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 arnaud.pouliquen@foss.st.com

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 arnaud.pouliquen@foss.st.com
• */

+#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

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 arnaud.pouliquen@foss.st.com

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 arnaud.pouliquen@foss.st.com
• */

+#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... [2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc...

...

...

• 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

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 arnaud.pouliquen@foss.st.com

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 arnaud.pouliquen@foss.st.com
• */

+#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...

...

...

...

...

• 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... [2]https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc...

...

...

• 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

On Fri, Mar 08, 2024 at 03:47:08PM +0100, Arnaud Pouliquen wrote:

The new TEE remoteproc device is used to manage remote firmware in a secure, trusted context. The 'st,stm32mp1-m4-tee' compatibility is introduced to delegate the loading of the firmware to the trusted execution context. In such cases, the firmware should be signed and adhere to the image format defined by the TEE.

Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@foss.st.com

Updates from V3:

• remove support of the attach use case. Will be addressed in a separate thread,
• add st_rproc_tee_ops::parse_fw ops,
• inverse call of devm_rproc_alloc()and tee_rproc_register() to manage cross reference between the rproc struct and the tee_rproc struct in tee_rproc.c.

---

drivers/remoteproc/stm32_rproc.c | 60 +++++++++++++++++++++++++++++--- 1 file changed, 56 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index 8cd838df4e92..13df33c78aa2 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -20,6 +20,7 @@ #include <linux/remoteproc.h> #include <linux/reset.h> #include <linux/slab.h> +#include <linux/tee_remoteproc.h> #include <linux/workqueue.h> #include "remoteproc_internal.h" @@ -49,6 +50,9 @@ #define M4_STATE_STANDBY 4 #define M4_STATE_CRASH 5 +/* Remote processor unique identifier aligned with the Trusted Execution Environment definitions */

Why is this the case? At least from the kernel side it is possible to call tee_rproc_register() with any kind of value, why is there a need to be any kind of alignment with the TEE?

+#define STM32_MP1_M4_PROC_ID 0

struct stm32_syscon { struct regmap *map; u32 reg; @@ -257,6 +261,19 @@ static int stm32_rproc_release(struct rproc *rproc) return 0; } +static int stm32_rproc_tee_stop(struct rproc *rproc) +{

• int err;
• stm32_rproc_request_shutdown(rproc);
• err = tee_rproc_stop(rproc);
• if (err)

• return err;
  

• return stm32_rproc_release(rproc);

+}

static int stm32_rproc_prepare(struct rproc *rproc) { struct device *dev = rproc->dev.parent; @@ -693,8 +710,19 @@ static const struct rproc_ops st_rproc_ops = { .get_boot_addr = rproc_elf_get_boot_addr, }; +static const struct rproc_ops st_rproc_tee_ops = {

• .prepare = stm32_rproc_prepare,
• .start = tee_rproc_start,
• .stop = stm32_rproc_tee_stop,
• .kick = stm32_rproc_kick,
• .load = tee_rproc_load_fw,
• .parse_fw = tee_rproc_parse_fw,
• .find_loaded_rsc_table = tee_rproc_find_loaded_rsc_table,

+};

static const struct of_device_id stm32_rproc_match[] = {

• { .compatible = "st,stm32mp1-m4" },

• {.compatible = "st,stm32mp1-m4",},
• {.compatible = "st,stm32mp1-m4-tee",}, {},

}; MODULE_DEVICE_TABLE(of, stm32_rproc_match); @@ -853,6 +881,7 @@ static int stm32_rproc_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct stm32_rproc *ddata; struct device_node *np = dev->of_node;

• struct tee_rproc *trproc = NULL; struct rproc *rproc; unsigned int state; int ret;

@@ -861,9 +890,26 @@ static int stm32_rproc_probe(struct platform_device *pdev) if (ret) return ret;

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
• if (!rproc)

• return -ENOMEM;
  

• if (of_device_is_compatible(np, "st,stm32mp1-m4-tee")) {

• /*
  

•  * Delegate the firmware management to the secure context.
  

•  * The firmware loaded has to be signed.
  

•  */
  

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_tee_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• trproc = tee_rproc_register(dev, rproc, STM32_MP1_M4_PROC_ID);
  

• if (IS_ERR(trproc)) {
  

• 	dev_err_probe(dev, PTR_ERR(trproc),
  

• 		      "signed firmware not supported by TEE\n");
  

• 	return PTR_ERR(trproc);
  

• }
  

• } else {

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• }

ddata = rproc->priv; @@ -915,6 +961,9 @@ static int stm32_rproc_probe(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (trproc)

if (rproc->tee_interface)

I am done reviewing this set.

