gpu: nvgpu: unit: SWUTS for interface.lock

Add SWUTS documentation for the interface.lock unit.

JIRA NVGPU-3943

Change-Id: I705755482ee98217dc5015a42fea6f13ba852a61
Signed-off-by: Nicolas Benech <nbenech@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2207311
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

userspace/units/interface/lock/lock.c

@@ -32,9 +32,7 @@
 #include <pthread.h>
 #include <semaphore.h>
 
-#define TYPE_MUTEX		0
-#define TYPE_SPINLOCK		1
-#define TYPE_RAW_SPINLOCK	2
+#include "lock.h"
 
 /* Parameter structure to pass to worker threads */
 struct worker_parameters {
@@ -47,11 +45,7 @@ struct worker_parameters {
 sem_t worker_sem;
 bool test_shared_flag;
 
-/*
- * Simple test to check mutex init routine
- */
-static int test_mutex_init(struct unit_module *m, struct gk20a *g,
-					void *args)
+int test_mutex_init(struct unit_module *m, struct gk20a *g, void *args)
 {
 	struct nvgpu_mutex mutex;
 
@@ -61,11 +55,7 @@ static int test_mutex_init(struct unit_module *m, struct gk20a *g,
 	return UNIT_SUCCESS;
 }
 
-/*
- * Test to verify the behavior of mutex tryacquire function.
- */
-static int test_mutex_tryacquire(struct unit_module *m, struct gk20a *g,
-					void *args)
+int test_mutex_tryacquire(struct unit_module *m, struct gk20a *g, void *args)
 {
 	struct nvgpu_mutex mutex;
 	int status;
@@ -154,7 +144,7 @@ static void *lock_worker(void *args)
  * release functions.
  * The "args" argument is an int indicating the lock type.
  */
-static int test_lock_acquire_release(struct unit_module *m, struct gk20a *g,
+int test_lock_acquire_release(struct unit_module *m, struct gk20a *g,
 					void *args)
 {
 	struct nvgpu_mutex mutex;

userspace/units/interface/lock/lock.h

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef UNIT_LOCK_H
+#define UNIT_LOCK_H
+
+struct gk20a;
+struct unit_module;
+
+/** @addtogroup SWUTS-interface-lock
+ *  @{
+ *
+ * Software Unit Test Specification for interface.lock
+ */
+
+/**
+ * \name Lock Types
+ * There are 3 types of locks supported by this unit test, defined as below.
+ */
+/** @{ */
+#define TYPE_MUTEX		0
+#define TYPE_SPINLOCK		1
+#define TYPE_RAW_SPINLOCK	2
+/** @} */
+
+/**
+ * Test specification for: test_mutex_init
+ *
+ * Description: Simple test to check mutex init routine.
+ *
+ * Test Type: Feature
+ *
+ * Input: None
+ *
+ * Steps:
+ * - Initialize a mutex via the nvgpu_mutex_init function.
+ * - Destroy the mutex via the nvgpu_mutex_destroy function.
+ *
+ * Output: Returns PASS if the steps above were executed successfully. FAIL
+ * otherwise.
+ */
+int test_mutex_init(struct unit_module *m, struct gk20a *g, void *args);
+
+/**
+ * Test specification for: test_mutex_tryacquire
+ *
+ * Description: Test to verify the behavior of mutex tryacquire function.
+ *
+ * Test Type: Feature
+ *
+ * Input: None
+ *
+ * Steps:
+ * - Initialize a mutex via the nvgpu_mutex_init function.
+ * - Acquire the mutex.
+ * - Perform a nvgpu_mutex_tryacquire on the mutex and ensure that the operation
+ *   returned a failure code.
+ * - Release the mutex.
+ * - Perform a nvgpu_mutex_tryacquire again and ensure that the operation
+ *   succeeded.
+ * - Release and destroy the mutex.
+ *
+ * Output: Returns PASS if the steps above were executed successfully. FAIL
+ * otherwise.
+ */
+int test_mutex_tryacquire(struct unit_module *m, struct gk20a *g, void *args);
+
+/**
+ * Test specification for: test_lock_acquire_release
+ *
+ * Description: Test to verify the behavior of mutex, regular and raw spinlocks
+ * acquire and release functions. For this purpose, there are 2 threads
+ * involved: the regular main thread, and a worker thread.
+ *
+ * Test Type: Feature
+ *
+ * Input: @param args [in] Type of lock as defined by TYPE_* macros.
+ *
+ * Steps:
+ * - Initialize the lock using the corresponding init function.
+ * - Create a semaphore \a worker_sem and set the \a test_shared_flag to false.
+ * - Acquire the lock using its corresponding acquire function.
+ * - Create the worker thread and wait for it to signal that it is ready thanks
+ *   to the \a worker_sem.
+ * - The worker thread then blocks trying to acquire the lock.
+ * - The main thread then releases the lock and wait for a signal from the
+ *   worker thread via \a worker_sem.
+ * - The worker thread should now be able to acquire the lock and update the
+ *   \a test_shared_flag.
+ * - The main thread ensures that the \a test_shared_flag was updated.
+ * - Release and destroy the lock and the worker thread.
+ *
+ * Output: Returns PASS if the steps above were executed successfully. FAIL
+ * otherwise.
+ */
+int test_lock_acquire_release(struct unit_module *m, struct gk20a *g,
+					void *args);
+
+/** }@ */
+#endif /* UNIT_LOCK_H */