Re: [PATCH v8 2/5] remoteproc: Add TEE support

Mathieu Poirier
2024-07-02T16:44:15Z

Good morning,

On Fri, Jun 21, 2024 at 04:37:56PM +0200, Arnaud Pouliquen wrote:
> Add a remoteproc TEE (Trusted Execution Environment) driver
> that will be probed by the TEE bus. If the associated Trusted
> application is supported on secure part this driver offers a client
> interface to load a firmware by the secure part.
> This firmware could be authenticated by the secure trusted application.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
> ---
> Updates vs previous version:
> - rename tee_remoteproc.* file to rmeoteproc_tee.*,
> - rename TEE_REMOTEPROC config to REMOTEPROC_TEE,
> - remove "stm32" in some variable declarations,
> - remove useless "remoteproc_internal.h" include,
> - fix tee_rproc_ctx devm_kzalloc.
> - rework module description
> ---
> drivers/remoteproc/Kconfig | 10 +
> drivers/remoteproc/Makefile | 1 +
> drivers/remoteproc/remoteproc_tee.c | 446 ++++++++++++++++++++++++++++
> include/linux/remoteproc.h | 4 +
> include/linux/remoteproc_tee.h | 100 +++++++
> 5 files changed, 561 insertions(+)
> create mode 100644 drivers/remoteproc/remoteproc_tee.c
> create mode 100644 include/linux/remoteproc_tee.h
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 48845dc8fa85..278f197acb90 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -365,6 +365,16 @@ config XLNX_R5_REMOTEPROC
>
> It's safe to say N if not interested in using RPU r5f cores.
>
> +
> +config REMOTEPROC_TEE
> + tristate "Remoteproc support by a TEE application"
> + depends on OPTEE
> + help
> + Support a remote processor with a TEE application. The Trusted
> + Execution Context is responsible for loading the trusted firmware
> + image and managing the remote processor's lifecycle.
> + 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..b4eb37177005 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-$(CONFIG_REMOTEPROC_TEE) += remoteproc_tee.o
> obj-$(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/remoteproc_tee.c b/drivers/remoteproc/remoteproc_tee.c
> new file mode 100644
> index 000000000000..70cb67451767
> --- /dev/null
> +++ b/drivers/remoteproc/remoteproc_tee.c
> @@ -0,0 +1,446 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) STMicroelectronics 2024
> + * Author: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/remoteproc.h>
> +#include <linux/remoteproc_tee.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +
> +#define MAX_TEE_PARAM_ARRY_MEMBER 4
> +
> +/*
> + * Authentication of the firmware and load in the remote processor memory
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + * [in] params[1].memref: buffer containing the image of the buffer
> + */
> +#define TA_RPROC_FW_CMD_LOAD_FW 1
> +
> +/*
> + * Start the remote processor
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + */
> +#define TA_RPROC_FW_CMD_START_FW 2
> +
> +/*
> + * Stop the remote processor
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + */
> +#define TA_RPROC_FW_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 remote processor
> + * [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_FW_CMD_GET_RSC_TABLE 4
> +
> +/*
> + * Return the address of the core dump
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + * [out] params[1].memref: address of the core dump image if exist,
> + * else return Null
> + */
> +#define TA_RPROC_FW_CMD_GET_COREDUMP 5
> +
> +struct tee_rproc_context {
> + struct list_head sessions;
> + struct tee_context *tee_ctx;
> + struct device *dev;
> +};
> +
> +static struct tee_rproc_context *tee_rproc_ctx;
> +
> +static void tee_rproc_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_MEMBER * 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->rproc_id,
> + };
> +}
> +
> +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + struct tee_shm *fw_shm;
> + int ret;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + fw_shm = tee_shm_register_kernel_buf(tee_rproc_ctx->tee_ctx, (void *)fw->data, fw->size);
> + if (IS_ERR(fw_shm))
> + return PTR_ERR(fw_shm);
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_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_FW_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_GPL(tee_rproc_load_fw);
> +
> +static int tee_rproc_get_loaded_rsc_table(struct rproc *rproc, phys_addr_t *rsc_pa,
> + size_t *table_sz)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret;
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_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_FW_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + return -EIO;
> + }
> +
> + *table_sz = param[2].u.value.a;
> +
> + if (*table_sz)
> + *rsc_pa = param[1].u.value.a;
> + else
> + *rsc_pa = 0;
> +
> + return 0;
> +}
> +
> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + phys_addr_t rsc_table;
> + void __iomem *rsc_va;
> + size_t table_sz;
> + int ret;
> +
> + ret = tee_rproc_load_fw(rproc, fw);
> + if (ret)
> + return ret;
> +
> + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
> + if (ret)
> + return ret;

