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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/spinlock.h> |
34 | #include <synch/spinlock.h> |
35 | #include <synch/waitq.h> |
35 | #include <synch/waitq.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 | /* Initialize new call */ |
|
- | 53 | static void _ipc_call_init(call_t *call) |
|
- | 54 | { |
|
- | 55 | memsetb((__address)call, sizeof(*call), 0); |
|
- | 56 | call->callerbox = &TASK->answerbox; |
|
- | 57 | call->sender = TASK; |
|
- | 58 | } |
|
- | 59 | ||
52 | /** Allocate & initialize call structure |
60 | /** Allocate & initialize call structure |
53 | * |
61 | * |
54 | * The call is initialized, so that the reply will be directed |
62 | * The call is initialized, so that the reply will be directed |
55 | * to TASK->answerbox |
63 | * to TASK->answerbox |
56 | */ |
64 | */ |
57 | call_t * ipc_call_alloc(void) |
65 | call_t * ipc_call_alloc(void) |
58 | { |
66 | { |
59 | call_t *call; |
67 | call_t *call; |
60 | 68 | ||
61 | call = slab_alloc(ipc_call_slab, 0); |
69 | call = slab_alloc(ipc_call_slab, 0); |
62 | memsetb((__address)call, sizeof(*call), 0); |
- | |
63 | call->callerbox = &TASK->answerbox; |
- | |
64 | call->sender = TASK; |
70 | _ipc_call_init(call); |
65 | 71 | ||
66 | return call; |
72 | return call; |
67 | } |
73 | } |
68 | 74 | ||
69 | /** Initialize allocated call */ |
75 | /** Initialize allocated call */ |
70 | void ipc_call_init(call_t *call) |
76 | void ipc_call_static_init(call_t *call) |
71 | { |
77 | { |
72 | call->callerbox = &TASK->answerbox; |
78 | _ipc_call_init(call); |
73 | call->flags = IPC_CALL_STATIC_ALLOC; |
79 | call->flags |= IPC_CALL_STATIC_ALLOC; |
74 | call->sender = TASK; |
- | |
75 | } |
80 | } |
76 | 81 | ||
77 | /** Deallocate call stracuture */ |
82 | /** Deallocate call stracuture */ |
78 | void ipc_call_free(call_t *call) |
83 | void ipc_call_free(call_t *call) |
79 | { |
84 | { |
80 | slab_free(ipc_call_slab, call); |
85 | slab_free(ipc_call_slab, call); |
81 | } |
86 | } |
82 | 87 | ||
83 | /** Initialize answerbox structure |
88 | /** Initialize answerbox structure |
84 | */ |
89 | */ |
85 | void ipc_answerbox_init(answerbox_t *box) |
90 | void ipc_answerbox_init(answerbox_t *box) |
86 | { |
91 | { |
87 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
92 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
88 | waitq_initialize(&box->wq); |
93 | waitq_initialize(&box->wq); |
89 | list_initialize(&box->connected_phones); |
94 | list_initialize(&box->connected_phones); |
90 | list_initialize(&box->calls); |
95 | list_initialize(&box->calls); |
91 | list_initialize(&box->dispatched_calls); |
96 | list_initialize(&box->dispatched_calls); |
92 | list_initialize(&box->answers); |
97 | list_initialize(&box->answers); |
93 | box->task = TASK; |
98 | box->task = TASK; |
94 | } |
99 | } |
95 | 100 | ||
96 | /** Connect phone to answerbox */ |
101 | /** Connect phone to answerbox */ |
97 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
102 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
98 | { |
103 | { |
- | 104 | spinlock_lock(&phone->lock); |
|
- | 105 | ||
99 | ASSERT(!phone->callee); |
106 | ASSERT(!phone->callee); |
100 | phone->busy = 1; |
107 | phone->busy = 1; |
101 | phone->callee = box; |
108 | phone->callee = box; |
102 | 109 | ||
103 | spinlock_lock(&box->lock); |
110 | spinlock_lock(&box->lock); |
