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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;
906 palkovsky 66
#ifdef ARCH_HAS_FPU
67
slab_cache_t *fpu_context_slab;
68
#endif
107 decky 69
 
787 palkovsky 70
 
107 decky 71
/** Thread wrapper
72
 *
73
 * This wrapper is provided to ensure that every thread
1 jermar 74
 * makes a call to thread_exit() when its implementing
75
 * function returns.
76
 *
413 jermar 77
 * interrupts_disable() is assumed.
107 decky 78
 *
1 jermar 79
 */
452 decky 80
static void cushion(void)
1 jermar 81
{
15 jermar 82
    void (*f)(void *) = THREAD->thread_code;
83
    void *arg = THREAD->thread_arg;
1 jermar 84
 
213 jermar 85
    /* this is where each thread wakes up after its creation */
22 jermar 86
    before_thread_runs();
87
 
15 jermar 88
    spinlock_unlock(&THREAD->lock);
413 jermar 89
    interrupts_enable();
1 jermar 90
 
91
    f(arg);
92
    thread_exit();
93
    /* not reached */
94
}
95
 
787 palkovsky 96
/** Initialization and allocation for thread_t structure */
97
static int thr_constructor(void *obj, int kmflags)
98
{
99
    thread_t *t = (thread_t *)obj;
814 palkovsky 100
    pfn_t pfn;
842 palkovsky 101
    int status;
107 decky 102
 
787 palkovsky 103
    spinlock_initialize(&t->lock, "thread_t_lock");
104
    link_initialize(&t->rq_link);
105
    link_initialize(&t->wq_link);
106
    link_initialize(&t->th_link);
107
    link_initialize(&t->threads_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
 
842 palkovsky 119
    pfn = frame_alloc_rc(ONE_FRAME, 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
1 jermar 163
}
164
 
107 decky 165
 
166
/** Make thread ready
167
 *
168
 * Switch thread t to the ready state.
169
 *
170
 * @param t Thread to make ready.
171
 *
172
 */
1 jermar 173
void thread_ready(thread_t *t)
174
{
175
    cpu_t *cpu;
176
    runq_t *r;
413 jermar 177
    ipl_t ipl;
625 palkovsky 178
    int i, avg;
1 jermar 179
 
413 jermar 180
    ipl = interrupts_disable();
1 jermar 181
 
182
    spinlock_lock(&t->lock);
183
 
413 jermar 184
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 185
 
16 jermar 186
    cpu = CPU;
1 jermar 187
    if (t->flags & X_WIRED) {
188
        cpu = t->cpu;
189
    }
190
    spinlock_unlock(&t->lock);
191
 
107 decky 192
    /*
1 jermar 193
     * Append t to respective ready queue on respective processor.
194
     */
195
    r = &cpu->rq[i];
196
    spinlock_lock(&r->lock);
197
    list_append(&t->rq_link, &r->rq_head);
198
    r->n++;
199
    spinlock_unlock(&r->lock);
200
 
475 jermar 201
    atomic_inc(&nrdy);
625 palkovsky 202
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 203
    atomic_inc(&cpu->nrdy);
1 jermar 204
 
413 jermar 205
    interrupts_restore(ipl);
1 jermar 206
}
207
 
107 decky 208
 
787 palkovsky 209
/** Destroy thread memory structure
210
 *
211
 * Detach thread from all queues, cpus etc. and destroy it.
212
 *
213
 * Assume thread->lock is held!!
214
 */
215
void thread_destroy(thread_t *t)
216
{
217
    ASSERT(t->state == Exiting);
218
    ASSERT(t->task);
219
    ASSERT(t->cpu);
220
 
221
    spinlock_lock(&t->cpu->lock);
222
    if(t->cpu->fpu_owner==t)
223
        t->cpu->fpu_owner=NULL;
224
    spinlock_unlock(&t->cpu->lock);
225
 
226
    /*
227
     * Detach from the containing task.
228
     */
229
    spinlock_lock(&t->task->lock);
230
    list_remove(&t->th_link);
231
    spinlock_unlock(&t->task->lock);
232
 
233
    spinlock_unlock(&t->lock);
234
 
235
    spinlock_lock(&threads_lock);
236
    list_remove(&t->threads_link);
237
    spinlock_unlock(&threads_lock);
238
 
239
    slab_free(thread_slab, t);
240
}
241
 
242
 
107 decky 243
/** Create new thread
244
 *
245
 * Create a new thread.
246
 *
247
 * @param func  Thread's implementing function.
248
 * @param arg   Thread's implementing function argument.
249
 * @param task  Task to which the thread belongs.
250
 * @param flags Thread flags.
251
 *
252
 * @return New thread's structure on success, NULL on failure.
253
 *
254
 */
1 jermar 255
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
256
{
257
    thread_t *t;
822 palkovsky 258
    ipl_t ipl;
259
 
787 palkovsky 260
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 261
    if (!t)
262
        return NULL;
1 jermar 263
 
