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> |
f07767fd | 49 | #include <asm/byteorder.h> |
a241ec65 PM |
50 | |
51 | MODULE_LICENSE("GPL"); | |
b772e1dd | 52 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and " |
a71fca58 | 53 | "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 */ |
d84f5203 | 57 | static int stat_interval; /* Interval between stats, in seconds. */ |
a241ec65 | 58 | /* Defaults to "only at end of test". */ |
d8e8ed95 RR |
59 | static bool verbose; /* Print more debug info. */ |
60 | static bool test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ | |
d120f65f PM |
61 | static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ |
62 | static int stutter = 5; /* Start/stop testing interval (in sec) */ | |
0729fbf3 | 63 | static int irqreader = 1; /* RCU readers from irq (timers). */ |
d5f546d8 PM |
64 | static int fqs_duration; /* Duration of bursts (us), 0 to disable. */ |
65 | static int fqs_holdoff; /* Hold time within burst (us). */ | |
bf66f18e | 66 | static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
fae4b54f | 67 | static int n_barrier_cbs; /* Number of callbacks to test RCU barriers. */ |
b58bdcca | 68 | static int onoff_interval; /* Wait time between CPU hotplugs, 0=disable. */ |
9b9ec9b9 | 69 | static int onoff_holdoff; /* Seconds after boot before CPU hotplugs. */ |
d5f546d8 | 70 | static int shutdown_secs; /* Shutdown time (s). <=0 for no shutdown. */ |
c13f3757 PM |
71 | static int stall_cpu; /* CPU-stall duration (s). 0 for no stall. */ |
72 | static int stall_cpu_holdoff = 10; /* Time to wait until stall (s). */ | |
8e8be45e PM |
73 | static int test_boost = 1; /* Test RCU prio boost: 0=no, 1=maybe, 2=yes. */ |
74 | static int test_boost_interval = 7; /* Interval between boost tests, seconds. */ | |
75 | static int test_boost_duration = 4; /* Duration of each boost test, seconds. */ | |
20d2e428 | 76 | static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
a241ec65 | 77 | |
d6ad6711 | 78 | module_param(nreaders, int, 0444); |
a241ec65 | 79 | MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
d6ad6711 | 80 | module_param(nfakewriters, int, 0444); |
b772e1dd | 81 | MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
3721bc1d | 82 | module_param(stat_interval, int, 0644); |
a241ec65 | 83 | MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
d6ad6711 | 84 | module_param(verbose, bool, 0444); |
a241ec65 | 85 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
d6ad6711 | 86 | module_param(test_no_idle_hz, bool, 0444); |
d84f5203 | 87 | MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
d6ad6711 | 88 | module_param(shuffle_interval, int, 0444); |
d84f5203 | 89 | MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
d120f65f PM |
90 | module_param(stutter, int, 0444); |
91 | MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); | |
0729fbf3 PM |
92 | module_param(irqreader, int, 0444); |
93 | MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); | |
bf66f18e PM |
94 | module_param(fqs_duration, int, 0444); |
95 | MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us)"); | |
96 | module_param(fqs_holdoff, int, 0444); | |
97 | MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); | |
98 | module_param(fqs_stutter, int, 0444); | |
99 | MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); | |
fae4b54f PM |
100 | module_param(n_barrier_cbs, int, 0444); |
101 | MODULE_PARM_DESC(n_barrier_cbs, "# of callbacks/kthreads for barrier testing"); | |
b58bdcca PM |
102 | module_param(onoff_interval, int, 0444); |
103 | MODULE_PARM_DESC(onoff_interval, "Time between CPU hotplugs (s), 0=disable"); | |
9b9ec9b9 PM |
104 | module_param(onoff_holdoff, int, 0444); |
105 | MODULE_PARM_DESC(onoff_holdoff, "Time after boot before CPU hotplugs (s)"); | |
d5f546d8 PM |
106 | module_param(shutdown_secs, int, 0444); |
107 | MODULE_PARM_DESC(shutdown_secs, "Shutdown time (s), zero to disable."); | |
c13f3757 PM |
108 | module_param(stall_cpu, int, 0444); |
109 | MODULE_PARM_DESC(stall_cpu, "Stall duration (s), zero to disable."); | |
110 | module_param(stall_cpu_holdoff, int, 0444); | |
111 | MODULE_PARM_DESC(stall_cpu_holdoff, "Time to wait before starting stall (s)."); | |
8e8be45e PM |
112 | module_param(test_boost, int, 0444); |
113 | MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
114 | module_param(test_boost_interval, int, 0444); | |
115 | MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); | |
116 | module_param(test_boost_duration, int, 0444); | |
117 | MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); | |
d6ad6711 | 118 | module_param(torture_type, charp, 0444); |
b2896d2e | 119 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
72e9bb54 PM |
120 | |
121 | #define TORTURE_FLAG "-torture:" | |
a241ec65 | 122 | #define PRINTK_STRING(s) \ |
72e9bb54 | 123 | do { printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 124 | #define VERBOSE_PRINTK_STRING(s) \ |
72e9bb54 | 125 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 126 | #define VERBOSE_PRINTK_ERRSTRING(s) \ |
72e9bb54 | 127 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) |
a241ec65 PM |
128 | |
129 | static char printk_buf[4096]; | |
130 | ||
131 | static int nrealreaders; | |
132 | static struct task_struct *writer_task; | |
b772e1dd | 133 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
134 | static struct task_struct **reader_tasks; |
135 | static struct task_struct *stats_task; | |
d84f5203 | 136 | static struct task_struct *shuffler_task; |
d120f65f | 137 | static struct task_struct *stutter_task; |
bf66f18e | 138 | static struct task_struct *fqs_task; |
8e8be45e | 139 | static struct task_struct *boost_tasks[NR_CPUS]; |
d5f546d8 | 140 | static struct task_struct *shutdown_task; |
b58bdcca PM |
141 | #ifdef CONFIG_HOTPLUG_CPU |
142 | static struct task_struct *onoff_task; | |
143 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
c13f3757 | 144 | static struct task_struct *stall_task; |
fae4b54f PM |
145 | static struct task_struct **barrier_cbs_tasks; |
146 | static struct task_struct *barrier_task; | |
a241ec65 PM |
147 | |
148 | #define RCU_TORTURE_PIPE_LEN 10 | |
149 | ||
150 | struct rcu_torture { | |
151 | struct rcu_head rtort_rcu; | |
152 | int rtort_pipe_count; | |
153 | struct list_head rtort_free; | |
996417d2 | 154 | int rtort_mbtest; |
a241ec65 PM |
155 | }; |
156 | ||
a241ec65 | 157 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 158 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 159 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
160 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
161 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
162 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = | |
163 | { 0 }; | |
164 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = | |
165 | { 0 }; | |
166 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; | |
b2896d2e PM |
167 | static atomic_t n_rcu_torture_alloc; |
168 | static atomic_t n_rcu_torture_alloc_fail; | |
169 | static atomic_t n_rcu_torture_free; | |
170 | static atomic_t n_rcu_torture_mberror; | |
171 | static atomic_t n_rcu_torture_error; | |
fae4b54f | 172 | static long n_rcu_torture_barrier_error; |
8e8be45e PM |
173 | static long n_rcu_torture_boost_ktrerror; |
174 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
175 | static long n_rcu_torture_boost_failure; |
176 | static long n_rcu_torture_boosts; | |
a71fca58 | 177 | static long n_rcu_torture_timers; |
b58bdcca PM |
178 | static long n_offline_attempts; |
179 | static long n_offline_successes; | |
180 | static long n_online_attempts; | |
181 | static long n_online_successes; | |
fae4b54f PM |
182 | static long n_barrier_attempts; |
183 | static long n_barrier_successes; | |
e3033736 | 184 | static struct list_head rcu_torture_removed; |
73d0a4b1 | 185 | static cpumask_var_t shuffle_tmp_mask; |
a241ec65 | 186 | |
a71fca58 | 187 | static int stutter_pause_test; |
d120f65f | 188 | |
31a72bce PM |
189 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
190 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
191 | #else | |
192 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
193 | #endif | |
194 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
195 | module_param(rcutorture_runnable, int, 0444); |
196 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 197 | |
3acf4a9a | 198 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 199 | #define rcu_can_boost() 1 |
3acf4a9a | 200 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 201 | #define rcu_can_boost() 0 |
3acf4a9a | 202 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 203 | |
d5f546d8 | 204 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
205 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
206 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
207 | /* and boost task create/destroy. */ | |
fae4b54f PM |
208 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
209 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ | |
210 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
211 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 212 | |
c9d557c1 PM |
213 | /* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ |
214 | ||
215 | #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ | |
216 | #define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ | |
217 | #define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ | |
218 | static int fullstop = FULLSTOP_RMMOD; | |
0ddea0ea PM |
219 | /* |
220 | * Protect fullstop transitions and spawning of kthreads. | |
221 | */ | |
222 | static DEFINE_MUTEX(fullstop_mutex); | |
343e9099 | 223 | |
d5f546d8 PM |
224 | /* Forward reference. */ |
225 | static void rcu_torture_cleanup(void); | |
226 | ||
343e9099 | 227 | /* |
c9d557c1 | 228 | * Detect and respond to a system shutdown. |
343e9099 PM |
229 | */ |
230 | static int | |
231 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
232 | unsigned long unused2, void *unused3) | |
233 | { | |
c59ab97e | 234 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 235 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 236 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 PM |
237 | else |
