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Commit | Line | Data |
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165dc591 | 1 | /* |
2f8a2dc2 | 2 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
2f8a2dc2 | 6 | #include "linux/irqreturn.h" |
1da177e4 | 7 | #include "linux/kd.h" |
1da177e4 | 8 | #include "chan_kern.h" |
2f8a2dc2 | 9 | #include "irq_kern.h" |
1da177e4 | 10 | #include "irq_user.h" |
1da177e4 | 11 | #include "os.h" |
1da177e4 LT |
12 | |
13 | #define LINE_BUFSIZE 4096 | |
14 | ||
7bea96fd | 15 | static irqreturn_t line_interrupt(int irq, void *data) |
1da177e4 | 16 | { |
165dc591 JD |
17 | struct chan *chan = data; |
18 | struct line *line = chan->line; | |
19 | struct tty_struct *tty = line->tty; | |
1da177e4 LT |
20 | |
21 | if (line) | |
22 | chan_interrupt(&line->chan_list, &line->task, tty, irq); | |
23 | return IRQ_HANDLED; | |
24 | } | |
25 | ||
a2ce7740 | 26 | static void line_timer_cb(struct work_struct *work) |
1da177e4 | 27 | { |
a2ce7740 | 28 | struct line *line = container_of(work, struct line, task.work); |
1da177e4 | 29 | |
2f8a2dc2 | 30 | if (!line->throttled) |
e4dcee80 JD |
31 | chan_interrupt(&line->chan_list, &line->task, line->tty, |
32 | line->driver->read_irq); | |
1da177e4 LT |
33 | } |
34 | ||
2f8a2dc2 JD |
35 | /* |
36 | * Returns the free space inside the ring buffer of this line. | |
b97b77cc | 37 | * |
b60745b9 | 38 | * Should be called while holding line->lock (this does not modify data). |
b97b77cc PBG |
39 | */ |
40 | static int write_room(struct line *line) | |
1da177e4 LT |
41 | { |
42 | int n; | |
43 | ||
b97b77cc PBG |
44 | if (line->buffer == NULL) |
45 | return LINE_BUFSIZE - 1; | |
46 | ||
47 | /* This is for the case where the buffer is wrapped! */ | |
48 | n = line->head - line->tail; | |
1da177e4 | 49 | |
1da177e4 | 50 | if (n <= 0) |
b97b77cc PBG |
51 | n = LINE_BUFSIZE + n; /* The other case */ |
52 | return n - 1; | |
53 | } | |
54 | ||
55 | int line_write_room(struct tty_struct *tty) | |
56 | { | |
57 | struct line *line = tty->driver_data; | |
58 | unsigned long flags; | |
59 | int room; | |
60 | ||
61 | if (tty->stopped) | |
62 | return 0; | |
63 | ||
64 | spin_lock_irqsave(&line->lock, flags); | |
65 | room = write_room(line); | |
66 | spin_unlock_irqrestore(&line->lock, flags); | |
67 | ||
68 | /*XXX: Warning to remove */ | |
69 | if (0 == room) | |
70 | printk(KERN_DEBUG "%s: %s: no room left in buffer\n", | |
71 | __FUNCTION__,tty->name); | |
72 | return room; | |
1da177e4 LT |
73 | } |
74 | ||
b97b77cc PBG |
75 | int line_chars_in_buffer(struct tty_struct *tty) |
76 | { | |
77 | struct line *line = tty->driver_data; | |
78 | unsigned long flags; | |
79 | int ret; | |
80 | ||
81 | spin_lock_irqsave(&line->lock, flags); | |
82 | ||
83 | /*write_room subtracts 1 for the needed NULL, so we readd it.*/ | |
84 | ret = LINE_BUFSIZE - (write_room(line) + 1); | |
85 | spin_unlock_irqrestore(&line->lock, flags); | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
90 | /* | |
91 | * This copies the content of buf into the circular buffer associated with | |
92 | * this line. | |
93 | * The return value is the number of characters actually copied, i.e. the ones | |
94 | * for which there was space: this function is not supposed to ever flush out | |
95 | * the circular buffer. | |
96 | * | |
97 | * Must be called while holding line->lock! | |
98 | */ | |
1da177e4 LT |