822 palkovsky 264
    /* Not needed, but good for debugging */
265
    memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
266
 
267
    ipl = interrupts_disable();
268
    spinlock_lock(&tidlock);
269
    t->tid = ++last_tid;
270
    spinlock_unlock(&tidlock);
271
    interrupts_restore(ipl);
272
 
273
    context_save(&t->saved_context);
274
    context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
275
 
276
    the_initialize((the_t *) t->kstack);
277
 
278
    ipl = interrupts_disable();
279
    t->saved_context.ipl = interrupts_read();
280
    interrupts_restore(ipl);
281
 
282
    t->thread_code = func;
283
    t->thread_arg = arg;
284
    t->ticks = -1;
285
    t->priority = -1;       /* start in rq[0] */
286
    t->cpu = NULL;
287
    t->flags = 0;
288
    t->state = Entering;
289
    t->call_me = NULL;
290
    t->call_me_with = NULL;
291
 
292
    timeout_initialize(&t->sleep_timeout);
293
    t->sleep_queue = NULL;
294
    t->timeout_pending = 0;
295
 
296
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 297
 
822 palkovsky 298
    t->task = task;
299
 
860 decky 300
    t->fpu_context_exists = 0;
301
    t->fpu_context_engaged = 0;
822 palkovsky 302
 
303
    /*
304
     * Register this thread in the system-wide list.
305
     */
306
    ipl = interrupts_disable();
307
    spinlock_lock(&threads_lock);
308
    list_append(&t->threads_link, &threads_head);
309
    spinlock_unlock(&threads_lock);
310
 
311
    /*
312
     * Attach to the containing task.
313
     */
314
    spinlock_lock(&task->lock);
315
    list_append(&t->th_link, &task->th_head);
316
    spinlock_unlock(&task->lock);
317
 
318
    interrupts_restore(ipl);
860 decky 319
 
1 jermar 320
    return t;
321
}
322
 
107 decky 323
 
324
/** Make thread exiting
325
 *
326
 * End current thread execution and switch it to the exiting
327
 * state. All pending timeouts are executed.
328
 *
329
 */
1 jermar 330
void thread_exit(void)
331
{
413 jermar 332
    ipl_t ipl;
1 jermar 333
 
334
restart:
413 jermar 335
    ipl = interrupts_disable();
15 jermar 336
    spinlock_lock(&THREAD->lock);
337
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
338
        spinlock_unlock(&THREAD->lock);
413 jermar 339
        interrupts_restore(ipl);
1 jermar 340
        goto restart;
341
    }
15 jermar 342
    THREAD->state = Exiting;
343
    spinlock_unlock(&THREAD->lock);
1 jermar 344
    scheduler();
345
}
346
 
107 decky 347
 
348
/** Thread sleep
349
 *
350
 * Suspend execution of the current thread.
351
 *
352
 * @param sec Number of seconds to sleep.
353
 *
354
 */
1 jermar 355
void thread_sleep(__u32 sec)
356
{
125 jermar 357
    thread_usleep(sec*1000000);
1 jermar 358
}
107 decky 359
 
360
 
361
/** Thread usleep
362
 *
363
 * Suspend execution of the current thread.
364
 *
365
 * @param usec Number of microseconds to sleep.
366
 *
367
 */
1 jermar 368
void thread_usleep(__u32 usec)
369
{
370
    waitq_t wq;
371
 
372
    waitq_initialize(&wq);
373
 
374
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
375
}
376
 
107 decky 377
 
378
/** Register thread out-of-context invocation
379
 *
380
 * Register a function and its argument to be executed
381
 * on next context switch to the current thread.
382
 *
383
 * @param call_me      Out-of-context function.
384
 * @param call_me_with Out-of-context function argument.
385
 *
386
 */
1 jermar 387
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
388
{
413 jermar 389
    ipl_t ipl;
1 jermar 390
 
413 jermar 391
    ipl = interrupts_disable();
15 jermar 392
    spinlock_lock(&THREAD->lock);
393
    THREAD->call_me = call_me;
394
    THREAD->call_me_with = call_me_with;
395
    spinlock_unlock(&THREAD->lock);
413 jermar 396
    interrupts_restore(ipl);
1 jermar 397
}
777 palkovsky 398
 
399
/** Print list of threads debug info */
400
void thread_print_list(void)
401
{
402
    link_t *cur;
403
    thread_t *t;
404
    ipl_t ipl;
405
 
406
    /* Messing with thread structures, avoid deadlock */
407
    ipl = interrupts_disable();
408
    spinlock_lock(&threads_lock);
409
 
410
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
411
        t = list_get_instance(cur, thread_t, threads_link);
412
        printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
413
        if (t->cpu)
414
            printf("cpu%d ", t->cpu->id);
415
 
416
        printf("\n");
417
    }
418
 
419
    spinlock_unlock(&threads_lock);
420
    interrupts_enable();
421
}