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1281 palkovsky 1
/*
2
 * Copyright (C) 2006 Ondrej Palkovsky
1923 jermar 3
 * Copyright (C) 2006 Jakub Jermar
1281 palkovsky 4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
1757 jermar 30
/** @addtogroup genericipc
1702 cejka 31
 * @{
32
 */
1757 jermar 33
/**
34
 * @file
35
 * @brief IRQ notification framework.
1284 palkovsky 36
 *
37
 * This framework allows applications to register to receive a notification
38
 * when interrupt is detected. The application may provide a simple 'top-half'
39
 * handler as part of its registration, which can perform simple operations
40
 * (read/write port/memory, add information to notification ipc message).
41
 *
42
 * The structure of a notification message is as follows:
1923 jermar 43
 * - METHOD: method as registered by the SYS_IPC_REGISTER_IRQ syscall
1693 palkovsky 44
 * - ARG1: payload modified by a 'top-half' handler
1923 jermar 45
 * - ARG2: payload modified by a 'top-half' handler
46
 * - ARG3: payload modified by a 'top-half' handler
1693 palkovsky 47
 * - in_phone_hash: interrupt counter (may be needed to assure correct order
1284 palkovsky 48
 *         in multithreaded drivers)
49
 */
50
 
1281 palkovsky 51
#include <arch.h>
52
#include <mm/slab.h>
53
#include <errno.h>
1923 jermar 54
#include <ddi/irq.h>
1281 palkovsky 55
#include <ipc/ipc.h>
56
#include <ipc/irq.h>
1288 jermar 57
#include <syscall/copy.h>
1507 vana 58
#include <console/console.h>
1875 jermar 59
#include <print.h>
1281 palkovsky 60
 
1923 jermar 61
/** Execute code associated with IRQ notification.
62
 *
63
 * @param call Notification call.
64
 * @param code Top-half pseudocode.
65
 */
1281 palkovsky 66
static void code_execute(call_t *call, irq_code_t *code)
67
{
68
    int i;
1780 jermar 69
    unative_t dstval = 0;
1628 decky 70
 
1281 palkovsky 71
    if (!code)
72
        return;
73
 
74
    for (i=0; i < code->cmdcount;i++) {
75
        switch (code->cmds[i].cmd) {
76
        case CMD_MEM_READ_1:
1780 jermar 77
            dstval = *((uint8_t *)code->cmds[i].addr);
1281 palkovsky 78
            break;
79
        case CMD_MEM_READ_2:
1780 jermar 80
            dstval = *((uint16_t *)code->cmds[i].addr);
1281 palkovsky 81
            break;
82
        case CMD_MEM_READ_4:
1780 jermar 83
            dstval = *((uint32_t *)code->cmds[i].addr);
1281 palkovsky 84
            break;
85
        case CMD_MEM_READ_8:
1780 jermar 86
            dstval = *((uint64_t *)code->cmds[i].addr);
1281 palkovsky 87
            break;
88
        case CMD_MEM_WRITE_1:
1780 jermar 89
            *((uint8_t *)code->cmds[i].addr) = code->cmds[i].value;
1281 palkovsky 90
            break;
91
        case CMD_MEM_WRITE_2:
1780 jermar 92
            *((uint16_t *)code->cmds[i].addr) = code->cmds[i].value;
1281 palkovsky 93
            break;
94
        case CMD_MEM_WRITE_4:
1780 jermar 95
            *((uint32_t *)code->cmds[i].addr) = code->cmds[i].value;
1281 palkovsky 96
            break;
97
        case CMD_MEM_WRITE_8:
1780 jermar 98
            *((uint64_t *)code->cmds[i].addr) = code->cmds[i].value;
1281 palkovsky 99
            break;
1284 palkovsky 100
#if defined(ia32) || defined(amd64)
101
        case CMD_PORT_READ_1:
1693 palkovsky 102
            dstval = inb((long)code->cmds[i].addr);
1284 palkovsky 103
            break;
104
        case CMD_PORT_WRITE_1:
105
            outb((long)code->cmds[i].addr, code->cmds[i].value);
106
            break;
107
#endif
1507 vana 108
#if defined(ia64) 
109
        case CMD_IA64_GETCHAR:
1693 palkovsky 110
            dstval = _getc(&ski_uconsole);
1507 vana 111
            break;
112
#endif
1628 decky 113
#if defined(ppc32)
1625 decky 114
        case CMD_PPC32_GETCHAR:
1693 palkovsky 115
            dstval = cuda_get_scancode();
1625 decky 116
            break;
117
#endif
1281 palkovsky 118
        default:
119
            break;
120
        }
1693 palkovsky 121
        if (code->cmds[i].dstarg && code->cmds[i].dstarg < 4) {
122
            call->data.args[code->cmds[i].dstarg] = dstval;
123
        }
1281 palkovsky 124
    }
125
}
126
 
127
static void code_free(irq_code_t *code)
128
{
129
    if (code) {
130
        free(code->cmds);
131
        free(code);
132
    }
133
}
134
 
