gpu: nvgpu: unit test for common-io

This patch covers unit test for nvgpu_writel_check().

Jira NVGPU-4810

Change-Id: I173afd59a9e8fe9e647f260a70012f2c7c2d02f9
Signed-off-by: Prateek sethi <prsethi@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2293538
Reviewed-by: Rajesh Devaraj <rdevaraj@nvidia.com>
Reviewed-by: Ankur Kishore <ankkishore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

userspace/units/io/common_io.h

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2020, 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.
+ */
+
+/**
+ * @addtogroup SWUTS-io
+ * @{
+ *
+ * Software Unit Test Specification for common_io
+ */
+
+#ifndef __UNIT_COMMON_IO_H__
+#define __UNIT_COMMON_IO_H__
+
+/**
+ * Test specification for test_writel_check
+ *
+ * Description: Write value v to reg and read it back.
+ *
+ * Test Type: Feature
+ *
+ * Targets: nvgpu_writel_check
+ *
+ * Inputs: None
+ *
+ * Steps:
+ * Initialize address space and register io callbacks.
+ * Call nvgpu_writel_check with value 0. Here read and write value will be
+ * different as read callback always returns NVGPU_READ_VAL.
+ * Call nvgpu_writel_check with value NVGPU_READ_VAL. Here read and write value
+ * will be same as read callback always returns NVGPU_READ_VAL.
+ *
+ * Output:
+ * The test returns PASS only as target nvgpu_writel_check() always returns
+ * void.
+ *
+ */
+int test_writel_check(struct unit_module *m, struct gk20a *g, void *args);
+
+#endif /* __UNIT_COMMON_IO_H__ */