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: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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5cc62c2022
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@ -20,6 +20,36 @@
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LIST_HEAD(pci_root_buses);
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EXPORT_SYMBOL(pci_root_buses);
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static LIST_HEAD(pci_domain_busn_res_list);
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struct pci_domain_busn_res {
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struct list_head list;
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struct resource res;
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int domain_nr;
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};
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static struct resource *get_pci_domain_busn_res(int domain_nr)
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{
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struct pci_domain_busn_res *r;
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list_for_each_entry(r, &pci_domain_busn_res_list, list)
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if (r->domain_nr == domain_nr)
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return &r->res;
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r = kzalloc(sizeof(*r), GFP_KERNEL);
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if (!r)
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return NULL;
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r->domain_nr = domain_nr;
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r->res.start = 0;
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r->res.end = 0xff;
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r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
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list_add_tail(&r->list, &pci_domain_busn_res_list);
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return &r->res;
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}
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static int find_anything(struct device *dev, void *data)
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{
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return 1;
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