Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | ||
8 | #include "linux/config.h" | |
9 | #include "linux/kernel.h" | |
10 | #include "linux/module.h" | |
11 | #include "linux/smp.h" | |
1da177e4 LT |
12 | #include "linux/kernel_stat.h" |
13 | #include "linux/interrupt.h" | |
14 | #include "linux/random.h" | |
15 | #include "linux/slab.h" | |
16 | #include "linux/file.h" | |
17 | #include "linux/proc_fs.h" | |
18 | #include "linux/init.h" | |
19 | #include "linux/seq_file.h" | |
20 | #include "linux/profile.h" | |
21 | #include "linux/hardirq.h" | |
22 | #include "asm/irq.h" | |
23 | #include "asm/hw_irq.h" | |
24 | #include "asm/atomic.h" | |
25 | #include "asm/signal.h" | |
26 | #include "asm/system.h" | |
27 | #include "asm/errno.h" | |
28 | #include "asm/uaccess.h" | |
29 | #include "user_util.h" | |
30 | #include "kern_util.h" | |
31 | #include "irq_user.h" | |
32 | #include "irq_kern.h" | |
75e5584c | 33 | #include "os.h" |
9b4f018d JD |
34 | #include "sigio.h" |
35 | #include "misc_constants.h" | |
1da177e4 LT |
36 | |
37 | /* | |
38 | * Generic, controller-independent functions: | |
39 | */ | |
40 | ||
41 | int show_interrupts(struct seq_file *p, void *v) | |
42 | { | |
43 | int i = *(loff_t *) v, j; | |
44 | struct irqaction * action; | |
45 | unsigned long flags; | |
46 | ||
47 | if (i == 0) { | |
48 | seq_printf(p, " "); | |
49 | for_each_online_cpu(j) | |
50 | seq_printf(p, "CPU%d ",j); | |
51 | seq_putc(p, '\n'); | |
52 | } | |
53 | ||
54 | if (i < NR_IRQS) { | |
55 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
56 | action = irq_desc[i].action; | |
57 | if (!action) | |
58 | goto skip; | |
59 | seq_printf(p, "%3d: ",i); | |
60 | #ifndef CONFIG_SMP | |
61 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
62 | #else | |
63 | for_each_online_cpu(j) | |
64 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
65 | #endif | |
66 | seq_printf(p, " %14s", irq_desc[i].handler->typename); | |
67 | seq_printf(p, " %s", action->name); | |
68 | ||
69 | for (action=action->next; action; action = action->next) | |
70 | seq_printf(p, ", %s", action->name); | |
71 | ||
72 | seq_putc(p, '\n'); | |
73 | skip: | |
74 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
75 | } else if (i == NR_IRQS) { | |
76 | seq_putc(p, '\n'); | |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
9b4f018d JD |
82 | struct irq_fd *active_fds = NULL; |
83 | static struct irq_fd **last_irq_ptr = &active_fds; | |
84 | ||
85 | extern void free_irqs(void); | |
86 | ||
87 | void sigio_handler(int sig, union uml_pt_regs *regs) | |
88 | { | |
89 | struct irq_fd *irq_fd; | |
90 | int n; | |
91 | ||
92 | if(smp_sigio_handler()) return; | |
93 | while(1){ | |
94 | n = os_waiting_for_events(active_fds); | |
95 | if (n <= 0) { | |
96 | if(n == -EINTR) continue; | |
97 | else break; | |
98 | } | |
99 | ||
100 | for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){ | |
101 | if(irq_fd->current_events != 0){ | |
102 | irq_fd->current_events = 0; | |
103 | do_IRQ(irq_fd->irq, regs); | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | free_irqs(); | |
109 | } | |
110 | ||
111 | static void maybe_sigio_broken(int fd, int type) | |
112 | { | |
113 | if(os_isatty(fd)){ | |
114 | if((type == IRQ_WRITE) && !pty_output_sigio){ | |
115 | write_sigio_workaround(); | |
116 | add_sigio_fd(fd, 0); | |
117 | } | |
118 | else if((type == IRQ_READ) && !pty_close_sigio){ | |
119 | write_sigio_workaround(); | |
120 | add_sigio_fd(fd, 1); | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | ||
126 | int activate_fd(int irq, int fd, int type, void *dev_id) | |
127 | { | |
128 | struct pollfd *tmp_pfd; | |
