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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub 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
 
973 palkovsky 38
#include <main/uinit.h>
1 jermar 39
#include <proc/thread.h>
40
#include <proc/task.h>
1078 jermar 41
#include <proc/uarg.h>
703 jermar 42
#include <mm/as.h>
814 palkovsky 43
#include <mm/slab.h>
1 jermar 44
#include <synch/spinlock.h>
45
#include <arch.h>
46
#include <panic.h>
1159 jermar 47
#include <adt/btree.h>
788 jermar 48
#include <adt/list.h>
955 palkovsky 49
#include <ipc/ipc.h>
1174 jermar 50
#include <security/cap.h>
955 palkovsky 51
#include <memstr.h>
1060 palkovsky 52
#include <print.h>
2000 decky 53
#include <lib/elf.h>
1579 jermar 54
#include <errno.h>
1288 jermar 55
#include <syscall/copy.h>
1597 palkovsky 56
#include <console/klog.h>
973 palkovsky 57
 
1170 vana 58
#ifndef LOADED_PROG_STACK_PAGES_NO
59
#define LOADED_PROG_STACK_PAGES_NO 1
60
#endif
1168 vana 61
 
1636 jermar 62
/** Spinlock protecting the tasks_btree B+tree. */
623 jermar 63
SPINLOCK_INITIALIZE(tasks_lock);
1636 jermar 64
 
65
/** B+tree of active tasks.
66
 *
67
 * The task is guaranteed to exist after it was found in the tasks_btree as long as:
68
 * @li the tasks_lock is held,
69
 * @li the task's lock is held when task's lock is acquired before releasing tasks_lock or
1880 jermar 70
 * @li the task's refcount is greater than 0
1636 jermar 71
 *
72
 */
1159 jermar 73
btree_t tasks_btree;
1636 jermar 74
 
1005 palkovsky 75
static task_id_t task_counter = 0;
1 jermar 76
 
1585 jermar 77
static void ktaskclnp(void *arg);
1661 jermar 78
static void ktaskgc(void *arg);
1579 jermar 79
 
107 decky 80
/** Initialize tasks
81
 *
82
 * Initialize kernel tasks support.
83
 *
84
 */
1 jermar 85
void task_init(void)
86
{
15 jermar 87
    TASK = NULL;
1159 jermar 88
    btree_create(&tasks_btree);
1 jermar 89
}
90
 
107 decky 91
 
92
/** Create new task
93
 *
94
 * Create new task with no threads.
95
 *
703 jermar 96
 * @param as Task's address space.
1062 jermar 97
 * @param name Symbolic name.
107 decky 98
 *
973 palkovsky 99
 * @return New task's structure
107 decky 100
 *
101
 */
1062 jermar 102
task_t *task_create(as_t *as, char *name)
1 jermar 103
{
413 jermar 104
    ipl_t ipl;
1 jermar 105
    task_t *ta;
1040 palkovsky 106
    int i;
1 jermar 107
 
822 palkovsky 108
    ta = (task_t *) malloc(sizeof(task_t), 0);
109
 
1185 jermar 110
    task_create_arch(ta);
111
 
822 palkovsky 112
    spinlock_initialize(&ta->lock, "task_ta_lock");
113
    list_initialize(&ta->th_head);
114
    ta->as = as;
1062 jermar 115
    ta->name = name;
1585 jermar 116
    ta->main_thread = NULL;
1579 jermar 117
    ta->refcount = 0;
1839 decky 118
    ta->context = CONTEXT;
1579 jermar 119
 
1174 jermar 120
    ta->capabilities = 0;
1579 jermar 121
    ta->accept_new_threads = true;
2039 decky 122
    ta->cycles = 0;
1040 palkovsky 123
 
955 palkovsky 124
    ipc_answerbox_init(&ta->answerbox);
1839 decky 125
    for (i = 0; i < IPC_MAX_PHONES; i++)
1040 palkovsky 126
        ipc_phone_init(&ta->phones[i]);
1839 decky 127
    if ((ipc_phone_0) && (context_check(ipc_phone_0->task->context, ta->context)))
1040 palkovsky 128
        ipc_phone_connect(&ta->phones[0], ipc_phone_0);
998 palkovsky 129
    atomic_set(&ta->active_calls, 0);
1460 jermar 130
 
