[v4,1/4] remoteproc: Add TEE support

Commit Message

Arnaud POULIQUEN March 8, 2024, 2:47 p.m. UTC

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 device offers a client
interface to load a firmware in the secure part.
This firmware could be authenticated by the secure trusted application.

Signed-off-by: Arnaud Pouliquen <[e-mail]>
---
Updates from V3:
- rework TEE_REMOTEPROC description in Kconfig
- fix some namings
- add tee_rproc_parse_fw  to support rproc_ops::parse_fw
- add proc::tee_interface;
- add rproc struct as parameter of the tee_rproc_register() function
---
 drivers/remoteproc/Kconfig          |  10 +
 drivers/remoteproc/Makefile         |   1 +
 drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
 include/linux/remoteproc.h          |   4 +
 include/linux/tee_remoteproc.h      | 112 +++++++
 5 files changed, 561 insertions(+)
 create mode 100644 drivers/remoteproc/tee_remoteproc.c
 create mode 100644 include/linux/tee_remoteproc.h

Comments

kernel test robot March 10, 2024, 3:18 a.m. UTC | #1

Hi Arnaud,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 62210f7509e13a2caa7b080722a45229b8f17a0a]

url:    https://github.com/intel-lab-lkp/linux/commits/Arnaud-Pouliquen/remoteproc-Add-TEE-support/20240308-225116
base:   62210f7509e13a2caa7b080722a45229b8f17a0a
patch link:    https://lore.kernel.org/r/20240308144708.62362-2-arnaud.pouliquen%40foss.st.com
patch subject: [PATCH v4 1/4] remoteproc: Add TEE support
config: arm-randconfig-r123-20240310 (https://download.01.org/0day-ci/archive/20240310/[e-mail]/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240310/[e-mail]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[e-mail]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/

sparse warnings: (new ones prefixed by >>)
>> drivers/remoteproc/tee_remoteproc.c:163:19: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct resource_table *rsc_table @@     got void [noderef] __iomem * @@
   drivers/remoteproc/tee_remoteproc.c:163:19: sparse:     expected struct resource_table *rsc_table
   drivers/remoteproc/tee_remoteproc.c:163:19: sparse:     got void [noderef] __iomem *
>> drivers/remoteproc/tee_remoteproc.c:276:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem *io_addr @@     got struct resource_table *rsc_table @@
   drivers/remoteproc/tee_remoteproc.c:276:23: sparse:     expected void volatile [noderef] __iomem *io_addr
   drivers/remoteproc/tee_remoteproc.c:276:23: sparse:     got struct resource_table *rsc_table
   drivers/remoteproc/tee_remoteproc.c:399:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem *io_addr @@     got struct resource_table *rsc_table @@
   drivers/remoteproc/tee_remoteproc.c:399:38: sparse:     expected void volatile [noderef] __iomem *io_addr
   drivers/remoteproc/tee_remoteproc.c:399:38: sparse:     got struct resource_table *rsc_table
   drivers/remoteproc/tee_remoteproc.c: note: in included file (through arch/arm/include/asm/traps.h, arch/arm/include/asm/thread_info.h, include/linux/thread_info.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +163 drivers/remoteproc/tee_remoteproc.c

   131	
   132	struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
   133	{
   134		struct tee_ioctl_invoke_arg arg;
   135		struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
   136		struct tee_rproc *trproc = rproc->tee_interface;
   137		struct resource_table *rsc_table;
   138		int ret;
   139	
   140		if (!trproc)
   141			return ERR_PTR(-EINVAL);
   142	
   143		tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_GET_RSC_TABLE, &arg, param, 2);
   144	
   145		param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
   146		param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
   147	
   148		ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
   149		if (ret < 0 || arg.ret != 0) {
   150			dev_err(tee_rproc_ctx->dev,
   151				"TA_RPROC_FW_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\n",
   152				arg.ret, ret);
   153			return ERR_PTR(-EIO);
   154		}
   155	
   156		*table_sz = param[2].u.value.a;
   157	
   158		/* If the size is null no resource table defined in the image */
   159		if (!*table_sz)
   160			return NULL;
   161	
   162		/* Store the resource table address that would be updated by the remote core. */
 > 163		rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
   164		if (IS_ERR_OR_NULL(rsc_table)) {
   165			dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
   166				param[1].u.value.a, *table_sz);
   167			return ERR_PTR(-ENOMEM);
   168		}
   169	
   170		return rsc_table;
   171	}
   172	EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
   173	
   174	int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
   175	{
   176		struct tee_rproc *trproc = rproc->tee_interface;
   177		struct resource_table *rsc_table;
   178		size_t table_sz;
   179		int ret;
   180	
   181		ret = tee_rproc_load_fw(rproc, fw);
   182		if (ret)
   183			return ret;
   184	
   185		rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
   186		if (IS_ERR(rsc_table))
   187			return PTR_ERR(rsc_table);
   188	
   189		/* Create a copy of the resource table to have same behaviour than the elf loader. */
   190		rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
   191		if (!rproc->cached_table)
   192			return -ENOMEM;
   193	
   194		rproc->table_ptr = rproc->cached_table;
   195		rproc->table_sz = table_sz;
   196		trproc->rsc_table = rsc_table;
   197	
   198		return 0;
   199	}
   200	EXPORT_SYMBOL_GPL(tee_rproc_parse_fw);
   201	
   202	struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
   203							       const struct firmware *fw)
   204	{
   205		struct tee_rproc *trproc = rproc->tee_interface;
   206		struct resource_table *rsc_table;
   207		size_t table_sz;
   208	
   209		if (!trproc)
   210			return ERR_PTR(-EINVAL);
   211	
   212		/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
   213		if (trproc->rsc_table)
   214			return trproc->rsc_table;
   215	
   216		rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
   217		if (IS_ERR(rsc_table))
   218			return rsc_table;
   219	
   220		rproc->table_sz = table_sz;
   221		trproc->rsc_table = rsc_table;
   222	
   223		return rsc_table;
   224	}
   225	EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
   226	
   227	int tee_rproc_start(struct rproc *rproc)
   228	{
   229		struct tee_ioctl_invoke_arg arg;
   230		struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
   231		struct tee_rproc *trproc = rproc->tee_interface;
   232		int ret;
   233	
   234		if (!trproc)
   235			return -EINVAL;
   236	
   237		tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_START_FW, &arg, param, 0);
   238	
   239		ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
   240		if (ret < 0 || arg.ret != 0) {
   241			dev_err(tee_rproc_ctx->dev,
   242				"TA_RPROC_FW_CMD_START_FW invoke failed TEE err: %x, ret:%x\n",
   243				arg.ret, ret);
   244			if (!ret)
   245				ret = -EIO;
   246		}
   247	
   248		return ret;
   249	}
   250	EXPORT_SYMBOL_GPL(tee_rproc_start);
   251	
   252	int tee_rproc_stop(struct rproc *rproc)
   253	{
   254		struct tee_ioctl_invoke_arg arg;
   255		struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
   256		struct tee_rproc *trproc = rproc->tee_interface;
   257		int ret;
   258	
   259		if (!trproc)
   260			return -EINVAL;
   261	
   262		tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_STOP_FW, &arg, param, 0);
   263	
   264		ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
   265		if (ret < 0 || arg.ret != 0) {
   266			dev_err(tee_rproc_ctx->dev,
   267				"TA_RPROC_FW_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n",
   268				arg.ret, ret);
   269			if (!ret)
   270				ret = -EIO;
   271		}
   272	
   273		if (!rproc->table_ptr)
   274			return ret;
   275	
 > 276		iounmap(trproc->rsc_table);
   277		trproc->rsc_table = NULL;
   278		rproc->table_ptr = NULL;
   279	
   280		return 0;
   281	}
   282	EXPORT_SYMBOL_GPL(tee_rproc_stop);
   283

Mathieu Poirier March 25, 2024, 4:46 p.m. UTC | #2

On Fri, Mar 08, 2024 at 03:47:05PM +0100, 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 device offers a client

Device or driver?  I thought I touched on that before.

