Commit | Line | Data |
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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> |
a241ec65 PM |
51 | |
52 | MODULE_LICENSE("GPL"); | |
5cf05ad7 | 53 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@freedesktop.org>"); |
a241ec65 | 54 | |
4802211c | 55 | static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ |
b772e1dd | 56 | static int nfakewriters = 4; /* # fake writer threads */ |
ab840f7a PM |
57 | static int stat_interval = 60; /* Interval between stats, in seconds. */ |
58 | /* Zero means "only at end of test". */ | |
d8e8ed95 | 59 | static bool verbose; /* Print more debug info. */ |
ab840f7a PM |
60 | static bool test_no_idle_hz = true; |
61 | /* Test RCU support for tickless idle CPUs. */ | |
d120f65f PM |
62 | static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ |
63 | static int stutter = 5; /* Start/stop testing interval (in sec) */ | |
0729fbf3 | 64 | static int irqreader = 1; /* RCU readers from irq (timers). */ |
d5f546d8 PM |
65 | static int fqs_duration; /* Duration of bursts (us), 0 to disable. */ |
66 | static int fqs_holdoff; /* Hold time within burst (us). */ | |
bf66f18e | 67 | static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
fae4b54f | 68 | static int n_barrier_cbs; /* Number of callbacks to test RCU barriers. */ |
d2818df1 | 69 | static int object_debug; /* Test object-debug double call_rcu()?. */ |
b58bdcca | 70 | static int onoff_interval; /* Wait time between CPU hotplugs, 0=disable. */ |
9b9ec9b9 | 71 | static int onoff_holdoff; /* Seconds after boot before CPU hotplugs. */ |
d5f546d8 | 72 | static int shutdown_secs; /* Shutdown time (s). <=0 for no shutdown. */ |
c13f3757 PM |
73 | static int stall_cpu; /* CPU-stall duration (s). 0 for no stall. */ |
74 | static int stall_cpu_holdoff = 10; /* Time to wait until stall (s). */ | |
8e8be45e PM |
75 | static int test_boost = 1; /* Test RCU prio boost: 0=no, 1=maybe, 2=yes. */ |
76 | static int test_boost_interval = 7; /* Interval between boost tests, seconds. */ | |
77 | static int test_boost_duration = 4; /* Duration of each boost test, seconds. */ | |
20d2e428 | 78 | static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
a241ec65 | 79 | |
d6ad6711 | 80 | module_param(nreaders, int, 0444); |
a241ec65 | 81 | MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
d6ad6711 | 82 | module_param(nfakewriters, int, 0444); |
b772e1dd | 83 | MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
3721bc1d | 84 | module_param(stat_interval, int, 0644); |
a241ec65 | 85 | MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
d6ad6711 | 86 | module_param(verbose, bool, 0444); |
a241ec65 | 87 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
d6ad6711 | 88 | module_param(test_no_idle_hz, bool, 0444); |
d84f5203 | 89 | MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
d6ad6711 | 90 | module_param(shuffle_interval, int, 0444); |
d84f5203 | 91 | MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
d120f65f PM |
92 | module_param(stutter, int, 0444); |
93 | MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); | |
0729fbf3 PM |
94 | module_param(irqreader, int, 0444); |
95 | MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); | |
bf66f18e PM |
96 | module_param(fqs_duration, int, 0444); |
97 | MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us)"); | |
98 | module_param(fqs_holdoff, int, 0444); | |
99 | MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); | |
100 | module_param(fqs_stutter, int, 0444); | |
101 | MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); | |
fae4b54f PM |
102 | module_param(n_barrier_cbs, int, 0444); |
103 | MODULE_PARM_DESC(n_barrier_cbs, "# of callbacks/kthreads for barrier testing"); | |
d2818df1 PM |
104 | module_param(object_debug, int, 0444); |
105 | MODULE_PARM_DESC(object_debug, "Enable debug-object double call_rcu() testing"); | |
b58bdcca PM |
106 | module_param(onoff_interval, int, 0444); |
107 | MODULE_PARM_DESC(onoff_interval, "Time between CPU hotplugs (s), 0=disable"); | |
9b9ec9b9 PM |
108 | module_param(onoff_holdoff, int, 0444); |
109 | MODULE_PARM_DESC(onoff_holdoff, "Time after boot before CPU hotplugs (s)"); | |
d5f546d8 PM |
110 | module_param(shutdown_secs, int, 0444); |
111 | MODULE_PARM_DESC(shutdown_secs, "Shutdown time (s), zero to disable."); | |
c13f3757 PM |
112 | module_param(stall_cpu, int, 0444); |
113 | MODULE_PARM_DESC(stall_cpu, "Stall duration (s), zero to disable."); | |
114 | module_param(stall_cpu_holdoff, int, 0444); | |
115 | MODULE_PARM_DESC(stall_cpu_holdoff, "Time to wait before starting stall (s)."); | |
8e8be45e PM |
116 | module_param(test_boost, int, 0444); |
117 | MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
118 | module_param(test_boost_interval, int, 0444); | |
119 | MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); | |
120 | module_param(test_boost_duration, int, 0444); | |
121 | MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); | |
d6ad6711 | 122 | module_param(torture_type, charp, 0444); |
b2896d2e | 123 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
72e9bb54 PM |
124 | |
125 | #define TORTURE_FLAG "-torture:" | |
a241ec65 | 126 | #define PRINTK_STRING(s) \ |
2caa1e44 | 127 | do { pr_alert("%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 128 | #define VERBOSE_PRINTK_STRING(s) \ |
2caa1e44 | 129 | do { if (verbose) pr_alert("%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 130 | #define VERBOSE_PRINTK_ERRSTRING(s) \ |
2caa1e44 | 131 | do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) |
a241ec65 PM |
132 | |
133 | static char printk_buf[4096]; | |
134 | ||
135 | static int nrealreaders; | |
136 | static struct task_struct *writer_task; | |
b772e1dd | 137 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
138 | static struct task_struct **reader_tasks; |
139 | static struct task_struct *stats_task; | |
d84f5203 | 140 | static struct task_struct *shuffler_task; |
d120f65f | 141 | static struct task_struct *stutter_task; |
bf66f18e | 142 | static struct task_struct *fqs_task; |
8e8be45e | 143 | static struct task_struct *boost_tasks[NR_CPUS]; |
d5f546d8 | 144 | static struct task_struct *shutdown_task; |
b58bdcca PM |
145 | #ifdef CONFIG_HOTPLUG_CPU |
146 | static struct task_struct *onoff_task; | |
147 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
c13f3757 | 148 | static struct task_struct *stall_task; |
fae4b54f PM |
149 | static struct task_struct **barrier_cbs_tasks; |
150 | static struct task_struct *barrier_task; | |
a241ec65 PM |
151 | |
152 | #define RCU_TORTURE_PIPE_LEN 10 | |
153 | ||
154 | struct rcu_torture { | |
155 | struct rcu_head rtort_rcu; | |
156 | int rtort_pipe_count; | |
157 | struct list_head rtort_free; | |
996417d2 | 158 | int rtort_mbtest; |
a241ec65 PM |
159 | }; |
160 | ||
a241ec65 | 161 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 162 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 163 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
164 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
165 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
166 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = | |
167 | { 0 }; | |
168 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = | |
169 | { 0 }; | |
170 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; | |
b2896d2e PM |
171 | static atomic_t n_rcu_torture_alloc; |
172 | static atomic_t n_rcu_torture_alloc_fail; | |
173 | static atomic_t n_rcu_torture_free; | |
174 | static atomic_t n_rcu_torture_mberror; | |
175 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 176 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
177 | static long n_rcu_torture_boost_ktrerror; |
178 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
179 | static long n_rcu_torture_boost_failure; |
180 | static long n_rcu_torture_boosts; | |
a71fca58 | 181 | static long n_rcu_torture_timers; |
b58bdcca PM |
182 | static long n_offline_attempts; |
183 | static long n_offline_successes; | |
13dbf914 PM |
184 | static unsigned long sum_offline; |
185 | static int min_offline = -1; | |
186 | static int max_offline; | |
b58bdcca PM |
187 | static long n_online_attempts; |
188 | static long n_online_successes; | |
13dbf914 PM |
189 | static unsigned long sum_online; |
190 | static int min_online = -1; | |
191 | static int max_online; | |
fae4b54f PM |
192 | static long n_barrier_attempts; |
193 | static long n_barrier_successes; | |
e3033736 | 194 | static struct list_head rcu_torture_removed; |
73d0a4b1 | 195 | static cpumask_var_t shuffle_tmp_mask; |
a241ec65 | 196 | |
a71fca58 | 197 | static int stutter_pause_test; |
d120f65f | 198 | |
31a72bce PM |
199 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
200 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
201 | #else | |
202 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
203 | #endif | |
204 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
205 | module_param(rcutorture_runnable, int, 0444); |
206 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 207 | |
3acf4a9a | 208 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 209 | #define rcu_can_boost() 1 |
3acf4a9a | 210 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 211 | #define rcu_can_boost() 0 |
3acf4a9a | 212 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 213 | |
e4aa0da3 SR |
214 | #ifdef CONFIG_RCU_TRACE |
215 | static u64 notrace rcu_trace_clock_local(void) | |
216 | { | |
217 | u64 ts = trace_clock_local(); | |
218 | unsigned long __maybe_unused ts_rem = do_div(ts, NSEC_PER_USEC); | |
219 | return ts; | |
220 | } | |
221 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
222 | static u64 notrace rcu_trace_clock_local(void) | |
223 | { | |
224 | return 0ULL; | |
225 | } | |
226 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
227 | ||
d5f546d8 | 228 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
229 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
230 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
231 | /* and boost task create/destroy. */ | |
fae4b54f | 232 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 233 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
234 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
235 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
236 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 237 | |
c9d557c1 PM |
238 | /* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ |
239 | ||
240 | #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ | |
241 | #define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ | |
242 | #define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ | |
243 | static int fullstop = FULLSTOP_RMMOD; | |
0ddea0ea PM |
244 | /* |
245 | * Protect fullstop transitions and spawning of kthreads. | |
246 | */ | |
247 | static DEFINE_MUTEX(fullstop_mutex); | |
343e9099 | 248 | |
d5f546d8 PM |
249 | /* Forward reference. */ |
250 | static void rcu_torture_cleanup(void); | |
251 | ||
343e9099 | 252 | /* |
