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[2620:137:e000::1:20]) by mx.google.com with ESMTP id n12-20020a170903110c00b001ae8c269c76si6163950plh.638.2023.05.23.02.16.24; Tue, 23 May 2023 02:16:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@foss.st.com header.s=selector1 header.b="rmL/vSM3"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=foss.st.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236369AbjEWJPY (ORCPT + 99 others); Tue, 23 May 2023 05:15:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236445AbjEWJPK (ORCPT ); Tue, 23 May 2023 05:15:10 -0400 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21BA9E77; Tue, 23 May 2023 02:14:40 -0700 (PDT) Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34N9A9xt017511; Tue, 23 May 2023 11:14:17 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=selector1; bh=UkxS9YGdEc2txWpj0vOF2WYEwr3eimtCXXnFy6470Ts=; b=rmL/vSM3IBJeViMovuXfZ4Pni/q4/Demta44eQID5iI8Tou/27LaB7ED9YvDLKib612U dOejf4vtUUIGjEKC42W5vUsC0YhoHEQiHbqvSxdEG8lXkTOS3jGQyLvRxW3nEKB7tcuD E+8r3bHUF+b2tggex84IoTyjPxRIhWs2NuWGtKKwHI6AgJ4ZmZleAwUM3uKmdbUjK2zE ELqiTWjka+yt1/x8TMiapoSdzp0kGnU76Ouwv+vnUgR5nu+Q0Ag7t86xXO/4i4pJdKwC 3Ag9spf78uLrD7s00Zg9WnW7Zu7pLHBNI488XoaSGvTsh1uq1KyKcXsqL1maKJ5rTMb5 ww== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3qrspngg32-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 23 May 2023 11:14:17 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 58658100038; Tue, 23 May 2023 11:14:16 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 498E0222CBC; Tue, 23 May 2023 11:14:16 +0200 (CEST) Received: from localhost (10.252.31.43) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Tue, 23 May 2023 11:14:16 +0200 From: Arnaud Pouliquen To: Bjorn Andersson , Mathieu Poirier , Jens Wiklander CC: , , , , , Arnaud Pouliquen Subject: [RFC PATCH 2/4] remoteproc: Add TEE support Date: Tue, 23 May 2023 11:13:48 +0200 Message-ID: <20230523091350.292221-3-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230523091350.292221-1-arnaud.pouliquen@foss.st.com> References: <20230523091350.292221-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.252.31.43] X-ClientProxiedBy: EQNCAS1NODE4.st.com (10.75.129.82) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-23_06,2023-05-22_03,2023-05-22_02 X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766675864696717568?= X-GMAIL-MSGID: =?utf-8?q?1766675864696717568?= Add a remoteproc TEE (Trusted Execution Environment) device driver that will be probed by the TEE bus. If the associated TEE Trusted application is supported, this device offers a client interface to load a signed firmware in the secure context. An implementation of a trusted application is available the Arm TrustZone, in OP-TEE. Signed-off-by: Arnaud Pouliquen --- drivers/remoteproc/Kconfig | 8 + drivers/remoteproc/Makefile | 1 + drivers/remoteproc/tee_remoteproc.c | 397 ++++++++++++++++++++++++++++ include/linux/tee_remoteproc.h | 101 +++++++ 4 files changed, 507 insertions(+) create mode 100644 drivers/remoteproc/tee_remoteproc.c create mode 100644 include/linux/tee_remoteproc.h diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index a850e9f486dd..2969f067e3c3 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -365,6 +365,14 @@ config XLNX_R5_REMOTEPROC It's safe to say N if not interested in using RPU r5f cores. +config TEE_REMOTEPROC + tristate "trusted firmware support by a trusted application" + depends on OPTEE + help + Support for signed remote processors firmware management. The firmware + authentication is managed by a trusted application. + This can be either built-in or a loadable module. + endif # REMOTEPROC endmenu diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile index 91314a9b43ce..fa8daebce277 100644 --- a/drivers/remoteproc/Makefile +++ b/drivers/remoteproc/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_RCAR_REMOTEPROC) += rcar_rproc.o obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o +obj-$(CONFIG_TEE_REMOTEPROC) += tee_remoteproc.o obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o diff --git a/drivers/remoteproc/tee_remoteproc.c b/drivers/remoteproc/tee_remoteproc.c new file mode 100644 index 000000000000..ba5831af0f42 --- /dev/null +++ b/drivers/remoteproc/tee_remoteproc.c @@ -0,0 +1,397 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 STMicroelectronics - All Rights Reserved + * Authors: Arnaud Pouliquen + */ + +#include +#include +#include +#include +#include +#include + +#include "remoteproc_internal.h" + +#define MAX_TEE_PARAM_ARRY_MEMB 4 + +/* + * Authentication of the firmware and load in the remote processor memory + * + * [in] params[0].value.a: unique 32bit identifier of the firmware + * [in] params[1].memref: buffer containing the image of the buffer + */ +#define TA_RPROC_CMD_LOAD_FW 1 + +/* + * start the remote processor + * + * [in] params[0].value.a: unique 32bit identifier of the firmware + */ +#define TA_RPROC_CMD_START_FW 2 + +/* + * stop the remote processor + * + * [in] params[0].value.a: unique 32bit identifier of the firmware + */ +#define TA_RPROC_CMD_STOP_FW 3 + +/* + * return the address of the resource table, or 0 if not found + * No check is done to verify that the address returned is accessible by + * the non secure context. If the resource table is loaded in a protected + * memory the access by the non secure context will lead to a data abort. + * + * [in] params[0].value.a: unique 32bit identifier of the firmware + * [out] params[1].value.a: 32bit LSB resource table memory address + * [out] params[1].value.b: 32bit MSB resource table memory address + * [out] params[2].value.a: 32bit LSB resource table memory size + * [out] params[2].value.b: 32bit MSB resource table memory size + */ +#define TA_RPROC_CMD_GET_RSC_TABLE 4 + +/* + * return the address of the core dump + * + * [in] params[0].value.a: unique 32bit identifier of the firmware + * [out] params[1].memref: address of the core dump image if exist, + * else return Null + */ +#define TA_RPROC_CMD_GET_COREDUMP 5 + +struct tee_rproc_mem { + char name[20]; + void __iomem *cpu_addr; + phys_addr_t bus_addr; + u32 dev_addr; + size_t size; +}; + +struct tee_rproc_context { + struct list_head sessions; + struct tee_context *tee_ctx; + struct device *dev; +}; + +struct tee_rproc_context *tee_rproc_ctx; + +static void prepare_args(struct tee_rproc *trproc, int cmd, struct tee_ioctl_invoke_arg *arg, + struct tee_param *param, unsigned int num_params) +{ + memset(arg, 0, sizeof(*arg)); + memset(param, 0, MAX_TEE_PARAM_ARRY_MEMB * sizeof(*param)); + + arg->func = cmd; + arg->session = trproc->session_id; + arg->num_params = num_params + 1; + + param[0] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + .u.value.a = trproc->fw_id, + }; +} + +int tee_rproc_load_fw(struct tee_rproc *trproc, const struct firmware *fw) +{ + struct tee_ioctl_invoke_arg arg; + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB]; + struct tee_shm *fw_shm; + int ret; + + fw_shm = tee_shm_register_kernel_buf(tee_rproc_ctx->tee_ctx, (void *)fw->data, fw->size); + if (IS_ERR(fw_shm)) { + /* Fallback: Try to allocate memory in OP-TEE space */ + fw_shm = tee_shm_alloc_kernel_buf(tee_rproc_ctx->tee_ctx, fw->size); + if (IS_ERR(fw_shm)) + return PTR_ERR(fw_shm); + + memcpy(tee_shm_get_va(fw_shm, 0), fw->data, fw->size); + } + + prepare_args(trproc, TA_RPROC_CMD_LOAD_FW, &arg, param, 1); + + /* provide the address of the firmware image */ + param[1] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT, + .u.memref = { + .shm = fw_shm, + .size = fw->size, + .shm_offs = 0, + }, + }; + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_CMD_LOAD_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + ret = -EIO; + } + + tee_shm_free(fw_shm); + + return ret; +} +EXPORT_SYMBOL(tee_rproc_load_fw); + +int rproc_tee_get_rsc_table(struct tee_rproc *trproc) +{ + struct tee_ioctl_invoke_arg arg; + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB]; + struct rproc *rproc = trproc->rproc; + size_t rsc_size; + int