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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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
a71fca58 | 21 | * Josh Triplett <josh@freedesktop.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> |
a241ec65 PM |
52 | |
53 | MODULE_LICENSE("GPL"); | |
5cf05ad7 | 54 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>"); |
a241ec65 | 55 | |
4102adab PM |
56 | MODULE_ALIAS("rcutorture"); |
57 | #ifdef MODULE_PARAM_PREFIX | |
58 | #undef MODULE_PARAM_PREFIX | |
59 | #endif | |
60 | #define MODULE_PARAM_PREFIX "rcutorture." | |
61 | ||
9e250225 PM |
62 | torture_param(int, fqs_duration, 0, |
63 | "Duration of fqs bursts (us), 0 to disable"); | |
64 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
65 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
66 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); | |
67 | torture_param(bool, gp_normal, false, | |
68 | "Use normal (non-expedited) GP wait primitives"); | |
69 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); | |
70 | torture_param(int, n_barrier_cbs, 0, | |
71 | "# of callbacks/kthreads for barrier testing"); | |
72 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
73 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
74 | torture_param(int, object_debug, 0, | |
75 | "Enable debug-object double call_rcu() testing"); | |
76 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
77 | torture_param(int, onoff_interval, 0, | |
78 | "Time between CPU hotplugs (s), 0=disable"); | |
79 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); | |
80 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
81 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
82 | torture_param(int, stall_cpu_holdoff, 10, | |
83 | "Time to wait before starting stall (s)."); | |
84 | torture_param(int, stat_interval, 60, | |
85 | "Number of seconds between stats printk()s"); | |
86 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
87 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
88 | torture_param(int, test_boost_duration, 4, | |
89 | "Duration of each boost test, seconds."); | |
90 | torture_param(int, test_boost_interval, 7, | |
91 | "Interval between boost tests, seconds."); | |
92 | torture_param(bool, test_no_idle_hz, true, | |
93 | "Test support for tickless idle CPUs"); | |
9e250225 | 94 | |
f67a3356 PM |
95 | char *torture_type = "rcu"; |
96 | EXPORT_SYMBOL_GPL(torture_type); | |
d6ad6711 | 97 | module_param(torture_type, charp, 0444); |
d10453e9 | 98 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
f67a3356 PM |
99 | bool verbose; |
100 | EXPORT_SYMBOL_GPL(verbose); | |
101 | module_param(verbose, bool, 0444); | |
102 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); | |
72e9bb54 | 103 | |
a241ec65 PM |
104 | static int nrealreaders; |
105 | static struct task_struct *writer_task; | |
b772e1dd | 106 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
107 | static struct task_struct **reader_tasks; |
108 | static struct task_struct *stats_task; | |
d84f5203 | 109 | static struct task_struct *shuffler_task; |
d120f65f | 110 | static struct task_struct *stutter_task; |
bf66f18e | 111 | static struct task_struct *fqs_task; |
8e8be45e | 112 | static struct task_struct *boost_tasks[NR_CPUS]; |
d5f546d8 | 113 | static struct task_struct *shutdown_task; |
b58bdcca PM |
114 | #ifdef CONFIG_HOTPLUG_CPU |
115 | static struct task_struct *onoff_task; | |
116 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
c13f3757 | 117 | static struct task_struct *stall_task; |
fae4b54f PM |
118 | static struct task_struct **barrier_cbs_tasks; |
119 | static struct task_struct *barrier_task; | |
a241ec65 PM |
120 | |
121 | #define RCU_TORTURE_PIPE_LEN 10 | |
122 | ||
123 | struct rcu_torture { | |
124 | struct rcu_head rtort_rcu; | |
125 | int rtort_pipe_count; | |
126 | struct list_head rtort_free; | |
996417d2 | 127 | int rtort_mbtest; |
a241ec65 PM |
128 | }; |
129 | ||
a241ec65 | 130 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 131 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 132 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
133 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
134 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
806274c0 PM |
135 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], |
136 | rcu_torture_count) = { 0 }; | |
137 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], | |
138 | rcu_torture_batch) = { 0 }; | |
a241ec65 | 139 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; |
b2896d2e PM |
140 | static atomic_t n_rcu_torture_alloc; |
141 | static atomic_t n_rcu_torture_alloc_fail; | |
142 | static atomic_t n_rcu_torture_free; | |
143 | static atomic_t n_rcu_torture_mberror; | |
144 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 145 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
146 | static long n_rcu_torture_boost_ktrerror; |
147 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
148 | static long n_rcu_torture_boost_failure; |
149 | static long n_rcu_torture_boosts; | |
a71fca58 | 150 | static long n_rcu_torture_timers; |
b58bdcca PM |
151 | static long n_offline_attempts; |
152 | static long n_offline_successes; | |
13dbf914 PM |
153 | static unsigned long sum_offline; |
154 | static int min_offline = -1; | |
155 | static int max_offline; | |
b58bdcca PM |
156 | static long n_online_attempts; |
157 | static long n_online_successes; | |
13dbf914 PM |
158 | static unsigned long sum_online; |
159 | static int min_online = -1; | |
160 | static int max_online; | |
fae4b54f PM |
161 | static long n_barrier_attempts; |
162 | static long n_barrier_successes; | |
e3033736 | 163 | static struct list_head rcu_torture_removed; |
73d0a4b1 | 164 | static cpumask_var_t shuffle_tmp_mask; |
a241ec65 | 165 | |
a71fca58 | 166 | static int stutter_pause_test; |
d120f65f | 167 | |
31a72bce PM |
168 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
169 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
170 | #else | |
171 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
172 | #endif | |
173 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
174 | module_param(rcutorture_runnable, int, 0444); |
175 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 176 | |
3acf4a9a | 177 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 178 | #define rcu_can_boost() 1 |
3acf4a9a | 179 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 180 | #define rcu_can_boost() 0 |
3acf4a9a | 181 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 182 | |
e4aa0da3 SR |
183 | #ifdef CONFIG_RCU_TRACE |
184 | static u64 notrace rcu_trace_clock_local(void) | |
185 | { | |
186 | u64 ts = trace_clock_local(); | |
187 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
188 | return ts; | |
189 | } | |
190 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
191 | static u64 notrace rcu_trace_clock_local(void) | |
192 | { | |
193 | return 0ULL; | |
194 | } | |
195 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
196 | ||
d5f546d8 | 197 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
198 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
199 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
200 | /* and boost task create/destroy. */ | |
fae4b54f | 201 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 202 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
203 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
204 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
205 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 206 | |
d5f546d8 PM |
207 | /* Forward reference. */ |
208 | static void rcu_torture_cleanup(void); | |
209 | ||
343e9099 | 210 | /* |
c9d557c1 | 211 | * Detect and respond to a system shutdown. |
343e9099 PM |
212 | */ |
213 | static int | |
214 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
215 | unsigned long unused2, void *unused3) | |
216 | { | |
c59ab97e | 217 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 218 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 219 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 | 220 | else |
2caa1e44 | 221 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 222 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
c59ab97e | 223 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
224 | return NOTIFY_DONE; |
225 | } | |
226 | ||
a241ec65 PM |
227 | /* |
228 | * Allocate an element from the rcu_tortures pool. | |
229 | */ | |
97a41e26 | 230 | static struct rcu_torture * |
a241ec65 PM |
231 | rcu_torture_alloc(void) |
232 | { | |
233 | struct list_head *p; | |
234 | ||
adac1665 | 235 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
236 | if (list_empty(&rcu_torture_freelist)) { |
237 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 238 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
239 | return NULL; |
240 | } | |
241 | atomic_inc(&n_rcu_torture_alloc); | |
242 | p = rcu_torture_freelist.next; | |
243 | list_del_init(p); | |
adac1665 | 244 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
245 | return container_of(p, struct rcu_torture, rtort_free); |
246 | } | |
247 | ||
248 | /* | |
249 | * Free an element to the rcu_tortures pool. | |
250 | */ | |
251 | static void | |
252 | rcu_torture_free(struct rcu_torture *p) | |
253 | { | |
254 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 255 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 256 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 257 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
258 | } |
259 | ||
d120f65f | 260 | static void |
e66c33d5 | 261 | rcu_stutter_wait(const char *title) |
d120f65f | 262 | { |
c9d557c1 | 263 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
264 | if (rcutorture_runnable) |
265 | schedule_timeout_interruptible(1); | |
266 | else | |
3ccf79f4 | 267 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
f67a3356 | 268 | torture_shutdown_absorb(title); |
343e9099 | 269 | } |
d120f65f PM |
270 | } |
271 | ||
