1 // SPDX-License-Identifier: GPL-2.0+ <<
2 /* 1 /*
3 * Common functions for in-kernel torture test 2 * Common functions for in-kernel torture tests.
4 * 3 *
>> 4 * This program is free software; you can redistribute it and/or modify
>> 5 * it under the terms of the GNU General Public License as published by
>> 6 * the Free Software Foundation; either version 2 of the License, or
>> 7 * (at your option) any later version.
>> 8 *
>> 9 * This program is distributed in the hope that it will be useful,
>> 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 12 * GNU General Public License for more details.
>> 13 *
>> 14 * You should have received a copy of the GNU General Public License
>> 15 * along with this program; if not, you can access it online at
>> 16 * http://www.gnu.org/licenses/gpl-2.0.html.
>> 17 *
5 * Copyright (C) IBM Corporation, 2014 18 * Copyright (C) IBM Corporation, 2014
6 * 19 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm !! 20 * Author: Paul E. McKenney <paulmck@us.ibm.com>
8 * Based on kernel/rcu/torture.c. 21 * Based on kernel/rcu/torture.c.
9 */ 22 */
10 <<
11 #define pr_fmt(fmt) fmt <<
12 <<
13 #include <linux/types.h> 23 #include <linux/types.h>
14 #include <linux/kernel.h> 24 #include <linux/kernel.h>
15 #include <linux/init.h> 25 #include <linux/init.h>
16 #include <linux/module.h> 26 #include <linux/module.h>
17 #include <linux/kthread.h> 27 #include <linux/kthread.h>
18 #include <linux/err.h> 28 #include <linux/err.h>
19 #include <linux/spinlock.h> 29 #include <linux/spinlock.h>
20 #include <linux/smp.h> 30 #include <linux/smp.h>
21 #include <linux/interrupt.h> 31 #include <linux/interrupt.h>
22 #include <linux/sched.h> 32 #include <linux/sched.h>
23 #include <linux/sched/clock.h> 33 #include <linux/sched/clock.h>
24 #include <linux/atomic.h> 34 #include <linux/atomic.h>
25 #include <linux/bitops.h> 35 #include <linux/bitops.h>
26 #include <linux/completion.h> 36 #include <linux/completion.h>
27 #include <linux/moduleparam.h> 37 #include <linux/moduleparam.h>
28 #include <linux/percpu.h> 38 #include <linux/percpu.h>
29 #include <linux/notifier.h> 39 #include <linux/notifier.h>
30 #include <linux/reboot.h> 40 #include <linux/reboot.h>
31 #include <linux/freezer.h> 41 #include <linux/freezer.h>
32 #include <linux/cpu.h> 42 #include <linux/cpu.h>
33 #include <linux/delay.h> 43 #include <linux/delay.h>
34 #include <linux/stat.h> 44 #include <linux/stat.h>
35 #include <linux/slab.h> 45 #include <linux/slab.h>
36 #include <linux/trace_clock.h> 46 #include <linux/trace_clock.h>
37 #include <linux/ktime.h> 47 #include <linux/ktime.h>
38 #include <asm/byteorder.h> 48 #include <asm/byteorder.h>
39 #include <linux/torture.h> 49 #include <linux/torture.h>
40 #include <linux/sched/rt.h> <<
41 #include "rcu/rcu.h" <<
42 50
43 MODULE_DESCRIPTION("Common functions for in-ke <<
44 MODULE_LICENSE("GPL"); 51 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Paul E. McKenney <paulmck@linux !! 52 MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
46 <<
47 static bool disable_onoff_at_boot; <<
48 module_param(disable_onoff_at_boot, bool, 0444 <<
49 <<
50 static bool ftrace_dump_at_shutdown; <<
51 module_param(ftrace_dump_at_shutdown, bool, 04 <<
52 <<
53 static int verbose_sleep_frequency; <<
54 module_param(verbose_sleep_frequency, int, 044 <<
55 <<
56 static int verbose_sleep_duration = 1; <<
57 module_param(verbose_sleep_duration, int, 0444 <<
58 <<
59 static int random_shuffle; <<
60 module_param(random_shuffle, int, 0444); <<
61 53
62 static char *torture_type; 54 static char *torture_type;
63 static int verbose; !! 55 static bool verbose;
64 56
65 /* Mediate rmmod and system shutdown. Concurr 57 /* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */
66 #define FULLSTOP_DONTSTOP 0 /* Normal oper 58 #define FULLSTOP_DONTSTOP 0 /* Normal operation. */
67 #define FULLSTOP_SHUTDOWN 1 /* System shut 59 #define FULLSTOP_SHUTDOWN 1 /* System shutdown with torture running. */
68 #define FULLSTOP_RMMOD 2 /* Normal rmmo 60 #define FULLSTOP_RMMOD 2 /* Normal rmmod of torture. */
69 static int fullstop = FULLSTOP_RMMOD; 61 static int fullstop = FULLSTOP_RMMOD;
70 static DEFINE_MUTEX(fullstop_mutex); 62 static DEFINE_MUTEX(fullstop_mutex);
71 !! 63 static int *torture_runnable;
72 static atomic_t verbose_sleep_counter; <<
73 <<
74 /* <<
75 * Sleep if needed from VERBOSE_TOROUT*(). <<
76 */ <<
77 void verbose_torout_sleep(void) <<
78 { <<
79 if (verbose_sleep_frequency > 0 && <<
80 verbose_sleep_duration > 0 && <<
81 !(atomic_inc_return(&verbose_sleep <<
82 schedule_timeout_uninterruptib <<
83 } <<
84 EXPORT_SYMBOL_GPL(verbose_torout_sleep); <<
85 <<
86 /* <<
87 * Schedule a high-resolution-timer sleep in n <<
88 * nanosecond random fuzz. This function and <<
89 * testing from the timer wheel. <<
90 */ <<
91 int torture_hrtimeout_ns(ktime_t baset_ns, u32 <<
92 struct torture_random <<
93 { <<
94 ktime_t hto = baset_ns; <<
95 <<
96 if (trsp) <<
97 hto += torture_random(trsp) % <<
98 set_current_state(TASK_IDLE); <<
99 return schedule_hrtimeout(&hto, mode); <<
100 } <<
101 EXPORT_SYMBOL_GPL(torture_hrtimeout_ns); <<
102 <<
103 /* <<
104 * Schedule a high-resolution-timer sleep in m <<
105 * nanosecond (not microsecond!) random fuzz. <<
106 */ <<
107 int torture_hrtimeout_us(u32 baset_us, u32 fuz <<
108 { <<
109 ktime_t baset_ns = baset_us * NSEC_PER <<
110 <<
111 return torture_hrtimeout_ns(baset_ns, <<
112 } <<
113 EXPORT_SYMBOL_GPL(torture_hrtimeout_us); <<
114 <<
115 /* <<
116 * Schedule a high-resolution-timer sleep in m <<
117 * microsecond (not millisecond!) random fuzz. <<
118 */ <<
119 int torture_hrtimeout_ms(u32 baset_ms, u32 fuz <<
120 { <<
121 ktime_t baset_ns = baset_ms * NSEC_PER <<
122 u32 fuzzt_ns; <<
123 <<
124 if ((u32)~0U / NSEC_PER_USEC < fuzzt_u <<
125 fuzzt_ns = (u32)~0U; <<
126 else <<
127 fuzzt_ns = fuzzt_us * NSEC_PER <<
128 return torture_hrtimeout_ns(baset_ns, <<
129 } <<
130 EXPORT_SYMBOL_GPL(torture_hrtimeout_ms); <<
131 <<
132 /* <<
133 * Schedule a high-resolution-timer sleep in j <<
134 * implied one-jiffy random fuzz. This is int <<
135 * schedule_timeout_interruptible() and friend <<
136 */ <<
137 int torture_hrtimeout_jiffies(u32 baset_j, str <<
138 { <<
139 ktime_t baset_ns = jiffies_to_nsecs(ba <<
140 <<
141 return torture_hrtimeout_ns(baset_ns, <<
142 } <<
143 EXPORT_SYMBOL_GPL(torture_hrtimeout_jiffies); <<
144 <<
145 /* <<
146 * Schedule a high-resolution-timer sleep in m <<
147 * millisecond (not second!) random fuzz. <<
148 */ <<
149 int torture_hrtimeout_s(u32 baset_s, u32 fuzzt <<
150 { <<
151 ktime_t baset_ns = baset_s * NSEC_PER_ <<
152 u32 fuzzt_ns; <<
153 <<
154 if ((u32)~0U / NSEC_PER_MSEC < fuzzt_m <<
155 fuzzt_ns = (u32)~0U; <<
156 else <<
157 fuzzt_ns = fuzzt_ms * NSEC_PER <<
158 return torture_hrtimeout_ns(baset_ns, <<
159 } <<
160 EXPORT_SYMBOL_GPL(torture_hrtimeout_s); <<
161 64
162 #ifdef CONFIG_HOTPLUG_CPU 65 #ifdef CONFIG_HOTPLUG_CPU
163 66
164 /* 67 /*
165 * Variables for online-offline handling. Onl 68 * Variables for online-offline handling. Only present if CPU hotplug
166 * is enabled, otherwise does nothing. 69 * is enabled, otherwise does nothing.
