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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; | |
1da177e4 LT |
22 | |
23 | if (line) | |
2e124b4a JS |
24 | chan_interrupt(line, irq); |
25 | ||
1da177e4 LT |
26 | return IRQ_HANDLED; |
27 | } | |
28 | ||
2f8a2dc2 JD |
29 | /* |
30 | * Returns the free space inside the ring buffer of this line. | |
b97b77cc | 31 | * |
b60745b9 | 32 | * Should be called while holding line->lock (this does not modify data). |
b97b77cc PBG |
33 | */ |
34 | static int write_room(struct line *line) | |
1da177e4 LT |
35 | { |
36 | int n; | |
37 | ||
b97b77cc PBG |
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; | |
1da177e4 | 43 | |
1da177e4 | 44 | if (n <= 0) |
acb2cf34 | 45 | n += LINE_BUFSIZE; /* The other case */ |
b97b77cc PBG |
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 | ||
b97b77cc PBG |
55 | spin_lock_irqsave(&line->lock, flags); |
56 | room = write_room(line); | |
57 | spin_unlock_irqrestore(&line->lock, flags); | |
58 | ||
b97b77cc | 59 | return room; |
1da177e4 LT |
60 | } |
61 | ||
b97b77cc PBG |
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); | |
acb2cf34 | 69 | /* write_room subtracts 1 for the needed NULL, so we readd it.*/ |
b97b77cc PBG |
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 | */ | |
1da177e4 LT |
85 | static int buffer_data(struct line *line, const char *buf, int len) |
86 | { | |
87 | int end, room; | |
88 | ||
2f8a2dc2 | 89 | if (line->buffer == NULL) { |
1da177e4 LT |
90 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); |
91 | if (line->buffer == NULL) { | |
2f8a2dc2 JD |
92 | printk(KERN_ERR "buffer_data - atomic allocation " |
93 | "failed\n"); | |
94 | return 0; | |
1da177e4 LT |
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; | |
b97b77cc | 104 | |
2f8a2dc2 | 105 | if (len < end) { |
1da177e4 LT |
106 | memcpy(line->tail, buf, len); |
107 | line->tail += len; | |
d50084a2 JD |
108 | } |
109 | else { | |
b97b77cc | 110 | /* The circular buffer is wrapping */ |
1da177e4 LT |
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 | ||
b97b77cc | 117 | return len; |
1da177e4 LT |
118 | } |
119 | ||
b97b77cc PBG |
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!*/ | |
1da177e4 LT |
129 | static int flush_buffer(struct line *line) |
130 | { | |
131 | int n, count; | |
132 | ||
133 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
b97b77cc | 134 | return 1; |
1da177e4 LT |
135 | |
136 | if (line->tail < line->head) { | |
b97b77cc | 137 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ |
1da177e4 | 138 | count = line->buffer + LINE_BUFSIZE - line->head; |
b97b77cc | 139 | |
bed5e39c | 140 | n = write_chan(line->chan_out, line->head, count, |
1da177e4 LT |
141 | line->driver->write_irq); |
142 | if (n < 0) | |
b97b77cc PBG |
143 | return n; |
144 | if (n == count) { | |
2f8a2dc2 JD |
145 | /* |
146 | * We have flushed from ->head to buffer end, now we | |
147 | * must flush only from the beginning to ->tail. | |
148 | */ | |
1da177e4 | 149 | line->head = line->buffer; |
b97b77cc | 150 | } else { |
1da177e4 | 151 | line->head += n; |
b97b77cc | 152 | return 0; |
1da177e4 LT |
153 | } |
154 | } | |
