linux-kernel - Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

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Message-ID: <54E2FEF2.8060701@plexistor.com>
Date:	Tue, 17 Feb 2015 10:42:26 +0200
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Matthew Wilcox <willy@...ux.intel.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>, x86@...nel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-nvdimm <linux-nvdimm@...ts.01.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

On 02/17/2015 12:03 AM, Matthew Wilcox wrote:
> On Mon, Feb 16, 2015 at 01:07:07PM +0200, Boaz Harrosh wrote:
>> In any way this is a problem for the new type-12 NvDIMM memory chips that
>> are circulating around. (It is estimated that there are already 100ds of
>> thousands NvDIMM chips in active use)
> 
> Hang on.  NV-DIMM chips don't know anyhing about E820 tables.  They don't
> have anything in them that says "I am type 12!".  How they are reported
> is up to the BIOS.  Just because your BIOS vendor has chosen to report
> tham as type 12 doesn't mean that any other BIOS vedor is going to have
> done the same thing.
> 
> Fortunately, the BIOS people have all got together and decided what
> they're going to do, and it's not type 12.  Unfortunately, I think
> I'm bound by various agreements to not say what they are going to do
> until they do.  But putting this temporary workaround in the kernel to
> accomodate one BIOS vendor's unreleased experimental code seems like
> entirely the wrong idea.
> 

I had a feeling I'm entering an holy war ;-).

I hope you are OK with my first patch. That an unknown type need not
be reported busy, and behave same as "reserved"?

Then if we agree about PATCH-1, which is the actual fix.
Then the 2nd patch (hence the RFC btw) is nothing more than
a name.

I have an old BIOS that knows nothing of NvDIMM, actually a few
of them they all report 12.
The fact of the matter is that all the people I've talked with,
reported that different vendor chips, all came up type-12.
Perhaps type-12 just means "Unknown to current BIOS"

What is the name you suggest "type-12" "unknown-12".
Do you understand why they all come out 12 ?

Thanks
Boaz

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