Commit | Line | Data |
---|---|---|
165dc591 | 1 | /* |
2f8a2dc2 | 2 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
37185b33 AV |
6 | #include <linux/irqreturn.h> |
7 | #include <linux/kd.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/slab.h> | |
510c72a3 | 10 | #include "chan.h" |
37185b33 AV |
11 | #include <irq_kern.h> |
12 | #include <irq_user.h> | |
13 | #include <kern_util.h> | |
14 | #include <os.h> | |
1da177e4 LT |
15 | |
16 | #define LINE_BUFSIZE 4096 | |
17 | ||
7bea96fd | 18 | static irqreturn_t line_interrupt(int irq, void *data) |
1da177e4 | 19 | { |
165dc591 JD |
20 | struct chan *chan = data; |
21 | struct line *line = chan->line; | |
6fc58845 | 22 | struct tty_struct *tty = tty_port_tty_get(&line->port); |
1da177e4 LT |
23 | |
24 | if (line) | |
6fc58845 JS |
25 | chan_interrupt(line, tty, irq); |
26 | tty_kref_put(tty); | |
1da177e4 LT |
27 | return IRQ_HANDLED; |
28 | } | |
29 | ||
2f8a2dc2 JD |
30 | /* |
31 | * Returns the free space inside the ring buffer of this line. | |
b97b77cc | 32 | * |
b60745b9 | 33 | * Should be called while holding line->lock (this does not modify data). |
b97b77cc PBG |
34 | */ |
35 | static int write_room(struct line *line) | |
1da177e4 LT |
36 | { |
37 | int n; | |
38 | ||
b97b77cc PBG |
39 | if (line->buffer == NULL) |
40 | return LINE_BUFSIZE - 1; | |
41 | ||
42 | /* This is for the case where the buffer is wrapped! */ | |
43 | n = line->head - line->tail; | |
1da177e4 | 44 | |
1da177e4 | 45 | if (n <= 0) |
acb2cf34 | 46 | n += LINE_BUFSIZE; /* The other case */ |
b97b77cc PBG |
47 | return n - 1; |
48 | } | |
49 | ||
50 | int line_write_room(struct tty_struct *tty) | |
51 | { | |
52 | struct line *line = tty->driver_data; | |
53 | unsigned long flags; | |
54 | int room; | |
55 | ||
b97b77cc PBG |
56 | spin_lock_irqsave(&line->lock, flags); |
57 | room = write_room(line); | |
58 | spin_unlock_irqrestore(&line->lock, flags); | |
59 | ||
b97b77cc | 60 | return room; |
1da177e4 LT |
61 | } |
62 | ||
b97b77cc PBG |
63 | int line_chars_in_buffer(struct tty_struct *tty) |
64 | { | |
65 | struct line *line = tty->driver_data; | |
66 | unsigned long flags; | |
67 | int ret; | |
68 | ||
69 | spin_lock_irqsave(&line->lock, flags); | |
acb2cf34 | 70 | /* write_room subtracts 1 for the needed NULL, so we readd it.*/ |
b97b77cc PBG |
71 | ret = LINE_BUFSIZE - (write_room(line) + 1); |
72 | spin_unlock_irqrestore(&line->lock, flags); | |
73 | ||
74 | return ret; | |
75 | } | |
76 | ||
77 | /* | |
78 | * This copies the content of buf into the circular buffer associated with | |
79 | * this line. | |
80 | * The return value is the number of characters actually copied, i.e. the ones | |
81 | * for which there was space: this function is not supposed to ever flush out | |
82 | * the circular buffer. | |
83 | * | |
84 | * Must be called while holding line->lock! | |
85 | */ | |
1da177e4 LT |
86 | static int buffer_data(struct line *line, const char *buf, int len) |
87 | { | |
88 | int end, room; | |
89 | ||
2f8a2dc2 | 90 | if (line->buffer == NULL) { |
1da177e4 LT |
91 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); |
92 | if (line->buffer == NULL) { | |
2f8a2dc2 JD |
93 | printk(KERN_ERR "buffer_data - atomic allocation " |
94 | "failed\n"); | |
95 | return 0; | |
1da177e4 LT |
96 | } |
97 | line->head = line->buffer; | |
