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 | |
87de1cfd PM |
15 | * along with this program; if not, you can access it online at |
16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
a241ec65 | 17 | * |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
e0198b29 | 21 | * Josh Triplett <josh@joshtriplett.org> |
a241ec65 PM |
22 | * |
23 | * See also: Documentation/RCU/torture.txt | |
24 | */ | |
60500037 PM |
25 | |
26 | #define pr_fmt(fmt) fmt | |
27 | ||
a241ec65 PM |
28 | #include <linux/types.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/kthread.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/smp.h> | |
36 | #include <linux/rcupdate.h> | |
37 | #include <linux/interrupt.h> | |
174cd4b1 | 38 | #include <linux/sched/signal.h> |
ae7e81c0 | 39 | #include <uapi/linux/sched/types.h> |
60063497 | 40 | #include <linux/atomic.h> |
a241ec65 | 41 | #include <linux/bitops.h> |
a241ec65 PM |
42 | #include <linux/completion.h> |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/percpu.h> | |
45 | #include <linux/notifier.h> | |
343e9099 | 46 | #include <linux/reboot.h> |
83144186 | 47 | #include <linux/freezer.h> |
a241ec65 | 48 | #include <linux/cpu.h> |
a241ec65 | 49 | #include <linux/delay.h> |
a241ec65 | 50 | #include <linux/stat.h> |
b2896d2e | 51 | #include <linux/srcu.h> |
1aeb272c | 52 | #include <linux/slab.h> |
52494535 | 53 | #include <linux/trace_clock.h> |
f07767fd | 54 | #include <asm/byteorder.h> |
51b1130e | 55 | #include <linux/torture.h> |
38706bc5 | 56 | #include <linux/vmalloc.h> |
0032f4e8 | 57 | #include <linux/sched/debug.h> |
450efca7 | 58 | #include <linux/sched/sysctl.h> |
a241ec65 | 59 | |
25c36329 PM |
60 | #include "rcu.h" |
61 | ||
a241ec65 | 62 | MODULE_LICENSE("GPL"); |
e0198b29 | 63 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and Josh Triplett <josh@joshtriplett.org>"); |
a241ec65 | 64 | |
4102adab | 65 | |
2397d072 PM |
66 | /* Bits for ->extendables field, extendables param, and related definitions. */ |
67 | #define RCUTORTURE_RDR_SHIFT 8 /* Put SRCU index in upper bits. */ | |
68 | #define RCUTORTURE_RDR_MASK ((1 << RCUTORTURE_RDR_SHIFT) - 1) | |
69 | #define RCUTORTURE_RDR_BH 0x1 /* Extend readers by disabling bh. */ | |
70 | #define RCUTORTURE_RDR_IRQ 0x2 /* ... disabling interrupts. */ | |
71 | #define RCUTORTURE_RDR_PREEMPT 0x4 /* ... disabling preemption. */ | |
72 | #define RCUTORTURE_RDR_RCU 0x8 /* ... entering another RCU reader. */ | |
bf1bef50 | 73 | #define RCUTORTURE_RDR_NBITS 4 /* Number of bits defined above. */ |
2397d072 PM |
74 | #define RCUTORTURE_MAX_EXTEND (RCUTORTURE_RDR_BH | RCUTORTURE_RDR_IRQ | \ |
75 | RCUTORTURE_RDR_PREEMPT) | |
76 | #define RCUTORTURE_RDR_MAX_LOOPS 0x7 /* Maximum reader extensions. */ | |
77 | /* Must be power of two minus one. */ | |
78 | ||
38706bc5 PM |
79 | torture_param(int, cbflood_inter_holdoff, HZ, |
80 | "Holdoff between floods (jiffies)"); | |
81 | torture_param(int, cbflood_intra_holdoff, 1, | |
82 | "Holdoff between bursts (jiffies)"); | |
83 | torture_param(int, cbflood_n_burst, 3, "# bursts in flood, zero to disable"); | |
84 | torture_param(int, cbflood_n_per_burst, 20000, | |
85 | "# callbacks per burst in flood"); | |
2397d072 PM |
86 | torture_param(int, extendables, RCUTORTURE_MAX_EXTEND, |
87 | "Extend readers by disabling bh (1), irqs (2), or preempt (4)"); | |
9e250225 PM |
88 | torture_param(int, fqs_duration, 0, |
89 | "Duration of fqs bursts (us), 0 to disable"); | |
90 | torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); | |
91 | torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); | |
1b27291b PM |
92 | torture_param(bool, fwd_progress, 1, "Test grace-period forward progress"); |
93 | torture_param(int, fwd_progress_div, 4, "Fraction of CPU stall to wait"); | |
94 | torture_param(int, fwd_progress_holdoff, 60, | |
95 | "Time between forward-progress tests (s)"); | |
96 | torture_param(bool, fwd_progress_need_resched, 1, | |
97 | "Hide cond_resched() behind need_resched()"); | |
a48f3fad | 98 | torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives"); |
9e250225 PM |
99 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); |
100 | torture_param(bool, gp_normal, false, | |
101 | "Use normal (non-expedited) GP wait primitives"); | |
f0bf8fab | 102 | torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives"); |
9e250225 PM |
103 | torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); |
104 | torture_param(int, n_barrier_cbs, 0, | |
105 | "# of callbacks/kthreads for barrier testing"); | |
106 | torture_param(int, nfakewriters, 4, "Number of RCU fake writer threads"); | |
107 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
108 | torture_param(int, object_debug, 0, | |
109 | "Enable debug-object double call_rcu() testing"); | |
110 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
111 | torture_param(int, onoff_interval, 0, | |
028be12b | 112 | "Time between CPU hotplugs (jiffies), 0=disable"); |
9e250225 PM |
113 | torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); |
114 | torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); | |
115 | torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); | |
116 | torture_param(int, stall_cpu_holdoff, 10, | |
117 | "Time to wait before starting stall (s)."); | |
2b1516e5 | 118 | torture_param(int, stall_cpu_irqsoff, 0, "Disable interrupts while stalling."); |
9e250225 PM |
119 | torture_param(int, stat_interval, 60, |
120 | "Number of seconds between stats printk()s"); | |
121 | torture_param(int, stutter, 5, "Number of seconds to run/halt test"); | |
122 | torture_param(int, test_boost, 1, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
123 | torture_param(int, test_boost_duration, 4, | |
124 | "Duration of each boost test, seconds."); | |
125 | torture_param(int, test_boost_interval, 7, | |
126 | "Interval between boost tests, seconds."); | |
127 | torture_param(bool, test_no_idle_hz, true, | |
128 | "Test support for tickless idle CPUs"); | |
90127d60 | 129 | torture_param(int, verbose, 1, |
b5daa8f3 | 130 | "Enable verbose debugging printk()s"); |
9e250225 | 131 | |
d10453e9 | 132 | static char *torture_type = "rcu"; |
d6ad6711 | 133 | module_param(torture_type, charp, 0444); |
d10453e9 | 134 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, ...)"); |
a241ec65 | 135 | |
a241ec65 | 136 | static int nrealreaders; |
38706bc5 | 137 | static int ncbflooders; |
a241ec65 | 138 | static struct task_struct *writer_task; |
b772e1dd | 139 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
140 | static struct task_struct **reader_tasks; |
141 | static struct task_struct *stats_task; | |
38706bc5 | 142 | static struct task_struct **cbflood_task; |
bf66f18e | 143 | static struct task_struct *fqs_task; |
8e8be45e | 144 | static struct task_struct *boost_tasks[NR_CPUS]; |
c13f3757 | 145 | static struct task_struct *stall_task; |
1b27291b | 146 | static struct task_struct *fwd_prog_task; |
fae4b54f PM |
147 | static struct task_struct **barrier_cbs_tasks; |
148 | static struct task_struct *barrier_task; | |
a241ec65 PM |
149 | |
150 | #define RCU_TORTURE_PIPE_LEN 10 | |
151 | ||
152 | struct rcu_torture { | |
153 | struct rcu_head rtort_rcu; | |
154 | int rtort_pipe_count; | |
155 | struct list_head rtort_free; | |
996417d2 | 156 | int rtort_mbtest; |
a241ec65 PM |
157 | }; |
158 | ||
a241ec65 | 159 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 160 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 161 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
162 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
163 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
67522bee PM |
164 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count); |
165 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch); | |
a241ec65 | 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; | |
8da9a595 | 177 | static atomic_long_t n_rcu_torture_timers; |
fae4b54f | 178 | static long n_barrier_attempts; |
bf5b6435 | 179 | static long n_barrier_successes; /* did rcu_barrier test succeed? */ |
38706bc5 | 180 | static atomic_long_t n_cbfloods; |
e3033736 | 181 | static struct list_head rcu_torture_removed; |
d120f65f | 182 | |
ad0dc7f9 PM |
183 | static int rcu_torture_writer_state; |
184 | #define RTWS_FIXED_DELAY 0 | |
185 | #define RTWS_DELAY 1 | |
186 | #define RTWS_REPLACE 2 | |
187 | #define RTWS_DEF_FREE 3 | |
188 | #define RTWS_EXP_SYNC 4 | |
a48f3fad PM |
189 | #define RTWS_COND_GET 5 |
190 | #define RTWS_COND_SYNC 6 | |
f0bf8fab PM |
191 | #define RTWS_SYNC 7 |
192 | #define RTWS_STUTTER 8 | |
193 | #define RTWS_STOPPING 9 | |
18aff33e PM |
194 | static const char * const rcu_torture_writer_state_names[] = { |
195 | "RTWS_FIXED_DELAY", | |
196 | "RTWS_DELAY", | |
197 | "RTWS_REPLACE", | |
198 | "RTWS_DEF_FREE", | |
199 | "RTWS_EXP_SYNC", | |
200 | "RTWS_COND_GET", | |
201 | "RTWS_COND_SYNC", | |
202 | "RTWS_SYNC", | |
203 | "RTWS_STUTTER", | |
204 | "RTWS_STOPPING", | |
205 | }; | |
206 | ||
207 | static const char *rcu_torture_writer_state_getname(void) | |
208 | { | |
209 | unsigned int i = READ_ONCE(rcu_torture_writer_state); | |
210 | ||
211 | if (i >= ARRAY_SIZE(rcu_torture_writer_state_names)) | |
212 | return "???"; | |
213 | return rcu_torture_writer_state_names[i]; | |
214 | } | |
ad0dc7f9 | 215 | |
3acf4a9a | 216 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 217 | #define rcu_can_boost() 1 |
3acf4a9a | 218 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 219 | #define rcu_can_boost() 0 |
3acf4a9a | 220 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 221 | |
e4aa0da3 SR |
222 | #ifdef CONFIG_RCU_TRACE |
223 | static u64 notrace rcu_trace_clock_local(void) | |
224 | { | |
225 | u64 ts = trace_clock_local(); | |
a3b7b6c2 PM |
226 | |
227 | (void)do_div(ts, NSEC_PER_USEC); | |
e4aa0da3 SR |
228 | return ts; |
229 | } | |
230 | #else /* #ifdef CONFIG_RCU_TRACE */ | |
231 | static u64 notrace rcu_trace_clock_local(void) | |
232 | { | |
233 | return 0ULL; | |
234 | } | |
235 | #endif /* #else #ifdef CONFIG_RCU_TRACE */ | |
236 | ||
8e8be45e | 237 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
58ade2db | 238 | static DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ |
8e8be45e | 239 | /* and boost task create/destroy. */ |
fae4b54f | 240 | static atomic_t barrier_cbs_count; /* Barrier callbacks registered. */ |
c6ebcbb6 | 241 | static bool barrier_phase; /* Test phase. */ |
fae4b54f PM |
242 | static atomic_t barrier_cbs_invoked; /* Barrier callbacks invoked. */ |
243 | static wait_queue_head_t *barrier_cbs_wq; /* Coordinate barrier testing. */ | |
244 | static DECLARE_WAIT_QUEUE_HEAD(barrier_wq); | |
8e8be45e | 245 | |
a241ec65 PM |
246 | /* |
247 | * Allocate an element from the rcu_tortures pool. | |
248 | */ | |
97a41e26 | 249 | static struct rcu_torture * |
a241ec65 PM |
250 | rcu_torture_alloc(void) |
251 | { | |
252 | struct list_head *p; | |
253 | ||
adac1665 | 254 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
255 | if (list_empty(&rcu_torture_freelist)) { |
256 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 257 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
258 | return NULL; |
259 | } | |
260 | atomic_inc(&n_rcu_torture_alloc); | |
261 | p = rcu_torture_freelist.next; | |
262 | list_del_init(p); | |
adac1665 | 263 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
264 | return container_of(p, struct rcu_torture, rtort_free); |
265 | } | |
266 | ||
267 | /* | |
268 | * Free an element to the rcu_tortures pool. | |
269 | */ | |
270 | static void | |
271 | rcu_torture_free(struct rcu_torture *p) | |
272 | { | |
273 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 274 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 275 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 276 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
