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.

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