98 | line->tail = line->buffer; | |
99 | } | |
100 | ||
101 | room = write_room(line); | |
102 | len = (len > room) ? room : len; | |
103 | ||
104 | end = line->buffer + LINE_BUFSIZE - line->tail; | |
b97b77cc | 105 | |
2f8a2dc2 | 106 | if (len < end) { |
1da177e4 LT |
107 | memcpy(line->tail, buf, len); |
108 | line->tail += len; | |
d50084a2 JD |
109 | } |
110 | else { | |
b97b77cc | 111 | /* The circular buffer is wrapping */ |
1da177e4 LT |
112 | memcpy(line->tail, buf, end); |
113 | buf += end; | |
114 | memcpy(line->buffer, buf, len - end); | |
115 | line->tail = line->buffer + len - end; | |
116 | } | |
117 | ||
b97b77cc | 118 | return len; |
1da177e4 LT |
119 | } |
120 | ||
b97b77cc PBG |
121 | /* |
122 | * Flushes the ring buffer to the output channels. That is, write_chan is | |
123 | * called, passing it line->head as buffer, and an appropriate count. | |
124 | * | |
125 | * On exit, returns 1 when the buffer is empty, | |
126 | * 0 when the buffer is not empty on exit, | |
127 | * and -errno when an error occurred. | |
128 | * | |
129 | * Must be called while holding line->lock!*/ | |
1da177e4 LT |
130 | static int flush_buffer(struct line *line) |
131 | { | |
132 | int n, count; | |
133 | ||
134 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
b97b77cc | 135 | return 1; |
1da177e4 LT |
136 | |
137 | if (line->tail < line->head) { | |
b97b77cc | 138 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ |
1da177e4 | 139 | count = line->buffer + LINE_BUFSIZE - line->head; |
b97b77cc | 140 | |
bed5e39c | 141 | n = write_chan(line->chan_out, line->head, count, |
1da177e4 LT |
142 | line->driver->write_irq); |
143 | if (n < 0) | |
b97b77cc PBG |
144 | return n; |
145 | if (n == count) { | |
2f8a2dc2 JD |
146 | /* |
147 | * We have flushed from ->head to buffer end, now we | |
148 | * must flush only from the beginning to ->tail. | |
149 | */ | |
1da177e4 | 150 | line->head = line->buffer; |
b97b77cc | 151 | } else { |
1da177e4 | 152 | line->head += n; |
b97b77cc | 153 | return 0; |
1da177e4 LT |
154 | } |
155 | } | |
156 | ||
157 | count = line->tail - line->head; | |
bed5e39c | 158 | n = write_chan(line->chan_out, line->head, count, |
1da177e4 | 159 | line->driver->write_irq); |
b97b77cc | 160 | |
2f8a2dc2 | 161 | if (n < 0) |
b97b77cc | 162 | return n; |
1da177e4 LT |
163 | |
164 | line->head += n; | |
b97b77cc PBG |
165 | return line->head == line->tail; |
166 | } | |
167 | ||
168 | void line_flush_buffer(struct tty_struct *tty) | |
169 | { | |
170 | struct line *line = tty->driver_data; | |
171 | unsigned long flags; | |
b97b77cc | 172 | |
b97b77cc | 173 | spin_lock_irqsave(&line->lock, flags); |
f1c93e49 | 174 | flush_buffer(line); |
b97b77cc | 175 | spin_unlock_irqrestore(&line->lock, flags); |
b97b77cc PBG |
176 | } |
177 | ||
2f8a2dc2 JD |
178 | /* |
179 | * We map both ->flush_chars and ->put_char (which go in pair) onto | |
180 | * ->flush_buffer and ->write. Hope it's not that bad. | |
181 | */ | |
b97b77cc PBG |
182 | void line_flush_chars(struct tty_struct *tty) |
183 | { | |
184 | line_flush_buffer(tty); | |
185 | } | |
186 | ||
3168cb98 | 187 | int line_put_char(struct tty_struct *tty, unsigned char ch) |
b97b77cc | 188 | { |
3168cb98 | 189 | return line_write(tty, &ch, sizeof(ch)); |
1da177e4 LT |
190 | } |
191 | ||
