Add a remoteproc TEE (Trusted Execution Environment) driver that will be probed by the TEE bus. If the associated Trusted application is supported on secure part this driver offers a client interface to load a firmware by the secure part. This firmware could be authenticated by the secure trusted application.
Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@foss.st.com --- Updates vs previous version: - rename tee_remoteproc.* file to rmeoteproc_tee.*, - rename TEE_REMOTEPROC config to REMOTEPROC_TEE, - remove "stm32" in some variable declarations, - remove useless "remoteproc_internal.h" include, - fix tee_rproc_ctx devm_kzalloc. - rework module description --- drivers/remoteproc/Kconfig | 10 + drivers/remoteproc/Makefile | 1 + drivers/remoteproc/remoteproc_tee.c | 446 ++++++++++++++++++++++++++++ include/linux/remoteproc.h | 4 + include/linux/remoteproc_tee.h | 100 +++++++ 5 files changed, 561 insertions(+) create mode 100644 drivers/remoteproc/remoteproc_tee.c create mode 100644 include/linux/remoteproc_tee.h
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index 48845dc8fa85..278f197acb90 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -365,6 +365,16 @@ config XLNX_R5_REMOTEPROC
It's safe to say N if not interested in using RPU r5f cores.
+ +config REMOTEPROC_TEE + tristate "Remoteproc support by a TEE application" + depends on OPTEE + help + Support a remote processor with a TEE application. The Trusted + Execution Context is responsible for loading the trusted firmware + image and managing the remote processor's lifecycle. + This can be either built-in or a loadable module. + endif # REMOTEPROC
endmenu diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile index 91314a9b43ce..b4eb37177005 100644 --- a/drivers/remoteproc/Makefile +++ b/drivers/remoteproc/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_RCAR_REMOTEPROC) += rcar_rproc.o obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o +obj-$(CONFIG_REMOTEPROC_TEE) += remoteproc_tee.o obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o diff --git a/drivers/remoteproc/remoteproc_tee.c b/drivers/remoteproc/remoteproc_tee.c new file mode 100644 index 000000000000..70cb67451767 --- /dev/null +++ b/drivers/remoteproc/remoteproc_tee.c @@ -0,0 +1,446 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) STMicroelectronics 2024 + * Author: Arnaud Pouliquen arnaud.pouliquen@foss.st.com + */ + +#include <linux/firmware.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/remoteproc.h> +#include <linux/remoteproc_tee.h> +#include <linux/slab.h> +#include <linux/tee_drv.h> + +#define MAX_TEE_PARAM_ARRY_MEMBER 4 + +/* + * Authentication of the firmware and load in the remote processor memory + * + * [in] params[0].value.a: unique 32bit identifier of the remote processor + * [in] params[1].memref: buffer containing the image of the buffer + */ +#define TA_RPROC_FW_CMD_LOAD_FW 1 + +/* + * Start the remote processor + * + * [in] params[0].value.a: unique 32bit identifier of the remote processor + */ +#define TA_RPROC_FW_CMD_START_FW 2 + +/* + * Stop the remote processor + * + * [in] params[0].value.a: unique 32bit identifier of the remote processor + */ +#define TA_RPROC_FW_CMD_STOP_FW 3 + +/* + * Return the address of the resource table, or 0 if not found + * No check is done to verify that the address returned is accessible by + * the non secure context. If the resource table is loaded in a protected + * memory the access by the non secure context will lead to a data abort. + * + * [in] params[0].value.a: unique 32bit identifier of the remote processor + * [out] params[1].value.a: 32bit LSB resource table memory address + * [out] params[1].value.b: 32bit MSB resource table memory address + * [out] params[2].value.a: 32bit LSB resource table memory size + * [out] params[2].value.b: 32bit MSB resource table memory size + */ +#define TA_RPROC_FW_CMD_GET_RSC_TABLE 4 + +/* + * Return the address of the core dump + * + * [in] params[0].value.a: unique 32bit identifier of the remote processor + * [out] params[1].memref: address of the core dump