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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
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 | /* Lock ordering |
29 | /* Lock ordering |
30 | * |
30 | * |
31 | * First the answerbox, then the phone |
31 | * First the answerbox, then the phone |
32 | */ |
32 | */ |
33 | 33 | ||
34 | #include <synch/condvar.h> |
34 | #include <synch/condvar.h> |
35 | #include <synch/mutex.h> |
35 | #include <synch/mutex.h> |
36 | #include <ipc/ipc.h> |
36 | #include <ipc/ipc.h> |
37 | #include <errno.h> |
37 | #include <errno.h> |
38 | #include <mm/slab.h> |
38 | #include <mm/slab.h> |
39 | #include <arch.h> |
39 | #include <arch.h> |
40 | #include <proc/task.h> |
40 | #include <proc/task.h> |
41 | #include <memstr.h> |
41 | #include <memstr.h> |
42 | #include <debug.h> |
42 | #include <debug.h> |
43 | 43 | ||
44 | #include <print.h> |
44 | #include <print.h> |
45 | #include <proc/thread.h> |
45 | #include <proc/thread.h> |
46 | 46 | ||
47 | /* Open channel that is assigned automatically to new tasks */ |
47 | /* Open channel that is assigned automatically to new tasks */ |
48 | answerbox_t *ipc_phone_0 = NULL; |
48 | answerbox_t *ipc_phone_0 = NULL; |
49 | 49 | ||
50 | static slab_cache_t *ipc_call_slab; |
50 | static slab_cache_t *ipc_call_slab; |
51 | 51 | ||
52 | /** Allocate & initialize call structure |
52 | /** Allocate & initialize call structure |
53 | * |
53 | * |
54 | * The call is initialized, so that the reply will be directed |
54 | * The call is initialized, so that the reply will be directed |
55 | * to TASK->answerbox |
55 | * to TASK->answerbox |
56 | */ |
56 | */ |
57 | call_t * ipc_call_alloc(void) |
57 | call_t * ipc_call_alloc(void) |
58 | { |
58 | { |
59 | call_t *call; |
59 | call_t *call; |
60 | 60 | ||
61 | call = slab_alloc(ipc_call_slab, 0); |
61 | call = slab_alloc(ipc_call_slab, 0); |
62 | memsetb((__address)call, sizeof(*call), 0); |
62 | memsetb((__address)call, sizeof(*call), 0); |
63 | call->callerbox = &TASK->answerbox; |
63 | call->callerbox = &TASK->answerbox; |
- | 64 | call->sender = TASK; |
|
64 | 65 | ||
65 | return call; |
66 | return call; |
66 | } |
67 | } |
67 | 68 | ||
68 | /** Initialize allocated call */ |
69 | /** Initialize allocated call */ |
69 | void ipc_call_init(call_t *call) |
70 | void ipc_call_init(call_t *call) |
70 | { |
71 | { |
71 | call->callerbox = &TASK->answerbox; |
72 | call->callerbox = &TASK->answerbox; |
72 | call->flags = IPC_CALL_STATIC_ALLOC; |
73 | call->flags = IPC_CALL_STATIC_ALLOC; |
73 | } |
74 | } |
74 | 75 | ||
75 | /** Deallocate call stracuture */ |
76 | /** Deallocate call stracuture */ |
76 | void ipc_call_free(call_t *call) |
77 | void ipc_call_free(call_t *call) |
77 | { |
78 | { |
78 | slab_free(ipc_call_slab, call); |
79 | slab_free(ipc_call_slab, call); |
79 | } |
80 | } |
80 | 81 | ||
81 | /** Initialize answerbox structure |
82 | /** Initialize answerbox structure |
82 | */ |
83 | */ |
83 | void ipc_answerbox_init(answerbox_t *box) |
84 | void ipc_answerbox_init(answerbox_t *box) |
84 | { |
85 | { |
85 | mutex_initialize(&box->mutex); |
86 | mutex_initialize(&box->mutex); |
86 | condvar_initialize(&box->cv); |
87 | condvar_initialize(&box->cv); |
87 | list_initialize(&box->connected_phones); |
88 | list_initialize(&box->connected_phones); |
88 | list_initialize(&box->calls); |
89 | list_initialize(&box->calls); |
89 | list_initialize(&box->dispatched_calls); |
90 | list_initialize(&box->dispatched_calls); |
90 | list_initialize(&box->answers); |
91 | list_initialize(&box->answers); |
91 | } |
92 | } |