192 | int line_write(struct tty_struct *tty, const unsigned char *buf, int len) | |
193 | { | |
194 | struct line *line = tty->driver_data; | |
195 | unsigned long flags; | |
c59dbcad | 196 | int n, ret = 0; |
1da177e4 | 197 | |
b97b77cc | 198 | spin_lock_irqsave(&line->lock, flags); |
c59dbcad | 199 | if (line->head != line->tail) |
1da177e4 | 200 | ret = buffer_data(line, buf, len); |
c59dbcad | 201 | else { |
bed5e39c | 202 | n = write_chan(line->chan_out, buf, len, |
1da177e4 | 203 | line->driver->write_irq); |
b97b77cc | 204 | if (n < 0) { |
1da177e4 LT |
205 | ret = n; |
206 | goto out_up; | |
207 | } | |
208 | ||
209 | len -= n; | |
210 | ret += n; | |
b97b77cc | 211 | if (len > 0) |
1da177e4 LT |
212 | ret += buffer_data(line, buf + n, len); |
213 | } | |
b97b77cc PBG |
214 | out_up: |
215 | spin_unlock_irqrestore(&line->lock, flags); | |
216 | return ret; | |
1da177e4 LT |
217 | } |
218 | ||
606d099c | 219 | void line_set_termios(struct tty_struct *tty, struct ktermios * old) |
1da177e4 LT |
220 | { |
221 | /* nothing */ | |
222 | } | |
223 | ||
e4dcee80 JD |
224 | void line_throttle(struct tty_struct *tty) |
225 | { | |
226 | struct line *line = tty->driver_data; | |
227 | ||
bed5e39c | 228 | deactivate_chan(line->chan_in, line->driver->read_irq); |
e4dcee80 JD |
229 | line->throttled = 1; |
230 | } | |
231 | ||
232 | void line_unthrottle(struct tty_struct *tty) | |
233 | { | |
234 | struct line *line = tty->driver_data; | |
235 | ||
236 | line->throttled = 0; | |
0fcd7199 | 237 | chan_interrupt(line, tty, line->driver->read_irq); |
e4dcee80 | 238 | |
2f8a2dc2 JD |
239 | /* |
240 | * Maybe there is enough stuff pending that calling the interrupt | |
e4dcee80 JD |
241 | * throttles us again. In this case, line->throttled will be 1 |
242 | * again and we shouldn't turn the interrupt back on. | |
243 | */ | |
2f8a2dc2 | 244 | if (!line->throttled) |
bed5e39c | 245 | reactivate_chan(line->chan_in, line->driver->read_irq); |
e4dcee80 JD |
246 | } |
247 | ||
7bea96fd | 248 | static irqreturn_t line_write_interrupt(int irq, void *data) |
1da177e4 | 249 | { |
165dc591 JD |
250 | struct chan *chan = data; |
251 | struct line *line = chan->line; | |
6fc58845 | 252 | struct tty_struct *tty; |
1da177e4 LT |
253 | int err; |
254 | ||
2f8a2dc2 | 255 | /* |
c0b79a90 YZ |
256 | * Interrupts are disabled here because genirq keep irqs disabled when |
257 | * calling the action handler. | |
2f8a2dc2 | 258 | */ |
b97b77cc | 259 | |
ec0ac8ad | 260 | spin_lock(&line->lock); |
1da177e4 | 261 | err = flush_buffer(line); |
b97b77cc | 262 | if (err == 0) { |
199eebba | 263 | spin_unlock(&line->lock); |
b97b77cc | 264 | return IRQ_NONE; |
2f8a2dc2 | 265 | } else if (err < 0) { |
1da177e4 LT |
266 | line->head = line->buffer; |
267 | line->tail = line->buffer; | |
268 | } | |
ec0ac8ad | 269 | spin_unlock(&line->lock); |
1da177e4 | 270 | |
6fc58845 | 271 | tty = tty_port_tty_get(&line->port); |
2f8a2dc2 | 272 | if (tty == NULL) |
b97b77cc | 273 | return IRQ_NONE; |
1da177e4 | 274 | |
06ac6679 | 275 | tty_wakeup(tty); |
6fc58845 JS |
276 | tty_kref_put(tty); |
277 | ||
b97b77cc | 278 | return IRQ_HANDLED; |
1da177e4 LT |
279 | } |
280 | ||
165dc591 | 281 | int line_setup_irq(int fd, int input, int output, struct line *line, void *data) |
1da177e4 | 282 | { |
5e7672ec | 283 | const struct line_driver *driver = line->driver; |