129 | struct irq_fd *new_fd, *irq_fd; | |
130 | unsigned long flags; | |
131 | int pid, events, err, n; | |
132 | ||
133 | pid = os_getpid(); | |
134 | err = os_set_fd_async(fd, pid); | |
135 | if(err < 0) | |
136 | goto out; | |
137 | ||
138 | new_fd = um_kmalloc(sizeof(*new_fd)); | |
139 | err = -ENOMEM; | |
140 | if(new_fd == NULL) | |
141 | goto out; | |
142 | ||
143 | if(type == IRQ_READ) events = UM_POLLIN | UM_POLLPRI; | |
144 | else events = UM_POLLOUT; | |
145 | *new_fd = ((struct irq_fd) { .next = NULL, | |
146 | .id = dev_id, | |
147 | .fd = fd, | |
148 | .type = type, | |
149 | .irq = irq, | |
150 | .pid = pid, | |
151 | .events = events, | |
152 | .current_events = 0 } ); | |
153 | ||
154 | /* Critical section - locked by a spinlock because this stuff can | |
155 | * be changed from interrupt handlers. The stuff above is done | |
156 | * outside the lock because it allocates memory. | |
157 | */ | |
158 | ||
159 | /* Actually, it only looks like it can be called from interrupt | |
160 | * context. The culprit is reactivate_fd, which calls | |
161 | * maybe_sigio_broken, which calls write_sigio_workaround, | |
162 | * which calls activate_fd. However, write_sigio_workaround should | |
163 | * only be called once, at boot time. That would make it clear that | |
164 | * this is called only from process context, and can be locked with | |
165 | * a semaphore. | |
166 | */ | |
167 | flags = irq_lock(); | |
168 | for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){ | |
169 | if((irq_fd->fd == fd) && (irq_fd->type == type)){ | |
170 | printk("Registering fd %d twice\n", fd); | |
171 | printk("Irqs : %d, %d\n", irq_fd->irq, irq); | |
172 | printk("Ids : 0x%p, 0x%p\n", irq_fd->id, dev_id); | |
173 | goto out_unlock; | |
174 | } | |
175 | } | |
176 | ||
177 | /*-------------*/ | |
178 | if(type == IRQ_WRITE) | |
179 | fd = -1; | |
180 | ||
181 | tmp_pfd = NULL; | |
182 | n = 0; | |
183 | ||
184 | while(1){ | |
185 | n = os_create_pollfd(fd, events, tmp_pfd, n); | |
186 | if (n == 0) | |
187 | break; | |
188 | ||
189 | /* n > 0 | |
190 | * It means we couldn't put new pollfd to current pollfds | |
191 | * and tmp_fds is NULL or too small for new pollfds array. | |
192 | * Needed size is equal to n as minimum. | |
193 | * | |
194 | * Here we have to drop the lock in order to call | |
195 | * kmalloc, which might sleep. | |
196 | * If something else came in and changed the pollfds array | |
197 | * so we will not be able to put new pollfd struct to pollfds | |
198 | * then we free the buffer tmp_fds and try again. | |
199 | */ | |
200 | irq_unlock(flags); | |
201 | if (tmp_pfd != NULL) { | |
202 | kfree(tmp_pfd); | |
203 | tmp_pfd = NULL; | |
204 | } | |
205 | ||
206 | tmp_pfd = um_kmalloc(n); | |
207 | if (tmp_pfd == NULL) | |
208 | goto out_kfree; | |
209 | ||
210 | flags = irq_lock(); | |
211 | } | |
212 | /*-------------*/ | |
213 | ||
214 | *last_irq_ptr = new_fd; | |
215 | last_irq_ptr = &new_fd->next; | |
216 | ||
217 | irq_unlock(flags); | |
218 | ||
219 | /* This calls activate_fd, so it has to be outside the critical | |
220 | * section. | |
221 | */ | |
222 | maybe_sigio_broken(fd, type); | |
223 | ||
224 | return(0); | |
225 | ||
226 | out_unlock: | |
227 | irq_unlock(flags); | |
228 | out_kfree: | |
229 | kfree(new_fd); | |
230 | out: | |
231 | return(err); | |
232 | } | |
233 | ||
234 | static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg) | |
235 | { | |
236 | unsigned long flags; | |
237 | ||
238 | flags = irq_lock(); | |
239 | os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr); | |
240 | irq_unlock(flags); | |
241 | } | |
242 | ||
