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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>
32
#include <mm/frame.h>
33
#include <mm/page.h>
34
#include <arch/asm.h>
35
#include <arch.h>
36
#include <synch/synch.h>
37
#include <synch/spinlock.h>
38
#include <synch/waitq.h>
39
#include <synch/rwlock.h>
40
#include <cpu.h>
41
#include <func.h>
42
#include <context.h>
788 jermar 43
#include <adt/list.h>
1 jermar 44
#include <typedefs.h>
45
#include <time/clock.h>
788 jermar 46
#include <adt/list.h>
7 jermar 47
#include <config.h>
48
#include <arch/interrupt.h>
10 jermar 49
#include <smp/ipi.h>
76 jermar 50
#include <arch/faddr.h>
111 palkovsky 51
#include <arch/atomic.h>
195 vana 52
#include <memstr.h>
777 palkovsky 53
#include <print.h>
787 palkovsky 54
#include <mm/slab.h>
55
#include <debug.h>
7 jermar 56
 
107 decky 57
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 58
 
623 jermar 59
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
624 jermar 60
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
1 jermar 61
 
623 jermar 62
SPINLOCK_INITIALIZE(tidlock);
1 jermar 63
__u32 last_tid = 0;
64
 
787 palkovsky 65
static slab_cache_t *thread_slab;
107 decky 66
 
787 palkovsky 67
 
107 decky 68
/** Thread wrapper
69
 *
70
 * This wrapper is provided to ensure that every thread
1 jermar 71
 * makes a call to thread_exit() when its implementing
72
 * function returns.
73
 *
413 jermar 74
 * interrupts_disable() is assumed.
107 decky 75
 *
1 jermar 76
 */
452 decky 77
static void cushion(void)
1 jermar 78
{
15 jermar 79
    void (*f)(void *) = THREAD->thread_code;
80
    void *arg = THREAD->thread_arg;
1 jermar 81
 
213 jermar 82
    /* this is where each thread wakes up after its creation */
22 jermar 83
    before_thread_runs();
84
 
15 jermar 85
    spinlock_unlock(&THREAD->lock);
413 jermar 86
    interrupts_enable();
1 jermar 87
 
88
    f(arg);
89
    thread_exit();
90
    /* not reached */
91
}
92
 
787 palkovsky 93
/** Initialization and allocation for thread_t structure */
94
static int thr_constructor(void *obj, int kmflags)
95
{
96
    thread_t *t = (thread_t *)obj;
814 palkovsky 97
    pfn_t pfn;
842 palkovsky 98
    int status;
107 decky 99
 
787 palkovsky 100
    spinlock_initialize(&t->lock, "thread_t_lock");
101
    link_initialize(&t->rq_link);
102
    link_initialize(&t->wq_link);
103
    link_initialize(&t->th_link);
104
    link_initialize(&t->threads_link);
105
 
842 palkovsky 106
    pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA | kmflags,&status);
107
    if (status)
108
        return -1;
814 palkovsky 109
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
787 palkovsky 110
 
111
    return 0;
112
}
113
 
114
/** Destruction of thread_t object */
115
static int thr_destructor(void *obj)
116
{
117
    thread_t *t = (thread_t *)obj;
118
 
814 palkovsky 119
    frame_free(ADDR2PFN(KA2PA(t->kstack)));
787 palkovsky 120
    return 1; /* One page freed */
121
}
122
 
107 decky 123
/** Initialize threads
124
 *
125
 * Initialize kernel threads support.
126
 *
127
 */
1 jermar 128
void thread_init(void)
129
{
15 jermar 130
    THREAD = NULL;
625 palkovsky 131
    atomic_set(&nrdy,0);
787 palkovsky 132
    thread_slab = slab_cache_create("thread_slab",
133
                    sizeof(thread_t),0,
134
                    thr_constructor, thr_destructor, 0);
1 jermar 135
}
136
 
