linux-kernel - Re: [PATCH] pci: enable MSI on 8132

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Message-ID: <86802c440902210031j698403cev2147e72a61e17194@mail.gmail.com>
Date:	Sat, 21 Feb 2009 00:31:43 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>, david@...g.hm,
	Matthew Wilcox <matthew@....cx>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, DL-MPTFusionLinux@....com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: enable MSI on 8132

On Fri, Feb 20, 2009 at 11:50 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Robert Hancock <hancockrwd@...il.com> writes:
>>
>> Is there a reason why we can't just enable the HT MSI mapping for any bridge
>> device that has that PCI capability and is underneath an HT bridge?
>
> The code should be under CONFIG_X86 because the rules for enabling HT MSI mappings
> are different for other architectures.  But otherwise I can't think of a reason.

move to arch/x86/pci/fixup.c?

it seems some other arch do support HT ... powerpc, mips?

>
>> Essentially
>> the code for nv_msi_ht_cap_quirk could potentially be applied to all bridges as
>> it is currently for NVIDIA and ALi bridges..
>
> Sounds like it would save a fair amount of grief.

it seems there is some difference.
8132 is some kind of HT tunnel, and the bridge is acctually pci-x bridge.

mcp55 and ck804: is HT end device with several pcie bridges.

also 8131 has problem with HT MSI?

YH
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