Message-ID: <ZxZ4cBilIlpf3IPw@p14s>
Date: Mon, 21 Oct 2024 09:51:12 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	op-tee@...ts.trustedfirmware.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v11 2/7] remoteproc: Add TEE support

On Wed, Oct 09, 2024 at 10:01:03AM +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@...s.st.com>
> ---
> Updates vs v9 revision:
> - remove unused trproc variable in tee_rproc_find_loaded_rsc_table(),
> - add check on trproc in tee_rproc_get_loaded_rsc_table()
> - move REMOTEPROC_TEE declaration just after REMOTEPROC_CDEV in Makefile
>   and Kconfig files
> - rename MAX_TEE_PARAM_ARRY_MEMBER to MAX_TEE_PARAM_ARRAY_MEMBER
> - rename tee_interface to rproc_tee_itf to better identify that it is
>   related to the remoteproc tee implementation,not to a platform
>   implementation such as Qualcomm.
> - print an error in tee_rproc_release_fw() instead of returning the error
>   No action can be done to fix get out from the release error.
> ---
>  drivers/remoteproc/Kconfig          |  10 +
>  drivers/remoteproc/Makefile         |   1 +
>  drivers/remoteproc/remoteproc_tee.c | 506 ++++++++++++++++++++++++++++
>  include/linux/remoteproc.h          |   4 +
>  include/linux/remoteproc_tee.h      | 107 ++++++
>  5 files changed, 628 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 955e4e38477e..d0284220a194 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -23,6 +23,16 @@ config REMOTEPROC_CDEV
>  
>  	  It's safe to say N if you don't want to use this interface.
>  
> +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.
> +
> +	  It's safe to say N if you don't want to use remoteproc TEE.
> +
>  config IMX_REMOTEPROC
>  	tristate "i.MX remoteproc support"
>  	depends on ARCH_MXC
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 5ff4e2fee4ab..f77e0abe8349 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -11,6 +11,7 @@ remoteproc-y				+= remoteproc_sysfs.o
>  remoteproc-y				+= remoteproc_virtio.o
>  remoteproc-y				+= remoteproc_elf_loader.o
>  obj-$(CONFIG_REMOTEPROC_CDEV)		+= remoteproc_cdev.o
> +obj-$(CONFIG_REMOTEPROC_TEE)		+= remoteproc_tee.o
>  obj-$(CONFIG_IMX_REMOTEPROC)		+= imx_rproc.o
>  obj-$(CONFIG_IMX_DSP_REMOTEPROC)	+= imx_dsp_rproc.o
>  obj-$(CONFIG_INGENIC_VPU_RPROC)		+= ingenic_rproc.o
> diff --git a/drivers/remoteproc/remoteproc_tee.c b/drivers/remoteproc/remoteproc_tee.c
> new file mode 100644
> index 000000000000..74d826792da8
> --- /dev/null
> +++ b/drivers/remoteproc/remoteproc_tee.c
> @@ -0,0 +1,506 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) STMicroelectronics 2024
> + * Author: Arnaud Pouliquen <arnaud.pouliquen@...s.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_ARRAY_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
> +
> +/*
> + * Release remote processor firmware images and associated resources.
> + * This command should be used in case an error occurs between the loading of
> + * the firmware images (A_RPROC_CMD_LOAD_FW) and the starting of the remote
> + * processor (TA_RPROC_CMD_START_FW) or after stopping the remote processor
> + * to release associated resources (TA_RPROC_CMD_STOP_FW).
> + *
> + * [in]  params[0].value.a: Unique 32-bit remote processor identifier
> + */
> +#define TA_RPROC_CMD_RELEASE_FW		6
> +
> +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_ARRAY_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,
> +	};
> +}
> +
> +void tee_rproc_release_fw(struct rproc *rproc)
> +{
> +	struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_rproc_itf;
> +	struct tee_ioctl_invoke_arg arg;
> +	int ret;
> +
> +	if (!rproc) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	/*
> +	 * If the remote processor state is RPROC_DETACHED, just ignore the
> +	 * request, as the remote processor is still running.
> +	 */
> +	if (rproc->state == RPROC_DETACHED)
> +		return;
> +
> +	if (rproc->state != RPROC_OFFLINE) {
> +		ret = -EBUSY;
> +		goto out;
> +	}
> +
> +	tee_rproc_prepare_args(trproc, TA_RPROC_CMD_RELEASE_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_RELEASE_FW invoke failed TEE err: %x, ret:%x\n",
> +			arg.ret, ret);
> +		ret = -EIO;
> +	}
> +
> +out:
> +	if (ret)
> +		/* Unexpected state without solution to come back in a stable state */
> +		dev_err(tee_rproc_ctx->dev, "Failed to release TEE remoteproc firmware: %d\n", ret);
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_release_fw);
> +
> +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> +	struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_rproc_itf;
> +	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_ARRAY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_rproc_itf;
> +	struct tee_ioctl_invoke_arg arg;
> +	int ret;
> +
> +	if (!trproc)
> +		return -EINVAL;
> +
> +	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;
> +
> +	if (!rproc)
> +		return -EINVAL;
> +
> +	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)
> +		goto release_fw;
> +
> +	/*
> +	 * 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);
> +		ret = -ENOMEM;
> +		goto release_fw;
> +	}
> +
> +	/*
> +	 * Create a copy of the resource table to have the same behavior as the ELF loader.
> +	 * This cached table will be used by the remoteproc core after the remoteproc stops
> +	 * to free resources and for crash recovery to reapply the settings.
> +	 * The cached table will be freed by the remoteproc core.
> +	 */
> +	rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz, GFP_KERNEL);
> +	iounmap(rsc_va);
> +
> +	if (!rproc->cached_table) {
> +		ret = -ENOMEM;
> +		goto release_fw;
> +	}
> +
> +	rproc->table_ptr = rproc->cached_table;
> +	rproc->table_sz = table_sz;
> +
> +	return 0;
> +
> +release_fw:
> +	tee_rproc_release_fw(rproc);
> +	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)
> +{
> +	phys_addr_t rsc_table;
> +	size_t table_sz;
> +	int ret;
> +
> +	ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
> +	if (ret)
> +		return NULL;
> +
> +	rproc->table_sz = table_sz;
> +	if (!table_sz)
> +		return NULL;
> +
> +	/*
> +	 * At this step the memory area that contains the resource table should have been registered
> +	 * by 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_ARRAY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_rproc_itf;
> +	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_ARRAY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_rproc_itf;
> +	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_ARRAY_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_rproc_itf = 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_rproc_itf = 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");

Please fix the above.

> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 8fd0d7f63c8e..73f640dd0fc0 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_rproc_itf: 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_rproc_itf;
>  };
>  
>  /**
> diff --git a/include/linux/remoteproc_tee.h b/include/linux/remoteproc_tee.h
> new file mode 100644
> index 000000000000..de559360890a
> --- /dev/null
> +++ b/include/linux/remoteproc_tee.h
> @@ -0,0 +1,107 @@
> +/* 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);
> +void tee_rproc_release_fw(struct rproc *rproc);
> +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 inline 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 void tee_rproc_release_fw(struct rproc *rproc)
> +{
> +	/* This shouldn't be possible */
> +	WARN_ON(1);
> +}
> +
> +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
> 

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