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1 | /* | |
2 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <linux/irqreturn.h> | |
7 | #include <linux/kd.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/slab.h> | |
10 | #include "chan.h" | |
11 | #include <irq_kern.h> | |
12 | #include <irq_user.h> | |
13 | #include <kern_util.h> | |
14 | #include <os.h> | |
15 | ||
16 | #define LINE_BUFSIZE 4096 | |
17 | ||
18 | static irqreturn_t line_interrupt(int irq, void *data) | |
19 | { | |
20 | struct chan *chan = data; | |
21 | struct line *line = chan->line; | |
22 | ||
23 | if (line) | |
24 | chan_interrupt(line, irq); | |
25 | ||
26 | return IRQ_HANDLED; | |
27 | } | |
28 | ||
29 | /* | |
30 | * Returns the free space inside the ring buffer of this line. | |
31 | * | |
32 | * Should be called while holding line->lock (this does not modify data). | |
33 | */ | |
34 | static int write_room(struct line *line) | |
35 | { | |
36 | int n; | |
37 | ||
38 | if (line->buffer == NULL) | |
39 | return LINE_BUFSIZE - 1; | |
40 | ||
41 | /* This is for the case where the buffer is wrapped! */ | |
42 | n = line->head - line->tail; | |
43 | ||
44 | if (n <= 0) | |
45 | n += LINE_BUFSIZE; /* The other case */ | |
46 | return n - 1; | |
47 | } | |
48 | ||
49 | int line_write_room(struct tty_struct *tty) | |
50 | { | |
51 | struct line *line = tty->driver_data; | |
52 | unsigned long flags; | |
53 | int room; | |
54 | ||
55 | spin_lock_irqsave(&line->lock, flags); | |
56 | room = write_room(line); | |
57 | spin_unlock_irqrestore(&line->lock, flags); | |
58 | ||
59 | return room; | |
60 | } | |
61 | ||
62 | int line_chars_in_buffer(struct tty_struct *tty) | |
63 | { | |
64 | struct line *line = tty->driver_data; | |
65 | unsigned long flags; | |
66 | int ret; | |
67 | ||
68 | spin_lock_irqsave(&line->lock, flags); | |
69 | /* write_room subtracts 1 for the needed NULL, so we readd it.*/ | |
70 | ret = LINE_BUFSIZE - (write_room(line) + 1); | |
71 | spin_unlock_irqrestore(&line->lock, flags); | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | /* | |
77 | * This copies the content of buf into the circular buffer associated with | |
78 | * this line. | |
79 | * The return value is the number of characters actually copied, i.e. the ones | |
80 | * for which there was space: this function is not supposed to ever flush out | |
81 | * the circular buffer. | |
82 | * | |
83 | * Must be called while holding line->lock! | |
84 | */ | |
85 | static int buffer_data(struct line *line, const char *buf, int len) | |
86 | { | |
87 | int end, room; | |
88 | ||
89 | if (line->buffer == NULL) { | |
90 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); | |
91 | if (line->buffer == NULL) { | |
92 | printk(KERN_ERR "buffer_data - atomic allocation " | |
93 | "failed\n"); | |
94 | return 0; | |
95 | } | |
96 | line->head = line->buffer; | |
97 | line->tail = line->buffer; | |
98 | } | |
99 | ||
100 | room = write_room(line); | |
101 | len = (len > room) ? room : len; | |
102 | ||
103 | end = line->buffer + LINE_BUFSIZE - line->tail; | |
104 | ||
105 | if (len < end) { | |
106 | memcpy(line->tail, buf, len); | |
107 | line->tail += len; | |
108 | } | |
109 | else { | |
110 | /* The circular buffer is wrapping */ | |
111 | memcpy(line->tail, buf, end); | |
112 | buf += end; | |
113 | memcpy(line->buffer, buf, len - end); | |
114 | line->tail = line->buffer + len - end; | |
115 | } | |
116 | ||
117 | return len; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Flushes the ring buffer to the output channels. That is, write_chan is | |
122 | * called, passing it line->head as buffer, and an appropriate count. | |
123 | * | |
124 | * On exit, returns 1 when the buffer is empty, | |
125 | * 0 when the buffer is not empty on exit, | |
126 | * and -errno when an error occurred. | |
