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Fri, 26 Jan 2024 14:39:34 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 6E94B2707EC; Fri, 26 Jan 2024 14:39:34 +0100 (CET) Received: from [10.252.25.40] (10.252.25.40) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Fri, 26 Jan 2024 14:39:33 +0100 Message-ID: Date: Fri, 26 Jan 2024 14:39:33 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] remoteproc: Add TEE support Content-Language: en-US To: Mathieu Poirier CC: Bjorn Andersson , Jens Wiklander , Rob Herring , Krzysztof Kozlowski , Conor Dooley , , , , , , References: <20240118100433.3984196-1-arnaud.pouliquen@foss.st.com> <20240118100433.3984196-2-arnaud.pouliquen@foss.st.com> From: Arnaud POULIQUEN Organization: STMicroelectronics In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: EQNCAS1NODE3.st.com (10.75.129.80) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-25_14,2024-01-25_01,2023-05-22_02 Hi Mathieu, On 1/25/24 19:55, Mathieu Poirier wrote: > Hi Arnaud, > > On Thu, Jan 18, 2024 at 11:04:30AM +0100, Arnaud Pouliquen wrote: >> From: Arnaud Pouliquen >> >> Add a remoteproc TEE (Trusted Execution Environment) device > > Device or driver? Seems to be the latter... Right, driver is better > >> that will be probed by the TEE bus. If the associated Trusted >> application is supported on secure part this device offers a client >> interface to load a firmware in the secure part. >> This firmware could be authenticated and decrypted by the secure >> trusted application. >> >> Signed-off-by: Arnaud Pouliquen >> --- >> drivers/remoteproc/Kconfig | 9 + >> drivers/remoteproc/Makefile | 1 + >> drivers/remoteproc/tee_remoteproc.c | 393 ++++++++++++++++++++++++++++ >> include/linux/tee_remoteproc.h | 99 +++++++ >> 4 files changed, 502 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..85299606806c 100644 >> --- a/drivers/remoteproc/Kconfig >> +++ b/drivers/remoteproc/Kconfig >> @@ -365,6 +365,15 @@ config XLNX_R5_REMOTEPROC >> >> It's safe to say N if not interested in using RPU r5f cores. >> >> + >> +config TEE_REMOTEPROC >> + tristate "trusted firmware support by a TEE application" >> + depends on OPTEE >> + help >> + Support for trusted remote processors firmware. The firmware >> + authentication and/or decryption are managed by a trusted application. >> + 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..49e1e0caf889 >> --- /dev/null >> +++ b/drivers/remoteproc/tee_remoteproc.c >> @@ -0,0 +1,393 @@ >> +// SPDX-License-Identifier: GPL-2.0-or-later >> +/* >> + * Copyright (C) STMicroelectronics 2023 - All Rights Reserved >> + * Author: Arnaud Pouliquen >> + */ >> + >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> + >> +#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_mem { >> + char name[20]; >> + void __iomem *cpu_addr; >> + phys_addr_t bus_addr; >> + u32 dev_addr; >> + size_t size; >> +}; >> + >> +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 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 tee_rproc *trproc, const struct firmware *fw) >> +{ >> + struct tee_ioctl_invoke_arg arg; >> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; >> + struct tee_shm *fw_shm; >> + int ret; >> + >> + 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); >> + >> + 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); >> + >> +int rproc_tee_get_rsc_table(struct tee_rproc *trproc) >> +{ >> + struct tee_ioctl_invoke_arg arg; >> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; >> + struct rproc *rproc = trproc->rproc; >> + size_t rsc_size; >> + int ret; >> + >> + 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; >> + } >> + >> + rsc_size = param[2].u.value.a; >> + >> + /* If the size is null no resource table defined in the image */ >> + if (!rsc_size) >> + return 0; >> + >> + /* Store the resource table address that would be updated by the remote core . */ >> + trproc->rsc_va = ioremap_wc(param[1].u.value.a, rsc_size); >> + if (IS_ERR_OR_NULL(trproc->rsc_va)) { >> + dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %lld+%zx\n", >> + param[1].u.value.a, rsc_size); >> + trproc->rsc_va = NULL; >> + return -ENOMEM; >> + } >> + >> + /* >> + * A cached table is requested as the physical address is not mapped yet >> + * but remoteproc needs to parse the table for resources. >> + */ >> + rproc->cached_table = kmemdup((__force void *)trproc->rsc_va, rsc_size, GFP_KERNEL); >> + if (!rproc->cached_table) >> + return -ENOMEM; >> + >> + rproc->table_ptr = rproc->cached_table; >> + rproc->table_sz = rsc_size; >> + >> + return 0; >> +} >> +EXPORT_SYMBOL_GPL(rproc_tee_get_rsc_table); >> + >> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc) >> +{ >> + return (__force struct resource_table *)trproc->rsc_va; >> +} >> +EXPORT_SYMBOL_GPL(tee_rproc_get_loaded_rsc_table); >> + >> +int tee_rproc_start(struct tee_rproc *trproc) >> +{ >> + struct tee_ioctl_invoke_arg arg; >> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; >> + int ret; >> + >> + 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 tee_rproc *trproc) >> +{ >> + struct tee_ioctl_invoke_arg