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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
/** @addtogroup genericipc
29
/** @addtogroup genericipc
30
 * @{
30
 * @{
31
 */
31
 */
32
/** @file
32
/** @file
33
 */
33
 */
34
 
34
 
35
/* Lock ordering
35
/* Lock ordering
36
 *
36
 *
37
 * First the answerbox, then the phone
37
 * First the answerbox, then the phone
38
 */
38
 */
39
 
39
 
40
#include <synch/spinlock.h>
40
#include <synch/spinlock.h>
41
#include <synch/waitq.h>
41
#include <synch/waitq.h>
42
#include <synch/synch.h>
42
#include <synch/synch.h>
43
#include <ipc/ipc.h>
43
#include <ipc/ipc.h>
44
#include <errno.h>
44
#include <errno.h>
45
#include <mm/slab.h>
45
#include <mm/slab.h>
46
#include <arch.h>
46
#include <arch.h>
47
#include <proc/task.h>
47
#include <proc/task.h>
48
#include <memstr.h>
48
#include <memstr.h>
49
#include <debug.h>
49
#include <debug.h>
50
 
50
 
51
#include <print.h>
51
#include <print.h>
52
#include <proc/thread.h>
52
#include <proc/thread.h>
53
#include <arch/interrupt.h>
53
#include <arch/interrupt.h>
54
#include <ipc/irq.h>
54
#include <ipc/irq.h>
55
 
55
 
56
/* Open channel that is assigned automatically to new tasks */
56
/* Open channel that is assigned automatically to new tasks */
57
answerbox_t *ipc_phone_0 = NULL;
57
answerbox_t *ipc_phone_0 = NULL;
58
 
58
 
59
static slab_cache_t *ipc_call_slab;
59
static slab_cache_t *ipc_call_slab;
60
 
60
 
61
/* Initialize new call */
61
/* Initialize new call */
62
static void _ipc_call_init(call_t *call)
62
static void _ipc_call_init(call_t *call)
63
{
63
{
64
    memsetb((uintptr_t)call, sizeof(*call), 0);
64
    memsetb((uintptr_t)call, sizeof(*call), 0);
65
    call->callerbox = &TASK->answerbox;
65
    call->callerbox = &TASK->answerbox;
66
    call->sender = TASK;
66
    call->sender = TASK;
67
}
67
}
68
 
68
 
69
/** Allocate & initialize call structure
69
/** Allocate & initialize call structure
70
 *
70
 *
71
 * The call is initialized, so that the reply will be directed
71
 * The call is initialized, so that the reply will be directed
72
 * to TASK->answerbox
72
 * to TASK->answerbox
73
 *
73
 *
74
 * @param flags Parameters for slab_alloc (ATOMIC, etc.)
74
 * @param flags Parameters for slab_alloc (ATOMIC, etc.)
75
 */
75
 */
76
call_t * ipc_call_alloc(int flags)
76
call_t * ipc_call_alloc(int flags)
77
{
77
{
78
    call_t *call;
78
    call_t *call;
79
 
79
 
80
    call = slab_alloc(ipc_call_slab, flags);
80
    call = slab_alloc(ipc_call_slab, flags);
81
    _ipc_call_init(call);
81
    _ipc_call_init(call);
82
 
82
 
83
    return call;
83
    return call;
84
}
84
}
85
 
85
 
86
/** Initialize allocated call */
86
/** Initialize allocated call */
87
void ipc_call_static_init(call_t *call)
87
void ipc_call_static_init(call_t *call)
88
{
88
{
89
    _ipc_call_init(call);
89
    _ipc_call_init(call);
90
    call->flags |= IPC_CALL_STATIC_ALLOC;
90
    call->flags |= IPC_CALL_STATIC_ALLOC;
91
}
91
}
92
 
92
 
93
/** Deallocate call stracuture */
93
/** Deallocate call stracuture */
94
void ipc_call_free(call_t *call)
94
void ipc_call_free(call_t *call)
95
{
95
{
96
    slab_free(ipc_call_slab, call);
96
    slab_free(ipc_call_slab, call);
97
}
97
}
98
 