155 | ||
156 | count = line->tail - line->head; | |
bed5e39c | 157 | n = write_chan(line->chan_out, line->head, count, |
1da177e4 | 158 | line->driver->write_irq); |
b97b77cc | 159 | |
2f8a2dc2 | 160 | if (n < 0) |
b97b77cc | 161 | return n; |
1da177e4 LT |
162 | |
163 | line->head += n; | |
b97b77cc PBG |
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; | |
b97b77cc | 171 | |
b97b77cc | 172 | spin_lock_irqsave(&line->lock, flags); |
f1c93e49 | 173 | flush_buffer(line); |
b97b77cc | 174 | spin_unlock_irqrestore(&line->lock, flags); |
b97b77cc PBG |
175 | } |
176 | ||
2f8a2dc2 JD |
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 | */ | |
b97b77cc PBG |
181 | void line_flush_chars(struct tty_struct *tty) |
182 | { | |
183 | line_flush_buffer(tty); | |
184 | } | |
185 | ||
3168cb98 | 186 | int line_put_char(struct tty_struct *tty, unsigned char ch) |
b97b77cc | 187 | { |
3168cb98 | 188 | return line_write(tty, &ch, sizeof(ch)); |
1da177e4 LT |
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; | |
c59dbcad | 195 | int n, ret = 0; |
1da177e4 | 196 | |
b97b77cc | 197 | spin_lock_irqsave(&line->lock, flags); |
c59dbcad | 198 | if (line->head != line->tail) |
1da177e4 | 199 | ret = buffer_data(line, buf, len); |
c59dbcad | 200 | else { |
bed5e39c | 201 | n = write_chan(line->chan_out, buf, len, |
1da177e4 | 202 | line->driver->write_irq); |
b97b77cc | 203 | if (n < 0) { |
1da177e4 LT |
204 | ret = n; |
205 | goto out_up; | |
206 | } | |
207 | ||
208 | len -= n; | |
209 | ret += n; | |
b97b77cc | 210 | if (len > 0) |
1da177e4 LT |
211 | ret += buffer_data(line, buf + n, len); |
212 | } | |
b97b77cc PBG |
213 | out_up: |
214 | spin_unlock_irqrestore(&line->lock, flags); | |
215 | return ret; | |
1da177e4 LT |
216 | } |
217 | ||
606d099c | 218 | void line_set_termios(struct tty_struct *tty, struct ktermios * old) |
1da177e4 LT |
219 | { |
220 | /* nothing */ | |
221 | } | |
222 | ||
e4dcee80 JD |
223 | void line_throttle(struct tty_struct *tty) |
224 | { | |
225 | struct line *line = tty->driver_data; | |
226 | ||
bed5e39c | 227 | deactivate_chan(line->chan_in, line->driver->read_irq); |
e4dcee80 JD |
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; | |
2e124b4a | 236 | chan_interrupt(line, line->driver->read_irq); |
e4dcee80 | 237 | |
2f8a2dc2 JD |
238 | /* |
239 | * Maybe there is enough stuff pending that calling the interrupt | |
e4dcee80 JD |
240 | * throttles us again. In this case, line->throttled will be 1 |
241 | * again and we shouldn't turn the interrupt back on. | |
242 | */ | |
2f8a2dc2 | 243 | if (!line->throttled) |
bed5e39c | 244 | reactivate_chan(line->chan_in, line->driver->read_irq); |
e4dcee80 JD |
245 | } |
246 | ||
7bea96fd | 247 | static irqreturn_t line_write_interrupt(int irq, void *data) |
1da177e4 | 248 | { |
165dc591 JD |
249 | struct chan *chan = data; |
250 | struct line *line = chan->line; | |
1da177e4 LT |
251 | int err; |
252 | ||
2f8a2dc2 | 253 | /* |
c0b79a90 YZ |
254 | * Interrupts are disabled here because genirq keep irqs disabled when |
255 | * calling the action handler. | |
2f8a2dc2 | 256 | */ |
b97b77cc | 257 | |
ec0ac8ad | 258 | spin_lock(&line->lock); |
