[PATCH 1/9] drm: kselftest for drm_mm_init()

[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

Simple first test to just exercise initialisation of struct drm_mm.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_mm_selftests.h |  1 +
 drivers/gpu/drm/test-drm_mm.c      | 41 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/drm_mm_selftests.h b/drivers/gpu/drm/drm_mm_selftests.h
index 0a2e98a33ba0..8a9166f4626f 100644
--- a/drivers/gpu/drm/drm_mm_selftests.h
+++ b/drivers/gpu/drm/drm_mm_selftests.h
@@ -5,4 +5,5 @@
  *
  * Tests are executed in reverse order by igt/drm_mm
  */
+selftest(init, igt_init)
 selftest(sanitycheck, igt_sanitycheck) /* keep last */
diff --git a/drivers/gpu/drm/test-drm_mm.c b/drivers/gpu/drm/test-drm_mm.c
index 049f36b38868..d89615987303 100644
--- a/drivers/gpu/drm/test-drm_mm.c
+++ b/drivers/gpu/drm/test-drm_mm.c
@@ -20,6 +20,47 @@ 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, 0xff, sizeof(mm));
+	drm_mm_init(&mm, 0, 4096);
+	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;
+}
+
 #include "drm_selftest.c"
 
 static int __init test_drm_mm_init(void)
-- 
2.11.0

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