linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <20071216212628.GF14265@elf.ucw.cz>
Date:	Sun, 16 Dec 2007 22:26:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, unlisted-recipients:
	no@...is.elte.hu, To-header@...is.elte.hu, on@...is.elte.hu,
	"input <"@elvis.elte.hu, ; Rene Herman <rene.herman@...access.nl>,
	Paul Rolland <rol@...917.net>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
	with MCP51 laptops

On Fri 2007-12-14 15:33:28, Ingo Molnar wrote:
> 
> * Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> > There is another reason we can't just do a dumb changeover - two 
> > actually
> > 
> > #1: Some drivers are using inb_p/outb_p in PCI cases which are going 
> > #to cause PCI posting changes. Most are probably just wrong in the 
> > #first place but they need hand checking
> 
> hm, any intelligent way to force PCI posting? I guess not.
> 
> here's a list of candidate drivers (match the out*_p() pattern and do 
> pci)
> 
> ./char/epca.c 
> ./char/sonypi.c
> ./scsi/megaraid.c
> ./ide/pci/serverworks.c
> ./ide/pci/cmd640.c
> ./input/mouse/pc110pad.c

/*
 * We try to avoid enabling the hardware if it's not
 * there, but we don't know how to test. But we do know
 * that the PC110 is not a PCI system. So if we find any
 * PCI devices in the machine, we don't have a PC110.
 */

...so pc110 _may_ be okay.
								Pavel

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