Do we need an API to unload the firware from memory too? If anything fails we
still have firmware loaded into memory.

More comments to come later.

Mathieu

> +
> + /*
> + * We assume here that the memory mapping is the same between the TEE and Linux kernel
> + * contexts. Else a new TEE remoteproc service could be needed to get a copy of the
> + * resource table
> + */
> + rsc_va = ioremap_wc(rsc_table, table_sz);
> + if (IS_ERR_OR_NULL(rsc_va)) {
> + dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %pa+%zx\n",
> + &rsc_table, table_sz);
> + return -ENOMEM;
> + }
> +
> + /*
> + * Create a copy of the resource table to have the same behavior as the elf loader.
> + * This cached table will be used after the remoteproc stops to free resources, and for
> + * crash recovery to reapply the settings.
> + */
> + rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz, GFP_KERNEL);
> + if (!rproc->cached_table) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + rproc->table_ptr = rproc->cached_table;
> + rproc->table_sz = table_sz;
> +
> +out:
> + iounmap(rsc_va);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_parse_fw);
> +
> +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
> + const struct firmware *fw)
> +{
> + struct tee_rproc *trproc = rproc->tee_interface;
> + phys_addr_t rsc_table;
> + size_t table_sz;
> + int ret;
> +
> + if (!trproc)
> + return ERR_PTR(-EINVAL);
> +
> + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + rproc->table_sz = table_sz;
> + if (!table_sz)
> + return NULL;
> +
> + /*
> + * At this step the memory area that contains the resource table should have be declared
> + * in the remote proc platform driver and allocated by rproc_alloc_registered_carveouts().
> + */
> + return (struct resource_table *)rproc_pa_to_va(rproc, rsc_table, table_sz, NULL);
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
> +
> +int tee_rproc_start(struct rproc *rproc)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret = 0;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_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_FW_CMD_START_FW invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + if (!ret)
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_start);
> +
> +int tee_rproc_stop(struct rproc *rproc)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_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_FW_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + if (!ret)
> + ret = -EIO;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
> +
> +static const struct tee_client_device_id tee_rproc_id_table[] = {
> + {UUID_INIT(0x80a4c275, 0x0a47, 0x4905, 0x82, 0x85, 0x14, 0x86, 0xa9, 0x77, 0x1a, 0x08)},
> + {}
> +};
> +
> +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, unsigned int rproc_id)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_ioctl_open_session_arg sess_arg;
> + struct tee_client_device *tee_device;
> + struct tee_rproc *trproc, *p_err;
> + int ret;
> +
> + /*
> + * Test if the device has been probed by the TEE bus. In case of failure, we ignore the
> + * reason. The bus could be not yet probed or the service not available in the secure
> + * firmware.The assumption in such a case is that the TEE remoteproc is not probed.
> + */
> + if (!tee_rproc_ctx)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + /* Prevent tee rproc module from being removed */
> + if (!try_module_get(THIS_MODULE)) {
> + dev_err(tee_rproc_ctx->dev, "can't get owner\n");
> + return ERR_PTR(-ENODEV);
> + }
> +
> + trproc = devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
> + if (!trproc) {
> + p_err = ERR_PTR(-ENOMEM);
> + goto module_put;
> + }
> + tee_device = to_tee_client_device(tee_rproc_ctx->dev);
> + memset(&sess_arg, 0, sizeof(sess_arg));
> +
> + memcpy(sess_arg.uuid, tee_device->id.uuid.b, TEE_IOCTL_UUID_LEN);
> +
> + 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 = rproc_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);
> + p_err = ERR_PTR(-EINVAL);
> + goto module_put;
> + }
> +
> + trproc->parent = dev;
> + trproc->rproc_id = rproc_id;
> + trproc->session_id = sess_arg.session;
> +
