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Commit | Line | Data |
---|---|---|
165dc591 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/sched.h" | |
7 | #include "linux/slab.h" | |
8 | #include "linux/list.h" | |
9 | #include "linux/kd.h" | |
10 | #include "linux/interrupt.h" | |
1da177e4 LT |
11 | #include "asm/uaccess.h" |
12 | #include "chan_kern.h" | |
13 | #include "irq_user.h" | |
14 | #include "line.h" | |
15 | #include "kern.h" | |
1da177e4 LT |
16 | #include "kern_util.h" |
17 | #include "os.h" | |
18 | #include "irq_kern.h" | |
19 | ||
20 | #define LINE_BUFSIZE 4096 | |
21 | ||
7bea96fd | 22 | static irqreturn_t line_interrupt(int irq, void *data) |
1da177e4 | 23 | { |
165dc591 JD |
24 | struct chan *chan = data; |
25 | struct line *line = chan->line; | |
26 | struct tty_struct *tty = line->tty; | |
1da177e4 LT |
27 | |
28 | if (line) | |
29 | chan_interrupt(&line->chan_list, &line->task, tty, irq); | |
30 | return IRQ_HANDLED; | |
31 | } | |
32 | ||
a2ce7740 | 33 | static void line_timer_cb(struct work_struct *work) |
1da177e4 | 34 | { |
a2ce7740 | 35 | struct line *line = container_of(work, struct line, task.work); |
1da177e4 | 36 | |
e4dcee80 JD |
37 | if(!line->throttled) |
38 | chan_interrupt(&line->chan_list, &line->task, line->tty, | |
39 | line->driver->read_irq); | |
1da177e4 LT |
40 | } |
41 | ||
b97b77cc PBG |
42 | /* Returns the free space inside the ring buffer of this line. |
43 | * | |
44 | * Should be called while holding line->lock (this does not modify datas). | |
45 | */ | |
46 | static int write_room(struct line *line) | |
1da177e4 LT |
47 | { |
48 | int n; | |
49 | ||
b97b77cc PBG |
50 | if (line->buffer == NULL) |
51 | return LINE_BUFSIZE - 1; | |
52 | ||
53 | /* This is for the case where the buffer is wrapped! */ | |
54 | n = line->head - line->tail; | |
1da177e4 | 55 | |
1da177e4 | 56 | if (n <= 0) |
b97b77cc PBG |
57 | n = LINE_BUFSIZE + n; /* The other case */ |
58 | return n - 1; | |
59 | } | |
60 | ||
61 | int line_write_room(struct tty_struct *tty) | |
62 | { | |
63 | struct line *line = tty->driver_data; | |
64 | unsigned long flags; | |
65 | int room; | |
66 | ||
67 | if (tty->stopped) | |
68 | return 0; | |
69 | ||
70 | spin_lock_irqsave(&line->lock, flags); | |
71 | room = write_room(line); | |
72 | spin_unlock_irqrestore(&line->lock, flags); | |
73 | ||
74 | /*XXX: Warning to remove */ | |
75 | if (0 == room) | |
76 | printk(KERN_DEBUG "%s: %s: no room left in buffer\n", | |
77 | __FUNCTION__,tty->name); | |
78 | return room; | |
1da177e4 LT |
79 | } |
80 | ||
b97b77cc PBG |
81 | int line_chars_in_buffer(struct tty_struct *tty) |
82 | { | |
83 | struct line *line = tty->driver_data; | |
84 | unsigned long flags; | |
85 | int ret; | |
86 | ||
87 | spin_lock_irqsave(&line->lock, flags); | |
88 | ||
89 | /*write_room subtracts 1 for the needed NULL, so we readd it.*/ | |
90 | ret = LINE_BUFSIZE - (write_room(line) + 1); | |
91 | spin_unlock_irqrestore(&line->lock, flags); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | /* | |
97 | * This copies the content of buf into the circular buffer associated with | |
98 | * this line. | |
99 | * The return value is the number of characters actually copied, i.e. the ones | |
100 | * for which there was space: this function is not supposed to ever flush out | |
101 | * the circular buffer. | |
102 | * | |
103 | * Must be called while holding line->lock! | |
104 | */ | |
1da177e4 LT |
105 | static int buffer_data(struct line *line, const char *buf, int len) |
106 | { | |
107 | int end, room; | |
108 | ||
109 | if(line->buffer == NULL){ | |
110 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); | |
111 | if (line->buffer == NULL) { | |