98
 
99
/** Initialize answerbox structure
99
/** Initialize answerbox structure
100
 */
100
 */
101
void ipc_answerbox_init(answerbox_t *box)
101
void ipc_answerbox_init(answerbox_t *box)
102
{
102
{
103
    spinlock_initialize(&box->lock, "ipc_box_lock");
103
    spinlock_initialize(&box->lock, "ipc_box_lock");
104
    spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
104
    spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
105
    waitq_initialize(&box->wq);
105
    waitq_initialize(&box->wq);
106
    list_initialize(&box->connected_phones);
106
    list_initialize(&box->connected_phones);
107
    list_initialize(&box->calls);
107
    list_initialize(&box->calls);
108
    list_initialize(&box->dispatched_calls);
108
    list_initialize(&box->dispatched_calls);
109
    list_initialize(&box->answers);
109
    list_initialize(&box->answers);
110
    list_initialize(&box->irq_notifs);
110
    list_initialize(&box->irq_notifs);
111
    list_initialize(&box->irq_head);
111
    list_initialize(&box->irq_head);
112
    box->task = TASK;
112
    box->task = TASK;
113
}
113
}
114
 
114
 
115
/** Connect phone to answerbox */
115
/** Connect phone to answerbox */
116
void ipc_phone_connect(phone_t *phone, answerbox_t *box)
116
void ipc_phone_connect(phone_t *phone, answerbox_t *box)
117
{
117
{
118
    spinlock_lock(&phone->lock);
118
    spinlock_lock(&phone->lock);
119
 
119
 
120
    phone->state = IPC_PHONE_CONNECTED;
120
    phone->state = IPC_PHONE_CONNECTED;
121
    phone->callee = box;
121
    phone->callee = box;
122
 
122
 
123
    spinlock_lock(&box->lock);
123
    spinlock_lock(&box->lock);
124
    list_append(&phone->link, &box->connected_phones);
124
    list_append(&phone->link, &box->connected_phones);
125
    spinlock_unlock(&box->lock);
125
    spinlock_unlock(&box->lock);
126
 
126
 
127
    spinlock_unlock(&phone->lock);
127
    spinlock_unlock(&phone->lock);
128
}
128
}
129
 
129
 
130
/** Initialize phone structure and connect phone to answerbox
130
/** Initialize phone structure and connect phone to answerbox
131
 */
131
 */
132
void ipc_phone_init(phone_t *phone)
132
void ipc_phone_init(phone_t *phone)
133
{
133
{
134
    spinlock_initialize(&phone->lock, "phone_lock");
134
    spinlock_initialize(&phone->lock, "phone_lock");
135
    phone->callee = NULL;
135
    phone->callee = NULL;
136
    phone->state = IPC_PHONE_FREE;
136
    phone->state = IPC_PHONE_FREE;
137
    atomic_set(&phone->active_calls, 0);
137
    atomic_set(&phone->active_calls, 0);
138
}
138
}
139
 
139
 
140
/** Helper function to facilitate synchronous calls */
140
/** Helper function to facilitate synchronous calls */
141
void ipc_call_sync(phone_t *phone, call_t *request)
141
void ipc_call_sync(phone_t *phone, call_t *request)
142
{
142
{
143
    answerbox_t sync_box;
143
    answerbox_t sync_box;
144
 
144
 
145
    ipc_answerbox_init(&sync_box);
145
    ipc_answerbox_init(&sync_box);
146
 
146
 
147
    /* We will receive data on special box */
147
    /* We will receive data on special box */
148
    request->callerbox = &sync_box;
148
    request->callerbox = &sync_box;
149
 
149
 
150
    ipc_call(phone, request);
150
    ipc_call(phone, request);
151
    ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
151
    ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
152
}
152
}
153
 
153
 
154
/** Answer message that was not dispatched and is not entered in
154
/** Answer message that was not dispatched and is not entered in
155
 * any queue
155
 * any queue
156
 */
156
 */
157
static void _ipc_answer_free_call(call_t *call)
157
static void _ipc_answer_free_call(call_t *call)
158
{
158
{
159
    answerbox_t *callerbox = call->callerbox;
159
    answerbox_t *callerbox = call->callerbox;
160
 
160
 
161
    call->flags |= IPC_CALL_ANSWERED;
161
    call->flags |= IPC_CALL_ANSWERED;
162
 
162
 
163
    spinlock_lock(&callerbox->lock);
163
    spinlock_lock(&callerbox->lock);
164
    list_append(&call->link, &callerbox->answers);
164
    list_append(&call->link, &callerbox->answers);
165
    spinlock_unlock(&callerbox->lock);
165
    spinlock_unlock(&callerbox->lock);
166
    waitq_wakeup(&callerbox->wq, 0);
166
    waitq_wakeup(&callerbox->wq, WAKEUP_FIRST);
167
}
167
}
168
 