131
    mutex_initialize(&ta->futexes_lock);
132
    btree_create(&ta->futexes);
822 palkovsky 133
 
134
    ipl = interrupts_disable();
1468 jermar 135
 
136
    /*
137
     * Increment address space reference count.
138
     * TODO: Reconsider the locking scheme.
139
     */
140
    mutex_lock(&as->lock);
141
    as->refcount++;
142
    mutex_unlock(&as->lock);
143
 
822 palkovsky 144
    spinlock_lock(&tasks_lock);
1005 palkovsky 145
 
146
    ta->taskid = ++task_counter;
1177 jermar 147
    btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);
1005 palkovsky 148
 
822 palkovsky 149
    spinlock_unlock(&tasks_lock);
150
    interrupts_restore(ipl);
151
 
1 jermar 152
    return ta;
153
}
154
 
1579 jermar 155
/** Destroy task.
156
 *
157
 * @param t Task to be destroyed.
158
 */
159
void task_destroy(task_t *t)
160
{
1587 jermar 161
    task_destroy_arch(t);
162
    btree_destroy(&t->futexes);
163
 
164
    mutex_lock_active(&t->as->lock);
165
    if (--t->as->refcount == 0) {
166
        mutex_unlock(&t->as->lock);
167
        as_destroy(t->as);
168
        /*
169
         * t->as is destroyed.
170
         */
2040 decky 171
    } else
1587 jermar 172
        mutex_unlock(&t->as->lock);
173
 
2040 decky 174
    btree_remove(&tasks_btree, (btree_key_t) t->taskid, NULL); 
1587 jermar 175
    free(t);
176
    TASK = NULL;
1579 jermar 177
}
178
 
973 palkovsky 179
/** Create new task with 1 thread and run it
180
 *
1248 jermar 181
 * @param program_addr Address of program executable image.
1062 jermar 182
 * @param name Program name.
183
 *
1229 jermar 184
 * @return Task of the running program or NULL on error.
973 palkovsky 185
 */
1062 jermar 186
task_t * task_run_program(void *program_addr, char *name)
973 palkovsky 187
{
188
    as_t *as;
189
    as_area_t *a;
190
    int rc;
1585 jermar 191
    thread_t *t1, *t2;
973 palkovsky 192
    task_t *task;
1078 jermar 193
    uspace_arg_t *kernel_uarg;
973 palkovsky 194
 
195
    as = as_create(0);
1115 jermar 196
    ASSERT(as);
973 palkovsky 197
 
1025 palkovsky 198
    rc = elf_load((elf_header_t *) program_addr, as);
973 palkovsky 199
    if (rc != EE_OK) {
1468 jermar 200
        as_destroy(as);
973 palkovsky 201
        return NULL;
202
    }
203
 
1078 jermar 204
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
205
    kernel_uarg->uspace_entry = (void *) ((elf_header_t *) program_addr)->e_entry;
206
    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
207
    kernel_uarg->uspace_thread_function = NULL;
208
    kernel_uarg->uspace_thread_arg = NULL;
209
    kernel_uarg->uspace_uarg = NULL;
1066 jermar 210
 
1062 jermar 211
    task = task_create(as, name);
1115 jermar 212
    ASSERT(task);
213
 
973 palkovsky 214
    /*
215
     * Create the data as_area.
216
     */
1424 jermar 217
    a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
218
        LOADED_PROG_STACK_PAGES_NO*PAGE_SIZE,
1409 jermar 219
        USTACK_ADDRESS, AS_AREA_ATTR_NONE, &anon_backend, NULL);
1115 jermar 220
 
1585 jermar 221
    /*
222
     * Create the main thread.
223
     */
1864 jermar 224
    t1 = thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE, "uinit");
1585 jermar 225
    ASSERT(t1);
973 palkovsky 226
 