127 | * | |
128 | * Must be called while holding line->lock!*/ | |
129 | static int flush_buffer(struct line *line) | |
130 | { | |
131 | int n, count; | |
132 | ||
133 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
134 | return 1; | |
135 | ||
136 | if (line->tail < line->head) { | |
137 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ | |
138 | count = line->buffer + LINE_BUFSIZE - line->head; | |
139 | ||
140 | n = write_chan(line->chan_out, line->head, count, | |
141 | line->driver->write_irq); | |
142 | if (n < 0) | |
143 | return n; | |
144 | if (n == count) { | |
145 | /* | |
146 | * We have flushed from ->head to buffer end, now we | |
147 | * must flush only from the beginning to ->tail. | |
148 | */ | |
149 | line->head = line->buffer; | |
150 | } else { | |
151 | line->head += n; | |
152 | return 0; | |
153 | } | |
154 | } | |
155 | ||
156 | count = line->tail - line->head; | |
157 | n = write_chan(line->chan_out, line->head, count, | |
158 | line->driver->write_irq); | |
159 | ||
160 | if (n < 0) | |
161 | return n; | |
162 | ||
163 | line->head += n; | |
164 | return line->head == line->tail; | |
165 | } | |
166 | ||
167 | void line_flush_buffer(struct tty_struct *tty) | |
168 | { | |
169 | struct line *line = tty->driver_data; | |
170 | unsigned long flags; | |
171 | ||
172 | spin_lock_irqsave(&line->lock, flags); | |
173 | flush_buffer(line); | |
174 | spin_unlock_irqrestore(&line->lock, flags); | |
175 | } | |
176 | ||
177 | /* | |
178 | * We map both ->flush_chars and ->put_char (which go in pair) onto | |
179 | * ->flush_buffer and ->write. Hope it's not that bad. | |
180 | */ | |
181 | void line_flush_chars(struct tty_struct *tty) | |
182 | { | |
183 | line_flush_buffer(tty); | |
184 | } | |
185 | ||
186 | int line_put_char(struct tty_struct *tty, unsigned char ch) | |
187 | { | |
188 | return line_write(tty, &ch, sizeof(ch)); | |
189 | } | |
190 | ||
191 | int line_write(struct tty_struct *tty, const unsigned char *buf, int len) | |
192 | { | |
193 | struct line *line = tty->driver_data; | |
194 | unsigned long flags; | |
195 | int n, ret = 0; | |
196 | ||
197 | spin_lock_irqsave(&line->lock, flags); | |
198 | if (line->head != line->tail) | |
199 | ret = buffer_data(line, buf, len); | |
200 | else { | |
201 | n = write_chan(line->chan_out, buf, len, | |
202 | line->driver->write_irq); | |
203 | if (n < 0) { | |
204 | ret = n; | |
205 | goto out_up; | |
206 | } | |
207 | ||
208 | len -= n; | |
209 | ret += n; | |
210 | if (len > 0) | |
211 | ret += buffer_data(line, buf + n, len); | |
212 | } | |
213 | out_up: | |
214 | spin_unlock_irqrestore(&line->lock, flags); | |
215 | return ret; | |
216 | } | |
217 | ||
218 | void line_set_termios(struct tty_struct *tty, struct ktermios * old) | |
219 | { | |
220 | /* nothing */ | |
221 | } | |
222 | ||
223 | void line_throttle(struct tty_struct *tty) | |
224 | { | |
225 | struct line *line = tty->driver_data; | |
226 | ||
227 | deactivate_chan(line->chan_in, line->driver->read_irq); | |
228 | line->throttled = 1; | |
229 | } | |
230 | ||
231 | void line_unthrottle(struct tty_struct *tty) | |
232 | { | |
233 | struct line *line = tty->driver_data; | |
234 | ||
235 | line->throttled = 0; | |
236 | chan_interrupt(line, line->driver->read_irq); | |
237 | ||
238 | /* | |
239 | * Maybe there is enough stuff pending that calling the interrupt | |
240 | * throttles us again. In this case, line->throttled will be 1 | |
241 | * again and we shouldn't turn the interrupt back on. | |
242 | */ | |
243 | if (!line->throttled) | |
244 | reactivate_chan(line->chan_in, line->driver->read_irq); | |
245 | } | |
246 | ||
247 | static irqreturn_t line_write_interrupt(int irq, void *data) | |
248 | { | |
249 | struct chan *chan = data; | |
250 | struct line *line = chan->line; | |
251 | int err; | |