> interface to load a firmware in the secure part.
> This firmware could be authenticated by the secure trusted application.
> 
> Signed-off-by: Arnaud Pouliquen <[e-mail]>
> ---
> Updates from V3:
> - rework TEE_REMOTEPROC description in Kconfig
> - fix some namings
> - add tee_rproc_parse_fw  to support rproc_ops::parse_fw
> - add proc::tee_interface;
> - add rproc struct as parameter of the tee_rproc_register() function
> ---
>  drivers/remoteproc/Kconfig          |  10 +
>  drivers/remoteproc/Makefile         |   1 +
>  drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
>  include/linux/remoteproc.h          |   4 +
>  include/linux/tee_remoteproc.h      | 112 +++++++
>  5 files changed, 561 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 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
> +	tristate "remoteproc support by a TEE application"

s/remoteproc/Remoteproc

> +	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..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..c855210e52e3
> --- /dev/null
> +++ b/drivers/remoteproc/tee_remoteproc.c
> @@ -0,0 +1,434 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
> + * Author: Arnaud Pouliquen <[e-mail]>
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/remoteproc.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include <linux/tee_remoteproc.h>
> +
> +#include "remoteproc_internal.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_ioctl_invoke_arg arg;
> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_interface;
> +	struct tee_shm *fw_shm;
> +	int ret;

Declarations in reverse ascending order here and everywhere in the driver.
Sometimes it is done properly, sometimes it isn't. 

> +
> +	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);
> +
> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> +{
> +	struct tee_ioctl_invoke_arg arg;
> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_interface;
> +	struct resource_table *rsc_table;
> +	int ret;
> +
> +	if (!trproc)
> +		return ERR_PTR(-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 ERR_PTR(-EIO);
> +	}
> +
> +	*table_sz = param[2].u.value.a;
> +
> +	/* If the size is null no resource table defined in the image */
> +	if (!*table_sz)
> +		return NULL;
> +
> +	/* Store the resource table address that would be updated by the remote core. */
> +	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
> +	if (IS_ERR_OR_NULL(rsc_table)) {
> +		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
> +			param[1].u.value.a, *table_sz);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	return rsc_table;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
> +
> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> +	struct tee_rproc *trproc = rproc->tee_interface;
> +	struct resource_table *rsc_table;
> +	size_t table_sz;
> +	int ret;
> +
> +	ret = tee_rproc_load_fw(rproc, fw);
> +	if (ret)
> +		return ret;
> +
> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> +	if (IS_ERR(rsc_table))
> +		return PTR_ERR(rsc_table);
> +
> +	/* Create a copy of the resource table to have same behaviour than the elf loader. */
> +	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
> +	if (!rproc->cached_table)
> +		return -ENOMEM;

Why not ->table_ptr and setting ->cached_table to NULL?

> +
> +	rproc->table_ptr = rproc->cached_table;
> +	rproc->table_sz = table_sz;
> +	trproc->rsc_table = rsc_table;

I really don't see why this is needed, please remove and use rproc->table_ptr
instead.

> +
> +	return 0;
> +}
> +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;
> +	struct resource_table *rsc_table;
> +	size_t table_sz;
> +
> +	if (!trproc)
> +		return ERR_PTR(-EINVAL);
> +
> +	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
> +	if (trproc->rsc_table)
> +		return trproc->rsc_table;

Again, why not simply use rproc->rsc_table?  This function should only return
the resource table that was set in tee_rproc_parse_fw(). 

> +
> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> +	if (IS_ERR(rsc_table))
> +		return rsc_table;
> +
> +	rproc->table_sz = table_sz;
> +	trproc->rsc_table = rsc_table;
> +
> +	return rsc_table;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
> +
> +int tee_rproc_start(struct rproc *rproc)
> +{
> +	struct tee_ioctl_invoke_arg arg;
> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_interface;
> +	int ret;
> +
> +	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)
> +			ret = -EIO;
> +	}
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_start);
> +
> +int tee_rproc_stop(struct rproc *rproc)
> +{
> +	struct tee_ioctl_invoke_arg arg;
> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> +	struct tee_rproc *trproc = rproc->tee_interface;
> +	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;
> +	}
> +
> +	if (!rproc->table_ptr)
> +		return ret;
> +
> +	iounmap(trproc->rsc_table);
> +	trproc->rsc_table = NULL;
> +	rproc->table_ptr = NULL;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
> +
> +static const struct tee_client_device_id stm32_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_client_device *tee_device;
> +	struct tee_ioctl_open_session_arg sess_arg;
> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> +	struct tee_rproc *trproc;
> +	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);
> +
> +	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
> +	if (!trproc)
> +		return ERR_PTR(-ENOMEM);
> +
> +	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);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	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;

Once this function was called by a client, what prevents a user from unloading
the tee_remoteproc module and breaking everything?

> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_register);
> +
> +int tee_rproc_unregister(struct tee_rproc *trproc)
> +{

If you pass a struct_rproc instead of a struct tee_rproc there is no need for
tee_rproc::rproc, which is only ever used in this function.


> +	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;
> +
> +	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_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);
> +		if (entry->rsc_table)
> +			iounmap(entry->rsc_table);
> +		kfree(entry);
> +	}
> +
> +	tee_client_close_context(tee_rproc_ctx->tee_ctx);
> +
> +	return 0;
> +}
> +
> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
> +
> +static struct tee_client_driver tee_rproc_fw_driver = {
> +	.id_table	= stm32_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(" TEE remote processor control driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
> new file mode 100644
> index 000000000000..571e47190d02
> --- /dev/null
> +++ b/include/linux/tee_remoteproc.h
> @@ -0,0 +1,112 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
> + */
> +
> +#ifndef TEE_REMOTEPROC_H
> +#define TEE_REMOTEPROC_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
> + * @rsc_table:		Resource table virtual address.
> + */
> +struct tee_rproc {
> +	struct list_head node;
> +	struct rproc *rproc;
> +	struct device *parent;
> +	u32 rproc_id;
> +	u32 session_id;
> +	struct resource_table *rsc_table;
> +};
> +
> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
> +
> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> +{
> +	/* This shouldn't be possible */
> +	WARN_ON(1);
> +
> +	return NULL;
> +}
> +
> +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_TEE_REMOTEPROC */
> +#endif /* TEE_REMOTEPROC_H */
> -- 
> 2.25.1
>

Arnaud POULIQUEN March 26, 2024, 7:18 p.m. UTC | #3

Hello Mathieu,

On 3/25/24 17:46, Mathieu Poirier wrote:
> On Fri, Mar 08, 2024 at 03:47:05PM +0100, 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 device offers a client
> 
> Device or driver?  I thought I touched on that before.

