130e | 293 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 294 | { |
d0af39e8 PM |
295 | unsigned long started; |
296 | unsigned long completed; | |
b8d57a76 JT |
297 | const unsigned long shortdelay_us = 200; |
298 | const unsigned long longdelay_ms = 50; | |
d0af39e8 | 299 | unsigned long long ts; |
b2896d2e | 300 | |
b8d57a76 JT |
301 | /* We want a short delay sometimes to make a reader delay the grace |
302 | * period, and we want a long delay occasionally to trigger | |
303 | * force_quiescent_state. */ | |
b2896d2e | 304 | |
d0af39e8 PM |
305 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) { |
306 | started = cur_ops->completed(); | |
307 | ts = rcu_trace_clock_local(); | |
b8d57a76 | 308 | mdelay(longdelay_ms); |
d0af39e8 PM |
309 | completed = cur_ops->completed(); |
310 | do_trace_rcu_torture_read(cur_ops->name, NULL, ts, | |
311 | started, completed); | |
312 | } | |
51b1130e | 313 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 314 | udelay(shortdelay_us); |
e546f485 | 315 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
316 | if (!preempt_count() && |
317 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
318 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
319 | #endif | |
b2896d2e PM |
320 | } |
321 | ||
a49a4af7 | 322 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
323 | { |
324 | rcu_read_unlock(); | |
325 | } | |
326 | ||
a48f3fad PM |
327 | /* |
328 | * Update callback in the pipe. This should be invoked after a grace period. | |
329 | */ | |
330 | static bool | |
331 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
332 | { | |
333 | int i; | |
334 | ||
335 | i = rp->rtort_pipe_count; | |
336 | if (i > RCU_TORTURE_PIPE_LEN) | |
337 | i = RCU_TORTURE_PIPE_LEN; | |
338 | atomic_inc(&rcu_torture_wcount[i]); | |
339 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
340 | rp->rtort_mbtest = 0; | |
341 | return true; | |
342 | } | |
343 | return false; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
348 | * primitives. | |
349 | */ | |
350 | static void | |
351 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
352 | { | |
353 | struct rcu_torture *rp; | |
354 | struct rcu_torture *rp1; | |
355 | ||
356 | if (old_rp) | |
357 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
358 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
359 | if (rcu_torture_pipe_update_one(rp)) { | |
360 | list_del(&rp->rtort_free); | |
361 | rcu_torture_free(rp); | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
72e9bb54 PM |
366 | static void |
367 | rcu_torture_cb(struct rcu_head *p) | |
368 | { | |
72e9bb54 PM |
369 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
370 | ||
36970bb9 | 371 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
372 | /* Test is ending, just drop callbacks on the floor. */ |
373 | /* The next initialization will pick up the pieces. */ | |
374 | return; | |
375 | } | |
a48f3fad | 376 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 377 | rcu_torture_free(rp); |
a48f3fad | 378 | else |
0acc512c | 379 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
380 | } |
381 | ||
6b80da42 | 382 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
383 | { |
384 | return 0; | |
385 | } | |
386 | ||
72e9bb54 PM |
387 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
388 | { | |
389 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
390 | } | |
391 | ||
e3033736 JT |
392 | static void rcu_sync_torture_init(void) |
393 | { | |
394 | INIT_LIST_HEAD(&rcu_torture_removed); | |
395 | } | |
396 | ||
2ec1f2d9 | 397 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 398 | .ttype = RCU_FLAVOR, |
0acc512c | 399 | .init = rcu_sync_torture_init, |
0acc512c PM |
400 | .readlock = rcu_torture_read_lock, |
401 | .read_delay = rcu_read_delay, | |
402 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 403 | .started = rcu_batches_started, |
1e32eaee | 404 | .completed = rcu_batches_completed, |
2ec1f2d9 | 405 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 406 | .sync = synchronize_rcu, |
2ec1f2d9 | 407 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
408 | .get_state = get_state_synchronize_rcu, |
409 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
410 | .call = call_rcu, |
411 | .cb_barrier = rcu_barrier, | |
bf66f18e | 412 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
413 | .stats = NULL, |
414 | .irq_capable = 1, | |
8e8be45e | 415 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 416 | .name = "rcu" |
d9a3da06 PM |
417 | }; |
418 | ||
c32e0660 PM |
419 | /* |
420 | * Definitions for rcu_bh torture testing. | |
421 | */ | |
422 | ||
a49a4af7 | 423 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
424 | { |
425 | rcu_read_lock_bh(); | |
426 | return 0; | |
427 | } | |
428 | ||
a49a4af7 | 429 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
430 | { |
431 | rcu_read_unlock_bh(); | |
432 | } | |
433 | ||
c32e0660 PM |
434 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
435 | { | |
436 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
437 | } | |
438 | ||
439 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 440 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 441 | .init = rcu_sync_torture_init, |
0acc512c PM |
442 | .readlock = rcu_bh_torture_read_lock, |
443 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
444 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 445 | .started = rcu_batches_started_bh, |
1e32eaee | 446 | .completed = rcu_batches_completed_bh, |
0acc512c | 447 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 448 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 449 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 450 | .call = call_rcu_bh, |
0acc512c | 451 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 452 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
453 | .stats = NULL, |
454 | .irq_capable = 1, | |
455 | .name = "rcu_bh" | |
c32e0660 PM |
456 | }; |
457 | ||
ff20e251 PM |
458 | /* |
459 | * Don't even think about trying any of these in real life!!! | |
460 | * The names includes "busted", and they really means it! | |
461 | * The only purpose of these functions is to provide a buggy RCU | |
462 | * implementation to make sure that rcutorture correctly emits | |
463 | * buggy-RCU error messages. | |
464 | */ | |
465 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
466 | { | |
467 | /* This is a deliberate bug for testing purposes only! */ | |
468 | rcu_torture_cb(&p->rtort_rcu); | |
469 | } | |
470 | ||
471 | static void synchronize_rcu_busted(void) | |
472 | { | |
473 | /* This is a deliberate bug for testing purposes only! */ | |
474 | } | |
475 | ||
476 | static void | |
b6a4ae76 | 477 | call_rcu_busted(struct rcu_head *head, rcu_callback_t func) |
ff20e251 PM |
478 | { |
479 | /* This is a deliberate bug for testing purposes only! */ | |
480 | func(head); | |
481 | } | |
482 | ||
483 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 484 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
485 | .init = rcu_sync_torture_init, |
486 | .readlock = rcu_torture_read_lock, | |
487 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
488 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 489 | .started = rcu_no_completed, |
ff20e251 PM |
490 | .completed = rcu_no_completed, |
491 | .deferred_free = rcu_busted_torture_deferred_free, | |
492 | .sync = synchronize_rcu_busted, | |
493 | .exp_sync = synchronize_rcu_busted, | |
494 | .call = call_rcu_busted, | |
495 | .cb_barrier = NULL, | |
496 | .fqs = NULL, | |
497 | .stats = NULL, | |
498 | .irq_capable = 1, | |
499 | .name = "rcu_busted" | |
500 | }; | |
501 | ||
b2896d2e PM |
502 | /* |
503 | * Definitions for srcu torture testing. | |
504 | */ | |
505 | ||
cda4dc81 | 506 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
507 | static struct srcu_struct srcu_ctld; |
508 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 509 | |
ca1d51ed | 510 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 511 | { |
ca1d51ed | 512 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
513 | } |
