2 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/sched.h"
7 #include "linux/slab.h"
8 #include "linux/list.h"
10 #include "linux/interrupt.h"
11 #include "asm/uaccess.h"
12 #include "chan_kern.h"
16 #include "kern_util.h"
20 #define LINE_BUFSIZE 4096
22 static irqreturn_t line_interrupt(int irq, void *data)
24 struct chan *chan = data;
25 struct line *line = chan->line;
26 struct tty_struct *tty = line->tty;
29 chan_interrupt(&line->chan_list, &line->task, tty, irq);
33 static void line_timer_cb(struct work_struct *work)
35 struct line *line = container_of(work, struct line, task.work);
38 chan_interrupt(&line->chan_list, &line->task, line->tty,
39 line->driver->read_irq);
42 /* Returns the free space inside the ring buffer of this line.
44 * Should be called while holding line->lock (this does not modify datas).
46 static int write_room(struct line *line)
50 if (line->buffer == NULL)
51 return LINE_BUFSIZE - 1;
53 /* This is for the case where the buffer is wrapped! */
54 n = line->head - line->tail;
57 n = LINE_BUFSIZE + n; /* The other case */
61 int line_write_room(struct tty_struct *tty)
63 struct line *line = tty->driver_data;
70 spin_lock_irqsave(&line->lock, flags);
71 room = write_room(line);
72 spin_unlock_irqrestore(&line->lock, flags);
74 /*XXX: Warning to remove */
76 printk(KERN_DEBUG "%s: %s: no room left in buffer\n",
77 __FUNCTION__,tty->name);
81 int line_chars_in_buffer(struct tty_struct *tty)
83 struct line *line = tty->driver_data;
87 spin_lock_irqsave(&line->lock, flags);
89 /*write_room subtracts 1 for the needed NULL, so we readd it.*/
90 ret = LINE_BUFSIZE - (write_room(line) + 1);
91 spin_unlock_irqrestore(&line->lock, flags);
97 * This copies the content of buf into the circular buffer associated with
99 * The return value is the number of characters actually copied, i.e. the ones
100 * for which there was space: this function is not supposed to ever flush out
101 * the circular buffer.
103 * Must be called while holding line->lock!
105 static int buffer_data(struct line *line, const char *buf, int len)
109 if(line->buffer == NULL){
110 line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
111 if (line->buffer == NULL) {
112 printk("buffer_data - atomic allocation failed\n");
115 line->head = line->buffer;
116 line->tail = line->buffer;
119 room = write_room(line);
120 len = (len > room) ? room : len;
122 end = line->buffer + LINE_BUFSIZE - line->tail;
125 memcpy(line->tail, buf, len);
129 /* The circular buffer is wrapping */
130 memcpy(line->tail, buf, end);
132 memcpy(line->buffer, buf, len - end);
133 line->tail = line->buffer + len - end;
140 * Flushes the ring buffer to the output channels. That is, write_chan is
141 * called, passing it line->head as buffer, and an appropriate count.
143 * On exit, returns 1 when the buffer is empty,
144 * 0 when the buffer is not empty on exit,
145 * and -errno when an error occurred.