c9d557c1 | 253 | * Detect and respond to a system shutdown. |
343e9099 PM |
254 | */ |
255 | static int | |
256 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
257 | unsigned long unused2, void *unused3) | |
258 | { | |
c59ab97e | 259 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 260 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 261 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 | 262 | else |
2caa1e44 | 263 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 264 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
c59ab97e | 265 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
266 | return NOTIFY_DONE; |
267 | } | |
268 | ||
c9d557c1 PM |
269 | /* |
270 | * Absorb kthreads into a kernel function that won't return, so that | |
271 | * they won't ever access module text or data again. | |
272 | */ | |
e66c33d5 | 273 | static void rcutorture_shutdown_absorb(const char *title) |
c9d557c1 PM |
274 | { |
275 | if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { | |
2caa1e44 | 276 | pr_notice( |
c9d557c1 PM |
277 | "rcutorture thread %s parking due to system shutdown\n", |
278 | title); | |
279 | schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); | |
280 | } | |
281 | } | |
282 | ||
a241ec65 PM |
283 | /* |
284 | * Allocate an element from the rcu_tortures pool. | |
285 | */ | |
97a41e26 | 286 | static struct rcu_torture * |
a241ec65 PM |
287 | rcu_torture_alloc(void) |
288 | { | |
289 | struct list_head *p; | |
290 | ||
adac1665 | 291 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
292 | if (list_empty(&rcu_torture_freelist)) { |
293 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 294 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
295 | return NULL; |
296 | } | |
297 | atomic_inc(&n_rcu_torture_alloc); | |
298 | p = rcu_torture_freelist.next; | |
299 | list_del_init(p); | |
adac1665 | 300 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
301 | return container_of(p, struct rcu_torture, rtort_free); |
302 | } | |
303 | ||
304 | /* | |
305 | * Free an element to the rcu_tortures pool. | |
306 | */ | |
307 | static void | |
308 | rcu_torture_free(struct rcu_torture *p) | |
309 | { | |
310 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 311 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 312 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 313 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
314 | } |
315 | ||
a241ec65 PM |
316 | struct rcu_random_state { |
317 | unsigned long rrs_state; | |
75cfef32 | 318 | long rrs_count; |
a241ec65 PM |
319 | }; |
320 | ||
321 | #define RCU_RANDOM_MULT 39916801 /* prime */ | |
322 | #define RCU_RANDOM_ADD 479001701 /* prime */ | |
323 | #define RCU_RANDOM_REFRESH 10000 | |
324 | ||
325 | #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } | |
326 | ||
327 | /* | |
328 | * Crude but fast random-number generator. Uses a linear congruential | |
c17ac855 | 329 | * generator, with occasional help from cpu_clock(). |
a241ec65 | 330 | */ |
75cfef32 | 331 | static unsigned long |
a241ec65 PM |
332 | rcu_random(struct rcu_random_state *rrsp) |
333 | { | |
a241ec65 | 334 | if (--rrsp->rrs_count < 0) { |
c676329a | 335 | rrsp->rrs_state += (unsigned long)local_clock(); |
a241ec65 PM |
336 | rrsp->rrs_count = RCU_RANDOM_REFRESH; |
337 | } | |
338 | rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; | |
339 | return swahw32(rrsp->rrs_state); | |
340 | } | |
341 | ||
d120f65f | 342 | static void |
e66c33d5 | 343 | rcu_stutter_wait(const char *title) |
d120f65f | 344 | { |
c9d557c1 | 345 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
346 | if (rcutorture_runnable) |
347 | schedule_timeout_interruptible(1); | |
348 | else | |
3ccf79f4 | 349 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
c9d557c1 | 350 | rcutorture_shutdown_absorb(title); |
343e9099 | 351 | } |
d120f65f PM |
352 | } |
353 | ||
72e9bb54 PM |
354 | /* |
355 | * Operations vector for selecting different types of tests. | |
356 | */ | |
357 | ||
358 | struct rcu_torture_ops { | |
359 | void (*init)(void); | |
72e9bb54 | 360 | int (*readlock)(void); |
0acc512c | 361 | void (*read_delay)(struct rcu_random_state *rrsp); |
72e9bb54 PM |
362 | void (*readunlock)(int idx); |
363 | int (*completed)(void); | |
0acc512c | 364 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 365 | void (*sync)(void); |
fae4b54f | 366 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 367 | void (*cb_barrier)(void); |
bf66f18e | 368 | void (*fqs)(void); |
72e9bb54 | 369 | int (*stats)(char *page); |
0acc512c | 370 | int irq_capable; |
8e8be45e | 371 | int can_boost; |
e66c33d5 | 372 | const char *name; |
72e9bb54 | 373 | }; |
a71fca58 PM |
374 | |
375 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
376 | |
377 | /* | |
378 | * Definitions for rcu torture testing. | |
379 | */ | |
380 | ||
a49a4af7 | 381 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
382 | { |
383 | rcu_read_lock(); | |
384 | return 0; | |
385 | } | |
386 | ||
b2896d2e PM |
387 | static void rcu_read_delay(struct rcu_random_state *rrsp) |
388 | { | |
b8d57a76 JT |
389 | const unsigned long shortdelay_us = 200; |
390 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 391 | |
b8d57a76 JT |
392 | /* We want a short delay sometimes to make a reader delay the grace |
393 | * period, and we want a long delay occasionally to trigger | |
394 | * force_quiescent_state. */ | |
b2896d2e | 395 | |
b8d57a76 JT |
396 | if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
397 | mdelay(longdelay_ms); | |
398 | if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) | |
399 | udelay(shortdelay_us); | |
e546f485 LJ |
400 | #ifdef CONFIG_PREEMPT |
401 | if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) | |
402 | preempt_schedule(); /* No QS if preempt_disable() in effect */ | |
403 | #endif | |
b2896d2e PM |
404 | } |
405 | ||
a49a4af7 | 406 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
407 | { |
408 | rcu_read_unlock(); | |
409 | } | |
410 | ||
411 | static int rcu_torture_completed(void) | |
412 | { | |
413 | return rcu_batches_completed(); | |
414 | } | |
415 | ||
416 | static void | |
417 | rcu_torture_cb(struct rcu_head *p) | |
418 | { | |
419 | int i; | |
420 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
421 | ||
c9d557c1 | 422 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
423 | /* Test is ending, just drop callbacks on the floor. */ |
424 | /* The next initialization will pick up the pieces. */ | |
425 | return; | |
426 | } | |
427 | i = rp->rtort_pipe_count; | |
428 | if (i > RCU_TORTURE_PIPE_LEN) | |
429 | i = RCU_TORTURE_PIPE_LEN; | |
430 | atomic_inc(&rcu_torture_wcount[i]); | |
431 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
432 | rp->rtort_mbtest = 0; | |
433 | rcu_torture_free(rp); | |
c701d5d9 | 434 | } else { |
0acc512c | 435 | cur_ops->deferred_free(rp); |
c701d5d9 | 436 | } |
72e9bb54 PM |
437 | } |
438 | ||
d9a3da06 PM |
439 | static int rcu_no_completed(void) |
440 | { | |
441 | return 0; | |
442 | } | |
443 | ||
72e9bb54 PM |
444 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
445 | { | |
446 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
447 | } | |
448 | ||
449 | static struct rcu_torture_ops rcu_ops = { | |
0acc512c | 450 | .init = NULL, |
0acc512c PM |
451 | .readlock = rcu_torture_read_lock, |
452 | .read_delay = rcu_read_delay, | |
453 | .readunlock = rcu_torture_read_unlock, | |
454 | .completed = rcu_torture_completed, | |
455 | .deferred_free = rcu_torture_deferred_free, | |
456 | .sync = synchronize_rcu, | |
fae4b54f | 457 | .call = call_rcu, |
0acc512c | 458 | .cb_barrier = rcu_barrier, |
bf66f18e | 459 | .fqs = rcu_force_quiescent_state, |
0acc512c | 460 | .stats = NULL, |
a71fca58 | 461 | .irq_capable = 1, |
8e8be45e | 462 | .can_boost = rcu_can_boost(), |
a71fca58 | 463 | .name = "rcu" |
72e9bb54 PM |
464 | }; |
465 | ||
e3033736 JT |
466 | static void rcu_sync_torture_deferred_free(struct rcu_torture *p) |
467 | { | |
468 | int i; | |
469 | struct rcu_torture *rp; | |
470 | struct rcu_torture *rp1; | |
471 | ||
472 | cur_ops->sync(); | |
473 | list_add(&p->rtort_free, &rcu_torture_removed); | |
474 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
475 | i = rp->rtort_pipe_count; | |
476 | if (i > RCU_TORTURE_PIPE_LEN) | |
477 | i = RCU_TORTURE_PIPE_LEN; | |
478 | atomic_inc(&rcu_torture_wcount[i]); | |
479 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
480 | rp->rtort_mbtest = 0; | |
481 | list_del(&rp->rtort_free); | |
482 | rcu_torture_free(rp); | |
483 | } | |
484 | } | |
485 | } | |
486 | ||
487 | static void rcu_sync_torture_init(void) | |
488 | { | |
489 | INIT_LIST_HEAD(&rcu_torture_removed); | |
490 | } | |
491 | ||
20d2e428 | 492 | static struct rcu_torture_ops rcu_sync_ops = { |
0acc512c | 493 | .init = rcu_sync_torture_init, |
0acc512c PM |
494 | .readlock = rcu_torture_read_lock, |
495 | .read_delay = rcu_read_delay, | |
496 | .readunlock = rcu_torture_read_unlock, | |
497 | .completed = rcu_torture_completed, | |
498 | .deferred_free = rcu_sync_torture_deferred_free, | |
499 | .sync = synchronize_rcu, | |
fae4b54f | 500 | .call = NULL, |
0acc512c | 501 | .cb_barrier = NULL, |
bf66f18e | 502 | .fqs = rcu_force_quiescent_state, |
0acc512c PM |
503 | .stats = NULL, |
504 | .irq_capable = 1, | |
8e8be45e | 505 | .can_boost = rcu_can_boost(), |
0acc512c | 506 | .name = "rcu_sync" |
20d2e428 JT |
507 | }; |
508 | ||
d9a3da06 PM |
509 | static struct rcu_torture_ops rcu_expedited_ops = { |
510 | .init = rcu_sync_torture_init, | |
d9a3da06 PM |
511 | .readlock = rcu_torture_read_lock, |
512 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
513 | .readunlock = rcu_torture_read_unlock, | |
514 | .completed = rcu_no_completed, | |
515 | .deferred_free = rcu_sync_torture_deferred_free, | |
516 | .sync = synchronize_rcu_expedited, | |
fae4b54f | 517 | .call = NULL, |
d9a3da06 | 518 | .cb_barrier = NULL, |
bf66f18e | 519 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
520 | .stats = NULL, |
521 | .irq_capable = 1, | |
8e8be45e | 522 | .can_boost = rcu_can_boost(), |
d9a3da06 PM |
523 | .name = "rcu_expedited" |
524 | }; | |
525 | ||
c32e0660 PM |
526 | /* |
527 | * Definitions for rcu_bh torture testing. | |
528 | */ | |
529 | ||
a49a4af7 | 530 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
531 | { |
532 | rcu_read_lock_bh(); | |
533 | return 0; | |
534 | } | |
535 | ||
a49a4af7 | 536 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
537 | { |
538 | rcu_read_unlock_bh(); | |
539 | } | |
540 | ||
541 | static int rcu_bh_torture_completed(void) | |
542 | { | |
543 | return rcu_batches_completed_bh(); | |
544 | } | |
545 | ||
546 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
547 | { | |
548 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
549 | } | |
550 | ||
551 | static struct rcu_torture_ops rcu_bh_ops = { | |
0acc512c | 552 | .init = NULL, |
0acc512c PM |
553 | .readlock = rcu_bh_torture_read_lock, |
554 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
555 | .readunlock = rcu_bh_torture_read_unlock, | |
