gputrace-gen

#!/bin/sh

BASE="/sys/kernel/debug/tracing"

CPU_TP="power:cpu_frequency
	power:cpu_idle
	sched:sched_wakeup
	sched:sched_switch"

DRM_TP="drm:drm_vblank_event"

I915_TP="i915:i915_gem_ring_dispatch
	 i915:i915_gem_request_add
	 i915:i915_gem_request_complete
	 i915:i915_gem_request_retire
	 i915:i915_gem_request_wait_begin
	 i915:i915_gem_request_wait_end
	 i915:i915_gem_evict
	 i915:i915_flip_request
	 i915:i915_flip_complete
	 i915:i915_ring_wait_begin
	 i915:i915_ring_wait_end
	 i915:intel_gpu_freq_change"

ALL_TP="$CPU_TP $DRM_TP $I915_TP"

if [ $# -lt 1 ]; then
	echo "Usage: $0 <start|stop|dump|<seconds>>"
	exit 1
fi

tp_clear() {
	path="$BASE/trace"
	echo > $path
}

tp_enable() {
	path="$BASE/set_event"
	echo "$ALL_TP" > $path
}

tp_disable() {
	path="$BASE/set_event"
	echo > $path
}

tp_dump() {
	path="$BASE/trace"
	cat $path
}

tp_pipe() {
	path="$BASE/trace_pipe"
	cat $path > $1 &
	return $!
}

case "$1" in
	start)
		tp_disable
		tp_clear
		tp_enable
		;;
	stop)
		tp_disable
		;;
	dump)
		tp_dump
		;;
	*)
		sleep 1

		# start
		tp_disable
		tp_clear
		tp_enable

		tp_pipe $1
		pipe_pid=$?

		# wait & stop
		sleep 5
		tp_disable

		sleep 1
		kill $pipe_pid
esac