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Date: Sun, 12 Feb 2012 01:24:36 +0100
From: Richard Weinberger <richard@....at>
To: Richard Weinberger <richard@....at>
CC: linux-kernel@...r.kernel.org,
user-mode-linux-devel@...ts.sourceforge.net,
viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk, gregkh@...uxfoundation.org
Subject: [PATCH] um: Use tty_port
Whoops, I messed up the subject line.
Sorry!
Am 12.02.2012 01:21, schrieb Richard Weinberger:
> Can you please review this patch?
>
> Thanks,
> //richard
>
> ---
> From d8f5e7953def150bcc1e6a39dbbe589f1c68bcbd Mon Sep 17 00:00:00 2001
> From: Richard Weinberger <richard@....at>
> Date: Sun, 12 Feb 2012 01:12:49 +0100
> Subject: [PATCH] um: Use tty_port
>
> UML's line driver has to use tty_port.
>
> Signed-off-by: Richard Weinberger <richard@....at>
> ---
> arch/um/drivers/line.c | 212 +++++++++++---------------------------
> arch/um/drivers/line.h | 13 ++-
> arch/um/drivers/ssl.c | 16 +++-
> arch/um/drivers/stdio_console.c | 14 ++-
> 4 files changed, 94 insertions(+), 161 deletions(-)
>
> diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
> index c1cf220..c789748 100644
> --- a/arch/um/drivers/line.c
> +++ b/arch/um/drivers/line.c
> @@ -19,19 +19,29 @@ static irqreturn_t line_interrupt(int irq, void *data)
> {
> struct chan *chan = data;
> struct line *line = chan->line;
> + struct tty_struct *tty;
> +
> + if (line) {
> + tty = tty_port_tty_get(&line->port);
> + chan_interrupt(&line->chan_list, &line->task, tty, irq);
> + tty_kref_put(tty);
> + }
>
> - if (line)
> - chan_interrupt(&line->chan_list, &line->task, line->tty, irq);
> return IRQ_HANDLED;
> }
>
> static void line_timer_cb(struct work_struct *work)
> {
> struct line *line = container_of(work, struct line, task.work);
> + struct tty_struct *tty;
>
> - if (!line->throttled)
> - chan_interrupt(&line->chan_list, &line->task, line->tty,
> + if (!line->throttled) {
> + tty = tty_port_tty_get(&line->port);
> + chan_interrupt(&line->chan_list, &line->task, tty,
> line->driver->read_irq);
> +
> + tty_kref_put(tty);
> + }
> }
>
> /*
> @@ -228,92 +238,6 @@ void line_set_termios(struct tty_struct *tty, struct ktermios * old)
> /* nothing */
> }
>
> -static const struct {
> - int cmd;
> - char *level;
> - char *name;
> -} tty_ioctls[] = {
> - /* don't print these, they flood the log ... */
> - { TCGETS, NULL, "TCGETS" },
> - { TCSETS, NULL, "TCSETS" },
> - { TCSETSW, NULL, "TCSETSW" },
> - { TCFLSH, NULL, "TCFLSH" },
> - { TCSBRK, NULL, "TCSBRK" },
> -
> - /* general tty stuff */
> - { TCSETSF, KERN_DEBUG, "TCSETSF" },
> - { TCGETA, KERN_DEBUG, "TCGETA" },
> - { TIOCMGET, KERN_DEBUG, "TIOCMGET" },
> - { TCSBRKP, KERN_DEBUG, "TCSBRKP" },
> - { TIOCMSET, KERN_DEBUG, "TIOCMSET" },
> -
> - /* linux-specific ones */
> - { TIOCLINUX, KERN_INFO, "TIOCLINUX" },
> - { KDGKBMODE, KERN_INFO, "KDGKBMODE" },
> - { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" },
> - { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" },
> -};
> -
> -int line_ioctl(struct tty_struct *tty, unsigned int cmd,
> - unsigned long arg)
> -{
> - int ret;
> - int i;
> -
> - ret = 0;
> - switch(cmd) {
> -#ifdef TIOCGETP
> - case TIOCGETP:
> - case TIOCSETP:
> - case TIOCSETN:
> -#endif
> -#ifdef TIOCGETC
> - case TIOCGETC:
> - case TIOCSETC:
> -#endif
> -#ifdef TIOCGLTC
> - case TIOCGLTC:
> - case TIOCSLTC:
> -#endif
> - /* Note: these are out of date as we now have TCGETS2 etc but this