238 | printk(KERN_WARNING /* but going down anyway, so... */ | |
239 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); | |
c59ab97e | 240 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
241 | return NOTIFY_DONE; |
242 | } | |
243 | ||
c9d557c1 PM |
244 | /* |
245 | * Absorb kthreads into a kernel function that won't return, so that | |
246 | * they won't ever access module text or data again. | |
247 | */ | |
248 | static void rcutorture_shutdown_absorb(char *title) | |
249 | { | |
250 | if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { | |
251 | printk(KERN_NOTICE | |
252 | "rcutorture thread %s parking due to system shutdown\n", | |
253 | title); | |
254 | schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); | |
255 | } | |
256 | } | |
257 | ||
a241ec65 PM |
258 | /* |
259 | * Allocate an element from the rcu_tortures pool. | |
260 | */ | |
97a41e26 | 261 | static struct rcu_torture * |
a241ec65 PM |
262 | rcu_torture_alloc(void) |
263 | { | |
264 | struct list_head *p; | |
265 | ||
adac1665 | 266 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
267 | if (list_empty(&rcu_torture_freelist)) { |
268 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 269 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
270 | return NULL; |
271 | } | |
272 | atomic_inc(&n_rcu_torture_alloc); | |
273 | p = rcu_torture_freelist.next; | |
274 | list_del_init(p); | |
adac1665 | 275 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
276 | return container_of(p, struct rcu_torture, rtort_free); |
277 | } | |
278 | ||
279 | /* | |
280 | * Free an element to the rcu_tortures pool. | |
281 | */ | |
282 | static void | |
283 | rcu_torture_free(struct rcu_torture *p) | |
284 | { | |
285 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 286 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 287 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 288 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
289 | } |
290 | ||
a241ec65 PM |
291 | struct rcu_random_state { |
292 | unsigned long rrs_state; | |
75cfef32 | 293 | long rrs_count; |
a241ec65 PM |
294 | }; |
295 | ||
296 | #define RCU_RANDOM_MULT 39916801 /* prime */ | |
297 | #define RCU_RANDOM_ADD 479001701 /* prime */ | |
298 | #define RCU_RANDOM_REFRESH 10000 | |
299 | ||
300 | #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } | |
301 | ||
302 | /* | |
303 | * Crude but fast random-number generator. Uses a linear congruential | |
c17ac855 | 304 | * generator, with occasional help from cpu_clock(). |
a241ec65 | 305 | */ |
75cfef32 | 306 | static unsigned long |
a241ec65 PM |
307 | rcu_random(struct rcu_random_state *rrsp) |
308 | { | |
a241ec65 | 309 | if (--rrsp->rrs_count < 0) { |
c676329a | 310 | rrsp->rrs_state += (unsigned long)local_clock(); |
a241ec65 PM |
311 | rrsp->rrs_count = RCU_RANDOM_REFRESH; |
312 | } | |
313 | rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; | |
314 | return swahw32(rrsp->rrs_state); | |
315 | } | |
316 | ||
d120f65f | 317 | static void |
c9d557c1 | 318 | rcu_stutter_wait(char *title) |
d120f65f | 319 | { |
c9d557c1 | 320 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
321 | if (rcutorture_runnable) |
322 | schedule_timeout_interruptible(1); | |
323 | else | |
3ccf79f4 | 324 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
c9d557c1 | 325 | rcutorture_shutdown_absorb(title); |
343e9099 | 326 | } |
d120f65f PM |
327 | } |
328 | ||
72e9bb54 PM |
329 | /* |
330 | * Operations vector for selecting different types of tests. | |
331 | */ | |
332 | ||
333 | struct rcu_torture_ops { | |
334 | void (*init)(void); | |
335 | void (*cleanup)(void); | |
336 | int (*readlock)(void); | |
0acc512c | 337 | void (*read_delay)(struct rcu_random_state *rrsp); |
72e9bb54 PM |
338 | void (*readunlock)(int idx); |
339 | int (*completed)(void); | |
0acc512c | 340 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 341 | void (*sync)(void); |
fae4b54f | 342 | void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
2326974d | 343 | void (*cb_barrier)(void); |
bf66f18e | 344 | void (*fqs)(void); |
72e9bb54 | 345 | int (*stats)(char *page); |
0acc512c | 346 | int irq_capable; |
8e8be45e | 347 | int can_boost; |
72e9bb54 PM |
348 | char *name; |
349 | }; | |
a71fca58 PM |
350 | |
351 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
352 | |
353 | /* | |
354 | * Definitions for rcu torture testing. | |
355 | */ | |
356 | ||
a49a4af7 | 357 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
358 | { |
359 | rcu_read_lock(); | |
360 | return 0; | |
361 | } | |
362 | ||
b2896d2e PM |
363 | static void rcu_read_delay(struct rcu_random_state *rrsp) |
364 | { | |
b8d57a76 JT |
365 | const unsigned long shortdelay_us = 200; |
366 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 367 | |
b8d57a76 JT |
368 | /* We want a short delay sometimes to make a reader delay the grace |
369 | * period, and we want a long delay occasionally to trigger | |
370 | * force_quiescent_state. */ | |
b2896d2e | 371 | |
b8d57a76 JT |
372 | if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
373 | mdelay(longdelay_ms); | |
374 | if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) | |
375 | udelay(shortdelay_us); | |
e546f485 LJ |
376 | #ifdef CONFIG_PREEMPT |
377 | if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) | |
378 | preempt_schedule(); /* No QS if preempt_disable() in effect */ | |
379 | #endif | |
b2896d2e PM |
380 | } |
381 | ||
a49a4af7 | 382 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
383 | { |
384 | rcu_read_unlock(); | |
385 | } | |
386 | ||
387 | static int rcu_torture_completed(void) | |
388 | { | |
389 | return rcu_batches_completed(); | |
390 | } | |
391 | ||
392 | static void | |
393 | rcu_torture_cb(struct rcu_head *p) | |
394 | { | |
395 | int i; | |
396 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
397 | ||
c9d557c1 | 398 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
399 | /* Test is ending, just drop callbacks on the floor. */ |
400 | /* The next initialization will pick up the pieces. */ | |
401 | return; | |
402 | } | |
403 | i = rp->rtort_pipe_count; | |
404 | if (i > RCU_TORTURE_PIPE_LEN) | |
405 | i = RCU_TORTURE_PIPE_LEN; | |
406 | atomic_inc(&rcu_torture_wcount[i]); | |
407 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
408 | rp->rtort_mbtest = 0; | |
409 | rcu_torture_free(rp); | |
410 | } else | |
0acc512c | 411 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
412 | } |
413 | ||
d9a3da06 PM |
414 | static int rcu_no_completed(void) |
415 | { | |
416 | return 0; | |
417 | } | |
418 | ||
72e9bb54 PM |
419 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
420 | { | |
421 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
422 | } | |
423 | ||
424 | static struct rcu_torture_ops rcu_ops = { | |
0acc512c PM |
425 | .init = NULL, |
426 | .cleanup = NULL, | |
427 | .readlock = rcu_torture_read_lock, | |
428 | .read_delay = rcu_read_delay, | |
429 | .readunlock = rcu_torture_read_unlock, | |
430 | .completed = rcu_torture_completed, | |
431 | .deferred_free = rcu_torture_deferred_free, | |
432 | .sync = synchronize_rcu, | |
fae4b54f | 433 | .call = call_rcu, |
0acc512c | 434 | .cb_barrier = rcu_barrier, |
bf66f18e | 435 | .fqs = rcu_force_quiescent_state, |
0acc512c | 436 | .stats = NULL, |
a71fca58 | 437 | .irq_capable = 1, |
8e8be45e | 438 | .can_boost = rcu_can_boost(), |
a71fca58 | 439 | .name = "rcu" |
72e9bb54 PM |
440 | }; |
441 | ||
e3033736 JT |
442 | static void rcu_sync_torture_deferred_free(struct rcu_torture *p) |
443 | { | |
444 | int i; | |
445 | struct rcu_torture *rp; | |
446 | struct rcu_torture *rp1; | |
447 | ||
448 | cur_ops->sync(); | |
449 | list_add(&p->rtort_free, &rcu_torture_removed); | |
450 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
451 | i = rp->rtort_pipe_count; | |
452 | if (i > RCU_TORTURE_PIPE_LEN) | |
453 | i = RCU_TORTURE_PIPE_LEN; | |
454 | atomic_inc(&rcu_torture_wcount[i]); | |
455 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
456 | rp->rtort_mbtest = 0; | |
457 | list_del(&rp->rtort_free); | |
458 | rcu_torture_free(rp); | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | static void rcu_sync_torture_init(void) | |
464 | { | |
465 | INIT_LIST_HEAD(&rcu_torture_removed); | |
466 | } | |
467 | ||
20d2e428 | 468 | static struct rcu_torture_ops rcu_sync_ops = { |
0acc512c PM |
469 | .init = rcu_sync_torture_init, |
470 | .cleanup = NULL, | |
471 | .readlock = rcu_torture_read_lock, | |
472 | .read_delay = rcu_read_delay, | |
473 | .readunlock = rcu_torture_read_unlock, | |
474 | .completed = rcu_torture_completed, | |
475 | .deferred_free = rcu_sync_torture_deferred_free, | |
476 | .sync = synchronize_rcu, | |
fae4b54f | 477 | .call = NULL, |
0acc512c | 478 | .cb_barrier = NULL, |
bf66f18e | 479 | .fqs = rcu_force_quiescent_state, |
0acc512c PM |
480 | .stats = NULL, |
481 | .irq_capable = 1, | |
8e8be45e | 482 | .can_boost = rcu_can_boost(), |
0acc512c | 483 | .name = "rcu_sync" |
20d2e428 JT |
484 | }; |
485 | ||
d9a3da06 PM |
486 | static struct rcu_torture_ops rcu_expedited_ops = { |
487 | .init = rcu_sync_torture_init, | |
488 | .cleanup = NULL, | |
489 | .readlock = rcu_torture_read_lock, | |
490 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
491 | .readunlock = rcu_torture_read_unlock, | |
492 | .completed = rcu_no_completed, | |
493 | .deferred_free = rcu_sync_torture_deferred_free, | |
494 | .sync = synchronize_rcu_expedited, | |
fae4b54f | 495 | .call = NULL, |
d9a3da06 | 496 | .cb_barrier = NULL, |
bf66f18e | 497 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
498 | .stats = NULL, |
499 | .irq_capable = 1, | |
8e8be45e | 500 | .can_boost = rcu_can_boost(), |
d9a3da06 PM |
501 | .name = "rcu_expedited" |
502 | }; | |
503 | ||
c32e0660 PM |
504 | /* |
505 | * Definitions for rcu_bh torture testing. | |
506 | */ | |
507 | ||
a49a4af7 | 508 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
509 | { |
510 | rcu_read_lock_bh(); | |
511 | return 0; | |
512 | } | |
513 | ||
a49a4af7 | 514 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
515 | { |
516 | rcu_read_unlock_bh(); | |
517 | } | |
518 | ||
519 | static int rcu_bh_torture_completed(void) | |
520 | { | |
521 | return rcu_batches_completed_bh(); | |
522 | } | |
523 | ||
