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Commit 45ca9e97 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Jesse Barnes
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PCI: add helpers for building PCI bus resource lists 



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: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent afd24ece

drivers/pci/bus.c

+27 −5
Original line number Diff line number Diff line
@@ -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);

}



/**

include/linux/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -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);