72e9bb54 PM |
272 | /* |
273 | * Operations vector for selecting different types of tests. | |
274 | */ | |
275 | ||
276 | struct rcu_torture_ops { | |
277 | void (*init)(void); | |
72e9bb54 | 278 | int (*readlock)(void); |
51b1130e | 279 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 PM |
280 | void (*readunlock)(int idx); |
281 | int (*completed)(void); | |
0acc512c | 282 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 283 | void (*sync)(void); |
2ec1f2d9 | 284 | void (*exp_sync)(void); |
fae4b54f | 285 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 286 | void (*cb_barrier)(void); |
bf66f18e | 287 | void (*fqs)(void); |
d1008950 | 288 | void (*stats)(char *page); |
0acc512c | 289 | int irq_capable; |
8e8be45e | 290 | int can_boost; |
e66c33d5 | 291 | const char *name; |
72e9bb54 | 292 | }; |
a71fca58 PM |
293 | |
294 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
295 | |
296 | /* | |
297 | * Definitions for rcu torture testing. | |
298 | */ | |
299 | ||
a49a4af7 | 300 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
301 | { |
302 | rcu_read_lock(); | |
303 | return 0; | |
304 | } | |
305 | ||
51b1130e | 306 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 307 | { |
b8d57a76 JT |
308 | const unsigned long shortdelay_us = 200; |
309 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 310 | |
b8d57a76 JT |
311 | /* We want a short delay sometimes to make a reader delay the grace |
312 | * period, and we want a long delay occasionally to trigger | |
313 | * force_quiescent_state. */ | |
b2896d2e | 314 | |
51b1130e | 315 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
b8d57a76 | 316 | mdelay(longdelay_ms); |
51b1130e | 317 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 318 | udelay(shortdelay_us); |
e546f485 | 319 | #ifdef CONFIG_PREEMPT |
51b1130e PM |
320 | if (!preempt_count() && |
321 | !(torture_random(rrsp) % (nrealreaders * 20000))) | |
e546f485 LJ |
322 | preempt_schedule(); /* No QS if preempt_disable() in effect */ |
323 | #endif | |
b2896d2e PM |
324 | } |
325 | ||
a49a4af7 | 326 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
327 | { |
328 | rcu_read_unlock(); | |
329 | } | |
330 | ||
331 | static int rcu_torture_completed(void) | |
332 | { | |
333 | return rcu_batches_completed(); | |
334 | } | |
335 | ||
336 | static void | |
337 | rcu_torture_cb(struct rcu_head *p) | |
338 | { | |
339 | int i; | |
340 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
341 | ||
c9d557c1 | 342 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
343 | /* Test is ending, just drop callbacks on the floor. */ |
344 | /* The next initialization will pick up the pieces. */ | |
345 | return; | |
346 | } | |
347 | i = rp->rtort_pipe_count; | |
348 | if (i > RCU_TORTURE_PIPE_LEN) | |
349 | i = RCU_TORTURE_PIPE_LEN; | |
350 | atomic_inc(&rcu_torture_wcount[i]); | |
351 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
352 | rp->rtort_mbtest = 0; | |
353 | rcu_torture_free(rp); | |
c701d5d9 | 354 | } else { |
0acc512c | 355 | cur_ops->deferred_free(rp); |
c701d5d9 | 356 | } |
72e9bb54 PM |
357 | } |
358 | ||
d9a3da06 PM |
359 | static int rcu_no_completed(void) |
360 | { | |
361 | return 0; | |
362 | } | |
363 | ||
72e9bb54 PM |
364 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
365 | { | |
366 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
367 | } | |
368 | ||
e3033736 JT |
369 | static void rcu_sync_torture_init(void) |
370 | { | |
371 | INIT_LIST_HEAD(&rcu_torture_removed); | |
372 | } | |
373 | ||
2ec1f2d9 | 374 | static struct rcu_torture_ops rcu_ops = { |
0acc512c | 375 | .init = rcu_sync_torture_init, |
0acc512c PM |
376 | .readlock = rcu_torture_read_lock, |
377 | .read_delay = rcu_read_delay, | |
378 | .readunlock = rcu_torture_read_unlock, | |
379 | .completed = rcu_torture_completed, | |
2ec1f2d9 | 380 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 381 | .sync = synchronize_rcu, |
2ec1f2d9 PM |
382 | .exp_sync = synchronize_rcu_expedited, |
383 | .call = call_rcu, | |
384 | .cb_barrier = rcu_barrier, | |
bf66f18e | 385 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
386 | .stats = NULL, |
387 | .irq_capable = 1, | |
8e8be45e | 388 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 389 | .name = "rcu" |
d9a3da06 PM |
390 | }; |
391 | ||
c32e0660 PM |
392 | /* |
393 | * Definitions for rcu_bh torture testing. | |
394 | */ | |
395 | ||
a49a4af7 | 396 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
397 | { |
398 | rcu_read_lock_bh(); | |
399 | return 0; | |
400 | } | |
401 | ||
a49a4af7 | 402 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
403 | { |
404 | rcu_read_unlock_bh(); | |
405 | } | |
406 | ||
407 | static int rcu_bh_torture_completed(void) | |
408 | { | |
409 | return rcu_batches_completed_bh(); | |
410 | } | |
411 | ||
412 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
413 | { | |
414 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
415 | } | |
416 | ||
417 | static struct rcu_torture_ops rcu_bh_ops = { | |
2ec1f2d9 | 418 | .init = rcu_sync_torture_init, |
0acc512c PM |
419 | .readlock = rcu_bh_torture_read_lock, |
420 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
421 | .readunlock = rcu_bh_torture_read_unlock, | |
422 | .completed = rcu_bh_torture_completed, | |
423 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 424 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 425 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 426 | .call = call_rcu_bh, |
0acc512c | 427 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 428 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
429 | .stats = NULL, |
430 | .irq_capable = 1, | |
431 | .name = "rcu_bh" | |
c32e0660 PM |
432 | }; |
433 | ||
b2896d2e PM |
434 | /* |
435 | * Definitions for srcu torture testing. | |
436 | */ | |
437 | ||
cda4dc81 | 438 | DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e | 439 | |
012d3ca8 | 440 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
441 | { |
442 | return srcu_read_lock(&srcu_ctl); | |
443 | } | |
444 | ||
51b1130e | 445 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
446 | { |
447 | long delay; | |
448 | const long uspertick = 1000000 / HZ; | |
449 | const long longdelay = 10; | |
450 | ||
451 | /* We want there to be long-running readers, but not all the time. */ | |
452 | ||
51b1130e PM |
453 | delay = torture_random(rrsp) % |
454 | (nrealreaders * 2 * longdelay * uspertick); | |
b2896d2e PM |
455 | if (!delay) |
456 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
457 | else |
458 | rcu_read_delay(rrsp); | |
b2896d2e PM |
459 | } |
460 | ||
012d3ca8 | 461 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
462 | { |
463 | srcu_read_unlock(&srcu_ctl, idx); | |
464 | } | |
465 | ||
466 | static int srcu_torture_completed(void) | |
467 | { | |
468 | return srcu_batches_completed(&srcu_ctl); | |
469 | } | |
470 | ||
9059c940 LJ |
471 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
472 | { | |
473 | call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); | |
474 | } | |
475 | ||
b772e1dd JT |
476 | static void srcu_torture_synchronize(void) |
477 | { | |
478 | synchronize_srcu(&srcu_ctl); | |
479 | } | |
480 | ||
e3f8d378 PM |
481 | static void srcu_torture_call(struct rcu_head *head, |
482 | void (*func)(struct rcu_head *head)) | |
483 | { | |
484 | call_srcu(&srcu_ctl, head, func); | |
485 | } | |
486 | ||
487 | static void srcu_torture_barrier(void) | |
488 | { | |
489 | srcu_barrier(&srcu_ctl); | |
490 | } | |
491 | ||
d1008950 | 492 | static void srcu_torture_stats(char *page) |
b2896d2e | 493 | { |
b2896d2e PM |
494 | int cpu; |
495 | int idx = srcu_ctl.completed & 0x1; | |
496 | ||
d1008950 | 497 | page += sprintf(page, "%s%s per-CPU(idx=%d):", |
b2896d2e PM |
498 | torture_type, TORTURE_FLAG, idx); |
499 | for_each_possible_cpu(cpu) { | |
d1008950 | 500 | page += sprintf(page, " %d(%lu,%lu)", cpu, |
b2896d2e PM |
501 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
502 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
503 | } | |
d1008950 | 504 | sprintf(page, "\n"); |
b2896d2e PM |
505 | } |
506 | ||
2ec1f2d9 PM |
507 | static void srcu_torture_synchronize_expedited(void) |
508 | { | |
509 | synchronize_srcu_expedited(&srcu_ctl); | |
510 | } | |
511 | ||
b2896d2e | 512 | static struct rcu_torture_ops srcu_ops = { |
cda4dc81 | 513 | .init = rcu_sync_torture_init, |
0acc512c PM |
514 | .readlock = srcu_torture_read_lock, |
515 | .read_delay = srcu_read_delay, | |
516 | .readunlock = srcu_torture_read_unlock, | |
517 | .completed = srcu_torture_completed, | |
9059c940 | 518 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 519 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 520 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
521 | .call = srcu_torture_call, |
522 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
523 | .stats = srcu_torture_stats, |
524 | .name = "srcu" | |
b2896d2e PM |
525 | }; |
526 | ||
4b6c2cca JT |
527 | /* |
528 | * Definitions for sched torture testing. | |
529 | */ | |
530 | ||
531 | static int sched_torture_read_lock(void) | |
532 | { | |
533 | preempt_disable(); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | static void sched_torture_read_unlock(int idx) | |
538 | { | |
539 | preempt_enable(); | |
540 | } | |
541 | ||
2326974d PM |
542 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
543 | { | |
544 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
545 | } | |
546 | ||
4b6c2cca | 547 | static struct rcu_torture_ops sched_ops = { |
0acc512c | 548 | .init = rcu_sync_torture_init, |
0acc512c PM |
549 | .readlock = sched_torture_read_lock, |
550 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
551 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 552 | .completed = rcu_no_completed, |
0acc512c | 553 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 554 | .sync = synchronize_sched, |
2ec1f2d9 PM |
555 | .exp_sync = synchronize_sched_expedited, |
556 | .call = call_rcu_sched, | |
