mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
89fe64766a
Move some code from a kernelspace file to a userspace file where it fits better. This enables some tidying which is the subject of a later patch. 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>
634 lines
13 KiB
C
634 lines
13 KiB
C
/*
|
|
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/string.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <asm/irq.h>
|
|
#include "chan_kern.h"
|
|
#include "kern.h"
|
|
#include "irq_user.h"
|
|
#include "sigio.h"
|
|
#include "line.h"
|
|
#include "os.h"
|
|
|
|
#ifdef CONFIG_NOCONFIG_CHAN
|
|
static void *not_configged_init(char *str, int device,
|
|
const struct chan_opts *opts)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return NULL;
|
|
}
|
|
|
|
static int not_configged_open(int input, int output, int primary, void *data,
|
|
char **dev_out)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void not_configged_close(int fd, void *data)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
}
|
|
|
|
static int not_configged_read(int fd, char *c_out, void *data)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return -EIO;
|
|
}
|
|
|
|
static int not_configged_write(int fd, const char *buf, int len, void *data)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return -EIO;
|
|
}
|
|
|
|
static int not_configged_console_write(int fd, const char *buf, int len)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return -EIO;
|
|
}
|
|
|
|
static int not_configged_window_size(int fd, void *data, unsigned short *rows,
|
|
unsigned short *cols)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void not_configged_free(void *data)
|
|
{
|
|
printk("Using a channel type which is configured out of "
|
|
"UML\n");
|
|
}
|
|
|
|
static const struct chan_ops not_configged_ops = {
|
|
.init = not_configged_init,
|
|
.open = not_configged_open,
|
|
.close = not_configged_close,
|
|
.read = not_configged_read,
|
|
.write = not_configged_write,
|
|
.console_write = not_configged_console_write,
|
|
.window_size = not_configged_window_size,
|
|
.free = not_configged_free,
|
|
.winch = 0,
|
|
};
|
|
#endif /* CONFIG_NOCONFIG_CHAN */
|
|
|
|
static void tty_receive_char(struct tty_struct *tty, char ch)
|
|
{
|
|
if(tty == NULL) return;
|
|
|
|
if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
|
|
if(ch == STOP_CHAR(tty)){
|
|
stop_tty(tty);
|
|
return;
|
|
}
|
|
else if(ch == START_CHAR(tty)){
|
|
start_tty(tty);
|
|
return;
|
|
}
|
|
}
|
|
|
|
tty_insert_flip_char(tty, ch, TTY_NORMAL);
|
|
}
|
|
|
|
static int open_one_chan(struct chan *chan)
|
|
{
|
|
int fd, err;
|
|
|
|
if(chan->opened)
|
|
return 0;
|
|
|
|
if(chan->ops->open == NULL)
|
|
fd = 0;
|
|
else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
|
|
chan->data, &chan->dev);
|
|
if(fd < 0)
|
|
return fd;
|
|
|
|
err = os_set_fd_block(fd, 0);
|
|
if (err) {
|
|
(*chan->ops->close)(fd, chan->data);
|
|
return err;
|
|
}
|
|
|
|
chan->fd = fd;
|
|
|
|
chan->opened = 1;
|
|
return 0;
|
|
}
|
|
|
|
int open_chan(struct list_head *chans)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
int ret, err = 0;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
ret = open_one_chan(chan);
|
|
if(chan->primary)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(chan->primary && chan->output && chan->ops->winch){
|
|
register_winch(chan->fd, tty);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
int enable_chan(struct line *line)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
int err;
|
|
|
|
list_for_each(ele, &line->chan_list){
|
|
chan = list_entry(ele, struct chan, list);
|
|
err = open_one_chan(chan);
|
|
if (err) {
|
|
if (chan->primary)
|
|
goto out_close;
|
|
|
|
continue;
|
|
}
|
|
|
|
if(chan->enabled)
|
|
continue;
|
|
err = line_setup_irq(chan->fd, chan->input, chan->output, line,
|
|
chan);
|
|
if (err)
|
|
goto out_close;
|
|
|
|
chan->enabled = 1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_close:
|
|
close_chan(&line->chan_list, 0);
|
|
return err;
|
|
}
|
|
|
|
/* Items are added in IRQ context, when free_irq can't be called, and
|
|
* removed in process context, when it can.
|
|
* This handles interrupt sources which disappear, and which need to
|
|
* be permanently disabled. This is discovered in IRQ context, but
|
|
* the freeing of the IRQ must be done later.