1585 jermar 227
    /*
228
     * Create killer thread for the new task.
229
     */
1661 jermar 230
    t2 = thread_create(ktaskgc, t1, task, 0, "ktaskgc");
1585 jermar 231
    ASSERT(t2);
232
    thread_ready(t2);
233
 
234
    thread_ready(t1);
235
 
973 palkovsky 236
    return task;
237
}
1060 palkovsky 238
 
1176 jermar 239
/** Syscall for reading task ID from userspace.
240
 *
1248 jermar 241
 * @param uspace_task_id Userspace address of 8-byte buffer where to store current task ID.
1176 jermar 242
 *
1288 jermar 243
 * @return 0 on success or an error code from @ref errno.h.
1176 jermar 244
 */
1780 jermar 245
unative_t sys_task_get_id(task_id_t *uspace_task_id)
1176 jermar 246
{
247
    /*
248
     * No need to acquire lock on TASK because taskid
249
     * remains constant for the lifespan of the task.
250
     */
1780 jermar 251
    return (unative_t) copy_to_uspace(uspace_task_id, &TASK->taskid, sizeof(TASK->taskid));
1176 jermar 252
}
253
 
1178 jermar 254
/** Find task structure corresponding to task ID.
255
 *
256
 * The tasks_lock must be already held by the caller of this function
257
 * and interrupts must be disabled.
258
 *
259
 * @param id Task ID.
260
 *
261
 * @return Task structure address or NULL if there is no such task ID.
262
 */
263
task_t *task_find_by_id(task_id_t id)
264
{
265
    btree_node_t *leaf;
266
 
267
    return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);
268
}
269
 
2039 decky 270
/** Get accounting data of given task.
271
 *
272
 * Note that task_lock on @t must be already held and
273
 * interrupts must be already disabled.
274
 *
275
 * @param t Pointer to thread.
276
 *
277
 */
278
uint64_t task_get_accounting(task_t *t)
279
{
280
    /* Accumulated value of task */
281
    uint64_t ret = t->cycles;
282
 
283
    /* Current values of threads */
284
    link_t *cur;
285
    for (cur = t->th_head.next; cur != &t->th_head; cur = cur->next) {
286
        thread_t *thr = list_get_instance(cur, thread_t, th_link);
287
 
288
        spinlock_lock(&thr->lock);
289
 
290
        if (thr == THREAD) /* Update accounting of current thread */
291
            thread_update_accounting();
292
        ret += thr->cycles;
293
 
294
        spinlock_unlock(&thr->lock);
295
    }
296
 
297
    return ret;
298
}
299
 
1579 jermar 300
/** Kill task.
301
 *
302
 * @param id ID of the task to be killed.
303
 *
304
 * @return 0 on success or an error code from errno.h
305
 */
306
int task_kill(task_id_t id)
307
{
308
    ipl_t ipl;
309
    task_t *ta;
310
    thread_t *t;
311
    link_t *cur;
1600 jermar 312
 
313
    if (id == 1)
314
        return EPERM;
1579 jermar 315
 
316
    ipl = interrupts_disable();
317
    spinlock_lock(&tasks_lock);
318
 
319
    if (!(ta = task_find_by_id(id))) {
320
        spinlock_unlock(&tasks_lock);
321
        interrupts_restore(ipl);
322
        return ENOENT;
323
    }
1588 jermar 324
 
1579 jermar 325
    spinlock_lock(&ta->lock);
326
    ta->refcount++;
327
    spinlock_unlock(&ta->lock);
1587 jermar 328
 
1588 jermar 329
    btree_remove(&tasks_btree, ta->taskid, NULL);
1587 jermar 330
    spinlock_unlock(&tasks_lock);
1579 jermar 331
 
1580 jermar 332
    t = thread_create(ktaskclnp, NULL, ta, 0, "ktaskclnp");
1579 jermar 333
 
334
    spinlock_lock(&ta->lock);
1580 jermar 335
    ta->accept_new_threads = false;
1579 jermar 336
    ta->refcount--;
1585 jermar 337
 