168
 
169
/** Answer message, that is in callee queue
169
/** Answer message, that is in callee queue
170
 *
170
 *
171
 * @param box Answerbox that is answering the message
171
 * @param box Answerbox that is answering the message
172
 * @param call Modified request that is being sent back
172
 * @param call Modified request that is being sent back
173
 */
173
 */
174
void ipc_answer(answerbox_t *box, call_t *call)
174
void ipc_answer(answerbox_t *box, call_t *call)
175
{
175
{
176
    /* Remove from active box */
176
    /* Remove from active box */
177
    spinlock_lock(&box->lock);
177
    spinlock_lock(&box->lock);
178
    list_remove(&call->link);
178
    list_remove(&call->link);
179
    spinlock_unlock(&box->lock);
179
    spinlock_unlock(&box->lock);
180
    /* Send back answer */
180
    /* Send back answer */
181
    _ipc_answer_free_call(call);
181
    _ipc_answer_free_call(call);
182
}
182
}
183
 
183
 
184
/** Simulate sending back a message
184
/** Simulate sending back a message
185
 *
185
 *
186
 * Most errors are better handled by forming a normal backward
186
 * Most errors are better handled by forming a normal backward
187
 * message and sending it as a normal answer.
187
 * message and sending it as a normal answer.
188
 */
188
 */
189
void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err)
189
void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err)
190
{
190
{
191
    call->data.phone = phone;
191
    call->data.phone = phone;
192
    atomic_inc(&phone->active_calls);
192
    atomic_inc(&phone->active_calls);
193
    IPC_SET_RETVAL(call->data, err);
193
    IPC_SET_RETVAL(call->data, err);
194
    _ipc_answer_free_call(call);
194
    _ipc_answer_free_call(call);
195
}
195
}
196
 
196
 
197
/* Unsafe unchecking ipc_call */
197
/* Unsafe unchecking ipc_call */
198
static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
198
static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
199
{
199
{
200
    if (! (call->flags & IPC_CALL_FORWARDED)) {
200
    if (! (call->flags & IPC_CALL_FORWARDED)) {
201
        atomic_inc(&phone->active_calls);
201
        atomic_inc(&phone->active_calls);
202
        call->data.phone = phone;
202
        call->data.phone = phone;
203
    }
203
    }
204
 
204
 
205
    spinlock_lock(&box->lock);
205
    spinlock_lock(&box->lock);
206
    list_append(&call->link, &box->calls);
206
    list_append(&call->link, &box->calls);
207
    spinlock_unlock(&box->lock);
207
    spinlock_unlock(&box->lock);
208
    waitq_wakeup(&box->wq, 0);
208
    waitq_wakeup(&box->wq, WAKEUP_FIRST);
209
}
209
}
210
 
210
 
211
/** Send a asynchronous request using phone to answerbox
211
/** Send a asynchronous request using phone to answerbox
212
 *
212
 *
213
 * @param phone Phone connected to answerbox.
213
 * @param phone Phone connected to answerbox.
214
 * @param call Structure representing the call.
214
 * @param call Structure representing the call.
215
 */
215
 */
216
int ipc_call(phone_t *phone, call_t *call)
216
int ipc_call(phone_t *phone, call_t *call)
217
{
217
{
218
    answerbox_t *box;
218
    answerbox_t *box;
219
 
219
 
220
    spinlock_lock(&phone->lock);
220
    spinlock_lock(&phone->lock);
221
    if (phone->state != IPC_PHONE_CONNECTED) {
221
    if (phone->state != IPC_PHONE_CONNECTED) {
222
        spinlock_unlock(&phone->lock);
222
        spinlock_unlock(&phone->lock);
223
        if (call->flags & IPC_CALL_FORWARDED) {
223
        if (call->flags & IPC_CALL_FORWARDED) {
224
            IPC_SET_RETVAL(call->data, EFORWARD);
224
            IPC_SET_RETVAL(call->data, EFORWARD);
225
            _ipc_answer_free_call(call);
225
            _ipc_answer_free_call(call);
226
        } else {
226
        } else {
227
            if (phone->state == IPC_PHONE_HUNGUP)
227
            if (phone->state == IPC_PHONE_HUNGUP)
228
                ipc_backsend_err(phone, call, EHANGUP);
228
                ipc_backsend_err(phone, call, EHANGUP);
229
            else
229
            else
230
                ipc_backsend_err(phone, call, ENOENT);
230
                ipc_backsend_err(phone, call, ENOENT);
231
        }
231
        }
232
        return ENOENT;
232
        return ENOENT;
233
    }
233
    }
234
    box = phone->callee;
234
    box = phone->callee;
235
    _ipc_call(phone, box, call);
235
    _ipc_call(phone, box, call);
236
   