147 * Must be called while holding line->lock!*/
148 static int flush_buffer(struct line *line)
152 if ((line->buffer == NULL) || (line->head == line->tail))
155 if (line->tail < line->head) {
156 /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
157 count = line->buffer + LINE_BUFSIZE - line->head;
159 n = write_chan(&line->chan_list, line->head, count,
160 line->driver->write_irq);
164 /* We have flushed from ->head to buffer end, now we
165 * must flush only from the beginning to ->tail.*/
166 line->head = line->buffer;
173 count = line->tail - line->head;
174 n = write_chan(&line->chan_list, line->head, count,
175 line->driver->write_irq);
181 return line->head == line->tail;
184 void line_flush_buffer(struct tty_struct *tty)
186 struct line *line = tty->driver_data;
190 /*XXX: copied from line_write, verify if it is correct!*/
194 spin_lock_irqsave(&line->lock, flags);
195 err = flush_buffer(line);
198 spin_unlock_irqrestore(&line->lock, flags);
202 /* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer
203 * and ->write. Hope it's not that bad.*/
204 void line_flush_chars(struct tty_struct *tty)
206 line_flush_buffer(tty);
209 void line_put_char(struct tty_struct *tty, unsigned char ch)
211 line_write(tty, &ch, sizeof(ch));
214 int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
216 struct line *line = tty->driver_data;
223 spin_lock_irqsave(&line->lock, flags);
224 if (line->head != line->tail) {
225 ret = buffer_data(line, buf, len);
226 err = flush_buffer(line);
227 if (err <= 0 && (err != -EAGAIN || !ret))
230 n = write_chan(&line->chan_list, buf, len,
231 line->driver->write_irq);
240 ret += buffer_data(line, buf + n, len);
243 spin_unlock_irqrestore(&line->lock, flags);
247 void line_set_termios(struct tty_struct *tty, struct ktermios * old)
252 static const struct {
257 /* don't print these, they flood the log ... */
258 { TCGETS, NULL, "TCGETS" },
259 { TCSETS, NULL, "TCSETS" },
260 { TCSETSW, NULL, "TCSETSW" },
261 { TCFLSH, NULL, "TCFLSH" },
262 { TCSBRK, NULL, "TCSBRK" },
264 /* general tty stuff */
265 { TCSETSF, KERN_DEBUG, "TCSETSF" },
266 { TCGETA, KERN_DEBUG, "TCGETA" },
267 { TIOCMGET, KERN_DEBUG, "TIOCMGET" },
268 { TCSBRKP, KERN_DEBUG, "TCSBRKP" },
269 { TIOCMSET, KERN_DEBUG, "TIOCMSET" },
271 /* linux-specific ones */
272 { TIOCLINUX, KERN_INFO, "TIOCLINUX" },
273 { KDGKBMODE, KERN_INFO, "KDGKBMODE" },
274 { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" },
275 { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" },
278 int line_ioctl(struct tty_struct *tty, struct file * file,
279 unsigned int cmd, unsigned long arg)
323 for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
324 if (cmd == tty_ioctls[i].cmd)
326 if (i < ARRAY_SIZE(tty_ioctls)) {
327 if (NULL != tty_ioctls[i].level)
328 printk("%s%s: %s: ioctl %s called\n",
329 tty_ioctls[i].level, __FUNCTION__,
330 tty->name, tty_ioctls[i].name);
332 printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
333 __FUNCTION__, tty->name, cmd);
341 void line_throttle(struct tty_struct *tty)
343 struct line *line = tty->driver_data;
345 deactivate_chan(&line->chan_list, line->driver->read_irq);
349 void line_unthrottle(struct tty_struct *tty)
351 struct line *line = tty->driver_data;
354 chan_interrupt(&line->chan_list, &line->task, tty,
355 line->driver->read_irq);
357 /* Maybe there is enough stuff pending that calling the interrupt
358 * throttles us again. In this case, line->throttled will be 1
359 * again and we shouldn't turn the interrupt back on.
362 reactivate_chan(&line->chan_list, line->driver->read_irq);
365 static irqreturn_t line_write_interrupt(int irq, void *data)
367 struct chan *chan = data;
368 struct line *line = chan->line;
369 struct tty_struct *tty = line->tty;
372 /* Interrupts are disabled here because we registered the interrupt with
373 * IRQF_DISABLED (see line_setup_irq).*/
375 spin_lock(&line->lock);
376 err = flush_buffer(line);
380 line->head = line->buffer;
381 line->tail = line->buffer;
383 spin_unlock(&line->lock);
388 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
389 (tty->ldisc.write_wakeup != NULL))
390 (tty->ldisc.write_wakeup)(tty);
393 * In blocking mode, everything sleeps on tty->write_wait.
394 * Sleeping in the console driver would break non-blocking
398 if (waitqueue_active(&tty->write_wait))
399 wake_up_interruptible(&tty->write_wait);
403 int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
405 const struct line_driver *driver = line->driver;
406 int err = 0, flags = IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM;
409 err = um_request_irq(driver->read_irq, fd, IRQ_READ,
410 line_interrupt, flags,
411 driver->read_irq_name, data);
415 err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
416 line_write_interrupt, flags,
417 driver->write_irq_name, data);
422 /* Normally, a driver like this can rely mostly on the tty layer
423 * locking, particularly when it comes to the driver structure.