338
    /*
1687 jermar 339
     * Interrupt all threads except ktaskclnp.
1585 jermar 340
     */
1579 jermar 341
    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
342
        thread_t *thr;
343
        bool  sleeping = false;
344
 
345
        thr = list_get_instance(cur, thread_t, th_link);
346
        if (thr == t)
347
            continue;
348
 
349
        spinlock_lock(&thr->lock);
350
        thr->interrupted = true;
351
        if (thr->state == Sleeping)
352
            sleeping = true;
353
        spinlock_unlock(&thr->lock);
354
 
355
        if (sleeping)
356
            waitq_interrupt_sleep(thr);
357
    }
358
 
1580 jermar 359
    spinlock_unlock(&ta->lock);
360
    interrupts_restore(ipl);
1579 jermar 361
 
1580 jermar 362
    if (t)
363
        thread_ready(t);
364
 
1579 jermar 365
    return 0;
366
}
367
 
1060 palkovsky 368
/** Print task list */
369
void task_print_list(void)
370
{
371
    link_t *cur;
372
    ipl_t ipl;
373
 
374
    /* Messing with thread structures, avoid deadlock */
375
    ipl = interrupts_disable();
376
    spinlock_lock(&tasks_lock);
2035 decky 377
 
2039 decky 378
    printf("taskid name       ctx address    as         cycles     threads calls  callee\n");
379
    printf("------ ---------- --- ---------- ---------- ---------- ------- ------ ------>\n");
1060 palkovsky 380
 
1159 jermar 381
    for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head; cur = cur->next) {
382
        btree_node_t *node;
383
        int i;
384
 
385
        node = list_get_instance(cur, btree_node_t, leaf_link);
386
        for (i = 0; i < node->keys; i++) {
387
            task_t *t;
388
            int j;
389
 
390
            t = (task_t *) node->value[i];
391
 
392
            spinlock_lock(&t->lock);
2039 decky 393
 
394
            uint64_t cycles = task_get_accounting(t);
395
            char suffix;
396
 
397
            if (cycles > 1000000000000000000LL) {
398
                cycles = cycles / 1000000000000000000LL;
399
                suffix = 'E';
400
            } else if (cycles > 1000000000000LL) {
401
                cycles = cycles / 1000000000000LL;
402
                suffix = 'T';
403
            } else if (cycles > 1000000LL) {
404
                cycles = cycles / 1000000LL;
405
                suffix = 'M';
406
            } else
407
                suffix = ' ';
408
 
409
            printf("%-6lld %-10s %-3ld %#10zx %#10zx %9llu%c %7zd %6zd", t->taskid, t->name, t->context, t, t->as, cycles, suffix, t->refcount, atomic_get(&t->active_calls));
2035 decky 410
            for (j = 0; j < IPC_MAX_PHONES; j++) {
1159 jermar 411
                if (t->phones[j].callee)
2035 decky 412
                    printf(" %zd:%#zx", j, t->phones[j].callee);
1159 jermar 413
            }
414
            printf("\n");
2039 decky 415
 
1159 jermar 416
            spinlock_unlock(&t->lock);
1060 palkovsky 417
        }
418
    }
419
 
420
    spinlock_unlock(&tasks_lock);
421
    interrupts_restore(ipl);
422
}
1579 jermar 423
 
1585 jermar 424
/** Kernel thread used to cleanup the task after it is killed. */
1580 jermar 425
void ktaskclnp(void *arg)
1579 jermar 426
{
1580 jermar 427
    ipl_t ipl;
1585 jermar 428
    thread_t *t = NULL, *main_thread;
1580 jermar 429
    link_t *cur;
1661 jermar 430
    bool again;
1580 jermar 431
 
432
    thread_detach(THREAD);
433
 
434
loop:
435
    ipl = interrupts_disable();
436
    spinlock_lock(&TASK->lock);
437
 
