1What: /sys/bus/dsa/devices/dsa<m>/version 2Date: Apr 15, 2020 3KernelVersion: 5.8.0 4Contact: dmaengine@vger.kernel.org 5Description: The hardware version number. 6 7What: /sys/bus/dsa/devices/dsa<m>/cdev_major 8Date: Oct 25, 2019 9KernelVersion: 5.6.0 10Contact: dmaengine@vger.kernel.org 11Description: The major number that the character device driver assigned to 12 this device. 13 14What: /sys/bus/dsa/devices/dsa<m>/errors 15Date: Oct 25, 2019 16KernelVersion: 5.6.0 17Contact: dmaengine@vger.kernel.org 18Description: The error information for this device. 19 20What: /sys/bus/dsa/devices/dsa<m>/max_batch_size 21Date: Oct 25, 2019 22KernelVersion: 5.6.0 23Contact: dmaengine@vger.kernel.org 24Description: The largest number of work descriptors in a batch. 25 It's not visible when the device does not support batch. 26 27What: /sys/bus/dsa/devices/dsa<m>/max_work_queues_size 28Date: Oct 25, 2019 29KernelVersion: 5.6.0 30Contact: dmaengine@vger.kernel.org 31Description: The maximum work queue size supported by this device. 32 33What: /sys/bus/dsa/devices/dsa<m>/max_engines 34Date: Oct 25, 2019 35KernelVersion: 5.6.0 36Contact: dmaengine@vger.kernel.org 37Description: The maximum number of engines supported by this device. 38 39What: /sys/bus/dsa/devices/dsa<m>/max_groups 40Date: Oct 25, 2019 41KernelVersion: 5.6.0 42Contact: dmaengine@vger.kernel.org 43Description: The maximum number of groups can be created under this device. 44 45What: /sys/bus/dsa/devices/dsa<m>/max_read_buffers 46Date: Dec 10, 2021 47KernelVersion: 5.17.0 48Contact: dmaengine@vger.kernel.org 49Description: The total number of read buffers supported by this device. 50 The read buffers represent resources within the DSA 51 implementation, and these resources are allocated by engines to 52 support operations. See DSA spec v1.2 9.2.4 Total Read Buffers. 53 It's not visible when the device does not support Read Buffer 54 allocation control. 55 56What: /sys/bus/dsa/devices/dsa<m>/max_transfer_size 57Date: Oct 25, 2019 58KernelVersion: 5.6.0 59Contact: dmaengine@vger.kernel.org 60Description: The number of bytes to be read from the source address to 61 perform the operation. The maximum transfer size is dependent on 62 the workqueue the descriptor was submitted to. 63 64What: /sys/bus/dsa/devices/dsa<m>/max_work_queues 65Date: Oct 25, 2019 66KernelVersion: 5.6.0 67Contact: dmaengine@vger.kernel.org 68Description: The maximum work queue number that this device supports. 69 70What: /sys/bus/dsa/devices/dsa<m>/numa_node 71Date: Oct 25, 2019 72KernelVersion: 5.6.0 73Contact: dmaengine@vger.kernel.org 74Description: The numa node number for this device. 75 76What: /sys/bus/dsa/devices/dsa<m>/op_cap 77Date: Oct 25, 2019 78KernelVersion: 5.6.0 79Contact: dmaengine@vger.kernel.org 80Description: The operation capability bit mask specify the operation types 81 supported by the this device. 82 83What: /sys/bus/dsa/devices/dsa<m>/pasid_enabled 84Date: Oct 27, 2020 85KernelVersion: 5.11.0 86Contact: dmaengine@vger.kernel.org 87Description: To indicate if PASID (process address space identifier) is 88 enabled or not for this device. 89 90What: /sys/bus/dsa/devices/dsa<m>/state 91Date: Oct 25, 2019 92KernelVersion: 5.6.0 93Contact: dmaengine@vger.kernel.org 94Description: The state information of this device. It can be either enabled 95 or disabled. 96 97What: /sys/bus/dsa/devices/dsa<m>/group<m>.<n> 98Date: Oct 25, 2019 99KernelVersion: 5.6.0 100Contact: dmaengine@vger.kernel.org 101Description: The assigned group under this device. 102 103What: /sys/bus/dsa/devices/dsa<m>/engine<m>.<n> 104Date: Oct 25, 2019 105KernelVersion: 5.6.0 106Contact: dmaengine@vger.kernel.org 107Description: The assigned engine under this device. 108 109What: /sys/bus/dsa/devices/dsa<m>/wq<m>.<n> 110Date: Oct 25, 2019 111KernelVersion: 5.6.0 112Contact: dmaengine@vger.kernel.org 113Description: The assigned work queue under this device. 114 115What: /sys/bus/dsa/devices/dsa<m>/configurable 116Date: Oct 25, 2019 117KernelVersion: 5.6.0 118Contact: dmaengine@vger.kernel.org 119Description: To indicate if this device is configurable or not. 120 121What: /sys/bus/dsa/devices/dsa<m>/read_buffer_limit 122Date: Dec 10, 2021 123KernelVersion: 5.17.0 124Contact: dmaengine@vger.kernel.org 125Description: The maximum number of read buffers that may be in use at 126 one time by operations that access low bandwidth memory in the 127 device. See DSA spec v1.2 9.2.8 GENCFG on Global Read Buffer Limit. 128 It's not visible when the device does not support Read Buffer 129 allocation control. 