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 "linux/devfs_fs_kernel.h"
12 #include "asm/uaccess.h"
13 #include "chan_kern.h"
17 #include "user_util.h"
18 #include "kern_util.h"
22 #define LINE_BUFSIZE 4096
24 static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused)
26 struct tty_struct *tty = data;
27 struct line *line = tty->driver_data;
30 chan_interrupt(&line->chan_list, &line->task, tty, irq);
34 static void line_timer_cb(void *arg)
36 struct tty_struct *tty = arg;
37 struct line *line = tty->driver_data;
39 line_interrupt(line->driver->read_irq, arg, NULL);
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!*/
195 spin_lock_irqsave(&line->lock, flags);
196 err = flush_buffer(line);
199 spin_unlock_irqrestore(&line->lock, flags);
203 /* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer
204 * and ->write. Hope it's not that bad.*/
205 void line_flush_chars(struct tty_struct *tty)
207 line_flush_buffer(tty);
210 void line_put_char(struct tty_struct *tty, unsigned char ch)
212 line_write(tty, &ch, sizeof(ch));
215 int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
217 struct line *line = tty->driver_data;
224 spin_lock_irqsave(&line->lock, flags);
225 if (line->head != line->tail) {
226 ret = buffer_data(line, buf, len);
227 err = flush_buffer(line);
228 if (err <= 0 && (err != -EAGAIN || !ret))
231 n = write_chan(&line->chan_list, buf, len,
232 line->driver->write_irq);
241 ret += buffer_data(line, buf + n, len);
244 spin_unlock_irqrestore(&line->lock, flags);
248 void line_set_termios(struct tty_struct *tty, struct termios * old)
258 /* don't print these, they flood the log ... */
259 { TCGETS, NULL, "TCGETS" },
260 { TCSETS, NULL, "TCSETS" },
261 { TCSETSW, NULL, "TCSETSW" },
262 { TCFLSH, NULL, "TCFLSH" },
263 { TCSBRK, NULL, "TCSBRK" },
265 /* general tty stuff */
266 { TCSETSF, KERN_DEBUG, "TCSETSF" },
267 { TCGETA, KERN_DEBUG, "TCGETA" },
268 { TIOCMGET, KERN_DEBUG, "TIOCMGET" },
269 { TCSBRKP, KERN_DEBUG, "TCSBRKP" },
270 { TIOCMSET, KERN_DEBUG, "TIOCMSET" },
272 /* linux-specific ones */
273 { TIOCLINUX, KERN_INFO, "TIOCLINUX" },
274 { KDGKBMODE, KERN_INFO, "KDGKBMODE" },
275 { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" },
276 { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" },
279 int line_ioctl(struct tty_struct *tty, struct file * file,
280 unsigned int cmd, unsigned long arg)
324 for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
325 if (cmd == tty_ioctls[i].cmd)
327 if (i < ARRAY_SIZE(tty_ioctls)) {
328 if (NULL != tty_ioctls[i].level)
329 printk("%s%s: %s: ioctl %s called\n",
330 tty_ioctls[i].level, __FUNCTION__,
331 tty->name, tty_ioctls[i].name);
333 printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
334 __FUNCTION__, tty->name, cmd);
342 static irqreturn_t line_write_interrupt(int irq, void *data,
343 struct pt_regs *unused)
345 struct tty_struct *tty = data;
346 struct line *line = tty->driver_data;
349 /* Interrupts are enabled here because we registered the interrupt with
350 * SA_INTERRUPT (see line_setup_irq).*/
352 spin_lock_irq(&line->lock);
353 err = flush_buffer(line);
357 line->head = line->buffer;
358 line->tail = line->buffer;
360 spin_unlock_irq(&line->lock);
365 if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
366 (tty->ldisc.write_wakeup != NULL))
367 (tty->ldisc.write_wakeup)(tty);
370 * In blocking mode, everything sleeps on tty->write_wait.