104 | list_append(&phone->list, &box->connected_phones); |
111 | list_append(&phone->list, &box->connected_phones); |
105 | spinlock_unlock(&box->lock); |
112 | spinlock_unlock(&box->lock); |
- | 113 | ||
- | 114 | spinlock_unlock(&phone->lock); |
|
106 | } |
115 | } |
107 | 116 | ||
108 | /** Initialize phone structure and connect phone to naswerbox |
117 | /** Initialize phone structure and connect phone to naswerbox |
109 | */ |
118 | */ |
110 | void ipc_phone_init(phone_t *phone) |
119 | void ipc_phone_init(phone_t *phone) |
111 | { |
120 | { |
112 | spinlock_initialize(&phone->lock, "phone_lock"); |
121 | spinlock_initialize(&phone->lock, "phone_lock"); |
113 | phone->callee = NULL; |
122 | phone->callee = NULL; |
114 | phone->busy = 0; |
123 | phone->busy = 0; |
115 | } |
124 | } |
116 | 125 | ||
117 | /** Disconnect phone from answerbox */ |
126 | /** Disconnect phone from answerbox |
- | 127 | * |
|
- | 128 | * It is allowed to call disconnect on already disconnected phone\ |
|
- | 129 | */ |
|
118 | void ipc_phone_destroy(phone_t *phone) |
130 | void ipc_phone_destroy(phone_t *phone) |
119 | { |
131 | { |
120 | answerbox_t *box = phone->callee; |
132 | answerbox_t *box = phone->callee; |
121 | 133 | ||
122 | ASSERT(box); |
134 | ASSERT(box); |
123 | 135 | ||
- | 136 | spinlock_lock(&phone->lock); |
|
124 | spinlock_lock(&box->lock); |
137 | spinlock_lock(&box->lock); |
- | 138 | ||
- | 139 | if (phone->callee) { |
|
125 | list_remove(&phone->list); |
140 | list_remove(&phone->list); |
- | 141 | phone->callee = NULL; |
|
- | 142 | } |
|
- | 143 | ||
126 | spinlock_unlock(&box->lock); |
144 | spinlock_unlock(&box->lock); |
- | 145 | spinlock_unlock(&phone->lock); |
|
127 | } |
146 | } |
128 | 147 | ||
129 | /** Helper function to facilitate synchronous calls */ |
148 | /** Helper function to facilitate synchronous calls */ |
130 | void ipc_call_sync(phone_t *phone, call_t *request) |
149 | void ipc_call_sync(phone_t *phone, call_t *request) |
131 | { |
150 | { |
132 | answerbox_t sync_box; |
151 | answerbox_t sync_box; |
133 | 152 | ||
134 | ipc_answerbox_init(&sync_box); |
153 | ipc_answerbox_init(&sync_box); |
135 | 154 | ||
136 | /* We will receive data on special box */ |
155 | /* We will receive data on special box */ |
137 | request->callerbox = &sync_box; |
156 | request->callerbox = &sync_box; |
138 | 157 | ||
139 | ipc_call(phone, request); |
158 | ipc_call(phone, request); |
140 | ipc_wait_for_call(&sync_box, 0); |
159 | ipc_wait_for_call(&sync_box, 0); |
141 | } |
160 | } |
142 | 161 | ||
- | 162 | /** Answer message that was not dispatched and is not entered in |
|
- | 163 | * any queue |
|
- | 164 | */ |
|
- | 165 | static void _ipc_answer_free_call(call_t *call) |
|
- | 166 | { |
|
- | 167 | answerbox_t *callerbox = call->callerbox; |
|
- | 168 | ||
- | 169 | call->flags &= ~IPC_CALL_DISPATCHED; |
|
- | 170 | call->flags |= IPC_CALL_ANSWERED; |
|
- | 171 | ||
- | 172 | spinlock_lock(&callerbox->lock); |
|
- | 173 | list_append(&call->list, &callerbox->answers); |
|
- | 174 | spinlock_unlock(&callerbox->lock); |
|
- | 175 | waitq_wakeup(&callerbox->wq, 0); |
|
- | 176 | } |
|
- | 177 | ||
- | 178 | /** Answer message, that is in callee queue |
|
- | 179 | * |
|
- | 180 | * @param box Answerbox that is answering the message |
|
- | 181 | * @param call Modified request that is being sent back |
|
- | 182 | */ |
|
- | 183 | void ipc_answer(answerbox_t *box, call_t *call) |