107 decky 137
 
138
/** Make thread ready
139
 *
140
 * Switch thread t to the ready state.
141
 *
142
 * @param t Thread to make ready.
143
 *
144
 */
1 jermar 145
void thread_ready(thread_t *t)
146
{
147
    cpu_t *cpu;
148
    runq_t *r;
413 jermar 149
    ipl_t ipl;
625 palkovsky 150
    int i, avg;
1 jermar 151
 
413 jermar 152
    ipl = interrupts_disable();
1 jermar 153
 
154
    spinlock_lock(&t->lock);
155
 
413 jermar 156
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 157
 
16 jermar 158
    cpu = CPU;
1 jermar 159
    if (t->flags & X_WIRED) {
160
        cpu = t->cpu;
161
    }
162
    spinlock_unlock(&t->lock);
163
 
107 decky 164
    /*
1 jermar 165
     * Append t to respective ready queue on respective processor.
166
     */
167
    r = &cpu->rq[i];
168
    spinlock_lock(&r->lock);
169
    list_append(&t->rq_link, &r->rq_head);
170
    r->n++;
171
    spinlock_unlock(&r->lock);
172
 
475 jermar 173
    atomic_inc(&nrdy);
625 palkovsky 174
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 175
    atomic_inc(&cpu->nrdy);
1 jermar 176
 
413 jermar 177
    interrupts_restore(ipl);
1 jermar 178
}
179
 
107 decky 180
 
787 palkovsky 181
/** Destroy thread memory structure
182
 *
183
 * Detach thread from all queues, cpus etc. and destroy it.
184
 *
185
 * Assume thread->lock is held!!
186
 */
187
void thread_destroy(thread_t *t)
188
{
189
    ASSERT(t->state == Exiting);
190
    ASSERT(t->task);
191
    ASSERT(t->cpu);
192
 
193
    spinlock_lock(&t->cpu->lock);
194
    if(t->cpu->fpu_owner==t)
195
        t->cpu->fpu_owner=NULL;
196
    spinlock_unlock(&t->cpu->lock);
197
 
198
    /*
199
     * Detach from the containing task.
200
     */
201
    spinlock_lock(&t->task->lock);
202
    list_remove(&t->th_link);
203
    spinlock_unlock(&t->task->lock);
204
 
205
    spinlock_unlock(&t->lock);
206
 
207
    spinlock_lock(&threads_lock);
208
    list_remove(&t->threads_link);
209
    spinlock_unlock(&threads_lock);
210
 
211
    slab_free(thread_slab, t);
212
}
213
 
214
 
107 decky 215
/** Create new thread
216
 *
217
 * Create a new thread.
218
 *
219
 * @param func  Thread's implementing function.
220
 * @param arg   Thread's implementing function argument.
221
 * @param task  Task to which the thread belongs.
222
 * @param flags Thread flags.
223
 *
224
 * @return New thread's structure on success, NULL on failure.
225
 *
226
 */
1 jermar 227
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
228
{
229
    thread_t *t;
822 palkovsky 230
    ipl_t ipl;
231
 
787 palkovsky 232
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 233
    if (!t)
234
        return NULL;
1 jermar 235
 
822 palkovsky 236
    /* Not needed, but good for debugging */
237
    memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
238
 
239
    ipl = interrupts_disable();
240
    spinlock_lock(&tidlock);
241
    t->tid = ++last_tid;
242
    spinlock_unlock(&tidlock);
243
    interrupts_restore(ipl);
244
 
245
    context_save(&t->saved_context);
246
    context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
247
 
248
    the_initialize((the_t *) t->kstack);
249
 
250
    ipl = interrupts_disable();
251
    t->saved_context.ipl = interrupts_read();
252
    interrupts_restore(ipl);
253
 
254
    t->thread_code = func;
255
    t->thread_arg = arg;
256
    t->ticks = -1;
257
    t->priority = -1;       /* start in rq[0] */
258
    t->cpu = NULL;
259
    t->flags = 0;
260
    t->state = Entering;
261
    t->call_me = NULL;
262
    t->call_me_with = NULL;
263
 