99 | static int buffer_data(struct line *line, const char *buf, int len) |
100 | { | |
101 | int end, room; | |
102 | ||
2f8a2dc2 | 103 | if (line->buffer == NULL) { |
1da177e4 LT |
104 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); |
105 | if (line->buffer == NULL) { | |
2f8a2dc2 JD |
106 | printk(KERN_ERR "buffer_data - atomic allocation " |
107 | "failed\n"); | |
108 | return 0; | |
1da177e4 LT |
109 | } |
110 | line->head = line->buffer; | |
111 | line->tail = line->buffer; | |
112 | } | |
113 | ||
114 | room = write_room(line); | |
115 | len = (len > room) ? room : len; | |
116 | ||
117 | end = line->buffer + LINE_BUFSIZE - line->tail; | |
b97b77cc | 118 | |
2f8a2dc2 | 119 | if (len < end) { |
1da177e4 LT |
120 | memcpy(line->tail, buf, len); |
121 | line->tail += len; | |
d50084a2 JD |
122 | } |
123 | else { | |
b97b77cc | 124 | /* The circular buffer is wrapping */ |
1da177e4 LT |
125 | memcpy(line->tail, buf, end); |
126 | buf += end; | |
127 | memcpy(line->buffer, buf, len - end); | |
128 | line->tail = line->buffer + len - end; | |
129 | } | |
130 | ||
b97b77cc | 131 | return len; |
1da177e4 LT |
132 | } |
133 | ||
b97b77cc PBG |
134 | /* |
135 | * Flushes the ring buffer to the output channels. That is, write_chan is | |
136 | * called, passing it line->head as buffer, and an appropriate count. | |
137 | * | |
138 | * On exit, returns 1 when the buffer is empty, | |
139 | * 0 when the buffer is not empty on exit, | |
140 | * and -errno when an error occurred. | |
141 | * | |
142 | * Must be called while holding line->lock!*/ | |
1da177e4 LT |
143 | static int flush_buffer(struct line *line) |
144 | { | |
145 | int n, count; | |
146 | ||
147 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
b97b77cc | 148 | return 1; |
1da177e4 LT |
149 | |
150 | if (line->tail < line->head) { | |
b97b77cc | 151 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ |
1da177e4 | 152 | count = line->buffer + LINE_BUFSIZE - line->head; |
b97b77cc | 153 | |
1da177e4 LT |
154 | n = write_chan(&line->chan_list, line->head, count, |
155 | line->driver->write_irq); | |
156 | if (n < 0) | |
b97b77cc PBG |
157 | return n; |
158 | if (n == count) { | |
2f8a2dc2 JD |
159 | /* |
160 | * We have flushed from ->head to buffer end, now we | |
161 | * must flush only from the beginning to ->tail. | |
162 | */ | |
1da177e4 | 163 | line->head = line->buffer; |
b97b77cc | 164 | } else { |
1da177e4 | 165 | line->head += n; |
b97b77cc | 166 | return 0; |
1da177e4 LT |
167 | } |
168 | } | |
169 | ||
170 | count = line->tail - line->head; | |
d50084a2 | 171 | n = write_chan(&line->chan_list, line->head, count, |
1da177e4 | 172 | line->driver->write_irq); |
b97b77cc | 173 | |
2f8a2dc2 | 174 | if (n < 0) |
b97b77cc | 175 | return n; |
1da177e4 LT |
176 | |
177 | line->head += n; | |
b97b77cc PBG |
178 | return line->head == line->tail; |
179 | } | |
180 | ||
181 | void line_flush_buffer(struct tty_struct *tty) | |
182 | { | |
183 | struct line *line = tty->driver_data; | |
184 | unsigned long flags; | |
185 | int err; | |
186 | ||
187 | /*XXX: copied from line_write, verify if it is correct!*/ | |
2f8a2dc2 | 188 | if (tty->stopped) |
b97b77cc | 189 | return; |
b97b77cc PBG |
190 | |
191 | spin_lock_irqsave(&line->lock, flags); | |
192 | err = flush_buffer(line); | |
b97b77cc | 193 | spin_unlock_irqrestore(&line->lock, flags); |
b97b77cc PBG |
194 | } |
195 | ||
2f8a2dc2 JD |
196 | /* |