277 | } |
278 | ||
72e9bb54 PM |
279 | /* |
280 | * Operations vector for selecting different types of tests. | |
281 | */ | |
282 | ||
283 | struct rcu_torture_ops { | |
ad0dc7f9 | 284 | int ttype; |
72e9bb54 | 285 | void (*init)(void); |
ca1d51ed | 286 | void (*cleanup)(void); |
72e9bb54 | 287 | int (*readlock)(void); |
51b1130e | 288 | void (*read_delay)(struct torture_random_state *rrsp); |
72e9bb54 | 289 | void (*readunlock)(int idx); |
17ef2fe9 | 290 | unsigned long (*get_gp_seq)(void); |
d7219312 | 291 | unsigned long (*gp_diff)(unsigned long new, unsigned long old); |
0acc512c | 292 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 293 | void (*sync)(void); |
2ec1f2d9 | 294 | void (*exp_sync)(void); |
a48f3fad PM |
295 | unsigned long (*get_state)(void); |
296 | void (*cond_sync)(unsigned long oldstate); | |
db3e8db4 | 297 | call_rcu_func_t call; |
2326974d | 298 | void (*cb_barrier)(void); |
bf66f18e | 299 | void (*fqs)(void); |
eea203fe | 300 | void (*stats)(void); |
1b27291b | 301 | int (*stall_dur)(void); |
0acc512c | 302 | int irq_capable; |
8e8be45e | 303 | int can_boost; |
2397d072 PM |
304 | int extendables; |
305 | int ext_irq_conflict; | |
e66c33d5 | 306 | const char *name; |
72e9bb54 | 307 | }; |
a71fca58 PM |
308 | |
309 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
310 | |
311 | /* | |
312 | * Definitions for rcu torture testing. | |
313 | */ | |
314 | ||
a49a4af7 | 315 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
316 | { |
317 | rcu_read_lock(); | |
318 | return 0; | |
319 | } | |
320 | ||
51b1130e | 321 | static void rcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e | 322 | { |
d0af39e8 PM |
323 | unsigned long started; |
324 | unsigned long completed; | |
b8d57a76 | 325 | const unsigned long shortdelay_us = 200; |
1e696765 | 326 | unsigned long longdelay_ms = 300; |
d0af39e8 | 327 | unsigned long long ts; |
b2896d2e | 328 | |
b8d57a76 JT |
329 | /* We want a short delay sometimes to make a reader delay the grace |
330 | * period, and we want a long delay occasionally to trigger | |
331 | * force_quiescent_state. */ | |
b2896d2e | 332 | |
d0af39e8 | 333 | if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) { |
17ef2fe9 | 334 | started = cur_ops->get_gp_seq(); |
d0af39e8 | 335 | ts = rcu_trace_clock_local(); |
1e696765 PM |
336 | if (preempt_count() & (SOFTIRQ_MASK | HARDIRQ_MASK)) |
337 | longdelay_ms = 5; /* Avoid triggering BH limits. */ | |
b8d57a76 | 338 | mdelay(longdelay_ms); |
17ef2fe9 | 339 | completed = cur_ops->get_gp_seq(); |
d0af39e8 PM |
340 | do_trace_rcu_torture_read(cur_ops->name, NULL, ts, |
341 | started, completed); | |
342 | } | |
51b1130e | 343 | if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) |
b8d57a76 | 344 | udelay(shortdelay_us); |
51b1130e | 345 | if (!preempt_count() && |
e8302739 | 346 | !(torture_random(rrsp) % (nrealreaders * 500))) |
cc1321c9 | 347 | torture_preempt_schedule(); /* QS only if preemptible. */ |
b2896d2e PM |
348 | } |
349 | ||
a49a4af7 | 350 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
351 | { |
352 | rcu_read_unlock(); | |
353 | } | |
354 | ||
a48f3fad PM |
355 | /* |
356 | * Update callback in the pipe. This should be invoked after a grace period. | |
357 | */ | |
358 | static bool | |
359 | rcu_torture_pipe_update_one(struct rcu_torture *rp) | |
360 | { | |
361 | int i; | |
362 | ||
363 | i = rp->rtort_pipe_count; | |
364 | if (i > RCU_TORTURE_PIPE_LEN) | |
365 | i = RCU_TORTURE_PIPE_LEN; | |
366 | atomic_inc(&rcu_torture_wcount[i]); | |
367 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
368 | rp->rtort_mbtest = 0; | |
369 | return true; | |
370 | } | |
371 | return false; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Update all callbacks in the pipe. Suitable for synchronous grace-period | |
376 | * primitives. | |
377 | */ | |
378 | static void | |
379 | rcu_torture_pipe_update(struct rcu_torture *old_rp) | |
380 | { | |
381 | struct rcu_torture *rp; | |
382 | struct rcu_torture *rp1; | |
383 | ||
384 | if (old_rp) | |
385 | list_add(&old_rp->rtort_free, &rcu_torture_removed); | |
386 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
387 | if (rcu_torture_pipe_update_one(rp)) { | |
388 | list_del(&rp->rtort_free); | |
389 | rcu_torture_free(rp); | |
390 | } | |
391 | } | |
392 | } | |
393 | ||
72e9bb54 PM |
394 | static void |
395 | rcu_torture_cb(struct rcu_head *p) | |
396 | { | |
72e9bb54 PM |
397 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); |
398 | ||
36970bb9 | 399 | if (torture_must_stop_irq()) { |
72e9bb54 PM |
400 | /* Test is ending, just drop callbacks on the floor. */ |
401 | /* The next initialization will pick up the pieces. */ | |
402 | return; | |
403 | } | |
a48f3fad | 404 | if (rcu_torture_pipe_update_one(rp)) |
72e9bb54 | 405 | rcu_torture_free(rp); |
a48f3fad | 406 | else |
0acc512c | 407 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
408 | } |
409 | ||
6b80da42 | 410 | static unsigned long rcu_no_completed(void) |
d9a3da06 PM |
411 | { |
412 | return 0; | |
413 | } | |
414 | ||
72e9bb54 PM |
415 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
416 | { | |
417 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
418 | } | |
419 | ||
e3033736 JT |
420 | static void rcu_sync_torture_init(void) |
421 | { | |
422 | INIT_LIST_HEAD(&rcu_torture_removed); | |
423 | } | |
424 | ||
2ec1f2d9 | 425 | static struct rcu_torture_ops rcu_ops = { |
ad0dc7f9 | 426 | .ttype = RCU_FLAVOR, |
0acc512c | 427 | .init = rcu_sync_torture_init, |
0acc512c PM |
428 | .readlock = rcu_torture_read_lock, |
429 | .read_delay = rcu_read_delay, | |
430 | .readunlock = rcu_torture_read_unlock, | |
17ef2fe9 | 431 | .get_gp_seq = rcu_get_gp_seq, |
d7219312 | 432 | .gp_diff = rcu_seq_diff, |
2ec1f2d9 | 433 | .deferred_free = rcu_torture_deferred_free, |
0acc512c | 434 | .sync = synchronize_rcu, |
2ec1f2d9 | 435 | .exp_sync = synchronize_rcu_expedited, |
a48f3fad PM |
436 | .get_state = get_state_synchronize_rcu, |
437 | .cond_sync = cond_synchronize_rcu, | |
2ec1f2d9 PM |
438 | .call = call_rcu, |
439 | .cb_barrier = rcu_barrier, | |
bf66f18e | 440 | .fqs = rcu_force_quiescent_state, |
d9a3da06 | 441 | .stats = NULL, |
1b27291b | 442 | .stall_dur = rcu_jiffies_till_stall_check, |
d9a3da06 | 443 | .irq_capable = 1, |
8e8be45e | 444 | .can_boost = rcu_can_boost(), |
2ec1f2d9 | 445 | .name = "rcu" |
d9a3da06 PM |
446 | }; |
447 | ||
c32e0660 PM |
448 | /* |
449 | * Definitions for rcu_bh torture testing. | |
450 | */ | |
451 | ||
a49a4af7 | 452 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
453 | { |
454 | rcu_read_lock_bh(); | |
455 | return 0; | |
456 | } | |
457 | ||
a49a4af7 | 458 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
459 | { |
460 | rcu_read_unlock_bh(); | |
461 | } | |
462 | ||
c32e0660 PM |
463 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) |
464 | { | |
465 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
466 | } | |
467 | ||
468 | static struct rcu_torture_ops rcu_bh_ops = { | |
ad0dc7f9 | 469 | .ttype = RCU_BH_FLAVOR, |
2ec1f2d9 | 470 | .init = rcu_sync_torture_init, |
0acc512c PM |
471 | .readlock = rcu_bh_torture_read_lock, |
472 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
473 | .readunlock = rcu_bh_torture_read_unlock, | |
17ef2fe9 | 474 | .get_gp_seq = rcu_bh_get_gp_seq, |
d7219312 | 475 | .gp_diff = rcu_seq_diff, |
0acc512c | 476 | .deferred_free = rcu_bh_torture_deferred_free, |
bdf2a436 | 477 | .sync = synchronize_rcu_bh, |
2ec1f2d9 | 478 | .exp_sync = synchronize_rcu_bh_expedited, |
fae4b54f | 479 | .call = call_rcu_bh, |
0acc512c | 480 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 481 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
482 | .stats = NULL, |
483 | .irq_capable = 1, | |
2397d072 PM |
484 | .extendables = (RCUTORTURE_RDR_BH | RCUTORTURE_RDR_IRQ), |
485 | .ext_irq_conflict = RCUTORTURE_RDR_RCU, | |
0acc512c | 486 | .name = "rcu_bh" |
c32e0660 PM |
487 | }; |
488 | ||
ff20e251 PM |
489 | /* |
490 | * Don't even think about trying any of these in real life!!! | |
491 | * The names includes "busted", and they really means it! | |
492 | * The only purpose of these functions is to provide a buggy RCU | |
493 | * implementation to make sure that rcutorture correctly emits | |
494 | * buggy-RCU error messages. | |
495 | */ | |
496 | static void rcu_busted_torture_deferred_free(struct rcu_torture *p) | |
497 | { | |
498 | /* This is a deliberate bug for testing purposes only! */ | |
499 | rcu_torture_cb(&p->rtort_rcu); | |
500 | } | |
501 | ||
502 | static void synchronize_rcu_busted(void) | |
503 | { | |
504 | /* This is a deliberate bug for testing purposes only! */ | |
505 | } | |
506 | ||
507 | static void | |
b6a4ae76 | 508 | call_rcu_busted(struct rcu_head *head, rcu_callback_t func) |
ff20e251 PM |
509 | { |
510 | /* This is a deliberate bug for testing purposes only! */ | |
511 | func(head); | |
512 | } | |
513 | ||
514 | static struct rcu_torture_ops rcu_busted_ops = { | |
ad0dc7f9 | 515 | .ttype = INVALID_RCU_FLAVOR, |
ff20e251 PM |
516 | .init = rcu_sync_torture_init, |
517 | .readlock = rcu_torture_read_lock, | |
518 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
519 | .readunlock = rcu_torture_read_unlock, | |
17ef2fe9 | 520 | .get_gp_seq = rcu_no_completed, |
ff20e251 PM |
521 | .deferred_free = rcu_busted_torture_deferred_free, |
522 | .sync = synchronize_rcu_busted, | |
523 | .exp_sync = synchronize_rcu_busted, | |
524 | .call = call_rcu_busted, | |
525 | .cb_barrier = NULL, | |
526 | .fqs = NULL, | |
527 | .stats = NULL, | |
528 | .irq_capable = 1, | |
b3c98314 | 529 | .name = "busted" |
ff20e251 PM |
530 | }; |
531 | ||
b2896d2e PM |
532 | /* |
533 | * Definitions for srcu torture testing. | |
534 | */ | |
535 | ||
cda4dc81 | 536 | DEFINE_STATIC_SRCU(srcu_ctl); |
ca1d51ed PM |
537 | static struct srcu_struct srcu_ctld; |
538 | static struct srcu_struct *srcu_ctlp = &srcu_ctl; | |
b2896d2e | 539 | |
ca1d51ed | 540 | static int srcu_torture_read_lock(void) __acquires(srcu_ctlp) |
b2896d2e | 541 | { |
ca1d51ed | 542 | return srcu_read_lock(srcu_ctlp); |
b2896d2e PM |
543 | } |
544 | ||
51b1130e | 545 | static void srcu_read_delay(struct torture_random_state *rrsp) |
b2896d2e PM |
546 | { |
547 | long delay; | |
548 | const long uspertick = 1000000 / HZ; | |
549 | const long longdelay = 10; | |
550 | ||
551 | /* We want there to be long-running readers, but not all the time. */ | |
552 | ||
51b1130e PM |
553 | delay = torture_random(rrsp) % |
554 | (nrealreaders * 2 * longdelay * uspertick); | |
5e741fa9 | 555 | if (!delay && in_task()) |
b2896d2e | 556 | schedule_timeout_interruptible(longdelay); |
e546f485 LJ |
557 | else |
558 | rcu_read_delay(rrsp); | |
b2896d2e PM |
559 | } |
560 | ||
ca1d51ed | 561 | static void srcu_torture_read_unlock(int idx) __releases(srcu_ctlp) |
b2896d2e | 562 | { |
ca1d51ed | 563 | srcu_read_unlock(srcu_ctlp, idx); |
b2896d2e PM |
564 | } |
565 | ||
6b80da42 | 566 | static unsigned long srcu_torture_completed(void) |
b2896d2e | 567 | { |
ca1d51ed | 568 | return srcu_batches_completed(srcu_ctlp); |
b2896d2e PM |
569 | } |
570 | ||
9059c940 LJ |
571 | static void srcu_torture_deferred_free(struct rcu_torture *rp) |
572 | { | |
ca1d51ed | 573 | call_srcu(srcu_ctlp, &rp->rtort_rcu, rcu_torture_cb); |
9059c940 LJ |
574 | } |
575 | ||
b772e1dd JT |
576 | static void srcu_torture_synchronize(void) |
577 | { | |
ca1d51ed | 578 | synchronize_srcu(srcu_ctlp); |
b772e1dd JT |
579 | } |
580 | ||
e3f8d378 | 581 | static void srcu_torture_call(struct rcu_head *head, |
b6a4ae76 | 582 | rcu_callback_t func) |
e3f8d378 | 583 | { |
ca1d51ed | 584 | call_srcu(srcu_ctlp, head, func); |
e3f8d378 PM |
585 | } |
586 | ||
587 | static void srcu_torture_barrier(void) | |
588 | { | |
ca1d51ed | 589 | srcu_barrier(srcu_ctlp); |
e3f8d378 PM |
590 | } |
591 | ||
eea203fe | 592 | static void srcu_torture_stats(void) |
