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/.../msi_irqs/
71 Contact: Neil Horman <nhorman@tuxdriver.com>
73 The /sys/devices/.../msi_irqs directory contains a variable set
74 of sub-directories, with each sub-directory being named after a
75 corresponding msi irq vector allocated to that device. Each
76 numbered sub-directory N contains attributes of that irq.
77 Note that this directory is not created for device drivers which
78 do not support msi irqs
80 What: /sys/bus/pci/devices/.../msi_irqs/<N>/mode
82 Contact: Neil Horman <nhorman@tuxdriver.com>
84 This attribute indicates the mode that the irq vector named by
85 the parent directory is in (msi vs. msix)
87 What: /sys/bus/pci/devices/.../remove
89 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
91 Writing a non-zero value to this attribute will
92 hot-remove the PCI device and any of its children.
93 Depends on CONFIG_HOTPLUG.
95 What: /sys/bus/pci/devices/.../pci_bus/.../rescan
97 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
99 Writing a non-zero value to this attribute will
100 force a rescan of the bus and all child buses,
101 and re-discover devices removed earlier from this
102 part of the device tree. Depends on CONFIG_HOTPLUG.
104 What: /sys/bus/pci/devices/.../rescan
106 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
108 Writing a non-zero value to this attribute will
109 force a rescan of the device's parent bus and all
110 child buses, and re-discover devices removed earlier
111 from this part of the device tree.
112 Depends on CONFIG_HOTPLUG.
114 What: /sys/bus/pci/devices/.../reset
116 Contact: Michael S. Tsirkin <mst@redhat.com>
118 Some devices allow an individual function to be reset
119 without affecting other functions in the same device.
120 For devices that have this support, a file named reset
121 will be present in sysfs. Writing 1 to this file
124 What: /sys/bus/pci/devices/.../vpd
126 Contact: Ben Hutchings <bhutchings@solarflare.com>
128 A file named vpd in a device directory will be a
129 binary file containing the Vital Product Data for the
130 device. It should follow the VPD format defined in
131 PCI Specification 2.1 or 2.2, but users should consider
132 that some devices may have malformatted data. If the
133 underlying VPD has a writable section then the
134 corresponding section of this file will be writable.
136 What: /sys/bus/pci/devices/.../virtfnN
138 Contact: Yu Zhao <yu.zhao@intel.com>
140 This symbolic link appears when hardware supports the SR-IOV
141 capability and the Physical Function driver has enabled it.
142 The symbolic link points to the PCI device sysfs entry of the
143 Virtual Function whose index is N (0...MaxVFs-1).
145 What: /sys/bus/pci/devices/.../dep_link
147 Contact: Yu Zhao <yu.zhao@intel.com>
149 This symbolic link appears when hardware supports the SR-IOV
150 capability and the Physical Function driver has enabled it,
151 and this device has vendor specific dependencies with others.
152 The symbolic link points to the PCI device sysfs entry of
153 Physical Function this device depends on.
155 What: /sys/bus/pci/devices/.../physfn
157 Contact: Yu Zhao <yu.zhao@intel.com>
159 This symbolic link appears when a device is a Virtual Function.
160 The symbolic link points to the PCI device sysfs entry of the
161 Physical Function this device associates with.
163 What: /sys/bus/pci/slots/.../module
165 Contact: linux-pci@vger.kernel.org
167 This symbolic link points to the PCI hotplug controller driver
168 module that manages the hotplug slot.
170 What: /sys/bus/pci/devices/.../label
172 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
174 Reading this attribute will provide the firmware
175 given name (SMBIOS type 41 string or ACPI _DSM string) of
176 the PCI device. The attribute will be created only
177 if the firmware has given a name to the PCI device.
178 ACPI _DSM string name will be given priority if the
179 system firmware provides SMBIOS type 41 string also.
181 Userspace applications interested in knowing the
182 firmware assigned name of the PCI device.
184 What: /sys/bus/pci/devices/.../index
186 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
188 Reading this attribute will provide the firmware
189 given instance (SMBIOS type 41 device type instance) of the
190 PCI device. The attribute will be created only if the firmware
191 has given an instance number to the PCI device.
193 Userspace applications interested in knowing the
194 firmware assigned device type instance of the PCI
195 device that can help in understanding the firmware
196 intended order of the PCI device.
198 What: /sys/bus/pci/devices/.../acpi_index
200 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
202 Reading this attribute will provide the firmware
203 given instance (ACPI _DSM instance number) of the PCI device.
204 The attribute will be created only if the firmware has given
205 an instance number to the PCI device. ACPI _DSM instance number
206 will be given priority if the system firmware provides SMBIOS
207 type 41 device type instance also.
209 Userspace applications interested in knowing the
210 firmware assigned instance number of the PCI
211 device that can help in understanding the firmware
212 intended order of the PCI device.