The PCI Firmware Spec requires BIOS to use _CBA, not MCFG, to report
MMCONFIG regions of hot-pluggable host bridges. Therefore, if the
hardware and firmware support host bridge hotplug, we will encounter
_CBA even if Linux itself doesn't support hotplug.
These patches make the pci_root driver keep track of the downstream
bus range and make it available so arch-specific code can register
MMCONFIG regions if necessary.
The first patch merely *prints* the downstream range, without saving it.
I posted that patch alone previously, before I realized that we actually
need to save the range for _CBA.
---
Bjorn Helgaas (3):
ACPI: pci_root: show entire downstream bus range
ACPI: pci_root: save downstream bus range
ACPI: pci_root: pass acpi_pci_root to arch-specific scan
arch/ia64/pci/pci.c | 5 ++++-
arch/x86/pci/acpi.c | 5 ++++-
drivers/acpi/pci_root.c | 46 ++++++++++++++++++++++++++-----------------
include/acpi/acpi_bus.h | 1 +
include/acpi/acpi_drivers.h | 3 +--
5 files changed, 38 insertions(+), 22 deletions(-)
--
Bjorn
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