b2896d2e | 593 | { |
115a1a52 | 594 | srcu_torture_stats_print(srcu_ctlp, torture_type, TORTURE_FLAG); |
b2896d2e PM |
595 | } |
596 | ||
2ec1f2d9 PM |
597 | static void srcu_torture_synchronize_expedited(void) |
598 | { | |
ca1d51ed | 599 | synchronize_srcu_expedited(srcu_ctlp); |
2ec1f2d9 PM |
600 | } |
601 | ||
b2896d2e | 602 | static struct rcu_torture_ops srcu_ops = { |
ad0dc7f9 | 603 | .ttype = SRCU_FLAVOR, |
cda4dc81 | 604 | .init = rcu_sync_torture_init, |
0acc512c PM |
605 | .readlock = srcu_torture_read_lock, |
606 | .read_delay = srcu_read_delay, | |
607 | .readunlock = srcu_torture_read_unlock, | |
17ef2fe9 | 608 | .get_gp_seq = srcu_torture_completed, |
9059c940 | 609 | .deferred_free = srcu_torture_deferred_free, |
0acc512c | 610 | .sync = srcu_torture_synchronize, |
2ec1f2d9 | 611 | .exp_sync = srcu_torture_synchronize_expedited, |
e3f8d378 PM |
612 | .call = srcu_torture_call, |
613 | .cb_barrier = srcu_torture_barrier, | |
0acc512c | 614 | .stats = srcu_torture_stats, |
5e741fa9 | 615 | .irq_capable = 1, |
0acc512c | 616 | .name = "srcu" |
b2896d2e PM |
617 | }; |
618 | ||
ca1d51ed PM |
619 | static void srcu_torture_init(void) |
620 | { | |
621 | rcu_sync_torture_init(); | |
622 | WARN_ON(init_srcu_struct(&srcu_ctld)); | |
623 | srcu_ctlp = &srcu_ctld; | |
624 | } | |
625 | ||
626 | static void srcu_torture_cleanup(void) | |
627 | { | |
f7194ac3 PM |
628 | static DEFINE_TORTURE_RANDOM(rand); |
629 | ||
630 | if (torture_random(&rand) & 0x800) | |
631 | cleanup_srcu_struct(&srcu_ctld); | |
632 | else | |
633 | cleanup_srcu_struct_quiesced(&srcu_ctld); | |
ca1d51ed PM |
634 | srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */ |
635 | } | |
636 | ||
637 | /* As above, but dynamically allocated. */ | |
638 | static struct rcu_torture_ops srcud_ops = { | |
639 | .ttype = SRCU_FLAVOR, | |
640 | .init = srcu_torture_init, | |
641 | .cleanup = srcu_torture_cleanup, | |
642 | .readlock = srcu_torture_read_lock, | |
643 | .read_delay = srcu_read_delay, | |
644 | .readunlock = srcu_torture_read_unlock, | |
17ef2fe9 | 645 | .get_gp_seq = srcu_torture_completed, |
ca1d51ed PM |
646 | .deferred_free = srcu_torture_deferred_free, |
647 | .sync = srcu_torture_synchronize, | |
648 | .exp_sync = srcu_torture_synchronize_expedited, | |
649 | .call = srcu_torture_call, | |
650 | .cb_barrier = srcu_torture_barrier, | |
651 | .stats = srcu_torture_stats, | |
5e741fa9 | 652 | .irq_capable = 1, |
ca1d51ed PM |
653 | .name = "srcud" |
654 | }; | |
655 | ||
2397d072 PM |
656 | /* As above, but broken due to inappropriate reader extension. */ |
657 | static struct rcu_torture_ops busted_srcud_ops = { | |
658 | .ttype = SRCU_FLAVOR, | |
659 | .init = srcu_torture_init, | |
660 | .cleanup = srcu_torture_cleanup, | |
661 | .readlock = srcu_torture_read_lock, | |
662 | .read_delay = rcu_read_delay, | |
663 | .readunlock = srcu_torture_read_unlock, | |
664 | .get_gp_seq = srcu_torture_completed, | |
665 | .deferred_free = srcu_torture_deferred_free, | |
666 | .sync = srcu_torture_synchronize, | |
667 | .exp_sync = srcu_torture_synchronize_expedited, | |
668 | .call = srcu_torture_call, | |
669 | .cb_barrier = srcu_torture_barrier, | |
670 | .stats = srcu_torture_stats, | |
671 | .irq_capable = 1, | |
672 | .extendables = RCUTORTURE_MAX_EXTEND, | |
673 | .name = "busted_srcud" | |
674 | }; | |
675 | ||
4b6c2cca JT |
676 | /* |
677 | * Definitions for sched torture testing. | |
678 | */ | |
679 | ||
680 | static int sched_torture_read_lock(void) | |
681 | { | |
682 | preempt_disable(); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | static void sched_torture_read_unlock(int idx) | |
687 | { | |
688 | preempt_enable(); | |
689 | } | |
690 | ||
2326974d PM |
691 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
692 | { | |
693 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
694 | } | |
695 | ||
4b6c2cca | 696 | static struct rcu_torture_ops sched_ops = { |
ad0dc7f9 | 697 | .ttype = RCU_SCHED_FLAVOR, |
0acc512c | 698 | .init = rcu_sync_torture_init, |
0acc512c PM |
699 | .readlock = sched_torture_read_lock, |
700 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
701 | .readunlock = sched_torture_read_unlock, | |
17ef2fe9 | 702 | .get_gp_seq = rcu_sched_get_gp_seq, |
d7219312 | 703 | .gp_diff = rcu_seq_diff, |
0acc512c | 704 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 705 | .sync = synchronize_sched, |
2ec1f2d9 | 706 | .exp_sync = synchronize_sched_expedited, |
24560056 PM |
707 | .get_state = get_state_synchronize_sched, |
708 | .cond_sync = cond_synchronize_sched, | |
2ec1f2d9 | 709 | .call = call_rcu_sched, |
0acc512c | 710 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 711 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
712 | .stats = NULL, |
713 | .irq_capable = 1, | |
2397d072 | 714 | .extendables = RCUTORTURE_MAX_EXTEND, |
0acc512c | 715 | .name = "sched" |
4b6c2cca JT |
716 | }; |
717 | ||
69c60455 PM |
718 | /* |
719 | * Definitions for RCU-tasks torture testing. | |
720 | */ | |
721 | ||
722 | static int tasks_torture_read_lock(void) | |
723 | { | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static void tasks_torture_read_unlock(int idx) | |
728 | { | |
729 | } | |
730 | ||
731 | static void rcu_tasks_torture_deferred_free(struct rcu_torture *p) | |
732 | { | |
733 | call_rcu_tasks(&p->rtort_rcu, rcu_torture_cb); | |
734 | } | |
735 | ||
736 | static struct rcu_torture_ops tasks_ops = { | |
737 | .ttype = RCU_TASKS_FLAVOR, | |
738 | .init = rcu_sync_torture_init, | |
739 | .readlock = tasks_torture_read_lock, | |
740 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
741 | .readunlock = tasks_torture_read_unlock, | |
17ef2fe9 | 742 | .get_gp_seq = rcu_no_completed, |
69c60455 PM |
743 | .deferred_free = rcu_tasks_torture_deferred_free, |
744 | .sync = synchronize_rcu_tasks, | |
745 | .exp_sync = synchronize_rcu_tasks, | |
746 | .call = call_rcu_tasks, | |
747 | .cb_barrier = rcu_barrier_tasks, | |
748 | .fqs = NULL, | |
749 | .stats = NULL, | |
750 | .irq_capable = 1, | |
751 | .name = "tasks" | |
752 | }; | |
753 | ||
d7219312 PM |
754 | static unsigned long rcutorture_seq_diff(unsigned long new, unsigned long old) |
755 | { | |
756 | if (!cur_ops->gp_diff) | |
757 | return new - old; | |
758 | return cur_ops->gp_diff(new, old); | |
759 | } | |
760 | ||
5be5d1a1 PM |
761 | static bool __maybe_unused torturing_tasks(void) |
762 | { | |
763 | return cur_ops == &tasks_ops; | |
764 | } | |
765 | ||
8e8be45e PM |
766 | /* |
767 | * RCU torture priority-boost testing. Runs one real-time thread per | |
768 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
769 | * spinning waiting for them to be invoked. If a given callback takes | |
770 | * too long to be invoked, we assume that priority inversion has occurred. | |
771 | */ | |
772 | ||
773 | struct rcu_boost_inflight { | |
774 | struct rcu_head rcu; | |
775 | int inflight; | |
776 | }; | |
777 | ||
778 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
779 | { | |
780 | struct rcu_boost_inflight *rbip = | |
781 | container_of(head, struct rcu_boost_inflight, rcu); | |
782 | ||
6c7ed42c PM |
783 | /* Ensure RCU-core accesses precede clearing ->inflight */ |
784 | smp_store_release(&rbip->inflight, 0); | |
8e8be45e PM |
785 | } |
786 | ||
450efca7 JFG |
787 | static int old_rt_runtime = -1; |
788 | ||
789 | static void rcu_torture_disable_rt_throttle(void) | |
790 | { | |
791 | /* | |
792 | * Disable RT throttling so that rcutorture's boost threads don't get | |
793 | * throttled. Only possible if rcutorture is built-in otherwise the | |
794 | * user should manually do this by setting the sched_rt_period_us and | |
795 | * sched_rt_runtime sysctls. | |
796 | */ | |
797 | if (!IS_BUILTIN(CONFIG_RCU_TORTURE_TEST) || old_rt_runtime != -1) | |
798 | return; | |
799 | ||
800 | old_rt_runtime = sysctl_sched_rt_runtime; | |
801 | sysctl_sched_rt_runtime = -1; | |
802 | } | |
803 | ||
804 | static void rcu_torture_enable_rt_throttle(void) | |
805 | { | |
806 | if (!IS_BUILTIN(CONFIG_RCU_TORTURE_TEST) || old_rt_runtime == -1) | |
807 | return; | |
808 | ||
809 | sysctl_sched_rt_runtime = old_rt_runtime; | |
810 | old_rt_runtime = -1; | |
811 | } | |
812 | ||
3b745c89 JFG |
813 | static bool rcu_torture_boost_failed(unsigned long start, unsigned long end) |
814 | { | |
815 | if (end - start > test_boost_duration * HZ - HZ / 2) { | |
816 | VERBOSE_TOROUT_STRING("rcu_torture_boost boosting failed"); | |
817 | n_rcu_torture_boost_failure++; | |
818 | ||
819 | return true; /* failed */ | |
820 | } | |
821 | ||
822 | return false; /* passed */ | |
823 | } | |
824 | ||
8e8be45e PM |
825 | static int rcu_torture_boost(void *arg) |
826 | { | |
827 | unsigned long call_rcu_time; | |
828 | unsigned long endtime; | |
829 | unsigned long oldstarttime; | |
830 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
831 | struct sched_param sp; | |
832 | ||
5ccf60f2 | 833 | VERBOSE_TOROUT_STRING("rcu_torture_boost started"); |
8e8be45e PM |
834 | |
835 | /* Set real-time priority. */ | |
836 | sp.sched_priority = 1; | |
837 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
5ccf60f2 | 838 | VERBOSE_TOROUT_STRING("rcu_torture_boost RT prio failed!"); |
8e8be45e PM |
839 | n_rcu_torture_boost_rterror++; |
840 | } | |
841 | ||
561190e3 | 842 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
843 | /* Each pass through the following loop does one boost-test cycle. */ |
844 | do { | |
3b745c89 JFG |
845 | /* Track if the test failed already in this test interval? */ |
846 | bool failed = false; | |
847 | ||
848 | /* Increment n_rcu_torture_boosts once per boost-test */ | |
849 | while (!kthread_should_stop()) { | |
850 | if (mutex_trylock(&boost_mutex)) { | |
851 | n_rcu_torture_boosts++; | |
852 | mutex_unlock(&boost_mutex); | |
853 | break; | |
854 | } | |
855 | schedule_timeout_uninterruptible(1); | |
856 | } | |
857 | if (kthread_should_stop()) | |
858 | goto checkwait; | |
859 | ||
8e8be45e PM |
860 | /* Wait for the next test interval. */ |
861 | oldstarttime = boost_starttime; | |
93898fb1 | 862 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
0e11c8e8 | 863 | schedule_timeout_interruptible(oldstarttime - jiffies); |
628edaa5 | 864 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 865 | if (torture_must_stop()) |
8e8be45e PM |
866 | goto checkwait; |
867 | } | |
868 | ||
869 | /* Do one boost-test interval. */ | |
870 | endtime = oldstarttime + test_boost_duration * HZ; | |
871 | call_rcu_time = jiffies; | |
93898fb1 | 872 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e | 873 | /* If we don't have a callback in flight, post one. */ |
6c7ed42c PM |
874 | if (!smp_load_acquire(&rbi.inflight)) { |
875 | /* RCU core before ->inflight = 1. */ | |
876 | smp_store_release(&rbi.inflight, 1); | |
8e8be45e | 877 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); |
3b745c89 JFG |
878 | /* Check if the boost test failed */ |
879 | failed = failed || | |
880 | rcu_torture_boost_failed(call_rcu_time, | |
881 | jiffies); | |
8e8be45e PM |
882 | call_rcu_time = jiffies; |
883 | } | |
628edaa5 | 884 | stutter_wait("rcu_torture_boost"); |
36970bb9 | 885 | if (torture_must_stop()) |
8e8be45e PM |
886 | goto checkwait; |
887 | } | |
888 | ||
3b745c89 JFG |
889 | /* |
890 | * If boost never happened, then inflight will always be 1, in | |
891 | * this case the boost check would never happen in the above | |
892 | * loop so do another one here. | |
893 | */ | |
894 | if (!failed && smp_load_acquire(&rbi.inflight)) | |
895 | rcu_torture_boost_failed(call_rcu_time, jiffies); | |
896 | ||
8e8be45e PM |
897 | /* |
898 | * Set the start time of the next test interval. | |
899 | * Yes, this is vulnerable to long delays, but such | |
900 | * delays simply cause a false negative for the next | |
901 | * interval. Besides, we are running at RT priority, | |
