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HID Driver Description
MLNXBFD0 mlxbf-pmc Performance counters (BlueField-1)
MLNXBFD1 mlxbf-pmc Performance counters (BlueField-2)
MLNXBFD2 mlxbf-pmc Performance counters (BlueField-3)
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event_list
Date: Dec 2020
KernelVersion: 5.10
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
List of events supported by the counters in the specific block.
It is used to extract the event number or ID associated with
each event.
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/event<N>
Date: Dec 2020
KernelVersion: 5.10
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
Event monitored by corresponding counter. This is used to
program or read back the event that should be or is currently
being monitored by counter<N>.
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/counter<N>
Date: Dec 2020
KernelVersion: 5.10
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
Counter value of the event being monitored. This is used to
read the counter value of the event which was programmed using
event<N>. This is also used to clear or reset the counter value
by writing 0 to the counter sysfs.
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/enable
Date: Dec 2020
KernelVersion: 5.10
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
Start or stop counters. This is used to start the counters
for monitoring the programmed events and also to stop the
counters after the desired duration. Writing value 1 will
start all the counters in the block, and writing 0 will
stop all the counters together.
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/<reg>
Date: Dec 2020
KernelVersion: 5.10
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
Value of register. This is used to read or reset the registers
where various performance statistics are counted for each block.
Writing 0 to the sysfs will clear the counter, writing any other
value is not allowed.
What: /sys/bus/platform/devices/<HID>/hwmon/hwmonX/<block>/count_clock
Date: Mar 2025
KernelVersion: 6.14
Contact: "Shravan Kumar Ramani <shravankr@nvidia.com>"
Description:
Use a counter for counting cycles. This is used to repurpose/dedicate
any of the counters in the block to counting cycles. Each counter is
represented by a bit (bit 0 for counter0, bit1 for counter1 and so on)
and setting the corresponding bit will reserve that specific counter
for counting cycles and override the event<N> setting.
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