![Alan Cox](/assets/img/avatar_default.png)
Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
872 lines
19 KiB
C
872 lines
19 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/irqreturn.h"
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#include "linux/kd.h"
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#include "chan_kern.h"
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#include "irq_kern.h"
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#include "irq_user.h"
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#include "kern_util.h"
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#include "os.h"
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#define LINE_BUFSIZE 4096
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static irqreturn_t line_interrupt(int irq, void *data)
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{
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struct chan *chan = data;
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struct line *line = chan->line;
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struct tty_struct *tty = line->tty;
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if (line)
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chan_interrupt(&line->chan_list, &line->task, tty, irq);
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return IRQ_HANDLED;
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}
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static void line_timer_cb(struct work_struct *work)
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{
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struct line *line = container_of(work, struct line, task.work);
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if (!line->throttled)
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chan_interrupt(&line->chan_list, &line->task, line->tty,
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line->driver->read_irq);
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}
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/*
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* Returns the free space inside the ring buffer of this line.
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*
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* Should be called while holding line->lock (this does not modify data).
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*/
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static int write_room(struct line *line)
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{
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int n;
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if (line->buffer == NULL)
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return LINE_BUFSIZE - 1;
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/* This is for the case where the buffer is wrapped! */
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n = line->head - line->tail;
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if (n <= 0)
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n += LINE_BUFSIZE; /* The other case */
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return n - 1;
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}
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int line_write_room(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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unsigned long flags;
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int room;
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spin_lock_irqsave(&line->lock, flags);
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room = write_room(line);
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spin_unlock_irqrestore(&line->lock, flags);
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return room;
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}
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int line_chars_in_buffer(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&line->lock, flags);
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/* write_room subtracts 1 for the needed NULL, so we readd it.*/
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ret = LINE_BUFSIZE - (write_room(line) + 1);
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spin_unlock_irqrestore(&line->lock, flags);
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return ret;
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}
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/*
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* This copies the content of buf into the circular buffer associated with
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* this line.
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* The return value is the number of characters actually copied, i.e. the ones
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* for which there was space: this function is not supposed to ever flush out
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* the circular buffer.
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*
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* Must be called while holding line->lock!
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*/
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static int buffer_data(struct line *line, const char *buf, int len)
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{
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int end, room;
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if (line->buffer == NULL) {
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line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
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if (line->buffer == NULL) {
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printk(KERN_ERR "buffer_data - atomic allocation "
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"failed\n");
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return 0;
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}
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line->head = line->buffer;
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line->tail = line->buffer;
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}
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room = write_room(line);
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len = (len > room) ? room : len;
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end = line->buffer + LINE_BUFSIZE - line->tail;
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if (len < end) {
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memcpy(line->tail, buf, len);
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line->tail += len;
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}
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else {
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/* The circular buffer is wrapping */
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memcpy(line->tail, buf, end);
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buf += end;
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memcpy(line->buffer, buf, len - end);
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line->tail = line->buffer + len - end;
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}
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return len;
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}
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/*
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* Flushes the ring buffer to the output channels. That is, write_chan is
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* called, passing it line->head as buffer, and an appropriate count.
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*
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* On exit, returns 1 when the buffer is empty,
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* 0 when the buffer is not empty on exit,
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* and -errno when an error occurred.
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*
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* Must be called while holding line->lock!*/
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static int flush_buffer(struct line *line)
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{
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int n, count;
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if ((line->buffer == NULL) || (line->head == line->tail))
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return 1;
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if (line->tail < line->head) {
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/* line->buffer + LINE_BUFSIZE is the end of the buffer! */
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count = line->buffer + LINE_BUFSIZE - line->head;
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n = write_chan(&line->chan_list, line->head, count,
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line->driver->write_irq);
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if (n < 0)
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return n;
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if (n == count) {
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/*
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* We have flushed from ->head to buffer end, now we
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* must flush only from the beginning to ->tail.