> - whole lot should probably go away */
> - case TCGETS:
> - case TCSETSF:
> - case TCSETSW:
> - case TCSETS:
> - case TCGETA:
> - case TCSETAF:
> - case TCSETAW:
> - case TCSETA:
> - case TCXONC:
> - case TCFLSH:
> - case TIOCOUTQ:
> - case TIOCINQ:
> - case TIOCGLCKTRMIOS:
> - case TIOCSLCKTRMIOS:
> - case TIOCPKT:
> - case TIOCGSOFTCAR:
> - case TIOCSSOFTCAR:
> - return -ENOIOCTLCMD;
> -#if 0
> - case TCwhatever:
> - /* do something */
> - break;
> -#endif
> - default:
> - for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
> - if (cmd == tty_ioctls[i].cmd)
> - break;
> - if (i == ARRAY_SIZE(tty_ioctls)) {
> - printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
> - __func__, tty->name, cmd);
> - }
> - ret = -ENOIOCTLCMD;
> - break;
> - }
> - return ret;
> -}
> -
> void line_throttle(struct tty_struct *tty)
> {
> struct line *line = tty->driver_data;
> @@ -343,7 +267,7 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
> {
> struct chan *chan = data;
> struct line *line = chan->line;
> - struct tty_struct *tty = line->tty;
> + struct tty_struct *tty = tty_port_tty_get(&line->port);
> int err;
>
> /*
> @@ -354,6 +278,9 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
> spin_lock(&line->lock);
> err = flush_buffer(line);
> if (err == 0) {
> + tty_kref_put(tty);
> +
> + spin_unlock(&line->lock);
> return IRQ_NONE;
> } else if (err < 0) {
> line->head = line->buffer;
> @@ -365,9 +292,12 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
> return IRQ_NONE;
>
> tty_wakeup(tty);
> + tty_kref_put(tty);
> return IRQ_HANDLED;
> }
>
> +static const struct tty_port_operations line_port_ops;
> +
> int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
> {
> const struct line_driver *driver = line->driver;
> @@ -404,27 +334,27 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
> * first open or last close. Otherwise, open and close just return.
> */
>
> -int line_open(struct line *lines, struct tty_struct *tty)
> +int line_open(struct tty_struct *tty, struct file *filp)
> {
> - struct line *line = &lines[tty->index];
> - int err = -ENODEV;
> + struct line *line = tty->driver_data;
> + return tty_port_open(&line->port, tty, filp);
> +}
>
> - spin_lock(&line->count_lock);
> - if (!line->valid)
> - goto out_unlock;
> +int line_install(struct tty_driver *driver, struct tty_struct *tty, struct line *line)
> +{
> + int ret = tty_init_termios(tty);
>
> - err = 0;
> - if (line->count++)
> - goto out_unlock;
> + if (ret)
> + return ret;
>
> - BUG_ON(tty->driver_data);
> + tty_driver_kref_get(driver);
> + tty->count++;
> tty->driver_data = line;
> - line->tty = tty;
> + driver->ttys[tty->index] = tty;
>
> - spin_unlock(&line->count_lock);
> - err = enable_chan(line);
> - if (err) /* line_close() will be called by our caller */
> - return err;
> + ret = enable_chan(line);
> + if (ret)
> + return ret;
>
> INIT_DELAYED_WORK(&line->task, line_timer_cb);
>
> @@ -437,48 +367,36 @@ int line_open(struct line *lines, struct tty_struct *tty)
> &tty->winsize.ws_col);
>
> return 0;
> -
> -out_unlock:
> - spin_unlock(&line->count_lock);
> - return err;
> }
>
> static void unregister_winch(struct tty_struct *tty);
>
> -void line_close(struct tty_struct *tty, struct file * filp)
> +void line_cleanup(struct tty_struct *tty)
> {
> struct line *line = tty->driver_data;
>
> - /*
> - * If line_open fails (and tty->driver_data is never set),
> - * tty_open will call line_close. So just return in this case.