524 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
525 | { | |
526 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
527 | } | |
528 | ||
529 | static struct rcu_torture_ops rcu_bh_ops = { | |
0acc512c PM |
530 | .init = NULL, |
531 | .cleanup = NULL, | |
532 | .readlock = rcu_bh_torture_read_lock, | |
533 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
534 | .readunlock = rcu_bh_torture_read_unlock, | |
535 | .completed = rcu_bh_torture_completed, | |
536 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 537 | .sync = synchronize_rcu_bh, |
fae4b54f | 538 | .call = call_rcu_bh, |
0acc512c | 539 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 540 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
541 | .stats = NULL, |
542 | .irq_capable = 1, | |
543 | .name = "rcu_bh" | |
c32e0660 PM |
544 | }; |
545 | ||
11a14701 | 546 | static struct rcu_torture_ops rcu_bh_sync_ops = { |
0acc512c PM |
547 | .init = rcu_sync_torture_init, |
548 | .cleanup = NULL, | |
549 | .readlock = rcu_bh_torture_read_lock, | |
550 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
551 | .readunlock = rcu_bh_torture_read_unlock, | |
552 | .completed = rcu_bh_torture_completed, | |
553 | .deferred_free = rcu_sync_torture_deferred_free, | |
bdf2a436 | 554 | .sync = synchronize_rcu_bh, |
fae4b54f | 555 | .call = NULL, |
0acc512c | 556 | .cb_barrier = NULL, |
bf66f18e | 557 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
558 | .stats = NULL, |
559 | .irq_capable = 1, | |
560 | .name = "rcu_bh_sync" | |
11a14701 JT |
561 | }; |
562 | ||
bdf2a436 PM |
563 | static struct rcu_torture_ops rcu_bh_expedited_ops = { |
564 | .init = rcu_sync_torture_init, | |
565 | .cleanup = NULL, | |
566 | .readlock = rcu_bh_torture_read_lock, | |
567 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
568 | .readunlock = rcu_bh_torture_read_unlock, | |
569 | .completed = rcu_bh_torture_completed, | |
570 | .deferred_free = rcu_sync_torture_deferred_free, | |
571 | .sync = synchronize_rcu_bh_expedited, | |
fae4b54f | 572 | .call = NULL, |
bdf2a436 PM |
573 | .cb_barrier = NULL, |
574 | .fqs = rcu_bh_force_quiescent_state, | |
575 | .stats = NULL, | |
576 | .irq_capable = 1, | |
577 | .name = "rcu_bh_expedited" | |
578 | }; | |
579 | ||
b2896d2e PM |
580 | /* |
581 | * Definitions for srcu torture testing. | |
582 | */ | |
583 | ||
584 | static struct srcu_struct srcu_ctl; | |
b2896d2e PM |
585 | |
586 | static void srcu_torture_init(void) | |
587 | { | |
588 | init_srcu_struct(&srcu_ctl); | |
e3033736 | 589 | rcu_sync_torture_init(); |
b2896d2e PM |
590 | } |
591 | ||
592 | static void srcu_torture_cleanup(void) | |
593 | { | |
594 | synchronize_srcu(&srcu_ctl); | |
595 | cleanup_srcu_struct(&srcu_ctl); | |
596 | } | |
597 | ||
012d3ca8 | 598 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
599 | { |
600 | return srcu_read_lock(&srcu_ctl); | |
601 | } | |
602 | ||
603 | static void srcu_read_delay(struct rcu_random_state *rrsp) | |
604 | { | |
605 | long delay; | |
606 | const long uspertick = 1000000 / HZ; | |
607 | const long longdelay = 10; | |
608 | ||
609 | /* We want there to be long-running readers, but not all the time. */ | |
610 | ||
611 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); | |
612 | if (!delay) | |
613 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
614 | else |
615 | rcu_read_delay(rrsp); | |
b2896d2e PM |
616 | } |
617 | ||
012d3ca8 | 618 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
619 | { |
620 | srcu_read_unlock(&srcu_ctl, idx); | |
621 | } | |
622 | ||
623 | static int srcu_torture_completed(void) | |
624 | { | |
625 | return srcu_batches_completed(&srcu_ctl); | |
626 | } | |
627 | ||
b772e1dd JT |
628 | static void srcu_torture_synchronize(void) |
629 | { | |
630 | synchronize_srcu(&srcu_ctl); | |
631 | } | |
632 | ||
b2896d2e PM |
633 | static int srcu_torture_stats(char *page) |
634 | { | |
635 | int cnt = 0; | |
636 | int cpu; | |
637 | int idx = srcu_ctl.completed & 0x1; | |
638 | ||
639 | cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", | |
640 | torture_type, TORTURE_FLAG, idx); | |
641 | for_each_possible_cpu(cpu) { | |
cef50120 | 642 | cnt += sprintf(&page[cnt], " %d(%lu,%lu)", cpu, |
b2896d2e PM |
643 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], |
644 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
645 | } | |
646 | cnt += sprintf(&page[cnt], "\n"); | |
647 | return cnt; | |
648 | } | |
649 | ||
650 | static struct rcu_torture_ops srcu_ops = { | |
0acc512c PM |
651 | .init = srcu_torture_init, |
652 | .cleanup = srcu_torture_cleanup, | |
653 | .readlock = srcu_torture_read_lock, | |
654 | .read_delay = srcu_read_delay, | |
655 | .readunlock = srcu_torture_read_unlock, | |
656 | .completed = srcu_torture_completed, | |
657 | .deferred_free = rcu_sync_torture_deferred_free, | |
658 | .sync = srcu_torture_synchronize, | |
fae4b54f | 659 | .call = NULL, |
0acc512c PM |
660 | .cb_barrier = NULL, |
661 | .stats = srcu_torture_stats, | |
662 | .name = "srcu" | |
b2896d2e PM |
663 | }; |
664 | ||
101db7b4 PM |
665 | static int srcu_torture_read_lock_raw(void) __acquires(&srcu_ctl) |
666 | { | |
667 | return srcu_read_lock_raw(&srcu_ctl); | |
668 | } | |
669 | ||
670 | static void srcu_torture_read_unlock_raw(int idx) __releases(&srcu_ctl) | |
671 | { | |
672 | srcu_read_unlock_raw(&srcu_ctl, idx); | |
673 | } | |
674 | ||
675 | static struct rcu_torture_ops srcu_raw_ops = { | |
676 | .init = srcu_torture_init, | |
677 | .cleanup = srcu_torture_cleanup, | |
678 | .readlock = srcu_torture_read_lock_raw, | |
679 | .read_delay = srcu_read_delay, | |
680 | .readunlock = srcu_torture_read_unlock_raw, | |
681 | .completed = srcu_torture_completed, | |
682 | .deferred_free = rcu_sync_torture_deferred_free, | |
683 | .sync = srcu_torture_synchronize, | |
fae4b54f | 684 | .call = NULL, |
101db7b4 PM |
685 | .cb_barrier = NULL, |
686 | .stats = srcu_torture_stats, | |
687 | .name = "srcu_raw" | |
688 | }; | |
689 | ||
804bb837 PM |
690 | static void srcu_torture_synchronize_expedited(void) |
691 | { | |
692 | synchronize_srcu_expedited(&srcu_ctl); | |
693 | } | |
694 | ||
695 | static struct rcu_torture_ops srcu_expedited_ops = { | |
696 | .init = srcu_torture_init, | |
697 | .cleanup = srcu_torture_cleanup, | |
698 | .readlock = srcu_torture_read_lock, | |
699 | .read_delay = srcu_read_delay, | |
700 | .readunlock = srcu_torture_read_unlock, | |
701 | .completed = srcu_torture_completed, | |
702 | .deferred_free = rcu_sync_torture_deferred_free, | |
703 | .sync = srcu_torture_synchronize_expedited, | |
fae4b54f | 704 | .call = NULL, |
804bb837 PM |
705 | .cb_barrier = NULL, |
706 | .stats = srcu_torture_stats, | |
707 | .name = "srcu_expedited" | |
708 | }; | |
709 | ||
4b6c2cca JT |
710 | /* |
711 | * Definitions for sched torture testing. | |
712 | */ | |
713 | ||
714 | static int sched_torture_read_lock(void) | |
715 | { | |
716 | preempt_disable(); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static void sched_torture_read_unlock(int idx) | |
721 | { | |
722 | preempt_enable(); | |
723 | } | |
724 | ||
2326974d PM |
725 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
726 | { | |
727 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
728 | } | |
729 | ||
4b6c2cca | 730 | static struct rcu_torture_ops sched_ops = { |
0acc512c PM |
731 | .init = rcu_sync_torture_init, |
732 | .cleanup = NULL, | |
733 | .readlock = sched_torture_read_lock, | |
734 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
735 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 736 | .completed = rcu_no_completed, |
0acc512c | 737 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 738 | .sync = synchronize_sched, |
0acc512c | 739 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 740 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
741 | .stats = NULL, |
742 | .irq_capable = 1, | |
743 | .name = "sched" | |
4b6c2cca JT |
744 | }; |
745 | ||
804bb837 | 746 | static struct rcu_torture_ops sched_sync_ops = { |
0acc512c PM |
747 | .init = rcu_sync_torture_init, |
748 | .cleanup = NULL, | |
749 | .readlock = sched_torture_read_lock, | |
750 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
751 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 752 | .completed = rcu_no_completed, |
0acc512c | 753 | .deferred_free = rcu_sync_torture_deferred_free, |
bdf2a436 | 754 | .sync = synchronize_sched, |
0acc512c | 755 | .cb_barrier = NULL, |
bf66f18e | 756 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
757 | .stats = NULL, |
758 | .name = "sched_sync" | |
759 | }; | |
760 | ||
0acc512c PM |
761 | static struct rcu_torture_ops sched_expedited_ops = { |
762 | .init = rcu_sync_torture_init, | |
763 | .cleanup = NULL, | |
764 | .readlock = sched_torture_read_lock, | |
765 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
766 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 767 | .completed = rcu_no_completed, |
0acc512c PM |
768 | .deferred_free = rcu_sync_torture_deferred_free, |
769 | .sync = synchronize_sched_expedited, | |
770 | .cb_barrier = NULL, | |
bf66f18e | 771 | .fqs = rcu_sched_force_quiescent_state, |
969c7921 | 772 | .stats = NULL, |
0acc512c PM |
773 | .irq_capable = 1, |
774 | .name = "sched_expedited" | |
2326974d PM |
775 | }; |
776 | ||
8e8be45e PM |
777 | /* |
778 | * RCU torture priority-boost testing. Runs one real-time thread per | |
779 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
780 | * spinning waiting for them to be invoked. If a given callback takes | |
781 | * too long to be invoked, we assume that priority inversion has occurred. | |
782 | */ | |
783 | ||
784 | struct rcu_boost_inflight { | |
785 | struct rcu_head rcu; | |
786 | int inflight; | |
787 | }; | |
788 | ||
789 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
790 | { | |
791 | struct rcu_boost_inflight *rbip = | |
792 | container_of(head, struct rcu_boost_inflight, rcu); | |
793 | ||
794 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
795 | rbip->inflight = 0; | |
796 | } | |
797 | ||
798 | static int rcu_torture_boost(void *arg) | |
799 | { | |
800 | unsigned long call_rcu_time; | |
801 | unsigned long endtime; | |
802 | unsigned long oldstarttime; | |
