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 "user_util.h"
17 #include "kern_util.h"
21 #define LINE_BUFSIZE 4096
23 static irqreturn_t
line_interrupt(int irq
, void *data
)
25 struct chan
*chan
= data
;
26 struct line
*line
= chan
->line
;
27 struct tty_struct
*tty
= line
->tty
;
30 chan_interrupt(&line
->chan_list
, &line
->task
, tty
, irq
);
34 static void line_timer_cb(struct work_struct
*work
)
36 struct line
*line
= container_of(work
, struct line
, task
.work
);
39 chan_interrupt(&line
->chan_list
, &line
->task
, line
->tty
,
40 line
->driver
->read_irq
);
43 /* Returns the free space inside the ring buffer of this line.
45 * Should be called while holding line->lock (this does not modify datas).
47 static int write_room(struct line
*line
)
51 if (line
->buffer
== NULL
)
52 return LINE_BUFSIZE
- 1;
54 /* This is for the case where the buffer is wrapped! */
55 n
= line
->head
- line
->tail
;
58 n
= LINE_BUFSIZE
+ n
; /* The other case */
62 int line_write_room(struct tty_struct
*tty
)
64 struct line
*line
= tty
->driver_data
;
71 spin_lock_irqsave(&line
->lock
, flags
);
72 room
= write_room(line
);
73 spin_unlock_irqrestore(&line
->lock
, flags
);
75 /*XXX: Warning to remove */
77 printk(KERN_DEBUG
"%s: %s: no room left in buffer\n",
78 __FUNCTION__
,tty
->name
);
82 int line_chars_in_buffer(struct tty_struct
*tty
)
84 struct line
*line
= tty
->driver_data
;
88 spin_lock_irqsave(&line
->lock
, flags
);
90 /*write_room subtracts 1 for the needed NULL, so we readd it.*/
91 ret
= LINE_BUFSIZE
- (write_room(line
) + 1);
92 spin_unlock_irqrestore(&line
->lock
, flags
);
98 * This copies the content of buf into the circular buffer associated with
100 * The return value is the number of characters actually copied, i.e. the ones
101 * for which there was space: this function is not supposed to ever flush out
102 * the circular buffer.
104 * Must be called while holding line->lock!
106 static int buffer_data(struct line
*line
, const char *buf
, int len
)
110 if(line
->buffer
== NULL
){
111 line
->buffer
= kmalloc(LINE_BUFSIZE
, GFP_ATOMIC
);
112 if (line
->buffer
== NULL
) {
113 printk("buffer_data - atomic allocation failed\n");
116 line
->head
= line
->buffer
;
117 line
->tail
= line
->buffer
;
120 room
= write_room(line
);
121 len
= (len
> room
) ? room
: len
;
123 end
= line
->buffer
+ LINE_BUFSIZE
- line
->tail
;
126 memcpy(line
->tail
, buf
, len
);
130 /* The circular buffer is wrapping */
131 memcpy(line
->tail
, buf
, end
);
133 memcpy(line
->buffer
, buf
, len
- end
);
134 line
->tail
= line
->buffer
+ len
- end
;
141 * Flushes the ring buffer to the output channels. That is, write_chan is
142 * called, passing it line->head as buffer, and an appropriate count.
144 * On exit, returns 1 when the buffer is empty,
145 * 0 when the buffer is not empty on exit,
146 * and -errno when an error occurred.