197 | * We map both ->flush_chars and ->put_char (which go in pair) onto | |
198 | * ->flush_buffer and ->write. Hope it's not that bad. | |
199 | */ | |
b97b77cc PBG |
200 | void line_flush_chars(struct tty_struct *tty) |
201 | { | |
202 | line_flush_buffer(tty); | |
203 | } | |
204 | ||
205 | void line_put_char(struct tty_struct *tty, unsigned char ch) | |
206 | { | |
207 | line_write(tty, &ch, sizeof(ch)); | |
1da177e4 LT |
208 | } |
209 | ||
210 | int line_write(struct tty_struct *tty, const unsigned char *buf, int len) | |
211 | { | |
212 | struct line *line = tty->driver_data; | |
213 | unsigned long flags; | |
c59dbcad | 214 | int n, ret = 0; |
1da177e4 | 215 | |
2f8a2dc2 | 216 | if (tty->stopped) |
b97b77cc | 217 | return 0; |
1da177e4 | 218 | |
b97b77cc | 219 | spin_lock_irqsave(&line->lock, flags); |
c59dbcad | 220 | if (line->head != line->tail) |
1da177e4 | 221 | ret = buffer_data(line, buf, len); |
c59dbcad | 222 | else { |
d50084a2 | 223 | n = write_chan(&line->chan_list, buf, len, |
1da177e4 | 224 | line->driver->write_irq); |
b97b77cc | 225 | if (n < 0) { |
1da177e4 LT |
226 | ret = n; |
227 | goto out_up; | |
228 | } | |
229 | ||
230 | len -= n; | |
231 | ret += n; | |
b97b77cc | 232 | if (len > 0) |
1da177e4 LT |
233 | ret += buffer_data(line, buf + n, len); |
234 | } | |
b97b77cc PBG |
235 | out_up: |
236 | spin_unlock_irqrestore(&line->lock, flags); | |
237 | return ret; | |
1da177e4 LT |
238 | } |
239 | ||
606d099c | 240 | void line_set_termios(struct tty_struct *tty, struct ktermios * old) |
1da177e4 LT |
241 | { |
242 | /* nothing */ | |
243 | } | |
244 | ||
5e7672ec | 245 | static const struct { |
1da177e4 LT |
246 | int cmd; |
247 | char *level; | |
248 | char *name; | |
249 | } tty_ioctls[] = { | |
250 | /* don't print these, they flood the log ... */ | |
251 | { TCGETS, NULL, "TCGETS" }, | |
2f8a2dc2 JD |
252 | { TCSETS, NULL, "TCSETS" }, |
253 | { TCSETSW, NULL, "TCSETSW" }, | |
254 | { TCFLSH, NULL, "TCFLSH" }, | |
255 | { TCSBRK, NULL, "TCSBRK" }, | |
1da177e4 LT |
256 | |
257 | /* general tty stuff */ | |
2f8a2dc2 JD |
258 | { TCSETSF, KERN_DEBUG, "TCSETSF" }, |
259 | { TCGETA, KERN_DEBUG, "TCGETA" }, | |
260 | { TIOCMGET, KERN_DEBUG, "TIOCMGET" }, | |
261 | { TCSBRKP, KERN_DEBUG, "TCSBRKP" }, | |
262 | { TIOCMSET, KERN_DEBUG, "TIOCMSET" }, | |
1da177e4 LT |
263 | |
264 | /* linux-specific ones */ | |
265 | { TIOCLINUX, KERN_INFO, "TIOCLINUX" }, | |
266 | { KDGKBMODE, KERN_INFO, "KDGKBMODE" }, | |
267 | { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" }, | |
268 | { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" }, | |
269 | }; | |
270 | ||
271 | int line_ioctl(struct tty_struct *tty, struct file * file, | |
272 | unsigned int cmd, unsigned long arg) | |
273 | { | |
274 | int ret; | |
275 | int i; | |
276 | ||
277 | ret = 0; | |
278 | switch(cmd) { | |
279 | #ifdef TIOCGETP | |
280 | case TIOCGETP: | |
281 | case TIOCSETP: | |
282 | case TIOCSETN: | |
283 | #endif | |
284 | #ifdef TIOCGETC | |
285 | case TIOCGETC: | |
286 | case TIOCSETC: | |
287 | #endif | |
288 | #ifdef TIOCGLTC | |
289 | case TIOCGLTC: | |
290 | case TIOCSLTC: | |
291 | #endif | |
292 | case TCGETS: | |
293 | case TCSETSF: | |
294 | case TCSETSW: | |
295 | case TCSETS: | |
296 | case TCGETA: | |
297 | case TCSETAF: | |
298 | case TCSETAW: | |
299 | case TCSETA: | |
300 | case TCXONC: | |
301 | case TCFLSH: | |
302 | case TIOCOUTQ: | |
303 | case TIOCINQ: | |
304 | case TIOCGLCKTRMIOS: | |