556 | .completed = rcu_bh_torture_completed, | |
557 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 558 | .sync = synchronize_rcu_bh, |
fae4b54f | 559 | .call = call_rcu_bh, |
0acc512c | 560 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 561 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
562 | .stats = NULL, |
563 | .irq_capable = 1, | |
564 | .name = "rcu_bh" | |
c32e0660 PM |
565 | }; |
566 | ||
11a14701 | 567 | static struct rcu_torture_ops rcu_bh_sync_ops = { |
0acc512c | 568 | .init = rcu_sync_torture_init, |
0acc512c PM |
569 | .readlock = rcu_bh_torture_read_lock, |
570 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
571 | .readunlock = rcu_bh_torture_read_unlock, | |
572 | .completed = rcu_bh_torture_completed, | |
573 | .deferred_free = rcu_sync_torture_deferred_free, | |
bdf2a436 | 574 | .sync = synchronize_rcu_bh, |
fae4b54f | 575 | .call = NULL, |
0acc512c | 576 | .cb_barrier = NULL, |
bf66f18e | 577 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
578 | .stats = NULL, |
579 | .irq_capable = 1, | |
580 | .name = "rcu_bh_sync" | |
11a14701 JT |
581 | }; |
582 | ||
bdf2a436 PM |
583 | static struct rcu_torture_ops rcu_bh_expedited_ops = { |
584 | .init = rcu_sync_torture_init, | |
bdf2a436 PM |
585 | .readlock = rcu_bh_torture_read_lock, |
586 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
587 | .readunlock = rcu_bh_torture_read_unlock, | |
588 | .completed = rcu_bh_torture_completed, | |
589 | .deferred_free = rcu_sync_torture_deferred_free, | |
590 | .sync = synchronize_rcu_bh_expedited, | |
fae4b54f | 591 | .call = NULL, |
bdf2a436 PM |
592 | .cb_barrier = NULL, |
593 | .fqs = rcu_bh_force_quiescent_state, | |
594 | .stats = NULL, | |
595 | .irq_capable = 1, | |
596 | .name = "rcu_bh_expedited" | |
597 | }; | |
598 | ||
b2896d2e PM |
599 | /* |
600 | * Definitions for srcu torture testing. | |
601 | */ | |
602 | ||
cda4dc81 | 603 | DEFINE_STATIC_SRCU(srcu_ctl); |
b2896d2e | 604 | |
012d3ca8 | 605 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
606 | { |
607 | return srcu_read_lock(&srcu_ctl); | |
608 | } | |
609 | ||
610 | static void srcu_read_delay(struct rcu_random_state *rrsp) | |
611 | { | |
612 | long delay; | |
613 | const long uspertick = 1000000 / HZ; | |
614 | const long longdelay = 10; | |
615 | ||
616 | /* We want there to be long-running readers, but not all the time. */ | |
617 | ||
618 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); | |
619 | if (!delay) | |
620 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
621 | else |
622 | rcu_read_delay(rrsp); | |
b2896d2e PM |
623 | } |
624 | ||
012d3ca8 | 625 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
626 | { |
627 | srcu_read_unlock(&srcu_ctl, idx); | |
628 | } | |
629 | ||
630 | static int srcu_torture_completed(void) | |
631 | { | |
632 | return srcu_batches_completed(&srcu_ctl); | |
633 | } | |
634 | ||
9059c940 LJ |
635 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
636 | { | |
637 | call_srcu(&srcu_ctl, &rp->rtort_rcu, rcu_torture_cb); | |
638 | } | |
639 | ||
b772e1dd JT |
640 | static void srcu_torture_synchronize(void) |
641 | { | |
642 | synchronize_srcu(&srcu_ctl); | |
643 | } | |
644 | ||
e3f8d378 PM |
645 | static void srcu_torture_call(struct rcu_head *head, |
646 | void (*func)(struct rcu_head *head)) | |
647 | { | |
648 | call_srcu(&srcu_ctl, head, func); | |
649 | } | |
650 | ||
651 | static void srcu_torture_barrier(void) | |
652 | { | |
653 | srcu_barrier(&srcu_ctl); | |
654 | } | |
655 | ||
b2896d2e PM |
656 | static int srcu_torture_stats(char *page) |
657 | { | |
658 | int cnt = 0; | |
659 | int cpu; | |
660 | int idx = srcu_ctl.completed & 0x1; | |
661 | ||
662 | cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", | |
663 | torture_type, TORTURE_FLAG, idx); | |
664 | for_each_possible_cpu(cpu) { | |
cef50120 | 665 | cnt += sprintf(&page[cnt], " %d(%lu,%lu)", cpu, |
b2896d2e PM |
666 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
667 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
668 | } | |
669 | cnt += sprintf(&page[cnt], "\n"); | |
670 | return cnt; | |
671 | } | |
672 | ||
673 | static struct rcu_torture_ops srcu_ops = { | |
cda4dc81 | 674 | .init = rcu_sync_torture_init, |
0acc512c PM |
675 | .readlock = srcu_torture_read_lock, |
676 | .read_delay = srcu_read_delay, | |
677 | .readunlock = srcu_torture_read_unlock, | |
678 | .completed = srcu_torture_completed, | |
9059c940 | 679 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 680 | .sync = srcu_torture_synchronize, |
e3f8d378 PM |
681 | .call = srcu_torture_call, |
682 | .cb_barrier = srcu_torture_barrier, | |
0acc512c PM |
683 | .stats = srcu_torture_stats, |
684 | .name = "srcu" | |
b2896d2e PM |
685 | }; |
686 | ||
9059c940 | 687 | static struct rcu_torture_ops srcu_sync_ops = { |
cda4dc81 | 688 | .init = rcu_sync_torture_init, |
9059c940 LJ |
689 | .readlock = srcu_torture_read_lock, |
690 | .read_delay = srcu_read_delay, | |
691 | .readunlock = srcu_torture_read_unlock, | |
692 | .completed = srcu_torture_completed, | |
693 | .deferred_free = rcu_sync_torture_deferred_free, | |
694 | .sync = srcu_torture_synchronize, | |
695 | .call = NULL, | |
696 | .cb_barrier = NULL, | |
697 | .stats = srcu_torture_stats, | |
698 | .name = "srcu_sync" | |
699 | }; | |
700 | ||
804bb837 PM |
701 | static void srcu_torture_synchronize_expedited(void) |
702 | { | |
703 | synchronize_srcu_expedited(&srcu_ctl); | |
704 | } | |
705 | ||
706 | static struct rcu_torture_ops srcu_expedited_ops = { | |
cda4dc81 | 707 | .init = rcu_sync_torture_init, |
804bb837 PM |
708 | .readlock = srcu_torture_read_lock, |
709 | .read_delay = srcu_read_delay, | |
710 | .readunlock = srcu_torture_read_unlock, | |
711 | .completed = srcu_torture_completed, | |
712 | .deferred_free = rcu_sync_torture_deferred_free, | |
713 | .sync = srcu_torture_synchronize_expedited, | |
fae4b54f | 714 | .call = NULL, |
804bb837 PM |
715 | .cb_barrier = NULL, |
716 | .stats = srcu_torture_stats, | |
717 | .name = "srcu_expedited" | |
718 | }; | |
719 | ||
4b6c2cca JT |
720 | /* |
721 | * Definitions for sched torture testing. | |
722 | */ | |
723 | ||
724 | static int sched_torture_read_lock(void) | |
725 | { | |
726 | preempt_disable(); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static void sched_torture_read_unlock(int idx) | |
731 | { | |
732 | preempt_enable(); | |
733 | } | |
734 | ||
2326974d PM |
735 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
736 | { | |
737 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
738 | } | |
739 | ||
4b6c2cca | 740 | static struct rcu_torture_ops sched_ops = { |
0acc512c | 741 | .init = rcu_sync_torture_init, |
0acc512c PM |
742 | .readlock = sched_torture_read_lock, |
743 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
744 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 745 | .completed = rcu_no_completed, |
0acc512c | 746 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 747 | .sync = synchronize_sched, |
0acc512c | 748 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 749 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
750 | .stats = NULL, |
751 | .irq_capable = 1, | |
752 | .name = "sched" | |
4b6c2cca JT |
753 | }; |
754 | ||
804bb837 | 755 | static struct rcu_torture_ops sched_sync_ops = { |
0acc512c | 756 | .init = rcu_sync_torture_init, |
0acc512c PM |
757 | .readlock = sched_torture_read_lock, |
758 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
759 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 760 | .completed = rcu_no_completed, |
0acc512c | 761 | .deferred_free = rcu_sync_torture_deferred_free, |
bdf2a436 | 762 | .sync = synchronize_sched, |
0acc512c | 763 | .cb_barrier = NULL, |
bf66f18e | 764 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
765 | .stats = NULL, |
766 | .name = "sched_sync" | |
767 | }; | |
768 | ||
0acc512c PM |
769 | static struct rcu_torture_ops sched_expedited_ops = { |
770 | .init = rcu_sync_torture_init, | |
0acc512c PM |
771 | .readlock = sched_torture_read_lock, |
772 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
773 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 774 | .completed = rcu_no_completed, |
0acc512c PM |
775 | .deferred_free = rcu_sync_torture_deferred_free, |
776 | .sync = synchronize_sched_expedited, | |
777 | .cb_barrier = NULL, | |
bf66f18e | 778 | .fqs = rcu_sched_force_quiescent_state, |
969c7921 | 779 | .stats = NULL, |
0acc512c PM |
780 | .irq_capable = 1, |
781 | .name = "sched_expedited" | |
2326974d PM |
782 | }; |
783 | ||
8e8be45e PM |
784 | /* |
785 | * RCU torture priority-boost testing. Runs one real-time thread per | |
786 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
787 | * spinning waiting for them to be invoked. If a given callback takes | |
788 | * too long to be invoked, we assume that priority inversion has occurred. | |
789 | */ | |
790 | ||
791 | struct rcu_boost_inflight { | |
792 | struct rcu_head rcu; | |
793 | int inflight; | |
794 | }; | |
795 | ||
796 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
797 | { | |
798 | struct rcu_boost_inflight *rbip = | |
799 | container_of(head, struct rcu_boost_inflight, rcu); | |
800 | ||
801 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
802 | rbip->inflight = 0; | |
803 | } | |
804 | ||
805 | static int rcu_torture_boost(void *arg) | |
806 | { | |
807 | unsigned long call_rcu_time; | |
808 | unsigned long endtime; | |
809 | unsigned long oldstarttime; | |
810 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
811 | struct sched_param sp; | |
812 | ||
813 | VERBOSE_PRINTK_STRING("rcu_torture_boost started"); | |
814 | ||
815 | /* Set real-time priority. */ | |
816 | sp.sched_priority = 1; | |
817 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
818 | VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); | |
819 | n_rcu_torture_boost_rterror++; | |
820 | } | |
821 | ||
561190e3 | 822 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
823 | /* Each pass through the following loop does one boost-test cycle. */ |
824 | do { | |
825 | /* Wait for the next test interval. */ | |
826 | oldstarttime = boost_starttime; | |
93898fb1 | 827 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 828 | schedule_timeout_interruptible(oldstarttime - jiffies); |
8e8be45e PM |
829 | rcu_stutter_wait("rcu_torture_boost"); |
830 | if (kthread_should_stop() || | |
831 | fullstop != FULLSTOP_DONTSTOP) | |
832 | goto checkwait; | |
833 | } | |
834 | ||
835 | /* Do one boost-test interval. */ | |
836 | endtime = oldstarttime + test_boost_duration * HZ; | |
837 | call_rcu_time = jiffies; | |
93898fb1 | 838 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
839 | /* If we don't have a callback in flight, post one. */ |
840 | if (!rbi.inflight) { | |
841 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
842 | rbi.inflight = 1; | |
843 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
844 | if (jiffies - call_rcu_time > | |
845 | test_boost_duration * HZ - HZ / 2) { | |
846 | VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); | |