Right, I changed the first instance and missed this one

> 
>> interface to load a firmware in the secure part.
>> This firmware could be authenticated by the secure trusted application.
>>
>> Signed-off-by: Arnaud Pouliquen <[e-mail]>
>> ---
>> Updates from V3:
>> - rework TEE_REMOTEPROC description in Kconfig
>> - fix some namings
>> - add tee_rproc_parse_fw  to support rproc_ops::parse_fw
>> - add proc::tee_interface;
>> - add rproc struct as parameter of the tee_rproc_register() function
>> ---
>>  drivers/remoteproc/Kconfig          |  10 +
>>  drivers/remoteproc/Makefile         |   1 +
>>  drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
>>  include/linux/remoteproc.h          |   4 +
>>  include/linux/tee_remoteproc.h      | 112 +++++++
>>  5 files changed, 561 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 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
>> +	tristate "remoteproc support by a TEE application"
> 
> s/remoteproc/Remoteproc
> 
>> +	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..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..c855210e52e3
>> --- /dev/null
>> +++ b/drivers/remoteproc/tee_remoteproc.c
>> @@ -0,0 +1,434 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/*
>> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
>> + * Author: Arnaud Pouliquen <[e-mail]>
>> + */
>> +
>> +#include <linux/firmware.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/remoteproc.h>
>> +#include <linux/slab.h>
>> +#include <linux/tee_drv.h>
>> +#include <linux/tee_remoteproc.h>
>> +
>> +#include "remoteproc_internal.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_ioctl_invoke_arg arg;
>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>> +	struct tee_rproc *trproc = rproc->tee_interface;
>> +	struct tee_shm *fw_shm;
>> +	int ret;
> 
> Declarations in reverse ascending order here and everywhere in the driver.
> Sometimes it is done properly, sometimes it isn't. 
> 
>> +
>> +	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);
>> +
>> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
>> +{
>> +	struct tee_ioctl_invoke_arg arg;
>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>> +	struct tee_rproc *trproc = rproc->tee_interface;
>> +	struct resource_table *rsc_table;
>> +	int ret;
>> +
>> +	if (!trproc)
>> +		return ERR_PTR(-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 ERR_PTR(-EIO);
>> +	}
>> +
>> +	*table_sz = param[2].u.value.a;
>> +
>> +	/* If the size is null no resource table defined in the image */
>> +	if (!*table_sz)
>> +		return NULL;
>> +
>> +	/* Store the resource table address that would be updated by the remote core. */
>> +	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
>> +	if (IS_ERR_OR_NULL(rsc_table)) {
>> +		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
>> +			param[1].u.value.a, *table_sz);
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	return rsc_table;
>> +}
>> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
>> +
>> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
>> +{
>> +	struct tee_rproc *trproc = rproc->tee_interface;
>> +	struct resource_table *rsc_table;
>> +	size_t table_sz;
>> +	int ret;
>> +
>> +	ret = tee_rproc_load_fw(rproc, fw);
>> +	if (ret)
>> +		return ret;
>> +
>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
>> +	if (IS_ERR(rsc_table))
>> +		return PTR_ERR(rsc_table);
>> +
>> +	/* Create a copy of the resource table to have same behaviour than the elf loader. */
>> +	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
>> +	if (!rproc->cached_table)
>> +		return -ENOMEM;
> 
> Why not ->table_ptr and setting ->cached_table to NULL?

It was my plan preparing this version. But during implementarion it looks
to me that having exactly same behavior than the ELF loader would be
simpler to maintain the remoteproc avoiding to update in the remoteproc core
to manage for the cached resource table (see also my comment below abourt recovery)
That why I propose this implementation

That said what you proposal should also work (with some updates in
remoteproc_core for the management of the cached table).

So please just comfirm your preference.

> 
>> +
>> +	rproc->table_ptr = rproc->cached_table;
>> +	rproc->table_sz = table_sz;
>> +	trproc->rsc_table = rsc_table;
> 
> I really don't see why this is needed, please remove and use rproc->table_ptr
> instead.

I need to store it for the iounmap in tee_rproc_remove.

> 
>> +
>> +	return 0;
>> +}
>> +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;
>> +	struct resource_table *rsc_table;
>> +	size_t table_sz;
>> +
>> +	if (!trproc)
>> +		return ERR_PTR(-EINVAL);
>> +
>> +	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
>> +	if (trproc->rsc_table)
>> +		return trproc->rsc_table;
> 
> Again, why not simply use rproc->rsc_table?  This function should only return
> the resource table that was set in tee_rproc_parse_fw(). 

In case of recovery rproc->_rsc_table point to the cached table [1]
and we need to reapply the configuration in rproc_start() called during the
recovery[2]
[1]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1586
[2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1287

> 
>> +
>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
>> +	if (IS_ERR(rsc_table))
>> +		return rsc_table;
>> +
>> +	rproc->table_sz = table_sz;
>> +	trproc->rsc_table = rsc_table;
>> +
>> +	return rsc_table;
>> +}
>> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
>> +
>> +int tee_rproc_start(struct rproc *rproc)
>> +{
>> +	struct tee_ioctl_invoke_arg arg;
>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>> +	struct tee_rproc *trproc = rproc->tee_interface;
>> +	int ret;
>> +
>> +	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)
>> +			ret = -EIO;
>> +	}
>> +
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(tee_rproc_start);
>> +
>> +int tee_rproc_stop(struct rproc *rproc)
>> +{
>> +	struct tee_ioctl_invoke_arg arg;
>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>> +	struct tee_rproc *trproc = rproc->tee_interface;
>> +	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;
>> +	}
>> +
>> +	if (!rproc->table_ptr)
>> +		return ret;
>> +
>> +	iounmap(trproc->rsc_table);
>> +	trproc->rsc_table = NULL;
>> +	rproc->table_ptr = NULL;
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
>> +
>> +static const struct tee_client_device_id stm32_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_client_device *tee_device;
>> +	struct tee_ioctl_open_session_arg sess_arg;
>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>> +	struct tee_rproc *trproc;
>> +	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);
>> +
>> +	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
>> +	if (!trproc)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	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);
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	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;
> 
> Once this function was called by a client, what prevents a user from unloading
> the tee_remoteproc module and breaking everything?

Good point! seems better toremove the module build capability

Thanks,
Arnaud

> 
>> +}
>> +EXPORT_SYMBOL_GPL(tee_rproc_register);
>> +
>> +int tee_rproc_unregister(struct tee_rproc *trproc)
>> +{
> 
> If you pass a struct_rproc instead of a struct tee_rproc there is no need for
> tee_rproc::rproc, which is only ever used in this function.
> 
> 
>> +	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;
>> +
>> +	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_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);
>> +		if (entry->rsc_table)
>> +			iounmap(entry->rsc_table);
>> +		kfree(entry);
>> +	}
>> +
>> +	tee_client_close_context(tee_rproc_ctx->tee_ctx);
>> +
>> +	return 0;
>> +}
>> +
>> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
>> +
>> +static struct tee_client_driver tee_rproc_fw_driver = {
>> +	.id_table	= stm32_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(" TEE remote processor control driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
>> new file mode 100644
>> index 000000000000..571e47190d02
>> --- /dev/null
>> +++ b/include/linux/tee_remoteproc.h
>> @@ -0,0 +1,112 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>> +/*
>> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
>> + */
>> +
>> +#ifndef TEE_REMOTEPROC_H
>> +#define TEE_REMOTEPROC_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
>> + * @rsc_table:		Resource table virtual address.
>> + */
>> +struct tee_rproc {
>> +	struct list_head node;
>> +	struct rproc *rproc;
>> +	struct device *parent;
>> +	u32 rproc_id;
>> +	u32 session_id;
>> +	struct resource_table *rsc_table;
>> +};
>> +
>> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
>> +
>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
>> +{
>> +	/* This shouldn't be possible */
>> +	WARN_ON(1);
>> +
>> +	return NULL;
>> +}
>> +
>> +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_TEE_REMOTEPROC */
>> +#endif /* TEE_REMOTEPROC_H */
>> -- 
>> 2.25.1
>>