0acc512c | 557 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 558 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
559 | .stats = NULL, |
560 | .irq_capable = 1, | |
561 | .name = "sched" | |
4b6c2cca JT |
562 | }; |
563 | ||
8e8be45e PM |
564 | /* |
565 | * RCU torture priority-boost testing. Runs one real-time thread per | |
566 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
567 | * spinning waiting for them to be invoked. If a given callback takes | |
568 | * too long to be invoked, we assume that priority inversion has occurred. | |
569 | */ | |
570 | ||
571 | struct rcu_boost_inflight { | |
572 | struct rcu_head rcu; | |
573 | int inflight; | |
574 | }; | |
575 | ||
576 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
577 | { | |
578 | struct rcu_boost_inflight *rbip = | |
579 | container_of(head, struct rcu_boost_inflight, rcu); | |
580 | ||
581 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
582 | rbip->inflight = 0; | |
583 | } | |
584 | ||
585 | static int rcu_torture_boost(void *arg) | |
586 | { | |
587 | unsigned long call_rcu_time; | |
588 | unsigned long endtime; | |
589 | unsigned long oldstarttime; | |
590 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
591 | struct sched_param sp; | |
592 | ||
5ccf60f2 | 593 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
594 | |
595 | /* Set real-time priority. */ | |
596 | sp.sched_priority = 1; | |
597 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 598 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
599 | n_rcu_torture_boost_rterror++; |
600 | } | |
601 | ||
561190e3 | 602 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
603 | /* Each pass through the following loop does one boost-test cycle. */ |
604 | do { | |
605 | /* Wait for the next test interval. */ | |
606 | oldstarttime = boost_starttime; | |
93898fb1 | 607 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 608 | schedule_timeout_interruptible(oldstarttime - jiffies); |
8e8be45e PM |
609 | rcu_stutter_wait("rcu_torture_boost"); |
610 | if (kthread_should_stop() || | |
611 | fullstop != FULLSTOP_DONTSTOP) | |
612 | goto checkwait; | |
613 | } | |
614 | ||
615 | /* Do one boost-test interval. */ | |
616 | endtime = oldstarttime + test_boost_duration * HZ; | |
617 | call_rcu_time = jiffies; | |
93898fb1 | 618 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
619 | /* If we don't have a callback in flight, post one. */ |
620 | if (!rbi.inflight) { | |
621 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
622 | rbi.inflight = 1; | |
623 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
624 | if (jiffies - call_rcu_time > | |
625 | test_boost_duration * HZ - HZ / 2) { | |
5ccf60f2 | 626 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); |
8e8be45e PM |
627 | n_rcu_torture_boost_failure++; |
628 | } | |
629 | call_rcu_time = jiffies; | |
630 | } | |
631 | cond_resched(); | |
632 | rcu_stutter_wait("rcu_torture_boost"); | |
633 | if (kthread_should_stop() || | |
634 | fullstop != FULLSTOP_DONTSTOP) | |
635 | goto checkwait; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Set the start time of the next test interval. | |
640 | * Yes, this is vulnerable to long delays, but such | |
641 | * delays simply cause a false negative for the next | |
642 | * interval. Besides, we are running at RT priority, | |
643 | * so delays should be relatively rare. | |
644 | */ | |
ab8f11e5 PM |
645 | while (oldstarttime == boost_starttime && |
646 | !kthread_should_stop()) { | |
8e8be45e PM |
647 | if (mutex_trylock(&boost_mutex)) { |
648 | boost_starttime = jiffies + | |
649 | test_boost_interval * HZ; | |
650 | n_rcu_torture_boosts++; | |
651 | mutex_unlock(&boost_mutex); | |
652 | break; | |
653 | } | |
654 | schedule_timeout_uninterruptible(1); | |
655 | } | |
656 | ||
657 | /* Go do the stutter. */ | |
658 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
659 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
660 | ||
661 | /* Clean up and exit. */ | |
5ccf60f2 | 662 | VERBOSE_TOROUT_STRING("rcu_torture_boost task stopping"); |
f67a3356 | 663 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e PM |
664 | while (!kthread_should_stop() || rbi.inflight) |
665 | schedule_timeout_uninterruptible(1); | |
666 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 667 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
668 | return 0; |
669 | } | |
670 | ||
bf66f18e PM |
671 | /* |
672 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
673 | * bursts of calls to force_quiescent_state(), increasing the probability | |
674 | * of occurrence of some important types of race conditions. | |
675 | */ | |
676 | static int | |
677 | rcu_torture_fqs(void *arg) | |
678 | { | |
679 | unsigned long fqs_resume_time; | |
680 | int fqs_burst_remaining; | |
681 | ||
5ccf60f2 | 682 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
683 | do { |
684 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
685 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
686 | !kthread_should_stop()) { | |
bf66f18e PM |
687 | schedule_timeout_interruptible(1); |
688 | } | |
689 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
690 | while (fqs_burst_remaining > 0 && |
691 | !kthread_should_stop()) { | |
bf66f18e PM |
692 | cur_ops->fqs(); |
693 | udelay(fqs_holdoff); | |
694 | fqs_burst_remaining -= fqs_holdoff; | |
695 | } | |
696 | rcu_stutter_wait("rcu_torture_fqs"); | |
697 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 698 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task stopping"); |
f67a3356 | 699 | torture_shutdown_absorb("rcu_torture_fqs"); |
bf66f18e PM |
700 | while (!kthread_should_stop()) |
701 | schedule_timeout_uninterruptible(1); | |
702 | return 0; | |
703 | } | |
704 | ||
a241ec65 PM |
705 | /* |
706 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
707 | * for that pointed to by rcu_torture_current, freeing the old structure | |
708 | * after a series of grace periods (the "pipeline"). | |
709 | */ | |
710 | static int | |
711 | rcu_torture_writer(void *arg) | |
712 | { | |
2ec1f2d9 | 713 | bool exp; |
a241ec65 | 714 | int i; |
a241ec65 | 715 | struct rcu_torture *rp; |
2ec1f2d9 | 716 | struct rcu_torture *rp1; |
a241ec65 | 717 | struct rcu_torture *old_rp; |
51b1130e | 718 | static DEFINE_TORTURE_RANDOM(rand); |
a241ec65 | 719 | |
5ccf60f2 | 720 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
dbdf65b1 IM |
721 | set_user_nice(current, 19); |
722 | ||
a241ec65 PM |
723 | do { |
724 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
725 | rp = rcu_torture_alloc(); |
726 | if (rp == NULL) | |
a241ec65 PM |
727 | continue; |
728 | rp->rtort_pipe_count = 0; | |
51b1130e | 729 | udelay(torture_random(&rand) & 0x3ff); |
0ddea0ea PM |
730 | old_rp = rcu_dereference_check(rcu_torture_current, |
731 | current == writer_task); | |
996417d2 | 732 | rp->rtort_mbtest = 1; |
a241ec65 | 733 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 734 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 735 | if (old_rp) { |
a241ec65 PM |
736 | i = old_rp->rtort_pipe_count; |
737 | if (i > RCU_TORTURE_PIPE_LEN) | |
738 | i = RCU_TORTURE_PIPE_LEN; | |
739 | atomic_inc(&rcu_torture_wcount[i]); | |
740 | old_rp->rtort_pipe_count++; | |
2ec1f2d9 | 741 | if (gp_normal == gp_exp) |
51b1130e | 742 | exp = !!(torture_random(&rand) & 0x80); |
2ec1f2d9 PM |
743 | else |
744 | exp = gp_exp; | |
745 | if (!exp) { | |
746 | cur_ops->deferred_free(old_rp); | |
747 | } else { | |
748 | cur_ops->exp_sync(); | |
749 | list_add(&old_rp->rtort_free, | |
750 | &rcu_torture_removed); | |
751 | list_for_each_entry_safe(rp, rp1, | |
752 | &rcu_torture_removed, | |
753 | rtort_free) { | |
754 | i = rp->rtort_pipe_count; | |
755 | if (i > RCU_TORTURE_PIPE_LEN) | |
756 | i = RCU_TORTURE_PIPE_LEN; | |
757 | atomic_inc(&rcu_torture_wcount[i]); | |
758 | if (++rp->rtort_pipe_count >= | |
759 | RCU_TORTURE_PIPE_LEN) { | |
760 | rp->rtort_mbtest = 0; | |
761 | list_del(&rp->rtort_free); | |
762 | rcu_torture_free(rp); | |
763 | } | |
764 | } | |
765 | } | |
a241ec65 | 766 | } |
4a298656 | 767 | rcutorture_record_progress(++rcu_torture_current_version); |
c9d557c1 PM |
768 | rcu_stutter_wait("rcu_torture_writer"); |
769 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 770 | VERBOSE_TOROUT_STRING("rcu_torture_writer task stopping"); |
f67a3356 | 771 | torture_shutdown_absorb("rcu_torture_writer"); |
c9d557c1 | 772 | while (!kthread_should_stop()) |
a241ec65 PM |
773 | schedule_timeout_uninterruptible(1); |
774 | return 0; | |
775 | } | |
776 | ||
b772e1dd JT |
777 | /* |
778 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
779 | * delay between calls. | |
780 | */ | |
781 | static int | |
782 | rcu_torture_fakewriter(void *arg) | |
783 | { | |
51b1130e | 784 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 785 | |
5ccf60f2 | 786 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
b772e1dd JT |
787 | set_user_nice(current, 19); |
788 | ||
789 | do { | |
51b1130e PM |
790 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
791 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 792 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 793 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 794 | cur_ops->cb_barrier(); |
2ec1f2d9 | 795 | } else if (gp_normal == gp_exp) { |
51b1130e | 796 | if (torture_random(&rand) & 0x80) |
2ec1f2d9 PM |
797 | cur_ops->sync(); |
798 | else | |
799 | cur_ops->exp_sync(); | |
800 | } else if (gp_normal) { | |
72472a02 | 801 | cur_ops->sync(); |
2ec1f2d9 PM |
802 | } else { |
803 | cur_ops->exp_sync(); | |
804 | } | |
c9d557c1 PM |
805 | rcu_stutter_wait("rcu_torture_fakewriter"); |
806 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd | 807 | |
5ccf60f2 | 808 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task stopping"); |
f67a3356 | 809 | torture_shutdown_absorb("rcu_torture_fakewriter"); |
c9d557c1 | 810 | while (!kthread_should_stop()) |
b772e1dd JT |
811 | schedule_timeout_uninterruptible(1); |
812 | return 0; | |
813 | } | |
814 | ||
