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

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Message-ID: <4D3F529D.8060406@pobox.com>
Date:	Tue, 25 Jan 2011 17:45:49 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Randy Dunlap <rdunlap@...otime.net>
CC:	Mark Lord <kernel@...savvy.com>,
	"Ahmed S. Darwish" <darwish.07@...il.com>,
	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>,
	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>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon
 panic

On 01/25/2011 05:16 PM, Randy Dunlap wrote:
> On Tue, 25 Jan 2011 17:10:49 -0500 Mark Lord wrote:
>
>> 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.
>
> I don't know how/where to find it, but Rusty Russell had a version of this
> many, many years ago.

You beat me to the reply :)

http://lwn.net/Articles/9905/

but IIRC there were updates and improvements.

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