902 | * so delays should be relatively rare. | |
903 | */ | |
ab8f11e5 PM |
904 | while (oldstarttime == boost_starttime && |
905 | !kthread_should_stop()) { | |
8e8be45e PM |
906 | if (mutex_trylock(&boost_mutex)) { |
907 | boost_starttime = jiffies + | |
908 | test_boost_interval * HZ; | |
8e8be45e PM |
909 | mutex_unlock(&boost_mutex); |
910 | break; | |
911 | } | |
912 | schedule_timeout_uninterruptible(1); | |
913 | } | |
914 | ||
915 | /* Go do the stutter. */ | |
628edaa5 | 916 | checkwait: stutter_wait("rcu_torture_boost"); |
36970bb9 | 917 | } while (!torture_must_stop()); |
8e8be45e PM |
918 | |
919 | /* Clean up and exit. */ | |
6c7ed42c | 920 | while (!kthread_should_stop() || smp_load_acquire(&rbi.inflight)) { |
7fafaac5 | 921 | torture_shutdown_absorb("rcu_torture_boost"); |
8e8be45e | 922 | schedule_timeout_uninterruptible(1); |
7fafaac5 | 923 | } |
9d68197c | 924 | destroy_rcu_head_on_stack(&rbi.rcu); |
7fafaac5 | 925 | torture_kthread_stopping("rcu_torture_boost"); |
8e8be45e PM |
926 | return 0; |
927 | } | |
928 | ||
38706bc5 PM |
929 | static void rcu_torture_cbflood_cb(struct rcu_head *rhp) |
930 | { | |
931 | } | |
932 | ||
933 | /* | |
934 | * RCU torture callback-flood kthread. Repeatedly induces bursts of calls | |
935 | * to call_rcu() or analogous, increasing the probability of occurrence | |
936 | * of callback-overflow corner cases. | |
937 | */ | |
938 | static int | |
939 | rcu_torture_cbflood(void *arg) | |
940 | { | |
941 | int err = 1; | |
942 | int i; | |
943 | int j; | |
944 | struct rcu_head *rhp; | |
945 | ||
946 | if (cbflood_n_per_burst > 0 && | |
947 | cbflood_inter_holdoff > 0 && | |
948 | cbflood_intra_holdoff > 0 && | |
949 | cur_ops->call && | |
950 | cur_ops->cb_barrier) { | |
42bc47b3 KC |
951 | rhp = vmalloc(array3_size(cbflood_n_burst, |
952 | cbflood_n_per_burst, | |
953 | sizeof(*rhp))); | |
38706bc5 PM |
954 | err = !rhp; |
955 | } | |
956 | if (err) { | |
957 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood disabled: Bad args or OOM"); | |
3a0af333 | 958 | goto wait_for_stop; |
38706bc5 PM |
959 | } |
960 | VERBOSE_TOROUT_STRING("rcu_torture_cbflood task started"); | |
961 | do { | |
962 | schedule_timeout_interruptible(cbflood_inter_holdoff); | |
963 | atomic_long_inc(&n_cbfloods); | |
964 | WARN_ON(signal_pending(current)); | |
965 | for (i = 0; i < cbflood_n_burst; i++) { | |
966 | for (j = 0; j < cbflood_n_per_burst; j++) { | |
967 | cur_ops->call(&rhp[i * cbflood_n_per_burst + j], | |
968 | rcu_torture_cbflood_cb); | |
969 | } | |
970 | schedule_timeout_interruptible(cbflood_intra_holdoff); | |
971 | WARN_ON(signal_pending(current)); | |
972 | } | |
973 | cur_ops->cb_barrier(); | |
974 | stutter_wait("rcu_torture_cbflood"); | |
975 | } while (!torture_must_stop()); | |
b8969d1a | 976 | vfree(rhp); |
3a0af333 | 977 | wait_for_stop: |
38706bc5 PM |
978 | torture_kthread_stopping("rcu_torture_cbflood"); |
979 | return 0; | |
980 | } | |
981 | ||
bf66f18e PM |
982 | /* |
983 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
984 | * bursts of calls to force_quiescent_state(), increasing the probability | |
985 | * of occurrence of some important types of race conditions. | |
986 | */ | |
987 | static int | |
988 | rcu_torture_fqs(void *arg) | |
989 | { | |
990 | unsigned long fqs_resume_time; | |
991 | int fqs_burst_remaining; | |
992 | ||
5ccf60f2 | 993 | VERBOSE_TOROUT_STRING("rcu_torture_fqs task started"); |
bf66f18e PM |
994 | do { |
995 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
996 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
997 | !kthread_should_stop()) { | |
bf66f18e PM |
998 | schedule_timeout_interruptible(1); |
999 | } | |
1000 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
1001 | while (fqs_burst_remaining > 0 && |
1002 | !kthread_should_stop()) { | |
bf66f18e PM |
1003 | cur_ops->fqs(); |
1004 | udelay(fqs_holdoff); | |
1005 | fqs_burst_remaining -= fqs_holdoff; | |
1006 | } | |
628edaa5 | 1007 | stutter_wait("rcu_torture_fqs"); |
36970bb9 | 1008 | } while (!torture_must_stop()); |
7fafaac5 | 1009 | torture_kthread_stopping("rcu_torture_fqs"); |
bf66f18e PM |
1010 | return 0; |
1011 | } | |
1012 | ||
a241ec65 PM |
1013 | /* |
1014 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
1015 | * for that pointed to by rcu_torture_current, freeing the old structure | |
1016 | * after a series of grace periods (the "pipeline"). | |
1017 | */ | |
1018 | static int | |
1019 | rcu_torture_writer(void *arg) | |
1020 | { | |
9efafb88 | 1021 | bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal(); |
4bb3c5f4 | 1022 | int expediting = 0; |
a48f3fad PM |
1023 | unsigned long gp_snap; |
1024 | bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; | |
f0bf8fab | 1025 | bool gp_sync1 = gp_sync; |
a241ec65 | 1026 | int i; |
a241ec65 PM |
1027 | struct rcu_torture *rp; |
1028 | struct rcu_torture *old_rp; | |
51b1130e | 1029 | static DEFINE_TORTURE_RANDOM(rand); |
f0bf8fab PM |
1030 | int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, |
1031 | RTWS_COND_GET, RTWS_SYNC }; | |
a48f3fad | 1032 | int nsynctypes = 0; |
a241ec65 | 1033 | |
5ccf60f2 | 1034 | VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); |
f7c0e6ad | 1035 | if (!can_expedite) |
aa5a8988 | 1036 | pr_alert("%s" TORTURE_FLAG |
f7c0e6ad | 1037 | " GP expediting controlled from boot/sysfs for %s.\n", |
aa5a8988 | 1038 | torture_type, cur_ops->name); |
dbdf65b1 | 1039 | |
a48f3fad | 1040 | /* Initialize synctype[] array. If none set, take default. */ |
c136f991 | 1041 | if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync1) |
f0bf8fab | 1042 | gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; |
db0c1a8a | 1043 | if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) { |
a48f3fad | 1044 | synctype[nsynctypes++] = RTWS_COND_GET; |
db0c1a8a PM |
1045 | pr_info("%s: Testing conditional GPs.\n", __func__); |
1046 | } else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) { | |
e0d31a34 | 1047 | pr_alert("%s: gp_cond without primitives.\n", __func__); |
db0c1a8a PM |
1048 | } |
1049 | if (gp_exp1 && cur_ops->exp_sync) { | |
a48f3fad | 1050 | synctype[nsynctypes++] = RTWS_EXP_SYNC; |
db0c1a8a PM |
1051 | pr_info("%s: Testing expedited GPs.\n", __func__); |
1052 | } else if (gp_exp && !cur_ops->exp_sync) { | |
e0d31a34 | 1053 | pr_alert("%s: gp_exp without primitives.\n", __func__); |
db0c1a8a PM |
1054 | } |
1055 | if (gp_normal1 && cur_ops->deferred_free) { | |
a48f3fad | 1056 | synctype[nsynctypes++] = RTWS_DEF_FREE; |
db0c1a8a PM |
1057 | pr_info("%s: Testing asynchronous GPs.\n", __func__); |
1058 | } else if (gp_normal && !cur_ops->deferred_free) { | |
e0d31a34 | 1059 | pr_alert("%s: gp_normal without primitives.\n", __func__); |
db0c1a8a PM |
1060 | } |
1061 | if (gp_sync1 && cur_ops->sync) { | |
f0bf8fab | 1062 | synctype[nsynctypes++] = RTWS_SYNC; |
db0c1a8a PM |
1063 | pr_info("%s: Testing normal GPs.\n", __func__); |
1064 | } else if (gp_sync && !cur_ops->sync) { | |
e0d31a34 | 1065 | pr_alert("%s: gp_sync without primitives.\n", __func__); |
db0c1a8a | 1066 | } |
a48f3fad PM |
1067 | if (WARN_ONCE(nsynctypes == 0, |
1068 | "rcu_torture_writer: No update-side primitives.\n")) { | |
f0bf8fab PM |
1069 | /* |
1070 | * No updates primitives, so don't try updating. | |
1071 | * The resulting test won't be testing much, hence the | |
1072 | * above WARN_ONCE(). | |
1073 | */ | |
a48f3fad PM |
1074 | rcu_torture_writer_state = RTWS_STOPPING; |
1075 | torture_kthread_stopping("rcu_torture_writer"); | |
1076 | } | |
1077 | ||
a241ec65 | 1078 | do { |
ad0dc7f9 | 1079 | rcu_torture_writer_state = RTWS_FIXED_DELAY; |
a241ec65 | 1080 | schedule_timeout_uninterruptible(1); |
a71fca58 PM |
1081 | rp = rcu_torture_alloc(); |
1082 | if (rp == NULL) | |
a241ec65 PM |
1083 | continue; |
1084 | rp->rtort_pipe_count = 0; | |
ad0dc7f9 | 1085 | rcu_torture_writer_state = RTWS_DELAY; |
51b1130e | 1086 | udelay(torture_random(&rand) & 0x3ff); |
ad0dc7f9 | 1087 | rcu_torture_writer_state = RTWS_REPLACE; |
0ddea0ea PM |
1088 | old_rp = rcu_dereference_check(rcu_torture_current, |
1089 | current == writer_task); | |
996417d2 | 1090 | rp->rtort_mbtest = 1; |
a241ec65 | 1091 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 1092 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 1093 | if (old_rp) { |
a241ec65 PM |
1094 | i = old_rp->rtort_pipe_count; |
1095 | if (i > RCU_TORTURE_PIPE_LEN) | |
1096 | i = RCU_TORTURE_PIPE_LEN; | |
1097 | atomic_inc(&rcu_torture_wcount[i]); | |
1098 | old_rp->rtort_pipe_count++; | |
a48f3fad PM |
1099 | switch (synctype[torture_random(&rand) % nsynctypes]) { |
1100 | case RTWS_DEF_FREE: | |
ad0dc7f9 | 1101 | rcu_torture_writer_state = RTWS_DEF_FREE; |
2ec1f2d9 | 1102 | cur_ops->deferred_free(old_rp); |
a48f3fad PM |
1103 | break; |
1104 | case RTWS_EXP_SYNC: | |
ad0dc7f9 | 1105 | rcu_torture_writer_state = RTWS_EXP_SYNC; |
2ec1f2d9 | 1106 | cur_ops->exp_sync(); |
a48f3fad PM |
1107 | rcu_torture_pipe_update(old_rp); |
1108 | break; | |
1109 | case RTWS_COND_GET: | |
1110 | rcu_torture_writer_state = RTWS_COND_GET; | |
1111 | gp_snap = cur_ops->get_state(); | |
1112 | i = torture_random(&rand) % 16; | |
1113 | if (i != 0) | |
1114 | schedule_timeout_interruptible(i); | |
1115 | udelay(torture_random(&rand) % 1000); | |
1116 | rcu_torture_writer_state = RTWS_COND_SYNC; | |
1117 | cur_ops->cond_sync(gp_snap); | |
1118 | rcu_torture_pipe_update(old_rp); | |
1119 | break; | |
f0bf8fab PM |
1120 | case RTWS_SYNC: |
1121 | rcu_torture_writer_state = RTWS_SYNC; | |
1122 | cur_ops->sync(); | |
1123 | rcu_torture_pipe_update(old_rp); | |
1124 | break; | |
a48f3fad PM |
1125 | default: |
1126 | WARN_ON_ONCE(1); | |
1127 | break; | |
2ec1f2d9 | 1128 | } |
a241ec65 | 1129 | } |
1b27291b PM |
1130 | WRITE_ONCE(rcu_torture_current_version, |
1131 | rcu_torture_current_version + 1); | |
4bb3c5f4 PM |
1132 | /* Cycle through nesting levels of rcu_expedite_gp() calls. */ |
1133 | if (can_expedite && | |
1134 | !(torture_random(&rand) & 0xff & (!!expediting - 1))) { | |
1135 | WARN_ON_ONCE(expediting == 0 && rcu_gp_is_expedited()); | |
1136 | if (expediting >= 0) | |
1137 | rcu_expedite_gp(); | |
1138 | else | |
1139 | rcu_unexpedite_gp(); | |
1140 | if (++expediting > 3) | |
1141 | expediting = -expediting; | |
f7c0e6ad PM |
1142 | } else if (!can_expedite) { /* Disabled during boot, recheck. */ |
1143 | can_expedite = !rcu_gp_is_expedited() && | |
1144 | !rcu_gp_is_normal(); | |
4bb3c5f4 | 1145 | } |
ad0dc7f9 | 1146 | rcu_torture_writer_state = RTWS_STUTTER; |
628edaa5 | 1147 | stutter_wait("rcu_torture_writer"); |
36970bb9 | 1148 | } while (!torture_must_stop()); |
4bb3c5f4 PM |
1149 | /* Reset expediting back to unexpedited. */ |
1150 | if (expediting > 0) | |
1151 | expediting = -expediting; | |
1152 | while (can_expedite && expediting++ < 0) | |
1153 | rcu_unexpedite_gp(); | |
1154 | WARN_ON_ONCE(can_expedite && rcu_gp_is_expedited()); | |
f7c0e6ad PM |
1155 | if (!can_expedite) |
1156 | pr_alert("%s" TORTURE_FLAG | |
1157 | " Dynamic grace-period expediting was disabled.\n", | |
1158 | torture_type); | |
ad0dc7f9 | 1159 | rcu_torture_writer_state = RTWS_STOPPING; |
7fafaac5 | 1160 | torture_kthread_stopping("rcu_torture_writer"); |
a241ec65 PM |
1161 | return 0; |
1162 | } | |
1163 | ||
b772e1dd JT |
1164 | /* |
1165 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
1166 | * delay between calls. | |
1167 | */ | |
1168 | static int | |
1169 | rcu_torture_fakewriter(void *arg) | |
1170 | { | |
51b1130e | 1171 | DEFINE_TORTURE_RANDOM(rand); |
b772e1dd | 1172 | |
5ccf60f2 | 1173 | VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started"); |
d277d868 | 1174 | set_user_nice(current, MAX_NICE); |
b772e1dd JT |
1175 | |
1176 | do { | |
51b1130e PM |
1177 | schedule_timeout_uninterruptible(1 + torture_random(&rand)%10); |