> - */
> - if (line == NULL)
> - return;
> -
> - /* We ignore the error anyway! */
> - flush_buffer(line);
> -
> - spin_lock(&line->count_lock);
> - BUG_ON(!line->valid);
> -
> - if (--line->count)
> - goto out_unlock;
> -
> - line->tty = NULL;
> - tty->driver_data = NULL;
> -
> - spin_unlock(&line->count_lock);
> -
> if (line->sigio) {
> unregister_winch(tty);
> line->sigio = 0;
> }
>
> - return;
> + tty->driver_data = NULL;
> +}
> +
> +void line_close(struct tty_struct *tty, struct file * filp)
> +{
> + struct line *line = tty->driver_data;
> +
> + if (!line)
> + return;
> +
> + tty_port_close(&line->port, tty, filp);
> +}
>
> -out_unlock:
> - spin_unlock(&line->count_lock);
> +void line_hangup(struct tty_struct *tty)
> +{
> + struct line *line = tty->driver_data;
> + tty_port_hangup(&line->port);
> }
>
> void close_lines(struct line *lines, int nlines)
> @@ -495,13 +413,6 @@ static int setup_one_line(struct line *lines, int n, char *init, int init_prio,
> struct line *line = &lines[n];
> int err = -EINVAL;
>
> - spin_lock(&line->count_lock);
> -
> - if (line->count) {
> - *error_out = "Device is already open";
> - goto out;
> - }
> -
> if (line->init_pri <= init_prio) {
> line->init_pri = init_prio;
> if (!strcmp(init, "none"))
> @@ -512,8 +423,7 @@ static int setup_one_line(struct line *lines, int n, char *init, int init_prio,
> }
> }
> err = 0;
> -out:
> - spin_unlock(&line->count_lock);
> +
> return err;
> }
>
> @@ -598,6 +508,7 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
> struct line *line;
> char *end;
> int dev, n = 0;
> + struct tty_struct *tty;
>
> dev = simple_strtoul(name, &end, 0);
> if ((*end != '\0') || (end == name)) {
> @@ -612,13 +523,15 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
>
> line = &lines[dev];
>
> - spin_lock(&line->count_lock);
> + tty = tty_port_tty_get(&line->port);
> +
> if (!line->valid)
> CONFIG_CHUNK(str, size, n, "none", 1);
> - else if (line->tty == NULL)
> + else if (tty == NULL)
> CONFIG_CHUNK(str, size, n, line->init_str, 1);
> else n = chan_config_string(&line->chan_list, str, size, error_out);
> - spin_unlock(&line->count_lock);
> +
> + tty_kref_put(tty);
>
> return n;
> }
> @@ -678,8 +591,8 @@ struct tty_driver *register_lines(struct line_driver *line_driver,
> }
>
> for(i = 0; i < nlines; i++) {
> - if (!lines[i].valid)
> - tty_unregister_device(driver, i);
> + tty_port_init(&lines[i].port);
> + lines[i].port.ops = &line_port_ops;
> }
>
> mconsole_register_dev(&line_driver->mc);
> @@ -805,7 +718,6 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
> .pid = pid,
> .tty = tty,
> .stack = stack });
> -
> if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
> IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
> "winch", winch) < 0) {
> diff --git a/arch/um/drivers/line.h b/arch/um/drivers/line.h
> index 63df3ca..54adfc6 100644
> --- a/arch/um/drivers/line.h
> +++ b/arch/um/drivers/line.h
> @@ -31,9 +31,8 @@ struct line_driver {
> };
>
> struct line {
> - struct tty_struct *tty;
> - spinlock_t count_lock;
> - unsigned long count;
> + struct tty_port port;
> +
> int valid;
>
> char *init_str;
> @@ -59,15 +58,17 @@ struct line {
> };
>
> #define LINE_INIT(str, d) \
> - { .count_lock = __SPIN_LOCK_UNLOCKED((str).count_lock), \
> - .init_str = str, \
> + { .init_str = str, \
> .init_pri = INIT_STATIC, \
> .valid = 1, \
> .lock = __SPIN_LOCK_UNLOCKED((str).lock), \