ret; + + prepare_args(trproc, TA_RPROC_CMD_GET_RSC_TABLE, &arg, param, 2); + + param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + return -EIO; + } + + rsc_size = param[2].u.value.a; + + /* + * Store the resource table address that would be updated by the remote + * core and the virtio. + */ + trproc->rsc_va = ioremap_wc(param[1].u.value.a, rsc_size); + if (IS_ERR_OR_NULL(trproc->rsc_va)) { + dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n", + param[1].u.value.a, rsc_size); + trproc->rsc_va = NULL; + return -ENOMEM; + } + + /* + * A cached table is requested as the physical address is not mapped yet + * but remoteproc need to parse the table for resources. + */ + rproc->cached_table = kmemdup(trproc->rsc_va, rsc_size, GFP_KERNEL); + if (!rproc->cached_table) + return -ENOMEM; + + rproc->table_ptr = rproc->cached_table; + rproc->table_sz = rsc_size; + + return 0; +} +EXPORT_SYMBOL(rproc_tee_get_rsc_table); + +struct resource_table *tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc) +{ + return (struct resource_table *)trproc->rsc_va; +} +EXPORT_SYMBOL(tee_rproc_get_loaded_rsc_table); + +int tee_rproc_start(struct tee_rproc *trproc) +{ + struct tee_ioctl_invoke_arg arg; + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB]; + int ret; + + prepare_args(trproc, TA_RPROC_CMD_START_FW, &arg, param, 0); + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_CMD_START_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + ret = -EIO; + } + + return ret; +} +EXPORT_SYMBOL(tee_rproc_start); + +int tee_rproc_stop(struct tee_rproc *trproc) +{ + struct tee_ioctl_invoke_arg arg; + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB]; + int ret; + + prepare_args(trproc, TA_RPROC_CMD_STOP_FW, &arg, param, 0); + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + ret = -EIO; + } + if (trproc->rsc_va) + iounmap(trproc->rsc_va); + trproc->rsc_va = NULL; + + return ret; +} +EXPORT_SYMBOL(tee_rproc_stop); + +static const struct tee_client_device_id stm32_tee_fw_id_table[] = { + {UUID_INIT(0x80a4c275, 0x0a47, 0x4905, + 0x82, 0x85, 0x14, 0x86, 0xa9, 0x77, 0x1a, 0x08)}, + {} +}; + +struct tee_rproc *tee_rproc_register(struct device *dev, unsigned int fw_id) +{ + struct tee_client_device *rproc_tee_device; + struct tee_ioctl_open_session_arg sess_arg; + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB]; + struct tee_rproc *trproc; + int ret; + + /* + * The device is not probed by the TEE bus. We ignore the reason ( bus could be not yet + * probed or service nt available in the secure firmware) + * Assumption here is that the TEE bus is not probed. + */ + if (!tee_rproc_ctx) + return ERR_PTR(-EPROBE_DEFER); + + trproc = devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL); + if (!trproc) + return ERR_PTR(-ENOMEM); + + rproc_tee_device = to_tee_client_device(tee_rproc_ctx->dev); + memset(&sess_arg, 0, sizeof(sess_arg)); + + /* Open session with rproc_tee load Trusted App */ + memcpy(sess_arg.uuid, rproc_tee_device->id.uuid.b, TEE_IOCTL_UUID_LEN); + + /* + * TODO: should we replace TEE_IOCTL_LOGIN_PUBLIC by + * TEE_IOCTL_LOGIN_REE_KERNEL? + */ + sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL; + sess_arg.num_params = 1; + + param[0] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + .u.value.a = fw_id, + }; + + ret = tee_client_open_session(tee_rproc_ctx->tee_ctx, &sess_arg, param); + if (ret < 0 || sess_arg.ret != 0) { + dev_err(dev, "tee_client_open_session failed, err: %x\n", sess_arg.ret); + return ERR_PTR(-EINVAL); + } + + trproc->parent = dev; + trproc->fw_id = fw_id; + trproc->session_id = sess_arg.session; + + list_add_tail(&trproc->node, &tee_rproc_ctx->sessions); + + return trproc; +} +EXPORT_SYMBOL(tee_rproc_register); + +int tee_rproc_unregister(struct tee_rproc *trproc) +{ + int ret; + + if (!tee_rproc_ctx) + return -ENODEV; + + ret = tee_client_close_session(tee_rproc_ctx->tee_ctx, trproc->session_id); + if (ret < 0) + dev_err(trproc->parent, "tee_client_close_session failed, err: %x\n", ret); + + list_del(&trproc->node); + + return ret; +} +EXPORT_SYMBOL(tee_rproc_unregister); + +static int tee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) +{ + /* Today we support only the OP-TEE, could be extend to other tees */ + return (ver->impl_id == TEE_IMPL_ID_OPTEE); +} + +static int tee_rproc_probe(struct device *dev) +{ + struct tee_context *tee_ctx; + int ret; + + /* Only one RPROC OP-TEE device allowed */ + if (tee_rproc_ctx) { + dev_err(dev, "An RPROC OP-TEE device was already initialized: only one allowed\n"); + return -EBUSY; + } + + /* Open context with TEE driver */ + tee_ctx = tee_client_open_context(NULL, tee_ctx_match, NULL, NULL); + if (IS_ERR(tee_ctx)) + return PTR_ERR(tee_ctx); + + tee_rproc_ctx = devm_kzalloc(dev, sizeof(*tee_ctx), GFP_KERNEL); + if (!tee_ctx) { + ret = -ENOMEM; + goto err; + } + + tee_rproc_ctx->dev = dev; + tee_rproc_ctx->tee_ctx = tee_ctx; + INIT_LIST_HEAD(&tee_rproc_ctx->sessions); + + return 0; +err: + tee_client_close_context(tee_ctx); + + return ret; +} + +static int tee_rproc_remove(struct device *dev) +{ + struct tee_rproc *entry, *tmp; + + list_for_each_entry_safe(entry, tmp, &tee_rproc_ctx->sessions, node) { + tee_client_close_session(tee_rproc_ctx->tee_ctx, entry->session_id); + list_del(&entry->node); + kfree(entry); + } + + tee_client_close_context(tee_rproc_ctx->tee_ctx); + + return 0; +} + +MODULE_DEVICE_TABLE(tee, stm32_tee_fw_id_table); + +static struct tee_client_driver tee_rproc_fw_driver = { + .id_table = stm32_tee_fw_id_table, + .driver = { + .name = KBUILD_MODNAME, + .bus = &tee_bus_type, + .probe = tee_rproc_probe, + .remove = tee_rproc_remove, + }, +}; + +static int __init tee_rproc_fw_mod_init(void) +{ + return driver_register(&tee_rproc_fw_driver.driver); +} + +static void __exit tee_rproc_fw_mod_exit(void) +{ + driver_unregister(&tee_rproc_fw_driver.driver); +} + +module_init(tee_rproc_fw_mod_init); +module_exit(tee_rproc_fw_mod_exit); + +MODULE_DESCRIPTION("secure remote processor control driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/tee_remoteproc.h b/include/linux/tee_remoteproc.h new file mode 100644 index 000000000000..a9e7327f2308 --- /dev/null +++ b/include/linux/tee_remoteproc.h @@ -0,0 +1,101 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 STMicroelectronics - All Rights Reserved + */ + +#ifndef TEE_REMOTEPROC_H +#define TEE_REMOTEPROC_H + +#include +#include + +/** + * struct tee_rproc - TEE remoteproc structure + * @node: Reference in list + * @rproc: Remoteproc reference + * @parent: Parent device + * @fw_id: Identifier of the target firmware + * @session_id: TEE session identifier + * @rsc_va: Resource table virtual address. + */ +struct tee_rproc { + struct list_head node; + + struct rproc *rproc; + struct device *parent; + u32 fw_id; + u32 session_id; + void *rsc_va; +}; + +#if IS_ENABLED(CONFIG_TEE_REMOTEPROC) + +struct tee_rproc *tee_rproc_register(struct device *dev, unsigned int fw_id); +int tee_rproc_unregister(struct tee_rproc *trproc); + +int tee_rproc_load_fw(struct tee_rproc *trproc, const struct firmware *fw); +int rproc_tee_get_rsc_table(struct tee_rproc *trproc); +struct resource_table *tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc); +int tee_rproc_start(struct tee_rproc *trproc); +int tee_rproc_stop(struct tee_rproc *trproc); + +#else + +static inline struct tee_rproc *tee_rproc_register(struct device *dev, + unsigned int fw_id) +{ + return ERR_PTR(-ENODEV); +} + +static inline int tee_rproc_unregister(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_load_fw(struct tee_rproc *trproc, + const struct firmware *fw) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_start(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_stop(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int rproc_tee_get_rsc_table(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline struct resource_table * + tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return NULL; +} + +#endif /* CONFIG_TEE_REMOTEPROC */ +#endif /* TEE_REMOTEPROC_H */