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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/smp_lock.h> |
13 | #include <linux/spinlock.h> |
14 | #include <linux/sysdev.h> |
15 | #include <linux/timer.h> |
16 | #include <linux/freezer.h> |
17 | |
18 | #include "rtmutex.h" |
19 | |
20 | #define MAX_RT_TEST_THREADS 8 |
21 | #define MAX_RT_TEST_MUTEXES 8 |
22 | |
23 | static spinlock_t rttest_lock; |
24 | static atomic_t rttest_event; |
25 | |
26 | struct test_thread_data { |
27 | int opcode; |
28 | int opdata; |
29 | int mutexes[MAX_RT_TEST_MUTEXES]; |
30 | int bkl; |
31 | int event; |
32 | struct sys_device sysdev; |
33 | }; |
34 | |
35 | static struct test_thread_data thread_data[MAX_RT_TEST_THREADS]; |
36 | static struct task_struct *threads[MAX_RT_TEST_THREADS]; |
37 | static struct rt_mutex mutexes[MAX_RT_TEST_MUTEXES]; |
38 | |
39 | enum test_opcodes { |
40 | RTTEST_NOP = 0, |
41 | RTTEST_SCHEDOT, /* 1 Sched other, data = nice */ |
42 | RTTEST_SCHEDRT, /* 2 Sched fifo, data = prio */ |
43 | RTTEST_LOCK, /* 3 Lock uninterruptible, data = lockindex */ |
44 | RTTEST_LOCKNOWAIT, /* 4 Lock uninterruptible no wait in wakeup, data = lockindex */ |
45 | RTTEST_LOCKINT, /* 5 Lock interruptible, data = lockindex */ |
46 | RTTEST_LOCKINTNOWAIT, /* 6 Lock interruptible no wait in wakeup, data = lockindex */ |
47 | RTTEST_LOCKCONT, /* 7 Continue locking after the wakeup delay */ |
48 | RTTEST_UNLOCK, /* 8 Unlock, data = lockindex */ |
49 | RTTEST_LOCKBKL, /* 9 Lock BKL */ |
50 | RTTEST_UNLOCKBKL, /* 10 Unlock BKL */ |
51 | RTTEST_SIGNAL, /* 11 Signal other test thread, data = thread id */ |
52 | RTTEST_RESETEVENT = 98, /* 98 Reset event counter */ |
53 | RTTEST_RESET = 99, /* 99 Reset all pending operations */ |
54 | }; |
55 | |
56 | static int handle_op(struct test_thread_data *td, int lockwakeup) |
57 | { |
58 | int i, id, ret = -EINVAL; |
59 | |
60 | switch(td->opcode) { |
61 | |
62 | case RTTEST_NOP: |
63 | return 0; |
64 | |
65 | case RTTEST_LOCKCONT: |
66 | td->mutexes[td->opdata] = 1; |
67 | td->event = atomic_add_return(1, &rttest_event); |
68 | return 0; |
69 | |
70 | case RTTEST_RESET: |
71 | for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) { |
72 | if (td->mutexes[i] == 4) { |
73 | rt_mutex_unlock(&mutexes[i]); |
74 | td->mutexes[i] = 0; |
75 | } |
76 | } |
77 | |
78 | if (!lockwakeup && td->bkl == 4) { |
79 | #ifdef CONFIG_LOCK_KERNEL |
80 | unlock_kernel(); |
81 | #endif |
82 | td->bkl = 0; |
83 | } |
84 | return 0; |
85 | |
86 | case RTTEST_RESETEVENT: |
87 | atomic_set(&rttest_event, 0); |
88 | return 0; |
89 | |
90 | default: |
91 | if (lockwakeup) |
92 | return ret; |
93 | } |
94 | |
95 | switch(td->opcode) { |
96 | |
97 | case RTTEST_LOCK: |
98 | case RTTEST_LOCKNOWAIT: |
99 | id = td->opdata; |
100 | if (id < 0 || id >= MAX_RT_TEST_MUTEXES) |
101 | return ret; |
102 | |
103 | td->mutexes[id] = 1; |
104 | td->event = atomic_add_return(1, &rttest_event); |
105 | rt_mutex_lock(&mutexes[id]); |
106 | td->event = atomic_add_return(1, &rttest_event); |