Thanks, Mathieu

• tee_rproc_unregister(trproc);
  

• return ret;

} @@ -935,6 +984,9 @@ static void stm32_rproc_remove(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (rproc->tee_interface)

• tee_rproc_unregister(rproc->tee_interface);
  

} static int stm32_rproc_suspend(struct device *dev) -- 2.25.1

On Tue, Mar 26, 2024 at 08:31:33PM +0100, Arnaud POULIQUEN wrote:

On 3/25/24 17:51, Mathieu Poirier wrote:

...

On Fri, Mar 08, 2024 at 03:47:08PM +0100, Arnaud Pouliquen wrote:

...

The new TEE remoteproc device is used to manage remote firmware in a secure, trusted context. The 'st,stm32mp1-m4-tee' compatibility is introduced to delegate the loading of the firmware to the trusted execution context. In such cases, the firmware should be signed and adhere to the image format defined by the TEE.

Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@foss.st.com

Updates from V3:

• remove support of the attach use case. Will be addressed in a separate thread,
• add st_rproc_tee_ops::parse_fw ops,
• inverse call of devm_rproc_alloc()and tee_rproc_register() to manage cross reference between the rproc struct and the tee_rproc struct in tee_rproc.c.

---

drivers/remoteproc/stm32_rproc.c | 60 +++++++++++++++++++++++++++++--- 1 file changed, 56 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index 8cd838df4e92..13df33c78aa2 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -20,6 +20,7 @@ #include <linux/remoteproc.h> #include <linux/reset.h> #include <linux/slab.h> +#include <linux/tee_remoteproc.h> #include <linux/workqueue.h> #include "remoteproc_internal.h" @@ -49,6 +50,9 @@ #define M4_STATE_STANDBY 4 #define M4_STATE_CRASH 5 +/* Remote processor unique identifier aligned with the Trusted Execution Environment definitions */

Why is this the case? At least from the kernel side it is possible to call tee_rproc_register() with any kind of value, why is there a need to be any kind of alignment with the TEE?

The use of the proc_id is to identify a processor in case of multi co-processors.

That is well understood.

For instance we can have a system with A DSP and a modem. We would use the same TEE service, but

That too.

the TEE driver will probably be different, same for the signature key.

What TEE driver are we talking about here?

In such case the proc ID allows to identify the the processor you want to address.

That too is well understood, but there is no alignment needed with the TEE, i.e the TEE application is not expecting a value of '0'. We could set STM32_MP1_M4_PROC_ID to 0xDEADBEEF and things would work. This driver won't go anywhere for as long as it is not the case.

...

...

+#define STM32_MP1_M4_PROC_ID 0

struct stm32_syscon { struct regmap *map; u32 reg; @@ -257,6 +261,19 @@ static int stm32_rproc_release(struct rproc *rproc) return 0; } +static int stm32_rproc_tee_stop(struct rproc *rproc) +{

• int err;
• stm32_rproc_request_shutdown(rproc);
• err = tee_rproc_stop(rproc);
• if (err)

• return err;
  

• return stm32_rproc_release(rproc);

+}

static int stm32_rproc_prepare(struct rproc *rproc) { struct device *dev = rproc->dev.parent; @@ -693,8 +710,19 @@ static const struct rproc_ops st_rproc_ops = { .get_boot_addr = rproc_elf_get_boot_addr, }; +static const struct rproc_ops st_rproc_tee_ops = {

• .prepare = stm32_rproc_prepare,
• .start = tee_rproc_start,
• .stop = stm32_rproc_tee_stop,
• .kick = stm32_rproc_kick,
• .load = tee_rproc_load_fw,
• .parse_fw = tee_rproc_parse_fw,
• .find_loaded_rsc_table = tee_rproc_find_loaded_rsc_table,

+};

static const struct of_device_id stm32_rproc_match[] = {

• { .compatible = "st,stm32mp1-m4" },

• {.compatible = "st,stm32mp1-m4",},
• {.compatible = "st,stm32mp1-m4-tee",}, {},

}; MODULE_DEVICE_TABLE(of, stm32_rproc_match); @@ -853,6 +881,7 @@ static int stm32_rproc_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct stm32_rproc *ddata; struct device_node *np = dev->of_node;

• struct tee_rproc *trproc = NULL; struct rproc *rproc; unsigned int state; int ret;

@@ -861,9 +890,26 @@ static int stm32_rproc_probe(struct platform_device *pdev) if (ret) return ret;

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
• if (!rproc)

• return -ENOMEM;
  

• if (of_device_is_compatible(np, "st,stm32mp1-m4-tee")) {

• /*
  

•  * Delegate the firmware management to the secure context.
  

