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authorChris Wright <chrisw@sous-sol.org>2009-02-23 21:52:23 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-03-20 10:48:11 -0700
commit0994375e9614f78657031e04e30019b9cdb62795 (patch)
tree471d1eb44d5d9c6351bb55cb6187fb30c1112316 /Documentation
parent13bf75766966e1bcc71fae536988caec312eef8f (diff)
downloadlinux-0994375e9614f78657031e04e30019b9cdb62795.tar.bz2
PCI: add remove_id sysfs entry
This adds a remove_id sysfs entry to allow users of new_id to later remove the added dynid. One use case is management tools that want to dynamically bind/unbind devices to pci-stub driver while devices are assigned to KVM guests. Rather than having to track which driver was originally bound to the driver, a mangement tool can simply: Guest uses device Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-pci16
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index e638e15a8895..3d29793a0ea2 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -41,6 +41,22 @@ Description:
for the device and attempt to bind to it. For example:
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
+What: /sys/bus/pci/drivers/.../remove_id
+Date: February 2009
+Contact: Chris Wright <chrisw@sous-sol.org>
+Description:
+ Writing a device ID to this file will remove an ID
+ that was dynamically added via the new_id sysfs entry.
+ The format for the device ID is:
+ VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
+ ID, Subsystem Vendor ID, Subsystem Device ID, Class,
+ and Class Mask. The Vendor ID and Device ID fields are
+ required, the rest are optional. After successfully
+ removing an ID, the driver will no longer support the
+ device. This is useful to ensure auto probing won't
+ match the driver to the device. For example:
+ # echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
+
What: /sys/bus/pci/devices/.../vpd
Date: February 2008
Contact: Ben Hutchings <bhutchings@solarflare.com>