aab94460 | 284 | int err = 0; |
1da177e4 | 285 | |
b97b77cc PBG |
286 | if (input) |
287 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
aab94460 TT |
288 | line_interrupt, IRQF_SHARED, |
289 | driver->read_irq_name, data); | |
b97b77cc PBG |
290 | if (err) |
291 | return err; | |
292 | if (output) | |
293 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
aab94460 TT |
294 | line_write_interrupt, IRQF_SHARED, |
295 | driver->write_irq_name, data); | |
b97b77cc | 296 | return err; |
1da177e4 LT |
297 | } |
298 | ||
79e0273d | 299 | static int line_activate(struct tty_port *port, struct tty_struct *tty) |
1da177e4 | 300 | { |
79e0273d RW |
301 | int ret; |
302 | struct line *line = tty->driver_data; | |
165dc591 | 303 | |
79e0273d RW |
304 | ret = enable_chan(line); |
305 | if (ret) | |
306 | return ret; | |
d14ad81f | 307 | |
2f8a2dc2 | 308 | if (!line->sigio) { |
bed5e39c | 309 | chan_enable_winch(line->chan_out, tty); |
d79a5809 | 310 | line->sigio = 1; |
1da177e4 | 311 | } |
1da177e4 | 312 | |
bed5e39c | 313 | chan_window_size(line, &tty->winsize.ws_row, |
79e0273d RW |
314 | &tty->winsize.ws_col); |
315 | ||
316 | return 0; | |
1da177e4 LT |
317 | } |
318 | ||
79e0273d RW |
319 | static const struct tty_port_operations line_port_ops = { |
320 | .activate = line_activate, | |
321 | }; | |
cd2ee4a3 | 322 | |
79e0273d | 323 | int line_open(struct tty_struct *tty, struct file *filp) |
1da177e4 LT |
324 | { |
325 | struct line *line = tty->driver_data; | |
326 | ||
79e0273d RW |
327 | return tty_port_open(&line->port, tty, filp); |
328 | } | |
b97b77cc | 329 | |
79e0273d RW |
330 | int line_install(struct tty_driver *driver, struct tty_struct *tty, |
331 | struct line *line) | |
332 | { | |
333 | int ret; | |
b97b77cc | 334 | |
79e0273d RW |
335 | ret = tty_standard_install(driver, tty); |
336 | if (ret) | |
337 | return ret; | |
cd2ee4a3 | 338 | |
79e0273d | 339 | tty->driver_data = line; |
d79a5809 | 340 | |
79e0273d RW |
341 | return 0; |
342 | } | |
343 | ||
344 | static void unregister_winch(struct tty_struct *tty); | |
d79a5809 | 345 | |
79e0273d RW |
346 | void line_cleanup(struct tty_struct *tty) |
347 | { | |
348 | struct line *line = tty->driver_data; | |
d79a5809 | 349 | |
2f8a2dc2 | 350 | if (line->sigio) { |
d79a5809 JD |
351 | unregister_winch(tty); |
352 | line->sigio = 0; | |
2f8a2dc2 | 353 | } |
79e0273d | 354 | } |
cd2ee4a3 | 355 | |
79e0273d RW |
356 | void line_close(struct tty_struct *tty, struct file * filp) |
357 | { | |
358 | struct line *line = tty->driver_data; | |
cd2ee4a3 | 359 | |
79e0273d RW |
360 | tty_port_close(&line->port, tty, filp); |
361 | } | |
362 | ||
363 | void line_hangup(struct tty_struct *tty) | |
364 | { | |
365 | struct line *line = tty->driver_data; | |
366 | ||
367 | tty_port_hangup(&line->port); | |
1da177e4 LT |
368 | } |
369 | ||
370 | void close_lines(struct line *lines, int nlines) | |
371 | { | |
372 | int i; | |
373 | ||
374 | for(i = 0; i < nlines; i++) | |
10c890c0 | 375 | close_chan(&lines[i]); |
1da177e4 LT |
376 | } |
377 | ||
04292b2c AV |
378 | int setup_one_line(struct line *lines, int n, char *init, |
379 | const struct chan_opts *opts, char **error_out) | |
d79a5809 JD |
380 | { |
381 | struct line *line = &lines[n]; | |
cfe6b7c7 | 382 | struct tty_driver *driver = line->driver->driver; |
f28169d2 | 383 | int err = -EINVAL; |
