1 What: /sys/bus/pci/drivers/.../bind 1 What: /sys/bus/pci/drivers/.../bind
2 What: /sys/devices/pciX/.../bind <<
3 Date: December 2003 2 Date: December 2003
4 Contact: linux-pci@vger.kernel.org 3 Contact: linux-pci@vger.kernel.org
5 Description: 4 Description:
6 Writing a device location to t 5 Writing a device location to this file will cause
7 the driver to attempt to bind 6 the driver to attempt to bind to the device found at
8 this location. This is useful 7 this location. This is useful for overriding default
9 bindings. The format for the 8 bindings. The format for the location is: DDDD:BB:DD.F.
10 That is Domain:Bus:Device.Func 9 That is Domain:Bus:Device.Function and is the same as
11 found in /sys/bus/pci/devices/ !! 10 found in /sys/bus/pci/devices/. For example:
12 !! 11 # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
13 # echo 0000:00:19.0 > /sys/b <<
14 <<
15 (Note: kernels before 2.6.28 m 12 (Note: kernels before 2.6.28 may require echo -n).
16 13
17 What: /sys/bus/pci/drivers/.../unbin 14 What: /sys/bus/pci/drivers/.../unbind
18 What: /sys/devices/pciX/.../unbind <<
19 Date: December 2003 15 Date: December 2003
20 Contact: linux-pci@vger.kernel.org 16 Contact: linux-pci@vger.kernel.org
21 Description: 17 Description:
22 Writing a device location to t 18 Writing a device location to this file will cause the
23 driver to attempt to unbind fr 19 driver to attempt to unbind from the device found at
24 this location. This may be us 20 this location. This may be useful when overriding default
25 bindings. The format for the 21 bindings. The format for the location is: DDDD:BB:DD.F.
26 That is Domain:Bus:Device.Func 22 That is Domain:Bus:Device.Function and is the same as
27 found in /sys/bus/pci/devices/ !! 23 found in /sys/bus/pci/devices/. For example:
28 !! 24 # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
29 # echo 0000:00:19.0 > /sys/b <<
30 <<
31 (Note: kernels before 2.6.28 m 25 (Note: kernels before 2.6.28 may require echo -n).
32 26
33 What: /sys/bus/pci/drivers/.../new_i 27 What: /sys/bus/pci/drivers/.../new_id
34 What: /sys/devices/pciX/.../new_id <<
35 Date: December 2003 28 Date: December 2003
36 Contact: linux-pci@vger.kernel.org 29 Contact: linux-pci@vger.kernel.org
37 Description: 30 Description:
38 Writing a device ID to this fi 31 Writing a device ID to this file will attempt to
39 dynamically add a new device I 32 dynamically add a new device ID to a PCI device driver.
40 This may allow the driver to s 33 This may allow the driver to support more hardware than
41 was included in the driver's s 34 was included in the driver's static device ID support
42 table at compile time. The fo 35 table at compile time. The format for the device ID is:
43 VVVV DDDD SVVV SDDD CCCC MMMM 36 VVVV DDDD SVVV SDDD CCCC MMMM PPPP. That is Vendor ID,
44 Device ID, Subsystem Vendor ID 37 Device ID, Subsystem Vendor ID, Subsystem Device ID,
45 Class, Class Mask, and Private 38 Class, Class Mask, and Private Driver Data. The Vendor ID
46 and Device ID fields are requi 39 and Device ID fields are required, the rest are optional.
47 Upon successfully adding an ID 40 Upon successfully adding an ID, the driver will probe
48 for the device and attempt to !! 41 for the device and attempt to bind to it. For example:
49 !! 42 # echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
50 # echo "8086 10f5" > /sys/bu <<
51 43
52 What: /sys/bus/pci/drivers/.../remov 44 What: /sys/bus/pci/drivers/.../remove_id
53 What: /sys/devices/pciX/.../remove_i <<
54 Date: February 2009 45 Date: February 2009
55 Contact: Chris Wright <chrisw@sous-sol.o 46 Contact: Chris Wright <chrisw@sous-sol.org>
56 Description: 47 Description:
57 Writing a device ID to this fi 48 Writing a device ID to this file will remove an ID
58 that was dynamically added via 49 that was dynamically added via the new_id sysfs entry.