236
   
237
    spinlock_unlock(&phone->lock);
237
    spinlock_unlock(&phone->lock);
238
    return 0;
238
    return 0;
239
}
239
}
240
 
240
 
241
/** Disconnect phone from answerbox
241
/** Disconnect phone from answerbox
242
 *
242
 *
243
 * This call leaves the phone in HUNGUP state. The change to 'free' is done
243
 * This call leaves the phone in HUNGUP state. The change to 'free' is done
244
 * lazily later.
244
 * lazily later.
245
 *
245
 *
246
 * @param phone Phone to be hung up
246
 * @param phone Phone to be hung up
247
 *              
247
 *              
248
 * @return 0 - phone disconnected, -1 - the phone was already disconnected
248
 * @return 0 - phone disconnected, -1 - the phone was already disconnected
249
 */
249
 */
250
int ipc_phone_hangup(phone_t *phone)
250
int ipc_phone_hangup(phone_t *phone)
251
{
251
{
252
    answerbox_t *box;
252
    answerbox_t *box;
253
    call_t *call;
253
    call_t *call;
254
   
254
   
255
    spinlock_lock(&phone->lock);
255
    spinlock_lock(&phone->lock);
256
    if (phone->state == IPC_PHONE_FREE || phone->state ==IPC_PHONE_HUNGUP \
256
    if (phone->state == IPC_PHONE_FREE || phone->state ==IPC_PHONE_HUNGUP \
257
        || phone->state == IPC_PHONE_CONNECTING) {
257
        || phone->state == IPC_PHONE_CONNECTING) {
258
        spinlock_unlock(&phone->lock);
258
        spinlock_unlock(&phone->lock);
259
        return -1;
259
        return -1;
260
    }
260
    }
261
    box = phone->callee;
261
    box = phone->callee;
262
    if (phone->state != IPC_PHONE_SLAMMED) {
262
    if (phone->state != IPC_PHONE_SLAMMED) {
263
        /* Remove myself from answerbox */
263
        /* Remove myself from answerbox */
264
        spinlock_lock(&box->lock);
264
        spinlock_lock(&box->lock);
265
        list_remove(&phone->link);
265
        list_remove(&phone->link);
266
        spinlock_unlock(&box->lock);
266
        spinlock_unlock(&box->lock);
267
 
267
 
268
        if (phone->state != IPC_PHONE_SLAMMED) {
268
        if (phone->state != IPC_PHONE_SLAMMED) {
269
            call = ipc_call_alloc(0);
269
            call = ipc_call_alloc(0);
270
            IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
270
            IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
271
            call->flags |= IPC_CALL_DISCARD_ANSWER;
271
            call->flags |= IPC_CALL_DISCARD_ANSWER;
272
            _ipc_call(phone, box, call);
272
            _ipc_call(phone, box, call);
273
        }
273
        }
274
    }
274
    }
275
 
275
 
276
    phone->state = IPC_PHONE_HUNGUP;
276
    phone->state = IPC_PHONE_HUNGUP;
277
    spinlock_unlock(&phone->lock);
277
    spinlock_unlock(&phone->lock);
278
 
278
 
279
    return 0;
279
    return 0;
280
}
280
}
281
 
281
 
282
/** Forwards call from one answerbox to a new one
282
/** Forwards call from one answerbox to a new one
283
 *
283
 *
284
 * @param call Call to be redirected.
284
 * @param call Call to be redirected.
285
 * @param newphone Phone to target answerbox.
285
 * @param newphone Phone to target answerbox.
286
 * @param oldbox Old answerbox
286
 * @param oldbox Old answerbox
287
 * @return 0 on forward ok, error code, if there was error
287
 * @return 0 on forward ok, error code, if there was error
288
 *
288
 *
289
 * - the return value serves only as an information for the forwarder,
289
 * - the return value serves only as an information for the forwarder,
290
 *   the original caller is notified automatically with EFORWARD
290
 *   the original caller is notified automatically with EFORWARD
291
 */
291
 */
292
int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox)
292
int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox)
293
{
293
{
294
    spinlock_lock(&oldbox->lock);
294
    spinlock_lock(&oldbox->lock);
295
    list_remove(&call->link);
295
    list_remove(&call->link);
296
    spinlock_unlock(&oldbox->lock);
296
    spinlock_unlock(&oldbox->lock);
297
 