167 */ 70 */
168 71
169 static struct task_struct *onoff_task; 72 static struct task_struct *onoff_task;
170 static long onoff_holdoff; 73 static long onoff_holdoff;
171 static long onoff_interval; 74 static long onoff_interval;
172 static torture_ofl_func *onoff_f; <<
173 static long n_offline_attempts; 75 static long n_offline_attempts;
174 static long n_offline_successes; 76 static long n_offline_successes;
175 static unsigned long sum_offline; 77 static unsigned long sum_offline;
176 static int min_offline = -1; 78 static int min_offline = -1;
177 static int max_offline; 79 static int max_offline;
178 static long n_online_attempts; 80 static long n_online_attempts;
179 static long n_online_successes; 81 static long n_online_successes;
180 static unsigned long sum_online; 82 static unsigned long sum_online;
181 static int min_online = -1; 83 static int min_online = -1;
182 static int max_online; 84 static int max_online;
183 85
184 static int torture_online_cpus = NR_CPUS; <<
185 <<
186 /* <<
187 * Some torture testing leverages confusion as <<
188 * CPUs. This function returns the torture-te <<
189 * which allows torture tests to load-balance <<
190 */ <<
191 int torture_num_online_cpus(void) <<
192 { <<
193 return READ_ONCE(torture_online_cpus); <<
194 } <<
195 EXPORT_SYMBOL_GPL(torture_num_online_cpus); <<
196 <<
197 /* 86 /*
198 * Attempt to take a CPU offline. Return fals 87 * Attempt to take a CPU offline. Return false if the CPU is already
199 * offline or if it is not subject to CPU-hotp 88 * offline or if it is not subject to CPU-hotplug operations. The
200 * caller can detect other failures by looking 89 * caller can detect other failures by looking at the statistics.
201 */ 90 */
202 bool torture_offline(int cpu, long *n_offl_att 91 bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
203 unsigned long *sum_offl, 92 unsigned long *sum_offl, int *min_offl, int *max_offl)
204 { 93 {
205 unsigned long delta; 94 unsigned long delta;
206 int ret; 95 int ret;
207 char *s; <<
208 unsigned long starttime; 96 unsigned long starttime;
209 97
210 if (!cpu_online(cpu) || !cpu_is_hotplu 98 if (!cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
211 return false; 99 return false;
212 if (num_online_cpus() <= 1) <<
213 return false; /* Can't offlin <<
214 100
215 if (verbose > 1) !! 101 if (verbose)
216 pr_alert("%s" TORTURE_FLAG 102 pr_alert("%s" TORTURE_FLAG
217 "torture_onoff task: 103 "torture_onoff task: offlining %d\n",
218 torture_type, cpu); 104 torture_type, cpu);
219 starttime = jiffies; 105 starttime = jiffies;
220 (*n_offl_attempts)++; 106 (*n_offl_attempts)++;
221 ret = remove_cpu(cpu); !! 107 ret = cpu_down(cpu);
222 if (ret) { 108 if (ret) {
223 s = ""; <<
224 if (!rcu_inkernel_boot_has_end <<
225 // PCI probe frequentl <<
226 (*n_offl_attempts)--; <<
227 s = " (-EBUSY forgiven <<
228 } <<
229 if (verbose) 109 if (verbose)
230 pr_alert("%s" TORTURE_ 110 pr_alert("%s" TORTURE_FLAG
231 "torture_onof !! 111 "torture_onoff task: offline %d failed: errno %d\n",
232 torture_type, !! 112 torture_type, cpu, ret);
233 } else { 113 } else {
234 if (verbose > 1) !! 114 if (verbose)
235 pr_alert("%s" TORTURE_ 115 pr_alert("%s" TORTURE_FLAG
236 "torture_onof 116 "torture_onoff task: offlined %d\n",
237 torture_type, 117 torture_type, cpu);
238 if (onoff_f) <<
239 onoff_f(); <<
240 (*n_offl_successes)++; 118 (*n_offl_successes)++;
241 delta = jiffies - starttime; 119 delta = jiffies - starttime;
242 *sum_offl += delta; !! 120 sum_offl += delta;
243 if (*min_offl < 0) { 121 if (*min_offl < 0) {
244 *min_offl = delta; 122 *min_offl = delta;
245 *max_offl = delta; 123 *max_offl = delta;
246 } 124 }
247 if (*min_offl > delta) 125 if (*min_offl > delta)
248 *min_offl = delta; 126 *min_offl = delta;
249 if (*max_offl < delta) 127 if (*max_offl < delta)
250 *max_offl = delta; 128 *max_offl = delta;
251 WRITE_ONCE(torture_online_cpus <<
252 WARN_ON_ONCE(torture_online_cp <<
253 } 129 }
254 130
255 return true; 131 return true;
256 } 132 }
257 EXPORT_SYMBOL_GPL(torture_offline); 133 EXPORT_SYMBOL_GPL(torture_offline);
258 134
259 /* 135 /*
260 * Attempt to bring a CPU online. Return fals 136 * Attempt to bring a CPU online. Return false if the CPU is already
261 * online or if it is not subject to CPU-hotpl 137 * online or if it is not subject to CPU-hotplug operations. The
262 * caller can detect other failures by looking 138 * caller can detect other failures by looking at the statistics.
