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From: Steven Newbury <steve@snewbury.org.uk>
Reply-To: Steven Newbury <steve@snewbury.org.uk>
To: Yinghai Lu <yinghai@kernel.org>
Cc: "Barnes, Jesse" <jesse.barnes@intel.com>,
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Subject: Re: PCI resources above 4GB
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Date: Fri, 13 Apr 2012 09:34:36 +0100
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On Fri, 13 Apr 2012, 09:26:55 BST, Yinghai Lu <yinghai@kernel.org> wrote:

> On Thu, Apr 12, 2012 at 9:40 AM, Steven Newbury <steve@snewbury.org.uk>
> wrote:
> > > > 
> > > > It would be useful to preserve as much low PCI memory address
> > > > space as possible for hotplug devices (like my Radeon), but the
> > > > other problem is small regions get allocated at the bottom,
> > > > resulting in the inability to find large aligned regions later on.
> > > >  I see code to default to top-down allocation was reverted, I
> > > > guess I'm going to have to dig into the archive to find out why...
> 
> Please check attached patches that will find_resource with fit. It may
> leave space for your hotplug devices.
> 
>     PCI: Should add children device res to fail list
>     PCI: Try to allocate mem64 above 4G at first
>     intel-gtt: Read 64bit for gmar_bus_addr
>     PCI: Make sure assign same align with large size resource at first
>     resource: make find_resource could return just fit resource
>     PCI: Don't allocate small resource in big empty space.
>     resource: only return range with needed align
> 
> You can get them from
> 
>             
> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
> for-pci-res-alloc
> 
Thanks Yinghai, I'll give it a spin.