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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 <synch/synch.h> |
36 | #include <synch/synch.h> |
37 | #include <ipc/ipc.h> |
37 | #include <ipc/ipc.h> |
38 | #include <errno.h> |
38 | #include <errno.h> |
39 | #include <mm/slab.h> |
39 | #include <mm/slab.h> |
40 | #include <arch.h> |
40 | #include <arch.h> |
41 | #include <proc/task.h> |
41 | #include <proc/task.h> |
42 | #include <memstr.h> |
42 | #include <memstr.h> |
43 | #include <debug.h> |
43 | #include <debug.h> |
44 | 44 | ||
45 | #include <print.h> |
45 | #include <print.h> |
46 | #include <proc/thread.h> |
46 | #include <proc/thread.h> |
47 | #include <arch/interrupt.h> |
47 | #include <arch/interrupt.h> |
48 | #include <ipc/irq.h> |
48 | #include <ipc/irq.h> |
49 | 49 | ||
50 | /* Open channel that is assigned automatically to new tasks */ |
50 | /* Open channel that is assigned automatically to new tasks */ |
51 | answerbox_t *ipc_phone_0 = NULL; |
51 | answerbox_t *ipc_phone_0 = NULL; |
52 | 52 | ||
53 | static slab_cache_t *ipc_call_slab; |
53 | static slab_cache_t *ipc_call_slab; |
54 | 54 | ||
55 | /* Initialize new call */ |
55 | /* Initialize new call */ |
56 | static void _ipc_call_init(call_t *call) |
56 | static void _ipc_call_init(call_t *call) |
57 | { |
57 | { |
58 | memsetb((__address)call, sizeof(*call), 0); |
58 | memsetb((__address)call, sizeof(*call), 0); |
59 | call->callerbox = &TASK->answerbox; |
59 | call->callerbox = &TASK->answerbox; |
60 | call->sender = TASK; |
60 | call->sender = TASK; |
61 | } |
61 | } |
62 | 62 | ||
63 | /** Allocate & initialize call structure |
63 | /** Allocate & initialize call structure |
64 | * |
64 | * |
65 | * The call is initialized, so that the reply will be directed |
65 | * The call is initialized, so that the reply will be directed |
66 | * to TASK->answerbox |
66 | * to TASK->answerbox |
67 | * |
67 | * |
68 | * @param flags Parameters for slab_alloc (ATOMIC, etc.) |
68 | * @param flags Parameters for slab_alloc (ATOMIC, etc.) |
69 | */ |
69 | */ |
70 | call_t * ipc_call_alloc(int flags) |
70 | call_t * ipc_call_alloc(int flags) |
71 | { |
71 | { |
72 | call_t *call; |
72 | call_t *call; |
73 | 73 | ||
74 | call = slab_alloc(ipc_call_slab, flags); |
74 | call = slab_alloc(ipc_call_slab, flags); |
75 | _ipc_call_init(call); |
75 | _ipc_call_init(call); |
76 | 76 | ||
77 | return call; |
77 | return call; |
78 | } |
78 | } |
79 | 79 | ||
80 | /** Initialize allocated call */ |
80 | /** Initialize allocated call */ |
81 | void ipc_call_static_init(call_t *call) |
81 | void ipc_call_static_init(call_t *call) |
82 | { |
82 | { |
83 | _ipc_call_init(call); |
83 | _ipc_call_init(call); |
84 | call->flags |= IPC_CALL_STATIC_ALLOC; |
84 | call->flags |= IPC_CALL_STATIC_ALLOC; |
85 | } |
85 | } |
86 | 86 | ||
87 | /** Deallocate call stracuture */ |
87 | /** Deallocate call stracuture */ |
88 | void ipc_call_free(call_t *call) |
88 | void ipc_call_free(call_t *call) |
89 | { |
89 | { |
90 | slab_free(ipc_call_slab, call); |
90 | slab_free(ipc_call_slab, call); |
91 | } |
91 | } |
92 | 92 | ||
93 | /** Initialize answerbox structure |
93 | /** Initialize answerbox structure |
94 | */ |
94 | */ |
95 | void ipc_answerbox_init(answerbox_t *box) |
95 | void ipc_answerbox_init(answerbox_t *box) |
96 | { |
96 | { |
97 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
97 | spinlock_initialize(&box->lock, "ipc_box_lock"); |
98 | spinlock_initialize(&box->irq_lock, "ipc_box_irqlock"); |
98 | spinlock_initialize(&box->irq_lock, "ipc_box_irqlock"); |