263 */ 139 */
264 bool torture_online(int cpu, long *n_onl_attem 140 bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
265 unsigned long *sum_onl, in 141 unsigned long *sum_onl, int *min_onl, int *max_onl)
266 { 142 {
267 unsigned long delta; 143 unsigned long delta;
268 int ret; 144 int ret;
269 char *s; <<
270 unsigned long starttime; 145 unsigned long starttime;
271 146
272 if (cpu_online(cpu) || !cpu_is_hotplug 147 if (cpu_online(cpu) || !cpu_is_hotpluggable(cpu))
273 return false; 148 return false;
274 149
275 if (verbose > 1) !! 150 if (verbose)
276 pr_alert("%s" TORTURE_FLAG 151 pr_alert("%s" TORTURE_FLAG
277 "torture_onoff task: 152 "torture_onoff task: onlining %d\n",
278 torture_type, cpu); 153 torture_type, cpu);
279 starttime = jiffies; 154 starttime = jiffies;
280 (*n_onl_attempts)++; 155 (*n_onl_attempts)++;
281 ret = add_cpu(cpu); !! 156 ret = cpu_up(cpu);
282 if (ret) { 157 if (ret) {
283 s = ""; <<
284 if (!rcu_inkernel_boot_has_end <<
285 // PCI probe frequentl <<
286 (*n_onl_attempts)--; <<
287 s = " (-EBUSY forgiven <<
288 } <<
289 if (verbose) 158 if (verbose)
290 pr_alert("%s" TORTURE_ 159 pr_alert("%s" TORTURE_FLAG
291 "torture_onof !! 160 "torture_onoff task: online %d failed: errno %d\n",
292 torture_type, !! 161 torture_type, cpu, ret);
293 } else { 162 } else {
294 if (verbose > 1) !! 163 if (verbose)
295 pr_alert("%s" TORTURE_ 164 pr_alert("%s" TORTURE_FLAG
296 "torture_onof 165 "torture_onoff task: onlined %d\n",
297 torture_type, 166 torture_type, cpu);
298 (*n_onl_successes)++; 167 (*n_onl_successes)++;
299 delta = jiffies - starttime; 168 delta = jiffies - starttime;
300 *sum_onl += delta; 169 *sum_onl += delta;
301 if (*min_onl < 0) { 170 if (*min_onl < 0) {
302 *min_onl = delta; 171 *min_onl = delta;
303 *max_onl = delta; 172 *max_onl = delta;
304 } 173 }
305 if (*min_onl > delta) 174 if (*min_onl > delta)
306 *min_onl = delta; 175 *min_onl = delta;
307 if (*max_onl < delta) 176 if (*max_onl < delta)
308 *max_onl = delta; 177 *max_onl = delta;
309 WRITE_ONCE(torture_online_cpus <<
310 } 178 }
311 179
312 return true; 180 return true;
313 } 181 }
314 EXPORT_SYMBOL_GPL(torture_online); 182 EXPORT_SYMBOL_GPL(torture_online);
315 183
316 /* 184 /*
317 * Get everything online at the beginning and <<
318 */ <<
319 static void torture_online_all(char *phase) <<
320 { <<
321 int cpu; <<
322 int ret; <<
323 <<
324 for_each_possible_cpu(cpu) { <<
325 if (cpu_online(cpu)) <<
326 continue; <<
327 ret = add_cpu(cpu); <<
328 if (ret && verbose) { <<
329 pr_alert("%s" TORTURE_ <<
330 "%s: %s onlin <<
331 __func__, pha <<
332 } <<
333 } <<
334 } <<
335 <<
336 /* <<
337 * Execute random CPU-hotplug operations at th 185 * Execute random CPU-hotplug operations at the interval specified
338 * by the onoff_interval. 186 * by the onoff_interval.
339 */ 187 */
340 static int 188 static int
341 torture_onoff(void *arg) 189 torture_onoff(void *arg)
342 { 190 {
343 int cpu; 191 int cpu;
344 int maxcpu = -1; 192 int maxcpu = -1;
345 DEFINE_TORTURE_RANDOM(rand); 193 DEFINE_TORTURE_RANDOM(rand);
346 194
347 VERBOSE_TOROUT_STRING("torture_onoff t 195 VERBOSE_TOROUT_STRING("torture_onoff task started");
348 for_each_online_cpu(cpu) 196 for_each_online_cpu(cpu)
349 maxcpu = cpu; 197 maxcpu = cpu;
350 WARN_ON(maxcpu < 0); 198 WARN_ON(maxcpu < 0);
351 torture_online_all("Initial"); !! 199
352 if (maxcpu == 0) { 200 if (maxcpu == 0) {
353 VERBOSE_TOROUT_STRING("Only on 201 VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
354 goto stop; 202 goto stop;
355 } 203 }
356 204
357 if (onoff_holdoff > 0) { 205 if (onoff_holdoff > 0) {
358 VERBOSE_TOROUT_STRING("torture 206 VERBOSE_TOROUT_STRING("torture_onoff begin holdoff");
359 torture_hrtimeout_jiffies(onof !! 207 schedule_timeout_interruptible(onoff_holdoff);
360 VERBOSE_TOROUT_STRING("torture 208 VERBOSE_TOROUT_STRING("torture_onoff end holdoff");
361 } 209 }
362 while (!torture_must_stop()) { 210 while (!torture_must_stop()) {
363 if (disable_onoff_at_boot && ! !! 211 cpu = (torture_random(&rand) >> 4) % (maxcpu + 1);
364 torture_hrtimeout_jiff <<
365 continue; <<
366 } <<
367 cpu = torture_random(&rand) % <<
368 if (!torture_offline(cpu, 212 if (!torture_offline(cpu,
369 &n_offlin 213 &n_offline_attempts, &n_offline_successes,
370 &sum_offl 214 &sum_offline, &min_offline, &max_offline))
371 torture_online(cpu, 215 torture_online(cpu,
372 &n_onli 216 &n_online_attempts, &n_online_successes,
373 &sum_on 217 &sum_online, &min_online, &max_online);
374 torture_hrtimeout_jiffies(onof !! 218 schedule_timeout_interruptible(onoff_interval);
375 } 219 }
376 220
377 stop: 221 stop:
378 torture_kthread_stopping("torture_onof 222 torture_kthread_stopping("torture_onoff");
379 torture_online_all("Final"); <<
380 return 0; 223 return 0;
381 } 224 }
382 225
383 #endif /* #ifdef CONFIG_HOTPLUG_CPU */ 226 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
384 227
385 /* 228 /*
386 * Initiate online-offline handling. 229 * Initiate online-offline handling.
387 */ 230 */
388 int torture_onoff_init(long ooholdoff, long oo !! 231 int torture_onoff_init(long ooholdoff, long oointerval)
389 { 232 {
>> 233 int ret = 0;
>> 234
390 #ifdef CONFIG_HOTPLUG_CPU 235 #ifdef CONFIG_HOTPLUG_CPU
391 onoff_holdoff = ooholdoff; 236 onoff_holdoff = ooholdoff;
392 onoff_interval = oointerval; 237 onoff_interval = oointerval;
393 onoff_f = f; <<
394 if (onoff_interval <= 0) 238 if (onoff_interval <= 0)
395 return 0; 239 return 0;
396 return torture_create_kthread(torture_ !! 240 ret = torture_create_kthread(torture_onoff, NULL, onoff_task);
397 #else /* #ifdef CONFIG_HOTPLUG_CPU */ !! 241 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
398 return 0; !! 242 return ret;
399 #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ <<
400 } 243 }
401 EXPORT_SYMBOL_GPL(torture_onoff_init); 244 EXPORT_SYMBOL_GPL(torture_onoff_init);
402 245
403 /* 246 /*
404 * Clean up after online/offline testing. 247 * Clean up after online/offline testing.