image if exist, + * else return Null + */ +#define TA_RPROC_FW_CMD_GET_COREDUMP 5 + +struct tee_rproc_context { + struct list_head sessions; + struct tee_context *tee_ctx; + struct device *dev; +}; + +static struct tee_rproc_context *tee_rproc_ctx; + +static void tee_rproc_prepare_args(struct tee_rproc *trproc, int cmd, + struct tee_ioctl_invoke_arg *arg, + struct tee_param *param, + unsigned int num_params) +{ + memset(arg, 0, sizeof(*arg)); + memset(param, 0, MAX_TEE_PARAM_ARRY_MEMBER * sizeof(*param)); + + arg->func = cmd; + arg->session = trproc->session_id; + arg->num_params = num_params + 1; + + param[0] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + .u.value.a = trproc->rproc_id, + }; +} + +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw) +{ + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; + struct tee_rproc *trproc = rproc->tee_interface; + struct tee_ioctl_invoke_arg arg; + struct tee_shm *fw_shm; + int ret; + + if (!trproc) + return -EINVAL; + + fw_shm = tee_shm_register_kernel_buf(tee_rproc_ctx->tee_ctx, (void *)fw->data, fw->size); + if (IS_ERR(fw_shm)) + return PTR_ERR(fw_shm); + + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_LOAD_FW, &arg, param, 1); + + /* Provide the address of the firmware image */ + param[1] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT, + .u.memref = { + .shm = fw_shm, + .size = fw->size, + .shm_offs = 0, + }, + }; + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_FW_CMD_LOAD_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + ret = -EIO; + } + + tee_shm_free(fw_shm); + + return ret; +} +EXPORT_SYMBOL_GPL(tee_rproc_load_fw); + +static int tee_rproc_get_loaded_rsc_table(struct rproc *rproc, phys_addr_t *rsc_pa, + size_t *table_sz) +{ + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; + struct tee_rproc *trproc = rproc->tee_interface; + struct tee_ioctl_invoke_arg arg; + int ret; + + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_GET_RSC_TABLE, &arg, param, 2); + + param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_FW_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + return -EIO; + } + + *table_sz = param[2].u.value.a; + + if (*table_sz) + *rsc_pa = param[1].u.value.a; + else + *rsc_pa = 0; + + return 0; +} + +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw) +{ + phys_addr_t rsc_table; + void __iomem *rsc_va; + size_t table_sz; + int ret; + + ret = tee_rproc_load_fw(rproc, fw); + if (ret) + return ret; + + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz); + if (ret) + return ret; + + /* + * We assume here that the memory mapping is the same between the TEE and Linux kernel + * contexts. Else a new TEE remoteproc service could be needed to get a copy of the + * resource table + */ + rsc_va = ioremap_wc(rsc_table, table_sz); + if (IS_ERR_OR_NULL(rsc_va)) { + dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %pa+%zx\n", + &rsc_table, table_sz); + return -ENOMEM; + } + + /* + * Create a copy of the resource table to have the same behavior as the elf loader. + * This cached table will be used after the remoteproc stops to free resources, and for + * crash recovery to reapply the settings. + */ + rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz, GFP_KERNEL); + if (!rproc->cached_table) { + ret = -ENOMEM; + goto out; + } + + rproc->table_ptr = rproc->cached_table; + rproc->table_sz = table_sz; + +out: + iounmap(rsc_va); + return ret; +} +EXPORT_SYMBOL_GPL(tee_rproc_parse_fw); + +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc, + const struct firmware *fw) +{ + struct tee_rproc *trproc = rproc->tee_interface; + phys_addr_t rsc_table; + size_t table_sz; + int ret; + + if (!trproc) + return ERR_PTR(-EINVAL); + + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz); + if (ret) + return ERR_PTR(ret); + + rproc->table_sz = table_sz; + if (!table_sz) + return NULL; + + /* + * At this step the memory area that contains the resource table should have be declared + * in the remote proc platform driver and allocated by rproc_alloc_registered_carveouts(). + */ + return (struct resource_table *)rproc_pa_to_va(rproc, rsc_table, table_sz, NULL); +} +EXPORT_SYMBOL_GPL(tee_rproc_find_loaded_rsc_table); + +int tee_rproc_start(struct rproc *rproc) +{ + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; + struct tee_rproc *trproc = rproc->tee_interface; + struct tee_ioctl_invoke_arg arg; + int ret = 0; + + if (!trproc) + return -EINVAL; + + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_START_FW, &arg, param, 0); + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_FW_CMD_START_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + return -EIO; + } + + return 0; +} +EXPORT_SYMBOL_GPL(tee_rproc_start); + +int tee_rproc_stop(struct rproc *rproc) +{ + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; + struct tee_rproc *trproc = rproc->tee_interface; + struct tee_ioctl_invoke_arg arg; + int ret; + + if (!trproc) + return -EINVAL; + + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_STOP_FW, &arg, param, 0); + + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(tee_rproc_ctx->dev, + "TA_RPROC_FW_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n", + arg.ret, ret); + if (!ret) + ret = -EIO; + } + + return ret; +} +EXPORT_SYMBOL_GPL(tee_rproc_stop); + +static const struct tee_client_device_id tee_rproc_id_table[] = { + {UUID_INIT(0x80a4c275, 0x0a47, 0x4905, 0x82, 0x85, 0x14, 0x86, 0xa9, 0x77, 0x1a, 0x08)}, + {} +}; + +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, unsigned int rproc_id) +{ + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; + struct tee_ioctl_open_session_arg sess_arg; + struct tee_client_device *tee_device; + struct tee_rproc *trproc, *p_err; + int ret; + + /* + * Test if the device has been probed by the TEE bus. In case of failure, we ignore the + * reason. The bus could be not yet probed or the service not available in the secure + * firmware.The assumption in such a case is that the TEE remoteproc is not probed. + */ + if (!tee_rproc_ctx) + return ERR_PTR(-EPROBE_DEFER); + + /* Prevent tee rproc module from being removed */ + if (!try_module_get(THIS_MODULE)) { + dev_err(tee_rproc_ctx->dev, "can't get owner\n"); + return ERR_PTR(-ENODEV); + } + + trproc = devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL); + if (!trproc) { + p_err = ERR_PTR(-ENOMEM); + goto module_put; + } + tee_device = to_tee_client_device(tee_rproc_ctx->dev); + memset(&sess_arg, 0, sizeof(sess_arg)); + + memcpy(sess_arg.uuid, tee_device->id.uuid.b, TEE_IOCTL_UUID_LEN); + + sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL; + sess_arg.num_params = 1; + + param[0] = (struct tee_param) { + .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + .u.value.a = rproc_id, + }; + + ret = tee_client_open_session(tee_rproc_ctx->tee_ctx, &sess_arg, param); + if (ret < 0 || sess_arg.ret != 0) { + dev_err(dev, "tee_client_open_session failed, err: %x\n", sess_arg.ret); + p_err = ERR_PTR(-EINVAL); + goto module_put; + } + + trproc->parent = dev; + trproc->rproc_id = rproc_id; + trproc->session_id = sess_arg.session; + + trproc->rproc = rproc; + rproc->tee_interface = trproc; + + list_add_tail(&trproc->node, &tee_rproc_ctx->sessions); + + return trproc; + +module_put: + module_put(THIS_MODULE); + return p_err; +} +EXPORT_SYMBOL_GPL(tee_rproc_register); + +int tee_rproc_unregister(struct tee_rproc *trproc) +{ + struct rproc *rproc = trproc->rproc; + int ret; + + ret = tee_client_close_session(tee_rproc_ctx->tee_ctx, trproc->session_id); + if (ret < 0) + dev_err(trproc->parent, "tee_client_close_session failed, err: %x\n", ret); + + list_del(&trproc->node); + rproc->tee_interface = NULL; + + module_put(THIS_MODULE); + + return ret; +} +EXPORT_SYMBOL_GPL(tee_rproc_unregister); + +static int tee_rproc_ctx_match(struct tee_ioctl_version_data *ver, const void *data) +{ + /* Today we support only the OP-TEE, could be extend to other tees */ + return (ver->impl_id == TEE_IMPL_ID_OPTEE); +} + +static int tee_rproc_probe(struct device *dev) +{ + struct tee_context *tee_ctx; + int ret; + + /* Open context with TEE driver */ + tee_ctx = tee_client_open_context(NULL, tee_rproc_ctx_match, NULL, NULL); + if (IS_ERR(tee_ctx)) + return PTR_ERR(tee_ctx); + + tee_rproc_ctx = devm_kzalloc(dev, sizeof(*tee_rproc_ctx), GFP_KERNEL); + if (!tee_rproc_ctx) { + ret = -ENOMEM; + goto err; + } + + tee_rproc_ctx->dev = dev; + tee_rproc_ctx->tee_ctx = tee_ctx; + INIT_LIST_HEAD(&tee_rproc_ctx->sessions); + + return 0; +err: + tee_client_close_context(tee_ctx); + + return ret; +} + +static int tee_rproc_remove(struct device *dev) +{ + struct tee_rproc *entry, *tmp; + + list_for_each_entry_safe(entry, tmp, &tee_rproc_ctx->sessions, node) { + tee_client_close_session(tee_rproc_ctx->tee_ctx, entry->session_id); + list_del(&entry->node); + kfree(entry); + } + + tee_client_close_context(tee_rproc_ctx->tee_ctx); + + return 0; +} + +MODULE_DEVICE_TABLE(tee, tee_rproc_id_table); + +static struct tee_client_driver tee_rproc_fw_driver = { + .id_table = tee_rproc_id_table, + .driver = { + .name = KBUILD_MODNAME, + .bus = &tee_bus_type, + .probe = tee_rproc_probe, + .remove = tee_rproc_remove, + }, +}; + +static int __init tee_rproc_fw_mod_init(void) +{ + return driver_register(&tee_rproc_fw_driver.driver); +} + +static void __exit tee_rproc_fw_mod_exit(void) +{ + driver_unregister(&tee_rproc_fw_driver.driver); +} + +module_init(tee_rproc_fw_mod_init); +module_exit(tee_rproc_fw_mod_exit); + +MODULE_DESCRIPTION(" remote processor support with a TEE application"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index 8fd0d7f63c8e..fbe1d6793709 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -503,6 +503,8 @@ enum rproc_features { RPROC_MAX_FEATURES, };
+struct tee_rproc; + /** * struct rproc - represents a physical remote processor device * @node: list node of this rproc object @@ -545,6 +547,7 @@ enum rproc_features { * @cdev: character device of the rproc * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release * @features: indicate remoteproc features + * @tee_interface: pointer to the remoteproc tee context */ struct rproc { struct list_head node; @@ -586,6 +589,7 @@ struct rproc { struct cdev cdev; bool cdev_put_on_release; DECLARE_BITMAP(features, RPROC_MAX_FEATURES); + struct tee_rproc *tee_interface; };
/** diff --git a/include/linux/remoteproc_tee.h b/include/linux/remoteproc_tee.h new file mode 100644 index 000000000000..ccf34a218d54 --- /dev/null +++ b/include/linux/remoteproc_tee.h @@ -0,0 +1,100 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright(c) 2024 STMicroelectronics + */ + +#ifndef REMOTEPROC_TEE_H +#define REMOTEPROC_TEE_H + +#include <linux/tee_drv.h> +#include <linux/firmware.h> +#include <linux/remoteproc.h> + +struct rproc; + +/** + * struct tee_rproc - TEE remoteproc structure + * @node: Reference in list + * @rproc: Remoteproc reference + * @parent: Parent device + * @rproc_id: Identifier of the target firmware + * @session_id: TEE session identifier + */ +struct tee_rproc { + struct list_head node; + struct rproc *rproc; + struct device *parent; + u32 rproc_id; + u32 session_id; +}; + +#if IS_REACHABLE(CONFIG_REMOTEPROC_TEE) + +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, + unsigned int rproc_id); +int tee_rproc_unregister(struct tee_rproc *trproc); +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw); +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw); +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc, + const struct firmware *fw); +int tee_rproc_start(struct rproc *rproc); +int tee_rproc_stop(struct rproc *rproc); + +#else + +static inline struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, + unsigned int rproc_id) +{ + return ERR_PTR(-ENODEV); +} + +static int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_unregister(struct tee_rproc *trproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_start(struct rproc *rproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline int tee_rproc_stop(struct rproc *rproc) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return 0; +} + +static inline struct resource_table * +tee_rproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return NULL; +} +#endif /* CONFIG_REMOTEPROC_TEE */ +#endif /* REMOTEPROC_TEE_H */