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PCI: Add generic pci_bus_claim_resources()

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All PCI resources (bridge windows and BARs) should be inserted in the
iomem_resource and ioport_resource trees so we know what space is occupied
and what is available for other devices.  There's nothing arch-specific
about this, but it is currently done by arch-specific code.

Add a generic pci_bus_claim_resources() interface so we can migrate away
from the arch-specific code.

[bhelgaas: changelog]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
Lorenzo Pieralisi 2016-06-08 12:04:47 +01:00 committed by Bjorn Helgaas
parent caa8e9323e
commit 765bf9b739
2 changed files with 69 additions and 0 deletions
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68
drivers/pci/setup-bus.c
View File

@ -1423,6 +1423,74 @@ void pci_bus_assign_resources(const struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_assign_resources);
static void pci_claim_device_resources(struct pci_dev *dev)
{
int i;
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (!r->flags || r->parent)
continue;
pci_claim_resource(dev, i);
}
}
static void pci_claim_bridge_resources(struct pci_dev *dev)
{
int i;
for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (!r->flags || r->parent)
continue;
pci_claim_bridge_resource(dev, i);
}
}
static void pci_bus_allocate_dev_resources(struct pci_bus *b)
{
struct pci_dev *dev;
struct pci_bus *child;
list_for_each_entry(dev, &b->devices, bus_list) {
pci_claim_device_resources(dev);
child = dev->subordinate;
if (child)
pci_bus_allocate_dev_resources(child);
}
}
static void pci_bus_allocate_resources(struct pci_bus *b)
{
struct pci_bus *child;
/*
* Carry out a depth-first search on the PCI bus
* tree to allocate bridge apertures. Read the
* programmed bridge bases and recursively claim
* the respective bridge resources.
*/
if (b->self) {
pci_read_bridge_bases(b);
pci_claim_bridge_resources(b->self);
}
list_for_each_entry(child, &b->children, node)
pci_bus_allocate_resources(child);
}
void pci_bus_claim_resources(struct pci_bus *b)
{
pci_bus_allocate_resources(b);
pci_bus_allocate_dev_resources(b);
}
EXPORT_SYMBOL(pci_bus_claim_resources);
static void __pci_bridge_assign_resources(const struct pci_dev *bridge,
struct list_head *add_head,
struct list_head *fail_head)

1
include/linux/pci.h
View File

@ -1114,6 +1114,7 @@ int pci_set_vpd_size(struct pci_dev *dev, size_t len);
/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_claim_resources(struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
int pci_claim_bridge_resource(struct pci_dev *bridge, int i);