1178 | udelay(torture_random(&rand) & 0x3ff); | |
72472a02 | 1179 | if (cur_ops->cb_barrier != NULL && |
51b1130e | 1180 | torture_random(&rand) % (nfakewriters * 8) == 0) { |
72472a02 | 1181 | cur_ops->cb_barrier(); |
2ec1f2d9 | 1182 | } else if (gp_normal == gp_exp) { |
eb033993 | 1183 | if (cur_ops->sync && torture_random(&rand) & 0x80) |
2ec1f2d9 | 1184 | cur_ops->sync(); |
eb033993 | 1185 | else if (cur_ops->exp_sync) |
2ec1f2d9 | 1186 | cur_ops->exp_sync(); |
eb033993 | 1187 | } else if (gp_normal && cur_ops->sync) { |
72472a02 | 1188 | cur_ops->sync(); |
eb033993 | 1189 | } else if (cur_ops->exp_sync) { |
2ec1f2d9 PM |
1190 | cur_ops->exp_sync(); |
1191 | } | |
628edaa5 | 1192 | stutter_wait("rcu_torture_fakewriter"); |
36970bb9 | 1193 | } while (!torture_must_stop()); |
b772e1dd | 1194 | |
7fafaac5 | 1195 | torture_kthread_stopping("rcu_torture_fakewriter"); |
b772e1dd JT |
1196 | return 0; |
1197 | } | |
1198 | ||
f34c8585 PM |
1199 | static void rcu_torture_timer_cb(struct rcu_head *rhp) |
1200 | { | |
1201 | kfree(rhp); | |
1202 | } | |
1203 | ||
0729fbf3 | 1204 | /* |
2397d072 PM |
1205 | * Do one extension of an RCU read-side critical section using the |
1206 | * current reader state in readstate (set to zero for initial entry | |
1207 | * to extended critical section), set the new state as specified by | |
1208 | * newstate (set to zero for final exit from extended critical section), | |
1209 | * and random-number-generator state in trsp. If this is neither the | |
1210 | * beginning or end of the critical section and if there was actually a | |
1211 | * change, do a ->read_delay(). | |
0729fbf3 | 1212 | */ |
2397d072 PM |
1213 | static void rcutorture_one_extend(int *readstate, int newstate, |
1214 | struct torture_random_state *trsp) | |
1215 | { | |
1216 | int idxnew = -1; | |
1217 | int idxold = *readstate; | |
1218 | int statesnew = ~*readstate & newstate; | |
1219 | int statesold = *readstate & ~newstate; | |
1220 | ||
1221 | WARN_ON_ONCE(idxold < 0); | |
1222 | WARN_ON_ONCE((idxold >> RCUTORTURE_RDR_SHIFT) > 1); | |
1223 | ||
1224 | /* First, put new protection in place to avoid critical-section gap. */ | |
1225 | if (statesnew & RCUTORTURE_RDR_BH) | |
1226 | local_bh_disable(); | |
1227 | if (statesnew & RCUTORTURE_RDR_IRQ) | |
1228 | local_irq_disable(); | |
1229 | if (statesnew & RCUTORTURE_RDR_PREEMPT) | |
1230 | preempt_disable(); | |
1231 | if (statesnew & RCUTORTURE_RDR_RCU) | |
1232 | idxnew = cur_ops->readlock() << RCUTORTURE_RDR_SHIFT; | |
1233 | ||
1234 | /* Next, remove old protection, irq first due to bh conflict. */ | |
1235 | if (statesold & RCUTORTURE_RDR_IRQ) | |
1236 | local_irq_enable(); | |
1237 | if (statesold & RCUTORTURE_RDR_BH) | |
1238 | local_bh_enable(); | |
1239 | if (statesold & RCUTORTURE_RDR_PREEMPT) | |
1240 | preempt_enable(); | |
1241 | if (statesold & RCUTORTURE_RDR_RCU) | |
1242 | cur_ops->readunlock(idxold >> RCUTORTURE_RDR_SHIFT); | |
1243 | ||
1244 | /* Delay if neither beginning nor end and there was a change. */ | |
1245 | if ((statesnew || statesold) && *readstate && newstate) | |
1246 | cur_ops->read_delay(trsp); | |
1247 | ||
1248 | /* Update the reader state. */ | |
1249 | if (idxnew == -1) | |
1250 | idxnew = idxold & ~RCUTORTURE_RDR_MASK; | |
1251 | WARN_ON_ONCE(idxnew < 0); | |
1252 | WARN_ON_ONCE((idxnew >> RCUTORTURE_RDR_SHIFT) > 1); | |
1253 | *readstate = idxnew | newstate; | |
1254 | WARN_ON_ONCE((*readstate >> RCUTORTURE_RDR_SHIFT) < 0); | |
1255 | WARN_ON_ONCE((*readstate >> RCUTORTURE_RDR_SHIFT) > 1); | |
1256 | } | |
1257 | ||
1258 | /* Return the biggest extendables mask given current RCU and boot parameters. */ | |
1259 | static int rcutorture_extend_mask_max(void) | |
1260 | { | |
1261 | int mask; | |
1262 | ||
1263 | WARN_ON_ONCE(extendables & ~RCUTORTURE_MAX_EXTEND); | |
1264 | mask = extendables & RCUTORTURE_MAX_EXTEND & cur_ops->extendables; | |
1265 | mask = mask | RCUTORTURE_RDR_RCU; | |
1266 | return mask; | |
1267 | } | |
1268 | ||
1269 | /* Return a random protection state mask, but with at least one bit set. */ | |
1270 | static int | |
1271 | rcutorture_extend_mask(int oldmask, struct torture_random_state *trsp) | |
1272 | { | |
1273 | int mask = rcutorture_extend_mask_max(); | |
bf1bef50 PM |
1274 | unsigned long randmask1 = torture_random(trsp) >> 8; |
1275 | unsigned long randmask2 = randmask1 >> 1; | |
2397d072 PM |
1276 | |
1277 | WARN_ON_ONCE(mask >> RCUTORTURE_RDR_SHIFT); | |
bf1bef50 PM |
1278 | /* Half the time lots of bits, half the time only one bit. */ |
1279 | if (randmask1 & 0x1) | |
1280 | mask = mask & randmask2; | |
1281 | else | |
1282 | mask = mask & (1 << (randmask2 % RCUTORTURE_RDR_NBITS)); | |
2397d072 PM |
1283 | if ((mask & RCUTORTURE_RDR_IRQ) && |
1284 | !(mask & RCUTORTURE_RDR_BH) && | |
1285 | (oldmask & RCUTORTURE_RDR_BH)) | |
1286 | mask |= RCUTORTURE_RDR_BH; /* Can't enable bh w/irq disabled. */ | |
1287 | if ((mask & RCUTORTURE_RDR_IRQ) && | |
1288 | !(mask & cur_ops->ext_irq_conflict) && | |
1289 | (oldmask & cur_ops->ext_irq_conflict)) | |
1290 | mask |= cur_ops->ext_irq_conflict; /* Or if readers object. */ | |
1291 | return mask ?: RCUTORTURE_RDR_RCU; | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * Do a randomly selected number of extensions of an existing RCU read-side | |
1296 | * critical section. | |
1297 | */ | |
1298 | static void rcutorture_loop_extend(int *readstate, | |
1299 | struct torture_random_state *trsp) | |
1300 | { | |
1301 | int i; | |
1302 | int mask = rcutorture_extend_mask_max(); | |
1303 | ||
1304 | WARN_ON_ONCE(!*readstate); /* -Existing- RCU read-side critsect! */ | |
1305 | if (!((mask - 1) & mask)) | |
1306 | return; /* Current RCU flavor not extendable. */ | |
1307 | i = (torture_random(trsp) >> 3) & RCUTORTURE_RDR_MAX_LOOPS; | |
1308 | while (i--) { | |
1309 | mask = rcutorture_extend_mask(*readstate, trsp); | |
1310 | rcutorture_one_extend(readstate, mask, trsp); | |
1311 | } | |
1312 | } | |
1313 | ||
6b06aa72 PM |
1314 | /* |
1315 | * Do one read-side critical section, returning false if there was | |
1316 | * no data to read. Can be invoked both from process context and | |
1317 | * from a timer handler. | |
1318 | */ | |
1319 | static bool rcu_torture_one_read(struct torture_random_state *trsp) | |
0729fbf3 | 1320 | { |
917963d0 | 1321 | unsigned long started; |
6b80da42 | 1322 | unsigned long completed; |
2397d072 | 1323 | int newstate; |
0729fbf3 PM |
1324 | struct rcu_torture *p; |
1325 | int pipe_count; | |
2397d072 | 1326 | int readstate = 0; |
52494535 | 1327 | unsigned long long ts; |
0729fbf3 | 1328 | |
2397d072 PM |
1329 | newstate = rcutorture_extend_mask(readstate, trsp); |
1330 | rcutorture_one_extend(&readstate, newstate, trsp); | |
17ef2fe9 | 1331 | started = cur_ops->get_gp_seq(); |
e4aa0da3 | 1332 | ts = rcu_trace_clock_local(); |
632ee200 | 1333 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1334 | rcu_read_lock_bh_held() || |
1335 | rcu_read_lock_sched_held() || | |
5be5d1a1 PM |
1336 | srcu_read_lock_held(srcu_ctlp) || |
1337 | torturing_tasks()); | |
0729fbf3 | 1338 | if (p == NULL) { |
6b06aa72 | 1339 | /* Wait for rcu_torture_writer to get underway */ |
2397d072 | 1340 | rcutorture_one_extend(&readstate, 0, trsp); |
6b06aa72 | 1341 | return false; |
0729fbf3 PM |
1342 | } |
1343 | if (p->rtort_mbtest == 0) | |
1344 | atomic_inc(&n_rcu_torture_mberror); | |
2397d072 | 1345 | rcutorture_loop_extend(&readstate, trsp); |
0729fbf3 PM |
1346 | preempt_disable(); |
1347 | pipe_count = p->rtort_pipe_count; | |
1348 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1349 | /* Should not happen, but... */ | |
1350 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1351 | } | |
17ef2fe9 | 1352 | completed = cur_ops->get_gp_seq(); |
52494535 | 1353 | if (pipe_count > 1) { |
6b06aa72 PM |
1354 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, |
1355 | ts, started, completed); | |
274529ba | 1356 | rcu_ftrace_dump(DUMP_ALL); |
52494535 | 1357 | } |
dd17c8f7 | 1358 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
d7219312 | 1359 | completed = rcutorture_seq_diff(completed, started); |
0729fbf3 PM |
1360 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1361 | /* Should not happen, but... */ | |
1362 | completed = RCU_TORTURE_PIPE_LEN; | |
1363 | } | |
dd17c8f7 | 1364 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 | 1365 | preempt_enable(); |
2397d072 PM |
1366 | rcutorture_one_extend(&readstate, 0, trsp); |
1367 | WARN_ON_ONCE(readstate & RCUTORTURE_RDR_MASK); | |
6b06aa72 PM |
1368 | return true; |
1369 | } | |
1370 | ||
3025520e PM |
1371 | static DEFINE_TORTURE_RANDOM_PERCPU(rcu_torture_timer_rand); |
1372 | ||
0729fbf3 PM |
1373 | /* |
1374 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
1375 | * incrementing the corresponding element of the pipeline array. The | |
1376 | * counter in the element should never be greater than 1, otherwise, the | |
1377 | * RCU implementation is broken. | |
1378 | */ | |
fd30b717 | 1379 | static void rcu_torture_timer(struct timer_list *unused) |
0729fbf3 | 1380 | { |
8da9a595 | 1381 | atomic_long_inc(&n_rcu_torture_timers); |
241b4252 | 1382 | (void)rcu_torture_one_read(this_cpu_ptr(&rcu_torture_timer_rand)); |
f34c8585 PM |
1383 | |
1384 | /* Test call_rcu() invocation from interrupt handler. */ | |
1385 | if (cur_ops->call) { | |
1386 | struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_NOWAIT); | |
1387 | ||
1388 | if (rhp) | |
1389 | cur_ops->call(rhp, rcu_torture_timer_cb); | |
1390 | } | |
0729fbf3 PM |
1391 | } |
1392 | ||
a241ec65 PM |
1393 | /* |
1394 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1395 | * incrementing the corresponding element of the pipeline array. The | |
1396 | * counter in the element should never be greater than 1, otherwise, the | |
1397 | * RCU implementation is broken. | |
1398 | */ | |
1399 | static int | |
1400 | rcu_torture_reader(void *arg) | |
1401 | { | |
444da518 | 1402 | unsigned long lastsleep = jiffies; |
c04dd09b PM |
1403 | long myid = (long)arg; |
1404 | int mynumonline = myid; | |
51b1130e | 1405 | DEFINE_TORTURE_RANDOM(rand); |
0729fbf3 | 1406 | struct timer_list t; |
a241ec65 | 1407 | |
5ccf60f2 | 1408 | VERBOSE_TOROUT_STRING("rcu_torture_reader task started"); |
d277d868 | 1409 | set_user_nice(current, MAX_NICE); |
0acc512c | 1410 | if (irqreader && cur_ops->irq_capable) |
fd30b717 | 1411 | timer_setup_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1412 | |
a241ec65 | 1413 | do { |
0acc512c | 1414 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1415 | if (!timer_pending(&t)) |
6155fec9 | 1416 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1417 | } |
6b06aa72 | 1418 | if (!rcu_torture_one_read(&rand)) |
a241ec65 | 1419 | schedule_timeout_interruptible(HZ); |
444da518 PM |
1420 | if (time_after(jiffies, lastsleep)) { |
1421 | schedule_timeout_interruptible(1); | |
1422 | lastsleep = jiffies + 10; | |
1423 | } | |
c04dd09b PM |
1424 | while (num_online_cpus() < mynumonline && !torture_must_stop()) |
1425 | schedule_timeout_interruptible(HZ / 5); | |
628edaa5 | 1426 | stutter_wait("rcu_torture_reader"); |
36970bb9 | 1427 | } while (!torture_must_stop()); |
424c1b68 | 1428 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1429 | del_timer_sync(&t); |
424c1b68 TG |
1430 | destroy_timer_on_stack(&t); |
1431 | } | |
7fafaac5 | 1432 | torture_kthread_stopping("rcu_torture_reader"); |
a241ec65 PM |
1433 | return 0; |
1434 | } | |
1435 | ||
1436 | /* | |
eea203fe JP |
1437 | * Print torture statistics. Caller must ensure that there is only |
1438 | * one call to this function at a given time!!! This is normally | |
1439 | * accomplished by relying on the module system to only have one copy | |
1440 | * of the module loaded, and then by giving the rcu_torture_stats | |
1441 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1442 | * thread is not running). | |
