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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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