drm: kselftest for drm_mm_debug()

Simple test to just exercise calling the debug dumper on the drm_mm.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-9-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index 844dd29db54022e27d82082452156a857ff74edc..0265f09e92fa60227c262819d6ca4a3d403f3718 100644 (file)
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -7,3 +7,4 @@
  */
 selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
 selftest(init, igt_init)
+selftest(debug, igt_debug)

diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 87ad147670da71f92ae2807648d9ad2529e8146a..434320061d9e284a27b007827267de123977f940 100644 (file)
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -141,6 +141,41 @@ out:
        return ret;
 }
 
+static int igt_debug(void *ignored)
+{
+       struct drm_mm mm;
+       struct drm_mm_node nodes[2];
+       int ret;
+
+       /* Create a small drm_mm with a couple of nodes and a few holes, and
+        * check that the debug iterator doesn't explode over a trivial drm_mm.
+        */
+
+       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].size = 1024;
+       nodes[1].start = 4096 - 512 - nodes[1].size;
+       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)