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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
 
29
#include <proc/scheduler.h>
30
#include <proc/thread.h>
31
#include <proc/task.h>
1078 jermar 32
#include <proc/uarg.h>
1 jermar 33
#include <mm/frame.h>
34
#include <mm/page.h>
35
#include <arch/asm.h>
36
#include <arch.h>
37
#include <synch/synch.h>
38
#include <synch/spinlock.h>
39
#include <synch/waitq.h>
40
#include <synch/rwlock.h>
41
#include <cpu.h>
42
#include <func.h>
43
#include <context.h>
1158 jermar 44
#include <adt/btree.h>
788 jermar 45
#include <adt/list.h>
1 jermar 46
#include <typedefs.h>
47
#include <time/clock.h>
788 jermar 48
#include <adt/list.h>
7 jermar 49
#include <config.h>
50
#include <arch/interrupt.h>
10 jermar 51
#include <smp/ipi.h>
76 jermar 52
#include <arch/faddr.h>
1104 jermar 53
#include <atomic.h>
195 vana 54
#include <memstr.h>
777 palkovsky 55
#include <print.h>
787 palkovsky 56
#include <mm/slab.h>
57
#include <debug.h>
1066 jermar 58
#include <main/uinit.h>
7 jermar 59
 
107 decky 60
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 61
 
1158 jermar 62
/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
63
SPINLOCK_INITIALIZE(threads_lock);
64
btree_t threads_btree;          /**< B+tree of all threads. */
1 jermar 65
 
623 jermar 66
SPINLOCK_INITIALIZE(tidlock);
1 jermar 67
__u32 last_tid = 0;
68
 
787 palkovsky 69
static slab_cache_t *thread_slab;
906 palkovsky 70
#ifdef ARCH_HAS_FPU
71
slab_cache_t *fpu_context_slab;
72
#endif
107 decky 73
 
74
/** Thread wrapper
75
 *
76
 * This wrapper is provided to ensure that every thread
1 jermar 77
 * makes a call to thread_exit() when its implementing
78
 * function returns.
79
 *
413 jermar 80
 * interrupts_disable() is assumed.
107 decky 81
 *
1 jermar 82
 */
452 decky 83
static void cushion(void)
1 jermar 84
{
15 jermar 85
    void (*f)(void *) = THREAD->thread_code;
86
    void *arg = THREAD->thread_arg;
1 jermar 87
 
213 jermar 88
    /* this is where each thread wakes up after its creation */
15 jermar 89
    spinlock_unlock(&THREAD->lock);
413 jermar 90
    interrupts_enable();
1 jermar 91
 
92
    f(arg);
93
    thread_exit();
94
    /* not reached */
95
}
96
 
787 palkovsky 97
/** Initialization and allocation for thread_t structure */
98
static int thr_constructor(void *obj, int kmflags)
99
{
100
    thread_t *t = (thread_t *)obj;
814 palkovsky 101
    pfn_t pfn;
842 palkovsky 102
    int status;
107 decky 103
 
787 palkovsky 104
    spinlock_initialize(&t->lock, "thread_t_lock");
105
    link_initialize(&t->rq_link);
106
    link_initialize(&t->wq_link);
107
    link_initialize(&t->th_link);
108
 
906 palkovsky 109
#ifdef ARCH_HAS_FPU
110
#  ifdef CONFIG_FPU_LAZY
111
    t->saved_fpu_context = NULL;
112
#  else
113
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
114
    if (!t->saved_fpu_context)
115
        return -1;
116
#  endif
117
#endif  
118
 
935 vana 119
    pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
906 palkovsky 120
    if (status) {
121
#ifdef ARCH_HAS_FPU
122
        if (t->saved_fpu_context)
123
            slab_free(fpu_context_slab,t->saved_fpu_context);
124
#endif
842 palkovsky 125
        return -1;
906 palkovsky 126
    }
814 palkovsky 127
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
787 palkovsky 128
 