112 | printk("buffer_data - atomic allocation failed\n"); | |
113 | return(0); | |
114 | } | |
115 | line->head = line->buffer; | |
116 | line->tail = line->buffer; | |
117 | } | |
118 | ||
119 | room = write_room(line); | |
120 | len = (len > room) ? room : len; | |
121 | ||
122 | end = line->buffer + LINE_BUFSIZE - line->tail; | |
b97b77cc PBG |
123 | |
124 | if (len < end){ | |
1da177e4 LT |
125 | memcpy(line->tail, buf, len); |
126 | line->tail += len; | |
d50084a2 JD |
127 | } |
128 | else { | |
b97b77cc | 129 | /* The circular buffer is wrapping */ |
1da177e4 LT |
130 | memcpy(line->tail, buf, end); |
131 | buf += end; | |
132 | memcpy(line->buffer, buf, len - end); | |
133 | line->tail = line->buffer + len - end; | |
134 | } | |
135 | ||
b97b77cc | 136 | return len; |
1da177e4 LT |
137 | } |
138 | ||
b97b77cc PBG |
139 | /* |
140 | * Flushes the ring buffer to the output channels. That is, write_chan is | |
141 | * called, passing it line->head as buffer, and an appropriate count. | |
142 | * | |
143 | * On exit, returns 1 when the buffer is empty, | |
144 | * 0 when the buffer is not empty on exit, | |
145 | * and -errno when an error occurred. | |
146 | * | |
147 | * Must be called while holding line->lock!*/ | |
1da177e4 LT |
148 | static int flush_buffer(struct line *line) |
149 | { | |
150 | int n, count; | |
151 | ||
152 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
b97b77cc | 153 | return 1; |
1da177e4 LT |
154 | |
155 | if (line->tail < line->head) { | |
b97b77cc | 156 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ |
1da177e4 | 157 | count = line->buffer + LINE_BUFSIZE - line->head; |
b97b77cc | 158 | |
1da177e4 LT |
159 | n = write_chan(&line->chan_list, line->head, count, |
160 | line->driver->write_irq); | |
161 | if (n < 0) | |
b97b77cc PBG |
162 | return n; |
163 | if (n == count) { | |
164 | /* We have flushed from ->head to buffer end, now we | |
165 | * must flush only from the beginning to ->tail.*/ | |
1da177e4 | 166 | line->head = line->buffer; |
b97b77cc | 167 | } else { |
1da177e4 | 168 | line->head += n; |
b97b77cc | 169 | return 0; |
1da177e4 LT |
170 | } |
171 | } | |
172 | ||
173 | count = line->tail - line->head; | |
d50084a2 | 174 | n = write_chan(&line->chan_list, line->head, count, |
1da177e4 | 175 | line->driver->write_irq); |
b97b77cc PBG |
176 | |
177 | if(n < 0) | |
178 | return n; | |
1da177e4 LT |
179 | |
180 | line->head += n; | |
b97b77cc PBG |
181 | return line->head == line->tail; |
182 | } | |
183 | ||
184 | void line_flush_buffer(struct tty_struct *tty) | |
185 | { | |
186 | struct line *line = tty->driver_data; | |
187 | unsigned long flags; | |
188 | int err; | |
189 | ||
190 | /*XXX: copied from line_write, verify if it is correct!*/ | |
191 | if(tty->stopped) | |
192 | return; | |
b97b77cc PBG |
193 | |
194 | spin_lock_irqsave(&line->lock, flags); | |
195 | err = flush_buffer(line); | |
196 | /*if (err == 1) | |
197 | err = 0;*/ | |
198 | spin_unlock_irqrestore(&line->lock, flags); | |
199 | //return err; | |
200 | } | |
201 | ||
202 | /* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer | |
203 | * and ->write. Hope it's not that bad.*/ | |
204 | void line_flush_chars(struct tty_struct *tty) | |
205 | { | |
206 | line_flush_buffer(tty); | |
207 | } | |
208 | ||
209 | void line_put_char(struct tty_struct *tty, unsigned char ch) | |
210 | { | |
211 | line_write(tty, &ch, sizeof(ch)); | |
1da177e4 LT |
212 | } |
213 | ||
214 | int line_write(struct tty_struct *tty, const unsigned char *buf, int len) | |
215 | { | |
216 | struct line *line = tty->driver_data; | |
217 | unsigned long flags; | |
218 | int n, err, ret = 0; | |
219 | ||
b97b77cc PBG |
220 | if(tty->stopped) |
221 | return 0; | |
1da177e4 | 222 | |
