[RFC PATCH i-g-t v2 4/8] tests/core_hotunplug: Add 'lateclose before recover' variants

[Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>]

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.  Let's rename
those variants to more adequate hotrebind/hotreplug-lateclose and add
new variants focused on exercising the lateclose phase regardless of
potential rebind/re-plug issues under old names.

v2: rebase on upstream

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>
---
 tests/core_hotunplug.c | 57 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 3 deletions(-)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index a4809720b..0892e1927 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -268,6 +268,43 @@ static void hotunbind_lateclose(void)
 	local_debug("hot unbinding the driver from the device");
 	driver_unbind(priv.fd.sysfs_drv, priv.dev_bus_addr);
 
+	local_debug("late closing the unbound device instance");
+	close(priv.fd.drm);
+
+	local_debug("rebinding the driver to the device");
+	driver_bind(priv.fd.sysfs_drv, priv.dev_bus_addr);
+
+	healthcheck();
+}
+
+static void hotunplug_lateclose(void)
+{
+	struct hotunplug priv;
+
+	prepare_for_rescan(&priv);
+
+	local_debug("hot unplugging the device");
+	device_unplug(priv.fd.sysfs_dev);
+
+	local_debug("late closing the removed device instance");
+	close(priv.fd.drm);
+
+	local_debug("recovering the device");
+	bus_rescan(priv.fd.sysfs_bus);
+
+	healthcheck();
+}
+
+static void hotrebind_lateclose(void)
+{
+	struct hotunplug priv;
+	char buf[PATH_MAX];
+
+	prepare_for_rebind(&priv, buf, sizeof(buf));
+
+	local_debug("hot unbinding the driver from the device");
+	driver_unbind(priv.fd.sysfs_drv, priv.dev_bus_addr);
+
 	local_debug("rebinding the driver to the device");
 	driver_bind(priv.fd.sysfs_drv, priv.dev_bus_addr);
 
@@ -277,7 +314,7 @@ static void hotunbind_lateclose(void)
 	healthcheck();
 }
 
-static void hotunplug_lateclose(void)
+static void hotreplug_lateclose(void)
 {
 	struct hotunplug priv;
 
@@ -340,17 +377,31 @@ igt_main
 	igt_fixture
 		igt_abort_on_f(failure, "%s\n", failure);
 
-	igt_describe("Check if the driver can be cleanly unbound from a still open device, then released");
+	igt_describe("Check if the driver can be cleanly unbound from a still open device, then released and rebound");
 	igt_subtest("hotunbind-lateclose")
 		hotunbind_lateclose();
 
 	igt_fixture
 		igt_abort_on_f(failure, "%s\n", failure);
 
-	igt_describe("Check if a still open device can be cleanly unplugged, then released");
+	igt_describe("Check if a still open device can be cleanly unplugged, then released and recovered");
 	igt_subtest("hotunplug-lateclose")
 		hotunplug_lateclose();
 
 	igt_fixture
 		igt_abort_on_f(failure, "%s\n", failure);
+
+	igt_describe("Check if the driver can be cleanly unbound from an open device and rebound back, then released");
+	igt_subtest("hotrebind-lateclose")
+		hotrebind_lateclose();
+
+	igt_fixture
+		igt_abort_on_f(failure, "%s\n", failure);
+
+	igt_describe("Check if a still open device can be cleanly unplugged and recovered, then released");
+	igt_subtest("hotreplug-lateclose")
+		hotreplug_lateclose();
+
+	igt_fixture
+		igt_abort_on_f(failure, "%s\n", failure);
 }
-- 
2.21.1

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