99 | waitq_initialize(&box->wq); |
99 | waitq_initialize(&box->wq); |
100 | list_initialize(&box->connected_phones); |
100 | list_initialize(&box->connected_phones); |
101 | list_initialize(&box->calls); |
101 | list_initialize(&box->calls); |
102 | list_initialize(&box->dispatched_calls); |
102 | list_initialize(&box->dispatched_calls); |
103 | list_initialize(&box->answers); |
103 | list_initialize(&box->answers); |
104 | list_initialize(&box->irq_notifs); |
104 | list_initialize(&box->irq_notifs); |
105 | box->task = TASK; |
105 | box->task = TASK; |
106 | } |
106 | } |
107 | 107 | ||
108 | /** Connect phone to answerbox */ |
108 | /** Connect phone to answerbox */ |
109 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
109 | void ipc_phone_connect(phone_t *phone, answerbox_t *box) |
110 | { |
110 | { |
111 | spinlock_lock(&phone->lock); |
111 | spinlock_lock(&phone->lock); |
112 | 112 | ||
113 | ASSERT(!phone->callee); |
113 | ASSERT(!phone->callee); |
114 | phone->busy = IPC_BUSY_CONNECTED; |
114 | phone->busy = IPC_BUSY_CONNECTED; |
115 | phone->callee = box; |
115 | phone->callee = box; |
116 | 116 | ||
117 | spinlock_lock(&box->lock); |
117 | spinlock_lock(&box->lock); |
118 | list_append(&phone->list, &box->connected_phones); |
118 | list_append(&phone->list, &box->connected_phones); |
119 | spinlock_unlock(&box->lock); |
119 | spinlock_unlock(&box->lock); |
120 | 120 | ||
121 | spinlock_unlock(&phone->lock); |
121 | spinlock_unlock(&phone->lock); |
122 | } |
122 | } |
123 | 123 | ||
124 | /** Initialize phone structure and connect phone to answerbox |
124 | /** Initialize phone structure and connect phone to answerbox |
125 | */ |
125 | */ |
126 | void ipc_phone_init(phone_t *phone) |
126 | void ipc_phone_init(phone_t *phone) |
127 | { |
127 | { |
128 | spinlock_initialize(&phone->lock, "phone_lock"); |
128 | spinlock_initialize(&phone->lock, "phone_lock"); |
129 | phone->callee = NULL; |
129 | phone->callee = NULL; |
130 | phone->busy = IPC_BUSY_FREE; |
130 | phone->busy = IPC_BUSY_FREE; |
131 | atomic_set(&phone->active_calls, 0); |
131 | atomic_set(&phone->active_calls, 0); |
132 | } |
132 | } |
133 | 133 | ||
134 | /** Helper function to facilitate synchronous calls */ |
134 | /** Helper function to facilitate synchronous calls */ |
135 | void ipc_call_sync(phone_t *phone, call_t *request) |
135 | void ipc_call_sync(phone_t *phone, call_t *request) |
136 | { |
136 | { |
137 | answerbox_t sync_box; |
137 | answerbox_t sync_box; |
138 | 138 | ||
139 | ipc_answerbox_init(&sync_box); |
139 | ipc_answerbox_init(&sync_box); |
140 | 140 | ||
141 | /* We will receive data on special box */ |
141 | /* We will receive data on special box */ |
142 | request->callerbox = &sync_box; |
142 | request->callerbox = &sync_box; |
143 | 143 | ||
144 | ipc_call(phone, request); |
144 | ipc_call(phone, request); |
145 | ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_BLOCKING); |
145 | ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
146 | } |
146 | } |
147 | 147 | ||
148 | /** Answer message that was not dispatched and is not entered in |
148 | /** Answer message that was not dispatched and is not entered in |
149 | * any queue |
149 | * any queue |
150 | */ |
150 | */ |
151 | static void _ipc_answer_free_call(call_t *call) |
151 | static void _ipc_answer_free_call(call_t *call) |
152 | { |
152 | { |
153 | answerbox_t *callerbox = call->callerbox; |
153 | answerbox_t *callerbox = call->callerbox; |
154 | 154 | ||
155 | call->flags |= IPC_CALL_ANSWERED; |
155 | call->flags |= IPC_CALL_ANSWERED; |
156 | 156 | ||
157 | spinlock_lock(&callerbox->lock); |