91afaf30 PM |
815 | void rcutorture_trace_dump(void) |
816 | { | |
817 | static atomic_t beenhere = ATOMIC_INIT(0); | |
818 | ||
819 | if (atomic_read(&beenhere)) | |
820 | return; | |
821 | if (atomic_xchg(&beenhere, 1) != 0) | |
822 | return; | |
91afaf30 PM |
823 | ftrace_dump(DUMP_ALL); |
824 | } | |
825 | ||
0729fbf3 PM |
826 | /* |
827 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
828 | * incrementing the corresponding element of the pipeline array. The | |
829 | * counter in the element should never be greater than 1, otherwise, the | |
830 | * RCU implementation is broken. | |
831 | */ | |
832 | static void rcu_torture_timer(unsigned long unused) | |
833 | { | |
834 | int idx; | |
835 | int completed; | |
52494535 | 836 | int completed_end; |
51b1130e | 837 | static DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 PM |
838 | static DEFINE_SPINLOCK(rand_lock); |
839 | struct rcu_torture *p; | |
840 | int pipe_count; | |
52494535 | 841 | unsigned long long ts; |
0729fbf3 PM |
842 | |
843 | idx = cur_ops->readlock(); | |
844 | completed = cur_ops->completed(); | |
e4aa0da3 | 845 | ts = rcu_trace_clock_local(); |
632ee200 | 846 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
847 | rcu_read_lock_bh_held() || |
848 | rcu_read_lock_sched_held() || | |
849 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
850 | if (p == NULL) { |
851 | /* Leave because rcu_torture_writer is not yet underway */ | |
852 | cur_ops->readunlock(idx); | |
853 | return; | |
854 | } | |
855 | if (p->rtort_mbtest == 0) | |
856 | atomic_inc(&n_rcu_torture_mberror); | |
857 | spin_lock(&rand_lock); | |
0acc512c | 858 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
859 | n_rcu_torture_timers++; |
860 | spin_unlock(&rand_lock); | |
861 | preempt_disable(); | |
862 | pipe_count = p->rtort_pipe_count; | |
863 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
864 | /* Should not happen, but... */ | |
865 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
866 | } | |
52494535 PM |
867 | completed_end = cur_ops->completed(); |
868 | if (pipe_count > 1) { | |
52494535 PM |
869 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
870 | completed, completed_end); | |
91afaf30 | 871 | rcutorture_trace_dump(); |
52494535 | 872 | } |
dd17c8f7 | 873 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 874 | completed = completed_end - completed; |
0729fbf3 PM |
875 | if (completed > RCU_TORTURE_PIPE_LEN) { |
876 | /* Should not happen, but... */ | |
877 | completed = RCU_TORTURE_PIPE_LEN; | |
878 | } | |
dd17c8f7 | 879 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
880 | preempt_enable(); |
881 | cur_ops->readunlock(idx); | |
882 | } | |
883 | ||
a241ec65 PM |
884 | /* |
885 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
886 | * incrementing the corresponding element of the pipeline array. The | |
887 | * counter in the element should never be greater than 1, otherwise, the | |
888 | * RCU implementation is broken. | |
889 | */ | |
890 | static int | |
891 | rcu_torture_reader(void *arg) | |
892 | { | |
893 | int completed; | |
52494535 | 894 | int completed_end; |
72e9bb54 | 895 | int idx; |
51b1130e | 896 | DEFINE_TORTURE_RANDOM(rand); |
a241ec65 PM |
897 | struct rcu_torture *p; |
898 | int pipe_count; | |
0729fbf3 | 899 | struct timer_list t; |
52494535 | 900 | unsigned long long ts; |
a241ec65 | 901 | |
5ccf60f2 | 902 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
dbdf65b1 | 903 | set_user_nice(current, 19); |
0acc512c | 904 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 905 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 906 | |
a241ec65 | 907 | do { |
0acc512c | 908 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 909 | if (!timer_pending(&t)) |
6155fec9 | 910 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 911 | } |
72e9bb54 PM |
912 | idx = cur_ops->readlock(); |
913 | completed = cur_ops->completed(); | |
e4aa0da3 | 914 | ts = rcu_trace_clock_local(); |
632ee200 | 915 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
916 | rcu_read_lock_bh_held() || |
917 | rcu_read_lock_sched_held() || | |
918 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
919 | if (p == NULL) { |
920 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 921 | cur_ops->readunlock(idx); |
a241ec65 PM |
922 | schedule_timeout_interruptible(HZ); |
923 | continue; | |
924 | } | |
996417d2 PM |
925 | if (p->rtort_mbtest == 0) |
926 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 927 | cur_ops->read_delay(&rand); |
a241ec65 PM |
928 | preempt_disable(); |
929 | pipe_count = p->rtort_pipe_count; | |
930 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
931 | /* Should not happen, but... */ | |
932 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
933 | } | |
52494535 PM |
934 | completed_end = cur_ops->completed(); |
935 | if (pipe_count > 1) { | |
52494535 PM |
936 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
937 | ts, completed, completed_end); | |
91afaf30 | 938 | rcutorture_trace_dump(); |
52494535 | 939 | } |
dd17c8f7 | 940 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 941 | completed = completed_end - completed; |
a241ec65 PM |
942 | if (completed > RCU_TORTURE_PIPE_LEN) { |
943 | /* Should not happen, but... */ | |
944 | completed = RCU_TORTURE_PIPE_LEN; | |
945 | } | |
dd17c8f7 | 946 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 947 | preempt_enable(); |
72e9bb54 | 948 | cur_ops->readunlock(idx); |
a241ec65 | 949 | schedule(); |
c9d557c1 PM |
950 | rcu_stutter_wait("rcu_torture_reader"); |
951 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 952 | VERBOSE_TOROUT_STRING("rcu_torture_reader task stopping"); |
f67a3356 | 953 | torture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 954 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 955 | del_timer_sync(&t); |
c9d557c1 | 956 | while (!kthread_should_stop()) |
a241ec65 PM |
957 | schedule_timeout_uninterruptible(1); |
958 | return 0; | |
959 | } | |
960 | ||
961 | /* | |
962 | * Create an RCU-torture statistics message in the specified buffer. | |
963 | */ | |
d1008950 | 964 | static void |
a241ec65 PM |
965 | rcu_torture_printk(char *page) |
966 | { | |
a241ec65 PM |
967 | int cpu; |
968 | int i; | |
969 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
970 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
971 | ||
0a945022 | 972 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
973 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
974 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
975 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
976 | } | |
977 | } | |
978 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
979 | if (pipesummary[i] != 0) | |
980 | break; | |
981 | } | |
d1008950 CG |
982 | page += sprintf(page, "%s%s ", torture_type, TORTURE_FLAG); |
983 | page += sprintf(page, | |
5cf05ad7 | 984 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", |
a241ec65 PM |
985 | rcu_torture_current, |
986 | rcu_torture_current_version, | |
987 | list_empty(&rcu_torture_freelist), | |
988 | atomic_read(&n_rcu_torture_alloc), | |
989 | atomic_read(&n_rcu_torture_alloc_fail), | |
5cf05ad7 | 990 | atomic_read(&n_rcu_torture_free)); |
d1008950 | 991 | page += sprintf(page, "rtmbe: %d rtbke: %ld rtbre: %ld ", |
0729fbf3 | 992 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e | 993 | n_rcu_torture_boost_ktrerror, |
5cf05ad7 | 994 | n_rcu_torture_boost_rterror); |
d1008950 | 995 | page += sprintf(page, "rtbf: %ld rtb: %ld nt: %ld ", |
8e8be45e PM |
996 | n_rcu_torture_boost_failure, |
997 | n_rcu_torture_boosts, | |
5cf05ad7 | 998 | n_rcu_torture_timers); |
d1008950 | 999 | page += sprintf(page, |
13dbf914 PM |
1000 | "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", |
1001 | n_online_successes, n_online_attempts, | |
1002 | n_offline_successes, n_offline_attempts, | |
1003 | min_online, max_online, | |
1004 | min_offline, max_offline, | |
1005 | sum_online, sum_offline, HZ); | |
d1008950 | 1006 | page += sprintf(page, "barrier: %ld/%ld:%ld", |
fae4b54f PM |
1007 | n_barrier_successes, |
1008 | n_barrier_attempts, | |
1009 | n_rcu_torture_barrier_error); | |
d1008950 | 1010 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); |
8e8be45e | 1011 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1012 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1013 | n_rcu_torture_boost_ktrerror != 0 || |
1014 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1015 | n_rcu_torture_boost_failure != 0 || |
1016 | i > 1) { | |
d1008950 | 1017 | page += sprintf(page, "!!! "); |
996417d2 | 1018 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1019 | WARN_ON_ONCE(1); |
996417d2 | 1020 | } |
d1008950 | 1021 | page += sprintf(page, "Reader Pipe: "); |
a241ec65 | 1022 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1023 | page += sprintf(page, " %ld", pipesummary[i]); |
1024 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1025 | page += sprintf(page, "Reader Batch: "); | |
72e9bb54 | 1026 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
d1008950 CG |
1027 | page += sprintf(page, " %ld", batchsummary[i]); |
1028 | page += sprintf(page, "\n%s%s ", torture_type, TORTURE_FLAG); | |
1029 | page += sprintf(page, "Free-Block Circulation: "); | |
a241ec65 | 1030 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
d1008950 | 1031 | page += sprintf(page, " %d", |
a241ec65 PM |
1032 | atomic_read(&rcu_torture_wcount[i])); |
1033 | } | |
d1008950 | 1034 | page += sprintf(page, "\n"); |
c8e5b163 | 1035 | if (cur_ops->stats) |
d1008950 | 1036 | cur_ops->stats(page); |
a241ec65 PM |
1037 | } |
1038 | ||
1039 | /* | |
1040 | * Print torture statistics. Caller must ensure that there is only | |
1041 | * one call to this function at a given time!!! This is normally | |
1042 | * accomplished by relying on the module system to only have one copy | |
1043 | * of the module loaded, and then by giving the rcu_torture_stats | |
1044 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1045 | * thread is not running). | |
