ntel-gpu-tools/tests/drv_missed_irq_hang

#!/bin/bash
#
# Testcase: Simulate missed breadcrumb interrupts
#

SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
. $SOURCE_DIR/drm_lib.sh

oldpath=`pwd`

cd $i915_dfs_path

function blt_wait {
	$oldpath/$SOURCE_DIR/../benchmarks/gem_blt -r 1 -b 64 -t 1 -S > /dev/null
}

function check_for_missed_irq {
	test `cat i915_ring_missed_irq` != 0x00000000
}

function check_for_hang {
	if cat i915_error_state | grep -v "no error state collected" > /dev/null ; then
		echo "gpu hang reported"
		exit $IGT_EXIT_FAILURE
	fi
}

if [ ! -f i915_ring_missed_irq ] ; then
	echo "kernel doesn't support interrupt masking"
	exit $IGT_EXIT_SKIP
fi

# clear error state first
echo > i915_error_state
blt_wait
if check_for_missed_irq; then
	echo "missed interrupts detected before starting test"
	exit $IGT_EXIT_SKOP
fi
check_for_hang

echo 0xf > i915_ring_test_irq
echo "Interrupts masked"
if test `cat i915_ring_test_irq` != 0x0000000f; then
	echo "Failed to set interrupt mask"
	exit $IGT_EXIT_FAILURE
fi

blt_wait
if ! check_for_missed_irq; then
	echo "missed interrupts undetected"
	exit $IGT_EXIT_FAILURE
fi
check_for_hang

echo 0 > i915_ring_test_irq
echo "Interrupts unmasked"
if test `cat i915_ring_test_irq` != 0x00000000; then
	echo "Failed to clear interrupt mask"
	exit $IGT_EXIT_FAILURE
fi

blt_wait
check_for_hang

echo 0 > i915_ring_missed_irq
echo "Cleared missed interrupts"
if test `cat i915_ring_missed_irq` != 0x00000000; then
	echo "Failed to clear missed interrupts"
	exit $IGT_EXIT_FAILURE
fi

blt_wait
if check_for_missed_irq; then
	echo "missed interrupts detected afterwards"
	exit $IGT_EXIT_FAILURE
fi
check_for_hang

exit $IGT_EXIT_SUCCESS