> .driver = d }
>
> extern void line_close(struct tty_struct *tty, struct file * filp);
> -extern int line_open(struct line *lines, struct tty_struct *tty);
> +extern int line_open(struct tty_struct *tty, struct file *filp);
> +extern int line_install(struct tty_driver *driver, struct tty_struct *tty, struct line *line);
> +extern void line_cleanup(struct tty_struct *tty);
> +extern void line_hangup(struct tty_struct *tty);
> extern int line_setup(struct line *lines, unsigned int sizeof_lines,
> char *init, char **error_out);
> extern int line_write(struct tty_struct *tty, const unsigned char *buf,
> diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
> index 9d8c20a..89e4e75 100644
> --- a/arch/um/drivers/ssl.c
> +++ b/arch/um/drivers/ssl.c
> @@ -92,6 +92,7 @@ static int ssl_remove(int n, char **error_out)
> error_out);
> }
>
> +#if 0
> static int ssl_open(struct tty_struct *tty, struct file *filp)
> {
> int err = line_open(serial_lines, tty);
> @@ -103,7 +104,6 @@ static int ssl_open(struct tty_struct *tty, struct file *filp)
> return err;
> }
>
> -#if 0
> static void ssl_flush_buffer(struct tty_struct *tty)
> {
> return;
> @@ -124,8 +124,16 @@ void ssl_hangup(struct tty_struct *tty)
> }
> #endif
>
> +static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
> +{
> + if (tty->index < NR_PORTS)
> + return line_install(driver, tty, &serial_lines[tty->index]);
> + else
> + return -ENODEV;
> +}
> +
> static const struct tty_operations ssl_ops = {
> - .open = ssl_open,
> + .open = line_open,
> .close = line_close,
> .write = line_write,
> .put_char = line_put_char,
> @@ -134,9 +142,11 @@ static const struct tty_operations ssl_ops = {
> .flush_buffer = line_flush_buffer,
> .flush_chars = line_flush_chars,
> .set_termios = line_set_termios,
> - .ioctl = line_ioctl,
> .throttle = line_throttle,
> .unthrottle = line_unthrottle,
> + .install = ssl_install,
> + .cleanup = line_cleanup,
> + .hangup = line_hangup,
> #if 0
> .stop = ssl_stop,
> .start = ssl_start,
> diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
> index 088776f..014f3ee 100644
> --- a/arch/um/drivers/stdio_console.c
> +++ b/arch/um/drivers/stdio_console.c
> @@ -97,7 +97,7 @@ static int con_remove(int n, char **error_out)
>
> static int con_open(struct tty_struct *tty, struct file *filp)
> {
> - int err = line_open(vts, tty);
> + int err = line_open(tty, filp);
> if (err)
> printk(KERN_ERR "Failed to open console %d, err = %d\n",
> tty->index, err);
> @@ -105,6 +105,14 @@ static int con_open(struct tty_struct *tty, struct file *filp)
> return err;
> }
>
> +static int con_install(struct tty_driver *driver, struct tty_struct *tty)
> +{
> + if (tty->index < MAX_TTYS)
> + return line_install(driver, tty, &vts[tty->index]);
> + else
> + return -ENODEV;
> +}
> +
> /* Set in an initcall, checked in an exitcall */
> static int con_init_done = 0;
>
> @@ -118,9 +126,11 @@ static const struct tty_operations console_ops = {
> .flush_buffer = line_flush_buffer,
> .flush_chars = line_flush_chars,
> .set_termios = line_set_termios,
> - .ioctl = line_ioctl,
> .throttle = line_throttle,
> .unthrottle = line_unthrottle,
> + .cleanup = line_cleanup,
> + .install = con_install,
> + .hangup = line_hangup,
> };
>
> static void uml_console_write(struct console *console, const char *string,
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