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Subject[RFC PATCH 06/10] PCI: Introduce /sys/bus/pci/devices/.../rescan
Date
This interface allows the user to force a rescan of the device's
parent bus and all subordinate buses, and rediscover devices removed
earlier from this part of the device tree.

Cc: Trent Piepho <xyzzy@speakeasy.org>
Cc: djwong@us.ibm.com
Reviewed-by: James Cameron <qz@hp.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
---
Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++
drivers/pci/pci-sysfs.c | 22 ++++++++++++++++++++++
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 8c0abc7..f59e963 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -15,6 +15,16 @@ Description:
hot-remove the PCI device and any of its children.
Depends on CONFIG_HOTPLUG.

+What: /sys/bus/pci/devices/.../rescan
+Date: January 2009
+Contact: Linux PCI developers <linux-pci@vger.kernel.org>
+Description:
+ Writing a non-zero value to this attribute will
+ force a rescan of the device's parent bus and all
+ child buses, and re-discover devices removed earlier
+ from this part of the device tree.
+ Depends on CONFIG_HOTPLUG.
+
What: /sys/bus/pci/devices/.../vpd
Date: February 2008
Contact: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index c300242..dcbc8bc 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -220,6 +220,27 @@ msi_bus_store(struct device *dev, struct device_attribute *attr,
}

#ifdef CONFIG_HOTPLUG
+static ssize_t
+dev_rescan_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (val) {
+ pci_scan_child_bus(pdev->bus);
+ pci_bus_add_devices(pdev->bus);
+ }
+
+ return count;
+}
+
static void remove_callback(void *data)
{
pci_remove_bus_device((struct pci_dev *)data);
@@ -266,6 +287,7 @@ struct device_attribute pci_dev_attrs[] = {
__ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
#ifdef CONFIG_HOTPLUG
__ATTR(remove, S_IWUSR, NULL, remove_store),
+ __ATTR(rescan, S_IWUSR, NULL, dev_rescan_store),
#endif
__ATTR_NULL,
};


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