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Date:   Wed, 14 Jul 2021 14:49:35 -0500
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Boqun Feng <boqun.feng@gmail.com>
Cc:     Bjorn Helgaas <bhelgaas@google.com>, Arnd Bergmann <arnd@arndb.de>,
        Marc Zyngier <maz@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
        Sunil Muthuswamy <sunilmut@microsoft.com>,
        Mike Rapoport <rppt@kernel.org>
Subject: Re: [RFC v4 4/7] PCI: hv: Generify PCI probing
Message-ID: <20210714194935.GA1870211@bjorn-Precision-5520>
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On Wed, Jul 14, 2021 at 06:27:34PM +0800, Boqun Feng wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> In order to support ARM64 Hyper-V PCI, we need to set up the bridge at
> probing time because ARM64 is a PCI_DOMAIN_GENERIC arch and we don't
> have pci_config_window (ARM64 sysdata) for a PCI root bus on Hyper-V, so
> it's impossible to retrieve the information (e.g. PCI domains, irq
> domains) from bus sysdata on ARM64 after creation.
> 
> Originally in create_root_hv_pci_bus(), pci_create_root_bus() is used to
> create the root bus and the corresponding bridge based on x86 sysdata.
> Now we create a bridge first and then call pci_scan_root_bus_bridge(),
> which allows us to do the necessary set-ups for the bridge.

Also here and other patches in this series:

  s/irq/IRQ/
  s/msi/MSI/

in subject lines, commit logs, comments.