![Jeff Dike](/assets/img/avatar_default.png)
Rename os_{read_write}_file_k back to os_{read_write}_file, delete the originals and their bogus infrastructure, and fix all the callers. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
660 lines
14 KiB
C
660 lines
14 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/tty_flip.h>
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#include <asm/irq.h>
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#include "chan_kern.h"
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#include "kern.h"
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#include "irq_user.h"
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#include "sigio.h"
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#include "line.h"
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#include "os.h"
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#ifdef CONFIG_NOCONFIG_CHAN
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static void *not_configged_init(char *str, int device,
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const struct chan_opts *opts)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return NULL;
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}
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static int not_configged_open(int input, int output, int primary, void *data,
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char **dev_out)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return -ENODEV;
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}
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static void not_configged_close(int fd, void *data)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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}
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static int not_configged_read(int fd, char *c_out, void *data)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return -EIO;
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}
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static int not_configged_write(int fd, const char *buf, int len, void *data)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return -EIO;
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}
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static int not_configged_console_write(int fd, const char *buf, int len)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return -EIO;
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}
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static int not_configged_window_size(int fd, void *data, unsigned short *rows,
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unsigned short *cols)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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return -ENODEV;
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}
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static void not_configged_free(void *data)
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{
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printk("Using a channel type which is configured out of "
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"UML\n");
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}
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static const struct chan_ops not_configged_ops = {
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.init = not_configged_init,
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.open = not_configged_open,
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.close = not_configged_close,
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.read = not_configged_read,
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.write = not_configged_write,
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.console_write = not_configged_console_write,
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.window_size = not_configged_window_size,
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.free = not_configged_free,
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.winch = 0,
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};
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#endif /* CONFIG_NOCONFIG_CHAN */
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void generic_close(int fd, void *unused)
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{
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os_close_file(fd);
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}
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int generic_read(int fd, char *c_out, void *unused)
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{
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int n;
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n = os_read_file(fd, c_out, sizeof(*c_out));
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if(n == -EAGAIN)
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return 0;
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else if(n == 0)
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return -EIO;
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return n;
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}
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/* XXX Trivial wrapper around os_write_file */
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int generic_write(int fd, const char *buf, int n, void *unused)
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{
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return os_write_file(fd, buf, n);
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}
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int generic_window_size(int fd, void *unused, unsigned short *rows_out,
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unsigned short *cols_out)
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{
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int rows, cols;
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int ret;
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ret = os_window_size(fd, &rows, &cols);
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if(ret < 0)
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return ret;
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ret = ((*rows_out != rows) || (*cols_out != cols));
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*rows_out = rows;
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*cols_out = cols;
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return ret;
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}
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void generic_free(void *data)
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{
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kfree(data);
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}
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static void tty_receive_char(struct tty_struct *tty, char ch)
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{
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if(tty == NULL) return;
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if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
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if(ch == STOP_CHAR(tty)){
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stop_tty(tty);
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return;
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}
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else if(ch == START_CHAR(tty)){
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start_tty(tty);
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return;
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}
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}
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tty_insert_flip_char(tty, ch, TTY_NORMAL);
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}
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static int open_one_chan(struct chan *chan)
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{
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int fd;
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if(chan->opened)
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return 0;
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if(chan->ops->open == NULL)
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fd = 0;
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else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
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chan->data, &chan->dev);
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if(fd < 0)
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return fd;
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chan->fd = fd;
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chan->opened = 1;
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return 0;
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}
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int open_chan(struct list_head *chans)
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{
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struct list_head *ele;
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struct chan *chan;
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int ret, err = 0;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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ret = open_one_chan(chan);
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if(chan->primary)
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err = ret;
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}
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return err;
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}
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void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(chan->primary && chan->output && chan->ops->winch){
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register_winch(chan->fd, tty);
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return;
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}
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}
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}
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void enable_chan(struct line *line)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, &line->chan_list){
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chan = list_entry(ele, struct chan, list);
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if(open_one_chan(chan))
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continue;
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if(chan->enabled)
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continue;
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line_setup_irq(chan->fd, chan->input, chan->output, line,
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chan);
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chan->enabled = 1;
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}
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}
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/* Items are added in IRQ context, when free_irq can't be called, and
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* removed in process context, when it can.
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* This handles interrupt sources which disappear, and which need to
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* be permanently disabled. This is discovered in IRQ context, but
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* the freeing of the IRQ must be done later.
