[PATCH 04/21] PCI: Add busn_res for pci domain.

[Yinghai Lu]

pci root bus busn_res will be registered under that.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 drivers/pci/probe.c |   30 ++++++++++++++++++++++++++++++
 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;
-- 
1.7.7

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