Add a i915_vma to the mock_engine/mock_ring so that the core code can
always assume the presence of ring->vma.

Fixes: 8ccfc20a7d56 ("drm/i915/gt: Mark ring->vma as active while pinned")
Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
---
 drivers/gpu/drm/i915/gt/mock_engine.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c 
b/drivers/gpu/drm/i915/gt/mock_engine.c
index a560b7eee2cd..f2806381733f 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -59,11 +59,26 @@ static struct intel_ring *mock_ring(struct intel_engine_cs 
*engine)
        ring->vaddr = (void *)(ring + 1);
        atomic_set(&ring->pin_count, 1);
 
+       ring->vma = i915_vma_alloc();
+       if (!ring->vma) {
+               kfree(ring);
+               return NULL;
+       }
+       i915_active_init(&ring->vma->active, NULL, NULL);
+
        intel_ring_update_space(ring);
 
        return ring;
 }
 
+static void mock_ring_free(struct intel_ring *ring)
+{
+       i915_active_fini(&ring->vma->active);
+       i915_vma_free(ring->vma);
+
+       kfree(ring);
+}
+
 static struct i915_request *first_request(struct mock_engine *engine)
 {
        return list_first_entry_or_null(&engine->hw_queue,
@@ -121,7 +136,7 @@ static void mock_context_destroy(struct kref *ref)
        GEM_BUG_ON(intel_context_is_pinned(ce));
 
        if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
-               kfree(ce->ring);
+               mock_ring_free(ce->ring);
                mock_timeline_unpin(ce->timeline);
        }
 
-- 
2.25.0.rc2

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