1046 | */ | |
1047 | static void | |
1048 | rcu_torture_stats_print(void) | |
1049 | { | |
d1008950 CG |
1050 | int size = nr_cpu_ids * 200 + 8192; |
1051 | char *buf; | |
a241ec65 | 1052 | |
d1008950 CG |
1053 | buf = kmalloc(size, GFP_KERNEL); |
1054 | if (!buf) { | |
1055 | pr_err("rcu-torture: Out of memory, need: %d", size); | |
1056 | return; | |
1057 | } | |
1058 | rcu_torture_printk(buf); | |
1059 | pr_alert("%s", buf); | |
1060 | kfree(buf); | |
a241ec65 PM |
1061 | } |
1062 | ||
1063 | /* | |
1064 | * Periodically prints torture statistics, if periodic statistics printing | |
1065 | * was specified via the stat_interval module parameter. | |
1066 | * | |
1067 | * No need to worry about fullstop here, since this one doesn't reference | |
1068 | * volatile state or register callbacks. | |
1069 | */ | |
1070 | static int | |
1071 | rcu_torture_stats(void *arg) | |
1072 | { | |
5ccf60f2 | 1073 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1074 | do { |
1075 | schedule_timeout_interruptible(stat_interval * HZ); | |
1076 | rcu_torture_stats_print(); | |
f67a3356 | 1077 | torture_shutdown_absorb("rcu_torture_stats"); |
c9d557c1 | 1078 | } while (!kthread_should_stop()); |
5ccf60f2 | 1079 | VERBOSE_TOROUT_STRING("rcu_torture_stats task stopping"); |
a241ec65 PM |
1080 | return 0; |
1081 | } | |
1082 | ||
d84f5203 SV |
1083 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
1084 | ||
1085 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case | |
1086 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. | |
1087 | */ | |
b2896d2e | 1088 | static void rcu_torture_shuffle_tasks(void) |
d84f5203 | 1089 | { |
d84f5203 SV |
1090 | int i; |
1091 | ||
73d0a4b1 | 1092 | cpumask_setall(shuffle_tmp_mask); |
86ef5c9a | 1093 | get_online_cpus(); |
d84f5203 SV |
1094 | |
1095 | /* No point in shuffling if there is only one online CPU (ex: UP) */ | |
c9d557c1 PM |
1096 | if (num_online_cpus() == 1) { |
1097 | put_online_cpus(); | |
1098 | return; | |
1099 | } | |
d84f5203 SV |
1100 | |
1101 | if (rcu_idle_cpu != -1) | |
73d0a4b1 | 1102 | cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f5203 | 1103 | |
73d0a4b1 | 1104 | set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f5203 | 1105 | |
c8e5b163 | 1106 | if (reader_tasks) { |
d84f5203 SV |
1107 | for (i = 0; i < nrealreaders; i++) |
1108 | if (reader_tasks[i]) | |
f70316da | 1109 | set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b1 | 1110 | shuffle_tmp_mask); |
d84f5203 | 1111 | } |
c8e5b163 | 1112 | if (fakewriter_tasks) { |
b772e1dd JT |
1113 | for (i = 0; i < nfakewriters; i++) |
1114 | if (fakewriter_tasks[i]) | |
f70316da | 1115 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b1 | 1116 | shuffle_tmp_mask); |
b772e1dd | 1117 | } |
d84f5203 | 1118 | if (writer_task) |
73d0a4b1 | 1119 | set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f5203 | 1120 | if (stats_task) |
73d0a4b1 | 1121 | set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
0e11c8e8 PM |
1122 | if (stutter_task) |
1123 | set_cpus_allowed_ptr(stutter_task, shuffle_tmp_mask); | |
1124 | if (fqs_task) | |
1125 | set_cpus_allowed_ptr(fqs_task, shuffle_tmp_mask); | |
1126 | if (shutdown_task) | |
1127 | set_cpus_allowed_ptr(shutdown_task, shuffle_tmp_mask); | |
1128 | #ifdef CONFIG_HOTPLUG_CPU | |
1129 | if (onoff_task) | |
1130 | set_cpus_allowed_ptr(onoff_task, shuffle_tmp_mask); | |
1131 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1132 | if (stall_task) | |
1133 | set_cpus_allowed_ptr(stall_task, shuffle_tmp_mask); | |
1134 | if (barrier_cbs_tasks) | |
1135 | for (i = 0; i < n_barrier_cbs; i++) | |
1136 | if (barrier_cbs_tasks[i]) | |
1137 | set_cpus_allowed_ptr(barrier_cbs_tasks[i], | |
1138 | shuffle_tmp_mask); | |
1139 | if (barrier_task) | |
1140 | set_cpus_allowed_ptr(barrier_task, shuffle_tmp_mask); | |
d84f5203 SV |
1141 | |
1142 | if (rcu_idle_cpu == -1) | |
1143 | rcu_idle_cpu = num_online_cpus() - 1; | |
1144 | else | |
1145 | rcu_idle_cpu--; | |
1146 | ||
86ef5c9a | 1147 | put_online_cpus(); |
d84f5203 SV |
1148 | } |
1149 | ||
1150 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the | |
1151 | * system to become idle at a time and cut off its timer ticks. This is meant | |
1152 | * to test the support for such tickless idle CPU in RCU. | |
1153 | */ | |
1154 | static int | |
1155 | rcu_torture_shuffle(void *arg) | |
1156 | { | |
5ccf60f2 | 1157 | VERBOSE_TOROUT_STRING("rcu_torture_shuffle task started"); |
d84f5203 SV |
1158 | do { |
1159 | schedule_timeout_interruptible(shuffle_interval * HZ); | |
1160 | rcu_torture_shuffle_tasks(); | |
f67a3356 | 1161 | torture_shutdown_absorb("rcu_torture_shuffle"); |
c9d557c1 | 1162 | } while (!kthread_should_stop()); |
5ccf60f2 | 1163 | VERBOSE_TOROUT_STRING("rcu_torture_shuffle task stopping"); |
d84f5203 SV |
1164 | return 0; |
1165 | } | |
1166 | ||
d120f65f PM |
1167 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1168 | * threads periodically. | |
1169 | */ | |
1170 | static int | |
1171 | rcu_torture_stutter(void *arg) | |
1172 | { | |
5ccf60f2 | 1173 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task started"); |
d120f65f PM |
1174 | do { |
1175 | schedule_timeout_interruptible(stutter * HZ); | |
1176 | stutter_pause_test = 1; | |
c9d557c1 | 1177 | if (!kthread_should_stop()) |
d120f65f PM |
1178 | schedule_timeout_interruptible(stutter * HZ); |
1179 | stutter_pause_test = 0; | |
f67a3356 | 1180 | torture_shutdown_absorb("rcu_torture_stutter"); |
c9d557c1 | 1181 | } while (!kthread_should_stop()); |
5ccf60f2 | 1182 | VERBOSE_TOROUT_STRING("rcu_torture_stutter task stopping"); |
d120f65f PM |
1183 | return 0; |
1184 | } | |
1185 | ||
95c38322 | 1186 | static inline void |
e66c33d5 | 1187 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1188 | { |
2caa1e44 PM |
1189 | pr_alert("%s" TORTURE_FLAG |
1190 | "--- %s: nreaders=%d nfakewriters=%d " | |
1191 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1192 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1193 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1194 | "test_boost=%d/%d test_boost_interval=%d " | |
1195 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1196 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1197 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1198 | "onoff_interval=%d onoff_holdoff=%d\n", |
1199 | torture_type, tag, nrealreaders, nfakewriters, | |
1200 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1201 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1202 | test_boost, cur_ops->can_boost, | |
1203 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1204 | stall_cpu, stall_cpu_holdoff, |
1205 | n_barrier_cbs, | |
2caa1e44 | 1206 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1207 | } |
1208 | ||
8e8be45e | 1209 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1210 | .notifier_call = rcutorture_shutdown_notify, |
1211 | }; | |
1212 | ||
8e8be45e PM |
1213 | static void rcutorture_booster_cleanup(int cpu) |
1214 | { | |
1215 | struct task_struct *t; | |
1216 | ||
1217 | if (boost_tasks[cpu] == NULL) | |
1218 | return; | |
1219 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1220 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_boost task"); |
8e8be45e PM |
1221 | t = boost_tasks[cpu]; |
1222 | boost_tasks[cpu] = NULL; | |
1223 | mutex_unlock(&boost_mutex); | |
1224 | ||
1225 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1226 | kthread_stop(t); | |
37e377d2 | 1227 | boost_tasks[cpu] = NULL; |
8e8be45e PM |
1228 | } |
1229 | ||
1230 | static int rcutorture_booster_init(int cpu) | |
1231 | { | |
1232 | int retval; | |
1233 | ||
1234 | if (boost_tasks[cpu] != NULL) | |
1235 | return 0; /* Already created, nothing more to do. */ | |
1236 | ||
1237 | /* Don't allow time recalculation while creating a new task. */ | |
1238 | mutex_lock(&boost_mutex); | |
5ccf60f2 | 1239 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1240 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1241 | cpu_to_node(cpu), | |
1242 | "rcu_torture_boost"); | |
8e8be45e PM |
1243 | if (IS_ERR(boost_tasks[cpu])) { |
1244 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1245 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1246 | n_rcu_torture_boost_ktrerror++; |
1247 | boost_tasks[cpu] = NULL; | |
1248 | mutex_unlock(&boost_mutex); | |
1249 | return retval; | |
1250 | } | |
1251 | kthread_bind(boost_tasks[cpu], cpu); | |
1252 | wake_up_process(boost_tasks[cpu]); | |
1253 | mutex_unlock(&boost_mutex); | |
1254 | return 0; | |
1255 | } | |
1256 | ||
d5f546d8 PM |
1257 | /* |
1258 | * Cause the rcutorture test to shutdown the system after the test has | |
1259 | * run for the time specified by the shutdown_secs module parameter. | |
1260 | */ | |
1261 | static int | |
1262 | rcu_torture_shutdown(void *arg) | |
1263 | { | |
1264 | long delta; | |
1265 | unsigned long jiffies_snap; | |
1266 | ||
5ccf60f2 | 1267 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task started"); |
d5f546d8 PM |
1268 | jiffies_snap = ACCESS_ONCE(jiffies); |
1269 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1270 | !kthread_should_stop()) { | |
1271 | delta = shutdown_time - jiffies_snap; | |
1272 | if (verbose) | |
2caa1e44 PM |
1273 | pr_alert("%s" TORTURE_FLAG |
1274 | "rcu_torture_shutdown task: %lu jiffies remaining\n", | |
1275 | torture_type, delta); | |
d5f546d8 PM |
1276 | schedule_timeout_interruptible(delta); |
1277 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1278 | } | |
b58bdcca | 1279 | if (kthread_should_stop()) { |
5ccf60f2 | 1280 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task stopping"); |
d5f546d8 PM |
1281 | return 0; |
1282 | } | |
1283 | ||
1284 | /* OK, shut down the system. */ | |
1285 | ||
5ccf60f2 | 1286 | VERBOSE_TOROUT_STRING("rcu_torture_shutdown task shutting down system"); |
d5f546d8 PM |
1287 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ |
1288 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1289 | kernel_power_off(); /* Shut down the system. */ | |
