From: Greg Kurz <gkurz@linux.vnet.ibm.com>
To: Thomas Huth <thuth@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH] spapr/pci: populate PCI DT in reverse order
Date: Thu, 3 Dec 2015 15:53:17 +0100 [thread overview]
Message-ID: <20151203155317.46a4f446@bahia.local> (raw)
In-Reply-To: <565E15B6.60501@redhat.com>
On Tue, 1 Dec 2015 22:48:38 +0100
Thomas Huth <thuth@redhat.com> wrote:
> On 30/11/15 11:45, Greg Kurz wrote:
> > Since commit 1d2d974244c6 "spapr_pci: enumerate and add PCI device tree", QEMU
> > populates the PCI device tree in the opposite order compared to SLOF.
> >
> > Before 1d2d974244c6:
> >
> > Populating /pci@800000020000000
> > 00 0000 (D) : 1af4 1000 virtio [ net ]
> > 00 0800 (D) : 1af4 1001 virtio [ block ]
> > 00 1000 (D) : 1af4 1009 virtio [ network ]
> > Populating /pci@800000020000000/unknown-legacy-device@2
> >
> >
> > 7e5294b8 : /pci@800000020000000
> > 7e52b998 : |-- ethernet@0
> > 7e52c0c8 : |-- scsi@1
> > 7e52c7e8 : +-- unknown-legacy-device@2 ok
> >
> > Since 1d2d974244c6:
> >
> > Populating /pci@800000020000000
> > 00 1000 (D) : 1af4 1009 virtio [ network ]
> > Populating /pci@800000020000000/unknown-legacy-device@2
> > 00 0800 (D) : 1af4 1001 virtio [ block ]
> > 00 0000 (D) : 1af4 1000 virtio [ net ]
> >
> >
> > 7e5e8118 : /pci@800000020000000
> > 7e5ea6a0 : |-- unknown-legacy-device@2
> > 7e5eadb8 : |-- scsi@1
> > 7e5eb4d8 : +-- ethernet@0 ok
> >
> > This behaviour change is not actually a bug since no assumptions should be
> > made on DT ordering. But it has no real justification either, other than
> > being the consequence of the way fdt_add_subnode() inserts new elements
> > to the front of the FDT rather than adding them to the tail.
> >
> > This patch reverts to the historical SLOF ordering by walking PCI devices in
> > reverse order.
>
> I've applied your patch here locally, and indeed, the device tree looks
> nicer to me, too, when the nodes are listed in ascending order.
>
> Tested-by: Thomas Huth <thuth@redhat.com>
>
>
Thanks for testing !
Cheers.
--
Greg
next prev parent reply other threads:[~2015-12-03 14:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-30 10:45 [Qemu-devel] [PATCH] spapr/pci: populate PCI DT in reverse order Greg Kurz
2015-12-01 21:48 ` Thomas Huth
2015-12-03 14:53 ` Greg Kurz [this message]
2015-12-17 8:43 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2015-12-21 1:56 ` David Gibson
2015-12-21 8:09 ` Greg Kurz
2015-12-23 5:47 ` Nikunj A Dadhania
2017-02-22 10:56 [Qemu-devel] " Greg Kurz
2017-02-27 22:20 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2017-03-01 1:07 ` David Gibson
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