514 | ||
51b1130e | 515 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
516 | { |
517 | long delay; | |
518 | const long uspertick = 1000000 / HZ; | |
519 | const long longdelay = 10; | |
520 | ||
521 | /* We want there to be long-running readers, but not all the time. */ | |
522 | ||
51b1130e PM |
523 | delay = torture_random(rrsp) % |
524 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
525 | if (!delay) |
526 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
527 | else |
528 | rcu_read_delay(rrsp); | |
b2896d2e PM |
529 | } |
530 | ||
ca1d51ed | 531 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 532 | { |
ca1d51ed | 533 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
534 | } |
535 | ||
6b80da42 | 536 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 537 | { |
ca1d51ed | 538 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
539 | } |
540 | ||
9059c940 LJ |
541 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
542 | { | |
ca1d51ed | 543 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
544 | } |
545 | ||
b772e1dd JT |
546 | static void srcu_torture_synchronize(void) |
547 | { | |
ca1d51ed | 548 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
549 | } |
550 | ||
e3f8d378 | 551 | static void srcu_torture_call(struct rcu_head *head, |
b6a4ae76 | 552 | rcu_callback_t func) |
e3f8d378 | 553 | { |
ca1d51ed | 554 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
555 | } |
556 | ||
557 | static void srcu_torture_barrier(void) | |
558 | { | |
ca1d51ed | 559 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
560 | } |
561 | ||
eea203fe | 562 | static void srcu_torture_stats(void) |
b2896d2e | 563 | { |
32071141 PM |
564 | int __maybe_unused cpu; |
565 | int idx; | |
b2896d2e | 566 | |
da915ad5 PM |
567 | #ifdef CONFIG_TREE_SRCU |
568 | idx = srcu_ctlp->srcu_idx & 0x1; | |
32071141 | 569 | pr_alert("%s%s Tree SRCU per-CPU(idx=%d):", |
eea203fe | 570 | torture_type, TORTURE_FLAG, idx); |
b2896d2e | 571 | for_each_possible_cpu(cpu) { |
f2c46896 LR |
572 | unsigned long l0, l1; |
573 | unsigned long u0, u1; | |
589a8f59 | 574 | long c0, c1; |
da915ad5 | 575 | struct srcu_data *counts; |
589a8f59 | 576 | |
da915ad5 PM |
577 | counts = per_cpu_ptr(srcu_ctlp->sda, cpu); |
578 | u0 = counts->srcu_unlock_count[!idx]; | |
579 | u1 = counts->srcu_unlock_count[idx]; | |
f2c46896 LR |
580 | |
581 | /* | |
582 | * Make sure that a lock is always counted if the corresponding | |
583 | * unlock is counted. | |
584 | */ | |
585 | smp_rmb(); | |
586 | ||
da915ad5 PM |
587 | l0 = counts->srcu_lock_count[!idx]; |
588 | l1 = counts->srcu_lock_count[idx]; | |
f2c46896 LR |
589 | |
590 | c0 = l0 - u0; | |
591 | c1 = l1 - u1; | |
eea203fe | 592 | pr_cont(" %d(%ld,%ld)", cpu, c0, c1); |
b2896d2e | 593 | } |
eea203fe | 594 | pr_cont("\n"); |
32071141 PM |
595 | #elif defined(CONFIG_TINY_SRCU) |
596 | idx = READ_ONCE(srcu_ctlp->srcu_idx) & 0x1; | |
3ddf20c9 | 597 | pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n", |
32071141 PM |
598 | torture_type, TORTURE_FLAG, idx, |
599 | READ_ONCE(srcu_ctlp->srcu_lock_nesting[!idx]), | |
600 | READ_ONCE(srcu_ctlp->srcu_lock_nesting[idx])); | |
d8be8173 | 601 | #endif |
b2896d2e PM |
602 | } |
603 | ||
2ec1f2d9 PM |
604 | static void srcu_torture_synchronize_expedited(void) |
605 | { | |
ca1d51ed | 606 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
607 | } |
608 | ||
b2896d2e | 609 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 610 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 611 | .init = rcu_sync_torture_init, |
0acc512c PM |
612 | .readlock = srcu_torture_read_lock, |
613 | .read_delay = srcu_read_delay, | |
614 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 615 | .started = NULL, |
0acc512c | 616 | .completed = srcu_torture_completed, |
9059c940 | 617 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 618 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 619 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
620 | .call = srcu_torture_call, |
621 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
622 | .stats = srcu_torture_stats, |
623 | .name = "srcu" | |
b2896d2e PM |
624 | }; |
625 | ||
ca1d51ed PM |
626 | static void srcu_torture_init(void) |
627 | { | |
628 | rcu_sync_torture_init(); | |
629 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
630 | srcu_ctlp = &srcu_ctld; | |
631 | } | |
632 | ||
633 | static void srcu_torture_cleanup(void) | |
634 | { | |
635 | cleanup_srcu_struct(&srcu_ctld); | |
636 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ | |
637 | } | |
638 | ||
639 | /* As above, but dynamically allocated. */ | |
640 | static struct rcu_torture_ops srcud_ops = { | |
641 | .ttype = SRCU_FLAVOR, | |
642 | .init = srcu_torture_init, | |
643 | .cleanup = srcu_torture_cleanup, | |
644 | .readlock = srcu_torture_read_lock, | |
645 | .read_delay = srcu_read_delay, | |
646 | .readunlock = srcu_torture_read_unlock, | |
647 | .started = NULL, | |
648 | .completed = srcu_torture_completed, | |
649 | .deferred_free = srcu_torture_deferred_free, | |
650 | .sync = srcu_torture_synchronize, | |
651 | .exp_sync = srcu_torture_synchronize_expedited, | |
652 | .call = srcu_torture_call, | |
653 | .cb_barrier = srcu_torture_barrier, | |
654 | .stats = srcu_torture_stats, | |
655 | .name = "srcud" | |
656 | }; | |
657 | ||
4b6c2cca JT |
658 | /* |
659 | * Definitions for sched torture testing. | |
660 | */ | |
661 | ||
662 | static int sched_torture_read_lock(void) | |
663 | { | |
664 | preempt_disable(); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static void sched_torture_read_unlock(int idx) | |
669 | { | |
670 | preempt_enable(); | |
671 | } | |
672 | ||
2326974d PM |
673 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
674 | { | |
675 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
676 | } | |
677 | ||
4b6c2cca | 678 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 679 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 680 | .init = rcu_sync_torture_init, |
0acc512c PM |
681 | .readlock = sched_torture_read_lock, |
682 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
683 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 684 | .started = rcu_batches_started_sched, |
1e32eaee | 685 | .completed = rcu_batches_completed_sched, |
0acc512c | 686 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 687 | .sync = synchronize_sched, |
2ec1f2d9 | 688 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
689 | .get_state = get_state_synchronize_sched, |
690 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 691 | .call = call_rcu_sched, |
0acc512c | 692 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 693 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
694 | .stats = NULL, |
695 | .irq_capable = 1, | |
696 | .name = "sched" | |
4b6c2cca JT |
697 | }; |
698 | ||
69c60455 PM |
699 | #ifdef CONFIG_TASKS_RCU |
700 | ||
701 | /* | |
702 | * Definitions for RCU-tasks torture testing. | |
703 | */ | |
704 | ||
705 | static int tasks_torture_read_lock(void) | |
706 | { | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static void tasks_torture_read_unlock(int idx) | |
711 | { | |
712 | } | |
713 | ||
714 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
715 | { | |
716 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
717 | } | |
718 | ||
719 | static struct rcu_torture_ops tasks_ops = { | |
720 | .ttype = RCU_TASKS_FLAVOR, | |
721 | .init = rcu_sync_torture_init, | |
722 | .readlock = tasks_torture_read_lock, | |
723 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
724 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 725 | .started = rcu_no_completed, |
69c60455 PM |
726 | .completed = rcu_no_completed, |
727 | .deferred_free = rcu_tasks_torture_deferred_free, | |
728 | .sync = synchronize_rcu_tasks, | |
729 | .exp_sync = synchronize_rcu_tasks, | |
730 | .call = call_rcu_tasks, | |
731 | .cb_barrier = rcu_barrier_tasks, | |
732 | .fqs = NULL, | |
733 | .stats = NULL, | |
734 | .irq_capable = 1, | |
735 | .name = "tasks" | |
736 | }; | |
737 | ||