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*/
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line->head = line->buffer;
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} else {
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line->head += n;
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return 0;
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}
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}
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count = line->tail - line->head;
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n = write_chan(&line->chan_list, line->head, count,
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line->driver->write_irq);
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if (n < 0)
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return n;
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line->head += n;
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return line->head == line->tail;
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}
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void line_flush_buffer(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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unsigned long flags;
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int err;
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spin_lock_irqsave(&line->lock, flags);
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err = flush_buffer(line);
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spin_unlock_irqrestore(&line->lock, flags);
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}
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/*
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* We map both ->flush_chars and ->put_char (which go in pair) onto
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* ->flush_buffer and ->write. Hope it's not that bad.
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*/
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void line_flush_chars(struct tty_struct *tty)
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{
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line_flush_buffer(tty);
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}
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int line_put_char(struct tty_struct *tty, unsigned char ch)
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{
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return line_write(tty, &ch, sizeof(ch));
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}
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int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
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{
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struct line *line = tty->driver_data;
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unsigned long flags;
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int n, ret = 0;
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spin_lock_irqsave(&line->lock, flags);
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if (line->head != line->tail)
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ret = buffer_data(line, buf, len);
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else {
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n = write_chan(&line->chan_list, buf, len,
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line->driver->write_irq);
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if (n < 0) {
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ret = n;
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goto out_up;
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}
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len -= n;
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ret += n;
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if (len > 0)
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ret += buffer_data(line, buf + n, len);
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}
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out_up:
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spin_unlock_irqrestore(&line->lock, flags);
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return ret;
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}
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void line_set_termios(struct tty_struct *tty, struct ktermios * old)
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{
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/* nothing */
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}
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static const struct {
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int cmd;
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char *level;
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char *name;
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} tty_ioctls[] = {
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/* don't print these, they flood the log ... */
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{ TCGETS, NULL, "TCGETS" },
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{ TCSETS, NULL, "TCSETS" },
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{ TCSETSW, NULL, "TCSETSW" },
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{ TCFLSH, NULL, "TCFLSH" },
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{ TCSBRK, NULL, "TCSBRK" },
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/* general tty stuff */
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{ TCSETSF, KERN_DEBUG, "TCSETSF" },
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{ TCGETA, KERN_DEBUG, "TCGETA" },
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{ TIOCMGET, KERN_DEBUG, "TIOCMGET" },
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{ TCSBRKP, KERN_DEBUG, "TCSBRKP" },
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{ TIOCMSET, KERN_DEBUG, "TIOCMSET" },
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/* linux-specific ones */
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{ TIOCLINUX, KERN_INFO, "TIOCLINUX" },
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{ KDGKBMODE, KERN_INFO, "KDGKBMODE" },
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{ KDGKBTYPE, KERN_INFO, "KDGKBTYPE" },
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{ KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" },
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};
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int line_ioctl(struct tty_struct *tty, struct file * file,
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unsigned int cmd, unsigned long arg)
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{
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int ret;
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int i;
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ret = 0;
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switch(cmd) {
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#ifdef TIOCGETP
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case TIOCGETP:
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case TIOCSETP:
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case TIOCSETN:
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#endif
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#ifdef TIOCGETC
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case TIOCGETC:
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case TIOCSETC:
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#endif
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#ifdef TIOCGLTC
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case TIOCGLTC:
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case TIOCSLTC:
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#endif
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/* Note: these are out of date as we now have TCGETS2 etc but this
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whole lot should probably go away */
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case TCGETS:
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case TCSETSF:
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case TCSETSW:
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case TCSETS:
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case TCGETA:
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case TCSETAF:
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case TCSETAW:
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case TCSETA:
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case TCXONC:
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case TCFLSH:
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case TIOCOUTQ:
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case TIOCINQ:
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case TIOCGLCKTRMIOS:
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case TIOCSLCKTRMIOS:
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case TIOCPKT:
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case TIOCGSOFTCAR:
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case TIOCSSOFTCAR:
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return -ENOIOCTLCMD;
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#if 0
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case TCwhatever:
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/* do something */
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break;
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#endif
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default:
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for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
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if (cmd == tty_ioctls[i].cmd)
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break;
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if (i == ARRAY_SIZE(tty_ioctls)) {
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printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
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__func__, tty->name, cmd);
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}
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ret = -ENOIOCTLCMD;
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break;
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}
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return ret;
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}
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void line_throttle(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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deactivate_chan(&line->chan_list, line->driver->read_irq);
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line->throttled = 1;
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}
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void line_unthrottle(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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line->throttled = 0;
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chan_interrupt(&line->chan_list, &line->task, tty,
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line->driver->read_irq);
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/*
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* Maybe there is enough stuff pending that calling the interrupt
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* throttles us again. In this case, line->throttled will be 1
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* again and we shouldn't turn the interrupt back on.