|
|
*/
|
|
static DEFINE_SPINLOCK(irqs_to_free_lock);
|
|
static LIST_HEAD(irqs_to_free);
|
|
|
|
void free_irqs(void)
|
|
{
|
|
struct chan *chan;
|
|
LIST_HEAD(list);
|
|
struct list_head *ele;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&irqs_to_free_lock, flags);
|
|
list_splice_init(&irqs_to_free, &list);
|
|
spin_unlock_irqrestore(&irqs_to_free_lock, flags);
|
|
|
|
list_for_each(ele, &list){
|
|
chan = list_entry(ele, struct chan, free_list);
|
|
|
|
if(chan->input)
|
|
free_irq(chan->line->driver->read_irq, chan);
|
|
if(chan->output)
|
|
free_irq(chan->line->driver->write_irq, chan);
|
|
chan->enabled = 0;
|
|
}
|
|
}
|
|
|
|
static void close_one_chan(struct chan *chan, int delay_free_irq)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if(!chan->opened)
|
|
return;
|
|
|
|
if(delay_free_irq){
|
|
spin_lock_irqsave(&irqs_to_free_lock, flags);
|
|
list_add(&chan->free_list, &irqs_to_free);
|
|
spin_unlock_irqrestore(&irqs_to_free_lock, flags);
|
|
}
|
|
else {
|
|
if(chan->input)
|
|
free_irq(chan->line->driver->read_irq, chan);
|
|
if(chan->output)
|
|
free_irq(chan->line->driver->write_irq, chan);
|
|
chan->enabled = 0;
|
|
}
|
|
if(chan->ops->close != NULL)
|
|
(*chan->ops->close)(chan->fd, chan->data);
|
|
|
|
chan->opened = 0;
|
|
chan->fd = -1;
|
|
}
|
|
|
|
void close_chan(struct list_head *chans, int delay_free_irq)
|
|
{
|
|
struct chan *chan;
|
|
|
|
/* Close in reverse order as open in case more than one of them
|
|
* refers to the same device and they save and restore that device's
|
|
* state. Then, the first one opened will have the original state,
|
|
* so it must be the last closed.
|
|
*/
|
|
list_for_each_entry_reverse(chan, chans, list) {
|
|
close_one_chan(chan, delay_free_irq);
|
|
}
|
|
}
|
|
|
|
void deactivate_chan(struct list_head *chans, int irq)
|
|
{
|
|
struct list_head *ele;
|
|
|
|
struct chan *chan;
|
|
list_for_each(ele, chans) {
|
|
chan = list_entry(ele, struct chan, list);
|
|
|
|
if(chan->enabled && chan->input)
|
|
deactivate_fd(chan->fd, irq);
|
|
}
|
|
}
|
|
|
|
void reactivate_chan(struct list_head *chans, int irq)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
|
|
list_for_each(ele, chans) {
|
|
chan = list_entry(ele, struct chan, list);
|
|
|
|
if(chan->enabled && chan->input)
|
|
reactivate_fd(chan->fd, irq);
|
|
}
|
|
}
|
|
|
|
int write_chan(struct list_head *chans, const char *buf, int len,
|
|
int write_irq)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan = NULL;
|
|
int n, ret = 0;
|
|
|
|
list_for_each(ele, chans) {
|
|
chan = list_entry(ele, struct chan, list);
|
|
if (!chan->output || (chan->ops->write == NULL))
|
|
continue;
|
|
n = chan->ops->write(chan->fd, buf, len, chan->data);
|
|
if (chan->primary) {
|
|
ret = n;
|
|
if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
|
|
reactivate_fd(chan->fd, write_irq);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int console_write_chan(struct list_head *chans, const char *buf, int len)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
int n, ret = 0;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(!chan->output || (chan->ops->console_write == NULL))
|
|
continue;
|
|
n = chan->ops->console_write(chan->fd, buf, len);
|
|
if(chan->primary) ret = n;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int console_open_chan(struct line *line, struct console *co)
|
|
{
|
|
int err;
|
|
|
|
err = open_chan(&line->chan_list);
|
|
if(err)
|
|
return err;
|
|
|
|
printk("Console initialized on /dev/%s%d\n", co->name, co->index);
|
|
return 0;
|
|
}
|
|
|
|
int chan_window_size(struct list_head *chans, unsigned short *rows_out,
|
|
unsigned short *cols_out)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(chan->primary){
|
|
if(chan->ops->window_size == NULL)
|
|
return 0;
|
|
return chan->ops->window_size(chan->fd, chan->data,
|
|
rows_out, cols_out);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void free_one_chan(struct chan *chan, int delay_free_irq)
