linux-kernel - Re: [PATCH] pci: don't enable too much HT MSI mapping -v5 -resend

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Date:	Sat, 28 Mar 2009 13:34:44 +0100
From:	Prakash Punnoor <prakash@...noor.de>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Yinghai Lu <yinghai@...nel.org>, Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Robert Hancock <hancockrwd@...il.com>, david@...g.hm,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: don't enable too much HT MSI mapping -v5 -resend

On Freitag 27 März 2009 00:10:01 Jesse Barnes wrote:
> On Fri, 20 Mar 2009 19:29:41 -0700
>
> Yinghai Lu <yinghai@...nel.org> wrote:
> > Impact: fix bug
> >
> > Prakash reported that his c51-mcp51 system ondie sound card doesn't
> > work MSI but if he hack out the HT-MSI on mcp51, the MSI will work
> > well with sound card.
> >
> > this patch rework the nv_msi_ht_cap_quirk()
> > and will only try to avoid to enable ht_msi on device following that
> > root dev, and don't touch that root dev
> >
> > v3: will enable c51...
> > v4: will enable c51 kind of without leaf too.
> > v5: update to mainline
> >
> > Reported-by: Prakash Punnoor <prakash@...noor.de>
> > Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> Applied, thanks.  Prakash if you get a chance can you try testing my
> linux-next branch (or just linux-next in general tomorrow) to make sure
> this is still ok for you?
>
> Thanks,

Finally I am able to test the linux-next branch of pci tree after Jesse gave 
some help with git.(Is it correct that the kernel calls itself 2.6.28-rc8? I 
looked into quirks.c and it seems to be correctly patched.) Unfortunately it 
doesn't seem to work for me (and I am wondering why as the old v4 version 
seemed to work ontop of one of the 2.6.29-rc versions):

dmesg|grep HT
pci 0000:00:00.0: Found disabled HT MSI Mapping
pci 0000:00:03.0: Enabling HT MSI Mapping
pci 0000:00:09.0: Found disabled HT MSI Mapping
pci 0000:00:0e.0: Enabling HT MSI Mapping
pci 0000:00:09.0: Found disabled HT MSI Mapping
pci 0000:00:0f.0: Enabling HT MSI Mapping
pci 0000:00:09.0: Found disabled HT MSI Mapping
pci 0000:00:10.0: Enabling HT MSI Mapping
pci 0000:00:09.0: Found disabled HT MSI Mapping
pci 0000:00:10.1: Enabling HT MSI Mapping

Device 09.0 doesn't get enabled (good) but 00.0 also not (bad). Then my Intel 
HDA cannot use MSI.

Regards,

Prakash


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