92 | 93 | ||
93 | /** Initialize phone structure and connect phone to naswerbox |
94 | /** Initialize phone structure and connect phone to naswerbox |
94 | */ |
95 | */ |
95 | void ipc_phone_init(phone_t *phone, answerbox_t *box) |
96 | void ipc_phone_init(phone_t *phone, answerbox_t *box) |
96 | { |
97 | { |
97 | spinlock_initialize(&phone->lock, "phone_lock"); |
98 | spinlock_initialize(&phone->lock, "phone_lock"); |
98 | 99 | ||
99 | phone->callee = box; |
100 | phone->callee = box; |
100 | 101 | ||
101 | mutex_lock(&box->mutex); |
102 | mutex_lock(&box->mutex); |
102 | list_append(&phone->list, &box->connected_phones); |
103 | list_append(&phone->list, &box->connected_phones); |
103 | mutex_unlock(&box->mutex); |
104 | mutex_unlock(&box->mutex); |
104 | } |
105 | } |
105 | 106 | ||
106 | /** Disconnect phone from answerbox */ |
107 | /** Disconnect phone from answerbox */ |
107 | void ipc_phone_destroy(phone_t *phone) |
108 | void ipc_phone_destroy(phone_t *phone) |
108 | { |
109 | { |
109 | answerbox_t *box = phone->callee; |
110 | answerbox_t *box = phone->callee; |
110 | 111 | ||
111 | ASSERT(box); |
112 | ASSERT(box); |
112 | 113 | ||
113 | mutex_lock(&box->mutex); |
114 | mutex_lock(&box->mutex); |
114 | list_remove(&phone->list); |
115 | list_remove(&phone->list); |
115 | mutex_unlock(&box->mutex); |
116 | mutex_unlock(&box->mutex); |
116 | } |
117 | } |
117 | 118 | ||
118 | /** Helper function to facilitate synchronous calls */ |
119 | /** Helper function to facilitate synchronous calls */ |
119 | void ipc_call_sync(phone_t *phone, call_t *request) |
120 | void ipc_call_sync(phone_t *phone, call_t *request) |
120 | { |
121 | { |
121 | answerbox_t sync_box; |
122 | answerbox_t sync_box; |
122 | 123 | ||
123 | ipc_answerbox_init(&sync_box); |
124 | ipc_answerbox_init(&sync_box); |
124 | 125 | ||
125 | /* We will receive data on special box */ |
126 | /* We will receive data on special box */ |
126 | request->callerbox = &sync_box; |
127 | request->callerbox = &sync_box; |
127 | 128 | ||
128 | ipc_call(phone, request); |
129 | ipc_call(phone, request); |
129 | ipc_wait_for_call(&sync_box, 0); |
130 | ipc_wait_for_call(&sync_box, 0); |
130 | } |
131 | } |
131 | 132 | ||
132 | /** Send a asynchronous request using phone to answerbox |
133 | /** Send a asynchronous request using phone to answerbox |
133 | * |
134 | * |
134 | * @param phone Phone connected to answerbox |
135 | * @param phone Phone connected to answerbox |
135 | * @param request Request to be sent |
136 | * @param request Request to be sent |
136 | */ |
137 | */ |
137 | void ipc_call(phone_t *phone, call_t *request) |
138 | void ipc_call(phone_t *phone, call_t *request) |
138 | { |
139 | { |
139 | answerbox_t *box = phone->callee; |
140 | answerbox_t *box = phone->callee; |
140 | 141 | ||
141 | ASSERT(box); |
142 | ASSERT(box); |
142 | 143 | ||
143 | mutex_lock(&box->mutex); |
144 | mutex_lock(&box->mutex); |
144 | list_append(&request->list, &box->calls); |
145 | list_append(&request->list, &box->calls); |
145 | mutex_unlock(&box->mutex); |
146 | mutex_unlock(&box->mutex); |
146 | condvar_signal(&box->cv); |
147 | condvar_signal(&box->cv); |
147 | } |
148 | } |
148 | 149 | ||
149 | /** Answer message back to phone |
150 | /** Answer message back to phone |
150 | * |
151 | * |
151 | * @param box Answerbox that is answering the message |
152 | * @param box Answerbox that is answering the message |
152 | * @param request Modified request that is being sent back |
153 | * @param request Modified request that is being sent back |
153 | */ |
154 | */ |