107 | td->mutexes[id] = 4; |
108 | return 0; |
109 | |
110 | case RTTEST_LOCKINT: |
111 | case RTTEST_LOCKINTNOWAIT: |
112 | id = td->opdata; |
113 | if (id < 0 || id >= MAX_RT_TEST_MUTEXES) |
114 | return ret; |
115 | |
116 | td->mutexes[id] = 1; |
117 | td->event = atomic_add_return(1, &rttest_event); |
118 | ret = rt_mutex_lock_interruptible(&mutexes[id], 0); |
119 | td->event = atomic_add_return(1, &rttest_event); |
120 | td->mutexes[id] = ret ? 0 : 4; |
121 | return ret ? -EINTR : 0; |
122 | |
123 | case RTTEST_UNLOCK: |
124 | id = td->opdata; |
125 | if (id < 0 || id >= MAX_RT_TEST_MUTEXES || td->mutexes[id] != 4) |
126 | return ret; |
127 | |
128 | td->event = atomic_add_return(1, &rttest_event); |
129 | rt_mutex_unlock(&mutexes[id]); |
130 | td->event = atomic_add_return(1, &rttest_event); |
131 | td->mutexes[id] = 0; |
132 | return 0; |
133 | |
134 | case RTTEST_LOCKBKL: |
135 | if (td->bkl) |
136 | return 0; |
137 | td->bkl = 1; |
138 | #ifdef CONFIG_LOCK_KERNEL |
139 | lock_kernel(); |
140 | #endif |
141 | td->bkl = 4; |
142 | return 0; |
143 | |
144 | case RTTEST_UNLOCKBKL: |
145 | if (td->bkl != 4) |
146 | break; |
147 | #ifdef CONFIG_LOCK_KERNEL |
148 | unlock_kernel(); |
149 | #endif |
150 | td->bkl = 0; |
151 | return 0; |
152 | |
153 | default: |
154 | break; |
155 | } |
156 | return ret; |
157 | } |
158 | |
159 | /* |
160 | * Schedule replacement for rtsem_down(). Only called for threads with |
161 | * PF_MUTEX_TESTER set. |
162 | * |
163 | * This allows us to have finegrained control over the event flow. |
164 | * |
165 | */ |
166 | void schedule_rt_mutex_test(struct rt_mutex *mutex) |
167 | { |
168 | int tid, op, dat; |
169 | struct test_thread_data *td; |
170 | |
171 | /* We have to lookup the task */ |
172 | for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) { |
173 | if (threads[tid] == current) |
174 | break; |
175 | } |
176 | |
177 | BUG_ON(tid == MAX_RT_TEST_THREADS); |
178 | |
179 | td = &thread_data[tid]; |
180 | |
181 | op = td->opcode; |
182 | dat = td->opdata; |
183 | |
184 | switch (op) { |
185 | case RTTEST_LOCK: |
186 | case RTTEST_LOCKINT: |
187 | case RTTEST_LOCKNOWAIT: |
188 | case RTTEST_LOCKINTNOWAIT: |
189 | if (mutex != &mutexes[dat]) |
190 | break; |
191 | |
192 | if (td->mutexes[dat] != 1) |
193 | break; |
194 | |
195 | td->mutexes[dat] = 2; |
196 | td->event = atomic_add_return(1, &rttest_event); |
197 | break; |
198 | |
199 | case RTTEST_LOCKBKL: |
200 | default: |
201 | break; |
202 | } |
203 | |
204 | schedule(); |
205 | |
206 | |
207 | switch (op) { |
208 | case RTTEST_LOCK: |
209 | case RTTEST_LOCKINT: |
210 | if (mutex != &mutexes[dat]) |
211 | return; |
212 | |
213 | if (td->mutexes[dat] != 2) |
214 | return; |
215 | |
216 | td->mutexes[dat] = 3; |
217 | td->event = atomic_add_return(1, &rttest_event); |
218 | break; |
219 | |
220 | case RTTEST_LOCKNOWAIT: |
221 | case RTTEST_LOCKINTNOWAIT: |
222 | if (mutex != &mutexes[dat]) |
223 | return; |
224 | |
225 | if (td->mutexes[dat] != 2) |
226 | return; |
227 | |
228 | td->mutexes[dat] = 1; |