803 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
804 | struct sched_param sp; | |
805 | ||
806 | VERBOSE_PRINTK_STRING("rcu_torture_boost started"); | |
807 | ||
808 | /* Set real-time priority. */ | |
809 | sp.sched_priority = 1; | |
810 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
811 | VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); | |
812 | n_rcu_torture_boost_rterror++; | |
813 | } | |
814 | ||
561190e3 | 815 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
816 | /* Each pass through the following loop does one boost-test cycle. */ |
817 | do { | |
818 | /* Wait for the next test interval. */ | |
819 | oldstarttime = boost_starttime; | |
93898fb1 | 820 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
8e8be45e PM |
821 | schedule_timeout_uninterruptible(1); |
822 | rcu_stutter_wait("rcu_torture_boost"); | |
823 | if (kthread_should_stop() || | |
824 | fullstop != FULLSTOP_DONTSTOP) | |
825 | goto checkwait; | |
826 | } | |
827 | ||
828 | /* Do one boost-test interval. */ | |
829 | endtime = oldstarttime + test_boost_duration * HZ; | |
830 | call_rcu_time = jiffies; | |
93898fb1 | 831 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
832 | /* If we don't have a callback in flight, post one. */ |
833 | if (!rbi.inflight) { | |
834 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
835 | rbi.inflight = 1; | |
836 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
837 | if (jiffies - call_rcu_time > | |
838 | test_boost_duration * HZ - HZ / 2) { | |
839 | VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); | |
840 | n_rcu_torture_boost_failure++; | |
841 | } | |
842 | call_rcu_time = jiffies; | |
843 | } | |
844 | cond_resched(); | |
845 | rcu_stutter_wait("rcu_torture_boost"); | |
846 | if (kthread_should_stop() || | |
847 | fullstop != FULLSTOP_DONTSTOP) | |
848 | goto checkwait; | |
849 | } | |
850 | ||
851 | /* | |
852 | * Set the start time of the next test interval. | |
853 | * Yes, this is vulnerable to long delays, but such | |
854 | * delays simply cause a false negative for the next | |
855 | * interval. Besides, we are running at RT priority, | |
856 | * so delays should be relatively rare. | |
857 | */ | |
ab8f11e5 PM |
858 | while (oldstarttime == boost_starttime && |
859 | !kthread_should_stop()) { | |
8e8be45e PM |
860 | if (mutex_trylock(&boost_mutex)) { |
861 | boost_starttime = jiffies + | |
862 | test_boost_interval * HZ; | |
863 | n_rcu_torture_boosts++; | |
864 | mutex_unlock(&boost_mutex); | |
865 | break; | |
866 | } | |
867 | schedule_timeout_uninterruptible(1); | |
868 | } | |
869 | ||
870 | /* Go do the stutter. */ | |
871 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
872 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
873 | ||
874 | /* Clean up and exit. */ | |
875 | VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); | |
876 | rcutorture_shutdown_absorb("rcu_torture_boost"); | |
877 | while (!kthread_should_stop() || rbi.inflight) | |
878 | schedule_timeout_uninterruptible(1); | |
879 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 880 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
881 | return 0; |
882 | } | |
883 | ||
bf66f18e PM |
884 | /* |
885 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
886 | * bursts of calls to force_quiescent_state(), increasing the probability | |
887 | * of occurrence of some important types of race conditions. | |
888 | */ | |
889 | static int | |
890 | rcu_torture_fqs(void *arg) | |
891 | { | |
892 | unsigned long fqs_resume_time; | |
893 | int fqs_burst_remaining; | |
894 | ||
895 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); | |
896 | do { | |
897 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
898 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
899 | !kthread_should_stop()) { | |
bf66f18e PM |
900 | schedule_timeout_interruptible(1); |
901 | } | |
902 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
903 | while (fqs_burst_remaining > 0 && |
904 | !kthread_should_stop()) { | |
bf66f18e PM |
905 | cur_ops->fqs(); |
906 | udelay(fqs_holdoff); | |
907 | fqs_burst_remaining -= fqs_holdoff; | |
908 | } | |
909 | rcu_stutter_wait("rcu_torture_fqs"); | |
910 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
911 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); | |
912 | rcutorture_shutdown_absorb("rcu_torture_fqs"); | |
913 | while (!kthread_should_stop()) | |
914 | schedule_timeout_uninterruptible(1); | |
915 | return 0; | |
916 | } | |
917 | ||
a241ec65 PM |
918 | /* |
919 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
920 | * for that pointed to by rcu_torture_current, freeing the old structure | |
921 | * after a series of grace periods (the "pipeline"). | |
922 | */ | |
923 | static int | |
924 | rcu_torture_writer(void *arg) | |
925 | { | |
926 | int i; | |
927 | long oldbatch = rcu_batches_completed(); | |
928 | struct rcu_torture *rp; | |
929 | struct rcu_torture *old_rp; | |
930 | static DEFINE_RCU_RANDOM(rand); | |
931 | ||
932 | VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); | |
dbdf65b1 IM |
933 | set_user_nice(current, 19); |
934 | ||
a241ec65 PM |
935 | do { |
936 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
937 | rp = rcu_torture_alloc(); |
938 | if (rp == NULL) | |
a241ec65 PM |
939 | continue; |
940 | rp->rtort_pipe_count = 0; | |
941 | udelay(rcu_random(&rand) & 0x3ff); | |
0ddea0ea PM |
942 | old_rp = rcu_dereference_check(rcu_torture_current, |
943 | current == writer_task); | |
996417d2 | 944 | rp->rtort_mbtest = 1; |
a241ec65 | 945 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 946 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 947 | if (old_rp) { |
a241ec65 PM |
948 | i = old_rp->rtort_pipe_count; |
949 | if (i > RCU_TORTURE_PIPE_LEN) | |
950 | i = RCU_TORTURE_PIPE_LEN; | |
951 | atomic_inc(&rcu_torture_wcount[i]); | |
952 | old_rp->rtort_pipe_count++; | |
0acc512c | 953 | cur_ops->deferred_free(old_rp); |
a241ec65 | 954 | } |
4a298656 | 955 | rcutorture_record_progress(++rcu_torture_current_version); |
72e9bb54 | 956 | oldbatch = cur_ops->completed(); |
c9d557c1 PM |
957 | rcu_stutter_wait("rcu_torture_writer"); |
958 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 959 | VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c1 PM |
960 | rcutorture_shutdown_absorb("rcu_torture_writer"); |
961 | while (!kthread_should_stop()) | |
a241ec65 PM |
962 | schedule_timeout_uninterruptible(1); |
963 | return 0; | |
964 | } | |
965 | ||
b772e1dd JT |
966 | /* |
967 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
968 | * delay between calls. | |
969 | */ | |
970 | static int | |
971 | rcu_torture_fakewriter(void *arg) | |
972 | { | |
973 | DEFINE_RCU_RANDOM(rand); | |
974 | ||
975 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); | |
976 | set_user_nice(current, 19); | |
977 | ||
978 | do { | |
979 | schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); | |
980 | udelay(rcu_random(&rand) & 0x3ff); | |
981 | cur_ops->sync(); | |
c9d557c1 PM |
982 | rcu_stutter_wait("rcu_torture_fakewriter"); |
983 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd JT |
984 | |
985 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); | |
c9d557c1 PM |
986 | rcutorture_shutdown_absorb("rcu_torture_fakewriter"); |
987 | while (!kthread_should_stop()) | |
b772e1dd JT |
988 | schedule_timeout_uninterruptible(1); |
989 | return 0; | |
990 | } | |
991 | ||
91afaf30 PM |
992 | void rcutorture_trace_dump(void) |
993 | { | |
994 | static atomic_t beenhere = ATOMIC_INIT(0); | |
995 | ||
996 | if (atomic_read(&beenhere)) | |
997 | return; | |
998 | if (atomic_xchg(&beenhere, 1) != 0) | |
999 | return; | |
1000 | do_trace_rcu_torture_read(cur_ops->name, (struct rcu_head *)~0UL); | |
1001 | ftrace_dump(DUMP_ALL); | |
1002 | } | |
1003 | ||
0729fbf3 PM |
1004 | /* |
1005 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1006 | * incrementing the corresponding element of the pipeline array. The | |
1007 | * counter in the element should never be greater than 1, otherwise, the | |
1008 | * RCU implementation is broken. | |
1009 | */ | |
1010 | static void rcu_torture_timer(unsigned long unused) | |
1011 | { | |
1012 | int idx; | |
1013 | int completed; | |
1014 | static DEFINE_RCU_RANDOM(rand); | |
1015 | static DEFINE_SPINLOCK(rand_lock); | |
1016 | struct rcu_torture *p; | |
1017 | int pipe_count; | |
1018 | ||
1019 | idx = cur_ops->readlock(); | |
1020 | completed = cur_ops->completed(); | |
632ee200 | 1021 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1022 | rcu_read_lock_bh_held() || |
1023 | rcu_read_lock_sched_held() || | |
1024 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
1025 | if (p == NULL) { |
1026 | /* Leave because rcu_torture_writer is not yet underway */ | |
1027 | cur_ops->readunlock(idx); | |
1028 | return; | |
1029 | } | |
7129d383 | 1030 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu); |
0729fbf3 PM |
1031 | if (p->rtort_mbtest == 0) |
1032 | atomic_inc(&n_rcu_torture_mberror); | |
1033 | spin_lock(&rand_lock); | |
0acc512c | 1034 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1035 | n_rcu_torture_timers++; |
1036 | spin_unlock(&rand_lock); | |
1037 | preempt_disable(); | |
1038 | pipe_count = p->rtort_pipe_count; | |
1039 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1040 | /* Should not happen, but... */ | |
1041 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1042 | } | |
91afaf30 PM |
1043 | if (pipe_count > 1) |
1044 | rcutorture_trace_dump(); | |
dd17c8f7 | 1045 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
0729fbf3 PM |
1046 | completed = cur_ops->completed() - completed; |
1047 | if (completed > RCU_TORTURE_PIPE_LEN) { | |
1048 | /* Should not happen, but... */ | |
1049 | completed = RCU_TORTURE_PIPE_LEN; | |
1050 | } | |
dd17c8f7 | 1051 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1052 | preempt_enable(); |
1053 | cur_ops->readunlock(idx); | |
1054 | } | |
1055 | ||
a241ec65 PM |
1056 | /* |
1057 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1058 | * incrementing the corresponding element of the pipeline array. The | |
1059 | * counter in the element should never be greater than 1, otherwise, the | |
1060 | * RCU implementation is broken. | |
1061 | */ | |
