1 What: /sys/bus/pci/drivers/.../bind
3 Contact: linux-pci@vger.kernel.org
5 Writing a device location to this file will cause
6 the driver to attempt to bind to the device found at
7 this location. This is useful for overriding default
8 bindings. The format for the location is: DDDD:BB:DD.F.
9 That is Domain:Bus:Device.Function and is the same as
10 found in /sys/bus/pci/devices/. For example:
11 # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
12 (Note: kernels before 2.6.28 may require echo -n).
14 What: /sys/bus/pci/drivers/.../unbind
16 Contact: linux-pci@vger.kernel.org
18 Writing a device location to this file will cause the
19 driver to attempt to unbind from the device found at
20 this location. This may be useful when overriding default
21 bindings. The format for the location is: DDDD:BB:DD.F.
22 That is Domain:Bus:Device.Function and is the same as
23 found in /sys/bus/pci/devices/. For example:
24 # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
25 (Note: kernels before 2.6.28 may require echo -n).
27 What: /sys/bus/pci/drivers/.../new_id
29 Contact: linux-pci@vger.kernel.org
31 Writing a device ID to this file will attempt to
32 dynamically add a new device ID to a PCI device driver.
33 This may allow the driver to support more hardware than
34 was included in the driver's static device ID support
35 table at compile time. The format for the device ID is:
36 VVVV DDDD SVVV SDDD CCCC MMMM PPPP. That is Vendor ID,
37 Device ID, Subsystem Vendor ID, Subsystem Device ID,
38 Class, Class Mask, and Private Driver Data. The Vendor ID
39 and Device ID fields are required, the rest are optional.
40 Upon successfully adding an ID, the driver will probe
41 for the device and attempt to bind to it. For example:
42 # echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
44 What: /sys/bus/pci/drivers/.../remove_id
46 Contact: Chris Wright <chrisw@sous-sol.org>
48 Writing a device ID to this file will remove an ID
49 that was dynamically added via the new_id sysfs entry.
50 The format for the device ID is:
51 VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
52 ID, Subsystem Vendor ID, Subsystem Device ID, Class,
53 and Class Mask. The Vendor ID and Device ID fields are
54 required, the rest are optional. After successfully
55 removing an ID, the driver will no longer support the
56 device. This is useful to ensure auto probing won't
57 match the driver to the device. For example:
58 # echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
60 What: /sys/bus/pci/rescan
62 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
64 Writing a non-zero value to this attribute will
65 force a rescan of all PCI buses in the system, and
66 re-discover previously removed devices.
67 Depends on CONFIG_HOTPLUG.
69 What: /sys/bus/pci/devices/.../remove
71 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
73 Writing a non-zero value to this attribute will
74 hot-remove the PCI device and any of its children.
75 Depends on CONFIG_HOTPLUG.
77 What: /sys/bus/pci/devices/.../pci_bus/.../rescan
79 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
81 Writing a non-zero value to this attribute will
82 force a rescan of the bus and all child buses,
83 and re-discover devices removed earlier from this
84 part of the device tree. Depends on CONFIG_HOTPLUG.
86 What: /sys/bus/pci/devices/.../rescan
88 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
90 Writing a non-zero value to this attribute will
91 force a rescan of the device's parent bus and all
92 child buses, and re-discover devices removed earlier
93 from this part of the device tree.
94 Depends on CONFIG_HOTPLUG.
96 What: /sys/bus/pci/devices/.../reset
98 Contact: Michael S. Tsirkin <mst@redhat.com>
100 Some devices allow an individual function to be reset
101 without affecting other functions in the same device.
102 For devices that have this support, a file named reset
103 will be present in sysfs. Writing 1 to this file
106 What: /sys/bus/pci/devices/.../vpd
108 Contact: Ben Hutchings <bhutchings@solarflare.com>
110 A file named vpd in a device directory will be a
111 binary file containing the Vital Product Data for the
112 device. It should follow the VPD format defined in
113 PCI Specification 2.1 or 2.2, but users should consider
114 that some devices may have malformatted data. If the
115 underlying VPD has a writable section then the
116 corresponding section of this file will be writable.
118 What: /sys/bus/pci/devices/.../virtfnN
120 Contact: Yu Zhao <yu.zhao@intel.com>
122 This symbolic link appears when hardware supports the SR-IOV
123 capability and the Physical Function driver has enabled it.
124 The symbolic link points to the PCI device sysfs entry of the
125 Virtual Function whose index is N (0...MaxVFs-1).
127 What: /sys/bus/pci/devices/.../dep_link
129 Contact: Yu Zhao <yu.zhao@intel.com>
131 This symbolic link appears when hardware supports the SR-IOV
132 capability and the Physical Function driver has enabled it,
133 and this device has vendor specific dependencies with others.
134 The symbolic link points to the PCI device sysfs entry of
135 Physical Function this device depends on.
137 What: /sys/bus/pci/devices/.../physfn
139 Contact: Yu Zhao <yu.zhao@intel.com>
141 This symbolic link appears when a device is a Virtual Function.
142 The symbolic link points to the PCI device sysfs entry of the
143 Physical Function this device associates with.
145 What: /sys/bus/pci/slots/.../module
147 Contact: linux-pci@vger.kernel.org
149 This symbolic link points to the PCI hotplug controller driver
150 module that manages the hotplug slot.
152 What: /sys/bus/pci/devices/.../label
154 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
156 Reading this attribute will provide the firmware
157 given name (SMBIOS type 41 string or ACPI _DSM string) of
158 the PCI device. The attribute will be created only
159 if the firmware has given a name to the PCI device.
160 ACPI _DSM string name will be given priority if the
161 system firmware provides SMBIOS type 41 string also.
163 Userspace applications interested in knowing the
164 firmware assigned name of the PCI device.
166 What: /sys/bus/pci/devices/.../index
168 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
170 Reading this attribute will provide the firmware
171 given instance (SMBIOS type 41 device type instance) of the
172 PCI device. The attribute will be created only if the firmware
173 has given an instance number to the PCI device.
175 Userspace applications interested in knowing the
176 firmware assigned device type instance of the PCI
177 device that can help in understanding the firmware
178 intended order of the PCI device.
180 What: /sys/bus/pci/devices/.../acpi_index
182 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
184 Reading this attribute will provide the firmware
185 given instance (ACPI _DSM instance number) of the PCI device.
186 The attribute will be created only if the firmware has given
187 an instance number to the PCI device. ACPI _DSM instance number
188 will be given priority if the system firmware provides SMBIOS
189 type 41 device type instance also.
191 Userspace applications interested in knowing the
192 firmware assigned instance number of the PCI
193 device that can help in understanding the firmware
194 intended order of the PCI device.