157 | spinlock_lock(&callerbox->lock); |
158 | list_append(&call->list, &callerbox->answers); |
158 | list_append(&call->list, &callerbox->answers); |
159 | spinlock_unlock(&callerbox->lock); |
159 | spinlock_unlock(&callerbox->lock); |
160 | waitq_wakeup(&callerbox->wq, 0); |
160 | waitq_wakeup(&callerbox->wq, 0); |
161 | } |
161 | } |
162 | 162 | ||
163 | /** Answer message, that is in callee queue |
163 | /** Answer message, that is in callee queue |
164 | * |
164 | * |
165 | * @param box Answerbox that is answering the message |
165 | * @param box Answerbox that is answering the message |
166 | * @param call Modified request that is being sent back |
166 | * @param call Modified request that is being sent back |
167 | */ |
167 | */ |
168 | void ipc_answer(answerbox_t *box, call_t *call) |
168 | void ipc_answer(answerbox_t *box, call_t *call) |
169 | { |
169 | { |
170 | /* Remove from active box */ |
170 | /* Remove from active box */ |
171 | spinlock_lock(&box->lock); |
171 | spinlock_lock(&box->lock); |
172 | list_remove(&call->list); |
172 | list_remove(&call->list); |
173 | spinlock_unlock(&box->lock); |
173 | spinlock_unlock(&box->lock); |
174 | /* Send back answer */ |
174 | /* Send back answer */ |
175 | _ipc_answer_free_call(call); |
175 | _ipc_answer_free_call(call); |
176 | } |
176 | } |
177 | 177 | ||
178 | /** Simulate sending back a message |
178 | /** Simulate sending back a message |
179 | * |
179 | * |
180 | * Most errors are better handled by forming a normal backward |
180 | * Most errors are better handled by forming a normal backward |
181 | * message and sending it as a normal answer. |
181 | * message and sending it as a normal answer. |
182 | */ |
182 | */ |
183 | void ipc_backsend_err(phone_t *phone, call_t *call, __native err) |
183 | void ipc_backsend_err(phone_t *phone, call_t *call, __native err) |
184 | { |
184 | { |
185 | call->data.phone = phone; |
185 | call->data.phone = phone; |
186 | atomic_inc(&phone->active_calls); |
186 | atomic_inc(&phone->active_calls); |
187 | if (phone->busy == IPC_BUSY_CONNECTED) |
187 | if (phone->busy == IPC_BUSY_CONNECTED) |
188 | IPC_SET_RETVAL(call->data, EHANGUP); |
188 | IPC_SET_RETVAL(call->data, EHANGUP); |
189 | else |
189 | else |
190 | IPC_SET_RETVAL(call->data, ENOENT); |
190 | IPC_SET_RETVAL(call->data, ENOENT); |
191 | 191 | ||
192 | _ipc_answer_free_call(call); |
192 | _ipc_answer_free_call(call); |
193 | } |
193 | } |
194 | 194 | ||
195 | /* Unsafe unchecking ipc_call */ |
195 | /* Unsafe unchecking ipc_call */ |
196 | static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call) |
196 | static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call) |
197 | { |
197 | { |
198 | if (! (call->flags & IPC_CALL_FORWARDED)) { |
198 | if (! (call->flags & IPC_CALL_FORWARDED)) { |
199 | atomic_inc(&phone->active_calls); |
199 | atomic_inc(&phone->active_calls); |
200 | call->data.phone = phone; |
200 | call->data.phone = phone; |
201 | } |
201 | } |
202 | 202 | ||
203 | spinlock_lock(&box->lock); |
203 | spinlock_lock(&box->lock); |
204 | list_append(&call->list, &box->calls); |
204 | list_append(&call->list, &box->calls); |
205 | spinlock_unlock(&box->lock); |
205 | spinlock_unlock(&box->lock); |
206 | waitq_wakeup(&box->wq, 0); |
206 | waitq_wakeup(&box->wq, 0); |
207 | } |
207 | } |
208 | 208 | ||
209 | /** Send a asynchronous request using phone to answerbox |
209 | /** Send a asynchronous request using phone to answerbox |
210 | * |
210 | * |
211 | * @param phone Phone connected to answerbox |
211 | * @param phone Phone connected to answerbox |
