List writable render devices with no render-device.sh args

To help debugging potential kubernetes device usage issues.

Signed-off-by: Eero Tamminen <eero.t.tamminen@intel.com>

Author: eero-t

cmd/gpu_plugin/render-device.sh

@@ -22,7 +22,7 @@
 # all distro base images.  The required tools, and the packages they
 # reside in Debian based distros, are:
 # - dash: 'sh' (minimal bourne shell)
-# - coreutils: 'seq', 'cat', 'echo'
+# - coreutils: 'seq', 'cat', 'echo', 'id'
 # - sed: 'sed'
 #
 # But they are also provided by 'busybox' and 'toybox' tool sets.
@@ -35,6 +35,9 @@ usage ()
 	echo "on standard output, or added to given command line. If device index"
 	echo "N is given, provides name of Nth available (Intel GPU) render device."
 	echo
+	echo "With no arguments, outputs Intel GPU render devices count from sysfs,"
+	echo "and how many of them are writable in devfs."
+	echo
 	echo "Usage:"
 	echo "  $name <device index>"
 	echo "  $name [device index] <media program> [other options] <GPU selection option>"
@@ -48,8 +51,29 @@ usage ()
 	exit 1
 }
 
+intel="0x8086"
 if [ $# -eq 0 ]; then
-	usage "no arguments given"
+	syscount=0
+	devcount=0
+	for i in $(seq 128 255); do
+		devfile="/dev/dri/renderD$i"
+		sysfile="/sys/class/drm/renderD$i/device/vendor"
+		if [ ! -r "$sysfile" ]; then
+			continue
+		fi
+		vendor=$(cat "$sysfile")
+		if [ "$vendor" != "$intel" ]; then
+			continue
+		fi
+		syscount=$((syscount+1))
+		if [ -w "$devfile" ]; then
+			devcount=$((devcount+1))
+		fi
+	done
+	echo "$syscount Intel GPU render device(s) listed in sysfs, $devcount writable one(s) in devfs:"
+	ls -l /dev/dri/
+	echo "User: $(id)"
+	exit 0
 fi
 
 # determine required GPU index
@@ -66,7 +90,6 @@ fi
 visible=0
 
 vendor=""
-intel="0x8086"
 # find host index "i" for Nth visible Intel GPU device
 for i in $(seq 128 255); do
 	if [ -w "/dev/dri/renderD$i" ]; then