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![Alex Dewar](/assets/img/avatar_default.png)
Convert files to use SPDX header. All files are licensed under the GPLv2. Signed-off-by: Alex Dewar <alex.dewar@gmx.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
759 lines
16 KiB
C
759 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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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 <linux/sched/signal.h>
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#include <linux/slab.h>
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#include "chan.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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if (line)
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chan_interrupt(line, irq);
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return IRQ_HANDLED;
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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_out, 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_out, 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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spin_lock_irqsave(&line->lock, flags);
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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_out, 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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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_in, 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, 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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int err;
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/*
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* Interrupts are disabled here because genirq keep irqs disabled when
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* calling the action handler.
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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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spin_unlock(&line->lock);
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return IRQ_NONE;
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} else if ((err < 0) && (err != -EAGAIN)) {
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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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tty_port_tty_wakeup(&line->port);
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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;
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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, IRQF_SHARED,
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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, IRQF_SHARED,
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driver->write_irq_name, data);
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return err;
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}
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static int line_activate(struct tty_port *port, struct tty_struct *tty)
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{
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int ret;
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struct line *line = tty->driver_data;
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ret = enable_chan(line);
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if (ret)
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return ret;
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if (!line->sigio) {
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chan_enable_winch(line->chan_out, port);
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line->sigio = 1;
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}
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chan_window_size(line, &tty->winsize.ws_row,
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&tty->winsize.ws_col);
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return 0;
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}
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static void unregister_winch(struct tty_struct *tty);
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static void line_destruct(struct tty_port *port)
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{
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struct tty_struct *tty = tty_port_tty_get(port);
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struct line *line = tty->driver_data;
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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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}
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static const struct tty_port_operations line_port_ops = {
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.activate = line_activate,
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.destruct = line_destruct,
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};
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int line_open(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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return tty_port_open(&line->port, tty, filp);
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}
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int line_install(struct tty_driver *driver, struct tty_struct *tty,
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struct line *line)
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{
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int ret;
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ret = tty_standard_install(driver, tty);
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if (ret)
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return ret;
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tty->driver_data = line;
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return 0;
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}
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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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tty_port_close(&line->port, tty, filp);
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}
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void line_hangup(struct tty_struct *tty)
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{
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struct line *line = tty->driver_data;
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tty_port_hangup(&line->port);
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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]);
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}
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int setup_one_line(struct line *lines, int n, char *init,
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const struct chan_opts *opts, char **error_out)
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{
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struct line *line = &lines[n];
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struct tty_driver *driver = line->driver->driver;
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int err = -EINVAL;
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if (line->port.count) {
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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 (!strcmp(init, "none")) {
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if (line->valid) {
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line->valid = 0;
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kfree(line->init_str);
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tty_unregister_device(driver, n);
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parse_chan_pair(NULL, line, n, opts, error_out);
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err = 0;
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}
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} else {
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char *new = kstrdup(init, GFP_KERNEL);
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if (!new) {
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*error_out = "Failed to allocate memory";
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return -ENOMEM;
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}
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if (line->valid) {
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tty_unregister_device(driver, n);
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kfree(line->init_str);
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}
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line->init_str = new;
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line->valid = 1;
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err = parse_chan_pair(new, line, n, opts, error_out);
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if (!err) {
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struct device *d = tty_port_register_device(&line->port,
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driver, n, NULL);
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if (IS_ERR(d)) {
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*error_out = "Failed to register device";
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err = PTR_ERR(d);
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parse_chan_pair(NULL, line, n, opts, error_out);
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}
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}
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if (err) {
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line->init_str = NULL;
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line->valid = 0;
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kfree(new);
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}
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}
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out:
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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(char **conf, unsigned int num, char **def,
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char *init, char *name)
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{
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char *error;
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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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*def = init + 1;