b97b77cc PBG |
223 | spin_lock_irqsave(&line->lock, flags); |
224 | if (line->head != line->tail) { | |
1da177e4 LT |
225 | ret = buffer_data(line, buf, len); |
226 | err = flush_buffer(line); | |
b97b77cc | 227 | if (err <= 0 && (err != -EAGAIN || !ret)) |
1da177e4 | 228 | ret = err; |
b97b77cc | 229 | } else { |
d50084a2 | 230 | n = write_chan(&line->chan_list, buf, len, |
1da177e4 | 231 | line->driver->write_irq); |
b97b77cc | 232 | if (n < 0) { |
1da177e4 LT |
233 | ret = n; |
234 | goto out_up; | |
235 | } | |
236 | ||
237 | len -= n; | |
238 | ret += n; | |
b97b77cc | 239 | if (len > 0) |
1da177e4 LT |
240 | ret += buffer_data(line, buf + n, len); |
241 | } | |
b97b77cc PBG |
242 | out_up: |
243 | spin_unlock_irqrestore(&line->lock, flags); | |
244 | return ret; | |
1da177e4 LT |
245 | } |
246 | ||
606d099c | 247 | void line_set_termios(struct tty_struct *tty, struct ktermios * old) |
1da177e4 LT |
248 | { |
249 | /* nothing */ | |
250 | } | |
251 | ||
5e7672ec | 252 | static const struct { |
1da177e4 LT |
253 | int cmd; |
254 | char *level; | |
255 | char *name; | |
256 | } tty_ioctls[] = { | |
257 | /* don't print these, they flood the log ... */ | |
258 | { TCGETS, NULL, "TCGETS" }, | |
259 | { TCSETS, NULL, "TCSETS" }, | |
260 | { TCSETSW, NULL, "TCSETSW" }, | |
261 | { TCFLSH, NULL, "TCFLSH" }, | |
262 | { TCSBRK, NULL, "TCSBRK" }, | |
263 | ||
264 | /* general tty stuff */ | |
265 | { TCSETSF, KERN_DEBUG, "TCSETSF" }, | |
266 | { TCGETA, KERN_DEBUG, "TCGETA" }, | |
267 | { TIOCMGET, KERN_DEBUG, "TIOCMGET" }, | |
268 | { TCSBRKP, KERN_DEBUG, "TCSBRKP" }, | |
269 | { TIOCMSET, KERN_DEBUG, "TIOCMSET" }, | |
270 | ||
271 | /* linux-specific ones */ | |
272 | { TIOCLINUX, KERN_INFO, "TIOCLINUX" }, | |
273 | { KDGKBMODE, KERN_INFO, "KDGKBMODE" }, | |
274 | { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" }, | |
275 | { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" }, | |
276 | }; | |
277 | ||
278 | int line_ioctl(struct tty_struct *tty, struct file * file, | |
279 | unsigned int cmd, unsigned long arg) | |
280 | { | |
281 | int ret; | |
282 | int i; | |
283 | ||
284 | ret = 0; | |
285 | switch(cmd) { | |
286 | #ifdef TIOCGETP | |
287 | case TIOCGETP: | |
288 | case TIOCSETP: | |
289 | case TIOCSETN: | |
290 | #endif | |
291 | #ifdef TIOCGETC | |
292 | case TIOCGETC: | |
293 | case TIOCSETC: | |
294 | #endif | |
295 | #ifdef TIOCGLTC | |
296 | case TIOCGLTC: | |
297 | case TIOCSLTC: | |
298 | #endif | |
299 | case TCGETS: | |
300 | case TCSETSF: | |
301 | case TCSETSW: | |
302 | case TCSETS: | |
303 | case TCGETA: | |
304 | case TCSETAF: | |
305 | case TCSETAW: | |
306 | case TCSETA: | |
307 | case TCXONC: | |
308 | case TCFLSH: | |
309 | case TIOCOUTQ: | |
310 | case TIOCINQ: | |
311 | case TIOCGLCKTRMIOS: | |
312 | case TIOCSLCKTRMIOS: | |
313 | case TIOCPKT: | |
314 | case TIOCGSOFTCAR: | |
315 | case TIOCSSOFTCAR: | |
316 | return -ENOIOCTLCMD; | |
317 | #if 0 | |
318 | case TCwhatever: | |
319 | /* do something */ | |
320 | break; | |
321 | #endif | |
322 | default: | |
323 | for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++) | |
324 | if (cmd == tty_ioctls[i].cmd) | |
325 | break; | |
326 | if (i < ARRAY_SIZE(tty_ioctls)) { | |
327 | if (NULL != tty_ioctls[i].level) | |
328 | printk("%s%s: %s: ioctl %s called\n", | |
329 | tty_ioctls[i].level, __FUNCTION__, | |
330 | tty->name, tty_ioctls[i].name); | |
331 | } else { | |
332 | printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n", | |
333 | __FUNCTION__, tty->name, cmd); | |
334 | } | |
335 | ret = -ENOIOCTLCMD; | |
336 | break; | |
337 | } | |
b97b77cc | 338 | return ret; |
1da177e4 LT |
339 | } |
340 | ||
e4dcee80 JD |
341 | void line_throttle(struct tty_struct *tty) |