847 | n_rcu_torture_boost_failure++; | |
848 | } | |
849 | call_rcu_time = jiffies; | |
850 | } | |
851 | cond_resched(); | |
852 | rcu_stutter_wait("rcu_torture_boost"); | |
853 | if (kthread_should_stop() || | |
854 | fullstop != FULLSTOP_DONTSTOP) | |
855 | goto checkwait; | |
856 | } | |
857 | ||
858 | /* | |
859 | * Set the start time of the next test interval. | |
860 | * Yes, this is vulnerable to long delays, but such | |
861 | * delays simply cause a false negative for the next | |
862 | * interval. Besides, we are running at RT priority, | |
863 | * so delays should be relatively rare. | |
864 | */ | |
ab8f11e5 PM |
865 | while (oldstarttime == boost_starttime && |
866 | !kthread_should_stop()) { | |
8e8be45e PM |
867 | if (mutex_trylock(&boost_mutex)) { |
868 | boost_starttime = jiffies + | |
869 | test_boost_interval * HZ; | |
870 | n_rcu_torture_boosts++; | |
871 | mutex_unlock(&boost_mutex); | |
872 | break; | |
873 | } | |
874 | schedule_timeout_uninterruptible(1); | |
875 | } | |
876 | ||
877 | /* Go do the stutter. */ | |
878 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
879 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
880 | ||
881 | /* Clean up and exit. */ | |
882 | VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); | |
883 | rcutorture_shutdown_absorb("rcu_torture_boost"); | |
884 | while (!kthread_should_stop() || rbi.inflight) | |
885 | schedule_timeout_uninterruptible(1); | |
886 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 887 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
888 | return 0; |
889 | } | |
890 | ||
bf66f18e PM |
891 | /* |
892 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
893 | * bursts of calls to force_quiescent_state(), increasing the probability | |
894 | * of occurrence of some important types of race conditions. | |
895 | */ | |
896 | static int | |
897 | rcu_torture_fqs(void *arg) | |
898 | { | |
899 | unsigned long fqs_resume_time; | |
900 | int fqs_burst_remaining; | |
901 | ||
902 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); | |
903 | do { | |
904 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
905 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
906 | !kthread_should_stop()) { | |
bf66f18e PM |
907 | schedule_timeout_interruptible(1); |
908 | } | |
909 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
910 | while (fqs_burst_remaining > 0 && |
911 | !kthread_should_stop()) { | |
bf66f18e PM |
912 | cur_ops->fqs(); |
913 | udelay(fqs_holdoff); | |
914 | fqs_burst_remaining -= fqs_holdoff; | |
915 | } | |
916 | rcu_stutter_wait("rcu_torture_fqs"); | |
917 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
918 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); | |
919 | rcutorture_shutdown_absorb("rcu_torture_fqs"); | |
920 | while (!kthread_should_stop()) | |
921 | schedule_timeout_uninterruptible(1); | |
922 | return 0; | |
923 | } | |
924 | ||
a241ec65 PM |
925 | /* |
926 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
927 | * for that pointed to by rcu_torture_current, freeing the old structure | |
928 | * after a series of grace periods (the "pipeline"). | |
929 | */ | |
930 | static int | |
931 | rcu_torture_writer(void *arg) | |
932 | { | |
933 | int i; | |
934 | long oldbatch = rcu_batches_completed(); | |
935 | struct rcu_torture *rp; | |
936 | struct rcu_torture *old_rp; | |
937 | static DEFINE_RCU_RANDOM(rand); | |
938 | ||
939 | VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); | |
dbdf65b1 IM |
940 | set_user_nice(current, 19); |
941 | ||
a241ec65 PM |
942 | do { |
943 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
944 | rp = rcu_torture_alloc(); |
945 | if (rp == NULL) | |
a241ec65 PM |
946 | continue; |
947 | rp->rtort_pipe_count = 0; | |
948 | udelay(rcu_random(&rand) & 0x3ff); | |
0ddea0ea PM |
949 | old_rp = rcu_dereference_check(rcu_torture_current, |
950 | current == writer_task); | |
996417d2 | 951 | rp->rtort_mbtest = 1; |
a241ec65 | 952 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 953 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 954 | if (old_rp) { |
a241ec65 PM |
955 | i = old_rp->rtort_pipe_count; |
956 | if (i > RCU_TORTURE_PIPE_LEN) | |
957 | i = RCU_TORTURE_PIPE_LEN; | |
958 | atomic_inc(&rcu_torture_wcount[i]); | |
959 | old_rp->rtort_pipe_count++; | |
0acc512c | 960 | cur_ops->deferred_free(old_rp); |
a241ec65 | 961 | } |
4a298656 | 962 | rcutorture_record_progress(++rcu_torture_current_version); |
72e9bb54 | 963 | oldbatch = cur_ops->completed(); |
c9d557c1 PM |
964 | rcu_stutter_wait("rcu_torture_writer"); |
965 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 966 | VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c1 PM |
967 | rcutorture_shutdown_absorb("rcu_torture_writer"); |
968 | while (!kthread_should_stop()) | |
a241ec65 PM |
969 | schedule_timeout_uninterruptible(1); |
970 | return 0; | |
971 | } | |
972 | ||
b772e1dd JT |
973 | /* |
974 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
975 | * delay between calls. | |
976 | */ | |
977 | static int | |
978 | rcu_torture_fakewriter(void *arg) | |
979 | { | |
980 | DEFINE_RCU_RANDOM(rand); | |
981 | ||
982 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); | |
983 | set_user_nice(current, 19); | |
984 | ||
985 | do { | |
986 | schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); | |
987 | udelay(rcu_random(&rand) & 0x3ff); | |
72472a02 PM |
988 | if (cur_ops->cb_barrier != NULL && |
989 | rcu_random(&rand) % (nfakewriters * 8) == 0) | |
990 | cur_ops->cb_barrier(); | |
991 | else | |
992 | cur_ops->sync(); | |
c9d557c1 PM |
993 | rcu_stutter_wait("rcu_torture_fakewriter"); |
994 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd JT |
995 | |
996 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); | |
c9d557c1 PM |
997 | rcutorture_shutdown_absorb("rcu_torture_fakewriter"); |
998 | while (!kthread_should_stop()) | |
b772e1dd JT |
999 | schedule_timeout_uninterruptible(1); |
1000 | return 0; | |
1001 | } | |
1002 | ||
91afaf30 PM |
1003 | void rcutorture_trace_dump(void) |
1004 | { | |
1005 | static atomic_t beenhere = ATOMIC_INIT(0); | |
1006 | ||
1007 | if (atomic_read(&beenhere)) | |
1008 | return; | |
1009 | if (atomic_xchg(&beenhere, 1) != 0) | |
1010 | return; | |
91afaf30 PM |
1011 | ftrace_dump(DUMP_ALL); |
1012 | } | |
1013 | ||
0729fbf3 PM |
1014 | /* |
1015 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1016 | * incrementing the corresponding element of the pipeline array. The | |
1017 | * counter in the element should never be greater than 1, otherwise, the | |
1018 | * RCU implementation is broken. | |
1019 | */ | |
1020 | static void rcu_torture_timer(unsigned long unused) | |
1021 | { | |
1022 | int idx; | |
1023 | int completed; | |
52494535 | 1024 | int completed_end; |
0729fbf3 PM |
1025 | static DEFINE_RCU_RANDOM(rand); |
1026 | static DEFINE_SPINLOCK(rand_lock); | |
1027 | struct rcu_torture *p; | |
1028 | int pipe_count; | |
52494535 | 1029 | unsigned long long ts; |
0729fbf3 PM |
1030 | |
1031 | idx = cur_ops->readlock(); | |
1032 | completed = cur_ops->completed(); | |
e4aa0da3 | 1033 | ts = rcu_trace_clock_local(); |
632ee200 | 1034 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1035 | rcu_read_lock_bh_held() || |
1036 | rcu_read_lock_sched_held() || | |
1037 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
1038 | if (p == NULL) { |
1039 | /* Leave because rcu_torture_writer is not yet underway */ | |
1040 | cur_ops->readunlock(idx); | |
1041 | return; | |
1042 | } | |
1043 | if (p->rtort_mbtest == 0) | |
1044 | atomic_inc(&n_rcu_torture_mberror); | |
1045 | spin_lock(&rand_lock); | |
0acc512c | 1046 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1047 | n_rcu_torture_timers++; |
1048 | spin_unlock(&rand_lock); | |
1049 | preempt_disable(); | |
1050 | pipe_count = p->rtort_pipe_count; | |
1051 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1052 | /* Should not happen, but... */ | |
1053 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1054 | } | |
52494535 PM |
1055 | completed_end = cur_ops->completed(); |
1056 | if (pipe_count > 1) { | |
52494535 PM |
1057 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts, |
1058 | completed, completed_end); | |
91afaf30 | 1059 | rcutorture_trace_dump(); |
52494535 | 1060 | } |
dd17c8f7 | 1061 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 1062 | completed = completed_end - completed; |
0729fbf3 PM |
1063 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1064 | /* Should not happen, but... */ | |
1065 | completed = RCU_TORTURE_PIPE_LEN; | |
1066 | } | |
dd17c8f7 | 1067 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1068 | preempt_enable(); |
1069 | cur_ops->readunlock(idx); | |
1070 | } | |
1071 | ||
a241ec65 PM |
1072 | /* |
1073 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1074 | * incrementing the corresponding element of the pipeline array. The | |
1075 | * counter in the element should never be greater than 1, otherwise, the | |
1076 | * RCU implementation is broken. | |
1077 | */ | |
1078 | static int | |
1079 | rcu_torture_reader(void *arg) | |
1080 | { | |
1081 | int completed; | |
52494535 | 1082 | int completed_end; |
72e9bb54 | 1083 | int idx; |
a241ec65 PM |
1084 | DEFINE_RCU_RANDOM(rand); |
1085 | struct rcu_torture *p; | |
1086 | int pipe_count; | |
0729fbf3 | 1087 | struct timer_list t; |
52494535 | 1088 | unsigned long long ts; |
a241ec65 PM |
1089 | |
1090 | VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); | |
dbdf65b1 | 1091 | set_user_nice(current, 19); |
0acc512c | 1092 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1093 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1094 | |
a241ec65 | 1095 | do { |
0acc512c | 1096 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1097 | if (!timer_pending(&t)) |
6155fec9 | 1098 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1099 | } |
72e9bb54 PM |
1100 | idx = cur_ops->readlock(); |
1101 | completed = cur_ops->completed(); | |
e4aa0da3 | 1102 | ts = rcu_trace_clock_local(); |
632ee200 | 1103 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1104 | rcu_read_lock_bh_held() || |
1105 | rcu_read_lock_sched_held() || | |
1106 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
1107 | if (p == NULL) { |
1108 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1109 | cur_ops->readunlock(idx); |
a241ec65 PM |
1110 | schedule_timeout_interruptible(HZ); |
1111 | continue; | |
1112 | } | |
996417d2 PM |
1113 | if (p->rtort_mbtest == 0) |
1114 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1115 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1116 | preempt_disable(); |
1117 | pipe_count = p->rtort_pipe_count; | |
1118 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1119 | /* Should not happen, but... */ | |
1120 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1121 | } | |
52494535 PM |
1122 | completed_end = cur_ops->completed(); |
1123 | if (pipe_count > 1) { | |
52494535 PM |
1124 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
