From nobody Sun Feb 8 10:49:17 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 150181B95F; Fri, 23 Feb 2024 09:52:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681974; cv=none; b=jL5OfCJxxV8mKFR0hJNp6SVJf7iBQEjBynHlh7IWCTyX/mTV2ZT4/HI/UvTRNtzd3qLU7EZwMImt7Rpy6phzKnWXLqjnyc/shc2/oIYpiXQrXhQdpHfzerwGyFTQAtuEdqWaWojUgt4xRKRtuSQYzLXST1fPOh/6SbY1Y0/vS2c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681974; c=relaxed/simple; bh=XLPkk1u0aO/hV7/6PIgQMT8TAmRH14d/xlPdiaGnEWs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Ue72ZEU4/IPt02jqNS8JpvDDKJAetU0KbUz3Ab/HTf0Rihx3CcOvLgy6C9k3n8baIi1i6uFyx5ZKbfQMQiAdmHSaWaIV+dQelwBvrM5Zbh2RBr4XAHgu83bx/f0ftOq9JgMyToRyXNnM68ws0+pU9Yjj5XDPqBq0PHj+Of5Hi6I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DE80615DB; Fri, 23 Feb 2024 01:53:24 -0800 (PST) Received: from mango.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 63D6B3F766; Fri, 23 Feb 2024 01:52:44 -0800 (PST) From: Balint Dobszay To: op-tee@lists.trustedfirmware.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: jens.wiklander@linaro.org, sumit.garg@linaro.org, corbet@lwn.net, balint.dobszay@arm.com, sudeep.holla@arm.com, rdunlap@infradead.org, krzk@kernel.org, gyorgy.szing@arm.com Subject: [PATCH v2 1/3] tee: optee: Move pool_op helper functions Date: Fri, 23 Feb 2024 10:51:31 +0100 Message-Id: <20240223095133.109046-2-balint.dobszay@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240223095133.109046-1-balint.dobszay@arm.com> References: <20240223095133.109046-1-balint.dobszay@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the pool alloc and free helper functions from the OP-TEE driver to the TEE subsystem, since these could be reused in other TEE drivers. This patch is not supposed to change behavior, it's only reorganizing the code. Suggested-by: Jens Wiklander Signed-off-by: Balint Dobszay --- drivers/tee/optee/core.c | 64 ------------------------------ drivers/tee/optee/ffa_abi.c | 6 +-- drivers/tee/optee/optee_private.h | 12 ------ drivers/tee/optee/smc_abi.c | 11 +++--- drivers/tee/tee_shm.c | 65 +++++++++++++++++++++++++++++++ include/linux/tee_drv.h | 11 ++++++ 6 files changed, 85 insertions(+), 84 deletions(-) diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index 3aed554bc8d8..9390f21f9902 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -9,7 +9,6 @@ #include #include #include -#include #include #include #include @@ -17,69 +16,6 @@ #include #include "optee_private.h" =20 -int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *= shm, - size_t size, size_t align, - int (*shm_register)(struct tee_context *ctx, - struct tee_shm *shm, - struct page **pages, - size_t num_pages, - unsigned long start)) -{ - size_t nr_pages =3D roundup(size, PAGE_SIZE) / PAGE_SIZE; - struct page **pages; - unsigned int i; - int rc =3D 0; - - /* - * Ignore alignment since this is already going to be page aligned - * and there's no need for any larger alignment. - */ - shm->kaddr =3D alloc_pages_exact(nr_pages * PAGE_SIZE, - GFP_KERNEL | __GFP_ZERO); - if (!shm->kaddr) - return -ENOMEM; - - shm->paddr =3D virt_to_phys(shm->kaddr); - shm->size =3D nr_pages * PAGE_SIZE; - - pages =3D kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL); - if (!pages) { - rc =3D -ENOMEM; - goto err; - } - - for (i =3D 0; i < nr_pages; i++) - pages[i] =3D virt_to_page((u8 *)shm->kaddr + i * PAGE_SIZE); - - shm->pages =3D pages; - shm->num_pages =3D nr_pages; - - if (shm_register) { - rc =3D shm_register(shm->ctx, shm, pages, nr_pages, - (unsigned long)shm->kaddr); - if (rc) - goto err; - } - - return 0; -err: - free_pages_exact(shm->kaddr, shm->size); - shm->kaddr =3D NULL; - return rc; -} - -void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *= shm, - int (*shm_unregister)(struct tee_context *ctx, - struct tee_shm *shm)) -{ - if (shm_unregister) - shm_unregister(shm->ctx, shm); - free_pages_exact(shm->kaddr, shm->size); - shm->kaddr =3D NULL; - kfree(shm->pages); - shm->pages =3D NULL; -} - static void optee_bus_scan(struct work_struct *work) { WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP)); diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c index ecb5eb079408..ee11918a2b35 100644 --- a/drivers/tee/optee/ffa_abi.c +++ b/drivers/tee/optee/ffa_abi.c @@ -374,14 +374,14 @@ static int optee_ffa_shm_unregister_supp(struct tee_c= ontext *ctx, static int pool_ffa_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm, size_t