On Fri, Feb 23, 2024 at 01:30:21PM +0530, Vidya Sagar wrote: > Add support for preserving the boot configuration done by the > platform firmware per host bridge basis, based on the presence of > 'linux,pci-probe-only' property in the respective PCI host bridge > device-tree node. It also unifies the ACPI and DT based boot flows > in this regard. > > Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx> > --- > V4: > * Addressed Bjorn's review comments > > V3: > * Unified ACPI and DT flows as part of addressing Bjorn's review comments > > V2: > * Addressed issues reported by kernel test robot <lkp@xxxxxxxxx> > > drivers/acpi/pci_root.c | 12 ------- > drivers/pci/controller/pci-host-common.c | 4 --- > drivers/pci/of.c | 21 +++++++++++ > drivers/pci/probe.c | 46 ++++++++++++++++++------ > include/linux/of_pci.h | 6 ++++ > 5 files changed, 62 insertions(+), 27 deletions(-) One more thing. > @@ -3080,20 +3106,18 @@ int pci_host_probe(struct pci_host_bridge *bridge) > > bus = bridge->bus; > > + /* If we must preserve the resource configuration, claim now */ > + if (pci_has_flag(PCI_PROBE_ONLY) || bridge->preserve_config) > + pci_bus_claim_resources(bus); No reason to check PCI_PROBE_ONLY if you set preserve_config based on /chosen as well. IOW, we should deprecate PCI_PROBE_ONLY flag in favor of the per host bridge setting. Rob