1125 | ts, completed, completed_end); | |
91afaf30 | 1126 | rcutorture_trace_dump(); |
52494535 | 1127 | } |
dd17c8f7 | 1128 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
52494535 | 1129 | completed = completed_end - completed; |
a241ec65 PM |
1130 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1131 | /* Should not happen, but... */ | |
1132 | completed = RCU_TORTURE_PIPE_LEN; | |
1133 | } | |
dd17c8f7 | 1134 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1135 | preempt_enable(); |
72e9bb54 | 1136 | cur_ops->readunlock(idx); |
a241ec65 | 1137 | schedule(); |
c9d557c1 PM |
1138 | rcu_stutter_wait("rcu_torture_reader"); |
1139 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 1140 | VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c1 | 1141 | rcutorture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 1142 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1143 | del_timer_sync(&t); |
c9d557c1 | 1144 | while (!kthread_should_stop()) |
a241ec65 PM |
1145 | schedule_timeout_uninterruptible(1); |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Create an RCU-torture statistics message in the specified buffer. | |
1151 | */ | |
1152 | static int | |
1153 | rcu_torture_printk(char *page) | |
1154 | { | |
1155 | int cnt = 0; | |
1156 | int cpu; | |
1157 | int i; | |
1158 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1159 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1160 | ||
0a945022 | 1161 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1162 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1163 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1164 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1165 | } | |
1166 | } | |
1167 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1168 | if (pipesummary[i] != 0) | |
1169 | break; | |
1170 | } | |
72e9bb54 | 1171 | cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1172 | cnt += sprintf(&page[cnt], |
5cf05ad7 | 1173 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", |
a241ec65 PM |
1174 | rcu_torture_current, |
1175 | rcu_torture_current_version, | |
1176 | list_empty(&rcu_torture_freelist), | |
1177 | atomic_read(&n_rcu_torture_alloc), | |
1178 | atomic_read(&n_rcu_torture_alloc_fail), | |
5cf05ad7 PM |
1179 | atomic_read(&n_rcu_torture_free)); |
1180 | cnt += sprintf(&page[cnt], "rtmbe: %d rtbke: %ld rtbre: %ld ", | |
0729fbf3 | 1181 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e | 1182 | n_rcu_torture_boost_ktrerror, |
5cf05ad7 PM |
1183 | n_rcu_torture_boost_rterror); |
1184 | cnt += sprintf(&page[cnt], "rtbf: %ld rtb: %ld nt: %ld ", | |
8e8be45e PM |
1185 | n_rcu_torture_boost_failure, |
1186 | n_rcu_torture_boosts, | |
5cf05ad7 | 1187 | n_rcu_torture_timers); |
13dbf914 PM |
1188 | cnt += sprintf(&page[cnt], |
1189 | "onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ", | |
1190 | n_online_successes, n_online_attempts, | |
1191 | n_offline_successes, n_offline_attempts, | |
1192 | min_online, max_online, | |
1193 | min_offline, max_offline, | |
1194 | sum_online, sum_offline, HZ); | |
5cf05ad7 | 1195 | cnt += sprintf(&page[cnt], "barrier: %ld/%ld:%ld", |
fae4b54f PM |
1196 | n_barrier_successes, |
1197 | n_barrier_attempts, | |
1198 | n_rcu_torture_barrier_error); | |
1199 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1200 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1201 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1202 | n_rcu_torture_boost_ktrerror != 0 || |
1203 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1204 | n_rcu_torture_boost_failure != 0 || |
1205 | i > 1) { | |
a241ec65 | 1206 | cnt += sprintf(&page[cnt], "!!! "); |
996417d2 | 1207 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1208 | WARN_ON_ONCE(1); |
996417d2 | 1209 | } |
a241ec65 PM |
1210 | cnt += sprintf(&page[cnt], "Reader Pipe: "); |
1211 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) | |
1212 | cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); | |
72e9bb54 | 1213 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1214 | cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb54 | 1215 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65 | 1216 | cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb54 | 1217 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 PM |
1218 | cnt += sprintf(&page[cnt], "Free-Block Circulation: "); |
1219 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { | |
1220 | cnt += sprintf(&page[cnt], " %d", | |
1221 | atomic_read(&rcu_torture_wcount[i])); | |
1222 | } | |
1223 | cnt += sprintf(&page[cnt], "\n"); | |
c8e5b163 | 1224 | if (cur_ops->stats) |
72e9bb54 | 1225 | cnt += cur_ops->stats(&page[cnt]); |
a241ec65 PM |
1226 | return cnt; |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Print torture statistics. Caller must ensure that there is only | |
1231 | * one call to this function at a given time!!! This is normally | |
1232 | * accomplished by relying on the module system to only have one copy | |
1233 | * of the module loaded, and then by giving the rcu_torture_stats | |
1234 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1235 | * thread is not running). | |
1236 | */ | |
1237 | static void | |
1238 | rcu_torture_stats_print(void) | |
1239 | { | |
1240 | int cnt; | |
1241 | ||
1242 | cnt = rcu_torture_printk(printk_buf); | |
2caa1e44 | 1243 | pr_alert("%s", printk_buf); |
a241ec65 PM |
1244 | } |
1245 | ||
1246 | /* | |
1247 | * Periodically prints torture statistics, if periodic statistics printing | |
1248 | * was specified via the stat_interval module parameter. | |
1249 | * | |
1250 | * No need to worry about fullstop here, since this one doesn't reference | |
1251 | * volatile state or register callbacks. | |
1252 | */ | |
1253 | static int | |
1254 | rcu_torture_stats(void *arg) | |
1255 | { | |
1256 | VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); | |
1257 | do { | |
1258 | schedule_timeout_interruptible(stat_interval * HZ); | |
1259 | rcu_torture_stats_print(); | |
c9d557c1 PM |
1260 | rcutorture_shutdown_absorb("rcu_torture_stats"); |
1261 | } while (!kthread_should_stop()); | |
a241ec65 PM |
1262 | VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); |
1263 | return 0; | |
1264 | } | |
1265 | ||
d84f5203 SV |
1266 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
1267 | ||
1268 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case | |
1269 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. | |
1270 | */ | |
b2896d2e | 1271 | static void rcu_torture_shuffle_tasks(void) |
d84f5203 | 1272 | { |
d84f5203 SV |
1273 | int i; |
1274 | ||
73d0a4b1 | 1275 | cpumask_setall(shuffle_tmp_mask); |
86ef5c9a | 1276 | get_online_cpus(); |
d84f5203 SV |
1277 | |
1278 | /* No point in shuffling if there is only one online CPU (ex: UP) */ | |
c9d557c1 PM |
1279 | if (num_online_cpus() == 1) { |
1280 | put_online_cpus(); | |
1281 | return; | |
1282 | } | |
d84f5203 SV |
1283 | |
1284 | if (rcu_idle_cpu != -1) | |
73d0a4b1 | 1285 | cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f5203 | 1286 | |
73d0a4b1 | 1287 | set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f5203 | 1288 | |
c8e5b163 | 1289 | if (reader_tasks) { |
d84f5203 SV |
1290 | for (i = 0; i < nrealreaders; i++) |
1291 | if (reader_tasks[i]) | |
f70316da | 1292 | set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b1 | 1293 | shuffle_tmp_mask); |
d84f5203 | 1294 | } |
c8e5b163 | 1295 | if (fakewriter_tasks) { |
b772e1dd JT |
1296 | for (i = 0; i < nfakewriters; i++) |
1297 | if (fakewriter_tasks[i]) | |
f70316da | 1298 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b1 | 1299 | shuffle_tmp_mask); |
b772e1dd | 1300 | } |
d84f5203 | 1301 | if (writer_task) |
73d0a4b1 | 1302 | set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f5203 | 1303 | if (stats_task) |
73d0a4b1 | 1304 | set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
0e11c8e8 PM |
1305 | if (stutter_task) |
1306 | set_cpus_allowed_ptr(stutter_task, shuffle_tmp_mask); | |
1307 | if (fqs_task) | |
1308 | set_cpus_allowed_ptr(fqs_task, shuffle_tmp_mask); | |
1309 | if (shutdown_task) | |
1310 | set_cpus_allowed_ptr(shutdown_task, shuffle_tmp_mask); | |
1311 | #ifdef CONFIG_HOTPLUG_CPU | |
1312 | if (onoff_task) | |
1313 | set_cpus_allowed_ptr(onoff_task, shuffle_tmp_mask); | |
1314 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1315 | if (stall_task) | |
1316 | set_cpus_allowed_ptr(stall_task, shuffle_tmp_mask); | |
1317 | if (barrier_cbs_tasks) | |
1318 | for (i = 0; i < n_barrier_cbs; i++) | |
1319 | if (barrier_cbs_tasks[i]) | |
1320 | set_cpus_allowed_ptr(barrier_cbs_tasks[i], | |
1321 | shuffle_tmp_mask); | |
1322 | if (barrier_task) | |
1323 | set_cpus_allowed_ptr(barrier_task, shuffle_tmp_mask); | |
d84f5203 SV |
1324 | |
1325 | if (rcu_idle_cpu == -1) | |
1326 | rcu_idle_cpu = num_online_cpus() - 1; | |
1327 | else | |
1328 | rcu_idle_cpu--; | |
1329 | ||
86ef5c9a | 1330 | put_online_cpus(); |
d84f5203 SV |
1331 | } |
1332 | ||
1333 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the | |
1334 | * system to become idle at a time and cut off its timer ticks. This is meant | |
1335 | * to test the support for such tickless idle CPU in RCU. | |
1336 | */ | |
1337 | static int | |
1338 | rcu_torture_shuffle(void *arg) | |
1339 | { | |
1340 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); | |
1341 | do { | |
1342 | schedule_timeout_interruptible(shuffle_interval * HZ); | |
1343 | rcu_torture_shuffle_tasks(); | |
c9d557c1 PM |
1344 | rcutorture_shutdown_absorb("rcu_torture_shuffle"); |
1345 | } while (!kthread_should_stop()); | |
d84f5203 SV |
1346 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); |
1347 | return 0; | |
1348 | } | |
1349 | ||
d120f65f PM |
1350 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1351 | * threads periodically. | |
1352 | */ | |
1353 | static int | |
1354 | rcu_torture_stutter(void *arg) | |
1355 | { | |
1356 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); | |
1357 | do { | |
1358 | schedule_timeout_interruptible(stutter * HZ); | |
1359 | stutter_pause_test = 1; | |
c9d557c1 | 1360 | if (!kthread_should_stop()) |
d120f65f PM |
1361 | schedule_timeout_interruptible(stutter * HZ); |
1362 | stutter_pause_test = 0; | |
c9d557c1 PM |
1363 | rcutorture_shutdown_absorb("rcu_torture_stutter"); |
1364 | } while (!kthread_should_stop()); | |
d120f65f PM |
1365 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); |
1366 | return 0; | |
1367 | } | |
1368 | ||
95c38322 | 1369 | static inline void |
e66c33d5 | 1370 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1371 | { |
2caa1e44 PM |
1372 | pr_alert("%s" TORTURE_FLAG |
1373 | "--- %s: nreaders=%d nfakewriters=%d " | |
1374 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1375 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1376 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1377 | "test_boost=%d/%d test_boost_interval=%d " | |
1378 | "test_boost_duration=%d shutdown_secs=%d " | |
67afeed2 PM |
1379 | "stall_cpu=%d stall_cpu_holdoff=%d " |
1380 | "n_barrier_cbs=%d " | |