738 | #define RCUTORTURE_TASKS_OPS &tasks_ops, | |
739 | ||
5be5d1a1 PM |
740 | static bool __maybe_unused torturing_tasks(void) |
741 | { | |
742 | return cur_ops == &tasks_ops; | |
743 | } | |
744 | ||
69c60455 PM |
745 | #else /* #ifdef CONFIG_TASKS_RCU */ |
746 | ||
747 | #define RCUTORTURE_TASKS_OPS | |
748 | ||
4f441a25 | 749 | static bool __maybe_unused torturing_tasks(void) |
5be5d1a1 PM |
750 | { |
751 | return false; | |
752 | } | |
753 | ||
69c60455 PM |
754 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ |
755 | ||
8e8be45e PM |
756 | /* |
757 | * RCU torture priority-boost testing. Runs one real-time thread per | |
758 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
759 | * spinning waiting for them to be invoked. If a given callback takes | |
760 | * too long to be invoked, we assume that priority inversion has occurred. | |
761 | */ | |
762 | ||
763 | struct rcu_boost_inflight { | |
764 | struct rcu_head rcu; | |
765 | int inflight; | |
766 | }; | |
767 | ||
768 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
769 | { | |
770 | struct rcu_boost_inflight *rbip = | |
771 | container_of(head, struct rcu_boost_inflight, rcu); | |
772 | ||
6c7ed42c PM |
773 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
774 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
775 | } |
776 | ||
777 | static int rcu_torture_boost(void *arg) | |
778 | { | |
779 | unsigned long call_rcu_time; | |
780 | unsigned long endtime; | |
781 | unsigned long oldstarttime; | |
782 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
783 | struct sched_param sp; | |
784 | ||
5ccf60f2 | 785 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
786 | |
787 | /* Set real-time priority. */ | |
788 | sp.sched_priority = 1; | |
789 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 790 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
791 | n_rcu_torture_boost_rterror++; |
792 | } | |
793 | ||
561190e3 | 794 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
795 | /* Each pass through the following loop does one boost-test cycle. */ |
796 | do { | |
797 | /* Wait for the next test interval. */ | |
798 | oldstarttime = boost_starttime; | |
93898fb1 | 799 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 800 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 801 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 802 | if (torture_must_stop()) |
8e8be45e PM |
803 | goto checkwait; |
804 | } | |
805 | ||
806 | /* Do one boost-test interval. */ | |
807 | endtime = oldstarttime + test_boost_duration * HZ; | |
808 | call_rcu_time = jiffies; | |
93898fb1 | 809 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 810 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
811 | if (!smp_load_acquire(&rbi.inflight)) { |
812 | /* RCU core before ->inflight = 1. */ | |
813 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e PM |
814 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
815 | if (jiffies - call_rcu_time > | |
816 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 817 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
818 | n_rcu_torture_boost_failure++; |
819 | } | |
820 | call_rcu_time = jiffies; | |
821 | } | |
628edaa5 | 822 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 823 | if (torture_must_stop()) |
8e8be45e PM |
824 | goto checkwait; |
825 | } | |
826 | ||
827 | /* | |
828 | * Set the start time of the next test interval. | |
829 | * Yes, this is vulnerable to long delays, but such | |
830 | * delays simply cause a false negative for the next | |
831 | * interval. Besides, we are running at RT priority, | |
832 | * so delays should be relatively rare. | |
833 | */ | |
ab8f11e5 PM |
834 | while (oldstarttime == boost_starttime && |
835 | !kthread_should_stop()) { | |
8e8be45e PM |
836 | if (mutex_trylock(&boost_mutex)) { |
837 | boost_starttime = jiffies + | |
838 | test_boost_interval * HZ; | |
839 | n_rcu_torture_boosts++; | |
840 | mutex_unlock(&boost_mutex); | |
841 | break; | |
842 | } | |
843 | schedule_timeout_uninterruptible(1); | |
844 | } | |
845 | ||
846 | /* Go do the stutter. */ | |
628edaa5 | 847 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 848 | } while (!torture_must_stop()); |
8e8be45e PM |
849 | |
850 | /* Clean up and exit. */ | |
6c7ed42c | 851 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 852 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 853 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 854 | } |
9d68197c | 855 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 856 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
857 | return 0; |
858 | } | |
859 | ||
38706bc5 PM |
860 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
861 | { | |
862 | } | |
863 | ||
864 | /* | |
865 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
866 | * to call_rcu() or analogous, increasing the probability of occurrence | |
867 | * of callback-overflow corner cases. | |
868 | */ | |
869 | static int | |
870 | rcu_torture_cbflood(void *arg) | |
871 | { | |
872 | int err = 1; | |
873 | int i; | |
874 | int j; | |
875 | struct rcu_head *rhp; | |
876 | ||
877 | if (cbflood_n_per_burst > 0 && | |
878 | cbflood_inter_holdoff > 0 && | |
879 | cbflood_intra_holdoff > 0 && | |
880 | cur_ops->call && | |
881 | cur_ops->cb_barrier) { | |
882 | rhp = vmalloc(sizeof(*rhp) * | |
883 | cbflood_n_burst * cbflood_n_per_burst); | |
884 | err = !rhp; | |
885 | } | |
886 | if (err) { | |
887 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 888 | goto wait_for_stop; |
38706bc5 PM |
889 | } |
890 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
891 | do { | |
892 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
893 | atomic_long_inc(&n_cbfloods); | |
894 | WARN_ON(signal_pending(current)); | |
895 | for (i = 0; i < cbflood_n_burst; i++) { | |
896 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
897 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
898 | rcu_torture_cbflood_cb); | |
899 | } | |
900 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
901 | WARN_ON(signal_pending(current)); | |
902 | } | |
903 | cur_ops->cb_barrier(); | |
904 | stutter_wait("rcu_torture_cbflood"); | |
905 | } while (!torture_must_stop()); | |
b8969d1a | 906 | vfree(rhp); |
3a0af333 | 907 | wait_for_stop: |
38706bc5 PM |
908 | torture_kthread_stopping("rcu_torture_cbflood"); |
909 | return 0; | |
910 | } | |
911 | ||
bf66f18e PM |
912 | /* |
913 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
914 | * bursts of calls to force_quiescent_state(), increasing the probability | |
915 | * of occurrence of some important types of race conditions. | |
916 | */ | |
917 | static int | |
918 | rcu_torture_fqs(void *arg) | |
919 | { | |
920 | unsigned long fqs_resume_time; | |
921 | int fqs_burst_remaining; | |
922 | ||
5ccf60f2 | 923 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
924 | do { |
925 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
926 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
927 | !kthread_should_stop()) { | |
bf66f18e PM |
928 | schedule_timeout_interruptible(1); |
929 | } | |
930 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
931 | while (fqs_burst_remaining > 0 && |
932 | !kthread_should_stop()) { | |
bf66f18e PM |
933 | cur_ops->fqs(); |
934 | udelay(fqs_holdoff); | |
935 | fqs_burst_remaining -= fqs_holdoff; | |
936 | } | |
628edaa5 | 937 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 938 | } while (!torture_must_stop()); |
7fafaac5 | 939 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
940 | return 0; |
941 | } | |
942 | ||
a241ec65 PM |
943 | /* |
944 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
945 | * for that pointed to by rcu_torture_current, freeing the old structure | |
946 | * after a series of grace periods (the "pipeline"). | |
947 | */ | |
948 | static int | |
949 | rcu_torture_writer(void *arg) | |
950 | { | |
9efafb88 | 951 | bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal(); |
4bb3c5f4 | 952 | int expediting = 0; |
a48f3fad PM |
953 | unsigned long gp_snap; |
