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#!/bin/bash
#
# Testcase: Simulate gpu hang
#
# This check uses the stop_rings facility to exercise the gpu hang code.
# by reading /sys/kernel/debug/dri/0/i915_emon_status too quickly
#
SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
. $SOURCE_DIR/drm_lib.sh
oldpath=`pwd`
cd $i915_path
if [ ! -f i915_ring_stop ] ; then
echo "kernel doesn't support ring stopping"
exit 77
fi
if cat i915_error_state | grep -v "no error state collected" > /dev/null ; then
echo "gpu hang dectected"
exit 1
fi
# stop rings
echo 0xf > i915_ring_stop
echo "rings stopped"
$oldpath/$SOURCE_DIR/gem_exec_nop > /dev/null
if cat i915_error_state | grep -v "no error state collected" > /dev/null ; then
echo "gpu hang correctly dectected"
else
echo "gpu hang not dectected"
exit 2
fi
# clear error state
echo > i915_error_state
exit 0
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