129
    return 0;
130
}
131
 
132
/** Destruction of thread_t object */
133
static int thr_destructor(void *obj)
134
{
135
    thread_t *t = (thread_t *)obj;
136
 
814 palkovsky 137
    frame_free(ADDR2PFN(KA2PA(t->kstack)));
906 palkovsky 138
#ifdef ARCH_HAS_FPU
139
    if (t->saved_fpu_context)
140
        slab_free(fpu_context_slab,t->saved_fpu_context);
141
#endif
787 palkovsky 142
    return 1; /* One page freed */
143
}
144
 
107 decky 145
/** Initialize threads
146
 *
147
 * Initialize kernel threads support.
148
 *
149
 */
1 jermar 150
void thread_init(void)
151
{
15 jermar 152
    THREAD = NULL;
625 palkovsky 153
    atomic_set(&nrdy,0);
787 palkovsky 154
    thread_slab = slab_cache_create("thread_slab",
155
                    sizeof(thread_t),0,
156
                    thr_constructor, thr_destructor, 0);
906 palkovsky 157
#ifdef ARCH_HAS_FPU
158
    fpu_context_slab = slab_cache_create("fpu_slab",
159
                         sizeof(fpu_context_t),
160
                         FPU_CONTEXT_ALIGN,
161
                         NULL, NULL, 0);
162
#endif
1158 jermar 163
 
164
    btree_create(&threads_btree);
1 jermar 165
}
166
 
107 decky 167
/** Make thread ready
168
 *
169
 * Switch thread t to the ready state.
170
 *
171
 * @param t Thread to make ready.
172
 *
173
 */
1 jermar 174
void thread_ready(thread_t *t)
175
{
176
    cpu_t *cpu;
177
    runq_t *r;
413 jermar 178
    ipl_t ipl;
625 palkovsky 179
    int i, avg;
1 jermar 180
 
413 jermar 181
    ipl = interrupts_disable();
1 jermar 182
 
183
    spinlock_lock(&t->lock);
184
 
1086 palkovsky 185
    ASSERT(! (t->state == Ready));
186
 
413 jermar 187
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 188
 
16 jermar 189
    cpu = CPU;
1 jermar 190
    if (t->flags & X_WIRED) {
191
        cpu = t->cpu;
192
    }
1083 palkovsky 193
    t->state = Ready;
1 jermar 194
    spinlock_unlock(&t->lock);
195
 
107 decky 196
    /*
1 jermar 197
     * Append t to respective ready queue on respective processor.
198
     */
199
    r = &cpu->rq[i];
200
    spinlock_lock(&r->lock);
201
    list_append(&t->rq_link, &r->rq_head);
202
    r->n++;
203
    spinlock_unlock(&r->lock);
204
 
475 jermar 205
    atomic_inc(&nrdy);
625 palkovsky 206
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 207
    atomic_inc(&cpu->nrdy);
1 jermar 208
 
413 jermar 209
    interrupts_restore(ipl);
1 jermar 210
}
211
 
787 palkovsky 212
/** Destroy thread memory structure
213
 *
214
 * Detach thread from all queues, cpus etc. and destroy it.
215
 *
216
 * Assume thread->lock is held!!
217
 */
218
void thread_destroy(thread_t *t)
219
{
220
    ASSERT(t->state == Exiting);
221
    ASSERT(t->task);
222
    ASSERT(t->cpu);
223
 
224
    spinlock_lock(&t->cpu->lock);
225
    if(t->cpu->fpu_owner==t)
226
        t->cpu->fpu_owner=NULL;
227
    spinlock_unlock(&t->cpu->lock);
228
 
229
    /*
230
     * Detach from the containing task.
231
     */
232
    spinlock_lock(&t->task->lock);
233
    list_remove(&t->th_link);
234
    spinlock_unlock(&t->task->lock);
235
 
236
    spinlock_unlock(&t->lock);
237
 
238
    spinlock_lock(&threads_lock);
1177 jermar 239
    btree_remove(&threads_btree, (btree_key_t) ((__address ) t), NULL);
787 palkovsky 240
    spinlock_unlock(&threads_lock);
241
 