size, size_t align) { - return optee_pool_op_alloc_helper(pool, shm, size, align, - optee_ffa_shm_register); + return tee_shm_pool_op_alloc_helper(pool, shm, size, align, + optee_ffa_shm_register); } =20 static void pool_ffa_op_free(struct tee_shm_pool *pool, struct tee_shm *shm) { - optee_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister); + tee_shm_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister); } =20 static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool) diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_pr= ivate.h index 7a5243c78b55..a153285a1919 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -283,18 +283,6 @@ int optee_cancel_req(struct tee_context *ctx, u32 canc= el_id, u32 session); int optee_enumerate_devices(u32 func); void optee_unregister_devices(void); =20 -int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *= shm, - size_t size, size_t align, - int (*shm_register)(struct tee_context *ctx, - struct tee_shm *shm, - struct page **pages, - size_t num_pages, - unsigned long start)); -void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *= shm, - int (*shm_unregister)(struct tee_context *ctx, - struct tee_shm *shm)); - - void optee_remove_common(struct optee *optee); int optee_open(struct tee_context *ctx, bool cap_memref_null); void optee_release(struct tee_context *ctx); diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index a37f87087e5c..b0c616b6870d 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -592,19 +592,20 @@ static int pool_op_alloc(struct tee_shm_pool *pool, * to be registered with OP-TEE. */ if (shm->flags & TEE_SHM_PRIV) - return optee_pool_op_alloc_helper(pool, shm, size, align, NULL); + return tee_shm_pool_op_alloc_helper(pool, shm, size, align, + NULL); =20 - return optee_pool_op_alloc_helper(pool, shm, size, align, - optee_shm_register); + return tee_shm_pool_op_alloc_helper(pool, shm, size, align, + optee_shm_register); } =20 static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm) { if (!(shm->flags & TEE_SHM_PRIV)) - optee_pool_op_free_helper(pool, shm, optee_shm_unregister); + tee_shm_pool_op_free_helper(pool, shm, optee_shm_unregister); else - optee_pool_op_free_helper(pool, shm, NULL); + tee_shm_pool_op_free_helper(pool, shm, NULL); } =20 static void pool_op_destroy_pool(struct tee_shm_pool *pool) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 731d9028b67f..641aad92ffe2 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -202,6 +202,71 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_cont= ext *ctx, size_t size) } EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); =20 +int tee_shm_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm= *shm, + size_t size, size_t align, + int (*shm_register)(struct tee_context *ctx, + struct tee_shm *shm, + struct page **pages, + size_t num_pages, + unsigned long start)) +{ + size_t nr_pages =3D roundup(size, PAGE_SIZE) / PAGE_SIZE; + struct page **pages; + unsigned int i; + int rc =3D 0; + + /* + * Ignore alignment since this is already going to be page aligned + * and there's no need for any larger alignment. + */ + shm->kaddr =3D alloc_pages_exact(nr_pages * PAGE_SIZE, + GFP_KERNEL | __GFP_ZERO); + if (!shm->kaddr) + return -ENOMEM; + + shm->paddr =3D virt_to_phys(shm->kaddr); + shm->size =3D nr_pages * PAGE_SIZE; + + pages =3D kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL); + if (!pages) { + rc =3D -ENOMEM; + goto err; + } + + for (i =3D 0; i < nr_pages; i++) + pages[i] =3D virt_to_page((u8 *)shm->kaddr + i * PAGE_SIZE); + + shm->pages =3D pages; + shm->num_pages =3D nr_pages; + + if (shm_register) { + rc =3D shm_register(shm->ctx, shm, pages, nr_pages, + (unsigned long)shm->kaddr); + if (rc) + goto err; + } + + return 0; +err: + free_pages_exact(shm->kaddr, shm->size); + shm->kaddr =3D NULL; + return rc; +} +EXPORT_SYMBOL_GPL(tee_shm_pool_op_alloc_helper); + +void tee_shm_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm= *shm, + int (*shm_unregister)(struct tee_context *ctx, + struct tee_shm *shm)) +{ + if (shm_unregister) + shm_unregister(shm->ctx, shm); + free_pages_exact(shm->kaddr, shm->size); + shm->kaddr =3D NULL; + kfree(shm->pages); + shm->pages =3D NULL; +} +EXPORT_SYMBOL_GPL(tee_shm_pool_op_free_helper); + static struct tee_shm * register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 fl= ags, int id) diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 