2caa1e44 PM |
1381 | "onoff_interval=%d onoff_holdoff=%d\n", |
1382 | torture_type, tag, nrealreaders, nfakewriters, | |
1383 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1384 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1385 | test_boost, cur_ops->can_boost, | |
1386 | test_boost_interval, test_boost_duration, shutdown_secs, | |
67afeed2 PM |
1387 | stall_cpu, stall_cpu_holdoff, |
1388 | n_barrier_cbs, | |
2caa1e44 | 1389 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1390 | } |
1391 | ||
8e8be45e | 1392 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1393 | .notifier_call = rcutorture_shutdown_notify, |
1394 | }; | |
1395 | ||
8e8be45e PM |
1396 | static void rcutorture_booster_cleanup(int cpu) |
1397 | { | |
1398 | struct task_struct *t; | |
1399 | ||
1400 | if (boost_tasks[cpu] == NULL) | |
1401 | return; | |
1402 | mutex_lock(&boost_mutex); | |
1403 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); | |
1404 | t = boost_tasks[cpu]; | |
1405 | boost_tasks[cpu] = NULL; | |
1406 | mutex_unlock(&boost_mutex); | |
1407 | ||
1408 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1409 | kthread_stop(t); | |
37e377d2 | 1410 | boost_tasks[cpu] = NULL; |
8e8be45e PM |
1411 | } |
1412 | ||
1413 | static int rcutorture_booster_init(int cpu) | |
1414 | { | |
1415 | int retval; | |
1416 | ||
1417 | if (boost_tasks[cpu] != NULL) | |
1418 | return 0; /* Already created, nothing more to do. */ | |
1419 | ||
1420 | /* Don't allow time recalculation while creating a new task. */ | |
1421 | mutex_lock(&boost_mutex); | |
1422 | VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); | |
1f288094 ED |
1423 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1424 | cpu_to_node(cpu), | |
1425 | "rcu_torture_boost"); | |
8e8be45e PM |
1426 | if (IS_ERR(boost_tasks[cpu])) { |
1427 | retval = PTR_ERR(boost_tasks[cpu]); | |
1428 | VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); | |
1429 | n_rcu_torture_boost_ktrerror++; | |
1430 | boost_tasks[cpu] = NULL; | |
1431 | mutex_unlock(&boost_mutex); | |
1432 | return retval; | |
1433 | } | |
1434 | kthread_bind(boost_tasks[cpu], cpu); | |
1435 | wake_up_process(boost_tasks[cpu]); | |
1436 | mutex_unlock(&boost_mutex); | |
1437 | return 0; | |
1438 | } | |
1439 | ||
d5f546d8 PM |
1440 | /* |
1441 | * Cause the rcutorture test to shutdown the system after the test has | |
1442 | * run for the time specified by the shutdown_secs module parameter. | |
1443 | */ | |
1444 | static int | |
1445 | rcu_torture_shutdown(void *arg) | |
1446 | { | |
1447 | long delta; | |
1448 | unsigned long jiffies_snap; | |
1449 | ||
1450 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task started"); | |
1451 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1452 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1453 | !kthread_should_stop()) { | |
1454 | delta = shutdown_time - jiffies_snap; | |
1455 | if (verbose) | |
2caa1e44 PM |
1456 | pr_alert("%s" TORTURE_FLAG |
1457 | "rcu_torture_shutdown task: %lu jiffies remaining\n", | |
1458 | torture_type, delta); | |
d5f546d8 PM |
1459 | schedule_timeout_interruptible(delta); |
1460 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1461 | } | |
b58bdcca | 1462 | if (kthread_should_stop()) { |
d5f546d8 PM |
1463 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task stopping"); |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | /* OK, shut down the system. */ | |
1468 | ||
1469 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task shutting down system"); | |
1470 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ | |
1471 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1472 | kernel_power_off(); /* Shut down the system. */ | |
1473 | return 0; | |
1474 | } | |
1475 | ||
b58bdcca PM |
1476 | #ifdef CONFIG_HOTPLUG_CPU |
1477 | ||
1478 | /* | |
1479 | * Execute random CPU-hotplug operations at the interval specified | |
1480 | * by the onoff_interval. | |
1481 | */ | |
49fb4c62 | 1482 | static int |
b58bdcca PM |
1483 | rcu_torture_onoff(void *arg) |
1484 | { | |
1485 | int cpu; | |
13dbf914 | 1486 | unsigned long delta; |
b58bdcca PM |
1487 | int maxcpu = -1; |
1488 | DEFINE_RCU_RANDOM(rand); | |
48983260 | 1489 | int ret; |
13dbf914 | 1490 | unsigned long starttime; |
b58bdcca PM |
1491 | |
1492 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task started"); | |
1493 | for_each_online_cpu(cpu) | |
1494 | maxcpu = cpu; | |
1495 | WARN_ON(maxcpu < 0); | |
9b9ec9b9 PM |
1496 | if (onoff_holdoff > 0) { |
1497 | VERBOSE_PRINTK_STRING("rcu_torture_onoff begin holdoff"); | |
1498 | schedule_timeout_interruptible(onoff_holdoff * HZ); | |
1499 | VERBOSE_PRINTK_STRING("rcu_torture_onoff end holdoff"); | |
1500 | } | |
b58bdcca PM |
1501 | while (!kthread_should_stop()) { |
1502 | cpu = (rcu_random(&rand) >> 4) % (maxcpu + 1); | |
f220242a | 1503 | if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1504 | if (verbose) |
2caa1e44 PM |
1505 | pr_alert("%s" TORTURE_FLAG |
1506 | "rcu_torture_onoff task: offlining %d\n", | |
1507 | torture_type, cpu); | |
13dbf914 | 1508 | starttime = jiffies; |
b58bdcca | 1509 | n_offline_attempts++; |
48983260 PM |
1510 | ret = cpu_down(cpu); |
1511 | if (ret) { | |
1512 | if (verbose) | |
1513 | pr_alert("%s" TORTURE_FLAG | |
1514 | "rcu_torture_onoff task: offline %d failed: errno %d\n", | |
1515 | torture_type, cpu, ret); | |
1516 | } else { | |
b58bdcca | 1517 | if (verbose) |
2caa1e44 PM |
1518 | pr_alert("%s" TORTURE_FLAG |
1519 | "rcu_torture_onoff task: offlined %d\n", | |
1520 | torture_type, cpu); | |
b58bdcca | 1521 | n_offline_successes++; |
13dbf914 PM |
1522 | delta = jiffies - starttime; |
1523 | sum_offline += delta; | |
1524 | if (min_offline < 0) { | |
1525 | min_offline = delta; | |
1526 | max_offline = delta; | |
1527 | } | |
1528 | if (min_offline > delta) | |
1529 | min_offline = delta; | |
1530 | if (max_offline < delta) | |
1531 | max_offline = delta; | |
b58bdcca | 1532 | } |
f220242a | 1533 | } else if (cpu_is_hotpluggable(cpu)) { |
b58bdcca | 1534 | if (verbose) |
2caa1e44 PM |
1535 | pr_alert("%s" TORTURE_FLAG |
1536 | "rcu_torture_onoff task: onlining %d\n", | |
1537 | torture_type, cpu); | |
13dbf914 | 1538 | starttime = jiffies; |
b58bdcca PM |
1539 | n_online_attempts++; |
1540 | if (cpu_up(cpu) == 0) { | |
1541 | if (verbose) | |
2caa1e44 PM |
1542 | pr_alert("%s" TORTURE_FLAG |
1543 | "rcu_torture_onoff task: onlined %d\n", | |
1544 | torture_type, cpu); | |
b58bdcca | 1545 | n_online_successes++; |
13dbf914 PM |
1546 | delta = jiffies - starttime; |
1547 | sum_online += delta; | |
1548 | if (min_online < 0) { | |
1549 | min_online = delta; | |
1550 | max_online = delta; | |
1551 | } | |
1552 | if (min_online > delta) | |
1553 | min_online = delta; | |
1554 | if (max_online < delta) | |
1555 | max_online = delta; | |
b58bdcca PM |
1556 | } |
1557 | } | |
1558 | schedule_timeout_interruptible(onoff_interval * HZ); | |
1559 | } | |
1560 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task stopping"); | |
1561 | return 0; | |
1562 | } | |
1563 | ||
49fb4c62 | 1564 | static int |
b58bdcca PM |
1565 | rcu_torture_onoff_init(void) |
1566 | { | |
3c1b1ce0 JL |
1567 | int ret; |
1568 | ||
b58bdcca PM |
1569 | if (onoff_interval <= 0) |
1570 | return 0; | |
1571 | onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); | |
1572 | if (IS_ERR(onoff_task)) { | |
3c1b1ce0 | 1573 | ret = PTR_ERR(onoff_task); |
b58bdcca | 1574 | onoff_task = NULL; |
3c1b1ce0 | 1575 | return ret; |
b58bdcca PM |
1576 | } |
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | static void rcu_torture_onoff_cleanup(void) | |
1581 | { | |
1582 | if (onoff_task == NULL) | |
1583 | return; | |
1584 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_onoff task"); | |
1585 | kthread_stop(onoff_task); | |
37e377d2 | 1586 | onoff_task = NULL; |
b58bdcca PM |
1587 | } |
1588 | ||
1589 | #else /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1590 | ||
37e377d2 | 1591 | static int |
b58bdcca PM |
1592 | rcu_torture_onoff_init(void) |
1593 | { | |
37e377d2 | 1594 | return 0; |
b58bdcca PM |
1595 | } |
1596 | ||
1597 | static void rcu_torture_onoff_cleanup(void) | |
1598 | { | |
1599 | } | |
1600 | ||
1601 | #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ | |
1602 | ||
c13f3757 PM |
1603 | /* |
1604 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1605 | * induces a CPU stall for the time specified by stall_cpu. | |
1606 | */ | |
49fb4c62 | 1607 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1608 | { |
1609 | unsigned long stop_at; | |
1610 | ||
1611 | VERBOSE_PRINTK_STRING("rcu_torture_stall task started"); | |
1612 | if (stall_cpu_holdoff > 0) { | |
1613 | VERBOSE_PRINTK_STRING("rcu_torture_stall begin holdoff"); | |
1614 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); | |
1615 | VERBOSE_PRINTK_STRING("rcu_torture_stall end holdoff"); | |
1616 | } | |
1617 | if (!kthread_should_stop()) { | |
1618 | stop_at = get_seconds() + stall_cpu; | |
1619 | /* RCU CPU stall is expected behavior in following code. */ | |
2caa1e44 | 1620 | pr_alert("rcu_torture_stall start.\n"); |
c13f3757 PM |
1621 | rcu_read_lock(); |
1622 | preempt_disable(); | |
1623 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1624 | continue; /* Induce RCU CPU stall warning. */ | |
1625 | preempt_enable(); | |
1626 | rcu_read_unlock(); | |
2caa1e44 | 1627 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 PM |
1628 | } |
1629 | rcutorture_shutdown_absorb("rcu_torture_stall"); | |
1630 | while (!kthread_should_stop()) | |
1631 | schedule_timeout_interruptible(10 * HZ); | |
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1636 | static int __init rcu_torture_stall_init(void) | |
1637 | { | |
1638 | int ret; | |
1639 | ||
1640 | if (stall_cpu <= 0) | |
1641 | return 0; | |
1642 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1643 | if (IS_ERR(stall_task)) { | |
1644 | ret = PTR_ERR(stall_task); | |
1645 | stall_task = NULL; | |
1646 | return ret; | |
1647 | } | |
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1652 | static void rcu_torture_stall_cleanup(void) | |
1653 | { | |
1654 | if (stall_task == NULL) | |
1655 | return; | |
1656 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stall_task."); | |
1657 | kthread_stop(stall_task); | |
37e377d2 | 1658 | stall_task = NULL; |
c13f3757 PM |
1659 | } |
1660 | ||
fae4b54f PM |
1661 | /* Callback function for RCU barrier testing. */ |
1662 | void rcu_torture_barrier_cbf(struct rcu_head *rcu) | |
1663 | { | |
1664 | atomic_inc(&barrier_cbs_invoked); | |
1665 | } | |
1666 | ||
1667 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1668 | static int rcu_torture_barrier_cbs(void *arg) | |
1669 | { | |
1670 | long myid = (long)arg; | |
c6ebcbb6 | 1671 | bool lastphase = 0; |
fae4b54f PM |
1672 | struct rcu_head rcu; |
1673 | ||
1674 | init_rcu_head_on_stack(&rcu); | |
1675 | VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task started"); | |
1676 | set_user_nice(current, 19); | |
1677 | do { | |
1678 | wait_event(barrier_cbs_wq[myid], | |