305 | case TIOCSLCKTRMIOS: | |
306 | case TIOCPKT: | |
307 | case TIOCGSOFTCAR: | |
308 | case TIOCSSOFTCAR: | |
309 | return -ENOIOCTLCMD; | |
310 | #if 0 | |
311 | case TCwhatever: | |
312 | /* do something */ | |
313 | break; | |
314 | #endif | |
315 | default: | |
316 | for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++) | |
317 | if (cmd == tty_ioctls[i].cmd) | |
318 | break; | |
2f8a2dc2 | 319 | if (i == ARRAY_SIZE(tty_ioctls)) { |
1da177e4 LT |
320 | printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n", |
321 | __FUNCTION__, tty->name, cmd); | |
322 | } | |
323 | ret = -ENOIOCTLCMD; | |
324 | break; | |
325 | } | |
b97b77cc | 326 | return ret; |
1da177e4 LT |
327 | } |
328 | ||
e4dcee80 JD |
329 | void line_throttle(struct tty_struct *tty) |
330 | { | |
331 | struct line *line = tty->driver_data; | |
332 | ||
333 | deactivate_chan(&line->chan_list, line->driver->read_irq); | |
334 | line->throttled = 1; | |
335 | } | |
336 | ||
337 | void line_unthrottle(struct tty_struct *tty) | |
338 | { | |
339 | struct line *line = tty->driver_data; | |
340 | ||
341 | line->throttled = 0; | |
342 | chan_interrupt(&line->chan_list, &line->task, tty, | |
343 | line->driver->read_irq); | |
344 | ||
2f8a2dc2 JD |
345 | /* |
346 | * Maybe there is enough stuff pending that calling the interrupt | |
e4dcee80 JD |
347 | * throttles us again. In this case, line->throttled will be 1 |
348 | * again and we shouldn't turn the interrupt back on. | |
349 | */ | |
2f8a2dc2 | 350 | if (!line->throttled) |
e4dcee80 JD |
351 | reactivate_chan(&line->chan_list, line->driver->read_irq); |
352 | } | |
353 | ||
7bea96fd | 354 | static irqreturn_t line_write_interrupt(int irq, void *data) |
1da177e4 | 355 | { |
165dc591 JD |
356 | struct chan *chan = data; |
357 | struct line *line = chan->line; | |
358 | struct tty_struct *tty = line->tty; | |
1da177e4 LT |
359 | int err; |
360 | ||
2f8a2dc2 JD |
361 | /* |
362 | * Interrupts are disabled here because we registered the interrupt with | |
363 | * IRQF_DISABLED (see line_setup_irq). | |
364 | */ | |
b97b77cc | 365 | |
ec0ac8ad | 366 | spin_lock(&line->lock); |
1da177e4 | 367 | err = flush_buffer(line); |
b97b77cc PBG |
368 | if (err == 0) { |
369 | return IRQ_NONE; | |
2f8a2dc2 | 370 | } else if (err < 0) { |
1da177e4 LT |
371 | line->head = line->buffer; |
372 | line->tail = line->buffer; | |
373 | } | |
ec0ac8ad | 374 | spin_unlock(&line->lock); |
1da177e4 | 375 | |
2f8a2dc2 | 376 | if (tty == NULL) |
b97b77cc | 377 | return IRQ_NONE; |
1da177e4 | 378 | |
b97b77cc | 379 | if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && |
1da177e4 LT |
380 | (tty->ldisc.write_wakeup != NULL)) |
381 | (tty->ldisc.write_wakeup)(tty); | |
165dc591 | 382 | |
2f8a2dc2 JD |
383 | /* |
384 | * BLOCKING mode | |
1da177e4 LT |
385 | * In blocking mode, everything sleeps on tty->write_wait. |
386 | * Sleeping in the console driver would break non-blocking | |
387 | * writes. | |
388 | */ | |
389 | ||
b97b77cc | 390 | if (waitqueue_active(&tty->write_wait)) |
1da177e4 | 391 | wake_up_interruptible(&tty->write_wait); |
b97b77cc | 392 | return IRQ_HANDLED; |
1da177e4 LT |
393 | } |
394 | ||
165dc591 | 395 | int line_setup_irq(int fd, int input, int output, struct line *line, void *data) |
1da177e4 | 396 | { |
5e7672ec | 397 | const struct line_driver *driver = line->driver; |
bd6aa650 | 398 | int err = 0, flags = IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM; |
