tree e15274426bd88a3c0fe2287ee88f302138cef649
parent 9735a22799b9214d17d3c231fe377fc852f042e9
author Jon Derrick <jonathan.derrick@intel.com> 1460144664 -0500
committer Bjorn Helgaas <bhelgaas@google.com> 1460144664 -0500

PCI/ACPI: Allow all PCIe services on non-ACPI host bridges

Host bridges we discover via ACPI, i.e., PNP0A03 and PNP0A08 devices, may
have an _OSC method by which the OS can ask the platform for control of
PCIe features like native hotplug, power management events, AER, etc.

Previously, if we found a bridge without an ACPI device, we assumed we did
not have permission to use any of these PCIe features.  That seems
unreasonably restrictive.

If we find no ACPI device, assume we can take control of all PCIe features.

The Intel Volume Management Device (VMD) is one such bridge with no ACPI
device.  Prior to this change, users had to boot with "pcie_ports=native"
to get hotplug and other services to work below the VMD Root Port.

[bhelgaas: changelog]
Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>