[Intel-gfx] [RFCv2 02/19] kselftests: Exercise hw-independent mock tests for i915.ko

[Chris Wilson]

Although being a GPU driver most functionality of i915.ko depends upon
real hardware, many of its internal interfaces can be "mocked" and so
tested independently of any hardware. Expanding the test coverage is not
only useful for i915.ko, but should provide some integration tests for
core infrastructure as well.

Loading i915.ko with mock_selftests=-1 will cause it to execute its mock
tests then exit before attempting to probe hardware. If the driver is
already loaded and bound to hardware, it requires a few more steps to
unbind, and so the simple preliminary modprobe -r will fail, causing the
test to be skipped.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
---
 tools/testing/selftests/drivers/gpu/i915.sh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100755 tools/testing/selftests/drivers/gpu/i915.sh

diff --git a/tools/testing/selftests/drivers/gpu/i915.sh b/tools/testing/selftests/drivers/gpu/i915.sh
new file mode 100755
index 000000000000..c06d6e8a8dcc
--- /dev/null
+++ b/tools/testing/selftests/drivers/gpu/i915.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+# Runs hardware independent tests for i915 (drivers/gpu/drm/i915)
+
+if ! /sbin/modprobe -q -r i915; then
+	echo "drivers/gpu/i915: [SKIP]"
+	exit 77
+fi
+
+if /sbin/modprobe -q i915 mock_selftests=-1; then
+	/sbin/modprobe -q -r i915
+	echo "drivers/gpu/i915: ok"
+else
+	echo "drivers/gpu/i915: [FAIL]"
+	exit 1
+fi
-- 
2.11.0