tee: generic TEE subsystem
Initial patch for generic TEE subsystem. This subsystem provides: * Registration/un-registration of TEE drivers. * Shared memory between normal world and secure world. * Ioctl interface for interaction with user space. * Sysfs implementation_id of TEE driver A TEE (Trusted Execution Environment) driver is a driver that interfaces with a trusted OS running in some secure environment, for example, TrustZone on ARM cpus, or a separate secure co-processor etc. The TEE subsystem can serve a TEE driver for a Global Platform compliant TEE, but it's not limited to only Global Platform TEEs. This patch builds on other similar implementations trying to solve the same problem: * "optee_linuxdriver" by among others Jean-michel DELORME<jean-michel.delorme@st.com> and Emmanuel MICHEL <emmanuel.michel@st.com> * "Generic TrustZone Driver" by Javier González <javier@javigon.com> Acked-by: Andreas Dannenberg <dannenberg@ti.com> Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (HiKey) Tested-by: Volodymyr Babchuk <vlad.babchuk@gmail.com> (RCAR H3) Tested-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander
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include/uapi/linux/tee.h
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346
include/uapi/linux/tee.h
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/*
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* Copyright (c) 2015-2016, Linaro Limited
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __TEE_H
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#define __TEE_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/*
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* This file describes the API provided by a TEE driver to user space.
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*
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* Each TEE driver defines a TEE specific protocol which is used for the
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* data passed back and forth using TEE_IOC_CMD.
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*/
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/* Helpers to make the ioctl defines */
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#define TEE_IOC_MAGIC 0xa4
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#define TEE_IOC_BASE 0
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/* Flags relating to shared memory */
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#define TEE_IOCTL_SHM_MAPPED 0x1 /* memory mapped in normal world */
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#define TEE_IOCTL_SHM_DMA_BUF 0x2 /* dma-buf handle on shared memory */
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#define TEE_MAX_ARG_SIZE 1024
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#define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */
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/*
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* TEE Implementation ID
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*/
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#define TEE_IMPL_ID_OPTEE 1
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/*
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* OP-TEE specific capabilities
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*/
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#define TEE_OPTEE_CAP_TZ (1 << 0)
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/**
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* struct tee_ioctl_version_data - TEE version
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* @impl_id: [out] TEE implementation id
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* @impl_caps: [out] Implementation specific capabilities
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* @gen_caps: [out] Generic capabilities, defined by TEE_GEN_CAPS_* above
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*
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* Identifies the TEE implementation, @impl_id is one of TEE_IMPL_ID_* above.
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* @impl_caps is implementation specific, for example TEE_OPTEE_CAP_*
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* is valid when @impl_id == TEE_IMPL_ID_OPTEE.
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*/
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struct tee_ioctl_version_data {
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__u32 impl_id;
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__u32 impl_caps;
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__u32 gen_caps;
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};
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/**
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* TEE_IOC_VERSION - query version of TEE
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*
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* Takes a tee_ioctl_version_data struct and returns with the TEE version
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* data filled in.
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*/
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#define TEE_IOC_VERSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 0, \
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struct tee_ioctl_version_data)
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/**
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* struct tee_ioctl_shm_alloc_data - Shared memory allocate argument
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* @size: [in/out] Size of shared memory to allocate
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* @flags: [in/out] Flags to/from allocation.
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* @id: [out] Identifier of the shared memory
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*
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* The flags field should currently be zero as input. Updated by the call
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* with actual flags as defined by TEE_IOCTL_SHM_* above.
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* This structure is used as argument for TEE_IOC_SHM_ALLOC below.
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*/
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struct tee_ioctl_shm_alloc_data {
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__u64 size;
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__u32 flags;
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__s32 id;
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};
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/**
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* TEE_IOC_SHM_ALLOC - allocate shared memory
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*
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* Allocates shared memory between the user space process and secure OS.
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*
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* Returns a file descriptor on success or < 0 on failure
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*
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* The returned file descriptor is used to map the shared memory into user
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* space. The shared memory is freed when the descriptor is closed and the
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* memory is unmapped.
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*/
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#define TEE_IOC_SHM_ALLOC _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 1, \
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struct tee_ioctl_shm_alloc_data)
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/**
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* struct tee_ioctl_buf_data - Variable sized buffer
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* @buf_ptr: [in] A __user pointer to a buffer
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* @buf_len: [in] Length of the buffer above
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*
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* Used as argument for TEE_IOC_OPEN_SESSION, TEE_IOC_INVOKE,
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* TEE_IOC_SUPPL_RECV, and TEE_IOC_SUPPL_SEND below.
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*/
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struct tee_ioctl_buf_data {
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__u64 buf_ptr;
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__u64 buf_len;
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};
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/*
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* Attributes for struct tee_ioctl_param, selects field in the union
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*/
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#define TEE_IOCTL_PARAM_ATTR_TYPE_NONE 0 /* parameter not used */
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/*
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* These defines value parameters (struct tee_ioctl_param_value)
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*/
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#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT 1
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#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT 2
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#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT 3 /* input and output */
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/*
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* These defines shared memory reference parameters (struct
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* tee_ioctl_param_memref)
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*/
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#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT 5
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#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6
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#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT 7 /* input and output */
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/*
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* Mask for the type part of the attribute, leaves room for more types
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*/
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#define TEE_IOCTL_PARAM_ATTR_TYPE_MASK 0xff
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/*
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* Matches TEEC_LOGIN_* in GP TEE Client API
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* Are only defined for GP compliant TEEs
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*/
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#define TEE_IOCTL_LOGIN_PUBLIC 0
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#define TEE_IOCTL_LOGIN_USER 1
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#define TEE_IOCTL_LOGIN_GROUP 2
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#define TEE_IOCTL_LOGIN_APPLICATION 4
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#define TEE_IOCTL_LOGIN_USER_APPLICATION 5
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#define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6
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/**
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* struct tee_ioctl_param - parameter
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* @attr: attributes
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* @a: if a memref, offset into the shared memory object, else a value parameter
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* @b: if a memref, size of the buffer, else a value parameter
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* @c: if a memref, shared memory identifier, else a value parameter
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*
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* @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in
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* the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and
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* TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE
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* indicates that none of the members are used.