954 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 955 | bool gp_sync1 = gp_sync; |
a241ec65 | 956 | int i; |
a241ec65 PM |
957 | struct rcu_torture *rp; |
958 | struct rcu_torture *old_rp; | |
51b1130e | 959 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
960 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
961 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 962 | int nsynctypes = 0; |
a241ec65 | 963 | |
5ccf60f2 | 964 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
aa5a8988 PM |
965 | if (!can_expedite) { |
966 | pr_alert("%s" TORTURE_FLAG | |
9efafb88 | 967 | " GP expediting controlled from boot/sysfs for %s,\n", |
aa5a8988 PM |
968 | torture_type, cur_ops->name); |
969 | pr_alert("%s" TORTURE_FLAG | |
970 | " Disabled dynamic grace-period expediting.\n", | |
971 | torture_type); | |
972 | } | |
dbdf65b1 | 973 | |
a48f3fad | 974 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 975 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 976 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
a48f3fad PM |
977 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
978 | synctype[nsynctypes++] = RTWS_COND_GET; | |
979 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
980 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
981 | if (gp_exp1 && cur_ops->exp_sync) | |
982 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
983 | else if (gp_exp && !cur_ops->exp_sync) | |
984 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
985 | if (gp_normal1 && cur_ops->deferred_free) | |
986 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
987 | else if (gp_normal && !cur_ops->deferred_free) | |
988 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
989 | if (gp_sync1 && cur_ops->sync) |
990 | synctype[nsynctypes++] = RTWS_SYNC; | |
991 | else if (gp_sync && !cur_ops->sync) | |
992 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
993 | if (WARN_ONCE(nsynctypes == 0, |
994 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
995 | /* |
996 | * No updates primitives, so don't try updating. | |
997 | * The resulting test won't be testing much, hence the | |
998 | * above WARN_ONCE(). | |
999 | */ | |
a48f3fad PM |
1000 | rcu_torture_writer_state = RTWS_STOPPING; |
1001 | torture_kthread_stopping("rcu_torture_writer"); | |
1002 | } | |
1003 | ||
a241ec65 | 1004 | do { |
ad0dc7f9 | 1005 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 1006 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
1007 | rp = rcu_torture_alloc(); |
1008 | if (rp == NULL) | |
a241ec65 PM |
1009 | continue; |
1010 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 1011 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 1012 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 1013 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
1014 | old_rp = rcu_dereference_check(rcu_torture_current, |
1015 | current == writer_task); | |
996417d2 | 1016 | rp->rtort_mbtest = 1; |
a241ec65 | 1017 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 1018 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 1019 | if (old_rp) { |
a241ec65 PM |
1020 | i = old_rp->rtort_pipe_count; |
1021 | if (i > RCU_TORTURE_PIPE_LEN) | |
1022 | i = RCU_TORTURE_PIPE_LEN; | |
1023 | atomic_inc(&rcu_torture_wcount[i]); | |
1024 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
1025 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
1026 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 1027 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 1028 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
1029 | break; |
1030 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 1031 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 1032 | cur_ops->exp_sync(); |
a48f3fad PM |
1033 | rcu_torture_pipe_update(old_rp); |
1034 | break; | |
1035 | case RTWS_COND_GET: | |
1036 | rcu_torture_writer_state = RTWS_COND_GET; | |
1037 | gp_snap = cur_ops->get_state(); | |
1038 | i = torture_random(&rand) % 16; | |
1039 | if (i != 0) | |
1040 | schedule_timeout_interruptible(i); | |
1041 | udelay(torture_random(&rand) % 1000); | |
1042 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
1043 | cur_ops->cond_sync(gp_snap); | |
1044 | rcu_torture_pipe_update(old_rp); | |
1045 | break; | |
f0bf8fab PM |
1046 | case RTWS_SYNC: |
1047 | rcu_torture_writer_state = RTWS_SYNC; | |
1048 | cur_ops->sync(); | |
1049 | rcu_torture_pipe_update(old_rp); | |
1050 | break; | |
a48f3fad PM |
1051 | default: |
1052 | WARN_ON_ONCE(1); | |
1053 | break; | |
2ec1f2d9 | 1054 | } |
a241ec65 | 1055 | } |
4a298656 | 1056 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
1057 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1058 | if (can_expedite && | |
1059 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1060 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1061 | if (expediting >= 0) | |
1062 | rcu_expedite_gp(); | |
1063 | else | |
1064 | rcu_unexpedite_gp(); | |
1065 | if (++expediting > 3) | |
1066 | expediting = -expediting; | |
1067 | } | |
ad0dc7f9 | 1068 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1069 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1070 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1071 | /* Reset expediting back to unexpedited. */ |
1072 | if (expediting > 0) | |
1073 | expediting = -expediting; | |
1074 | while (can_expedite && expediting++ < 0) | |
1075 | rcu_unexpedite_gp(); | |
1076 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 1077 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1078 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1079 | return 0; |
1080 | } | |
1081 | ||
b772e1dd JT |
1082 | /* |
1083 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1084 | * delay between calls. | |
1085 | */ | |
1086 | static int | |
1087 | rcu_torture_fakewriter(void *arg) | |
1088 | { | |
51b1130e | 1089 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1090 | |
5ccf60f2 | 1091 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1092 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1093 | |
1094 | do { | |
51b1130e PM |
1095 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1096 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1097 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1098 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1099 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1100 | } else if (gp_normal == gp_exp) { |
51b1130e | 1101 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1102 | cur_ops->sync(); |
1103 | else | |
1104 | cur_ops->exp_sync(); | |
1105 | } else if (gp_normal) { | |
72472a02 | 1106 | cur_ops->sync(); |
2ec1f2d9 PM |
1107 | } else { |
1108 | cur_ops->exp_sync(); | |
1109 | } | |
628edaa5 | 1110 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1111 | } while (!torture_must_stop()); |
b772e1dd | 1112 | |
7fafaac5 | 1113 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1114 | return 0; |
1115 | } | |
1116 | ||
0729fbf3 PM |
1117 | /* |
1118 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1119 | * incrementing the corresponding element of the pipeline array. The | |
1120 | * counter in the element should never be greater than 1, otherwise, the | |
1121 | * RCU implementation is broken. | |
1122 | */ | |
1123 | static void rcu_torture_timer(unsigned long unused) | |
1124 | { | |
1125 | int idx; | |
917963d0 | 1126 | unsigned long started; |
6b80da42 | 1127 | unsigned long completed; |
51b1130e | 1128 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1129 | static DEFINE_SPINLOCK(rand_lock); |
1130 | struct rcu_torture *p; | |
1131 | int pipe_count; | |
52494535 | 1132 | unsigned long long ts; |
0729fbf3 PM |
1133 | |
1134 | idx = cur_ops->readlock(); | |
917963d0 PM |
1135 | if (cur_ops->started) |
1136 | started = cur_ops->started(); | |
1137 | else | |
1138 | started = cur_ops->completed(); | |
e4aa0da3 | 1139 | ts = rcu_trace_clock_local(); |
632ee200 | 1140 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1141 | rcu_read_lock_bh_held() || |
1142 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1143 | srcu_read_lock_held(srcu_ctlp) || |
