mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 01:46:40 +07:00
2116bda6ad
The tty below tty_port might get destroyed by the tty layer while we hold a reference to it. So we have to carry tty_port around... Signed-off-by: Richard Weinberger <richard@nod.at>
586 lines
12 KiB
C
586 lines
12 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
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* Licensed under the GPL
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*/
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include "chan.h"
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#include <os.h>
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#include <irq_kern.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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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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static int open_one_chan(struct chan *chan)
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{
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int fd, err;
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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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err = os_set_fd_block(fd, 0);
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if (err) {
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(*chan->ops->close)(fd, chan->data);
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return err;
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}
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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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static 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 chan *chan, struct tty_port *port)
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{
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if (chan && chan->primary && chan->ops->winch)
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register_winch(chan->fd, port);
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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, line->driver->read_irq);
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}
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int 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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int err;
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INIT_DELAYED_WORK(&line->task, line_timer_cb);
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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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err = open_one_chan(chan);
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if (err) {
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if (chan->primary)
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goto out_close;
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continue;
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}
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if (chan->enabled)
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continue;
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err = line_setup_irq(chan->fd, chan->input, chan->output, line,
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chan);
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if (err)
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goto out_close;
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chan->enabled = 1;
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}
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return 0;
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out_close:
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close_chan(line);
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return err;
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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 && chan->enabled)
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um_free_irq(chan->line->driver->read_irq, chan);
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if (chan->output && chan->enabled)
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um_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 && chan->enabled)
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um_free_irq(chan->line->driver->read_irq, chan);
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if (chan->output && chan->enabled)
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um_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 line *line)
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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, &line->chan_list, list) {
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close_one_chan(chan, 0);
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}
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}
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void deactivate_chan(struct chan *chan, int irq)
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{
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if (chan && chan->enabled)
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deactivate_fd(chan->fd, irq);
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}
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void reactivate_chan(struct chan *chan, int irq)
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{
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if (chan && chan->enabled)
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reactivate_fd(chan->fd, irq);
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}
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int write_chan(struct chan *chan, const char *buf, int len,
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int write_irq)
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{
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int n, ret = 0;
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if (len == 0 || !chan || !chan->ops->write)
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return 0;
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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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return ret;
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}
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int console_write_chan(struct chan *chan, const char *buf, int len)
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{
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int n, ret = 0;
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if (!chan || !chan->ops->console_write)
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return 0;
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n = chan->ops->console_write(chan->fd, buf, len);
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if (chan->primary)
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ret = n;
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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(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
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co->index);
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return 0;
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}
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int chan_window_size(struct line *line, unsigned short *rows_out,
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unsigned short *cols_out)
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{
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struct chan *chan;
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chan = line->chan_in;
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if (chan && 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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chan = line->chan_out;
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if (chan && 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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return 0;
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}
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static void free_one_chan(struct chan *chan)
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{
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list_del(&chan->list);
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close_one_chan(chan, 0);
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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)
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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)
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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);
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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 line *line, char *str, int size,
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char **error_out)
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{
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struct chan *in = line->chan_in, *out = line->chan_out;
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if (in && !in->primary)
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in = NULL;
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if (out && !out->primary)
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out = NULL;
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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,
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.ops = ops,
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.data = data });
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return chan;
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}
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int parse_chan_pair(char *str, struct line *line, int device,
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const struct chan_opts *opts, char **error_out)
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{
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struct list_head *chans = &line->chan_list;
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struct chan *new;
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char *in, *out;
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if (!list_empty(chans)) {
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line->chan_in = line->chan_out = NULL;
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free_chan(chans);
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INIT_LIST_HEAD(chans);
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}
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if (!str)
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return 0;
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out = strchr(str, ',');
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if (out != NULL) {
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in = str;
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*out = '\0';
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out++;
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new = parse_chan(line, in, device, opts, error_out);
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if (new == NULL)
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return -1;
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new->input = 1;
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list_add(&new->list, chans);
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line->chan_in = new;
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new = parse_chan(line, out, device, opts, error_out);
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if (new == NULL)
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return -1;
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list_add(&new->list, chans);
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new->output = 1;
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line->chan_out = new;
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}
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else {
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new = parse_chan(line, str, device, opts, error_out);
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if (new == NULL)
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return -1;
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list_add(&new->list, chans);
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new->input = 1;
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new->output = 1;
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line->chan_in = line->chan_out = new;
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}
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return 0;
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}
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void chan_interrupt(struct line *line, int irq)
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{
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struct tty_port *port = &line->port;
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struct chan *chan = line->chan_in;
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int err;
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char c;
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if (!chan || !chan->ops->read)
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goto out;
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do {
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if (!tty_buffer_request_room(port, 1)) {
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schedule_delayed_work(&line->task, 1);
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goto out;
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}
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err = chan->ops->read(chan->fd, &c, chan->data);
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if (err > 0)
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tty_insert_flip_char(port, c, TTY_NORMAL);
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|
} while (err > 0);
|
|
|
|
if (err == 0)
|
|
reactivate_fd(chan->fd, irq);
|
|
if (err == -EIO) {
|
|
if (chan->primary) {
|
|
struct tty_struct *tty = tty_port_tty_get(&line->port);
|
|
if (tty != NULL) {
|
|
tty_hangup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
if (line->chan_out != chan)
|
|
close_one_chan(line->chan_out, 1);
|
|
}
|
|
close_one_chan(chan, 1);
|
|
if (chan->primary)
|
|
return;
|
|
}
|
|
out:
|
|
tty_flip_buffer_push(port);
|
|
}
|