2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
6 #include <linux/irqreturn.h>
8 #include <linux/sched.h>
9 #include <linux/slab.h>
13 #include <kern_util.h>
16 #define LINE_BUFSIZE 4096
18 static irqreturn_t
line_interrupt(int irq
, void *data
)
20 struct chan
*chan
= data
;
21 struct line
*line
= chan
->line
;
24 chan_interrupt(line
, irq
);
30 * Returns the free space inside the ring buffer of this line.
32 * Should be called while holding line->lock (this does not modify data).
34 static int write_room(struct line
*line
)
38 if (line
->buffer
== NULL
)
39 return LINE_BUFSIZE
- 1;
41 /* This is for the case where the buffer is wrapped! */
42 n
= line
->head
- line
->tail
;
45 n
+= LINE_BUFSIZE
; /* The other case */
49 int line_write_room(struct tty_struct
*tty
)
51 struct line
*line
= tty
->driver_data
;
55 spin_lock_irqsave(&line
->lock
, flags
);
56 room
= write_room(line
);
57 spin_unlock_irqrestore(&line
->lock
, flags
);
62 int line_chars_in_buffer(struct tty_struct
*tty
)
64 struct line
*line
= tty
->driver_data
;
68 spin_lock_irqsave(&line
->lock
, flags
);
69 /* write_room subtracts 1 for the needed NULL, so we readd it.*/
70 ret
= LINE_BUFSIZE
- (write_room(line
) + 1);
71 spin_unlock_irqrestore(&line
->lock
, flags
);
77 * This copies the content of buf into the circular buffer associated with
79 * The return value is the number of characters actually copied, i.e. the ones
80 * for which there was space: this function is not supposed to ever flush out
81 * the circular buffer.
83 * Must be called while holding line->lock!
85 static int buffer_data(struct line
*line
, const char *buf
, int len
)
89 if (line
->buffer
== NULL
) {
90 line
->buffer
= kmalloc(LINE_BUFSIZE
, GFP_ATOMIC
);
91 if (line
->buffer
== NULL
) {
92 printk(KERN_ERR
"buffer_data - atomic allocation "
96 line
->head
= line
->buffer
;
97 line
->tail
= line
->buffer
;
100 room
= write_room(line
);
101 len
= (len
> room
) ? room
: len
;
103 end
= line
->buffer
+ LINE_BUFSIZE
- line
->tail
;
106 memcpy(line
->tail
, buf
, len
);
110 /* The circular buffer is wrapping */
111 memcpy(line
->tail
, buf
, end
);
113 memcpy(line
->buffer
, buf
, len
- end
);
114 line
->tail
= line
->buffer
+ len
- end
;
121 * Flushes the ring buffer to the output channels. That is, write_chan is
122 * called, passing it line->head as buffer, and an appropriate count.
124 * On exit, returns 1 when the buffer is empty,
125 * 0 when the buffer is not empty on exit,
126 * and -errno when an error occurred.
128 * Must be called while holding line->lock!*/
129 static int flush_buffer(struct line
*line
)
133 if ((line
->buffer
== NULL
) || (line
->head
== line
->tail
))
136 if (line
->tail
< line
->head
) {
137 /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
138 count
= line
->buffer
+ LINE_BUFSIZE
- line
->head
;
140 n
= write_chan(line
->chan_out
, line
->head
, count
,
141 line
->driver
->write_irq
);
146 * We have flushed from ->head to buffer end, now we
147 * must flush only from the beginning to ->tail.
149 line
->head
= line
->buffer
;
156 count
= line
->tail
- line
->head
;
157 n
= write_chan(line
->chan_out
, line
->head
, count
,
158 line
->driver
->write_irq
);
164 return line
->head
== line
->tail
;
167 void line_flush_buffer(struct tty_struct
*tty
)
169 struct line
*line
= tty
->driver_data
;
172 spin_lock_irqsave(&line
->lock
, flags
);
174 spin_unlock_irqrestore(&line
->lock
, flags
);
178 * We map both ->flush_chars and ->put_char (which go in pair) onto
179 * ->flush_buffer and ->write. Hope it's not that bad.
