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Commit 5cc62c20 authored by Yinghai Lu's avatar Yinghai Lu Committed by Bjorn Helgaas
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PCI: build a bus number resource tree for every domain 



This adds get_pci_domain_busn_res(), which returns the root of the
bus number resource tree for a domain, creating it if necessary.
We will later populate the tree with the bus numbers used by host
bridges and P2P bridges in the domain.

[bhelgaas: changelog]
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 3527ed81

drivers/pci/probe.c

+30 −0
Original line number Diff line number Diff line
@@ -20,6 +20,36 @@ 
LIST_HEAD(pci_root_buses);

EXPORT_SYMBOL(pci_root_buses);



static LIST_HEAD(pci_domain_busn_res_list);



struct pci_domain_busn_res {

	struct list_head list;

	struct resource res;

	int domain_nr;

};



static struct resource *get_pci_domain_busn_res(int domain_nr)

{

	struct pci_domain_busn_res *r;



	list_for_each_entry(r, &pci_domain_busn_res_list, list)

		if (r->domain_nr == domain_nr)

			return &r->res;



	r = kzalloc(sizeof(*r), GFP_KERNEL);

	if (!r)

		return NULL;



	r->domain_nr = domain_nr;

	r->res.start = 0;

	r->res.end = 0xff;

	r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;



	list_add_tail(&r->list, &pci_domain_busn_res_list);



	return &r->res;

}



static int find_anything(struct device *dev, void *data)

{

	return 1;