a241ec65 | 1443 | */ |
d1008950 | 1444 | static void |
eea203fe | 1445 | rcu_torture_stats_print(void) |
a241ec65 | 1446 | { |
a241ec65 PM |
1447 | int cpu; |
1448 | int i; | |
1449 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1450 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
ad0dc7f9 | 1451 | static unsigned long rtcv_snap = ULONG_MAX; |
0032f4e8 | 1452 | static bool splatted; |
4ffa6699 | 1453 | struct task_struct *wtp; |
a241ec65 | 1454 | |
0a945022 | 1455 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1456 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1457 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1458 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1459 | } | |
1460 | } | |
1461 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1462 | if (pipesummary[i] != 0) | |
1463 | break; | |
1464 | } | |
eea203fe JP |
1465 | |
1466 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1467 | pr_cont("rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", | |
1468 | rcu_torture_current, | |
1469 | rcu_torture_current_version, | |
1470 | list_empty(&rcu_torture_freelist), | |
1471 | atomic_read(&n_rcu_torture_alloc), | |
1472 | atomic_read(&n_rcu_torture_alloc_fail), | |
1473 | atomic_read(&n_rcu_torture_free)); | |
472213a6 | 1474 | pr_cont("rtmbe: %d rtbe: %ld rtbke: %ld rtbre: %ld ", |
eea203fe | 1475 | atomic_read(&n_rcu_torture_mberror), |
472213a6 | 1476 | n_rcu_torture_barrier_error, |
eea203fe JP |
1477 | n_rcu_torture_boost_ktrerror, |
1478 | n_rcu_torture_boost_rterror); | |
1479 | pr_cont("rtbf: %ld rtb: %ld nt: %ld ", | |
1480 | n_rcu_torture_boost_failure, | |
1481 | n_rcu_torture_boosts, | |
8da9a595 | 1482 | atomic_long_read(&n_rcu_torture_timers)); |
eea203fe | 1483 | torture_onoff_stats(); |
38706bc5 | 1484 | pr_cont("barrier: %ld/%ld:%ld ", |
eea203fe JP |
1485 | n_barrier_successes, |
1486 | n_barrier_attempts, | |
1487 | n_rcu_torture_barrier_error); | |
38706bc5 | 1488 | pr_cont("cbflood: %ld\n", atomic_long_read(&n_cbfloods)); |
eea203fe JP |
1489 | |
1490 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
8e8be45e | 1491 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
fae4b54f | 1492 | n_rcu_torture_barrier_error != 0 || |
8e8be45e PM |
1493 | n_rcu_torture_boost_ktrerror != 0 || |
1494 | n_rcu_torture_boost_rterror != 0 || | |
fae4b54f PM |
1495 | n_rcu_torture_boost_failure != 0 || |
1496 | i > 1) { | |
eea203fe | 1497 | pr_cont("%s", "!!! "); |
996417d2 | 1498 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1499 | WARN_ON_ONCE(1); |
996417d2 | 1500 | } |
eea203fe | 1501 | pr_cont("Reader Pipe: "); |
a241ec65 | 1502 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1503 | pr_cont(" %ld", pipesummary[i]); |
1504 | pr_cont("\n"); | |
1505 | ||
1506 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1507 | pr_cont("Reader Batch: "); | |
72e9bb54 | 1508 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
eea203fe JP |
1509 | pr_cont(" %ld", batchsummary[i]); |
1510 | pr_cont("\n"); | |
1511 | ||
1512 | pr_alert("%s%s ", torture_type, TORTURE_FLAG); | |
1513 | pr_cont("Free-Block Circulation: "); | |
a241ec65 | 1514 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
eea203fe | 1515 | pr_cont(" %d", atomic_read(&rcu_torture_wcount[i])); |
a241ec65 | 1516 | } |
eea203fe JP |
1517 | pr_cont("\n"); |
1518 | ||
c8e5b163 | 1519 | if (cur_ops->stats) |
eea203fe | 1520 | cur_ops->stats(); |
ad0dc7f9 PM |
1521 | if (rtcv_snap == rcu_torture_current_version && |
1522 | rcu_torture_current != NULL) { | |
7f6733c3 | 1523 | int __maybe_unused flags = 0; |
aebc8264 | 1524 | unsigned long __maybe_unused gp_seq = 0; |
ad0dc7f9 PM |
1525 | |
1526 | rcutorture_get_gp_data(cur_ops->ttype, | |
aebc8264 | 1527 | &flags, &gp_seq); |
7f6733c3 | 1528 | srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, |
aebc8264 | 1529 | &flags, &gp_seq); |
4ffa6699 | 1530 | wtp = READ_ONCE(writer_task); |
aebc8264 | 1531 | pr_alert("??? Writer stall state %s(%d) g%lu f%#x ->state %#lx cpu %d\n", |
18aff33e | 1532 | rcu_torture_writer_state_getname(), |
aebc8264 | 1533 | rcu_torture_writer_state, gp_seq, flags, |
808de39c PM |
1534 | wtp == NULL ? ~0UL : wtp->state, |
1535 | wtp == NULL ? -1 : (int)task_cpu(wtp)); | |
0032f4e8 PM |
1536 | if (!splatted && wtp) { |
1537 | sched_show_task(wtp); | |
1538 | splatted = true; | |
1539 | } | |
afea227f | 1540 | show_rcu_gp_kthreads(); |
274529ba | 1541 | rcu_ftrace_dump(DUMP_ALL); |
ad0dc7f9 PM |
1542 | } |
1543 | rtcv_snap = rcu_torture_current_version; | |
a241ec65 PM |
1544 | } |
1545 | ||
a241ec65 PM |
1546 | /* |
1547 | * Periodically prints torture statistics, if periodic statistics printing | |
1548 | * was specified via the stat_interval module parameter. | |
a241ec65 PM |
1549 | */ |
1550 | static int | |
1551 | rcu_torture_stats(void *arg) | |
1552 | { | |
5ccf60f2 | 1553 | VERBOSE_TOROUT_STRING("rcu_torture_stats task started"); |
a241ec65 PM |
1554 | do { |
1555 | schedule_timeout_interruptible(stat_interval * HZ); | |
1556 | rcu_torture_stats_print(); | |
f67a3356 | 1557 | torture_shutdown_absorb("rcu_torture_stats"); |
36970bb9 | 1558 | } while (!torture_must_stop()); |
7fafaac5 | 1559 | torture_kthread_stopping("rcu_torture_stats"); |
d120f65f PM |
1560 | return 0; |
1561 | } | |
1562 | ||
eac45e58 | 1563 | static void |
e66c33d5 | 1564 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, const char *tag) |
95c38322 | 1565 | { |
2caa1e44 PM |
1566 | pr_alert("%s" TORTURE_FLAG |
1567 | "--- %s: nreaders=%d nfakewriters=%d " | |
1568 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " | |
1569 | "shuffle_interval=%d stutter=%d irqreader=%d " | |
1570 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " | |
1571 | "test_boost=%d/%d test_boost_interval=%d " | |
1572 | "test_boost_duration=%d shutdown_secs=%d " | |
2b1516e5 | 1573 | "stall_cpu=%d stall_cpu_holdoff=%d stall_cpu_irqsoff=%d " |
67afeed2 | 1574 | "n_barrier_cbs=%d " |
2caa1e44 PM |
1575 | "onoff_interval=%d onoff_holdoff=%d\n", |
1576 | torture_type, tag, nrealreaders, nfakewriters, | |
1577 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, | |
1578 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, | |
1579 | test_boost, cur_ops->can_boost, | |
1580 | test_boost_interval, test_boost_duration, shutdown_secs, | |
2b1516e5 | 1581 | stall_cpu, stall_cpu_holdoff, stall_cpu_irqsoff, |
67afeed2 | 1582 | n_barrier_cbs, |
2caa1e44 | 1583 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1584 | } |
1585 | ||
0ffd374b | 1586 | static int rcutorture_booster_cleanup(unsigned int cpu) |
8e8be45e PM |
1587 | { |
1588 | struct task_struct *t; | |
1589 | ||
1590 | if (boost_tasks[cpu] == NULL) | |
0ffd374b | 1591 | return 0; |
8e8be45e | 1592 | mutex_lock(&boost_mutex); |
8e8be45e PM |
1593 | t = boost_tasks[cpu]; |
1594 | boost_tasks[cpu] = NULL; | |
450efca7 | 1595 | rcu_torture_enable_rt_throttle(); |
8e8be45e PM |
1596 | mutex_unlock(&boost_mutex); |
1597 | ||
1598 | /* This must be outside of the mutex, otherwise deadlock! */ | |
9c029b86 | 1599 | torture_stop_kthread(rcu_torture_boost, t); |
0ffd374b | 1600 | return 0; |
8e8be45e PM |
1601 | } |
1602 | ||
0ffd374b | 1603 | static int rcutorture_booster_init(unsigned int cpu) |
8e8be45e PM |
1604 | { |
1605 | int retval; | |
1606 | ||
1607 | if (boost_tasks[cpu] != NULL) | |
1608 | return 0; /* Already created, nothing more to do. */ | |
1609 | ||
1610 | /* Don't allow time recalculation while creating a new task. */ | |
1611 | mutex_lock(&boost_mutex); | |
450efca7 | 1612 | rcu_torture_disable_rt_throttle(); |
5ccf60f2 | 1613 | VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task"); |
1f288094 ED |
1614 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1615 | cpu_to_node(cpu), | |
1616 | "rcu_torture_boost"); | |
8e8be45e PM |
1617 | if (IS_ERR(boost_tasks[cpu])) { |
1618 | retval = PTR_ERR(boost_tasks[cpu]); | |
5ccf60f2 | 1619 | VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed"); |
8e8be45e PM |
1620 | n_rcu_torture_boost_ktrerror++; |
1621 | boost_tasks[cpu] = NULL; | |
1622 | mutex_unlock(&boost_mutex); | |
1623 | return retval; | |
1624 | } | |
1625 | kthread_bind(boost_tasks[cpu], cpu); | |
1626 | wake_up_process(boost_tasks[cpu]); | |
1627 | mutex_unlock(&boost_mutex); | |
1628 | return 0; | |
1629 | } | |
1630 | ||
c13f3757 PM |
1631 | /* |
1632 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1633 | * induces a CPU stall for the time specified by stall_cpu. | |
1634 | */ | |
49fb4c62 | 1635 | static int rcu_torture_stall(void *args) |
c13f3757 PM |
1636 | { |
1637 | unsigned long stop_at; | |
1638 | ||
5ccf60f2 | 1639 | VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); |
c13f3757 | 1640 | if (stall_cpu_holdoff > 0) { |
5ccf60f2 | 1641 | VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); |
c13f3757 | 1642 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); |
5ccf60f2 | 1643 | VERBOSE_TOROUT_STRING("rcu_torture_stall end holdoff"); |
c13f3757 PM |
1644 | } |
1645 | if (!kthread_should_stop()) { | |
622be33f | 1646 | stop_at = ktime_get_seconds() + stall_cpu; |
c13f3757 | 1647 | /* RCU CPU stall is expected behavior in following code. */ |
c13f3757 | 1648 | rcu_read_lock(); |
2b1516e5 PM |
1649 | if (stall_cpu_irqsoff) |
1650 | local_irq_disable(); | |
1651 | else | |
1652 | preempt_disable(); | |
1653 | pr_alert("rcu_torture_stall start on CPU %d.\n", | |
1654 | smp_processor_id()); | |
622be33f AB |
1655 | while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(), |
1656 | stop_at)) | |
c13f3757 | 1657 | continue; /* Induce RCU CPU stall warning. */ |
2b1516e5 PM |
1658 | if (stall_cpu_irqsoff) |
1659 | local_irq_enable(); | |
1660 | else | |
1661 | preempt_enable(); | |
c13f3757 | 1662 | rcu_read_unlock(); |
2caa1e44 | 1663 | pr_alert("rcu_torture_stall end.\n"); |
c13f3757 | 1664 | } |
f67a3356 | 1665 | torture_shutdown_absorb("rcu_torture_stall"); |
c13f3757 PM |
1666 | while (!kthread_should_stop()) |
1667 | schedule_timeout_interruptible(10 * HZ); | |
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1672 | static int __init rcu_torture_stall_init(void) | |
1673 | { | |
c13f3757 PM |
1674 | if (stall_cpu <= 0) |
1675 | return 0; | |
47cf29b9 | 1676 | return torture_create_kthread(rcu_torture_stall, NULL, stall_task); |
c13f3757 PM |
1677 | } |
1678 | ||
9fdcb9af PM |
1679 | /* State structure for forward-progress self-propagating RCU callback. */ |
1680 | struct fwd_cb_state { | |
1681 | struct rcu_head rh; | |
1682 | int stop; | |
1683 | }; | |
1684 | ||
1685 | /* | |
1686 | * Forward-progress self-propagating RCU callback function. Because | |
1687 | * callbacks run from softirq, this function is an implicit RCU read-side | |
1688 | * critical section. | |
1689 | */ | |
1690 | static void rcu_torture_fwd_prog_cb(struct rcu_head *rhp) | |
1691 | { | |
1692 | struct fwd_cb_state *fcsp = container_of(rhp, struct fwd_cb_state, rh); | |
1693 | ||
1694 | if (READ_ONCE(fcsp->stop)) { | |
1695 | WRITE_ONCE(fcsp->stop, 2); | |
1696 | return; | |
1697 | } | |
1698 | cur_ops->call(&fcsp->rh, rcu_torture_fwd_prog_cb); | |
1699 | } | |
1700 | ||
1b27291b PM |
1701 | /* Carry out grace-period forward-progress testing. */ |
1702 | static int rcu_torture_fwd_prog(void *args) | |
1703 | { | |
119248be | 1704 | unsigned long cver; |
f4de46ed | 1705 | unsigned long dur; |
9fdcb9af | 1706 | struct fwd_cb_state fcs = { .stop = 0 }; |
119248be | 1707 | unsigned long gps; |
1b27291b | 1708 | int idx; |
08a7a2ec PM |
1709 | int sd; |
1710 | int sd4; | |
9fdcb9af | 1711 | bool selfpropcb = false; |
1b27291b | 1712 | unsigned long stopat; |
f4de46ed | 1713 | int tested = 0; |
152f4afb | 1714 | int tested_tries = 0; |
08a7a2ec | 1715 | static DEFINE_TORTURE_RANDOM(trs); |
1b27291b PM |
1716 | |
1717 | VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started"); | |
