Commit b3e65e1f authored by Yinghai Lu's avatar Yinghai Lu Committed by Bjorn Helgaas

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: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 3c449ed0
......@@ -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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