1da177e4 | 259 | err = flush_buffer(line); |
b97b77cc | 260 | if (err == 0) { |
199eebba | 261 | spin_unlock(&line->lock); |
b97b77cc | 262 | return IRQ_NONE; |
2f8a2dc2 | 263 | } else if (err < 0) { |
1da177e4 LT |
264 | line->head = line->buffer; |
265 | line->tail = line->buffer; | |
266 | } | |
ec0ac8ad | 267 | spin_unlock(&line->lock); |
1da177e4 | 268 | |
6aad04f2 | 269 | tty_port_tty_wakeup(&line->port); |
6fc58845 | 270 | |
b97b77cc | 271 | return IRQ_HANDLED; |
1da177e4 LT |
272 | } |
273 | ||
165dc591 | 274 | int line_setup_irq(int fd, int input, int output, struct line *line, void *data) |
1da177e4 | 275 | { |
5e7672ec | 276 | const struct line_driver *driver = line->driver; |
aab94460 | 277 | int err = 0; |
1da177e4 | 278 | |
b97b77cc PBG |
279 | if (input) |
280 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
aab94460 TT |
281 | line_interrupt, IRQF_SHARED, |
282 | driver->read_irq_name, data); | |
b97b77cc PBG |
283 | if (err) |
284 | return err; | |
285 | if (output) | |
286 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
aab94460 TT |
287 | line_write_interrupt, IRQF_SHARED, |
288 | driver->write_irq_name, data); | |
b97b77cc | 289 | return err; |
1da177e4 LT |
290 | } |
291 | ||
79e0273d | 292 | static int line_activate(struct tty_port *port, struct tty_struct *tty) |
1da177e4 | 293 | { |
79e0273d RW |
294 | int ret; |
295 | struct line *line = tty->driver_data; | |
165dc591 | 296 | |
79e0273d RW |
297 | ret = enable_chan(line); |
298 | if (ret) | |
299 | return ret; | |
d14ad81f | 300 | |
2f8a2dc2 | 301 | if (!line->sigio) { |
2116bda6 | 302 | chan_enable_winch(line->chan_out, port); |
d79a5809 | 303 | line->sigio = 1; |
1da177e4 | 304 | } |
1da177e4 | 305 | |
bed5e39c | 306 | chan_window_size(line, &tty->winsize.ws_row, |
79e0273d RW |
307 | &tty->winsize.ws_col); |
308 | ||
309 | return 0; | |
1da177e4 LT |
310 | } |
311 | ||
cc4f0248 RW |
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 | ||
79e0273d RW |
325 | static const struct tty_port_operations line_port_ops = { |
326 | .activate = line_activate, | |
cc4f0248 | 327 | .destruct = line_destruct, |
79e0273d | 328 | }; |
cd2ee4a3 | 329 | |
79e0273d | 330 | int line_open(struct tty_struct *tty, struct file *filp) |
1da177e4 LT |
331 | { |
332 | struct line *line = tty->driver_data; | |
333 | ||
79e0273d RW |
334 | return tty_port_open(&line->port, tty, filp); |
335 | } | |
b97b77cc | 336 | |
79e0273d RW |
337 | int line_install(struct tty_driver *driver, struct tty_struct *tty, |
338 | struct line *line) | |
339 | { | |
340 | int ret; | |
b97b77cc | 341 | |
79e0273d RW |
342 | ret = tty_standard_install(driver, tty); |
343 | if (ret) | |
344 | return ret; | |
cd2ee4a3 | 345 | |
79e0273d | 346 | tty->driver_data = line; |
d79a5809 | 347 | |
79e0273d RW |
348 | return 0; |
349 | } | |
350 | ||
79e0273d RW |
351 | void line_close(struct tty_struct *tty, struct file * filp) |
352 | { | |
353 | struct line *line = tty->driver_data; | |
cd2ee4a3 | 354 | |
79e0273d RW |
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); | |
1da177e4 LT |
363 | } |
364 | ||
365 | void close_lines(struct line *lines, int nlines) | |
366 | { | |
367 | int i; | |