297
 
298
    return ipc_call(newphone, call);
298
    return ipc_call(newphone, call);
299
}
299
}
300
 
300
 
301
 
301
 
302
/** Wait for phone call
302
/** Wait for phone call
303
 *
303
 *
304
 * @param box Answerbox expecting the call.
304
 * @param box Answerbox expecting the call.
305
 * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
305
 * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
306
 *         decription of its special meaning.
306
 *         decription of its special meaning.
307
 * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
307
 * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
308
 *      for description of its special meaning.
308
 *      for description of its special meaning.
309
 * @return Recived message address
309
 * @return Recived message address
310
 * - to distinguish between call and answer, look at call->flags
310
 * - to distinguish between call and answer, look at call->flags
311
 */
311
 */
312
call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags)
312
call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags)
313
{
313
{
314
    call_t *request;
314
    call_t *request;
315
    ipl_t ipl;
315
    ipl_t ipl;
316
    int rc;
316
    int rc;
317
 
317
 
318
restart:
318
restart:
319
    rc = waitq_sleep_timeout(&box->wq, usec, flags);
319
    rc = waitq_sleep_timeout(&box->wq, usec, flags);
320
    if (SYNCH_FAILED(rc))
320
    if (SYNCH_FAILED(rc))
321
        return NULL;
321
        return NULL;
322
   
322
   
323
    spinlock_lock(&box->lock);
323
    spinlock_lock(&box->lock);
324
    if (!list_empty(&box->irq_notifs)) {
324
    if (!list_empty(&box->irq_notifs)) {
325
        ipl = interrupts_disable();
325
        ipl = interrupts_disable();
326
        spinlock_lock(&box->irq_lock);
326
        spinlock_lock(&box->irq_lock);
327
 
327
 
328
        request = list_get_instance(box->irq_notifs.next, call_t, link);
328
        request = list_get_instance(box->irq_notifs.next, call_t, link);
329
        list_remove(&request->link);
329
        list_remove(&request->link);
330
 
330
 
331
        spinlock_unlock(&box->irq_lock);
331
        spinlock_unlock(&box->irq_lock);
332
        interrupts_restore(ipl);
332
        interrupts_restore(ipl);
333
    } else if (!list_empty(&box->answers)) {
333
    } else if (!list_empty(&box->answers)) {
334
        /* Handle asynchronous answers */
334
        /* Handle asynchronous answers */
335
        request = list_get_instance(box->answers.next, call_t, link);
335
        request = list_get_instance(box->answers.next, call_t, link);
336
        list_remove(&request->link);
336
        list_remove(&request->link);
337
        atomic_dec(&request->data.phone->active_calls);
337
        atomic_dec(&request->data.phone->active_calls);
338
    } else if (!list_empty(&box->calls)) {
338
    } else if (!list_empty(&box->calls)) {
339
        /* Handle requests */
339
        /* Handle requests */
340
        request = list_get_instance(box->calls.next, call_t, link);
340
        request = list_get_instance(box->calls.next, call_t, link);
341
        list_remove(&request->link);
341
        list_remove(&request->link);
342
        /* Append request to dispatch queue */
342
        /* Append request to dispatch queue */
343
        list_append(&request->link, &box->dispatched_calls);
343
        list_append(&request->link, &box->dispatched_calls);
344
    } else {
344
    } else {
345
        /* This can happen regularly after ipc_cleanup */
345
        /* This can happen regularly after ipc_cleanup */
346
        spinlock_unlock(&box->lock);
346
        spinlock_unlock(&box->lock);
347
        goto restart;
347
        goto restart;
348
    }
348
    }
349
    spinlock_unlock(&box->lock);
349
    spinlock_unlock(&box->lock);
350
    return request;
350
    return request;
351
}
351
}
352
 