405 */ 248 */
406 static void torture_onoff_cleanup(void) 249 static void torture_onoff_cleanup(void)
407 { 250 {
408 #ifdef CONFIG_HOTPLUG_CPU 251 #ifdef CONFIG_HOTPLUG_CPU
409 if (onoff_task == NULL) 252 if (onoff_task == NULL)
410 return; 253 return;
411 VERBOSE_TOROUT_STRING("Stopping tortur 254 VERBOSE_TOROUT_STRING("Stopping torture_onoff task");
412 kthread_stop(onoff_task); 255 kthread_stop(onoff_task);
413 onoff_task = NULL; 256 onoff_task = NULL;
414 #endif /* #ifdef CONFIG_HOTPLUG_CPU */ 257 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
415 } 258 }
>> 259 EXPORT_SYMBOL_GPL(torture_onoff_cleanup);
416 260
417 /* 261 /*
418 * Print online/offline testing statistics. 262 * Print online/offline testing statistics.
419 */ 263 */
420 void torture_onoff_stats(void) 264 void torture_onoff_stats(void)
421 { 265 {
422 #ifdef CONFIG_HOTPLUG_CPU 266 #ifdef CONFIG_HOTPLUG_CPU
423 pr_cont("onoff: %ld/%ld:%ld/%ld %d,%d: 267 pr_cont("onoff: %ld/%ld:%ld/%ld %d,%d:%d,%d %lu:%lu (HZ=%d) ",
424 n_online_successes, n_online_a 268 n_online_successes, n_online_attempts,
425 n_offline_successes, n_offline 269 n_offline_successes, n_offline_attempts,
426 min_online, max_online, 270 min_online, max_online,
427 min_offline, max_offline, 271 min_offline, max_offline,
428 sum_online, sum_offline, HZ); 272 sum_online, sum_offline, HZ);
429 #endif /* #ifdef CONFIG_HOTPLUG_CPU */ 273 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
430 } 274 }
431 EXPORT_SYMBOL_GPL(torture_onoff_stats); 275 EXPORT_SYMBOL_GPL(torture_onoff_stats);
432 276
433 /* 277 /*
434 * Were all the online/offline operations succ 278 * Were all the online/offline operations successful?
435 */ 279 */
436 bool torture_onoff_failures(void) 280 bool torture_onoff_failures(void)
437 { 281 {
438 #ifdef CONFIG_HOTPLUG_CPU 282 #ifdef CONFIG_HOTPLUG_CPU
439 return n_online_successes != n_online_ 283 return n_online_successes != n_online_attempts ||
440 n_offline_successes != n_offlin 284 n_offline_successes != n_offline_attempts;
441 #else /* #ifdef CONFIG_HOTPLUG_CPU */ 285 #else /* #ifdef CONFIG_HOTPLUG_CPU */
442 return false; 286 return false;
443 #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ 287 #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
444 } 288 }
445 EXPORT_SYMBOL_GPL(torture_onoff_failures); 289 EXPORT_SYMBOL_GPL(torture_onoff_failures);
446 290
447 #define TORTURE_RANDOM_MULT 39916801 /* p 291 #define TORTURE_RANDOM_MULT 39916801 /* prime */
448 #define TORTURE_RANDOM_ADD 479001701 /* p 292 #define TORTURE_RANDOM_ADD 479001701 /* prime */
449 #define TORTURE_RANDOM_REFRESH 10000 293 #define TORTURE_RANDOM_REFRESH 10000
450 294
451 /* 295 /*
452 * Crude but fast random-number generator. Us 296 * Crude but fast random-number generator. Uses a linear congruential
453 * generator, with occasional help from cpu_cl 297 * generator, with occasional help from cpu_clock().
454 */ 298 */
455 unsigned long 299 unsigned long
456 torture_random(struct torture_random_state *tr 300 torture_random(struct torture_random_state *trsp)
457 { 301 {
458 if (--trsp->trs_count < 0) { 302 if (--trsp->trs_count < 0) {
459 trsp->trs_state += (unsigned l !! 303 trsp->trs_state += (unsigned long)local_clock();
460 trsp->trs_count = TORTURE_RAND 304 trsp->trs_count = TORTURE_RANDOM_REFRESH;
461 } 305 }
462 trsp->trs_state = trsp->trs_state * TO 306 trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
463 TORTURE_RANDOM_ADD; 307 TORTURE_RANDOM_ADD;
464 return swahw32(trsp->trs_state); 308 return swahw32(trsp->trs_state);
465 } 309 }
466 EXPORT_SYMBOL_GPL(torture_random); 310 EXPORT_SYMBOL_GPL(torture_random);
467 311
468 /* 312 /*
469 * Variables for shuffling. The idea is to en 313 * Variables for shuffling. The idea is to ensure that each CPU stays
470 * idle for an extended period to test interac 314 * idle for an extended period to test interactions with dyntick idle,
471 * as well as interactions with any per-CPU va 315 * as well as interactions with any per-CPU variables.
472 */ 316 */
473 struct shuffle_task { 317 struct shuffle_task {
474 struct list_head st_l; 318 struct list_head st_l;
475 struct task_struct *st_t; 319 struct task_struct *st_t;
476 }; 320 };
477 321
478 static long shuffle_interval; /* In jiffies. 322 static long shuffle_interval; /* In jiffies. */
479 static struct task_struct *shuffler_task; 323 static struct task_struct *shuffler_task;
480 static cpumask_var_t shuffle_tmp_mask; 324 static cpumask_var_t shuffle_tmp_mask;
481 static int shuffle_idle_cpu; /* Force all t 325 static int shuffle_idle_cpu; /* Force all torture tasks off this CPU */
482 static struct list_head shuffle_task_list = LI 326 static struct list_head shuffle_task_list = LIST_HEAD_INIT(shuffle_task_list);
483 static DEFINE_MUTEX(shuffle_task_mutex); 327 static DEFINE_MUTEX(shuffle_task_mutex);
484 328
485 /* 329 /*
486 * Register a task to be shuffled. If there i 330 * Register a task to be shuffled. If there is no memory, just splat
487 * and don't bother registering. 331 * and don't bother registering.
488 */ 332 */
489 void torture_shuffle_task_register(struct task 333 void torture_shuffle_task_register(struct task_struct *tp)
490 { 334 {
491 struct shuffle_task *stp; 335 struct shuffle_task *stp;
492 336
493 if (WARN_ON_ONCE(tp == NULL)) 337 if (WARN_ON_ONCE(tp == NULL))
494 return; 338 return;
495 stp = kmalloc(sizeof(*stp), GFP_KERNEL 339 stp = kmalloc(sizeof(*stp), GFP_KERNEL);
496 if (WARN_ON_ONCE(stp == NULL)) 340 if (WARN_ON_ONCE(stp == NULL))
497 return; 341 return;
498 stp->st_t = tp; 342 stp->st_t = tp;
499 mutex_lock(&shuffle_task_mutex); 343 mutex_lock(&shuffle_task_mutex);
500 list_add(&stp->st_l, &shuffle_task_lis 344 list_add(&stp->st_l, &shuffle_task_list);
501 mutex_unlock(&shuffle_task_mutex); 345 mutex_unlock(&shuffle_task_mutex);
502 } 346 }
503 EXPORT_SYMBOL_GPL(torture_shuffle_task_registe 347 EXPORT_SYMBOL_GPL(torture_shuffle_task_register);
504 348
505 /* 349 /*
506 * Unregister all tasks, for example, at the e 350 * Unregister all tasks, for example, at the end of the torture run.
