[PATCH 05/34] drm: kselftest for drm_mm_init()

[Chris Wilson]

Simple first test to just exercise initialisation of struct drm_mm.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/selftests/drm_mm_selftests.h |  2 +
 drivers/gpu/drm/selftests/test-drm_mm.c      | 83 ++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 0a2e98a33ba0..fddf2c01c97f 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -5,4 +5,6 @@
  *
  * Tests are executed in reverse order by igt/drm_mm
  */
+selftest(debug, igt_debug)
+selftest(init, igt_init)
 selftest(sanitycheck, igt_sanitycheck) /* keep last */
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index b06590c860e2..1fe104cc05d5 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -22,6 +22,89 @@ static int igt_sanitycheck(void *ignored)
 	return 0;
 }
 
+static int igt_init(void *ignored)
+{
+	struct drm_mm mm;
+	struct drm_mm_node *hole;
+	struct drm_mm_node tmp;
+	u64 start, end;
+	int ret = -EINVAL;
+
+	memset(&mm, 0, sizeof(mm));
+	if (drm_mm_initialized(&mm)) {
+		pr_err("zeroed mm claims to be initialized\n");
+		return ret;
+	}
+
+	memset(&mm, 0xff, sizeof(mm));
+	drm_mm_init(&mm, 0, 4096);
+	if (!drm_mm_initialized(&mm)) {
+		pr_err("mm claims not to be initialized\n");
+		goto out;
+	}
+
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	drm_mm_for_each_hole(hole, &mm, start, end) {
+		if (start != 0 || end != 4096) {
+			pr_err("empty mm has incorrect hole, found (%llx, %llx), expect (%llx, %llx)\n",
+			       start, end,
+			       0ull, 4096ull);
+			goto out;
+		}
+	}
+
+	memset(&tmp, 0, sizeof(tmp));
+	tmp.start = 0;
+	tmp.size = 4096;
+	ret = drm_mm_reserve_node(&mm, &tmp);
+	if (ret) {
+		pr_err("failed to reserve whole drm_mm\n");
+		goto out;
+	}
+	drm_mm_remove_node(&tmp);
+
+out:
+	if (ret)
+		drm_mm_debug_table(&mm, __func__);
+	drm_mm_takedown(&mm);
+	return ret;
+}
+
+static int igt_debug(void *ignored)
+{
+	struct drm_mm mm;
+	struct drm_mm_node nodes[2];
+	int ret;
+
+	drm_mm_init(&mm, 0, 4096);
+
+	memset(nodes, 0, sizeof(nodes));
+	nodes[0].start = 512;
+	nodes[0].size = 1024;
+	ret = drm_mm_reserve_node(&mm, &nodes[0]);
+	if (ret) {
+		pr_err("failed to reserve node[0] {start=%lld, size=%lld)\n",
+		       nodes[0].start, nodes[0].size);
+		return ret;
+	}
+
+	nodes[1].start = 512 - 1024 - 512;
+	nodes[1].size = 1024;
+	ret = drm_mm_reserve_node(&mm, &nodes[1]);
+	if (ret) {
+		pr_err("failed to reserve node[1] {start=%lld, size=%lld)\n",
+		       nodes[1].start, nodes[1].size);
+		return ret;
+	}
+
+	drm_mm_debug_table(&mm, __func__);
+	return 0;
+}
+
 #include "drm_selftest.c"
 
 static int __init test_drm_mm_init(void)
-- 
2.11.0