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a241ec65 | 1 | /* |
29766f1e | 2 | * Read-Copy Update module-based torture test facility |
a241ec65 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
87de1cfd PM |
15 | * along with this program; if not, you can access it online at |
16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
a241ec65 | 17 | * |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
e0198b29 | 21 | * Josh Triplett <josh@joshtriplett.org> |
a241ec65 PM |
22 | * |
23 | * See also: Documentation/RCU/torture.txt | |
24 | */ | |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/smp.h> | |
33 | #include <linux/rcupdate.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/sched.h> | |
60063497 | 36 | #include <linux/atomic.h> |
a241ec65 | 37 | #include <linux/bitops.h> |
a241ec65 PM |
38 | #include <linux/completion.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/notifier.h> | |
343e9099 | 42 | #include <linux/reboot.h> |
83144186 | 43 | #include <linux/freezer.h> |
a241ec65 | 44 | #include <linux/cpu.h> |
a241ec65 | 45 | #include <linux/delay.h> |
a241ec65 | 46 | #include <linux/stat.h> |
b2896d2e | 47 | #include <linux/srcu.h> |
1aeb272c | 48 | #include <linux/slab.h> |
52494535 | 49 | #include <linux/trace_clock.h> |
f07767fd | 50 | #include <asm/byteorder.h> |
51b1130e | 51 | #include <linux/torture.h> |
38706bc5 | 52 | #include <linux/vmalloc.h> |
a241ec65 PM |
53 | |
54 | MODULE_LICENSE("GPL"); | |
e0198b29 | 55 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@joshtriplett.org>"); |
a241ec65 | 56 | |
4102adab | 57 | |
38706bc5 PM |
58 | torture_param(int, cbflood_inter_holdoff, HZ, |
59 | "Holdoff between floods (jiffies)"); | |
60 | torture_param(int, cbflood_intra_holdoff, 1, | |
61 | "Holdoff between bursts (jiffies)"); | |
62 | torture_param(int, cbflood_n_burst, 3, "# bursts in flood, zero to disable"); | |
63 | torture_param(int, cbflood_n_per_burst, 20000, | |
64 | "# callbacks per burst in flood"); | |
9e250225 PM |
65 | torture_param(int, fqs_duration, 0, |
66 | "Duration of fqs bursts (us), 0 to disable"); | |
67 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
68 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
a48f3fad | 69 | torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives"); |
9e250225 PM |
70 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); |
71 | torture_param(bool, gp_normal, false, | |
72 | "Use normal (non-expedited) GP wait primitives"); | |
f0bf8fab | 73 | torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives"); |
9e250225 PM |
74 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); |
75 | torture_param(int, n_barrier_cbs, 0, | |
76 | "# of callbacks/kthreads for barrier testing"); | |
77 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
78 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
79 | torture_param(int, object_debug, 0, | |
80 | "Enable debug-object double call_rcu() testing"); | |
81 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
82 | torture_param(int, onoff_interval, 0, | |
83 | "Time between CPU hotplugs (s), 0=disable"); | |
84 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); | |
85 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
86 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
87 | torture_param(int, stall_cpu_holdoff, 10, | |
88 | "Time to wait before starting stall (s)."); | |
89 | torture_param(int, stat_interval, 60, | |
90 | "Number of seconds between stats printk()s"); | |
91 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
92 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
93 | torture_param(int, test_boost_duration, 4, | |
94 | "Duration of each boost test, seconds."); | |
95 | torture_param(int, test_boost_interval, 7, | |
96 | "Interval between boost tests, seconds."); | |
97 | torture_param(bool, test_no_idle_hz, true, | |
98 | "Test support for tickless idle CPUs"); | |
b5daa8f3 PM |
99 | torture_param(bool, verbose, true, |
100 | "Enable verbose debugging printk()s"); | |
9e250225 | 101 | |
d10453e9 | 102 | static char *torture_type = "rcu"; |
d6ad6711 | 103 | module_param(torture_type, charp, 0444); |
d10453e9 | 104 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
a241ec65 | 105 | |
a241ec65 | 106 | static int nrealreaders; |
38706bc5 | 107 | static int ncbflooders; |
a241ec65 | 108 | static struct task_struct *writer_task; |
b772e1dd | 109 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
110 | static struct task_struct **reader_tasks; |
111 | static struct task_struct *stats_task; | |
38706bc5 | 112 | static struct task_struct **cbflood_task; |
bf66f18e | 113 | static struct task_struct *fqs_task; |
8e8be45e | 114 | static struct task_struct *boost_tasks[NR_CPUS]; |
c13f3757 | 115 | static struct task_struct *stall_task; |
fae4b54f PM |
116 | static struct task_struct **barrier_cbs_tasks; |
117 | static struct task_struct *barrier_task; | |
a241ec65 PM |
118 | |
119 | #define RCU_TORTURE_PIPE_LEN 10 | |
120 | ||
121 | struct rcu_torture { | |
122 | struct rcu_head rtort_rcu; | |
123 | int rtort_pipe_count; | |
124 | struct list_head rtort_free; | |
996417d2 | 125 | int rtort_mbtest; |
a241ec65 PM |
126 | }; |
127 | ||
a241ec65 | 128 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 129 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 130 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
131 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
132 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
67522bee PM |
133 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count); |
134 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch); | |
a241ec65 | 135 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
136 | static atomic_t n_rcu_torture_alloc; |
137 | static atomic_t n_rcu_torture_alloc_fail; | |
138 | static atomic_t n_rcu_torture_free; | |
139 | static atomic_t n_rcu_torture_mberror; | |
140 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 141 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
142 | static long n_rcu_torture_boost_ktrerror; |
143 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
144 | static long n_rcu_torture_boost_failure; |
145 | static long n_rcu_torture_boosts; | |
a71fca58 | 146 | static long n_rcu_torture_timers; |
fae4b54f PM |
147 | static long n_barrier_attempts; |
148 | static long n_barrier_successes; | |
38706bc5 | 149 | static atomic_long_t n_cbfloods; |
e3033736 | 150 | static struct list_head rcu_torture_removed; |
d120f65f | 151 | |
ad0dc7f9 PM |
152 | static int rcu_torture_writer_state; |
153 | #define RTWS_FIXED_DELAY 0 | |
154 | #define RTWS_DELAY 1 | |
155 | #define RTWS_REPLACE 2 | |
156 | #define RTWS_DEF_FREE 3 | |
157 | #define RTWS_EXP_SYNC 4 | |
a48f3fad PM |
158 | #define RTWS_COND_GET 5 |
159 | #define RTWS_COND_SYNC 6 | |
f0bf8fab PM |
160 | #define RTWS_SYNC 7 |
161 | #define RTWS_STUTTER 8 | |
162 | #define RTWS_STOPPING 9 | |
18aff33e PM |
163 | static const char * const rcu_torture_writer_state_names[] = { |
164 | "RTWS_FIXED_DELAY", | |
165 | "RTWS_DELAY", | |
166 | "RTWS_REPLACE", | |
167 | "RTWS_DEF_FREE", | |
168 | "RTWS_EXP_SYNC", | |
169 | "RTWS_COND_GET", | |
170 | "RTWS_COND_SYNC", | |
171 | "RTWS_SYNC", | |
172 | "RTWS_STUTTER", | |
173 | "RTWS_STOPPING", | |
174 | }; | |
175 | ||
176 | static const char *rcu_torture_writer_state_getname(void) | |
177 | { | |
178 | unsigned int i = READ_ONCE(rcu_torture_writer_state); | |
179 | ||
180 | if (i >= ARRAY_SIZE(rcu_torture_writer_state_names)) | |
181 | return "???"; | |
182 | return rcu_torture_writer_state_names[i]; | |
183 | } | |
ad0dc7f9 | 184 | |
4e9a073f | 185 | static int torture_runnable = IS_ENABLED(MODULE); |
59da22a0 PM |
186 | module_param(torture_runnable, int, 0444); |
187 | MODULE_PARM_DESC(torture_runnable, "Start rcutorture at boot"); | |
31a72bce | 188 | |
3acf4a9a | 189 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 190 | #define rcu_can_boost() 1 |
3acf4a9a | 191 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 192 | #define rcu_can_boost() 0 |
3acf4a9a | 193 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 194 | |
e4aa0da3 SR |
195 | #ifdef CONFIG_RCU_TRACE |
196 | static u64 notrace rcu_trace_clock_local(void) | |
197 | { | |
198 | u64 ts = trace_clock_local(); | |
199 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
200 | return ts; | |
201 | } | |
202 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
203 | static u64 notrace rcu_trace_clock_local(void) | |
204 | { | |
205 | return 0ULL; | |
206 | } | |
207 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
208 | ||
8e8be45e | 209 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 210 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 211 | /* and boost task create/destroy. */ |
fae4b54f | 212 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 213 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
214 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
215 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
216 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 217 | |
a241ec65 PM |
218 | /* |
219 | * Allocate an element from the rcu_tortures pool. | |
220 | */ | |
97a41e26 | 221 | static struct rcu_torture * |
a241ec65 PM |
222 | rcu_torture_alloc(void) |
223 | { | |
224 | struct list_head *p; | |
225 | ||
adac1665 | 226 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