fecad509 PM |
1718 | if (!IS_ENABLED(CONFIG_SMP) || !IS_ENABLED(CONFIG_RCU_BOOST)) |
1719 | set_user_nice(current, MAX_NICE); | |
9fdcb9af PM |
1720 | if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) { |
1721 | init_rcu_head_on_stack(&fcs.rh); | |
1722 | cur_ops->call(&fcs.rh, rcu_torture_fwd_prog_cb); | |
1723 | selfpropcb = true; | |
1724 | } | |
1b27291b PM |
1725 | do { |
1726 | schedule_timeout_interruptible(fwd_progress_holdoff * HZ); | |
119248be PM |
1727 | cver = READ_ONCE(rcu_torture_current_version); |
1728 | gps = cur_ops->get_gp_seq(); | |
08a7a2ec PM |
1729 | sd = cur_ops->stall_dur() + 1; |
1730 | sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div; | |
f4de46ed PM |
1731 | dur = sd4 + torture_random(&trs) % (sd - sd4); |
1732 | stopat = jiffies + dur; | |
1b27291b PM |
1733 | while (time_before(jiffies, stopat) && !torture_must_stop()) { |
1734 | idx = cur_ops->readlock(); | |
1735 | udelay(10); | |
1736 | cur_ops->readunlock(idx); | |
1737 | if (!fwd_progress_need_resched || need_resched()) | |
1738 | cond_resched(); | |
1739 | } | |
152f4afb | 1740 | tested_tries++; |
1b27291b | 1741 | if (!time_before(jiffies, stopat) && !torture_must_stop()) { |
f4de46ed PM |
1742 | tested++; |
1743 | cver = READ_ONCE(rcu_torture_current_version) - cver; | |
119248be | 1744 | gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps); |
f4de46ed PM |
1745 | WARN_ON(!cver && gps < 2); |
1746 | pr_alert("%s: Duration %ld cver %ld gps %ld\n", __func__, dur, cver, gps); | |
1b27291b PM |
1747 | } |
1748 | /* Avoid slow periods, better to test when busy. */ | |
1749 | stutter_wait("rcu_torture_fwd_prog"); | |
1750 | } while (!torture_must_stop()); | |
9fdcb9af PM |
1751 | if (selfpropcb) { |
1752 | WRITE_ONCE(fcs.stop, 1); | |
1753 | cur_ops->sync(); /* Wait for running callback to complete. */ | |
1754 | cur_ops->cb_barrier(); /* Wait for queued callbacks. */ | |
1755 | WARN_ON(READ_ONCE(fcs.stop) != 2); | |
1756 | destroy_rcu_head_on_stack(&fcs.rh); | |
1757 | } | |
152f4afb PM |
1758 | /* Short runs might not contain a valid forward-progress attempt. */ |
1759 | WARN_ON(!tested && tested_tries >= 5); | |
f4de46ed | 1760 | pr_alert("%s: tested %d tested_tries %d\n", __func__, tested, tested_tries); |
1b27291b PM |
1761 | torture_kthread_stopping("rcu_torture_fwd_prog"); |
1762 | return 0; | |
1763 | } | |
1764 | ||
1765 | /* If forward-progress checking is requested and feasible, spawn the thread. */ | |
1766 | static int __init rcu_torture_fwd_prog_init(void) | |
1767 | { | |
1768 | if (!fwd_progress) | |
1769 | return 0; /* Not requested, so don't do it. */ | |
1770 | if (!cur_ops->stall_dur || cur_ops->stall_dur() <= 0) { | |
1771 | VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Disabled, unsupported by RCU flavor under test"); | |
1772 | return 0; | |
1773 | } | |
1774 | if (stall_cpu > 0) { | |
1775 | VERBOSE_TOROUT_STRING("rcu_torture_fwd_prog_init: Disabled, conflicts with CPU-stall testing"); | |
1776 | if (IS_MODULE(CONFIG_RCU_TORTURE_TESTS)) | |
1777 | return -EINVAL; /* In module, can fail back to user. */ | |
1778 | WARN_ON(1); /* Make sure rcutorture notices conflict. */ | |
1779 | return 0; | |
1780 | } | |
1781 | if (fwd_progress_holdoff <= 0) | |
1782 | fwd_progress_holdoff = 1; | |
1783 | if (fwd_progress_div <= 0) | |
1784 | fwd_progress_div = 4; | |
1785 | return torture_create_kthread(rcu_torture_fwd_prog, | |
1786 | NULL, fwd_prog_task); | |
1787 | } | |
1788 | ||
fae4b54f | 1789 | /* Callback function for RCU barrier testing. */ |
b3b8a4d4 | 1790 | static void rcu_torture_barrier_cbf(struct rcu_head *rcu) |
fae4b54f PM |
1791 | { |
1792 | atomic_inc(&barrier_cbs_invoked); | |
1793 | } | |
1794 | ||
1795 | /* kthread function to register callbacks used to test RCU barriers. */ | |
1796 | static int rcu_torture_barrier_cbs(void *arg) | |
1797 | { | |
1798 | long myid = (long)arg; | |
c6ebcbb6 | 1799 | bool lastphase = 0; |
78e4bc34 | 1800 | bool newphase; |
fae4b54f PM |
1801 | struct rcu_head rcu; |
1802 | ||
1803 | init_rcu_head_on_stack(&rcu); | |
5ccf60f2 | 1804 | VERBOSE_TOROUT_STRING("rcu_torture_barrier_cbs task started"); |
d277d868 | 1805 | set_user_nice(current, MAX_NICE); |
fae4b54f PM |
1806 | do { |
1807 | wait_event(barrier_cbs_wq[myid], | |
78e4bc34 | 1808 | (newphase = |
6c7ed42c | 1809 | smp_load_acquire(&barrier_phase)) != lastphase || |
36970bb9 | 1810 | torture_must_stop()); |
78e4bc34 | 1811 | lastphase = newphase; |
36970bb9 | 1812 | if (torture_must_stop()) |
fae4b54f | 1813 | break; |
6c7ed42c PM |
1814 | /* |
1815 | * The above smp_load_acquire() ensures barrier_phase load | |
aab05738 | 1816 | * is ordered before the following ->call(). |
6c7ed42c | 1817 | */ |
0aa67e75 | 1818 | local_irq_disable(); /* Just to test no-irq call_rcu(). */ |
fae4b54f | 1819 | cur_ops->call(&rcu, rcu_torture_barrier_cbf); |
0aa67e75 | 1820 | local_irq_enable(); |
fae4b54f PM |
1821 | if (atomic_dec_and_test(&barrier_cbs_count)) |
1822 | wake_up(&barrier_wq); | |
36970bb9 | 1823 | } while (!torture_must_stop()); |
69c60455 PM |
1824 | if (cur_ops->cb_barrier != NULL) |
1825 | cur_ops->cb_barrier(); | |
fae4b54f | 1826 | destroy_rcu_head_on_stack(&rcu); |
7fafaac5 | 1827 | torture_kthread_stopping("rcu_torture_barrier_cbs"); |
fae4b54f PM |
1828 | return 0; |
1829 | } | |
1830 | ||
1831 | /* kthread function to drive and coordinate RCU barrier testing. */ | |
1832 | static int rcu_torture_barrier(void *arg) | |
1833 | { | |
1834 | int i; | |
1835 | ||
5ccf60f2 | 1836 | VERBOSE_TOROUT_STRING("rcu_torture_barrier task starting"); |
fae4b54f PM |
1837 | do { |
1838 | atomic_set(&barrier_cbs_invoked, 0); | |
1839 | atomic_set(&barrier_cbs_count, n_barrier_cbs); | |
6c7ed42c PM |
1840 | /* Ensure barrier_phase ordered after prior assignments. */ |
1841 | smp_store_release(&barrier_phase, !barrier_phase); | |
fae4b54f PM |
1842 | for (i = 0; i < n_barrier_cbs; i++) |
1843 | wake_up(&barrier_cbs_wq[i]); | |
1844 | wait_event(barrier_wq, | |
1845 | atomic_read(&barrier_cbs_count) == 0 || | |
36970bb9 PM |
1846 | torture_must_stop()); |
1847 | if (torture_must_stop()) | |
fae4b54f PM |
1848 | break; |
1849 | n_barrier_attempts++; | |
78e4bc34 | 1850 | cur_ops->cb_barrier(); /* Implies smp_mb() for wait_event(). */ |
fae4b54f PM |
1851 | if (atomic_read(&barrier_cbs_invoked) != n_barrier_cbs) { |
1852 | n_rcu_torture_barrier_error++; | |
7602de4a PM |
1853 | pr_err("barrier_cbs_invoked = %d, n_barrier_cbs = %d\n", |
1854 | atomic_read(&barrier_cbs_invoked), | |
1855 | n_barrier_cbs); | |
fae4b54f | 1856 | WARN_ON_ONCE(1); |
bf5b6435 JFG |
1857 | } else { |
1858 | n_barrier_successes++; | |
fae4b54f | 1859 | } |
fae4b54f | 1860 | schedule_timeout_interruptible(HZ / 10); |
36970bb9 | 1861 | } while (!torture_must_stop()); |
7fafaac5 | 1862 | torture_kthread_stopping("rcu_torture_barrier"); |
fae4b54f PM |
1863 | return 0; |
1864 | } | |
1865 | ||
1866 | /* Initialize RCU barrier testing. */ | |
1867 | static int rcu_torture_barrier_init(void) | |
1868 | { | |
1869 | int i; | |
1870 | int ret; | |
1871 | ||
d9eba768 | 1872 | if (n_barrier_cbs <= 0) |
fae4b54f PM |
1873 | return 0; |
1874 | if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) { | |
2caa1e44 PM |
1875 | pr_alert("%s" TORTURE_FLAG |
1876 | " Call or barrier ops missing for %s,\n", | |
1877 | torture_type, cur_ops->name); | |
1878 | pr_alert("%s" TORTURE_FLAG | |
1879 | " RCU barrier testing omitted from run.\n", | |
1880 | torture_type); | |
fae4b54f PM |
1881 | return 0; |
1882 | } | |
1883 | atomic_set(&barrier_cbs_count, 0); | |
1884 | atomic_set(&barrier_cbs_invoked, 0); | |
1885 | barrier_cbs_tasks = | |
68a675d4 | 1886 | kcalloc(n_barrier_cbs, sizeof(barrier_cbs_tasks[0]), |
fae4b54f PM |
1887 | GFP_KERNEL); |
1888 | barrier_cbs_wq = | |
68a675d4 | 1889 | kcalloc(n_barrier_cbs, sizeof(barrier_cbs_wq[0]), GFP_KERNEL); |
de5e6437 | 1890 | if (barrier_cbs_tasks == NULL || !barrier_cbs_wq) |
fae4b54f PM |
1891 | return -ENOMEM; |
1892 | for (i = 0; i < n_barrier_cbs; i++) { | |
1893 | init_waitqueue_head(&barrier_cbs_wq[i]); | |
47cf29b9 PM |
1894 | ret = torture_create_kthread(rcu_torture_barrier_cbs, |
1895 | (void *)(long)i, | |
1896 | barrier_cbs_tasks[i]); | |
1897 | if (ret) | |
fae4b54f | 1898 | return ret; |
fae4b54f | 1899 | } |
47cf29b9 | 1900 | return torture_create_kthread(rcu_torture_barrier, NULL, barrier_task); |
fae4b54f PM |
1901 | } |
1902 | ||
1903 | /* Clean up after RCU barrier testing. */ | |
1904 | static void rcu_torture_barrier_cleanup(void) | |
1905 | { | |
1906 | int i; | |
1907 | ||
9c029b86 | 1908 | torture_stop_kthread(rcu_torture_barrier, barrier_task); |
fae4b54f | 1909 | if (barrier_cbs_tasks != NULL) { |
9c029b86 PM |
1910 | for (i = 0; i < n_barrier_cbs; i++) |
1911 | torture_stop_kthread(rcu_torture_barrier_cbs, | |
1912 | barrier_cbs_tasks[i]); | |
fae4b54f PM |
1913 | kfree(barrier_cbs_tasks); |
1914 | barrier_cbs_tasks = NULL; | |
1915 | } | |
1916 | if (barrier_cbs_wq != NULL) { | |
1917 | kfree(barrier_cbs_wq); | |
1918 | barrier_cbs_wq = NULL; | |
1919 | } | |
1920 | } | |
1921 | ||
4babd855 JFG |
1922 | static bool rcu_torture_can_boost(void) |
1923 | { | |
1924 | static int boost_warn_once; | |
1925 | int prio; | |
1926 | ||
1927 | if (!(test_boost == 1 && cur_ops->can_boost) && test_boost != 2) | |
1928 | return false; | |
1929 | ||
1930 | prio = rcu_get_gp_kthreads_prio(); | |
1931 | if (!prio) | |
1932 | return false; | |
1933 | ||
1934 | if (prio < 2) { | |
1935 | if (boost_warn_once == 1) | |
1936 | return false; | |
1937 | ||
bf5b6435 | 1938 | pr_alert("%s: WARN: RCU kthread priority too low to test boosting. Skipping RCU boost test. Try passing rcutree.kthread_prio > 1 on the kernel command line.\n", KBUILD_MODNAME); |
4babd855 JFG |
1939 | boost_warn_once = 1; |
1940 | return false; | |
1941 | } | |
1942 | ||
1943 | return true; | |
1944 | } | |
1945 | ||
0ffd374b | 1946 | static enum cpuhp_state rcutor_hp; |
8e8be45e | 1947 | |
a241ec65 PM |
1948 | static void |
1949 | rcu_torture_cleanup(void) | |
1950 | { | |
034777d7 | 1951 | int flags = 0; |
aebc8264 | 1952 | unsigned long gp_seq = 0; |
a241ec65 PM |
1953 | int i; |
1954 | ||
d36a7a0d | 1955 | if (torture_cleanup_begin()) { |
343e9099 PM |
1956 | if (cur_ops->cb_barrier != NULL) |
1957 | cur_ops->cb_barrier(); | |
1958 | return; | |
1959 | } | |
d84f5203 | 1960 | |
fae4b54f | 1961 | rcu_torture_barrier_cleanup(); |
1b27291b | 1962 | torture_stop_kthread(rcu_torture_fwd_prog, fwd_prog_task); |
9c029b86 | 1963 | torture_stop_kthread(rcu_torture_stall, stall_task); |
9c029b86 | 1964 | torture_stop_kthread(rcu_torture_writer, writer_task); |
a241ec65 | 1965 | |
c8e5b163 | 1966 | if (reader_tasks) { |
9c029b86 PM |
1967 | for (i = 0; i < nrealreaders; i++) |
1968 | torture_stop_kthread(rcu_torture_reader, | |
1969 | reader_tasks[i]); | |
a241ec65 | 1970 | kfree(reader_tasks); |
a241ec65 PM |
1971 | } |
1972 | rcu_torture_current = NULL; | |
1973 | ||
c8e5b163 | 1974 | if (fakewriter_tasks) { |
b772e1dd | 1975 | for (i = 0; i < nfakewriters; i++) { |
9c029b86 PM |
1976 | torture_stop_kthread(rcu_torture_fakewriter, |
1977 | fakewriter_tasks[i]); | |
b772e1dd JT |
1978 | } |
1979 | kfree(fakewriter_tasks); | |
1980 | fakewriter_tasks = NULL; | |
1981 | } | |
1982 | ||
aebc8264 PM |
1983 | rcutorture_get_gp_data(cur_ops->ttype, &flags, &gp_seq); |
1984 | srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp, &flags, &gp_seq); | |
1985 | pr_alert("%s: End-test grace-period state: g%lu f%#x\n", | |
1986 | cur_ops->name, gp_seq, flags); | |
9c029b86 PM |
1987 | torture_stop_kthread(rcu_torture_stats, stats_task); |
1988 | torture_stop_kthread(rcu_torture_fqs, fqs_task); | |
38706bc5 PM |
1989 | for (i = 0; i < ncbflooders; i++) |
1990 | torture_stop_kthread(rcu_torture_cbflood, cbflood_task[i]); | |