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*/
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if (!line->throttled)
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reactivate_chan(&line->chan_list, line->driver->read_irq);
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}
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static irqreturn_t line_write_interrupt(int irq, void *data)
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{
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struct chan *chan = data;
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struct line *line = chan->line;
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struct tty_struct *tty = line->tty;
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int err;
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/*
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* Interrupts are disabled here because we registered the interrupt with
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* IRQF_DISABLED (see line_setup_irq).
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*/
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spin_lock(&line->lock);
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err = flush_buffer(line);
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if (err == 0) {
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return IRQ_NONE;
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} else if (err < 0) {
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line->head = line->buffer;
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line->tail = line->buffer;
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}
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spin_unlock(&line->lock);
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if (tty == NULL)
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return IRQ_NONE;
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tty_wakeup(tty);
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return IRQ_HANDLED;
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}
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int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
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{
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const struct line_driver *driver = line->driver;
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int err = 0, flags = IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM;
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if (input)
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err = um_request_irq(driver->read_irq, fd, IRQ_READ,
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line_interrupt, flags,
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driver->read_irq_name, data);
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if (err)
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return err;
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if (output)
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err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
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line_write_interrupt, flags,
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driver->write_irq_name, data);
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line->have_irq = 1;
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return err;
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}
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/*
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* Normally, a driver like this can rely mostly on the tty layer
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* locking, particularly when it comes to the driver structure.
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* However, in this case, mconsole requests can come in "from the
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* side", and race with opens and closes.
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*
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* mconsole config requests will want to be sure the device isn't in
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* use, and get_config, open, and close will want a stable
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* configuration. The checking and modification of the configuration
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* is done under a spinlock. Checking whether the device is in use is
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* line->tty->count > 1, also under the spinlock.
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*
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* tty->count serves to decide whether the device should be enabled or
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* disabled on the host. If it's equal to 1, then we are doing the
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* first open or last close. Otherwise, open and close just return.
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*/
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int line_open(struct line *lines, struct tty_struct *tty)
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{
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struct line *line = &lines[tty->index];
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int err = -ENODEV;
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spin_lock(&line->count_lock);
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if (!line->valid)
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goto out_unlock;
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err = 0;
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if (tty->count > 1)
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goto out_unlock;
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spin_unlock(&line->count_lock);
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tty->driver_data = line;
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line->tty = tty;
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err = enable_chan(line);
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if (err)
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return err;
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INIT_DELAYED_WORK(&line->task, line_timer_cb);
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if (!line->sigio) {
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chan_enable_winch(&line->chan_list, tty);
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line->sigio = 1;
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}
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chan_window_size(&line->chan_list, &tty->winsize.ws_row,
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&tty->winsize.ws_col);
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return err;
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out_unlock:
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spin_unlock(&line->count_lock);
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return err;
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}
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static void unregister_winch(struct tty_struct *tty);
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void line_close(struct tty_struct *tty, struct file * filp)
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{
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struct line *line = tty->driver_data;
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/*
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* If line_open fails (and tty->driver_data is never set),
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* tty_open will call line_close. So just return in this case.
