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Some devices allow an individual function to be reset without affecting other functions in the same device: that's what pci_reset_function does. For devices that have this support, expose reset attribite in sysfs. This is useful e.g. for virtualization, where a qemu userspace process wants to reset the device when the guest is reset, to emulate machine reboot as closely as possible. Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
142 lines
5.5 KiB
Plaintext
142 lines
5.5 KiB
Plaintext
What: /sys/bus/pci/drivers/.../bind
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Date: December 2003
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Contact: linux-pci@vger.kernel.org
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Description:
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Writing a device location to this file will cause
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the driver to attempt to bind to the device found at
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this location. This is useful for overriding default
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bindings. The format for the location is: DDDD:BB:DD.F.
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That is Domain:Bus:Device.Function and is the same as
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found in /sys/bus/pci/devices/. For example:
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# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
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(Note: kernels before 2.6.28 may require echo -n).
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What: /sys/bus/pci/drivers/.../unbind
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Date: December 2003
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Contact: linux-pci@vger.kernel.org
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Description:
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Writing a device location to this file will cause the
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driver to attempt to unbind from the device found at
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this location. This may be useful when overriding default
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bindings. The format for the location is: DDDD:BB:DD.F.
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That is Domain:Bus:Device.Function and is the same as
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found in /sys/bus/pci/devices/. For example:
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# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
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(Note: kernels before 2.6.28 may require echo -n).
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What: /sys/bus/pci/drivers/.../new_id
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Date: December 2003
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Contact: linux-pci@vger.kernel.org
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Description:
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Writing a device ID to this file will attempt to
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dynamically add a new device ID to a PCI device driver.
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This may allow the driver to support more hardware than
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was included in the driver's static device ID support
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table at compile time. The format for the device ID is:
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VVVV DDDD SVVV SDDD CCCC MMMM PPPP. That is Vendor ID,
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Device ID, Subsystem Vendor ID, Subsystem Device ID,
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Class, Class Mask, and Private Driver Data. The Vendor ID
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and Device ID fields are required, the rest are optional.
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Upon successfully adding an ID, the driver will probe
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for the device and attempt to bind to it. For example:
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# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
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What: /sys/bus/pci/drivers/.../remove_id
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Date: February 2009
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Contact: Chris Wright <chrisw@sous-sol.org>
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Description:
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Writing a device ID to this file will remove an ID
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that was dynamically added via the new_id sysfs entry.
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The format for the device ID is:
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VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
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ID, Subsystem Vendor ID, Subsystem Device ID, Class,
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and Class Mask. The Vendor ID and Device ID fields are
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required, the rest are optional. After successfully
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removing an ID, the driver will no longer support the
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device. This is useful to ensure auto probing won't
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match the driver to the device. For example:
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# echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
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What: /sys/bus/pci/rescan
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Date: January 2009
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Contact: Linux PCI developers <linux-pci@vger.kernel.org>
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Description:
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Writing a non-zero value to this attribute will
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force a rescan of all PCI buses in the system, and
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re-discover previously removed devices.
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Depends on CONFIG_HOTPLUG.
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What: /sys/bus/pci/devices/.../remove
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Date: January 2009
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Contact: Linux PCI developers <linux-pci@vger.kernel.org>
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Description:
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Writing a non-zero value to this attribute will
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hot-remove the PCI device and any of its children.
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Depends on CONFIG_HOTPLUG.
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What: /sys/bus/pci/devices/.../rescan
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Date: January 2009
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Contact: Linux PCI developers <linux-pci@vger.kernel.org>
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Description:
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Writing a non-zero value to this attribute will
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force a rescan of the device's parent bus and all
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child buses, and re-discover devices removed earlier
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from this part of the device tree.
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Depends on CONFIG_HOTPLUG.
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What: /sys/bus/pci/devices/.../reset
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Date: July 2009
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Contact: Michael S. Tsirkin <mst@redhat.com>
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Description:
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Some devices allow an individual function to be reset
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without affecting other functions in the same device.
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For devices that have this support, a file named reset
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will be present in sysfs. Writing 1 to this file
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will perform reset.
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What: /sys/bus/pci/devices/.../vpd
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Date: February 2008
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Contact: Ben Hutchings <bhutchings@solarflare.com>
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Description:
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A file named vpd in a device directory will be a
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binary file containing the Vital Product Data for the
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device. It should follow the VPD format defined in
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PCI Specification 2.1 or 2.2, but users should consider
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that some devices may have malformatted data. If the
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underlying VPD has a writable section then the
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corresponding section of this file will be writable.
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What: /sys/bus/pci/devices/.../virtfnN
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Date: March 2009
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Contact: Yu Zhao <yu.zhao@intel.com>
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Description:
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This symbolic link appears when hardware supports the SR-IOV
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capability and the Physical Function driver has enabled it.
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The symbolic link points to the PCI device sysfs entry of the
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Virtual Function whose index is N (0...MaxVFs-1).
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What: /sys/bus/pci/devices/.../dep_link
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Date: March 2009
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Contact: Yu Zhao <yu.zhao@intel.com>
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Description:
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This symbolic link appears when hardware supports the SR-IOV
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capability and the Physical Function driver has enabled it,
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and this device has vendor specific dependencies with others.
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The symbolic link points to the PCI device sysfs entry of
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Physical Function this device depends on.
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What: /sys/bus/pci/devices/.../physfn
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Date: March 2009
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Contact: Yu Zhao <yu.zhao@intel.com>
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Description:
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This symbolic link appears when a device is a Virtual Function.
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The symbolic link points to the PCI device sysfs entry of the
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Physical Function this device associates with.
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What: /sys/bus/pci/slots/.../module
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Date: June 2009
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Contact: linux-pci@vger.kernel.org
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Description:
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This symbolic link points to the PCI hotplug controller driver
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module that manages the hotplug slot.
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