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Linux/arch/um/drivers/line.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4  */
  5 
  6 #include <linux/irqreturn.h>
  7 #include <linux/kd.h>
  8 #include <linux/sched/signal.h>
  9 #include <linux/slab.h>
 10 
 11 #include "chan.h"
 12 #include <irq_kern.h>
 13 #include <irq_user.h>
 14 #include <kern_util.h>
 15 #include <os.h>
 16 
 17 #define LINE_BUFSIZE 4096
 18 
 19 static irqreturn_t line_interrupt(int irq, void *data)
 20 {
 21         struct chan *chan = data;
 22         struct line *line = chan->line;
 23 
 24         if (line)
 25                 chan_interrupt(line, irq);
 26 
 27         return IRQ_HANDLED;
 28 }
 29 
 30 /*
 31  * Returns the free space inside the ring buffer of this line.
 32  *
 33  * Should be called while holding line->lock (this does not modify data).
 34  */
 35 static int write_room(struct line *line)
 36 {
 37         int n;
 38 
 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;
 44 
 45         if (n <= 0)
 46                 n += LINE_BUFSIZE; /* The other case */
 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 
 56         spin_lock_irqsave(&line->lock, flags);
 57         room = write_room(line);
 58         spin_unlock_irqrestore(&line->lock, flags);
 59 
 60         return room;
 61 }
 62 
 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);
 70         /* write_room subtracts 1 for the needed NULL, so we readd it.*/
 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  */
 86 static int buffer_data(struct line *line, const char *buf, int len)
 87 {
 88         int end, room;
 89 
 90         if (line->buffer == NULL) {
 91                 line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
 92                 if (line->buffer == NULL) {
 93                         printk(KERN_ERR "buffer_data - atomic allocation "
 94                                "failed\n");
 95                         return 0;
 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;
105 
106         if (len < end) {
107                 memcpy(line->tail, buf, len);
108                 line->tail += len;
109         }
110         else {
111                 /* The circular buffer is wrapping */
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 
118         return len;
119 }
120 
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!*/
130 static int flush_buffer(struct line *line)
131 {
132         int n, count;
133 
134         if ((line->buffer == NULL) || (line->head == line->tail))
135                 return 1;
136 
137         if (line->tail < line->head) {
138                 /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
139                 count = line->buffer + LINE_BUFSIZE - line->head;
140 
141                 n = write_chan(line->chan_out, line->head, count,
142                                line->driver->write_irq);
143                 if (n < 0)
144                         return n;
145                 if (n == count) {
146                         /*
147                          * We have flushed from ->head to buffer end, now we
148                          * must flush only from the beginning to ->tail.
149                          */
150                         line->head = line->buffer;
151                 } else {
152                         line->head += n;
153                         return 0;
154                 }
155         }
156 
157         count = line->tail - line->head;
158         n = write_chan(line->chan_out, line->head, count,
159                        line->driver->write_irq);
160 
161         if (n < 0)
162                 return n;
163 
164         line->head += n;
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;
172 
173         spin_lock_irqsave(&line->lock, flags);
174         flush_buffer(line);
175         spin_unlock_irqrestore(&line->lock, flags);
176 }
177 
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  */
182 void line_flush_chars(struct tty_struct *tty)
183 {
184         line_flush_buffer(tty);
185 }
186 
187 int line_put_char(struct tty_struct *tty, unsigned char ch)
188 {
189         return line_write(tty, &ch, sizeof(ch));
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;
196         int n, ret = 0;
197 
198         spin_lock_irqsave(&line->lock, flags);
199         if (line->head != line->tail)
200                 ret = buffer_data(line, buf, len);
201         else {
202                 n = write_chan(line->chan_out, buf, len,
203                                line->driver->write_irq);
204                 if (n < 0) {
205                         ret = n;
206                         goto out_up;
207                 }
208 
209                 len -= n;
210                 ret += n;
211                 if (len > 0)
212                         ret += buffer_data(line, buf + n, len);
213         }
214 out_up:
215         spin_unlock_irqrestore(&line->lock, flags);
216         return ret;
217 }
218 
219 void line_set_termios(struct tty_struct *tty, struct ktermios * old)
220 {
221         /* nothing */
222 }
223 
224 void line_throttle(struct tty_struct *tty)
225 {
226         struct line *line = tty->driver_data;
227 
228         deactivate_chan(line->chan_in, line->driver->read_irq);
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;
237         chan_interrupt(line, line->driver->read_irq);
238 }
239 
240 static irqreturn_t line_write_interrupt(int irq, void *data)
241 {
242         struct chan *chan = data;
243         struct line *line = chan->line;
244         int err;
245 
246         /*
247          * Interrupts are disabled here because genirq keep irqs disabled when
248          * calling the action handler.