252 | ||
253 | /* | |
254 | * Interrupts are disabled here because genirq keep irqs disabled when | |
255 | * calling the action handler. | |
256 | */ | |
257 | ||
258 | spin_lock(&line->lock); | |
259 | err = flush_buffer(line); | |
260 | if (err == 0) { | |
261 | spin_unlock(&line->lock); | |
262 | return IRQ_NONE; | |
263 | } else if (err < 0) { | |
264 | line->head = line->buffer; | |
265 | line->tail = line->buffer; | |
266 | } | |
267 | spin_unlock(&line->lock); | |
268 | ||
269 | tty_port_tty_wakeup(&line->port); | |
270 | ||
271 | return IRQ_HANDLED; | |
272 | } | |
273 | ||
274 | int line_setup_irq(int fd, int input, int output, struct line *line, void *data) | |
275 | { | |
276 | const struct line_driver *driver = line->driver; | |
277 | int err = 0; | |
278 | ||
279 | if (input) | |
280 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
281 | line_interrupt, IRQF_SHARED, | |
282 | driver->read_irq_name, data); | |
283 | if (err) | |
284 | return err; | |
285 | if (output) | |
286 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
287 | line_write_interrupt, IRQF_SHARED, | |
288 | driver->write_irq_name, data); | |
289 | return err; | |
290 | } | |
291 | ||
292 | static int line_activate(struct tty_port *port, struct tty_struct *tty) | |
293 | { | |
294 | int ret; | |
295 | struct line *line = tty->driver_data; | |
296 | ||
297 | ret = enable_chan(line); | |
298 | if (ret) | |
299 | return ret; | |
300 | ||
301 | if (!line->sigio) { | |
302 | chan_enable_winch(line->chan_out, port); | |
303 | line->sigio = 1; | |
304 | } | |
305 | ||
306 | chan_window_size(line, &tty->winsize.ws_row, | |
307 | &tty->winsize.ws_col); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static void unregister_winch(struct tty_struct *tty); | |
313 | ||
314 | static void line_destruct(struct tty_port *port) | |
315 | { | |
316 | struct tty_struct *tty = tty_port_tty_get(port); | |
317 | struct line *line = tty->driver_data; | |
318 | ||
319 | if (line->sigio) { | |
320 | unregister_winch(tty); | |
321 | line->sigio = 0; | |
322 | } | |
323 | } | |
324 | ||
325 | static const struct tty_port_operations line_port_ops = { | |
326 | .activate = line_activate, | |
327 | .destruct = line_destruct, | |
328 | }; | |
329 | ||
330 | int line_open(struct tty_struct *tty, struct file *filp) | |
331 | { | |
332 | struct line *line = tty->driver_data; | |
333 | ||
334 | return tty_port_open(&line->port, tty, filp); | |
335 | } | |
336 | ||
337 | int line_install(struct tty_driver *driver, struct tty_struct *tty, | |
338 | struct line *line) | |
339 | { | |
340 | int ret; | |
341 | ||
342 | ret = tty_standard_install(driver, tty); | |
343 | if (ret) | |
344 | return ret; | |
345 | ||
346 | tty->driver_data = line; | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | void line_close(struct tty_struct *tty, struct file * filp) | |
352 | { | |
353 | struct line *line = tty->driver_data; | |
354 | ||
355 | tty_port_close(&line->port, tty, filp); | |
356 | } | |
357 | ||
358 | void line_hangup(struct tty_struct *tty) | |
359 | { | |
360 | struct line *line = tty->driver_data; | |
361 | ||
362 | tty_port_hangup(&line->port); | |
363 | } | |
364 | ||
365 | void close_lines(struct line *lines, int nlines) | |
366 | { | |
367 | int i; | |
368 | ||
369 | for(i = 0; i < nlines; i++) | |
370 | close_chan(&lines[i]); | |
371 | } | |
372 | ||
373 | int setup_one_line(struct line *lines, int n, char *init, | |
374 | const struct chan_opts *opts, char **error_out) | |
375 | { | |
376 | struct line *line = &lines[n]; | |
377 | struct tty_driver *driver = line->driver->driver; | |
378 | int err = -EINVAL; | |
379 | ||
380 | if (line->port.count) { | |
381 | *error_out = "Device is already open"; | |
382 | goto out; | |
383 | } | |
384 | ||
385 | if (!strcmp(init, "none")) { | |