1144 | torturing_tasks()); | |
0729fbf3 PM |
1145 | if (p == NULL) { |
1146 | /* Leave because rcu_torture_writer is not yet underway */ | |
1147 | cur_ops->readunlock(idx); | |
1148 | return; | |
1149 | } | |
1150 | if (p->rtort_mbtest == 0) | |
1151 | atomic_inc(&n_rcu_torture_mberror); | |
1152 | spin_lock(&rand_lock); | |
0acc512c | 1153 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1154 | n_rcu_torture_timers++; |
1155 | spin_unlock(&rand_lock); | |
1156 | preempt_disable(); | |
1157 | pipe_count = p->rtort_pipe_count; | |
1158 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1159 | /* Should not happen, but... */ | |
1160 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1161 | } | |
917963d0 | 1162 | completed = cur_ops->completed(); |
52494535 | 1163 | if (pipe_count > 1) { |
52494535 | 1164 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1165 | started, completed); |
274529ba | 1166 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1167 | } |
dd17c8f7 | 1168 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1169 | completed = completed - started; |
1170 | if (cur_ops->started) | |
1171 | completed++; | |
0729fbf3 PM |
1172 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1173 | /* Should not happen, but... */ | |
1174 | completed = RCU_TORTURE_PIPE_LEN; | |
1175 | } | |
dd17c8f7 | 1176 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1177 | preempt_enable(); |
1178 | cur_ops->readunlock(idx); | |
1179 | } | |
1180 | ||
a241ec65 PM |
1181 | /* |
1182 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1183 | * incrementing the corresponding element of the pipeline array. The | |
1184 | * counter in the element should never be greater than 1, otherwise, the | |
1185 | * RCU implementation is broken. | |
1186 | */ | |
1187 | static int | |
1188 | rcu_torture_reader(void *arg) | |
1189 | { | |
917963d0 | 1190 | unsigned long started; |
6b80da42 | 1191 | unsigned long completed; |
72e9bb54 | 1192 | int idx; |
51b1130e | 1193 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1194 | struct rcu_torture *p; |
1195 | int pipe_count; | |
0729fbf3 | 1196 | struct timer_list t; |
52494535 | 1197 | unsigned long long ts; |
a241ec65 | 1198 | |
5ccf60f2 | 1199 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1200 | set_user_nice(current, MAX_NICE); |
0acc512c | 1201 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1202 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1203 | |
a241ec65 | 1204 | do { |
0acc512c | 1205 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1206 | if (!timer_pending(&t)) |
6155fec9 | 1207 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1208 | } |
72e9bb54 | 1209 | idx = cur_ops->readlock(); |
917963d0 PM |
1210 | if (cur_ops->started) |
1211 | started = cur_ops->started(); | |
1212 | else | |
1213 | started = cur_ops->completed(); | |
e4aa0da3 | 1214 | ts = rcu_trace_clock_local(); |
632ee200 | 1215 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1216 | rcu_read_lock_bh_held() || |
1217 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1218 | srcu_read_lock_held(srcu_ctlp) || |
1219 | torturing_tasks()); | |
a241ec65 PM |
1220 | if (p == NULL) { |
1221 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1222 | cur_ops->readunlock(idx); |
a241ec65 PM |
1223 | schedule_timeout_interruptible(HZ); |
1224 | continue; | |
1225 | } | |
996417d2 PM |
1226 | if (p->rtort_mbtest == 0) |
1227 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1228 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1229 | preempt_disable(); |
1230 | pipe_count = p->rtort_pipe_count; | |
1231 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1232 | /* Should not happen, but... */ | |
1233 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1234 | } | |
917963d0 | 1235 | completed = cur_ops->completed(); |
52494535 | 1236 | if (pipe_count > 1) { |
52494535 | 1237 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1238 | ts, started, completed); |
274529ba | 1239 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1240 | } |
dd17c8f7 | 1241 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1242 | completed = completed - started; |
1243 | if (cur_ops->started) | |
1244 | completed++; | |
a241ec65 PM |
1245 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1246 | /* Should not happen, but... */ | |
1247 | completed = RCU_TORTURE_PIPE_LEN; | |
1248 | } | |
dd17c8f7 | 1249 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1250 | preempt_enable(); |
72e9bb54 | 1251 | cur_ops->readunlock(idx); |
628edaa5 | 1252 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1253 | } while (!torture_must_stop()); |
424c1b68 | 1254 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1255 | del_timer_sync(&t); |
424c1b68 TG |
1256 | destroy_timer_on_stack(&t); |
1257 | } | |
7fafaac5 | 1258 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1259 | return 0; |
1260 | } | |
1261 | ||
1262 | /* | |
eea203fe JP |
1263 | * Print torture statistics. Caller must ensure that there is only |
1264 | * one call to this function at a given time!!! This is normally | |
1265 | * accomplished by relying on the module system to only have one copy | |
1266 | * of the module loaded, and then by giving the rcu_torture_stats | |
1267 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1268 | * thread is not running). | |
a241ec65 | 1269 | */ |
d1008950 | 1270 | static void |
eea203fe | 1271 | rcu_torture_stats_print(void) |
a241ec65 | 1272 | { |
a241ec65 PM |
1273 | int cpu; |
1274 | int i; | |
1275 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1276 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1277 | static unsigned long rtcv_snap = ULONG_MAX; |
4ffa6699 | 1278 | struct task_struct *wtp; |
a241ec65 | 1279 | |
0a945022 | 1280 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1281 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1282 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1283 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1284 | } | |
1285 | } | |
1286 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1287 | if (pipesummary[i] != 0) | |
1288 | break; | |
1289 | } | |
eea203fe JP |
1290 | |
1291 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1292 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1293 | rcu_torture_current, | |
1294 | rcu_torture_current_version, | |
1295 | list_empty(&rcu_torture_freelist), | |
1296 | atomic_read(&n_rcu_torture_alloc), | |
1297 | atomic_read(&n_rcu_torture_alloc_fail), | |
1298 | atomic_read(&n_rcu_torture_free)); | |
472213a6 | 1299 | pr_cont("rtmbe: %d rtbe: %ld rtbke: %ld rtbre: %ld ", |
eea203fe | 1300 | atomic_read(&n_rcu_torture_mberror), |
472213a6 | 1301 | n_rcu_torture_barrier_error, |
eea203fe JP |
1302 | n_rcu_torture_boost_ktrerror, |
1303 | n_rcu_torture_boost_rterror); | |
1304 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1305 | n_rcu_torture_boost_failure, | |
1306 | n_rcu_torture_boosts, | |
1307 | n_rcu_torture_timers); | |
1308 | torture_onoff_stats(); | |
38706bc5 | 1309 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1310 | n_barrier_successes, |
1311 | n_barrier_attempts, | |
1312 | n_rcu_torture_barrier_error); | |
38706bc5 | 1313 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1314 | |
1315 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1316 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1317 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1318 | n_rcu_torture_boost_ktrerror != 0 || |
1319 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1320 | n_rcu_torture_boost_failure != 0 || |
1321 | i > 1) { | |
eea203fe | 1322 | pr_cont("%s", "!!! "); |
996417d2 | 1323 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1324 | WARN_ON_ONCE(1); |
996417d2 | 1325 | } |
eea203fe | 1326 | pr_cont("Reader Pipe: "); |
a241ec65 | 1327 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1328 | pr_cont(" %ld", pipesummary[i]); |
1329 | pr_cont("\n"); | |
1330 | ||
