This source file includes following definitions.
- not_configged_init
- not_configged_open
- not_configged_close
- not_configged_read
- not_configged_write
- not_configged_console_write
- not_configged_window_size
- not_configged_free
- open_one_chan
- open_chan
- chan_enable_winch
- line_timer_cb
- enable_chan
- free_irqs
- close_one_chan
- close_chan
- deactivate_chan
- write_chan
- console_write_chan
- console_open_chan
- chan_window_size
- free_one_chan
- free_chan
- one_chan_config_string
- chan_pair_config_string
- chan_config_string
- parse_chan
- parse_chan_pair
- chan_interrupt
1
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3
4
5
6 #include <linux/slab.h>
7 #include <linux/tty.h>
8 #include <linux/tty_flip.h>
9 #include "chan.h"
10 #include <os.h>
11 #include <irq_kern.h>
12
13 #ifdef CONFIG_NOCONFIG_CHAN
14 static void *not_configged_init(char *str, int device,
15 const struct chan_opts *opts)
16 {
17 printk(KERN_ERR "Using a channel type which is configured out of "
18 "UML\n");
19 return NULL;
20 }
21
22 static int not_configged_open(int input, int output, int primary, void *data,
23 char **dev_out)
24 {
25 printk(KERN_ERR "Using a channel type which is configured out of "
26 "UML\n");
27 return -ENODEV;
28 }
29
30 static void not_configged_close(int fd, void *data)
31 {
32 printk(KERN_ERR "Using a channel type which is configured out of "
33 "UML\n");
34 }
35
36 static int not_configged_read(int fd, char *c_out, void *data)
37 {
38 printk(KERN_ERR "Using a channel type which is configured out of "
39 "UML\n");
40 return -EIO;
41 }
42
43 static int not_configged_write(int fd, const char *buf, int len, void *data)
44 {
45 printk(KERN_ERR "Using a channel type which is configured out of "
46 "UML\n");
47 return -EIO;
48 }
49
50 static int not_configged_console_write(int fd, const char *buf, int len)
51 {
52 printk(KERN_ERR "Using a channel type which is configured out of "
53 "UML\n");
54 return -EIO;
55 }
56
57 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
58 unsigned short *cols)
59 {
60 printk(KERN_ERR "Using a channel type which is configured out of "
61 "UML\n");
62 return -ENODEV;
63 }
64
65 static void not_configged_free(void *data)
66 {
67 printk(KERN_ERR "Using a channel type which is configured out of "
68 "UML\n");
69 }
70
71 static const struct chan_ops not_configged_ops = {
72 .init = not_configged_init,
73 .open = not_configged_open,
74 .close = not_configged_close,
75 .read = not_configged_read,
76 .write = not_configged_write,
77 .console_write = not_configged_console_write,
78 .window_size = not_configged_window_size,
79 .free = not_configged_free,
80 .winch = 0,
81 };
82 #endif
83
84 static int open_one_chan(struct chan *chan)
85 {
86 int fd, err;
87
88 if (chan->opened)
89 return 0;
90
91 if (chan->ops->open == NULL)
92 fd = 0;
93 else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
94 chan->data, &chan->dev);
95 if (fd < 0)
96 return fd;
97
98 err = os_set_fd_block(fd, 0);
99 if (err) {
100 (*chan->ops->close)(fd, chan->data);
101 return err;
102 }
103
104 chan->fd = fd;
105
106 chan->opened = 1;
107 return 0;
108 }
109
110 static int open_chan(struct list_head *chans)
111 {
112 struct list_head *ele;
113 struct chan *chan;
114 int ret, err = 0;
115
116 list_for_each(ele, chans) {
117 chan = list_entry(ele, struct chan, list);
