linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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Date:	Tue, 1 Jan 2008 17:31:26 +0000
From:	Pavel Machek <pavel@....cz>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Rene Herman <rene.herman@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Rolland <rol@...917.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Hi!

> 1. It appears to be a real port.  SMI traps are not happening in the
> normal outb to 80.  Hundreds of them execute perfectly with the expected
> instruction counts.  If I can trace the particular event that creates
> the hard freeze (getting really creative, here) and stop before the
> freeze disables the entire computer, I will.  That may be an SMI, or
> perhaps any other kind of interrupt or exception.  Maybe someone knows
> how to safely trace through an impending SMI while doing printk's or
> something?
> 
> 2. It appears to be the standard POST diagnostic port.  On a whim, I
> disassembled my DSDT code, and studied it more closely.   It turns out
> that there are a bunch of "Store(..., DBUG)" instructions scattered
> throughout, and when you look at what DBUG is defined as, it is defined
> as an IO Port at IO address DBGP, which is a 1-byte value = 0x80.  So
> the ACPI BIOS thinks it has something to do with debugging.   There's a
> little strangeness here, however, because the value sent to the port
> occasionally has something to do with arguments to the ACPI operations
> relating to sleep and wakeup ...  could just be that those arguments are
> distinctive.

Maybe someone just left debugging code in production?

> In thinking about this, I recognize a couple of things.  ACPI is telling
> us something when it declares a reference to port 80 in its code.  It's
> not telling us the function of this port on this machine, but it is
> telling us that it is being used by the BIOS.   This could be a reason
> to put out a printk warning message...   'warning: port 80 is used by
> ACPI BIOS - if you are experiencing problems, you might try an alternate
> means of iodelay.'
> 
> Second, it seems likely that there are one of two possible reasons that
> the port 80 writes cause hang/freezes:
> 
> 1. buffer overflow in such a device.
> 
> 2. there is some "meaning" to certain byte values being written (the
> _PTS and _WAK use of arguments that come from callers to store into port
> 80 makes me suspicious.)   That might mean that the freeze happens only
> when certain values are written, or when they are written closely in
> time to some other action - being used to communicate something to the

There's nothing easier than always writing 0 to the 0x80 to check if
it hangs in such case...?
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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