135
static irq_code_t * code_from_uspace(irq_code_t *ucode)
136
{
137
    irq_code_t *code;
138
    irq_cmd_t *ucmds;
1288 jermar 139
    int rc;
1281 palkovsky 140
 
141
    code = malloc(sizeof(*code), 0);
1288 jermar 142
    rc = copy_from_uspace(code, ucode, sizeof(*code));
143
    if (rc != 0) {
144
        free(code);
145
        return NULL;
146
    }
1281 palkovsky 147
 
148
    if (code->cmdcount > IRQ_MAX_PROG_SIZE) {
149
        free(code);
150
        return NULL;
151
    }
152
    ucmds = code->cmds;
153
    code->cmds = malloc(sizeof(code->cmds[0]) * (code->cmdcount), 0);
1288 jermar 154
    rc = copy_from_uspace(code->cmds, ucmds, sizeof(code->cmds[0]) * (code->cmdcount));
155
    if (rc != 0) {
156
        free(code->cmds);
157
        free(code);
158
        return NULL;
159
    }
1281 palkovsky 160
 
161
    return code;
162
}
163
 
1923 jermar 164
/** Unregister task from IRQ notification.
165
 *
166
 * @param box Answerbox associated with the notification.
167
 * @param inr IRQ numbe.
168
 * @param devno Device number.
169
 */
170
void ipc_irq_unregister(answerbox_t *box, inr_t inr, devno_t devno)
1281 palkovsky 171
{
172
    ipl_t ipl;
1923 jermar 173
    irq_t *irq;
1281 palkovsky 174
 
175
    ipl = interrupts_disable();
1923 jermar 176
    irq = irq_find_and_lock(inr, devno);
177
    if (irq) {
178
        if (irq->notif_cfg.answerbox == box) {
1933 jermar 179
            code_free(irq->notif_cfg.code);
1932 jermar 180
            irq->notif_cfg.notify = false;
181
            irq->notif_cfg.answerbox = NULL;
1923 jermar 182
            irq->notif_cfg.code = NULL;
183
            irq->notif_cfg.method = 0;
184
            irq->notif_cfg.counter = 0;
1933 jermar 185
 
186
            spinlock_lock(&box->irq_lock);
187
            list_remove(&irq->notif_cfg.link);
188
            spinlock_unlock(&box->irq_lock);
189
 
1923 jermar 190
            spinlock_unlock(&irq->lock);
191
        }
1281 palkovsky 192
    }
193
    interrupts_restore(ipl);
194
}
195
 
1923 jermar 196
/** Register an answerbox as a receiving end for IRQ notifications.
197
 *
198
 * @param box Receiving answerbox.
199
 * @param inr IRQ number.
200
 * @param devno Device number.
201
 * @param method Method to be associated with the notification.
202
 * @param ucode Uspace pointer to top-half pseudocode.
203
 *
204
 * @return EBADMEM, ENOENT or EEXISTS on failure or 0 on success.
205
 */
1933 jermar 206
int ipc_irq_register(answerbox_t *box, inr_t inr, devno_t devno, unative_t method, irq_code_t *ucode)
1281 palkovsky 207
{
208
    ipl_t ipl;
209
    irq_code_t *code;
1923 jermar 210
    irq_t *irq;
1281 palkovsky 211
 
212
    if (ucode) {
213
        code = code_from_uspace(ucode);
214
        if (!code)
215
            return EBADMEM;
216
    } else
217
        code = NULL;
218
 
219
    ipl = interrupts_disable();
1923 jermar 220
    irq = irq_find_and_lock(inr, devno);
221
    if (!irq) {
1281 palkovsky 222
        interrupts_restore(ipl);
223
        code_free(code);
1923 jermar 224
        return ENOENT;
225
    }
226
 
227
    if (irq->notif_cfg.answerbox) {
228
        spinlock_unlock(&irq->lock);
229
        interrupts_restore(ipl);
230
        code_free(code);
1281 palkovsky 231
        return EEXISTS;
232
    }
1923 jermar 233
 
1932 jermar 234
    irq->notif_cfg.notify = true;
1923 jermar 235
    irq->notif_cfg.answerbox = box;
236
    irq->notif_cfg.method = method;
237
    irq->notif_cfg.code = code;
238
    irq->notif_cfg.counter = 0;
1933 jermar 239
 
240
    spinlock_lock(&box->irq_lock);
241
    list_append(&irq->notif_cfg.link, &box->irq_head);
242
    spinlock_unlock(&box->irq_lock);
243
 
1923 jermar 244
    spinlock_unlock(&irq->lock);
1281 palkovsky 245
    interrupts_restore(ipl);
246
 
247
    return 0;
248
}
249
 
1923 jermar 250
/** Add call to proper answerbox queue.
1595 palkovsky 251
 *
1923 jermar 252
 * Assume irq->lock is locked.
253
 *
254
 */
255
static void send_call(irq_t *irq, call_t *call)
1595 palkovsky 256
{
1923 jermar 257
    spinlock_lock(&irq->notif_cfg.answerbox->irq_lock);
258
    list_append(&call->link, &irq->notif_cfg.answerbox->irq_notifs);
259
    spinlock_unlock(&irq->notif_cfg.answerbox->irq_lock);
1595 palkovsky 260
 