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*/
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if (line == NULL)
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return;
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/* We ignore the error anyway! */
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flush_buffer(line);
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spin_lock(&line->count_lock);
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if (!line->valid)
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goto out_unlock;
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if (tty->count > 1)
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goto out_unlock;
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spin_unlock(&line->count_lock);
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line->tty = NULL;
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tty->driver_data = NULL;
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if (line->sigio) {
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unregister_winch(tty);
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line->sigio = 0;
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}
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return;
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out_unlock:
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spin_unlock(&line->count_lock);
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}
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void close_lines(struct line *lines, int nlines)
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{
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int i;
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for(i = 0; i < nlines; i++)
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close_chan(&lines[i].chan_list, 0);
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}
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static int setup_one_line(struct line *lines, int n, char *init, int init_prio,
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char **error_out)
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{
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struct line *line = &lines[n];
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int err = -EINVAL;
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spin_lock(&line->count_lock);
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if (line->tty != NULL) {
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*error_out = "Device is already open";
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goto out;
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}
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if (line->init_pri <= init_prio) {
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line->init_pri = init_prio;
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if (!strcmp(init, "none"))
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line->valid = 0;
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else {
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line->init_str = init;
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line->valid = 1;
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}
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}
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err = 0;
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out:
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spin_unlock(&line->count_lock);
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return err;
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}
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/*
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* Common setup code for both startup command line and mconsole initialization.
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* @lines contains the array (of size @num) to modify;
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* @init is the setup string;
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* @error_out is an error string in the case of failure;
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*/
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int line_setup(struct line *lines, unsigned int num, char *init,
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char **error_out)
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{
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int i, n, err;
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char *end;
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if (*init == '=') {
