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Linux/kernel/rtmutex-tester.c

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  1 /*
  2  * RT-Mutex-tester: scriptable tester for rt mutexes
  3  *
  4  * started by Thomas Gleixner:
  5  *
  6  *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
  7  *
  8  */
  9 #include <linux/kthread.h>
 10 #include <linux/module.h>
 11 #include <linux/sched.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/sysdev.h>
 14 #include <linux/timer.h>
 15 #include <linux/freezer.h>
 16 
 17 #include "rtmutex.h"
 18 
 19 #define MAX_RT_TEST_THREADS     8
 20 #define MAX_RT_TEST_MUTEXES     8
 21 
 22 static spinlock_t rttest_lock;
 23 static atomic_t rttest_event;
 24 
 25 struct test_thread_data {
 26         int                     opcode;
 27         int                     opdata;
 28         int                     mutexes[MAX_RT_TEST_MUTEXES];
 29         int                     event;
 30         struct sys_device       sysdev;
 31 };
 32 
 33 static struct test_thread_data thread_data[MAX_RT_TEST_THREADS];
 34 static struct task_struct *threads[MAX_RT_TEST_THREADS];
 35 static struct rt_mutex mutexes[MAX_RT_TEST_MUTEXES];
 36 
 37 enum test_opcodes {
 38         RTTEST_NOP = 0,
 39         RTTEST_SCHEDOT,         /* 1 Sched other, data = nice */
 40         RTTEST_SCHEDRT,         /* 2 Sched fifo, data = prio */
 41         RTTEST_LOCK,            /* 3 Lock uninterruptible, data = lockindex */
 42         RTTEST_LOCKNOWAIT,      /* 4 Lock uninterruptible no wait in wakeup, data = lockindex */
 43         RTTEST_LOCKINT,         /* 5 Lock interruptible, data = lockindex */
 44         RTTEST_LOCKINTNOWAIT,   /* 6 Lock interruptible no wait in wakeup, data = lockindex */
 45         RTTEST_LOCKCONT,        /* 7 Continue locking after the wakeup delay */
 46         RTTEST_UNLOCK,          /* 8 Unlock, data = lockindex */
 47         /* 9, 10 - reserved for BKL commemoration */
 48         RTTEST_SIGNAL = 11,     /* 11 Signal other test thread, data = thread id */
 49         RTTEST_RESETEVENT = 98, /* 98 Reset event counter */
 50         RTTEST_RESET = 99,      /* 99 Reset all pending operations */
 51 };
 52 
 53 static int handle_op(struct test_thread_data *td, int lockwakeup)
 54 {
 55         int i, id, ret = -EINVAL;
 56 
 57         switch(td->opcode) {
 58 
 59         case RTTEST_NOP:
 60                 return 0;
 61 
 62         case RTTEST_LOCKCONT:
 63                 td->mutexes[td->opdata] = 1;
 64                 td->event = atomic_add_return(1, &rttest_event);
 65                 return 0;
 66 
 67         case RTTEST_RESET:
 68                 for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) {
 69                         if (td->mutexes[i] == 4) {
 70                                 rt_mutex_unlock(&mutexes[i]);
 71                                 td->mutexes[i] = 0;
 72                         }
 73                 }
 74                 return 0;
 75 
 76         case RTTEST_RESETEVENT:
 77                 atomic_set(&rttest_event, 0);
 78                 return 0;
 79 
 80         default:
 81                 if (lockwakeup)
 82                         return ret;
 83         }
 84 
 85         switch(td->opcode) {
 86 
 87         case RTTEST_LOCK:
 88         case RTTEST_LOCKNOWAIT:
 89                 id = td->opdata;
 90                 if (id < 0 || id >= MAX_RT_TEST_MUTEXES)
 91                         return ret;
 92 
 93                 td->mutexes[id] = 1;
 94                 td->event = atomic_add_return(1, &rttest_event);
 95                 rt_mutex_lock(&mutexes[id]);
 96                 td->event = atomic_add_return(1, &rttest_event);
 97                 td->mutexes[id] = 4;
 98                 return 0;
 99 
100         case RTTEST_LOCKINT:
101         case RTTEST_LOCKINTNOWAIT:
102                 id = td->opdata;
103                 if (id < 0 || id >= MAX_RT_TEST_MUTEXES)
104                         return ret;
105 
106                 td->mutexes[id] = 1;
107                 td->event = atomic_add_return(1, &rttest_event);
108                 ret = rt_mutex_lock_interruptible(&mutexes[id], 0);
109                 td->event = atomic_add_return(1, &rttest_event);
110                 td->mutexes[id] = ret ? 0 : 4;
111                 return ret ? -EINTR : 0;
112 
113         case RTTEST_UNLOCK:
114                 id = td->opdata;
115                 if (id < 0 || id >= MAX_RT_TEST_MUTEXES || td->mutexes[id] != 4)
116                         return ret;
117 
118                 td->event = atomic_add_return(1, &rttest_event);
119                 rt_mutex_unlock(&mutexes[id]);
120                 td->event = atomic_add_return(1, &rttest_event);
121                 td->mutexes[id] = 0;
122                 return 0;
123 
124         default:
125                 break;
126         }
127         return ret;
128 }
129 
130 /*
131  * Schedule replacement for rtsem_down(). Only called for threads with
132  * PF_MUTEX_TESTER set.
