root@providius://sys/kernel/debug/tracing# cat events/hda/enable
1
root@providius://sys/kernel/debug/tracing# cat set_event
hda:hda_send_cmd
hda:hda_get_response
hda:hda_bus_reset
hda:hda_power_down
hda:hda_power_up
hda:hda_power_count
hda:hda_unsol_event
root@providius://sys/kernel/debug/tracing# cat tracing_on
1
root@providius://sys/kernel/debug/tracing# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 0/0   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
root@providius://sys/kernel/debug/tracing#