blob: 7c41dabe7a2c3a3982d20fa89c4aa73882e3f0d0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
5 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include "linux/kernel.h"
9#include "linux/module.h"
10#include "linux/smp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include "linux/kernel_stat.h"
12#include "linux/interrupt.h"
13#include "linux/random.h"
14#include "linux/slab.h"
15#include "linux/file.h"
16#include "linux/proc_fs.h"
17#include "linux/init.h"
18#include "linux/seq_file.h"
19#include "linux/profile.h"
20#include "linux/hardirq.h"
21#include "asm/irq.h"
22#include "asm/hw_irq.h"
23#include "asm/atomic.h"
24#include "asm/signal.h"
25#include "asm/system.h"
26#include "asm/errno.h"
27#include "asm/uaccess.h"
28#include "user_util.h"
29#include "kern_util.h"
30#include "irq_user.h"
31#include "irq_kern.h"
Jeff Dike75e55842005-09-03 15:57:45 -070032#include "os.h"
Jeff Dike9b4f0182006-03-27 01:14:31 -080033#include "sigio.h"
34#include "misc_constants.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36/*
37 * Generic, controller-independent functions:
38 */
39
40int show_interrupts(struct seq_file *p, void *v)
41{
42 int i = *(loff_t *) v, j;
43 struct irqaction * action;
44 unsigned long flags;
45
46 if (i == 0) {
47 seq_printf(p, " ");
48 for_each_online_cpu(j)
49 seq_printf(p, "CPU%d ",j);
50 seq_putc(p, '\n');
51 }
52
53 if (i < NR_IRQS) {
54 spin_lock_irqsave(&irq_desc[i].lock, flags);
55 action = irq_desc[i].action;
56 if (!action)
57 goto skip;
58 seq_printf(p, "%3d: ",i);
59#ifndef CONFIG_SMP
60 seq_printf(p, "%10u ", kstat_irqs(i));
61#else
62 for_each_online_cpu(j)
63 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
64#endif
Ingo Molnard1bef4e2006-06-29 02:24:36 -070065 seq_printf(p, " %14s", irq_desc[i].chip->typename);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 seq_printf(p, " %s", action->name);
67
68 for (action=action->next; action; action = action->next)
69 seq_printf(p, ", %s", action->name);
70
71 seq_putc(p, '\n');
72skip:
73 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
74 } else if (i == NR_IRQS) {
75 seq_putc(p, '\n');
76 }
77
78 return 0;
79}
80
Jeff Dike9b4f0182006-03-27 01:14:31 -080081struct irq_fd *active_fds = NULL;
82static struct irq_fd **last_irq_ptr = &active_fds;
83
84extern void free_irqs(void);
85
86void sigio_handler(int sig, union uml_pt_regs *regs)
87{
88 struct irq_fd *irq_fd;
89 int n;
90
Jesper Juhl191ef962006-05-01 12:15:57 -070091 if (smp_sigio_handler())
92 return;
93
94 while (1) {
Jeff Dike9b4f0182006-03-27 01:14:31 -080095 n = os_waiting_for_events(active_fds);
96 if (n <= 0) {
97 if(n == -EINTR) continue;
98 else break;
99 }
100
Jesper Juhl191ef962006-05-01 12:15:57 -0700101 for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) {
102 if (irq_fd->current_events != 0) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800103 irq_fd->current_events = 0;
104 do_IRQ(irq_fd->irq, regs);
105 }
106 }
107 }
108
109 free_irqs();
110}
111
Jeff Dikebfaafd72006-07-10 04:45:10 -0700112static DEFINE_SPINLOCK(irq_lock);
113
Jeff Dike9b4f0182006-03-27 01:14:31 -0800114int activate_fd(int irq, int fd, int type, void *dev_id)
115{
116 struct pollfd *tmp_pfd;
117 struct irq_fd *new_fd, *irq_fd;
118 unsigned long flags;
119 int pid, events, err, n;
120
121 pid = os_getpid();
122 err = os_set_fd_async(fd, pid);
Jesper Juhl191ef962006-05-01 12:15:57 -0700123 if (err < 0)
Jeff Dike9b4f0182006-03-27 01:14:31 -0800124 goto out;
125
126 new_fd = um_kmalloc(sizeof(*new_fd));
127 err = -ENOMEM;
Jesper Juhl191ef962006-05-01 12:15:57 -0700128 if (new_fd == NULL)
Jeff Dike9b4f0182006-03-27 01:14:31 -0800129 goto out;
130
Jesper Juhl191ef962006-05-01 12:15:57 -0700131 if (type == IRQ_READ)
132 events = UM_POLLIN | UM_POLLPRI;
133 else
134 events = UM_POLLOUT;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800135 *new_fd = ((struct irq_fd) { .next = NULL,
136 .id = dev_id,
137 .fd = fd,
138 .type = type,
139 .irq = irq,
140 .pid = pid,
141 .events = events,
142 .current_events = 0 } );
