tests: add i915_sfs_path

To access 'error_state' through sysfs.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/drm_lib.sh

@@ -29,4 +29,19 @@ if [ `cat $i915_dfs_path/clients | wc -l` -gt "2" ] ; then
 	die "ERROR: other drm clients running"
 fi
 
+if [ -d /sys/class/drm ] ; then
+    sysfs_path=/sys/class/drm
+fi
+
+i915_sfs_path=x
+for dir in `ls $sysfs_path` ; do
+    if [ -f $sysfs_path/$dir/error_state ] ; then
+	i915_sfs_path=$sysfs_path/$dir
+	break
+    fi
+done
+
+if [ $i915_sfs_path = "x" ] ; then
+    die " i915 sysfs path not found."
+fi