227 | if (list_empty(&rcu_torture_freelist)) { |
228 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 229 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
230 | return NULL; |
231 | } | |
232 | atomic_inc(&n_rcu_torture_alloc); | |
233 | p = rcu_torture_freelist.next; | |
234 | list_del_init(p); | |
adac1665 | 235 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
236 | return container_of(p, struct rcu_torture, rtort_free); |
237 | } | |
238 | ||
239 | /* | |
240 | * Free an element to the rcu_tortures pool. | |
241 | */ | |
242 | static void | |
243 | rcu_torture_free(struct rcu_torture *p) | |
244 | { | |
245 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 246 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 247 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 248 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
249 | } |
250 | ||
72e9bb54 PM |
251 | /* |
252 | * Operations vector for selecting different types of tests. | |
253 | */ | |
254 | ||
255 | struct rcu_torture_ops { | |
ad0dc7f9 | 256 | int ttype; |
72e9bb54 | 257 | void (*init)(void); |
ca1d51ed | 258 | void (*cleanup)(void); |
72e9bb54 | 259 | int (*readlock)(void); |
51b1130e | 260 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 261 | void (*readunlock)(int idx); |
917963d0 | 262 | unsigned long (*started)(void); |
6b80da42 | 263 | unsigned long (*completed)(void); |
0acc512c | 264 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 265 | void (*sync)(void); |
2ec1f2d9 | 266 | void (*exp_sync)(void); |
a48f3fad PM |
267 | unsigned long (*get_state)(void); |
268 | void (*cond_sync)(unsigned long oldstate); | |
db3e8db4 | 269 | call_rcu_func_t call; |
2326974d | 270 | void (*cb_barrier)(void); |
bf66f18e | 271 | void (*fqs)(void); |
eea203fe | 272 | void (*stats)(void); |
0acc512c | 273 | int irq_capable; |
8e8be45e | 274 | int can_boost; |
e66c33d5 | 275 | const char *name; |
72e9bb54 | 276 | }; |
a71fca58 PM |
277 | |
278 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
279 | |
280 | /* | |
281 | * Definitions for rcu torture testing. | |
282 | */ | |
283 | ||
a49a4af7 | 284 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
285 | { |
286 | rcu_read_lock(); | |
287 | return 0; | |
288 | } | |
289 | ||
51b1130e | 290 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 291 | { |
d0af39e8 PM |
292 | unsigned long started; |
293 | unsigned long completed; | |
b8d57a76 JT |
294 | const unsigned long shortdelay_us = 200; |
295 | const unsigned long longdelay_ms = 50; | |
d0af39e8 | 296 | unsigned long long ts; |
b2896d2e | 297 | |
b8d57a76 JT |
298 | /* We want a short delay sometimes to make a reader delay the grace |
299 | * period, and we want a long delay occasionally to trigger | |
300 | * force_quiescent_state. */ | |
b2896d2e | 301 | |
d0af39e8 PM |
302 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) { |
303 | started = cur_ops->completed(); | |
304 | ts = rcu_trace_clock_local(); | |
b8d57a76 | 305 | mdelay(longdelay_ms); |
d0af39e8 PM |
306 | completed = cur_ops->completed(); |
307 | do_trace_rcu_torture_read(cur_ops->name, NULL, ts, | |
308 | started, completed); | |
309 | } | |
51b1130e | 310 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 311 | udelay(shortdelay_us); |
e546f485 | 312 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
313 | if (!preempt_count() && |
314 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
315 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
316 | #endif | |
b2896d2e PM |
317 | } |
318 | ||
a49a4af7 | 319 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
320 | { |
321 | rcu_read_unlock(); | |
322 | } | |
323 | ||
a48f3fad PM |
324 | /* |
325 | * Update callback in the pipe. This should be invoked after a grace period. | |
326 | */ | |
327 | static bool | |
328 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
329 | { | |
330 | int i; | |
331 | ||
332 | i = rp->rtort_pipe_count; | |
333 | if (i > RCU_TORTURE_PIPE_LEN) | |
334 | i = RCU_TORTURE_PIPE_LEN; | |
335 | atomic_inc(&rcu_torture_wcount[i]); | |
336 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
337 | rp->rtort_mbtest = 0; | |
338 | return true; | |
339 | } | |
340 | return false; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
345 | * primitives. | |
346 | */ | |
347 | static void | |
348 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
349 | { | |
350 | struct rcu_torture *rp; | |
351 | struct rcu_torture *rp1; | |
352 | ||
353 | if (old_rp) | |
354 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
355 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
356 | if (rcu_torture_pipe_update_one(rp)) { | |
357 | list_del(&rp->rtort_free); | |
358 | rcu_torture_free(rp); | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
72e9bb54 PM |
363 | static void |
364 | rcu_torture_cb(struct rcu_head *p) | |
365 | { | |
72e9bb54 PM |
366 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
367 | ||
36970bb9 | 368 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
369 | /* Test is ending, just drop callbacks on the floor. */ |
370 | /* The next initialization will pick up the pieces. */ | |
371 | return; | |
372 | } | |
a48f3fad | 373 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 374 | rcu_torture_free(rp); |
a48f3fad | 375 | else |
0acc512c | 376 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
377 | } |
378 | ||
6b80da42 | 379 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
380 | { |
381 | return 0; | |
382 | } | |
383 | ||
72e9bb54 PM |
384 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
385 | { | |
386 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
387 | } | |
388 | ||
e3033736 JT |
389 | static void rcu_sync_torture_init(void) |
390 | { | |
391 | INIT_LIST_HEAD(&rcu_torture_removed); | |
392 | } | |
393 | ||
2ec1f2d9 | 394 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 395 | .ttype = RCU_FLAVOR, |
0acc512c | 396 | .init = rcu_sync_torture_init, |
0acc512c PM |
397 | .readlock = rcu_torture_read_lock, |
398 | .read_delay = rcu_read_delay, | |
399 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 400 | .started = rcu_batches_started, |
1e32eaee | 401 | .completed = rcu_batches_completed, |
2ec1f2d9 | 402 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 403 | .sync = synchronize_rcu, |
2ec1f2d9 | 404 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
405 | .get_state = get_state_synchronize_rcu, |
406 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
407 | .call = call_rcu, |
408 | .cb_barrier = rcu_barrier, | |
bf66f18e | 409 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
410 | .stats = NULL, |
411 | .irq_capable = 1, | |
8e8be45e | 412 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 413 | .name = "rcu" |
d9a3da06 PM |
414 | }; |
415 | ||
c32e0660 PM |
416 | /* |
417 | * Definitions for rcu_bh torture testing. | |
418 | */ | |
419 | ||
a49a4af7 | 420 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
421 | { |
422 | rcu_read_lock_bh(); | |
423 | return 0; | |
424 | } | |
425 | ||
a49a4af7 | 426 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
427 | { |
428 | rcu_read_unlock_bh(); | |
429 | } | |
430 | ||
c32e0660 PM |
431 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
432 | { | |
433 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
434 | } | |
435 | ||
436 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 437 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 438 | .init = rcu_sync_torture_init, |
0acc512c PM |
439 | .readlock = rcu_bh_torture_read_lock, |
440 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
441 | .readunlock = rcu_bh_torture_read_unlock, | |
917963d0 | 442 | .started = rcu_batches_started_bh, |
1e32eaee | 443 | .completed = rcu_batches_completed_bh, |
0acc512c | 444 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 445 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 446 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 447 | .call = call_rcu_bh, |
0acc512c | 448 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 449 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
450 | .stats = NULL, |
451 | .irq_capable = 1, | |
452 | .name = "rcu_bh" | |
c32e0660 PM |
453 | }; |
454 | ||
ff20e251 PM |
455 | /* |
456 | * Don't even think about trying any of these in real life!!! | |
457 | * The names includes "busted", and they really means it! | |
458 | * The only purpose of these functions is to provide a buggy RCU | |
459 | * implementation to make sure that rcutorture correctly emits | |
460 | * buggy-RCU error messages. | |
461 | */ | |
462 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
463 | { | |
464 | /* This is a deliberate bug for testing purposes only! */ | |
465 | rcu_torture_cb(&p->rtort_rcu); | |
466 | } | |
467 | ||
468 | static void synchronize_rcu_busted(void) | |
469 | { | |
470 | /* This is a deliberate bug for testing purposes only! */ | |
471 | } | |
472 | ||
473 | static void | |
b6a4ae76 | 474 | call_rcu_busted(struct rcu_head *head, rcu_callback_t func) |
ff20e251 PM |
475 | { |
476 | /* This is a deliberate bug for testing purposes only! */ | |
477 | func(head); | |
478 | } | |
479 | ||
480 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 481 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
482 | .init = rcu_sync_torture_init, |
483 | .readlock = rcu_torture_read_lock, | |
484 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
