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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup time |
29 | /** @addtogroup time |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Timeout management functions. |
35 | * @brief Timeout management functions. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <time/timeout.h> |
38 | #include <time/timeout.h> |
39 | #include <typedefs.h> |
39 | #include <typedefs.h> |
40 | #include <arch/types.h> |
40 | #include <arch/types.h> |
41 | #include <config.h> |
41 | #include <config.h> |
42 | #include <panic.h> |
42 | #include <panic.h> |
43 | #include <synch/spinlock.h> |
43 | #include <synch/spinlock.h> |
44 | #include <func.h> |
44 | #include <func.h> |
45 | #include <cpu.h> |
45 | #include <cpu.h> |
46 | #include <arch/asm.h> |
46 | #include <arch/asm.h> |
47 | #include <arch.h> |
47 | #include <arch.h> |
48 | 48 | ||
49 | 49 | ||
50 | /** Initialize timeouts |
50 | /** Initialize timeouts |
51 | * |
51 | * |
52 | * Initialize kernel timeouts. |
52 | * Initialize kernel timeouts. |
53 | * |
53 | * |
54 | */ |
54 | */ |
55 | void timeout_init(void) |
55 | void timeout_init(void) |
56 | { |
56 | { |
57 | spinlock_initialize(&CPU->timeoutlock, "timeout_lock"); |
57 | spinlock_initialize(&CPU->timeoutlock, "timeout_lock"); |
58 | list_initialize(&CPU->timeout_active_head); |
58 | list_initialize(&CPU->timeout_active_head); |
59 | } |
59 | } |
60 | 60 | ||
61 | 61 | ||
62 | /** Reinitialize timeout |
62 | /** Reinitialize timeout |
63 | * |
63 | * |
64 | * Initialize all members except the lock. |
64 | * Initialize all members except the lock. |
65 | * |
65 | * |
66 | * @param t Timeout to be initialized. |
66 | * @param t Timeout to be initialized. |
67 | * |
67 | * |
68 | */ |
68 | */ |
69 | void timeout_reinitialize(timeout_t *t) |
69 | void timeout_reinitialize(timeout_t *t) |
70 | { |
70 | { |
71 | t->cpu = NULL; |
71 | t->cpu = NULL; |
72 | t->ticks = 0; |
72 | t->ticks = 0; |
73 | t->handler = NULL; |
73 | t->handler = NULL; |
74 | t->arg = NULL; |
74 | t->arg = NULL; |
75 | link_initialize(&t->link); |
75 | link_initialize(&t->link); |
76 | } |
76 | } |
77 | 77 | ||
78 | 78 | ||
79 | /** Initialize timeout |
79 | /** Initialize timeout |
80 | * |
80 | * |
81 | * Initialize all members including the lock. |
81 | * Initialize all members including the lock. |
82 | * |
82 | * |
83 | * @param t Timeout to be initialized. |
83 | * @param t Timeout to be initialized. |
84 | * |
84 | * |
85 | */ |
85 | */ |
86 | void timeout_initialize(timeout_t *t) |
86 | void timeout_initialize(timeout_t *t) |
87 | { |
87 | { |
88 | spinlock_initialize(&t->lock, "timeout_t_lock"); |
88 | spinlock_initialize(&t->lock, "timeout_t_lock"); |
89 | timeout_reinitialize(t); |
89 | timeout_reinitialize(t); |
90 | } |
90 | } |
91 | 91 | ||
92 | 92 | ||
93 | /** Register timeout |
93 | /** Register timeout |
94 | * |
94 | * |
95 | * Insert timeout handler f (with argument arg) |
95 | * Insert timeout handler f (with argument arg) |
96 | * to timeout list and make it execute in |
96 | * to timeout list and make it execute in |
97 | * time microseconds (or slightly more). |
97 | * time microseconds (or slightly more). |
98 | * |
98 | * |