342 | { | |
343 | struct line *line = tty->driver_data; | |
344 | ||
345 | deactivate_chan(&line->chan_list, line->driver->read_irq); | |
346 | line->throttled = 1; | |
347 | } | |
348 | ||
349 | void line_unthrottle(struct tty_struct *tty) | |
350 | { | |
351 | struct line *line = tty->driver_data; | |
352 | ||
353 | line->throttled = 0; | |
354 | chan_interrupt(&line->chan_list, &line->task, tty, | |
355 | line->driver->read_irq); | |
356 | ||
357 | /* Maybe there is enough stuff pending that calling the interrupt | |
358 | * throttles us again. In this case, line->throttled will be 1 | |
359 | * again and we shouldn't turn the interrupt back on. | |
360 | */ | |
361 | if(!line->throttled) | |
362 | reactivate_chan(&line->chan_list, line->driver->read_irq); | |
363 | } | |
364 | ||
7bea96fd | 365 | static irqreturn_t line_write_interrupt(int irq, void *data) |
1da177e4 | 366 | { |
165dc591 JD |
367 | struct chan *chan = data; |
368 | struct line *line = chan->line; | |
369 | struct tty_struct *tty = line->tty; | |
1da177e4 LT |
370 | int err; |
371 | ||
ec0ac8ad | 372 | /* Interrupts are disabled here because we registered the interrupt with |
bd6aa650 | 373 | * IRQF_DISABLED (see line_setup_irq).*/ |
b97b77cc | 374 | |
ec0ac8ad | 375 | spin_lock(&line->lock); |
1da177e4 | 376 | err = flush_buffer(line); |
b97b77cc PBG |
377 | if (err == 0) { |
378 | return IRQ_NONE; | |
379 | } else if(err < 0) { | |
1da177e4 LT |
380 | line->head = line->buffer; |
381 | line->tail = line->buffer; | |
382 | } | |
ec0ac8ad | 383 | spin_unlock(&line->lock); |
1da177e4 LT |
384 | |
385 | if(tty == NULL) | |
b97b77cc | 386 | return IRQ_NONE; |
1da177e4 | 387 | |
b97b77cc | 388 | if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && |
1da177e4 LT |
389 | (tty->ldisc.write_wakeup != NULL)) |
390 | (tty->ldisc.write_wakeup)(tty); | |
165dc591 | 391 | |
1da177e4 LT |
392 | /* BLOCKING mode |
393 | * In blocking mode, everything sleeps on tty->write_wait. | |
394 | * Sleeping in the console driver would break non-blocking | |
395 | * writes. | |
396 | */ | |
397 | ||
b97b77cc | 398 | if (waitqueue_active(&tty->write_wait)) |
1da177e4 | 399 | wake_up_interruptible(&tty->write_wait); |
b97b77cc | 400 | return IRQ_HANDLED; |
1da177e4 LT |
401 | } |
402 | ||
165dc591 | 403 | int line_setup_irq(int fd, int input, int output, struct line *line, void *data) |
1da177e4 | 404 | { |
5e7672ec | 405 | const struct line_driver *driver = line->driver; |
bd6aa650 | 406 | int err = 0, flags = IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM; |
1da177e4 | 407 | |
b97b77cc PBG |
408 | if (input) |
409 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
d50084a2 | 410 | line_interrupt, flags, |
165dc591 | 411 | driver->read_irq_name, data); |
b97b77cc PBG |
412 | if (err) |
413 | return err; | |
414 | if (output) | |
415 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
d50084a2 | 416 | line_write_interrupt, flags, |
165dc591 | 417 | driver->write_irq_name, data); |
1da177e4 | 418 | line->have_irq = 1; |
b97b77cc | 419 | return err; |
1da177e4 LT |
420 | } |
421 | ||
d79a5809 JD |
422 | /* Normally, a driver like this can rely mostly on the tty layer |
423 | * locking, particularly when it comes to the driver structure. | |
424 | * However, in this case, mconsole requests can come in "from the | |
425 | * side", and race with opens and closes. | |
426 | * | |
c6256c68 JD |
427 | * mconsole config requests will want to be sure the device isn't in |
428 | * use, and get_config, open, and close will want a stable | |
429 | * configuration. The checking and modification of the configuration | |
430 | * is done under a spinlock. Checking whether the device is in use is | |
