[Intel-gfx] [RFC PATCH i-g-t v2 7/8] tests/core_hotunplug: Add 'PRIME handle' variant

[Janusz Krzysztofik]

Even if all device file descriptors are closed on device hotunplug,
PRIME exported objects may still exists, referenced by still open
dma-buf file handles.  Add a subtest that keeps such handle open on
device hotunplug.

v2: rebase on upstream

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 c30d98a69..7cb699cc2 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -379,6 +379,35 @@ static void gem_hotunplug_lateclose(void)
 	healthcheck();
 }
 
+static void prime_hotunplug_lateclose(void)
+{
+	struct hotunplug priv;
+	uint32_t handle;
+	int dmabuf;
+
+	prepare_for_rescan(&priv);
+
+	igt_require_gem(priv.fd.drm);
+
+	local_debug("creating and PRIME-exporting a GEM object");
+	handle = gem_create(priv.fd.drm, 4096);
+	dmabuf = prime_handle_to_fd(priv.fd.drm, handle);
+
+	local_debug("closing the device");
+	close(priv.fd.drm);
+
+	local_debug("hot unplugging the device");
+	device_unplug(priv.fd.sysfs_dev);
+
+	local_debug("late closing the PRIME file handle");
+	close(dmabuf);
+
+	local_debug("recovering the device");
+	bus_rescan(priv.fd.sysfs_bus);
+
+	healthcheck();
+}
+
 /* Main */
 
 igt_main
@@ -465,4 +494,11 @@ igt_main
 
 	igt_fixture
 		igt_abort_on_f(failure, "%s\n", failure);
+
+	igt_describe("Check if a device with a still open PRIME-exported object can be cleanly unplugged, then released and recovered");
+	igt_subtest("prime-hotunplug-lateclose")
+		prime_hotunplug_lateclose();
+
+	igt_fixture
+		igt_abort_on_f(failure, "%s\n", failure);
 }
-- 
2.21.1