drivers: misc: Add nvsciipc kernel module

This patch adds nvsciipc kernel driver. At present its only use is to
support NvSciIpc secure buffer sharing use case across processes.

JIRA ESLC-4105

Change-Id: Ib2889d7c0c7a3928ad1e84c8dd58f3aa287c6185
Signed-off-by: Abhijit <abhijit@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2146877
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: Sandeep Trasi <strasi@nvidia.com>
Reviewed-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

include/linux/nvsciipc_interface.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef __NVSCIIPC_INTERFACE_H__
+#define __NVSCIIPC_INTERFACE_H__
+
+/** Invalid VUID definition */
+#define NVSCIIPC_ENDPOINT_VUID_INVALID      0U
+/** Invalid authentication token definition */
+#define NVSCIIPC_ENDPOINT_AUTHTOKEN_INVALID 0U
+/** current self SOC ID */
+#define NVSCIIPC_SELF_SOCID 0xFFFFFFFFU
+/** current self VM ID */
+#define NVSCIIPC_SELF_VMID  0xFFFFFFFFU
+
+/**
+ * @brief Handle to the IPC endpoint.
+ */
+typedef uint64_t NvSciIpcEndpoint;
+
+
+/**
+ * @brief VUID(VM unique ID) of the IPC endpoint.
+ */
+typedef uint64_t NvSciIpcEndpointVuid;
+
+/**
+ * @brief authentication token of the IPC endpoint.
+ */
+typedef uint64_t NvSciIpcEndpointAuthToken;
+
+/**
+ * @brief Defines topology ID of the IPC endpoint.
+ */
+typedef struct {
+	/*! Holds SOC ID */
+	uint32_t SocId;
+	/*! Holds VMID */
+	uint32_t VmId;
+} NvSciIpcTopoId;
+
+/**********************************************************************/
+/*********************** Function Definitions *************************/
+/**********************************************************************/
+NvSciError NvSciIpcEndpointGetAuthToken(NvSciIpcEndpoint handle,
+		NvSciIpcEndpointAuthToken *authToken);
+
+NvSciError NvSciIpcEndpointValidateAuthTokenLinuxCurrent(
+		NvSciIpcEndpointAuthToken authToken,
+		NvSciIpcEndpointVuid *localUserVuid);
+
+NvSciError NvSciIpcEndpointMapVuid(NvSciIpcEndpointVuid localUserVuid,
+		NvSciIpcTopoId *peerTopoId, NvSciIpcEndpointVuid *peerUserVuid);
+
+NvSciError NvSciIpcEndpointGetVuid(NvSciIpcEndpoint handle,
+		NvSciIpcEndpointVuid *vuid);
+
+#endif /* __NVSCIIPC_INTERFACE_H__ */