368 | ||
369 | for(i = 0; i < nlines; i++) | |
10c890c0 | 370 | close_chan(&lines[i]); |
1da177e4 LT |
371 | } |
372 | ||
04292b2c AV |
373 | int setup_one_line(struct line *lines, int n, char *init, |
374 | const struct chan_opts *opts, char **error_out) | |
d79a5809 JD |
375 | { |
376 | struct line *line = &lines[n]; | |
cfe6b7c7 | 377 | struct tty_driver *driver = line->driver->driver; |
f28169d2 | 378 | int err = -EINVAL; |
d79a5809 | 379 | |
060ed31d | 380 | if (line->port.count) { |
f28169d2 | 381 | *error_out = "Device is already open"; |
d79a5809 JD |
382 | goto out; |
383 | } | |
384 | ||
31efcebb AV |
385 | if (!strcmp(init, "none")) { |
386 | if (line->valid) { | |
387 | line->valid = 0; | |
388 | kfree(line->init_str); | |
cfe6b7c7 | 389 | tty_unregister_device(driver, n); |
31efcebb AV |
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 | } | |
c8e2876f | 399 | if (line->valid) { |
cfe6b7c7 | 400 | tty_unregister_device(driver, n); |
c8e2876f AV |
401 | kfree(line->init_str); |
402 | } | |
31efcebb | 403 | line->init_str = new; |
43574c1a | 404 | line->valid = 1; |
31efcebb | 405 | err = parse_chan_pair(new, line, n, opts, error_out); |
cfe6b7c7 | 406 | if (!err) { |
734cc178 JS |
407 | struct device *d = tty_port_register_device(&line->port, |
408 | driver, n, NULL); | |
cfe6b7c7 AV |
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 | } | |
31efcebb AV |
415 | if (err) { |
416 | line->init_str = NULL; | |
417 | line->valid = 0; | |
418 | kfree(new); | |
419 | } | |
d79a5809 JD |
420 | } |
421 | out: | |
f28169d2 | 422 | return err; |
d79a5809 JD |
423 | } |
424 | ||
2f8a2dc2 JD |
425 | /* |
426 | * Common setup code for both startup command line and mconsole initialization. | |
4b3f686d | 427 | * @lines contains the array (of size @num) to modify; |
b97b77cc | 428 | * @init is the setup string; |
f28169d2 | 429 | * @error_out is an error string in the case of failure; |
d571cd18 | 430 | */ |
b97b77cc | 431 | |
43574c1a AV |
432 | int line_setup(char **conf, unsigned int num, char **def, |
433 | char *init, char *name) | |
1da177e4 | 434 | { |
43574c1a | 435 | char *error; |
1da177e4 | 436 | |
2f8a2dc2 JD |
437 | if (*init == '=') { |
438 | /* | |
439 | * We said con=/ssl= instead of con#=, so we are configuring all | |
440 | * consoles at once. | |
441 | */ | |
43574c1a AV |
442 | *def = init + 1; |
443 | } else { | |
444 | char *end; | |
445 | unsigned n = simple_strtoul(init, &end, 0); | |
446 | ||
2f8a2dc2 | 447 | if (*end != '=') { |
43574c1a AV |
448 | error = "Couldn't parse device number"; |
449 | goto out; | |
1da177e4 | 450 | } |
43574c1a AV |
451 | if (n >= num) { |
452 | error = "Device number out of range"; | |
453 | goto out; | |
f28169d2 | 454 | } |
43574c1a | 455 | conf[n] = end + 1; |
1da177e4 | 456 | } |
43574c1a AV |
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; | |
1da177e4 LT |
463 | } |
464 | ||
1f80171e | 465 | int line_config(struct line *lines, unsigned int num, char *str, |
f28169d2 | 466 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 467 | { |
fe9a6b00 | 468 | char *end; |
31efcebb | 469 | int n; |
1da177e4 | 470 | |
2f8a2dc2 | 471 | if (*str == '=') { |