371 * Sleeping in the console driver would break non-blocking
375 if (waitqueue_active(&tty->write_wait))
376 wake_up_interruptible(&tty->write_wait);
380 int line_setup_irq(int fd, int input, int output, struct tty_struct *tty)
382 struct line *line = tty->driver_data;
383 struct line_driver *driver = line->driver;
384 int err = 0, flags = SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM;
387 err = um_request_irq(driver->read_irq, fd, IRQ_READ,
388 line_interrupt, flags,
389 driver->read_irq_name, tty);
393 err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
394 line_write_interrupt, flags,
395 driver->write_irq_name, tty);
400 void line_disable(struct tty_struct *tty, int current_irq)
402 struct line *line = tty->driver_data;
407 if(line->driver->read_irq == current_irq)
408 free_irq_later(line->driver->read_irq, tty);
410 free_irq(line->driver->read_irq, tty);
413 if(line->driver->write_irq == current_irq)
414 free_irq_later(line->driver->write_irq, tty);
416 free_irq(line->driver->write_irq, tty);
422 int line_open(struct line *lines, struct tty_struct *tty)
427 line = &lines[tty->index];
428 tty->driver_data = line;
430 /* The IRQ which takes this lock is not yet enabled and won't be run
431 * before the end, so we don't need to use spin_lock_irq.*/
432 spin_lock(&line->lock);
433 if (tty->count == 1) {
439 err = open_chan(&line->chan_list);
443 /* Here the interrupt is registered.*/
444 enable_chan(&line->chan_list, tty);
445 INIT_WORK(&line->task, line_timer_cb, tty);
449 chan_enable_winch(&line->chan_list, tty);
452 chan_window_size(&line->chan_list, &tty->winsize.ws_row,
453 &tty->winsize.ws_col);
457 spin_unlock(&line->lock);
461 static void unregister_winch(struct tty_struct *tty);
463 void line_close(struct tty_struct *tty, struct file * filp)
465 struct line *line = tty->driver_data;
467 /* XXX: I assume this should be called in process context, not with
468 * interrupts disabled!
470 spin_lock_irq(&line->lock);
472 /* We ignore the error anyway! */
476 if (tty->count == 1) {
477 line_disable(tty, -1);
478 tty->driver_data = NULL;
481 if((line->count == 0) && line->sigio){
482 unregister_winch(tty);
486 spin_unlock_irq(&line->lock);
489 void close_lines(struct line *lines, int nlines)
493 for(i = 0; i < nlines; i++)
494 close_chan(&lines[i].chan_list);
497 /* Common setup code for both startup command line and mconsole initialization.
498 * @lines contains the the array (of size @num) to modify;
499 * @init is the setup string;
502 int line_setup(struct line *lines, unsigned int num, char *init)
508 /* We said con=/ssl= instead of con#=, so we are configuring all
509 * consoles at once.*/
513 n = simple_strtoul(init, &end, 0);
515 printk(KERN_ERR "line_setup failed to parse \"%s\"\n",
523 if (n >= (signed int) num) {
524 printk("line_setup - %d out of range ((0 ... %d) allowed)\n",
529 if (lines[n].count > 0) {
530 printk("line_setup - device %d is open\n", n);
533 if (lines[n].init_pri <= INIT_ONE){
534 lines[n].init_pri = INIT_ONE;
535 if (!strcmp(init, "none"))
538 lines[n].init_str = init;
544 for(i = 0; i < num; i++){
545 if(lines[i].init_pri <= INIT_ALL){
546 lines[i].init_pri = INIT_ALL;
547 if(!strcmp(init, "none")) lines[i].valid = 0;
549 lines[i].init_str = init;
555 return n == -1 ? num : n;
558 int line_config(struct line *lines, unsigned int num, char *str,
559 struct chan_opts *opts)
566 printk("line_config - can't configure all devices from "
571 new = kstrdup(str, GFP_KERNEL);
573 printk("line_config - kstrdup failed\n");
576 n = line_setup(lines, num, new);
581 return parse_chan_pair(line->init_str, &line->chan_list, n, opts);
584 int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
585 int size, char **error_out)
591 dev = simple_strtoul(name, &end, 0);
592 if((*end != '\0') || (end == name)){
593 *error_out = "line_get_config failed to parse device number";
597 if((dev < 0) || (dev >= num)){
598 *error_out = "device number out of range";
604 spin_lock(&line->lock);
606 CONFIG_CHUNK(str, size, n, "none", 1);
607 else if(line->count == 0)
608 CONFIG_CHUNK(str, size, n, line->init_str, 1);
609 else n = chan_config_string(&line->chan_list, str, size, error_out);