4babd855 | 1991 | if (rcu_torture_can_boost()) |
0ffd374b | 1992 | cpuhp_remove_state(rcutor_hp); |
bf66f18e | 1993 | |
ca1d51ed PM |
1994 | /* |
1995 | * Wait for all RCU callbacks to fire, then do flavor-specific | |
1996 | * cleanup operations. | |
1997 | */ | |
2326974d PM |
1998 | if (cur_ops->cb_barrier != NULL) |
1999 | cur_ops->cb_barrier(); | |
ca1d51ed PM |
2000 | if (cur_ops->cleanup != NULL) |
2001 | cur_ops->cleanup(); | |
a241ec65 | 2002 | |
a241ec65 | 2003 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 2004 | |
fae4b54f | 2005 | if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) |
8e8be45e | 2006 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
2e9e8081 | 2007 | else if (torture_onoff_failures()) |
091541bb PM |
2008 | rcu_torture_print_module_parms(cur_ops, |
2009 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 2010 | else |
8e8be45e | 2011 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
d36a7a0d | 2012 | torture_cleanup_end(); |
a241ec65 PM |
2013 | } |
2014 | ||
d2818df1 PM |
2015 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD |
2016 | static void rcu_torture_leak_cb(struct rcu_head *rhp) | |
2017 | { | |
2018 | } | |
2019 | ||
2020 | static void rcu_torture_err_cb(struct rcu_head *rhp) | |
2021 | { | |
2022 | /* | |
2023 | * This -might- happen due to race conditions, but is unlikely. | |
2024 | * The scenario that leads to this happening is that the | |
2025 | * first of the pair of duplicate callbacks is queued, | |
2026 | * someone else starts a grace period that includes that | |
2027 | * callback, then the second of the pair must wait for the | |
2028 | * next grace period. Unlikely, but can happen. If it | |
2029 | * does happen, the debug-objects subsystem won't have splatted. | |
2030 | */ | |
e0d31a34 | 2031 | pr_alert("%s: duplicated callback was invoked.\n", KBUILD_MODNAME); |
d2818df1 PM |
2032 | } |
2033 | #endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
2034 | ||
2035 | /* | |
2036 | * Verify that double-free causes debug-objects to complain, but only | |
2037 | * if CONFIG_DEBUG_OBJECTS_RCU_HEAD=y. Otherwise, say that the test | |
2038 | * cannot be carried out. | |
2039 | */ | |
2040 | static void rcu_test_debug_objects(void) | |
2041 | { | |
2042 | #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD | |
2043 | struct rcu_head rh1; | |
2044 | struct rcu_head rh2; | |
2045 | ||
2046 | init_rcu_head_on_stack(&rh1); | |
2047 | init_rcu_head_on_stack(&rh2); | |
e0d31a34 | 2048 | pr_alert("%s: WARN: Duplicate call_rcu() test starting.\n", KBUILD_MODNAME); |
d2818df1 PM |
2049 | |
2050 | /* Try to queue the rh2 pair of callbacks for the same grace period. */ | |
2051 | preempt_disable(); /* Prevent preemption from interrupting test. */ | |
2052 | rcu_read_lock(); /* Make it impossible to finish a grace period. */ | |
2053 | call_rcu(&rh1, rcu_torture_leak_cb); /* Start grace period. */ | |
2054 | local_irq_disable(); /* Make it harder to start a new grace period. */ | |
2055 | call_rcu(&rh2, rcu_torture_leak_cb); | |
2056 | call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */ | |
2057 | local_irq_enable(); | |
2058 | rcu_read_unlock(); | |
2059 | preempt_enable(); | |
2060 | ||
2061 | /* Wait for them all to get done so we can safely return. */ | |
2062 | rcu_barrier(); | |
e0d31a34 | 2063 | pr_alert("%s: WARN: Duplicate call_rcu() test complete.\n", KBUILD_MODNAME); |
d2818df1 PM |
2064 | destroy_rcu_head_on_stack(&rh1); |
2065 | destroy_rcu_head_on_stack(&rh2); | |
2066 | #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ | |
e0d31a34 | 2067 | pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n", KBUILD_MODNAME); |
d2818df1 PM |
2068 | #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ |
2069 | } | |
2070 | ||
6f8bc500 | 2071 | static int __init |
a241ec65 PM |
2072 | rcu_torture_init(void) |
2073 | { | |
c04dd09b | 2074 | long i; |
a241ec65 PM |
2075 | int cpu; |
2076 | int firsterr = 0; | |
2ec1f2d9 | 2077 | static struct rcu_torture_ops *torture_ops[] = { |
ca1d51ed | 2078 | &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops, |
2397d072 | 2079 | &busted_srcud_ops, &sched_ops, &tasks_ops, |
2ec1f2d9 | 2080 | }; |
a241ec65 | 2081 | |
a2f2577d | 2082 | if (!torture_init_begin(torture_type, verbose)) |
5228084e | 2083 | return -EBUSY; |
343e9099 | 2084 | |
a241ec65 | 2085 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 2086 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 2087 | cur_ops = torture_ops[i]; |
ade5fb81 | 2088 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 2089 | break; |
72e9bb54 | 2090 | } |
ade5fb81 | 2091 | if (i == ARRAY_SIZE(torture_ops)) { |
2caa1e44 PM |
2092 | pr_alert("rcu-torture: invalid torture type: \"%s\"\n", |
2093 | torture_type); | |
2094 | pr_alert("rcu-torture types:"); | |
cf886c44 | 2095 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) |
a7538352 JP |
2096 | pr_cont(" %s", torture_ops[i]->name); |
2097 | pr_cont("\n"); | |
e746b558 | 2098 | WARN_ON(!IS_MODULE(CONFIG_RCU_TORTURE_TEST)); |
889d487a PM |
2099 | firsterr = -EINVAL; |
2100 | goto unwind; | |
72e9bb54 | 2101 | } |
bf66f18e | 2102 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
2caa1e44 | 2103 | pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n"); |
bf66f18e PM |
2104 | fqs_duration = 0; |
2105 | } | |
c8e5b163 | 2106 | if (cur_ops->init) |
889d487a | 2107 | cur_ops->init(); |
72e9bb54 | 2108 | |
64e4b43a | 2109 | if (nreaders >= 0) { |
a241ec65 | 2110 | nrealreaders = nreaders; |
64e4b43a | 2111 | } else { |
3838cc18 | 2112 | nrealreaders = num_online_cpus() - 2 - nreaders; |
64e4b43a PM |
2113 | if (nrealreaders <= 0) |
2114 | nrealreaders = 1; | |
2115 | } | |
8e8be45e | 2116 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
a241ec65 PM |
2117 | |
2118 | /* Set up the freelist. */ | |
2119 | ||
2120 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 2121 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 2122 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
2123 | list_add_tail(&rcu_tortures[i].rtort_free, |
2124 | &rcu_torture_freelist); | |
2125 | } | |
2126 | ||
2127 | /* Initialize the statistics so that each run gets its own numbers. */ | |
2128 | ||
2129 | rcu_torture_current = NULL; | |
2130 | rcu_torture_current_version = 0; | |
2131 | atomic_set(&n_rcu_torture_alloc, 0); | |
2132 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
2133 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
2134 | atomic_set(&n_rcu_torture_mberror, 0); |
2135 | atomic_set(&n_rcu_torture_error, 0); | |
fae4b54f | 2136 | n_rcu_torture_barrier_error = 0; |
8e8be45e PM |
2137 | n_rcu_torture_boost_ktrerror = 0; |
2138 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
2139 | n_rcu_torture_boost_failure = 0; |
2140 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
2141 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
2142 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 2143 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
2144 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
2145 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
2146 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | /* Start up the kthreads. */ | |
2151 | ||
47cf29b9 PM |
2152 | firsterr = torture_create_kthread(rcu_torture_writer, NULL, |
2153 | writer_task); | |
2154 | if (firsterr) | |
a241ec65 | 2155 | goto unwind; |
4444d852 | 2156 | if (nfakewriters > 0) { |
68a675d4 | 2157 | fakewriter_tasks = kcalloc(nfakewriters, |
4444d852 PM |
2158 | sizeof(fakewriter_tasks[0]), |
2159 | GFP_KERNEL); | |
2160 | if (fakewriter_tasks == NULL) { | |
2161 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
2162 | firsterr = -ENOMEM; | |
2163 | goto unwind; | |
2164 | } | |
b772e1dd JT |
2165 | } |
2166 | for (i = 0; i < nfakewriters; i++) { | |
47cf29b9 PM |
2167 | firsterr = torture_create_kthread(rcu_torture_fakewriter, |
2168 | NULL, fakewriter_tasks[i]); | |
2169 | if (firsterr) | |
b772e1dd | 2170 | goto unwind; |
b772e1dd | 2171 | } |
68a675d4 | 2172 | reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]), |
a241ec65 PM |
2173 | GFP_KERNEL); |
2174 | if (reader_tasks == NULL) { | |
5ccf60f2 | 2175 | VERBOSE_TOROUT_ERRSTRING("out of memory"); |
a241ec65 PM |
2176 | firsterr = -ENOMEM; |
2177 | goto unwind; | |
2178 | } | |
2179 | for (i = 0; i < nrealreaders; i++) { | |
c04dd09b | 2180 | firsterr = torture_create_kthread(rcu_torture_reader, (void *)i, |
47cf29b9 PM |
2181 | reader_tasks[i]); |
2182 | if (firsterr) | |
a241ec65 | 2183 | goto unwind; |
a241ec65 PM |
2184 | } |
2185 | if (stat_interval > 0) { | |
47cf29b9 PM |
2186 | firsterr = torture_create_kthread(rcu_torture_stats, NULL, |
2187 | stats_task); | |
2188 | if (firsterr) | |
a241ec65 | 2189 | goto unwind; |
a241ec65 | 2190 | } |
e8e255f7 | 2191 | if (test_no_idle_hz && shuffle_interval > 0) { |
3808dc9f PM |
2192 | firsterr = torture_shuffle_init(shuffle_interval * HZ); |
2193 | if (firsterr) | |
d84f5203 | 2194 | goto unwind; |
d84f5203 | 2195 | } |
d120f65f PM |
2196 | if (stutter < 0) |
2197 | stutter = 0; | |
2198 | if (stutter) { | |
628edaa5 PM |
2199 | firsterr = torture_stutter_init(stutter * HZ); |
2200 | if (firsterr) | |
d120f65f | 2201 | goto unwind; |
d120f65f | 2202 | } |
bf66f18e PM |
2203 | if (fqs_duration < 0) |
2204 | fqs_duration = 0; | |
2205 | if (fqs_duration) { | |
628edaa5 | 2206 | /* Create the fqs thread */ |
d0d0606e PM |
2207 | firsterr = torture_create_kthread(rcu_torture_fqs, NULL, |
2208 | fqs_task); | |
47cf29b9 | 2209 | if (firsterr) |
bf66f18e | 2210 | goto unwind; |
bf66f18e | 2211 | } |
8e8be45e PM |
2212 | if (test_boost_interval < 1) |
2213 | test_boost_interval = 1; | |
2214 | if (test_boost_duration < 2) | |
2215 | test_boost_duration = 2; | |
4babd855 | 2216 | if (rcu_torture_can_boost()) { |
8e8be45e PM |
2217 | |
2218 | boost_starttime = jiffies + test_boost_interval * HZ; | |
0ffd374b SAS |
2219 | |
2220 | firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE", | |
2221 | rcutorture_booster_init, | |
2222 | rcutorture_booster_cleanup); | |
2223 | if (firsterr < 0) | |
2224 | goto unwind; | |
2225 | rcutor_hp = firsterr; | |
8e8be45e | 2226 | } |
01025ebc PM |
2227 | firsterr = torture_shutdown_init(shutdown_secs, rcu_torture_cleanup); |
2228 | if (firsterr) | |
37e377d2 | 2229 | goto unwind; |
028be12b | 2230 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval); |
01025ebc | 2231 | if (firsterr) |
37e377d2 | 2232 | goto unwind; |
01025ebc | 2233 | firsterr = rcu_torture_stall_init(); |
1b27291b PM |
2234 | if (firsterr) |
2235 | goto unwind; | |
2236 | firsterr = rcu_torture_fwd_prog_init(); | |
01025ebc | 2237 | if (firsterr) |
37e377d2 | 2238 | goto unwind; |
01025ebc PM |
2239 | firsterr = rcu_torture_barrier_init(); |
2240 | if (firsterr) | |
fae4b54f | 2241 | goto unwind; |
d2818df1 PM |
2242 | if (object_debug) |
2243 | rcu_test_debug_objects(); | |
38706bc5 PM |
2244 | if (cbflood_n_burst > 0) { |
2245 | /* Create the cbflood threads */ | |
2246 | ncbflooders = (num_online_cpus() + 3) / 4; | |
2247 | cbflood_task = kcalloc(ncbflooders, sizeof(*cbflood_task), | |
2248 | GFP_KERNEL); | |
2249 | if (!cbflood_task) { | |
2250 | VERBOSE_TOROUT_ERRSTRING("out of memory"); | |
2251 | firsterr = -ENOMEM; | |
2252 | goto unwind; | |
2253 | } | |
2254 | for (i = 0; i < ncbflooders; i++) { | |
2255 | firsterr = torture_create_kthread(rcu_torture_cbflood, | |
2256 | NULL, | |
2257 | cbflood_task[i]); | |
2258 | if (firsterr) | |
2259 | goto unwind; | |
2260 | } | |
2261 | } | |
b5daa8f3 | 2262 | torture_init_end(); |
a241ec65 PM |
2263 | return 0; |
2264 | ||
2265 | unwind: | |
b5daa8f3 | 2266 | torture_init_end(); |
a241ec65 PM |
2267 | rcu_torture_cleanup(); |
2268 | return firsterr; | |
2269 | } | |
2270 | ||
2271 | module_init(rcu_torture_init); | |
2272 | module_exit(rcu_torture_cleanup); |