1062 | static int | |
1063 | rcu_torture_reader(void *arg) | |
1064 | { | |
1065 | int completed; | |
72e9bb54 | 1066 | int idx; |
a241ec65 PM |
1067 | DEFINE_RCU_RANDOM(rand); |
1068 | struct rcu_torture *p; | |
1069 | int pipe_count; | |
0729fbf3 | 1070 | struct timer_list t; |
a241ec65 PM |
1071 | |
1072 | VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); | |
dbdf65b1 | 1073 | set_user_nice(current, 19); |
0acc512c | 1074 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1075 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1076 | |
a241ec65 | 1077 | do { |
0acc512c | 1078 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1079 | if (!timer_pending(&t)) |
6155fec9 | 1080 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1081 | } |
72e9bb54 PM |
1082 | idx = cur_ops->readlock(); |
1083 | completed = cur_ops->completed(); | |
632ee200 | 1084 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1085 | rcu_read_lock_bh_held() || |
1086 | rcu_read_lock_sched_held() || | |
1087 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
1088 | if (p == NULL) { |
1089 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1090 | cur_ops->readunlock(idx); |
a241ec65 PM |
1091 | schedule_timeout_interruptible(HZ); |
1092 | continue; | |
1093 | } | |
7129d383 | 1094 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu); |
996417d2 PM |
1095 | if (p->rtort_mbtest == 0) |
1096 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1097 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1098 | preempt_disable(); |
1099 | pipe_count = p->rtort_pipe_count; | |
1100 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1101 | /* Should not happen, but... */ | |
1102 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1103 | } | |
91afaf30 PM |
1104 | if (pipe_count > 1) |
1105 | rcutorture_trace_dump(); | |
dd17c8f7 | 1106 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
72e9bb54 | 1107 | completed = cur_ops->completed() - completed; |
a241ec65 PM |
1108 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1109 | /* Should not happen, but... */ | |
1110 | completed = RCU_TORTURE_PIPE_LEN; | |
1111 | } | |
dd17c8f7 | 1112 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1113 | preempt_enable(); |
72e9bb54 | 1114 | cur_ops->readunlock(idx); |
a241ec65 | 1115 | schedule(); |
c9d557c1 PM |
1116 | rcu_stutter_wait("rcu_torture_reader"); |
1117 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 1118 | VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c1 | 1119 | rcutorture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 1120 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1121 | del_timer_sync(&t); |
c9d557c1 | 1122 | while (!kthread_should_stop()) |
a241ec65 PM |
1123 | schedule_timeout_uninterruptible(1); |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Create an RCU-torture statistics message in the specified buffer. | |
1129 | */ | |
1130 | static int | |
1131 | rcu_torture_printk(char *page) | |
1132 | { | |
1133 | int cnt = 0; | |
1134 | int cpu; | |
1135 | int i; | |
1136 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1137 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1138 | ||
0a945022 | 1139 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1140 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1141 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1142 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1143 | } | |
1144 | } | |
1145 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1146 | if (pipesummary[i] != 0) | |
1147 | break; | |
1148 | } | |
72e9bb54 | 1149 | cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1150 | cnt += sprintf(&page[cnt], |
4a298656 | 1151 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d " |
67b98dba | 1152 | "rtmbe: %d rtbke: %ld rtbre: %ld " |
b58bdcca | 1153 | "rtbf: %ld rtb: %ld nt: %ld " |
fae4b54f PM |
1154 | "onoff: %ld/%ld:%ld/%ld " |
1155 | "barrier: %ld/%ld:%ld", | |
a241ec65 PM |
1156 | rcu_torture_current, |
1157 | rcu_torture_current_version, | |
1158 | list_empty(&rcu_torture_freelist), | |
1159 | atomic_read(&n_rcu_torture_alloc), | |
1160 | atomic_read(&n_rcu_torture_alloc_fail), | |
996417d2 | 1161 | atomic_read(&n_rcu_torture_free), |
0729fbf3 | 1162 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e PM |
1163 | n_rcu_torture_boost_ktrerror, |
1164 | n_rcu_torture_boost_rterror, | |
8e8be45e PM |
1165 | n_rcu_torture_boost_failure, |
1166 | n_rcu_torture_boosts, | |
b58bdcca PM |
1167 | n_rcu_torture_timers, |
1168 | n_online_successes, | |
1169 | n_online_attempts, | |
1170 | n_offline_successes, | |
fae4b54f PM |
1171 | n_offline_attempts, |
1172 | n_barrier_successes, | |
1173 | n_barrier_attempts, | |
1174 | n_rcu_torture_barrier_error); | |
1175 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1176 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1177 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1178 | n_rcu_torture_boost_ktrerror != 0 || |
1179 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1180 | n_rcu_torture_boost_failure != 0 || |
1181 | i > 1) { | |
a241ec65 | 1182 | cnt += sprintf(&page[cnt], "!!! "); |
996417d2 | 1183 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1184 | WARN_ON_ONCE(1); |
996417d2 | 1185 | } |
a241ec65 PM |
1186 | cnt += sprintf(&page[cnt], "Reader Pipe: "); |
1187 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) | |
1188 | cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); | |
72e9bb54 | 1189 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1190 | cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb54 | 1191 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65 | 1192 | cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb54 | 1193 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 PM |
1194 | cnt += sprintf(&page[cnt], "Free-Block Circulation: "); |
1195 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { | |
1196 | cnt += sprintf(&page[cnt], " %d", | |
1197 | atomic_read(&rcu_torture_wcount[i])); | |
1198 | } | |
1199 | cnt += sprintf(&page[cnt], "\n"); | |
c8e5b163 | 1200 | if (cur_ops->stats) |
72e9bb54 | 1201 | cnt += cur_ops->stats(&page[cnt]); |
a241ec65 PM |
1202 | return cnt; |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Print torture statistics. Caller must ensure that there is only | |
1207 | * one call to this function at a given time!!! This is normally | |
1208 | * accomplished by relying on the module system to only have one copy | |
1209 | * of the module loaded, and then by giving the rcu_torture_stats | |
1210 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1211 | * thread is not running). | |
1212 | */ | |
1213 | static void | |
1214 | rcu_torture_stats_print(void) | |
1215 | { | |
1216 | int cnt; | |
1217 | ||
1218 | cnt = rcu_torture_printk(printk_buf); | |
1219 | printk(KERN_ALERT "%s", printk_buf); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Periodically prints torture statistics, if periodic statistics printing | |
1224 | * was specified via the stat_interval module parameter. | |
1225 | * | |
1226 | * No need to worry about fullstop here, since this one doesn't reference | |
1227 | * volatile state or register callbacks. | |
1228 | */ | |
1229 | static int | |
1230 | rcu_torture_stats(void *arg) | |
1231 | { | |
1232 | VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); | |
1233 | do { | |
1234 | schedule_timeout_interruptible(stat_interval * HZ); | |
1235 | rcu_torture_stats_print(); | |
c9d557c1 PM |
1236 | rcutorture_shutdown_absorb("rcu_torture_stats"); |
1237 | } while (!kthread_should_stop()); | |
a241ec65 PM |
1238 | VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); |
1239 | return 0; | |
1240 | } | |
1241 | ||
d84f5203 SV |
1242 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
1243 | ||
1244 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case | |
1245 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. | |
1246 | */ | |
b2896d2e | 1247 | static void rcu_torture_shuffle_tasks(void) |
d84f5203 | 1248 | { |
d84f5203 SV |
1249 | int i; |
1250 | ||
73d0a4b1 | 1251 | cpumask_setall(shuffle_tmp_mask); |
86ef5c9a | 1252 | get_online_cpus(); |
d84f5203 SV |
1253 | |
1254 | /* No point in shuffling if there is only one online CPU (ex: UP) */ | |
c9d557c1 PM |
1255 | if (num_online_cpus() == 1) { |
1256 | put_online_cpus(); | |
1257 | return; | |
1258 | } | |
d84f5203 SV |
1259 | |
1260 | if (rcu_idle_cpu != -1) | |
73d0a4b1 | 1261 | cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f5203 | 1262 | |
73d0a4b1 | 1263 | set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f5203 | 1264 | |
c8e5b163 | 1265 | if (reader_tasks) { |
d84f5203 SV |
1266 | for (i = 0; i < nrealreaders; i++) |
1267 | if (reader_tasks[i]) | |
f70316da | 1268 | set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b1 | 1269 | shuffle_tmp_mask); |
d84f5203 SV |
1270 | } |
1271 | ||
c8e5b163 | 1272 | if (fakewriter_tasks) { |
b772e1dd JT |
1273 | for (i = 0; i < nfakewriters; i++) |
1274 | if (fakewriter_tasks[i]) | |
f70316da | 1275 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b1 | 1276 | shuffle_tmp_mask); |
b772e1dd JT |
1277 | } |
1278 | ||
d84f5203 | 1279 | if (writer_task) |
73d0a4b1 | 1280 | set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f5203 SV |
1281 | |
1282 | if (stats_task) | |
73d0a4b1 | 1283 | set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
d84f5203 SV |
1284 | |
1285 | if (rcu_idle_cpu == -1) | |
1286 | rcu_idle_cpu = num_online_cpus() - 1; | |
1287 | else | |
1288 | rcu_idle_cpu--; | |
1289 | ||
86ef5c9a | 1290 | put_online_cpus(); |
d84f5203 SV |
1291 | } |
1292 | ||
1293 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the | |
1294 | * system to become idle at a time and cut off its timer ticks. This is meant | |
1295 | * to test the support for such tickless idle CPU in RCU. | |
1296 | */ | |
1297 | static int | |
1298 | rcu_torture_shuffle(void *arg) | |
1299 | { | |
1300 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); | |
1301 | do { | |
1302 | schedule_timeout_interruptible(shuffle_interval * HZ); | |
1303 | rcu_torture_shuffle_tasks(); | |
c9d557c1 PM |
1304 | rcutorture_shutdown_absorb("rcu_torture_shuffle"); |
1305 | } while (!kthread_should_stop()); | |