148 * Must be called while holding line->lock!*/
149 static int flush_buffer(struct line
*line
)
153 if ((line
->buffer
== NULL
) || (line
->head
== line
->tail
))
156 if (line
->tail
< line
->head
) {
157 /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
158 count
= line
->buffer
+ LINE_BUFSIZE
- line
->head
;
160 n
= write_chan(&line
->chan_list
, line
->head
, count
,
161 line
->driver
->write_irq
);
165 /* We have flushed from ->head to buffer end, now we
166 * must flush only from the beginning to ->tail.*/
167 line
->head
= line
->buffer
;
174 count
= line
->tail
- line
->head
;
175 n
= write_chan(&line
->chan_list
, line
->head
, count
,
176 line
->driver
->write_irq
);
182 return line
->head
== line
->tail
;
185 void line_flush_buffer(struct tty_struct
*tty
)
187 struct line
*line
= tty
->driver_data
;
191 /*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 ktermios
* old
)
253 static const struct {
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 void line_throttle(struct tty_struct
*tty
)
344 struct line
*line
= tty
->driver_data
;
346 deactivate_chan(&line
->chan_list
, line
->driver
->read_irq
);
350 void line_unthrottle(struct tty_struct
*tty
)
352 struct line
*line
= tty
->driver_data
;
355 chan_interrupt(&line
->chan_list
, &line
->task
, tty
,
356 line
->driver
->read_irq
);
358 /* Maybe there is enough stuff pending that calling the interrupt
359 * throttles us again. In this case, line->throttled will be 1
360 * again and we shouldn't turn the interrupt back on.
363 reactivate_chan(&line
->chan_list
, line
->driver
->read_irq
);
366 static irqreturn_t
line_write_interrupt(int irq
, void *data
)
368 struct chan
*chan
= data
;
369 struct line
*line
= chan
->line
;
370 struct tty_struct
*tty
= line
->tty
;
373 /* Interrupts are disabled here because we registered the interrupt with
374 * IRQF_DISABLED (see line_setup_irq).*/
376 spin_lock(&line
->lock
);
377 err
= flush_buffer(line
);
381 line
->head
= line
->buffer
;
382 line
->tail
= line
->buffer
;
384 spin_unlock(&line
->lock
);
389 if (test_bit(TTY_DO_WRITE_WAKEUP
, &tty
->flags
) &&
390 (tty
->ldisc
.write_wakeup
!= NULL
))
391 (tty
->ldisc
.write_wakeup
)(tty
);
394 * In blocking mode, everything sleeps on tty->write_wait.
395 * Sleeping in the console driver would break non-blocking
399 if (waitqueue_active(&tty
->write_wait
))
400 wake_up_interruptible(&tty
->write_wait
);
404 int line_setup_irq(int fd
, int input
, int output
, struct line
*line
, void *data
)
406 const struct line_driver
*driver
= line
->driver
;
407 int err
= 0, flags
= IRQF_DISABLED
| IRQF_SHARED
| IRQF_SAMPLE_RANDOM
;
410 err
= um_request_irq(driver
->read_irq
, fd
, IRQ_READ
,
411 line_interrupt
, flags
,
412 driver
->read_irq_name
, data
);
416 err
= um_request_irq(driver
->write_irq
, fd
, IRQ_WRITE
,
417 line_write_interrupt
, flags
,
418 driver
->write_irq_name
, data
);
423 /* Normally, a driver like this can rely mostly on the tty layer
424 * locking, particularly when it comes to the driver structure.
425 * However, in this case, mconsole requests can come in "from the
426 * side", and race with opens and closes.
428 * mconsole config requests will want to be sure the device isn't in
429 * use, and get_config, open, and close will want a stable
430 * configuration. The checking and modification of the configuration
431 * is done under a spinlock. Checking whether the device is in use is
432 * line->tty->count > 1, also under the spinlock.
434 * tty->count serves to decide whether the device should be enabled or
435 * disabled on the host. If it's equal to 1, then we are doing the
436 * first open or last close. Otherwise, open and close just return.
439 int line_open(struct line
*lines
, struct tty_struct
*tty
)
441 struct line
*line
= &lines
[tty
->index
];
444 spin_lock(&line
->count_lock
);
452 spin_unlock(&line
->count_lock
);
454 tty
->driver_data
= line
;
458 INIT_DELAYED_WORK(&line
->task
, line_timer_cb
);
461 chan_enable_winch(&line
->chan_list
, tty
);
465 chan_window_size(&line
->chan_list
, &tty
->winsize
.ws_row
,
466 &tty
->winsize
.ws_col
);
471 spin_unlock(&line
->count_lock
);
475 static void unregister_winch(struct tty_struct
*tty
);
477 void line_close(struct tty_struct
*tty
, struct file
* filp
)
479 struct line
*line
= tty
->driver_data
;
481 /* If line_open fails (and tty->driver_data is never set),
482 * tty_open will call line_close. So just return in this case.