249          */
250 
251         spin_lock(&line->lock);
252         err = flush_buffer(line);
253         if (err == 0) {
254                 spin_unlock(&line->lock);
255                 return IRQ_NONE;
256         } else if ((err < 0) && (err != -EAGAIN)) {
257                 line->head = line->buffer;
258                 line->tail = line->buffer;
259         }
260         spin_unlock(&line->lock);
261 
262         tty_port_tty_wakeup(&line->port);
263 
264         return IRQ_HANDLED;
265 }
266 
267 int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
268 {
269         const struct line_driver *driver = line->driver;
270         int err = 0;
271 
272         if (input)
273                 err = um_request_irq(driver->read_irq, fd, IRQ_READ,
274                                      line_interrupt, IRQF_SHARED,
275                                      driver->read_irq_name, data);
276         if (err)
277                 return err;
278         if (output)
279                 err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
280                                      line_write_interrupt, IRQF_SHARED,
281                                      driver->write_irq_name, data);
282         return err;
283 }
284 
285 static int line_activate(struct tty_port *port, struct tty_struct *tty)
286 {
287         int ret;
288         struct line *line = tty->driver_data;
289 
290         ret = enable_chan(line);
291         if (ret)
292                 return ret;
293 
294         if (!line->sigio) {
295                 chan_enable_winch(line->chan_out, port);
296                 line->sigio = 1;
297         }
298 
299         chan_window_size(line, &tty->winsize.ws_row,
300                 &tty->winsize.ws_col);
301 
302         return 0;
303 }
304 
305 static void unregister_winch(struct tty_struct *tty);
306 
307 static void line_destruct(struct tty_port *port)
308 {
309         struct tty_struct *tty = tty_port_tty_get(port);
310         struct line *line = tty->driver_data;
311 
312         if (line->sigio) {
313                 unregister_winch(tty);
314                 line->sigio = 0;
315         }
316 }
317 
318 static const struct tty_port_operations line_port_ops = {
319         .activate = line_activate,
320         .destruct = line_destruct,
321 };
322 
323 int line_open(struct tty_struct *tty, struct file *filp)
324 {
325         struct line *line = tty->driver_data;
326 
327         return tty_port_open(&line->port, tty, filp);
328 }
329 
330 int line_install(struct tty_driver *driver, struct tty_struct *tty,
331                  struct line *line)
332 {
333         int ret;
334 
335         ret = tty_standard_install(driver, tty);
336         if (ret)
337                 return ret;
338 
339         tty->driver_data = line;
340 
341         return 0;
342 }
343 
344 void line_close(struct tty_struct *tty, struct file * filp)
345 {
346         struct line *line = tty->driver_data;
347 
348         tty_port_close(&line->port, tty, filp);
349 }
350 
351 void line_hangup(struct tty_struct *tty)
352 {
353         struct line *line = tty->driver_data;
354 
355         tty_port_hangup(&line->port);
356 }
357 
358 void close_lines(struct line *lines, int nlines)
359 {
360         int i;
361 
362         for(i = 0; i < nlines; i++)
363                 close_chan(&lines[i]);
364 }
365 
366 int setup_one_line(struct line *lines, int n, char *init,
367                    const struct chan_opts *opts, char **error_out)
368 {
369         struct line *line = &lines[n];
370         struct tty_driver *driver = line->driver->driver;
371         int err = -EINVAL;
372 
373         if (line->port.count) {
374                 *error_out = "Device is already open";
375                 goto out;
376         }
377 
378         if (!strcmp(init, "none")) {
379                 if (line->valid) {
380                         line->valid = 0;
381                         kfree(line->init_str);
382                         tty_unregister_device(driver, n);
383                         parse_chan_pair(NULL, line, n, opts, error_out);
384                         err = 0;
385                 }
386         } else {
387                 char *new = kstrdup(init, GFP_KERNEL);
388                 if (!new) {
