source: mainline/kernel/generic/src/ipc/irq.c@ 119c335

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 119c335 was 6c441cf8, checked in by Martin Decky <martin@…>, 18 years ago

code cleanup (mostly signed/unsigned)
allow extra compiler warnings
  • Property mode set to 100644
File size: 10.2 KB
Line 
1/*
2 * Copyright (c) 2006 Ondrej Palkovsky
3 * Copyright (c) 2006 Jakub Jermar
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
30/** @addtogroup genericipc
31 * @{
32 */
33/**
34 * @file
35 * @brief IRQ notification framework.
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:
43 * - METHOD: method as registered by the SYS_IPC_REGISTER_IRQ syscall
44 * - ARG1: payload modified by a 'top-half' handler
45 * - ARG2: payload modified by a 'top-half' handler
46 * - ARG3: payload modified by a 'top-half' handler
47 * - in_phone_hash: interrupt counter (may be needed to assure correct order
48 * in multithreaded drivers)
49 */
50
51#include <arch.h>
52#include <mm/slab.h>
53#include <errno.h>
54#include <ddi/irq.h>
55#include <ipc/ipc.h>
56#include <ipc/irq.h>
57#include <syscall/copy.h>
58#include <console/console.h>
59#include <print.h>
60
61/** Execute code associated with IRQ notification.
62 *
63 * @param call Notification call.
64 * @param code Top-half pseudocode.
65 */
66static void code_execute(call_t *call, irq_code_t *code)
67{
68 unsigned int i;
69 unative_t dstval = 0;
70
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:
77 dstval = *((uint8_t *) code->cmds[i].addr);
78 break;
79 case CMD_MEM_READ_2:
80 dstval = *((uint16_t *) code->cmds[i].addr);
81 break;
82 case CMD_MEM_READ_4:
83 dstval = *((uint32_t *) code->cmds[i].addr);
84 break;
85 case CMD_MEM_READ_8:
86 dstval = *((uint64_t *) code->cmds[i].addr);
87 break;
88 case CMD_MEM_WRITE_1:
89 *((uint8_t *) code->cmds[i].addr) = code->cmds[i].value;
90 break;
91 case CMD_MEM_WRITE_2:
92 *((uint16_t *) code->cmds[i].addr) =
93 code->cmds[i].value;
94 break;
95 case CMD_MEM_WRITE_4:
96 *((uint32_t *) code->cmds[i].addr) =
97 code->cmds[i].value;
98 break;
99 case CMD_MEM_WRITE_8:
100 *((uint64_t *) code->cmds[i].addr) =
101 code->cmds[i].value;
102 break;
103#if defined(ia32) || defined(amd64)
104 case CMD_PORT_READ_1:
105 dstval = inb((long) code->cmds[i].addr);
106 break;
107 case CMD_PORT_WRITE_1:
108 outb((long) code->cmds[i].addr, code->cmds[i].value);
109 break;
110#endif
111#if defined(ia64) && defined(SKI)
112 case CMD_IA64_GETCHAR:
113 dstval = _getc(&ski_uconsole);
114 break;
115#endif
116#if defined(ppc32)
117 case CMD_PPC32_GETCHAR:
118 dstval = cuda_get_scancode();
119 break;
120#endif
121 default:
122 break;
123 }
124 if (code->cmds[i].dstarg && code->cmds[i].dstarg <
125 IPC_CALL_LEN) {
126 call->data.args[code->cmds[i].dstarg] = dstval;
127 }
128 }
129}
130
131/** Free top-half pseudocode.
132 *
133 * @param code Pointer to the top-half pseudocode.
134 */
135static void code_free(irq_code_t *code)
136{
137 if (code) {
138 free(code->cmds);
139 free(code);
140 }
141}
142
143/** Copy top-half pseudocode from userspace into the kernel.
144 *
145 * @param ucode Userspace address of the top-half pseudocode.
146 *
147 * @return Kernel address of the copied pseudocode.