130 131What: /sys/bus/dsa/devices/dsa<m>/cmd_status 132Date: Aug 28, 2020 133KernelVersion: 5.10.0 134Contact: dmaengine@vger.kernel.org 135Description: The last executed device administrative command's status/error. 136 Also last configuration error overloaded. 137 Writing to it will clear the status. 138 139What: /sys/bus/dsa/devices/dsa<m>/iaa_cap 140Date: Sept 14, 2022 141KernelVersion: 6.0.0 142Contact: dmaengine@vger.kernel.org 143Description: IAA (IAX) capability mask. Exported to user space for application 144 consumption. This attribute should only be visible on IAA devices 145 that are version 2 or later. 146 147What: /sys/bus/dsa/devices/dsa<m>/event_log_size 148Date: Sept 14, 2022 149KernelVersion: 6.4.0 150Contact: dmaengine@vger.kernel.org 151Description: The event log size to be configured. Default is 64 entries and 152 occupies 4k size if the evl entry is 64 bytes. It's visible 153 only on platforms that support the capability. 154 155What: /sys/bus/dsa/devices/wq<m>.<n>/block_on_fault 156Date: Oct 27, 2020 157KernelVersion: 5.11.0 158Contact: dmaengine@vger.kernel.org 159Description: To indicate block on fault is allowed or not for the work queue 160 to support on demand paging. 161 162What: /sys/bus/dsa/devices/wq<m>.<n>/group_id 163Date: Oct 25, 2019 164KernelVersion: 5.6.0 165Contact: dmaengine@vger.kernel.org 166Description: The group id that this work queue belongs to. 167 168What: /sys/bus/dsa/devices/wq<m>.<n>/size 169Date: Oct 25, 2019 170KernelVersion: 5.6.0 171Contact: dmaengine@vger.kernel.org 172Description: The work queue size for this work queue. 173 174What: /sys/bus/dsa/devices/wq<m>.<n>/type 175Date: Oct 25, 2019 176KernelVersion: 5.6.0 177Contact: dmaengine@vger.kernel.org 178Description: The type of this work queue, it can be "kernel" type for work 179 queue usages in the kernel space or "user" type for work queue 180 usages by applications in user space. 181 182What: /sys/bus/dsa/devices/wq<m>.<n>/cdev_minor 183Date: Oct 25, 2019 184KernelVersion: 5.6.0 185Contact: dmaengine@vger.kernel.org 186Description: The minor number assigned to this work queue by the character 187 device driver. 188 189What: /sys/bus/dsa/devices/wq<m>.<n>/mode 190Date: Oct 25, 2019 191KernelVersion: 5.6.0 192Contact: dmaengine@vger.kernel.org 193Description: The work queue mode type for this work queue. 194 195What: /sys/bus/dsa/devices/wq<m>.<n>/priority 196Date: Oct 25, 2019 197KernelVersion: 5.6.0 198Contact: dmaengine@vger.kernel.org 199Description: The priority value of this work queue, it is a value relative to 200 other work queue in the same group to control quality of service 201 for dispatching work from multiple workqueues in the same group. 202 203What: /sys/bus/dsa/devices/wq<m>.<n>/state 204Date: Oct 25, 2019 205KernelVersion: 5.6.0 206Contact: dmaengine@vger.kernel.org 207Description: The current state of the work queue. 208 209What: /sys/bus/dsa/devices/wq<m>.<n>/threshold 210Date: Oct 25, 2019 211KernelVersion: 5.6.0 212Contact: dmaengine@vger.kernel.org 213Description: The number of entries in this work queue that may be filled 214 via a limited portal. 215 216What: /sys/bus/dsa/devices/wq<m>.<n>/max_transfer_size 217Date: Aug 28, 2020 218KernelVersion: 5.10.0 219Contact: dmaengine@vger.kernel.org 220Description: The max transfer sized for this workqueue. Cannot exceed device 221 max transfer size. Configurable parameter. 222 223What: /sys/bus/dsa/devices/wq<m>.<n>/max_batch_size 224Date: Aug 28, 2020 225KernelVersion: 5.10.0 226Contact: dmaengine@vger.kernel.org 227Description: The max batch size for this workqueue. Cannot exceed device 228 max batch size. Configurable parameter. 229 It's not visible when the device does not support batch. 230 231What: /sys/bus/dsa/devices/wq<m>.<n>/ats_disable 232Date: Nov 13, 2020 233KernelVersion: 5.11.0 234Contact: dmaengine@vger.kernel.org 235Description: Indicate whether ATS disable is turned on for the workqueue. 236 0 indicates ATS is on, and 1 indicates ATS is off for the workqueue. 237 238What: /sys/bus/dsa/devices/wq<m>.<n>/prs_disable 239Date: Sept 14, 2022 240KernelVersion: 6.4.0 241Contact: dmaengine@vger.kernel.org 242Description: Controls whether PRS disable is turned on for the workqueue. 243 0 indicates PRS is on, and 1 indicates PRS is off for the 244 workqueue. This option overrides block_on_fault attribute 245 if set. It's visible only on platforms that support the 246 capability. 247 248What: /sys/bus/dsa/devices/wq<m>.