1da177e4 | 399 | |
b97b77cc PBG |
400 | if (input) |
401 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
d50084a2 | 402 | line_interrupt, flags, |
165dc591 | 403 | driver->read_irq_name, data); |
b97b77cc PBG |
404 | if (err) |
405 | return err; | |
406 | if (output) | |
407 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
d50084a2 | 408 | line_write_interrupt, flags, |
165dc591 | 409 | driver->write_irq_name, data); |
1da177e4 | 410 | line->have_irq = 1; |
b97b77cc | 411 | return err; |
1da177e4 LT |
412 | } |
413 | ||
2f8a2dc2 JD |
414 | /* |
415 | * Normally, a driver like this can rely mostly on the tty layer | |
d79a5809 JD |
416 | * locking, particularly when it comes to the driver structure. |
417 | * However, in this case, mconsole requests can come in "from the | |
418 | * side", and race with opens and closes. | |
419 | * | |
c6256c68 JD |
420 | * mconsole config requests will want to be sure the device isn't in |
421 | * use, and get_config, open, and close will want a stable | |
422 | * configuration. The checking and modification of the configuration | |
423 | * is done under a spinlock. Checking whether the device is in use is | |
424 | * line->tty->count > 1, also under the spinlock. | |
d79a5809 | 425 | * |
c6256c68 JD |
426 | * tty->count serves to decide whether the device should be enabled or |
427 | * disabled on the host. If it's equal to 1, then we are doing the | |
428 | * first open or last close. Otherwise, open and close just return. | |
d79a5809 JD |
429 | */ |
430 | ||
1f80171e | 431 | int line_open(struct line *lines, struct tty_struct *tty) |
1da177e4 | 432 | { |
d79a5809 | 433 | struct line *line = &lines[tty->index]; |
165dc591 | 434 | int err = -ENODEV; |
1da177e4 | 435 | |
d79a5809 | 436 | spin_lock(&line->count_lock); |
2f8a2dc2 | 437 | if (!line->valid) |
d79a5809 | 438 | goto out_unlock; |
1da177e4 | 439 | |
d79a5809 | 440 | err = 0; |
2f8a2dc2 | 441 | if (tty->count > 1) |
d79a5809 JD |
442 | goto out_unlock; |
443 | ||
d79a5809 | 444 | spin_unlock(&line->count_lock); |
1f80171e | 445 | |
165dc591 JD |
446 | tty->driver_data = line; |
447 | line->tty = tty; | |
165dc591 | 448 | |
d14ad81f JD |
449 | err = enable_chan(line); |
450 | if (err) | |
451 | return err; | |
452 | ||
d79a5809 | 453 | INIT_DELAYED_WORK(&line->task, line_timer_cb); |
165dc591 | 454 | |
2f8a2dc2 | 455 | if (!line->sigio) { |
d79a5809 JD |
456 | chan_enable_winch(&line->chan_list, tty); |
457 | line->sigio = 1; | |
1da177e4 | 458 | } |
1da177e4 | 459 | |
d79a5809 JD |
460 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, |
461 | &tty->winsize.ws_col); | |
462 | ||
d79a5809 JD |
463 | return err; |
464 | ||
465 | out_unlock: | |
466 | spin_unlock(&line->count_lock); | |
b97b77cc | 467 | return err; |
1da177e4 LT |
468 | } |
469 | ||
cd2ee4a3 JD |
470 | static void unregister_winch(struct tty_struct *tty); |
471 | ||
1da177e4 LT |
472 | void line_close(struct tty_struct *tty, struct file * filp) |
473 | { | |
474 | struct line *line = tty->driver_data; | |
475 | ||
2f8a2dc2 JD |
476 | /* |
477 | * If line_open fails (and tty->driver_data is never set), | |
d79a5809 JD |
478 | * tty_open will call line_close. So just return in this case. |
479 | */ | |
2f8a2dc2 | 480 | if (line == NULL) |
d79a5809 | 481 | return; |
b97b77cc PBG |
482 | |
483 | /* We ignore the error anyway! */ | |
484 | flush_buffer(line); | |
485 | ||