d79a5809 | 384 | |
060ed31d | 385 | if (line->port.count) { |
f28169d2 | 386 | *error_out = "Device is already open"; |
d79a5809 JD |
387 | goto out; |
388 | } | |
389 | ||
31efcebb AV |
390 | if (!strcmp(init, "none")) { |
391 | if (line->valid) { | |
392 | line->valid = 0; | |
393 | kfree(line->init_str); | |
cfe6b7c7 | 394 | tty_unregister_device(driver, n); |
31efcebb AV |
395 | parse_chan_pair(NULL, line, n, opts, error_out); |
396 | err = 0; | |
397 | } | |
398 | } else { | |
399 | char *new = kstrdup(init, GFP_KERNEL); | |
400 | if (!new) { | |
401 | *error_out = "Failed to allocate memory"; | |
402 | return -ENOMEM; | |
403 | } | |
c8e2876f | 404 | if (line->valid) { |
cfe6b7c7 | 405 | tty_unregister_device(driver, n); |
c8e2876f AV |
406 | kfree(line->init_str); |
407 | } | |
31efcebb | 408 | line->init_str = new; |
43574c1a | 409 | line->valid = 1; |
31efcebb | 410 | err = parse_chan_pair(new, line, n, opts, error_out); |
cfe6b7c7 | 411 | if (!err) { |
734cc178 JS |
412 | struct device *d = tty_port_register_device(&line->port, |
413 | driver, n, NULL); | |
cfe6b7c7 AV |
414 | if (IS_ERR(d)) { |
415 | *error_out = "Failed to register device"; | |
416 | err = PTR_ERR(d); | |
417 | parse_chan_pair(NULL, line, n, opts, error_out); | |
418 | } | |
419 | } | |
31efcebb AV |
420 | if (err) { |
421 | line->init_str = NULL; | |
422 | line->valid = 0; | |
423 | kfree(new); | |
424 | } | |
d79a5809 JD |
425 | } |
426 | out: | |
f28169d2 | 427 | return err; |
d79a5809 JD |
428 | } |
429 | ||
2f8a2dc2 JD |
430 | /* |
431 | * Common setup code for both startup command line and mconsole initialization. | |
4b3f686d | 432 | * @lines contains the array (of size @num) to modify; |
b97b77cc | 433 | * @init is the setup string; |
f28169d2 | 434 | * @error_out is an error string in the case of failure; |
d571cd18 | 435 | */ |
b97b77cc | 436 | |
43574c1a AV |
437 | int line_setup(char **conf, unsigned int num, char **def, |
438 | char *init, char *name) | |
1da177e4 | 439 | { |
43574c1a | 440 | char *error; |
1da177e4 | 441 | |
2f8a2dc2 JD |
442 | if (*init == '=') { |
443 | /* | |
444 | * We said con=/ssl= instead of con#=, so we are configuring all | |
445 | * consoles at once. | |
446 | */ | |
43574c1a AV |
447 | *def = init + 1; |
448 | } else { | |
449 | char *end; | |
450 | unsigned n = simple_strtoul(init, &end, 0); | |
451 | ||
2f8a2dc2 | 452 | if (*end != '=') { |
43574c1a AV |
453 | error = "Couldn't parse device number"; |
454 | goto out; | |
1da177e4 | 455 | } |
43574c1a AV |
456 | if (n >= num) { |
457 | error = "Device number out of range"; | |
458 | goto out; | |
f28169d2 | 459 | } |
43574c1a | 460 | conf[n] = end + 1; |
1da177e4 | 461 | } |
43574c1a AV |
462 | return 0; |
463 | ||
464 | out: | |
465 | printk(KERN_ERR "Failed to set up %s with " | |
466 | "configuration string \"%s\" : %s\n", name, init, error); | |
467 | return -EINVAL; | |
1da177e4 LT |
468 | } |
469 | ||
1f80171e | 470 | int line_config(struct line *lines, unsigned int num, char *str, |
f28169d2 | 471 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 472 | { |
fe9a6b00 | 473 | char *end; |
31efcebb | 474 | int n; |
1da177e4 | 475 | |
2f8a2dc2 | 476 | if (*str == '=') { |
f28169d2 JD |
477 | *error_out = "Can't configure all devices from mconsole"; |
478 | return -EINVAL; | |