485 | .readunlock = rcu_torture_read_unlock, | |
917963d0 | 486 | .started = rcu_no_completed, |
ff20e251 PM |
487 | .completed = rcu_no_completed, |
488 | .deferred_free = rcu_busted_torture_deferred_free, | |
489 | .sync = synchronize_rcu_busted, | |
490 | .exp_sync = synchronize_rcu_busted, | |
491 | .call = call_rcu_busted, | |
492 | .cb_barrier = NULL, | |
493 | .fqs = NULL, | |
494 | .stats = NULL, | |
495 | .irq_capable = 1, | |
496 | .name = "rcu_busted" | |
497 | }; | |
498 | ||
b2896d2e PM |
499 | /* |
500 | * Definitions for srcu torture testing. | |
501 | */ | |
502 | ||
cda4dc81 | 503 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
504 | static struct srcu_struct srcu_ctld; |
505 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 506 | |
ca1d51ed | 507 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 508 | { |
ca1d51ed | 509 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
510 | } |
511 | ||
51b1130e | 512 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
513 | { |
514 | long delay; | |
515 | const long uspertick = 1000000 / HZ; | |
516 | const long longdelay = 10; | |
517 | ||
518 | /* We want there to be long-running readers, but not all the time. */ | |
519 | ||
51b1130e PM |
520 | delay = torture_random(rrsp) % |
521 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
522 | if (!delay) |
523 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
524 | else |
525 | rcu_read_delay(rrsp); | |
b2896d2e PM |
526 | } |
527 | ||
ca1d51ed | 528 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 529 | { |
ca1d51ed | 530 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
531 | } |
532 | ||
6b80da42 | 533 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 534 | { |
ca1d51ed | 535 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
536 | } |
537 | ||
9059c940 LJ |
538 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
539 | { | |
ca1d51ed | 540 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
541 | } |
542 | ||
b772e1dd JT |
543 | static void srcu_torture_synchronize(void) |
544 | { | |
ca1d51ed | 545 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
546 | } |
547 | ||
e3f8d378 | 548 | static void srcu_torture_call(struct rcu_head *head, |
b6a4ae76 | 549 | rcu_callback_t func) |
e3f8d378 | 550 | { |
ca1d51ed | 551 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
552 | } |
553 | ||
554 | static void srcu_torture_barrier(void) | |
555 | { | |
ca1d51ed | 556 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
557 | } |
558 | ||
eea203fe | 559 | static void srcu_torture_stats(void) |
b2896d2e | 560 | { |
b2896d2e | 561 | int cpu; |
ca1d51ed | 562 | int idx = srcu_ctlp->completed & 0x1; |
b2896d2e | 563 | |
eea203fe JP |
564 | pr_alert("%s%s per-CPU(idx=%d):", |
565 | torture_type, TORTURE_FLAG, idx); | |
b2896d2e | 566 | for_each_possible_cpu(cpu) { |
589a8f59 PM |
567 | long c0, c1; |
568 | ||
ca1d51ed PM |
569 | c0 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[!idx]; |
570 | c1 = (long)per_cpu_ptr(srcu_ctlp->per_cpu_ref, cpu)->c[idx]; | |
eea203fe | 571 | pr_cont(" %d(%ld,%ld)", cpu, c0, c1); |
b2896d2e | 572 | } |
eea203fe | 573 | pr_cont("\n"); |
b2896d2e PM |
574 | } |
575 | ||
2ec1f2d9 PM |
576 | static void srcu_torture_synchronize_expedited(void) |
577 | { | |
ca1d51ed | 578 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
579 | } |
580 | ||
b2896d2e | 581 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 582 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 583 | .init = rcu_sync_torture_init, |
0acc512c PM |
584 | .readlock = srcu_torture_read_lock, |
585 | .read_delay = srcu_read_delay, | |
586 | .readunlock = srcu_torture_read_unlock, | |
917963d0 | 587 | .started = NULL, |
0acc512c | 588 | .completed = srcu_torture_completed, |
9059c940 | 589 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 590 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 591 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
592 | .call = srcu_torture_call, |
593 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
594 | .stats = srcu_torture_stats, |
595 | .name = "srcu" | |
b2896d2e PM |
596 | }; |
597 | ||
ca1d51ed PM |
598 | static void srcu_torture_init(void) |
599 | { | |
600 | rcu_sync_torture_init(); | |
601 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
602 | srcu_ctlp = &srcu_ctld; | |
603 | } | |
604 | ||
605 | static void srcu_torture_cleanup(void) | |
606 | { | |
607 | cleanup_srcu_struct(&srcu_ctld); | |
608 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ | |
609 | } | |
610 | ||
611 | /* As above, but dynamically allocated. */ | |
612 | static struct rcu_torture_ops srcud_ops = { | |
613 | .ttype = SRCU_FLAVOR, | |
614 | .init = srcu_torture_init, | |
615 | .cleanup = srcu_torture_cleanup, | |
616 | .readlock = srcu_torture_read_lock, | |
617 | .read_delay = srcu_read_delay, | |
618 | .readunlock = srcu_torture_read_unlock, | |
619 | .started = NULL, | |
620 | .completed = srcu_torture_completed, | |
621 | .deferred_free = srcu_torture_deferred_free, | |
622 | .sync = srcu_torture_synchronize, | |
623 | .exp_sync = srcu_torture_synchronize_expedited, | |
624 | .call = srcu_torture_call, | |
625 | .cb_barrier = srcu_torture_barrier, | |
626 | .stats = srcu_torture_stats, | |
627 | .name = "srcud" | |
628 | }; | |
629 | ||
4b6c2cca JT |
630 | /* |
631 | * Definitions for sched torture testing. | |
632 | */ | |
633 | ||
634 | static int sched_torture_read_lock(void) | |
635 | { | |
636 | preempt_disable(); | |
637 | return 0; | |
638 | } | |
639 | ||
640 | static void sched_torture_read_unlock(int idx) | |
641 | { | |
642 | preempt_enable(); | |
643 | } | |
644 | ||
2326974d PM |
645 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
646 | { | |
647 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
648 | } | |
649 | ||
4b6c2cca | 650 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 651 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 652 | .init = rcu_sync_torture_init, |
0acc512c PM |
653 | .readlock = sched_torture_read_lock, |
654 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
655 | .readunlock = sched_torture_read_unlock, | |
917963d0 | 656 | .started = rcu_batches_started_sched, |
1e32eaee | 657 | .completed = rcu_batches_completed_sched, |
0acc512c | 658 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 659 | .sync = synchronize_sched, |
2ec1f2d9 | 660 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
661 | .get_state = get_state_synchronize_sched, |
662 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 663 | .call = call_rcu_sched, |
0acc512c | 664 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 665 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
666 | .stats = NULL, |
667 | .irq_capable = 1, | |
668 | .name = "sched" | |
4b6c2cca JT |
669 | }; |
670 | ||
69c60455 PM |
671 | #ifdef CONFIG_TASKS_RCU |
672 | ||
673 | /* | |
674 | * Definitions for RCU-tasks torture testing. | |
675 | */ | |
676 | ||
677 | static int tasks_torture_read_lock(void) | |
678 | { | |
679 | return 0; | |
680 | } | |
681 | ||
682 | static void tasks_torture_read_unlock(int idx) | |
683 | { | |
684 | } | |
685 | ||
686 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
687 | { | |
688 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
689 | } | |
690 | ||
691 | static struct rcu_torture_ops tasks_ops = { | |
692 | .ttype = RCU_TASKS_FLAVOR, | |
693 | .init = rcu_sync_torture_init, | |
694 | .readlock = tasks_torture_read_lock, | |
695 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
696 | .readunlock = tasks_torture_read_unlock, | |
917963d0 | 697 | .started = rcu_no_completed, |
69c60455 PM |
698 | .completed = rcu_no_completed, |
699 | .deferred_free = rcu_tasks_torture_deferred_free, | |
700 | .sync = synchronize_rcu_tasks, | |
701 | .exp_sync = synchronize_rcu_tasks, | |
702 | .call = call_rcu_tasks, | |
703 | .cb_barrier = rcu_barrier_tasks, | |
704 | .fqs = NULL, | |
705 | .stats = NULL, | |
706 | .irq_capable = 1, | |
707 | .name = "tasks" | |
708 | }; | |
709 | ||
710 | #define RCUTORTURE_TASKS_OPS &tasks_ops, | |
711 | ||
5be5d1a1 PM |
712 | static bool __maybe_unused torturing_tasks(void) |
713 | { | |
714 | return cur_ops == &tasks_ops; | |
715 | } | |
716 | ||
69c60455 PM |
717 | #else /* #ifdef CONFIG_TASKS_RCU */ |
718 | ||
719 | #define RCUTORTURE_TASKS_OPS | |
720 | ||
4f441a25 | 721 | static bool __maybe_unused torturing_tasks(void) |
5be5d1a1 PM |
722 | { |
723 | return false; | |
724 | } | |
725 | ||
69c60455 PM |
726 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ |
727 | ||
8e8be45e PM |
728 | /* |
729 | * RCU torture priority-boost testing. Runs one real-time thread per | |
730 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
731 | * spinning waiting for them to be invoked. If a given callback takes | |
732 | * too long to be invoked, we assume that priority inversion has occurred. | |
733 | */ | |
734 | ||
735 | struct rcu_boost_inflight { | |
736 | struct rcu_head rcu; | |
737 | int inflight; | |
738 | }; | |
739 | ||
740 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
741 | { | |
742 | struct rcu_boost_inflight *rbip = | |
743 | container_of(head, struct rcu_boost_inflight, rcu); | |
744 | ||
6c7ed42c PM |
745 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
746 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
747 | } |
748 | ||
749 | static int rcu_torture_boost(void *arg) | |
