[PATCH 14/49] drm/i915: Add a simple request selftest for waiting

[Chris Wilson]

A trivial kselftest to submit a request and wait upon it.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_request.c | 48 +++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 6553457adc77..9ba17d3e35cb 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -1601,10 +1601,58 @@ static int igt_add_request(void *ignore)
 	return err;
 }
 
+static int igt_wait_request(void *ignore)
+{
+	struct drm_i915_private *i915;
+	struct drm_i915_gem_request *request;
+	int err = -ENOMEM;
+
+	i915 = mock_device();
+	if (!i915)
+		goto out;
+
+	mutex_lock(&i915->drm.struct_mutex);
+	request = mock_request(i915->engine[RCS],
+			       i915->kernel_context,
+			       HZ / 2);
+	if (!request)
+		goto out_unlock;
+
+	i915_add_request(request);
+
+	if (i915_gem_request_completed(request)) {
+		pr_err("request completed immediately!\n");
+		goto out_unlock;
+	}
+
+	if (i915_wait_request(request, I915_WAIT_LOCKED, HZ / 4) != -ETIME) {
+		pr_err("request wait succeeded (expected tiemout!)\n");
+		goto out_unlock;
+	}
+
+	if (i915_wait_request(request, I915_WAIT_LOCKED, HZ / 2) == -ETIME) {
+		pr_err("request wait timed out!\n");
+		goto out_unlock;
+	}
+
+	if (!i915_gem_request_completed(request)) {
+		pr_err("request not complete after waiting!\n");
+		goto out_unlock;
+	}
+
+	err = 0;
+out_unlock:
+	mutex_unlock(&i915->drm.struct_mutex);
+	mock_device_free(i915);
+out:
+	return err;
+}
+
 int i915_gem_request_selftest(void)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_add_request),
+		SUBTEST(igt_wait_request),
 	};
 
 	return i915_subtests(tests, NULL);
-- 
2.11.0