212 | * @param request Request to be sent |
212 | * @param request Request to be sent |
213 | */ |
213 | */ |
214 | int ipc_call(phone_t *phone, call_t *call) |
214 | int ipc_call(phone_t *phone, call_t *call) |
215 | { |
215 | { |
216 | answerbox_t *box; |
216 | answerbox_t *box; |
217 | 217 | ||
218 | spinlock_lock(&phone->lock); |
218 | spinlock_lock(&phone->lock); |
219 | 219 | ||
220 | box = phone->callee; |
220 | box = phone->callee; |
221 | if (!box) { |
221 | if (!box) { |
222 | /* Trying to send over disconnected phone */ |
222 | /* Trying to send over disconnected phone */ |
223 | spinlock_unlock(&phone->lock); |
223 | spinlock_unlock(&phone->lock); |
224 | if (call->flags & IPC_CALL_FORWARDED) { |
224 | if (call->flags & IPC_CALL_FORWARDED) { |
225 | IPC_SET_RETVAL(call->data, EFORWARD); |
225 | IPC_SET_RETVAL(call->data, EFORWARD); |
226 | _ipc_answer_free_call(call); |
226 | _ipc_answer_free_call(call); |
227 | } else { /* Simulate sending back a message */ |
227 | } else { /* Simulate sending back a message */ |
228 | if (phone->busy == IPC_BUSY_CONNECTED) |
228 | if (phone->busy == IPC_BUSY_CONNECTED) |
229 | ipc_backsend_err(phone, call, EHANGUP); |
229 | ipc_backsend_err(phone, call, EHANGUP); |
230 | else |
230 | else |
231 | ipc_backsend_err(phone, call, ENOENT); |
231 | ipc_backsend_err(phone, call, ENOENT); |
232 | } |
232 | } |
233 | 233 | ||
234 | return ENOENT; |
234 | return ENOENT; |
235 | } |
235 | } |
236 | _ipc_call(phone, box, call); |
236 | _ipc_call(phone, box, call); |
237 | 237 | ||
238 | spinlock_unlock(&phone->lock); |
238 | spinlock_unlock(&phone->lock); |
239 | return 0; |
239 | return 0; |
240 | } |
240 | } |
241 | 241 | ||
242 | /** Disconnect phone from answerbox |
242 | /** Disconnect phone from answerbox |
243 | * |
243 | * |
244 | * It is allowed to call disconnect on already disconnected phone |
244 | * It is allowed to call disconnect on already disconnected phone |
245 | * |
245 | * |
246 | * @return 0 - phone disconnected, -1 - the phone was already disconnected |
246 | * @return 0 - phone disconnected, -1 - the phone was already disconnected |
247 | */ |
247 | */ |
248 | int ipc_phone_hangup(phone_t *phone) |
248 | int ipc_phone_hangup(phone_t *phone) |
249 | { |
249 | { |
250 | answerbox_t *box; |
250 | answerbox_t *box; |
251 | call_t *call; |
251 | call_t *call; |
252 | 252 | ||
253 | spinlock_lock(&phone->lock); |
253 | spinlock_lock(&phone->lock); |
254 | box = phone->callee; |
254 | box = phone->callee; |
255 | if (!box) { |
255 | if (!box) { |
256 | if (phone->busy == IPC_BUSY_CONNECTING) { |
256 | if (phone->busy == IPC_BUSY_CONNECTING) { |
257 | spinlock_unlock(&phone->lock); |
257 | spinlock_unlock(&phone->lock); |
258 | return -1; |
258 | return -1; |
259 | } |
259 | } |
260 | /* Already disconnected phone */ |
260 | /* Already disconnected phone */ |
261 | phone->busy = IPC_BUSY_FREE; |
261 | phone->busy = IPC_BUSY_FREE; |
262 | spinlock_unlock(&phone->lock); |
262 | spinlock_unlock(&phone->lock); |
263 | return 0; |
263 | return 0; |
264 | } |
264 | } |
265 | 265 | ||
266 | spinlock_lock(&box->lock); |
266 | spinlock_lock(&box->lock); |
267 | list_remove(&phone->list); |
267 | list_remove(&phone->list); |
268 | phone->callee = NULL; |
268 | phone->callee = NULL; |
269 | spinlock_unlock(&box->lock); |
269 | spinlock_unlock(&box->lock); |
270 | 270 | ||
271 | call = ipc_call_alloc(0); |
271 | call = ipc_call_alloc(0); |
272 | IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP); |
272 | IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP); |