59 The format for the device ID i 50 The format for the device ID is:
60 VVVV DDDD SVVV SDDD CCCC MMMM. 51 VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
61 ID, Subsystem Vendor ID, Subsy 52 ID, Subsystem Vendor ID, Subsystem Device ID, Class,
62 and Class Mask. The Vendor ID 53 and Class Mask. The Vendor ID and Device ID fields are
63 required, the rest are optiona 54 required, the rest are optional. After successfully
64 removing an ID, the driver wil 55 removing an ID, the driver will no longer support the
65 device. This is useful to ens 56 device. This is useful to ensure auto probing won't
66 match the driver to the device !! 57 match the driver to the device. For example:
67 !! 58 # echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
68 # echo "8086 10f5" > /sys/bu <<
69 59
70 What: /sys/bus/pci/rescan 60 What: /sys/bus/pci/rescan
71 Date: January 2009 61 Date: January 2009
72 Contact: Linux PCI developers <linux-pci 62 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
73 Description: 63 Description:
74 Writing a non-zero value to th 64 Writing a non-zero value to this attribute will
75 force a rescan of all PCI buse 65 force a rescan of all PCI buses in the system, and
76 re-discover previously removed 66 re-discover previously removed devices.
77 67
78 What: /sys/bus/pci/devices/.../msi_b 68 What: /sys/bus/pci/devices/.../msi_bus
79 Date: September 2014 69 Date: September 2014
80 Contact: Linux PCI developers <linux-pci 70 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
81 Description: 71 Description:
82 Writing a zero value to this a 72 Writing a zero value to this attribute disallows MSI and
83 MSI-X for any future drivers o 73 MSI-X for any future drivers of the device. If the device
84 is a bridge, MSI and MSI-X wil 74 is a bridge, MSI and MSI-X will be disallowed for future
85 drivers of all child devices u 75 drivers of all child devices under the bridge. Drivers
86 must be reloaded for the new s 76 must be reloaded for the new setting to take effect.
87 77
88 What: /sys/bus/pci/devices/.../msi_i 78 What: /sys/bus/pci/devices/.../msi_irqs/
89 Date: September, 2011 79 Date: September, 2011
90 Contact: Neil Horman <nhorman@tuxdriver. 80 Contact: Neil Horman <nhorman@tuxdriver.com>
91 Description: 81 Description:
92 The /sys/devices/.../msi_irqs 82 The /sys/devices/.../msi_irqs directory contains a variable set
93 of files, with each file being 83 of files, with each file being named after a corresponding msi
94 irq vector allocated to that d 84 irq vector allocated to that device.
95 85
96 What: /sys/bus/pci/devices/.../msi_i 86 What: /sys/bus/pci/devices/.../msi_irqs/<N>
97 Date: September 2011 87 Date: September 2011
98 Contact: Neil Horman <nhorman@tuxdriver. 88 Contact: Neil Horman <nhorman@tuxdriver.com>
99 Description: 89 Description:
100 This attribute indicates the m 90 This attribute indicates the mode that the irq vector named by
101 the file is in (msi vs. msix) 91 the file is in (msi vs. msix)
102 92
103 What: /sys/bus/pci/devices/.../irq <<
104 Date: August 2021 <<
105 Contact: Linux PCI developers <linux-pci <<
106 Description: <<
107 If a driver has enabled MSI (n <<
108 IRQ of the first MSI vector. O <<
109 IRQ of the legacy INTx interru <<
110 <<
111 "irq" being set to 0 indicates <<
112 capable of generating legacy I <<
113 <<
114 What: /sys/bus/pci/devices/.../remov 93 What: /sys/bus/pci/devices/.../remove
115 Date: January 2009 94 Date: January 2009
116 Contact: Linux PCI developers <linux-pci 95 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
117 Description: 96 Description:
118 Writing a non-zero value to th 97 Writing a non-zero value to this attribute will
119 hot-remove the PCI device and 98 hot-remove the PCI device and any of its children.
