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    Subject[PATCH v5 10/13] 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>
    Signed-off-by: Alex Chiang <achiang@hp.com>
    ---

    Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++
    drivers/pci/pci-sysfs.c | 19 +++++++++++++++++++
    2 files changed, 29 insertions(+), 0 deletions(-)

    diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
    index 1350fa6..ba0f0e7 100644
    --- a/Documentation/ABI/testing/sysfs-bus-pci
    +++ b/Documentation/ABI/testing/sysfs-bus-pci
    @@ -74,6 +74,16 @@ 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 e16990e..e9a8706 100644
    --- a/drivers/pci/pci-sysfs.c
    +++ b/drivers/pci/pci-sysfs.c
    @@ -244,6 +244,24 @@ struct bus_attribute pci_bus_attrs[] = {
    __ATTR_NULL
    };

    +static ssize_t
    +dev_rescan_store(struct device *dev, struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned long val;
    + struct pci_dev *pdev = to_pci_dev(dev);
    +
    + if (strict_strtoul(buf, 0, &val) < 0)
    + return -EINVAL;
    +
    + if (val) {
    + mutex_lock(&pci_remove_rescan_mutex);
    + pci_rescan_bus(pdev->bus);
    + mutex_unlock(&pci_remove_rescan_mutex);
    + }
    + return count;
    +}
    +
    static void remove_callback(struct device *dev)
    {
    struct pci_dev *pdev = to_pci_dev(dev);
    @@ -298,6 +316,7 @@ struct device_attribute pci_dev_attrs[] = {
    __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
    #ifdef CONFIG_HOTPLUG
    __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
    + __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
    #endif
    __ATTR_NULL,
    };


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