d79a5809 | 486 | spin_lock(&line->count_lock); |
2f8a2dc2 | 487 | if (!line->valid) |
d79a5809 | 488 | goto out_unlock; |
cd2ee4a3 | 489 | |
2f8a2dc2 | 490 | if (tty->count > 1) |
d79a5809 JD |
491 | goto out_unlock; |
492 | ||
d79a5809 JD |
493 | spin_unlock(&line->count_lock); |
494 | ||
495 | line->tty = NULL; | |
496 | tty->driver_data = NULL; | |
497 | ||
2f8a2dc2 | 498 | if (line->sigio) { |
d79a5809 JD |
499 | unregister_winch(tty); |
500 | line->sigio = 0; | |
2f8a2dc2 | 501 | } |
cd2ee4a3 | 502 | |
d79a5809 JD |
503 | return; |
504 | ||
505 | out_unlock: | |
506 | spin_unlock(&line->count_lock); | |
1da177e4 LT |
507 | } |
508 | ||
509 | void close_lines(struct line *lines, int nlines) | |
510 | { | |
511 | int i; | |
512 | ||
513 | for(i = 0; i < nlines; i++) | |
165dc591 | 514 | close_chan(&lines[i].chan_list, 0); |
1da177e4 LT |
515 | } |
516 | ||
f28169d2 JD |
517 | static int setup_one_line(struct line *lines, int n, char *init, int init_prio, |
518 | char **error_out) | |
d79a5809 JD |
519 | { |
520 | struct line *line = &lines[n]; | |
f28169d2 | 521 | int err = -EINVAL; |
d79a5809 JD |
522 | |
523 | spin_lock(&line->count_lock); | |
524 | ||
2f8a2dc2 | 525 | if (line->tty != NULL) { |
f28169d2 | 526 | *error_out = "Device is already open"; |
d79a5809 JD |
527 | goto out; |
528 | } | |
529 | ||
2f8a2dc2 | 530 | if (line->init_pri <= init_prio) { |
d79a5809 JD |
531 | line->init_pri = init_prio; |
532 | if (!strcmp(init, "none")) | |
533 | line->valid = 0; | |
534 | else { | |
535 | line->init_str = init; | |
536 | line->valid = 1; | |
537 | } | |
538 | } | |
f28169d2 | 539 | err = 0; |
d79a5809 JD |
540 | out: |
541 | spin_unlock(&line->count_lock); | |
f28169d2 | 542 | return err; |
d79a5809 JD |
543 | } |
544 | ||
2f8a2dc2 JD |
545 | /* |
546 | * Common setup code for both startup command line and mconsole initialization. | |
4b3f686d | 547 | * @lines contains the array (of size @num) to modify; |
b97b77cc | 548 | * @init is the setup string; |
f28169d2 | 549 | * @error_out is an error string in the case of failure; |
d571cd18 | 550 | */ |
b97b77cc | 551 | |
f28169d2 JD |
552 | int line_setup(struct line *lines, unsigned int num, char *init, |
553 | char **error_out) | |
1da177e4 | 554 | { |
f28169d2 | 555 | int i, n, err; |
1da177e4 LT |
556 | char *end; |
557 | ||
2f8a2dc2 JD |
558 | if (*init == '=') { |
559 | /* | |
560 | * We said con=/ssl= instead of con#=, so we are configuring all | |
561 | * consoles at once. | |
562 | */ | |
b97b77cc | 563 | n = -1; |
d50084a2 JD |
564 | } |
565 | else { | |
1da177e4 | 566 | n = simple_strtoul(init, &end, 0); |
2f8a2dc2 | 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 | } | |
2f8a2dc2 | 579 | else if (n >= 0) { |
f28169d2 | 580 | err = setup_one_line(lines, n, init, INIT_ONE, error_out); |
2f8a2dc2 | 581 | if (err) |
f28169d2 | 582 | return err; |
d50084a2 | 583 | } |
d50084a2 | 584 | else { |
2f8a2dc2 | 585 | for(i = 0; i < num; i++) { |
f28169d2 JD |
586 | err = setup_one_line(lines, i, init, INIT_ALL, |
587 | error_out); | |
2f8a2dc2 | 588 | if (err) |
f28169d2 JD |
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 | |
2f8a2dc2 | 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); |
2f8a2dc2 | 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); |
2f8a2dc2 | 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); | |
2f8a2dc2 | 628 | if ((*end != '\0') || (end == name)) { |
