linux-kernel - Re: [PATCH 0/6] Add support for the root PCI bus device-tree node creation.

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Message-ID: <CAL_JsqK-UhnaJ8TgV1PzCO5yO99NQq3ZZcagKvkvg0YgcxFXug@mail.gmail.com>
Date: Tue, 5 Nov 2024 13:59:40 -0600
From: Rob Herring <robh@...nel.org>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Saravana Kannan <saravanak@...gle.com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Lizhi Hou <lizhi.hou@....com>, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org, 
	Allan Nielsen <allan.nielsen@...rochip.com>, Horatiu Vultur <horatiu.vultur@...rochip.com>, 
	Steen Hegelund <steen.hegelund@...rochip.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 0/6] Add support for the root PCI bus device-tree node creation.

On Tue, Nov 5, 2024 at 11:44 AM Herve Codina <herve.codina@...tlin.com> wrote:
>
> Hi Rob,
>
> On Mon, 4 Nov 2024 14:15:07 -0600
> Rob Herring <robh@...nel.org> wrote:
>
> ...
> > > With those modifications, the LAN966x PCI device is working on x86 systems.
> >
> > That's nice, but I don't have a LAN966x device nor do I want one. We
> > already have the QEMU PCI test device working with the existing PCI
> > support. Please ensure this series works with it as well.
> >
>
> I will check.
>
> Can you confirm that you are talking about this test:
>   https://elixir.bootlin.com/linux/v6.12-rc6/source/drivers/of/unittest.c#L4188
>
> The test needs QEMU with a specific setup and I found this entry point:
>   https://lore.kernel.org/all/fa208013-7bf8-80fc-2732-814f380cebf9@amd.com/

Yes, that's it.

> Do you have an "official" QEMU setup on your side to run the test or any
> other pointers related to the QEMU command/setup you use?

No, it's just something based on what you linked. Here's what I have:

qemu-system-aarch64 -machine virt -cpu cortex-a72 -machine type=virt
-nographic -smp 1 -m 2048 -kernel ../linux.git/arch/arm64/boot/Image
--append console=ttyAMA0 -device
pcie-root-port,port=0x10,chassis=9,id=pci.9,bus=pcie.0,multifunction=on,addr=0x3
-device pcie-root-port,port=0x11,chassis=10,id=pci.10,bus=pcie.0,addr=0x3.0x1
-device x3130-upstream,id=pci.11,bus=pci.9,addr=0x0 -device
xio3130-downstream,port=0x0,chassis=11,id=pci.12,bus=pci.11,multifunction=on,addr=0x0
-device i82801b11-bridge,id=pci.13,bus=pcie.0,addr=0x4 -device
pci-bridge,chassis_nr=14,id=pci.14,bus=pci.13,addr=0x0 -device
pci-testdev,bus=pci.12,addr=0x0

Of course, you'll need a few changes to use ACPI.

Rob