243 | struct irq_and_dev { | |
244 | int irq; | |
245 | void *dev; | |
246 | }; | |
247 | ||
248 | static int same_irq_and_dev(struct irq_fd *irq, void *d) | |
249 | { | |
250 | struct irq_and_dev *data = d; | |
251 | ||
252 | return((irq->irq == data->irq) && (irq->id == data->dev)); | |
253 | } | |
254 | ||
255 | void free_irq_by_irq_and_dev(unsigned int irq, void *dev) | |
256 | { | |
257 | struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq, | |
258 | .dev = dev }); | |
259 | ||
260 | free_irq_by_cb(same_irq_and_dev, &data); | |
261 | } | |
262 | ||
263 | static int same_fd(struct irq_fd *irq, void *fd) | |
264 | { | |
265 | return(irq->fd == *((int *) fd)); | |
266 | } | |
267 | ||
268 | void free_irq_by_fd(int fd) | |
269 | { | |
270 | free_irq_by_cb(same_fd, &fd); | |
271 | } | |
272 | ||
273 | static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out) | |
274 | { | |
275 | struct irq_fd *irq; | |
276 | int i = 0; | |
277 | int fdi; | |
278 | ||
279 | for(irq=active_fds; irq != NULL; irq = irq->next){ | |
280 | if((irq->fd == fd) && (irq->irq == irqnum)) break; | |
281 | i++; | |
282 | } | |
283 | if(irq == NULL){ | |
284 | printk("find_irq_by_fd doesn't have descriptor %d\n", fd); | |
285 | goto out; | |
286 | } | |
287 | fdi = os_get_pollfd(i); | |
288 | if((fdi != -1) && (fdi != fd)){ | |
289 | printk("find_irq_by_fd - mismatch between active_fds and " | |
290 | "pollfds, fd %d vs %d, need %d\n", irq->fd, | |
291 | fdi, fd); | |
292 | irq = NULL; | |
293 | goto out; | |
294 | } | |
295 | *index_out = i; | |
296 | out: | |
297 | return(irq); | |
298 | } | |
299 | ||
300 | void reactivate_fd(int fd, int irqnum) | |
301 | { | |
302 | struct irq_fd *irq; | |
303 | unsigned long flags; | |
304 | int i; | |
305 | ||
306 | flags = irq_lock(); | |
307 | irq = find_irq_by_fd(fd, irqnum, &i); | |
308 | if(irq == NULL){ | |
309 | irq_unlock(flags); | |
310 | return; | |
311 | } | |
312 | os_set_pollfd(i, irq->fd); | |
313 | irq_unlock(flags); | |
314 | ||
315 | /* This calls activate_fd, so it has to be outside the critical | |
316 | * section. | |
317 | */ | |
318 | maybe_sigio_broken(fd, irq->type); | |
319 | } | |
320 | ||
321 | void deactivate_fd(int fd, int irqnum) | |
322 | { | |
323 | struct irq_fd *irq; | |
324 | unsigned long flags; | |
325 | int i; | |
326 | ||
327 | flags = irq_lock(); | |
328 | irq = find_irq_by_fd(fd, irqnum, &i); | |
329 | if(irq == NULL) | |
330 | goto out; | |
331 | os_set_pollfd(i, -1); | |
332 | out: | |
333 | irq_unlock(flags); | |
334 | } | |
335 | ||
336 | int deactivate_all_fds(void) | |
337 | { | |
338 | struct irq_fd *irq; | |
339 | int err; | |
340 | ||
341 | for(irq=active_fds;irq != NULL;irq = irq->next){ | |
342 | err = os_clear_fd_async(irq->fd); | |
343 | if(err) | |
344 | return(err); | |
345 | } | |
346 | /* If there is a signal already queued, after unblocking ignore it */ | |
347 | os_set_ioignore(); | |
348 | ||
349 | return(0); | |
350 | } | |
351 | ||
352 | void forward_interrupts(int pid) | |
353 | { | |
354 | struct irq_fd *irq; | |
355 | unsigned long flags; | |
356 | int err; | |
357 | ||
358 | flags = irq_lock(); | |
359 | for(irq=active_fds;irq != NULL;irq = irq->next){ | |
360 | err = os_set_owner(irq->fd, pid); | |
361 | if(err < 0){ | |
362 | /* XXX Just remove the irq rather than | |
363 | * print out an infinite stream of these | |
364 | */ | |
365 | printk("Failed to forward %d to pid %d, err = %d\n", | |
366 | irq->fd, pid, -err); | |
367 | } | |
368 | ||
369 | irq->pid = pid; | |
370 | } | |
371 | irq_unlock(flags); | |
372 | } | |
373 | ||
1da177e4 LT |
374 | /* |