120 99
121 What: /sys/bus/pci/devices/.../pci_b 100 What: /sys/bus/pci/devices/.../pci_bus/.../rescan
122 Date: May 2011 101 Date: May 2011
123 Contact: Linux PCI developers <linux-pci 102 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
124 Description: 103 Description:
125 Writing a non-zero value to th 104 Writing a non-zero value to this attribute will
126 force a rescan of the bus and 105 force a rescan of the bus and all child buses,
127 and re-discover devices remove 106 and re-discover devices removed earlier from this
128 part of the device tree. 107 part of the device tree.
129 108
130 What: /sys/bus/pci/devices/.../resca 109 What: /sys/bus/pci/devices/.../rescan
131 Date: January 2009 110 Date: January 2009
132 Contact: Linux PCI developers <linux-pci 111 Contact: Linux PCI developers <linux-pci@vger.kernel.org>
133 Description: 112 Description:
134 Writing a non-zero value to th 113 Writing a non-zero value to this attribute will
135 force a rescan of the device's 114 force a rescan of the device's parent bus and all
136 child buses, and re-discover d 115 child buses, and re-discover devices removed earlier
137 from this part of the device t 116 from this part of the device tree.
138 117
139 What: /sys/bus/pci/devices/.../reset <<
140 Date: August 2021 <<
141 Contact: Amey Narkhede <ameynarkhede03@g <<
142 Description: <<
143 Some devices allow an individu <<
144 without affecting other functi <<
145 <<
146 For devices that have this sup <<
147 reset_method is present in sys <<
148 gives names of the supported a <<
149 their ordering. Writing a spa <<
150 reset methods sets the reset m <<
151 used when resetting the device <<
152 disables the ability to reset <<
153 "default" enables all supporte <<
154 default ordering. <<
155 <<
156 What: /sys/bus/pci/devices/.../reset 118 What: /sys/bus/pci/devices/.../reset
157 Date: July 2009 119 Date: July 2009
158 Contact: Michael S. Tsirkin <mst@redhat. 120 Contact: Michael S. Tsirkin <mst@redhat.com>
159 Description: 121 Description:
160 Some devices allow an individu 122 Some devices allow an individual function to be reset
161 without affecting other functi 123 without affecting other functions in the same device.
162 For devices that have this sup 124 For devices that have this support, a file named reset
163 will be present in sysfs. Wri 125 will be present in sysfs. Writing 1 to this file
164 will perform reset. 126 will perform reset.
165 127
166 What: /sys/bus/pci/devices/.../vpd 128 What: /sys/bus/pci/devices/.../vpd
167 Date: February 2008 129 Date: February 2008
168 Contact: Ben Hutchings <bwh@kernel.org> 130 Contact: Ben Hutchings <bwh@kernel.org>
169 Description: 131 Description:
170 A file named vpd in a device d 132 A file named vpd in a device directory will be a
171 binary file containing the Vit 133 binary file containing the Vital Product Data for the
172 device. It should follow the 134 device. It should follow the VPD format defined in
173 PCI Specification 2.1 or 2.2, 135 PCI Specification 2.1 or 2.2, but users should consider
174 that some devices may have inc !! 136 that some devices may have malformatted data. If the
175 If the underlying VPD has a wr !! 137 underlying VPD has a writable section then the
176 corresponding section of this 138 corresponding section of this file will be writable.
177 139
178 What: /sys/bus/pci/devices/.../virtf !! 140 What: /sys/bus/pci/devices/.../virtfnN
179 Date: March 2009 141 Date: March 2009
180 Contact: Yu Zhao <yu.zhao@intel.com> 142 Contact: Yu Zhao <yu.zhao@intel.com>
181 Description: 143 Description:
182 This symbolic link appears whe 144 This symbolic link appears when hardware supports the SR-IOV
183 capability and the Physical Fu 145 capability and the Physical Function driver has enabled it.
