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TOMOYO Linux Cross Reference
Linux/arch/um/drivers/chan_kern.c

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  1 /*
  2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
  3  * Licensed under the GPL
  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 /* CONFIG_NOCONFIG_CHAN */
 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 static void close_one_chan(struct chan *chan, int delay_free_irq)
175 {
176         if (!chan->opened)
177                 return;
178 
179     /* we can safely call free now - it will be marked
180      *  as free and freed once the IRQ stopped processing
181      */
182         if (chan->input && chan->enabled)
183                 um_free_irq(chan->line->driver->read_irq, chan);
184         if (chan->output && chan->enabled)
185                 um_free_irq(chan->line->driver->write_irq, chan);
186         chan->enabled = 0;
187         if (chan->ops->close != NULL)
188                 (*chan->ops->close)(chan->fd, chan->data);
189 
190         chan->opened = 0;
191         chan->fd = -1;
192 }
193 
194 void close_chan(struct line *line)
195 {
196         struct chan *chan;
197 
198         /* Close in reverse order as open in case more than one of them
199          * refers to the same device and they save and restore that device's
200          * state.  Then, the first one opened will have the original state,
201          * so it must be the last closed.
202          */
203         list_for_each_entry_reverse(chan, &line->chan_list, list) {
204                 close_one_chan(chan, 0);
205         }
206 }
207 
208 void deactivate_chan(struct chan *chan, int irq)
209 {
210         if (chan && chan->enabled)
211                 deactivate_fd(chan->fd, irq);
212 }
213 
214 void reactivate_chan(struct chan *chan, int irq)
215 {
216         if (chan && chan->enabled)
217                 reactivate_fd(chan->fd, irq);
218 }
219 
220 int write_chan(struct chan *chan, const char *buf, int len,
221                int write_irq)
222 {
223         int n, ret = 0;
224 
225         if (len == 0 || !chan || !chan->ops->write)
226                 return 0;
227 
228         n = chan->ops->write(chan->fd, buf, len, chan->data);
229         if (chan->primary) {
230                 ret = n;
231                 if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
232                         reactivate_fd(chan->fd, write_irq);
233         }
234         return ret;
235 }
236 
237 int console_write_chan(struct chan *chan, const char *buf, int len)
238 {
239         int n, ret = 0;
240 
241         if (!chan || !chan->ops->console_write)
242                 return 0;
243 
244         n = chan->ops->console_write(chan->fd, buf, len);
245         if (chan->primary)
246                 ret = n;
247         return ret;
248 }
249 
250 int console_open_chan(struct line *line, struct console *co)
251 {
252         int err;
253 
254         err = open_chan(&line->chan_list);
255         if (err)
256                 return err;
257 
258         printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
259                co->index);
260         return 0;
261 }
262 
263 int chan_window_size(struct line *line, unsigned short *rows_out,
264                       unsigned short *cols_out)
265 {
266         struct chan *chan;
267 
268         chan = line->chan_in;
269         if (chan && chan->primary) {
270                 if (chan->ops->window_size == NULL)
271                         return 0;
272                 return chan->ops->window_size(chan->fd, chan->data,
273                                               rows_out, cols_out);
274         }
275         chan = line->chan_out;
276         if (chan && chan->primary) {
277                 if (chan->ops->window_size == NULL)
278                         return 0;
279                 return chan->ops->window_size(chan->fd, chan->data,
280                                               rows_out, cols_out);
281         }
282         return 0;
283 }
284 
285 static void free_one_chan(struct chan *chan)
286 {
287         list_del(&chan->list);
288 
289         close_one_chan(chan, 0);
290 
291         if (chan->ops->free != NULL)
292                 (*chan->ops->free)(chan->data);
293 
294         if (chan->primary && chan->output)
295                 ignore_sigio_fd(chan->fd);
296         kfree(chan);
297 }
298 
299 static void free_chan(struct list_head *chans)
300 {
301         struct list_head *ele, *next;
302         struct chan *chan;
303 
304         list_for_each_safe(ele, next, chans) {
305                 chan = list_entry(ele, struct chan, list);
306                 free_one_chan(chan);
307         }
308 }
309 
310 static int one_chan_config_string(struct chan *chan, char *str, int size,
311                                   char **error_out)
312 {
313         int n = 0;
314 
315         if (chan == NULL) {
316                 CONFIG_CHUNK(str, size, n, "none", 1);
317                 return n;
318         }
319 
320         CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
321 
322         if (chan->dev == NULL) {
323                 CONFIG_CHUNK(str, size, n, "", 1);
324                 return n;
325         }
326 
327         CONFIG_CHUNK(str, size, n, ":", 0);
328         CONFIG_CHUNK(str, size, n, chan->dev, 0);
329 
330         return n;
331 }
332 
333 static int chan_pair_config_string(struct chan *in, struct chan *out,
334                                    char *str, int size, char **error_out)
335 {
336         int n;
337 
338         n = one_chan_config_string(in, str, size, error_out);
339         str += n;
340         size -= n;
341 
342         if (in == out) {
343                 CONFIG_CHUNK(str, size, n, "", 1);
344                 return n;
345         }
346 
347         CONFIG_CHUNK(str, size, n, ",", 1);
348         n = one_chan_config_string(out, str, size, error_out);
349         str += n;
350         size -= n;
351         CONFIG_CHUNK(str, size, n, "", 1);
352 
353         return n;
354 }
355 
356 int chan_config_string(struct line *line, char *str, int size,
357                        char **error_out)
358 {
359         struct chan *in = line->chan_in, *out = line->chan_out;