181 void line_flush_chars(struct tty_struct
*tty
)
183 line_flush_buffer(tty
);
186 int line_put_char(struct tty_struct
*tty
, unsigned char ch
)
188 return line_write(tty
, &ch
, sizeof(ch
));
191 int line_write(struct tty_struct
*tty
, const unsigned char *buf
, int len
)
193 struct line
*line
= tty
->driver_data
;
197 spin_lock_irqsave(&line
->lock
, flags
);
198 if (line
->head
!= line
->tail
)
199 ret
= buffer_data(line
, buf
, len
);
201 n
= write_chan(line
->chan_out
, buf
, len
,
202 line
->driver
->write_irq
);
211 ret
+= buffer_data(line
, buf
+ n
, len
);
214 spin_unlock_irqrestore(&line
->lock
, flags
);
218 void line_set_termios(struct tty_struct
*tty
, struct ktermios
* old
)
223 void line_throttle(struct tty_struct
*tty
)
225 struct line
*line
= tty
->driver_data
;
227 deactivate_chan(line
->chan_in
, line
->driver
->read_irq
);
231 void line_unthrottle(struct tty_struct
*tty
)
233 struct line
*line
= tty
->driver_data
;
236 chan_interrupt(line
, line
->driver
->read_irq
);
239 * Maybe there is enough stuff pending that calling the interrupt
240 * throttles us again. In this case, line->throttled will be 1
241 * again and we shouldn't turn the interrupt back on.
243 if (!line
->throttled
)
244 reactivate_chan(line
->chan_in
, line
->driver
->read_irq
);
247 static irqreturn_t
line_write_interrupt(int irq
, void *data
)
249 struct chan
*chan
= data
;
250 struct line
*line
= chan
->line
;
251 struct tty_struct
*tty
;
255 * Interrupts are disabled here because genirq keep irqs disabled when
256 * calling the action handler.
259 spin_lock(&line
->lock
);
260 err
= flush_buffer(line
);
262 spin_unlock(&line
->lock
);
264 } else if (err
< 0) {
265 line
->head
= line
->buffer
;
266 line
->tail
= line
->buffer
;
268 spin_unlock(&line
->lock
);
270 tty
= tty_port_tty_get(&line
->port
);
280 int line_setup_irq(int fd
, int input
, int output
, struct line
*line
, void *data
)
282 const struct line_driver
*driver
= line
->driver
;
286 err
= um_request_irq(driver
->read_irq
, fd
, IRQ_READ
,
287 line_interrupt
, IRQF_SHARED
,
288 driver
->read_irq_name
, data
);
292 err
= um_request_irq(driver
->write_irq
, fd
, IRQ_WRITE
,
293 line_write_interrupt
, IRQF_SHARED
,
294 driver
->write_irq_name
, data
);
298 static int line_activate(struct tty_port
*port
, struct tty_struct
*tty
)
301 struct line
*line
= tty
->driver_data
;
303 ret
= enable_chan(line
);
308 chan_enable_winch(line
->chan_out
, tty
);
312 chan_window_size(line
, &tty
->winsize
.ws_row
,
313 &tty
->winsize
.ws_col
);
318 static const struct tty_port_operations line_port_ops
= {
319 .activate
= line_activate
,
322 int line_open(struct tty_struct
*tty
, struct file
*filp
)
324 struct line
*line
= tty
->driver_data
;
326 return tty_port_open(&line
->port
, tty
, filp
);
329 int line_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
334 ret
= tty_standard_install(driver
, tty
);
338 tty
->driver_data
= line
;
343 static void unregister_winch(struct tty_struct
*tty
);
345 void line_cleanup(struct tty_struct
*tty
)
347 struct line
*line
= tty
->driver_data
;
350 unregister_winch(tty
);
355 void line_close(struct tty_struct
*tty
, struct file
* filp
)
357 struct line
*line
= tty
->driver_data
;
359 tty_port_close(&line
->port
, tty
, filp
);
362 void line_hangup(struct tty_struct
*tty
)
364 struct line
*line
= tty
->driver_data
;
366 tty_port_hangup(&line
->port
);
369 void close_lines(struct line
*lines
, int nlines
)
373 for(i
= 0; i
< nlines
; i
++)
374 close_chan(&lines
[i
]);
377 int setup_one_line(struct line
*lines
, int n
, char *init
,
378 const struct chan_opts
*opts
, char **error_out
)
380 struct line
*line
= &lines
[n
];
381 struct tty_driver
*driver
= line
->driver
->driver
;
384 if (line
->port
.count
) {
385 *error_out
= "Device is already open";
389 if (!strcmp(init
, "none")) {
392 kfree(line
->init_str
);
393 tty_unregister_device(driver
, n
);
394 parse_chan_pair(NULL
, line
, n
, opts
, error_out
);
398 char *new = kstrdup(init
, GFP_KERNEL
);
400 *error_out
= "Failed to allocate memory";
404 tty_unregister_device(driver
, n
);
405 kfree(line
->init_str
);
407 line
->init_str
= new;
409 err
= parse_chan_pair(new, line
, n
, opts
, error_out
);
411 struct device
*d
= tty_port_register_device(&line
->port
,
414 *error_out
= "Failed to register device";
416 parse_chan_pair(NULL
, line
, n
, opts
, error_out
);
420 line
->init_str
= NULL
;
430 * Common setup code for both startup command line and mconsole initialization.