431 | * line->tty->count > 1, also under the spinlock. | |
d79a5809 | 432 | * |
c6256c68 JD |
433 | * tty->count serves to decide whether the device should be enabled or |
434 | * disabled on the host. If it's equal to 1, then we are doing the | |
435 | * first open or last close. Otherwise, open and close just return. | |
d79a5809 JD |
436 | */ |
437 | ||
1f80171e | 438 | int line_open(struct line *lines, struct tty_struct *tty) |
1da177e4 | 439 | { |
d79a5809 | 440 | struct line *line = &lines[tty->index]; |
165dc591 | 441 | int err = -ENODEV; |
1da177e4 | 442 | |
d79a5809 JD |
443 | spin_lock(&line->count_lock); |
444 | if(!line->valid) | |
445 | goto out_unlock; | |
1da177e4 | 446 | |
d79a5809 JD |
447 | err = 0; |
448 | if(tty->count > 1) | |
449 | goto out_unlock; | |
450 | ||
d79a5809 | 451 | spin_unlock(&line->count_lock); |
1f80171e | 452 | |
165dc591 JD |
453 | tty->driver_data = line; |
454 | line->tty = tty; | |
165dc591 | 455 | |
d79a5809 JD |
456 | enable_chan(line); |
457 | INIT_DELAYED_WORK(&line->task, line_timer_cb); | |
165dc591 | 458 | |
d79a5809 JD |
459 | if(!line->sigio){ |
460 | chan_enable_winch(&line->chan_list, tty); | |
461 | line->sigio = 1; | |
1da177e4 | 462 | } |
1da177e4 | 463 | |
d79a5809 JD |
464 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, |
465 | &tty->winsize.ws_col); | |
466 | ||
d79a5809 JD |
467 | return err; |
468 | ||
469 | out_unlock: | |
470 | spin_unlock(&line->count_lock); | |
b97b77cc | 471 | return err; |
1da177e4 LT |
472 | } |
473 | ||
cd2ee4a3 JD |
474 | static void unregister_winch(struct tty_struct *tty); |
475 | ||
1da177e4 LT |
476 | void line_close(struct tty_struct *tty, struct file * filp) |
477 | { | |
478 | struct line *line = tty->driver_data; | |
479 | ||
d79a5809 JD |
480 | /* If line_open fails (and tty->driver_data is never set), |
481 | * tty_open will call line_close. So just return in this case. | |
482 | */ | |
483 | if(line == NULL) | |
484 | return; | |
b97b77cc PBG |
485 | |
486 | /* We ignore the error anyway! */ | |
487 | flush_buffer(line); | |
488 | ||
d79a5809 JD |
489 | spin_lock(&line->count_lock); |
490 | if(!line->valid) | |
491 | goto out_unlock; | |
cd2ee4a3 | 492 | |
d79a5809 JD |
493 | if(tty->count > 1) |
494 | goto out_unlock; | |
495 | ||
d79a5809 JD |
496 | spin_unlock(&line->count_lock); |
497 | ||
498 | line->tty = NULL; | |
499 | tty->driver_data = NULL; | |
500 | ||
501 | if(line->sigio){ | |
502 | unregister_winch(tty); | |
503 | line->sigio = 0; | |
cd2ee4a3 JD |
504 | } |
505 | ||
d79a5809 JD |
506 | return; |
507 | ||
508 | out_unlock: | |
509 | spin_unlock(&line->count_lock); | |
1da177e4 LT |
510 | } |
511 | ||
512 | void close_lines(struct line *lines, int nlines) | |
513 | { | |
514 | int i; | |
515 | ||
516 | for(i = 0; i < nlines; i++) | |
165dc591 | 517 | close_chan(&lines[i].chan_list, 0); |
1da177e4 LT |
518 | } |
519 | ||
f28169d2 JD |
520 | static int setup_one_line(struct line *lines, int n, char *init, int init_prio, |
521 | char **error_out) | |
d79a5809 JD |
522 | { |
523 | struct line *line = &lines[n]; | |
f28169d2 | 524 | int err = -EINVAL; |
d79a5809 JD |
525 | |
526 | spin_lock(&line->count_lock); | |
527 | ||
528 | if(line->tty != NULL){ | |
f28169d2 | 529 | *error_out = "Device is already open"; |
d79a5809 JD |
530 | goto out; |
531 | } | |
532 | ||
533 | if (line->init_pri <= init_prio){ | |
534 | line->init_pri = init_prio; | |
535 | if (!strcmp(init, "none")) | |
536 | line->valid = 0; | |
537 | else { | |
538 | line->init_str = init; | |
539 | line->valid = 1; | |
540 | } | |
541 | } | |
f28169d2 | 542 | err = 0; |
d79a5809 JD |
543 | out: |
544 | spin_unlock(&line->count_lock); | |
f28169d2 | 545 | return err; |
d79a5809 JD |
546 | } |
