Messages in this thread | | | From | Boqun Feng <> | Subject | [RFC v5 0/8] PCI: hv: Support host bridge probing on ARM64 | Date | Tue, 20 Jul 2021 21:44:21 +0800 |
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Hi Bjorn, Arnd and Marc,
This is the v5 for the preparation of virtual PCI support on Hyper-V ARM64, Previous versions:
v1: https://lore.kernel.org/lkml/20210319161956.2838291-1-boqun.feng@gmail.com/ v2: https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@gmail.com/ v3: https://lore.kernel.org/lkml/20210609163211.3467449-1-boqun.feng@gmail.com/ v4: https://lore.kernel.org/lkml/20210714102737.198432-1-boqun.feng@gmail.com/
Changes since last version:
* Rebase to 5.14-rc2
* Wording changes (Capitalization and more explanation on why) as suggested by Bjorn.
* Split the patch #3 in previous into two patches as suggested by Bjorn.
The basic problem we need to resolve is that ARM64 is an arch with PCI_DOMAINS_GENERIC=y, so the bus sysdata is pci_config_window. However, Hyper-V PCI provides a paravirtualized PCI interface, so there is no actual pci_config_window for a PCI host bridge, so no information can be retrieve from the pci_config_window of a Hyper-V virtual PCI bus. Also there is no corresponding ACPI device for the Hyper-V PCI root bridge, which introduces a special case when trying to find the ACPI device from the sysdata (see patch #3).
With this patchset, we could enable the virtual PCI on Hyper-V ARM64 guest with other code under development.
Comments and suggestions are welcome.
Regards, Boqun
Arnd Bergmann (1): PCI: hv: Generify PCI probing
Boqun Feng (7): PCI: Introduce domain_nr in pci_host_bridge PCI: Support populating MSI domains of root buses via bridges arm64: PCI: Restructure pcibios_root_bridge_prepare() arm64: PCI: Support root bridge preparation for Hyper-V PCI: hv: Set ->domain_nr of pci_host_bridge at probing time PCI: hv: Set up MSI domain at bridge probing time PCI: hv: Turn on the host bridge probing on ARM64
arch/arm64/kernel/pci.c | 29 +++++++--- drivers/pci/controller/pci-hyperv.c | 86 +++++++++++++++++------------ drivers/pci/probe.c | 12 +++- include/linux/pci.h | 10 ++++ 4 files changed, 92 insertions(+), 45 deletions(-)
-- 2.30.2
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