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PCI: add helpers for building PCI bus resource lists

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We'd like to supply a list of resources when we create a new PCI bus,
e.g., the root bus under a PCI host bridge.  These are helpers for
constructing that list.

These are exported because the plan is to replace this exported interface:
    pci_scan_bus_parented()
with this one:
    pci_add_resource(resources, ...)
    pci_scan_root_bus(..., resources)

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2011-10-28 16:25:35 -06:00 committed by Jesse Barnes
parent afd24ece5c
commit 45ca9e9730
2 changed files with 29 additions and 5 deletions
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32
drivers/pci/bus.c
View File

@ -18,6 +18,32 @@
#include "pci.h"
void pci_add_resource(struct list_head *resources, struct resource *res)
{
struct pci_bus_resource *bus_res;
bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
if (!bus_res) {
printk(KERN_ERR "PCI: can't add bus resource %pR\n", res);
return;
}
bus_res->res = res;
list_add_tail(&bus_res->list, resources);
}
EXPORT_SYMBOL(pci_add_resource);
void pci_free_resource_list(struct list_head *resources)
{
struct pci_bus_resource *bus_res, *tmp;
list_for_each_entry_safe(bus_res, tmp, resources, list) {
list_del(&bus_res->list);
kfree(bus_res);
}
}
EXPORT_SYMBOL(pci_free_resource_list);
void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
unsigned int flags)
{
@ -52,16 +78,12 @@ EXPORT_SYMBOL_GPL(pci_bus_resource_n);
void pci_bus_remove_resources(struct pci_bus *bus)
{
struct pci_bus_resource *bus_res, *tmp;
int i;
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
bus->resource[i] = NULL;
list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
list_del(&bus_res->list);
kfree(bus_res);
}
pci_free_resource_list(&bus->resources);
}
/**

2
include/linux/pci.h
View File

@ -917,6 +917,8 @@ int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
void pci_release_selected_regions(struct pci_dev *, int);
/* drivers/pci/bus.c */
void pci_add_resource(struct list_head *resources, struct resource *res);
void pci_free_resource_list(struct list_head *resources);
void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
void pci_bus_remove_resources(struct pci_bus *bus);