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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1757 jermar 29
/** @addtogroup genericproc
1702 cejka 30
 * @{
31
 */
32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
1248 jermar 35
 * @brief	Task management.
36
 */
37
 
1 jermar 38
#include <proc/thread.h>
39
#include <proc/task.h>
703 jermar 40
#include <mm/as.h>
814 palkovsky 41
#include <mm/slab.h>
2183 jermar 42
#include <atomic.h>
1 jermar 43
#include <synch/spinlock.h>
2109 jermar 44
#include <synch/waitq.h>
1 jermar 45
#include <arch.h>
3137 jermar 46
#include <arch/barrier.h>
2504 jermar 47
#include <adt/avl.h>
1159 jermar 48
#include <adt/btree.h>
788 jermar 49
#include <adt/list.h>
955 palkovsky 50
#include <ipc/ipc.h>
3222 svoboda 51
#include <ipc/ipcrsc.h>
1060 palkovsky 52
#include <print.h>
1579 jermar 53
#include <errno.h>
2050 decky 54
#include <func.h>
1288 jermar 55
#include <syscall/copy.h>
973 palkovsky 56
 
2504 jermar 57
/** Spinlock protecting the tasks_tree AVL tree. */
623 jermar 58
SPINLOCK_INITIALIZE(tasks_lock);
1636 jermar 59
 
2504 jermar 60
/** AVL tree of active tasks.
1636 jermar 61
 *
2504 jermar 62
 * The task is guaranteed to exist after it was found in the tasks_tree as
2087 jermar 63
 * long as:
1636 jermar 64
 * @li the tasks_lock is held,
2087 jermar 65
 * @li the task's lock is held when task's lock is acquired before releasing
66
 *     tasks_lock or
1880 jermar 67
 * @li the task's refcount is greater than 0
1636 jermar 68
 *
69
 */
2504 jermar 70
avltree_t tasks_tree;
1636 jermar 71
 
1005 palkovsky 72
static task_id_t task_counter = 0;
1 jermar 73
 
3359 jermar 74
/** Initialize kernel tasks support. */
1 jermar 75
void task_init(void)
76
{
15 jermar 77
	TASK = NULL;
2504 jermar 78
	avltree_create(&tasks_tree);
1 jermar 79
}
80
 
2504 jermar 81
/*
3359 jermar 82
 * The idea behind this walker is to remember a single task different from
83
 * TASK.
2504 jermar 84
 */
85
static bool task_done_walker(avltree_node_t *node, void *arg)
86
{
87
	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
88
	task_t **tp = (task_t **) arg;
89
 
90
	if (t != TASK) { 
91
		*tp = t;
92
		return false;	/* stop walking */
93
	}
94
 
95
	return true;	/* continue the walk */
96
}
97
 
3359 jermar 98
/** Kill all tasks except the current task. */
2227 decky 99
void task_done(void)
100
{
101
	task_t *t;
102
	do { /* Repeat until there are any tasks except TASK */
103
 
104
		/* Messing with task structures, avoid deadlock */
105
		ipl_t ipl = interrupts_disable();
106
		spinlock_lock(&tasks_lock);
107
 
108
		t = NULL;
2504 jermar 109
		avltree_walk(&tasks_tree, task_done_walker, &t);
2227 decky 110
 
111
		if (t != NULL) {
112
			task_id_t id = t->taskid;
113
 
114
			spinlock_unlock(&tasks_lock);
115
			interrupts_restore(ipl);
116
 
117
#ifdef CONFIG_DEBUG
3063 decky 118
			printf("Killing task %" PRIu64 "\n", id);
2227 decky 119
#endif			
120
			task_kill(id);
2632 decky 121
			thread_usleep(10000);
2227 decky 122
		} else {
123
			spinlock_unlock(&tasks_lock);
124
			interrupts_restore(ipl);
125
		}
126
 
127
	} while (t != NULL);
128
}
107 decky 129
 
3359 jermar 130
/** Create new task with no threads.
107 decky 131
 *
3359 jermar 132
 * @param as		Task's address space.
3566 svoboda 133
 * @param name		Symbolic name (a copy is made).
107 decky 134
 *
3359 jermar 135
 * @return		New task's structure.
107 decky 136
 *
137
 */
1062 jermar 138
task_t *task_create(as_t *as, char *name)
1 jermar 139
{
413 jermar 140
	ipl_t ipl;
1 jermar 141
	task_t *ta;
1040 palkovsky 142
	int i;
1 jermar 143
 
