linux-kernel - Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic

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Message-ID: <4D3F4A69.7090702@teksavvy.com>
Date:	Tue, 25 Jan 2011 17:10:49 -0500
From:	Mark Lord <kernel@...savvy.com>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
CC:	James Bottomley <James.Bottomley@...e.de>,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86-ML <x86@...nel.org>,
	Tony Luck <tony.luck@...el.com>, Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Willy Tarreau <wtarreau@...a.kernel.org>,
	Willy Tarreau <w@....eu>, Dirk Hohndel <hohndel@...radead.org>,
	Dirk.Hohndel@...el.com, IDE-ML <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk	upon
 panic

On 11-01-25 12:05 PM, Ahmed S. Darwish wrote:
>
> My current x86 laptop includes the very common ATA PIIX controller. 


ata_piix is just about ideal for this sort of thing.

Except, don't use the BIOS to write the logs,
but rather code/use a very simple set of polling-PIO
functions to talk directly through the PIIX to the drive.

Really really simple code to do that, and it would likely
work with anything ata-piix, and most other non-AHCI chipsets too.

Not perfect, but probably good enough for a lot of scenarios.
The old hd.c driver shows how to read/write a sector at a time,
and that kind of code is easily converted to simply poll for completion.

Cheers
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