linux-kernel - Re: tg3 broken after "PCI: Fix bus resource assignment on 32 bits with 64b resources"

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Date:	Wed, 6 Feb 2008 02:40:46 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Alexey Dobriyan" <adobriyan@...ru>
Cc:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: Re: tg3 broken after "PCI: Fix bus resource assignment on 32 bits with 64b resources"

On Feb 6, 2008 2:05 AM, Alexey Dobriyan <adobriyan@...ru> wrote:
>
> On Wed, Feb 06, 2008 at 07:49:52AM +1100, Benjamin Herrenschmidt wrote:
> >
> > > so x86_64 will work well?
> > >
> > > the problem is that BIOS does not assign one resource for you tg3. and
> > > kernel pcibios_assign_to_unassign (?) try
> > > to assign resource to your card.
> >
> > But the kernel shouldn't try to assign a resource in the 64 bits space
> > to a card behind a bridge... at least not a non-prefetchable resource
> > since those can't be forwarded (P2P bridges only define a 32 bits window
> > for non-prefetchable resources).
> >
> > So it does look to me like the kernel may be doing something wrong. I
> > haven't had a chance to look at the logs in details yet (just woke up).
> >
> > > revert the patch happen to work, you only have 2g less RAM (?), so
> > > 0x8000000 still can be used.
> > >
> > > sometime you could get hang if your MB have two HT chains. ...because
> > > BIOS already allocate two io range for the two chain.
> > > and kernel may assign resource from the range1 belong to HT1 to device
> > > under HT0.
> > > solution: need pci root bios to provide _CRS to replace...
> > > and i have one patch but it only take care of 64 bit kernel for this case.
> > >
> > >
> > > easy solution for you: try to get one updated BIOS.
>
> BTW, "[PATCH] x86_32: fix regression caused by trim ram according to mtrr on system with 4G more RAM"
> http://marc.info/?l=linux-kernel&m=120229095121673&w=2
> fixes this box too and I have back all 4G of RAM as a bonus. :-)

so you have 4g ram, and with hw memhole enabled? BIOS should have Tom2
set, and WB set ..

you must have rev C or Rev E instead of rev F?

can you post the /proc/mtrrs and boot message?

YH
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