487 /* We ignore the error anyway! */
490 spin_lock(&line
->count_lock
);
497 spin_unlock(&line
->count_lock
);
500 tty
->driver_data
= NULL
;
503 unregister_winch(tty
);
510 spin_unlock(&line
->count_lock
);
513 void close_lines(struct line
*lines
, int nlines
)
517 for(i
= 0; i
< nlines
; i
++)
518 close_chan(&lines
[i
].chan_list
, 0);
521 static int setup_one_line(struct line
*lines
, int n
, char *init
, int init_prio
,
524 struct line
*line
= &lines
[n
];
527 spin_lock(&line
->count_lock
);
529 if(line
->tty
!= NULL
){
530 *error_out
= "Device is already open";
534 if (line
->init_pri
<= init_prio
){
535 line
->init_pri
= init_prio
;
536 if (!strcmp(init
, "none"))
539 line
->init_str
= init
;
545 spin_unlock(&line
->count_lock
);
549 /* Common setup code for both startup command line and mconsole initialization.
550 * @lines contains the array (of size @num) to modify;
551 * @init is the setup string;
552 * @error_out is an error string in the case of failure;
555 int line_setup(struct line
*lines
, unsigned int num
, char *init
,
562 /* We said con=/ssl= instead of con#=, so we are configuring all
563 * consoles at once.*/
567 n
= simple_strtoul(init
, &end
, 0);
569 *error_out
= "Couldn't parse device number";
576 if (n
>= (signed int) num
) {
577 *error_out
= "Device number out of range";
581 err
= setup_one_line(lines
, n
, init
, INIT_ONE
, error_out
);
586 for(i
= 0; i
< num
; i
++){
587 err
= setup_one_line(lines
, i
, init
, INIT_ALL
,
593 return n
== -1 ? num
: n
;
596 int line_config(struct line
*lines
, unsigned int num
, char *str
,
597 const struct chan_opts
*opts
, char **error_out
)
604 *error_out
= "Can't configure all devices from mconsole";
608 new = kstrdup(str
, GFP_KERNEL
);
610 *error_out
= "Failed to allocate memory";
613 n
= line_setup(lines
, num
, new, error_out
);
618 return parse_chan_pair(line
->init_str
, line
, n
, opts
, error_out
);
621 int line_get_config(char *name
, struct line
*lines
, unsigned int num
, char *str
,
622 int size
, char **error_out
)
628 dev
= simple_strtoul(name
, &end
, 0);
629 if((*end
!= '\0') || (end
== name
)){
630 *error_out
= "line_get_config failed to parse device number";
634 if((dev
< 0) || (dev
>= num
)){
635 *error_out
= "device number out of range";
641 spin_lock(&line
->count_lock
);
643 CONFIG_CHUNK(str
, size
, n
, "none", 1);
644 else if(line
->tty
== NULL
)
645 CONFIG_CHUNK(str
, size
, n
, line
->init_str
, 1);
646 else n
= chan_config_string(&line
->chan_list
, str
, size
, error_out
);
647 spin_unlock(&line
->count_lock
);
652 int line_id(char **str
, int *start_out
, int *end_out
)
657 n
= simple_strtoul(*str
, &end
, 0);
658 if((*end
!= '\0') || (end
== *str
))
667 int line_remove(struct line
*lines
, unsigned int num
, int n
, char **error_out
)
670 char config
[sizeof("conxxxx=none\0")];
672 sprintf(config
, "%d=none", n
);
673 err
= line_setup(lines
, num
, config
, error_out
);
679 struct tty_driver
*register_lines(struct line_driver
*line_driver
,
680 const struct tty_operations
*ops
,
681 struct line
*lines
, int nlines
)
684 struct tty_driver
*driver
= alloc_tty_driver(nlines
);
689 driver
->driver_name
= line_driver
->name
;
690 driver
->name
= line_driver
->device_name
;
691 driver
->major
= line_driver