352
 
353
/** Answer all calls from list with EHANGUP msg */
353
/** Answer all calls from list with EHANGUP msg */
354
static void ipc_cleanup_call_list(link_t *lst)
354
static void ipc_cleanup_call_list(link_t *lst)
355
{
355
{
356
    call_t *call;
356
    call_t *call;
357
 
357
 
358
    while (!list_empty(lst)) {
358
    while (!list_empty(lst)) {
359
        call = list_get_instance(lst->next, call_t, link);
359
        call = list_get_instance(lst->next, call_t, link);
360
        list_remove(&call->link);
360
        list_remove(&call->link);
361
 
361
 
362
        IPC_SET_RETVAL(call->data, EHANGUP);
362
        IPC_SET_RETVAL(call->data, EHANGUP);
363
        _ipc_answer_free_call(call);
363
        _ipc_answer_free_call(call);
364
    }
364
    }
365
}
365
}
366
 
366
 
367
/** Cleans up all IPC communication of the current task
367
/** Cleans up all IPC communication of the current task
368
 *
368
 *
369
 * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
369
 * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
370
 * have to change it as well if you want to cleanup other current then current.
370
 * have to change it as well if you want to cleanup other current then current.
371
 */
371
 */
372
void ipc_cleanup(void)
372
void ipc_cleanup(void)
373
{
373
{
374
    int i;
374
    int i;
375
    call_t *call;
375
    call_t *call;
376
    phone_t *phone;
376
    phone_t *phone;
377
    DEADLOCK_PROBE_INIT(p_phonelck);
377
    DEADLOCK_PROBE_INIT(p_phonelck);
378
 
378
 
379
    /* Disconnect all our phones ('ipc_phone_hangup') */
379
    /* Disconnect all our phones ('ipc_phone_hangup') */
380
    for (i=0;i < IPC_MAX_PHONES; i++)
380
    for (i=0;i < IPC_MAX_PHONES; i++)
381
        ipc_phone_hangup(&TASK->phones[i]);
381
        ipc_phone_hangup(&TASK->phones[i]);
382
 
382
 
383
    /* Disconnect all connected irqs */
383
    /* Disconnect all connected irqs */
384
    ipc_irq_cleanup(&TASK->answerbox);
384
    ipc_irq_cleanup(&TASK->answerbox);
385
 
385
 
386
    /* Disconnect all phones connected to our answerbox */
386
    /* Disconnect all phones connected to our answerbox */
387
restart_phones:
387
restart_phones:
388
    spinlock_lock(&TASK->answerbox.lock);
388
    spinlock_lock(&TASK->answerbox.lock);
389
    while (!list_empty(&TASK->answerbox.connected_phones)) {
389
    while (!list_empty(&TASK->answerbox.connected_phones)) {
390
        phone = list_get_instance(TASK->answerbox.connected_phones.next,
390
        phone = list_get_instance(TASK->answerbox.connected_phones.next,
391
            phone_t, link);
391
            phone_t, link);
392
        if (! spinlock_trylock(&phone->lock)) {
392
        if (! spinlock_trylock(&phone->lock)) {
393
            spinlock_unlock(&TASK->answerbox.lock);
393
            spinlock_unlock(&TASK->answerbox.lock);
394
            DEADLOCK_PROBE(p_phonelck, DEADLOCK_THRESHOLD);
394
            DEADLOCK_PROBE(p_phonelck, DEADLOCK_THRESHOLD);
395
            goto restart_phones;
395
            goto restart_phones;
396
        }
396
        }
397
       
397
       
398
        /* Disconnect phone */
398
        /* Disconnect phone */
399
        ASSERT(phone->state == IPC_PHONE_CONNECTED);
399
        ASSERT(phone->state == IPC_PHONE_CONNECTED);
400
        phone->state = IPC_PHONE_SLAMMED;
400
        phone->state = IPC_PHONE_SLAMMED;
401
        list_remove(&phone->link);
401
        list_remove(&phone->link);
402
 
402
 
403
        spinlock_unlock(&phone->lock);
403
        spinlock_unlock(&phone->lock);
404
    }
404
    }
405
 
405
 
406
    /* Answer all messages in 'calls' and 'dispatched_calls' queues */
406
    /* Answer all messages in 'calls' and 'dispatched_calls' queues */
407
    ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
407
    ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
408
    ipc_cleanup_call_list(&TASK->answerbox.calls);
408
    ipc_cleanup_call_list(&TASK->answerbox.calls);
409
    spinlock_unlock(&TASK->answerbox.lock);
409
    spinlock_unlock(&TASK->answerbox.lock);
410
   