•  * The firmware loaded has to be signed.
  

•  */
  

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_tee_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• trproc = tee_rproc_register(dev, rproc, STM32_MP1_M4_PROC_ID);
  

• if (IS_ERR(trproc)) {
  

• 	dev_err_probe(dev, PTR_ERR(trproc),
  

• 		      "signed firmware not supported by TEE\n");
  

• 	return PTR_ERR(trproc);
  

• }
  

• } else {

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• }

ddata = rproc->priv; @@ -915,6 +961,9 @@ static int stm32_rproc_probe(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (trproc)

    if (rproc->tee_interface)

I am done reviewing this set.

Thank for your review! Arnaud

...

Thanks, Mathieu

...

• tee_rproc_unregister(trproc);
  

• return ret;

} @@ -935,6 +984,9 @@ static void stm32_rproc_remove(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (rproc->tee_interface)

• tee_rproc_unregister(rproc->tee_interface);
  

} static int stm32_rproc_suspend(struct device *dev) -- 2.25.1

On Fri, Mar 29, 2024 at 11:57:43AM +0100, Arnaud POULIQUEN wrote:

On 3/27/24 18:14, Mathieu Poirier wrote:

...

On Tue, Mar 26, 2024 at 08:31:33PM +0100, Arnaud POULIQUEN wrote:

...

On 3/25/24 17:51, Mathieu Poirier wrote:

...

On Fri, Mar 08, 2024 at 03:47:08PM +0100, Arnaud Pouliquen wrote:

...

The new TEE remoteproc device is used to manage remote firmware in a secure, trusted context. The 'st,stm32mp1-m4-tee' compatibility is introduced to delegate the loading of the firmware to the trusted execution context. In such cases, the firmware should be signed and adhere to the image format defined by the TEE.

Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@foss.st.com

Updates from V3:

• remove support of the attach use case. Will be addressed in a separate thread,
• add st_rproc_tee_ops::parse_fw ops,
• inverse call of devm_rproc_alloc()and tee_rproc_register() to manage cross reference between the rproc struct and the tee_rproc struct in tee_rproc.c.

---

drivers/remoteproc/stm32_rproc.c | 60 +++++++++++++++++++++++++++++--- 1 file changed, 56 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index 8cd838df4e92..13df33c78aa2 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -20,6 +20,7 @@ #include <linux/remoteproc.h> #include <linux/reset.h> #include <linux/slab.h> +#include <linux/tee_remoteproc.h> #include <linux/workqueue.h> #include "remoteproc_internal.h" @@ -49,6 +50,9 @@ #define M4_STATE_STANDBY 4 #define M4_STATE_CRASH 5 +/* Remote processor unique identifier aligned with the Trusted Execution Environment definitions */

Why is this the case? At least from the kernel side it is possible to call tee_rproc_register() with any kind of value, why is there a need to be any kind of alignment with the TEE?

The use of the proc_id is to identify a processor in case of multi co-processors.

That is well understood.

...

For instance we can have a system with A DSP and a modem. We would use the same TEE service, but

That too.

...

the TEE driver will probably be different, same for the signature key.

What TEE driver are we talking about here?

In OP-TEE remoteproc frameork is divided in 2 or 3 layers:

• the remoteproc Trusted Application (TA) [1] which is platform agnostic
• The remoteproc Pseudo Trusted Application (PTA) [2] which is platform

dependent and can rely on the proc ID to retrieve the context.

• the remoteproc driver (optional for some platforms) [3], which is in charge

of DT parsing and platform configuration.

That part makes sense.

Here TEE driver can be interpreted by remote PTA and/or platform driver.

I have to guess PTA means "Platform Trusted Application" but I have no guarantee, adding to the level of (already high) confusion brought on by this patchset.

[1] https://elixir.bootlin.com/op-tee/latest/source/ta/remoteproc/src/remoteproc... [2] https://elixir.bootlin.com/op-tee/latest/source/core/pta/stm32mp/remoteproc_... [3] https://elixir.bootlin.com/op-tee/latest/source/core/drivers/remoteproc/stm3...

...

...

In such case the proc ID allows to identify the the processor you want to address.

That too is well understood, but there is no alignment needed with the TEE, i.e the TEE application is not expecting a value of '0'. We could set STM32_MP1_M4_PROC_ID to 0xDEADBEEF and things would work. This driver won't go anywhere for as long as it is not the case.

Here I suppose that you do not challenge the rproc_ID use in general, but for the stm32mp1 platform as we have only one remote processor. I'm right?