386 | if (line->valid) { | |
387 | line->valid = 0; | |
388 | kfree(line->init_str); | |
389 | tty_unregister_device(driver, n); | |
390 | parse_chan_pair(NULL, line, n, opts, error_out); | |
391 | err = 0; | |
392 | } | |
393 | } else { | |
394 | char *new = kstrdup(init, GFP_KERNEL); | |
395 | if (!new) { | |
396 | *error_out = "Failed to allocate memory"; | |
397 | return -ENOMEM; | |
398 | } | |
399 | if (line->valid) { | |
400 | tty_unregister_device(driver, n); | |
401 | kfree(line->init_str); | |
402 | } | |
403 | line->init_str = new; | |
404 | line->valid = 1; | |
405 | err = parse_chan_pair(new, line, n, opts, error_out); | |
406 | if (!err) { | |
407 | struct device *d = tty_port_register_device(&line->port, | |
408 | driver, n, NULL); | |
409 | if (IS_ERR(d)) { | |
410 | *error_out = "Failed to register device"; | |
411 | err = PTR_ERR(d); | |
412 | parse_chan_pair(NULL, line, n, opts, error_out); | |
413 | } | |
414 | } | |
415 | if (err) { | |
416 | line->init_str = NULL; | |
417 | line->valid = 0; | |
418 | kfree(new); | |
419 | } | |
420 | } | |
421 | out: | |
422 | return err; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Common setup code for both startup command line and mconsole initialization. | |
427 | * @lines contains the array (of size @num) to modify; | |
428 | * @init is the setup string; | |
429 | * @error_out is an error string in the case of failure; | |
430 | */ | |
431 | ||
432 | int line_setup(char **conf, unsigned int num, char **def, | |
433 | char *init, char *name) | |
434 | { | |
435 | char *error; | |
436 | ||
437 | if (*init == '=') { | |
438 | /* | |
439 | * We said con=/ssl= instead of con#=, so we are configuring all | |
440 | * consoles at once. | |
441 | */ | |
442 | *def = init + 1; | |
443 | } else { | |
444 | char *end; | |
445 | unsigned n = simple_strtoul(init, &end, 0); | |
446 | ||
447 | if (*end != '=') { | |
448 | error = "Couldn't parse device number"; | |
449 | goto out; | |
450 | } | |
451 | if (n >= num) { | |
452 | error = "Device number out of range"; | |
453 | goto out; | |
454 | } | |
455 | conf[n] = end + 1; | |
456 | } | |
457 | return 0; | |
458 | ||
459 | out: | |
460 | printk(KERN_ERR "Failed to set up %s with " | |
461 | "configuration string \"%s\" : %s\n", name, init, error); | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | int line_config(struct line *lines, unsigned int num, char *str, | |
466 | const struct chan_opts *opts, char **error_out) | |
467 | { | |
468 | char *end; | |
469 | int n; | |
470 | ||
471 | if (*str == '=') { | |
472 | *error_out = "Can't configure all devices from mconsole"; | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | n = simple_strtoul(str, &end, 0); | |
477 | if (*end++ != '=') { | |
478 | *error_out = "Couldn't parse device number"; | |
479 | return -EINVAL; | |
480 | } | |
481 | if (n >= num) { | |
482 | *error_out = "Device number out of range"; | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
486 | return setup_one_line(lines, n, end, opts, error_out); | |
487 | } | |
488 | ||
489 | int line_get_config(char *name, struct line *lines, unsigned int num, char *str, | |
490 | int size, char **error_out) | |
491 | { | |
492 | struct line *line; | |
493 | char *end; | |
494 | int dev, n = 0; | |
495 | ||
496 | dev = simple_strtoul(name, &end, 0); | |
497 | if ((*end != '\0') || (end == name)) { | |
498 | *error_out = "line_get_config failed to parse device number"; | |
499 | return 0; | |
500 | } | |
501 | ||
502 | if ((dev < 0) || (dev >= num)) { | |
503 | *error_out = "device number out of range"; | |
504 | return 0; | |
505 | } | |
506 | ||
507 | line = &lines[dev]; | |
508 | ||
509 | if (!line->valid) | |
510 | CONFIG_CHUNK(str, size, n, "none", 1); | |
511 | else { | |
512 | struct tty_struct *tty = tty_port_tty_get(&line->port); | |
