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PCI/ACPI: Reserve firmware-allocated resources for hot-added root buses

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Firmware may have assigned PCI BARs for hot-added devices, so reserve
those resources before trying to allocate more.

[bhelgaas: move empty weak definition here]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2012-11-03 21:39:31 -07:00 committed by Bjorn Helgaas
parent b95168e010
commit 3c449ed007
3 changed files with 6 additions and 1 deletions
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4
drivers/acpi/pci_root.c
View File

@ -650,8 +650,10 @@ static int acpi_pci_root_start(struct acpi_device *device)
struct acpi_pci_root *root = acpi_driver_data(device);
struct acpi_pci_driver *driver;
if (system_state != SYSTEM_BOOTING)
if (system_state != SYSTEM_BOOTING) {
pcibios_resource_survey_bus(root->bus);
pci_assign_unassigned_bus_resources(root->bus);
}
mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)

2
drivers/pci/bus.c
View File

@ -158,6 +158,8 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
return ret;
}
void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
/**
* pci_bus_add_device - add a single device
* @dev: device to add

1
include/linux/pci.h
View File

@ -674,6 +674,7 @@ extern struct list_head pci_root_buses; /* list of all known PCI buses */
/* Some device drivers need know if pci is initiated */
extern int no_pci_devices(void);
void pcibios_resource_survey_bus(struct pci_bus *bus);
void pcibios_fixup_bus(struct pci_bus *);
int __must_check pcibios_enable_device(struct pci_dev *, int mask);
/* Architecture specific versions may override this (weak) */