547 | ||
b97b77cc | 548 | /* Common setup code for both startup command line and mconsole initialization. |
4b3f686d | 549 | * @lines contains the array (of size @num) to modify; |
b97b77cc | 550 | * @init is the setup string; |
f28169d2 | 551 | * @error_out is an error string in the case of failure; |
d571cd18 | 552 | */ |
b97b77cc | 553 | |
f28169d2 JD |
554 | int line_setup(struct line *lines, unsigned int num, char *init, |
555 | char **error_out) | |
1da177e4 | 556 | { |
f28169d2 | 557 | int i, n, err; |
1da177e4 LT |
558 | char *end; |
559 | ||
b97b77cc PBG |
560 | if(*init == '=') { |
561 | /* We said con=/ssl= instead of con#=, so we are configuring all | |
562 | * consoles at once.*/ | |
563 | n = -1; | |
d50084a2 JD |
564 | } |
565 | else { | |
1da177e4 LT |
566 | n = simple_strtoul(init, &end, 0); |
567 | if(*end != '='){ | |
f28169d2 JD |
568 | *error_out = "Couldn't parse device number"; |
569 | return -EINVAL; | |
1da177e4 LT |
570 | } |
571 | init = end; | |
572 | } | |
573 | init++; | |
b97b77cc PBG |
574 | |
575 | if (n >= (signed int) num) { | |
f28169d2 JD |
576 | *error_out = "Device number out of range"; |
577 | return -EINVAL; | |
578 | } | |
579 | else if (n >= 0){ | |
580 | err = setup_one_line(lines, n, init, INIT_ONE, error_out); | |
581 | if(err) | |
582 | return err; | |
d50084a2 | 583 | } |
d50084a2 | 584 | else { |
f28169d2 JD |
585 | for(i = 0; i < num; i++){ |
586 | err = setup_one_line(lines, i, init, INIT_ALL, | |
587 | error_out); | |
588 | if(err) | |
589 | return err; | |
590 | } | |
1da177e4 | 591 | } |
418e55d4 | 592 | return n == -1 ? num : n; |
1da177e4 LT |
593 | } |
594 | ||
1f80171e | 595 | int line_config(struct line *lines, unsigned int num, char *str, |
f28169d2 | 596 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 597 | { |
1f80171e | 598 | struct line *line; |
970d6e3a | 599 | char *new; |
418e55d4 | 600 | int n; |
1da177e4 | 601 | |
d571cd18 | 602 | if(*str == '='){ |
f28169d2 JD |
603 | *error_out = "Can't configure all devices from mconsole"; |
604 | return -EINVAL; | |
d571cd18 JD |
605 | } |
606 | ||
970d6e3a | 607 | new = kstrdup(str, GFP_KERNEL); |
1da177e4 | 608 | if(new == NULL){ |
f28169d2 JD |
609 | *error_out = "Failed to allocate memory"; |
610 | return -ENOMEM; | |
1da177e4 | 611 | } |
f28169d2 | 612 | n = line_setup(lines, num, new, error_out); |
1f80171e | 613 | if(n < 0) |
f28169d2 | 614 | return n; |
1f80171e JD |
615 | |
616 | line = &lines[n]; | |
f28169d2 | 617 | return parse_chan_pair(line->init_str, line, n, opts, error_out); |
1da177e4 LT |
618 | } |
619 | ||
b97b77cc | 620 | int line_get_config(char *name, struct line *lines, unsigned int num, char *str, |
1da177e4 LT |
621 | int size, char **error_out) |
622 | { | |
623 | struct line *line; | |
624 | char *end; | |
625 | int dev, n = 0; | |
626 | ||
627 | dev = simple_strtoul(name, &end, 0); | |
628 | if((*end != '\0') || (end == name)){ | |
629 | *error_out = "line_get_config failed to parse device number"; | |
b97b77cc | 630 | return 0; |
1da177e4 LT |
631 | } |
632 | ||
633 | if((dev < 0) || (dev >= num)){ | |
b97b77cc PBG |
634 | *error_out = "device number out of range"; |
635 | return 0; | |
1da177e4 LT |
636 | } |
637 | ||
638 | line = &lines[dev]; | |
639 | ||
d79a5809 | 640 | spin_lock(&line->count_lock); |
1da177e4 LT |
641 | if(!line->valid) |
642 | CONFIG_CHUNK(str, size, n, "none", 1); | |
165dc591 | 643 | else if(line->tty == NULL) |
1da177e4 LT |
644 | CONFIG_CHUNK(str, size, n, line->init_str, 1); |
645 | else n = chan_config_string(&line->chan_list, str, size, error_out); | |
d79a5809 | 646 | spin_unlock(&line->count_lock); |
1da177e4 | 647 | |
b97b77cc | 648 | return n; |
1da177e4 LT |
649 | } |
650 | ||
