[PATCH 5/5] hwspinlock: Add test module

[Benjamin Gaignard]

Create a test module to perform simple unitary tests on hwspinlock.
It doesn't cover all the possibles cases but at least allow to test
that very basic features are working.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxx>
---
 drivers/hwspinlock/Kconfig           |   9 +++
 drivers/hwspinlock/Makefile          |   1 +
 drivers/hwspinlock/hwspinlock_test.c | 132 +++++++++++++++++++++++++++++++++++
 3 files changed, 142 insertions(+)
 create mode 100644 drivers/hwspinlock/hwspinlock_test.c

diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
index e1a20b460590..f340ebb4d1f7 100644
--- a/drivers/hwspinlock/Kconfig
+++ b/drivers/hwspinlock/Kconfig
@@ -68,3 +68,12 @@ config HWSPINLOCK_STM32
 	  Say y here to support the STM32 Hardware Spinlock device.
 
 	  If unsure, say N.
+
+config HWSPINLOCK_TEST
+	tristate "hwspinlock test module"
+	depends on HWSPINLOCK && m
+	default n
+	help
+	  Select M here if you want to build hwspinlock test module
+
+	  If unsure, say N.
diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile
index c0a9505b4dcf..e6b3d0212fe0 100644
--- a/drivers/hwspinlock/Makefile
+++ b/drivers/hwspinlock/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_HWSPINLOCK_SIRF)		+= sirf_hwspinlock.o
 obj-$(CONFIG_HWSPINLOCK_SPRD)		+= sprd_hwspinlock.o
 obj-$(CONFIG_HSEM_U8500)		+= u8500_hsem.o
 obj-$(CONFIG_HWSPINLOCK_STM32)		+= stm32_hwspinlock.o
+obj-$(CONFIG_HWSPINLOCK_TEST) 		+= hwspinlock_test.o
diff --git a/drivers/hwspinlock/hwspinlock_test.c b/drivers/hwspinlock/hwspinlock_test.c
new file mode 100644
index 000000000000..75819337e45a
--- /dev/null
+++ b/drivers/hwspinlock/hwspinlock_test.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics SA 2018
+ * Author: Benjamin Gaignard <benjamin.gaignard@xxxxxx> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/hwspinlock.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define TIMEOUT	50 /* ms */
+
+static void hwspin_lock_test_twice_request_specific(void)
+{
+	struct hwspinlock *lock0 = hwspin_lock_request_specific(0);
+	struct hwspinlock *lock1 = hwspin_lock_request_specific(1);
+
+	int ret;
+
+	if (!lock0 || !lock1) {
+		pr_warn("Can't request twice hwspin_lock\n");
+		return;
+	}
+
+	ret = hwspin_trylock(lock0);
+	if (ret)
+		pr_warn("Can't trylock requested hwspin_lock 0 (%d)\n", ret);
+
+	ret = hwspin_trylock(lock1);
+	if (ret)
+		pr_warn("Can't trylock requested hwspin_lock 1 (%d)\n", ret);
+
+	hwspin_unlock(lock0);
+	hwspin_unlock(lock1);
+
+	ret = hwspin_lock_free(lock0);
+	if (ret)
+		pr_warn("Can't free requested hwspin_lock 0\n");
+
+	ret = hwspin_lock_free(lock1);
+	if (ret)
+		pr_warn("Can't free requested hwspin_lock 0\n");
+}
+
+static void hwspin_lock_test_trylock(void)
+{
+	struct hwspinlock *lock = hwspin_lock_request();
+	int ret;
+
+	if (!lock) {
+		pr_warn("Can't request hwspin_lock\n");
+		return;
+	}
+
+	ret = hwspin_trylock(lock);
+	if (ret)
+		pr_warn("Can't trylock requested hwspin_lock (%d)\n", ret);
+
+	/* Try to lock a second time, this should failed */
+	ret = hwspin_trylock(lock);
+	if (ret != -EBUSY)
+		pr_warn("Getting twice the same lock ! (%d)\n", ret);
+
+	hwspin_unlock(lock);
+	ret = hwspin_lock_free(lock);
+	if (ret)
+		pr_warn("Can't free requested hwspin_lock 0\n");
+}
+
+static void hwspin_lock_test_request_specific(void)
+{
+	/*
+	 * Let's assume that any hwspin_lock driver would at least have one
+	 * lock at index 0
+	 */
+	struct hwspinlock *lock = hwspin_lock_request_specific(0);
+	int ret;
+
+	if (!lock) {
+		pr_warn("Can't request hwspin_lock 0\n");
+		return;
+	}
+
+	ret = hwspin_lock_timeout(lock, TIMEOUT);
+	if (ret)
+		pr_warn("Can't lock requested hwspin_lock 0 (%d)\n", ret);
+
+	hwspin_unlock(lock);
+	ret = hwspin_lock_free(lock);
+	if (ret)
+		pr_warn("Can't free requested hwspin_lock 0\n");
+}
+
+static void hwspin_lock_test_request(void)
+{
+	struct hwspinlock *lock = hwspin_lock_request();
+	int ret;
+
+	if (!lock) {
+		pr_warn("Can't request hwspin_lock\n");
+		return;
+	}
+
+	ret = hwspin_lock_timeout(lock, TIMEOUT);
+	if (ret)
+		pr_warn("Can't lock requested hwspin_lock (%d)\n", ret);
+
+	hwspin_unlock(lock);
+	ret = hwspin_lock_free(lock);
+	if (ret)
+		pr_warn("Can't free requested hwspin_lock\n");
+}
+
+/*
+ * Test hwspinlock user API when module is loaded
+ */
+static int __init hwspin_lock_test_init(void)
+{
+	pr_warn("Loading hwspinlock test module\n");
+	hwspin_lock_test_request();
+	hwspin_lock_test_request_specific();
+	hwspin_lock_test_trylock();
+	hwspin_lock_test_twice_request_specific();
+
+	return 0;
+}
+
+module_init(hwspin_lock_test_init);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Hardware spinlock test driver");
-- 
2.15.0