Mathieu Poirier March 27, 2024, 5:07 p.m. UTC | #4

On Tue, Mar 26, 2024 at 08:18:23PM +0100, Arnaud POULIQUEN wrote:
> Hello Mathieu,
> 
> On 3/25/24 17:46, Mathieu Poirier wrote:
> > On Fri, Mar 08, 2024 at 03:47:05PM +0100, 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 device offers a client
> > 
> > Device or driver?  I thought I touched on that before.
> 
> Right, I changed the first instance and missed this one
> 
> > 
> >> interface to load a firmware in the secure part.
> >> This firmware could be authenticated by the secure trusted application.
> >>
> >> Signed-off-by: Arnaud Pouliquen <[e-mail]>
> >> ---
> >> Updates from V3:
> >> - rework TEE_REMOTEPROC description in Kconfig
> >> - fix some namings
> >> - add tee_rproc_parse_fw  to support rproc_ops::parse_fw
> >> - add proc::tee_interface;
> >> - add rproc struct as parameter of the tee_rproc_register() function
> >> ---
> >>  drivers/remoteproc/Kconfig          |  10 +
> >>  drivers/remoteproc/Makefile         |   1 +
> >>  drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
> >>  include/linux/remoteproc.h          |   4 +
> >>  include/linux/tee_remoteproc.h      | 112 +++++++
> >>  5 files changed, 561 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 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
> >> +	tristate "remoteproc support by a TEE application"
> > 
> > s/remoteproc/Remoteproc
> > 
> >> +	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..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..c855210e52e3
> >> --- /dev/null
> >> +++ b/drivers/remoteproc/tee_remoteproc.c
> >> @@ -0,0 +1,434 @@
> >> +// SPDX-License-Identifier: GPL-2.0-or-later
> >> +/*
> >> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
> >> + * Author: Arnaud Pouliquen <[e-mail]>
> >> + */
> >> +
> >> +#include <linux/firmware.h>
> >> +#include <linux/io.h>
> >> +#include <linux/module.h>
> >> +#include <linux/remoteproc.h>
> >> +#include <linux/slab.h>
> >> +#include <linux/tee_drv.h>
> >> +#include <linux/tee_remoteproc.h>
> >> +
> >> +#include "remoteproc_internal.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_ioctl_invoke_arg arg;
> >> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >> +	struct tee_rproc *trproc = rproc->tee_interface;
> >> +	struct tee_shm *fw_shm;
> >> +	int ret;
> > 
> > Declarations in reverse ascending order here and everywhere in the driver.
> > Sometimes it is done properly, sometimes it isn't. 
> > 
> >> +
> >> +	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);
> >> +
> >> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> >> +{
> >> +	struct tee_ioctl_invoke_arg arg;
> >> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >> +	struct tee_rproc *trproc = rproc->tee_interface;
> >> +	struct resource_table *rsc_table;
> >> +	int ret;
> >> +
> >> +	if (!trproc)
> >> +		return ERR_PTR(-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 ERR_PTR(-EIO);
> >> +	}
> >> +
> >> +	*table_sz = param[2].u.value.a;
> >> +
> >> +	/* If the size is null no resource table defined in the image */
> >> +	if (!*table_sz)
> >> +		return NULL;
> >> +
> >> +	/* Store the resource table address that would be updated by the remote core. */
> >> +	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
> >> +	if (IS_ERR_OR_NULL(rsc_table)) {
> >> +		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
> >> +			param[1].u.value.a, *table_sz);
> >> +		return ERR_PTR(-ENOMEM);
> >> +	}
> >> +
> >> +	return rsc_table;
> >> +}
> >> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
> >> +
> >> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> >> +{
> >> +	struct tee_rproc *trproc = rproc->tee_interface;
> >> +	struct resource_table *rsc_table;
> >> +	size_t table_sz;
> >> +	int ret;
> >> +
> >> +	ret = tee_rproc_load_fw(rproc, fw);
> >> +	if (ret)
> >> +		return ret;
> >> +
> >> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> >> +	if (IS_ERR(rsc_table))
> >> +		return PTR_ERR(rsc_table);
> >> +
> >> +	/* Create a copy of the resource table to have same behaviour than the elf loader. */
> >> +	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
> >> +	if (!rproc->cached_table)
> >> +		return -ENOMEM;
> > 
> > Why not ->table_ptr and setting ->cached_table to NULL?
> 
> It was my plan preparing this version. But during implementarion it looks
> to me that having exactly same behavior than the ELF loader would be
> simpler to maintain the remoteproc avoiding to update in the remoteproc core
> to manage for the cached resource table (see also my comment below abourt recovery)
> That why I propose this implementation
> 
> That said what you proposal should also work (with some updates in
> remoteproc_core for the management of the cached table).
>

Yes

> So please just comfirm your preference.
>

Definitely keep ->cached_table to NULL.  

> > 
> >> +
> >> +	rproc->table_ptr = rproc->cached_table;
> >> +	rproc->table_sz = table_sz;
> >> +	trproc->rsc_table = rsc_table;
> > 
> > I really don't see why this is needed, please remove and use rproc->table_ptr
> > instead.
> 
> I need to store it for the iounmap in tee_rproc_remove.

iounmap(entry->rproc->rsc_table);

What am I missing?

> 
> > 
> >> +
> >> +	return 0;
> >> +}
> >> +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;
> >> +	struct resource_table *rsc_table;
> >> +	size_t table_sz;
> >> +
> >> +	if (!trproc)
> >> +		return ERR_PTR(-EINVAL);
> >> +
> >> +	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
> >> +	if (trproc->rsc_table)
> >> +		return trproc->rsc_table;
> > 
> > Again, why not simply use rproc->rsc_table?  This function should only return
> > the resource table that was set in tee_rproc_parse_fw(). 
> 
> In case of recovery rproc->_rsc_table point to the cached table [1]
 
In [1], on line 1554, add a check for rproc->tee_interface and if it is valid
call rproc_find_loaded_rsc_table(). 

> and we need to reapply the configuration in rproc_start() called during the
> recovery[2]

1) Rename rproc_set_rsc_table() to rproc_set_rsc_table_on_attach()
2) Introduce a new function called rproc_set_rsc_table_on_start()
3) Move code from [2], line 1278 to 1292, to that new function.  In the new
function, add a check on rproc->tee_interface.  If it is valid then call
rproc_find_loaded_rsc_table().
4) in rproc_start(), replace lines 1278 to 1292 with a call to
rproc_set_rsc_table_on_start().

> [1]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1586
> [2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1287
> 
> > 
> >> +
> >> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> >> +	if (IS_ERR(rsc_table))
> >> +		return rsc_table;
> >> +
> >> +	rproc->table_sz = table_sz;
> >> +	trproc->rsc_table = rsc_table;
> >> +
> >> +	return rsc_table;
> >> +}
> >> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
> >> +
> >> +int tee_rproc_start(struct rproc *rproc)
> >> +{
> >> +	struct tee_ioctl_invoke_arg arg;
> >> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >> +	struct tee_rproc *trproc = rproc->tee_interface;
> >> +	int ret;
> >> +
> >> +	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)
> >> +			ret = -EIO;
> >> +	}
> >> +
> >> +	return ret;
> >> +}
> >> +EXPORT_SYMBOL_GPL(tee_rproc_start);
> >> +
> >> +int tee_rproc_stop(struct rproc *rproc)
> >> +{
> >> +	struct tee_ioctl_invoke_arg arg;
> >> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >> +	struct tee_rproc *trproc = rproc->tee_interface;
> >> +	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;
> >> +	}
> >> +
> >> +	if (!rproc->table_ptr)
> >> +		return ret;
> >> +
> >> +	iounmap(trproc->rsc_table);
> >> +	trproc->rsc_table = NULL;
> >> +	rproc->table_ptr = NULL;
> >> +
> >> +	return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
> >> +
> >> +static const struct tee_client_device_id stm32_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_client_device *tee_device;
> >> +	struct tee_ioctl_open_session_arg sess_arg;
> >> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >> +	struct tee_rproc *trproc;
> >> +	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);
> >> +
> >> +	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
> >> +	if (!trproc)
> >> +		return ERR_PTR(-ENOMEM);
> >> +
> >> +	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);
> >> +		return ERR_PTR(-EINVAL);
> >> +	}
> >> +
> >> +	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;
> > 
> > Once this function was called by a client, what prevents a user from unloading
> > the tee_remoteproc module and breaking everything?
> 
> Good point! seems better toremove the module build capability
> 

I was thinking more along the lines of try_module_get() and module_put() to
avoid bloating the core.