911ddf92dcee..4cf402424e71 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -275,6 +275,17 @@ void *tee_get_drvdata(struct tee_device *teedev); struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t siz= e); struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t s= ize); =20 +int tee_shm_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm= *shm, + size_t size, size_t align, + int (*shm_register)(struct tee_context *ctx, + struct tee_shm *shm, + struct page **pages, + size_t num_pages, + unsigned long start)); +void tee_shm_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm= *shm, + int (*shm_unregister)(struct tee_context *ctx, + struct tee_shm *shm)); + struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx, void *addr, size_t length); =20 --=20 2.34.1 From nobody Sun Feb 8 10:49:17 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 1719C5CDF2; Fri, 23 Feb 2024 09:52:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681979; cv=none; b=evuGTyS0x3LfZDAjqHQMfc94YYqKalkEdCbfZV8AyVr2Jhtu40E9yTno5RKpI4g6LBye3mS7U9MoS7KLjjJs0mQVrubMRXAzFiCyGocKsBCoGWzNJDRPwtlxqPKb/nyLOFGPpwCu0OsxBy1tI8RRU+crtmHjRetrUCiwlkg2Nyo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681979; c=relaxed/simple; bh=l4UzOYx7g8YM8e/OlJ4vfSDqbCqOVocYyBQkUMCW/qY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Qf4WDnWfYgkR8q7ZZPZSDqQdWe6xFbEHkKla+TS5GhgrLdq3wHYh1VTL89IWjWcE/JqH74jMX06DnD4ZaPfea8EVs/BLEbGxSQ1c/UiTd9RigJUfPnGvfWHf8fIAwSnuQnV2KSymx/ozFa9qMrufvY72udYPI81mEhbAQwiLzkM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 163D51596; Fri, 23 Feb 2024 01:53:35 -0800 (PST) Received: from mango.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 8F2A53F766; Fri, 23 Feb 2024 01:52:54 -0800 (PST) From: Balint Dobszay To: op-tee@lists.trustedfirmware.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: jens.wiklander@linaro.org, sumit.garg@linaro.org, corbet@lwn.net, balint.dobszay@arm.com, sudeep.holla@arm.com, rdunlap@infradead.org, krzk@kernel.org, gyorgy.szing@arm.com Subject: [PATCH v2 2/3] tee: tstee: Add Trusted Services TEE driver Date: Fri, 23 Feb 2024 10:51:32 +0100 Message-Id: <20240223095133.109046-3-balint.dobszay@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240223095133.109046-1-balint.dobszay@arm.com> References: <20240223095133.109046-1-balint.dobszay@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The Trusted Services project provides a framework for developing and deploying device Root of Trust services in FF-A Secure Partitions. The FF-A SPs are accessible through the FF-A driver, but this doesn't provide a user space interface. The goal of this TEE driver is to make Trusted Services SPs accessible for user space clients. All TS SPs have the same FF-A UUID, it identifies the RPC protocol used by TS. A TS SP can host one or more services, a service is identified by its service UUID. The same type of service cannot be present twice in the same SP. During SP boot each service in an SP is assigned an interface ID, this is just a short ID to simplify message addressing. There is 1:1 mapping between TS SPs and TEE devices, i.e. a separate TEE device is registered for each TS SP. This is required since contrary to the generic TEE design where memory is shared with the whole TEE implementation, in case of FF-A, memory is shared with a specific SP. A user space client has to be able to separately share memory with each SP based on its endpoint ID. Signed-off-by: Balint Dobszay --- drivers/tee/Kconfig | 1 + drivers/tee/Makefile | 1 + drivers/tee/tstee/Kconfig | 11 + drivers/tee/tstee/Makefile | 3 + drivers/tee/tstee/core.c | 490 ++++++++++++++++++++++++++++++ drivers/tee/tstee/tstee_private.h | 94 ++++++ include/uapi/linux/tee.h | 1 + 7 files changed, 601 insertions(+) create mode 100644 drivers/tee/tstee/Kconfig create mode 100644 drivers/tee/tstee/Makefile create mode 100644 drivers/tee/tstee/core.c create mode 100644 drivers/tee/tstee/tstee_private.h diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig index 73a147202e88..61b507c18780 100644 --- a/drivers/tee/Kconfig +++ b/drivers/tee/Kconfig @@ -15,5 +15,6 @@ if TEE =20 source "drivers/tee/optee/Kconfig" source "drivers/tee/amdtee/Kconfig" +source "drivers/tee/tstee/Kconfig" =20 endif diff --git a/drivers/tee/Makefile b/drivers/tee/Makefile index 68da044afbfa..5488cba30bd2 100644 --- a/drivers/tee/Makefile +++ b/drivers/tee/Makefile @@ -5,3 +5,4 @@ tee-objs +=3D tee_shm.o tee-objs +=3D tee_shm_pool.o obj-$(CONFIG_OPTEE) +=3D optee/ obj-$(CONFIG_AMDTEE) +=3D amdtee/ +obj-$(CONFIG_ARM_TSTEE) +=3D tstee/ diff --git a/drivers/tee/tstee/Kconfig b/drivers/tee/tstee/Kconfig new file mode 100644 index 000000000000..d32f91d47398 --- /dev/null +++ b/drivers/tee/tstee/Kconfig @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0-only +config ARM_TSTEE + tristate "Arm Trusted Services TEE driver" + depends on ARM_FFA_TRANSPORT + default n + help + The Trusted Services project provides a framework for developing and + deploying device Root of Trust services in FF-A Secure Partitions. + This driver provides an interface to make Trusted Services Secure + Partitions accessible for user space clients, since the FF-A driver + doesn't implement a user space interface directly. diff --git a/drivers/tee/tstee/Makefile b/drivers/tee/tstee/Makefile new file mode 100644 index 000000000000..5227020ebd30 --- /dev/null +++ b/drivers/tee/tstee/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +arm-tstee-objs :=3D core.o +obj-$(CONFIG_ARM_TSTEE) =3D arm-tstee.o diff --git a/drivers/tee/tstee/core.c b/drivers/tee/tstee/core.c new file mode 100644 index 000000000000..2932be017dbe --- /dev/null +++ b/drivers/tee/tstee/core.c @@ -0,0 +1,490 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023, Arm Limited + */ + +#define DRIVER_NAME "Arm TSTEE" +#define pr_fmt(fmt) DRIVER_NAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "tstee_private.h" + +#define FFA_DIRECT_REQ_ARG_NUM 5 +#define FFA_INVALID_MEM_HANDLE U64_MAX + +static void arg_list_to_ffa_data(const u32 *args, + struct ffa_send_direct_data *data) +{ + data->data0 =3D args[0]; + data->data1 =3D args[1]; + data->data2 =3D args[2]; + data->data3 =3D args[3]; + data->data4 =3D args[4]; +} + +static void arg_list_from_ffa_data(const struct ffa_send_direct_data *data, + u32 *args) +{ + args[0] =3D lower_32_bits(data->data0); + args[1] =3D lower_32_bits(data->data1); + args[2] =3D lower_32_bits(data->data2); + args[3] =3D lower_32_bits(data->data3); + args[4] =3D lower_32_bits(data->data4); +} + +static void tstee_get_version(struct tee_device *teedev, + struct tee_ioctl_version_data *vers) +{ + struct tstee *tstee =3D tee_get_drvdata(teedev); + struct tee_ioctl_version_data v =3D { + .impl_id =3D TEE_IMPL_ID_TSTEE, + /* FF-A endpoint ID only uses the lower 16 bits */ + .impl_caps =3D lower_16_bits(tstee->ffa_dev->vm_id), + .gen_caps =3D 0, + }; + + *vers =3D v; +} + +static int tstee_open(struct tee_context *ctx) +{ + struct ts_context_data *ctxdata; + + ctxdata =3D kzalloc(sizeof(*ctxdata), GFP_KERNEL); + if (!ctxdata) + return -ENOMEM; + + mutex_init(&ctxdata->mutex); + xa_init_flags(&ctxdata->sess_list, XA_FLAGS_ALLOC); + + ctx->data =3D ctxdata; + + return 0; +} + +static void tstee_release(struct tee_context *ctx) +{ + struct ts_context_data *ctxdata =3D ctx->data; + struct ts_session *sess; + unsigned long idx; + + if (!ctxdata) + return; + + xa_for_each(&ctxdata->sess_list, idx, sess) { + xa_erase(&ctxdata->sess_list, idx); + kfree(sess); + } + + xa_destroy(&ctxdata->sess_list); + mutex_destroy(&ctxdata->mutex); + + kfree(ctxdata); + ctx->data =3D NULL; +} + +static int tstee_open_session(struct tee_context *ctx, + struct tee_ioctl_open_session_arg *arg, + struct tee_param *param __always_unused) +{ + struct tstee *tstee =3D tee_get_drvdata(ctx->teedev); + struct ffa_device *ffa_dev =3D tstee->ffa_dev; + struct ts_context_data *ctxdata =3D ctx->data; + struct ffa_send_direct_data ffa_data; + struct ts_session *sess =3D NULL; + u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] =3D {}; + u32 sess_id; + int rc; + + ffa_args[TS_RPC_CTRL_REG] =3D + TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID, + TS_RPC_OP_SERVICE_INFO); + + memcpy(ffa_args + TS_RPC_SERVICE_INFO_UUID0, arg->uuid, UUID_SIZE); + + arg_list_to_ffa_data(ffa_args, &ffa_data); + rc =3D ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data); + if (rc) + return rc; + + arg_list_from_ffa_data(&ffa_data, ffa_args); + + if (ffa_args[TS_RPC_SERVICE_INFO_RPC_STATUS] !