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} else {
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char *end;
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unsigned n = simple_strtoul(init, &end, 0);
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if (*end != '=') {
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error = "Couldn't parse device number";
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goto out;
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}
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if (n >= num) {
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error = "Device number out of range";
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goto out;
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}
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conf[n] = end + 1;
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}
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return 0;
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out:
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printk(KERN_ERR "Failed to set up %s with "
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"configuration string \"%s\" : %s\n", name, init, error);
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return -EINVAL;
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}
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int line_config(struct line *lines, unsigned int num, char *str,
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const struct chan_opts *opts, char **error_out)
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{
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char *end;
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int n;
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if (*str == '=') {
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*error_out = "Can't configure all devices from mconsole";
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return -EINVAL;
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}
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n = simple_strtoul(str, &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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if (n >= 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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return setup_one_line(lines, n, end, opts, error_out);
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}
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int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
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int size, char **error_out)
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{
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struct line *line;
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char *end;
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int dev, n = 0;
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dev = simple_strtoul(name, &end, 0);
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if ((*end != '\0') || (end == name)) {
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*error_out = "line_get_config failed to parse device number";
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return 0;
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}
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if ((dev < 0) || (dev >= num)) {
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*error_out = "device number out of range";
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return 0;
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}
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line = &lines[dev];
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if (!line->valid)
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CONFIG_CHUNK(str, size, n, "none", 1);
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else {
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struct tty_struct *tty = tty_port_tty_get(&line->port);
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if (tty == NULL) {
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CONFIG_CHUNK(str, size, n, line->init_str, 1);
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} else {
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n = chan_config_string(line, str, size, error_out);
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tty_kref_put(tty);
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}
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}
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return n;
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}
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int line_id(char **str, int *start_out, int *end_out)
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{
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char *end;
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int n;
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n = simple_strtoul(*str, &end, 0);
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if ((*end != '\0') || (end == *str))
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return -1;
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*str = end;
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*start_out = n;
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*end_out = n;
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return n;
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}
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int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
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{
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if (n >= 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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return setup_one_line(lines, n, "none", NULL, error_out);
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}
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int register_lines(struct line_driver *line_driver,
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const struct tty_operations *ops,
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struct line *lines, int nlines)
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{
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struct tty_driver *driver = alloc_tty_driver(nlines);
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int err;
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int i;
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if (!driver)
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return -ENOMEM;
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driver->driver_name = line_driver->name;
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driver->name = line_driver->device_name;
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driver->major = line_driver->major;
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driver->minor_start = line_driver->minor_start;
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driver->type = line_driver->type;
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driver->subtype = line_driver->subtype;
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driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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driver->init_termios = tty_std_termios;
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for (i = 0; i < nlines; i++) {
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tty_port_init(&lines[i].port);
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lines[i].port.ops = &line_port_ops;
|
|
spin_lock_init(&lines[i].lock);
|
|
lines[i].driver = line_driver;
|
|
INIT_LIST_HEAD(&lines[i].chan_list);
|
|
}
|
|
tty_set_operations(driver, ops);
|
|
|
|
err = tty_register_driver(driver);
|
|
if (err) {
|
|
printk(KERN_ERR "register_lines : can't register %s driver\n",
|
|
line_driver->name);
|
|
put_tty_driver(driver);
|
|
for (i = 0; i < nlines; i++)
|
|
tty_port_destroy(&lines[i].port);
|
|
return err;
|
|
}
|
|
|
|
line_driver->driver = driver;
|
|
mconsole_register_dev(&line_driver->mc);
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(winch_handler_lock);
|
|
static LIST_HEAD(winch_handlers);
|
|
|
|
struct winch {
|
|
struct list_head list;
|
|
int fd;
|
|
int tty_fd;
|
|
int pid;
|
|
struct tty_port *port;
|
|
unsigned long stack;
|
|
struct work_struct work;
|
|
};
|
|
|
|
static void __free_winch(struct work_struct *work)
|
|
{
|
|
struct winch *winch = container_of(work, struct winch, work);
|
|
um_free_irq(WINCH_IRQ, winch);
|
|
|
|
if (winch->pid != -1)
|
|
os_kill_process(winch->pid, 1);
|
|
if (winch->stack != 0)
|
|
free_stack(winch->stack, 0);
|
|
kfree(winch);
|
|
}
|
|
|
|
static void free_winch(struct winch *winch)
|
|
{
|
|
int fd = winch->fd;
|
|
winch->fd = -1;
|
|
if (fd != -1)
|
|
os_close_file(fd);
|
|
list_del(&winch->list);
|
|
__free_winch(&winch->work);
|
|
}
|
|
|
|
static irqreturn_t winch_interrupt(int irq, void *data)
|
|
{
|
|
struct winch *winch = data;
|
|
struct tty_struct *tty;
|
|
struct line *line;
|
|
int fd = winch->fd;
|
|
int err;
|
|
char c;
|
|
struct pid *pgrp;
|
|
|
|
if (fd != -1) {
|
|
err = generic_read(fd, &c, NULL);
|
|
if (err < 0) {
|
|
if (err != -EAGAIN) {
|
|
winch->fd = -1;
|
|
list_del(&winch->list);
|
|
os_close_file(fd);
|
|
printk(KERN_ERR "winch_interrupt : "
|
|
"read failed, errno = %d\n", -err);
|
|
printk(KERN_ERR "fd %d is losing SIGWINCH "
|
|
"support\n", winch->tty_fd);
|
|
INIT_WORK(&winch->work, __free_winch);
|
|
schedule_work(&winch->work);
|
|
return IRQ_HANDLED;
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
tty = tty_port_tty_get(winch->port);
|
|
if (tty != NULL) {
|
|
line = tty->driver_data;
|
|
if (line != NULL) {
|
|
chan_window_size(line, &tty->winsize.ws_row,
|
|
&tty->winsize.ws_col);
|
|
pgrp = tty_get_pgrp(tty);
|
|
if (pgrp)
|
|
kill_pgrp(pgrp, SIGWINCH, 1);
|
|
put_pid(pgrp);
|
|
}
|
|
tty_kref_put(tty);
|
|
}
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
|
|
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,
|
|
.port = port,
|
|
.stack = stack });
|
|
|
|
if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
|
|
IRQF_SHARED, "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, *next;
|
|
struct winch *winch;
|
|
struct tty_struct *wtty;
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
|
|
list_for_each_safe(ele, next, &winch_handlers) {
|
|
winch = list_entry(ele, struct winch, list);
|
|
wtty = tty_port_tty_get(winch->port);
|
|
if (wtty == tty) {
|
|
free_winch(winch);
|
|
break;
|
|
}
|
|
tty_kref_put(wtty);
|
|
}
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|