Commit b3e65e1f authored Nov 03, 2012 by Yinghai Lu Committed by Bjorn Helgaas Jan 07, 2013

x86/PCI: Implement pcibios_resource_survey_bus()



During testing remove/rescan root bus 00, found
[  338.142574] bus: 'pci': really_probe: probing driver ata_piix with device 0000:00:01.1
[  338.146788] ata_piix 0000:00:01.1: device not available (can't reserve [io  0x01f0-0x01f7])
[  338.150565] ata_piix: probe of 0000:00:01.1 failed with error -22

because that fixed resource is not claimed.
For bootint path it is claimed in  from
        arch/x86/pci/i386.c::pcibios_allocate_resources()

Claim those resources, so on the remove/rescan will still use old
resources.

It is some kind honoring FW setting in the registers during hot add.
esp root-bus hot add is through acpi, BIOS has chance to set some registers
before handing over.

[bhelgaas: move weak definition to patch that uses it]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 3c449ed0

arch/x86/pci/i386.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -352,6 +352,19 @@ static int __init pcibios_assign_resources(void)
		return 0;
		}

		void pcibios_resource_survey_bus(struct pci_bus *bus)
		{
		dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n");

		pcibios_allocate_bus_resources(bus);

		pcibios_allocate_resources(bus, 0);
		pcibios_allocate_resources(bus, 1);

		if (!(pci_probe & PCI_ASSIGN_ROMS))
		pcibios_allocate_rom_resources(bus);
		}

		void __init pcibios_resource_survey(void)
		{
		struct pci_bus *bus;

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