148 */
149static irq_code_t *code_from_uspace(irq_code_t *ucode)
150{
151 irq_code_t *code;
152 irq_cmd_t *ucmds;
153 int rc;
154
155 code = malloc(sizeof(*code), 0);
156 rc = copy_from_uspace(code, ucode, sizeof(*code));
157 if (rc != 0) {
158 free(code);
159 return NULL;
160 }
161
162 if (code->cmdcount > IRQ_MAX_PROG_SIZE) {
163 free(code);
164 return NULL;
165 }
166 ucmds = code->cmds;
167 code->cmds = malloc(sizeof(code->cmds[0]) * code->cmdcount, 0);
168 rc = copy_from_uspace(code->cmds, ucmds,
169 sizeof(code->cmds[0]) * code->cmdcount);
170 if (rc != 0) {
171 free(code->cmds);
172 free(code);
173 return NULL;
174 }
175
176 return code;
177}
178
179/** Unregister task from IRQ notification.
180 *
181 * @param box Answerbox associated with the notification.
182 * @param inr IRQ number.
183 * @param devno Device number.
184 */
185void ipc_irq_unregister(answerbox_t *box, inr_t inr, devno_t devno)
186{
187 ipl_t ipl;
188 irq_t *irq;
189
190 ipl = interrupts_disable();
191 irq = irq_find_and_lock(inr, devno);
192 if (irq) {
193 if (irq->notif_cfg.answerbox == box) {
194 code_free(irq->notif_cfg.code);
195 irq->notif_cfg.notify = false;
196 irq->notif_cfg.answerbox = NULL;
197 irq->notif_cfg.code = NULL;
198 irq->notif_cfg.method = 0;
199 irq->notif_cfg.counter = 0;
200
201 spinlock_lock(&box->irq_lock);
202 list_remove(&irq->notif_cfg.link);
203 spinlock_unlock(&box->irq_lock);
204
205 spinlock_unlock(&irq->lock);
206 }
207 }
208 interrupts_restore(ipl);
209}
210
211/** Register an answerbox as a receiving end for IRQ notifications.
212 *
213 * @param box Receiving answerbox.
214 * @param inr IRQ number.
215 * @param devno Device number.
216 * @param method Method to be associated with the notification.
217 * @param ucode Uspace pointer to top-half pseudocode.
218 *
219 * @return EBADMEM, ENOENT or EEXISTS on failure or 0 on success.
220 */
221int ipc_irq_register(answerbox_t *box, inr_t inr, devno_t devno,
222 unative_t method, irq_code_t *ucode)
223{
224 ipl_t ipl;
225 irq_code_t *code;
226 irq_t *irq;
227
228 if (ucode) {
229 code = code_from_uspace(ucode);
230 if (!code)
231 return EBADMEM;
232 } else {
233 code = NULL;
234 }
235
236 ipl = interrupts_disable();
237 irq = irq_find_and_lock(inr, devno);
238 if (!irq) {
239 interrupts_restore(ipl);
240 code_free(code);
241 return ENOENT;
242 }
243
244 if (irq->notif_cfg.answerbox) {
245 spinlock_unlock(&irq->lock);
246 interrupts_restore(ipl);
247 code_free(code);
248 return EEXISTS;
249 }
250
251 irq->notif_cfg.notify = true;
252 irq->notif_cfg.answerbox = box;
253 irq->notif_cfg.method = method;
254 irq->notif_cfg.code = code;
255 irq->notif_cfg.counter = 0;
256
257 spinlock_lock(&box->irq_lock);
258 list_append(&irq->notif_cfg.link, &box->irq_head);
259 spinlock_unlock(&box->irq_lock);
260
261 spinlock_unlock(&irq->lock);
262 interrupts_restore(ipl);
263
264 return 0;
265}
266
267/** Add a call to the proper answerbox queue.
268 *
269 * Assume irq->lock is locked.
270 *
271 * @param irq IRQ structure referencing the target answerbox.
272 * @param call IRQ notification call.
273 */
274static void send_call(irq_t *irq, call_t *call)
275{
276 spinlock_lock(&irq->notif_cfg.answerbox->irq_lock);
277 list_append(&call->link, &irq->notif_cfg.answerbox->irq_notifs);
278 spinlock_unlock(&irq->notif_cfg.answerbox->irq_lock);
279
280 waitq_wakeup(&irq->notif_cfg.answerbox->wq, WAKEUP_FIRST);
281}
282
283/** Send notification message.