118 ret = open_one_chan(chan);
119 if (chan->primary)
120 err = ret;
121 }
122 return err;
123 }
124
125 void chan_enable_winch(struct chan *chan, struct tty_port *port)
126 {
127 if (chan && chan->primary && chan->ops->winch)
128 register_winch(chan->fd, port);
129 }
130
131 static void line_timer_cb(struct work_struct *work)
132 {
133 struct line *line = container_of(work, struct line, task.work);
134
135 if (!line->throttled)
136 chan_interrupt(line, line->driver->read_irq);
137 }
138
139 int enable_chan(struct line *line)
140 {
141 struct list_head *ele;
142 struct chan *chan;
143 int err;
144
145 INIT_DELAYED_WORK(&line->task, line_timer_cb);
146
147 list_for_each(ele, &line->chan_list) {
148 chan = list_entry(ele, struct chan, list);
149 err = open_one_chan(chan);
150 if (err) {
151 if (chan->primary)
152 goto out_close;
153
154 continue;
155 }
156
157 if (chan->enabled)
158 continue;
159 err = line_setup_irq(chan->fd, chan->input, chan->output, line,
160 chan);
161 if (err)
162 goto out_close;
163
164 chan->enabled = 1;
165 }
166
167 return 0;
168
169 out_close:
170 close_chan(line);
171 return err;
172 }
173
174
175
176
177
178
179
180 static DEFINE_SPINLOCK(irqs_to_free_lock);
181 static LIST_HEAD(irqs_to_free);
182
183 void free_irqs(void)
184 {
185 struct chan *chan;
186 LIST_HEAD(list);
187 struct list_head *ele;
188 unsigned long flags;
189
190 spin_lock_irqsave(&irqs_to_free_lock, flags);
191 list_splice_init(&irqs_to_free, &list);
192 spin_unlock_irqrestore(&irqs_to_free_lock, flags);
193
194 list_for_each(ele, &list) {
195 chan = list_entry(ele, struct chan, free_list);
196
197 if (chan->input && chan->enabled)
198 um_free_irq(chan->line->driver->read_irq, chan);
199 if (chan->output && chan->enabled)
200 um_free_irq(chan->line->driver->write_irq, chan);
201 chan->enabled = 0;
202 }
203 }
204
205 static void close_one_chan(struct chan *chan, int delay_free_irq)
206 {
207 unsigned long flags;
208
209 if (!chan->opened)
210 return;
211
212 if (delay_free_irq) {
213 spin_lock_irqsave(&irqs_to_free_lock, flags);
214 list_add(&chan->free_list, &irqs_to_free);
215 spin_unlock_irqrestore(&irqs_to_free_lock, flags);
216 } else {
217 if (chan->input && chan->enabled)
218 um_free_irq(chan->line->driver->read_irq, chan);
219 if (chan->output && chan->enabled)
220 um_free_irq(chan->line->driver->write_irq, chan);
221 chan->enabled = 0;
222 }
223 if (chan->ops->close != NULL)
224 (*chan->ops->close)(chan->fd, chan->data);
225
226 chan->opened = 0;
227 chan->fd = -1;
228 }
229
230 void close_chan(struct line *line)
231 {
232 struct chan *chan;
233
234
235
236
237
238
239 list_for_each_entry_reverse(chan, &line->chan_list, list) {
240 close_one_chan(chan, 0);
241 }
242 }
243
244 void deactivate_chan(struct chan *chan, int irq)
245 {
246 if (chan && chan->enabled)
247 deactivate_fd(chan->fd, irq);
248 }
249
250 int write_chan(struct chan *chan, const char *buf, int len,
251 int write_irq)
252 {
253 int n, ret = 0;
254
255 if (len == 0 || !chan || !chan->ops->write)
256 return 0;
257
258 n = chan->ops->write(chan->fd, buf, len, chan->data);
259 if (chan->primary) {
260 ret = n;
261 }
262 return ret;
263 }
264
265 int console_write_chan(struct chan *chan, const char *buf, int len)
266 {
267 int n, ret = 0;
268
269 if (!chan || !chan->ops->console_write)
