Thanks Jeff,
I'll try the patch in the next day or so and let you know.
Mark
At 01:02 PM 8/24/2007, Jeff Dike wrote:
>On Thu, Aug 23, 2007 at 09:36:42AM -0700, Mark wrote:
> > Sorry about the HTML email, I think it is disabled now.
>
>Yup, thanks.
>
> > The ioctl calls that returned -1 from the strace are:
> > ioctl (4, TIOCGSERIAL)
> > ioctl (3, TIOCMGET,[0])
> > ioctl (4, SNDCTL_TMR_START or TCSETS, {B230400 -opost -isig -icanon
> > -echo ...})
>
>See if the patch below makes any difference. I pass TIOCGSERIAL
>through to the host since the serial drivers seem to handle it.
>TIOCMGET and TCSETS seem to be handled within the kernel without
>looking at hardware.
>
> > The problem seems (to me) to be that the buffer in the host is not
> > getting flushed to the client (or guest to host) correctly or something
> > similar. I also suspect this is the same reason ssh and sftp are slow
> > to get the login prompt. Not a big problem though.
>
>You might debug this by running strace simultaneously, with
>timestamps, on UML on the host and on wvdial inside UML and merging
>the output.
>
> Jeff
>
>--
>Work email - jdike at linux dot intel dot com
>
>Index: linux-2.6.22/arch/um/drivers/chan_kern.c
>===================================================================
>--- linux-2.6.22.orig/arch/um/drivers/chan_kern.c 2007-08-24
>12:45:06.000000000 -0400
>+++ linux-2.6.22/arch/um/drivers/chan_kern.c 2007-08-24
>12:45:29.000000000 -0400
>@@ -309,6 +309,21 @@ int write_chan(struct list_head *chans,
> return ret;
> }
>
>+int ioctl_chan(struct list_head *chans, unsigned int cmd, unsigned long arg)
>+{
>+ struct list_head *ele;
>+ struct chan *chan;
>+
>+ list_for_each(ele, chans) {
>+ chan = list_entry(ele, struct chan, list);
>+ if (chan->primary)
>+ return os_ioctl_generic(chan->fd, cmd, arg);
>+ }
>+
>+ /* Shouldn't get here */
>+ return -ENODEV;
>+}
>+
> int console_write_chan(struct list_head *chans, const char *buf, int len)
> {
> struct list_head *ele;
>Index: linux-2.6.22/arch/um/drivers/line.c
>===================================================================
>--- linux-2.6.22.orig/arch/um/drivers/line.c 2007-08-24
>12:45:06.000000000 -0400
>+++ linux-2.6.22/arch/um/drivers/line.c 2007-08-24 12:58:50.000000000 -0400
>@@ -5,6 +5,8 @@
>
> #include "linux/irqreturn.h"
> #include "linux/kd.h"
>+#include <linux/serial.h>
>+#include <asm/uaccess.h>
> #include "chan_kern.h"
> #include "irq_kern.h"
> #include "irq_user.h"
>@@ -242,37 +244,11 @@ void line_set_termios(struct tty_struct
> /* 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, struct file * file,
> unsigned int cmd, unsigned long arg)
> {
>+ struct line *line = tty->driver_data;
> int ret;
>- int i;
>
> ret = 0;
> switch(cmd) {
>@@ -294,6 +270,9 @@ int line_ioctl(struct tty_struct *tty, s
> case TCSETSW:
> case TCSETS:
> case TCGETA:
>+ case TIOCMGET:
>+ case TIOCMSET:
>+ case TCSBRKP:
> case TCSETAF:
> case TCSETAW:
> case TCSETA:
>@@ -306,20 +285,29 @@ int line_ioctl(struct tty_struct *tty, s
> case TIOCPKT:
> case TIOCGSOFTCAR:
> case TIOCSSOFTCAR:
>+ case TIOCLINUX:
>+ case KDGKBMODE:
>+ case KDGKBTYPE:
>+ case KDSIGACCEPT:
> return -ENOIOCTLCMD;
>+ case TIOCGSERIAL: {
>+ struct serial_struct tmp;
>+
>+ ret = ioctl_chan(&line->chan_list, TIOCGSERIAL, (int) &tmp);
>+ if (ret)
>+ break;
>+
>+ if (copy_to_user((void __user *) arg, &tmp, sizeof(tmp)))
>+ ret = -EFAULT;
>+ }
> #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",
>- __FUNCTION__, tty->name, cmd);
>- }
>+ printk(KERN_ERR "line_ioctl : %s: unknown ioctl: 0x%x\n",
>+ tty->name, cmd);
> ret = -ENOIOCTLCMD;
> break;
> }
>Index: linux-2.6.22/arch/um/include/chan_kern.h
>===================================================================
>--- linux-2.6.22.orig/arch/um/include/chan_kern.h 2007-08-24
>12:45:06.000000000 -0400
>+++ linux-2.6.22/arch/um/include/chan_kern.h 2007-08-24
>12:45:29.000000000 -0400
>@@ -34,6 +34,8 @@ extern int parse_chan_pair(char *str, st
> extern int open_chan(struct list_head *chans);
> extern int write_chan(struct list_head *chans, const char *buf, int len,
> int write_irq);
>+extern int ioctl_chan(struct list_head *chans, unsigned int cmd,
>+ unsigned long arg);
> extern int console_write_chan(struct list_head *chans, const char *buf,
> int len);
> extern int console_open_chan(struct line *line, struct console *co);
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