375 | * do_IRQ handles all normal device IRQ's (the special | |
376 | * SMP cross-CPU interrupts have their own specific | |
377 | * handlers). | |
378 | */ | |
379 | unsigned int do_IRQ(int irq, union uml_pt_regs *regs) | |
380 | { | |
381 | irq_enter(); | |
382 | __do_IRQ(irq, (struct pt_regs *) regs); | |
383 | irq_exit(); | |
384 | return 1; | |
385 | } | |
386 | ||
387 | int um_request_irq(unsigned int irq, int fd, int type, | |
388 | irqreturn_t (*handler)(int, void *, struct pt_regs *), | |
389 | unsigned long irqflags, const char * devname, | |
390 | void *dev_id) | |
391 | { | |
392 | int err; | |
393 | ||
394 | err = request_irq(irq, handler, irqflags, devname, dev_id); | |
395 | if(err) | |
396 | return(err); | |
397 | ||
398 | if(fd != -1) | |
399 | err = activate_fd(irq, fd, type, dev_id); | |
400 | return(err); | |
401 | } | |
402 | EXPORT_SYMBOL(um_request_irq); | |
403 | EXPORT_SYMBOL(reactivate_fd); | |
404 | ||
405 | static DEFINE_SPINLOCK(irq_spinlock); | |
406 | ||
407 | unsigned long irq_lock(void) | |
408 | { | |
409 | unsigned long flags; | |
410 | ||
411 | spin_lock_irqsave(&irq_spinlock, flags); | |
412 | return(flags); | |
413 | } | |
414 | ||
415 | void irq_unlock(unsigned long flags) | |
416 | { | |
417 | spin_unlock_irqrestore(&irq_spinlock, flags); | |
418 | } | |
419 | ||
dbce706e PBG |
420 | /* hw_interrupt_type must define (startup || enable) && |
421 | * (shutdown || disable) && end */ | |
1da177e4 LT |
422 | static void dummy(unsigned int irq) |
423 | { | |
424 | } | |
425 | ||
dbce706e PBG |
426 | /* This is used for everything else than the timer. */ |
427 | static struct hw_interrupt_type normal_irq_type = { | |
1da177e4 | 428 | .typename = "SIGIO", |
dbce706e | 429 | .release = free_irq_by_irq_and_dev, |
1da177e4 LT |
430 | .disable = dummy, |
431 | .enable = dummy, | |
432 | .ack = dummy, | |
433 | .end = dummy | |
434 | }; | |
435 | ||
436 | static struct hw_interrupt_type SIGVTALRM_irq_type = { | |
437 | .typename = "SIGVTALRM", | |
dbce706e | 438 | .release = free_irq_by_irq_and_dev, |
1da177e4 LT |
439 | .shutdown = dummy, /* never called */ |
440 | .disable = dummy, | |
441 | .enable = dummy, | |
442 | .ack = dummy, | |
443 | .end = dummy | |
444 | }; | |
445 | ||
446 | void __init init_IRQ(void) | |
447 | { | |
448 | int i; | |
449 | ||
450 | irq_desc[TIMER_IRQ].status = IRQ_DISABLED; | |
451 | irq_desc[TIMER_IRQ].action = NULL; | |
452 | irq_desc[TIMER_IRQ].depth = 1; | |
453 | irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type; | |
454 | enable_irq(TIMER_IRQ); | |
455 | for(i=1;i<NR_IRQS;i++){ | |
456 | irq_desc[i].status = IRQ_DISABLED; | |
457 | irq_desc[i].action = NULL; | |
458 | irq_desc[i].depth = 1; | |
dbce706e | 459 | irq_desc[i].handler = &normal_irq_type; |
1da177e4 LT |
460 | enable_irq(i); |
461 | } | |
1da177e4 LT |
462 | } |
463 | ||
75e5584c JD |
464 | int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *, |
465 | struct pt_regs *)) | |
466 | { | |
467 | int fds[2], err; | |
468 | ||
469 | err = os_pipe(fds, 1, 1); | |
470 | if(err){ | |
471 | printk("init_aio_irq - os_pipe failed, err = %d\n", -err); | |
472 | goto out; | |
473 | } | |
474 | ||
475 | err = um_request_irq(irq, fds[0], IRQ_READ, handler, | |
476 | SA_INTERRUPT | SA_SAMPLE_RANDOM, name, | |
477 | (void *) (long) fds[0]); | |
478 | if(err){ | |
479 | printk("init_aio_irq - : um_request_irq failed, err = %d\n", | |
480 | err); | |
481 | goto out_close; | |
482 | } | |
483 | ||
484 | err = fds[1]; | |
485 | goto out; | |
486 | ||
487 | out_close: | |
488 | os_close_file(fds[0]); | |
489 | os_close_file(fds[1]); | |
490 | out: | |
491 | return(err); | |
492 | } |