d84f5203 SV |
1306 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); |
1307 | return 0; | |
1308 | } | |
1309 | ||
d120f65f PM |
1310 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1311 | * threads periodically. | |
1312 | */ | |
1313 | static int | |
1314 | rcu_torture_stutter(void *arg) | |
1315 | { | |
1316 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); | |
1317 | do { | |
1318 | schedule_timeout_interruptible(stutter * HZ); | |
1319 | stutter_pause_test = 1; | |
c9d557c1 | 1320 | if (!kthread_should_stop()) |
d120f65f PM |
1321 | schedule_timeout_interruptible(stutter * HZ); |
1322 | stutter_pause_test = 0; | |
c9d557c1 PM |
1323 | rcutorture_shutdown_absorb("rcu_torture_stutter"); |
1324 | } while (!kthread_should_stop()); | |
d120f65f PM |
1325 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); |
1326 | return 0; | |
1327 | } | |
1328 | ||
95c38322 | 1329 | static inline void |
8e8be45e | 1330 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, char *tag) |
95c38322 | 1331 | { |
b772e1dd JT |
1332 | printk(KERN_ALERT "%s" TORTURE_FLAG |
1333 | "--- %s: nreaders=%d nfakewriters=%d " | |
95c38322 | 1334 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " |
bf66f18e | 1335 | "shuffle_interval=%d stutter=%d irqreader=%d " |
8e8be45e PM |
1336 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " |
1337 | "test_boost=%d/%d test_boost_interval=%d " | |
b58bdcca | 1338 | "test_boost_duration=%d shutdown_secs=%d " |
9b9ec9b9 | 1339 | "onoff_interval=%d onoff_holdoff=%d\n", |
b772e1dd | 1340 | torture_type, tag, nrealreaders, nfakewriters, |
d120f65f | 1341 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
8e8be45e PM |
1342 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, |
1343 | test_boost, cur_ops->can_boost, | |
b58bdcca | 1344 | test_boost_interval, test_boost_duration, shutdown_secs, |
9b9ec9b9 | 1345 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1346 | } |
1347 | ||
8e8be45e | 1348 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1349 | .notifier_call = rcutorture_shutdown_notify, |
1350 | }; | |
1351 | ||
8e8be45e PM |
1352 | static void rcutorture_booster_cleanup(int cpu) |
1353 | { | |
1354 | struct task_struct *t; | |
1355 | ||
1356 | if (boost_tasks[cpu] == NULL) | |
1357 | return; | |
1358 | mutex_lock(&boost_mutex); | |
1359 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); | |
1360 | t = boost_tasks[cpu]; | |
1361 | boost_tasks[cpu] = NULL; | |
1362 | mutex_unlock(&boost_mutex); | |
1363 | ||
1364 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1365 | kthread_stop(t); | |
37e377d2 | 1366 | boost_tasks[cpu] = NULL; |
8e8be45e PM |
1367 | } |
1368 | ||
1369 | static int rcutorture_booster_init(int cpu) | |
1370 | { | |
1371 | int retval; | |
1372 | ||
1373 | if (boost_tasks[cpu] != NULL) | |
1374 | return 0; /* Already created, nothing more to do. */ | |
1375 | ||
1376 | /* Don't allow time recalculation while creating a new task. */ | |
1377 | mutex_lock(&boost_mutex); | |
1378 | VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); | |
1f288094 ED |
1379 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1380 | cpu_to_node(cpu), | |
1381 | "rcu_torture_boost"); | |
8e8be45e PM |
1382 | if (IS_ERR(boost_tasks[cpu])) { |
1383 | retval = PTR_ERR(boost_tasks[cpu]); | |
1384 | VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); | |
1385 | n_rcu_torture_boost_ktrerror++; | |
1386 | boost_tasks[cpu] = NULL; | |
1387 | mutex_unlock(&boost_mutex); | |
1388 | return retval; | |
1389 | } | |
1390 | kthread_bind(boost_tasks[cpu], cpu); | |
1391 | wake_up_process(boost_tasks[cpu]); | |
1392 | mutex_unlock(&boost_mutex); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
d5f546d8 PM |
1396 | /* |
1397 | * Cause the rcutorture test to shutdown the system after the test has | |
1398 | * run for the time specified by the shutdown_secs module parameter. | |
1399 | */ | |
1400 | static int | |
1401 | rcu_torture_shutdown(void *arg) | |
1402 | { | |
1403 | long delta; | |
1404 | unsigned long jiffies_snap; | |
1405 | ||
1406 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task started"); | |
1407 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1408 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1409 | !kthread_should_stop()) { | |
1410 | delta = shutdown_time - jiffies_snap; | |
1411 | if (verbose) | |
1412 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1413 | "rcu_torture_shutdown task: %lu " | |
1414 | "jiffies remaining\n", | |
1415 | torture_type, delta); | |
1416 | schedule_timeout_interruptible(delta); | |
1417 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1418 | } | |
b58bdcca | 1419 | if (kthread_should_stop()) { |
d5f546d8 PM |
1420 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task stopping"); |
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | /* OK, shut down the system. */ | |
1425 | ||
1426 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task shutting down system"); | |
1427 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ | |
1428 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1429 | kernel_power_off(); /* Shut down the system. */ | |
1430 | return 0; | |
1431 | } | |
1432 | ||
b58bdcca PM |
1433 | #ifdef CONFIG_HOTPLUG_CPU |
1434 | ||
1435 | /* | |
1436 | * Execute random CPU-hotplug operations at the interval specified | |
1437 | * by the onoff_interval. | |
1438 | */ | |
44100306 | 1439 | static int __cpuinit |
b58bdcca PM |
1440 | rcu_torture_onoff(void *arg) |
1441 | { | |
1442 | int cpu; | |
1443 | int maxcpu = -1; | |
1444 | DEFINE_RCU_RANDOM(rand); | |
1445 | ||
1446 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task started"); | |
1447 | for_each_online_cpu(cpu) | |
1448 | maxcpu = cpu; | |
1449 | WARN_ON(maxcpu < 0); | |
9b9ec9b9 PM |
1450 | if (onoff_holdoff > 0) { |
1451 | VERBOSE_PRINTK_STRING("rcu_torture_onoff begin holdoff"); | |
1452 | schedule_timeout_interruptible(onoff_holdoff * HZ); | |
1453 | VERBOSE_PRINTK_STRING("rcu_torture_onoff end holdoff"); | |
1454 | } | |
b58bdcca PM |
1455 | while (!kthread_should_stop()) { |
1456 | cpu = (rcu_random(&rand) >> 4) % (maxcpu + 1); | |
f220242a | 1457 | if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdcca PM |
1458 | if (verbose) |
1459 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1460 | "rcu_torture_onoff task: offlining %d\n", | |
1461 | torture_type, cpu); | |
1462 | n_offline_attempts++; | |
1463 | if (cpu_down(cpu) == 0) { | |
1464 | if (verbose) | |
1465 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1466 | "rcu_torture_onoff task: " | |
1467 | "offlined %d\n", | |
1468 | torture_type, cpu); | |
1469 | n_offline_successes++; | |
1470 | } | |
f220242a | 1471 | } else if (cpu_is_hotpluggable(cpu)) { |
b58bdcca PM |
1472 | if (verbose) |
1473 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1474 | "rcu_torture_onoff task: onlining %d\n", | |
1475 | torture_type, cpu); | |
1476 | n_online_attempts++; | |
1477 | if (cpu_up(cpu) == 0) { | |
1478 | if (verbose) | |
1479 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1480 | "rcu_torture_onoff task: " | |
1481 | "onlined %d\n", | |
1482 | torture_type, cpu); | |
1483 | n_online_successes++; | |
1484 | } | |
1485 | } | |
1486 | schedule_timeout_interruptible(onoff_interval * HZ); | |
1487 | } | |
1488 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task stopping"); | |
1489 | return 0; | |
1490 | } | |
1491 | ||
44100306 | 1492 | static int __cpuinit |
b58bdcca PM |
1493 | rcu_torture_onoff_init(void) |
1494 | { | |
3c1b1ce0 JL |
1495 | int ret; |
1496 | ||
b58bdcca PM |
1497 | if (onoff_interval <= 0) |
1498 | return 0; | |
1499 | onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); | |
1500 | if (IS_ERR(onoff_task)) { | |
3c1b1ce0 | 1501 | ret = PTR_ERR(onoff_task); |
b58bdcca | 1502 | onoff_task = NULL; |
3c1b1ce0 | 1503 | return ret; |
b58bdcca PM |
1504 | } |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static void rcu_torture_onoff_cleanup(void) | |
1509 | { | |
1510 | if (onoff_task == NULL) | |
1511 | return; | |
1512 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_onoff task"); | |
1513 | kthread_stop(onoff_task); | |
37e377d2 | 1514 | onoff_task = NULL; |
b58bdcca PM |
1515 | } |
1516 | ||
1517 | #else /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1518 | ||
37e377d2 | 1519 | static int |
b58bdcca PM |
1520 | rcu_torture_onoff_init(void) |
1521 | { | |
37e377d2 | 1522 | return 0; |
b58bdcca PM |
1523 | } |
1524 | ||
1525 | static void rcu_torture_onoff_cleanup(void) | |
1526 | { | |
1527 | } | |
1528 | ||
1529 | #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ | |
1530 | ||
c13f3757 PM |
1531 | /* |
1532 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1533 | * induces a CPU stall for the time specified by stall_cpu. | |
1534 | */ | |
1535 | static int __cpuinit rcu_torture_stall(void *args) | |
1536 | { | |
1537 | unsigned long stop_at; | |
1538 | ||
1539 | VERBOSE_PRINTK_STRING("rcu_torture_stall task started"); | |
1540 | if (stall_cpu_holdoff > 0) { | |
1541 | VERBOSE_PRINTK_STRING("rcu_torture_stall begin holdoff"); | |
1542 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); | |
1543 | VERBOSE_PRINTK_STRING("rcu_torture_stall end holdoff"); | |
1544 | } | |
1545 | if (!kthread_should_stop()) { | |
1546 | stop_at = get_seconds() + stall_cpu; | |
1547 | /* RCU CPU stall is expected behavior in following code. */ | |
1548 | printk(KERN_ALERT "rcu_torture_stall start.\n"); | |
1549 | rcu_read_lock(); | |
1550 | preempt_disable(); | |
1551 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1552 | continue; /* Induce RCU CPU stall warning. */ | |
1553 | preempt_enable(); | |
1554 | rcu_read_unlock(); | |
1555 | printk(KERN_ALERT "rcu_torture_stall end.\n"); | |
1556 | } | |
1557 | rcutorture_shutdown_absorb("rcu_torture_stall"); | |
1558 | while (!kthread_should_stop()) | |
1559 | schedule_timeout_interruptible(10 * HZ); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1564 | static int __init rcu_torture_stall_init(void) | |
1565 | { | |
1566 | int ret; | |
1567 | ||
1568 | if (stall_cpu <= 0) | |
1569 | return 0; | |
1570 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1571 | if (IS_ERR(stall_task)) { | |