d571cd18 JD |
479 | } |
480 | ||
fe9a6b00 AV |
481 | n = simple_strtoul(str, &end, 0); |
482 | if (*end++ != '=') { | |
483 | *error_out = "Couldn't parse device number"; | |
484 | return -EINVAL; | |
485 | } | |
486 | if (n >= num) { | |
487 | *error_out = "Device number out of range"; | |
488 | return -EINVAL; | |
489 | } | |
490 | ||
31efcebb | 491 | return setup_one_line(lines, n, end, opts, error_out); |
1da177e4 LT |
492 | } |
493 | ||
b97b77cc | 494 | int line_get_config(char *name, struct line *lines, unsigned int num, char *str, |
1da177e4 LT |
495 | int size, char **error_out) |
496 | { | |
497 | struct line *line; | |
498 | char *end; | |
499 | int dev, n = 0; | |
500 | ||
501 | dev = simple_strtoul(name, &end, 0); | |
2f8a2dc2 | 502 | if ((*end != '\0') || (end == name)) { |
1da177e4 | 503 | *error_out = "line_get_config failed to parse device number"; |
b97b77cc | 504 | return 0; |
1da177e4 LT |
505 | } |
506 | ||
2f8a2dc2 | 507 | if ((dev < 0) || (dev >= num)) { |
b97b77cc PBG |
508 | *error_out = "device number out of range"; |
509 | return 0; | |
1da177e4 LT |
510 | } |
511 | ||
512 | line = &lines[dev]; | |
513 | ||
2f8a2dc2 | 514 | if (!line->valid) |
1da177e4 | 515 | CONFIG_CHUNK(str, size, n, "none", 1); |
6fc58845 JS |
516 | else { |
517 | struct tty_struct *tty = tty_port_tty_get(&line->port); | |
518 | if (tty == NULL) { | |
519 | CONFIG_CHUNK(str, size, n, line->init_str, 1); | |
520 | } else { | |
521 | n = chan_config_string(line, str, size, error_out); | |
522 | tty_kref_put(tty); | |
523 | } | |
524 | } | |
1da177e4 | 525 | |
b97b77cc | 526 | return n; |
1da177e4 LT |
527 | } |
528 | ||
29d56cfe JD |
529 | int line_id(char **str, int *start_out, int *end_out) |
530 | { | |
531 | char *end; | |
2f8a2dc2 | 532 | int n; |
29d56cfe JD |
533 | |
534 | n = simple_strtoul(*str, &end, 0); | |
2f8a2dc2 JD |
535 | if ((*end != '\0') || (end == *str)) |
536 | return -1; | |
29d56cfe | 537 | |
2f8a2dc2 JD |
538 | *str = end; |
539 | *start_out = n; | |
540 | *end_out = n; | |
541 | return n; | |
29d56cfe JD |
542 | } |
543 | ||
f28169d2 | 544 | int line_remove(struct line *lines, unsigned int num, int n, char **error_out) |
1da177e4 | 545 | { |
da645f3b AV |
546 | if (n >= num) { |
547 | *error_out = "Device number out of range"; | |
548 | return -EINVAL; | |
549 | } | |
31efcebb | 550 | return setup_one_line(lines, n, "none", NULL, error_out); |
1da177e4 LT |
551 | } |
552 | ||
cfe6b7c7 AV |
553 | int register_lines(struct line_driver *line_driver, |
554 | const struct tty_operations *ops, | |
555 | struct line *lines, int nlines) | |
1da177e4 | 556 | { |
1da177e4 | 557 | struct tty_driver *driver = alloc_tty_driver(nlines); |
cfe6b7c7 | 558 | int err; |
04292b2c | 559 | int i; |
1da177e4 LT |
560 | |
561 | if (!driver) | |
cfe6b7c7 | 562 | return -ENOMEM; |
1da177e4 LT |
563 | |
564 | driver->driver_name = line_driver->name; | |
565 | driver->name = line_driver->device_name; | |
1da177e4 LT |
566 | driver->major = line_driver->major; |
567 | driver->minor_start = line_driver->minor_start; | |
568 | driver->type = line_driver->type; | |
569 | driver->subtype = line_driver->subtype; | |
cfe6b7c7 | 570 | driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 | 571 | driver->init_termios = tty_std_termios; |
04292b2c AV |
572 | |
573 | for (i = 0; i < nlines; i++) { | |