507 */ 351 */
508 static void torture_shuffle_task_unregister_al 352 static void torture_shuffle_task_unregister_all(void)
509 { 353 {
510 struct shuffle_task *stp; 354 struct shuffle_task *stp;
511 struct shuffle_task *p; 355 struct shuffle_task *p;
512 356
513 mutex_lock(&shuffle_task_mutex); 357 mutex_lock(&shuffle_task_mutex);
514 list_for_each_entry_safe(stp, p, &shuf 358 list_for_each_entry_safe(stp, p, &shuffle_task_list, st_l) {
515 list_del(&stp->st_l); 359 list_del(&stp->st_l);
516 kfree(stp); 360 kfree(stp);
517 } 361 }
518 mutex_unlock(&shuffle_task_mutex); 362 mutex_unlock(&shuffle_task_mutex);
519 } 363 }
520 364
521 /* Shuffle tasks such that we allow shuffle_id 365 /* Shuffle tasks such that we allow shuffle_idle_cpu to become idle.
522 * A special case is when shuffle_idle_cpu = - 366 * A special case is when shuffle_idle_cpu = -1, in which case we allow
523 * the tasks to run on all CPUs. 367 * the tasks to run on all CPUs.
524 */ 368 */
525 static void torture_shuffle_tasks(struct tortu !! 369 static void torture_shuffle_tasks(void)
526 { 370 {
527 struct shuffle_task *stp; 371 struct shuffle_task *stp;
528 372
529 cpumask_setall(shuffle_tmp_mask); 373 cpumask_setall(shuffle_tmp_mask);
530 cpus_read_lock(); !! 374 get_online_cpus();
531 375
532 /* No point in shuffling if there is o 376 /* No point in shuffling if there is only one online CPU (ex: UP) */
533 if (num_online_cpus() == 1) { 377 if (num_online_cpus() == 1) {
534 cpus_read_unlock(); !! 378 put_online_cpus();
535 return; 379 return;
536 } 380 }
537 381
538 /* Advance to the next CPU. Upon over 382 /* Advance to the next CPU. Upon overflow, don't idle any CPUs. */
539 shuffle_idle_cpu = cpumask_next(shuffl 383 shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask);
540 if (shuffle_idle_cpu >= nr_cpu_ids) 384 if (shuffle_idle_cpu >= nr_cpu_ids)
541 shuffle_idle_cpu = -1; 385 shuffle_idle_cpu = -1;
542 else 386 else
543 cpumask_clear_cpu(shuffle_idle 387 cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask);
544 388
545 mutex_lock(&shuffle_task_mutex); 389 mutex_lock(&shuffle_task_mutex);
546 list_for_each_entry(stp, &shuffle_task !! 390 list_for_each_entry(stp, &shuffle_task_list, st_l)
547 if (!random_shuffle || torture !! 391 set_cpus_allowed_ptr(stp->st_t, shuffle_tmp_mask);
548 set_cpus_allowed_ptr(s <<
549 } <<
550 mutex_unlock(&shuffle_task_mutex); 392 mutex_unlock(&shuffle_task_mutex);
551 393
552 cpus_read_unlock(); !! 394 put_online_cpus();
553 } 395 }
554 396
555 /* Shuffle tasks across CPUs, with the intent 397 /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the
556 * system to become idle at a time and cut off 398 * system to become idle at a time and cut off its timer ticks. This is meant
557 * to test the support for such tickless idle 399 * to test the support for such tickless idle CPU in RCU.
558 */ 400 */
559 static int torture_shuffle(void *arg) 401 static int torture_shuffle(void *arg)
560 { 402 {
561 DEFINE_TORTURE_RANDOM(rand); <<
562 <<
563 VERBOSE_TOROUT_STRING("torture_shuffle 403 VERBOSE_TOROUT_STRING("torture_shuffle task started");
564 do { 404 do {
565 torture_hrtimeout_jiffies(shuf !! 405 schedule_timeout_interruptible(shuffle_interval);
566 torture_shuffle_tasks(&rand); !! 406 torture_shuffle_tasks();
567 torture_shutdown_absorb("tortu 407 torture_shutdown_absorb("torture_shuffle");
568 } while (!torture_must_stop()); 408 } while (!torture_must_stop());
569 torture_kthread_stopping("torture_shuf 409 torture_kthread_stopping("torture_shuffle");
570 return 0; 410 return 0;
571 } 411 }
572 412
573 /* 413 /*
574 * Start the shuffler, with shuffint in jiffie 414 * Start the shuffler, with shuffint in jiffies.
575 */ 415 */
576 int torture_shuffle_init(long shuffint) 416 int torture_shuffle_init(long shuffint)
577 { 417 {
578 shuffle_interval = shuffint; 418 shuffle_interval = shuffint;
579 419
580 shuffle_idle_cpu = -1; 420 shuffle_idle_cpu = -1;
581 421
582 if (!alloc_cpumask_var(&shuffle_tmp_ma 422 if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) {
583 TOROUT_ERRSTRING("Failed to al !! 423 VERBOSE_TOROUT_ERRSTRING("Failed to alloc mask");
584 return -ENOMEM; 424 return -ENOMEM;
585 } 425 }
586 426
587 /* Create the shuffler thread */ 427 /* Create the shuffler thread */
588 return torture_create_kthread(torture_ 428 return torture_create_kthread(torture_shuffle, NULL, shuffler_task);
589 } 429 }
590 EXPORT_SYMBOL_GPL(torture_shuffle_init); 430 EXPORT_SYMBOL_GPL(torture_shuffle_init);
591 431
592 /* 432 /*
593 * Stop the shuffling. 433 * Stop the shuffling.
594 */ 434 */
595 static void torture_shuffle_cleanup(void) 435 static void torture_shuffle_cleanup(void)
596 { 436 {
597 torture_shuffle_task_unregister_all(); 437 torture_shuffle_task_unregister_all();
598 if (shuffler_task) { 438 if (shuffler_task) {
599 VERBOSE_TOROUT_STRING("Stoppin 439 VERBOSE_TOROUT_STRING("Stopping torture_shuffle task");
600 kthread_stop(shuffler_task); 440 kthread_stop(shuffler_task);
601 free_cpumask_var(shuffle_tmp_m 441 free_cpumask_var(shuffle_tmp_mask);
602 } 442 }
603 shuffler_task = NULL; 443 shuffler_task = NULL;
604 } 444 }
>> 445 EXPORT_SYMBOL_GPL(torture_shuffle_cleanup);
605 446
606 /* 447 /*
607 * Variables for auto-shutdown. This allows " 448 * Variables for auto-shutdown. This allows "lights out" torture runs
608 * to be fully scripted. 449 * to be fully scripted.
609 */ 450 */
610 static struct task_struct *shutdown_task; 451 static struct task_struct *shutdown_task;
611 static ktime_t shutdown_time; /* tim 452 static ktime_t shutdown_time; /* time to system shutdown. */
612 static void (*torture_shutdown_hook)(void); 453 static void (*torture_shutdown_hook)(void);
613 454
614 /* 455 /*
615 * Absorb kthreads into a kernel function that 456 * Absorb kthreads into a kernel function that won't return, so that
616 * they won't ever access module text or data 457 * they won't ever access module text or data again.