1290 | return 0; | |
1291 | } | |
1292 | ||
b58bdcca PM |
1293 | #ifdef CONFIG_HOTPLUG_CPU |
1294 | ||
1295 | /* | |
1296 | * Execute random CPU-hotplug operations at the interval specified | |
1297 | * by the onoff_interval. | |
1298 | */ | |
49fb4c62 | 1299 | static int |
b58bdcca PM |
1300 | rcu_torture_onoff(void *arg) |
1301 | { | |
1302 | int cpu; | |
13dbf914 | 1303 | unsigned long delta; |
b58bdcca | 1304 | int maxcpu = -1; |
51b1130e | 1305 | DEFINE_TORTURE_RANDOM(rand); |
48983260 | 1306 | int ret; |
13dbf914 | 1307 | unsigned long starttime; |
b58bdcca | 1308 | |
5ccf60f2 | 1309 | VERBOSE_TOROUT_STRING("rcu_torture_onoff task started"); |
b58bdcca PM |
1310 | for_each_online_cpu(cpu) |
1311 | maxcpu = cpu; | |
1312 | WARN_ON(maxcpu < 0); | |
9b9ec9b9 | 1313 | if (onoff_holdoff > 0) { |
5ccf60f2 | 1314 | VERBOSE_TOROUT_STRING("rcu_torture_onoff begin holdoff"); |
9b9ec9b9 | 1315 | schedule_timeout_interruptible(onoff_holdoff * HZ); |
5ccf60f2 | 1316 | VERBOSE_TOROUT_STRING("rcu_torture_onoff end holdoff"); |
9b9ec9b9 | 1317 | } |
b58bdcca | 1318 | while (!kthread_should_stop()) { |
51b1130e | 1319 | cpu = (torture_random(&rand) >> 4) % (maxcpu + 1); |
f220242a | 1320 | if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1321 | if (verbose) |
2caa1e44 PM |
1322 | pr_alert("%s" TORTURE_FLAG |
1323 | "rcu_torture_onoff task: offlining %d\n", | |
1324 | torture_type, cpu); | |
13dbf914 | 1325 | starttime = jiffies; |
b58bdcca | 1326 | n_offline_attempts++; |
48983260 PM |
1327 | ret = cpu_down(cpu); |
1328 | if (ret) { | |
1329 | if (verbose) | |
1330 | pr_alert("%s" TORTURE_FLAG | |
1331 | "rcu_torture_onoff task: offline %d failed: errno %d\n", | |
1332 | torture_type, cpu, ret); | |
1333 | } else { | |
b58bdcca | 1334 | if (verbose) |
2caa1e44 PM |
1335 | pr_alert("%s" TORTURE_FLAG |
1336 | "rcu_torture_onoff task: offlined %d\n", | |
1337 | torture_type, cpu); | |
b58bdcca | 1338 | n_offline_successes++; |
13dbf914 PM |
1339 | delta = jiffies - starttime; |
1340 | sum_offline += delta; | |
1341 | if (min_offline < 0) { | |
1342 | min_offline = delta; | |
1343 | max_offline = delta; | |
1344 | } | |
1345 | if (min_offline > delta) | |
1346 | min_offline = delta; | |
1347 | if (max_offline < delta) | |
1348 | max_offline = delta; | |
b58bdcca | 1349 | } |
f220242a | 1350 | } else if (cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1351 | if (verbose) |
2caa1e44 PM |
1352 | pr_alert("%s" TORTURE_FLAG |
1353 | "rcu_torture_onoff task: onlining %d\n", | |
1354 | torture_type, cpu); | |
13dbf914 | 1355 | starttime = jiffies; |
b58bdcca | 1356 | n_online_attempts++; |
7a6a4107 PM |
1357 | ret = cpu_up(cpu); |
1358 | if (ret) { | |
1359 | if (verbose) | |
1360 | pr_alert("%s" TORTURE_FLAG | |
1361 | "rcu_torture_onoff task: online %d failed: errno %d\n", | |
1362 | torture_type, cpu, ret); | |
1363 | } else { | |
b58bdcca | 1364 | if (verbose) |
2caa1e44 PM |
1365 | pr_alert("%s" TORTURE_FLAG |
1366 | "rcu_torture_onoff task: onlined %d\n", | |
1367 | torture_type, cpu); | |
b58bdcca | 1368 | n_online_successes++; |
13dbf914 PM |
1369 | delta = jiffies - starttime; |
1370 | sum_online += delta; | |
1371 | if (min_online < 0) { | |
1372 | min_online = delta; | |
1373 | max_online = delta; | |
1374 | } | |
1375 | if (min_online > delta) | |
1376 | min_online = delta; | |
1377 | if (max_online < delta) | |
1378 | max_online = delta; | |
b58bdcca PM |
1379 | } |
1380 | } | |
1381 | schedule_timeout_interruptible(onoff_interval * HZ); | |
1382 | } | |
5ccf60f2 | 1383 | VERBOSE_TOROUT_STRING("rcu_torture_onoff task stopping"); |
b58bdcca PM |
1384 | return 0; |
1385 | } | |
1386 | ||
49fb4c62 | 1387 | static int |
b58bdcca PM |
1388 | rcu_torture_onoff_init(void) |
1389 | { | |
3c1b1ce0 JL |
1390 | int ret; |
1391 | ||
b58bdcca PM |
1392 | if (onoff_interval <= 0) |
1393 | return 0; | |
1394 | onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); | |
1395 | if (IS_ERR(onoff_task)) { | |
3c1b1ce0 | 1396 | ret = PTR_ERR(onoff_task); |
b58bdcca | 1397 | onoff_task = NULL; |
3c1b1ce0 | 1398 | return ret; |
b58bdcca PM |
1399 | } |
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | static void rcu_torture_onoff_cleanup(void) | |
1404 | { | |
1405 | if (onoff_task == NULL) | |
1406 | return; | |
5ccf60f2 | 1407 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_onoff task"); |
b58bdcca | 1408 | kthread_stop(onoff_task); |
37e377d2 | 1409 | onoff_task = NULL; |
b58bdcca PM |
1410 | } |
1411 | ||
1412 | #else /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1413 | ||
37e377d2 | 1414 | static int |
b58bdcca PM |
1415 | rcu_torture_onoff_init(void) |
1416 | { | |
37e377d2 | 1417 | return 0; |
b58bdcca PM |
1418 | } |
1419 | ||
1420 | static void rcu_torture_onoff_cleanup(void) | |
1421 | { | |
1422 | } | |
1423 | ||
1424 | #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ | |
1425 | ||
c13f3757 PM |
1426 | /* |
1427 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1428 | * induces a CPU stall for the time specified by stall_cpu. | |
1429 | */ | |
49fb4c62 | 1430 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1431 | { |
1432 | unsigned long stop_at; | |
1433 | ||
5ccf60f2 | 1434 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1435 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1436 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1437 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1438 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1439 | } |
1440 | if (!kthread_should_stop()) { | |
1441 | stop_at = get_seconds() + stall_cpu; | |
1442 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1443 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1444 | rcu_read_lock(); |
1445 | preempt_disable(); | |
1446 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1447 | continue; /* Induce RCU CPU stall warning. */ | |
1448 | preempt_enable(); | |
1449 | rcu_read_unlock(); | |
2caa1e44 | 1450 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1451 | } |
f67a3356 | 1452 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1453 | while (!kthread_should_stop()) |
1454 | schedule_timeout_interruptible(10 * HZ); | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1459 | static int __init rcu_torture_stall_init(void) | |
1460 | { | |
1461 | int ret; | |
1462 | ||
1463 | if (stall_cpu <= 0) | |
1464 | return 0; | |
1465 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1466 | if (IS_ERR(stall_task)) { | |
1467 | ret = PTR_ERR(stall_task); | |
1468 | stall_task = NULL; | |
1469 | return ret; | |
1470 | } | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1475 | static void rcu_torture_stall_cleanup(void) | |
1476 | { | |
1477 | if (stall_task == NULL) | |
1478 | return; | |
5ccf60f2 | 1479 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stall_task."); |
c13f3757 | 1480 | kthread_stop(stall_task); |
37e377d2 | 1481 | stall_task = NULL; |
c13f3757 PM |
1482 | } |
1483 | ||
fae4b54f PM |
1484 | /* Callback function for RCU barrier testing. */ |
1485 | void rcu_torture_barrier_cbf(struct rcu_head *rcu) | |
1486 | { | |
1487 | atomic_inc(&barrier_cbs_invoked); | |
1488 | } | |
1489 | ||
1490 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1491 | static int rcu_torture_barrier_cbs(void *arg) | |
1492 | { | |
1493 | long myid = (long)arg; | |
c6ebcbb6 | 1494 | bool lastphase = 0; |
78e4bc34 | 1495 | bool newphase; |
fae4b54f PM |
1496 | struct rcu_head rcu; |
1497 | ||
1498 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1499 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
fae4b54f PM |
1500 | set_user_nice(current, 19); |
1501 | do { | |
1502 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 PM |
1503 | (newphase = |
1504 | ACCESS_ONCE(barrier_phase)) != lastphase || | |
fae4b54f PM |
1505 | kthread_should_stop() || |
1506 | fullstop != FULLSTOP_DONTSTOP); | |
78e4bc34 | 1507 | lastphase = newphase; |
c6ebcbb6 | 1508 | smp_mb(); /* ensure barrier_phase load before ->call(). */ |
fae4b54f PM |
1509 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) |
1510 | break; | |
1511 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1512 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1513 | wake_up(&barrier_wq); | |
1514 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1515 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task stopping"); |
f67a3356 | 1516 | torture_shutdown_absorb("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1517 | while (!kthread_should_stop()) |
1518 | schedule_timeout_interruptible(1); | |
1519 | cur_ops->cb_barrier(); | |
1520 | destroy_rcu_head_on_stack(&rcu); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1525 | static int rcu_torture_barrier(void *arg) | |
1526 | { | |
1527 | int i; | |
1528 | ||
5ccf60f2 | 1529 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1530 | do { |
1531 | atomic_set(&barrier_cbs_invoked, 0); | |
1532 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
c6ebcbb6 PM |
1533 | smp_mb(); /* Ensure barrier_phase after prior assignments. */ |
1534 | barrier_phase = !barrier_phase; | |
fae4b54f PM |
1535 | for (i = 0; i < n_barrier_cbs; i++) |
1536 | wake_up(&barrier_cbs_wq[i]); | |
1537 | wait_event(barrier_wq, | |
1538 | atomic_read(&barrier_cbs_count) == 0 || | |
1539 | kthread_should_stop() || | |
1540 | fullstop != FULLSTOP_DONTSTOP); | |
1541 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1542 | break; | |
1543 | n_barrier_attempts++; | |
78e4bc34 | 1544 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1545 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1546 | n_rcu_torture_barrier_error++; | |
1547 | WARN_ON_ONCE(1); | |
1548 | } | |
1549 | n_barrier_successes++; | |
1550 | schedule_timeout_interruptible(HZ / 10); | |
1551 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
5ccf60f2 | 1552 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task stopping"); |
f67a3356 | 1553 | torture_shutdown_absorb("rcu_torture_barrier"); |
fae4b54f PM |