99 | * @param t Timeout structure. |
99 | * @param t Timeout structure. |
100 | * @param time Number of usec in the future to execute |
100 | * @param time Number of usec in the future to execute |
101 | * the handler. |
101 | * the handler. |
102 | * @param f Timeout handler function. |
102 | * @param f Timeout handler function. |
103 | * @param arg Timeout handler argument. |
103 | * @param arg Timeout handler argument. |
104 | * |
104 | * |
105 | */ |
105 | */ |
106 | void timeout_register(timeout_t *t, uint64_t time, timeout_handler_t f, void *arg) |
106 | void timeout_register(timeout_t *t, uint64_t time, timeout_handler_t f, void *arg) |
107 | { |
107 | { |
108 | timeout_t *hlp = NULL; |
108 | timeout_t *hlp = NULL; |
109 | link_t *l, *m; |
109 | link_t *l, *m; |
110 | ipl_t ipl; |
110 | ipl_t ipl; |
111 | uint64_t sum; |
111 | uint64_t sum; |
112 | 112 | ||
113 | ipl = interrupts_disable(); |
113 | ipl = interrupts_disable(); |
114 | spinlock_lock(&CPU->timeoutlock); |
114 | spinlock_lock(&CPU->timeoutlock); |
115 | spinlock_lock(&t->lock); |
115 | spinlock_lock(&t->lock); |
116 | 116 | ||
117 | if (t->cpu) |
117 | if (t->cpu) |
118 | panic("t->cpu != 0"); |
118 | panic("t->cpu != 0"); |
119 | 119 | ||
120 | t->cpu = CPU; |
120 | t->cpu = CPU; |
121 | t->ticks = us2ticks(time); |
121 | t->ticks = us2ticks(time); |
122 | 122 | ||
123 | t->handler = f; |
123 | t->handler = f; |
124 | t->arg = arg; |
124 | t->arg = arg; |
125 | 125 | ||
126 | /* |
126 | /* |
127 | * Insert t into the active timeouts list according to t->ticks. |
127 | * Insert t into the active timeouts list according to t->ticks. |
128 | */ |
128 | */ |
129 | sum = 0; |
129 | sum = 0; |
130 | l = CPU->timeout_active_head.next; |
130 | l = CPU->timeout_active_head.next; |
131 | while (l != &CPU->timeout_active_head) { |
131 | while (l != &CPU->timeout_active_head) { |
132 | hlp = list_get_instance(l, timeout_t, link); |
132 | hlp = list_get_instance(l, timeout_t, link); |
133 | spinlock_lock(&hlp->lock); |
133 | spinlock_lock(&hlp->lock); |
134 | if (t->ticks < sum + hlp->ticks) { |
134 | if (t->ticks < sum + hlp->ticks) { |
135 | spinlock_unlock(&hlp->lock); |
135 | spinlock_unlock(&hlp->lock); |
136 | break; |
136 | break; |
137 | } |
137 | } |
138 | sum += hlp->ticks; |
138 | sum += hlp->ticks; |
139 | spinlock_unlock(&hlp->lock); |
139 | spinlock_unlock(&hlp->lock); |
140 | l = l->next; |
140 | l = l->next; |
141 | } |
141 | } |
142 | 142 | ||
143 | m = l->prev; |
143 | m = l->prev; |
144 | list_prepend(&t->link, m); /* avoid using l->prev */ |
144 | list_prepend(&t->link, m); /* avoid using l->prev */ |
145 | 145 | ||
146 | /* |
146 | /* |
147 | * Adjust t->ticks according to ticks accumulated in h's predecessors. |
147 | * Adjust t->ticks according to ticks accumulated in h's predecessors. |
148 | */ |
148 | */ |
149 | t->ticks -= sum; |
149 | t->ticks -= sum; |
150 | 150 | ||
151 | /* |
151 | /* |
152 | * Decrease ticks of t's immediate succesor by t->ticks. |
152 | * Decrease ticks of t's immediate succesor by t->ticks. |
153 | */ |
153 | */ |
154 | if (l != &CPU->timeout_active_head) { |
154 | if (l != &CPU->timeout_active_head) { |
155 | spinlock_lock(&hlp->lock); |
155 | spinlock_lock(&hlp->lock); |