->major
;
692 driver
->minor_start
= line_driver
->minor_start
;
693 driver
->type
= line_driver
->type
;
694 driver
->subtype
= line_driver
->subtype
;
695 driver
->flags
= TTY_DRIVER_REAL_RAW
;
696 driver
->init_termios
= tty_std_termios
;
697 tty_set_operations(driver
, ops
);
699 if (tty_register_driver(driver
)) {
700 printk("%s: can't register %s driver\n",
701 __FUNCTION__
,line_driver
->name
);
702 put_tty_driver(driver
);
706 for(i
= 0; i
< nlines
; i
++){
708 tty_unregister_device(driver
, i
);
711 mconsole_register_dev(&line_driver
->mc
);
715 static DEFINE_SPINLOCK(winch_handler_lock
);
716 static LIST_HEAD(winch_handlers
);
718 void lines_init(struct line
*lines
, int nlines
, struct chan_opts
*opts
)
724 for(i
= 0; i
< nlines
; i
++){
726 INIT_LIST_HEAD(&line
->chan_list
);
728 if(line
->init_str
== NULL
)
731 line
->init_str
= kstrdup(line
->init_str
, GFP_KERNEL
);
732 if(line
->init_str
== NULL
)
733 printk("lines_init - kstrdup returned NULL\n");
735 if(parse_chan_pair(line
->init_str
, line
, i
, opts
, &error
)){
736 printk("parse_chan_pair failed for device %d : %s\n",
744 struct list_head list
;
748 struct tty_struct
*tty
;
751 static irqreturn_t
winch_interrupt(int irq
, void *data
)
753 struct winch
*winch
= data
;
754 struct tty_struct
*tty
;
760 err
= generic_read(winch
->fd
, &c
, NULL
);
763 printk("winch_interrupt : read failed, "
764 "errno = %d\n", -err
);
765 printk("fd %d is losing SIGWINCH support\n",
774 line
= tty
->driver_data
;
775 chan_window_size(&line
->chan_list
, &tty
->winsize
.ws_row
,
776 &tty
->winsize
.ws_col
);
777 kill_pgrp(tty
->pgrp
, SIGWINCH
, 1);
781 reactivate_fd(winch
->fd
, WINCH_IRQ
);
785 void register_winch_irq(int fd
, int tty_fd
, int pid
, struct tty_struct
*tty
)
789 winch
= kmalloc(sizeof(*winch
), GFP_KERNEL
);
791 printk("register_winch_irq - kmalloc failed\n");
795 *winch
= ((struct winch
) { .list
= LIST_HEAD_INIT(winch
->list
),
801 spin_lock(&winch_handler_lock
);
802 list_add(&winch
->list
, &winch_handlers
);
803 spin_unlock(&winch_handler_lock
);
805 if(um_request_irq(WINCH_IRQ
, fd
, IRQ_READ
, winch_interrupt
,
806 IRQF_DISABLED
| IRQF_SHARED
| IRQF_SAMPLE_RANDOM
,
808 printk("register_winch_irq - failed to register IRQ\n");
811 static void free_winch(struct winch
*winch
)
813 list_del(&winch
->list
);
816 os_kill_process(winch
->pid
, 1);
818 os_close_file(winch
->fd
);
820 free_irq(WINCH_IRQ
, winch
);
824 static void unregister_winch(struct tty_struct
*tty
)
826 struct list_head
*ele
;
829 spin_lock(&winch_handler_lock
);
831 list_for_each(ele
, &winch_handlers
){
832 winch
= list_entry(ele
, struct winch
, list
);
833 if(winch
->tty
== tty
){
838 spin_unlock(&winch_handler_lock
);
841 static void winch_cleanup(void)
843 struct list_head
*ele
, *next
;
846 spin_lock(&winch_handler_lock
);
848 list_for_each_safe(ele
, next
, &winch_handlers
){
849 winch
= list_entry(ele
, struct winch
, list
);
853 spin_unlock(&winch_handler_lock
);
855 __uml_exitcall(winch_cleanup
);
857 char *add_xterm_umid(char *base
)
866 len
= strlen(base
) + strlen(" ()") + strlen(umid
) + 1;
867 title
= kmalloc(len
, GFP_KERNEL
);
869 printk("Failed to allocate buffer for xterm title\n");
873 snprintf(title
, len
, "%s (%s)", base
, umid
);