> + trproc->rproc = rproc;
> + rproc->tee_interface = trproc;
> +
> + list_add_tail(&trproc->node, &tee_rproc_ctx->sessions);
> +
> + return trproc;
> +
> +module_put:
> + module_put(THIS_MODULE);
> + return p_err;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_register);
> +
> +int tee_rproc_unregister(struct tee_rproc *trproc)
> +{
> + struct rproc *rproc = trproc->rproc;
> + int ret;
> +
> + 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);
> + rproc->tee_interface = NULL;
> +
> + module_put(THIS_MODULE);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_unregister);
> +
> +static int tee_rproc_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;
> +
> + /* Open context with TEE driver */
> + tee_ctx = tee_client_open_context(NULL, tee_rproc_ctx_match, NULL, NULL);
> + if (IS_ERR(tee_ctx))
> + return PTR_ERR(tee_ctx);
> +
> + tee_rproc_ctx = devm_kzalloc(dev, sizeof(*tee_rproc_ctx), GFP_KERNEL);
> + if (!tee_rproc_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, tee_rproc_id_table);
> +
> +static struct tee_client_driver tee_rproc_fw_driver = {
> + .id_table = tee_rproc_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(" remote processor support with a TEE application");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 8fd0d7f63c8e..fbe1d6793709 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -503,6 +503,8 @@ enum rproc_features {
> RPROC_MAX_FEATURES,
> };
>
> +struct tee_rproc;
> +
> /**
> * struct rproc - represents a physical remote processor device
> * @node: list node of this rproc object
> @@ -545,6 +547,7 @@ enum rproc_features {
> * @cdev: character device of the rproc
> * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
> * @features: indicate remoteproc features
> + * @tee_interface: pointer to the remoteproc tee context
> */
> struct rproc {
> struct list_head node;
> @@ -586,6 +589,7 @@ struct rproc {
> struct cdev cdev;
> bool cdev_put_on_release;
> DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
> + struct tee_rproc *tee_interface;
> };
>
> /**
> diff --git a/include/linux/remoteproc_tee.h b/include/linux/remoteproc_tee.h
> new file mode 100644
> index 000000000000..ccf34a218d54
> --- /dev/null
> +++ b/include/linux/remoteproc_tee.h
> @@ -0,0 +1,100 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright(c) 2024 STMicroelectronics
> + */
> +
> +#ifndef REMOTEPROC_TEE_H
> +#define REMOTEPROC_TEE_H
> +
> +#include <linux/tee_drv.h>
> +#include <linux/firmware.h>
> +#include <linux/remoteproc.h>
> +
> +struct rproc;
> +
> +/**
> + * struct tee_rproc - TEE remoteproc structure
> + * @node: Reference in list
> + * @rproc: Remoteproc reference
> + * @parent: Parent device
> + * @rproc_id: Identifier of the target firmware
> + * @session_id: TEE session identifier
> + */
> +struct tee_rproc {
> + struct list_head node;
> + struct rproc *rproc;
> + struct device *parent;
> + u32 rproc_id;
> + u32 session_id;
> +};
> +
> +#if IS_REACHABLE(CONFIG_REMOTEPROC_TEE)
> +
> +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
> + unsigned int rproc_id);
> +int tee_rproc_unregister(struct tee_rproc *trproc);
> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw);
> +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw);
> +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
> + const struct firmware *fw);
> +int tee_rproc_start(struct rproc *rproc);
> +int tee_rproc_stop(struct rproc *rproc);
> +
> +#else
> +
> +static inline struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
> + unsigned int rproc_id)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> +static int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +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 rproc *rproc, const struct firmware *fw)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_start(struct rproc *rproc)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_stop(struct rproc *rproc)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline struct resource_table *
> +tee_rproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return NULL;
> +}
> +#endif /* CONFIG_REMOTEPROC_TEE */
> +#endif /* REMOTEPROC_TEE_H */
> --
> 2.25.1
>