c6ebcbb6 | 1679 | barrier_phase != lastphase || |
fae4b54f PM |
1680 | kthread_should_stop() || |
1681 | fullstop != FULLSTOP_DONTSTOP); | |
c6ebcbb6 PM |
1682 | lastphase = barrier_phase; |
1683 | smp_mb(); /* ensure barrier_phase load before ->call(). */ | |
fae4b54f PM |
1684 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) |
1685 | break; | |
1686 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1687 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1688 | wake_up(&barrier_wq); | |
1689 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
1690 | VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task stopping"); | |
1691 | rcutorture_shutdown_absorb("rcu_torture_barrier_cbs"); | |
1692 | while (!kthread_should_stop()) | |
1693 | schedule_timeout_interruptible(1); | |
1694 | cur_ops->cb_barrier(); | |
1695 | destroy_rcu_head_on_stack(&rcu); | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1700 | static int rcu_torture_barrier(void *arg) | |
1701 | { | |
1702 | int i; | |
1703 | ||
1704 | VERBOSE_PRINTK_STRING("rcu_torture_barrier task starting"); | |
1705 | do { | |
1706 | atomic_set(&barrier_cbs_invoked, 0); | |
1707 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
c6ebcbb6 PM |
1708 | smp_mb(); /* Ensure barrier_phase after prior assignments. */ |
1709 | barrier_phase = !barrier_phase; | |
fae4b54f PM |
1710 | for (i = 0; i < n_barrier_cbs; i++) |
1711 | wake_up(&barrier_cbs_wq[i]); | |
1712 | wait_event(barrier_wq, | |
1713 | atomic_read(&barrier_cbs_count) == 0 || | |
1714 | kthread_should_stop() || | |
1715 | fullstop != FULLSTOP_DONTSTOP); | |
1716 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1717 | break; | |
1718 | n_barrier_attempts++; | |
1719 | cur_ops->cb_barrier(); | |
1720 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { | |
1721 | n_rcu_torture_barrier_error++; | |
1722 | WARN_ON_ONCE(1); | |
1723 | } | |
1724 | n_barrier_successes++; | |
1725 | schedule_timeout_interruptible(HZ / 10); | |
1726 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
1727 | VERBOSE_PRINTK_STRING("rcu_torture_barrier task stopping"); | |
143aa672 | 1728 | rcutorture_shutdown_absorb("rcu_torture_barrier"); |
fae4b54f PM |
1729 | while (!kthread_should_stop()) |
1730 | schedule_timeout_interruptible(1); | |
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | /* Initialize RCU barrier testing. */ | |
1735 | static int rcu_torture_barrier_init(void) | |
1736 | { | |
1737 | int i; | |
1738 | int ret; | |
1739 | ||
1740 | if (n_barrier_cbs == 0) | |
1741 | return 0; | |
1742 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1743 | pr_alert("%s" TORTURE_FLAG |
1744 | " Call or barrier ops missing for %s,\n", | |
1745 | torture_type, cur_ops->name); | |
1746 | pr_alert("%s" TORTURE_FLAG | |
1747 | " RCU barrier testing omitted from run.\n", | |
1748 | torture_type); | |
fae4b54f PM |
1749 | return 0; |
1750 | } | |
1751 | atomic_set(&barrier_cbs_count, 0); | |
1752 | atomic_set(&barrier_cbs_invoked, 0); | |
1753 | barrier_cbs_tasks = | |
1754 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1755 | GFP_KERNEL); | |
1756 | barrier_cbs_wq = | |
1757 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1758 | GFP_KERNEL); | |
de5e6437 | 1759 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1760 | return -ENOMEM; |
1761 | for (i = 0; i < n_barrier_cbs; i++) { | |
1762 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
1763 | barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, | |
9059c940 | 1764 | (void *)(long)i, |
fae4b54f PM |
1765 | "rcu_torture_barrier_cbs"); |
1766 | if (IS_ERR(barrier_cbs_tasks[i])) { | |
1767 | ret = PTR_ERR(barrier_cbs_tasks[i]); | |
1768 | VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); | |
1769 | barrier_cbs_tasks[i] = NULL; | |
1770 | return ret; | |
1771 | } | |
1772 | } | |
1773 | barrier_task = kthread_run(rcu_torture_barrier, NULL, | |
1774 | "rcu_torture_barrier"); | |
1775 | if (IS_ERR(barrier_task)) { | |
1776 | ret = PTR_ERR(barrier_task); | |
1777 | VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier"); | |
1778 | barrier_task = NULL; | |
1779 | } | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | /* Clean up after RCU barrier testing. */ | |
1784 | static void rcu_torture_barrier_cleanup(void) | |
1785 | { | |
1786 | int i; | |
1787 | ||
1788 | if (barrier_task != NULL) { | |
1789 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier task"); | |
1790 | kthread_stop(barrier_task); | |
1791 | barrier_task = NULL; | |
1792 | } | |
1793 | if (barrier_cbs_tasks != NULL) { | |
1794 | for (i = 0; i < n_barrier_cbs; i++) { | |
1795 | if (barrier_cbs_tasks[i] != NULL) { | |
1796 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier_cbs task"); | |
1797 | kthread_stop(barrier_cbs_tasks[i]); | |
1798 | barrier_cbs_tasks[i] = NULL; | |
1799 | } | |
1800 | } | |
1801 | kfree(barrier_cbs_tasks); | |
1802 | barrier_cbs_tasks = NULL; | |
1803 | } | |
1804 | if (barrier_cbs_wq != NULL) { | |
1805 | kfree(barrier_cbs_wq); | |
1806 | barrier_cbs_wq = NULL; | |
1807 | } | |
1808 | } | |
1809 | ||
8e8be45e PM |
1810 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1811 | unsigned long action, void *hcpu) | |
1812 | { | |
1813 | long cpu = (long)hcpu; | |
1814 | ||
1815 | switch (action) { | |
1816 | case CPU_ONLINE: | |
1817 | case CPU_DOWN_FAILED: | |
1818 | (void)rcutorture_booster_init(cpu); | |
1819 | break; | |
1820 | case CPU_DOWN_PREPARE: | |
1821 | rcutorture_booster_cleanup(cpu); | |
1822 | break; | |
1823 | default: | |
1824 | break; | |
1825 | } | |
1826 | return NOTIFY_OK; | |
1827 | } | |
1828 | ||
1829 | static struct notifier_block rcutorture_cpu_nb = { | |
1830 | .notifier_call = rcutorture_cpu_notify, | |
1831 | }; | |
1832 | ||
a241ec65 PM |
1833 | static void |
1834 | rcu_torture_cleanup(void) | |
1835 | { | |
1836 | int i; | |
1837 | ||
343e9099 | 1838 | mutex_lock(&fullstop_mutex); |
4a298656 | 1839 | rcutorture_record_test_transition(); |
c9d557c1 | 1840 | if (fullstop == FULLSTOP_SHUTDOWN) { |
2caa1e44 | 1841 | pr_warn(/* but going down anyway, so... */ |
c9d557c1 | 1842 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); |
343e9099 | 1843 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1844 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1845 | if (cur_ops->cb_barrier != NULL) |
1846 | cur_ops->cb_barrier(); | |
1847 | return; | |
1848 | } | |
c9d557c1 | 1849 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1850 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1851 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
fae4b54f | 1852 | rcu_torture_barrier_cleanup(); |
c13f3757 | 1853 | rcu_torture_stall_cleanup(); |
d120f65f PM |
1854 | if (stutter_task) { |
1855 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); | |
1856 | kthread_stop(stutter_task); | |
1857 | } | |
1858 | stutter_task = NULL; | |
c8e5b163 | 1859 | if (shuffler_task) { |
d84f5203 SV |
1860 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); |
1861 | kthread_stop(shuffler_task); | |
73d0a4b1 | 1862 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
1863 | } |
1864 | shuffler_task = NULL; | |
1865 | ||
c8e5b163 | 1866 | if (writer_task) { |
a241ec65 PM |
1867 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); |
1868 | kthread_stop(writer_task); | |
1869 | } | |
1870 | writer_task = NULL; | |
1871 | ||
c8e5b163 | 1872 | if (reader_tasks) { |
a241ec65 | 1873 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1874 | if (reader_tasks[i]) { |
a241ec65 PM |
1875 | VERBOSE_PRINTK_STRING( |
1876 | "Stopping rcu_torture_reader task"); | |
1877 | kthread_stop(reader_tasks[i]); | |
1878 | } | |
1879 | reader_tasks[i] = NULL; | |
1880 | } | |
1881 | kfree(reader_tasks); | |
1882 | reader_tasks = NULL; | |
1883 | } | |
1884 | rcu_torture_current = NULL; | |
1885 | ||
c8e5b163 | 1886 | if (fakewriter_tasks) { |
b772e1dd | 1887 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1888 | if (fakewriter_tasks[i]) { |
b772e1dd JT |
1889 | VERBOSE_PRINTK_STRING( |
1890 | "Stopping rcu_torture_fakewriter task"); | |
1891 | kthread_stop(fakewriter_tasks[i]); | |
1892 | } | |
1893 | fakewriter_tasks[i] = NULL; | |
1894 | } | |
1895 | kfree(fakewriter_tasks); | |
1896 | fakewriter_tasks = NULL; | |
1897 | } | |
1898 | ||
c8e5b163 | 1899 | if (stats_task) { |
a241ec65 PM |
1900 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); |
1901 | kthread_stop(stats_task); | |
1902 | } | |
1903 | stats_task = NULL; | |
1904 | ||
bf66f18e PM |
1905 | if (fqs_task) { |
1906 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); | |
1907 | kthread_stop(fqs_task); | |
1908 | } | |
1909 | fqs_task = NULL; | |
8e8be45e PM |
1910 | if ((test_boost == 1 && cur_ops->can_boost) || |
1911 | test_boost == 2) { | |
1912 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1913 | for_each_possible_cpu(i) | |
1914 | rcutorture_booster_cleanup(i); | |
1915 | } | |
d5f546d8 PM |
1916 | if (shutdown_task != NULL) { |
1917 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shutdown task"); | |
1918 | kthread_stop(shutdown_task); | |
1919 | } | |
37e377d2 | 1920 | shutdown_task = NULL; |
b58bdcca | 1921 | rcu_torture_onoff_cleanup(); |
bf66f18e | 1922 | |
a241ec65 | 1923 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1924 | |
1925 | if (cur_ops->cb_barrier != NULL) | |
1926 | cur_ops->cb_barrier(); | |
a241ec65 | 1927 | |
a241ec65 | 1928 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1929 | |
fae4b54f | 1930 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1931 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bb PM |
1932 | else if (n_online_successes != n_online_attempts || |
1933 | n_offline_successes != n_offline_attempts) | |
1934 | rcu_torture_print_module_parms(cur_ops, | |
1935 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1936 | else |
8e8be45e | 1937 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1938 | } |
1939 | ||
d2818df1 PM |
1940 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
1941 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
1942 | { | |
1943 | } | |
1944 | ||
1945 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
1946 | { | |
1947 | /* | |
1948 | * This -might- happen due to race conditions, but is unlikely. | |
1949 | * The scenario that leads to this happening is that the | |
1950 | * first of the pair of duplicate callbacks is queued, | |
1951 | * someone else starts a grace period that includes that | |
1952 | * callback, then the second of the pair must wait for the | |
1953 | * next grace period. Unlikely, but can happen. If it | |
1954 | * does happen, the debug-objects subsystem won't have splatted. | |
1955 | */ | |
1956 | pr_alert("rcutorture: duplicated callback was invoked.\n"); | |
1957 | } | |
1958 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1959 | ||
1960 | /* | |
1961 | * Verify that double-free causes debug-objects to complain, but only | |
1962 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
1963 | * cannot be carried out. | |
1964 | */ | |
1965 | static void rcu_test_debug_objects(void) | |