> Thanks,
> Arnaud
> 
> > 
> >> +}
> >> +EXPORT_SYMBOL_GPL(tee_rproc_register);
> >> +
> >> +int tee_rproc_unregister(struct tee_rproc *trproc)
> >> +{
> > 
> > If you pass a struct_rproc instead of a struct tee_rproc there is no need for
> > tee_rproc::rproc, which is only ever used in this function.
> > 
> > 
> >> +	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;
> >> +
> >> +	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_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);
> >> +		if (entry->rsc_table)
> >> +			iounmap(entry->rsc_table);
> >> +		kfree(entry);
> >> +	}
> >> +
> >> +	tee_client_close_context(tee_rproc_ctx->tee_ctx);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
> >> +
> >> +static struct tee_client_driver tee_rproc_fw_driver = {
> >> +	.id_table	= stm32_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(" TEE remote processor control driver");
> >> +MODULE_LICENSE("GPL");
> >> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> >> index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
> >> new file mode 100644
> >> index 000000000000..571e47190d02
> >> --- /dev/null
> >> +++ b/include/linux/tee_remoteproc.h
> >> @@ -0,0 +1,112 @@
> >> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> >> +/*
> >> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
> >> + */
> >> +
> >> +#ifndef TEE_REMOTEPROC_H
> >> +#define TEE_REMOTEPROC_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
> >> + * @rsc_table:		Resource table virtual address.
> >> + */
> >> +struct tee_rproc {
> >> +	struct list_head node;
> >> +	struct rproc *rproc;
> >> +	struct device *parent;
> >> +	u32 rproc_id;
> >> +	u32 session_id;
> >> +	struct resource_table *rsc_table;
> >> +};
> >> +
> >> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
> >> +
> >> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
> >> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> >> +{
> >> +	/* This shouldn't be possible */
> >> +	WARN_ON(1);
> >> +
> >> +	return NULL;
> >> +}
> >> +
> >> +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_TEE_REMOTEPROC */
> >> +#endif /* TEE_REMOTEPROC_H */
> >> -- 
> >> 2.25.1
> >>

Arnaud POULIQUEN March 29, 2024, 8:58 a.m. UTC | #5

Hello Mathieu,

On 3/27/24 18:07, Mathieu Poirier wrote:
> On Tue, Mar 26, 2024 at 08:18:23PM +0100, Arnaud POULIQUEN wrote:
>> Hello Mathieu,
>>
>> On 3/25/24 17:46, Mathieu Poirier wrote:
>>> On Fri, Mar 08, 2024 at 03:47:05PM +0100, 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 device offers a client
>>>
>>> Device or driver?  I thought I touched on that before.
>>
>> Right, I changed the first instance and missed this one
>>
>>>
>>>> interface to load a firmware in the secure part.
>>>> This firmware could be authenticated by the secure trusted application.
>>>>
>>>> Signed-off-by: Arnaud Pouliquen <[e-mail]>
>>>> ---
>>>> Updates from V3:
>>>> - rework TEE_REMOTEPROC description in Kconfig
>>>> - fix some namings
>>>> - add tee_rproc_parse_fw  to support rproc_ops::parse_fw
>>>> - add proc::tee_interface;
>>>> - add rproc struct as parameter of the tee_rproc_register() function
>>>> ---
>>>>  drivers/remoteproc/Kconfig          |  10 +
>>>>  drivers/remoteproc/Makefile         |   1 +
>>>>  drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
>>>>  include/linux/remoteproc.h          |   4 +
>>>>  include/linux/tee_remoteproc.h      | 112 +++++++
>>>>  5 files changed, 561 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 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
>>>> +	tristate "remoteproc support by a TEE application"
>>>
>>> s/remoteproc/Remoteproc
>>>
>>>> +	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..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..c855210e52e3
>>>> --- /dev/null
>>>> +++ b/drivers/remoteproc/tee_remoteproc.c
>>>> @@ -0,0 +1,434 @@
>>>> +// SPDX-License-Identifier: GPL-2.0-or-later
>>>> +/*
>>>> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
>>>> + * Author: Arnaud Pouliquen <[e-mail]>
>>>> + */
>>>> +
>>>> +#include <linux/firmware.h>
>>>> +#include <linux/io.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/remoteproc.h>
>>>> +#include <linux/slab.h>
>>>> +#include <linux/tee_drv.h>
>>>> +#include <linux/tee_remoteproc.h>
>>>> +
>>>> +#include "remoteproc_internal.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_ioctl_invoke_arg arg;
>>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>>>> +	struct tee_rproc *trproc = rproc->tee_interface;
>>>> +	struct tee_shm *fw_shm;
>>>> +	int ret;
>>>
>>> Declarations in reverse ascending order here and everywhere in the driver.
>>> Sometimes it is done properly, sometimes it isn't. 
>>>
>>>> +
>>>> +	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);
>>>> +
>>>> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
>>>> +{
>>>> +	struct tee_ioctl_invoke_arg arg;
>>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>>>> +	struct tee_rproc *trproc = rproc->tee_interface;
>>>> +	struct resource_table *rsc_table;
>>>> +	int ret;
>>>> +
>>>> +	if (!trproc)
>>>> +		return ERR_PTR(-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 ERR_PTR(-EIO);
>>>> +	}
>>>> +
>>>> +	*table_sz = param[2].u.value.a;
>>>> +
>>>> +	/* If the size is null no resource table defined in the image */
>>>> +	if (!*table_sz)
>>>> +		return NULL;
>>>> +
>>>> +	/* Store the resource table address that would be updated by the remote core. */
>>>> +	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
>>>> +	if (IS_ERR_OR_NULL(rsc_table)) {
>>>> +		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
>>>> +			param[1].u.value.a, *table_sz);
>>>> +		return ERR_PTR(-ENOMEM);
>>>> +	}
>>>> +
>>>> +	return rsc_table;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
>>>> +
>>>> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
>>>> +{
>>>> +	struct tee_rproc *trproc = rproc->tee_interface;
>>>> +	struct resource_table *rsc_table;
>>>> +	size_t table_sz;
>>>> +	int ret;
>>>> +
>>>> +	ret = tee_rproc_load_fw(rproc, fw);
>>>> +	if (ret)
>>>> +		return ret;
>>>> +
>>>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
>>>> +	if (IS_ERR(rsc_table))
>>>> +		return PTR_ERR(rsc_table);
>>>> +
>>>> +	/* Create a copy of the resource table to have same behaviour than the elf loader. */
>>>> +	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
>>>> +	if (!rproc->cached_table)
>>>> +		return -ENOMEM;
>>>
>>> Why not ->table_ptr and setting ->cached_table to NULL?
>>
>> It was my plan preparing this version. But during implementarion it looks
>> to me that having exactly same behavior than the ELF loader would be
>> simpler to maintain the remoteproc avoiding to update in the remoteproc core
>> to manage for the cached resource table (see also my comment below abourt recovery)
>> That why I propose this implementation
>>
>> That said what you proposal should also work (with some updates in
>> remoteproc_core for the management of the cached table).
>>
> 
> Yes
> 
>> So please just comfirm your preference.
>>
> 
> Definitely keep ->cached_table to NULL.  
> 
>>>
>>>> +
>>>> +	rproc->table_ptr = rproc->cached_table;
>>>> +	rproc->table_sz = table_sz;
>>>> +	trproc->rsc_table = rsc_table;
>>>
>>> I really don't see why this is needed, please remove and use rproc->table_ptr
>>> instead.
>>
>> I need to store it for the iounmap in tee_rproc_remove.
> 
> iounmap(entry->rproc->rsc_table);
> 
> What am I missing?

rproc->rsc_table is a field that can be updated by remoteproc_core.
How can we garanty in tee_remoteproc that it still points to the mapped resource
table?
As the remoteproc_tee maps the pointer, it seems reliable that it stores it for
unmap.

Seems also that I also missed to  handle the case where rproc_fw_boot() fails[3]
(not done yet).