617 */ 458 */
618 void torture_shutdown_absorb(const char *title 459 void torture_shutdown_absorb(const char *title)
619 { 460 {
620 while (READ_ONCE(fullstop) == FULLSTOP 461 while (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
621 pr_notice("torture thread %s p 462 pr_notice("torture thread %s parking due to system shutdown\n",
622 title); 463 title);
623 schedule_timeout_uninterruptib 464 schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
624 } 465 }
625 } 466 }
626 EXPORT_SYMBOL_GPL(torture_shutdown_absorb); 467 EXPORT_SYMBOL_GPL(torture_shutdown_absorb);
627 468
628 /* 469 /*
629 * Cause the torture test to shutdown the syst 470 * Cause the torture test to shutdown the system after the test has
630 * run for the time specified by the shutdown_ 471 * run for the time specified by the shutdown_secs parameter.
631 */ 472 */
632 static int torture_shutdown(void *arg) 473 static int torture_shutdown(void *arg)
633 { 474 {
634 ktime_t ktime_snap; 475 ktime_t ktime_snap;
635 476
636 VERBOSE_TOROUT_STRING("torture_shutdow 477 VERBOSE_TOROUT_STRING("torture_shutdown task started");
637 ktime_snap = ktime_get(); 478 ktime_snap = ktime_get();
638 while (ktime_before(ktime_snap, shutdo 479 while (ktime_before(ktime_snap, shutdown_time) &&
639 !torture_must_stop()) { 480 !torture_must_stop()) {
640 if (verbose) 481 if (verbose)
641 pr_alert("%s" TORTURE_ 482 pr_alert("%s" TORTURE_FLAG
642 "torture_shut 483 "torture_shutdown task: %llu ms remaining\n",
643 torture_type, 484 torture_type,
644 ktime_ms_delt 485 ktime_ms_delta(shutdown_time, ktime_snap));
645 set_current_state(TASK_INTERRU 486 set_current_state(TASK_INTERRUPTIBLE);
646 schedule_hrtimeout(&shutdown_t 487 schedule_hrtimeout(&shutdown_time, HRTIMER_MODE_ABS);
647 ktime_snap = ktime_get(); 488 ktime_snap = ktime_get();
648 } 489 }
649 if (torture_must_stop()) { 490 if (torture_must_stop()) {
650 torture_kthread_stopping("tort 491 torture_kthread_stopping("torture_shutdown");
651 return 0; 492 return 0;
652 } 493 }
653 494
654 /* OK, shut down the system. */ 495 /* OK, shut down the system. */
655 496
656 VERBOSE_TOROUT_STRING("torture_shutdow 497 VERBOSE_TOROUT_STRING("torture_shutdown task shutting down system");
657 shutdown_task = NULL; /* Avoid self- 498 shutdown_task = NULL; /* Avoid self-kill deadlock. */
658 if (torture_shutdown_hook) 499 if (torture_shutdown_hook)
659 torture_shutdown_hook(); 500 torture_shutdown_hook();
660 else 501 else
661 VERBOSE_TOROUT_STRING("No tort 502 VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping.");
662 if (ftrace_dump_at_shutdown) !! 503 ftrace_dump(DUMP_ALL);
663 rcu_ftrace_dump(DUMP_ALL); <<
664 kernel_power_off(); /* Shut down t 504 kernel_power_off(); /* Shut down the system. */
665 return 0; 505 return 0;
666 } 506 }
667 507
668 /* 508 /*
669 * Start up the shutdown task. 509 * Start up the shutdown task.
670 */ 510 */
671 int torture_shutdown_init(int ssecs, void (*cl 511 int torture_shutdown_init(int ssecs, void (*cleanup)(void))
672 { 512 {
>> 513 int ret = 0;
>> 514
673 torture_shutdown_hook = cleanup; 515 torture_shutdown_hook = cleanup;
674 if (ssecs > 0) { 516 if (ssecs > 0) {
675 shutdown_time = ktime_add(ktim 517 shutdown_time = ktime_add(ktime_get(), ktime_set(ssecs, 0));
676 return torture_create_kthread( !! 518 ret = torture_create_kthread(torture_shutdown, NULL,
677 !! 519 shutdown_task);
678 } 520 }
679 return 0; !! 521 return ret;
680 } 522 }
681 EXPORT_SYMBOL_GPL(torture_shutdown_init); 523 EXPORT_SYMBOL_GPL(torture_shutdown_init);
682 524
683 /* 525 /*
684 * Detect and respond to a system shutdown. 526 * Detect and respond to a system shutdown.
685 */ 527 */
686 static int torture_shutdown_notify(struct noti 528 static int torture_shutdown_notify(struct notifier_block *unused1,
687 unsigned lo 529 unsigned long unused2, void *unused3)
688 { 530 {
689 mutex_lock(&fullstop_mutex); 531 mutex_lock(&fullstop_mutex);
690 if (READ_ONCE(fullstop) == FULLSTOP_DO 532 if (READ_ONCE(fullstop) == FULLSTOP_DONTSTOP) {
691 VERBOSE_TOROUT_STRING("Unsched 533 VERBOSE_TOROUT_STRING("Unscheduled system shutdown detected");
692 WRITE_ONCE(fullstop, FULLSTOP_ 534 WRITE_ONCE(fullstop, FULLSTOP_SHUTDOWN);
693 } else { 535 } else {
694 pr_warn("Concurrent rmmod and 536 pr_warn("Concurrent rmmod and shutdown illegal!\n");
695 } 537 }
696 mutex_unlock(&fullstop_mutex); 538 mutex_unlock(&fullstop_mutex);
697 return NOTIFY_DONE; 539 return NOTIFY_DONE;
698 } 540 }
699 541
700 static struct notifier_block torture_shutdown_ 542 static struct notifier_block torture_shutdown_nb = {
701 .notifier_call = torture_shutdown_noti 543 .notifier_call = torture_shutdown_notify,
702 }; 544 };
703 545
704 /* 546 /*
705 * Shut down the shutdown task. Say what??? 547 * Shut down the shutdown task. Say what??? Heh! This can happen if
706 * the torture module gets an rmmod before the 548 * the torture module gets an rmmod before the shutdown time arrives. ;-)
707 */ 549 */
708 static void torture_shutdown_cleanup(void) 550 static void torture_shutdown_cleanup(void)
709 { 551 {
710 unregister_reboot_notifier(&torture_sh 552 unregister_reboot_notifier(&torture_shutdown_nb);
711 if (shutdown_task != NULL) { 553 if (shutdown_task != NULL) {
712 VERBOSE_TOROUT_STRING("Stoppin 554 VERBOSE_TOROUT_STRING("Stopping torture_shutdown task");
713 kthread_stop(shutdown_task); 555 kthread_stop(shutdown_task);
714 } 556 }
715 shutdown_task = NULL; 557 shutdown_task = NULL;
716 } 558 }
717 559
718 /* 560 /*
719 * Variables for stuttering, which means to pe 561 * Variables for stuttering, which means to periodically pause and
720 * restart testing in order to catch bugs that 562 * restart testing in order to catch bugs that appear when load is
721 * suddenly applied to or removed from the sys 563 * suddenly applied to or removed from the system.
722 */ 564 */
723 static struct task_struct *stutter_task; 565 static struct task_struct *stutter_task;
724 static ktime_t stutter_till_abs_time; !! 566 static int stutter_pause_test;
725 static int stutter; 567 static int stutter;
726 static int stutter_gap; <<
727 568
728 /* 569 /*
729 * Block until the stutter interval ends. Thi 570 * Block until the stutter interval ends. This must be called periodically
730 * by all running kthreads that need to be sub 571 * by all running kthreads that need to be subject to stuttering.
