[PATCH v4 07/38] drm: kselftest for drm_mm_init()

Chris Wilson
2016-12-22T08:36:10Z

Simple first test to just exercise initialisation of struct drm_mm.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
drivers/gpu/drm/selftests/drm_mm_selftests.h | 1 +
drivers/gpu/drm/selftests/test-drm_mm.c | 114 +++++++++++++++++++++++++++
2 files changed, 115 insertions(+)

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 1610e0a63a5b..844dd29db540 100644
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -6,3 +6,4 @@
* Tests are executed in order by igt/drm_mm
*/
selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
+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 682f5f86f465..87ad147670da 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -27,6 +27,120 @@ static int igt_sanitycheck(void *ignored)
return 0;
}

+static bool assert_no_holes(const struct drm_mm *mm)
+{
+ struct drm_mm_node *hole;
+ u64 hole_start, hole_end;
+ unsigned long count;
+
+ count = 0;
+ drm_mm_for_each_hole(hole, mm, hole_start, hole_end)
+ count++;
+ if (count) {
+ pr_err("Expected to find no holes (after reserve), found %lu instead\n", count);
+ return false;
+ }
+
+ drm_mm_for_each_node(hole, mm) {
+ if (hole->hole_follows) {
+ pr_err("Hole follows node, expected none!\n");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool assert_one_hole(const struct drm_mm *mm, u64 start, u64 end)
+{
+ struct drm_mm_node *hole;
+ u64 hole_start, hole_end;
+ unsigned long count;
+ bool ok = true;
+
+ if (end <= start)
+ return true;
+
+ count = 0;
+ drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
+ if (start != hole_start || end != hole_end) {
+ if (ok)
+ pr_err("empty mm has incorrect hole, found (%llx, %llx), expect (%llx, %llx)\n",
+ hole_start, hole_end,
+ start, end);
+ ok = false;
+ }
+ count++;
+ }
+ if (count != 1) {
+ pr_err("Expected to find one hole, found %lu instead\n", count);
+ ok = false;
+ }
+
+ return ok;
+}
+
+static int igt_init(void *ignored)
+{
+ const unsigned int size = 4096;
+ struct drm_mm mm;
+ struct drm_mm_node tmp;
+ int ret = -EINVAL;
+
+ /* Start with some simple checks on initialising the struct drm_mm */
+ 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, size);
+ 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;
+ }
+
+ /* After creation, it should all be one massive hole */
+ if (!assert_one_hole(&mm, 0, size)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.start = 0;
+ tmp.size = size;
+ ret = drm_mm_reserve_node(&mm, &tmp);
+ if (ret) {
+ pr_err("failed to reserve whole drm_mm\n");
+ goto out;
+ }
+
+ /* After filling the range entirely, there should be no holes */
+ if (!assert_no_holes(&mm)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* And then after emptying it again, the massive hole should be back */
+ drm_mm_remove_node(&tmp);
+ if (!assert_one_hole(&mm, 0, size)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+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)