Commit 8fd4391e authored Dec 02, 2016 by Bjorn Helgaas Committed by Bjorn Helgaas Dec 06, 2016

arm64: PCI: Exclude ACPI "consumer" resources from host bridge windows

On x86 and ia64, we have treated all ACPI _CRS resources of PNP0A03 host
bridge devices as "producers", i.e., as host bridge windows. That's partly
because some x86 BIOSes improperly used "consumer" descriptors to describe
windows and partly because Linux didn't have good support for handling
consumer and producer descriptors differently.

One result is that x86 BIOSes describe host bridge "consumer" resources in
the _CRS of a PNP0C02 device, not the PNP0A03 device itself. On arm64 we
don't have a legacy of firmware that has this consumer/producer confusion,
so we can handle PNP0A03 "consumer" descriptors as host bridge registers
instead of windows.

Exclude non-window ("consumer") resources from the list of host bridge
windows. This allows the use of "consumer" PNP0A03 descriptors for bridge
register space.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 093d24a2

arch/arm64/kernel/pci.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -114,6 +114,19 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
		return 0;
		}

		static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
		{
		struct resource_entry entry, tmp;
		int status;

		status = acpi_pci_probe_root_resources(ci);
		resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
		if (!(entry->res->flags & IORESOURCE_WINDOW))
		resource_list_destroy_entry(entry);
		}
		return status;
		}

		/*
		* Lookup the bus range for the domain in MCFG, and set up config space
		* mapping.
		@@ -196,6 +209,7 @@ struct pci_bus pci_acpi_scan_root(struct acpi_pci_root root)
		}

		root_ops->release_info = pci_acpi_generic_release_info;
		root_ops->prepare_resources = pci_acpi_root_prepare_resources;
		root_ops->pci_ops = &ri->cfg->ops->pci_ops;
		bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
		if (!bus)