[RFC PATCH i-g-t v2 2/8] tests/core_hotunplug: Use PCI device sysfs entry, not DRM

[Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>]

Future subtests may want to access PCI attributes of the device after
driver unbind.  Refactor prepare() helper.

v2: rebase on upstream

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>
---
 tests/core_hotunplug.c | 68 +++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 28 deletions(-)

diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
index 826645b1f..35eba9b8a 100644
--- a/tests/core_hotunplug.c
+++ b/tests/core_hotunplug.c
@@ -55,42 +55,54 @@ struct hotunplug {
 	igt_kmsg(KMSG_DEBUG "%s: %s: %s\n", igt_test_name(), __func__, msg); \
 })
 
-static void prepare_for_unbind(struct hotunplug *priv, char *buf, int buflen)
+static inline int prepare_common(struct hotunplug *priv)
 {
-	int len;
+	int fd_sysfs_drm;
+
+	local_debug("opening device");
+	priv->fd.drm = __drm_open_driver(DRIVER_ANY);
+	igt_assert(priv->fd.drm >= 0);
+
+	fd_sysfs_drm = igt_sysfs_open(priv->fd.drm);
+	igt_assert(fd_sysfs_drm >= 0);
+
+	return fd_sysfs_drm;
+}
+
+static inline void prepare_for_rebind(struct hotunplug *priv,
+				      char *buf, int buflen)
+{
+	int fd_sysfs_drm, len;
 
 	igt_assert(buflen);
 
-	priv->fd.sysfs_drv = openat(priv->fd.sysfs_dev, "device/driver",
-				    O_DIRECTORY);
-	igt_assert(priv->fd.sysfs_drv >= 0);
+	fd_sysfs_drm = prepare_common(priv);
+
+	priv->fd.sysfs_drv = openat(fd_sysfs_drm, "device/driver", O_DIRECTORY);
 
-	len = readlinkat(priv->fd.sysfs_dev, "device", buf, buflen - 1);
+	len = readlinkat(fd_sysfs_drm, "device", buf, buflen - 1);
 	buf[len] = '\0';
 	priv->dev_bus_addr = strrchr(buf, '/');
-	igt_assert(priv->dev_bus_addr++);
 
-	/* sysfs_dev no longer needed */
-	close(priv->fd.sysfs_dev);
+	close(fd_sysfs_drm);
+
+	igt_assert(priv->fd.sysfs_drv >= 0);
+	igt_assert(priv->dev_bus_addr++);
 }
 
-static inline void prepare(struct hotunplug *priv, char *buf, int buflen)
+static inline void prepare_for_rescan(struct hotunplug *priv)
 {
-	local_debug("opening device");
-	priv->fd.drm = __drm_open_driver(DRIVER_ANY);
-	igt_assert(priv->fd.drm >= 0);
+	int fd_sysfs_drm = prepare_common(priv);
 
-	priv->fd.sysfs_dev = igt_sysfs_open(priv->fd.drm);
-	igt_assert(priv->fd.sysfs_dev >= 0);
+	priv->fd.sysfs_dev = openat(fd_sysfs_drm, "device", O_DIRECTORY);
 
-	if (buf) {
-		prepare_for_unbind(priv, buf, buflen);
-	} else {
-		/* prepare for bus rescan */
-		priv->fd.sysfs_bus = openat(priv->fd.sysfs_dev,
-					    "device/subsystem", O_DIRECTORY);
-		igt_assert(priv->fd.sysfs_bus >= 0);
-	}
+	priv->fd.sysfs_bus = openat(fd_sysfs_drm, "device/subsystem",
+				    O_DIRECTORY);
+
+	close(fd_sysfs_drm);
+
+	igt_assert(priv->fd.sysfs_dev >= 0);
+	igt_assert(priv->fd.sysfs_bus >= 0);
 }
 
 static const char *failure;
@@ -124,7 +136,7 @@ static void device_unplug(int fd_sysfs_dev)
 {
 	failure = "Device unplug timeout!";
 	igt_set_timeout(60, failure);
-	igt_sysfs_set(fd_sysfs_dev, "device/remove", "1");
+	igt_sysfs_set(fd_sysfs_dev, "remove", "1");
 	igt_reset_timeout();
 	failure = NULL;
 
@@ -185,7 +197,7 @@ static void unbind_rebind(void)
 	struct hotunplug priv;
 	char buf[PATH_MAX];
 
-	prepare(&priv, buf, sizeof(buf));
+	prepare_for_rebind(&priv, buf, sizeof(buf));
 
 	local_debug("closing the device");
 	close(priv.fd.drm);
@@ -203,7 +215,7 @@ static void unplug_rescan(void)
 {
 	struct hotunplug priv;
 
-	prepare(&priv, NULL, 0);
+	prepare_for_rescan(&priv);
 
 	local_debug("closing the device");
 	close(priv.fd.drm);
@@ -222,7 +234,7 @@ static void hotunbind_lateclose(void)
 	struct hotunplug priv;
 	char buf[PATH_MAX];
 
-	prepare(&priv, buf, sizeof(buf));
+	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);
@@ -240,7 +252,7 @@ static void hotunplug_lateclose(void)
 {
 	struct hotunplug priv;
 
-	prepare(&priv, NULL, 0);
+	prepare_for_rescan(&priv);
 
 	local_debug("hot unplugging the device");
 	device_unplug(priv.fd.sysfs_dev);
-- 
2.21.1

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