[PATCH v7-incomplete 0/3] PCI: Add support for preserving boot configuration

Bjorn Helgaas
2024-04-21T19:09:27Z

From: Bjorn Helgaas <bhelgaas@google.com>

This is Vidya's work; I started splitting it into separate patches.

This is based on v6
(https://lore.kernel.org/r/20240418174043.3750240-1-vidyas@nvidia.com) but
is missing a few pieces, so it's not complete yet. I just wanted to show
the idea of what I had in mind.

The missing pieces are:

- Set PCI_REASSIGN_ALL_BUS if !PCI_PROBE_ONLY

- Use bridge->preserve_config instead of PCI_PROBE_ONLY

- Change to use pci_assign_unassigned_root_bus_resources() instead of
pci_bus_size_bridge() and pci_bus_assign_resources()

Bjorn Helgaas (3):
PCI: Move PRESERVE_BOOT_CONFIG _DSM evaluation to
pci_register_host_bridge()
PCI: of: Add of_pci_preserve_config() for per-host bridge support
PCI: Unify ACPI and DT 'preserve config' support

drivers/acpi/pci_root.c | 12 ---------
drivers/pci/of.c | 60 ++++++++++++++++++++++++++++++++---------
drivers/pci/pci-acpi.c | 22 +++++++++++++++
drivers/pci/pci.h | 12 +++++++++
drivers/pci/probe.c | 14 ++++++++++
5 files changed, 95 insertions(+), 25 deletions(-)

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2.34.1