610 spin_unlock(&line->lock);
615 int line_id(char **str, int *start_out, int *end_out)
620 n = simple_strtoul(*str, &end, 0);
621 if((*end != '\0') || (end == *str))
630 int line_remove(struct line *lines, unsigned int num, int n)
633 char config[sizeof("conxxxx=none\0")];
635 sprintf(config, "%d=none", n);
636 err = line_setup(lines, num, config);
642 struct tty_driver *line_register_devfs(struct lines *set,
643 struct line_driver *line_driver,
644 struct tty_operations *ops, struct line *lines,
648 struct tty_driver *driver = alloc_tty_driver(nlines);
653 driver->driver_name = line_driver->name;
654 driver->name = line_driver->device_name;
655 driver->devfs_name = line_driver->devfs_name;
656 driver->major = line_driver->major;
657 driver->minor_start = line_driver->minor_start;
658 driver->type = line_driver->type;
659 driver->subtype = line_driver->subtype;
660 driver->flags = TTY_DRIVER_REAL_RAW;
661 driver->init_termios = tty_std_termios;
662 tty_set_operations(driver, ops);
664 if (tty_register_driver(driver)) {
665 printk("%s: can't register %s driver\n",
666 __FUNCTION__,line_driver->name);
667 put_tty_driver(driver);
671 for(i = 0; i < nlines; i++){
673 tty_unregister_device(driver, i);
676 mconsole_register_dev(&line_driver->mc);
680 static DEFINE_SPINLOCK(winch_handler_lock);
681 static LIST_HEAD(winch_handlers);
683 void lines_init(struct line *lines, int nlines, struct chan_opts *opts)
688 for(i = 0; i < nlines; i++){
690 INIT_LIST_HEAD(&line->chan_list);
692 if(line->init_str == NULL)
695 line->init_str = kstrdup(line->init_str, GFP_KERNEL);
696 if(line->init_str == NULL)
697 printk("lines_init - kstrdup returned NULL\n");
699 if(parse_chan_pair(line->init_str, &line->chan_list, i, opts)){
700 printk("parse_chan_pair failed for device %d\n", i);
707 struct list_head list;
711 struct tty_struct *tty;
714 irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
716 struct winch *winch = data;
717 struct tty_struct *tty;
723 err = generic_read(winch->fd, &c, NULL);
726 printk("winch_interrupt : read failed, "
727 "errno = %d\n", -err);
728 printk("fd %d is losing SIGWINCH support\n",
737 line = tty->driver_data;
738 chan_window_size(&line->chan_list, &tty->winsize.ws_row,
739 &tty->winsize.ws_col);
740 kill_pg(tty->pgrp, SIGWINCH, 1);
744 reactivate_fd(winch->fd, WINCH_IRQ);
748 void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
752 winch = kmalloc(sizeof(*winch), GFP_KERNEL);
754 printk("register_winch_irq - kmalloc failed\n");
758 *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
764 spin_lock(&winch_handler_lock);
765 list_add(&winch->list, &winch_handlers);
766 spin_unlock(&winch_handler_lock);
768 if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
769 SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
771 printk("register_winch_irq - failed to register IRQ\n");
774 static void unregister_winch(struct tty_struct *tty)
776 struct list_head *ele;
777 struct winch *winch, *found = NULL;
779 spin_lock(&winch_handler_lock);
780 list_for_each(ele, &winch_handlers){
781 winch = list_entry(ele, struct winch, list);
782 if(winch->tty == tty){
790 list_del(&winch->list);
791 spin_unlock(&winch_handler_lock);
794 os_kill_process(winch->pid, 1);
796 free_irq(WINCH_IRQ, winch);
801 spin_unlock(&winch_handler_lock);
804 /* XXX: No lock as it's an exitcall... is this valid? Depending on cleanup
805 * order... are we sure that nothing else is done on the list? */
806 static void winch_cleanup(void)
808 struct list_head *ele;
811 list_for_each(ele, &winch_handlers){
812 winch = list_entry(ele, struct winch, list);
814 /* Why is this different from the above free_irq(),
815 * which deactivates SIGIO? This searches the FD
816 * somewhere else and removes it from the list... */
817 deactivate_fd(winch->fd, WINCH_IRQ);
818 os_close_file(winch->fd);
821 os_kill_process(winch->pid, 1);
824 __uml_exitcall(winch_cleanup);
826 char *add_xterm_umid(char *base)
835 len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
836 title = kmalloc(len, GFP_KERNEL);
838 printk("Failed to allocate buffer for xterm title\n");
842 snprintf(title, len, "%s (%s)", base, umid);