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Commit 738a6396 authored by Alex Chiang's avatar Alex Chiang Committed by Jesse Barnes
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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: default avatarAlex Chiang <achiang@hp.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 77c27c7b

Documentation/ABI/testing/sysfs-bus-pci

+10 −0
Original line number Diff line number Diff line
@@ -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>

drivers/pci/pci-sysfs.c

+19 −0
Original line number Diff line number Diff line
@@ -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,

};