arg; >> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER]; >> + int ret; >> + >> + 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 (trproc->rsc_va) >> + iounmap(trproc->rsc_va); >> + trproc->rsc_va = NULL; >> + >> + return ret; >> +} >> +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, unsigned int rproc_id) >> +{ >> + struct tee_client_device *rproc_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; >> + >> + /* >> + * The device is not probed by the TEE bus. We ignore the reason (bus could be not yet >> + * probed or service not available in the secure firmware) >> + * Assumption here is that the TEE bus 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); >> + >> + rproc_tee_device = to_tee_client_device(tee_rproc_ctx->dev); >> + memset(&sess_arg, 0, sizeof(sess_arg)); >> + >> + /* Open session with rproc_tee load the OP-TEE Trusted Application */ >> + memcpy(sess_arg.uuid, rproc_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; >> + >> + list_add_tail(&trproc->node, &tee_rproc_ctx->sessions); >> + >> + return trproc; >> +} >> +EXPORT_SYMBOL_GPL(tee_rproc_register); >> + >> +int tee_rproc_unregister(struct tee_rproc *trproc) >> +{ >> + int ret; >> + >> + if (!tee_rproc_ctx) >> + return -ENODEV; >> + >> + 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); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(tee_rproc_unregister); >> + >> +static int tee_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; >> + >> + /* Only one RPROC OP-TEE device allowed */ >> + if (tee_rproc_ctx) { >> + dev_err(dev, "An RPROC OP-TEE device was already initialized: only one allowed\n"); >> + return -EBUSY; >> + } >> + >> + /* Open context with TEE driver */ >> + tee_ctx = tee_client_open_context(NULL, tee_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_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, 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/tee_remoteproc.h b/include/linux/tee_remoteproc.h >> new file mode 100644 >> index 000000000000..537d6dc3b858 >> --- /dev/null >> +++ b/include/linux/tee_remoteproc.h >> @@ -0,0 +1,99 @@ >> +/* SPDX-License-Identifier: GPL-2.0-or-later */ >> +/* >> + * Copyright(c) 2023 STMicroelectronics - All Rights Reserved >> + */ >> + >> +#ifndef TEE_REMOTEPROC_H >> +#define TEE_REMOTEPROC_H >> + >> +#include >> +#include >> + >> +/** >> + * 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_va: Resource table virtual address. >> + */ >> +struct tee_rproc { >> + struct list_head node; >> + struct rproc *rproc; >> + struct device *parent; >> + u32 rproc_id; >> + u32 session_id; >> + void __iomem *rsc_va; >> +}; >> + >> +#if IS_ENABLED(CONFIG_TEE_REMOTEPROC) >> + >> +struct tee_rproc *tee_rproc_register(struct device *dev, unsigned int rproc_id); >> +int tee_rproc_unregister(struct tee_rproc *trproc); >> + >> +int tee_rproc_load_fw(struct tee_rproc *trproc, const struct firmware *fw); >> +int rproc_tee_get_rsc_table(struct tee_rproc *trproc); > > Shouldn't this be tee_rproc_get_rsc_table()? Why the exception? No reason, just a miss during concatenation of patches to prepare the series. I will change this. > >> +struct resource_table *tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc); >> +int tee_rproc_start(struct tee_rproc *trproc); >> +int tee_rproc_stop(struct tee_rproc *trproc); >> + >> +#else >> + >> +static inline struct tee_rproc *tee_rproc_register(struct device *dev, unsigned int rproc_id) >> +{ >> + return ERR_PTR(-ENODEV); >> +} >> + >> +static inline int tee_rproc_unregister(struct tee_rproc *trproc) >> +{ >> + /* This shouldn't be possible */ > > Why can't this be possible? Looking at the Kconfig file it seems entirely > plausible to compile stm32_rproc without TEE_REMOTEPROC... This sentence is copied from rpmsg.h [1]. It is not possible to call the API if the TEE_REMOTEPROC is not set, as an error is returned by tee_rproc_register. Therefore, we should not fall into a state where we call this API or another one. [1]https://elixir.bootlin.com/linux/v6.7.1/source/include/linux/rpmsg.h#L218 Thanks, Arnaud > > More comments to come tomorrow or on Monday. > > Thanks, > Mathieu > >> + WARN_ON(1); >> + >> + return 0; >> +} >> + >> +static inline int tee_rproc_load_fw(struct tee_rproc *trproc, >> + const struct firmware *fw) >> +{ >> + /* This shouldn't be possible */ >> + WARN_ON(1); >> + >> + return 0; >> +} >> + >> +static inline int tee_rproc_start(struct tee_rproc *trproc) >> +{ >> + /* This shouldn't be possible */ >> + WARN_ON(1); >> + >> + return 0; >> +} >> + >> +static inline int tee_rproc_stop(struct tee_rproc *trproc) >> +{ >> + /* This shouldn't be possible */ >> + WARN_ON(1); >> + >> + return 0; >> +} >> + >> +static inline int rproc_tee_get_rsc_table(struct tee_rproc *trproc) >> +{ >> + /* This shouldn't be possible */ >> + WARN_ON(1); >> + >> + return 0; >> +} >> + >> +static inline struct resource_table * >> + tee_rproc_get_loaded_rsc_table(struct tee_rproc *trproc) >> +{ >> + /* This shouldn't be possible */ >> + WARN_ON(1); >> + >> + return NULL; >> +} >> + >> +#endif /* CONFIG_TEE_REMOTEPROC */ >> +#endif /* TEE_REMOTEPROC_H */ >> -- >> 2.25.1 >>