=3D TS_RPC_OK) + return -ENODEV; + + if (ffa_args[TS_RPC_SERVICE_INFO_IFACE] > U8_MAX) + return -EINVAL; + + sess =3D kzalloc(sizeof(*sess), GFP_KERNEL); + if (!sess) + return -ENOMEM; + + sess->iface_id =3D ffa_args[TS_RPC_SERVICE_INFO_IFACE]; + + rc =3D xa_alloc(&ctxdata->sess_list, &sess_id, sess, xa_limit_32b, + GFP_KERNEL); + if (rc) { + kfree(sess); + return rc; + } + + arg->session =3D sess_id; + arg->ret =3D 0; + + return 0; +} + +static int tstee_close_session(struct tee_context *ctx, u32 session) +{ + struct ts_context_data *ctxdata =3D ctx->data; + struct ts_session *sess; + + mutex_lock(&ctxdata->mutex); + sess =3D xa_erase(&ctxdata->sess_list, session); + mutex_unlock(&ctxdata->mutex); + if (!sess) + return -EINVAL; + + kfree(sess); + + return 0; +} + +static int tstee_invoke_func(struct tee_context *ctx, + struct tee_ioctl_invoke_arg *arg, + struct tee_param *param) +{ + struct tstee *tstee =3D tee_get_drvdata(ctx->teedev); + struct ffa_device *ffa_dev =3D tstee->ffa_dev; + struct ts_context_data *ctxdata =3D ctx->data; + struct ffa_send_direct_data ffa_data; + struct tee_shm *shm =3D NULL; + struct ts_session *sess; + u32 req_len, ffa_args[FFA_DIRECT_REQ_ARG_NUM] =3D {}; + int shm_id, rc; + u8 iface_id; + u64 handle; + u16 opcode; + + mutex_lock(&ctxdata->mutex); + sess =3D xa_load(&ctxdata->sess_list, arg->session); + + /* + * Do this while holding the mutex to make sure that the session wasn't + * closed meanwhile + */ + if (sess) + iface_id =3D sess->iface_id; + + mutex_unlock(&ctxdata->mutex); + if (!sess) + return -EINVAL; + + opcode =3D lower_16_bits(arg->func); + shm_id =3D lower_32_bits(param[0].u.value.a); + req_len =3D lower_32_bits(param[0].u.value.b); + + if (shm_id !=3D 0) { + shm =3D tee_shm_get_from_id(ctx, shm_id); + if (IS_ERR(shm)) + return PTR_ERR(shm); + + if (shm->size < req_len) { + pr_err("request doesn't fit into shared memory buffer\n"); + rc =3D -EINVAL; + goto out; + } + + handle =3D shm->sec_world_id; + } else { + handle =3D FFA_INVALID_MEM_HANDLE; + } + + ffa_args[TS_RPC_CTRL_REG] =3D TS_RPC_CTRL_PACK_IFACE_OPCODE(iface_id, + opcode); + ffa_args[TS_RPC_SERVICE_MEM_HANDLE_LSW] =3D lower_32_bits(handle); + ffa_args[TS_RPC_SERVICE_MEM_HANDLE_MSW] =3D upper_32_bits(handle); + ffa_args[TS_RPC_SERVICE_REQ_LEN] =3D req_len; + ffa_args[TS_RPC_SERVICE_CLIENT_ID] =3D 0; + + arg_list_to_ffa_data(ffa_args, &ffa_data); + rc =3D ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data); + if (rc) + goto out; + + arg_list_from_ffa_data(&ffa_data, ffa_args); + + if (ffa_args[TS_RPC_SERVICE_RPC_STATUS] !=3D TS_RPC_OK) { + pr_err("invoke_func rpc status: %d\n", + ffa_args[TS_RPC_SERVICE_RPC_STATUS]); + rc =3D -EINVAL; + goto out; + } + + arg->ret =3D ffa_args[TS_RPC_SERVICE_STATUS]; + if (shm && shm->size >=3D ffa_args[TS_RPC_SERVICE_RESP_LEN]) + param[0].u.value.a =3D ffa_args[TS_RPC_SERVICE_RESP_LEN]; + +out: + if (shm) + tee_shm_put(shm); + + return rc; +} + +static int tstee_shm_register(struct tee_context *ctx, struct tee_shm *shm, + struct page **pages, size_t num_pages, + unsigned long start __always_unused) +{ + struct tstee *tstee =3D tee_get_drvdata(ctx->teedev); + struct ffa_device *ffa_dev =3D tstee->ffa_dev; + struct ffa_mem_region_attributes mem_attr =3D { + .receiver =3D tstee->ffa_dev->vm_id, + .attrs =3D FFA_MEM_RW, + .flag =3D 0, + }; + struct ffa_mem_ops_args mem_args =3D { + .attrs =3D &mem_attr, + .use_txbuf =3D true, + .nattrs =3D 1, + .flags =3D 0, + }; + struct ffa_send_direct_data ffa_data; + struct sg_table sgt; + u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] =3D {}; + int rc; + + rc =3D sg_alloc_table_from_pages(&sgt, pages, num_pages, 0, + num_pages * PAGE_SIZE, GFP_KERNEL); + if (rc) + return rc; + + mem_args.sg =3D sgt.sgl; + rc =3D ffa_dev->ops->mem_ops->memory_share(&mem_args); + sg_free_table(&sgt); + if (rc) + return rc; + + shm->sec_world_id =3D mem_args.g_handle; + + ffa_args[TS_RPC_CTRL_REG] =3D + TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID, + TS_RPC_OP_RETRIEVE_MEM); + ffa_args[TS_RPC_RETRIEVE_MEM_HANDLE_LSW] =3D + lower_32_bits(shm->sec_world_id); + ffa_args[TS_RPC_RETRIEVE_MEM_HANDLE_MSW] =3D + upper_32_bits(shm->sec_world_id); + ffa_args[TS_RPC_RETRIEVE_MEM_TAG_LSW] =3D 0; + ffa_args[TS_RPC_RETRIEVE_MEM_TAG_MSW] =3D 0; + + arg_list_to_ffa_data(ffa_args, &ffa_data); + rc =3D ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data); + if (rc) { + (void)ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id, + 0); + return rc; + } + + arg_list_from_ffa_data(&ffa_data, ffa_args); + + if (ffa_args[TS_RPC_RETRIEVE_MEM_RPC_STATUS] !