143
Jeff Dikebfaafd72006-07-10 04:45:10 -0700144 spin_lock_irqsave(&irq_lock, flags);
Jesper Juhl191ef962006-05-01 12:15:57 -0700145 for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) {
146 if ((irq_fd->fd == fd) && (irq_fd->type == type)) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800147 printk("Registering fd %d twice\n", fd);
148 printk("Irqs : %d, %d\n", irq_fd->irq, irq);
149 printk("Ids : 0x%p, 0x%p\n", irq_fd->id, dev_id);
150 goto out_unlock;
151 }
152 }
153
Jesper Juhl191ef962006-05-01 12:15:57 -0700154 if (type == IRQ_WRITE)
Jeff Dike9b4f0182006-03-27 01:14:31 -0800155 fd = -1;
156
157 tmp_pfd = NULL;
158 n = 0;
159
Jesper Juhl191ef962006-05-01 12:15:57 -0700160 while (1) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800161 n = os_create_pollfd(fd, events, tmp_pfd, n);
162 if (n == 0)
163 break;
164
165 /* n > 0
166 * It means we couldn't put new pollfd to current pollfds
167 * and tmp_fds is NULL or too small for new pollfds array.
168 * Needed size is equal to n as minimum.
169 *
170 * Here we have to drop the lock in order to call
171 * kmalloc, which might sleep.
172 * If something else came in and changed the pollfds array
173 * so we will not be able to put new pollfd struct to pollfds
174 * then we free the buffer tmp_fds and try again.
175 */
Jeff Dikebfaafd72006-07-10 04:45:10 -0700176 spin_unlock_irqrestore(&irq_lock, flags);
Jesper Juhl191ef962006-05-01 12:15:57 -0700177 kfree(tmp_pfd);
178 tmp_pfd = NULL;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800179
180 tmp_pfd = um_kmalloc(n);
181 if (tmp_pfd == NULL)
182 goto out_kfree;
183
Jeff Dikebfaafd72006-07-10 04:45:10 -0700184 spin_lock_irqsave(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800185 }
Jeff Dike9b4f0182006-03-27 01:14:31 -0800186
187 *last_irq_ptr = new_fd;
188 last_irq_ptr = &new_fd->next;
189
Jeff Dikebfaafd72006-07-10 04:45:10 -0700190 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800191
192 /* This calls activate_fd, so it has to be outside the critical
193 * section.
194 */
Jeff Dike8e64d96a2006-07-10 04:45:11 -0700195 maybe_sigio_broken(fd, (type == IRQ_READ));
Jeff Dike9b4f0182006-03-27 01:14:31 -0800196
Jeff Dike19bdf042006-09-25 23:33:04 -0700197 return 0;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800198
199 out_unlock:
Jeff Dikebfaafd72006-07-10 04:45:10 -0700200 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800201 out_kfree:
202 kfree(new_fd);
203 out:
Jeff Dike19bdf042006-09-25 23:33:04 -0700204 return err;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800205}
206
207static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
208{
209 unsigned long flags;
210
Jeff Dikebfaafd72006-07-10 04:45:10 -0700211 spin_lock_irqsave(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800212 os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr);
Jeff Dikebfaafd72006-07-10 04:45:10 -0700213 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800214}
215
216struct irq_and_dev {
217 int irq;
218 void *dev;
219};
220
221static int same_irq_and_dev(struct irq_fd *irq, void *d)
222{
223 struct irq_and_dev *data = d;
224
Jesper Juhl191ef962006-05-01 12:15:57 -0700225 return ((irq->irq == data->irq) && (irq->id == data->dev));
Jeff Dike9b4f0182006-03-27 01:14:31 -0800226}
227
228void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
229{
230 struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
231 .dev = dev });
232
233 free_irq_by_cb(same_irq_and_dev, &data);
234}
235
236static int same_fd(struct irq_fd *irq, void *fd)
237{
Jesper Juhl191ef962006-05-01 12:15:57 -0700238 return (irq->fd == *((int *)fd));
Jeff Dike9b4f0182006-03-27 01:14:31 -0800239}
240
241void free_irq_by_fd(int fd)
242{
243 free_irq_by_cb(same_fd, &fd);
244}
245
246static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
247{
248 struct irq_fd *irq;
249 int i = 0;
250 int fdi;
251
Jesper Juhl191ef962006-05-01 12:15:57 -0700252 for (irq = active_fds; irq != NULL; irq = irq->next) {
253 if ((irq->fd == fd) && (irq->irq == irqnum))