f28169d2 JD |
472 | *error_out = "Can't configure all devices from mconsole"; |
473 | return -EINVAL; | |
d571cd18 JD |
474 | } |
475 | ||
fe9a6b00 AV |
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 | ||
31efcebb | 486 | return setup_one_line(lines, n, end, opts, error_out); |
1da177e4 LT |
487 | } |
488 | ||
b97b77cc | 489 | int line_get_config(char *name, struct line *lines, unsigned int num, char *str, |
1da177e4 LT |
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); | |
2f8a2dc2 | 497 | if ((*end != '\0') || (end == name)) { |
1da177e4 | 498 | *error_out = "line_get_config failed to parse device number"; |
b97b77cc | 499 | return 0; |
1da177e4 LT |
500 | } |
501 | ||
2f8a2dc2 | 502 | if ((dev < 0) || (dev >= num)) { |
b97b77cc PBG |
503 | *error_out = "device number out of range"; |
504 | return 0; | |
1da177e4 LT |
505 | } |
506 | ||
507 | line = &lines[dev]; | |
508 | ||
2f8a2dc2 | 509 | if (!line->valid) |
1da177e4 | 510 | CONFIG_CHUNK(str, size, n, "none", 1); |
6fc58845 JS |
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 | } | |
1da177e4 | 520 | |
b97b77cc | 521 | return n; |
1da177e4 LT |
522 | } |
523 | ||
29d56cfe JD |
524 | int line_id(char **str, int *start_out, int *end_out) |
525 | { | |
526 | char *end; | |
2f8a2dc2 | 527 | int n; |
29d56cfe JD |
528 | |
529 | n = simple_strtoul(*str, &end, 0); | |
2f8a2dc2 JD |
530 | if ((*end != '\0') || (end == *str)) |
531 | return -1; | |
29d56cfe | 532 | |
2f8a2dc2 JD |
533 | *str = end; |
534 | *start_out = n; | |
535 | *end_out = n; | |
536 | return n; | |
29d56cfe JD |
537 | } |
538 | ||
f28169d2 | 539 | int line_remove(struct line *lines, unsigned int num, int n, char **error_out) |
1da177e4 | 540 | { |
da645f3b AV |
541 | if (n >= num) { |
542 | *error_out = "Device number out of range"; | |
543 | return -EINVAL; | |
544 | } | |
31efcebb | 545 | return setup_one_line(lines, n, "none", NULL, error_out); |
1da177e4 LT |
546 | } |
547 | ||
cfe6b7c7 AV |
548 | int register_lines(struct line_driver *line_driver, |
549 | const struct tty_operations *ops, | |
550 | struct line *lines, int nlines) | |
1da177e4 | 551 | { |
1da177e4 | 552 | struct tty_driver *driver = alloc_tty_driver(nlines); |
cfe6b7c7 | 553 | int err; |
04292b2c | 554 | int i; |
1da177e4 LT |
555 | |
556 | if (!driver) | |
cfe6b7c7 | 557 | return -ENOMEM; |
1da177e4 LT |
558 | |
559 | driver->driver_name = line_driver->name; | |
560 | driver->name = line_driver->device_name; | |
1da177e4 LT |
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; | |
cfe6b7c7 | 565 | driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
1da177e4 | 566 | driver->init_termios = tty_std_termios; |
04292b2c AV |
567 | |
568 | for (i = 0; i < nlines; i++) { | |
060ed31d | 569 | tty_port_init(&lines[i].port); |
79e0273d | 570 | lines[i].port.ops = &line_port_ops; |
04292b2c | 571 | spin_lock_init(&lines[i].lock); |
04292b2c AV |
572 | lines[i].driver = line_driver; |
573 | INIT_LIST_HEAD(&lines[i].chan_list); | |
574 | } | |
1da177e4 LT |
575 | tty_set_operations(driver, ops); |
576 | ||
cfe6b7c7 AV |
577 | err = tty_register_driver(driver); |
578 | if (err) { | |
2f8a2dc2 JD |