184 The symbolic link points to th 146 The symbolic link points to the PCI device sysfs entry of the
185 Virtual Function whose index i 147 Virtual Function whose index is N (0...MaxVFs-1).
186 148
187 What: /sys/bus/pci/devices/.../dep_l 149 What: /sys/bus/pci/devices/.../dep_link
188 Date: March 2009 150 Date: March 2009
189 Contact: Yu Zhao <yu.zhao@intel.com> 151 Contact: Yu Zhao <yu.zhao@intel.com>
190 Description: 152 Description:
191 This symbolic link appears whe 153 This symbolic link appears when hardware supports the SR-IOV
192 capability and the Physical Fu 154 capability and the Physical Function driver has enabled it,
193 and this device has vendor spe 155 and this device has vendor specific dependencies with others.
194 The symbolic link points to th 156 The symbolic link points to the PCI device sysfs entry of
195 Physical Function this device 157 Physical Function this device depends on.
196 158
197 What: /sys/bus/pci/devices/.../physf 159 What: /sys/bus/pci/devices/.../physfn
198 Date: March 2009 160 Date: March 2009
199 Contact: Yu Zhao <yu.zhao@intel.com> 161 Contact: Yu Zhao <yu.zhao@intel.com>
200 Description: 162 Description:
201 This symbolic link appears whe 163 This symbolic link appears when a device is a Virtual Function.
202 The symbolic link points to th 164 The symbolic link points to the PCI device sysfs entry of the
203 Physical Function this device 165 Physical Function this device associates with.
204 166
205 What: /sys/bus/pci/devices/.../modal <<
206 Date: May 2005 <<
207 Contact: Greg Kroah-Hartman <gregkh@linu <<
208 Description: <<
209 This attribute indicates the P <<
210 <<
211 That is in the format: <<
212 pci:vXXXXXXXXdXXXXXXXXsvXXXXXX <<
213 where: <<
214 <<
215 - vXXXXXXXX contains the v <<
216 - dXXXXXXXX contains the d <<
217 - svXXXXXXXX contains the <<
218 - sdXXXXXXXX contains the <<
219 - bcXX contains the device <<
220 - scXX contains the device <<
221 - iXX contains the device <<
222 <<
223 What: /sys/bus/pci/slots/.../module 167 What: /sys/bus/pci/slots/.../module
224 Date: June 2009 168 Date: June 2009
225 Contact: linux-pci@vger.kernel.org 169 Contact: linux-pci@vger.kernel.org
226 Description: 170 Description:
227 This symbolic link points to t 171 This symbolic link points to the PCI hotplug controller driver
228 module that manages the hotplu 172 module that manages the hotplug slot.
229 173
230 What: /sys/bus/pci/devices/.../label 174 What: /sys/bus/pci/devices/.../label
231 Date: July 2010 175 Date: July 2010
232 Contact: Narendra K <narendra_k@dell.com 176 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
233 Description: 177 Description:
234 Reading this attribute will pr 178 Reading this attribute will provide the firmware
235 given name (SMBIOS type 41 str 179 given name (SMBIOS type 41 string or ACPI _DSM string) of
236 the PCI device. The attribute 180 the PCI device. The attribute will be created only
237 if the firmware has given a na 181 if the firmware has given a name to the PCI device.
238 ACPI _DSM string name will be 182 ACPI _DSM string name will be given priority if the
239 system firmware provides SMBIO 183 system firmware provides SMBIOS type 41 string also.
240 Users: 184 Users:
241 Userspace applications interes 185 Userspace applications interested in knowing the
242 firmware assigned name of the 186 firmware assigned name of the PCI device.
243 187
244 What: /sys/bus/pci/devices/.../index 188 What: /sys/bus/pci/devices/.../index
245 Date: July 2010 189 Date: July 2010
246 Contact: Narendra K <narendra_k@dell.com 190 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
247 Description: 191 Description:
248 Reading this attribute will pr !! 192 Reading this attribute will provide the firmware
249 number of the PCI device. Dep !! 193 given instance (SMBIOS type 41 device type instance) of the
250 be for example the SMBIOS type !! 194 PCI device. The attribute will be created only if the firmware
251 user-defined ID (UID) on s390. !! 195 has given an instance number to the PCI device.