|
- | 184 | { |
|
- | 185 | /* Remove from active box */ |
|
- | 186 | spinlock_lock(&box->lock); |
|
- | 187 | list_remove(&call->list); |
|
- | 188 | spinlock_unlock(&box->lock); |
|
- | 189 | /* Send back answer */ |
|
- | 190 | _ipc_answer_free_call(call); |
|
- | 191 | } |
|
- | 192 | ||
143 | /** Send a asynchronous request using phone to answerbox |
193 | /** Send a asynchronous request using phone to answerbox |
144 | * |
194 | * |
145 | * @param phone Phone connected to answerbox |
195 | * @param phone Phone connected to answerbox |
146 | * @param request Request to be sent |
196 | * @param request Request to be sent |
147 | */ |
197 | */ |
148 | void ipc_call(phone_t *phone, call_t *call) |
198 | void ipc_call(phone_t *phone, call_t *call) |
149 | { |
199 | { |
150 | answerbox_t *box = phone->callee; |
200 | answerbox_t *box; |
151 | 201 | ||
- | 202 | spinlock_lock(&phone->lock); |
|
- | 203 | box = phone->callee; |
|
152 | ASSERT(box); |
204 | if (!box) { |
- | 205 | /* Trying to send over disconnected phone */ |
|
- | 206 | IPC_SET_RETVAL(call->data, ENOENT); |
|
- | 207 | _ipc_answer_free_call(call); |
|
- | 208 | return; |
|
- | 209 | } |
|
153 | 210 | ||
154 | spinlock_lock(&box->lock); |
211 | spinlock_lock(&box->lock); |
155 | list_append(&call->list, &box->calls); |
212 | list_append(&call->list, &box->calls); |
156 | spinlock_unlock(&box->lock); |
213 | spinlock_unlock(&box->lock); |
157 | waitq_wakeup(&box->wq, 0); |
214 | waitq_wakeup(&box->wq, 0); |
- | 215 | ||
- | 216 | spinlock_unlock(&phone->lock); |
|
158 | } |
217 | } |
159 | 218 | ||
160 | /** Forwards call from one answerbox to a new one |
219 | /** Forwards call from one answerbox to a new one |
161 | * |
220 | * |
162 | * @param request Request to be forwarded |
221 | * @param request Request to be forwarded |
163 | * @param newbox Target answerbox |
222 | * @param newbox Target answerbox |
164 | * @param oldbox Old answerbox |
223 | * @param oldbox Old answerbox |
165 | */ |
224 | */ |
166 | void ipc_forward(call_t *call, answerbox_t *newbox, answerbox_t *oldbox) |
225 | void ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox) |
167 | { |
226 | { |
168 | spinlock_lock(&oldbox->lock); |
227 | spinlock_lock(&oldbox->lock); |
169 | list_remove(&call->list); |
228 | list_remove(&call->list); |
170 | spinlock_unlock(&oldbox->lock); |
229 | spinlock_unlock(&oldbox->lock); |
171 | 230 | ||
172 | spinlock_lock(&newbox->lock); |
- | |
173 | list_append(&call->list, &newbox->calls); |
- | |
174 | spinlock_lock(&newbox->lock); |
- | |
175 | waitq_wakeup(&newbox->wq, 0); |
231 | ipc_call(newphone, call); |
176 | } |
232 | } |
177 | 233 | ||
178 | /** Answer message back to phone |
- | |
179 | * |
- | |
180 | * @param box Answerbox that is answering the message |
- | |
181 | * @param request Modified request that is being sent back |
- | |
182 | */ |
- | |
183 | void ipc_answer(answerbox_t *box, call_t *request) |
- | |
184 | { |
- | |
185 | answerbox_t *callerbox = request->callerbox; |
- | |
186 | - | ||
187 | request->flags &= ~IPC_CALL_DISPATCHED; |
- | |
188 | request->flags |= IPC_CALL_ANSWERED; |
- | |
189 | - | ||
190 | spinlock_lock(&box->lock); |
- | |
191 | list_remove(&request->list); |
- | |
192 | spinlock_unlock(&box->lock); |
- | |
193 | - | ||
194 | spinlock_lock(&callerbox->lock); |
- | |
195 | list_append(&request->list, &callerbox->answers); |
- | |
