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@xxxxxxxxxxxxx> Cc: djwong@xxxxxxxxxx Reviewed-by: James Cameron <qz@xxxxxx> Signed-off-by: Alex Chiang <achiang@xxxxxx> --- 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@xxxxxxxxxxxxxxx> +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@xxxxxxxxxxxxxx> 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, }; -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html