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Subject[PATCH 5/5] hwspinlock: Add test module
Date
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@st.com>
---
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@st.com> 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
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