[Intel-gfx] [PATCH 14/16] 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 <ch...@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

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