1331 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1332 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1333 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1334 | pr_cont(" %ld", batchsummary[i]); |
1335 | pr_cont("\n"); | |
1336 | ||
1337 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1338 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1339 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1340 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1341 | } |
eea203fe JP |
1342 | pr_cont("\n"); |
1343 | ||
c8e5b163 | 1344 | if (cur_ops->stats) |
eea203fe | 1345 | cur_ops->stats(); |
ad0dc7f9 PM |
1346 | if (rtcv_snap == rcu_torture_current_version && |
1347 | rcu_torture_current != NULL) { | |
7f6733c3 PM |
1348 | int __maybe_unused flags = 0; |
1349 | unsigned long __maybe_unused gpnum = 0; | |
1350 | unsigned long __maybe_unused completed = 0; | |
ad0dc7f9 PM |
1351 | |
1352 | rcutorture_get_gp_data(cur_ops->ttype, | |
1353 | &flags, &gpnum, &completed); | |
7f6733c3 PM |
1354 | srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, |
1355 | &flags, &gpnum, &completed); | |
4ffa6699 PM |
1356 | wtp = READ_ONCE(writer_task); |
1357 | pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n", | |
18aff33e | 1358 | rcu_torture_writer_state_getname(), |
eea203fe | 1359 | rcu_torture_writer_state, |
4ffa6699 PM |
1360 | gpnum, completed, flags, |
1361 | wtp == NULL ? ~0UL : wtp->state); | |
afea227f | 1362 | show_rcu_gp_kthreads(); |
274529ba | 1363 | rcu_ftrace_dump(DUMP_ALL); |
ad0dc7f9 PM |
1364 | } |
1365 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1366 | } |
1367 | ||
a241ec65 PM |
1368 | /* |
1369 | * Periodically prints torture statistics, if periodic statistics printing | |
1370 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1371 | */ |
1372 | static int | |
1373 | rcu_torture_stats(void *arg) | |
1374 | { | |
5ccf60f2 | 1375 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1376 | do { |
1377 | schedule_timeout_interruptible(stat_interval * HZ); | |
1378 | rcu_torture_stats_print(); | |
f67a3356 | 1379 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1380 | } while (!torture_must_stop()); |
7fafaac5 | 1381 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1382 | return 0; |
1383 | } | |
1384 | ||
95c38322 | 1385 | static inline void |
e66c33d5 | 1386 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1387 | { |
2caa1e44 PM |
1388 | pr_alert("%s" TORTURE_FLAG |
1389 | "--- %s: nreaders=%d nfakewriters=%d " | |
1390 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1391 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1392 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1393 | "test_boost=%d/%d test_boost_interval=%d " | |
1394 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1395 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1396 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1397 | "onoff_interval=%d onoff_holdoff=%d\n", |
1398 | torture_type, tag, nrealreaders, nfakewriters, | |
1399 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1400 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1401 | test_boost, cur_ops->can_boost, | |
1402 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1403 | stall_cpu, stall_cpu_holdoff, |
1404 | n_barrier_cbs, | |
2caa1e44 | 1405 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1406 | } |
1407 | ||
0ffd374b | 1408 | static int rcutorture_booster_cleanup(unsigned int cpu) |
8e8be45e PM |
1409 | { |
1410 | struct task_struct *t; | |
1411 | ||
1412 | if (boost_tasks[cpu] == NULL) | |
0ffd374b | 1413 | return 0; |
8e8be45e | 1414 | mutex_lock(&boost_mutex); |
8e8be45e PM |
1415 | t = boost_tasks[cpu]; |
1416 | boost_tasks[cpu] = NULL; | |
1417 | mutex_unlock(&boost_mutex); | |
1418 | ||
1419 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1420 | torture_stop_kthread(rcu_torture_boost, t); |
0ffd374b | 1421 | return 0; |
8e8be45e PM |
1422 | } |
1423 | ||
0ffd374b | 1424 | static int rcutorture_booster_init(unsigned int cpu) |
8e8be45e PM |
1425 | { |
1426 | int retval; | |
1427 | ||
1428 | if (boost_tasks[cpu] != NULL) | |
1429 | return 0; /* Already created, nothing more to do. */ | |
1430 | ||
1431 | /* Don't allow time recalculation while creating a new task. */ | |
1432 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1433 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1434 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1435 | cpu_to_node(cpu), | |
1436 | "rcu_torture_boost"); | |
8e8be45e PM |
1437 | if (IS_ERR(boost_tasks[cpu])) { |
1438 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1439 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1440 | n_rcu_torture_boost_ktrerror++; |
1441 | boost_tasks[cpu] = NULL; | |
1442 | mutex_unlock(&boost_mutex); | |
1443 | return retval; | |
1444 | } | |
1445 | kthread_bind(boost_tasks[cpu], cpu); | |
1446 | wake_up_process(boost_tasks[cpu]); | |
1447 | mutex_unlock(&boost_mutex); | |
1448 | return 0; | |
1449 | } | |
1450 | ||
c13f3757 PM |
1451 | /* |
1452 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1453 | * induces a CPU stall for the time specified by stall_cpu. | |
1454 | */ | |
49fb4c62 | 1455 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1456 | { |
1457 | unsigned long stop_at; | |
1458 | ||
5ccf60f2 | 1459 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1460 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1461 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1462 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1463 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1464 | } |
1465 | if (!kthread_should_stop()) { | |
1466 | stop_at = get_seconds() + stall_cpu; | |
1467 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1468 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1469 | rcu_read_lock(); |
1470 | preempt_disable(); | |
1471 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1472 | continue; /* Induce RCU CPU stall warning. */ | |
1473 | preempt_enable(); | |
1474 | rcu_read_unlock(); | |
2caa1e44 | 1475 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1476 | } |
f67a3356 | 1477 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1478 | while (!kthread_should_stop()) |
1479 | schedule_timeout_interruptible(10 * HZ); | |
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1484 | static int __init rcu_torture_stall_init(void) | |
1485 | { | |
c13f3757 PM |
1486 | if (stall_cpu <= 0) |
1487 | return 0; | |
47cf29b9 | 1488 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1489 | } |
1490 | ||
fae4b54f | 1491 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1492 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1493 | { |
1494 | atomic_inc(&barrier_cbs_invoked); | |
1495 | } | |
1496 | ||
1497 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1498 | static int rcu_torture_barrier_cbs(void *arg) | |
1499 | { | |
1500 | long myid = (long)arg; | |
c6ebcbb6 | 1501 | bool lastphase = 0; |
78e4bc34 | 1502 | bool newphase; |
fae4b54f PM |
1503 | struct rcu_head rcu; |
1504 | ||
1505 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1506 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1507 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1508 | do { |
1509 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1510 | (newphase = |
6c7ed42c | 1511 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1512 | torture_must_stop()); |
78e4bc34 | 1513 | lastphase = newphase; |
36970bb9 | 1514 | if (torture_must_stop()) |
fae4b54f | 1515 | break; |
6c7ed42c PM |
1516 | /* |
1517 | * The above smp_load_acquire() ensures barrier_phase load | |
aab05738 | 1518 | * is ordered before the following ->call(). |
6c7ed42c | 1519 | */ |
0aa67e75 | 1520 | local_irq_disable(); /* Just to test no-irq call_rcu(). */ |
fae4b54f | 1521 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
0aa67e75 | 1522 | local_irq_enable(); |
fae4b54f PM |
1523 | if (atomic_dec_and_test(&barrier_cbs_count)) |
1524 | wake_up(&barrier_wq); | |
36970bb9 | 1525 | } while (!torture_must_stop()); |
69c60455 PM |
1526 | if (cur_ops->cb_barrier != NULL) |
1527 | cur_ops->cb_barrier(); | |