731 */ 572 */
732 bool stutter_wait(const char *title) !! 573 void stutter_wait(const char *title)
733 { 574 {
734 bool ret = false; !! 575 cond_resched_rcu_qs();
735 ktime_t till_ns; !! 576 while (READ_ONCE(stutter_pause_test) ||
736 !! 577 (torture_runnable && !READ_ONCE(*torture_runnable))) {
737 cond_resched_tasks_rcu_qs(); !! 578 if (stutter_pause_test)
738 till_ns = READ_ONCE(stutter_till_abs_t !! 579 if (READ_ONCE(stutter_pause_test) == 1)
739 if (till_ns && ktime_before(ktime_get( !! 580 schedule_timeout_interruptible(1);
740 torture_hrtimeout_ns(till_ns, !! 581 else
741 ret = true; !! 582 while (READ_ONCE(stutter_pause_test))
>> 583 cond_resched();
>> 584 else
>> 585 schedule_timeout_interruptible(round_jiffies_relative(HZ));
>> 586 torture_shutdown_absorb(title);
742 } 587 }
743 torture_shutdown_absorb(title); <<
744 return ret; <<
745 } 588 }
746 EXPORT_SYMBOL_GPL(stutter_wait); 589 EXPORT_SYMBOL_GPL(stutter_wait);
747 590
748 /* 591 /*
749 * Cause the torture test to "stutter", starti 592 * Cause the torture test to "stutter", starting and stopping all
750 * threads periodically. 593 * threads periodically.
751 */ 594 */
752 static int torture_stutter(void *arg) 595 static int torture_stutter(void *arg)
753 { 596 {
754 ktime_t till_ns; <<
755 <<
756 VERBOSE_TOROUT_STRING("torture_stutter 597 VERBOSE_TOROUT_STRING("torture_stutter task started");
757 do { 598 do {
758 if (!torture_must_stop() && st !! 599 if (!torture_must_stop()) {
759 till_ns = ktime_add_ns !! 600 if (stutter > 1) {
760 !! 601 schedule_timeout_interruptible(stutter - 1);
761 WRITE_ONCE(stutter_til !! 602 WRITE_ONCE(stutter_pause_test, 2);
762 torture_hrtimeout_jiff !! 603 }
>> 604 schedule_timeout_interruptible(1);
>> 605 WRITE_ONCE(stutter_pause_test, 1);
763 } 606 }
764 if (!torture_must_stop()) 607 if (!torture_must_stop())
765 torture_hrtimeout_jiff !! 608 schedule_timeout_interruptible(stutter);
>> 609 WRITE_ONCE(stutter_pause_test, 0);
766 torture_shutdown_absorb("tortu 610 torture_shutdown_absorb("torture_stutter");
767 } while (!torture_must_stop()); 611 } while (!torture_must_stop());
768 torture_kthread_stopping("torture_stut 612 torture_kthread_stopping("torture_stutter");
769 return 0; 613 return 0;
770 } 614 }
771 615
772 /* 616 /*
773 * Initialize and kick off the torture_stutter 617 * Initialize and kick off the torture_stutter kthread.
774 */ 618 */
775 int torture_stutter_init(const int s, const in !! 619 int torture_stutter_init(int s)
776 { 620 {
>> 621 int ret;
>> 622
777 stutter = s; 623 stutter = s;
778 stutter_gap = sgap; !! 624 ret = torture_create_kthread(torture_stutter, NULL, stutter_task);
779 return torture_create_kthread(torture_ !! 625 return ret;
780 } 626 }
781 EXPORT_SYMBOL_GPL(torture_stutter_init); 627 EXPORT_SYMBOL_GPL(torture_stutter_init);
782 628
783 /* 629 /*
784 * Cleanup after the torture_stutter kthread. 630 * Cleanup after the torture_stutter kthread.
785 */ 631 */
786 static void torture_stutter_cleanup(void) 632 static void torture_stutter_cleanup(void)
787 { 633 {
788 if (!stutter_task) 634 if (!stutter_task)
789 return; 635 return;
790 VERBOSE_TOROUT_STRING("Stopping tortur 636 VERBOSE_TOROUT_STRING("Stopping torture_stutter task");
791 kthread_stop(stutter_task); 637 kthread_stop(stutter_task);
792 stutter_task = NULL; 638 stutter_task = NULL;
793 } 639 }
794 640
795 static void <<
796 torture_print_module_parms(void) <<
797 { <<
798 pr_alert("torture module --- %s: disa <<
799 torture_type, disable_onoff_a <<
800 } <<
801 <<
802 /* 641 /*
803 * Initialize torture module. Please note tha 642 * Initialize torture module. Please note that this is -not- invoked via
804 * the usual module_init() mechanism, but rath 643 * the usual module_init() mechanism, but rather by an explicit call from
805 * the client torture module. This call must 644 * the client torture module. This call must be paired with a later
806 * torture_init_end(). 645 * torture_init_end().
807 * 646 *
808 * The runnable parameter points to a flag tha 647 * The runnable parameter points to a flag that controls whether or not
809 * the test is currently runnable. If there i 648 * the test is currently runnable. If there is no such flag, pass in NULL.
810 */ 649 */
811 bool torture_init_begin(char *ttype, int v) !! 650 bool torture_init_begin(char *ttype, bool v, int *runnable)
812 { 651 {
813 mutex_lock(&fullstop_mutex); 652 mutex_lock(&fullstop_mutex);
814 if (torture_type != NULL) { 653 if (torture_type != NULL) {
815 pr_alert("%s: Refusing %s init !! 654 pr_alert("torture_init_begin: Refusing %s init: %s running.\n",
816 __func__, ttype, tor !! 655 ttype, torture_type);
817 pr_alert("%s: One torture test !! 656 pr_alert("torture_init_begin: One torture test at a time!\n");
818 mutex_unlock(&fullstop_mutex); 657 mutex_unlock(&fullstop_mutex);
819 return false; 658 return false;
820 } 659 }
821 torture_type = ttype; 660 torture_type = ttype;
822 verbose = v; 661 verbose = v;
>> 662 torture_runnable = runnable;
823 fullstop = FULLSTOP_DONTSTOP; 663 fullstop = FULLSTOP_DONTSTOP;
824 torture_print_module_parms(); <<
825 return true; 664 return true;
826 } 665 }
827 EXPORT_SYMBOL_GPL(torture_init_begin); 666 EXPORT_SYMBOL_GPL(torture_init_begin);
828 667
829 /* 668 /*
830 * Tell the torture module that initialization 669 * Tell the torture module that initialization is complete.
831 */ 670 */
832 void torture_init_end(void) 671 void torture_init_end(void)
833 { 672 {
834 mutex_unlock(&fullstop_mutex); 673 mutex_unlock(&fullstop_mutex);
835 register_reboot_notifier(&torture_shut 674 register_reboot_notifier(&torture_shutdown_nb);
836 } 675 }
837 EXPORT_SYMBOL_GPL(torture_init_end); 676 EXPORT_SYMBOL_GPL(torture_init_end);
838 677
839 /* 678 /*
840 * Clean up torture module. Please note that 679 * Clean up torture module. Please note that this is -not- invoked via
841 * the usual module_exit() mechanism, but rath 680 * the usual module_exit() mechanism, but rather by an explicit call from
842 * the client torture module. Returns true if 681 * the client torture module. Returns true if a race with system shutdown
843 * is detected, otherwise, all kthreads starte 682 * is detected, otherwise, all kthreads started by functions in this file
844 * will be shut down. 683 * will be shut down.
845 * 684 *
846 * This must be called before the caller start 685 * This must be called before the caller starts shutting down its own
847 * kthreads. 686 * kthreads.