156 | hlp->ticks -= t->ticks; |
156 | hlp->ticks -= t->ticks; |
157 | spinlock_unlock(&hlp->lock); |
157 | spinlock_unlock(&hlp->lock); |
158 | } |
158 | } |
159 | 159 | ||
160 | spinlock_unlock(&t->lock); |
160 | spinlock_unlock(&t->lock); |
161 | spinlock_unlock(&CPU->timeoutlock); |
161 | spinlock_unlock(&CPU->timeoutlock); |
162 | interrupts_restore(ipl); |
162 | interrupts_restore(ipl); |
163 | } |
163 | } |
164 | 164 | ||
165 | 165 | ||
166 | /** Unregister timeout |
166 | /** Unregister timeout |
167 | * |
167 | * |
168 | * Remove timeout from timeout list. |
168 | * Remove timeout from timeout list. |
169 | * |
169 | * |
170 | * @param t Timeout to unregister. |
170 | * @param t Timeout to unregister. |
171 | * |
171 | * |
172 | * @return true on success, false on failure. |
172 | * @return true on success, false on failure. |
173 | */ |
173 | */ |
174 | bool timeout_unregister(timeout_t *t) |
174 | bool timeout_unregister(timeout_t *t) |
175 | { |
175 | { |
176 | timeout_t *hlp; |
176 | timeout_t *hlp; |
177 | link_t *l; |
177 | link_t *l; |
178 | ipl_t ipl; |
178 | ipl_t ipl; |
179 | 179 | ||
180 | grab_locks: |
180 | grab_locks: |
181 | ipl = interrupts_disable(); |
181 | ipl = interrupts_disable(); |
182 | spinlock_lock(&t->lock); |
182 | spinlock_lock(&t->lock); |
183 | if (!t->cpu) { |
183 | if (!t->cpu) { |
184 | spinlock_unlock(&t->lock); |
184 | spinlock_unlock(&t->lock); |
185 | interrupts_restore(ipl); |
185 | interrupts_restore(ipl); |
186 | return false; |
186 | return false; |
187 | } |
187 | } |
188 | if (!spinlock_trylock(&t->cpu->timeoutlock)) { |
188 | if (!spinlock_trylock(&t->cpu->timeoutlock)) { |
189 | spinlock_unlock(&t->lock); |
189 | spinlock_unlock(&t->lock); |
190 | interrupts_restore(ipl); |
190 | interrupts_restore(ipl); |
191 | goto grab_locks; |
191 | goto grab_locks; |
192 | } |
192 | } |
193 | 193 | ||
194 | /* |
194 | /* |
195 | * Now we know for sure that t hasn't been activated yet |
195 | * Now we know for sure that t hasn't been activated yet |
196 | * and is lurking in t->cpu->timeout_active_head queue. |
196 | * and is lurking in t->cpu->timeout_active_head queue. |
197 | */ |
197 | */ |
198 | 198 | ||
199 | l = t->link.next; |
199 | l = t->link.next; |
200 | if (l != &t->cpu->timeout_active_head) { |
200 | if (l != &t->cpu->timeout_active_head) { |
201 | hlp = list_get_instance(l, timeout_t, link); |
201 | hlp = list_get_instance(l, timeout_t, link); |
202 | spinlock_lock(&hlp->lock); |
202 | spinlock_lock(&hlp->lock); |
203 | hlp->ticks += t->ticks; |
203 | hlp->ticks += t->ticks; |
204 | spinlock_unlock(&hlp->lock); |
204 | spinlock_unlock(&hlp->lock); |
205 | } |
205 | } |
206 | 206 | ||
207 | list_remove(&t->link); |
207 | list_remove(&t->link); |
208 | spinlock_unlock(&t->cpu->timeoutlock); |
208 | spinlock_unlock(&t->cpu->timeoutlock); |
209 | 209 | ||
210 | timeout_reinitialize(t); |
210 | timeout_reinitialize(t); |
211 | spinlock_unlock(&t->lock); |
211 | spinlock_unlock(&t->lock); |
212 | 212 | ||
213 | interrupts_restore(ipl); |
213 | interrupts_restore(ipl); |
214 | return true; |
214 | return true; |
215 | } |
215 | } |
216 | 216 | ||
217 | /** @} |
217 | /** @} |
218 | */ |
218 | */ |
219 | 219 |