264
    timeout_initialize(&t->sleep_timeout);
265
    t->sleep_queue = NULL;
266
    t->timeout_pending = 0;
267
 
268
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 269
 
822 palkovsky 270
    t->task = task;
271
 
860 decky 272
    t->fpu_context_exists = 0;
273
    t->fpu_context_engaged = 0;
822 palkovsky 274
 
275
    /*
276
     * Register this thread in the system-wide list.
277
     */
278
    ipl = interrupts_disable();
279
    spinlock_lock(&threads_lock);
280
    list_append(&t->threads_link, &threads_head);
281
    spinlock_unlock(&threads_lock);
282
 
283
    /*
284
     * Attach to the containing task.
285
     */
286
    spinlock_lock(&task->lock);
287
    list_append(&t->th_link, &task->th_head);
288
    spinlock_unlock(&task->lock);
289
 
290
    interrupts_restore(ipl);
860 decky 291
 
1 jermar 292
    return t;
293
}
294
 
107 decky 295
 
296
/** Make thread exiting
297
 *
298
 * End current thread execution and switch it to the exiting
299
 * state. All pending timeouts are executed.
300
 *
301
 */
1 jermar 302
void thread_exit(void)
303
{
413 jermar 304
    ipl_t ipl;
1 jermar 305
 
306
restart:
413 jermar 307
    ipl = interrupts_disable();
15 jermar 308
    spinlock_lock(&THREAD->lock);
309
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
310
        spinlock_unlock(&THREAD->lock);
413 jermar 311
        interrupts_restore(ipl);
1 jermar 312
        goto restart;
313
    }
15 jermar 314
    THREAD->state = Exiting;
315
    spinlock_unlock(&THREAD->lock);
1 jermar 316
    scheduler();
317
}
318
 
107 decky 319
 
320
/** Thread sleep
321
 *
322
 * Suspend execution of the current thread.
323
 *
324
 * @param sec Number of seconds to sleep.
325
 *
326
 */
1 jermar 327
void thread_sleep(__u32 sec)
328
{
125 jermar 329
    thread_usleep(sec*1000000);
1 jermar 330
}
107 decky 331
 
332
 
333
/** Thread usleep
334
 *
335
 * Suspend execution of the current thread.
336
 *
337
 * @param usec Number of microseconds to sleep.
338
 *
339
 */
1 jermar 340
void thread_usleep(__u32 usec)
341
{
342
    waitq_t wq;
343
 
344
    waitq_initialize(&wq);
345
 
346
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
347
}
348
 
107 decky 349
 
350
/** Register thread out-of-context invocation
351
 *
352
 * Register a function and its argument to be executed
353
 * on next context switch to the current thread.
354
 *
355
 * @param call_me      Out-of-context function.
356
 * @param call_me_with Out-of-context function argument.
357
 *
358
 */
1 jermar 359
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
360
{
413 jermar 361
    ipl_t ipl;
1 jermar 362
 
413 jermar 363
    ipl = interrupts_disable();
15 jermar 364
    spinlock_lock(&THREAD->lock);
365
    THREAD->call_me = call_me;
366
    THREAD->call_me_with = call_me_with;
367
    spinlock_unlock(&THREAD->lock);
413 jermar 368
    interrupts_restore(ipl);
1 jermar 369
}
777 palkovsky 370
 
371
/** Print list of threads debug info */
372
void thread_print_list(void)
373
{
374
    link_t *cur;
375
    thread_t *t;
376
    ipl_t ipl;
377
 
378
    /* Messing with thread structures, avoid deadlock */
379
    ipl = interrupts_disable();
380
    spinlock_lock(&threads_lock);
381
 
382
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
383
        t = list_get_instance(cur, thread_t, threads_link);
384
        printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
385
        if (t->cpu)
386
            printf("cpu%d ", t->cpu->id);
387
 
388
        printf("\n");
389
    }
390
 
391
    spinlock_unlock(&threads_lock);
392
    interrupts_enable();
393
}