389                         *error_out = "Failed to allocate memory";
390                         return -ENOMEM;
391                 }
392                 if (line->valid) {
393                         tty_unregister_device(driver, n);
394                         kfree(line->init_str);
395                 }
396                 line->init_str = new;
397                 line->valid = 1;
398                 err = parse_chan_pair(new, line, n, opts, error_out);
399                 if (!err) {
400                         struct device *d = tty_port_register_device(&line->port,
401                                         driver, n, NULL);
402                         if (IS_ERR(d)) {
403                                 *error_out = "Failed to register device";
404                                 err = PTR_ERR(d);
405                                 parse_chan_pair(NULL, line, n, opts, error_out);
406                         }
407                 }
408                 if (err) {
409                         line->init_str = NULL;
410                         line->valid = 0;
411                         kfree(new);
412                 }
413         }
414 out:
415         return err;
416 }
417 
418 /*
419  * Common setup code for both startup command line and mconsole initialization.
420  * @lines contains the array (of size @num) to modify;
421  * @init is the setup string;
422  * @error_out is an error string in the case of failure;
423  */
424 
425 int line_setup(char **conf, unsigned int num, char **def,
426                char *init, char *name)
427 {
428         char *error;
429 
430         if (*init == '=') {
431                 /*
432                  * We said con=/ssl= instead of con#=, so we are configuring all
433                  * consoles at once.
434                  */
435                 *def = init + 1;
436         } else {
437                 char *end;
438                 unsigned n = simple_strtoul(init, &end, 0);
439 
440                 if (*end != '=') {
441                         error = "Couldn't parse device number";
442                         goto out;
443                 }
444                 if (n >= num) {
445                         error = "Device number out of range";
446                         goto out;
447                 }
448                 conf[n] = end + 1;
449         }
450         return 0;
451 
452 out:
453         printk(KERN_ERR "Failed to set up %s with "
454                "configuration string \"%s\" : %s\n", name, init, error);
455         return -EINVAL;
456 }
457 
458 int line_config(struct line *lines, unsigned int num, char *str,
459                 const struct chan_opts *opts, char **error_out)
460 {
461         char *end;
462         int n;
463 
464         if (*str == '=') {
465                 *error_out = "Can't configure all devices from mconsole";
466                 return -EINVAL;
467         }
468 
469         n = simple_strtoul(str, &end, 0);
470         if (*end++ != '=') {
471                 *error_out = "Couldn't parse device number";
472                 return -EINVAL;
473         }
474         if (n >= num) {
475                 *error_out = "Device number out of range";
476                 return -EINVAL;
477         }
478 
479         return setup_one_line(lines, n, end, opts, error_out);
480 }
481 
482 int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
483                     int size, char **error_out)
484 {
485         struct line *line;
486         char *end;
487         int dev, n = 0;
488 
489         dev = simple_strtoul(name, &end, 0);
490         if ((*end != '\0') || (end == name)) {
491                 *error_out = "line_get_config failed to parse device number";
492                 return 0;
493         }
494 
495         if ((dev < 0) || (dev >= num)) {
496                 *error_out = "device number out of range";
497                 return 0;
498         }
499 
500         line = &lines[dev];
501 
502         if (!line->valid)
503                 CONFIG_CHUNK(str, size, n, "none", 1);
504         else {
505                 struct tty_struct *tty = tty_port_tty_get(&line->port);
506                 if (tty == NULL) {
507                         CONFIG_CHUNK(str, size, n, line->init_str, 1);
508                 } else {