1da177e4 | 629 | *error_out = "line_get_config failed to parse device number"; |
b97b77cc | 630 | return 0; |
1da177e4 LT |
631 | } |
632 | ||
2f8a2dc2 | 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); |
2f8a2dc2 | 641 | if (!line->valid) |
1da177e4 | 642 | CONFIG_CHUNK(str, size, n, "none", 1); |
2f8a2dc2 | 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; | |
2f8a2dc2 | 654 | int n; |
29d56cfe JD |
655 | |
656 | n = simple_strtoul(*str, &end, 0); | |
2f8a2dc2 JD |
657 | if ((*end != '\0') || (end == *str)) |
658 | return -1; | |
29d56cfe | 659 | |
2f8a2dc2 JD |
660 | *str = end; |
661 | *start_out = n; | |
662 | *end_out = n; | |
663 | return n; | |
29d56cfe JD |
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); |
2f8a2dc2 | 673 | if (err >= 0) |
418e55d4 JD |
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)) { | |
2f8a2dc2 JD |
699 | printk(KERN_ERR "register_lines : can't register %s driver\n", |
700 | line_driver->name); | |
1da177e4 LT |
701 | put_tty_driver(driver); |
702 | return NULL; | |
703 | } | |
704 | ||
2f8a2dc2 JD |
705 | for(i = 0; i < nlines; i++) { |
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 | ||
2f8a2dc2 | 723 | for(i = 0; i < nlines; i++) { |
1da177e4 LT |
724 | line = &lines[i]; |
725 | INIT_LIST_HEAD(&line->chan_list); | |
9010772c | 726 | |
2f8a2dc2 | 727 | if (line->init_str == NULL) |
d50084a2 JD |
728 | continue; |
729 | ||
730 | line->init_str = kstrdup(line->init_str, GFP_KERNEL); | |
2f8a2dc2 JD |
731 | if (line->init_str == NULL) |
732 | printk(KERN_ERR "lines_init - kstrdup returned NULL\n"); | |
1f80171e | 733 | |
2f8a2dc2 JD |
734 | if (parse_chan_pair(line->init_str, line, i, opts, &error)) { |
735 | printk(KERN_ERR "parse_chan_pair failed for " | |
736 | "device %d : %s\n", 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; | |
42a359e3 | 748 | unsigned long stack; |
1da177e4 LT |
749 | }; |
750 | ||
42a359e3 JD |
751 | static void free_winch(struct winch *winch, int free_irq_ok) |
752 | { | |
753 | list_del(&winch->list); | |
754 | ||
755 | if (winch->pid != -1) | |
756 | os_kill_process(winch->pid, 1); | |
757 | if (winch->fd != -1) | |
758 | os_close_file(winch->fd); | |
759 | if (winch->stack != 0) | |
760 | free_stack(winch->stack, 0); | |
761 | if (free_irq_ok) | |
762 | free_irq(WINCH_IRQ, winch); | |
763 | kfree(winch); | |
764 | } | |
765 | ||
7bea96fd | 766 | static irqreturn_t winch_interrupt(int irq, void *data) |
1da177e4 LT |
767 | { |
768 | struct winch *winch = data; | |
769 | struct tty_struct *tty; | |
770 | struct line *line; | |
771 | int err; | |
772 | char c; | |
773 | ||
2f8a2dc2 | 774 | if (winch->fd != -1) { |
1da177e4 | 775 | err = generic_read(winch->fd, &c, NULL); |
2f8a2dc2 JD |
776 | if (err < 0) { |
777 | if (err != -EAGAIN) { | |
778 | printk(KERN_ERR "winch_interrupt : " | |
779 | "read failed, errno = %d\n", -err); | |
780 | printk(KERN_ERR "fd %d is losing SIGWINCH " | |
781 | "support\n", winch->tty_fd); | |
42a359e3 | 782 | free_winch(winch, 0); |
b97b77cc | 783 | return IRQ_HANDLED; |
1da177e4 LT |
784 | } |
785 | goto out; | |
786 | } | |
787 | } | |
42a359e3 | 788 | tty = winch->tty; |
1da177e4 LT |
789 | if (tty != NULL) { |
790 | line = tty->driver_data; | |
d50084a2 | 791 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, |
1da177e4 | 792 | &tty->winsize.ws_col); |
ab521dc0 | 793 | kill_pgrp(tty->pgrp, SIGWINCH, 1); |
1da177e4 LT |
794 | } |
795 | out: | |