284 *
285 * @param irq IRQ structure.
286 * @param a1 Driver-specific payload argument.
287 * @param a2 Driver-specific payload argument.
288 * @param a3 Driver-specific payload argument.
289 * @param a4 Driver-specific payload argument.
290 * @param a5 Driver-specific payload argument.
291 */
292void ipc_irq_send_msg(irq_t *irq, unative_t a1, unative_t a2, unative_t a3,
293 unative_t a4, unative_t a5)
294{
295 call_t *call;
296
297 spinlock_lock(&irq->lock);
298
299 if (irq->notif_cfg.answerbox) {
300 call = ipc_call_alloc(FRAME_ATOMIC);
301 if (!call) {
302 spinlock_unlock(&irq->lock);
303 return;
304 }
305 call->flags |= IPC_CALL_NOTIF;
306 IPC_SET_METHOD(call->data, irq->notif_cfg.method);
307 IPC_SET_ARG1(call->data, a1);
308 IPC_SET_ARG2(call->data, a2);
309 IPC_SET_ARG3(call->data, a3);
310 IPC_SET_ARG4(call->data, a4);
311 IPC_SET_ARG5(call->data, a5);
312 /* Put a counter to the message */
313 call->priv = ++irq->notif_cfg.counter;
314
315 send_call(irq, call);
316 }
317 spinlock_unlock(&irq->lock);
318}
319
320/** Notify a task that an IRQ had occurred.
321 *
322 * We expect interrupts to be disabled and the irq->lock already held.
323 *
324 * @param irq IRQ structure.
325 */
326void ipc_irq_send_notif(irq_t *irq)
327{
328 call_t *call;
329
330 ASSERT(irq);
331
332 if (irq->notif_cfg.answerbox) {
333 call = ipc_call_alloc(FRAME_ATOMIC);
334 if (!call) {
335 return;
336 }
337 call->flags |= IPC_CALL_NOTIF;
338 /* Put a counter to the message */
339 call->priv = ++irq->notif_cfg.counter;
340 /* Set up args */
341 IPC_SET_METHOD(call->data, irq->notif_cfg.method);
342
343 /* Execute code to handle irq */
344 code_execute(call, irq->notif_cfg.code);
345
346 send_call(irq, call);
347 }
348}
349
350/** Disconnect all IRQ notifications from an answerbox.
351 *
352 * This function is effective because the answerbox contains
353 * list of all irq_t structures that are registered to
354 * send notifications to it.
355 *
356 * @param box Answerbox for which we want to carry out the cleanup.
357 */
358void ipc_irq_cleanup(answerbox_t *box)
359{
360 ipl_t ipl;
361
362loop:
363 ipl = interrupts_disable();
364 spinlock_lock(&box->irq_lock);
365
366 while (box->irq_head.next != &box->irq_head) {
367 link_t *cur = box->irq_head.next;
368 irq_t *irq;
369 DEADLOCK_PROBE_INIT(p_irqlock);
370
371 irq = list_get_instance(cur, irq_t, notif_cfg.link);
372 if (!spinlock_trylock(&irq->lock)) {
373 /*
374 * Avoid deadlock by trying again.
375 */
376 spinlock_unlock(&box->irq_lock);
377 interrupts_restore(ipl);
378 DEADLOCK_PROBE(p_irqlock, DEADLOCK_THRESHOLD);
379 goto loop;
380 }
381
382 ASSERT(irq->notif_cfg.answerbox == box);
383
384 list_remove(&irq->notif_cfg.link);
385
386 /*
387 * Don't forget to free any top-half pseudocode.
388 */
389 code_free(irq->notif_cfg.code);
390
391 irq->notif_cfg.notify = false;
392 irq->notif_cfg.answerbox = NULL;
393 irq->notif_cfg.code = NULL;
394 irq->notif_cfg.method = 0;
395 irq->notif_cfg.counter = 0;
396
397 spinlock_unlock(&irq->lock);
398 }
399
400 spinlock_unlock(&box->irq_lock);
401 interrupts_restore(ipl);
402}
403
404/** @}
405 */
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