1572 | ret = PTR_ERR(stall_task); | |
1573 | stall_task = NULL; | |
1574 | return ret; | |
1575 | } | |
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1580 | static void rcu_torture_stall_cleanup(void) | |
1581 | { | |
1582 | if (stall_task == NULL) | |
1583 | return; | |
1584 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stall_task."); | |
1585 | kthread_stop(stall_task); | |
37e377d2 | 1586 | stall_task = NULL; |
c13f3757 PM |
1587 | } |
1588 | ||
fae4b54f PM |
1589 | /* Callback function for RCU barrier testing. */ |
1590 | void rcu_torture_barrier_cbf(struct rcu_head *rcu) | |
1591 | { | |
1592 | atomic_inc(&barrier_cbs_invoked); | |
1593 | } | |
1594 | ||
1595 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1596 | static int rcu_torture_barrier_cbs(void *arg) | |
1597 | { | |
1598 | long myid = (long)arg; | |
1599 | struct rcu_head rcu; | |
1600 | ||
1601 | init_rcu_head_on_stack(&rcu); | |
1602 | VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task started"); | |
1603 | set_user_nice(current, 19); | |
1604 | do { | |
1605 | wait_event(barrier_cbs_wq[myid], | |
1606 | atomic_read(&barrier_cbs_count) == n_barrier_cbs || | |
1607 | kthread_should_stop() || | |
1608 | fullstop != FULLSTOP_DONTSTOP); | |
1609 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1610 | break; | |
1611 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); | |
1612 | if (atomic_dec_and_test(&barrier_cbs_count)) | |
1613 | wake_up(&barrier_wq); | |
1614 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
1615 | VERBOSE_PRINTK_STRING("rcu_torture_barrier_cbs task stopping"); | |
1616 | rcutorture_shutdown_absorb("rcu_torture_barrier_cbs"); | |
1617 | while (!kthread_should_stop()) | |
1618 | schedule_timeout_interruptible(1); | |
1619 | cur_ops->cb_barrier(); | |
1620 | destroy_rcu_head_on_stack(&rcu); | |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1625 | static int rcu_torture_barrier(void *arg) | |
1626 | { | |
1627 | int i; | |
1628 | ||
1629 | VERBOSE_PRINTK_STRING("rcu_torture_barrier task starting"); | |
1630 | do { | |
1631 | atomic_set(&barrier_cbs_invoked, 0); | |
1632 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
1633 | /* wake_up() path contains the required barriers. */ | |
1634 | for (i = 0; i < n_barrier_cbs; i++) | |
1635 | wake_up(&barrier_cbs_wq[i]); | |
1636 | wait_event(barrier_wq, | |
1637 | atomic_read(&barrier_cbs_count) == 0 || | |
1638 | kthread_should_stop() || | |
1639 | fullstop != FULLSTOP_DONTSTOP); | |
1640 | if (kthread_should_stop() || fullstop != FULLSTOP_DONTSTOP) | |
1641 | break; | |
1642 | n_barrier_attempts++; | |
1643 | cur_ops->cb_barrier(); | |
1644 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { | |
1645 | n_rcu_torture_barrier_error++; | |
1646 | WARN_ON_ONCE(1); | |
1647 | } | |
1648 | n_barrier_successes++; | |
1649 | schedule_timeout_interruptible(HZ / 10); | |
1650 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
1651 | VERBOSE_PRINTK_STRING("rcu_torture_barrier task stopping"); | |
1652 | rcutorture_shutdown_absorb("rcu_torture_barrier_cbs"); | |
1653 | while (!kthread_should_stop()) | |
1654 | schedule_timeout_interruptible(1); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | /* Initialize RCU barrier testing. */ | |
1659 | static int rcu_torture_barrier_init(void) | |
1660 | { | |
1661 | int i; | |
1662 | int ret; | |
1663 | ||
1664 | if (n_barrier_cbs == 0) | |
1665 | return 0; | |
1666 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
1667 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1668 | " Call or barrier ops missing for %s,\n", | |
1669 | torture_type, cur_ops->name); | |
1670 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1671 | " RCU barrier testing omitted from run.\n", | |
1672 | torture_type); | |
1673 | return 0; | |
1674 | } | |
1675 | atomic_set(&barrier_cbs_count, 0); | |
1676 | atomic_set(&barrier_cbs_invoked, 0); | |
1677 | barrier_cbs_tasks = | |
1678 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_tasks[0]), | |
1679 | GFP_KERNEL); | |
1680 | barrier_cbs_wq = | |
1681 | kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]), | |
1682 | GFP_KERNEL); | |
1683 | if (barrier_cbs_tasks == NULL || barrier_cbs_wq == 0) | |
1684 | return -ENOMEM; | |
1685 | for (i = 0; i < n_barrier_cbs; i++) { | |
1686 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
1687 | barrier_cbs_tasks[i] = kthread_run(rcu_torture_barrier_cbs, | |
1688 | (void *)i, | |
1689 | "rcu_torture_barrier_cbs"); | |
1690 | if (IS_ERR(barrier_cbs_tasks[i])) { | |
1691 | ret = PTR_ERR(barrier_cbs_tasks[i]); | |
1692 | VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier_cbs"); | |
1693 | barrier_cbs_tasks[i] = NULL; | |
1694 | return ret; | |
1695 | } | |
1696 | } | |
1697 | barrier_task = kthread_run(rcu_torture_barrier, NULL, | |
1698 | "rcu_torture_barrier"); | |
1699 | if (IS_ERR(barrier_task)) { | |
1700 | ret = PTR_ERR(barrier_task); | |
1701 | VERBOSE_PRINTK_ERRSTRING("Failed to create rcu_torture_barrier"); | |
1702 | barrier_task = NULL; | |
1703 | } | |
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* Clean up after RCU barrier testing. */ | |
1708 | static void rcu_torture_barrier_cleanup(void) | |
1709 | { | |
1710 | int i; | |
1711 | ||
1712 | if (barrier_task != NULL) { | |
1713 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier task"); | |
1714 | kthread_stop(barrier_task); | |
1715 | barrier_task = NULL; | |
1716 | } | |
1717 | if (barrier_cbs_tasks != NULL) { | |
1718 | for (i = 0; i < n_barrier_cbs; i++) { | |
1719 | if (barrier_cbs_tasks[i] != NULL) { | |
1720 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_barrier_cbs task"); | |
1721 | kthread_stop(barrier_cbs_tasks[i]); | |
1722 | barrier_cbs_tasks[i] = NULL; | |
1723 | } | |
1724 | } | |
1725 | kfree(barrier_cbs_tasks); | |
1726 | barrier_cbs_tasks = NULL; | |
1727 | } | |
1728 | if (barrier_cbs_wq != NULL) { | |
1729 | kfree(barrier_cbs_wq); | |
1730 | barrier_cbs_wq = NULL; | |
1731 | } | |
1732 | } | |
1733 | ||
8e8be45e PM |
1734 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1735 | unsigned long action, void *hcpu) | |
1736 | { | |
1737 | long cpu = (long)hcpu; | |
1738 | ||
1739 | switch (action) { | |
1740 | case CPU_ONLINE: | |
1741 | case CPU_DOWN_FAILED: | |
1742 | (void)rcutorture_booster_init(cpu); | |
1743 | break; | |
1744 | case CPU_DOWN_PREPARE: | |
1745 | rcutorture_booster_cleanup(cpu); | |
1746 | break; | |
1747 | default: | |
1748 | break; | |
1749 | } | |
1750 | return NOTIFY_OK; | |
1751 | } | |
1752 | ||
1753 | static struct notifier_block rcutorture_cpu_nb = { | |
1754 | .notifier_call = rcutorture_cpu_notify, | |
1755 | }; | |
1756 | ||
a241ec65 PM |
1757 | static void |
1758 | rcu_torture_cleanup(void) | |
1759 | { | |
1760 | int i; | |
1761 | ||
343e9099 | 1762 | mutex_lock(&fullstop_mutex); |
4a298656 | 1763 | rcutorture_record_test_transition(); |
c9d557c1 PM |
1764 | if (fullstop == FULLSTOP_SHUTDOWN) { |
1765 | printk(KERN_WARNING /* but going down anyway, so... */ | |
1766 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); | |
343e9099 | 1767 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1768 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1769 | if (cur_ops->cb_barrier != NULL) |
1770 | cur_ops->cb_barrier(); | |
1771 | return; | |
1772 | } | |
c9d557c1 | 1773 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1774 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1775 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
fae4b54f | 1776 | rcu_torture_barrier_cleanup(); |
c13f3757 | 1777 | rcu_torture_stall_cleanup(); |
d120f65f PM |
1778 | if (stutter_task) { |
1779 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); | |
1780 | kthread_stop(stutter_task); | |
1781 | } | |
1782 | stutter_task = NULL; | |
c8e5b163 | 1783 | if (shuffler_task) { |
d84f5203 SV |
1784 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); |
1785 | kthread_stop(shuffler_task); | |
73d0a4b1 | 1786 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
1787 | } |
1788 | shuffler_task = NULL; | |
1789 | ||
c8e5b163 | 1790 | if (writer_task) { |
a241ec65 PM |
1791 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); |
1792 | kthread_stop(writer_task); | |
1793 | } | |
1794 | writer_task = NULL; | |
1795 | ||
c8e5b163 | 1796 | if (reader_tasks) { |
a241ec65 | 1797 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1798 | if (reader_tasks[i]) { |
a241ec65 PM |
1799 | VERBOSE_PRINTK_STRING( |
1800 | "Stopping rcu_torture_reader task"); | |
1801 | kthread_stop(reader_tasks[i]); | |
1802 | } | |
1803 | reader_tasks[i] = NULL; | |
1804 | } | |
1805 | kfree(reader_tasks); | |
1806 | reader_tasks = NULL; | |
1807 | } | |
1808 | rcu_torture_current = NULL; | |
1809 | ||
c8e5b163 | 1810 | if (fakewriter_tasks) { |
b772e1dd | 1811 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1812 | if (fakewriter_tasks[i]) { |
b772e1dd JT |
1813 | VERBOSE_PRINTK_STRING( |
1814 | "Stopping rcu_torture_fakewriter task"); | |
1815 | kthread_stop(fakewriter_tasks[i]); | |
1816 | } | |
1817 | fakewriter_tasks[i] = NULL; | |
1818 | } | |
1819 | kfree(fakewriter_tasks); | |
1820 | fakewriter_tasks = NULL; | |
1821 | } | |
1822 | ||
c8e5b163 | 1823 | if (stats_task) { |
a241ec65 PM |
1824 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); |
1825 | kthread_stop(stats_task); | |
1826 | } | |
1827 | stats_task = NULL; | |
1828 | ||
bf66f18e PM |
1829 | if (fqs_task) { |
1830 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); | |
1831 | kthread_stop(fqs_task); | |
1832 | } | |
1833 | fqs_task = NULL; | |
8e8be45e PM |
1834 | if ((test_boost == 1 && cur_ops->can_boost) || |
1835 | test_boost == 2) { | |
1836 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1837 | for_each_possible_cpu(i) | |
1838 | rcutorture_booster_cleanup(i); | |
1839 | } | |
d5f546d8 PM |
1840 | if (shutdown_task != NULL) { |
1841 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shutdown task"); | |
1842 | kthread_stop(shutdown_task); | |
1843 | } | |
37e377d2 | 1844 | shutdown_task = NULL; |
b58bdcca | 1845 | rcu_torture_onoff_cleanup(); |
bf66f18e | 1846 | |
a241ec65 | 1847 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1848 | |