273 | call->flags |= IPC_CALL_DISCARD_ANSWER; |
273 | call->flags |= IPC_CALL_DISCARD_ANSWER; |
274 | _ipc_call(phone, box, call); |
274 | _ipc_call(phone, box, call); |
275 | 275 | ||
276 | phone->busy = IPC_BUSY_FREE; |
276 | phone->busy = IPC_BUSY_FREE; |
277 | 277 | ||
278 | spinlock_unlock(&phone->lock); |
278 | spinlock_unlock(&phone->lock); |
279 | 279 | ||
280 | return 0; |
280 | return 0; |
281 | } |
281 | } |
282 | 282 | ||
283 | /** Forwards call from one answerbox to a new one |
283 | /** Forwards call from one answerbox to a new one |
284 | * |
284 | * |
285 | * @param call Call to be redirected. |
285 | * @param call Call to be redirected. |
286 | * @param newphone Phone to target answerbox. |
286 | * @param newphone Phone to target answerbox. |
287 | * @param oldbox Old answerbox |
287 | * @param oldbox Old answerbox |
288 | * @return 0 on forward ok, error code, if there was error |
288 | * @return 0 on forward ok, error code, if there was error |
289 | * |
289 | * |
290 | * - the return value serves only as an information for the forwarder, |
290 | * - the return value serves only as an information for the forwarder, |
291 | * the original caller is notified automatically with EFORWARD |
291 | * the original caller is notified automatically with EFORWARD |
292 | */ |
292 | */ |
293 | int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox) |
293 | int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox) |
294 | { |
294 | { |
295 | spinlock_lock(&oldbox->lock); |
295 | spinlock_lock(&oldbox->lock); |
296 | list_remove(&call->list); |
296 | list_remove(&call->list); |
297 | spinlock_unlock(&oldbox->lock); |
297 | spinlock_unlock(&oldbox->lock); |
298 | 298 | ||
299 | return ipc_call(newphone, call); |
299 | return ipc_call(newphone, call); |
300 | } |
300 | } |
301 | 301 | ||
302 | 302 | ||
303 | /** Wait for phone call |
303 | /** Wait for phone call |
304 | * |
304 | * |
305 | * @param box Answerbox expecting the call. |
305 | * @param box Answerbox expecting the call. |
306 | * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for |
306 | * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for |
307 | * decription of its special meaning. |
307 | * decription of its special meaning. |
308 | * @param nonblocking Blocking vs. non-blocking operation mode switch. See documentation |
308 | * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i |
309 | * for waitq_sleep_timeout() for description of its special meaning. |
309 | * for description of its special meaning. |
310 | * @return Recived message address |
310 | * @return Recived message address |
311 | * - to distinguish between call and answer, look at call->flags |
311 | * - to distinguish between call and answer, look at call->flags |
312 | */ |
312 | */ |
313 | call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int nonblocking) |
313 | call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags) |
314 | { |
314 | { |
315 | call_t *request; |
315 | call_t *request; |
316 | ipl_t ipl; |
316 | ipl_t ipl; |
317 | int rc; |
317 | int rc; |
318 | 318 | ||
319 | restart: |
319 | restart: |
320 | rc = waitq_sleep_timeout(&box->wq, usec, nonblocking); |
320 | rc = waitq_sleep_timeout(&box->wq, usec, flags); |
321 | if (SYNCH_FAILED(rc)) |
321 | if (SYNCH_FAILED(rc)) |
322 | return NULL; |
322 | return NULL; |
323 | 323 | ||
324 | spinlock_lock(&box->lock); |
324 | spinlock_lock(&box->lock); |
325 | if (!list_empty(&box->irq_notifs)) { |
325 | if (!list_empty(&box->irq_notifs)) { |
326 | ipl = interrupts_disable(); |
326 | ipl = interrupts_disable(); |