431 * @lines contains the array (of size @num) to modify;
432 * @init is the setup string;
433 * @error_out is an error string in the case of failure;
436 int line_setup(char **conf
, unsigned int num
, char **def
,
437 char *init
, char *name
)
443 * We said con=/ssl= instead of con#=, so we are configuring all
449 unsigned n
= simple_strtoul(init
, &end
, 0);
452 error
= "Couldn't parse device number";
456 error
= "Device number out of range";
464 printk(KERN_ERR
"Failed to set up %s with "
465 "configuration string \"%s\" : %s\n", name
, init
, error
);
469 int line_config(struct line
*lines
, unsigned int num
, char *str
,
470 const struct chan_opts
*opts
, char **error_out
)
476 *error_out
= "Can't configure all devices from mconsole";
480 n
= simple_strtoul(str
, &end
, 0);
482 *error_out
= "Couldn't parse device number";
486 *error_out
= "Device number out of range";
490 return setup_one_line(lines
, n
, end
, opts
, error_out
);
493 int line_get_config(char *name
, struct line
*lines
, unsigned int num
, char *str
,
494 int size
, char **error_out
)
500 dev
= simple_strtoul(name
, &end
, 0);
501 if ((*end
!= '\0') || (end
== name
)) {
502 *error_out
= "line_get_config failed to parse device number";
506 if ((dev
< 0) || (dev
>= num
)) {
507 *error_out
= "device number out of range";
514 CONFIG_CHUNK(str
, size
, n
, "none", 1);
516 struct tty_struct
*tty
= tty_port_tty_get(&line
->port
);
518 CONFIG_CHUNK(str
, size
, n
, line
->init_str
, 1);
520 n
= chan_config_string(line
, str
, size
, error_out
);
528 int line_id(char **str
, int *start_out
, int *end_out
)
533 n
= simple_strtoul(*str
, &end
, 0);
534 if ((*end
!= '\0') || (end
== *str
))
543 int line_remove(struct line
*lines
, unsigned int num
, int n
, char **error_out
)
546 *error_out
= "Device number out of range";
549 return setup_one_line(lines
, n
, "none", NULL
, error_out
);
552 int register_lines(struct line_driver
*line_driver
,
553 const struct tty_operations
*ops
,
554 struct line
*lines
, int nlines
)
556 struct tty_driver
*driver
= alloc_tty_driver(nlines
);
563 driver
->driver_name
= line_driver
->name
;
564 driver
->name
= line_driver
->device_name
;
565 driver
->major
= line_driver
->major
;
566 driver
->minor_start
= line_driver
->minor_start
;
567 driver
->type
= line_driver
->type
;
568 driver
->subtype
= line_driver
->subtype
;
569 driver
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
570 driver
->init_termios
= tty_std_termios
;
572 for (i
= 0; i
< nlines
; i
++) {
573 tty_port_init(&lines
[i
].port
);
574 lines
[i
].port
.ops
= &line_port_ops
;
575 spin_lock_init(&lines
[i
].lock
);
576 lines
[i
].driver
= line_driver
;
577 INIT_LIST_HEAD(&lines
[i
].chan_list
);
579 tty_set_operations(driver
, ops
);
581 err
= tty_register_driver(driver
);
583 printk(KERN_ERR
"register_lines : can't register %s driver\n",
585 put_tty_driver(driver
);