509                         n = chan_config_string(line, str, size, error_out);
510                         tty_kref_put(tty);
511                 }
512         }
513 
514         return n;
515 }
516 
517 int line_id(char **str, int *start_out, int *end_out)
518 {
519         char *end;
520         int n;
521 
522         n = simple_strtoul(*str, &end, 0);
523         if ((*end != '\0') || (end == *str))
524                 return -1;
525 
526         *str = end;
527         *start_out = n;
528         *end_out = n;
529         return n;
530 }
531 
532 int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
533 {
534         if (n >= num) {
535                 *error_out = "Device number out of range";
536                 return -EINVAL;
537         }
538         return setup_one_line(lines, n, "none", NULL, error_out);
539 }
540 
541 int register_lines(struct line_driver *line_driver,
542                    const struct tty_operations *ops,
543                    struct line *lines, int nlines)
544 {
545         struct tty_driver *driver = alloc_tty_driver(nlines);
546         int err;
547         int i;
548 
549         if (!driver)
550                 return -ENOMEM;
551 
552         driver->driver_name = line_driver->name;
553         driver->name = line_driver->device_name;
554         driver->major = line_driver->major;
555         driver->minor_start = line_driver->minor_start;
556         driver->type = line_driver->type;
557         driver->subtype = line_driver->subtype;
558         driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
559         driver->init_termios = tty_std_termios;
560         
561         for (i = 0; i < nlines; i++) {
562                 tty_port_init(&lines[i].port);
563                 lines[i].port.ops = &line_port_ops;
564                 spin_lock_init(&lines[i].lock);
565                 lines[i].driver = line_driver;
566                 INIT_LIST_HEAD(&lines[i].chan_list);
567         }
568         tty_set_operations(driver, ops);
569 
570         err = tty_register_driver(driver);
571         if (err) {
572                 printk(KERN_ERR "register_lines : can't register %s driver\n",
573                        line_driver->name);
574                 put_tty_driver(driver);
575                 for (i = 0; i < nlines; i++)
576                         tty_port_destroy(&lines[i].port);
577                 return err;
578         }
579 
580         line_driver->driver = driver;
581         mconsole_register_dev(&line_driver->mc);
582         return 0;
583 }
584 
585 static DEFINE_SPINLOCK(winch_handler_lock);
586 static LIST_HEAD(winch_handlers);
587 
588 struct winch {
589         struct list_head list;
590         int fd;
591         int tty_fd;
592         int pid;
593         struct tty_port *port;
594         unsigned long stack;
595         struct work_struct work;
596 };
597 
598 static void __free_winch(struct work_struct *work)
599 {
600         struct winch *winch = container_of(work, struct winch, work);
601         um_free_irq(WINCH_IRQ, winch);
602 
603         if (winch->pid != -1)
604                 os_kill_process(winch->pid, 1);
605         if (winch->stack != 0)
606                 free_stack(winch->stack, 0);
607         kfree(winch);
608 }
609 
610 static void free_winch(struct winch *winch)
611 {
612         int fd = winch->fd;
613         winch->fd = -1;
614         if (fd != -1)
615                 os_close_file(fd);
616         list_del(&winch->list);
617         __free_winch(&winch->work);
618 }
619 
620 static irqreturn_t winch_interrupt(int irq, void *data)
621 {
622         struct winch *winch = data;
623         struct tty_struct *tty;
624         struct line *line;
625         int fd = winch->fd;
626         int err;
627         char c;
628         struct pid *pgrp;
629 
630         if (fd != -1) {
631                 err = generic_read(fd, &c, NULL);
632                 if (err < 0) {
633                         if (err != -EAGAIN) {
634                                 winch->fd = -1;
635                                 list_del(&winch->list);
636                                 os_close_file(fd);
637                                 printk(KERN_ERR "winch_interrupt : "
638                                        "read failed, errno = %d\n", -err);