That is correct - I understand the need for an rproc_ID. The problem is with the comment that states that '0' is aligned with the TEE definitions, which in my head means hard coded value and a big red flag. What it should say is "aligned with the TEE device tree definition".

In OP-TEE the check is done here: https://elixir.bootlin.com/op-tee/latest/source/core/drivers/remoteproc/stm3...

If driver does not register the proc ID an error is returned indicating that the feature is not supported.

In case of stm32mp1 yes we could consider it as useless as we have only one remote proc.

Nevertheless I can not guaranty that a customer will not add an external companion processor that uses OP-TEE to authenticate the associated firmware. As the trusted Application is the unique entry point. he will need the proc_id to identify the target at PTA level.

So from my point of view having a proc ID on stm32MP1 (and on stm32mp2 that will reuse same driver) aligned between Linux and OP-TEE is useful.

I agree, for as long as it is not hard coded. The way remote processors are discovered in the DT is perfectly acceptable, i.e the first remote processor is for application X, the second for application Y...

That said using a TEE_REMOTEPROC_DEFAULT_ID is something that could be more generic (for linux and OP-TEE). This ID could be reuse in the stm32mp driver and platform drivers with an unique internal remote processor.

I can't find the definition of TEE_REMOTEPROC_DEFAULT_ID anywhere, something that doesn't help the confusion I referred to above.

It that solution would be ok for you?

Regards, Arnaud

...

...

...

...

+#define STM32_MP1_M4_PROC_ID 0

struct stm32_syscon { struct regmap *map; u32 reg; @@ -257,6 +261,19 @@ static int stm32_rproc_release(struct rproc *rproc) return 0; } +static int stm32_rproc_tee_stop(struct rproc *rproc) +{

• int err;
• stm32_rproc_request_shutdown(rproc);
• err = tee_rproc_stop(rproc);
• if (err)

• return err;
  

• return stm32_rproc_release(rproc);

+}

static int stm32_rproc_prepare(struct rproc *rproc) { struct device *dev = rproc->dev.parent; @@ -693,8 +710,19 @@ static const struct rproc_ops st_rproc_ops = { .get_boot_addr = rproc_elf_get_boot_addr, }; +static const struct rproc_ops st_rproc_tee_ops = {

• .prepare = stm32_rproc_prepare,
• .start = tee_rproc_start,
• .stop = stm32_rproc_tee_stop,
• .kick = stm32_rproc_kick,
• .load = tee_rproc_load_fw,
• .parse_fw = tee_rproc_parse_fw,
• .find_loaded_rsc_table = tee_rproc_find_loaded_rsc_table,

+};

static const struct of_device_id stm32_rproc_match[] = {

• { .compatible = "st,stm32mp1-m4" },

• {.compatible = "st,stm32mp1-m4",},
• {.compatible = "st,stm32mp1-m4-tee",}, {},

}; MODULE_DEVICE_TABLE(of, stm32_rproc_match); @@ -853,6 +881,7 @@ static int stm32_rproc_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct stm32_rproc *ddata; struct device_node *np = dev->of_node;

• struct tee_rproc *trproc = NULL; struct rproc *rproc; unsigned int state; int ret;

@@ -861,9 +890,26 @@ static int stm32_rproc_probe(struct platform_device *pdev) if (ret) return ret;

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
• if (!rproc)

• return -ENOMEM;
  

• if (of_device_is_compatible(np, "st,stm32mp1-m4-tee")) {

• /*
  

•  * Delegate the firmware management to the secure context.
  

•  * The firmware loaded has to be signed.
  

•  */
  

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_tee_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• trproc = tee_rproc_register(dev, rproc, STM32_MP1_M4_PROC_ID);
  

• if (IS_ERR(trproc)) {
  

• 	dev_err_probe(dev, PTR_ERR(trproc),
  

• 		      "signed firmware not supported by TEE\n");
  

• 	return PTR_ERR(trproc);
  

• }
  

• } else {

• rproc = devm_rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
  

• if (!rproc)
  

• 	return -ENOMEM;
  

• }

ddata = rproc->priv; @@ -915,6 +961,9 @@ static int stm32_rproc_probe(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (trproc)

    if (rproc->tee_interface)

I am done reviewing this set.

Thank for your review! Arnaud

...

Thanks, Mathieu

...

• tee_rproc_unregister(trproc);
  

• return ret;

} @@ -935,6 +984,9 @@ static void stm32_rproc_remove(struct platform_device *pdev) dev_pm_clear_wake_irq(dev); device_init_wakeup(dev, false); }

• if (rproc->tee_interface)

• tee_rproc_unregister(rproc->tee_interface);
  

} static int stm32_rproc_suspend(struct device *dev) -- 2.25.1