drm_panic test script

gistfile1.txt

#!/bin/bash

cols=228
rows=61

DRM_PANIC_MAX_KMSGS=4096

function pr_emerg {
	echo "<2>"$1 > /dev/kmsg
}

function drm_panic_clear_kmsgs {
	echo 100 > /sys/kernel/debug/dri/panic-test
}

function drm_panic_test {
	echo 101 > /sys/kernel/debug/dri/panic-test
}

function drm_panic_test_cleanup {
	echo 102 > /sys/kernel/debug/dri/panic-test
}

function test_full_screen {
	drm_panic_clear_kmsgs

	pr_emerg 'Append line test - this should stay as the top line'

	drm_panic_test

	h=$((rows - 2))
	w=$((cols - 23))

	for i in `seq 1 $h`;
	do
		printf "<2>%-3u%*s%3u\n" $i $w ' ' $i > /dev/kmsg
	done

	pr_emerg 'Append line test - this should be the bottom line'

	drm_panic_test_cleanup
}

function test_scroll_up {
	drm_panic_clear_kmsgs

	pr_emerg 'Scroll up test - this line should scroll out'
	pr_emerg 'Scroll up test - this line should stay'

	drm_panic_test

	h=$((rows - 3))

	for i in `seq 1 $h`;
	do
		printf "<2>%3u\n" $i > /dev/kmsg
	done

	pr_emerg 'Scroll up test - second last line'
	pr_emerg 'Scroll up test - this should be the last line'

	drm_panic_test_cleanup
}

function test_line_wrap {
	drm_panic_clear_kmsgs

	pr_emerg 'Line wrap test - this should stay as the top line'

	drm_panic_test

	h=$((rows / 2))
	w=$(((cols * 3 / 2) - 23))

	for ((i = 1 ; i < h ; i++))
	do
		printf "<2>%-3u%*s%3u\n" $i $w ' ' $i > /dev/kmsg
	done

	if (( rows % 2 )); then
		pr_emerg 'Second last line'
	fi

	pr_emerg 'Line wrap test - this should be the last line'

	drm_panic_test_cleanup
}

# test the situation where the buffer has just wrapped around
function test_precise_wrap_around {
	drm_panic_clear_kmsgs

	# use strings that are 64 characters long when outputted including newline
	# format: [    0.000000] Booting Linux on physical CPU 0x0

	pr_emerg 'Test kmsg buffer wrap around with pos=0.........'

	lines=$((DRM_PANIC_MAX_KMSGS / 64))

	for ((i = 1 ; i < lines ; i++))
	do
		printf "<2>%-4u 123456789 123456789 123456789 123456789 123\n" $i > /dev/kmsg
	done

	drm_panic_test

	pr_emerg 'drm_panic_kmsgs_pos should be zero after the previous message'

	drm_panic_test_cleanup
}



# Use to enable pipeline if fbdev is disabled
#coproc ./libdrm/tests/modetest/modetest -M "simpledrm" -s 23:1824x984
#sleep 2

case $1 in
1)
	test_full_screen
	;;
2)
	test_scroll_up
	;;
3)
	test_line_wrap
	;;
4)
	test_precise_wrap_around
	;;
*)
	echo "No such test"
	;;
esac

#echo >&${COPROC[1]}