1585 jermar 438
    main_thread = TASK->main_thread;
439
 
1579 jermar 440
    /*
1580 jermar 441
     * Find a thread to join.
442
     */
1661 jermar 443
    again = false;
1580 jermar 444
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
445
        t = list_get_instance(cur, thread_t, th_link);
1661 jermar 446
 
447
        spinlock_lock(&t->lock);
448
        if (t == THREAD) {
449
            spinlock_unlock(&t->lock);
1580 jermar 450
            continue;
1661 jermar 451
        } else if (t == main_thread) {
452
            spinlock_unlock(&t->lock);
1585 jermar 453
            continue;
1661 jermar 454
        } else if (t->join_type != None) {
455
            spinlock_unlock(&t->lock);
456
            again = true;
457
            continue;
458
        } else {
459
            t->join_type = TaskClnp;
460
            spinlock_unlock(&t->lock);
461
            again = false;
1580 jermar 462
            break;
1661 jermar 463
        }
1580 jermar 464
    }
465
 
466
    spinlock_unlock(&TASK->lock);
467
    interrupts_restore(ipl);
468
 
1661 jermar 469
    if (again) {
470
        /*
471
         * Other cleanup (e.g. ktaskgc) is in progress.
472
         */
473
        scheduler();
474
        goto loop;
475
    }
476
 
1580 jermar 477
    if (t != THREAD) {
1661 jermar 478
        ASSERT(t != main_thread);   /* uninit is joined and detached in ktaskgc */
1580 jermar 479
        thread_join(t);
480
        thread_detach(t);
1585 jermar 481
        goto loop;  /* go for another thread */
1580 jermar 482
    }
483
 
484
    /*
485
     * Now there are no other threads in this task
486
     * and no new threads can be created.
487
     */
1880 jermar 488
 
1583 jermar 489
    ipc_cleanup();
490
    futex_cleanup();
1597 palkovsky 491
    klog_printf("Cleanup of task %lld completed.", TASK->taskid);
1579 jermar 492
}
1585 jermar 493
 
1684 jermar 494
/** Kernel thread used to kill the userspace task when its main thread exits.
1585 jermar 495
 *
496
 * This thread waits until the main userspace thread (i.e. uninit) exits.
1661 jermar 497
 * When this happens, the task is killed. In the meantime, exited threads
498
 * are garbage collected.
1585 jermar 499
 *
500
 * @param arg Pointer to the thread structure of the task's main thread.
501
 */
1661 jermar 502
void ktaskgc(void *arg)
1585 jermar 503
{
504
    thread_t *t = (thread_t *) arg;
1661 jermar 505
loop:  
1585 jermar 506
    /*
507
     * Userspace threads cannot detach themselves,
508
     * therefore the thread pointer is guaranteed to be valid.
509
     */
1661 jermar 510
    if (thread_join_timeout(t, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) {  /* sleep uninterruptibly here! */
511
        ipl_t ipl;
512
        link_t *cur;
513
        thread_t *thr = NULL;
514
 
515
        /*
516
         * The join timed out. Try to do some garbage collection of Undead threads.
517
         */
518
more_gc:       
519
        ipl = interrupts_disable();
520
        spinlock_lock(&TASK->lock);
521
 
522
        for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
523
            thr = list_get_instance(cur, thread_t, th_link);
524
            spinlock_lock(&thr->lock);
1687 jermar 525
            if (thr != t && thr->state == Undead && thr->join_type == None) {
1661 jermar 526
                thr->join_type = TaskGC;
527
                spinlock_unlock(&thr->lock);
528
                break;
529
            }
530
            spinlock_unlock(&thr->lock);
531
            thr = NULL;
532
        }
533
        spinlock_unlock(&TASK->lock);
1676 jermar 534
        interrupts_restore(ipl);
1661 jermar 535
 
536
        if (thr) {
537
            thread_join(thr);
538
            thread_detach(thr);
539
            scheduler();
540
            goto more_gc;
541
        }
542
 
543
        goto loop;
544
    }
1585 jermar 545
    thread_detach(t);
546
    task_kill(TASK->taskid);
547
}
1702 cejka 548
 
1757 jermar 549
/** @}
1702 cejka 550
 */