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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <time/timeout.h>
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#include <typedefs.h>
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#include <arch/types.h>
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#include <config.h>
68 decky 33
#include <panic.h>
1 jermar 34
#include <synch/spinlock.h>
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#include <func.h>
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#include <cpu.h>
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#include <print.h>
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#include <arch/asm.h>
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#include <arch.h>
239 vana 40
#include <print.h>
1 jermar 41
 
107 decky 42
 
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/** Initialize timeouts
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 *
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 * Initialize kernel timeouts.
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 *
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 */
1 jermar 48
void timeout_init(void)
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{
552 palkovsky 50
    spinlock_initialize(&CPU->timeoutlock, "timeout_lock");
15 jermar 51
    list_initialize(&CPU->timeout_active_head);
1 jermar 52
}
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411 jermar 55
/** Reinitialize timeout
107 decky 56
 *
411 jermar 57
 * Initialize all members except the lock.
107 decky 58
 *
411 jermar 59
 * @param t Timeout to be initialized.
107 decky 60
 *
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 */
1 jermar 62
void timeout_reinitialize(timeout_t *t)
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{
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    t->cpu = NULL;
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    t->ticks = 0;
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    t->handler = NULL;
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    t->arg = NULL;
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    link_initialize(&t->link);
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}
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107 decky 71
 
411 jermar 72
/** Initialize timeout
107 decky 73
 *
411 jermar 74
 * Initialize all members including the lock.
107 decky 75
 *
411 jermar 76
 * @param t Timeout to be initialized.
107 decky 77
 *
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 */
1 jermar 79
void timeout_initialize(timeout_t *t)
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{
552 palkovsky 81
    spinlock_initialize(&t->lock, "timeout_t_lock");
1 jermar 82
    timeout_reinitialize(t);
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}
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107 decky 85
 
411 jermar 86
/** Register timeout
107 decky 87
 *
411 jermar 88
 * Insert timeout handler f (with argument arg)
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 * to timeout list and make it execute in
107 decky 90
 * time microseconds (or slightly more).
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 *
411 jermar 92
 * @param t    Timeout structure.
404 jermar 93
 * @param time Number of usec in the future to execute
107 decky 94
 *             the handler.
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 * @param f    Timeout handler function.
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 * @param arg  Timeout handler argument.
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 *
1 jermar 98
 */
411 jermar 99
void timeout_register(timeout_t *t, __u64 time, timeout_handler_t f, void *arg)
1 jermar 100
{
659 jermar 101
    timeout_t *hlp = NULL;
1 jermar 102
    link_t *l, *m;
413 jermar 103
    ipl_t ipl;
1 jermar 104
    __u64 sum;
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413 jermar 106
    ipl = interrupts_disable();
15 jermar 107
    spinlock_lock(&CPU->timeoutlock);
1 jermar 108
    spinlock_lock(&t->lock);
125 jermar 109
 
1 jermar 110
    if (t->cpu)
103 jermar 111
        panic("t->cpu != 0");
1 jermar 112
 
15 jermar 113
    t->cpu = CPU;
1 jermar 114
    t->ticks = us2ticks(time);
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    t->handler = f;
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    t->arg = arg;
125 jermar 118
 
1 jermar 119
    /*
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     * Insert t into the active timeouts list according to t->ticks.
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     */
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    sum = 0;
15 jermar 123
    l = CPU->timeout_active_head.next;
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    while (l != &CPU->timeout_active_head) {
1 jermar 125
        hlp = list_get_instance(l, timeout_t, link);
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        spinlock_lock(&hlp->lock);
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        if (t->ticks < sum + hlp->ticks) {
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            spinlock_unlock(&hlp->lock);
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            break;
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        }
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        sum += hlp->ticks;
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        spinlock_unlock(&hlp->lock);
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        l = l->next;
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    }
239 vana 135
 
1 jermar 136
    m = l->prev;
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    list_prepend(&t->link, m); /* avoid using l->prev */
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    /*
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     * Adjust t->ticks according to ticks accumulated in h's predecessors.
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     */
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    t->ticks -= sum;
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144
    /*
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     * Decrease ticks of t's immediate succesor by t->ticks.
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     */
15 jermar 147
    if (l != &CPU->timeout_active_head) {
1 jermar 148
        spinlock_lock(&hlp->lock);
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        hlp->ticks -= t->ticks;
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        spinlock_unlock(&hlp->lock);
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    }
152
 
153
    spinlock_unlock(&t->lock);
15 jermar 154
    spinlock_unlock(&CPU->timeoutlock);
413 jermar 155
    interrupts_restore(ipl);
1 jermar 156
}
157
 
107 decky 158
 
411 jermar 159
/** Unregister timeout
107 decky 160
 *
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 * Remove timeout from timeout list.
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 *
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 * @param t Timeout to unregister.
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 *
411 jermar 165
 * @return true on success, false on failure.
107 decky 166
 */
411 jermar 167
bool timeout_unregister(timeout_t *t)
1 jermar 168
{
169
    timeout_t *hlp;
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    link_t *l;
413 jermar 171
    ipl_t ipl;
1 jermar 172
 
173
grab_locks:
413 jermar 174
    ipl = interrupts_disable();
1 jermar 175
    spinlock_lock(&t->lock);
176
    if (!t->cpu) {
177
        spinlock_unlock(&t->lock);
413 jermar 178
        interrupts_restore(ipl);
411 jermar 179
        return false;
1 jermar 180
    }
181
    if (!spinlock_trylock(&t->cpu->timeoutlock)) {
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        spinlock_unlock(&t->lock);
413 jermar 183
        interrupts_restore(ipl);       
1 jermar 184
        goto grab_locks;
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    }
186
 
187
    /*
188
     * Now we know for sure that t hasn't been activated yet
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     * and is lurking in t->cpu->timeout_active_head queue.
190
     */
191
 
192
    l = t->link.next;
193
    if (l != &t->cpu->timeout_active_head) {
194
        hlp = list_get_instance(l, timeout_t, link);
195
        spinlock_lock(&hlp->lock);
196
        hlp->ticks += t->ticks;
197
        spinlock_unlock(&hlp->lock);
198
    }
199
 
200
    list_remove(&t->link);
201
    spinlock_unlock(&t->cpu->timeoutlock);
202
 
203
    timeout_reinitialize(t);
204
    spinlock_unlock(&t->lock);
205
 
413 jermar 206
    interrupts_restore(ipl);
411 jermar 207
    return true;
1 jermar 208
}