1554 | while (!kthread_should_stop()) |
1555 | schedule_timeout_interruptible(1); | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* Initialize RCU barrier testing. */ | |
1560 | static int rcu_torture_barrier_init(void) | |
1561 | { | |
1562 | int i; | |
1563 | int ret; | |
1564 | ||
1565 | if (n_barrier_cbs == 0) | |
1566 | return 0; | |
1567 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1568 | pr_alert("%s" TORTURE_FLAG |
1569 | " Call or barrier ops missing for %s,\n", | |
1570 | torture_type, cur_ops->name); | |
1571 | pr_alert("%s" TORTURE_FLAG | |
1572 | " RCU barrier testing omitted from run.\n", | |
1573 | torture_type); | |
fae4b54f PM |
1574 | return 0; |
1575 | } | |
1576 | atomic_set(&barrier_cbs_count, 0); | |
1577 | atomic_set(&barrier_cbs_invoked, 0); | |
1578 | barrier_cbs_tasks = | |
1579 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1580 | GFP_KERNEL); | |
1581 | barrier_cbs_wq = | |
1582 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1583 | GFP_KERNEL); | |
de5e6437 | 1584 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1585 | return -ENOMEM; |
1586 | for (i = 0; i < n_barrier_cbs; i++) { | |
1587 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
1588 | barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, | |
9059c940 | 1589 | (void *)(long)i, |
fae4b54f PM |
1590 | "rcu_torture_barrier_cbs"); |
1591 | if (IS_ERR(barrier_cbs_tasks[i])) { | |
1592 | ret = PTR_ERR(barrier_cbs_tasks[i]); | |
5ccf60f2 | 1593 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); |
fae4b54f PM |
1594 | barrier_cbs_tasks[i] = NULL; |
1595 | return ret; | |
1596 | } | |
1597 | } | |
1598 | barrier_task = kthread_run(rcu_torture_barrier, NULL, | |
1599 | "rcu_torture_barrier"); | |
1600 | if (IS_ERR(barrier_task)) { | |
1601 | ret = PTR_ERR(barrier_task); | |
5ccf60f2 | 1602 | VERBOSE_TOROUT_ERRSTRING("Failed to create rcu_torture_barrier"); |
fae4b54f PM |
1603 | barrier_task = NULL; |
1604 | } | |
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | /* Clean up after RCU barrier testing. */ | |
1609 | static void rcu_torture_barrier_cleanup(void) | |
1610 | { | |
1611 | int i; | |
1612 | ||
1613 | if (barrier_task != NULL) { | |
5ccf60f2 | 1614 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier task"); |
fae4b54f PM |
1615 | kthread_stop(barrier_task); |
1616 | barrier_task = NULL; | |
1617 | } | |
1618 | if (barrier_cbs_tasks != NULL) { | |
1619 | for (i = 0; i < n_barrier_cbs; i++) { | |
1620 | if (barrier_cbs_tasks[i] != NULL) { | |
5ccf60f2 | 1621 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_barrier_cbs task"); |
fae4b54f PM |
1622 | kthread_stop(barrier_cbs_tasks[i]); |
1623 | barrier_cbs_tasks[i] = NULL; | |
1624 | } | |
1625 | } | |
1626 | kfree(barrier_cbs_tasks); | |
1627 | barrier_cbs_tasks = NULL; | |
1628 | } | |
1629 | if (barrier_cbs_wq != NULL) { | |
1630 | kfree(barrier_cbs_wq); | |
1631 | barrier_cbs_wq = NULL; | |
1632 | } | |
1633 | } | |
1634 | ||
8e8be45e PM |
1635 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1636 | unsigned long action, void *hcpu) | |
1637 | { | |
1638 | long cpu = (long)hcpu; | |
1639 | ||
1640 | switch (action) { | |
1641 | case CPU_ONLINE: | |
1642 | case CPU_DOWN_FAILED: | |
1643 | (void)rcutorture_booster_init(cpu); | |
1644 | break; | |
1645 | case CPU_DOWN_PREPARE: | |
1646 | rcutorture_booster_cleanup(cpu); | |
1647 | break; | |
1648 | default: | |
1649 | break; | |
1650 | } | |
1651 | return NOTIFY_OK; | |
1652 | } | |
1653 | ||
1654 | static struct notifier_block rcutorture_cpu_nb = { | |
1655 | .notifier_call = rcutorture_cpu_notify, | |
1656 | }; | |
1657 | ||
a241ec65 PM |
1658 | static void |
1659 | rcu_torture_cleanup(void) | |
1660 | { | |
1661 | int i; | |
1662 | ||
343e9099 | 1663 | mutex_lock(&fullstop_mutex); |
4a298656 | 1664 | rcutorture_record_test_transition(); |
c9d557c1 | 1665 | if (fullstop == FULLSTOP_SHUTDOWN) { |
2caa1e44 | 1666 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 1667 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
343e9099 | 1668 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1669 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1670 | if (cur_ops->cb_barrier != NULL) |
1671 | cur_ops->cb_barrier(); | |
1672 | return; | |
1673 | } | |
c9d557c1 | 1674 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1675 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1676 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
fae4b54f | 1677 | rcu_torture_barrier_cleanup(); |
c13f3757 | 1678 | rcu_torture_stall_cleanup(); |
d120f65f | 1679 | if (stutter_task) { |
5ccf60f2 | 1680 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stutter task"); |
d120f65f PM |
1681 | kthread_stop(stutter_task); |
1682 | } | |
1683 | stutter_task = NULL; | |
c8e5b163 | 1684 | if (shuffler_task) { |
5ccf60f2 | 1685 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_shuffle task"); |
d84f5203 | 1686 | kthread_stop(shuffler_task); |
73d0a4b1 | 1687 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
1688 | } |
1689 | shuffler_task = NULL; | |
1690 | ||
c8e5b163 | 1691 | if (writer_task) { |
5ccf60f2 | 1692 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_writer task"); |
a241ec65 PM |
1693 | kthread_stop(writer_task); |
1694 | } | |
1695 | writer_task = NULL; | |
1696 | ||
c8e5b163 | 1697 | if (reader_tasks) { |
a241ec65 | 1698 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1699 | if (reader_tasks[i]) { |
5ccf60f2 | 1700 | VERBOSE_TOROUT_STRING( |
a241ec65 PM |
1701 | "Stopping rcu_torture_reader task"); |
1702 | kthread_stop(reader_tasks[i]); | |
1703 | } | |
1704 | reader_tasks[i] = NULL; | |
1705 | } | |
1706 | kfree(reader_tasks); | |
1707 | reader_tasks = NULL; | |
1708 | } | |
1709 | rcu_torture_current = NULL; | |
1710 | ||
c8e5b163 | 1711 | if (fakewriter_tasks) { |
b772e1dd | 1712 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1713 | if (fakewriter_tasks[i]) { |
5ccf60f2 | 1714 | VERBOSE_TOROUT_STRING( |
b772e1dd JT |
1715 | "Stopping rcu_torture_fakewriter task"); |
1716 | kthread_stop(fakewriter_tasks[i]); | |
1717 | } | |
1718 | fakewriter_tasks[i] = NULL; | |
1719 | } | |
1720 | kfree(fakewriter_tasks); | |
1721 | fakewriter_tasks = NULL; | |
1722 | } | |
1723 | ||
c8e5b163 | 1724 | if (stats_task) { |
5ccf60f2 | 1725 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_stats task"); |
a241ec65 PM |
1726 | kthread_stop(stats_task); |
1727 | } | |
1728 | stats_task = NULL; | |
1729 | ||
bf66f18e | 1730 | if (fqs_task) { |
5ccf60f2 | 1731 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_fqs task"); |
bf66f18e PM |
1732 | kthread_stop(fqs_task); |
1733 | } | |
1734 | fqs_task = NULL; | |
8e8be45e PM |
1735 | if ((test_boost == 1 && cur_ops->can_boost) || |
1736 | test_boost == 2) { | |
1737 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1738 | for_each_possible_cpu(i) | |
1739 | rcutorture_booster_cleanup(i); | |
1740 | } | |
d5f546d8 | 1741 | if (shutdown_task != NULL) { |
5ccf60f2 | 1742 | VERBOSE_TOROUT_STRING("Stopping rcu_torture_shutdown task"); |
d5f546d8 PM |
1743 | kthread_stop(shutdown_task); |
1744 | } | |
37e377d2 | 1745 | shutdown_task = NULL; |
b58bdcca | 1746 | rcu_torture_onoff_cleanup(); |
bf66f18e | 1747 | |
a241ec65 | 1748 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1749 | |
1750 | if (cur_ops->cb_barrier != NULL) | |
1751 | cur_ops->cb_barrier(); | |
a241ec65 | 1752 | |
a241ec65 | 1753 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1754 | |
fae4b54f | 1755 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1756 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bb PM |
1757 | else if (n_online_successes != n_online_attempts || |
1758 | n_offline_successes != n_offline_attempts) | |
1759 | rcu_torture_print_module_parms(cur_ops, | |
1760 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1761 | else |
8e8be45e | 1762 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1763 | } |
1764 | ||
d2818df1 PM |
1765 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1766 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1767 | { | |
1768 | } | |
1769 | ||
1770 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1771 | { | |
1772 | /* | |
1773 | * This -might- happen due to race conditions, but is unlikely. | |
1774 | * The scenario that leads to this happening is that the | |
1775 | * first of the pair of duplicate callbacks is queued, | |
1776 | * someone else starts a grace period that includes that | |
1777 | * callback, then the second of the pair must wait for the | |
1778 | * next grace period. Unlikely, but can happen. If it | |
1779 | * does happen, the debug-objects subsystem won't have splatted. | |
1780 | */ | |
1781 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1782 | } | |
1783 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1784 | ||
1785 | /* | |
1786 | * Verify that double-free causes debug-objects to complain, but only | |
1787 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1788 | * cannot be carried out. | |
1789 | */ | |
1790 | static void rcu_test_debug_objects(void) | |
1791 | { | |
1792 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1793 | struct rcu_head rh1; | |
1794 | struct rcu_head rh2; | |
1795 | ||
1796 | init_rcu_head_on_stack(&rh1); | |
1797 | init_rcu_head_on_stack(&rh2); | |
1798 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1799 | ||
1800 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1801 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1802 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1803 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1804 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1805 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1806 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1807 | local_irq_enable(); | |
1808 | rcu_read_unlock(); | |
1809 | preempt_enable(); | |
1810 | ||
1811 | /* Wait for them all to get done so we can safely return. */ | |
1812 | rcu_barrier(); | |