1923 jermar 261
    waitq_wakeup(&irq->notif_cfg.answerbox->wq, WAKEUP_FIRST);
1595 palkovsky 262
}
263
 
264
/** Send notification message
265
 *
266
 */
1923 jermar 267
void ipc_irq_send_msg(irq_t *irq, unative_t a1, unative_t a2, unative_t a3)
1595 palkovsky 268
{
269
    call_t *call;
270
 
1923 jermar 271
    spinlock_lock(&irq->lock);
1595 palkovsky 272
 
1923 jermar 273
    if (irq->notif_cfg.answerbox) {
1595 palkovsky 274
        call = ipc_call_alloc(FRAME_ATOMIC);
275
        if (!call) {
1923 jermar 276
            spinlock_unlock(&irq->lock);
1595 palkovsky 277
            return;
278
        }
279
        call->flags |= IPC_CALL_NOTIF;
1923 jermar 280
        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
1693 palkovsky 281
        IPC_SET_ARG1(call->data, a1);
1595 palkovsky 282
        IPC_SET_ARG2(call->data, a2);
283
        IPC_SET_ARG3(call->data, a3);
1693 palkovsky 284
        /* Put a counter to the message */
1923 jermar 285
        call->private = ++irq->notif_cfg.counter;
1595 palkovsky 286
 
1923 jermar 287
        send_call(irq, call);
1595 palkovsky 288
    }
1923 jermar 289
    spinlock_unlock(&irq->lock);
1595 palkovsky 290
}
291
 
1698 jermar 292
/** Notify task that an irq had occurred.
1281 palkovsky 293
 *
1923 jermar 294
 * We expect interrupts to be disabled and the irq->lock already held.
1281 palkovsky 295
 */
1923 jermar 296
void ipc_irq_send_notif(irq_t *irq)
1281 palkovsky 297
{
298
    call_t *call;
299
 
1923 jermar 300
    ASSERT(irq);
1281 palkovsky 301
 
1923 jermar 302
    if (irq->notif_cfg.answerbox) {
1281 palkovsky 303
        call = ipc_call_alloc(FRAME_ATOMIC);
1591 palkovsky 304
        if (!call) {
305
            return;
306
        }
1281 palkovsky 307
        call->flags |= IPC_CALL_NOTIF;
1693 palkovsky 308
        /* Put a counter to the message */
1923 jermar 309
        call->private = ++irq->notif_cfg.counter;
1693 palkovsky 310
        /* Set up args */
1923 jermar 311
        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
1281 palkovsky 312
 
313
        /* Execute code to handle irq */
1923 jermar 314
        code_execute(call, irq->notif_cfg.code);
1595 palkovsky 315
 
1923 jermar 316
        send_call(irq, call);
1281 palkovsky 317
    }
318
}
319
 
1923 jermar 320
/** Disconnect all IRQ notifications from an answerbox.
1595 palkovsky 321
 *
1933 jermar 322
 * This function is effective because the answerbox contains
323
 * list of all irq_t structures that are registered to
324
 * send notifications to it.
325
 *
1923 jermar 326
 * @param box Answerbox for which we want to carry out the cleanup.
1595 palkovsky 327
 */
1281 palkovsky 328
void ipc_irq_cleanup(answerbox_t *box)
329
{
1933 jermar 330
    ipl_t ipl;
331
 
332
loop:
333
    ipl = interrupts_disable();
334
    spinlock_lock(&box->irq_lock);
335
 
336
    while (box->irq_head.next != &box->irq_head) {
337
        link_t *cur = box->irq_head.next;
338
        irq_t *irq;
339
 
340
        irq = list_get_instance(cur, irq_t, notif_cfg.link);
341
        if (!spinlock_trylock(&irq->lock)) {
342
            /*
343
             * Avoid deadlock by trying again.
344
             */
345
            spinlock_unlock(&box->irq_lock);
346
            interrupts_restore(ipl);
347
            goto loop;
348
        }
349
 
350
        ASSERT(irq->notif_cfg.answerbox == box);
351
 
352
        list_remove(&irq->notif_cfg.link);
353
 
354
        /*
355
         * Don't forget to free any top-half pseudocode.
356
         */
357
        code_free(irq->notif_cfg.code);
358
 
359
        irq->notif_cfg.notify = false;
360
        irq->notif_cfg.answerbox = NULL;
361
        irq->notif_cfg.code = NULL;
362
        irq->notif_cfg.method = 0;
363
        irq->notif_cfg.counter = 0;
364
 
365
        spinlock_unlock(&irq->lock);
366
    }
367
 
368
    spinlock_unlock(&box->irq_lock);
369
    interrupts_restore(ipl);
1281 palkovsky 370
}
1702 cejka 371
 
1757 jermar 372
/** @}
1702 cejka 373
 */