[3]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1442


> 
>>
>>>
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +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;
>>>> +	struct resource_table *rsc_table;
>>>> +	size_t table_sz;
>>>> +
>>>> +	if (!trproc)
>>>> +		return ERR_PTR(-EINVAL);
>>>> +
>>>> +	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
>>>> +	if (trproc->rsc_table)
>>>> +		return trproc->rsc_table;
>>>
>>> Again, why not simply use rproc->rsc_table?  This function should only return
>>> the resource table that was set in tee_rproc_parse_fw(). 
>>
>> In case of recovery rproc->_rsc_table point to the cached table [1]
>  
> In [1], on line 1554, add a check for rproc->tee_interface and if it is valid
> call rproc_find_loaded_rsc_table(). 
> 
>> and we need to reapply the configuration in rproc_start() called during the
>> recovery[2]
> 
> 1) Rename rproc_set_rsc_table() to rproc_set_rsc_table_on_attach()
> 2) Introduce a new function called rproc_set_rsc_table_on_start()
> 3) Move code from [2], line 1278 to 1292, to that new function.  In the new
> function, add a check on rproc->tee_interface.  If it is valid then call
> rproc_find_loaded_rsc_table().
> 4) in rproc_start(), replace lines 1278 to 1292 with a call to
> rproc_set_rsc_table_on_start().


I will try this

Thanks!
Arnaud

> 
>> [1]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1586
>> [2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1287
>>
>>>
>>>> +
>>>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
>>>> +	if (IS_ERR(rsc_table))
>>>> +		return rsc_table;
>>>> +
>>>> +	rproc->table_sz = table_sz;
>>>> +	trproc->rsc_table = rsc_table;
>>>> +
>>>> +	return rsc_table;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
>>>> +
>>>> +int tee_rproc_start(struct rproc *rproc)
>>>> +{
>>>> +	struct tee_ioctl_invoke_arg arg;
>>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>>>> +	struct tee_rproc *trproc = rproc->tee_interface;
>>>> +	int ret;
>>>> +
>>>> +	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)
>>>> +			ret = -EIO;
>>>> +	}
>>>> +
>>>> +	return ret;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(tee_rproc_start);
>>>> +
>>>> +int tee_rproc_stop(struct rproc *rproc)
>>>> +{
>>>> +	struct tee_ioctl_invoke_arg arg;
>>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>>>> +	struct tee_rproc *trproc = rproc->tee_interface;
>>>> +	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;
>>>> +	}
>>>> +
>>>> +	if (!rproc->table_ptr)
>>>> +		return ret;
>>>> +
>>>> +	iounmap(trproc->rsc_table);
>>>> +	trproc->rsc_table = NULL;
>>>> +	rproc->table_ptr = NULL;
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
>>>> +
>>>> +static const struct tee_client_device_id stm32_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_client_device *tee_device;
>>>> +	struct tee_ioctl_open_session_arg sess_arg;
>>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
>>>> +	struct tee_rproc *trproc;
>>>> +	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);
>>>> +
>>>> +	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
>>>> +	if (!trproc)
>>>> +		return ERR_PTR(-ENOMEM);
>>>> +
>>>> +	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);
>>>> +		return ERR_PTR(-EINVAL);
>>>> +	}
>>>> +
>>>> +	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;
>>>
>>> Once this function was called by a client, what prevents a user from unloading
>>> the tee_remoteproc module and breaking everything?
>>
>> Good point! seems better toremove the module build capability
>>
> 
> I was thinking more along the lines of try_module_get() and module_put() to
> avoid bloating the core.
> 
>> Thanks,
>> Arnaud
>>
>>>
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(tee_rproc_register);
>>>> +
>>>> +int tee_rproc_unregister(struct tee_rproc *trproc)
>>>> +{
>>>
>>> If you pass a struct_rproc instead of a struct tee_rproc there is no need for
>>> tee_rproc::rproc, which is only ever used in this function.
>>>
>>>
>>>> +	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;
>>>> +
>>>> +	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_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);
>>>> +		if (entry->rsc_table)
>>>> +			iounmap(entry->rsc_table);
>>>> +		kfree(entry);
>>>> +	}
>>>> +
>>>> +	tee_client_close_context(tee_rproc_ctx->tee_ctx);
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +
>>>> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
>>>> +
>>>> +static struct tee_client_driver tee_rproc_fw_driver = {
>>>> +	.id_table	= stm32_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(" TEE remote processor control driver");
>>>> +MODULE_LICENSE("GPL");
>>>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>>>> index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
>>>> new file mode 100644
>>>> index 000000000000..571e47190d02
>>>> --- /dev/null
>>>> +++ b/include/linux/tee_remoteproc.h
>>>> @@ -0,0 +1,112 @@
>>>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>>>> +/*
>>>> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
>>>> + */
>>>> +
>>>> +#ifndef TEE_REMOTEPROC_H
>>>> +#define TEE_REMOTEPROC_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
>>>> + * @rsc_table:		Resource table virtual address.
>>>> + */
>>>> +struct tee_rproc {
>>>> +	struct list_head node;
>>>> +	struct rproc *rproc;
>>>> +	struct device *parent;
>>>> +	u32 rproc_id;
>>>> +	u32 session_id;
>>>> +	struct resource_table *rsc_table;
>>>> +};
>>>> +
>>>> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
>>>> +
>>>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
>>>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
>>>> +{
>>>> +	/* This shouldn't be possible */
>>>> +	WARN_ON(1);
>>>> +
>>>> +	return NULL;
>>>> +}
>>>> +
>>>> +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_TEE_REMOTEPROC */
>>>> +#endif /* TEE_REMOTEPROC_H */
>>>> -- 
>>>> 2.25.1
>>>>