750 | { | |
751 | unsigned long call_rcu_time; | |
752 | unsigned long endtime; | |
753 | unsigned long oldstarttime; | |
754 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
755 | struct sched_param sp; | |
756 | ||
5ccf60f2 | 757 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
758 | |
759 | /* Set real-time priority. */ | |
760 | sp.sched_priority = 1; | |
761 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 762 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
763 | n_rcu_torture_boost_rterror++; |
764 | } | |
765 | ||
561190e3 | 766 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
767 | /* Each pass through the following loop does one boost-test cycle. */ |
768 | do { | |
769 | /* Wait for the next test interval. */ | |
770 | oldstarttime = boost_starttime; | |
93898fb1 | 771 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 772 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 773 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 774 | if (torture_must_stop()) |
8e8be45e PM |
775 | goto checkwait; |
776 | } | |
777 | ||
778 | /* Do one boost-test interval. */ | |
779 | endtime = oldstarttime + test_boost_duration * HZ; | |
780 | call_rcu_time = jiffies; | |
93898fb1 | 781 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 782 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
783 | if (!smp_load_acquire(&rbi.inflight)) { |
784 | /* RCU core before ->inflight = 1. */ | |
785 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e PM |
786 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
787 | if (jiffies - call_rcu_time > | |
788 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 789 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
790 | n_rcu_torture_boost_failure++; |
791 | } | |
792 | call_rcu_time = jiffies; | |
793 | } | |
628edaa5 | 794 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 795 | if (torture_must_stop()) |
8e8be45e PM |
796 | goto checkwait; |
797 | } | |
798 | ||
799 | /* | |
800 | * Set the start time of the next test interval. | |
801 | * Yes, this is vulnerable to long delays, but such | |
802 | * delays simply cause a false negative for the next | |
803 | * interval. Besides, we are running at RT priority, | |
804 | * so delays should be relatively rare. | |
805 | */ | |
ab8f11e5 PM |
806 | while (oldstarttime == boost_starttime && |
807 | !kthread_should_stop()) { | |
8e8be45e PM |
808 | if (mutex_trylock(&boost_mutex)) { |
809 | boost_starttime = jiffies + | |
810 | test_boost_interval * HZ; | |
811 | n_rcu_torture_boosts++; | |
812 | mutex_unlock(&boost_mutex); | |
813 | break; | |
814 | } | |
815 | schedule_timeout_uninterruptible(1); | |
816 | } | |
817 | ||
818 | /* Go do the stutter. */ | |
628edaa5 | 819 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 820 | } while (!torture_must_stop()); |
8e8be45e PM |
821 | |
822 | /* Clean up and exit. */ | |
6c7ed42c | 823 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 824 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 825 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 826 | } |
9d68197c | 827 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 828 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
829 | return 0; |
830 | } | |
831 | ||
38706bc5 PM |
832 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
833 | { | |
834 | } | |
835 | ||
836 | /* | |
837 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
838 | * to call_rcu() or analogous, increasing the probability of occurrence | |
839 | * of callback-overflow corner cases. | |
840 | */ | |
841 | static int | |
842 | rcu_torture_cbflood(void *arg) | |
843 | { | |
844 | int err = 1; | |
845 | int i; | |
846 | int j; | |
847 | struct rcu_head *rhp; | |
848 | ||
849 | if (cbflood_n_per_burst > 0 && | |
850 | cbflood_inter_holdoff > 0 && | |
851 | cbflood_intra_holdoff > 0 && | |
852 | cur_ops->call && | |
853 | cur_ops->cb_barrier) { | |
854 | rhp = vmalloc(sizeof(*rhp) * | |
855 | cbflood_n_burst * cbflood_n_per_burst); | |
856 | err = !rhp; | |
857 | } | |
858 | if (err) { | |
859 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 860 | goto wait_for_stop; |
38706bc5 PM |
861 | } |
862 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
863 | do { | |
864 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
865 | atomic_long_inc(&n_cbfloods); | |
866 | WARN_ON(signal_pending(current)); | |
867 | for (i = 0; i < cbflood_n_burst; i++) { | |
868 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
869 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
870 | rcu_torture_cbflood_cb); | |
871 | } | |
872 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
873 | WARN_ON(signal_pending(current)); | |
874 | } | |
875 | cur_ops->cb_barrier(); | |
876 | stutter_wait("rcu_torture_cbflood"); | |
877 | } while (!torture_must_stop()); | |
b8969d1a | 878 | vfree(rhp); |
3a0af333 | 879 | wait_for_stop: |
38706bc5 PM |
880 | torture_kthread_stopping("rcu_torture_cbflood"); |
881 | return 0; | |
882 | } | |
883 | ||
bf66f18e PM |
884 | /* |
885 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
886 | * bursts of calls to force_quiescent_state(), increasing the probability | |
887 | * of occurrence of some important types of race conditions. | |
888 | */ | |
889 | static int | |
890 | rcu_torture_fqs(void *arg) | |
891 | { | |
892 | unsigned long fqs_resume_time; | |
893 | int fqs_burst_remaining; | |
894 | ||
5ccf60f2 | 895 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
896 | do { |
897 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
898 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
899 | !kthread_should_stop()) { | |
bf66f18e PM |
900 | schedule_timeout_interruptible(1); |
901 | } | |
902 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
903 | while (fqs_burst_remaining > 0 && |
904 | !kthread_should_stop()) { | |
bf66f18e PM |
905 | cur_ops->fqs(); |
906 | udelay(fqs_holdoff); | |
907 | fqs_burst_remaining -= fqs_holdoff; | |
908 | } | |
628edaa5 | 909 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 910 | } while (!torture_must_stop()); |
7fafaac5 | 911 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
912 | return 0; |
913 | } | |
914 | ||
a241ec65 PM |
915 | /* |
916 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
917 | * for that pointed to by rcu_torture_current, freeing the old structure | |
918 | * after a series of grace periods (the "pipeline"). | |
919 | */ | |
920 | static int | |
921 | rcu_torture_writer(void *arg) | |
922 | { | |
9efafb88 | 923 | bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal(); |
4bb3c5f4 | 924 | int expediting = 0; |
a48f3fad PM |
925 | unsigned long gp_snap; |
926 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 927 | bool gp_sync1 = gp_sync; |
a241ec65 | 928 | int i; |
a241ec65 PM |
929 | struct rcu_torture *rp; |
930 | struct rcu_torture *old_rp; | |
51b1130e | 931 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
932 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
933 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 934 | int nsynctypes = 0; |
a241ec65 | 935 | |
5ccf60f2 | 936 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
aa5a8988 PM |
937 | if (!can_expedite) { |
938 | pr_alert("%s" TORTURE_FLAG | |
9efafb88 | 939 | " GP expediting controlled from boot/sysfs for %s,\n", |
aa5a8988 PM |
940 | torture_type, cur_ops->name); |
941 | pr_alert("%s" TORTURE_FLAG | |
942 | " Disabled dynamic grace-period expediting.\n", | |
943 | torture_type); | |
944 | } | |
dbdf65b1 | 945 | |
a48f3fad | 946 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 947 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 948 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
a48f3fad PM |
949 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) |
950 | synctype[nsynctypes++] = RTWS_COND_GET; | |
951 | else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) | |
952 | pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); | |
953 | if (gp_exp1 && cur_ops->exp_sync) | |
954 | synctype[nsynctypes++] = RTWS_EXP_SYNC; | |
955 | else if (gp_exp && !cur_ops->exp_sync) | |
956 | pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); | |
957 | if (gp_normal1 && cur_ops->deferred_free) | |
958 | synctype[nsynctypes++] = RTWS_DEF_FREE; | |
959 | else if (gp_normal && !cur_ops->deferred_free) | |
960 | pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); | |
f0bf8fab PM |
961 | if (gp_sync1 && cur_ops->sync) |
962 | synctype[nsynctypes++] = RTWS_SYNC; | |
963 | else if (gp_sync && !cur_ops->sync) | |
964 | pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); | |
a48f3fad PM |
965 | if (WARN_ONCE(nsynctypes == 0, |
966 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
967 | /* |
968 | * No updates primitives, so don't try updating. | |
969 | * The resulting test won't be testing much, hence the | |
970 | * above WARN_ONCE(). | |
971 | */ | |
a48f3fad PM |
972 | rcu_torture_writer_state = RTWS_STOPPING; |
973 | torture_kthread_stopping("rcu_torture_writer"); | |
974 | } | |
975 | ||
a241ec65 | 976 | do { |
ad0dc7f9 | 977 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 978 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
979 | rp = rcu_torture_alloc(); |
980 | if (rp == NULL) | |
a241ec65 PM |
981 | continue; |
982 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 983 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 984 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 985 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