154 | void ipc_answer(answerbox_t *box, call_t *request) |
155 | void ipc_answer(answerbox_t *box, call_t *request) |
155 | { |
156 | { |
156 | answerbox_t *callerbox = request->callerbox; |
157 | answerbox_t *callerbox = request->callerbox; |
157 | 158 | ||
158 | request->flags |= IPC_CALL_ANSWERED; |
159 | request->flags |= IPC_CALL_ANSWERED; |
159 | 160 | ||
160 | mutex_lock(&box->mutex); |
161 | mutex_lock(&box->mutex); |
161 | list_remove(&request->list); |
162 | list_remove(&request->list); |
162 | mutex_unlock(&box->mutex); |
163 | mutex_unlock(&box->mutex); |
163 | 164 | ||
164 | mutex_lock(&callerbox->mutex); |
165 | mutex_lock(&callerbox->mutex); |
165 | list_append(&request->list, &callerbox->answers); |
166 | list_append(&request->list, &callerbox->answers); |
166 | mutex_unlock(&callerbox->mutex); |
167 | mutex_unlock(&callerbox->mutex); |
167 | condvar_signal(&callerbox->cv); |
168 | condvar_signal(&callerbox->cv); |
168 | } |
169 | } |
169 | 170 | ||
170 | /** Wait for phone call |
171 | /** Wait for phone call |
171 | * |
172 | * |
172 | * @return Recived message address |
173 | * @return Recived message address |
173 | * - to distinguish between call and answer, look at call->flags |
174 | * - to distinguish between call and answer, look at call->flags |
174 | */ |
175 | */ |
175 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
176 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
176 | { |
177 | { |
177 | call_t *request; |
178 | call_t *request; |
178 | 179 | ||
179 | mutex_lock(&box->mutex); |
180 | mutex_lock(&box->mutex); |
180 | while (1) { |
181 | while (1) { |
181 | if (!list_empty(&box->answers)) { |
182 | if (!list_empty(&box->answers)) { |
182 | /* Handle asynchronous answers */ |
183 | /* Handle asynchronous answers */ |
183 | request = list_get_instance(box->answers.next, call_t, list); |
184 | request = list_get_instance(box->answers.next, call_t, list); |
184 | list_remove(&request->list); |
185 | list_remove(&request->list); |
185 | } else if (!list_empty(&box->calls)) { |
186 | } else if (!list_empty(&box->calls)) { |
186 | /* Handle requests */ |
187 | /* Handle requests */ |
187 | request = list_get_instance(box->calls.next, call_t, list); |
188 | request = list_get_instance(box->calls.next, call_t, list); |
188 | list_remove(&request->list); |
189 | list_remove(&request->list); |
189 | /* Append request to dispatch queue */ |
190 | /* Append request to dispatch queue */ |
190 | list_append(&request->list, &box->dispatched_calls); |
191 | list_append(&request->list, &box->dispatched_calls); |
191 | } else { |
192 | } else { |
192 | if (!(flags & IPC_WAIT_NONBLOCKING)) { |
193 | if (!(flags & IPC_WAIT_NONBLOCKING)) { |
193 | /* Wait for event to appear */ |
194 | /* Wait for event to appear */ |
194 | condvar_wait(&box->cv, &box->mutex); |
195 | condvar_wait(&box->cv, &box->mutex); |
195 | continue; |
196 | continue; |
196 | } |
197 | } |
197 | request = NULL; |
198 | request = NULL; |
198 | } |
199 | } |
199 | break; |
200 | break; |
200 | } |
201 | } |
201 | mutex_unlock(&box->mutex); |
202 | mutex_unlock(&box->mutex); |
202 | return request; |
203 | return request; |
203 | } |
204 | } |
204 | 205 | ||
205 | /** Initilize ipc subsystem */ |
206 | /** Initilize ipc subsystem */ |
206 | void ipc_init(void) |
207 | void ipc_init(void) |
207 | { |
208 | { |
208 | ipc_call_slab = slab_cache_create("ipc_call", |
209 | ipc_call_slab = slab_cache_create("ipc_call", |
209 | sizeof(call_t), |
210 | sizeof(call_t), |
210 | 0, |
211 | 0, |
211 | NULL, NULL, 0); |
212 | NULL, NULL, 0); |
212 | } |
213 | } |
213 | 214 |