822 palkovsky 144
	ta = (task_t *) malloc(sizeof(task_t), 0);
145
 
1185 jermar 146
	task_create_arch(ta);
147
 
822 palkovsky 148
	spinlock_initialize(&ta->lock, "task_ta_lock");
149
	list_initialize(&ta->th_head);
150
	ta->as = as;
3566 svoboda 151
 
152
	memcpy(ta->name, name, TASK_NAME_BUFLEN);
153
	ta->name[TASK_NAME_BUFLEN - 1] = '\0';
154
 
2446 jermar 155
	atomic_set(&ta->refcount, 0);
156
	atomic_set(&ta->lifecount, 0);
1839 decky 157
	ta->context = CONTEXT;
1579 jermar 158
 
1174 jermar 159
	ta->capabilities = 0;
2039 decky 160
	ta->cycles = 0;
3438 svoboda 161
 
162
#ifdef CONFIG_UDEBUG
163
	/* Init debugging stuff */
164
	udebug_task_init(&ta->udebug);
165
 
166
	/* Init kbox stuff */
3620 svoboda 167
	ipc_answerbox_init(&ta->kb.box, ta);
168
	ta->kb.thread = NULL;
169
	mutex_initialize(&ta->kb.cleanup_lock, MUTEX_PASSIVE);
170
	ta->kb.finished = false;
3438 svoboda 171
#endif
172
 
2802 jermar 173
	ipc_answerbox_init(&ta->answerbox, ta);
1839 decky 174
	for (i = 0; i < IPC_MAX_PHONES; i++)
1040 palkovsky 175
		ipc_phone_init(&ta->phones[i]);
2087 jermar 176
	if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context,
177
	    ta->context)))
1040 palkovsky 178
		ipc_phone_connect(&ta->phones[0], ipc_phone_0);
998 palkovsky 179
	atomic_set(&ta->active_calls, 0);
1460 jermar 180
 
3186 jermar 181
	mutex_initialize(&ta->futexes_lock, MUTEX_PASSIVE);
1460 jermar 182
	btree_create(&ta->futexes);
822 palkovsky 183
 
184
	ipl = interrupts_disable();
1468 jermar 185
 
186
	/*
187
	 * Increment address space reference count.
188
	 */
2183 jermar 189
	atomic_inc(&as->refcount);
1468 jermar 190
 
822 palkovsky 191
	spinlock_lock(&tasks_lock);
1005 palkovsky 192
	ta->taskid = ++task_counter;
2504 jermar 193
	avltree_node_initialize(&ta->tasks_tree_node);
194
	ta->tasks_tree_node.key = ta->taskid; 
195
	avltree_insert(&tasks_tree, &ta->tasks_tree_node);
822 palkovsky 196
	spinlock_unlock(&tasks_lock);
197
	interrupts_restore(ipl);
198
 
1 jermar 199
	return ta;
200
}
201
 
1579 jermar 202
/** Destroy task.
203
 *
3359 jermar 204
 * @param t		Task to be destroyed.
1579 jermar 205
 */
206
void task_destroy(task_t *t)
207
{
2446 jermar 208
	/*
209
	 * Remove the task from the task B+tree.
210
	 */
211
	spinlock_lock(&tasks_lock);
2504 jermar 212
	avltree_delete(&tasks_tree, &t->tasks_tree_node);
2446 jermar 213
	spinlock_unlock(&tasks_lock);
214
 
215
	/*
216
	 * Perform architecture specific task destruction.
217
	 */
1587 jermar 218
	task_destroy_arch(t);
2446 jermar 219
 
220
	/*
221
	 * Free up dynamically allocated state.
222
	 */
1587 jermar 223
	btree_destroy(&t->futexes);
224
 
2446 jermar 225
	/*
226
	 * Drop our reference to the address space.
227
	 */
2183 jermar 228
	if (atomic_predec(&t->as->refcount) == 0) 
1587 jermar 229
		as_destroy(t->as);
230
 