986 | old_rp = rcu_dereference_check(rcu_torture_current, |
987 | current == writer_task); | |
996417d2 | 988 | rp->rtort_mbtest = 1; |
a241ec65 | 989 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 990 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 991 | if (old_rp) { |
a241ec65 PM |
992 | i = old_rp->rtort_pipe_count; |
993 | if (i > RCU_TORTURE_PIPE_LEN) | |
994 | i = RCU_TORTURE_PIPE_LEN; | |
995 | atomic_inc(&rcu_torture_wcount[i]); | |
996 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
997 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
998 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 999 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 1000 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
1001 | break; |
1002 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 1003 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 1004 | cur_ops->exp_sync(); |
a48f3fad PM |
1005 | rcu_torture_pipe_update(old_rp); |
1006 | break; | |
1007 | case RTWS_COND_GET: | |
1008 | rcu_torture_writer_state = RTWS_COND_GET; | |
1009 | gp_snap = cur_ops->get_state(); | |
1010 | i = torture_random(&rand) % 16; | |
1011 | if (i != 0) | |
1012 | schedule_timeout_interruptible(i); | |
1013 | udelay(torture_random(&rand) % 1000); | |
1014 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
1015 | cur_ops->cond_sync(gp_snap); | |
1016 | rcu_torture_pipe_update(old_rp); | |
1017 | break; | |
f0bf8fab PM |
1018 | case RTWS_SYNC: |
1019 | rcu_torture_writer_state = RTWS_SYNC; | |
1020 | cur_ops->sync(); | |
1021 | rcu_torture_pipe_update(old_rp); | |
1022 | break; | |
a48f3fad PM |
1023 | default: |
1024 | WARN_ON_ONCE(1); | |
1025 | break; | |
2ec1f2d9 | 1026 | } |
a241ec65 | 1027 | } |
4a298656 | 1028 | rcutorture_record_progress(++rcu_torture_current_version); |
4bb3c5f4 PM |
1029 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1030 | if (can_expedite && | |
1031 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1032 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1033 | if (expediting >= 0) | |
1034 | rcu_expedite_gp(); | |
1035 | else | |
1036 | rcu_unexpedite_gp(); | |
1037 | if (++expediting > 3) | |
1038 | expediting = -expediting; | |
1039 | } | |
ad0dc7f9 | 1040 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1041 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1042 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1043 | /* Reset expediting back to unexpedited. */ |
1044 | if (expediting > 0) | |
1045 | expediting = -expediting; | |
1046 | while (can_expedite && expediting++ < 0) | |
1047 | rcu_unexpedite_gp(); | |
1048 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
ad0dc7f9 | 1049 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1050 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1051 | return 0; |
1052 | } | |
1053 | ||
b772e1dd JT |
1054 | /* |
1055 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1056 | * delay between calls. | |
1057 | */ | |
1058 | static int | |
1059 | rcu_torture_fakewriter(void *arg) | |
1060 | { | |
51b1130e | 1061 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1062 | |
5ccf60f2 | 1063 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1064 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1065 | |
1066 | do { | |
51b1130e PM |
1067 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1068 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1069 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1070 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1071 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1072 | } else if (gp_normal == gp_exp) { |
51b1130e | 1073 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
1074 | cur_ops->sync(); |
1075 | else | |
1076 | cur_ops->exp_sync(); | |
1077 | } else if (gp_normal) { | |
72472a02 | 1078 | cur_ops->sync(); |
2ec1f2d9 PM |
1079 | } else { |
1080 | cur_ops->exp_sync(); | |
1081 | } | |
628edaa5 | 1082 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1083 | } while (!torture_must_stop()); |
b772e1dd | 1084 | |
7fafaac5 | 1085 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1086 | return 0; |
1087 | } | |
1088 | ||
0729fbf3 PM |
1089 | /* |
1090 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1091 | * incrementing the corresponding element of the pipeline array. The | |
1092 | * counter in the element should never be greater than 1, otherwise, the | |
1093 | * RCU implementation is broken. | |
1094 | */ | |
1095 | static void rcu_torture_timer(unsigned long unused) | |
1096 | { | |
1097 | int idx; | |
917963d0 | 1098 | unsigned long started; |
6b80da42 | 1099 | unsigned long completed; |
51b1130e | 1100 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
1101 | static DEFINE_SPINLOCK(rand_lock); |
1102 | struct rcu_torture *p; | |
1103 | int pipe_count; | |
52494535 | 1104 | unsigned long long ts; |
0729fbf3 PM |
1105 | |
1106 | idx = cur_ops->readlock(); | |
917963d0 PM |
1107 | if (cur_ops->started) |
1108 | started = cur_ops->started(); | |
1109 | else | |
1110 | started = cur_ops->completed(); | |
e4aa0da3 | 1111 | ts = rcu_trace_clock_local(); |
632ee200 | 1112 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1113 | rcu_read_lock_bh_held() || |
1114 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1115 | srcu_read_lock_held(srcu_ctlp) || |
1116 | torturing_tasks()); | |
0729fbf3 PM |
1117 | if (p == NULL) { |
1118 | /* Leave because rcu_torture_writer is not yet underway */ | |
1119 | cur_ops->readunlock(idx); | |
1120 | return; | |
1121 | } | |
1122 | if (p->rtort_mbtest == 0) | |
1123 | atomic_inc(&n_rcu_torture_mberror); | |
1124 | spin_lock(&rand_lock); | |
0acc512c | 1125 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1126 | n_rcu_torture_timers++; |
1127 | spin_unlock(&rand_lock); | |
1128 | preempt_disable(); | |
1129 | pipe_count = p->rtort_pipe_count; | |
1130 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1131 | /* Should not happen, but... */ | |
1132 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1133 | } | |
917963d0 | 1134 | completed = cur_ops->completed(); |
52494535 | 1135 | if (pipe_count > 1) { |
52494535 | 1136 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
917963d0 | 1137 | started, completed); |
274529ba | 1138 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1139 | } |
dd17c8f7 | 1140 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1141 | completed = completed - started; |
1142 | if (cur_ops->started) | |
1143 | completed++; | |
0729fbf3 PM |
1144 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1145 | /* Should not happen, but... */ | |
1146 | completed = RCU_TORTURE_PIPE_LEN; | |
1147 | } | |
dd17c8f7 | 1148 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1149 | preempt_enable(); |
1150 | cur_ops->readunlock(idx); | |
1151 | } | |
1152 | ||
a241ec65 PM |
1153 | /* |
1154 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1155 | * incrementing the corresponding element of the pipeline array. The | |
1156 | * counter in the element should never be greater than 1, otherwise, the | |
1157 | * RCU implementation is broken. | |
1158 | */ | |
1159 | static int | |
1160 | rcu_torture_reader(void *arg) | |
1161 | { | |
917963d0 | 1162 | unsigned long started; |
6b80da42 | 1163 | unsigned long completed; |
72e9bb54 | 1164 | int idx; |
51b1130e | 1165 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
1166 | struct rcu_torture *p; |
1167 | int pipe_count; | |
0729fbf3 | 1168 | struct timer_list t; |
52494535 | 1169 | unsigned long long ts; |
a241ec65 | 1170 | |
5ccf60f2 | 1171 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1172 | set_user_nice(current, MAX_NICE); |
0acc512c | 1173 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1174 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1175 | |
a241ec65 | 1176 | do { |
0acc512c | 1177 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1178 | if (!timer_pending(&t)) |
6155fec9 | 1179 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1180 | } |
72e9bb54 | 1181 | idx = cur_ops->readlock(); |
917963d0 PM |
1182 | if (cur_ops->started) |
1183 | started = cur_ops->started(); | |
1184 | else | |
1185 | started = cur_ops->completed(); | |
e4aa0da3 | 1186 | ts = rcu_trace_clock_local(); |
632ee200 | 1187 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1188 | rcu_read_lock_bh_held() || |
1189 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1190 | srcu_read_lock_held(srcu_ctlp) || |
1191 | torturing_tasks()); | |
a241ec65 PM |
1192 | if (p == NULL) { |
1193 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1194 | cur_ops->readunlock(idx); |
a241ec65 PM |
1195 | schedule_timeout_interruptible(HZ); |
1196 | continue; | |
1197 | } | |
996417d2 PM |
1198 | if (p->rtort_mbtest == 0) |
1199 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1200 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1201 | preempt_disable(); |
1202 | pipe_count = p->rtort_pipe_count; | |
1203 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1204 | /* Should not happen, but... */ | |
1205 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1206 | } | |
917963d0 | 1207 | completed = cur_ops->completed(); |
52494535 | 1208 | if (pipe_count > 1) { |
52494535 | 1209 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