242
    slab_free(thread_slab, t);
243
}
244
 
107 decky 245
/** Create new thread
246
 *
247
 * Create a new thread.
248
 *
249
 * @param func  Thread's implementing function.
250
 * @param arg   Thread's implementing function argument.
251
 * @param task  Task to which the thread belongs.
252
 * @param flags Thread flags.
1062 jermar 253
 * @param name  Symbolic name.
107 decky 254
 *
255
 * @return New thread's structure on success, NULL on failure.
256
 *
257
 */
1062 jermar 258
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name)
1 jermar 259
{
260
    thread_t *t;
822 palkovsky 261
    ipl_t ipl;
262
 
787 palkovsky 263
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 264
    if (!t)
265
        return NULL;
1171 jermar 266
 
267
    thread_create_arch(t);
1 jermar 268
 
822 palkovsky 269
    /* Not needed, but good for debugging */
1138 jermar 270
    memsetb((__address)t->kstack, THREAD_STACK_SIZE * 1<<STACK_FRAMES, 0);
822 palkovsky 271
 
272
    ipl = interrupts_disable();
273
    spinlock_lock(&tidlock);
274
    t->tid = ++last_tid;
275
    spinlock_unlock(&tidlock);
276
    interrupts_restore(ipl);
277
 
278
    context_save(&t->saved_context);
279
    context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
280
 
281
    the_initialize((the_t *) t->kstack);
282
 
283
    ipl = interrupts_disable();
284
    t->saved_context.ipl = interrupts_read();
285
    interrupts_restore(ipl);
286
 
1066 jermar 287
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
288
 
822 palkovsky 289
    t->thread_code = func;
290
    t->thread_arg = arg;
291
    t->ticks = -1;
292
    t->priority = -1;       /* start in rq[0] */
293
    t->cpu = NULL;
294
    t->flags = 0;
295
    t->state = Entering;
296
    t->call_me = NULL;
297
    t->call_me_with = NULL;
298
 
299
    timeout_initialize(&t->sleep_timeout);
300
    t->sleep_queue = NULL;
301
    t->timeout_pending = 0;
302
 
303
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 304
 
822 palkovsky 305
    t->task = task;
306
 
860 decky 307
    t->fpu_context_exists = 0;
308
    t->fpu_context_engaged = 0;
822 palkovsky 309
 
310
    /*
311
     * Register this thread in the system-wide list.
312
     */
313
    ipl = interrupts_disable();
314
    spinlock_lock(&threads_lock);
1177 jermar 315
    btree_insert(&threads_btree, (btree_key_t) ((__address) t), (void *) t, NULL);
822 palkovsky 316
    spinlock_unlock(&threads_lock);
317
 
318
    /*
319
     * Attach to the containing task.
320
     */
321
    spinlock_lock(&task->lock);
322
    list_append(&t->th_link, &task->th_head);
323
    spinlock_unlock(&task->lock);
324
 
325
    interrupts_restore(ipl);
860 decky 326
 
1 jermar 327
    return t;
328
}
329
 
107 decky 330
/** Make thread exiting
331
 *
332
 * End current thread execution and switch it to the exiting
333
 * state. All pending timeouts are executed.
334
 *
335
 */
1 jermar 336
void thread_exit(void)
337
{
413 jermar 338
    ipl_t ipl;
1 jermar 339
 
340
restart:
413 jermar 341
    ipl = interrupts_disable();
15 jermar 342
    spinlock_lock(&THREAD->lock);
343
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
344
        spinlock_unlock(&THREAD->lock);
413 jermar 345
        interrupts_restore(ipl);
1 jermar 346
        goto restart;
347
    }
15 jermar 348
    THREAD->state = Exiting;
349
    spinlock_unlock(&THREAD->lock);
1 jermar 350
    scheduler();
351
}
352
 
107 decky 353
 
354
/** Thread sleep
355
 *
356
 * Suspend execution of the current thread.
357
 *
358
 * @param sec Number of seconds to sleep.
359
 *
360
 */
1 jermar 361
void thread_sleep(__u32 sec)
362
{
125 jermar 363
    thread_usleep(sec*1000000);
1 jermar 364
}
107 decky 365
 
