[PATCH i-g-t 2/4] tests/core_hotunplug: Add unbind-unplug-rescan variant

[Janusz Krzysztofik]

Check if this 3-step procedure also triggers DMAR faults.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
 tests/core_hotunplug.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index 2192a1293..12084c333 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -204,6 +204,35 @@ static void unbind_rebind(void)
 	healthcheck();
 }
 
+static void unbind_unplug_rescan(void)
+{
+	struct hotunplug priv;
+	char buf[PATH_MAX];
+
+	/* prepare for unbind */
+	prepare_for_rebind(&priv, buf, sizeof(buf));
+
+	/* also prepare for unplug */
+	igt_debug("closing the device\n");
+	close(priv.fd.drm);
+	prepare_for_rescan(&priv);
+
+	igt_debug("closing the device\n");
+	close(priv.fd.drm);
+
+	igt_debug("unbinding the driver from the device\n");
+	driver_unbind(priv.fd.sysfs_drv, priv.dev_bus_addr);
+	close(priv.fd.sysfs_drv);
+
+	igt_debug("unplugging the device\n");
+	device_unplug(priv.fd.sysfs_dev);
+
+	igt_debug("recovering the device\n");
+	bus_rescan(priv.fd.sysfs_bus);
+
+	healthcheck();
+}
+
 static void unplug_rescan(void)
 {
 	struct hotunplug priv;
@@ -290,6 +319,13 @@ igt_main
 	igt_fixture
 		igt_abort_on_f(failure, "%s\n", failure);
 
+	igt_describe("Check if closed driver can be unbound cleanly, device removed then recovered by rescan");
+	igt_subtest("unbind-unplug-rescan")
+		unbind_unplug_rescan();
+
+	igt_fixture
+		igt_abort_on_f(failure, "%s\n", failure);
+
 	igt_describe("Check if a device believed to be closed can be cleanly unplugged");
 	igt_subtest("unplug-rescan")
 		unplug_rescan();
-- 
2.21.1