=3D TS_RPC_OK) { + pr_err("shm_register rpc status: %d\n", + ffa_args[TS_RPC_RETRIEVE_MEM_RPC_STATUS]); + ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id, 0); + return -EINVAL; + } + + return 0; +} + +static int tstee_shm_unregister(struct tee_context *ctx, struct tee_shm *s= hm) +{ + struct tstee *tstee =3D tee_get_drvdata(ctx->teedev); + struct ffa_device *ffa_dev =3D tstee->ffa_dev; + struct ffa_send_direct_data ffa_data; + u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] =3D {}; + int rc; + + ffa_args[TS_RPC_CTRL_REG] =3D + TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID, + TS_RPC_OP_RELINQ_MEM); + ffa_args[TS_RPC_RELINQ_MEM_HANDLE_LSW] =3D + lower_32_bits(shm->sec_world_id); + ffa_args[TS_RPC_RELINQ_MEM_HANDLE_MSW] =3D + upper_32_bits(shm->sec_world_id); + + arg_list_to_ffa_data(ffa_args, &ffa_data); + rc =3D ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data); + if (rc) + return rc; + arg_list_from_ffa_data(&ffa_data, ffa_args); + + if (ffa_args[TS_RPC_RELINQ_MEM_RPC_STATUS] !=3D TS_RPC_OK) { + pr_err("shm_unregister rpc status: %d\n", + ffa_args[TS_RPC_RELINQ_MEM_RPC_STATUS]); + return -EINVAL; + } + + rc =3D ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id, 0); + + return rc; +} + +static const struct tee_driver_ops tstee_ops =3D { + .get_version =3D tstee_get_version, + .open =3D tstee_open, + .release =3D tstee_release, + .open_session =3D tstee_open_session, + .close_session =3D tstee_close_session, + .invoke_func =3D tstee_invoke_func, + .shm_register =3D tstee_shm_register, + .shm_unregister =3D tstee_shm_unregister, +}; + +static const struct tee_desc tstee_desc =3D { + .name =3D "tstee-clnt", + .ops =3D &tstee_ops, + .owner =3D THIS_MODULE, +}; + +static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm, + size_t size, size_t align) +{ + return tee_shm_pool_op_alloc_helper(pool, shm, size, align, + tstee_shm_register); +} + +static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm) +{ + tee_shm_pool_op_free_helper(pool, shm, tstee_shm_unregister); +} + +static void pool_op_destroy_pool(struct tee_shm_pool *pool) +{ + kfree(pool); +} + +static const struct tee_shm_pool_ops pool_ops =3D { + .alloc =3D pool_op_alloc, + .free =3D pool_op_free, + .destroy_pool =3D pool_op_destroy_pool, +}; + +static struct tee_shm_pool *tstee_create_shm_pool(void) +{ + struct tee_shm_pool *pool =3D kzalloc(sizeof(*pool), GFP_KERNEL); + + if (!pool) + return ERR_PTR(-ENOMEM); + + pool->ops =3D &pool_ops; + + return pool; +} + +static bool tstee_check_rpc_compatible(struct ffa_device *ffa_dev) +{ + struct ffa_send_direct_data ffa_data; + u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] =3D {}; + + ffa_args[TS_RPC_CTRL_REG] =3D + TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID, + TS_RPC_OP_GET_VERSION); + + arg_list_to_ffa_data(ffa_args, &ffa_data); + if (ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data)) + return false; + + arg_list_from_ffa_data(&ffa_data, ffa_args); + + return ffa_args[TS_RPC_GET_VERSION_RESP] =3D=3D TS_RPC_PROTOCOL_VERSION; +} + +static int tstee_probe(struct ffa_device *ffa_dev) +{ + struct tstee *tstee; + int rc; + + ffa_dev->ops->msg_ops->mode_32bit_set(ffa_dev); + + if (!tstee_check_rpc_compatible(ffa_dev)) + return -EINVAL; + + tstee =3D kzalloc(sizeof(*tstee), GFP_KERNEL); + if (!tstee) + return -ENOMEM; + + tstee->ffa_dev =3D ffa_dev; + + tstee->pool =3D tstee_create_shm_pool(); + if (IS_ERR(tstee->pool)) { + rc =3D PTR_ERR(tstee->pool); + tstee->pool =3D NULL; + goto err_free_tstee; + } + + tstee->teedev =3D tee_device_alloc(&tstee_desc, NULL, tstee->pool, tstee); + if (IS_ERR(tstee->teedev)) { + rc =3D PTR_ERR(tstee->teedev); + tstee->teedev =3D NULL; + goto err_free_pool; + } + + rc =3D tee_device_register(tstee->teedev); + if (rc) + goto err_unreg_teedev; + + ffa_dev_set_drvdata(ffa_dev, tstee); + + return 0; + +err_unreg_teedev: + tee_device_unregister(tstee->teedev); +err_free_pool: + tee_shm_pool_free(tstee->pool); +err_free_tstee: + kfree(tstee); + return rc; +} + +static void tstee_remove(struct ffa_device *ffa_dev) +{ + struct tstee *tstee =3D ffa_dev->dev.driver_data; + + tee_device_unregister(tstee->teedev); + tee_shm_pool_free(tstee->pool); + kfree(tstee); +} + +static const struct ffa_device_id tstee_device_ids[] =3D { + /* TS RPC protocol UUID: bdcd76d7-825e-4751-963b-86d4f84943ac */ + { TS_RPC_UUID }, + {} +}; + +static struct ffa_driver tstee_driver =3D { + .name =3D "arm_tstee", + .probe =3D tstee_probe, + .remove =3D tstee_remove, + .id_table =3D tstee_device_ids, +}; + +module_ffa_driver(tstee_driver); + +MODULE_AUTHOR("Balint Dobszay "); +MODULE_DESCRIPTION("Arm Trusted Services TEE driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/tee/tstee/tstee_private.h b/drivers/tee/tstee/tstee_pr= ivate.h new file mode 100644 index 000000000000..6d24cf0dbbc2 --- /dev/null +++ b/drivers/tee/tstee/tstee_private.