252 only if the firmware has given <<
253 device and that number is guar <<
254 device in the system. <<
255 Users: 196 Users:
256 Userspace applications interes 197 Userspace applications interested in knowing the
257 firmware assigned device type 198 firmware assigned device type instance of the PCI
258 device that can help in unders 199 device that can help in understanding the firmware
259 intended order of the PCI devi 200 intended order of the PCI device.
260 201
261 What: /sys/bus/pci/devices/.../acpi_ 202 What: /sys/bus/pci/devices/.../acpi_index
262 Date: July 2010 203 Date: July 2010
263 Contact: Narendra K <narendra_k@dell.com 204 Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
264 Description: 205 Description:
265 Reading this attribute will pr 206 Reading this attribute will provide the firmware
266 given instance (ACPI _DSM inst 207 given instance (ACPI _DSM instance number) of the PCI device.
267 The attribute will be created 208 The attribute will be created only if the firmware has given
268 an instance number to the PCI 209 an instance number to the PCI device. ACPI _DSM instance number
269 will be given priority if the 210 will be given priority if the system firmware provides SMBIOS
270 type 41 device type instance a 211 type 41 device type instance also.
271 Users: 212 Users:
272 Userspace applications interes 213 Userspace applications interested in knowing the
273 firmware assigned instance num 214 firmware assigned instance number of the PCI
274 device that can help in unders 215 device that can help in understanding the firmware
275 intended order of the PCI devi 216 intended order of the PCI device.
276 217
277 What: /sys/bus/pci/devices/.../d3col 218 What: /sys/bus/pci/devices/.../d3cold_allowed
278 Date: July 2012 219 Date: July 2012
279 Contact: Huang Ying <ying.huang@intel.co 220 Contact: Huang Ying <ying.huang@intel.com>
280 Description: 221 Description:
281 d3cold_allowed is bit to contr 222 d3cold_allowed is bit to control whether the corresponding PCI
282 device can be put into D3Cold 223 device can be put into D3Cold state. If it is cleared, the
283 device will never be put into 224 device will never be put into D3Cold state. If it is set, the
284 device may be put into D3Cold 225 device may be put into D3Cold state if other requirements are
285 satisfied too. Reading this a 226 satisfied too. Reading this attribute will show the current
286 value of d3cold_allowed bit. 227 value of d3cold_allowed bit. Writing this attribute will set
287 the value of d3cold_allowed bi 228 the value of d3cold_allowed bit.
288 229
289 What: /sys/bus/pci/devices/.../sriov 230 What: /sys/bus/pci/devices/.../sriov_totalvfs
290 Date: November 2012 231 Date: November 2012
291 Contact: Donald Dutile <ddutile@redhat.c 232 Contact: Donald Dutile <ddutile@redhat.com>
292 Description: 233 Description:
293 This file appears when a physi 234 This file appears when a physical PCIe device supports SR-IOV.
294 Userspace applications can rea 235 Userspace applications can read this file to determine the
295 maximum number of Virtual Func 236 maximum number of Virtual Functions (VFs) a PCIe physical
296 function (PF) can support. Typ 237 function (PF) can support. Typically, this is the value reported
297 in the PF's SR-IOV extended ca 238 in the PF's SR-IOV extended capability structure's TotalVFs
298 element. Drivers have the abi 239 element. Drivers have the ability at probe time to reduce the
299 value read from this file via 240 value read from this file via the pci_sriov_set_totalvfs()
300 function. 241 function.
301 242
302 What: /sys/bus/pci/devices/.../sriov 243 What: /sys/bus/pci/devices/.../sriov_numvfs
303 Date: November 2012 244 Date: November 2012
304 Contact: Donald Dutile <ddutile@redhat.c 245 Contact: Donald Dutile <ddutile@redhat.com>
305 Description: 246 Description:
306 This file appears when a physi 247 This file appears when a physical PCIe device supports SR-IOV.
307 Userspace applications can rea 248 Userspace applications can read and write to this file to
308 determine and control the enab 249 determine and control the enablement or disablement of Virtual
309 Functions (VFs) on the physica 250 Functions (VFs) on the physical function (PF). A read of this
310 file will return the number of 251 file will return the number of VFs that are enabled on this PF.
