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 | 20 ++++++++++++++++++++
2 files changed, 30 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 e4d2c0d..6e5f141 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -220,6 +220,25 @@ 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_do_scan_bus(pdev->bus);
+
+ return count;
+}
+
static void remove_callback(void *data)
{
struct pci_dev *pdev = (struct pci_dev *)data;
@@ -268,6 +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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