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/*
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* We said con=/ssl= instead of con#=, so we are configuring all
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* consoles at once.
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*/
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n = -1;
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}
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else {
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n = simple_strtoul(init, &end, 0);
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if (*end != '=') {
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*error_out = "Couldn't parse device number";
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return -EINVAL;
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}
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init = end;
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}
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init++;
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if (n >= (signed int) num) {
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*error_out = "Device number out of range";
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return -EINVAL;
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}
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else if (n >= 0) {
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err = setup_one_line(lines, n, init, INIT_ONE, error_out);
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if (err)
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return err;
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}
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else {
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for(i = 0; i < num; i++) {
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err = setup_one_line(lines, i, init, INIT_ALL,
|
|
error_out);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
return n == -1 ? num : n;
|
|
}
|
|
|
|
int line_config(struct line *lines, unsigned int num, char *str,
|
|
const struct chan_opts *opts, char **error_out)
|
|
{
|
|
struct line *line;
|
|
char *new;
|
|
int n;
|
|
|
|
if (*str == '=') {
|
|
*error_out = "Can't configure all devices from mconsole";
|
|
return -EINVAL;
|
|
}
|
|
|
|
new = kstrdup(str, GFP_KERNEL);
|
|
if (new == NULL) {
|
|
*error_out = "Failed to allocate memory";
|
|
return -ENOMEM;
|
|
}
|
|
n = line_setup(lines, num, new, error_out);
|
|
if (n < 0)
|
|
return n;
|
|
|
|
line = &lines[n];
|
|
return parse_chan_pair(line->init_str, line, n, opts, error_out);
|
|
}
|
|
|
|
int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
|
|
int size, char **error_out)
|
|
{
|
|
struct line *line;
|
|
char *end;
|
|
int dev, n = 0;
|
|
|
|
dev = simple_strtoul(name, &end, 0);
|
|
if ((*end != '\0') || (end == name)) {
|
|
*error_out = "line_get_config failed to parse device number";
|
|
return 0;
|
|
}
|
|
|
|
if ((dev < 0) || (dev >= num)) {
|
|
*error_out = "device number out of range";
|
|
return 0;
|
|
}
|
|
|
|
line = &lines[dev];
|
|
|
|
spin_lock(&line->count_lock);
|
|
if (!line->valid)
|
|
CONFIG_CHUNK(str, size, n, "none", 1);
|
|
else if (line->tty == NULL)
|
|
CONFIG_CHUNK(str, size, n, line->init_str, 1);
|
|
else n = chan_config_string(&line->chan_list, str, size, error_out);
|
|
spin_unlock(&line->count_lock);
|
|
|
|
return n;
|
|
}
|
|
|
|
int line_id(char **str, int *start_out, int *end_out)
|
|
{
|
|
char *end;
|
|
int n;
|
|
|
|
n = simple_strtoul(*str, &end, 0);
|
|
if ((*end != '\0') || (end == *str))
|
|
return -1;
|
|
|
|
*str = end;
|
|
*start_out = n;
|
|
*end_out = n;
|
|
return n;
|
|
}
|
|
|
|
int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
|
|
{
|
|
int err;
|
|
char config[sizeof("conxxxx=none\0")];
|
|
|
|
sprintf(config, "%d=none", n);
|
|
err = line_setup(lines, num, config, error_out);
|
|
if (err >= 0)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
struct tty_driver *register_lines(struct line_driver *line_driver,
|
|
const struct tty_operations *ops,
|
|
struct line *lines, int nlines)
|
|
{
|
|
int i;
|
|
struct tty_driver *driver = alloc_tty_driver(nlines);
|
|
|
|
if (!driver)
|
|
return NULL;
|
|
|
|
driver->driver_name = line_driver->name;
|
|
driver->name = line_driver->device_name;
|
|
driver->major = line_driver->major;
|
|
driver->minor_start = line_driver->minor_start;
|
|
driver->type = line_driver->type;
|
|
driver->subtype = line_driver->subtype;
|
|
driver->flags = TTY_DRIVER_REAL_RAW;
|
|
driver->init_termios = tty_std_termios;
|
|
tty_set_operations(driver, ops);
|
|
|
|