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2023, Arm Limited + */ + +#ifndef TSTEE_PRIVATE_H +#define TSTEE_PRIVATE_H + +#include +#include +#include +#include +#include +#include + +/* + * The description of the ABI implemented in this file is available at + * https://trusted-services.readthedocs.io/en/v1.0.0/developer/service-acc= ess-protocols.html#abi + */ + +/* UUID of this protocol */ +#define TS_RPC_UUID UUID_INIT(0xbdcd76d7, 0x825e, 0x4751, \ + 0x96, 0x3b, 0x86, 0xd4, 0xf8, 0x49, 0x43, 0xac) + +/* Protocol version*/ +#define TS_RPC_PROTOCOL_VERSION (1) + +/* Status codes */ +#define TS_RPC_OK (0) + +/* RPC control register */ +#define TS_RPC_CTRL_REG (0) +#define OPCODE_MASK GENMASK(15, 0) +#define IFACE_ID_MASK GENMASK(23, 16) +#define TS_RPC_CTRL_OPCODE(x) ((u16)(FIELD_GET(OPCODE_MASK, (x)))) +#define TS_RPC_CTRL_IFACE_ID(x) ((u8)(FIELD_GET(IFACE_ID_MASK, (x)))) +#define TS_RPC_CTRL_PACK_IFACE_OPCODE(i, o) \ + (FIELD_PREP(IFACE_ID_MASK, (i)) | FIELD_PREP(OPCODE_MASK, (o))) +#define TS_RPC_CTRL_SAP_RC BIT(30) +#define TS_RPC_CTRL_SAP_ERR BIT(31) + +/* Interface ID for RPC management operations */ +#define TS_RPC_MGMT_IFACE_ID (0xff) + +/* Management calls */ +#define TS_RPC_OP_GET_VERSION (0x0000) +#define TS_RPC_GET_VERSION_RESP (1) + +#define TS_RPC_OP_RETRIEVE_MEM (0x0001) +#define TS_RPC_RETRIEVE_MEM_HANDLE_LSW (1) +#define TS_RPC_RETRIEVE_MEM_HANDLE_MSW (2) +#define TS_RPC_RETRIEVE_MEM_TAG_LSW (3) +#define TS_RPC_RETRIEVE_MEM_TAG_MSW (4) +#define TS_RPC_RETRIEVE_MEM_RPC_STATUS (1) + +#define TS_RPC_OP_RELINQ_MEM (0x0002) +#define TS_RPC_RELINQ_MEM_HANDLE_LSW (1) +#define TS_RPC_RELINQ_MEM_HANDLE_MSW (2) +#define TS_RPC_RELINQ_MEM_RPC_STATUS (1) + +#define TS_RPC_OP_SERVICE_INFO (0x0003) +#define TS_RPC_SERVICE_INFO_UUID0 (1) +#define TS_RPC_SERVICE_INFO_UUID1 (2) +#define TS_RPC_SERVICE_INFO_UUID2 (3) +#define TS_RPC_SERVICE_INFO_UUID3 (4) +#define TS_RPC_SERVICE_INFO_RPC_STATUS (1) +#define TS_RPC_SERVICE_INFO_IFACE (2) + +/* Service call */ +#define TS_RPC_SERVICE_MEM_HANDLE_LSW (1) +#define TS_RPC_SERVICE_MEM_HANDLE_MSW (2) +#define TS_RPC_SERVICE_REQ_LEN (3) +#define TS_RPC_SERVICE_CLIENT_ID (4) +#define TS_RPC_SERVICE_RPC_STATUS (1) +#define TS_RPC_SERVICE_STATUS (2) +#define TS_RPC_SERVICE_RESP_LEN (3) + +struct tstee { + struct ffa_device *ffa_dev; + struct tee_device *teedev; + struct tee_shm_pool *pool; +}; + +struct ts_session { + u8 iface_id; +}; + +struct ts_context_data { + struct xarray sess_list; + /* Serializes access to the session list */ + struct mutex mutex; +}; + +#endif /* TSTEE_PRIVATE_H */ diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index 23e57164693c..d0430bee8292 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -56,6 +56,7 @@ */ #define TEE_IMPL_ID_OPTEE 1 #define TEE_IMPL_ID_AMDTEE 2 +#define TEE_IMPL_ID_TSTEE 3 =20 /* * OP-TEE specific capabilities --=20 2.34.1 From nobody Sun Feb 8 10:49:17 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C433B5D730; Fri, 23 Feb 2024 09:53:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681994; cv=none; b=JYV+5JFyooQKy7XHUQmO9YzU5w3kmPNPwxicedr4pircr5kKqWb93z6XwGucONccoz7hD4gJweLqiBVilBnz7xlYgtWVszyydyoWDz0KiQfCKhqJhfA/r86ojFkjhiDAVq9VmRcklxaa3v7tGgTbr+9BHqa2iRtoOVdHyZhmJ5U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708681994; c=relaxed/simple; bh=mEA7OXWofji3JL9y/tySpRMxEmSCep2gGBXCli4pK6E=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=h6NFk8m4WFKomz46PlY/KkT/7ic5TqM1teB3F0M8Rt6X3Txhie8MPL4+dpHho5Wt2z5gexvUcnQ3OqCKh7NM8/ReihQ9MZiQAuc3Q1l9lY5JwfT/boFyJJPyIAzgAAsrXk/xkvGuqicTpNd6EhuoYD6rPVsqTGrkh0D+DCWY7qg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BC2CE15DB; Fri, 23 Feb 2024 01:53:50 -0800 (PST) Received: from mango.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 423D23F766; Fri, 23 Feb 2024 01:53:10 -0800 (PST) From: Balint Dobszay To: op-tee@lists.trustedfirmware.