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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 <arch/types.h> |
39 | #include <arch/types.h> |
40 | #include <config.h> |
40 | #include <config.h> |
41 | #include <panic.h> |
41 | #include <panic.h> |
42 | #include <synch/spinlock.h> |
42 | #include <synch/spinlock.h> |
43 | #include <func.h> |
43 | #include <func.h> |
44 | #include <cpu.h> |
44 | #include <cpu.h> |
45 | #include <arch/asm.h> |
45 | #include <arch/asm.h> |
46 | #include <arch.h> |
46 | #include <arch.h> |
47 | 47 | ||
48 | /** Initialize timeouts |
48 | /** Initialize timeouts |
49 | * |
49 | * |
50 | * Initialize kernel timeouts. |
50 | * Initialize kernel timeouts. |
51 | * |
51 | * |
52 | */ |
52 | */ |
53 | void timeout_init(void) |
53 | void timeout_init(void) |
54 | { |
54 | { |
55 | spinlock_initialize(&CPU->timeoutlock, "timeout_lock"); |
55 | spinlock_initialize(&CPU->timeoutlock, "timeout_lock"); |
56 | list_initialize(&CPU->timeout_active_head); |
56 | list_initialize(&CPU->timeout_active_head); |
57 | } |
57 | } |
58 | 58 | ||
59 | 59 | ||
60 | /** Reinitialize timeout |
60 | /** Reinitialize timeout |
61 | * |
61 | * |
62 | * Initialize all members except the lock. |
62 | * Initialize all members except the lock. |
63 | * |
63 | * |
64 | * @param t Timeout to be initialized. |
64 | * @param t Timeout to be initialized. |
65 | * |
65 | * |
66 | */ |
66 | */ |
67 | void timeout_reinitialize(timeout_t *t) |
67 | void timeout_reinitialize(timeout_t *t) |
68 | { |
68 | { |
69 | t->cpu = NULL; |
69 | t->cpu = NULL; |
70 | t->ticks = 0; |
70 | t->ticks = 0; |
71 | t->handler = NULL; |
71 | t->handler = NULL; |
72 | t->arg = NULL; |
72 | t->arg = NULL; |
73 | link_initialize(&t->link); |
73 | link_initialize(&t->link); |
74 | } |
74 | } |
75 | 75 | ||
76 | 76 | ||
77 | /** Initialize timeout |
77 | /** Initialize timeout |
78 | * |
78 | * |
79 | * Initialize all members including the lock. |
79 | * Initialize all members including the lock. |
80 | * |
80 | * |
81 | * @param t Timeout to be initialized. |
81 | * @param t Timeout to be initialized. |
82 | * |
82 | * |
83 | */ |
83 | */ |
84 | void timeout_initialize(timeout_t *t) |
84 | void timeout_initialize(timeout_t *t) |
85 | { |
85 | { |
86 | spinlock_initialize(&t->lock, "timeout_t_lock"); |
86 | spinlock_initialize(&t->lock, "timeout_t_lock"); |
87 | timeout_reinitialize(t); |
87 | timeout_reinitialize(t); |
88 | } |
88 | } |
89 | 89 | ||
90 | 90 | ||
91 | /** Register timeout |
91 | /** Register timeout |
92 | * |
92 | * |
93 | * Insert timeout handler f (with argument arg) |
93 | * Insert timeout handler f (with argument arg) |
94 | * to timeout list and make it execute in |
94 | * to timeout list and make it execute in |
95 | * time microseconds (or slightly more). |
95 | * time microseconds (or slightly more). |
96 | * |
96 | * |
97 | * @param t Timeout structure. |
97 | * @param t Timeout structure. |
98 | * @param time Number of usec in the future to execute the handler. |
98 | * @param time Number of usec in the future to execute the handler. |
99 | * @param f Timeout handler function. |
99 | * @param f Timeout handler function. |
100 | * @param arg Timeout handler argument. |
100 | * @param arg Timeout handler argument. |
101 | * |
101 | * |
102 | */ |
102 | */ |
103 | void |
103 | void |
104 | timeout_register(timeout_t *t, uint64_t time, timeout_handler_t f, void *arg) |
104 | timeout_register(timeout_t *t, uint64_t time, timeout_handler_t f, void *arg) |
105 | { |
105 | { |
106 | timeout_t *hlp = NULL; |
106 | timeout_t *hlp = NULL; |
107 | link_t *l, *m; |
107 | link_t *l, *m; |
108 | ipl_t ipl; |
108 | ipl_t ipl; |
109 | uint64_t sum; |
109 | uint64_t sum; |
110 | 110 | ||
111 | ipl = interrupts_disable(); |
111 | ipl = interrupts_disable(); |
112 | spinlock_lock(&CPU->timeoutlock); |
112 | spinlock_lock(&CPU->timeoutlock); |
113 | spinlock_lock(&t->lock); |
113 | spinlock_lock(&t->lock); |
114 | 114 | ||
115 | if (t->cpu) |
115 | if (t->cpu) |
116 | panic("t->cpu != 0"); |
116 | panic("Unexpected: t->cpu != 0."); |