231
	free(t);
232
	TASK = NULL;
1579 jermar 233
}
234
 
1176 jermar 235
/** Syscall for reading task ID from userspace.
236
 *
3359 jermar 237
 * @param		uspace_task_id userspace address of 8-byte buffer
238
 * 			where to store current task ID.
1176 jermar 239
 *
3359 jermar 240
 * @return		Zero on success or an error code from @ref errno.h.
1176 jermar 241
 */
1780 jermar 242
unative_t sys_task_get_id(task_id_t *uspace_task_id)
1176 jermar 243
{
244
	/*
3359 jermar 245
	 * No need to acquire lock on TASK because taskid remains constant for
246
	 * the lifespan of the task.
1176 jermar 247
	 */
2087 jermar 248
	return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid,
249
	    sizeof(TASK->taskid));
1176 jermar 250
}
251
 
3983 svoboda 252
/** Syscall for setting the task name.
253
 *
254
 * The name simplifies identifying the task in the task list.
255
 *
256
 * @param name	The new name for the task. (typically the same
257
 *		as the command used to execute it).
258
 *
259
 * @return 0 on success or an error code from @ref errno.h.
260
 */
261
unative_t sys_task_set_name(const char *uspace_name, size_t name_len)
262
{
263
	int rc;
264
	char namebuf[TASK_NAME_BUFLEN];
265
 
266
	/* Cap length of name and copy it from userspace. */
267
 
268
	if (name_len > TASK_NAME_BUFLEN - 1)
269
		name_len = TASK_NAME_BUFLEN - 1;
270
 
271
	rc = copy_from_uspace(namebuf, uspace_name, name_len);
272
	if (rc != 0)
273
		return (unative_t) rc;
274
 
275
	namebuf[name_len] = '\0';
276
	strcpy(TASK->name, namebuf);
277
 
278
	return EOK;
279
}
280
 
1178 jermar 281
/** Find task structure corresponding to task ID.
282
 *
3359 jermar 283
 * The tasks_lock must be already held by the caller of this function and
284
 * interrupts must be disabled.
1178 jermar 285
 *
3359 jermar 286
 * @param id		Task ID.
1178 jermar 287
 *
3359 jermar 288
 * @return		Task structure address or NULL if there is no such task
289
 * 			ID.
1178 jermar 290
 */
3359 jermar 291
task_t *task_find_by_id(task_id_t id) { avltree_node_t *node;
1178 jermar 292
 
2504 jermar 293
	node = avltree_search(&tasks_tree, (avltree_key_t) id);
294
 
295
	if (node)
296
		return avltree_get_instance(node, task_t, tasks_tree_node); 
297
	return NULL;
1178 jermar 298
}
299
 
2039 decky 300
/** Get accounting data of given task.
301
 *
3359 jermar 302
 * Note that task lock of 't' must be already held and interrupts must be
303
 * already disabled.
2039 decky 304
 *
3359 jermar 305
 * @param t		Pointer to thread.
2039 decky 306
 *
3359 jermar 307
 * @return		Number of cycles used by the task and all its threads
308
 * 			so far.
2039 decky 309
 */
310
uint64_t task_get_accounting(task_t *t)
311
{
312
	/* Accumulated value of task */
313
	uint64_t ret = t->cycles;
314
 
315
	/* Current values of threads */
316
	link_t *cur;
317
	for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {
318
		thread_t *thr = list_get_instance(cur, thread_t, th_link);
319
 
320
		spinlock_lock(&thr->lock);
2042 decky 321
		/* Process only counted threads */
322
		if (!thr->uncounted) {
2087 jermar 323
			if (thr == THREAD) {
324
				/* Update accounting of current thread */
325
				thread_update_accounting();
326
			} 
2042 decky 327
			ret += thr->cycles;
328
		}
2039 decky 329
		spinlock_unlock(&thr->lock);
330
	}
331
 
332
	return ret;
333
}
334
 
1579 jermar 335
/** Kill task.
336
 *
2446 jermar 337
 * This function is idempotent.
338
 * It signals all the task's threads to bail it out.
339
 *
3359 jermar 340
 * @param id		ID of the task to be killed.
1579 jermar 341
 *
3359 jermar 342
 * @return		Zero on success or an error code from errno.h.
1579 jermar 343
 */
344
int task_kill(task_id_t id)
345
{
346
	ipl_t ipl;
347
	task_t *ta;
348
	link_t *cur;
1600 jermar 349
 