133  *
134  * This allows us to have finegrained control over the event flow.
135  *
136  */
137 void schedule_rt_mutex_test(struct rt_mutex *mutex)
138 {
139         int tid, op, dat;
140         struct test_thread_data *td;
141 
142         /* We have to lookup the task */
143         for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) {
144                 if (threads[tid] == current)
145                         break;
146         }
147 
148         BUG_ON(tid == MAX_RT_TEST_THREADS);
149 
150         td = &thread_data[tid];
151 
152         op = td->opcode;
153         dat = td->opdata;
154 
155         switch (op) {
156         case RTTEST_LOCK:
157         case RTTEST_LOCKINT:
158         case RTTEST_LOCKNOWAIT:
159         case RTTEST_LOCKINTNOWAIT:
160                 if (mutex != &mutexes[dat])
161                         break;
162 
163                 if (td->mutexes[dat] != 1)
164                         break;
165 
166                 td->mutexes[dat] = 2;
167                 td->event = atomic_add_return(1, &rttest_event);
168                 break;
169 
170         default:
171                 break;
172         }
173 
174         schedule();
175 
176 
177         switch (op) {
178         case RTTEST_LOCK:
179         case RTTEST_LOCKINT:
180                 if (mutex != &mutexes[dat])
181                         return;
182 
183                 if (td->mutexes[dat] != 2)
184                         return;
185 
186                 td->mutexes[dat] = 3;
187                 td->event = atomic_add_return(1, &rttest_event);
188                 break;
189 
190         case RTTEST_LOCKNOWAIT:
191         case RTTEST_LOCKINTNOWAIT:
192                 if (mutex != &mutexes[dat])
193                         return;
194 
195                 if (td->mutexes[dat] != 2)
196                         return;
197 
198                 td->mutexes[dat] = 1;
199                 td->event = atomic_add_return(1, &rttest_event);
200                 return;
201 
202         default:
203                 return;
204         }
205 
206         td->opcode = 0;
207 
208         for (;;) {
209                 set_current_state(TASK_INTERRUPTIBLE);
210 
211                 if (td->opcode > 0) {
212                         int ret;
213 
214                         set_current_state(TASK_RUNNING);
215                         ret = handle_op(td, 1);
216                         set_current_state(TASK_INTERRUPTIBLE);
217                         if (td->opcode == RTTEST_LOCKCONT)
218                                 break;
219                         td->opcode = ret;
220                 }
221 
222                 /* Wait for the next command to be executed */
223                 schedule();
224         }
225 
226         /* Restore previous command and data */
227         td->opcode = op;
228         td->opdata = dat;
229 }
230 
231 static int test_func(void *data)
232 {
233         struct test_thread_data *td = data;
234         int ret;
235 
236         current->flags |= PF_MUTEX_TESTER;
237         set_freezable();
238         allow_signal(SIGHUP);
239 
240         for(;;) {
241 
242                 set_current_state(TASK_INTERRUPTIBLE);
243 
244                 if (td->opcode > 0) {
245                         set_current_state(TASK_RUNNING);
246                         ret = handle_op(td, 0);
247                         set_current_state(TASK_INTERRUPTIBLE);
248                         td->opcode = ret;
249                 }
250 
251                 /* Wait for the next command to be executed */
252                 schedule();
253                 try_to_freeze();
254 
255                 if (signal_pending(current))
256                         flush_signals(current);
257 
258                 if(kthread_should_stop())
259                         break;
260         }
261         return 0;
262 }
263 
264 /**
265  * sysfs_test_command - interface for test commands
266  * @dev:        thread reference
267  * @buf:        command for actual step
268  * @count:      length of buffer
269  *
270  * command syntax:
271  *
272  * opcode:data
273  */
274 static ssize_t sysfs_test_command(struct sys_device *dev, struct sysdev_attribute *attr,
275                                   const char *buf, size_t count)
276 {
277         struct sched_param schedpar;
278         struct test_thread_data *td;
279         char cmdbuf[32];
280         int op, dat, tid, ret;
281 
282         td = container_of(dev, struct test_thread_data, sysdev);