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*/
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static DEFINE_SPINLOCK(irqs_to_free_lock);
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static LIST_HEAD(irqs_to_free);
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void free_irqs(void)
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{
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struct chan *chan;
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LIST_HEAD(list);
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struct list_head *ele;
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unsigned long flags;
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spin_lock_irqsave(&irqs_to_free_lock, flags);
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list_splice_init(&irqs_to_free, &list);
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spin_unlock_irqrestore(&irqs_to_free_lock, flags);
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list_for_each(ele, &list){
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chan = list_entry(ele, struct chan, free_list);
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if(chan->input)
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free_irq(chan->line->driver->read_irq, chan);
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if(chan->output)
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free_irq(chan->line->driver->write_irq, chan);
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chan->enabled = 0;
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}
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}
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static void close_one_chan(struct chan *chan, int delay_free_irq)
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{
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unsigned long flags;
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if(!chan->opened)
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return;
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if(delay_free_irq){
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spin_lock_irqsave(&irqs_to_free_lock, flags);
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list_add(&chan->free_list, &irqs_to_free);
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spin_unlock_irqrestore(&irqs_to_free_lock, flags);
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}
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else {
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if(chan->input)
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free_irq(chan->line->driver->read_irq, chan);
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if(chan->output)
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free_irq(chan->line->driver->write_irq, chan);
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chan->enabled = 0;
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}
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if(chan->ops->close != NULL)
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(*chan->ops->close)(chan->fd, chan->data);
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chan->opened = 0;
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chan->fd = -1;
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}
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void close_chan(struct list_head *chans, int delay_free_irq)
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{
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struct chan *chan;
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/* Close in reverse order as open in case more than one of them
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* refers to the same device and they save and restore that device's
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* state. Then, the first one opened will have the original state,
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* so it must be the last closed.
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*/
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list_for_each_entry_reverse(chan, chans, list) {
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close_one_chan(chan, delay_free_irq);
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}
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}
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void deactivate_chan(struct list_head *chans, int irq)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans) {
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chan = list_entry(ele, struct chan, list);
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if(chan->enabled && chan->input)
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deactivate_fd(chan->fd, irq);
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}
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}
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void reactivate_chan(struct list_head *chans, int irq)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans) {
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chan = list_entry(ele, struct chan, list);
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if(chan->enabled && chan->input)
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reactivate_fd(chan->fd, irq);
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}
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}
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int write_chan(struct list_head *chans, const char *buf, int len,
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int write_irq)
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{
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struct list_head *ele;
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struct chan *chan = NULL;
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int n, ret = 0;
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list_for_each(ele, chans) {
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chan = list_entry(ele, struct chan, list);
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if (!chan->output || (chan->ops->write == NULL))
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continue;
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n = chan->ops->write(chan->fd, buf, len, chan->data);
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if (chan->primary) {
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ret = n;
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if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
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reactivate_fd(chan->fd, write_irq);
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}
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}
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return ret;
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}
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int console_write_chan(struct list_head *chans, const char *buf, int len)
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{
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struct list_head *ele;
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struct chan *chan;
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int n, ret = 0;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->output || (chan->ops->console_write == NULL))
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continue;
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n = chan->ops->console_write(chan->fd, buf, len);
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if(chan->primary) ret = n;
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}
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return ret;
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}
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int console_open_chan(struct line *line, struct console *co)
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{
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int err;
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err = open_chan(&line->chan_list);
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if(err)
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return err;
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printk("Console initialized on /dev/%s%d\n", co->name, co->index);
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return 0;
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}
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int chan_window_size(struct list_head *chans, unsigned short *rows_out,
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unsigned short *cols_out)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(chan->primary){
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if(chan->ops->window_size == NULL)
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return 0;
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return chan->ops->window_size(chan->fd, chan->data,
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rows_out, cols_out);
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}
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}
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return 0;
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}
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static void free_one_chan(struct chan *chan, int delay_free_irq)
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{
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list_del(&chan->list);
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close_one_chan(chan, delay_free_irq);
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if(chan->ops->free != NULL)
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(*chan->ops->free)(chan->data);
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if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
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kfree(chan);
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}
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static void free_chan(struct list_head *chans, int delay_free_irq)
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{
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struct list_head *ele, *next;
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struct chan *chan;
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list_for_each_safe(ele, next, chans){
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chan = list_entry(ele, struct chan, list);
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free_one_chan(chan, delay_free_irq);
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}
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}
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static int one_chan_config_string(struct chan *chan, char *str, int size,
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char **error_out)
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{
