PCI: add busn_res operation functions

Will use them insert/update busn res in pci_bus struct.

[bhelgaas: print conflicting entry if insertion fails]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 674a477a6486..7662ab7b2640 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1714,6 +1714,74 @@ err_out:
         return NULL;
 }
 
+int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
+{
+        struct resource *res = &b->busn_res;
+        struct resource *parent_res, *conflict;
+
+        res->start = bus;
+        res->end = bus_max;
+        res->flags = IORESOURCE_BUS;
+
+        if (!pci_is_root_bus(b))
+                parent_res = &b->parent->busn_res;
+        else {
+                parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
+                res->flags |= IORESOURCE_PCI_FIXED;
+        }
+
+        conflict = insert_resource_conflict(parent_res, res);
+
+        if (conflict)
+                dev_printk(KERN_DEBUG, &b->dev,
+                           "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
+                            res, pci_is_root_bus(b) ? "domain " : "",
+                            parent_res, conflict->name, conflict);
+        else
+                dev_printk(KERN_DEBUG, &b->dev,
+                           "busn_res: %pR is inserted under %s%pR\n",
+                           res, pci_is_root_bus(b) ? "domain " : "",
+                           parent_res);
+
+        return conflict == NULL;
+}
+
+int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
+{
+        struct resource *res = &b->busn_res;
+        struct resource old_res = *res;
+        resource_size_t size;
+        int ret;
+
+        if (res->start > bus_max)
+                return -EINVAL;
+
+        size = bus_max - res->start + 1;
+        ret = adjust_resource(res, res->start, size);
+        dev_printk(KERN_DEBUG, &b->dev,
+                        "busn_res: %pR end %s updated to %02x\n",
+                        &old_res, ret ? "can not be" : "is", bus_max);
+
+        if (!ret && !res->parent)
+                pci_bus_insert_busn_res(b, res->start, res->end);
+
+        return ret;
+}
+
+void pci_bus_release_busn_res(struct pci_bus *b)
+{
+        struct resource *res = &b->busn_res;
+        int ret;
+
+        if (!res->flags || !res->parent)
+                return;
+
+        ret = release_resource(res);
+        dev_printk(KERN_DEBUG, &b->dev,
+                        "busn_res: %pR %s released\n",
+                        res, ret ? "can not be" : "is");
+}
+
 struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
                 struct pci_ops *ops, void *sysdata, struct list_head *resources)
 {