270 return 0;
271
272 n = chan->ops->console_write(chan->fd, buf, len);
273 if (chan->primary)
274 ret = n;
275 return ret;
276 }
277
278 int console_open_chan(struct line *line, struct console *co)
279 {
280 int err;
281
282 err = open_chan(&line->chan_list);
283 if (err)
284 return err;
285
286 printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
287 co->index);
288 return 0;
289 }
290
291 int chan_window_size(struct line *line, unsigned short *rows_out,
292 unsigned short *cols_out)
293 {
294 struct chan *chan;
295
296 chan = line->chan_in;
297 if (chan && chan->primary) {
298 if (chan->ops->window_size == NULL)
299 return 0;
300 return chan->ops->window_size(chan->fd, chan->data,
301 rows_out, cols_out);
302 }
303 chan = line->chan_out;
304 if (chan && chan->primary) {
305 if (chan->ops->window_size == NULL)
306 return 0;
307 return chan->ops->window_size(chan->fd, chan->data,
308 rows_out, cols_out);
309 }
310 return 0;
311 }
312
313 static void free_one_chan(struct chan *chan)
314 {
315 list_del(&chan->list);
316
317 close_one_chan(chan, 0);
318
319 if (chan->ops->free != NULL)
320 (*chan->ops->free)(chan->data);
321
322 if (chan->primary && chan->output)
323 ignore_sigio_fd(chan->fd);
324 kfree(chan);
325 }
326
327 static void free_chan(struct list_head *chans)
328 {
329 struct list_head *ele, *next;
330 struct chan *chan;
331
332 list_for_each_safe(ele, next, chans) {
333 chan = list_entry(ele, struct chan, list);
334 free_one_chan(chan);
335 }
336 }
337
338 static int one_chan_config_string(struct chan *chan, char *str, int size,
339 char **error_out)
340 {
341 int n = 0;
342
343 if (chan == NULL) {
344 CONFIG_CHUNK(str, size, n, "none", 1);
345 return n;
346 }
347
348 CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
349
350 if (chan->dev == NULL) {
351 CONFIG_CHUNK(str, size, n, "", 1);
352 return n;
353 }
354
355 CONFIG_CHUNK(str, size, n, ":", 0);
356 CONFIG_CHUNK(str, size, n, chan->dev, 0);
357
358 return n;
359 }
360
361 static int chan_pair_config_string(struct chan *in, struct chan *out,
362 char *str, int size, char **error_out)
363 {
364 int n;
365
366 n = one_chan_config_string(in, str, size, error_out);
367 str += n;
368 size -= n;
369
370 if (in == out) {
371 CONFIG_CHUNK(str, size, n, "", 1);
372 return n;
373 }
374
375 CONFIG_CHUNK(str, size, n, ",", 1);
376 n = one_chan_config_string(out, str, size, error_out);
377 str += n;
378 size -= n;
379 CONFIG_CHUNK(str, size, n, "", 1);
380
381 return n;
382 }
383
384 int chan_config_string(struct line *line, char *str, int size,
385 char **error_out)
386 {
387 struct chan *in = line->chan_in, *out = line->chan_out;
388
389 if (in && !in->primary)
390 in = NULL;
391 if (out && !out->primary)
392 out = NULL;
393
394 return chan_pair_config_string(in, out, str, size, error_out);
395 }
396
397 struct chan_type {
398 char *key;
399 const struct chan_ops *ops;
400 };
401
402 static const struct chan_type chan_table[] = {
403 { "fd", &fd_ops },
404
405 #ifdef CONFIG_NULL_CHAN
406 { "null", &null_ops },
407 #else
408 { "null", ¬_configged_ops },
409 #endif
410
411 #ifdef CONFIG_PORT_CHAN
412 { "port", &port_ops },
413 #else
414 { "port", ¬_configged_ops },
415 #endif
416
417 #ifdef CONFIG_PTY_CHAN
418 { "pty", &pty_ops },
419 { "pts", &pts_ops },
420 #else
421 { "pty", ¬_configged_ops },
