[Intel-gfx] [PATCH i-g-t v4 18/20] tests/core_hotunplug: Add 'lateclose before restore' variants

[Janusz Krzysztofik]

If a GPU gets wedged during driver rebind or device re-plug for some
reason, current hotunbind/hotunplug test variants may time out before
lateclose phase, resulting in incomplete CI reports.  Rename those
variants to more adequate hotrebind/hotreplug-lateclose and add new
variants under the old names focused on exercising the lateclose phase
regardless of potential rediscover/rebind issues.  Moreover, add two
more variants which exercise driver rebind / device restore after late
close specifically.

v2: Rebase on upstream.
v3: Refresh,
  - further rename hotunbind/hotunplug-lateclose to hotunbind-rebind
    and hotunplug-rescan respectively, then add two more variants under
    the old names which only exercise late close, leaving rebind /
    rescan to be cared of in the post-subtest recovery phase,
  - also update descriptions of unmodified subtests for consistency.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski at intel.com> # v2
---
 tests/core_hotunplug.c | 114 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 109 insertions(+), 5 deletions(-)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index 13e7aa46f..f919fa6de 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -369,8 +369,6 @@ static void hotunbind_lateclose(struct hotunplug *priv)
 
 	driver_unbind(priv, "hot ", 0);
 
-	driver_bind(priv, 60);
-
 	igt_debug("late closing the unbound device instance\n");
 	priv->fd.drm = close_device(priv->fd.drm);
 	igt_assert_eq(priv->fd.drm, -1);
@@ -382,11 +380,69 @@ static void hotunplug_lateclose(struct hotunplug *priv)
 
 	device_unplug(priv, "hot ", 0);
 
-	bus_rescan(priv, 60);
+	igt_debug("late closing the removed device instance\n");
+	priv->fd.drm = close_device(priv->fd.drm);
+	igt_assert_eq(priv->fd.drm, -1);
+}
+
+static void hotunbind_rebind(struct hotunplug *priv)
+{
+	priv->fd.drm = local_drm_open_driver("", " for hotrebind");
+
+	driver_unbind(priv, "hot ", 60);
+
+	igt_debug("late closing the unbound device instance\n");
+	priv->fd.drm = close_device(priv->fd.drm);
+	igt_assert_eq(priv->fd.drm, -1);
+
+	driver_bind(priv, 0);
+
+	healthcheck(priv, false);
+}
+
+static void hotunplug_rescan(struct hotunplug *priv)
+{
+	priv->fd.drm = local_drm_open_driver("", " for hotreplug");
+
+	device_unplug(priv, "hot ", 60);
+
+	igt_debug("late closing the removed device instance\n");
+	priv->fd.drm = close_device(priv->fd.drm);
+	igt_assert_eq(priv->fd.drm, -1);
+
+	bus_rescan(priv, 0);
+
+	healthcheck(priv, false);
+}
+
+static void hotrebind_lateclose(struct hotunplug *priv)
+{
+	priv->fd.drm = local_drm_open_driver("", " for hotrebind");
+
+	driver_unbind(priv, "hot ", 60);
+
+	driver_bind(priv, 0);
+
+	igt_debug("late closing the unbound device instance\n");
+	priv->fd.drm = close_device(priv->fd.drm);
+	igt_assert_eq(priv->fd.drm, -1);
+
+	healthcheck(priv, false);
+}
+
+static void hotreplug_lateclose(struct hotunplug *priv)
+{
+	priv->fd.drm = local_drm_open_driver("", " for hotreplug");
+
+	device_unplug(priv, "hot ", 60);
+
+	bus_rescan(priv, 0);
 
 	igt_debug("late closing the removed device instance\n");
 	priv->fd.drm = close_device(priv->fd.drm);
 	igt_assert_eq(priv->fd.drm, -1);
+
+	healthcheck(priv, false);
 }
 
 /* Main */
@@ -419,7 +475,7 @@ igt_main
 	}
 
 	igt_subtest_group {
-		igt_describe("Check if the driver can be cleanly unbound from a device believed to be closed");
+		igt_describe("Check if the driver can be cleanly unbound from a device believed to be closed, then rebound");
 		igt_subtest("unbind-rebind")
 			unbind_rebind(&priv);
 
@@ -431,7 +487,7 @@ igt_main
 		post_healthcheck(&priv);
 
 	igt_subtest_group {
-		igt_describe("Check if a device believed to be closed can be cleanly unplugged");
+		igt_describe("Check if a device believed to be closed can be cleanly unplugged, then restored");
 		igt_subtest("unplug-rescan")
 			unplug_rescan(&priv);
 
@@ -463,6 +519,54 @@ igt_main
 			recover(&priv);
 	}
 
+	igt_fixture
+		post_healthcheck(&priv);
+
+	igt_subtest_group {
+		igt_describe("Check if the driver can be cleanly rebound to a device after hotunbind-lateclose");
+		igt_subtest("hotunbind-rebind")
+			hotunbind_rebind(&priv);
+
+		igt_fixture
+			recover(&priv);
+	}
+
+	igt_fixture
+		post_healthcheck(&priv);
+
+	igt_subtest_group {
+		igt_describe("Check if a device can be cleanly restored after hotunplug-lateclose");
+		igt_subtest("hotunplug-rescan")
+			hotunplug_rescan(&priv);
+
+		igt_fixture
+			recover(&priv);
+	}
+
+	igt_fixture
+		post_healthcheck(&priv);
+
+	igt_subtest_group {
+		igt_describe("Check if the driver hot unbound from a still open device can be cleanly rebound, then the old instance released");
+		igt_subtest("hotrebind-lateclose")
+			hotrebind_lateclose(&priv);
+
+		igt_fixture
+			recover(&priv);
+	}
+
+	igt_fixture
+		post_healthcheck(&priv);
+
+	igt_subtest_group {
+		igt_describe("Check if a still open while hot unplugged device can be cleanly restored, then the old instance released");
+		igt_subtest("hotreplug-lateclose")
+			hotreplug_lateclose(&priv);
+
+		igt_fixture
+			recover(&priv);
+	}
+
 	igt_fixture {
 		post_healthcheck(&priv);
 
-- 
2.21.1