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: jens.wiklander@linaro.org, sumit.garg@linaro.org, corbet@lwn.net, balint.dobszay@arm.com, sudeep.holla@arm.com, rdunlap@infradead.org, krzk@kernel.org, gyorgy.szing@arm.com Subject: [PATCH v2 3/3] Documentation: tee: Add TS-TEE driver Date: Fri, 23 Feb 2024 10:51:33 +0100 Message-Id: <20240223095133.109046-4-balint.dobszay@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240223095133.109046-1-balint.dobszay@arm.com> References: <20240223095133.109046-1-balint.dobszay@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add documentation for the Trusted Services TEE driver. Signed-off-by: Balint Dobszay Acked-by: Sumit Garg --- Documentation/tee/index.rst | 1 + Documentation/tee/ts-tee.rst | 71 ++++++++++++++++++++++++++++++++++++ 2 files changed, 72 insertions(+) create mode 100644 Documentation/tee/ts-tee.rst diff --git a/Documentation/tee/index.rst b/Documentation/tee/index.rst index a23bd08847e5..4be6e69d7837 100644 --- a/Documentation/tee/index.rst +++ b/Documentation/tee/index.rst @@ -10,6 +10,7 @@ TEE Subsystem tee op-tee amd-tee + ts-tee =20 .. only:: subproject and html =20 diff --git a/Documentation/tee/ts-tee.rst b/Documentation/tee/ts-tee.rst new file mode 100644 index 000000000000..843e34422648 --- /dev/null +++ b/Documentation/tee/ts-tee.rst @@ -0,0 +1,71 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D +TS-TEE (Trusted Services project) +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D + +This driver provides access to secure services implemented by Trusted Serv= ices. + +Trusted Services [1] is a TrustedFirmware.org project that provides a fram= ework +for developing and deploying device Root of Trust services in FF-A [2] S-E= L0 +Secure Partitions. The project hosts the reference implementation of the A= rm +Platform Security Architecture [3] for Arm A-profile devices. + +The FF-A Secure Partitions (SP) are accessible through the FF-A driver [4]= which +provides the low level communication for this driver. On top of that the T= rusted +Services RPC protocol is used [5]. To use the driver from user space a ref= erence +implementation is provided at [6], which is part of the Trusted Services c= lient +library called libts [7]. + +All Trusted Services (TS) SPs have the same FF-A UUID; it identifies the T= S RPC +protocol. A TS SP can host one or more services (e.g. PSA Crypto, PSA ITS,= etc). +A service is identified by its service UUID; the same type of service cann= ot be +present twice in the same SP. During SP boot each service in the SP is ass= igned +an "interface ID". This is just a short ID to simplify message addressing. + +The generic TEE design is to share memory at once with the Trusted OS, whi= ch can +then be reused to communicate with multiple applications running on the Tr= usted +OS. However, in case of FF-A, memory sharing works on an endpoint level, i= .e. +memory is shared with a specific SP. User space has to be able to separate= ly +share memory with each SP based on its endpoint ID; therefore a separate T= EE +device is registered for each discovered TS SP. Opening the SP corresponds= to +opening the TEE device and creating a TEE context. A TS SP hosts one or mo= re +services. Opening a service corresponds to opening a session in the given +tee_context. + +Overview of a system with Trusted Services components:: + + User space Kernel space Secure world + ~~~~~~~~~~ ~~~~~~~~~~~~ ~~~~~~~~~~~~ + +--------+ +-------------+ + | Client | | Trusted | + +--------+ | Services SP | + /\ +-------------+ + || /\ + || || + || || + \/ \/ + +-------+ +----------+--------+ +-------------+ + | libts | | TEE | TS-TEE | | FF-A SPMC | + | | | subsys | driver | | + SPMD | + +-------+----------------+----+-----+--------+-----------+-------------+ + | Generic TEE API | | FF-A | TS RPC protocol | + | IOCTL (TEE_IOC_*) | | driver | over FF-A | + +-----------------------------+ +--------+-------------------------+ + +References +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +[1] https://www.trustedfirmware.org/projects/trusted-services/ + +[2] https://developer.arm.com/documentation/den0077/ + +[3] https://www.arm.com/architecture/security-features/platform-security + +[4] drivers/firmware/arm_ffa/ + +[5] https://trusted-services.readthedocs.io/en/v1.0.0/developer/service-ac= cess-protocols.html#abi + +[6] https://git.trustedfirmware.org/TS/trusted-services.git/tree/component= s/rpc/ts_rpc/caller/linux/ts_rpc_caller_linux.c?h=3Dv1.0.0 + +[7] https://git.trustedfirmware.org/TS/trusted-services.git/tree/deploymen= ts/libts/arm-linux/CMakeLists.txt?h=3Dv1.0.0 --=20 2.34.1