What: /sys/bus/platform/devices/dfl-port.0/id
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Date: June 2018
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KernelVersion: 4.19
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. It returns id of this port. One DFL FPGA device
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may have more than one port. Userspace could use this id to
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distinguish different ports under same FPGA device.
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What: /sys/bus/platform/devices/dfl-port.0/afu_id
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Date: June 2018
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KernelVersion: 4.19
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. User can program different PR bitstreams to FPGA
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Accelerator Function Unit (AFU) for different functions. It
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returns uuid which could be used to identify which PR bitstream
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is programmed in this AFU.
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What: /sys/bus/platform/devices/dfl-port.0/power_state
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. It reports the APx (AFU Power) state, different APx
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means different throttling level. When reading this file, it
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returns "0" - Normal / "1" - AP1 / "2" - AP2 / "6" - AP6.
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What: /sys/bus/platform/devices/dfl-port.0/ap1_event
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-write. Read this file for AP1 (AFU Power State 1) event.
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It's used to indicate transient AP1 state. Write 1 to this
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file to clear AP1 event.
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What: /sys/bus/platform/devices/dfl-port.0/ap2_event
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-write. Read this file for AP2 (AFU Power State 2) event.
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It's used to indicate transient AP2 state. Write 1 to this
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file to clear AP2 event.
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What: /sys/bus/platform/devices/dfl-port.0/ltr
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-write. Read or set AFU latency tolerance reporting value.
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Set ltr to 1 if the AFU can tolerate latency >= 40us or set it
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to 0 if it is latency sensitive.
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What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcmd
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Write-only. User writes command to this interface to set
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userclock to AFU.
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What: /sys/bus/platform/devices/dfl-port.0/userclk_freqsts
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. Read this file to get the status of issued command
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to userclck_freqcmd.
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What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcntrcmd
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Write-only. User writes command to this interface to set
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userclock counter.
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What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcntrsts
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. Read this file to get the status of issued command
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to userclck_freqcntrcmd.
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What: /sys/bus/platform/devices/dfl-port.0/errors/errors
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-Write. Read this file to get errors detected on port and
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Accelerated Function Unit (AFU). Write error code to this file
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to clear errors. Write fails with -EINVAL if input parsing
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fails or input error code doesn't match. Write fails with
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-EBUSY or -ETIMEDOUT if error can't be cleared as hardware
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in low power state (-EBUSY) or not respoding (-ETIMEDOUT).
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What: /sys/bus/platform/devices/dfl-port.0/errors/first_error
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. Read this file to get the first error detected by
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hardware.
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What: /sys/bus/platform/devices/dfl-port.0/errors/first_malformed_req
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Date: August 2019
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KernelVersion: 5.4
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Contact: Wu Hao <hao.wu@intel.com>
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Description: Read-only. Read this file to get the first malformed request
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captured by hardware.
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