410
   
411
    /* Wait for all async answers to arrive */
411
    /* Wait for all async answers to arrive */
412
    while (1) {
412
    while (1) {
413
        /* Go through all phones, until all are FREE... */
413
        /* Go through all phones, until all are FREE... */
414
        /* Locking not needed, no one else should modify
414
        /* Locking not needed, no one else should modify
415
         * it, when we are in cleanup */
415
         * it, when we are in cleanup */
416
        for (i=0;i < IPC_MAX_PHONES; i++) {
416
        for (i=0;i < IPC_MAX_PHONES; i++) {
417
            if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
417
            if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
418
                atomic_get(&TASK->phones[i].active_calls) == 0)
418
                atomic_get(&TASK->phones[i].active_calls) == 0)
419
                TASK->phones[i].state = IPC_PHONE_FREE;
419
                TASK->phones[i].state = IPC_PHONE_FREE;
420
           
420
           
421
            /* Just for sure, we might have had some
421
            /* Just for sure, we might have had some
422
             * IPC_PHONE_CONNECTING phones */
422
             * IPC_PHONE_CONNECTING phones */
423
            if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
423
            if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
424
                ipc_phone_hangup(&TASK->phones[i]);
424
                ipc_phone_hangup(&TASK->phones[i]);
425
            /* If the hangup succeeded, it has sent a HANGUP
425
            /* If the hangup succeeded, it has sent a HANGUP
426
             * message, the IPC is now in HUNGUP state, we
426
             * message, the IPC is now in HUNGUP state, we
427
             * wait for the reply to come */
427
             * wait for the reply to come */
428
           
428
           
429
            if (TASK->phones[i].state != IPC_PHONE_FREE)
429
            if (TASK->phones[i].state != IPC_PHONE_FREE)
430
                break;
430
                break;
431
        }
431
        }
432
        /* Voila, got into cleanup */
432
        /* Voila, got into cleanup */
433
        if (i == IPC_MAX_PHONES)
433
        if (i == IPC_MAX_PHONES)
434
            break;
434
            break;
435
       
435
       
436
        call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
436
        call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
437
        ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF));
437
        ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF));
438
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
438
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
439
       
439
       
440
        atomic_dec(&TASK->active_calls);
440
        atomic_dec(&TASK->active_calls);
441
        ipc_call_free(call);
441
        ipc_call_free(call);
442
    }
442
    }
443
}
443
}
444
 
444
 
445
 
445
 
446
/** Initilize IPC subsystem */
446
/** Initilize IPC subsystem */
447
void ipc_init(void)
447
void ipc_init(void)
448
{
448
{
449
    ipc_call_slab = slab_cache_create("ipc_call", sizeof(call_t), 0, NULL, NULL, 0);
449
    ipc_call_slab = slab_cache_create("ipc_call", sizeof(call_t), 0, NULL, NULL, 0);
450
}
450
}
451
 
451
 
452
 
452
 
453
/** Kconsole - list answerbox contents */
453
/** Kconsole - list answerbox contents */
454
void ipc_print_task(task_id_t taskid)
454
void ipc_print_task(task_id_t taskid)
455
{
455
{
456
    task_t *task;
456
    task_t *task;
457
    int i;
457
    int i;
458
    call_t *call;
458
    call_t *call;
459
    link_t *tmp;
459
    link_t *tmp;
460
   
460
   
461
    spinlock_lock(&tasks_lock);
461
    spinlock_lock(&tasks_lock);
462
    task = task_find_by_id(taskid);
462
    task = task_find_by_id(taskid);
463
    if (task)
463
    if (task)
464
        spinlock_lock(&task->lock);
464
        spinlock_lock(&task->lock);
465
    spinlock_unlock(&tasks_lock);
465
    spinlock_unlock(&tasks_lock);
466
    if (!task)
466
    if (!task)
467
        return;
467
        return;
468
 