060ed31d | 574 | tty_port_init(&lines[i].port); |
79e0273d | 575 | lines[i].port.ops = &line_port_ops; |
04292b2c | 576 | spin_lock_init(&lines[i].lock); |
04292b2c AV |
577 | lines[i].driver = line_driver; |
578 | INIT_LIST_HEAD(&lines[i].chan_list); | |
579 | } | |
1da177e4 LT |
580 | tty_set_operations(driver, ops); |
581 | ||
cfe6b7c7 AV |
582 | err = tty_register_driver(driver); |
583 | if (err) { | |
2f8a2dc2 JD |
584 | printk(KERN_ERR "register_lines : can't register %s driver\n", |
585 | line_driver->name); | |
1da177e4 | 586 | put_tty_driver(driver); |
cfe6b7c7 | 587 | return err; |
1da177e4 LT |
588 | } |
589 | ||
cfe6b7c7 | 590 | line_driver->driver = driver; |
1da177e4 | 591 | mconsole_register_dev(&line_driver->mc); |
cfe6b7c7 | 592 | return 0; |
1da177e4 LT |
593 | } |
594 | ||
9010772c JD |
595 | static DEFINE_SPINLOCK(winch_handler_lock); |
596 | static LIST_HEAD(winch_handlers); | |
605a69ac | 597 | |
1da177e4 LT |
598 | struct winch { |
599 | struct list_head list; | |
600 | int fd; | |
601 | int tty_fd; | |
602 | int pid; | |
603 | struct tty_struct *tty; | |
42a359e3 | 604 | unsigned long stack; |
7cf3cf21 | 605 | struct work_struct work; |
1da177e4 LT |
606 | }; |
607 | ||
7cf3cf21 | 608 | static void __free_winch(struct work_struct *work) |
42a359e3 | 609 | { |
7cf3cf21 | 610 | struct winch *winch = container_of(work, struct winch, work); |
fa7a0449 | 611 | um_free_irq(WINCH_IRQ, winch); |
42a359e3 JD |
612 | |
613 | if (winch->pid != -1) | |
614 | os_kill_process(winch->pid, 1); | |
42a359e3 JD |
615 | if (winch->stack != 0) |
616 | free_stack(winch->stack, 0); | |
42a359e3 JD |
617 | kfree(winch); |
618 | } | |
619 | ||
7cf3cf21 AV |
620 | static void free_winch(struct winch *winch) |
621 | { | |
622 | int fd = winch->fd; | |
623 | winch->fd = -1; | |
624 | if (fd != -1) | |
625 | os_close_file(fd); | |
626 | list_del(&winch->list); | |
627 | __free_winch(&winch->work); | |
628 | } | |
629 | ||
7bea96fd | 630 | static irqreturn_t winch_interrupt(int irq, void *data) |
1da177e4 LT |
631 | { |
632 | struct winch *winch = data; | |
633 | struct tty_struct *tty; | |
634 | struct line *line; | |
7cf3cf21 | 635 | int fd = winch->fd; |
1da177e4 LT |
636 | int err; |
637 | char c; | |
638 | ||
7cf3cf21 AV |
639 | if (fd != -1) { |
640 | err = generic_read(fd, &c, NULL); | |
2f8a2dc2 JD |
641 | if (err < 0) { |
642 | if (err != -EAGAIN) { | |
7cf3cf21 AV |
643 | winch->fd = -1; |
644 | list_del(&winch->list); | |
645 | os_close_file(fd); | |
2f8a2dc2 JD |
646 | printk(KERN_ERR "winch_interrupt : " |
647 | "read failed, errno = %d\n", -err); | |
648 | printk(KERN_ERR "fd %d is losing SIGWINCH " | |
649 | "support\n", winch->tty_fd); | |
7cf3cf21 AV |
650 | INIT_WORK(&winch->work, __free_winch); |
651 | schedule_work(&winch->work); | |
b97b77cc | 652 | return IRQ_HANDLED; |
1da177e4 LT |
653 | } |
654 | goto out; | |
655 | } | |
656 | } | |
42a359e3 | 657 | tty = winch->tty; |
1da177e4 LT |
658 | if (tty != NULL) { |
659 | line = tty->driver_data; | |
438ee679 | 660 | if (line != NULL) { |
bed5e39c | 661 | chan_window_size(line, &tty->winsize.ws_row, |
438ee679 JD |
662 | &tty->winsize.ws_col); |
663 | kill_pgrp(tty->pgrp, SIGWINCH, 1); | |
664 | } | |
1da177e4 LT |
665 | } |
666 | out: | |
2f8a2dc2 | 667 | if (winch->fd != -1) |
1da177e4 | 668 | reactivate_fd(winch->fd, WINCH_IRQ); |
