[PATCH i-g-t v6 13/23] tests/core_hotunplug: Let the driver time out essential sysfs operations

[Janusz Krzysztofik]

The test now arms a timer before performing each driver unbind / rebind
or device unplug / bus rescan sysfs operation.  Then in case of issues
we may prevent the driver from showing us if and how it can handle
them.

Don't arm the timer before sysfs operations which are essential for a
subtest.

v2: Refresh,
  - don't time out on hot driver rebind / hot device restore in
    *-lateclose variants, those operations haven't been covered by
    other subtests.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
 tests/core_hotunplug.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index 6af24862f..a502cf8fd 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -116,29 +116,31 @@ static void prepare(struct hotunplug *priv)
 }
 
 /* Unbind the driver from the device */
-static void driver_unbind(struct hotunplug *priv, const char *prefix)
+static void driver_unbind(struct hotunplug *priv, const char *prefix,
+			  int timeout)
 {
 	igt_debug("%sunbinding the driver from the device\n", prefix);
 	priv->failure = "Driver unbind failure!";
 
-	igt_set_timeout(60, "Driver unbind timeout!");
+	igt_set_timeout(timeout, "Driver unbind timeout!");
 	igt_sysfs_set(priv->fd.sysfs_drv, "unbind", priv->dev_bus_addr);
 	igt_reset_timeout();
 }
 
 /* Re-bind the driver to the device */
-static void driver_bind(struct hotunplug *priv)
+static void driver_bind(struct hotunplug *priv, int timeout)
 {
 	igt_debug("rebinding the driver to the device\n");
 	priv->failure = "Driver re-bind failure!";
 
-	igt_set_timeout(60, "Driver re-bind timeout!");
+	igt_set_timeout(timeout, "Driver re-bind timeout!");
 	igt_sysfs_set(priv->fd.sysfs_drv, "bind", priv->dev_bus_addr);
 	igt_reset_timeout();
 }
 
 /* Remove (virtually unplug) the device from its bus */
-static void device_unplug(struct hotunplug *priv, const char *prefix)
+static void device_unplug(struct hotunplug *priv, const char *prefix,
+			  int timeout)
 {
 	igt_require(priv->fd.sysfs_dev == -1);
 
@@ -149,7 +151,7 @@ static void device_unplug(struct hotunplug *priv, const char *prefix)
 	igt_debug("%sunplugging the device\n", prefix);
 	priv->failure = "Device unplug failure!";
 
-	igt_set_timeout(60, "Device unplug timeout!");
+	igt_set_timeout(timeout, "Device unplug timeout!");
 	igt_sysfs_set(priv->fd.sysfs_dev, "remove", "1");
 	igt_reset_timeout();
 
@@ -158,12 +160,12 @@ static void device_unplug(struct hotunplug *priv, const char *prefix)
 }
 
 /* Re-discover the device by rescanning its bus */
-static void bus_rescan(struct hotunplug *priv)
+static void bus_rescan(struct hotunplug *priv, int timeout)
 {
 	igt_debug("rediscovering the device\n");
 	priv->failure = "Bus rescan failure!";
 
-	igt_set_timeout(60, "Bus rescan timeout!");
+	igt_set_timeout(timeout, "Bus rescan timeout!");
 	igt_sysfs_set(priv->fd.sysfs_bus, "../rescan", "1");
 	igt_reset_timeout();
 }
@@ -210,10 +212,10 @@ static void recover(struct hotunplug *priv)
 	cleanup(priv);
 
 	if (faccessat(priv->fd.sysfs_bus, priv->dev_bus_addr, F_OK, 0))
-		bus_rescan(priv);
+		bus_rescan(priv, 60);
 
 	else if (faccessat(priv->fd.sysfs_drv, priv->dev_bus_addr, F_OK, 0))
-		driver_bind(priv);
+		driver_bind(priv, 60);
 
 	if (priv->failure)
 		healthcheck(priv);
@@ -248,9 +250,9 @@ static void unbind_rebind(struct hotunplug *priv)
 {
 	igt_assert_eq(priv->fd.drm, -1);
 
-	driver_unbind(priv, "");
+	driver_unbind(priv, "", 0);
 
-	driver_bind(priv);
+	driver_bind(priv, 0);
 
 	healthcheck(priv);
 }
@@ -259,9 +261,9 @@ static void unplug_rescan(struct hotunplug *priv)
 {
 	igt_assert_eq(priv->fd.drm, -1);
 
-	device_unplug(priv, "");
+	device_unplug(priv, "", 0);
 
-	bus_rescan(priv);
+	bus_rescan(priv, 0);
 
 	healthcheck(priv);
 }
@@ -271,9 +273,9 @@ static void hotunbind_lateclose(struct hotunplug *priv)
 	igt_assert_eq(priv->fd.drm, -1);
 	priv->fd.drm = local_drm_open_driver("", " for hotunbind");
 
-	driver_unbind(priv, "hot ");
+	driver_unbind(priv, "hot ", 0);
 
-	driver_bind(priv);
+	driver_bind(priv, 0);
 
 	igt_debug("late closing the unbound device instance\n");
 	priv->fd.drm = close_device(priv->fd.drm);
@@ -287,9 +289,9 @@ static void hotunplug_lateclose(struct hotunplug *priv)
 	igt_assert_eq(priv->fd.drm, -1);
 	priv->fd.drm = local_drm_open_driver("", " for hotunplug");
 
-	device_unplug(priv, "hot ");
+	device_unplug(priv, "hot ", 0);
 
-	bus_rescan(priv);
+	bus_rescan(priv, 0);
 
 	igt_debug("late closing the removed device instance\n");
 	priv->fd.drm = close_device(priv->fd.drm);
-- 
2.21.1