424 * However, in this case, mconsole requests can come in "from the
425 * side", and race with opens and closes.
427 * mconsole config requests will want to be sure the device isn't in
428 * use, and get_config, open, and close will want a stable
429 * configuration. The checking and modification of the configuration
430 * is done under a spinlock. Checking whether the device is in use is
431 * line->tty->count > 1, also under the spinlock.
433 * tty->count serves to decide whether the device should be enabled or
434 * disabled on the host. If it's equal to 1, then we are doing the
435 * first open or last close. Otherwise, open and close just return.
438 int line_open(struct line *lines, struct tty_struct *tty)
440 struct line *line = &lines[tty->index];
443 spin_lock(&line->count_lock);
451 spin_unlock(&line->count_lock);
453 tty->driver_data = line;
457 INIT_DELAYED_WORK(&line->task, line_timer_cb);
460 chan_enable_winch(&line->chan_list, tty);
464 chan_window_size(&line->chan_list, &tty->winsize.ws_row,
465 &tty->winsize.ws_col);
470 spin_unlock(&line->count_lock);
474 static void unregister_winch(struct tty_struct *tty);
476 void line_close(struct tty_struct *tty, struct file * filp)
478 struct line *line = tty->driver_data;
480 /* If line_open fails (and tty->driver_data is never set),
481 * tty_open will call line_close. So just return in this case.
486 /* We ignore the error anyway! */
489 spin_lock(&line->count_lock);
496 spin_unlock(&line->count_lock);
499 tty->driver_data = NULL;
502 unregister_winch(tty);
509 spin_unlock(&line->count_lock);
512 void close_lines(struct line *lines, int nlines)
516 for(i = 0; i < nlines; i++)
517 close_chan(&lines[i].chan_list, 0);
520 static int setup_one_line(struct line *lines, int n, char *init, int init_prio,
523 struct line *line = &lines[n];
526 spin_lock(&line->count_lock);
528 if(line->tty != NULL){
529 *error_out = "Device is already open";
533 if (line->init_pri <= init_prio){
534 line->init_pri = init_prio;
535 if (!strcmp(init, "none"))
538 line->init_str = init;
544 spin_unlock(&line->count_lock);
548 /* Common setup code for both startup command line and mconsole initialization.
549 * @lines contains the array (of size @num) to modify;
550 * @init is the setup string;
551 * @error_out is an error string in the case of failure;
554 int line_setup(struct line *lines, unsigned int num, char *init,
561 /* We said con=/ssl= instead of con#=, so we are configuring all
562 * consoles at once.*/
566 n = simple_strtoul(init, &end, 0);
568 *error_out = "Couldn't parse device number";
575 if (n >= (signed int) num) {
576 *error_out = "Device number out of range";
580 err = setup_one_line(lines, n, init, INIT_ONE, error_out);
585 for(i = 0; i < num; i++){
586 err = setup_one_line(lines, i, init, INIT_ALL,
592 return n == -1 ? num : n;
595 int line_config(struct line *lines, unsigned int num, char *str,
596 const struct chan_opts *opts, char **error_out)
603 *error_out = "Can't configure all devices from mconsole";
607 new = kstrdup(str, GFP_KERNEL);
609 *error_out = "Failed to allocate memory";
612 n = line_setup(lines, num, new, error_out);
617 return parse_chan_pair(line->init_str, line, n, opts, error_out);
620 int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
621 int size, char **error_out)
627 dev = simple_strtoul(name, &end, 0);
628 if((*end != '\0') || (end == name)){
629 *error_out = "line_get_config failed to parse device number";
633 if((dev < 0) || (dev >= num)){
634 *error_out = "device number out of range";
640 spin_lock(&line->count_lock);
642 CONFIG_CHUNK(str, size, n, "none", 1);
643 else if(line->tty == NULL)
644 CONFIG_CHUNK(str, size, n, line->init_str, 1);
645 else n = chan_config_string(&line->chan_list, str, size, error_out);