311 A number written to this file 252 A number written to this file will enable the specified
312 number of VFs. A userspace app 253 number of VFs. A userspace application would typically read the
313 file and check that the value 254 file and check that the value is zero, and then write the number
314 of VFs that should be enabled 255 of VFs that should be enabled on the PF; the value written
315 should be less than or equal t 256 should be less than or equal to the value in the sriov_totalvfs
316 file. A userspace application 257 file. A userspace application wanting to disable the VFs would
317 write a zero to this file. The 258 write a zero to this file. The core ensures that valid values
318 are written to this file, and 259 are written to this file, and returns errors when values are not
319 valid. For example, writing a 260 valid. For example, writing a 2 to this file when sriov_numvfs
320 is not 0 and not 2 already wil 261 is not 0 and not 2 already will return an error. Writing a 10
321 when the value of sriov_totalv 262 when the value of sriov_totalvfs is 8 will return an error.
322 263
323 What: /sys/bus/pci/devices/.../drive 264 What: /sys/bus/pci/devices/.../driver_override
324 Date: April 2014 265 Date: April 2014
325 Contact: Alex Williamson <alex.williamso 266 Contact: Alex Williamson <alex.williamson@redhat.com>
326 Description: 267 Description:
327 This file allows the driver fo 268 This file allows the driver for a device to be specified which
328 will override standard static 269 will override standard static and dynamic ID matching. When
329 specified, only a driver with 270 specified, only a driver with a name matching the value written
330 to driver_override will have a 271 to driver_override will have an opportunity to bind to the
331 device. The override is speci 272 device. The override is specified by writing a string to the
332 driver_override file (echo pci 273 driver_override file (echo pci-stub > driver_override) and
333 may be cleared with an empty s 274 may be cleared with an empty string (echo > driver_override).
334 This returns the device to sta 275 This returns the device to standard matching rules binding.
335 Writing to driver_override doe 276 Writing to driver_override does not automatically unbind the
336 device from its current driver 277 device from its current driver or make any attempt to
337 automatically load the specifi 278 automatically load the specified driver. If no driver with a
338 matching name is currently loa 279 matching name is currently loaded in the kernel, the device
339 will not bind to any driver. 280 will not bind to any driver. This also allows devices to
340 opt-out of driver binding usin 281 opt-out of driver binding using a driver_override name such as
341 "none". Only a single driver 282 "none". Only a single driver may be specified in the override,
342 there is no support for parsin 283 there is no support for parsing delimiters.
343 284
344 What: /sys/bus/pci/devices/.../numa_ 285 What: /sys/bus/pci/devices/.../numa_node
345 Date: Oct 2014 286 Date: Oct 2014
346 Contact: Prarit Bhargava <prarit@redhat. 287 Contact: Prarit Bhargava <prarit@redhat.com>
347 Description: 288 Description:
348 This file contains the NUMA no 289 This file contains the NUMA node to which the PCI device is
349 attached, or -1 if the node is 290 attached, or -1 if the node is unknown. The initial value
350 comes from an ACPI _PXM method 291 comes from an ACPI _PXM method or a similar firmware
351 source. If that is missing or 292 source. If that is missing or incorrect, this file can be
352 written to override the node. 293 written to override the node. In that case, please report
353 a firmware bug to the system v 294 a firmware bug to the system vendor. Writing to this file
354 taints the kernel with TAINT_F 295 taints the kernel with TAINT_FIRMWARE_WORKAROUND, which
355 reduces the supportability of 296 reduces the supportability of your system.