|
|
{
|
|
list_del(&chan->list);
|
|
|
|
close_one_chan(chan, delay_free_irq);
|
|
|
|
if(chan->ops->free != NULL)
|
|
(*chan->ops->free)(chan->data);
|
|
|
|
if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
|
|
kfree(chan);
|
|
}
|
|
|
|
static void free_chan(struct list_head *chans, int delay_free_irq)
|
|
{
|
|
struct list_head *ele, *next;
|
|
struct chan *chan;
|
|
|
|
list_for_each_safe(ele, next, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
free_one_chan(chan, delay_free_irq);
|
|
}
|
|
}
|
|
|
|
static int one_chan_config_string(struct chan *chan, char *str, int size,
|
|
char **error_out)
|
|
{
|
|
int n = 0;
|
|
|
|
if(chan == NULL){
|
|
CONFIG_CHUNK(str, size, n, "none", 1);
|
|
return n;
|
|
}
|
|
|
|
CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
|
|
|
|
if(chan->dev == NULL){
|
|
CONFIG_CHUNK(str, size, n, "", 1);
|
|
return n;
|
|
}
|
|
|
|
CONFIG_CHUNK(str, size, n, ":", 0);
|
|
CONFIG_CHUNK(str, size, n, chan->dev, 0);
|
|
|
|
return n;
|
|
}
|
|
|
|
static int chan_pair_config_string(struct chan *in, struct chan *out,
|
|
char *str, int size, char **error_out)
|
|
{
|
|
int n;
|
|
|
|
n = one_chan_config_string(in, str, size, error_out);
|
|
str += n;
|
|
size -= n;
|
|
|
|
if(in == out){
|
|
CONFIG_CHUNK(str, size, n, "", 1);
|
|
return n;
|
|
}
|
|
|
|
CONFIG_CHUNK(str, size, n, ",", 1);
|
|
n = one_chan_config_string(out, str, size, error_out);
|
|
str += n;
|
|
size -= n;
|
|
CONFIG_CHUNK(str, size, n, "", 1);
|
|
|
|
return n;
|
|
}
|
|
|
|
int chan_config_string(struct list_head *chans, char *str, int size,
|
|
char **error_out)
|
|
{
|
|
struct list_head *ele;
|
|
struct chan *chan, *in = NULL, *out = NULL;
|
|
|
|
list_for_each(ele, chans){
|
|
chan = list_entry(ele, struct chan, list);
|
|
if(!chan->primary)
|
|
continue;
|
|
if(chan->input)
|
|
in = chan;
|
|
if(chan->output)
|
|
out = chan;
|
|
}
|
|
|
|
return chan_pair_config_string(in, out, str, size, error_out);
|
|
}
|
|
|
|
struct chan_type {
|
|
char *key;
|
|
const struct chan_ops *ops;
|
|
};
|
|
|
|
static const struct chan_type chan_table[] = {
|
|
{ "fd", &fd_ops },
|
|
|
|
#ifdef CONFIG_NULL_CHAN
|
|
{ "null", &null_ops },
|
|
#else
|
|
{ "null", ¬_configged_ops },
|
|
#endif
|
|
|
|
#ifdef CONFIG_PORT_CHAN
|
|
{ "port", &port_ops },
|
|
#else
|
|
{ "port", ¬_configged_ops },
|
|
#endif
|
|
|
|
#ifdef CONFIG_PTY_CHAN
|
|
{ "pty", &pty_ops },
|
|
{ "pts", &pts_ops },
|
|
#else
|
|
{ "pty", ¬_configged_ops },
|
|
{ "pts", ¬_configged_ops },
|
|
#endif
|
|
|
|
#ifdef CONFIG_TTY_CHAN
|
|
{ "tty", &tty_ops },
|
|
#else
|
|
{ "tty", ¬_configged_ops },
|
|
#endif
|
|
|
|
#ifdef CONFIG_XTERM_CHAN
|
|
{ "xterm", &xterm_ops },
|
|
#else
|
|
{ "xterm", ¬_configged_ops },
|
|
#endif
|
|
};
|
|
|
|
static struct chan *parse_chan(struct line *line, char *str, int device,
|
|
const struct chan_opts *opts, char **error_out)
|
|
{
|
|
const struct chan_type *entry;
|
|
const struct chan_ops *ops;
|
|
struct chan *chan;
|
|
void *data;
|
|
int i;
|
|
|
|
ops = NULL;
|
|
data = NULL;
|
|
for(i = 0; i < ARRAY_SIZE(chan_table); i++){
|
|
entry = &chan_table[i];
|
|
if(!strncmp(str, entry->key, strlen(entry->key))){
|
|
ops = entry->ops;
|
|
str += strlen(entry->key);
|
|
break;
|
|
}
|
|
}
|
|
if(ops == NULL){
|
|
*error_out = "No match for configured backends";
|
|
return NULL;
|
|
}
|
|
|
|
data = (*ops->init)(str, device, opts);
|
|
if(data == NULL){
|
|
*error_out = "Configuration failed";
|
|
return NULL;
|
|
}
|
|
|
|
chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
|
|
if(chan == NULL){
|
|
*error_out = "Memory allocation failed";
|
|
return NULL;
|
|
}
|
|
*chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
|
|
.free_list =
|
|
LIST_HEAD_INIT(chan->free_list),
|
|
.line = line,
|
|
.primary = 1,
|
|
.input = 0,
|
|
.output = 0,
|
|
.opened = 0,
|
|
.enabled = 0,
|
|
.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);
|
|
}
|