Mathieu Poirier April 1, 2024, 3:54 p.m. UTC | #6

On Fri, Mar 29, 2024 at 09:58:11AM +0100, Arnaud POULIQUEN wrote:
> Hello Mathieu,
> 
> On 3/27/24 18:07, Mathieu Poirier wrote:
> > On Tue, Mar 26, 2024 at 08:18:23PM +0100, Arnaud POULIQUEN wrote:
> >> Hello Mathieu,
> >>
> >> On 3/25/24 17:46, Mathieu Poirier wrote:
> >>> On Fri, Mar 08, 2024 at 03:47:05PM +0100, 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 device offers a client
> >>>
> >>> Device or driver?  I thought I touched on that before.
> >>
> >> Right, I changed the first instance and missed this one
> >>
> >>>
> >>>> interface to load a firmware in the secure part.
> >>>> This firmware could be authenticated by the secure trusted application.
> >>>>
> >>>> Signed-off-by: Arnaud Pouliquen <[e-mail]>
> >>>> ---
> >>>> Updates from V3:
> >>>> - rework TEE_REMOTEPROC description in Kconfig
> >>>> - fix some namings
> >>>> - add tee_rproc_parse_fw  to support rproc_ops::parse_fw
> >>>> - add proc::tee_interface;
> >>>> - add rproc struct as parameter of the tee_rproc_register() function
> >>>> ---
> >>>>  drivers/remoteproc/Kconfig          |  10 +
> >>>>  drivers/remoteproc/Makefile         |   1 +
> >>>>  drivers/remoteproc/tee_remoteproc.c | 434 ++++++++++++++++++++++++++++
> >>>>  include/linux/remoteproc.h          |   4 +
> >>>>  include/linux/tee_remoteproc.h      | 112 +++++++
> >>>>  5 files changed, 561 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 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
> >>>> +	tristate "remoteproc support by a TEE application"
> >>>
> >>> s/remoteproc/Remoteproc
> >>>
> >>>> +	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..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..c855210e52e3
> >>>> --- /dev/null
> >>>> +++ b/drivers/remoteproc/tee_remoteproc.c
> >>>> @@ -0,0 +1,434 @@
> >>>> +// SPDX-License-Identifier: GPL-2.0-or-later
> >>>> +/*
> >>>> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
> >>>> + * Author: Arnaud Pouliquen <[e-mail]>
> >>>> + */
> >>>> +
> >>>> +#include <linux/firmware.h>
> >>>> +#include <linux/io.h>
> >>>> +#include <linux/module.h>
> >>>> +#include <linux/remoteproc.h>
> >>>> +#include <linux/slab.h>
> >>>> +#include <linux/tee_drv.h>
> >>>> +#include <linux/tee_remoteproc.h>
> >>>> +
> >>>> +#include "remoteproc_internal.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_ioctl_invoke_arg arg;
> >>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >>>> +	struct tee_rproc *trproc = rproc->tee_interface;
> >>>> +	struct tee_shm *fw_shm;
> >>>> +	int ret;
> >>>
> >>> Declarations in reverse ascending order here and everywhere in the driver.
> >>> Sometimes it is done properly, sometimes it isn't. 
> >>>
> >>>> +
> >>>> +	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);
> >>>> +
> >>>> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> >>>> +{
> >>>> +	struct tee_ioctl_invoke_arg arg;
> >>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >>>> +	struct tee_rproc *trproc = rproc->tee_interface;
> >>>> +	struct resource_table *rsc_table;
> >>>> +	int ret;
> >>>> +
> >>>> +	if (!trproc)
> >>>> +		return ERR_PTR(-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 ERR_PTR(-EIO);
> >>>> +	}
> >>>> +
> >>>> +	*table_sz = param[2].u.value.a;
> >>>> +
> >>>> +	/* If the size is null no resource table defined in the image */
> >>>> +	if (!*table_sz)
> >>>> +		return NULL;
> >>>> +
> >>>> +	/* Store the resource table address that would be updated by the remote core. */
> >>>> +	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
> >>>> +	if (IS_ERR_OR_NULL(rsc_table)) {
> >>>> +		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
> >>>> +			param[1].u.value.a, *table_sz);
> >>>> +		return ERR_PTR(-ENOMEM);
> >>>> +	}
> >>>> +
> >>>> +	return rsc_table;
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
> >>>> +
> >>>> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> >>>> +{
> >>>> +	struct tee_rproc *trproc = rproc->tee_interface;
> >>>> +	struct resource_table *rsc_table;
> >>>> +	size_t table_sz;
> >>>> +	int ret;
> >>>> +
> >>>> +	ret = tee_rproc_load_fw(rproc, fw);
> >>>> +	if (ret)
> >>>> +		return ret;
> >>>> +
> >>>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> >>>> +	if (IS_ERR(rsc_table))
> >>>> +		return PTR_ERR(rsc_table);
> >>>> +
> >>>> +	/* Create a copy of the resource table to have same behaviour than the elf loader. */
> >>>> +	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
> >>>> +	if (!rproc->cached_table)
> >>>> +		return -ENOMEM;
> >>>
> >>> Why not ->table_ptr and setting ->cached_table to NULL?
> >>
> >> It was my plan preparing this version. But during implementarion it looks
> >> to me that having exactly same behavior than the ELF loader would be
> >> simpler to maintain the remoteproc avoiding to update in the remoteproc core
> >> to manage for the cached resource table (see also my comment below abourt recovery)
> >> That why I propose this implementation
> >>
> >> That said what you proposal should also work (with some updates in
> >> remoteproc_core for the management of the cached table).
> >>
> > 
> > Yes
> > 
> >> So please just comfirm your preference.
> >>
> > 
> > Definitely keep ->cached_table to NULL.  
> > 
> >>>
> >>>> +
> >>>> +	rproc->table_ptr = rproc->cached_table;
> >>>> +	rproc->table_sz = table_sz;
> >>>> +	trproc->rsc_table = rsc_table;
> >>>
> >>> I really don't see why this is needed, please remove and use rproc->table_ptr
> >>> instead.
> >>
> >> I need to store it for the iounmap in tee_rproc_remove.
> > 
> > iounmap(entry->rproc->rsc_table);
> > 
> > What am I missing?
> 
> rproc->rsc_table is a field that can be updated by remoteproc_core.
> How can we garanty in tee_remoteproc that it still points to the mapped resource
> table?

By making sure the core doesn't touch rproc->rsc_table when
rproc->tee_interface is valid.

> As the remoteproc_tee maps the pointer, it seems reliable that it stores it for
> unmap.
> 

Doing so creates a shadow value that is confusing and really hard to maintain
going forward.

> Seems also that I also missed to  handle the case where rproc_fw_boot() fails[3]
> (not done yet).
> 
> [3]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1442
> 
> 
> > 
> >>
> >>>
> >>>> +
> >>>> +	return 0;
> >>>> +}
> >>>> +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;
> >>>> +	struct resource_table *rsc_table;
> >>>> +	size_t table_sz;
> >>>> +
> >>>> +	if (!trproc)
> >>>> +		return ERR_PTR(-EINVAL);
> >>>> +
> >>>> +	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
> >>>> +	if (trproc->rsc_table)
> >>>> +		return trproc->rsc_table;
> >>>
> >>> Again, why not simply use rproc->rsc_table?  This function should only return
> >>> the resource table that was set in tee_rproc_parse_fw(). 
> >>
> >> In case of recovery rproc->_rsc_table point to the cached table [1]
> >  
> > In [1], on line 1554, add a check for rproc->tee_interface and if it is valid
> > call rproc_find_loaded_rsc_table(). 
> > 
> >> and we need to reapply the configuration in rproc_start() called during the
> >> recovery[2]
> > 
> > 1) Rename rproc_set_rsc_table() to rproc_set_rsc_table_on_attach()
> > 2) Introduce a new function called rproc_set_rsc_table_on_start()
> > 3) Move code from [2], line 1278 to 1292, to that new function.  In the new
> > function, add a check on rproc->tee_interface.  If it is valid then call
> > rproc_find_loaded_rsc_table().
> > 4) in rproc_start(), replace lines 1278 to 1292 with a call to
> > rproc_set_rsc_table_on_start().
> 
> 
> I will try this
> 

