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Date: Fri, 20 Mar 2009 14:56:25 -0600
From: Alex Chiang <achiang@...com>
To: jbarnes@...tuousgeek.org
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Alex Chiang <achiang@...com>
Subject: [PATCH v5 07/13] PCI: Introduce pci_rescan_bus()
This API is used by the PCI core to rescan a bus and rediscover
newly added devices.
Over time, it is expected that the various PCI hotplug drivers
will migrate to this interface and away from the old
pci_do_scan_bus() interface.
Signed-off-by: Alex Chiang <achiang@...com>
---
drivers/pci/hotplug/fakephp.c | 6 +++---
drivers/pci/probe.c | 32 ++++++++++++++++++++++++++++++++
include/linux/pci.h | 3 +++
3 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
index d8649e1..1606374 100644
--- a/drivers/pci/hotplug/fakephp.c
+++ b/drivers/pci/hotplug/fakephp.c
@@ -245,12 +245,12 @@ static int pci_rescan_slot(struct pci_dev *temp)
/**
- * pci_rescan_bus - Rescan PCI bus
+ * pci_rescan_bus_local - fakephp version of rescan PCI bus
* @bus: the PCI bus to rescan
*
* Call pci_rescan_slot for each possible function of the bus.
*/
-static void pci_rescan_bus(const struct pci_bus *bus)
+static void pci_rescan_bus_local(const struct pci_bus *bus)
{
unsigned int devfn;
struct pci_dev *dev;
@@ -291,7 +291,7 @@ static void pci_rescan_buses(const struct list_head *list)
const struct list_head *l;
list_for_each(l,list) {
const struct pci_bus *b = pci_bus_b(l);
- pci_rescan_bus(b);
+ pci_rescan_bus_local(b);
pci_rescan_buses(&b->children);
}
}
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b75ed4b..53edb7e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1203,6 +1203,38 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
EXPORT_SYMBOL(pci_scan_bus_parented);
#ifdef CONFIG_HOTPLUG
+/**
+ * pci_rescan_bus - scan a PCI bus for devices.
+ * @bus: PCI bus to scan
+ *
+ * Scan a PCI bus and child buses for new devices, adds them,
+ * and enables them.
+ *
+ * Returns the max number of subordinate bus discovered.
+ */
+unsigned int __devinit pci_rescan_bus(struct pci_bus *bus)
+{
+ unsigned int max;
+ struct pci_dev *dev;
+
+ max = pci_scan_child_bus(bus);
+
+ up_read(&pci_bus_sem);
+ list_for_each_entry(dev, &bus->devices, bus_list)
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+ dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+ if (dev->subordinate)
+ pci_bus_size_bridges(dev->subordinate);
+ down_read(&pci_bus_sem);
+
+ pci_bus_assign_resources(bus);
+ pci_enable_bridges(bus);
+ pci_bus_add_devices(bus);
+
+ return max;
+}
+EXPORT_SYMBOL_GPL(pci_rescan_bus);
+
EXPORT_SYMBOL(pci_add_new_bus);
EXPORT_SYMBOL(pci_scan_slot);
EXPORT_SYMBOL(pci_scan_bridge);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 72ccf15..39e3029 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -710,6 +710,9 @@ int pci_back_from_sleep(struct pci_dev *dev);
/* Functions for PCI Hotplug drivers to use */
int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
+#ifdef CONFIG_HOTPLUG
+unsigned int pci_rescan_bus(struct pci_bus *bus);
+#endif
/* Vital product data routines */
ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
--
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