360 
361         if (in && !in->primary)
362                 in = NULL;
363         if (out && !out->primary)
364                 out = NULL;
365 
366         return chan_pair_config_string(in, out, str, size, error_out);
367 }
368 
369 struct chan_type {
370         char *key;
371         const struct chan_ops *ops;
372 };
373 
374 static const struct chan_type chan_table[] = {
375         { "fd", &fd_ops },
376 
377 #ifdef CONFIG_NULL_CHAN
378         { "null", &null_ops },
379 #else
380         { "null", &not_configged_ops },
381 #endif
382 
383 #ifdef CONFIG_PORT_CHAN
384         { "port", &port_ops },
385 #else
386         { "port", &not_configged_ops },
387 #endif
388 
389 #ifdef CONFIG_PTY_CHAN
390         { "pty", &pty_ops },
391         { "pts", &pts_ops },
392 #else
393         { "pty", &not_configged_ops },
394         { "pts", &not_configged_ops },
395 #endif
396 
397 #ifdef CONFIG_TTY_CHAN
398         { "tty", &tty_ops },
399 #else
400         { "tty", &not_configged_ops },
401 #endif
402 
403 #ifdef CONFIG_XTERM_CHAN
404         { "xterm", &xterm_ops },
405 #else
406         { "xterm", &not_configged_ops },
407 #endif
408 };
409 
410 static struct chan *parse_chan(struct line *line, char *str, int device,
411                                const struct chan_opts *opts, char **error_out)
412 {
413         const struct chan_type *entry;
414         const struct chan_ops *ops;
415         struct chan *chan;
416         void *data;
417         int i;
418 
419         ops = NULL;
420         data = NULL;
421         for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
422                 entry = &chan_table[i];
423                 if (!strncmp(str, entry->key, strlen(entry->key))) {
424                         ops = entry->ops;
425                         str += strlen(entry->key);
426                         break;
427                 }
428         }
429         if (ops == NULL) {
430                 *error_out = "No match for configured backends";
431                 return NULL;
432         }
433 
434         data = (*ops->init)(str, device, opts);
435         if (data == NULL) {
436                 *error_out = "Configuration failed";
437                 return NULL;
438         }
439 
440         chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
441         if (chan == NULL) {
442                 *error_out = "Memory allocation failed";
443                 return NULL;
444         }
445         *chan = ((struct chan) { .list          = LIST_HEAD_INIT(chan->list),
446                                  .free_list     =
447                                         LIST_HEAD_INIT(chan->free_list),
448                                  .line          = line,
449                                  .primary       = 1,
450                                  .input         = 0,
451                                  .output        = 0,
452                                  .opened        = 0,
453                                  .enabled       = 0,
454                                  .fd            = -1,
455                                  .ops           = ops,
456                                  .data          = data });
457         return chan;
458 }
459 
460 int parse_chan_pair(char *str, struct line *line, int device,
461                     const struct chan_opts *opts, char **error_out)
462 {
463         struct list_head *chans = &line->chan_list;
464         struct chan *new;
465         char *in, *out;
466 
467         if (!list_empty(chans)) {
468                 line->chan_in = line->chan_out = NULL;
469                 free_chan(chans);
470                 INIT_LIST_HEAD(chans);
471         }
472 
473         if (!str)
474                 return 0;
475 
476         out = strchr(str, ',');
477         if (out != NULL) {
478                 in = str;
479                 *out = '\0';
480                 out++;
481                 new = parse_chan(line, in, device, opts, error_out);
482                 if (new == NULL)
483                         return -1;
484 
485                 new->input = 1;
486                 list_add(&new->list, chans);
487                 line->chan_in = new;
488 
489                 new = parse_chan(line, out, device, opts, error_out);
490                 if (new == NULL)
491                         return -1;
492 
493                 list_add(&new->list, chans);
494                 new->output = 1;
495                 line->chan_out = new;
496         }
497         else {
498                 new = parse_chan(line, str, device, opts, error_out);
499                 if (new == NULL)
500                         return -1;
501 
502                 list_add(&new->list, chans);
503                 new->input = 1;
504                 new->output = 1;
505                 line->chan_in = line->chan_out = new;
506         }
507         return 0;
508 }
509 
510 void chan_interrupt(struct line *line, int irq)
511 {
512         struct tty_port *port = &line->port;
513         struct chan *chan = line->chan_in;
514         int err;
515         char c;
516 
517         if (!chan || !chan->ops->read)
518                 goto out;
519 
520         do {
521                 if (!tty_buffer_request_room(port, 1)) {
522                         schedule_delayed_work(&line->task, 1);
523                         goto out;
524                 }
525                 err = chan->ops->read(chan->fd, &c, chan->data);
526                 if (err > 0)
527                         tty_insert_flip_char(port, c, TTY_NORMAL);
528         } while (err > 0);
529 
530         if (err == 0)
531                 reactivate_fd(chan->fd, irq);
532         if (err == -EIO) {
533                 if (chan->primary) {
534                         tty_port_tty_hangup(&line->port, false);
535                         if (line->chan_out != chan)
536                                 close_one_chan(line->chan_out, 1);
537                 }
538                 close_one_chan(chan, 1);
539                 if (chan->primary)
540                         return;
541         }
542  out:
543         tty_flip_buffer_push(port);
544 }
545 

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