linux-kernel - Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

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Message-ID: <20070302142256.GK2156@elf.ucw.cz>
Date:	Fri, 2 Mar 2007 15:22:56 +0100
From:	Pavel Machek <pavel@....cz>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Rudolf Marek <r.marek@...embler.cz>,
	linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

Hi!

> > The DSDT code clearly can't touch the hardware itself - hardware access 
> > is carried out by the kernel. If we can identify cases where ACPI reads 
> > and writes would touch resources claimed by other drivers, that would be 
> > a good starting point for working out what's going on.
> 
> I'm not familiar with APCI at all so I didn't know, but what you write
> here brings some hope. Would it be possible to parse all the DSDT code
> at boot time and deduce all the ports which ACPI would need to request
> to be safe?

I'm afraid it is about as hard as disassembling SMM BIOS to figure out
what it accesses.

> > Of course, this ignores the case where the DSDT just traps into SMM 
> > code. That one is clearly unsolvable.
> 
> Yeah, SMM is an even more complex problem :(
> 
> Do we know in advance when we are going to SMM mode and back? If we

SMM is often invoked by timer, AC unplug, etc.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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