356 297
357 What: /sys/bus/pci/devices/.../revis 298 What: /sys/bus/pci/devices/.../revision
358 Date: November 2016 299 Date: November 2016
359 Contact: Emil Velikov <emil.l.velikov@gm 300 Contact: Emil Velikov <emil.l.velikov@gmail.com>
360 Description: 301 Description:
361 This file contains the revisio !! 302 This file contains the revision field of the the PCI device.
362 The value comes from device co 303 The value comes from device config space. The file is read only.
363 <<
364 What: /sys/bus/pci/devices/.../sriov <<
365 Date: April 2017 <<
366 Contact: Bodong Wang<bodong@mellanox.com <<
367 Description: <<
368 This file is associated with t <<
369 supports SR-IOV. It determine <<
370 are immediately bound to a dri <<
371 1, which means the kernel auto <<
372 compatible driver immediately <<
373 an application writes 0 to the <<
374 the kernel will not bind VFs t <<
375 <<
376 A typical use case is to write <<
377 VFs, then assign the newly-cre <<
378 Note that changing this file d <<
379 enabled VFs. In this scenario <<
380 the VFs, write 0 to sriov_driv <<
381 the VFs. <<
382 <<
383 This is similar to /sys/bus/pc <<
384 affects only the VFs associate <<
385 <<
386 What: /sys/bus/pci/devices/.../p2pme <<
387 Date: November 2017 <<
388 Contact: Logan Gunthorpe <logang@deltate <<
389 Description: <<
390 If the device has any Peer-to- <<
391 file contains the total amount <<
392 provides (in decimal). <<
393 <<
394 What: /sys/bus/pci/devices/.../p2pme <<
395 Date: November 2017 <<
396 Contact: Logan Gunthorpe <logang@deltate <<
397 Description: <<
398 If the device has any Peer-to- <<
399 file contains the amount of me <<
400 allocated (in decimal). <<
401 <<
402 What: /sys/bus/pci/devices/.../p2pme <<
403 Date: November 2017 <<
404 Contact: Logan Gunthorpe <logang@deltate <<
405 Description: <<
406 If the device has any Peer-to- <<
407 file contains a '1' if the mem <<
408 use outside the driver that ow <<
409 <<
410 What: /sys/bus/pci/devices/.../p2pme <<
411 Date: August 2022 <<
412 Contact: Logan Gunthorpe <logang@deltate <<
413 Description: <<
414 This file allows mapping p2pme <<
415 mmap() call on this file, the <<
416 of Peer-to-Peer memory for use <<
417 This memory can be used in O_D <<
418 files for Peer-to-Peer copies. <<
419 <<
420 What: /sys/bus/pci/devices/.../link/ <<
421 /sys/bus/pci/devices/.../link/ <<
422 /sys/bus/pci/devices/.../link/ <<
423 /sys/bus/pci/devices/.../link/ <<
424 /sys/bus/pci/devices/.../link/ <<
425 /sys/bus/pci/devices/.../link/ <<
426 /sys/bus/pci/devices/.../link/ <<
427 Date: October 2019 <<
428 Contact: Heiner Kallweit <hkallweit1@gma <<
429 Description: If ASPM is supported for an en <<
430 used to disable or enable the <<
431 states. Write y/1/on to enable <<
432 <<
433 What: /sys/bus/pci/devices/.../power <<
434 Date: November 2020 <<
435 Contact: Linux PCI developers <linux-pci <<
436 Description: <<
437 This file contains the current <<
438 The value comes from the PCI k <<
439 of: "unknown", "error", "D0", <<
440 The file is read only. <<
441 <<
442 What: /sys/bus/pci/devices/.../sriov <<
443 Date: January 2021 <<
444 Contact: Leon Romanovsky <leonro@nvidia. <<
445 Description: <<
446 This file is associated with a <<
447 It contains the total number o <<
448 assignment to all virtual func <<
449 The value will be zero if the <<
450 functionality. For supported d <<
451 constant and won't be changed <<
452 <<
453 What: /sys/bus/pci/devices/.../sriov <<
454 Date: January 2021 <<
455 Contact: Leon Romanovsky <leonro@nvidia. <<
456 Description: <<
457 This file is associated with a <<
458 It allows configuration of the <<