917963d0 | 1210 | ts, started, completed); |
274529ba | 1211 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1212 | } |
dd17c8f7 | 1213 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
917963d0 PM |
1214 | completed = completed - started; |
1215 | if (cur_ops->started) | |
1216 | completed++; | |
a241ec65 PM |
1217 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1218 | /* Should not happen, but... */ | |
1219 | completed = RCU_TORTURE_PIPE_LEN; | |
1220 | } | |
dd17c8f7 | 1221 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1222 | preempt_enable(); |
72e9bb54 | 1223 | cur_ops->readunlock(idx); |
628edaa5 | 1224 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1225 | } while (!torture_must_stop()); |
424c1b68 | 1226 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1227 | del_timer_sync(&t); |
424c1b68 TG |
1228 | destroy_timer_on_stack(&t); |
1229 | } | |
7fafaac5 | 1230 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1231 | return 0; |
1232 | } | |
1233 | ||
1234 | /* | |
eea203fe JP |
1235 | * Print torture statistics. Caller must ensure that there is only |
1236 | * one call to this function at a given time!!! This is normally | |
1237 | * accomplished by relying on the module system to only have one copy | |
1238 | * of the module loaded, and then by giving the rcu_torture_stats | |
1239 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1240 | * thread is not running). | |
a241ec65 | 1241 | */ |
d1008950 | 1242 | static void |
eea203fe | 1243 | rcu_torture_stats_print(void) |
a241ec65 | 1244 | { |
a241ec65 PM |
1245 | int cpu; |
1246 | int i; | |
1247 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1248 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1249 | static unsigned long rtcv_snap = ULONG_MAX; |
4ffa6699 | 1250 | struct task_struct *wtp; |
a241ec65 | 1251 | |
0a945022 | 1252 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1253 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1254 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1255 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1256 | } | |
1257 | } | |
1258 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1259 | if (pipesummary[i] != 0) | |
1260 | break; | |
1261 | } | |
eea203fe JP |
1262 | |
1263 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1264 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1265 | rcu_torture_current, | |
1266 | rcu_torture_current_version, | |
1267 | list_empty(&rcu_torture_freelist), | |
1268 | atomic_read(&n_rcu_torture_alloc), | |
1269 | atomic_read(&n_rcu_torture_alloc_fail), | |
1270 | atomic_read(&n_rcu_torture_free)); | |
472213a6 | 1271 | pr_cont("rtmbe: %d rtbe: %ld rtbke: %ld rtbre: %ld ", |
eea203fe | 1272 | atomic_read(&n_rcu_torture_mberror), |
472213a6 | 1273 | n_rcu_torture_barrier_error, |
eea203fe JP |
1274 | n_rcu_torture_boost_ktrerror, |
1275 | n_rcu_torture_boost_rterror); | |
1276 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1277 | n_rcu_torture_boost_failure, | |
1278 | n_rcu_torture_boosts, | |
1279 | n_rcu_torture_timers); | |
1280 | torture_onoff_stats(); | |
38706bc5 | 1281 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1282 | n_barrier_successes, |
1283 | n_barrier_attempts, | |
1284 | n_rcu_torture_barrier_error); | |
38706bc5 | 1285 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1286 | |
1287 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1288 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1289 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1290 | n_rcu_torture_boost_ktrerror != 0 || |
1291 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1292 | n_rcu_torture_boost_failure != 0 || |
1293 | i > 1) { | |
eea203fe | 1294 | pr_cont("%s", "!!! "); |
996417d2 | 1295 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1296 | WARN_ON_ONCE(1); |
996417d2 | 1297 | } |
eea203fe | 1298 | pr_cont("Reader Pipe: "); |
a241ec65 | 1299 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1300 | pr_cont(" %ld", pipesummary[i]); |
1301 | pr_cont("\n"); | |
1302 | ||
1303 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1304 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1305 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1306 | pr_cont(" %ld", batchsummary[i]); |
1307 | pr_cont("\n"); | |
1308 | ||
1309 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1310 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1311 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1312 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1313 | } |
eea203fe JP |
1314 | pr_cont("\n"); |
1315 | ||
c8e5b163 | 1316 | if (cur_ops->stats) |
eea203fe | 1317 | cur_ops->stats(); |
ad0dc7f9 PM |
1318 | if (rtcv_snap == rcu_torture_current_version && |
1319 | rcu_torture_current != NULL) { | |
1320 | int __maybe_unused flags; | |
1321 | unsigned long __maybe_unused gpnum; | |
1322 | unsigned long __maybe_unused completed; | |
1323 | ||
1324 | rcutorture_get_gp_data(cur_ops->ttype, | |
1325 | &flags, &gpnum, &completed); | |
4ffa6699 PM |
1326 | wtp = READ_ONCE(writer_task); |
1327 | pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n", | |
18aff33e | 1328 | rcu_torture_writer_state_getname(), |
eea203fe | 1329 | rcu_torture_writer_state, |
4ffa6699 PM |
1330 | gpnum, completed, flags, |
1331 | wtp == NULL ? ~0UL : wtp->state); | |
afea227f | 1332 | show_rcu_gp_kthreads(); |
274529ba | 1333 | rcu_ftrace_dump(DUMP_ALL); |
ad0dc7f9 PM |
1334 | } |
1335 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1336 | } |
1337 | ||
a241ec65 PM |
1338 | /* |
1339 | * Periodically prints torture statistics, if periodic statistics printing | |
1340 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1341 | */ |
1342 | static int | |
1343 | rcu_torture_stats(void *arg) | |
1344 | { | |
5ccf60f2 | 1345 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1346 | do { |
1347 | schedule_timeout_interruptible(stat_interval * HZ); | |
1348 | rcu_torture_stats_print(); | |
f67a3356 | 1349 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1350 | } while (!torture_must_stop()); |
7fafaac5 | 1351 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1352 | return 0; |
1353 | } | |
1354 | ||
95c38322 | 1355 | static inline void |
e66c33d5 | 1356 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1357 | { |
2caa1e44 PM |
1358 | pr_alert("%s" TORTURE_FLAG |
1359 | "--- %s: nreaders=%d nfakewriters=%d " | |
1360 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1361 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1362 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1363 | "test_boost=%d/%d test_boost_interval=%d " | |
1364 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1365 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1366 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1367 | "onoff_interval=%d onoff_holdoff=%d\n", |
1368 | torture_type, tag, nrealreaders, nfakewriters, | |
1369 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1370 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1371 | test_boost, cur_ops->can_boost, | |
1372 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1373 | stall_cpu, stall_cpu_holdoff, |
1374 | n_barrier_cbs, | |
2caa1e44 | 1375 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1376 | } |
1377 | ||
0ffd374b | 1378 | static int rcutorture_booster_cleanup(unsigned int cpu) |
8e8be45e PM |
1379 | { |
1380 | struct task_struct *t; | |
1381 | ||
1382 | if (boost_tasks[cpu] == NULL) | |
0ffd374b | 1383 | return 0; |
8e8be45e | 1384 | mutex_lock(&boost_mutex); |
8e8be45e PM |
1385 | t = boost_tasks[cpu]; |
1386 | boost_tasks[cpu] = NULL; | |
1387 | mutex_unlock(&boost_mutex); | |
1388 | ||
1389 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1390 | torture_stop_kthread(rcu_torture_boost, t); |
0ffd374b | 1391 | return 0; |
8e8be45e PM |
1392 | } |
1393 | ||
0ffd374b | 1394 | static int rcutorture_booster_init(unsigned int cpu) |
8e8be45e PM |
1395 | { |
1396 | int retval; | |
1397 | ||
1398 | if (boost_tasks[cpu] != NULL) | |
1399 | return 0; /* Already created, nothing more to do. */ | |
1400 | ||
1401 | /* Don't allow time recalculation while creating a new task. */ | |
1402 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1403 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1404 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1405 | cpu_to_node(cpu), | |
1406 | "rcu_torture_boost"); | |
8e8be45e PM |
1407 | if (IS_ERR(boost_tasks[cpu])) { |
1408 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1409 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1410 | n_rcu_torture_boost_ktrerror++; |
1411 | boost_tasks[cpu] = NULL; | |
1412 | mutex_unlock(&boost_mutex); | |
1413 | return retval; | |
1414 | } | |
1415 | kthread_bind(boost_tasks[cpu], cpu); | |
1416 | wake_up_process(boost_tasks[cpu]); | |
1417 | mutex_unlock(&boost_mutex); | |
1418 | return 0; | |
1419 | } | |
1420 | ||
c13f3757 PM |
1421 | /* |
1422 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1423 | * induces a CPU stall for the time specified by stall_cpu. | |
1424 | */ | |
49fb4c62 | 1425 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1426 | { |
1427 | unsigned long stop_at; | |
1428 | ||
5ccf60f2 | 1429 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1430 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1431 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1432 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1433 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1434 | } |