366
/** Thread usleep
367
 *
368
 * Suspend execution of the current thread.
369
 *
370
 * @param usec Number of microseconds to sleep.
371
 *
372
 */
1 jermar 373
void thread_usleep(__u32 usec)
374
{
375
    waitq_t wq;
376
 
377
    waitq_initialize(&wq);
378
 
379
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
380
}
381
 
107 decky 382
/** Register thread out-of-context invocation
383
 *
384
 * Register a function and its argument to be executed
385
 * on next context switch to the current thread.
386
 *
387
 * @param call_me      Out-of-context function.
388
 * @param call_me_with Out-of-context function argument.
389
 *
390
 */
1 jermar 391
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
392
{
413 jermar 393
    ipl_t ipl;
1 jermar 394
 
413 jermar 395
    ipl = interrupts_disable();
15 jermar 396
    spinlock_lock(&THREAD->lock);
397
    THREAD->call_me = call_me;
398
    THREAD->call_me_with = call_me_with;
399
    spinlock_unlock(&THREAD->lock);
413 jermar 400
    interrupts_restore(ipl);
1 jermar 401
}
777 palkovsky 402
 
403
/** Print list of threads debug info */
404
void thread_print_list(void)
405
{
406
    link_t *cur;
407
    ipl_t ipl;
408
 
409
    /* Messing with thread structures, avoid deadlock */
410
    ipl = interrupts_disable();
411
    spinlock_lock(&threads_lock);
412
 
1158 jermar 413
    for (cur = threads_btree.leaf_head.next; cur != &threads_btree.leaf_head; cur = cur->next) {
414
        btree_node_t *node;
415
        int i;
416
 
417
        node = list_get_instance(cur, btree_node_t, leaf_link);
418
        for (i = 0; i < node->keys; i++) {
419
            thread_t *t;
420
 
421
            t = (thread_t *) node->value[i];
422
            printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
423
                t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
424
            if (t->cpu)
425
                printf("cpu%d ", t->cpu->id);
426
            else
427
                printf("none");
428
            printf("\n");
429
        }
777 palkovsky 430
    }
431
 
432
    spinlock_unlock(&threads_lock);
1060 palkovsky 433
    interrupts_restore(ipl);
777 palkovsky 434
}
1066 jermar 435
 
1158 jermar 436
/** Check whether thread exists.
437
 *
438
 * Note that threads_lock must be already held and
439
 * interrupts must be already disabled.
440
 *
441
 * @param t Pointer to thread.
442
 *
443
 * @return True if thread t is known to the system, false otherwise.
444
 */
445
bool thread_exists(thread_t *t)
446
{
447
    btree_node_t *leaf;
448
 
1177 jermar 449
    return btree_search(&threads_btree, (btree_key_t) ((__address) t), &leaf) != NULL;
1158 jermar 450
}
451
 
1066 jermar 452
/** Process syscall to create new thread.
453
 *
454
 */
1078 jermar 455
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
1066 jermar 456
{
457
        thread_t *t;
458
        char namebuf[THREAD_NAME_BUFLEN];
1103 jermar 459
    uspace_arg_t *kernel_uarg;
1066 jermar 460
    __u32 tid;
461
 
1078 jermar 462
        copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
1066 jermar 463
 
1078 jermar 464
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
465
    copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
466
 
467
        if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
1066 jermar 468
        tid = t->tid;
469
                thread_ready(t);
470
        return (__native) tid;
471
        } else {
1078 jermar 472
        free(kernel_uarg);
1066 jermar 473
        }
474
 
475
        return (__native) -1;
476
}
477
 
478
/** Process syscall to terminate thread.
479
 *
480
 */
1078 jermar 481
__native sys_thread_exit(int uspace_status)
1066 jermar 482
{
483
        thread_exit();
484
        /* Unreachable */
485
        return 0;
486
}