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authorYinghai Lu <yinghai@kernel.org>2012-05-17 18:51:11 -0700
committerBjorn Helgaas <bhelgaas@google.com>2012-06-13 15:42:22 -0600
commit5cc62c202211096ec26309722ec27455d52c8726 (patch)
tree10813ef6be2b7bbb176cc37d3127704586e448f6 /drivers/pci/probe.c
parent3527ed81ca01bbaf09df952e68528377a9cd092f (diff)
downloadop-kernel-dev-5cc62c202211096ec26309722ec27455d52c8726.zip
op-kernel-dev-5cc62c202211096ec26309722ec27455d52c8726.tar.gz
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>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 651b096..674a477 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;
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