468
 
469
    /* Print opened phones & details */
469
    /* Print opened phones & details */
470
    printf("PHONE:\n");
470
    printf("PHONE:\n");
471
    for (i=0; i < IPC_MAX_PHONES;i++) {
471
    for (i=0; i < IPC_MAX_PHONES;i++) {
472
        spinlock_lock(&task->phones[i].lock);
472
        spinlock_lock(&task->phones[i].lock);
473
        if (task->phones[i].state != IPC_PHONE_FREE) {
473
        if (task->phones[i].state != IPC_PHONE_FREE) {
474
            printf("%d: ",i);
474
            printf("%d: ",i);
475
            switch (task->phones[i].state) {
475
            switch (task->phones[i].state) {
476
            case IPC_PHONE_CONNECTING:
476
            case IPC_PHONE_CONNECTING:
477
                printf("connecting ");
477
                printf("connecting ");
478
                break;
478
                break;
479
            case IPC_PHONE_CONNECTED:
479
            case IPC_PHONE_CONNECTED:
480
                printf("connected to: %p ",
480
                printf("connected to: %p ",
481
                       task->phones[i].callee);
481
                       task->phones[i].callee);
482
                break;
482
                break;
483
            case IPC_PHONE_SLAMMED:
483
            case IPC_PHONE_SLAMMED:
484
                printf("slammed by: %p ",
484
                printf("slammed by: %p ",
485
                       task->phones[i].callee);
485
                       task->phones[i].callee);
486
                break;
486
                break;
487
            case IPC_PHONE_HUNGUP:
487
            case IPC_PHONE_HUNGUP:
488
                printf("hung up - was: %p ",
488
                printf("hung up - was: %p ",
489
                       task->phones[i].callee);
489
                       task->phones[i].callee);
490
                break;
490
                break;
491
            default:
491
            default:
492
                break;
492
                break;
493
            }
493
            }
494
            printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
494
            printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
495
        }
495
        }
496
        spinlock_unlock(&task->phones[i].lock);
496
        spinlock_unlock(&task->phones[i].lock);
497
    }
497
    }
498
 
498
 
499
 
499
 
500
    /* Print answerbox - calls */
500
    /* Print answerbox - calls */
501
    spinlock_lock(&task->answerbox.lock);
501
    spinlock_lock(&task->answerbox.lock);
502
    printf("ABOX - CALLS:\n");
502
    printf("ABOX - CALLS:\n");
503
    for (tmp=task->answerbox.calls.next; tmp != &task->answerbox.calls;tmp = tmp->next) {
503
    for (tmp=task->answerbox.calls.next; tmp != &task->answerbox.calls;tmp = tmp->next) {
504
        call = list_get_instance(tmp, call_t, link);
504
        call = list_get_instance(tmp, call_t, link);
505
        printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
505
        printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
506
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
506
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
507
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
507
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
508
    }
508
    }
509
    /* Print answerbox - calls */
509
    /* Print answerbox - calls */
510
    printf("ABOX - DISPATCHED CALLS:\n");
510
    printf("ABOX - DISPATCHED CALLS:\n");
511
    for (tmp=task->answerbox.dispatched_calls.next;
511
    for (tmp=task->answerbox.dispatched_calls.next;
512
         tmp != &task->answerbox.dispatched_calls;
512
         tmp != &task->answerbox.dispatched_calls;
513
         tmp = tmp->next) {
513
         tmp = tmp->next) {
514
        call = list_get_instance(tmp, call_t, link);
514
        call = list_get_instance(tmp, call_t, link);
515
        printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
515
        printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
516
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
516
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
517
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
517
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
518
    }
518
    }
519
    /* Print answerbox - calls */
519
    /* Print answerbox - calls */
520
    printf("ABOX - ANSWERS:\n");
520
    printf("ABOX - ANSWERS:\n");
521
    for (tmp=task->answerbox.answers.next; tmp != &task->answerbox.answers; tmp = tmp->next) {
521
    for (tmp=task->answerbox.answers.next; tmp != &task->answerbox.answers; tmp = tmp->next) {
522
        call = list_get_instance(tmp, call_t, link);
522
        call = list_get_instance(tmp, call_t, link);
523
        printf("Callid:%p M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
523
        printf("Callid:%p M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
524
               IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
524
               IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
525
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
525
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
526
    }
526
    }
527
 
527
 
528
    spinlock_unlock(&task->answerbox.lock);
528
    spinlock_unlock(&task->answerbox.lock);
529
    spinlock_unlock(&task->lock);
529
    spinlock_unlock(&task->lock);
530
}
530
}
531
 
531
 
532
/** @}
532
/** @}
533
 */
533
 */
534
 
534