b97b77cc | 669 | return IRQ_HANDLED; |
1da177e4 LT |
670 | } |
671 | ||
42a359e3 JD |
672 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty, |
673 | unsigned long stack) | |
1da177e4 LT |
674 | { |
675 | struct winch *winch; | |
676 | ||
1da177e4 LT |
677 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); |
678 | if (winch == NULL) { | |
2f8a2dc2 | 679 | printk(KERN_ERR "register_winch_irq - kmalloc failed\n"); |
42a359e3 | 680 | goto cleanup; |
1da177e4 | 681 | } |
605a69ac | 682 | |
1da177e4 LT |
683 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), |
684 | .fd = fd, | |
685 | .tty_fd = tty_fd, | |
686 | .pid = pid, | |
42a359e3 JD |
687 | .tty = tty, |
688 | .stack = stack }); | |
689 | ||
690 | if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, | |
aab94460 | 691 | IRQF_SHARED, "winch", winch) < 0) { |
2f8a2dc2 JD |
692 | printk(KERN_ERR "register_winch_irq - failed to register " |
693 | "IRQ\n"); | |
42a359e3 JD |
694 | goto out_free; |
695 | } | |
605a69ac PBG |
696 | |
697 | spin_lock(&winch_handler_lock); | |
1da177e4 | 698 | list_add(&winch->list, &winch_handlers); |
605a69ac PBG |
699 | spin_unlock(&winch_handler_lock); |
700 | ||
42a359e3 | 701 | return; |
e464bf2b | 702 | |
42a359e3 | 703 | out_free: |
e464bf2b | 704 | kfree(winch); |
42a359e3 JD |
705 | cleanup: |
706 | os_kill_process(pid, 1); | |
707 | os_close_file(fd); | |
708 | if (stack != 0) | |
709 | free_stack(stack, 0); | |
e464bf2b JD |
710 | } |
711 | ||
cd2ee4a3 JD |
712 | static void unregister_winch(struct tty_struct *tty) |
713 | { | |
48a0b740 | 714 | struct list_head *ele, *next; |
e464bf2b | 715 | struct winch *winch; |
cd2ee4a3 | 716 | |
605a69ac | 717 | spin_lock(&winch_handler_lock); |
e464bf2b | 718 | |
48a0b740 | 719 | list_for_each_safe(ele, next, &winch_handlers) { |
cd2ee4a3 | 720 | winch = list_entry(ele, struct winch, list); |
2f8a2dc2 | 721 | if (winch->tty == tty) { |
7cf3cf21 | 722 | free_winch(winch); |
e464bf2b | 723 | break; |
2f8a2dc2 JD |
724 | } |
725 | } | |
605a69ac | 726 | spin_unlock(&winch_handler_lock); |
cd2ee4a3 JD |
727 | } |
728 | ||
1da177e4 LT |
729 | static void winch_cleanup(void) |
730 | { | |
e464bf2b | 731 | struct list_head *ele, *next; |
1da177e4 LT |
732 | struct winch *winch; |
733 | ||
e464bf2b JD |
734 | spin_lock(&winch_handler_lock); |
735 | ||
2f8a2dc2 | 736 | list_for_each_safe(ele, next, &winch_handlers) { |
1da177e4 | 737 | winch = list_entry(ele, struct winch, list); |
7cf3cf21 | 738 | free_winch(winch); |
1da177e4 | 739 | } |
e464bf2b JD |
740 | |
741 | spin_unlock(&winch_handler_lock); | |
1da177e4 LT |
742 | } |
743 | __uml_exitcall(winch_cleanup); | |
744 | ||
745 | char *add_xterm_umid(char *base) | |
746 | { | |
747 | char *umid, *title; | |
748 | int len; | |
749 | ||
7eebe8a9 | 750 | umid = get_umid(); |
2f8a2dc2 | 751 | if (*umid == '\0') |
b97b77cc | 752 | return base; |
165dc591 | 753 | |
1da177e4 LT |
754 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; |
755 | title = kmalloc(len, GFP_KERNEL); | |
2f8a2dc2 JD |
756 | if (title == NULL) { |
757 | printk(KERN_ERR "Failed to allocate buffer for xterm title\n"); | |
b97b77cc | 758 | return base; |
1da177e4 LT |
759 | } |
760 | ||
761 | snprintf(title, len, "%s (%s)", base, umid); | |
b97b77cc | 762 | return title; |
1da177e4 | 763 | } |