From 5cc62c202211096ec26309722ec27455d52c8726 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Thu, 17 May 2012 18:51:11 -0700 Subject: [PATCH] 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 Signed-off-by: Bjorn Helgaas --- drivers/pci/probe.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 651b096134dc..674a477a6486 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -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; -- 2.39.5