[PATCH 1/3] drm/i915/selftests: Increase size for mock ringbuffer

[Chris Wilson <chris@chris-wilson.co.uk>]

We don't actually emit any commands into the ringbuffer, so we set it
very small. However, an upcoming change centralises the wait-for-space
into i915_gem_request_alloc() and that imposes a minimum size upon all
ringbuffers (mock or real) of MIN_SPACE_FOR_ADD_REQUEST. Grow the
mock ringbuffer such that we allocate a single page for the struct+buffer,
satisfying the new condition without wasting too much space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/selftests/mock_engine.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index 0aafa8a105b8..55c0e2c15782 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -124,9 +124,11 @@ static void mock_submit_request(struct drm_i915_gem_request *request)
 
 static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
 {
-	const unsigned long sz = roundup_pow_of_two(sizeof(struct intel_ring));
+	const unsigned long sz = PAGE_SIZE / 2;
 	struct intel_ring *ring;
 
+	BUILD_BUG_ON(MIN_SPACE_FOR_ADD_REQUEST > sz);
+
 	ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
 	if (!ring)
 		return NULL;
-- 
2.15.0

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