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int n = 0;
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if(chan == NULL){
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CONFIG_CHUNK(str, size, n, "none", 1);
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return n;
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}
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CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
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if(chan->dev == NULL){
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CONFIG_CHUNK(str, size, n, "", 1);
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return n;
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}
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CONFIG_CHUNK(str, size, n, ":", 0);
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CONFIG_CHUNK(str, size, n, chan->dev, 0);
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return n;
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}
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static int chan_pair_config_string(struct chan *in, struct chan *out,
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char *str, int size, char **error_out)
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{
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int n;
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n = one_chan_config_string(in, str, size, error_out);
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str += n;
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size -= n;
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if(in == out){
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CONFIG_CHUNK(str, size, n, "", 1);
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return n;
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}
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CONFIG_CHUNK(str, size, n, ",", 1);
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n = one_chan_config_string(out, str, size, error_out);
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str += n;
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size -= n;
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CONFIG_CHUNK(str, size, n, "", 1);
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return n;
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}
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int chan_config_string(struct list_head *chans, char *str, int size,
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char **error_out)
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{
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struct list_head *ele;
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struct chan *chan, *in = NULL, *out = NULL;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->primary)
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continue;
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if(chan->input)
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in = chan;
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if(chan->output)
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out = chan;
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}
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return chan_pair_config_string(in, out, str, size, error_out);
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}
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struct chan_type {
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char *key;
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const struct chan_ops *ops;
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};
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static const struct chan_type chan_table[] = {
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{ "fd", &fd_ops },
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#ifdef CONFIG_NULL_CHAN
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{ "null", &null_ops },
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#else
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{ "null", ¬_configged_ops },
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#endif
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#ifdef CONFIG_PORT_CHAN
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{ "port", &port_ops },
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#else
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{ "port", ¬_configged_ops },
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#endif
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#ifdef CONFIG_PTY_CHAN
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{ "pty", &pty_ops },
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{ "pts", &pts_ops },
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#else
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{ "pty", ¬_configged_ops },
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{ "pts", ¬_configged_ops },
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#endif
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#ifdef CONFIG_TTY_CHAN
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{ "tty", &tty_ops },
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#else
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{ "tty", ¬_configged_ops },
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#endif
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#ifdef CONFIG_XTERM_CHAN
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{ "xterm", &xterm_ops },
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#else
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{ "xterm", ¬_configged_ops },
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#endif
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};
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static struct chan *parse_chan(struct line *line, char *str, int device,
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const struct chan_opts *opts, char **error_out)
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{
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const struct chan_type *entry;
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const struct chan_ops *ops;
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struct chan *chan;
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void *data;
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int i;
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ops = NULL;
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data = NULL;
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for(i = 0; i < ARRAY_SIZE(chan_table); i++){
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entry = &chan_table[i];
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if(!strncmp(str, entry->key, strlen(entry->key))){
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ops = entry->ops;
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str += strlen(entry->key);
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break;
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}
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}
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if(ops == NULL){
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*error_out = "No match for configured backends";
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return NULL;
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}
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data = (*ops->init)(str, device, opts);
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if(data == NULL){
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*error_out = "Configuration failed";
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return NULL;
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}
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chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
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if(chan == NULL){
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*error_out = "Memory allocation failed";
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return NULL;
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}
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*chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
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.free_list =
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LIST_HEAD_INIT(chan->free_list),
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.line = line,
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.primary = 1,
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.input = 0,
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.output = 0,
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.opened = 0,
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.enabled = 0,
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|
.fd = -1,
|
|
.ops = ops,
|
|
.data = data });
|
|
return chan;
|
|
}
|
|
|
|
int parse_chan_pair(char *str, struct line *line, int device,
|
|
const struct chan_opts *opts, char **error_out)
|
|
{
|
|
struct list_head *chans = &line->chan_list;
|
|
struct chan *new, *chan;
|
|
char *in, *out;
|
|
|
|
if(!list_empty(chans)){
|
|
chan = list_entry(chans->next, struct chan, list);
|
|
free_chan(chans, 0);
|
|
INIT_LIST_HEAD(chans);
|
|
}
|
|
|
|
out = strchr(str, ',');
|
|
if(out != NULL){
|
|
in = str;
|
|
*out = '\0';
|
|
out++;
|
|
new = parse_chan(line, in, device, opts, error_out);
|
|
if(new == NULL)
|
|
return -1;
|
|
|
|
new->input = 1;
|
|
list_add(&new->list, chans);
|
|
|
|
new = parse_chan(line, out, device, opts, error_out);
|
|
if(new == NULL)
|
|
return -1;
|
|
|
|
list_add(&new->list, chans);
|
|
new->output = 1;
|
|
}
|
|
else {
|
|
new = parse_chan(line, str, device, opts, error_out);
|
|
if(new == NULL)
|
|
return -1;
|
|
|
|
list_add(&new->list, chans);
|
|
new->input = 1;
|
|
new->output = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int chan_out_fd(struct list_head *chans)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(chan->primary && chan->output)
|
|
return chan->fd;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
void chan_interrupt(struct list_head *chans, struct delayed_work *task,
|
|
struct tty_struct *tty, int irq)
|
|
{
|
|
struct list_head *ele, *next;
|
|
struct chan *chan;
|
|
int err;
|
|
char c;
|
|
|
|
list_for_each_safe(ele, next, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(!chan->input || (chan->ops->read == NULL)) continue;
|
|
do {
|
|
if (tty && !tty_buffer_request_room(tty, 1)) {
|
|
schedule_delayed_work(task, 1);
|
|
goto out;
|
|
}
|
|
err = chan->ops->read(chan->fd, &c, chan->data);
|
|
if(err > 0)
|
|
tty_receive_char(tty, c);
|
|
} while(err > 0);
|
|
|
|
if(err == 0) reactivate_fd(chan->fd, irq);
|
|
if(err == -EIO){
|
|
if(chan->primary){
|
|
if(tty != NULL)
|
|
tty_hangup(tty);
|
|
close_chan(chans, 1);
|
|
return;
|
|
}
|
|
else close_one_chan(chan, 1);
|
|
}
|
|
}
|
|
out:
|
|
if(tty) tty_flip_buffer_push(tty);
|
|
}
|