639                                 printk(KERN_ERR "fd %d is losing SIGWINCH "
640                                        "support\n", winch->tty_fd);
641                                 INIT_WORK(&winch->work, __free_winch);
642                                 schedule_work(&winch->work);
643                                 return IRQ_HANDLED;
644                         }
645                         goto out;
646                 }
647         }
648         tty = tty_port_tty_get(winch->port);
649         if (tty != NULL) {
650                 line = tty->driver_data;
651                 if (line != NULL) {
652                         chan_window_size(line, &tty->winsize.ws_row,
653                                          &tty->winsize.ws_col);
654                         pgrp = tty_get_pgrp(tty);
655                         if (pgrp)
656                                 kill_pgrp(pgrp, SIGWINCH, 1);
657                         put_pid(pgrp);
658                 }
659                 tty_kref_put(tty);
660         }
661  out:
662         return IRQ_HANDLED;
663 }
664 
665 void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
666                         unsigned long stack)
667 {
668         struct winch *winch;
669 
670         winch = kmalloc(sizeof(*winch), GFP_KERNEL);
671         if (winch == NULL) {
672                 printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
673                 goto cleanup;
674         }
675 
676         *winch = ((struct winch) { .list        = LIST_HEAD_INIT(winch->list),
677                                    .fd          = fd,
678                                    .tty_fd      = tty_fd,
679                                    .pid         = pid,
680                                    .port        = port,
681                                    .stack       = stack });
682 
683         if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
684                            IRQF_SHARED, "winch", winch) < 0) {
685                 printk(KERN_ERR "register_winch_irq - failed to register "
686                        "IRQ\n");
687                 goto out_free;
688         }
689 
690         spin_lock(&winch_handler_lock);
691         list_add(&winch->list, &winch_handlers);
692         spin_unlock(&winch_handler_lock);
693 
694         return;
695 
696  out_free:
697         kfree(winch);
698  cleanup:
699         os_kill_process(pid, 1);
700         os_close_file(fd);
701         if (stack != 0)
702                 free_stack(stack, 0);
703 }
704 
705 static void unregister_winch(struct tty_struct *tty)
706 {
707         struct list_head *ele, *next;
708         struct winch *winch;
709         struct tty_struct *wtty;
710 
711         spin_lock(&winch_handler_lock);
712 
713         list_for_each_safe(ele, next, &winch_handlers) {
714                 winch = list_entry(ele, struct winch, list);
715                 wtty = tty_port_tty_get(winch->port);
716                 if (wtty == tty) {
717                         free_winch(winch);
718                         break;
719                 }
720                 tty_kref_put(wtty);
721         }
722         spin_unlock(&winch_handler_lock);
723 }
724 
725 static void winch_cleanup(void)
726 {
727         struct list_head *ele, *next;
728         struct winch *winch;
729 
730         spin_lock(&winch_handler_lock);
731 
732         list_for_each_safe(ele, next, &winch_handlers) {
733                 winch = list_entry(ele, struct winch, list);
734                 free_winch(winch);
735         }
736 
737         spin_unlock(&winch_handler_lock);
738 }
739 __uml_exitcall(winch_cleanup);
740 
741 char *add_xterm_umid(char *base)
742 {
743         char *umid, *title;
744         int len;
745 
746         umid = get_umid();
747         if (*umid == '\0')
748                 return base;
749 
750         len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
751         title = kmalloc(len, GFP_KERNEL);
752         if (title == NULL) {
753                 printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
754                 return base;
755         }
756 
757         snprintf(title, len, "%s (%s)", base, umid);
758         return title;
759 }
760 

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