117 | 117 | ||
118 | t->cpu = CPU; |
118 | t->cpu = CPU; |
119 | t->ticks = us2ticks(time); |
119 | t->ticks = us2ticks(time); |
120 | 120 | ||
121 | t->handler = f; |
121 | t->handler = f; |
122 | t->arg = arg; |
122 | t->arg = arg; |
123 | 123 | ||
124 | /* |
124 | /* |
125 | * Insert t into the active timeouts list according to t->ticks. |
125 | * Insert t into the active timeouts list according to t->ticks. |
126 | */ |
126 | */ |
127 | sum = 0; |
127 | sum = 0; |
128 | l = CPU->timeout_active_head.next; |
128 | l = CPU->timeout_active_head.next; |
129 | while (l != &CPU->timeout_active_head) { |
129 | while (l != &CPU->timeout_active_head) { |
130 | hlp = list_get_instance(l, timeout_t, link); |
130 | hlp = list_get_instance(l, timeout_t, link); |
131 | spinlock_lock(&hlp->lock); |
131 | spinlock_lock(&hlp->lock); |
132 | if (t->ticks < sum + hlp->ticks) { |
132 | if (t->ticks < sum + hlp->ticks) { |
133 | spinlock_unlock(&hlp->lock); |
133 | spinlock_unlock(&hlp->lock); |
134 | break; |
134 | break; |
135 | } |
135 | } |
136 | sum += hlp->ticks; |
136 | sum += hlp->ticks; |
137 | spinlock_unlock(&hlp->lock); |
137 | spinlock_unlock(&hlp->lock); |
138 | l = l->next; |
138 | l = l->next; |
139 | } |
139 | } |
140 | 140 | ||
141 | m = l->prev; |
141 | m = l->prev; |
142 | list_prepend(&t->link, m); /* avoid using l->prev */ |
142 | list_prepend(&t->link, m); /* avoid using l->prev */ |
143 | 143 | ||
144 | /* |
144 | /* |
145 | * Adjust t->ticks according to ticks accumulated in h's predecessors. |
145 | * Adjust t->ticks according to ticks accumulated in h's predecessors. |
146 | */ |
146 | */ |
147 | t->ticks -= sum; |
147 | t->ticks -= sum; |
148 | 148 | ||
149 | /* |
149 | /* |
150 | * Decrease ticks of t's immediate succesor by t->ticks. |
150 | * Decrease ticks of t's immediate succesor by t->ticks. |
151 | */ |
151 | */ |
152 | if (l != &CPU->timeout_active_head) { |
152 | if (l != &CPU->timeout_active_head) { |
153 | spinlock_lock(&hlp->lock); |
153 | spinlock_lock(&hlp->lock); |
154 | hlp->ticks -= t->ticks; |
154 | hlp->ticks -= t->ticks; |
155 | spinlock_unlock(&hlp->lock); |
155 | spinlock_unlock(&hlp->lock); |
156 | } |
156 | } |
157 | 157 | ||
158 | spinlock_unlock(&t->lock); |
158 | spinlock_unlock(&t->lock); |
159 | spinlock_unlock(&CPU->timeoutlock); |
159 | spinlock_unlock(&CPU->timeoutlock); |
160 | interrupts_restore(ipl); |
160 | interrupts_restore(ipl); |
161 | } |
161 | } |
162 | 162 | ||
163 | 163 | ||
164 | /** Unregister timeout |
164 | /** Unregister timeout |
165 | * |
165 | * |
166 | * Remove timeout from timeout list. |
166 | * Remove timeout from timeout list. |
167 | * |
167 | * |
168 | * @param t Timeout to unregister. |
168 | * @param t Timeout to unregister. |
169 | * |
169 | * |
170 | * @return True on success, false on failure. |
170 | * @return True on success, false on failure. |
171 | */ |
171 | */ |
172 | bool timeout_unregister(timeout_t *t) |
172 | bool timeout_unregister(timeout_t *t) |
173 | { |
173 | { |
174 | timeout_t *hlp; |
174 | timeout_t *hlp; |
175 | link_t *l; |
175 | link_t *l; |
176 | ipl_t ipl; |
176 | ipl_t ipl; |
177 | DEADLOCK_PROBE_INIT(p_tolock); |
177 | DEADLOCK_PROBE_INIT(p_tolock); |
178 | 178 | ||
179 | grab_locks: |
179 | grab_locks: |
180 | ipl = interrupts_disable(); |
180 | ipl = interrupts_disable(); |
181 | spinlock_lock(&t->lock); |
181 | spinlock_lock(&t->lock); |
182 | if (!t->cpu) { |
182 | if (!t->cpu) { |
183 | spinlock_unlock(&t->lock); |
183 | spinlock_unlock(&t->lock); |
184 | interrupts_restore(ipl); |
184 | interrupts_restore(ipl); |
185 | return false; |
185 | return false; |
186 | } |
186 | } |
187 | if (!spinlock_trylock(&t->cpu->timeoutlock)) { |
187 | if (!spinlock_trylock(&t->cpu->timeoutlock)) { |
188 | spinlock_unlock(&t->lock); |
188 | spinlock_unlock(&t->lock); |
189 | interrupts_restore(ipl); |
189 | interrupts_restore(ipl); |
190 | DEADLOCK_PROBE(p_tolock, DEADLOCK_THRESHOLD); |
190 | DEADLOCK_PROBE(p_tolock, DEADLOCK_THRESHOLD); |
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 |