drm/i915: Add a simple fence selftest to i915_gem_request

Do a quick selftest on in the interoperability of dma_fence_wait on a
i915_gem_request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-12-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_request.c b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
index 3cbf473..6fa148b 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
@@ -119,11 +119,72 @@ out_unlock:
        return err;
 }
 
+static int igt_fence_wait(void *arg)
+{
+       const long T = HZ / 4;
+       struct drm_i915_private *i915 = arg;
+       struct drm_i915_gem_request *request;
+       int err = -EINVAL;
+
+       /* Submit a request, treat it as a fence and wait upon it */
+
+       mutex_lock(&i915->drm.struct_mutex);
+       request = mock_request(i915->engine[RCS], i915->kernel_context, T);
+       if (!request) {
+               err = -ENOMEM;
+               goto out_locked;
+       }
+       mutex_unlock(&i915->drm.struct_mutex); /* safe as we are single user */
+
+       if (dma_fence_wait_timeout(&request->fence, false, T) != -ETIME) {
+               pr_err("fence wait success before submit (expected timeout)!\n");
+               goto out_device;
+       }
+
+       mutex_lock(&i915->drm.struct_mutex);
+       i915_add_request(request);
+       mutex_unlock(&i915->drm.struct_mutex);
+
+       if (dma_fence_is_signaled(&request->fence)) {
+               pr_err("fence signaled immediately!\n");
+               goto out_device;
+       }
+
+       if (dma_fence_wait_timeout(&request->fence, false, T / 2) != -ETIME) {
+               pr_err("fence wait success after submit (expected timeout)!\n");
+               goto out_device;
+       }
+
+       if (dma_fence_wait_timeout(&request->fence, false, T) <= 0) {
+               pr_err("fence wait timed out (expected success)!\n");
+               goto out_device;
+       }
+
+       if (!dma_fence_is_signaled(&request->fence)) {
+               pr_err("fence unsignaled after waiting!\n");
+               goto out_device;
+       }
+
+       if (dma_fence_wait_timeout(&request->fence, false, T) <= 0) {
+               pr_err("fence wait timed out when complete (expected success)!\n");
+               goto out_device;
+       }
+
+       err = 0;
+out_device:
+       mutex_lock(&i915->drm.struct_mutex);
+out_locked:
+       mock_device_flush(i915);
+       mutex_unlock(&i915->drm.struct_mutex);
+       return err;
+}
+
 int i915_gem_request_mock_selftests(void)
 {
        static const struct i915_subtest tests[] = {
                SUBTEST(igt_add_request),
                SUBTEST(igt_wait_request),
+               SUBTEST(igt_fence_wait),
        };
        struct drm_i915_private *i915;
        int err;