1966 | { | |
1967 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
1968 | struct rcu_head rh1; | |
1969 | struct rcu_head rh2; | |
1970 | ||
1971 | init_rcu_head_on_stack(&rh1); | |
1972 | init_rcu_head_on_stack(&rh2); | |
1973 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test starting.\n"); | |
1974 | ||
1975 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
1976 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
1977 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
1978 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
1979 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
1980 | call_rcu(&rh2, rcu_torture_leak_cb); | |
1981 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
1982 | local_irq_enable(); | |
1983 | rcu_read_unlock(); | |
1984 | preempt_enable(); | |
1985 | ||
1986 | /* Wait for them all to get done so we can safely return. */ | |
1987 | rcu_barrier(); | |
1988 | pr_alert("rcutorture: WARN: Duplicate call_rcu() test complete.\n"); | |
1989 | destroy_rcu_head_on_stack(&rh1); | |
1990 | destroy_rcu_head_on_stack(&rh2); | |
1991 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1992 | pr_alert("rcutorture: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n"); | |
1993 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
1994 | } | |
1995 | ||
6f8bc500 | 1996 | static int __init |
a241ec65 PM |
1997 | rcu_torture_init(void) |
1998 | { | |
1999 | int i; | |
2000 | int cpu; | |
2001 | int firsterr = 0; | |
fae4b54f | 2002 | int retval; |
ade5fb81 | 2003 | static struct rcu_torture_ops *torture_ops[] = |
d9a3da06 | 2004 | { &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, |
bdf2a436 | 2005 | &rcu_bh_ops, &rcu_bh_sync_ops, &rcu_bh_expedited_ops, |
751a68b2 | 2006 | &srcu_ops, &srcu_sync_ops, &srcu_expedited_ops, |
804bb837 | 2007 | &sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
a241ec65 | 2008 | |
343e9099 PM |
2009 | mutex_lock(&fullstop_mutex); |
2010 | ||
a241ec65 | 2011 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 2012 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 2013 | cur_ops = torture_ops[i]; |
ade5fb81 | 2014 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 2015 | break; |
72e9bb54 | 2016 | } |
ade5fb81 | 2017 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
2018 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
2019 | torture_type); | |
2020 | pr_alert("rcu-torture types:"); | |
cf886c44 | 2021 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
2caa1e44 PM |
2022 | pr_alert(" %s", torture_ops[i]->name); |
2023 | pr_alert("\n"); | |
343e9099 | 2024 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 2025 | return -EINVAL; |
72e9bb54 | 2026 | } |
bf66f18e | 2027 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 2028 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
2029 | fqs_duration = 0; |
2030 | } | |
c8e5b163 | 2031 | if (cur_ops->init) |
72e9bb54 PM |
2032 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
2033 | ||
a241ec65 PM |
2034 | if (nreaders >= 0) |
2035 | nrealreaders = nreaders; | |
2036 | else | |
2037 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 2038 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 2039 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
2040 | |
2041 | /* Set up the freelist. */ | |
2042 | ||
2043 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 2044 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 2045 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
2046 | list_add_tail(&rcu_tortures[i].rtort_free, |
2047 | &rcu_torture_freelist); | |
2048 | } | |
2049 | ||
2050 | /* Initialize the statistics so that each run gets its own numbers. */ | |
2051 | ||
2052 | rcu_torture_current = NULL; | |
2053 | rcu_torture_current_version = 0; | |
2054 | atomic_set(&n_rcu_torture_alloc, 0); | |
2055 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
2056 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
2057 | atomic_set(&n_rcu_torture_mberror, 0); |
2058 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 2059 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
2060 | n_rcu_torture_boost_ktrerror = 0; |
2061 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
2062 | n_rcu_torture_boost_failure = 0; |
2063 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
2064 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
2065 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 2066 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
2067 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
2068 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
2069 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
2070 | } | |
2071 | } | |
2072 | ||
2073 | /* Start up the kthreads. */ | |
2074 | ||
2075 | VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); | |
60f53782 PM |
2076 | writer_task = kthread_create(rcu_torture_writer, NULL, |
2077 | "rcu_torture_writer"); | |
a241ec65 PM |
2078 | if (IS_ERR(writer_task)) { |
2079 | firsterr = PTR_ERR(writer_task); | |
2080 | VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); | |
2081 | writer_task = NULL; | |
2082 | goto unwind; | |
2083 | } | |
60f53782 | 2084 | wake_up_process(writer_task); |
b772e1dd | 2085 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 2086 | GFP_KERNEL); |
b772e1dd JT |
2087 | if (fakewriter_tasks == NULL) { |
2088 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
2089 | firsterr = -ENOMEM; | |
2090 | goto unwind; | |
2091 | } | |
2092 | for (i = 0; i < nfakewriters; i++) { | |
2093 | VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); | |
2094 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, | |
a71fca58 | 2095 | "rcu_torture_fakewriter"); |
b772e1dd JT |
2096 | if (IS_ERR(fakewriter_tasks[i])) { |
2097 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
2098 | VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); | |
2099 | fakewriter_tasks[i] = NULL; | |
2100 | goto unwind; | |
2101 | } | |
2102 | } | |
2860aaba | 2103 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
2104 | GFP_KERNEL); |
2105 | if (reader_tasks == NULL) { | |
2106 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
2107 | firsterr = -ENOMEM; | |
2108 | goto unwind; | |
2109 | } | |
2110 | for (i = 0; i < nrealreaders; i++) { | |
2111 | VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); | |
2112 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, | |
2113 | "rcu_torture_reader"); | |
2114 | if (IS_ERR(reader_tasks[i])) { | |
2115 | firsterr = PTR_ERR(reader_tasks[i]); | |
2116 | VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); | |
2117 | reader_tasks[i] = NULL; | |
2118 | goto unwind; | |
2119 | } | |
2120 | } | |
2121 | if (stat_interval > 0) { | |
2122 | VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); | |
2123 | stats_task = kthread_run(rcu_torture_stats, NULL, | |
2124 | "rcu_torture_stats"); | |
2125 | if (IS_ERR(stats_task)) { | |
2126 | firsterr = PTR_ERR(stats_task); | |
2127 | VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); | |
2128 | stats_task = NULL; | |
2129 | goto unwind; | |
2130 | } | |
2131 | } | |
d84f5203 SV |
2132 | if (test_no_idle_hz) { |
2133 | rcu_idle_cpu = num_online_cpus() - 1; | |
73d0a4b1 RR |
2134 | |
2135 | if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { | |
2136 | firsterr = -ENOMEM; | |
2137 | VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); | |
2138 | goto unwind; | |
2139 | } | |
2140 | ||
d84f5203 SV |
2141 | /* Create the shuffler thread */ |
2142 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, | |
2143 | "rcu_torture_shuffle"); | |
2144 | if (IS_ERR(shuffler_task)) { | |
73d0a4b1 | 2145 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
2146 | firsterr = PTR_ERR(shuffler_task); |
2147 | VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); | |
2148 | shuffler_task = NULL; | |
2149 | goto unwind; | |
2150 | } | |
2151 | } | |
d120f65f PM |
2152 | if (stutter < 0) |
2153 | stutter = 0; | |
2154 | if (stutter) { | |
2155 | /* Create the stutter thread */ | |
2156 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
2157 | "rcu_torture_stutter"); | |
2158 | if (IS_ERR(stutter_task)) { | |
2159 | firsterr = PTR_ERR(stutter_task); | |
2160 | VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); | |
2161 | stutter_task = NULL; | |
2162 | goto unwind; | |
2163 | } | |
2164 | } | |
bf66f18e PM |
2165 | if (fqs_duration < 0) |
2166 | fqs_duration = 0; | |
2167 | if (fqs_duration) { | |
2168 | /* Create the stutter thread */ | |
2169 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
2170 | "rcu_torture_fqs"); | |
2171 | if (IS_ERR(fqs_task)) { | |
2172 | firsterr = PTR_ERR(fqs_task); | |
2173 | VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); | |
2174 | fqs_task = NULL; | |
2175 | goto unwind; | |
2176 | } | |
2177 | } | |
8e8be45e PM |
2178 | if (test_boost_interval < 1) |
2179 | test_boost_interval = 1; | |
2180 | if (test_boost_duration < 2) | |
2181 | test_boost_duration = 2; | |
2182 | if ((test_boost == 1 && cur_ops->can_boost) || | |
2183 | test_boost == 2) { | |
8e8be45e PM |
2184 | |
2185 | boost_starttime = jiffies + test_boost_interval * HZ; | |
2186 | register_cpu_notifier(&rcutorture_cpu_nb); | |
2187 | for_each_possible_cpu(i) { | |
2188 | if (cpu_is_offline(i)) | |
2189 | continue; /* Heuristic: CPU can go offline. */ | |
2190 | retval = rcutorture_booster_init(i); | |
2191 | if (retval < 0) { | |
2192 | firsterr = retval; | |
2193 | goto unwind; | |
2194 | } | |
2195 | } | |
2196 | } | |
d5f546d8 PM |
2197 | if (shutdown_secs > 0) { |
2198 | shutdown_time = jiffies + shutdown_secs * HZ; | |
60f53782 PM |
2199 | shutdown_task = kthread_create(rcu_torture_shutdown, NULL, |
2200 | "rcu_torture_shutdown"); | |
d5f546d8 PM |
2201 | if (IS_ERR(shutdown_task)) { |
2202 | firsterr = PTR_ERR(shutdown_task); | |
2203 | VERBOSE_PRINTK_ERRSTRING("Failed to create shutdown"); | |
2204 | shutdown_task = NULL; | |
2205 | goto unwind; | |
2206 | } | |
60f53782 | 2207 | wake_up_process(shutdown_task); |
d5f546d8 | 2208 | } |
37e377d2 PM |
2209 | i = rcu_torture_onoff_init(); |
2210 | if (i != 0) { | |
2211 | firsterr = i; | |
2212 | goto unwind; | |
2213 | } | |
8e8be45e | 2214 | register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d2 PM |
2215 | i = rcu_torture_stall_init(); |
2216 | if (i != 0) { | |
2217 | firsterr = i; | |
2218 | goto unwind; | |
2219 | } | |
fae4b54f PM |
2220 | retval = rcu_torture_barrier_init(); |
2221 | if (retval != 0) { | |
2222 | firsterr = retval; | |
2223 | goto unwind; | |
2224 | } | |
d2818df1 PM |
2225 | if (object_debug) |
2226 | rcu_test_debug_objects(); | |
4a298656 | 2227 | rcutorture_record_test_transition(); |
343e9099 | 2228 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2229 | return 0; |
2230 | ||
2231 | unwind: | |
343e9099 | 2232 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2233 | rcu_torture_cleanup(); |
2234 | return firsterr; | |
2235 | } | |
2236 | ||
2237 | module_init(rcu_torture_init); | |
2238 | module_exit(rcu_torture_cleanup); |