Ok

> Thanks!
> Arnaud
> 
> > 
> >> [1]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1586
> >> [2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1287
> >>
> >>>
> >>>> +
> >>>> +	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
> >>>> +	if (IS_ERR(rsc_table))
> >>>> +		return rsc_table;
> >>>> +
> >>>> +	rproc->table_sz = table_sz;
> >>>> +	trproc->rsc_table = rsc_table;
> >>>> +
> >>>> +	return rsc_table;
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
> >>>> +
> >>>> +int tee_rproc_start(struct rproc *rproc)
> >>>> +{
> >>>> +	struct tee_ioctl_invoke_arg arg;
> >>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >>>> +	struct tee_rproc *trproc = rproc->tee_interface;
> >>>> +	int ret;
> >>>> +
> >>>> +	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)
> >>>> +			ret = -EIO;
> >>>> +	}
> >>>> +
> >>>> +	return ret;
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(tee_rproc_start);
> >>>> +
> >>>> +int tee_rproc_stop(struct rproc *rproc)
> >>>> +{
> >>>> +	struct tee_ioctl_invoke_arg arg;
> >>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >>>> +	struct tee_rproc *trproc = rproc->tee_interface;
> >>>> +	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;
> >>>> +	}
> >>>> +
> >>>> +	if (!rproc->table_ptr)
> >>>> +		return ret;
> >>>> +
> >>>> +	iounmap(trproc->rsc_table);
> >>>> +	trproc->rsc_table = NULL;
> >>>> +	rproc->table_ptr = NULL;
> >>>> +
> >>>> +	return 0;
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
> >>>> +
> >>>> +static const struct tee_client_device_id stm32_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_client_device *tee_device;
> >>>> +	struct tee_ioctl_open_session_arg sess_arg;
> >>>> +	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> >>>> +	struct tee_rproc *trproc;
> >>>> +	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);
> >>>> +
> >>>> +	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
> >>>> +	if (!trproc)
> >>>> +		return ERR_PTR(-ENOMEM);
> >>>> +
> >>>> +	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);
> >>>> +		return ERR_PTR(-EINVAL);
> >>>> +	}
> >>>> +
> >>>> +	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;
> >>>
> >>> Once this function was called by a client, what prevents a user from unloading
> >>> the tee_remoteproc module and breaking everything?
> >>
> >> Good point! seems better toremove the module build capability
> >>
> > 
> > I was thinking more along the lines of try_module_get() and module_put() to
> > avoid bloating the core.
> > 
> >> Thanks,
> >> Arnaud
> >>
> >>>
> >>>> +}
> >>>> +EXPORT_SYMBOL_GPL(tee_rproc_register);
> >>>> +
> >>>> +int tee_rproc_unregister(struct tee_rproc *trproc)
> >>>> +{
> >>>
> >>> If you pass a struct_rproc instead of a struct tee_rproc there is no need for
> >>> tee_rproc::rproc, which is only ever used in this function.
> >>>
> >>>
> >>>> +	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;
> >>>> +
> >>>> +	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_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);
> >>>> +		if (entry->rsc_table)
> >>>> +			iounmap(entry->rsc_table);
> >>>> +		kfree(entry);
> >>>> +	}
> >>>> +
> >>>> +	tee_client_close_context(tee_rproc_ctx->tee_ctx);
> >>>> +
> >>>> +	return 0;
> >>>> +}
> >>>> +
> >>>> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
> >>>> +
> >>>> +static struct tee_client_driver tee_rproc_fw_driver = {
> >>>> +	.id_table	= stm32_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(" TEE remote processor control driver");
> >>>> +MODULE_LICENSE("GPL");
> >>>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> >>>> index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
> >>>> new file mode 100644
> >>>> index 000000000000..571e47190d02
> >>>> --- /dev/null
> >>>> +++ b/include/linux/tee_remoteproc.h
> >>>> @@ -0,0 +1,112 @@
> >>>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> >>>> +/*
> >>>> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
> >>>> + */
> >>>> +
> >>>> +#ifndef TEE_REMOTEPROC_H
> >>>> +#define TEE_REMOTEPROC_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
> >>>> + * @rsc_table:		Resource table virtual address.
> >>>> + */
> >>>> +struct tee_rproc {
> >>>> +	struct list_head node;
> >>>> +	struct rproc *rproc;
> >>>> +	struct device *parent;
> >>>> +	u32 rproc_id;
> >>>> +	u32 session_id;
> >>>> +	struct resource_table *rsc_table;
> >>>> +};
> >>>> +
> >>>> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
> >>>> +
> >>>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
> >>>> +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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
> >>>> +{
> >>>> +	/* This shouldn't be possible */
> >>>> +	WARN_ON(1);
> >>>> +
> >>>> +	return NULL;
> >>>> +}
> >>>> +
> >>>> +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_TEE_REMOTEPROC */
> >>>> +#endif /* TEE_REMOTEPROC_H */
> >>>> -- 
> >>>> 2.25.1
> >>>>

Patch

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 48845dc8fa85..2cf1431b2b59 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 TEE_REMOTEPROC
+	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..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..c855210e52e3
--- /dev/null
+++ b/drivers/remoteproc/tee_remoteproc.c
@@ -0,0 +1,434 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
+ * Author: Arnaud Pouliquen <[e-mail]>
+ */
+
+#include <linux/firmware.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/remoteproc.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include <linux/tee_remoteproc.h>
+
+#include "remoteproc_internal.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_ioctl_invoke_arg arg;
+	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+	struct tee_rproc *trproc = rproc->tee_interface;
+	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);
+
+struct resource_table *tee_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
+{
+	struct tee_ioctl_invoke_arg arg;
+	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+	struct tee_rproc *trproc = rproc->tee_interface;
+	struct resource_table *rsc_table;
+	int ret;
+
+	if (!trproc)
+		return ERR_PTR(-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 ERR_PTR(-EIO);
+	}
+
+	*table_sz = param[2].u.value.a;
+
+	/* If the size is null no resource table defined in the image */
+	if (!*table_sz)
+		return NULL;
+
+	/* Store the resource table address that would be updated by the remote core. */
+	rsc_table = ioremap_wc(param[1].u.value.a, *table_sz);
+	if (IS_ERR_OR_NULL(rsc_table)) {
+		dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n",
+			param[1].u.value.a, *table_sz);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return rsc_table;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table);
+
+int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+	struct tee_rproc *trproc = rproc->tee_interface;
+	struct resource_table *rsc_table;
+	size_t table_sz;
+	int ret;
+
+	ret = tee_rproc_load_fw(rproc, fw);
+	if (ret)
+		return ret;
+
+	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
+	if (IS_ERR(rsc_table))
+		return PTR_ERR(rsc_table);
+
+	/* Create a copy of the resource table to have same behaviour than the elf loader. */
+	rproc->cached_table = kmemdup(rsc_table, table_sz, GFP_KERNEL);
+	if (!rproc->cached_table)
+		return -ENOMEM;
+
+	rproc->table_ptr = rproc->cached_table;
+	rproc->table_sz = table_sz;
+	trproc->rsc_table = rsc_table;
+
+	return 0;
+}
+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;
+	struct resource_table *rsc_table;
+	size_t table_sz;
+
+	if (!trproc)
+		return ERR_PTR(-EINVAL);
+
+	/* Check if the resourse table has already been obtained in tee_rproc_parse_fw() */
+	if (trproc->rsc_table)
+		return trproc->rsc_table;
+
+	rsc_table = tee_rproc_get_loaded_rsc_table(rproc, &table_sz);
+	if (IS_ERR(rsc_table))
+		return rsc_table;
+
+	rproc->table_sz = table_sz;
+	trproc->rsc_table = rsc_table;
+
+	return rsc_table;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table);
+
+int tee_rproc_start(struct rproc *rproc)
+{
+	struct tee_ioctl_invoke_arg arg;
+	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+	struct tee_rproc *trproc = rproc->tee_interface;
+	int ret;
+
+	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)
+			ret = -EIO;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_start);
+
+int tee_rproc_stop(struct rproc *rproc)
+{
+	struct tee_ioctl_invoke_arg arg;
+	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+	struct tee_rproc *trproc = rproc->tee_interface;
+	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;
+	}
+
+	if (!rproc->table_ptr)
+		return ret;
+
+	iounmap(trproc->rsc_table);
+	trproc->rsc_table = NULL;
+	rproc->table_ptr = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_stop);
+
+static const struct tee_client_device_id stm32_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_client_device *tee_device;
+	struct tee_ioctl_open_session_arg sess_arg;
+	struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+	struct tee_rproc *trproc;
+	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);
+
+	trproc =  devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
+	if (!trproc)
+		return ERR_PTR(-ENOMEM);
+
+	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);
+		return ERR_PTR(-EINVAL);
+	}
+
+	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;
+}
+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;
+
+	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_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);
+		if (entry->rsc_table)
+			iounmap(entry->rsc_table);
+		kfree(entry);
+	}
+
+	tee_client_close_context(tee_rproc_ctx->tee_ctx);
+
+	return 0;
+}
+
+MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
+
+static struct tee_client_driver tee_rproc_fw_driver = {
+	.id_table	= stm32_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(" TEE remote processor control driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index b4795698d8c2..8b678009e481 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h
new file mode 100644
index 000000000000..571e47190d02
--- /dev/null
+++ b/include/linux/tee_remoteproc.h
@@ -0,0 +1,112 @@ 
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
+ */
+
+#ifndef TEE_REMOTEPROC_H
+#define TEE_REMOTEPROC_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
+ * @rsc_table:		Resource table virtual address.
+ */
+struct tee_rproc {
+	struct list_head node;
+	struct rproc *rproc;
+	struct device *parent;
+	u32 rproc_id;
+	u32 session_id;
+	struct resource_table *rsc_table;
+};
+
+#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
+
+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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz);
+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_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return NULL;
+}
+
+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_TEE_REMOTEPROC */
+#endif /* TEE_REMOTEPROC_H */