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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * 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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1731 jermar 29
/** @addtogroup time
1702 cejka 30
 * @{
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 */
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1264 jermar 33
/**
1702 cejka 34
 * @file
2916 jermar 35
 * @brief       Timeout management functions.
1264 jermar 36
 */
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1 jermar 38
#include <time/timeout.h>
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#include <arch/types.h>
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#include <config.h>
68 decky 41
#include <panic.h>
1 jermar 42
#include <synch/spinlock.h>
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#include <func.h>
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#include <cpu.h>
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#include <arch/asm.h>
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#include <arch.h>
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107 decky 48
/** Initialize timeouts
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 *
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 * Initialize kernel timeouts.
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 *
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 */
1 jermar 53
void timeout_init(void)
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{
552 palkovsky 55
    spinlock_initialize(&CPU->timeoutlock, "timeout_lock");
15 jermar 56
    list_initialize(&CPU->timeout_active_head);
1 jermar 57
}
58
 
59
 
411 jermar 60
/** Reinitialize timeout
107 decky 61
 *
411 jermar 62
 * Initialize all members except the lock.
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 *
2916 jermar 64
 * @param t     Timeout to be initialized.
107 decky 65
 *
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 */
1 jermar 67
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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}
75
 
107 decky 76
 
411 jermar 77
/** Initialize timeout
107 decky 78
 *
411 jermar 79
 * Initialize all members including the lock.
107 decky 80
 *
2916 jermar 81
 * @param t     Timeout to be initialized.
107 decky 82
 *
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 */
1 jermar 84
void timeout_initialize(timeout_t *t)
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{
552 palkovsky 86
    spinlock_initialize(&t->lock, "timeout_t_lock");
1 jermar 87
    timeout_reinitialize(t);
88
}
89
 
107 decky 90
 
411 jermar 91
/** Register timeout
107 decky 92
 *
411 jermar 93
 * Insert timeout handler f (with argument arg)
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 * to timeout list and make it execute in
107 decky 95
 * time microseconds (or slightly more).
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 *
2916 jermar 97
 * @param t     Timeout structure.
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 * @param time      Number of usec in the future to execute the handler.
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 * @param f     Timeout handler function.
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 * @param arg       Timeout handler argument.
107 decky 101
 *
1 jermar 102
 */
2916 jermar 103
void
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timeout_register(timeout_t *t, uint64_t time, timeout_handler_t f, void *arg)
1 jermar 105
{
659 jermar 106
    timeout_t *hlp = NULL;
1 jermar 107
    link_t *l, *m;
413 jermar 108
    ipl_t ipl;
1780 jermar 109
    uint64_t sum;
1 jermar 110
 
413 jermar 111
    ipl = interrupts_disable();
15 jermar 112
    spinlock_lock(&CPU->timeoutlock);
1 jermar 113
    spinlock_lock(&t->lock);
125 jermar 114
 
1 jermar 115
    if (t->cpu)
103 jermar 116
        panic("t->cpu != 0");
1 jermar 117
 
15 jermar 118
    t->cpu = CPU;
1 jermar 119
    t->ticks = us2ticks(time);
120
 
121
    t->handler = f;
122
    t->arg = arg;
125 jermar 123
 
1 jermar 124
    /*
125
     * Insert t into the active timeouts list according to t->ticks.
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     */
127
    sum = 0;
15 jermar 128
    l = CPU->timeout_active_head.next;
129
    while (l != &CPU->timeout_active_head) {
1 jermar 130
        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) {
133
            spinlock_unlock(&hlp->lock);
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            break;
135
        }
136
        sum += hlp->ticks;
137
        spinlock_unlock(&hlp->lock);
138
        l = l->next;
139
    }
239 vana 140
 
1 jermar 141
    m = l->prev;
142
    list_prepend(&t->link, m); /* avoid using l->prev */
143
 
144
    /*
145
     * Adjust t->ticks according to ticks accumulated in h's predecessors.
146
     */
147
    t->ticks -= sum;
148
 
149
    /*
150
     * Decrease ticks of t's immediate succesor by t->ticks.
151
     */
15 jermar 152
    if (l != &CPU->timeout_active_head) {
1 jermar 153
        spinlock_lock(&hlp->lock);
154
        hlp->ticks -= t->ticks;
155
        spinlock_unlock(&hlp->lock);
156
    }
157
 
158
    spinlock_unlock(&t->lock);
15 jermar 159
    spinlock_unlock(&CPU->timeoutlock);
413 jermar 160
    interrupts_restore(ipl);
1 jermar 161
}
162
 
107 decky 163
 
411 jermar 164
/** Unregister timeout
107 decky 165
 *
166
 * Remove timeout from timeout list.
167
 *
2916 jermar 168
 * @param t     Timeout to unregister.
107 decky 169
 *
2916 jermar 170
 * @return      True on success, false on failure.
107 decky 171
 */
411 jermar 172
bool timeout_unregister(timeout_t *t)
1 jermar 173
{
174
    timeout_t *hlp;
175
    link_t *l;
413 jermar 176
    ipl_t ipl;
2183 jermar 177
    DEADLOCK_PROBE_INIT(p_tolock);
1 jermar 178
 
179
grab_locks:
413 jermar 180
    ipl = interrupts_disable();
1 jermar 181
    spinlock_lock(&t->lock);
182
    if (!t->cpu) {
183
        spinlock_unlock(&t->lock);
413 jermar 184
        interrupts_restore(ipl);
411 jermar 185
        return false;
1 jermar 186
    }
187
    if (!spinlock_trylock(&t->cpu->timeoutlock)) {
188
        spinlock_unlock(&t->lock);
2183 jermar 189
        interrupts_restore(ipl);
190
        DEADLOCK_PROBE(p_tolock, DEADLOCK_THRESHOLD);
1 jermar 191
        goto grab_locks;
192
    }
193
 
194
    /*
195
     * Now we know for sure that t hasn't been activated yet
196
     * and is lurking in t->cpu->timeout_active_head queue.
197
     */
198
 
199
    l = t->link.next;
200
    if (l != &t->cpu->timeout_active_head) {
201
        hlp = list_get_instance(l, timeout_t, link);
202
        spinlock_lock(&hlp->lock);
203
        hlp->ticks += t->ticks;
204
        spinlock_unlock(&hlp->lock);
205
    }
206
 
207
    list_remove(&t->link);
208
    spinlock_unlock(&t->cpu->timeoutlock);
209
 
210
    timeout_reinitialize(t);
211
    spinlock_unlock(&t->lock);
212
 
413 jermar 213
    interrupts_restore(ipl);
411 jermar 214
    return true;
1 jermar 215
}
1702 cejka 216
 
1731 jermar 217
/** @}
1702 cejka 218
 */