1813 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1814 | destroy_rcu_head_on_stack(&rh1); | |
1815 | destroy_rcu_head_on_stack(&rh2); | |
1816 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1817 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1818 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1819 | } | |
1820 | ||
6f8bc500 | 1821 | static int __init |
a241ec65 PM |
1822 | rcu_torture_init(void) |
1823 | { | |
1824 | int i; | |
1825 | int cpu; | |
1826 | int firsterr = 0; | |
fae4b54f | 1827 | int retval; |
2ec1f2d9 PM |
1828 | static struct rcu_torture_ops *torture_ops[] = { |
1829 | &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, | |
1830 | }; | |
a241ec65 | 1831 | |
343e9099 PM |
1832 | mutex_lock(&fullstop_mutex); |
1833 | ||
a241ec65 | 1834 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1835 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1836 | cur_ops = torture_ops[i]; |
ade5fb81 | 1837 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1838 | break; |
72e9bb54 | 1839 | } |
ade5fb81 | 1840 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
1841 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
1842 | torture_type); | |
1843 | pr_alert("rcu-torture types:"); | |
cf886c44 | 1844 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
1845 | pr_alert(" %s", torture_ops[i]->name); |
1846 | pr_alert("\n"); | |
343e9099 | 1847 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 1848 | return -EINVAL; |
72e9bb54 | 1849 | } |
bf66f18e | 1850 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 1851 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
1852 | fqs_duration = 0; |
1853 | } | |
c8e5b163 | 1854 | if (cur_ops->init) |
72e9bb54 PM |
1855 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1856 | ||
a241ec65 PM |
1857 | if (nreaders >= 0) |
1858 | nrealreaders = nreaders; | |
1859 | else | |
1860 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 1861 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 1862 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
1863 | |
1864 | /* Set up the freelist. */ | |
1865 | ||
1866 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1867 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1868 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1869 | list_add_tail(&rcu_tortures[i].rtort_free, |
1870 | &rcu_torture_freelist); | |
1871 | } | |
1872 | ||
1873 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1874 | ||
1875 | rcu_torture_current = NULL; | |
1876 | rcu_torture_current_version = 0; | |
1877 | atomic_set(&n_rcu_torture_alloc, 0); | |
1878 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1879 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1880 | atomic_set(&n_rcu_torture_mberror, 0); |
1881 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1882 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1883 | n_rcu_torture_boost_ktrerror = 0; |
1884 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1885 | n_rcu_torture_boost_failure = 0; |
1886 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1887 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1888 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1889 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1890 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1891 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1892 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | /* Start up the kthreads. */ | |
1897 | ||
5ccf60f2 | 1898 | VERBOSE_TOROUT_STRING("Creating rcu_torture_writer task"); |
60f53782 PM |
1899 | writer_task = kthread_create(rcu_torture_writer, NULL, |
1900 | "rcu_torture_writer"); | |
a241ec65 PM |
1901 | if (IS_ERR(writer_task)) { |
1902 | firsterr = PTR_ERR(writer_task); | |
5ccf60f2 | 1903 | VERBOSE_TOROUT_ERRSTRING("Failed to create writer"); |
a241ec65 PM |
1904 | writer_task = NULL; |
1905 | goto unwind; | |
1906 | } | |
60f53782 | 1907 | wake_up_process(writer_task); |
b772e1dd | 1908 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1909 | GFP_KERNEL); |
b772e1dd | 1910 | if (fakewriter_tasks == NULL) { |
5ccf60f2 | 1911 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
b772e1dd JT |
1912 | firsterr = -ENOMEM; |
1913 | goto unwind; | |
1914 | } | |
1915 | for (i = 0; i < nfakewriters; i++) { | |
5ccf60f2 | 1916 | VERBOSE_TOROUT_STRING("Creating rcu_torture_fakewriter task"); |
b772e1dd | 1917 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, |
a71fca58 | 1918 | "rcu_torture_fakewriter"); |
b772e1dd JT |
1919 | if (IS_ERR(fakewriter_tasks[i])) { |
1920 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
5ccf60f2 | 1921 | VERBOSE_TOROUT_ERRSTRING("Failed to create fakewriter"); |
b772e1dd JT |
1922 | fakewriter_tasks[i] = NULL; |
1923 | goto unwind; | |
1924 | } | |
1925 | } | |
2860aaba | 1926 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1927 | GFP_KERNEL); |
1928 | if (reader_tasks == NULL) { | |
5ccf60f2 | 1929 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
1930 | firsterr = -ENOMEM; |
1931 | goto unwind; | |
1932 | } | |
1933 | for (i = 0; i < nrealreaders; i++) { | |
5ccf60f2 | 1934 | VERBOSE_TOROUT_STRING("Creating rcu_torture_reader task"); |
a241ec65 PM |
1935 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, |
1936 | "rcu_torture_reader"); | |
1937 | if (IS_ERR(reader_tasks[i])) { | |
1938 | firsterr = PTR_ERR(reader_tasks[i]); | |
5ccf60f2 | 1939 | VERBOSE_TOROUT_ERRSTRING("Failed to create reader"); |
a241ec65 PM |
1940 | reader_tasks[i] = NULL; |
1941 | goto unwind; | |
1942 | } | |
1943 | } | |
1944 | if (stat_interval > 0) { | |
5ccf60f2 | 1945 | VERBOSE_TOROUT_STRING("Creating rcu_torture_stats task"); |
a241ec65 PM |
1946 | stats_task = kthread_run(rcu_torture_stats, NULL, |
1947 | "rcu_torture_stats"); | |
1948 | if (IS_ERR(stats_task)) { | |
1949 | firsterr = PTR_ERR(stats_task); | |
5ccf60f2 | 1950 | VERBOSE_TOROUT_ERRSTRING("Failed to create stats"); |
a241ec65 PM |
1951 | stats_task = NULL; |
1952 | goto unwind; | |
1953 | } | |
1954 | } | |
d84f5203 SV |
1955 | if (test_no_idle_hz) { |
1956 | rcu_idle_cpu = num_online_cpus() - 1; | |
73d0a4b1 RR |
1957 | |
1958 | if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { | |
1959 | firsterr = -ENOMEM; | |
5ccf60f2 | 1960 | VERBOSE_TOROUT_ERRSTRING("Failed to alloc mask"); |
73d0a4b1 RR |
1961 | goto unwind; |
1962 | } | |
1963 | ||
d84f5203 SV |
1964 | /* Create the shuffler thread */ |
1965 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, | |
1966 | "rcu_torture_shuffle"); | |
1967 | if (IS_ERR(shuffler_task)) { | |
73d0a4b1 | 1968 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 | 1969 | firsterr = PTR_ERR(shuffler_task); |
5ccf60f2 | 1970 | VERBOSE_TOROUT_ERRSTRING("Failed to create shuffler"); |
d84f5203 SV |
1971 | shuffler_task = NULL; |
1972 | goto unwind; | |
1973 | } | |
1974 | } | |
d120f65f PM |
1975 | if (stutter < 0) |
1976 | stutter = 0; | |
1977 | if (stutter) { | |
1978 | /* Create the stutter thread */ | |
1979 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
1980 | "rcu_torture_stutter"); | |
1981 | if (IS_ERR(stutter_task)) { | |
1982 | firsterr = PTR_ERR(stutter_task); | |
5ccf60f2 | 1983 | VERBOSE_TOROUT_ERRSTRING("Failed to create stutter"); |
d120f65f PM |
1984 | stutter_task = NULL; |
1985 | goto unwind; | |
1986 | } | |
1987 | } | |
bf66f18e PM |
1988 | if (fqs_duration < 0) |
1989 | fqs_duration = 0; | |
1990 | if (fqs_duration) { | |
1991 | /* Create the stutter thread */ | |
1992 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
1993 | "rcu_torture_fqs"); | |
1994 | if (IS_ERR(fqs_task)) { | |
1995 | firsterr = PTR_ERR(fqs_task); | |
5ccf60f2 | 1996 | VERBOSE_TOROUT_ERRSTRING("Failed to create fqs"); |
bf66f18e PM |
1997 | fqs_task = NULL; |
1998 | goto unwind; | |
1999 | } | |
2000 | } | |
8e8be45e PM |
2001 | if (test_boost_interval < 1) |
2002 | test_boost_interval = 1; | |
2003 | if (test_boost_duration < 2) | |
2004 | test_boost_duration = 2; | |
2005 | if ((test_boost == 1 && cur_ops->can_boost) || | |
2006 | test_boost == 2) { | |
8e8be45e PM |
2007 | |
2008 | boost_starttime = jiffies + test_boost_interval * HZ; | |
2009 | register_cpu_notifier(&rcutorture_cpu_nb); | |
2010 | for_each_possible_cpu(i) { | |
2011 | if (cpu_is_offline(i)) | |
2012 | continue; /* Heuristic: CPU can go offline. */ | |
2013 | retval = rcutorture_booster_init(i); | |
2014 | if (retval < 0) { | |
2015 | firsterr = retval; | |
2016 | goto unwind; | |
2017 | } | |
2018 | } | |
2019 | } | |
d5f546d8 PM |
2020 | if (shutdown_secs > 0) { |
2021 | shutdown_time = jiffies + shutdown_secs * HZ; | |
60f53782 PM |
2022 | shutdown_task = kthread_create(rcu_torture_shutdown, NULL, |
2023 | "rcu_torture_shutdown"); | |
d5f546d8 PM |
2024 | if (IS_ERR(shutdown_task)) { |
2025 | firsterr = PTR_ERR(shutdown_task); | |
5ccf60f2 | 2026 | VERBOSE_TOROUT_ERRSTRING("Failed to create shutdown"); |
d5f546d8 PM |
2027 | shutdown_task = NULL; |
2028 | goto unwind; | |
2029 | } | |
60f53782 | 2030 | wake_up_process(shutdown_task); |
d5f546d8 | 2031 | } |
37e377d2 PM |
2032 | i = rcu_torture_onoff_init(); |
2033 | if (i != 0) { | |
2034 | firsterr = i; | |
2035 | goto unwind; | |
2036 | } | |
8e8be45e | 2037 | register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d2 PM |
2038 | i = rcu_torture_stall_init(); |
2039 | if (i != 0) { | |
2040 | firsterr = i; | |
2041 | goto unwind; | |
2042 | } | |
fae4b54f PM |
2043 | retval = rcu_torture_barrier_init(); |
2044 | if (retval != 0) { | |
2045 | firsterr = retval; | |
2046 | goto unwind; | |
2047 | } | |
d2818df1 PM |
2048 | if (object_debug) |
2049 | rcu_test_debug_objects(); | |
4a298656 | 2050 | rcutorture_record_test_transition(); |
343e9099 | 2051 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2052 | return 0; |
2053 | ||
2054 | unwind: | |
343e9099 | 2055 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2056 | rcu_torture_cleanup(); |
2057 | return firsterr; | |
2058 | } | |
2059 | ||
2060 | module_init(rcu_torture_init); | |
2061 | module_exit(rcu_torture_cleanup); |