fae4b54f | 1528 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1529 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1530 | return 0; |
1531 | } | |
1532 | ||
1533 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1534 | static int rcu_torture_barrier(void *arg) | |
1535 | { | |
1536 | int i; | |
1537 | ||
5ccf60f2 | 1538 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1539 | do { |
1540 | atomic_set(&barrier_cbs_invoked, 0); | |
1541 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1542 | /* Ensure barrier_phase ordered after prior assignments. */ |
1543 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1544 | for (i = 0; i < n_barrier_cbs; i++) |
1545 | wake_up(&barrier_cbs_wq[i]); | |
1546 | wait_event(barrier_wq, | |
1547 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1548 | torture_must_stop()); |
1549 | if (torture_must_stop()) | |
fae4b54f PM |
1550 | break; |
1551 | n_barrier_attempts++; | |
78e4bc34 | 1552 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1553 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1554 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1555 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1556 | atomic_read(&barrier_cbs_invoked), | |
1557 | n_barrier_cbs); | |
fae4b54f PM |
1558 | WARN_ON_ONCE(1); |
1559 | } | |
1560 | n_barrier_successes++; | |
1561 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1562 | } while (!torture_must_stop()); |
7fafaac5 | 1563 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1564 | return 0; |
1565 | } | |
1566 | ||
1567 | /* Initialize RCU barrier testing. */ | |
1568 | static int rcu_torture_barrier_init(void) | |
1569 | { | |
1570 | int i; | |
1571 | int ret; | |
1572 | ||
d9eba768 | 1573 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1574 | return 0; |
1575 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1576 | pr_alert("%s" TORTURE_FLAG |
1577 | " Call or barrier ops missing for %s,\n", | |
1578 | torture_type, cur_ops->name); | |
1579 | pr_alert("%s" TORTURE_FLAG | |
1580 | " RCU barrier testing omitted from run.\n", | |
1581 | torture_type); | |
fae4b54f PM |
1582 | return 0; |
1583 | } | |
1584 | atomic_set(&barrier_cbs_count, 0); | |
1585 | atomic_set(&barrier_cbs_invoked, 0); | |
1586 | barrier_cbs_tasks = | |
1587 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1588 | GFP_KERNEL); | |
1589 | barrier_cbs_wq = | |
1590 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1591 | GFP_KERNEL); | |
de5e6437 | 1592 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1593 | return -ENOMEM; |
1594 | for (i = 0; i < n_barrier_cbs; i++) { | |
1595 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1596 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1597 | (void *)(long)i, | |
1598 | barrier_cbs_tasks[i]); | |
1599 | if (ret) | |
fae4b54f | 1600 | return ret; |
fae4b54f | 1601 | } |
47cf29b9 | 1602 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1603 | } |
1604 | ||
1605 | /* Clean up after RCU barrier testing. */ | |
1606 | static void rcu_torture_barrier_cleanup(void) | |
1607 | { | |
1608 | int i; | |
1609 | ||
9c029b86 | 1610 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1611 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1612 | for (i = 0; i < n_barrier_cbs; i++) |
1613 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1614 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1615 | kfree(barrier_cbs_tasks); |
1616 | barrier_cbs_tasks = NULL; | |
1617 | } | |
1618 | if (barrier_cbs_wq != NULL) { | |
1619 | kfree(barrier_cbs_wq); | |
1620 | barrier_cbs_wq = NULL; | |
1621 | } | |
1622 | } | |
1623 | ||
0ffd374b | 1624 | static enum cpuhp_state rcutor_hp; |
8e8be45e | 1625 | |
a241ec65 PM |
1626 | static void |
1627 | rcu_torture_cleanup(void) | |
1628 | { | |
1629 | int i; | |
1630 | ||
4a298656 | 1631 | rcutorture_record_test_transition(); |
d36a7a0d | 1632 | if (torture_cleanup_begin()) { |
343e9099 PM |
1633 | if (cur_ops->cb_barrier != NULL) |
1634 | cur_ops->cb_barrier(); | |
1635 | return; | |
1636 | } | |
d84f5203 | 1637 | |
fae4b54f | 1638 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1639 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1640 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1641 | |
c8e5b163 | 1642 | if (reader_tasks) { |
9c029b86 PM |
1643 | for (i = 0; i < nrealreaders; i++) |
1644 | torture_stop_kthread(rcu_torture_reader, | |
1645 | reader_tasks[i]); | |
a241ec65 | 1646 | kfree(reader_tasks); |
a241ec65 PM |
1647 | } |
1648 | rcu_torture_current = NULL; | |
1649 | ||
c8e5b163 | 1650 | if (fakewriter_tasks) { |
b772e1dd | 1651 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1652 | torture_stop_kthread(rcu_torture_fakewriter, |
1653 | fakewriter_tasks[i]); | |
b772e1dd JT |
1654 | } |
1655 | kfree(fakewriter_tasks); | |
1656 | fakewriter_tasks = NULL; | |
1657 | } | |
1658 | ||
9c029b86 PM |
1659 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1660 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1661 | for (i = 0; i < ncbflooders; i++) |
1662 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e | 1663 | if ((test_boost == 1 && cur_ops->can_boost) || |
0ffd374b SAS |
1664 | test_boost == 2) |
1665 | cpuhp_remove_state(rcutor_hp); | |
bf66f18e | 1666 | |
ca1d51ed PM |
1667 | /* |
1668 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1669 | * cleanup operations. | |
1670 | */ | |
2326974d PM |
1671 | if (cur_ops->cb_barrier != NULL) |
1672 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
1673 | if (cur_ops->cleanup != NULL) |
1674 | cur_ops->cleanup(); | |
a241ec65 | 1675 | |
a241ec65 | 1676 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1677 | |
fae4b54f | 1678 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1679 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1680 | else if (torture_onoff_failures()) |
091541bb PM |
1681 | rcu_torture_print_module_parms(cur_ops, |
1682 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1683 | else |
8e8be45e | 1684 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1685 | torture_cleanup_end(); |
a241ec65 PM |
1686 | } |
1687 | ||
d2818df1 PM |
1688 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1689 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1690 | { | |
1691 | } | |
1692 | ||
1693 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1694 | { | |
1695 | /* | |
1696 | * This -might- happen due to race conditions, but is unlikely. | |
1697 | * The scenario that leads to this happening is that the | |
1698 | * first of the pair of duplicate callbacks is queued, | |
1699 | * someone else starts a grace period that includes that | |
1700 | * callback, then the second of the pair must wait for the | |
1701 | * next grace period. Unlikely, but can happen. If it | |
1702 | * does happen, the debug-objects subsystem won't have splatted. | |
1703 | */ | |
1704 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1705 | } | |
1706 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1707 | ||
1708 | /* | |
1709 | * Verify that double-free causes debug-objects to complain, but only | |
1710 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1711 | * cannot be carried out. | |
1712 | */ | |
1713 | static void rcu_test_debug_objects(void) | |
1714 | { | |
1715 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1716 | struct rcu_head rh1; | |
1717 | struct rcu_head rh2; | |
1718 | ||
1719 | init_rcu_head_on_stack(&rh1); | |
1720 | init_rcu_head_on_stack(&rh2); | |
1721 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1722 | ||
1723 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1724 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1725 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1726 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1727 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1728 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1729 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1730 | local_irq_enable(); | |
1731 | rcu_read_unlock(); | |
1732 | preempt_enable(); | |
1733 | ||
1734 | /* Wait for them all to get done so we can safely return. */ | |