<n>/occupancy 249Date May 25, 2021 250KernelVersion: 5.14.0 251Contact: dmaengine@vger.kernel.org 252Description: Show the current number of entries in this WQ if WQ Occupancy 253 Support bit WQ capabilities is 1. 254 255What: /sys/bus/dsa/devices/wq<m>.<n>/enqcmds_retries 256Date Oct 29, 2021 257KernelVersion: 5.17.0 258Contact: dmaengine@vger.kernel.org 259Description: Indicate the number of retires for an enqcmds submission on a sharedwq. 260 A max value to set attribute is capped at 64. 261 262What: /sys/bus/dsa/devices/wq<m>.<n>/op_config 263Date: Sept 14, 2022 264KernelVersion: 6.0.0 265Contact: dmaengine@vger.kernel.org 266Description: Shows the operation capability bits displayed in bitmap format 267 presented by %*pb printk() output format specifier. 268 The attribute can be configured when the WQ is disabled in 269 order to configure the WQ to accept specific bits that 270 correlates to the operations allowed. It's visible only 271 on platforms that support the capability. 272 273What: /sys/bus/dsa/devices/engine<m>.<n>/group_id 274Date: Oct 25, 2019 275KernelVersion: 5.6.0 276Contact: dmaengine@vger.kernel.org 277Description: The group that this engine belongs to. 278 279What: /sys/bus/dsa/devices/group<m>.<n>/use_read_buffer_limit 280Date: Dec 10, 2021 281KernelVersion: 5.17.0 282Contact: dmaengine@vger.kernel.org 283Description: Enable the use of global read buffer limit for the group. See DSA 284 spec v1.2 9.2.18 GRPCFG Use Global Read Buffer Limit. 285 It's not visible when the device does not support Read Buffer 286 allocation control. 287 288What: /sys/bus/dsa/devices/group<m>.<n>/read_buffers_allowed 289Date: Dec 10, 2021 290KernelVersion: 5.17.0 291Contact: dmaengine@vger.kernel.org 292Description: Indicates max number of read buffers that may be in use at one time 293 by all engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read 294 Buffers Allowed. 295 It's not visible when the device does not support Read Buffer 296 allocation control. 297 298What: /sys/bus/dsa/devices/group<m>.<n>/read_buffers_reserved 299Date: Dec 10, 2021 300KernelVersion: 5.17.0 301Contact: dmaengine@vger.kernel.org 302Description: Indicates the number of Read Buffers reserved for the use of 303 engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read Buffers 304 Reserved. 305 It's not visible when the device does not support Read Buffer 306 allocation control. 307 308What: /sys/bus/dsa/devices/group<m>.<n>/desc_progress_limit 309Date: Sept 14, 2022 310KernelVersion: 6.0.0 311Contact: dmaengine@vger.kernel.org 312Description: Allows control of the number of work descriptors that can be 313 concurrently processed by an engine in the group as a fraction 314 of the Maximum Work Descriptors in Progress value specified in 315 the ENGCAP register. The acceptable values are 0 (default), 316 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of 317 the max value). It's visible only on platforms that support 318 the capability. 319 320What: /sys/bus/dsa/devices/group<m>.<n>/batch_progress_limit 321Date: Sept 14, 2022 322KernelVersion: 6.0.0 323Contact: dmaengine@vger.kernel.org 324Description: Allows control of the number of batch descriptors that can be 325 concurrently processed by an engine in the group as a fraction 326 of the Maximum Batch Descriptors in Progress value specified in 327 the ENGCAP register. The acceptable values are 0 (default), 328 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of 329 the max value). It's visible only on platforms that support 330 the capability. 331 332What: /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_faults 333Date: Sept 14, 2022 334KernelVersion: 6.4.0 335Contact: dmaengine@vger.kernel.org 336Description: Show the number of Completion Record (CR) faults this application 337 has caused. 338 339What: /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_fault_failures 340Date: Sept 14, 2022 341KernelVersion: 6.4.0 342Contact: dmaengine@vger.kernel.org 343Description: Show the number of Completion Record (CR) faults failures that this 344 application has caused. The failure counter is incremented when the 345 driver cannot fault in the address for the CR. Typically this is caused 346 by a bad address programmed in the submitted descriptor or a malicious 347 submitter is using bad CR address on purpose. 348 349What: /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/pid 350Date: Sept 14, 2022 351KernelVersion: 6.4.0 352Contact: dmaengine@vger.kernel.org 353Description: Show the process id of the application that opened the file. This is 354 helpful information for a monitor daemon that wants to kill the 355 application that opened the file. 356