1435 | if (!kthread_should_stop()) { | |
1436 | stop_at = get_seconds() + stall_cpu; | |
1437 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1438 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1439 | rcu_read_lock(); |
1440 | preempt_disable(); | |
1441 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1442 | continue; /* Induce RCU CPU stall warning. */ | |
1443 | preempt_enable(); | |
1444 | rcu_read_unlock(); | |
2caa1e44 | 1445 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1446 | } |
f67a3356 | 1447 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1448 | while (!kthread_should_stop()) |
1449 | schedule_timeout_interruptible(10 * HZ); | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1454 | static int __init rcu_torture_stall_init(void) | |
1455 | { | |
c13f3757 PM |
1456 | if (stall_cpu <= 0) |
1457 | return 0; | |
47cf29b9 | 1458 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1459 | } |
1460 | ||
fae4b54f | 1461 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1462 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1463 | { |
1464 | atomic_inc(&barrier_cbs_invoked); | |
1465 | } | |
1466 | ||
1467 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1468 | static int rcu_torture_barrier_cbs(void *arg) | |
1469 | { | |
1470 | long myid = (long)arg; | |
c6ebcbb6 | 1471 | bool lastphase = 0; |
78e4bc34 | 1472 | bool newphase; |
fae4b54f PM |
1473 | struct rcu_head rcu; |
1474 | ||
1475 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1476 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1477 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1478 | do { |
1479 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1480 | (newphase = |
6c7ed42c | 1481 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1482 | torture_must_stop()); |
78e4bc34 | 1483 | lastphase = newphase; |
36970bb9 | 1484 | if (torture_must_stop()) |
fae4b54f | 1485 | break; |
6c7ed42c PM |
1486 | /* |
1487 | * The above smp_load_acquire() ensures barrier_phase load | |
aab05738 | 1488 | * is ordered before the following ->call(). |
6c7ed42c | 1489 | */ |
0aa67e75 | 1490 | local_irq_disable(); /* Just to test no-irq call_rcu(). */ |
fae4b54f | 1491 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
0aa67e75 | 1492 | local_irq_enable(); |
fae4b54f PM |
1493 | if (atomic_dec_and_test(&barrier_cbs_count)) |
1494 | wake_up(&barrier_wq); | |
36970bb9 | 1495 | } while (!torture_must_stop()); |
69c60455 PM |
1496 | if (cur_ops->cb_barrier != NULL) |
1497 | cur_ops->cb_barrier(); | |
fae4b54f | 1498 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1499 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1500 | return 0; |
1501 | } | |
1502 | ||
1503 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1504 | static int rcu_torture_barrier(void *arg) | |
1505 | { | |
1506 | int i; | |
1507 | ||
5ccf60f2 | 1508 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1509 | do { |
1510 | atomic_set(&barrier_cbs_invoked, 0); | |
1511 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1512 | /* Ensure barrier_phase ordered after prior assignments. */ |
1513 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1514 | for (i = 0; i < n_barrier_cbs; i++) |
1515 | wake_up(&barrier_cbs_wq[i]); | |
1516 | wait_event(barrier_wq, | |
1517 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1518 | torture_must_stop()); |
1519 | if (torture_must_stop()) | |
fae4b54f PM |
1520 | break; |
1521 | n_barrier_attempts++; | |
78e4bc34 | 1522 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1523 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1524 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1525 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1526 | atomic_read(&barrier_cbs_invoked), | |
1527 | n_barrier_cbs); | |
fae4b54f PM |
1528 | WARN_ON_ONCE(1); |
1529 | } | |
1530 | n_barrier_successes++; | |
1531 | schedule_timeout_interruptible(HZ / 10); | |
36970bb9 | 1532 | } while (!torture_must_stop()); |
7fafaac5 | 1533 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1534 | return 0; |
1535 | } | |
1536 | ||
1537 | /* Initialize RCU barrier testing. */ | |
1538 | static int rcu_torture_barrier_init(void) | |
1539 | { | |
1540 | int i; | |
1541 | int ret; | |
1542 | ||
d9eba768 | 1543 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1544 | return 0; |
1545 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1546 | pr_alert("%s" TORTURE_FLAG |
1547 | " Call or barrier ops missing for %s,\n", | |
1548 | torture_type, cur_ops->name); | |
1549 | pr_alert("%s" TORTURE_FLAG | |
1550 | " RCU barrier testing omitted from run.\n", | |
1551 | torture_type); | |
fae4b54f PM |
1552 | return 0; |
1553 | } | |
1554 | atomic_set(&barrier_cbs_count, 0); | |
1555 | atomic_set(&barrier_cbs_invoked, 0); | |
1556 | barrier_cbs_tasks = | |
1557 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1558 | GFP_KERNEL); | |
1559 | barrier_cbs_wq = | |
1560 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1561 | GFP_KERNEL); | |
de5e6437 | 1562 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1563 | return -ENOMEM; |
1564 | for (i = 0; i < n_barrier_cbs; i++) { | |
1565 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1566 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1567 | (void *)(long)i, | |
1568 | barrier_cbs_tasks[i]); | |
1569 | if (ret) | |
fae4b54f | 1570 | return ret; |
fae4b54f | 1571 | } |
47cf29b9 | 1572 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1573 | } |
1574 | ||
1575 | /* Clean up after RCU barrier testing. */ | |
1576 | static void rcu_torture_barrier_cleanup(void) | |
1577 | { | |
1578 | int i; | |
1579 | ||
9c029b86 | 1580 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1581 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1582 | for (i = 0; i < n_barrier_cbs; i++) |
1583 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1584 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1585 | kfree(barrier_cbs_tasks); |
1586 | barrier_cbs_tasks = NULL; | |
1587 | } | |
1588 | if (barrier_cbs_wq != NULL) { | |
1589 | kfree(barrier_cbs_wq); | |
1590 | barrier_cbs_wq = NULL; | |
1591 | } | |
1592 | } | |
1593 | ||
0ffd374b | 1594 | static enum cpuhp_state rcutor_hp; |
8e8be45e | 1595 | |
a241ec65 PM |
1596 | static void |
1597 | rcu_torture_cleanup(void) | |
1598 | { | |
1599 | int i; | |
1600 | ||
4a298656 | 1601 | rcutorture_record_test_transition(); |
d36a7a0d | 1602 | if (torture_cleanup_begin()) { |
343e9099 PM |
1603 | if (cur_ops->cb_barrier != NULL) |
1604 | cur_ops->cb_barrier(); | |
1605 | return; | |
1606 | } | |
d84f5203 | 1607 | |
fae4b54f | 1608 | rcu_torture_barrier_cleanup(); |
9c029b86 | 1609 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1610 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1611 | |
c8e5b163 | 1612 | if (reader_tasks) { |
9c029b86 PM |
1613 | for (i = 0; i < nrealreaders; i++) |
1614 | torture_stop_kthread(rcu_torture_reader, | |
1615 | reader_tasks[i]); | |
a241ec65 | 1616 | kfree(reader_tasks); |
a241ec65 PM |
1617 | } |
1618 | rcu_torture_current = NULL; | |
1619 | ||
c8e5b163 | 1620 | if (fakewriter_tasks) { |
b772e1dd | 1621 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1622 | torture_stop_kthread(rcu_torture_fakewriter, |
1623 | fakewriter_tasks[i]); | |
b772e1dd JT |
1624 | } |
1625 | kfree(fakewriter_tasks); | |
1626 | fakewriter_tasks = NULL; | |
1627 | } | |
1628 | ||
9c029b86 PM |
1629 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1630 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1631 | for (i = 0; i < ncbflooders; i++) |
1632 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
8e8be45e | 1633 | if ((test_boost == 1 && cur_ops->can_boost) || |
0ffd374b SAS |
1634 | test_boost == 2) |
1635 | cpuhp_remove_state(rcutor_hp); | |
bf66f18e | 1636 | |
ca1d51ed PM |
1637 | /* |
1638 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1639 | * cleanup operations. | |
1640 | */ | |
2326974d PM |
1641 | if (cur_ops->cb_barrier != NULL) |
1642 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
1643 | if (cur_ops->cleanup != NULL) |
1644 | cur_ops->cleanup(); | |
a241ec65 | 1645 | |
a241ec65 | 1646 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1647 | |
fae4b54f | 1648 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1649 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 1650 | else if (torture_onoff_failures()) |
091541bb PM |
1651 | rcu_torture_print_module_parms(cur_ops, |
1652 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1653 | else |
8e8be45e | 1654 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 1655 | torture_cleanup_end(); |
a241ec65 PM |
1656 | } |
1657 | ||
d2818df1 PM |
1658 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1659 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1660 | { | |
1661 | } | |
1662 | ||
1663 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1664 | { | |
1665 | /* | |
1666 | * This -might- happen due to race conditions, but is unlikely. | |
1667 | * The scenario that leads to this happening is that the | |
1668 | * first of the pair of duplicate callbacks is queued, | |
1669 | * someone else starts a grace period that includes that | |
1670 | * callback, then the second of the pair must wait for the | |
1671 | * next grace period. Unlikely, but can happen. If it | |
