From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Newbury <steve@snewbury.org.uk>
Subject: Re: PCI resources above 4GB
Date: Fri, 13 Apr 2012 09:34:36 +0100
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To: Yinghai Lu <yinghai@kernel.org>
Cc: "Barnes, Jesse" <jesse.barnes@intel.com>, Dave Airlie <airlied@linux.ie>, Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org, DRI mailing list <dri-devel@lists.freedesktop.org>
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On Fri, 13 Apr 2012, 09:26:55 BST, Yinghai Lu <yinghai@kernel.org> wrot=
e:

> On Thu, Apr 12, 2012 at 9:40 AM, Steven Newbury <steve@snewbury.org.u=
k>
> wrote:
> > > >=20
> > > > 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.
> > > > =C2=A0I 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=
=2E..
>=20
> Please check attached patches that will find_resource with fit. It ma=
y
> leave space for your hotplug devices.
>=20
>=C2=A0 =C2=A0  PCI: Should add children device res to fail list
>=C2=A0 =C2=A0  PCI: Try to allocate mem64 above 4G at first
>=C2=A0 =C2=A0  intel-gtt: Read 64bit for gmar_bus_addr
>=C2=A0 =C2=A0  PCI: Make sure assign same align with large size resour=
ce at first
>=C2=A0 =C2=A0  resource: make find_resource could return just fit reso=
urce
>=C2=A0 =C2=A0  PCI: Don't allocate small resource in big empty space.
>=C2=A0 =C2=A0  resource: only return range with needed align
>=20
> You can get them from
>=20
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =20
> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.g=
it
> for-pci-res-alloc
>=20
Thanks Yinghai, I'll give it a spin.