From 150beca33511dce72f33020f47615c1c7adbb8d1 Mon Sep 17 00:00:00 2001
From: Manish Bhardwaj <mbhardwaj@nvidia.com>
Date: Sat, 21 Sep 2024 10:07:27 +0000
Subject: [PATCH] nvidia-oot: tegra_hv: add dummy driver support

For some of the kernel tegra_hv is part of core kernel and
hence it is nto required to use the OOT tegra_hv driver.

However, some packaging still expect the tegra_hv.ko from
the OOT path. To trick the packaging file, add dummy tegra_hv
driver which does not have anything other than module_init/module_exit.

Bug 4551265

Change-Id: I59f6233705e2cfb510470ae3b9c1ce7d39618330
Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3197802
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
---
 configs/Makefile.config.oot         |  1 +
 drivers/virt/tegra/Makefile         |  5 +++++
 drivers/virt/tegra/tegra_hv_dummy.c | 21 +++++++++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 drivers/virt/tegra/tegra_hv_dummy.c

diff --git a/configs/Makefile.config.oot b/configs/Makefile.config.oot
index a8817404..cf1f42ad 100644
--- a/configs/Makefile.config.oot
+++ b/configs/Makefile.config.oot
@@ -4,3 +4,4 @@
 # Kernel OOT specific environment variables to configure the OOT modules
 
 export NV_OOT_IVC_EXT_SKIP_BUILD=y
+export NV_OOT_TEGRA_HV_SKIP_BUILD=y
diff --git a/drivers/virt/tegra/Makefile b/drivers/virt/tegra/Makefile
index 2a0db74e..3a5f3c42 100644
--- a/drivers/virt/tegra/Makefile
+++ b/drivers/virt/tegra/Makefile
@@ -5,7 +5,12 @@
 # Makefile for Hypervisor interface
 #
 ifdef CONFIG_TEGRA_VIRTUALIZATION
+ifneq ($(NV_OOT_TEGRA_HV_SKIP_BUILD),y)
 obj-m		+= tegra_hv.o
+else
+obj-m		+= tegra_hv.o
+tegra_hv-objs := tegra_hv_dummy.o
+endif
 endif
 obj-m		+= tegra_hv_pm_ctl.o
 obj-m		+= hvc_sysfs.o
diff --git a/drivers/virt/tegra/tegra_hv_dummy.c b/drivers/virt/tegra/tegra_hv_dummy.c
new file mode 100644
index 00000000..24e00d1b
--- /dev/null
+++ b/drivers/virt/tegra/tegra_hv_dummy.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/module.h>
+
+static int __init tegra_hv_dummy_init(void)
+{
+	pr_info("Inserting dummy tegra_hv.ko module");
+	return 0;
+}
+module_init(tegra_hv_dummy_init);
+
+static void __exit tegra_hv_dummy_exit(void)
+{
+	pr_info("Removing dummy tegra_hv.ko module");
+}
+module_exit(tegra_hv_dummy_exit);
+
+MODULE_AUTHOR("Manish Bhardwaj <mbhardwaj@nvidia.com>");
+MODULE_DESCRIPTION("Tegra HV Dummy Driver");
+MODULE_LICENSE("GPL v2");