327 | spinlock_lock(&box->irq_lock); |
327 | spinlock_lock(&box->irq_lock); |
328 | 328 | ||
329 | request = list_get_instance(box->irq_notifs.next, call_t, list); |
329 | request = list_get_instance(box->irq_notifs.next, call_t, list); |
330 | list_remove(&request->list); |
330 | list_remove(&request->list); |
331 | 331 | ||
332 | spinlock_unlock(&box->irq_lock); |
332 | spinlock_unlock(&box->irq_lock); |
333 | interrupts_restore(ipl); |
333 | interrupts_restore(ipl); |
334 | } else if (!list_empty(&box->answers)) { |
334 | } else if (!list_empty(&box->answers)) { |
335 | /* Handle asynchronous answers */ |
335 | /* Handle asynchronous answers */ |
336 | request = list_get_instance(box->answers.next, call_t, list); |
336 | request = list_get_instance(box->answers.next, call_t, list); |
337 | list_remove(&request->list); |
337 | list_remove(&request->list); |
338 | atomic_dec(&request->data.phone->active_calls); |
338 | atomic_dec(&request->data.phone->active_calls); |
339 | } else if (!list_empty(&box->calls)) { |
339 | } else if (!list_empty(&box->calls)) { |
340 | /* Handle requests */ |
340 | /* Handle requests */ |
341 | request = list_get_instance(box->calls.next, call_t, list); |
341 | request = list_get_instance(box->calls.next, call_t, list); |
342 | list_remove(&request->list); |
342 | list_remove(&request->list); |
343 | /* Append request to dispatch queue */ |
343 | /* Append request to dispatch queue */ |
344 | list_append(&request->list, &box->dispatched_calls); |
344 | list_append(&request->list, &box->dispatched_calls); |
345 | } else { |
345 | } else { |
346 | /* This can happen regularly after ipc_cleanup, remove |
346 | /* This can happen regularly after ipc_cleanup, remove |
347 | * the warning in the future when the IPC is |
347 | * the warning in the future when the IPC is |
348 | * more debugged */ |
348 | * more debugged */ |
349 | printf("WARNING: Spurious IPC wakeup.\n"); |
349 | printf("WARNING: Spurious IPC wakeup.\n"); |
350 | spinlock_unlock(&box->lock); |
350 | spinlock_unlock(&box->lock); |
351 | goto restart; |
351 | goto restart; |
352 | } |
352 | } |
353 | spinlock_unlock(&box->lock); |
353 | spinlock_unlock(&box->lock); |
354 | return request; |
354 | return request; |
355 | } |
355 | } |
356 | 356 | ||
357 | /** Answer all calls from list with EHANGUP msg */ |
357 | /** Answer all calls from list with EHANGUP msg */ |
358 | static void ipc_cleanup_call_list(link_t *lst) |
358 | static void ipc_cleanup_call_list(link_t *lst) |
359 | { |
359 | { |
360 | call_t *call; |
360 | call_t *call; |
361 | 361 | ||
362 | while (!list_empty(lst)) { |
362 | while (!list_empty(lst)) { |
363 | call = list_get_instance(lst->next, call_t, list); |
363 | call = list_get_instance(lst->next, call_t, list); |
364 | list_remove(&call->list); |
364 | list_remove(&call->list); |
365 | 365 | ||
366 | IPC_SET_RETVAL(call->data, EHANGUP); |
366 | IPC_SET_RETVAL(call->data, EHANGUP); |
367 | _ipc_answer_free_call(call); |
367 | _ipc_answer_free_call(call); |
368 | } |
368 | } |
369 | } |
369 | } |
370 | 370 | ||
371 | /** Cleans up all IPC communication of the given task |
371 | /** Cleans up all IPC communication of the given task |
372 | * |
372 | * |
373 | * |
373 | * |
374 | */ |
374 | */ |
375 | void ipc_cleanup(task_t *task) |
375 | void ipc_cleanup(task_t *task) |
376 | { |
376 | { |
377 | int i; |
377 | int i; |
378 | call_t *call; |
378 | call_t *call; |
379 | phone_t *phone; |
379 | phone_t *phone; |
380 | 380 | ||
381 | /* Disconnect all our phones ('ipc_phone_hangup') */ |