646 spin_unlock(&line->count_lock);
651 int line_id(char **str, int *start_out, int *end_out)
656 n = simple_strtoul(*str, &end, 0);
657 if((*end != '\0') || (end == *str))
666 int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
669 char config[sizeof("conxxxx=none\0")];
671 sprintf(config, "%d=none", n);
672 err = line_setup(lines, num, config, error_out);
678 struct tty_driver *register_lines(struct line_driver *line_driver,
679 const struct tty_operations *ops,
680 struct line *lines, int nlines)
683 struct tty_driver *driver = alloc_tty_driver(nlines);
688 driver->driver_name = line_driver->name;
689 driver->name = line_driver->device_name;
690 driver->major = line_driver->major;
691 driver->minor_start = line_driver->minor_start;
692 driver->type = line_driver->type;
693 driver->subtype = line_driver->subtype;
694 driver->flags = TTY_DRIVER_REAL_RAW;
695 driver->init_termios = tty_std_termios;
696 tty_set_operations(driver, ops);
698 if (tty_register_driver(driver)) {
699 printk("%s: can't register %s driver\n",
700 __FUNCTION__,line_driver->name);
701 put_tty_driver(driver);
705 for(i = 0; i < nlines; i++){
707 tty_unregister_device(driver, i);
710 mconsole_register_dev(&line_driver->mc);
714 static DEFINE_SPINLOCK(winch_handler_lock);
715 static LIST_HEAD(winch_handlers);
717 void lines_init(struct line *lines, int nlines, struct chan_opts *opts)
723 for(i = 0; i < nlines; i++){
725 INIT_LIST_HEAD(&line->chan_list);
727 if(line->init_str == NULL)
730 line->init_str = kstrdup(line->init_str, GFP_KERNEL);
731 if(line->init_str == NULL)
732 printk("lines_init - kstrdup returned NULL\n");
734 if(parse_chan_pair(line->init_str, line, i, opts, &error)){
735 printk("parse_chan_pair failed for device %d : %s\n",
743 struct list_head list;
747 struct tty_struct *tty;
750 static irqreturn_t winch_interrupt(int irq, void *data)
752 struct winch *winch = data;
753 struct tty_struct *tty;
759 err = generic_read(winch->fd, &c, NULL);
762 printk("winch_interrupt : read failed, "
763 "errno = %d\n", -err);
764 printk("fd %d is losing SIGWINCH support\n",
773 line = tty->driver_data;
774 chan_window_size(&line->chan_list, &tty->winsize.ws_row,
775 &tty->winsize.ws_col);
776 kill_pgrp(tty->pgrp, SIGWINCH, 1);
780 reactivate_fd(winch->fd, WINCH_IRQ);
784 void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
788 winch = kmalloc(sizeof(*winch), GFP_KERNEL);
790 printk("register_winch_irq - kmalloc failed\n");
794 *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
800 spin_lock(&winch_handler_lock);
801 list_add(&winch->list, &winch_handlers);
802 spin_unlock(&winch_handler_lock);
804 if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
805 IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
807 printk("register_winch_irq - failed to register IRQ\n");
810 static void free_winch(struct winch *winch)
812 list_del(&winch->list);
815 os_kill_process(winch->pid, 1);
817 os_close_file(winch->fd);
819 free_irq(WINCH_IRQ, winch);
823 static void unregister_winch(struct tty_struct *tty)
825 struct list_head *ele;
828 spin_lock(&winch_handler_lock);
830 list_for_each(ele, &winch_handlers){
831 winch = list_entry(ele, struct winch, list);
832 if(winch->tty == tty){
837 spin_unlock(&winch_handler_lock);
840 static void winch_cleanup(void)
842 struct list_head *ele, *next;
845 spin_lock(&winch_handler_lock);
847 list_for_each_safe(ele, next, &winch_handlers){
848 winch = list_entry(ele, struct winch, list);
852 spin_unlock(&winch_handler_lock);
854 __uml_exitcall(winch_cleanup);
856 char *add_xterm_umid(char *base)
865 len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
866 title = kmalloc(len, GFP_KERNEL);
868 printk("Failed to allocate buffer for xterm title\n");
872 snprintf(title, len, "%s (%s)", base, umid);