283         tid = td->sysdev.id;
284 
285         /* strings from sysfs write are not 0 terminated! */
286         if (count >= sizeof(cmdbuf))
287                 return -EINVAL;
288 
289         /* strip of \n: */
290         if (buf[count-1] == '\n')
291                 count--;
292         if (count < 1)
293                 return -EINVAL;
294 
295         memcpy(cmdbuf, buf, count);
296         cmdbuf[count] = 0;
297 
298         if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2)
299                 return -EINVAL;
300 
301         switch (op) {
302         case RTTEST_SCHEDOT:
303                 schedpar.sched_priority = 0;
304                 ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar);
305                 if (ret)
306                         return ret;
307                 set_user_nice(current, 0);
308                 break;
309 
310         case RTTEST_SCHEDRT:
311                 schedpar.sched_priority = dat;
312                 ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar);
313                 if (ret)
314                         return ret;
315                 break;
316 
317         case RTTEST_SIGNAL:
318                 send_sig(SIGHUP, threads[tid], 0);
319                 break;
320 
321         default:
322                 if (td->opcode > 0)
323                         return -EBUSY;
324                 td->opdata = dat;
325                 td->opcode = op;
326                 wake_up_process(threads[tid]);
327         }
328 
329         return count;
330 }
331 
332 /**
333  * sysfs_test_status - sysfs interface for rt tester
334  * @dev:        thread to query
335  * @buf:        char buffer to be filled with thread status info
336  */
337 static ssize_t sysfs_test_status(struct sys_device *dev, struct sysdev_attribute *attr,
338                                  char *buf)
339 {
340         struct test_thread_data *td;
341         struct task_struct *tsk;
342         char *curr = buf;
343         int i;
344 
345         td = container_of(dev, struct test_thread_data, sysdev);
346         tsk = threads[td->sysdev.id];
347 
348         spin_lock(&rttest_lock);
349 
350         curr += sprintf(curr,
351                 "O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, M:",
352                 td->opcode, td->event, tsk->state,
353                         (MAX_RT_PRIO - 1) - tsk->prio,
354                         (MAX_RT_PRIO - 1) - tsk->normal_prio,
355                 tsk->pi_blocked_on);
356 
357         for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
358                 curr += sprintf(curr, "%d", td->mutexes[i]);
359 
360         spin_unlock(&rttest_lock);
361 
362         curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
363                         mutexes[td->sysdev.id].owner);
364 
365         return curr - buf;
366 }
367 
368 static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
369 static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);
370 
371 static struct sysdev_class rttest_sysclass = {
372         .name = "rttest",
373 };
374 
375 static int init_test_thread(int id)
376 {
377         thread_data[id].sysdev.cls = &rttest_sysclass;
378         thread_data[id].sysdev.id = id;
379 
380         threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
381         if (IS_ERR(threads[id]))
382                 return PTR_ERR(threads[id]);
383 
384         return sysdev_register(&thread_data[id].sysdev);
385 }
386 
387 static int init_rttest(void)
388 {
389         int ret, i;
390 
391         spin_lock_init(&rttest_lock);
392 
393         for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
394                 rt_mutex_init(&mutexes[i]);
395 
396         ret = sysdev_class_register(&rttest_sysclass);
397         if (ret)
398                 return ret;
399 
400         for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
401                 ret = init_test_thread(i);
402                 if (ret)
403                         break;
404                 ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
405                 if (ret)
406                         break;
407                 ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
408                 if (ret)
409                         break;
410         }
411 
412         printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" );
413 
414         return ret;
415 }
416 
417 device_initcall(init_rttest);
418 

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