if (tty_register_driver(driver)) {
|
|
printk(KERN_ERR "register_lines : can't register %s driver\n",
|
|
line_driver->name);
|
|
put_tty_driver(driver);
|
|
return NULL;
|
|
}
|
|
|
|
for(i = 0; i < nlines; i++) {
|
|
if (!lines[i].valid)
|
|
tty_unregister_device(driver, i);
|
|
}
|
|
|
|
mconsole_register_dev(&line_driver->mc);
|
|
return driver;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(winch_handler_lock);
|
|
static LIST_HEAD(winch_handlers);
|
|
|
|
void lines_init(struct line *lines, int nlines, struct chan_opts *opts)
|
|
{
|
|
struct line *line;
|
|
char *error;
|
|
int i;
|
|
|
|
for(i = 0; i < nlines; i++) {
|
|
line = &lines[i];
|
|
INIT_LIST_HEAD(&line->chan_list);
|
|
|
|
if (line->init_str == NULL)
|
|
continue;
|
|
|
|
line->init_str = kstrdup(line->init_str, GFP_KERNEL);
|
|
if (line->init_str == NULL)
|
|
printk(KERN_ERR "lines_init - kstrdup returned NULL\n");
|
|
|
|
if (parse_chan_pair(line->init_str, line, i, opts, &error)) {
|
|
printk(KERN_ERR "parse_chan_pair failed for "
|
|
"device %d : %s\n", i, error);
|
|
line->valid = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
struct winch {
|
|
struct list_head list;
|
|
int fd;
|
|
int tty_fd;
|
|
int pid;
|
|
struct tty_struct *tty;
|
|
unsigned long stack;
|
|
};
|
|
|
|
static void free_winch(struct winch *winch, int free_irq_ok)
|
|
{
|
|
list_del(&winch->list);
|
|
|
|
if (winch->pid != -1)
|
|
os_kill_process(winch->pid, 1);
|
|
if (winch->fd != -1)
|
|
os_close_file(winch->fd);
|
|
if (winch->stack != 0)
|
|
free_stack(winch->stack, 0);
|
|
if (free_irq_ok)
|
|
free_irq(WINCH_IRQ, winch);
|
|
kfree(winch);
|
|
}
|
|
|
|
static irqreturn_t winch_interrupt(int irq, void *data)
|
|
{
|
|
struct winch *winch = data;
|
|
struct tty_struct *tty;
|
|
struct line *line;
|
|
int err;
|
|
char c;
|
|
|
|
if (winch->fd != -1) {
|
|
err = generic_read(winch->fd, &c, NULL);
|
|
if (err < 0) {
|
|
if (err != -EAGAIN) {
|
|
printk(KERN_ERR "winch_interrupt : "
|
|
"read failed, errno = %d\n", -err);
|
|
printk(KERN_ERR "fd %d is losing SIGWINCH "
|
|
"support\n", winch->tty_fd);
|
|
free_winch(winch, 0);
|
|
return IRQ_HANDLED;
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
tty = winch->tty;
|
|
if (tty != NULL) {
|
|
line = tty->driver_data;
|
|
if (line != NULL) {
|
|
chan_window_size(&line->chan_list, &tty->winsize.ws_row,
|
|
&tty->winsize.ws_col);
|
|
kill_pgrp(tty->pgrp, SIGWINCH, 1);
|
|
}
|
|
}
|
|
out:
|
|
if (winch->fd != -1)
|
|
reactivate_fd(winch->fd, WINCH_IRQ);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
|
|
unsigned long stack)
|
|
{
|
|
struct winch *winch;
|
|
|
|
winch = kmalloc(sizeof(*winch), GFP_KERNEL);
|
|
if (winch == NULL) {
|
|
printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
*winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
|
|
.fd = fd,
|
|
.tty_fd = tty_fd,
|
|
.pid = pid,
|
|
.tty = tty,
|
|
.stack = stack });
|
|
|
|
if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
|
|
IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
|
|
"winch", winch) < 0) {
|
|
printk(KERN_ERR "register_winch_irq - failed to register "
|
|
"IRQ\n");
|
|
goto out_free;
|
|
}
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
list_add(&winch->list, &winch_handlers);
|
|
spin_unlock(&winch_handler_lock);
|
|
|
|
return;
|
|
|
|
out_free:
|
|
kfree(winch);
|
|
cleanup:
|
|
os_kill_process(pid, 1);
|
|
os_close_file(fd);
|
|
if (stack != 0)
|
|
free_stack(stack, 0);
|
|
}
|
|
|
|
static void unregister_winch(struct tty_struct *tty)
|
|
{
|
|
struct list_head *ele;
|
|
struct winch *winch;
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
|
|
list_for_each(ele, &winch_handlers) {
|
|
winch = list_entry(ele, struct winch, list);
|
|
if (winch->tty == tty) {
|
|
free_winch(winch, 1);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&winch_handler_lock);
|
|
}
|
|
|
|
static void winch_cleanup(void)
|
|
{
|
|
struct list_head *ele, *next;
|
|
struct winch *winch;
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
|
|
list_for_each_safe(ele, next, &winch_handlers) {
|
|
winch = list_entry(ele, struct winch, list);
|
|
free_winch(winch, 1);
|
|
}
|
|
|
|
spin_unlock(&winch_handler_lock);
|
|
}
|
|
__uml_exitcall(winch_cleanup);
|
|
|
|
char *add_xterm_umid(char *base)
|
|
{
|
|
char *umid, *title;
|
|
int len;
|
|
|
|
umid = get_umid();
|
|
if (*umid == '\0')
|
|
return base;
|
|
|
|
len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
|
|
title = kmalloc(len, GFP_KERNEL);
|
|
if (title == NULL) {
|
|
printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
|
|
return base;
|
|
}
|
|
|
|
snprintf(title, len, "%s (%s)", base, umid);
|
|
return title;
|
|
}
|