579 | printk(KERN_ERR "register_lines : can't register %s driver\n", |
580 | line_driver->name); | |
1da177e4 | 581 | put_tty_driver(driver); |
191c5f10 JS |
582 | for (i = 0; i < nlines; i++) |
583 | tty_port_destroy(&lines[i].port); | |
cfe6b7c7 | 584 | return err; |
1da177e4 LT |
585 | } |
586 | ||
cfe6b7c7 | 587 | line_driver->driver = driver; |
1da177e4 | 588 | mconsole_register_dev(&line_driver->mc); |
cfe6b7c7 | 589 | return 0; |
1da177e4 LT |
590 | } |
591 | ||
9010772c JD |
592 | static DEFINE_SPINLOCK(winch_handler_lock); |
593 | static LIST_HEAD(winch_handlers); | |
605a69ac | 594 | |
1da177e4 LT |
595 | struct winch { |
596 | struct list_head list; | |
597 | int fd; | |
598 | int tty_fd; | |
599 | int pid; | |
2116bda6 | 600 | struct tty_port *port; |
42a359e3 | 601 | unsigned long stack; |
7cf3cf21 | 602 | struct work_struct work; |
1da177e4 LT |
603 | }; |
604 | ||
7cf3cf21 | 605 | static void __free_winch(struct work_struct *work) |
42a359e3 | 606 | { |
7cf3cf21 | 607 | struct winch *winch = container_of(work, struct winch, work); |
fa7a0449 | 608 | um_free_irq(WINCH_IRQ, winch); |
42a359e3 JD |
609 | |
610 | if (winch->pid != -1) | |
611 | os_kill_process(winch->pid, 1); | |
42a359e3 JD |
612 | if (winch->stack != 0) |
613 | free_stack(winch->stack, 0); | |
42a359e3 JD |
614 | kfree(winch); |
615 | } | |
616 | ||
7cf3cf21 AV |
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 | ||
7bea96fd | 627 | static irqreturn_t winch_interrupt(int irq, void *data) |
1da177e4 LT |
628 | { |
629 | struct winch *winch = data; | |
630 | struct tty_struct *tty; | |
631 | struct line *line; | |
7cf3cf21 | 632 | int fd = winch->fd; |
1da177e4 LT |
633 | int err; |
634 | char c; | |
8a8a5510 | 635 | struct pid *pgrp; |
1da177e4 | 636 | |
7cf3cf21 AV |
637 | if (fd != -1) { |
638 | err = generic_read(fd, &c, NULL); | |
2f8a2dc2 JD |
639 | if (err < 0) { |
640 | if (err != -EAGAIN) { | |
7cf3cf21 AV |
641 | winch->fd = -1; |
642 | list_del(&winch->list); | |
643 | os_close_file(fd); | |
2f8a2dc2 JD |
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); | |
7cf3cf21 AV |
648 | INIT_WORK(&winch->work, __free_winch); |
649 | schedule_work(&winch->work); | |
b97b77cc | 650 | return IRQ_HANDLED; |
1da177e4 LT |
651 | } |
652 | goto out; | |
653 | } | |
654 | } | |
2116bda6 | 655 | tty = tty_port_tty_get(winch->port); |
1da177e4 LT |
656 | if (tty != NULL) { |
657 | line = tty->driver_data; | |
438ee679 | 658 | if (line != NULL) { |
bed5e39c | 659 | chan_window_size(line, &tty->winsize.ws_row, |
438ee679 | 660 | &tty->winsize.ws_col); |
8a8a5510 PH |
661 | pgrp = tty_get_pgrp(tty); |
662 | if (pgrp) | |
663 | kill_pgrp(pgrp, SIGWINCH, 1); | |
664 | put_pid(pgrp); | |
438ee679 | 665 | } |
2116bda6 | 666 | tty_kref_put(tty); |
1da177e4 LT |
667 | } |
668 | out: | |
2f8a2dc2 | 669 | if (winch->fd != -1) |
1da177e4 | 670 | reactivate_fd(winch->fd, WINCH_IRQ); |
b97b77cc | 671 | return IRQ_HANDLED; |
1da177e4 LT |
672 | } |
673 | ||
2116bda6 | 674 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port, |
42a359e3 | 675 | unsigned long stack) |
1da177e4 LT |
676 | { |
677 | struct winch *winch; | |
678 | ||
1da177e4 LT |
