linux-kernel - [RFC 0/2] PCI: Introduce pci_ops::use_arch

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Date:   Sat, 20 Mar 2021 00:19:54 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>, Clint Sbisa <csbisa@...zon.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>
Subject: [RFC 0/2] PCI: Introduce pci_ops::use_arch_sysdata

Hi Bjorn,

I'm currently working on virtual PCI support for Hyper-V ARM64 guests.
Similar to virtual PCI on x86 Hyper-V guests, the PCI root bus is not
probed via ACPI (or of), it's probed from Hyper-V VMbus, therefore it
doesn't have config window.

Since ARM64 is a CONFIG_PCI_DOMAINS_GENERIC=y, PCI core code always
treats as the root bus has a config window. So we need to resolve this
and want to reuse the code as much as possible. My current solution is
introducing a pci_ops::use_arch_sysdata, and if it's true, the PCI core
code treats the pci_bus::sysdata as an arch-specific sysdata (rather
than pci_config_window) for CONFIG_PCI_DOMAINS_GENERIC=y architectures.
This allows us to reuse the existing code for Hyper-V PCI controller.

This is simply a proposal, I'm open to any suggestion.

Thanks!

Regards,
Boqun

Boqun Feng (2):
  arm64: PCI: Allow use arch-specific pci sysdata
  PCI: hv: Tell PCI core arch-specific sysdata is used

 arch/arm64/include/asm/pci.h        | 29 +++++++++++++++++++++++++++++
 arch/arm64/kernel/pci.c             | 15 ++++++++++++---
 drivers/pci/controller/pci-hyperv.c |  3 +++
 include/linux/pci.h                 |  3 +++
 4 files changed, 47 insertions(+), 3 deletions(-)

-- 
2.30.2