test_firmware: add simple firmware firmware test library

We'll expland on this later, for now just add basic module checker.
While at it, move this all to use /bin/bash as we'll have much more
flexibility with it.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 51 insertions, 20 deletions

diff --git a/tools/testing/selftests/firmware/fw_fallback.sh b/tools/testing/selftests/firmware/fw_fallback.sh
index 722cad91df74..755147a8c967 100755
--- a/tools/testing/selftests/firmware/fw_fallback.sh
+++ b/tools/testing/selftests/firmware/fw_fallback.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 # This validates that the kernel will fall back to using the fallback mechanism
 # to load firmware it can't find on disk itself. We must request a firmware
@@ -6,9 +6,10 @@
 # won't find so that we can do the load ourself manually.
 set -e
 
-modprobe test_firmware
+TEST_DIR=$(dirname $0)
+source $TEST_DIR/fw_lib.sh
 
-DIR=/sys/devices/virtual/misc/test_firmware
+check_mods
 
 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
 # These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
index f9508e1a4058..748f2f5737e9 100755
--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 # This validates that the kernel will load firmware out of its list of
 # firmware locations on disk. Since the user helper does similar work,
@@ -6,24 +6,10 @@
 # know so we can be sure we're not accidentally testing the user helper.
 set -e
 
-DIR=/sys/devices/virtual/misc/test_firmware
 TEST_DIR=$(dirname $0)
+source $TEST_DIR/fw_lib.sh
 
-test_modprobe()
-{
-        if [ ! -d $DIR ]; then
-                echo "$0: $DIR not present"
-                echo "You must have the following enabled in your kernel:"
-                cat $TEST_DIR/config
-                exit 1
-        fi
-}
-
-trap "test_modprobe" EXIT
-
-if [ ! -d $DIR ]; then
-        modprobe test_firmware
-fi
+check_mods
 
 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
 # These days most distros enable CONFIG_FW_LOADER_USER_HELPER but disable
diff --git a/tools/testing/selftests/firmware/fw_lib.sh b/tools/testing/selftests/firmware/fw_lib.sh
new file mode 100755
index 000000000000..c14bbca7ecf9
--- /dev/null
+++ b/tools/testing/selftests/firmware/fw_lib.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Library of helpers for test scripts.
+set -e
+
+DIR=/sys/devices/virtual/misc/test_firmware
+
+PROC_CONFIG="/proc/config.gz"
+TEST_DIR=$(dirname $0)
+
+print_reqs_exit()
+{
+        echo "You must have the following enabled in your kernel:" >&2
+        cat $TEST_DIR/config >&2
+        exit 1
+}
+
+test_modprobe()
+{
+        if [ ! -d $DIR ]; then
+                print_reqs_exit
+        fi
+}
+
+check_mods()
+{
+        trap "test_modprobe" EXIT
+        if [ ! -d $DIR ]; then
+                modprobe test_firmware
+        fi
+        if [ ! -f $PROC_CONFIG ]; then
+                if modprobe configs 2>/dev/null; then
+                        echo "Loaded configs module"
+                        if [ ! -f $PROC_CONFIG ]; then
+                                echo "You must have the following enabled in your kernel:" >&2
+                                cat $TEST_DIR/config >&2
+                                echo "Resorting to old heuristics" >&2
+                        fi
+                else
+                        echo "Failed to load configs module, using old heuristics" >&2
+                fi
+        fi
+}