350
	if (id == 1)
351
		return EPERM;
1579 jermar 352
 
353
	ipl = interrupts_disable();
354
	spinlock_lock(&tasks_lock);
355
	if (!(ta = task_find_by_id(id))) {
356
		spinlock_unlock(&tasks_lock);
357
		interrupts_restore(ipl);
358
		return ENOENT;
359
	}
1587 jermar 360
	spinlock_unlock(&tasks_lock);
1579 jermar 361
 
1585 jermar 362
	/*
3359 jermar 363
	 * Interrupt all threads.
2446 jermar 364
	 */
365
	spinlock_lock(&ta->lock);
1579 jermar 366
	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
367
		thread_t *thr;
2446 jermar 368
		bool sleeping = false;
1579 jermar 369
 
370
		thr = list_get_instance(cur, thread_t, th_link);
3908 decky 371
 
1579 jermar 372
		spinlock_lock(&thr->lock);
373
		thr->interrupted = true;
374
		if (thr->state == Sleeping)
375
			sleeping = true;
376
		spinlock_unlock(&thr->lock);
377
 
378
		if (sleeping)
2109 jermar 379
			waitq_interrupt_sleep(thr);
1579 jermar 380
	}
1580 jermar 381
	spinlock_unlock(&ta->lock);
382
	interrupts_restore(ipl);
1579 jermar 383
 
384
	return 0;
385
}
386
 
2504 jermar 387
static bool task_print_walker(avltree_node_t *node, void *arg)
388
{
389
	task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
390
	int j;
391
 
392
	spinlock_lock(&t->lock);
393
 
394
	uint64_t cycles;
395
	char suffix;
396
	order(task_get_accounting(t), &cycles, &suffix);
3063 decky 397
 
398
#ifdef __32_BITS__	
3987 svoboda 399
	printf("%-6" PRIu64 " %-12s %-3" PRIu32 " %10p %10p %9" PRIu64
3137 jermar 400
	    "%c %7ld %6ld", t->taskid, t->name, t->context, t, t->as, cycles,
401
	    suffix, atomic_get(&t->refcount), atomic_get(&t->active_calls));
3063 decky 402
#endif
403
 
404
#ifdef __64_BITS__
3987 svoboda 405
	printf("%-6" PRIu64 " %-12s %-3" PRIu32 " %18p %18p %9" PRIu64
3137 jermar 406
	    "%c %7ld %6ld", t->taskid, t->name, t->context, t, t->as, cycles,
407
	    suffix, atomic_get(&t->refcount), atomic_get(&t->active_calls));
3063 decky 408
#endif
409
 
2504 jermar 410
	for (j = 0; j < IPC_MAX_PHONES; j++) {
411
		if (t->phones[j].callee)
3063 decky 412
			printf(" %d:%p", j, t->phones[j].callee);
2504 jermar 413
	}
414
	printf("\n");
415
 
416
	spinlock_unlock(&t->lock);
417
	return true;
418
}
419
 
1060 palkovsky 420
/** Print task list */
421
void task_print_list(void)
422
{
423
	ipl_t ipl;
424
 
2227 decky 425
	/* Messing with task structures, avoid deadlock */
1060 palkovsky 426
	ipl = interrupts_disable();
427
	spinlock_lock(&tasks_lock);
428
 
3063 decky 429
#ifdef __32_BITS__	
3988 svoboda 430
	printf("taskid name         ctx address    as         "
3137 jermar 431
	    "cycles     threads calls  callee\n");
3987 svoboda 432
	printf("------ ------------ --- ---------- ---------- "
3137 jermar 433
	    "---------- ------- ------ ------>\n");
3063 decky 434
#endif
435
 
436
#ifdef __64_BITS__
3988 svoboda 437
	printf("taskid name         ctx address            as                 "
3137 jermar 438
	    "cycles     threads calls  callee\n");
3987 svoboda 439
	printf("------ ------------ --- ------------------ ------------------ "
3137 jermar 440
	    "---------- ------- ------ ------>\n");
3063 decky 441
#endif
442
 
2504 jermar 443
	avltree_walk(&tasks_tree, task_print_walker, NULL);
1159 jermar 444
 
1060 palkovsky 445
	spinlock_unlock(&tasks_lock);
446
	interrupts_restore(ipl);
447
}
1579 jermar 448
 
1757 jermar 449
/** @}
1702 cejka 450
 */