Will use them insert/update busn res in pci_bus struct.
-v2: use update_resource() requested by Bjorn.
-v3: use domain_busn_res as root bus busn_res parent.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/probe.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 3 ++
2 files changed, 66 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 674a477..bfbf064 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1714,6 +1714,69 @@ 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;
+ int ret;
+
+ 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;
+ }
+
+ ret = insert_resource(parent_res, res);
+
+ dev_printk(KERN_DEBUG, &b->dev,
+ "busn_res: %pR %s inserted under %s %pR\n",
+ res, ret ? "can not be" : "is",
+ pci_is_root_bus(b) ? "domain":"", parent_res);
+
+ return ret;
+}
+
+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)
{
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d588ef4..b5f2cc7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -667,6 +667,9 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
+int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
+int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
+void pci_bus_release_busn_res(struct pci_bus *b);
struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
--
1.7.7
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