229 | td->event = atomic_add_return(1, &rttest_event); |
230 | return; |
231 | |
232 | case RTTEST_LOCKBKL: |
233 | return; |
234 | default: |
235 | return; |
236 | } |
237 | |
238 | td->opcode = 0; |
239 | |
240 | for (;;) { |
241 | set_current_state(TASK_INTERRUPTIBLE); |
242 | |
243 | if (td->opcode > 0) { |
244 | int ret; |
245 | |
246 | set_current_state(TASK_RUNNING); |
247 | ret = handle_op(td, 1); |
248 | set_current_state(TASK_INTERRUPTIBLE); |
249 | if (td->opcode == RTTEST_LOCKCONT) |
250 | break; |
251 | td->opcode = ret; |
252 | } |
253 | |
254 | /* Wait for the next command to be executed */ |
255 | schedule(); |
256 | } |
257 | |
258 | /* Restore previous command and data */ |
259 | td->opcode = op; |
260 | td->opdata = dat; |
261 | } |
262 | |
263 | static int test_func(void *data) |
264 | { |
265 | struct test_thread_data *td = data; |
266 | int ret; |
267 | |
268 | current->flags |= PF_MUTEX_TESTER; |
269 | set_freezable(); |
270 | allow_signal(SIGHUP); |
271 | |
272 | for(;;) { |
273 | |
274 | set_current_state(TASK_INTERRUPTIBLE); |
275 | |
276 | if (td->opcode > 0) { |
277 | set_current_state(TASK_RUNNING); |
278 | ret = handle_op(td, 0); |
279 | set_current_state(TASK_INTERRUPTIBLE); |
280 | td->opcode = ret; |
281 | } |
282 | |
283 | /* Wait for the next command to be executed */ |
284 | schedule(); |
285 | try_to_freeze(); |
286 | |
287 | if (signal_pending(current)) |
288 | flush_signals(current); |
289 | |
290 | if(kthread_should_stop()) |
291 | break; |
292 | } |
293 | return 0; |
294 | } |
295 | |
296 | /** |
297 | * sysfs_test_command - interface for test commands |
298 | * @dev: thread reference |
299 | * @buf: command for actual step |
300 | * @count: length of buffer |
301 | * |
302 | * command syntax: |
303 | * |
304 | * opcode:data |
305 | */ |
306 | static ssize_t sysfs_test_command(struct sys_device *dev, struct sysdev_attribute *attr, |
307 | const char *buf, size_t count) |
308 | { |
309 | struct sched_param schedpar; |
310 | struct test_thread_data *td; |
311 | char cmdbuf[32]; |
312 | int op, dat, tid, ret; |
313 | |
314 | td = container_of(dev, struct test_thread_data, sysdev); |
315 | tid = td->sysdev.id; |
316 | |
317 | /* strings from sysfs write are not 0 terminated! */ |
318 | if (count >= sizeof(cmdbuf)) |
319 | return -EINVAL; |
320 | |
321 | /* strip of \n: */ |
322 | if (buf[count-1] == '\n') |
323 | count--; |
324 | if (count < 1) |
325 | return -EINVAL; |
326 | |
327 | memcpy(cmdbuf, buf, count); |
328 | cmdbuf[count] = 0; |
329 | |
330 | if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2) |
331 | return -EINVAL; |
332 | |
333 | switch (op) { |
334 | case RTTEST_SCHEDOT: |
335 | schedpar.sched_priority = 0; |
336 | ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar); |
337 | if (ret) |
338 | return ret; |
339 | set_user_nice(current, 0); |
340 | break; |
341 | |
342 | case RTTEST_SCHEDRT: |
343 | schedpar.sched_priority = dat; |
344 | ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar); |
345 | if (ret) |
346 | return ret; |
