PCI resources above 4GB
steve at snewbury.org.uk
Fri Apr 13 01:34:36 PDT 2012
On Fri, 13 Apr 2012, 09:26:55 BST, Yinghai Lu <yinghai at kernel.org> wrote:
> On Thu, Apr 12, 2012 at 9:40 AM, Steven Newbury <steve at snewbury.org.uk>
> > > >
> > > > 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
Thanks Yinghai, I'll give it a spin.
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