196 | spinlock_unlock(&callerbox->lock); |
- | |
197 | waitq_wakeup(&callerbox->wq, 0); |
- | |
198 | } |
- | |
199 | 234 | ||
200 | /** Wait for phone call |
235 | /** Wait for phone call |
201 | * |
236 | * |
202 | * @return Recived message address |
237 | * @return Recived message address |
203 | * - to distinguish between call and answer, look at call->flags |
238 | * - to distinguish between call and answer, look at call->flags |
204 | */ |
239 | */ |
205 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
240 | call_t * ipc_wait_for_call(answerbox_t *box, int flags) |
206 | { |
241 | { |
207 | call_t *request; |
242 | call_t *request; |
208 | 243 | ||
209 | spinlock_lock(&box->lock); |
244 | spinlock_lock(&box->lock); |
210 | while (1) { |
245 | while (1) { |
211 | if (!list_empty(&box->answers)) { |
246 | if (!list_empty(&box->answers)) { |
212 | /* Handle asynchronous answers */ |
247 | /* Handle asynchronous answers */ |
213 | request = list_get_instance(box->answers.next, call_t, list); |
248 | request = list_get_instance(box->answers.next, call_t, list); |
214 | list_remove(&request->list); |
249 | list_remove(&request->list); |
215 | } else if (!list_empty(&box->calls)) { |
250 | } else if (!list_empty(&box->calls)) { |
216 | /* Handle requests */ |
251 | /* Handle requests */ |
217 | request = list_get_instance(box->calls.next, call_t, list); |
252 | request = list_get_instance(box->calls.next, call_t, list); |
218 | list_remove(&request->list); |
253 | list_remove(&request->list); |
219 | /* Append request to dispatch queue */ |
254 | /* Append request to dispatch queue */ |
220 | list_append(&request->list, &box->dispatched_calls); |
255 | list_append(&request->list, &box->dispatched_calls); |
221 | request->flags |= IPC_CALL_DISPATCHED; |
256 | request->flags |= IPC_CALL_DISPATCHED; |
222 | } else { |
257 | } else { |
223 | if (!(flags & IPC_WAIT_NONBLOCKING)) { |
258 | if (!(flags & IPC_WAIT_NONBLOCKING)) { |
224 | /* Wait for event to appear */ |
259 | /* Wait for event to appear */ |
225 | spinlock_unlock(&box->lock); |
260 | spinlock_unlock(&box->lock); |
226 | waitq_sleep(&box->wq); |
261 | waitq_sleep(&box->wq); |
227 | spinlock_lock(&box->lock); |
262 | spinlock_lock(&box->lock); |
228 | continue; |
263 | continue; |
229 | } |
264 | } |
230 | request = NULL; |
265 | request = NULL; |
231 | } |
266 | } |
232 | break; |
267 | break; |
233 | } |
268 | } |
234 | spinlock_unlock(&box->lock); |
269 | spinlock_unlock(&box->lock); |
235 | return request; |
270 | return request; |
236 | } |
271 | } |
237 | 272 | ||
238 | /** Initilize ipc subsystem */ |
273 | /** Initilize ipc subsystem */ |
239 | void ipc_init(void) |
274 | void ipc_init(void) |
240 | { |
275 | { |
241 | ipc_call_slab = slab_cache_create("ipc_call", |
276 | ipc_call_slab = slab_cache_create("ipc_call", |
242 | sizeof(call_t), |
277 | sizeof(call_t), |
243 | 0, |
278 | 0, |
244 | NULL, NULL, 0); |
279 | NULL, NULL, 0); |
245 | } |
280 | } |
246 | 281 | ||
247 | /** Cleans up all IPC communication of the given task |
282 | /** Cleans up all IPC communication of the given task |
248 | * |
283 | * |
249 | * |
284 | * |
250 | */ |
285 | */ |
251 | void ipc_cleanup(task_t *task) |
286 | void ipc_cleanup(task_t *task) |
252 | { |
287 | { |
253 | /* Cancel all calls in my dispatch queue */ |
288 | /* Cancel all calls in my dispatch queue */ |
254 | 289 | ||
255 | } |
290 | } |
256 | 291 |