2f8a2dc2 | 796 | if (winch->fd != -1) |
1da177e4 | 797 | reactivate_fd(winch->fd, WINCH_IRQ); |
b97b77cc | 798 | return IRQ_HANDLED; |
1da177e4 LT |
799 | } |
800 | ||
42a359e3 JD |
801 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty, |
802 | unsigned long stack) | |
1da177e4 LT |
803 | { |
804 | struct winch *winch; | |
805 | ||
1da177e4 LT |
806 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); |
807 | if (winch == NULL) { | |
2f8a2dc2 | 808 | printk(KERN_ERR "register_winch_irq - kmalloc failed\n"); |
42a359e3 | 809 | goto cleanup; |
1da177e4 | 810 | } |
605a69ac | 811 | |
1da177e4 LT |
812 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), |
813 | .fd = fd, | |
814 | .tty_fd = tty_fd, | |
815 | .pid = pid, | |
42a359e3 JD |
816 | .tty = tty, |
817 | .stack = stack }); | |
818 | ||
819 | if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, | |
820 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, | |
821 | "winch", winch) < 0) { | |
2f8a2dc2 JD |
822 | printk(KERN_ERR "register_winch_irq - failed to register " |
823 | "IRQ\n"); | |
42a359e3 JD |
824 | goto out_free; |
825 | } | |
605a69ac PBG |
826 | |
827 | spin_lock(&winch_handler_lock); | |
1da177e4 | 828 | list_add(&winch->list, &winch_handlers); |
605a69ac PBG |
829 | spin_unlock(&winch_handler_lock); |
830 | ||
42a359e3 | 831 | return; |
e464bf2b | 832 | |
42a359e3 | 833 | out_free: |
e464bf2b | 834 | kfree(winch); |
42a359e3 JD |
835 | cleanup: |
836 | os_kill_process(pid, 1); | |
837 | os_close_file(fd); | |
838 | if (stack != 0) | |
839 | free_stack(stack, 0); | |
e464bf2b JD |
840 | } |
841 | ||
cd2ee4a3 JD |
842 | static void unregister_winch(struct tty_struct *tty) |
843 | { | |
844 | struct list_head *ele; | |
e464bf2b | 845 | struct winch *winch; |
cd2ee4a3 | 846 | |
605a69ac | 847 | spin_lock(&winch_handler_lock); |
e464bf2b | 848 | |
2f8a2dc2 | 849 | list_for_each(ele, &winch_handlers) { |
cd2ee4a3 | 850 | winch = list_entry(ele, struct winch, list); |
2f8a2dc2 | 851 | if (winch->tty == tty) { |
42a359e3 | 852 | free_winch(winch, 1); |
e464bf2b | 853 | break; |
2f8a2dc2 JD |
854 | } |
855 | } | |
605a69ac | 856 | spin_unlock(&winch_handler_lock); |
cd2ee4a3 JD |
857 | } |
858 | ||
1da177e4 LT |
859 | static void winch_cleanup(void) |
860 | { | |
e464bf2b | 861 | struct list_head *ele, *next; |
1da177e4 LT |
862 | struct winch *winch; |
863 | ||
e464bf2b JD |
864 | spin_lock(&winch_handler_lock); |
865 | ||
2f8a2dc2 | 866 | list_for_each_safe(ele, next, &winch_handlers) { |
1da177e4 | 867 | winch = list_entry(ele, struct winch, list); |
42a359e3 | 868 | free_winch(winch, 1); |
1da177e4 | 869 | } |
e464bf2b JD |
870 | |
871 | spin_unlock(&winch_handler_lock); | |
1da177e4 LT |
872 | } |
873 | __uml_exitcall(winch_cleanup); | |
874 | ||
875 | char *add_xterm_umid(char *base) | |
876 | { | |
877 | char *umid, *title; | |
878 | int len; | |
879 | ||
7eebe8a9 | 880 | umid = get_umid(); |
2f8a2dc2 | 881 | if (*umid == '\0') |
b97b77cc | 882 | return base; |
165dc591 | 883 | |
1da177e4 LT |
884 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; |
885 | title = kmalloc(len, GFP_KERNEL); | |
2f8a2dc2 JD |
886 | if (title == NULL) { |
887 | printk(KERN_ERR "Failed to allocate buffer for xterm title\n"); | |
b97b77cc | 888 | return base; |
1da177e4 LT |
889 | } |
890 | ||
891 | snprintf(title, len, "%s (%s)", base, umid); | |
b97b77cc | 892 | return title; |
1da177e4 | 893 | } |