linux-kernel - Re: SNB PCI root information

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Message-ID: <CAE9FiQWKxe9VYvrQy5h4RP2dS7YHHXu4icjC+KPipkRKbsZN1g@mail.gmail.com>
Date:	Wed, 20 Jun 2012 20:50:03 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ulrich Drepper <drepper@...il.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

On Wed, Jun 20, 2012 at 7:37 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Wed, Jun 20, 2012 at 12:34 PM, Ingo Molnar <mingo@...nel.org> wrote:
>>> if the vendor provide _PXM, that _PXM should be right and be
>>> trusted.
>>>
>>> if the vendor does not provide _PXM, we can have command line
>>> to input it before user can get one updated BIOS from vendor.
>>
>> So how about an incorrect _PXM, or a slightly inefficient one?
>> Why shouldn't it be possible for the user to override it?
>
> Try to keep the code simple.
>
>>
>> I mean, if we create a parameter space that tweaks data then why
>> not make it complete and allow *all* firmware data to be
>> (optionally) modified, from the kernel boot line?
>
> that pxm/node for pci device should be consistent with srat table etc,
> so better solution is that BIOS keep them consistent.
>
> If BIOS provide _PXM for pci device, the _PXM should have more chance
> to be right.
>
> Anyway if you insist that it should cover that wrong case, let me
> check if it could be done simply.

please check -v3, and it will add 40 lines.

and -v2 is about 25 lines.

Thanks

Yinghai

Download attachment "busnum_node_v3.patch" of type "application/octet-stream" (3956 bytes)