29d56cfe JD |
651 | int line_id(char **str, int *start_out, int *end_out) |
652 | { | |
653 | char *end; | |
654 | int n; | |
655 | ||
656 | n = simple_strtoul(*str, &end, 0); | |
657 | if((*end != '\0') || (end == *str)) | |
658 | return -1; | |
659 | ||
660 | *str = end; | |
661 | *start_out = n; | |
662 | *end_out = n; | |
663 | return n; | |
664 | } | |
665 | ||
f28169d2 | 666 | int line_remove(struct line *lines, unsigned int num, int n, char **error_out) |
1da177e4 | 667 | { |
418e55d4 | 668 | int err; |
1da177e4 LT |
669 | char config[sizeof("conxxxx=none\0")]; |
670 | ||
29d56cfe | 671 | sprintf(config, "%d=none", n); |
f28169d2 | 672 | err = line_setup(lines, num, config, error_out); |
418e55d4 JD |
673 | if(err >= 0) |
674 | err = 0; | |
675 | return err; | |
1da177e4 LT |
676 | } |
677 | ||
d5c9ffc6 JD |
678 | struct tty_driver *register_lines(struct line_driver *line_driver, |
679 | const struct tty_operations *ops, | |
680 | struct line *lines, int nlines) | |
1da177e4 LT |
681 | { |
682 | int i; | |
683 | struct tty_driver *driver = alloc_tty_driver(nlines); | |
684 | ||
685 | if (!driver) | |
686 | return NULL; | |
687 | ||
688 | driver->driver_name = line_driver->name; | |
689 | driver->name = line_driver->device_name; | |
1da177e4 LT |
690 | driver->major = line_driver->major; |
691 | driver->minor_start = line_driver->minor_start; | |
692 | driver->type = line_driver->type; | |
693 | driver->subtype = line_driver->subtype; | |
694 | driver->flags = TTY_DRIVER_REAL_RAW; | |
695 | driver->init_termios = tty_std_termios; | |
696 | tty_set_operations(driver, ops); | |
697 | ||
698 | if (tty_register_driver(driver)) { | |
699 | printk("%s: can't register %s driver\n", | |
700 | __FUNCTION__,line_driver->name); | |
701 | put_tty_driver(driver); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | for(i = 0; i < nlines; i++){ | |
d50084a2 | 706 | if(!lines[i].valid) |
1da177e4 LT |
707 | tty_unregister_device(driver, i); |
708 | } | |
709 | ||
710 | mconsole_register_dev(&line_driver->mc); | |
711 | return driver; | |
712 | } | |
713 | ||
9010772c JD |
714 | static DEFINE_SPINLOCK(winch_handler_lock); |
715 | static LIST_HEAD(winch_handlers); | |
605a69ac | 716 | |
1f80171e | 717 | void lines_init(struct line *lines, int nlines, struct chan_opts *opts) |
1da177e4 LT |
718 | { |
719 | struct line *line; | |
f28169d2 | 720 | char *error; |
1da177e4 LT |
721 | int i; |
722 | ||
723 | for(i = 0; i < nlines; i++){ | |
724 | line = &lines[i]; | |
725 | INIT_LIST_HEAD(&line->chan_list); | |
9010772c | 726 | |
d50084a2 JD |
727 | if(line->init_str == NULL) |
728 | continue; | |
729 | ||
730 | line->init_str = kstrdup(line->init_str, GFP_KERNEL); | |
731 | if(line->init_str == NULL) | |
732 | printk("lines_init - kstrdup returned NULL\n"); | |
1f80171e | 733 | |
f28169d2 JD |
734 | if(parse_chan_pair(line->init_str, line, i, opts, &error)){ |
735 | printk("parse_chan_pair failed for device %d : %s\n", | |
736 | i, error); | |
1f80171e JD |
737 | line->valid = 0; |
738 | } | |
1da177e4 LT |
739 | } |
740 | } | |
741 | ||
742 | struct winch { | |
743 | struct list_head list; | |
744 | int fd; | |
745 | int tty_fd; | |
746 | int pid; | |
747 | struct tty_struct *tty; | |
748 | }; | |
749 | ||
7bea96fd | 750 | static irqreturn_t winch_interrupt(int irq, void *data) |
1da177e4 LT |
751 | { |
752 | struct winch *winch = data; | |
753 | struct tty_struct *tty; | |
754 | struct line *line; | |
755 | int err; | |
756 | char c; | |
757 | ||
758 | if(winch->fd != -1){ | |
759 | err = generic_read(winch->fd, &c, NULL); | |
760 | if(err < 0){ | |
761 | if(err != -EAGAIN){ | |
762 | printk("winch_interrupt : read failed, " | |
763 | "errno = %d\n", -err); | |