459 the VF. This allows devices th <<
460 vectors to optimally divide th <<
461 <<
462 The values accepted are: <<
463 * > 0 - this number will be r <<
464 VF's MSI-X capability <<
465 * < 0 - not valid <<
466 * = 0 - will reset to the dev <<
467 <<
468 The file is writable if the PF <<
469 implements ->sriov_set_msix_ve <<
470 <<
471 What: /sys/bus/pci/devices/.../resou <<
472 Date: September 2022 <<
473 Contact: Alex Williamson <alex.williamso <<
474 Description: <<
475 These files provide an interfa <<
476 A file is created for each BAR <<
477 PCIe Resizable BAR extended ca <<
478 each file exposes the bitmap o <<
479 <<
480 # cat resource1_resize <<
481 00000000000001c0 <<
482 <<
483 The bitmap represents supporte <<
484 where bit0 = 1MB, bit1 = 2MB, <<
485 example the device supports 64 <<
486 <<
487 When writing the file, the use <<
488 the desired resource size, for <<
489 <<
490 # echo 7 > resource1_resize <<
491 <<
492 This indicates to set the size <<
493 128MB. The resulting size is <<
494 matches the PCIe specification <<
495 <<
496 In order to make use of resour <<
497 be unbound from the device and <<
498 parent bridge may need to be s <<
499 VGA devices, writing a resize <<
500 console drivers from the devic <<
501 resourceN attributes must be t <<
502 Success of the resizing operat <<
503 <<
504 What: /sys/bus/pci/devices/.../leds/ <<
505 What: /sys/class/leds/*:enclosure:*/ <<
506 Date: August 2024 <<
507 KernelVersion: 6.12 <<
508 Description: <<
509 LED indications on PCIe storag <<
510 through the NPEM interface (Na <<
511 PCIe r6.1 sec 6.28) are access <<
512 below /sys/class/leds and belo <<
513 <<
514 Although these led class devic <<
515 in practice they are typically <<
516 application such as ledmon(8). <<
517 <<
518 The name of a led class device <<
519 <bdf>:enclosure:<indication> <<
520 where: <<
521 <<
522 - <bdf> is the domain, bus, de <<
523 (e.g. 10000:02:05.0) <<
524 - <indication> is a short desc <<
525 <<
526 Valid indications per PCIe r6. <<
527 <<
528 - ok (drive is functioning nor <<
529 - locate (drive is being ident <<
530 - fail (drive is not functioni <<
531 - rebuild (drive is part of an <<
532 - pfa (drive is predicted to f <<
533 - hotspare (drive is marked to <<
534 - ica (drive is part of an arr <<
535 - ifa (drive is part of an arr <<
536 - idt (drive is not the right <<
537 - disabled (drive is disabled, <<
538 - specific0 to specific7 (encl <<
539 <<
540 Broadly, the indications fall <<
541 <<
542 - to signify drive state (ok, <<
543 - to signify drive role or sta <<
544 (rebuild, pfa, hotspare, ica <<
545 - to signify any other role or <<
546 <<
547 Mandatory indications per PCIe <<
548 ok, locate, fail, rebuild. All <<
549 A led class device is only vis <<
550 indication is supported by the <<
551 <<
552 To manipulate the indications, <<
553 to the "brightness" file. Note <<
554 may implicitly manipulate othe <<
555 discretion. E.g. when the user <<
556 the vendor may choose to autom <<
557 indication. The current state <<
558 retrieved by reading its "brig <<
559 <<
560 The PCIe Base Specification al <<
561 different colors or blinking p <<
562 but they typically follow the <<
563 indication is usually presente <<
564 4 Hz frequency: <<
565 https://en.wikipedia.org/wiki/ <<
566 <<
567 PCI Firmware Specification r3. <<
568 to facilitate shared access by <<
569 firmware to a device's NPEM re <<
570 this DSM interface where avail <<
571 registers directly. The DSM in <<
572 enclosure-specific indications <<
573 hence the corresponding led cl <<
574 the DSM interface is used. <<
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