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PCI: Introduce /sys/bus/pci/devices/.../rescan 

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>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alex Chiang 2009-03-20 14:56:41 -06:00 committed by Jesse Barnes
parent 77c27c7b49
commit 738a6396c2
2 changed files with 29 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-bus-pci
View File

@ -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>

19
drivers/pci/pci-sysfs.c
View File

@ -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,
};