347 | break; |
348 | |
349 | case RTTEST_SIGNAL: |
350 | send_sig(SIGHUP, threads[tid], 0); |
351 | break; |
352 | |
353 | default: |
354 | if (td->opcode > 0) |
355 | return -EBUSY; |
356 | td->opdata = dat; |
357 | td->opcode = op; |
358 | wake_up_process(threads[tid]); |
359 | } |
360 | |
361 | return count; |
362 | } |
363 | |
364 | /** |
365 | * sysfs_test_status - sysfs interface for rt tester |
366 | * @dev: thread to query |
367 | * @buf: char buffer to be filled with thread status info |
368 | */ |
369 | static ssize_t sysfs_test_status(struct sys_device *dev, struct sysdev_attribute *attr, |
370 | char *buf) |
371 | { |
372 | struct test_thread_data *td; |
373 | struct task_struct *tsk; |
374 | char *curr = buf; |
375 | int i; |
376 | |
377 | td = container_of(dev, struct test_thread_data, sysdev); |
378 | tsk = threads[td->sysdev.id]; |
379 | |
380 | spin_lock(&rttest_lock); |
381 | |
382 | curr += sprintf(curr, |
383 | "O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, K: %d, M:", |
384 | td->opcode, td->event, tsk->state, |
385 | (MAX_RT_PRIO - 1) - tsk->prio, |
386 | (MAX_RT_PRIO - 1) - tsk->normal_prio, |
387 | tsk->pi_blocked_on, td->bkl); |
388 | |
389 | for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--) |
390 | curr += sprintf(curr, "%d", td->mutexes[i]); |
391 | |
392 | spin_unlock(&rttest_lock); |
393 | |
394 | curr += sprintf(curr, ", T: %p, R: %p\n", tsk, |
395 | mutexes[td->sysdev.id].owner); |
396 | |
397 | return curr - buf; |
398 | } |
399 | |
400 | static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL); |
401 | static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command); |
402 | |
403 | static struct sysdev_class rttest_sysclass = { |
404 | .name = "rttest", |
405 | }; |
406 | |
407 | static int init_test_thread(int id) |
408 | { |
409 | thread_data[id].sysdev.cls = &rttest_sysclass; |
410 | thread_data[id].sysdev.id = id; |
411 | |
412 | threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id); |
413 | if (IS_ERR(threads[id])) |
414 | return PTR_ERR(threads[id]); |
415 | |
416 | return sysdev_register(&thread_data[id].sysdev); |
417 | } |
418 | |
419 | static int init_rttest(void) |
420 | { |
421 | int ret, i; |
422 | |
423 | spin_lock_init(&rttest_lock); |
424 | |
425 | for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) |
426 | rt_mutex_init(&mutexes[i]); |
427 | |
428 | ret = sysdev_class_register(&rttest_sysclass); |
429 | if (ret) |
430 | return ret; |
431 | |
432 | for (i = 0; i < MAX_RT_TEST_THREADS; i++) { |
433 | ret = init_test_thread(i); |
434 | if (ret) |
435 | break; |
436 | ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status); |
437 | if (ret) |
438 | break; |
439 | ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command); |
440 | if (ret) |
441 | break; |
442 | } |
443 | |
444 | printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" ); |
445 | |
446 | return ret; |
447 | } |
448 | |
449 | device_initcall(init_rttest); |
450 |
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