[PATCH 09/34] drm: kselftest for drm_mm_insert_node()

[Chris Wilson]

Exercise drm_mm_insert_node(), check that we can't overfill a range and
that the lists are correct after reserving/removing.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/selftests/drm_mm_selftests.h |   1 +
 drivers/gpu/drm/selftests/test-drm_mm.c      | 209 +++++++++++++++++++++++++++
 2 files changed, 210 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 639913a69101..0927695c3fd4 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -5,6 +5,7 @@
  *
  * Tests are executed in reverse order by igt/drm_mm
  */
+selftest(insert, igt_insert)
 selftest(reserve, igt_reserve)
 selftest(debug, igt_debug)
 selftest(init, igt_init)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 13b2cfdb4d44..cd57a1de7f89 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -237,6 +237,215 @@ static int igt_reserve(void *ignored)
 	return 0;
 }
 
+static int __igt_insert(int count, u64 size)
+{
+	u32 lcg_state = random_seed;
+	struct drm_mm mm;
+	struct drm_mm_node *nodes, *node, *next;
+	int *order, n, o = 0;
+	int ret;
+
+	/* Fill a range with lots of nodes, check it doesn't fail too early */
+
+	ret = -ENOMEM;
+	nodes = vzalloc(count * sizeof(*nodes));
+	if (!nodes)
+		goto err;
+
+	order = drm_random_order(count, &lcg_state);
+	if (!order)
+		goto err_nodes;
+
+	ret = -EINVAL;
+	drm_mm_init(&mm, 0, count * size);
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	for (n = 0; n < count; n++) {
+		int err;
+
+		node = &nodes[n];
+		err = drm_mm_insert_node(&mm, node, size, 0,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("insert failed, step %d, start %llu\n",
+			       n, nodes[n].start);
+			ret = err;
+			goto out;
+		}
+
+		if (!drm_mm_node_allocated(node)) {
+			pr_err("inserted node not allocated! step %d, start %llu\n",
+			       n, node->start);
+			goto out;
+		}
+	}
+
+	/* Repeated use should then fail */
+	if (1) {
+		struct drm_mm_node tmp;
+
+		memset(&tmp, 0, sizeof(tmp));
+		if (!drm_mm_insert_node(&mm, &tmp, size, 0,
+					DRM_MM_SEARCH_DEFAULT)) {
+			drm_mm_remove_node(&tmp);
+			pr_err("impossible insert succeeded, step %d, start %llu\n",
+			       n, tmp.start);
+			goto out;
+		}
+	}
+
+	n = 0;
+	drm_mm_for_each_node(node, &mm) {
+		if (node->start != n * size) {
+			pr_err("node %d out of order, expected start %llx, found %llx\n",
+			       n, n * size, node->start);
+			goto out;
+		}
+
+		if (node->size != size) {
+			pr_err("node %d has wrong size, expected size %llx, found %llx\n",
+			       n, size, node->size);
+			goto out;
+		}
+
+		if (node->hole_follows) {
+			pr_err("node %d is followed by a hole!\n", n);
+			goto out;
+		}
+
+		n++;
+	}
+
+	for (n = 0; n < count; n++) {
+		drm_mm_for_each_node_in_range(node, &mm, n * size, (n + 1) * size) {
+			if (node->start != n * size) {
+				pr_err("lookup node %d out of order, expected start %llx, found %llx\n",
+				       n, n * size, node->start);
+				goto out;
+			}
+		}
+	}
+
+	/* Remove one and reinsert, as the only hole it should refill itself */
+	for (n = 0; n < count; n++) {
+		int err;
+
+		drm_mm_remove_node(&nodes[n]);
+		err = drm_mm_insert_node(&mm, &nodes[n], size, 0,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("reinsert failed, step %d\n", n);
+			ret = err;
+			goto out;
+		}
+
+		if (nodes[n].start != n * size) {
+			pr_err("reinsert node moved, step %d, expected %llx, found %llx\n",
+			       n, n * size, nodes[n].start);
+			goto out;
+		}
+	}
+
+	/* Remove several, reinsert, check full */
+	drm_for_each_prime(n, min(128, count)) {
+		int m;
+
+		for (m = 0; m < n; m++) {
+			node = &nodes[order[(o + m) % count]];
+			drm_mm_remove_node(node);
+		}
+
+		for (m = 0; m < n; m++) {
+			int err;
+
+			node = &nodes[order[(o + m) % count]];
+			err = drm_mm_insert_node(&mm, node, size, 0,
+						 DRM_MM_SEARCH_DEFAULT);
+			if (err) {
+				pr_err("insert failed, step %d, start %llu\n",
+				       n, node->start);
+				ret = err;
+				goto out;
+			}
+		}
+
+		o += n;
+
+		if (1) {
+			struct drm_mm_node tmp;
+
+			memset(&tmp, 0, sizeof(tmp));
+			if (!drm_mm_insert_node(&mm, &tmp, size, 0,
+						DRM_MM_SEARCH_DEFAULT)) {
+				drm_mm_remove_node(&tmp);
+				pr_err("impossible insert succeeded, start %llu\n",
+				       tmp.start);
+				goto out;
+			}
+		}
+
+		m = 0;
+		drm_mm_for_each_node(node, &mm) {
+			if (node->start != m * size) {
+				pr_err("node %d out of order, expected start %llx, found %llx\n",
+				       m, m * size, node->start);
+				goto out;
+			}
+
+			if (node->size != size) {
+				pr_err("node %d has wrong size, expected size %llx, found %llx\n",
+				       m, size, node->size);
+				goto out;
+			}
+
+			if (node->hole_follows) {
+				pr_err("node %d is followed by a hole!\n", m);
+				goto out;
+			}
+
+			m++;
+		}
+	}
+
+	ret = 0;
+out:
+	drm_mm_for_each_node_safe(node, next, &mm)
+		drm_mm_remove_node(node);
+	drm_mm_takedown(&mm);
+	kfree(order);
+err_nodes:
+	vfree(nodes);
+err:
+	return ret;
+}
+
+static int igt_insert(void *ignored)
+{
+	const unsigned int count = BIT(10);
+	int n, ret;
+
+	drm_for_each_prime(n, 54) {
+		u64 size = BIT_ULL(n);
+
+		ret = __igt_insert(count, size - 1);
+		if (ret)
+			return ret;
+
+		ret = __igt_insert(count, size);
+		if (ret)
+			return ret;
+
+		ret = __igt_insert(count, size + 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 #include "drm_selftest.c"
 
 static int __init test_drm_mm_init(void)
-- 
2.11.0