1672 | * does happen, the debug-objects subsystem won't have splatted. | |
1673 | */ | |
1674 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1675 | } | |
1676 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1677 | ||
1678 | /* | |
1679 | * Verify that double-free causes debug-objects to complain, but only | |
1680 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1681 | * cannot be carried out. | |
1682 | */ | |
1683 | static void rcu_test_debug_objects(void) | |
1684 | { | |
1685 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1686 | struct rcu_head rh1; | |
1687 | struct rcu_head rh2; | |
1688 | ||
1689 | init_rcu_head_on_stack(&rh1); | |
1690 | init_rcu_head_on_stack(&rh2); | |
1691 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1692 | ||
1693 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1694 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1695 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1696 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1697 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1698 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1699 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1700 | local_irq_enable(); | |
1701 | rcu_read_unlock(); | |
1702 | preempt_enable(); | |
1703 | ||
1704 | /* Wait for them all to get done so we can safely return. */ | |
1705 | rcu_barrier(); | |
1706 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1707 | destroy_rcu_head_on_stack(&rh1); | |
1708 | destroy_rcu_head_on_stack(&rh2); | |
1709 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1710 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1711 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1712 | } | |
1713 | ||
6f8bc500 | 1714 | static int __init |
a241ec65 PM |
1715 | rcu_torture_init(void) |
1716 | { | |
1717 | int i; | |
1718 | int cpu; | |
1719 | int firsterr = 0; | |
2ec1f2d9 | 1720 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed PM |
1721 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
1722 | &sched_ops, RCUTORTURE_TASKS_OPS | |
2ec1f2d9 | 1723 | }; |
a241ec65 | 1724 | |
59da22a0 | 1725 | if (!torture_init_begin(torture_type, verbose, &torture_runnable)) |
5228084e | 1726 | return -EBUSY; |
343e9099 | 1727 | |
a241ec65 | 1728 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1729 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1730 | cur_ops = torture_ops[i]; |
ade5fb81 | 1731 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1732 | break; |
72e9bb54 | 1733 | } |
ade5fb81 | 1734 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1735 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1736 | torture_type); | |
1737 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1738 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1739 | pr_alert(" %s", torture_ops[i]->name); |
1740 | pr_alert("\n"); | |
889d487a PM |
1741 | firsterr = -EINVAL; |
1742 | goto unwind; | |
72e9bb54 | 1743 | } |
bf66f18e | 1744 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1745 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1746 | fqs_duration = 0; |
1747 | } | |
c8e5b163 | 1748 | if (cur_ops->init) |
889d487a | 1749 | cur_ops->init(); |
72e9bb54 | 1750 | |
64e4b43a | 1751 | if (nreaders >= 0) { |
a241ec65 | 1752 | nrealreaders = nreaders; |
64e4b43a | 1753 | } else { |
3838cc18 | 1754 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
1755 | if (nrealreaders <= 0) |
1756 | nrealreaders = 1; | |
1757 | } | |
8e8be45e | 1758 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
1759 | |
1760 | /* Set up the freelist. */ | |
1761 | ||
1762 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1763 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1764 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1765 | list_add_tail(&rcu_tortures[i].rtort_free, |
1766 | &rcu_torture_freelist); | |
1767 | } | |
1768 | ||
1769 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1770 | ||
1771 | rcu_torture_current = NULL; | |
1772 | rcu_torture_current_version = 0; | |
1773 | atomic_set(&n_rcu_torture_alloc, 0); | |
1774 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1775 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1776 | atomic_set(&n_rcu_torture_mberror, 0); |
1777 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1778 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1779 | n_rcu_torture_boost_ktrerror = 0; |
1780 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1781 | n_rcu_torture_boost_failure = 0; |
1782 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1783 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1784 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1785 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1786 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1787 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1788 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | /* Start up the kthreads. */ | |
1793 | ||
47cf29b9 PM |
1794 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
1795 | writer_task); | |
1796 | if (firsterr) | |
a241ec65 | 1797 | goto unwind; |
4444d852 PM |
1798 | if (nfakewriters > 0) { |
1799 | fakewriter_tasks = kzalloc(nfakewriters * | |
1800 | sizeof(fakewriter_tasks[0]), | |
1801 | GFP_KERNEL); | |
1802 | if (fakewriter_tasks == NULL) { | |
1803 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1804 | firsterr = -ENOMEM; | |
1805 | goto unwind; | |
1806 | } | |
b772e1dd JT |
1807 | } |
1808 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
1809 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
1810 | NULL, fakewriter_tasks[i]); | |
1811 | if (firsterr) | |
b772e1dd | 1812 | goto unwind; |
b772e1dd | 1813 | } |
2860aaba | 1814 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1815 | GFP_KERNEL); |
1816 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1817 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1818 | firsterr = -ENOMEM; |
1819 | goto unwind; | |
1820 | } | |
1821 | for (i = 0; i < nrealreaders; i++) { | |
47cf29b9 PM |
1822 | firsterr = torture_create_kthread(rcu_torture_reader, NULL, |
1823 | reader_tasks[i]); | |
1824 | if (firsterr) | |
a241ec65 | 1825 | goto unwind; |
a241ec65 PM |
1826 | } |
1827 | if (stat_interval > 0) { | |
47cf29b9 PM |
1828 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
1829 | stats_task); | |
1830 | if (firsterr) | |
a241ec65 | 1831 | goto unwind; |
a241ec65 | 1832 | } |
e8e255f7 | 1833 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
1834 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
1835 | if (firsterr) | |
d84f5203 | 1836 | goto unwind; |
d84f5203 | 1837 | } |
d120f65f PM |
1838 | if (stutter < 0) |
1839 | stutter = 0; | |
1840 | if (stutter) { | |
628edaa5 PM |
1841 | firsterr = torture_stutter_init(stutter * HZ); |
1842 | if (firsterr) | |
d120f65f | 1843 | goto unwind; |
d120f65f | 1844 | } |
bf66f18e PM |
1845 | if (fqs_duration < 0) |
1846 | fqs_duration = 0; | |
1847 | if (fqs_duration) { | |
628edaa5 | 1848 | /* Create the fqs thread */ |
d0d0606e PM |
1849 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
1850 | fqs_task); | |
47cf29b9 | 1851 | if (firsterr) |
bf66f18e | 1852 | goto unwind; |
bf66f18e | 1853 | } |
8e8be45e PM |
1854 | if (test_boost_interval < 1) |
1855 | test_boost_interval = 1; | |
1856 | if (test_boost_duration < 2) | |
1857 | test_boost_duration = 2; | |
1858 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1859 | test_boost == 2) { | |
8e8be45e PM |
1860 | |
1861 | boost_starttime = jiffies + test_boost_interval * HZ; | |
0ffd374b SAS |
1862 | |
1863 | firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE", | |
1864 | rcutorture_booster_init, | |
1865 | rcutorture_booster_cleanup); | |
1866 | if (firsterr < 0) | |
1867 | goto unwind; | |
1868 | rcutor_hp = firsterr; | |
8e8be45e | 1869 | } |
01025ebc PM |
1870 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
1871 | if (firsterr) | |
37e377d2 | 1872 | goto unwind; |
01025ebc PM |
1873 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval * HZ); |
1874 | if (firsterr) | |
37e377d2 | 1875 | goto unwind; |
01025ebc PM |
1876 | firsterr = rcu_torture_stall_init(); |
1877 | if (firsterr) | |
37e377d2 | 1878 | goto unwind; |
01025ebc PM |
1879 | firsterr = rcu_torture_barrier_init(); |
1880 | if (firsterr) | |
fae4b54f | 1881 | goto unwind; |
d2818df1 PM |
1882 | if (object_debug) |
1883 | rcu_test_debug_objects(); | |
38706bc5 PM |
1884 | if (cbflood_n_burst > 0) { |
1885 | /* Create the cbflood threads */ | |
1886 | ncbflooders = (num_online_cpus() + 3) / 4; | |
1887 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
1888 | GFP_KERNEL); | |
1889 | if (!cbflood_task) { | |
1890 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
1891 | firsterr = -ENOMEM; | |
1892 | goto unwind; | |
1893 | } | |
1894 | for (i = 0; i < ncbflooders; i++) { | |
1895 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
1896 | NULL, | |
1897 | cbflood_task[i]); | |
1898 | if (firsterr) | |
1899 | goto unwind; | |
1900 | } | |
1901 | } | |
4a298656 | 1902 | rcutorture_record_test_transition(); |
b5daa8f3 | 1903 | torture_init_end(); |
a241ec65 PM |
1904 | return 0; |
1905 | ||
1906 | unwind: | |
b5daa8f3 | 1907 | torture_init_end(); |
a241ec65 PM |
1908 | rcu_torture_cleanup(); |
1909 | return firsterr; | |
1910 | } | |
1911 | ||
1912 | module_init(rcu_torture_init); | |
1913 | module_exit(rcu_torture_cleanup); |