679 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); |
680 | if (winch == NULL) { | |
2f8a2dc2 | 681 | printk(KERN_ERR "register_winch_irq - kmalloc failed\n"); |
42a359e3 | 682 | goto cleanup; |
1da177e4 | 683 | } |
605a69ac | 684 | |
1da177e4 LT |
685 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), |
686 | .fd = fd, | |
687 | .tty_fd = tty_fd, | |
688 | .pid = pid, | |
2116bda6 | 689 | .port = port, |
42a359e3 JD |
690 | .stack = stack }); |
691 | ||
692 | if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, | |
aab94460 | 693 | IRQF_SHARED, "winch", winch) < 0) { |
2f8a2dc2 JD |
694 | printk(KERN_ERR "register_winch_irq - failed to register " |
695 | "IRQ\n"); | |
42a359e3 JD |
696 | goto out_free; |
697 | } | |
605a69ac PBG |
698 | |
699 | spin_lock(&winch_handler_lock); | |
1da177e4 | 700 | list_add(&winch->list, &winch_handlers); |
605a69ac PBG |
701 | spin_unlock(&winch_handler_lock); |
702 | ||
42a359e3 | 703 | return; |
e464bf2b | 704 | |
42a359e3 | 705 | out_free: |
e464bf2b | 706 | kfree(winch); |
42a359e3 JD |
707 | cleanup: |
708 | os_kill_process(pid, 1); | |
709 | os_close_file(fd); | |
710 | if (stack != 0) | |
711 | free_stack(stack, 0); | |
e464bf2b JD |
712 | } |
713 | ||
cd2ee4a3 JD |
714 | static void unregister_winch(struct tty_struct *tty) |
715 | { | |
48a0b740 | 716 | struct list_head *ele, *next; |
e464bf2b | 717 | struct winch *winch; |
2116bda6 | 718 | struct tty_struct *wtty; |
cd2ee4a3 | 719 | |
605a69ac | 720 | spin_lock(&winch_handler_lock); |
e464bf2b | 721 | |
48a0b740 | 722 | list_for_each_safe(ele, next, &winch_handlers) { |
cd2ee4a3 | 723 | winch = list_entry(ele, struct winch, list); |
2116bda6 RW |
724 | wtty = tty_port_tty_get(winch->port); |
725 | if (wtty == tty) { | |
7cf3cf21 | 726 | free_winch(winch); |
e464bf2b | 727 | break; |
2f8a2dc2 | 728 | } |
2116bda6 | 729 | tty_kref_put(wtty); |
2f8a2dc2 | 730 | } |
605a69ac | 731 | spin_unlock(&winch_handler_lock); |
cd2ee4a3 JD |
732 | } |
733 | ||
1da177e4 LT |
734 | static void winch_cleanup(void) |
735 | { | |
e464bf2b | 736 | struct list_head *ele, *next; |
1da177e4 LT |
737 | struct winch *winch; |
738 | ||
e464bf2b JD |
739 | spin_lock(&winch_handler_lock); |
740 | ||
2f8a2dc2 | 741 | list_for_each_safe(ele, next, &winch_handlers) { |
1da177e4 | 742 | winch = list_entry(ele, struct winch, list); |
7cf3cf21 | 743 | free_winch(winch); |
1da177e4 | 744 | } |
e464bf2b JD |
745 | |
746 | spin_unlock(&winch_handler_lock); | |
1da177e4 LT |
747 | } |
748 | __uml_exitcall(winch_cleanup); | |
749 | ||
750 | char *add_xterm_umid(char *base) | |
751 | { | |
752 | char *umid, *title; | |
753 | int len; | |
754 | ||
7eebe8a9 | 755 | umid = get_umid(); |
2f8a2dc2 | 756 | if (*umid == '\0') |
b97b77cc | 757 | return base; |
165dc591 | 758 | |
1da177e4 LT |
759 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; |
760 | title = kmalloc(len, GFP_KERNEL); | |
2f8a2dc2 JD |
761 | if (title == NULL) { |
762 | printk(KERN_ERR "Failed to allocate buffer for xterm title\n"); | |
b97b77cc | 763 | return base; |
1da177e4 LT |
764 | } |
765 | ||
766 | snprintf(title, len, "%s (%s)", base, umid); | |
b97b77cc | 767 | return title; |
1da177e4 | 768 | } |