764 | printk("fd %d is losing SIGWINCH support\n", | |
765 | winch->tty_fd); | |
b97b77cc | 766 | return IRQ_HANDLED; |
1da177e4 LT |
767 | } |
768 | goto out; | |
769 | } | |
770 | } | |
771 | tty = winch->tty; | |
772 | if (tty != NULL) { | |
773 | line = tty->driver_data; | |
d50084a2 | 774 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, |
1da177e4 | 775 | &tty->winsize.ws_col); |
ab521dc0 | 776 | kill_pgrp(tty->pgrp, SIGWINCH, 1); |
1da177e4 LT |
777 | } |
778 | out: | |
779 | if(winch->fd != -1) | |
780 | reactivate_fd(winch->fd, WINCH_IRQ); | |
b97b77cc | 781 | return IRQ_HANDLED; |
1da177e4 LT |
782 | } |
783 | ||
1da177e4 LT |
784 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty) |
785 | { | |
786 | struct winch *winch; | |
787 | ||
1da177e4 LT |
788 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); |
789 | if (winch == NULL) { | |
790 | printk("register_winch_irq - kmalloc failed\n"); | |
605a69ac | 791 | return; |
1da177e4 | 792 | } |
605a69ac | 793 | |
1da177e4 LT |
794 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), |
795 | .fd = fd, | |
796 | .tty_fd = tty_fd, | |
797 | .pid = pid, | |
798 | .tty = tty }); | |
605a69ac PBG |
799 | |
800 | spin_lock(&winch_handler_lock); | |
1da177e4 | 801 | list_add(&winch->list, &winch_handlers); |
605a69ac PBG |
802 | spin_unlock(&winch_handler_lock); |
803 | ||
b97b77cc | 804 | if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, |
bd6aa650 | 805 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 LT |
806 | "winch", winch) < 0) |
807 | printk("register_winch_irq - failed to register IRQ\n"); | |
1da177e4 LT |
808 | } |
809 | ||
e464bf2b JD |
810 | static void free_winch(struct winch *winch) |
811 | { | |
812 | list_del(&winch->list); | |
813 | ||
814 | if(winch->pid != -1) | |
815 | os_kill_process(winch->pid, 1); | |
816 | if(winch->fd != -1) | |
817 | os_close_file(winch->fd); | |
818 | ||
819 | free_irq(WINCH_IRQ, winch); | |
820 | kfree(winch); | |
821 | } | |
822 | ||
cd2ee4a3 JD |
823 | static void unregister_winch(struct tty_struct *tty) |
824 | { | |
825 | struct list_head *ele; | |
e464bf2b | 826 | struct winch *winch; |
cd2ee4a3 | 827 | |
605a69ac | 828 | spin_lock(&winch_handler_lock); |
e464bf2b | 829 | |
cd2ee4a3 JD |
830 | list_for_each(ele, &winch_handlers){ |
831 | winch = list_entry(ele, struct winch, list); | |
832 | if(winch->tty == tty){ | |
e464bf2b JD |
833 | free_winch(winch); |
834 | break; | |
cd2ee4a3 JD |
835 | } |
836 | } | |
605a69ac | 837 | spin_unlock(&winch_handler_lock); |
cd2ee4a3 JD |
838 | } |
839 | ||
1da177e4 LT |
840 | static void winch_cleanup(void) |
841 | { | |
e464bf2b | 842 | struct list_head *ele, *next; |
1da177e4 LT |
843 | struct winch *winch; |
844 | ||
e464bf2b JD |
845 | spin_lock(&winch_handler_lock); |
846 | ||
847 | list_for_each_safe(ele, next, &winch_handlers){ | |
1da177e4 | 848 | winch = list_entry(ele, struct winch, list); |
e464bf2b | 849 | free_winch(winch); |
1da177e4 | 850 | } |
e464bf2b JD |
851 | |
852 | spin_unlock(&winch_handler_lock); | |
1da177e4 LT |
853 | } |
854 | __uml_exitcall(winch_cleanup); | |
855 | ||
856 | char *add_xterm_umid(char *base) | |
857 | { | |
858 | char *umid, *title; | |
859 | int len; | |
860 | ||
7eebe8a9 JD |
861 | umid = get_umid(); |
862 | if(*umid == '\0') | |
b97b77cc | 863 | return base; |
165dc591 | 864 | |
1da177e4 LT |
865 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; |
866 | title = kmalloc(len, GFP_KERNEL); | |
867 | if(title == NULL){ | |
868 | printk("Failed to allocate buffer for xterm title\n"); | |
b97b77cc | 869 | return base; |
1da177e4 LT |
870 | } |
871 | ||
872 | snprintf(title, len, "%s (%s)", base, umid); | |
b97b77cc | 873 | return title; |
1da177e4 | 874 | } |