513 | if (tty == NULL) { | |
514 | CONFIG_CHUNK(str, size, n, line->init_str, 1); | |
515 | } else { | |
516 | n = chan_config_string(line, str, size, error_out); | |
517 | tty_kref_put(tty); | |
518 | } | |
519 | } | |
520 | ||
521 | return n; | |
522 | } | |
523 | ||
524 | int line_id(char **str, int *start_out, int *end_out) | |
525 | { | |
526 | char *end; | |
527 | int n; | |
528 | ||
529 | n = simple_strtoul(*str, &end, 0); | |
530 | if ((*end != '\0') || (end == *str)) | |
531 | return -1; | |
532 | ||
533 | *str = end; | |
534 | *start_out = n; | |
535 | *end_out = n; | |
536 | return n; | |
537 | } | |
538 | ||
539 | int line_remove(struct line *lines, unsigned int num, int n, char **error_out) | |
540 | { | |
541 | if (n >= num) { | |
542 | *error_out = "Device number out of range"; | |
543 | return -EINVAL; | |
544 | } | |
545 | return setup_one_line(lines, n, "none", NULL, error_out); | |
546 | } | |
547 | ||
548 | int register_lines(struct line_driver *line_driver, | |
549 | const struct tty_operations *ops, | |
550 | struct line *lines, int nlines) | |
551 | { | |
552 | struct tty_driver *driver = alloc_tty_driver(nlines); | |
553 | int err; | |
554 | int i; | |
555 | ||
556 | if (!driver) | |
557 | return -ENOMEM; | |
558 | ||
559 | driver->driver_name = line_driver->name; | |
560 | driver->name = line_driver->device_name; | |
561 | driver->major = line_driver->major; | |
562 | driver->minor_start = line_driver->minor_start; | |
563 | driver->type = line_driver->type; | |
564 | driver->subtype = line_driver->subtype; | |
565 | driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
566 | driver->init_termios = tty_std_termios; | |
567 | ||
568 | for (i = 0; i < nlines; i++) { | |
569 | tty_port_init(&lines[i].port); | |
570 | lines[i].port.ops = &line_port_ops; | |
571 | spin_lock_init(&lines[i].lock); | |
572 | lines[i].driver = line_driver; | |
573 | INIT_LIST_HEAD(&lines[i].chan_list); | |
574 | } | |
575 | tty_set_operations(driver, ops); | |
576 | ||
577 | err = tty_register_driver(driver); | |
578 | if (err) { | |
579 | printk(KERN_ERR "register_lines : can't register %s driver\n", | |
580 | line_driver->name); | |
581 | put_tty_driver(driver); | |
582 | for (i = 0; i < nlines; i++) | |
583 | tty_port_destroy(&lines[i].port); | |
584 | return err; | |
585 | } | |
586 | ||
587 | line_driver->driver = driver; | |
588 | mconsole_register_dev(&line_driver->mc); | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static DEFINE_SPINLOCK(winch_handler_lock); | |
593 | static LIST_HEAD(winch_handlers); | |
594 | ||
595 | struct winch { | |
596 | struct list_head list; | |
597 | int fd; | |
598 | int tty_fd; | |
599 | int pid; | |
600 | struct tty_port *port; | |
601 | unsigned long stack; | |
602 | struct work_struct work; | |
603 | }; | |
604 | ||
605 | static void __free_winch(struct work_struct *work) | |
606 | { | |
607 | struct winch *winch = container_of(work, struct winch, work); | |
608 | um_free_irq(WINCH_IRQ, winch); | |
609 | ||
610 | if (winch->pid != -1) | |
611 | os_kill_process(winch->pid, 1); | |
612 | if (winch->stack != 0) | |
613 | free_stack(winch->stack, 0); | |
614 | kfree(winch); | |
615 | } | |
616 | ||
617 | static void free_winch(struct winch *winch) | |
618 | { | |
619 | int fd = winch->fd; | |
620 | winch->fd = -1; | |
621 | if (fd != -1) | |
622 | os_close_file(fd); | |
623 | list_del(&winch->list); | |
624 | __free_winch(&winch->work); | |
625 | } | |
626 | ||
627 | static irqreturn_t winch_interrupt(int irq, void *data) | |
628 | { | |
629 | struct winch *winch = data; | |
630 | struct tty_struct *tty; | |
631 | struct line *line; | |
632 | int fd = winch->fd; | |
633 | int err; | |
634 | char c; | |
635 | struct pid *pgrp; | |
636 | ||
637 | if (fd != -1) { | |
638 | err = generic_read(fd, &c, NULL); | |