848 * 687 *
849 * Both torture_cleanup_begin() and torture_cl 688 * Both torture_cleanup_begin() and torture_cleanup_end() must be paired,
850 * in order to correctly perform the cleanup. 689 * in order to correctly perform the cleanup. They are separated because
851 * threads can still need to reference the tor 690 * threads can still need to reference the torture_type type, thus nullify
852 * only after completing all other relevant ca 691 * only after completing all other relevant calls.
853 */ 692 */
854 bool torture_cleanup_begin(void) 693 bool torture_cleanup_begin(void)
855 { 694 {
856 mutex_lock(&fullstop_mutex); 695 mutex_lock(&fullstop_mutex);
857 if (READ_ONCE(fullstop) == FULLSTOP_SH 696 if (READ_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
858 pr_warn("Concurrent rmmod and 697 pr_warn("Concurrent rmmod and shutdown illegal!\n");
859 mutex_unlock(&fullstop_mutex); 698 mutex_unlock(&fullstop_mutex);
860 schedule_timeout_uninterruptib 699 schedule_timeout_uninterruptible(10);
861 return true; 700 return true;
862 } 701 }
863 WRITE_ONCE(fullstop, FULLSTOP_RMMOD); 702 WRITE_ONCE(fullstop, FULLSTOP_RMMOD);
864 mutex_unlock(&fullstop_mutex); 703 mutex_unlock(&fullstop_mutex);
865 torture_shutdown_cleanup(); 704 torture_shutdown_cleanup();
866 torture_shuffle_cleanup(); 705 torture_shuffle_cleanup();
867 torture_stutter_cleanup(); 706 torture_stutter_cleanup();
868 torture_onoff_cleanup(); 707 torture_onoff_cleanup();
869 return false; 708 return false;
870 } 709 }
871 EXPORT_SYMBOL_GPL(torture_cleanup_begin); 710 EXPORT_SYMBOL_GPL(torture_cleanup_begin);
872 711
873 void torture_cleanup_end(void) 712 void torture_cleanup_end(void)
874 { 713 {
875 mutex_lock(&fullstop_mutex); 714 mutex_lock(&fullstop_mutex);
876 torture_type = NULL; 715 torture_type = NULL;
877 mutex_unlock(&fullstop_mutex); 716 mutex_unlock(&fullstop_mutex);
878 } 717 }
879 EXPORT_SYMBOL_GPL(torture_cleanup_end); 718 EXPORT_SYMBOL_GPL(torture_cleanup_end);
880 719
881 /* 720 /*
882 * Is it time for the current torture test to 721 * Is it time for the current torture test to stop?
883 */ 722 */
884 bool torture_must_stop(void) 723 bool torture_must_stop(void)
885 { 724 {
886 return torture_must_stop_irq() || kthr 725 return torture_must_stop_irq() || kthread_should_stop();
887 } 726 }
888 EXPORT_SYMBOL_GPL(torture_must_stop); 727 EXPORT_SYMBOL_GPL(torture_must_stop);
889 728
890 /* 729 /*
891 * Is it time for the current torture test to 730 * Is it time for the current torture test to stop? This is the irq-safe
892 * version, hence no check for kthread_should_ 731 * version, hence no check for kthread_should_stop().
893 */ 732 */
894 bool torture_must_stop_irq(void) 733 bool torture_must_stop_irq(void)
895 { 734 {
896 return READ_ONCE(fullstop) != FULLSTOP 735 return READ_ONCE(fullstop) != FULLSTOP_DONTSTOP;
897 } 736 }
898 EXPORT_SYMBOL_GPL(torture_must_stop_irq); 737 EXPORT_SYMBOL_GPL(torture_must_stop_irq);
899 738
900 /* 739 /*
901 * Each kthread must wait for kthread_should_s 740 * Each kthread must wait for kthread_should_stop() before returning from
902 * its top-level function, otherwise segfaults 741 * its top-level function, otherwise segfaults ensue. This function
903 * prints a "stopping" message and waits for k 742 * prints a "stopping" message and waits for kthread_should_stop(), and
904 * should be called from all torture kthreads 743 * should be called from all torture kthreads immediately prior to
905 * returning. 744 * returning.
906 */ 745 */
907 void torture_kthread_stopping(char *title) 746 void torture_kthread_stopping(char *title)
908 { 747 {
909 char buf[128]; 748 char buf[128];
910 749
911 snprintf(buf, sizeof(buf), "%s is stop !! 750 snprintf(buf, sizeof(buf), "Stopping %s", title);
912 VERBOSE_TOROUT_STRING(buf); 751 VERBOSE_TOROUT_STRING(buf);
913 while (!kthread_should_stop()) { 752 while (!kthread_should_stop()) {
914 torture_shutdown_absorb(title) 753 torture_shutdown_absorb(title);
915 schedule_timeout_uninterruptib !! 754 schedule_timeout_uninterruptible(1);
916 } 755 }
917 } 756 }
918 EXPORT_SYMBOL_GPL(torture_kthread_stopping); 757 EXPORT_SYMBOL_GPL(torture_kthread_stopping);
919 758
920 /* 759 /*
921 * Create a generic torture kthread that is im 760 * Create a generic torture kthread that is immediately runnable. If you
922 * need the kthread to be stopped so that you 761 * need the kthread to be stopped so that you can do something to it before
923 * it starts, you will need to open-code your 762 * it starts, you will need to open-code your own.
924 */ 763 */
925 int _torture_create_kthread(int (*fn)(void *ar 764 int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
926 char *f, struct ta !! 765 char *f, struct task_struct **tp)
927 { 766 {
928 int ret = 0; 767 int ret = 0;
929 768
930 VERBOSE_TOROUT_STRING(m); 769 VERBOSE_TOROUT_STRING(m);
931 *tp = kthread_create(fn, arg, "%s", s) !! 770 *tp = kthread_run(fn, arg, "%s", s);
932 if (IS_ERR(*tp)) { 771 if (IS_ERR(*tp)) {
933 ret = PTR_ERR(*tp); 772 ret = PTR_ERR(*tp);
934 TOROUT_ERRSTRING(f); !! 773 VERBOSE_TOROUT_ERRSTRING(f);
935 *tp = NULL; 774 *tp = NULL;
936 return ret; <<
937 } 775 }
938 <<
939 if (cbf) <<
940 cbf(*tp); <<
941 <<
942 wake_up_process(*tp); // Process is s <<
943 torture_shuffle_task_register(*tp); 776 torture_shuffle_task_register(*tp);
944 return ret; 777 return ret;
945 } 778 }
946 EXPORT_SYMBOL_GPL(_torture_create_kthread); 779 EXPORT_SYMBOL_GPL(_torture_create_kthread);
947 780
948 /* 781 /*
949 * Stop a generic kthread, emitting a message. 782 * Stop a generic kthread, emitting a message.
950 */ 783 */
951 void _torture_stop_kthread(char *m, struct tas 784 void _torture_stop_kthread(char *m, struct task_struct **tp)
952 { 785 {
953 if (*tp == NULL) 786 if (*tp == NULL)
954 return; 787 return;
955 VERBOSE_TOROUT_STRING(m); 788 VERBOSE_TOROUT_STRING(m);
956 kthread_stop(*tp); 789 kthread_stop(*tp);
957 *tp = NULL; 790 *tp = NULL;
958 } 791 }
959 EXPORT_SYMBOL_GPL(_torture_stop_kthread); 792 EXPORT_SYMBOL_GPL(_torture_stop_kthread);
960 793
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