586 for (i
= 0; i
< nlines
; i
++)
587 tty_port_destroy(&lines
[i
].port
);
591 line_driver
->driver
= driver
;
592 mconsole_register_dev(&line_driver
->mc
);
596 static DEFINE_SPINLOCK(winch_handler_lock
);
597 static LIST_HEAD(winch_handlers
);
600 struct list_head list
;
604 struct tty_struct
*tty
;
606 struct work_struct work
;
609 static void __free_winch(struct work_struct
*work
)
611 struct winch
*winch
= container_of(work
, struct winch
, work
);
612 um_free_irq(WINCH_IRQ
, winch
);
614 if (winch
->pid
!= -1)
615 os_kill_process(winch
->pid
, 1);
616 if (winch
->stack
!= 0)
617 free_stack(winch
->stack
, 0);
621 static void free_winch(struct winch
*winch
)
627 list_del(&winch
->list
);
628 __free_winch(&winch
->work
);
631 static irqreturn_t
winch_interrupt(int irq
, void *data
)
633 struct winch
*winch
= data
;
634 struct tty_struct
*tty
;
641 err
= generic_read(fd
, &c
, NULL
);
643 if (err
!= -EAGAIN
) {
645 list_del(&winch
->list
);
647 printk(KERN_ERR
"winch_interrupt : "
648 "read failed, errno = %d\n", -err
);
649 printk(KERN_ERR
"fd %d is losing SIGWINCH "
650 "support\n", winch
->tty_fd
);
651 INIT_WORK(&winch
->work
, __free_winch
);
652 schedule_work(&winch
->work
);
660 line
= tty
->driver_data
;
662 chan_window_size(line
, &tty
->winsize
.ws_row
,
663 &tty
->winsize
.ws_col
);
664 kill_pgrp(tty
->pgrp
, SIGWINCH
, 1);
669 reactivate_fd(winch
->fd
, WINCH_IRQ
);
673 void register_winch_irq(int fd
, int tty_fd
, int pid
, struct tty_struct
*tty
,
678 winch
= kmalloc(sizeof(*winch
), GFP_KERNEL
);
680 printk(KERN_ERR
"register_winch_irq - kmalloc failed\n");
684 *winch
= ((struct winch
) { .list
= LIST_HEAD_INIT(winch
->list
),
691 if (um_request_irq(WINCH_IRQ
, fd
, IRQ_READ
, winch_interrupt
,
692 IRQF_SHARED
, "winch", winch
) < 0) {
693 printk(KERN_ERR
"register_winch_irq - failed to register "
698 spin_lock(&winch_handler_lock
);
699 list_add(&winch
->list
, &winch_handlers
);
700 spin_unlock(&winch_handler_lock
);
707 os_kill_process(pid
, 1);
710 free_stack(stack
, 0);
713 static void unregister_winch(struct tty_struct
*tty
)
715 struct list_head
*ele
, *next
;
718 spin_lock(&winch_handler_lock
);
720 list_for_each_safe(ele
, next
, &winch_handlers
) {
721 winch
= list_entry(ele
, struct winch
, list
);
722 if (winch
->tty
== tty
) {
727 spin_unlock(&winch_handler_lock
);
730 static void winch_cleanup(void)
732 struct list_head
*ele
, *next
;
735 spin_lock(&winch_handler_lock
);
737 list_for_each_safe(ele
, next
, &winch_handlers
) {
738 winch
= list_entry(ele
, struct winch
, list
);
742 spin_unlock(&winch_handler_lock
);
744 __uml_exitcall(winch_cleanup
);
746 char *add_xterm_umid(char *base
)
755 len
= strlen(base
) + strlen(" ()") + strlen(umid
) + 1;
756 title
= kmalloc(len
, GFP_KERNEL
);
758 printk(KERN_ERR
"Failed to allocate buffer for xterm title\n");
762 snprintf(title
, len
, "%s (%s)", base
, umid
);