639 | if (err < 0) { | |
640 | if (err != -EAGAIN) { | |
641 | winch->fd = -1; | |
642 | list_del(&winch->list); | |
643 | os_close_file(fd); | |
644 | printk(KERN_ERR "winch_interrupt : " | |
645 | "read failed, errno = %d\n", -err); | |
646 | printk(KERN_ERR "fd %d is losing SIGWINCH " | |
647 | "support\n", winch->tty_fd); | |
648 | INIT_WORK(&winch->work, __free_winch); | |
649 | schedule_work(&winch->work); | |
650 | return IRQ_HANDLED; | |
651 | } | |
652 | goto out; | |
653 | } | |
654 | } | |
655 | tty = tty_port_tty_get(winch->port); | |
656 | if (tty != NULL) { | |
657 | line = tty->driver_data; | |
658 | if (line != NULL) { | |
659 | chan_window_size(line, &tty->winsize.ws_row, | |
660 | &tty->winsize.ws_col); | |
661 | pgrp = tty_get_pgrp(tty); | |
662 | if (pgrp) | |
663 | kill_pgrp(pgrp, SIGWINCH, 1); | |
664 | put_pid(pgrp); | |
665 | } | |
666 | tty_kref_put(tty); | |
667 | } | |
668 | out: | |
669 | if (winch->fd != -1) | |
670 | reactivate_fd(winch->fd, WINCH_IRQ); | |
671 | return IRQ_HANDLED; | |
672 | } | |
673 | ||
674 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port, | |
675 | unsigned long stack) | |
676 | { | |
677 | struct winch *winch; | |
678 | ||
679 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); | |
680 | if (winch == NULL) { | |
681 | printk(KERN_ERR "register_winch_irq - kmalloc failed\n"); | |
682 | goto cleanup; | |
683 | } | |
684 | ||
685 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), | |
686 | .fd = fd, | |
687 | .tty_fd = tty_fd, | |
688 | .pid = pid, | |
689 | .port = port, | |
690 | .stack = stack }); | |
691 | ||
692 | if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, | |
693 | IRQF_SHARED, "winch", winch) < 0) { | |
694 | printk(KERN_ERR "register_winch_irq - failed to register " | |
695 | "IRQ\n"); | |
696 | goto out_free; | |
697 | } | |
698 | ||
699 | spin_lock(&winch_handler_lock); | |
700 | list_add(&winch->list, &winch_handlers); | |
701 | spin_unlock(&winch_handler_lock); | |
702 | ||
703 | return; | |
704 | ||
705 | out_free: | |
706 | kfree(winch); | |
707 | cleanup: | |
708 | os_kill_process(pid, 1); | |
709 | os_close_file(fd); | |
710 | if (stack != 0) | |
711 | free_stack(stack, 0); | |
712 | } | |
713 | ||
714 | static void unregister_winch(struct tty_struct *tty) | |
715 | { | |
716 | struct list_head *ele, *next; | |
717 | struct winch *winch; | |
718 | struct tty_struct *wtty; | |
719 | ||
720 | spin_lock(&winch_handler_lock); | |
721 | ||
722 | list_for_each_safe(ele, next, &winch_handlers) { | |
723 | winch = list_entry(ele, struct winch, list); | |
724 | wtty = tty_port_tty_get(winch->port); | |
725 | if (wtty == tty) { | |
726 | free_winch(winch); | |
727 | break; | |
728 | } | |
729 | tty_kref_put(wtty); | |
730 | } | |
731 | spin_unlock(&winch_handler_lock); | |
732 | } | |
733 | ||
734 | static void winch_cleanup(void) | |
735 | { | |
736 | struct list_head *ele, *next; | |
737 | struct winch *winch; | |
738 | ||
739 | spin_lock(&winch_handler_lock); | |
740 | ||
741 | list_for_each_safe(ele, next, &winch_handlers) { | |
742 | winch = list_entry(ele, struct winch, list); | |
743 | free_winch(winch); | |
744 | } | |
745 | ||
746 | spin_unlock(&winch_handler_lock); | |
747 | } | |
748 | __uml_exitcall(winch_cleanup); | |
749 | ||
750 | char *add_xterm_umid(char *base) | |
751 | { | |
752 | char *umid, *title; | |
753 | int len; | |
754 | ||
755 | umid = get_umid(); | |
756 | if (*umid == '\0') | |
757 | return base; | |
758 | ||
759 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; | |
760 | title = kmalloc(len, GFP_KERNEL); | |
761 | if (title == NULL) { | |
762 | printk(KERN_ERR "Failed to allocate buffer for xterm title\n"); | |
763 | return base; | |
764 | } | |
765 | ||
766 | snprintf(title, len, "%s (%s)", base, umid); | |
767 | return title; | |
768 | } |