381 | /* Disconnect all our phones ('ipc_phone_hangup') */ |
382 | for (i=0;i < IPC_MAX_PHONES; i++) |
382 | for (i=0;i < IPC_MAX_PHONES; i++) |
383 | ipc_phone_hangup(&task->phones[i]); |
383 | ipc_phone_hangup(&task->phones[i]); |
384 | 384 | ||
385 | /* Disconnect all connected irqs */ |
385 | /* Disconnect all connected irqs */ |
386 | ipc_irq_cleanup(&task->answerbox); |
386 | ipc_irq_cleanup(&task->answerbox); |
387 | 387 | ||
388 | /* Disconnect all phones connected to our answerbox */ |
388 | /* Disconnect all phones connected to our answerbox */ |
389 | restart_phones: |
389 | restart_phones: |
390 | spinlock_lock(&task->answerbox.lock); |
390 | spinlock_lock(&task->answerbox.lock); |
391 | while (!list_empty(&task->answerbox.connected_phones)) { |
391 | while (!list_empty(&task->answerbox.connected_phones)) { |
392 | phone = list_get_instance(task->answerbox.connected_phones.next, |
392 | phone = list_get_instance(task->answerbox.connected_phones.next, |
393 | phone_t, |
393 | phone_t, |
394 | list); |
394 | list); |
395 | if (! spinlock_trylock(&phone->lock)) { |
395 | if (! spinlock_trylock(&phone->lock)) { |
396 | spinlock_unlock(&task->answerbox.lock); |
396 | spinlock_unlock(&task->answerbox.lock); |
397 | goto restart_phones; |
397 | goto restart_phones; |
398 | } |
398 | } |
399 | 399 | ||
400 | /* Disconnect phone */ |
400 | /* Disconnect phone */ |
401 | phone->callee = NULL; |
401 | phone->callee = NULL; |
402 | list_remove(&phone->list); |
402 | list_remove(&phone->list); |
403 | 403 | ||
404 | spinlock_unlock(&phone->lock); |
404 | spinlock_unlock(&phone->lock); |
405 | } |
405 | } |
406 | 406 | ||
407 | /* Answer all messages in 'calls' and 'dispatched_calls' queues */ |
407 | /* Answer all messages in 'calls' and 'dispatched_calls' queues */ |
408 | spinlock_lock(&task->answerbox.lock); |
408 | spinlock_lock(&task->answerbox.lock); |
409 | ipc_cleanup_call_list(&task->answerbox.dispatched_calls); |
409 | ipc_cleanup_call_list(&task->answerbox.dispatched_calls); |
410 | ipc_cleanup_call_list(&task->answerbox.calls); |
410 | ipc_cleanup_call_list(&task->answerbox.calls); |
411 | spinlock_unlock(&task->answerbox.lock); |
411 | spinlock_unlock(&task->answerbox.lock); |
412 | 412 | ||
413 | /* Wait for all async answers to arrive */ |
413 | /* Wait for all async answers to arrive */ |
414 | while (atomic_get(&task->active_calls)) { |
414 | while (atomic_get(&task->active_calls)) { |
415 | call = ipc_wait_for_call(&task->answerbox, SYNCH_NO_TIMEOUT, SYNCH_BLOCKING); |
415 | call = ipc_wait_for_call(&task->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
416 | ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF)); |
416 | ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF)); |
417 | ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC)); |
417 | ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC)); |
418 | 418 | ||
419 | atomic_dec(&task->active_calls); |
419 | atomic_dec(&task->active_calls); |
420 | ipc_call_free(call); |
420 | ipc_call_free(call); |
421 | } |
421 | } |
422 | } |
422 | } |
423 | 423 | ||
424 | 424 | ||
425 | /** Initilize ipc subsystem */ |
425 | /** Initilize ipc subsystem */ |
426 | void ipc_init(void) |
426 | void ipc_init(void) |
427 | { |
427 | { |
428 | ipc_call_slab = slab_cache_create("ipc_call", |
428 | ipc_call_slab = slab_cache_create("ipc_call", |
429 | sizeof(call_t), |
429 | sizeof(call_t), |
430 | 0, |
430 | 0, |
431 | NULL, NULL, 0); |
431 | NULL, NULL, 0); |
432 | ipc_irq_make_table(IRQ_COUNT); |
432 | ipc_irq_make_table(IRQ_COUNT); |
433 | } |
433 | } |
434 | 434 | ||
435 | 435 |