422 { "pts", ¬_configged_ops },
423 #endif
424
425 #ifdef CONFIG_TTY_CHAN
426 { "tty", &tty_ops },
427 #else
428 { "tty", ¬_configged_ops },
429 #endif
430
431 #ifdef CONFIG_XTERM_CHAN
432 { "xterm", &xterm_ops },
433 #else
434 { "xterm", ¬_configged_ops },
435 #endif
436 };
437
438 static struct chan *parse_chan(struct line *line, char *str, int device,
439 const struct chan_opts *opts, char **error_out)
440 {
441 const struct chan_type *entry;
442 const struct chan_ops *ops;
443 struct chan *chan;
444 void *data;
445 int i;
446
447 ops = NULL;
448 data = NULL;
449 for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
450 entry = &chan_table[i];
451 if (!strncmp(str, entry->key, strlen(entry->key))) {
452 ops = entry->ops;
453 str += strlen(entry->key);
454 break;
455 }
456 }
457 if (ops == NULL) {
458 *error_out = "No match for configured backends";
459 return NULL;
460 }
461
462 data = (*ops->init)(str, device, opts);
463 if (data == NULL) {
464 *error_out = "Configuration failed";
465 return NULL;
466 }
467
468 chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
469 if (chan == NULL) {
470 *error_out = "Memory allocation failed";
471 return NULL;
472 }
473 *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
474 .free_list =
475 LIST_HEAD_INIT(chan->free_list),
476 .line = line,
477 .primary = 1,
478 .input = 0,
479 .output = 0,
480 .opened = 0,
481 .enabled = 0,
482 .fd = -1,
483 .ops = ops,
484 .data = data });
485 return chan;
486 }
487
488 int parse_chan_pair(char *str, struct line *line, int device,
489 const struct chan_opts *opts, char **error_out)
490 {
491 struct list_head *chans = &line->chan_list;
492 struct chan *new;
493 char *in, *out;
494
495 if (!list_empty(chans)) {
496 line->chan_in = line->chan_out = NULL;
497 free_chan(chans);
498 INIT_LIST_HEAD(chans);
499 }
500
501 if (!str)
502 return 0;
503
504 out = strchr(str, ',');
505 if (out != NULL) {
506 in = str;
507 *out = '\0';
508 out++;
509 new = parse_chan(line, in, device, opts, error_out);
510 if (new == NULL)
511 return -1;
512
513 new->input = 1;
514 list_add(&new->list, chans);
515 line->chan_in = new;
516
517 new = parse_chan(line, out, device, opts, error_out);
518 if (new == NULL)
519 return -1;
520
521 list_add(&new->list, chans);
522 new->output = 1;
523 line->chan_out = new;
524 }
525 else {
526 new = parse_chan(line, str, device, opts, error_out);
527 if (new == NULL)
528 return -1;
529
530 list_add(&new->list, chans);
531 new->input = 1;
532 new->output = 1;
533 line->chan_in = line->chan_out = new;
534 }
535 return 0;
536 }
537
538 void chan_interrupt(struct line *line, int irq)
539 {
540 struct tty_port *port = &line->port;
541 struct chan *chan = line->chan_in;
542 int err;
543 char c;
544
545 if (!chan || !chan->ops->read)
546 goto out;
547
548 do {
549 if (!tty_buffer_request_room(port, 1)) {
550 schedule_delayed_work(&line->task, 1);
551 goto out;
552 }
553 err = chan->ops->read(chan->fd, &c, chan->data);
554 if (err > 0)
555 tty_insert_flip_char(port, c, TTY_NORMAL);
556 } while (err > 0);
557
558 if (err == -EIO) {
559 if (chan->primary) {
560 tty_port_tty_hangup(&line->port, false);
561 if (line->chan_out != chan)
562 close_one_chan(line->chan_out, 1);
563 }
564 close_one_chan(chan, 1);
565 if (chan->primary)
566 return;
567 }
568 out:
569 tty_flip_buffer_push(port);
570 }