254 break;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800255 i++;
256 }
Jesper Juhl191ef962006-05-01 12:15:57 -0700257 if (irq == NULL) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800258 printk("find_irq_by_fd doesn't have descriptor %d\n", fd);
259 goto out;
260 }
261 fdi = os_get_pollfd(i);
Jesper Juhl191ef962006-05-01 12:15:57 -0700262 if ((fdi != -1) && (fdi != fd)) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800263 printk("find_irq_by_fd - mismatch between active_fds and "
264 "pollfds, fd %d vs %d, need %d\n", irq->fd,
265 fdi, fd);
266 irq = NULL;
267 goto out;
268 }
269 *index_out = i;
270 out:
Jesper Juhl191ef962006-05-01 12:15:57 -0700271 return irq;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800272}
273
274void reactivate_fd(int fd, int irqnum)
275{
276 struct irq_fd *irq;
277 unsigned long flags;
278 int i;
279
Jeff Dikebfaafd72006-07-10 04:45:10 -0700280 spin_lock_irqsave(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800281 irq = find_irq_by_fd(fd, irqnum, &i);
Jesper Juhl191ef962006-05-01 12:15:57 -0700282 if (irq == NULL) {
Jeff Dikebfaafd72006-07-10 04:45:10 -0700283 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800284 return;
285 }
286 os_set_pollfd(i, irq->fd);
Jeff Dikebfaafd72006-07-10 04:45:10 -0700287 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800288
Jeff Dike19bdf042006-09-25 23:33:04 -0700289 add_sigio_fd(fd);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800290}
291
292void deactivate_fd(int fd, int irqnum)
293{
294 struct irq_fd *irq;
295 unsigned long flags;
296 int i;
297
Jeff Dikebfaafd72006-07-10 04:45:10 -0700298 spin_lock_irqsave(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800299 irq = find_irq_by_fd(fd, irqnum, &i);
Jeff Dike19bdf042006-09-25 23:33:04 -0700300 if(irq == NULL){
301 spin_unlock_irqrestore(&irq_lock, flags);
302 return;
303 }
304
Jeff Dike9b4f0182006-03-27 01:14:31 -0800305 os_set_pollfd(i, -1);
Jeff Dikebfaafd72006-07-10 04:45:10 -0700306 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike19bdf042006-09-25 23:33:04 -0700307
308 ignore_sigio_fd(fd);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800309}
310
311int deactivate_all_fds(void)
312{
313 struct irq_fd *irq;
314 int err;
315
Jesper Juhl191ef962006-05-01 12:15:57 -0700316 for (irq = active_fds; irq != NULL; irq = irq->next) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800317 err = os_clear_fd_async(irq->fd);
Jesper Juhl191ef962006-05-01 12:15:57 -0700318 if (err)
319 return err;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800320 }
321 /* If there is a signal already queued, after unblocking ignore it */
322 os_set_ioignore();
323
Jesper Juhl191ef962006-05-01 12:15:57 -0700324 return 0;
Jeff Dike9b4f0182006-03-27 01:14:31 -0800325}
326
Jeff Dike8ae43ff2006-07-10 04:45:09 -0700327#ifdef CONFIG_MODE_TT
Jeff Dike9b4f0182006-03-27 01:14:31 -0800328void forward_interrupts(int pid)
329{
330 struct irq_fd *irq;
331 unsigned long flags;
332 int err;
333
Jeff Dikebfaafd72006-07-10 04:45:10 -0700334 spin_lock_irqsave(&irq_lock, flags);
Jesper Juhl191ef962006-05-01 12:15:57 -0700335 for (irq = active_fds; irq != NULL; irq = irq->next) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800336 err = os_set_owner(irq->fd, pid);
Jesper Juhl191ef962006-05-01 12:15:57 -0700337 if (err < 0) {
Jeff Dike9b4f0182006-03-27 01:14:31 -0800338 /* XXX Just remove the irq rather than
339 * print out an infinite stream of these
340 */
341 printk("Failed to forward %d to pid %d, err = %d\n",
342 irq->fd, pid, -err);
343 }
344
345 irq->pid = pid;
346 }
Jeff Dikebfaafd72006-07-10 04:45:10 -0700347 spin_unlock_irqrestore(&irq_lock, flags);
Jeff Dike9b4f0182006-03-27 01:14:31 -0800348}
Jeff Dike8ae43ff2006-07-10 04:45:09 -0700349#endif
Jeff Dike9b4f0182006-03-27 01:14:31 -0800350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351/*
352 * do_IRQ handles all normal device IRQ's (the special
353 * SMP cross-CPU interrupts have their own specific
354 * handlers).