1735 | rcu_barrier(); | |
1736 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1737 | destroy_rcu_head_on_stack(&rh1); | |
1738 | destroy_rcu_head_on_stack(&rh2); | |
1739 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1740 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1741 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1742 | } | |
1743 | ||
6f8bc500 | 1744 | static int __init |
a241ec65 PM |
1745 | rcu_torture_init(void) |
1746 | { | |
1747 | int i; | |
1748 | int cpu; | |
1749 | int firsterr = 0; | |
2ec1f2d9 | 1750 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed PM |
1751 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
1752 | &sched_ops, RCUTORTURE_TASKS_OPS | |
2ec1f2d9 | 1753 | }; |
a241ec65 | 1754 | |
59da22a0 | 1755 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1756 | return -EBUSY; |
343e9099 | 1757 | |
a241ec65 | 1758 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1759 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1760 | cur_ops = torture_ops[i]; |
ade5fb81 | 1761 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1762 | break; |
72e9bb54 | 1763 | } |
ade5fb81 | 1764 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1765 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1766 | torture_type); | |
1767 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1768 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1769 | pr_alert(" %s", torture_ops[i]->name); |
1770 | pr_alert("\n"); | |
889d487a PM |
1771 | firsterr = -EINVAL; |
1772 | goto unwind; | |
72e9bb54 | 1773 | } |
bf66f18e | 1774 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1775 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1776 | fqs_duration = 0; |
1777 | } | |
c8e5b163 | 1778 | if (cur_ops->init) |
889d487a | 1779 | cur_ops->init(); |
72e9bb54 | 1780 | |
64e4b43a | 1781 | if (nreaders >= 0) { |
a241ec65 | 1782 | nrealreaders = nreaders; |
64e4b43a | 1783 | } else { |
3838cc18 | 1784 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
1785 | if (nrealreaders <= 0) |
1786 | nrealreaders = 1; | |
1787 | } | |
8e8be45e | 1788 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1789 | |
1790 | /* Set up the freelist. */ | |
1791 | ||
1792 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1793 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1794 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1795 | list_add_tail(&rcu_tortures[i].rtort_free, |
1796 | &rcu_torture_freelist); | |
1797 | } | |
1798 | ||
1799 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1800 | ||
1801 | rcu_torture_current = NULL; | |
1802 | rcu_torture_current_version = 0; | |
1803 | atomic_set(&n_rcu_torture_alloc, 0); | |
1804 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1805 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1806 | atomic_set(&n_rcu_torture_mberror, 0); |
1807 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1808 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1809 | n_rcu_torture_boost_ktrerror = 0; |
1810 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1811 | n_rcu_torture_boost_failure = 0; |
1812 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1813 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1814 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1815 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1816 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1817 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1818 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1819 | } | |
1820 | } | |
1821 | ||
1822 | /* Start up the kthreads. */ | |
1823 | ||
47cf29b9 PM |
1824 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1825 | writer_task); | |
1826 | if (firsterr) | |
a241ec65 | 1827 | goto unwind; |
4444d852 PM |
1828 | if (nfakewriters > 0) { |
1829 | fakewriter_tasks = kzalloc(nfakewriters * | |
1830 | sizeof(fakewriter_tasks[0]), | |
1831 | GFP_KERNEL); | |
1832 | if (fakewriter_tasks == NULL) { | |
1833 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1834 | firsterr = -ENOMEM; | |
1835 | goto unwind; | |
1836 | } | |
b772e1dd JT |
1837 | } |
1838 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1839 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1840 | NULL, fakewriter_tasks[i]); | |
1841 | if (firsterr) | |
b772e1dd | 1842 | goto unwind; |
b772e1dd | 1843 | } |
2860aaba | 1844 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1845 | GFP_KERNEL); |
1846 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1847 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1848 | firsterr = -ENOMEM; |
1849 | goto unwind; | |
1850 | } | |
1851 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1852 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1853 | reader_tasks[i]); | |
1854 | if (firsterr) | |
a241ec65 | 1855 | goto unwind; |
a241ec65 PM |
1856 | } |
1857 | if (stat_interval > 0) { | |
47cf29b9 PM |
1858 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1859 | stats_task); | |
1860 | if (firsterr) | |
a241ec65 | 1861 | goto unwind; |
a241ec65 | 1862 | } |
e8e255f7 | 1863 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
1864 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1865 | if (firsterr) | |
d84f5203 | 1866 | goto unwind; |
d84f5203 | 1867 | } |
d120f65f PM |
1868 | if (stutter < 0) |
1869 | stutter = 0; | |
1870 | if (stutter) { | |
628edaa5 PM |
1871 | firsterr = torture_stutter_init(stutter * HZ); |
1872 | if (firsterr) | |
d120f65f | 1873 | goto unwind; |
d120f65f | 1874 | } |
bf66f18e PM |
1875 | if (fqs_duration < 0) |
1876 | fqs_duration = 0; | |
1877 | if (fqs_duration) { | |
628edaa5 | 1878 | /* Create the fqs thread */ |
d0d0606e PM |
1879 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1880 | fqs_task); | |
47cf29b9 | 1881 | if (firsterr) |
bf66f18e | 1882 | goto unwind; |
bf66f18e | 1883 | } |
8e8be45e PM |
1884 | if (test_boost_interval < 1) |
1885 | test_boost_interval = 1; | |
1886 | if (test_boost_duration < 2) | |
1887 | test_boost_duration = 2; | |
1888 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1889 | test_boost == 2) { | |
8e8be45e PM |
1890 | |
1891 | boost_starttime = jiffies + test_boost_interval * HZ; | |
0ffd374b SAS |
1892 | |
1893 | firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE", | |
1894 | rcutorture_booster_init, | |
1895 | rcutorture_booster_cleanup); | |
1896 | if (firsterr < 0) | |
1897 | goto unwind; | |
1898 | rcutor_hp = firsterr; | |
8e8be45e | 1899 | } |
01025ebc PM |
1900 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1901 | if (firsterr) | |
37e377d2 | 1902 | goto unwind; |
01025ebc PM |
1903 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1904 | if (firsterr) | |
37e377d2 | 1905 | goto unwind; |
01025ebc PM |
1906 | firsterr = rcu_torture_stall_init(); |
1907 | if (firsterr) | |
37e377d2 | 1908 | goto unwind; |
01025ebc PM |
1909 | firsterr = rcu_torture_barrier_init(); |
1910 | if (firsterr) | |
fae4b54f | 1911 | goto unwind; |
d2818df1 PM |
1912 | if (object_debug) |
1913 | rcu_test_debug_objects(); | |
38706bc5 PM |
1914 | if (cbflood_n_burst > 0) { |
1915 | /* Create the cbflood threads */ | |
1916 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1917 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1918 | GFP_KERNEL); | |
1919 | if (!cbflood_task) { | |
1920 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1921 | firsterr = -ENOMEM; | |
1922 | goto unwind; | |
1923 | } | |
1924 | for (i = 0; i < ncbflooders; i++) { | |
1925 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1926 | NULL, | |
1927 | cbflood_task[i]); | |
1928 | if (firsterr) | |
1929 | goto unwind; | |
1930 | } | |
1931 | } | |
4a298656 | 1932 | rcutorture_record_test_transition(); |
b5daa8f3 | 1933 | torture_init_end(); |
a241ec65 PM |
1934 | return 0; |
1935 | ||
1936 | unwind: | |
b5daa8f3 | 1937 | torture_init_end(); |
a241ec65 PM |
1938 | rcu_torture_cleanup(); |
1939 | return firsterr; | |
1940 | } | |
1941 | ||
1942 | module_init(rcu_torture_init); | |
1943 | module_exit(rcu_torture_cleanup); |