1849 | if (cur_ops->cb_barrier != NULL) | |
1850 | cur_ops->cb_barrier(); | |
a241ec65 | 1851 | |
a241ec65 | 1852 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1853 | |
c8e5b163 | 1854 | if (cur_ops->cleanup) |
72e9bb54 | 1855 | cur_ops->cleanup(); |
fae4b54f | 1856 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 1857 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bb PM |
1858 | else if (n_online_successes != n_online_attempts || |
1859 | n_offline_successes != n_offline_attempts) | |
1860 | rcu_torture_print_module_parms(cur_ops, | |
1861 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1862 | else |
8e8be45e | 1863 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1864 | } |
1865 | ||
6f8bc500 | 1866 | static int __init |
a241ec65 PM |
1867 | rcu_torture_init(void) |
1868 | { | |
1869 | int i; | |
1870 | int cpu; | |
1871 | int firsterr = 0; | |
fae4b54f | 1872 | int retval; |
ade5fb81 | 1873 | static struct rcu_torture_ops *torture_ops[] = |
d9a3da06 | 1874 | { &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, |
bdf2a436 | 1875 | &rcu_bh_ops, &rcu_bh_sync_ops, &rcu_bh_expedited_ops, |
101db7b4 | 1876 | &srcu_ops, &srcu_raw_ops, &srcu_expedited_ops, |
804bb837 | 1877 | &sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
a241ec65 | 1878 | |
343e9099 PM |
1879 | mutex_lock(&fullstop_mutex); |
1880 | ||
a241ec65 | 1881 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1882 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1883 | cur_ops = torture_ops[i]; |
ade5fb81 | 1884 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1885 | break; |
72e9bb54 | 1886 | } |
ade5fb81 | 1887 | if (i == ARRAY_SIZE(torture_ops)) { |
cf886c44 | 1888 | printk(KERN_ALERT "rcu-torture: invalid torture type: \"%s\"\n", |
72e9bb54 | 1889 | torture_type); |
cf886c44 PM |
1890 | printk(KERN_ALERT "rcu-torture types:"); |
1891 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) | |
1892 | printk(KERN_ALERT " %s", torture_ops[i]->name); | |
1893 | printk(KERN_ALERT "\n"); | |
343e9099 | 1894 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 1895 | return -EINVAL; |
72e9bb54 | 1896 | } |
bf66f18e PM |
1897 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
1898 | printk(KERN_ALERT "rcu-torture: ->fqs NULL and non-zero " | |
1899 | "fqs_duration, fqs disabled.\n"); | |
1900 | fqs_duration = 0; | |
1901 | } | |
c8e5b163 | 1902 | if (cur_ops->init) |
72e9bb54 PM |
1903 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1904 | ||
a241ec65 PM |
1905 | if (nreaders >= 0) |
1906 | nrealreaders = nreaders; | |
1907 | else | |
1908 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 1909 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 1910 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
1911 | |
1912 | /* Set up the freelist. */ | |
1913 | ||
1914 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1915 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1916 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1917 | list_add_tail(&rcu_tortures[i].rtort_free, |
1918 | &rcu_torture_freelist); | |
1919 | } | |
1920 | ||
1921 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1922 | ||
1923 | rcu_torture_current = NULL; | |
1924 | rcu_torture_current_version = 0; | |
1925 | atomic_set(&n_rcu_torture_alloc, 0); | |
1926 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1927 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1928 | atomic_set(&n_rcu_torture_mberror, 0); |
1929 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 1930 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
1931 | n_rcu_torture_boost_ktrerror = 0; |
1932 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1933 | n_rcu_torture_boost_failure = 0; |
1934 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1935 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1936 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1937 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1938 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1939 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1940 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | /* Start up the kthreads. */ | |
1945 | ||
1946 | VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); | |
1947 | writer_task = kthread_run(rcu_torture_writer, NULL, | |
1948 | "rcu_torture_writer"); | |
1949 | if (IS_ERR(writer_task)) { | |
1950 | firsterr = PTR_ERR(writer_task); | |
1951 | VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); | |
1952 | writer_task = NULL; | |
1953 | goto unwind; | |
1954 | } | |
b772e1dd | 1955 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1956 | GFP_KERNEL); |
b772e1dd JT |
1957 | if (fakewriter_tasks == NULL) { |
1958 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1959 | firsterr = -ENOMEM; | |
1960 | goto unwind; | |
1961 | } | |
1962 | for (i = 0; i < nfakewriters; i++) { | |
1963 | VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); | |
1964 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, | |
a71fca58 | 1965 | "rcu_torture_fakewriter"); |
b772e1dd JT |
1966 | if (IS_ERR(fakewriter_tasks[i])) { |
1967 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
1968 | VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); | |
1969 | fakewriter_tasks[i] = NULL; | |
1970 | goto unwind; | |
1971 | } | |
1972 | } | |
2860aaba | 1973 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1974 | GFP_KERNEL); |
1975 | if (reader_tasks == NULL) { | |
1976 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1977 | firsterr = -ENOMEM; | |
1978 | goto unwind; | |
1979 | } | |
1980 | for (i = 0; i < nrealreaders; i++) { | |
1981 | VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); | |
1982 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, | |
1983 | "rcu_torture_reader"); | |
1984 | if (IS_ERR(reader_tasks[i])) { | |
1985 | firsterr = PTR_ERR(reader_tasks[i]); | |
1986 | VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); | |
1987 | reader_tasks[i] = NULL; | |
1988 | goto unwind; | |
1989 | } | |
1990 | } | |
1991 | if (stat_interval > 0) { | |
1992 | VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); | |
1993 | stats_task = kthread_run(rcu_torture_stats, NULL, | |
1994 | "rcu_torture_stats"); | |
1995 | if (IS_ERR(stats_task)) { | |
1996 | firsterr = PTR_ERR(stats_task); | |
1997 | VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); | |
1998 | stats_task = NULL; | |
1999 | goto unwind; | |
2000 | } | |
2001 | } | |
d84f5203 SV |
2002 | if (test_no_idle_hz) { |
2003 | rcu_idle_cpu = num_online_cpus() - 1; | |
73d0a4b1 RR |
2004 | |
2005 | if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { | |
2006 | firsterr = -ENOMEM; | |
2007 | VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); | |
2008 | goto unwind; | |
2009 | } | |
2010 | ||
d84f5203 SV |
2011 | /* Create the shuffler thread */ |
2012 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, | |
2013 | "rcu_torture_shuffle"); | |
2014 | if (IS_ERR(shuffler_task)) { | |
73d0a4b1 | 2015 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
2016 | firsterr = PTR_ERR(shuffler_task); |
2017 | VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); | |
2018 | shuffler_task = NULL; | |
2019 | goto unwind; | |
2020 | } | |
2021 | } | |
d120f65f PM |
2022 | if (stutter < 0) |
2023 | stutter = 0; | |
2024 | if (stutter) { | |
2025 | /* Create the stutter thread */ | |
2026 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
2027 | "rcu_torture_stutter"); | |
2028 | if (IS_ERR(stutter_task)) { | |
2029 | firsterr = PTR_ERR(stutter_task); | |
2030 | VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); | |
2031 | stutter_task = NULL; | |
2032 | goto unwind; | |
2033 | } | |
2034 | } | |
bf66f18e PM |
2035 | if (fqs_duration < 0) |
2036 | fqs_duration = 0; | |
2037 | if (fqs_duration) { | |
2038 | /* Create the stutter thread */ | |
2039 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
2040 | "rcu_torture_fqs"); | |
2041 | if (IS_ERR(fqs_task)) { | |
2042 | firsterr = PTR_ERR(fqs_task); | |
2043 | VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); | |
2044 | fqs_task = NULL; | |
2045 | goto unwind; | |
2046 | } | |
2047 | } | |
8e8be45e PM |
2048 | if (test_boost_interval < 1) |
2049 | test_boost_interval = 1; | |
2050 | if (test_boost_duration < 2) | |
2051 | test_boost_duration = 2; | |
2052 | if ((test_boost == 1 && cur_ops->can_boost) || | |
2053 | test_boost == 2) { | |
8e8be45e PM |
2054 | |
2055 | boost_starttime = jiffies + test_boost_interval * HZ; | |
2056 | register_cpu_notifier(&rcutorture_cpu_nb); | |
2057 | for_each_possible_cpu(i) { | |
2058 | if (cpu_is_offline(i)) | |
2059 | continue; /* Heuristic: CPU can go offline. */ | |
2060 | retval = rcutorture_booster_init(i); | |
2061 | if (retval < 0) { | |
2062 | firsterr = retval; | |
2063 | goto unwind; | |
2064 | } | |
2065 | } | |
2066 | } | |
d5f546d8 PM |
2067 | if (shutdown_secs > 0) { |
2068 | shutdown_time = jiffies + shutdown_secs * HZ; | |
2069 | shutdown_task = kthread_run(rcu_torture_shutdown, NULL, | |
2070 | "rcu_torture_shutdown"); | |
2071 | if (IS_ERR(shutdown_task)) { | |
2072 | firsterr = PTR_ERR(shutdown_task); | |
2073 | VERBOSE_PRINTK_ERRSTRING("Failed to create shutdown"); | |
2074 | shutdown_task = NULL; | |
2075 | goto unwind; | |
2076 | } | |
2077 | } | |
37e377d2 PM |
2078 | i = rcu_torture_onoff_init(); |
2079 | if (i != 0) { | |
2080 | firsterr = i; | |
2081 | goto unwind; | |
2082 | } | |
8e8be45e | 2083 | register_reboot_notifier(&rcutorture_shutdown_nb); |
37e377d2 PM |
2084 | i = rcu_torture_stall_init(); |
2085 | if (i != 0) { | |
2086 | firsterr = i; | |
2087 | goto unwind; | |
2088 | } | |
fae4b54f PM |
2089 | retval = rcu_torture_barrier_init(); |
2090 | if (retval != 0) { | |
2091 | firsterr = retval; | |
2092 | goto unwind; | |
2093 | } | |
4a298656 | 2094 | rcutorture_record_test_transition(); |
343e9099 | 2095 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2096 | return 0; |
2097 | ||
2098 | unwind: | |
343e9099 | 2099 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
2100 | rcu_torture_cleanup(); |
2101 | return firsterr; | |
2102 | } | |
2103 | ||
2104 | module_init(rcu_torture_init); | |
2105 | module_exit(rcu_torture_cleanup); |