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.c

@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#include <unit/io.h>
+#include <unit/unit.h>
+
+#include <include/nvgpu/posix/io.h>
+#include <nvgpu/types.h>
+#include <nvgpu/io.h>
+
+#include "common_io.h"
+
+#define USER_MODE_BASE (0x00810000U)
+#define NVGPU_READ_VAL (0xD007U)
+
+static void readl_access_reg_fn(struct gk20a *g,
+	struct nvgpu_reg_access *access)
+{
+	access->value = NVGPU_READ_VAL;
+}
+
+static void writel_access_reg_fn(struct gk20a *g,
+	struct nvgpu_reg_access *access)
+{
+
+}
+
+static struct nvgpu_posix_io_callbacks ut_common_io_reg_callbacks = {
+	.readl         = readl_access_reg_fn,
+	.writel          = writel_access_reg_fn,
+};
+
+int test_writel_check(struct unit_module *m, struct gk20a *g, void *args)
+{
+	nvgpu_posix_io_init_reg_space(g);
+	nvgpu_posix_register_io(g, &ut_common_io_reg_callbacks);
+
+	/* Value 0 will force to fail readback call as read API returns
+	 * NVGPU_READ_VAL. */
+	nvgpu_writel_check(g, USER_MODE_BASE, 0);
+
+	/* Value NVGPU_READ_VAL will pass the readback call as read API returns
+	 * NVGPU_READ_VAL. */
+	nvgpu_writel_check(g, USER_MODE_BASE, NVGPU_READ_VAL);
+
+	return UNIT_SUCCESS;
+}
+
+struct unit_module_test io_tests[] = {
+	UNIT_TEST(writel_check, test_writel_check, NULL, 0),
+};
+
+UNIT_MODULE(io, io_tests, UNIT_PRIO_NVGPU_TEST);