[PATCH 48/68] drm/i915: Add mock exercise for i915_gem_gtt_insert

[Chris Wilson]

i915_gem_gtt_insert should allocate from the available free space in the
GTT, evicting as necessary to create space.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 136 ++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 13652220316b..96935eca5eae 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -729,10 +729,146 @@ static int igt_gtt_reserve(void *arg)
 	return err;
 }
 
+static int igt_gtt_insert(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj, *on;
+	LIST_HEAD(objects);
+	u64 total;
+	int err;
+
+	/* i915_gem_gtt_insert() tries to allocate some free space in the GTT
+	 * to the node, evicting if required.
+	 */
+
+	/* Start by filling the GGTT */
+	for (total = 0; total + PAGE_SIZE <= i915->ggtt.base.total; total += PAGE_SIZE) {
+		struct i915_vma *vma;
+
+		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+		if (IS_ERR(obj)) {
+			err = PTR_ERR(obj);
+			goto err;
+		}
+
+		err = i915_gem_object_pin_pages(obj);
+		if (err) {
+			i915_gem_object_put(obj);
+			goto err;
+		}
+
+		list_add(&obj->batch_pool_link, &objects);
+
+		vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
+		if (IS_ERR(vma)) {
+			err = PTR_ERR(vma);
+			goto err;
+		}
+
+		err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
+					   obj->base.size, 0, obj->cache_level,
+					   0, i915->ggtt.base.total,
+					   0);
+		if (err) {
+			pr_err("i915_gem_gtt_insert (pass 1) failed at %llu/%llu with err=%d\n",
+			       total, i915->ggtt.base.total, err);
+			goto err;
+		}
+		track_vma_bind(vma);
+
+		GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+	}
+
+	/* If we then reinsert, we should find the same hole */
+	list_for_each_entry_safe(obj, on, &objects, batch_pool_link) {
+		struct i915_vma *vma;
+		u64 offset;
+
+		vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
+		if (IS_ERR(vma)) {
+			err = PTR_ERR(vma);
+			goto err;
+		}
+
+		GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+		offset = vma->node.start;
+
+		err = i915_vma_unbind(vma);
+		if (err) {
+			pr_err("i915_vma_unbind failed with err=%d!\n", err);
+			goto err;
+		}
+
+		err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
+					   obj->base.size, 0, obj->cache_level,
+					   0, i915->ggtt.base.total,
+					   0);
+		if (err) {
+			pr_err("i915_gem_gtt_insert (pass 2) failed at %llu/%llu with err=%d\n",
+			       total, i915->ggtt.base.total, err);
+			goto err;
+		}
+		track_vma_bind(vma);
+
+		GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+		if (vma->node.start != offset) {
+			pr_err("i915_gem_gtt_insert did not return node to its previous location (the only hole), expected address %llx, found %llx\n",
+			       offset, vma->node.start);
+			goto err;
+		}
+	}
+
+	/* And then force evictions */
+	for (total = 0; total + 2*PAGE_SIZE <= i915->ggtt.base.total; total += 2*PAGE_SIZE) {
+		struct i915_vma *vma;
+
+		obj = i915_gem_object_create_internal(i915, 2*PAGE_SIZE);
+		if (IS_ERR(obj)) {
+			err = PTR_ERR(obj);
+			goto err;
+		}
+
+		err = i915_gem_object_pin_pages(obj);
+		if (err) {
+			i915_gem_object_put(obj);
+			goto err;
+		}
+
+		list_add(&obj->batch_pool_link, &objects);
+
+		vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
+		if (IS_ERR(vma)) {
+			err = PTR_ERR(vma);
+			goto err;
+		}
+
+		err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
+					   obj->base.size, 0, obj->cache_level,
+					   0, i915->ggtt.base.total,
+					   0);
+		if (err) {
+			pr_err("i915_gem_gtt_insert (pass 1) failed at %llu/%llu with err=%d\n",
+			       total, i915->ggtt.base.total, err);
+			goto err;
+		}
+		track_vma_bind(vma);
+
+		GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+	}
+
+err:
+	list_for_each_entry_safe(obj, on, &objects, batch_pool_link) {
+		i915_gem_object_unpin_pages(obj);
+		i915_gem_object_put(obj);
+	}
+	return err;
+}
+
 int i915_gem_gtt_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_gtt_reserve),
+		SUBTEST(igt_gtt_insert),
 	};
 	struct drm_i915_private *i915;
 	int err;
-- 
2.11.0