355 */
356unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
357{
358 irq_enter();
Pekka Enberg96e1a872006-10-06 00:44:06 -0700359 __do_IRQ(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 irq_exit();
361 return 1;
362}
363
364int um_request_irq(unsigned int irq, int fd, int type,
365 irqreturn_t (*handler)(int, void *, struct pt_regs *),
366 unsigned long irqflags, const char * devname,
367 void *dev_id)
368{
369 int err;
370
371 err = request_irq(irq, handler, irqflags, devname, dev_id);
Jesper Juhl191ef962006-05-01 12:15:57 -0700372 if (err)
373 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Jesper Juhl191ef962006-05-01 12:15:57 -0700375 if (fd != -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 err = activate_fd(irq, fd, type, dev_id);
Jesper Juhl191ef962006-05-01 12:15:57 -0700377 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379EXPORT_SYMBOL(um_request_irq);
380EXPORT_SYMBOL(reactivate_fd);
381
Paolo 'Blaisorblade' Giarrussodbce7062005-06-21 17:16:19 -0700382/* hw_interrupt_type must define (startup || enable) &&
383 * (shutdown || disable) && end */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384static void dummy(unsigned int irq)
385{
386}
387
Paolo 'Blaisorblade' Giarrussodbce7062005-06-21 17:16:19 -0700388/* This is used for everything else than the timer. */
389static struct hw_interrupt_type normal_irq_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 .typename = "SIGIO",
Paolo 'Blaisorblade' Giarrussodbce7062005-06-21 17:16:19 -0700391 .release = free_irq_by_irq_and_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 .disable = dummy,
393 .enable = dummy,
394 .ack = dummy,
395 .end = dummy
396};
397
398static struct hw_interrupt_type SIGVTALRM_irq_type = {
399 .typename = "SIGVTALRM",
Paolo 'Blaisorblade' Giarrussodbce7062005-06-21 17:16:19 -0700400 .release = free_irq_by_irq_and_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 .shutdown = dummy, /* never called */
402 .disable = dummy,
403 .enable = dummy,
404 .ack = dummy,
405 .end = dummy
406};
407
408void __init init_IRQ(void)
409{
410 int i;
411
412 irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
413 irq_desc[TIMER_IRQ].action = NULL;
414 irq_desc[TIMER_IRQ].depth = 1;
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700415 irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 enable_irq(TIMER_IRQ);
Jesper Juhl191ef962006-05-01 12:15:57 -0700417 for (i = 1; i < NR_IRQS; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 irq_desc[i].status = IRQ_DISABLED;
419 irq_desc[i].action = NULL;
420 irq_desc[i].depth = 1;
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700421 irq_desc[i].chip = &normal_irq_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 enable_irq(i);
423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
Jeff Dike75e55842005-09-03 15:57:45 -0700426int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *,
427 struct pt_regs *))
428{
429 int fds[2], err;
430
431 err = os_pipe(fds, 1, 1);
Jesper Juhl191ef962006-05-01 12:15:57 -0700432 if (err) {
Jeff Dike75e55842005-09-03 15:57:45 -0700433 printk("init_aio_irq - os_pipe failed, err = %d\n", -err);
434 goto out;
435 }
436
437 err = um_request_irq(irq, fds[0], IRQ_READ, handler,
Thomas Gleixnerbd6aa652006-07-01 19:29:27 -0700438 IRQF_DISABLED | IRQF_SAMPLE_RANDOM, name,
Jeff Dike75e55842005-09-03 15:57:45 -0700439 (void *) (long) fds[0]);
Jesper Juhl191ef962006-05-01 12:15:57 -0700440 if (err) {
Jeff Dike75e55842005-09-03 15:57:45 -0700441 printk("init_aio_irq - : um_request_irq failed, err = %d\n",
442 err);
443 goto out_close;
444 }
445
446 err = fds[1];
447 goto out;
448
449 out_close:
450 os_close_file(fds[0]);
451 os_close_file(fds[1]);
452 out:
Jesper Juhl191ef962006-05-01 12:15:57 -0700453 return err;
Jeff Dike75e55842005-09-03 15:57:45 -0700454}