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*
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* Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an
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* identifier representing the shared memory object. A memref can reference
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* a part of a shared memory by specifying an offset (@a) and size (@b) of
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* the object. To supply the entire shared memory object set the offset
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* (@a) to 0 and size (@b) to the previously returned size of the object.
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*/
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struct tee_ioctl_param {
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__u64 attr;
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__u64 a;
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__u64 b;
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__u64 c;
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};
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#define TEE_IOCTL_UUID_LEN 16
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/**
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* struct tee_ioctl_open_session_arg - Open session argument
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* @uuid: [in] UUID of the Trusted Application
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* @clnt_uuid: [in] UUID of client
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* @clnt_login: [in] Login class of client, TEE_IOCTL_LOGIN_* above
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* @cancel_id: [in] Cancellation id, a unique value to identify this request
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* @session: [out] Session id
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* @ret: [out] return value
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* @ret_origin [out] origin of the return value
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* @num_params [in] number of parameters following this struct
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*/
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struct tee_ioctl_open_session_arg {
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__u8 uuid[TEE_IOCTL_UUID_LEN];
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__u8 clnt_uuid[TEE_IOCTL_UUID_LEN];
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__u32 clnt_login;
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__u32 cancel_id;
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__u32 session;
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__u32 ret;
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__u32 ret_origin;
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__u32 num_params;
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/* num_params tells the actual number of element in params */
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struct tee_ioctl_param params[];
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};
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/**
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* TEE_IOC_OPEN_SESSION - opens a session to a Trusted Application
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*
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* Takes a struct tee_ioctl_buf_data which contains a struct
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* tee_ioctl_open_session_arg followed by any array of struct
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* tee_ioctl_param
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*/
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#define TEE_IOC_OPEN_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 2, \
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struct tee_ioctl_buf_data)
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/**
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* struct tee_ioctl_invoke_func_arg - Invokes a function in a Trusted
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* Application
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* @func: [in] Trusted Application function, specific to the TA
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* @session: [in] Session id
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* @cancel_id: [in] Cancellation id, a unique value to identify this request
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* @ret: [out] return value
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* @ret_origin [out] origin of the return value
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* @num_params [in] number of parameters following this struct
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*/
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struct tee_ioctl_invoke_arg {
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__u32 func;
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__u32 session;
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__u32 cancel_id;
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__u32 ret;
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__u32 ret_origin;
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__u32 num_params;
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/* num_params tells the actual number of element in params */
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struct tee_ioctl_param params[];
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};
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/**
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* TEE_IOC_INVOKE - Invokes a function in a Trusted Application
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*
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* Takes a struct tee_ioctl_buf_data which contains a struct
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* tee_invoke_func_arg followed by any array of struct tee_param
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*/
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#define TEE_IOC_INVOKE _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 3, \
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struct tee_ioctl_buf_data)
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/**
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* struct tee_ioctl_cancel_arg - Cancels an open session or invoke ioctl
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* @cancel_id: [in] Cancellation id, a unique value to identify this request
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* @session: [in] Session id, if the session is opened, else set to 0
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*/
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struct tee_ioctl_cancel_arg {
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__u32 cancel_id;
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__u32 session;
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};
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/**
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* TEE_IOC_CANCEL - Cancels an open session or invoke
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*/
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#define TEE_IOC_CANCEL _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 4, \
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struct tee_ioctl_cancel_arg)
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/**
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* struct tee_ioctl_close_session_arg - Closes an open session
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* @session: [in] Session id
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*/
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struct tee_ioctl_close_session_arg {
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__u32 session;
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};
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/**
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* TEE_IOC_CLOSE_SESSION - Closes a session
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*/
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#define TEE_IOC_CLOSE_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 5, \
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struct tee_ioctl_close_session_arg)
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/**
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* struct tee_iocl_supp_recv_arg - Receive a request for a supplicant function
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* @func: [in] supplicant function
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* @num_params [in/out] number of parameters following this struct
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*
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* @num_params is the number of params that tee-supplicant has room to
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* receive when input, @num_params is the number of actual params
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* tee-supplicant receives when output.
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*/
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struct tee_iocl_supp_recv_arg {
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__u32 func;
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__u32 num_params;
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/* num_params tells the actual number of element in params */
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struct tee_ioctl_param params[];
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};
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/**
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* TEE_IOC_SUPPL_RECV - Receive a request for a supplicant function
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*
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* Takes a struct tee_ioctl_buf_data which contains a struct
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* tee_iocl_supp_recv_arg followed by any array of struct tee_param
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*/
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#define TEE_IOC_SUPPL_RECV _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 6, \
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struct tee_ioctl_buf_data)
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/**
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* struct tee_iocl_supp_send_arg - Send a response to a received request
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* @ret: [out] return value
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* @num_params [in] number of parameters following this struct
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*/
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struct tee_iocl_supp_send_arg {
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__u32 ret;
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__u32 num_params;
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/* num_params tells the actual number of element in params */
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struct tee_ioctl_param params[];
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};
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/**
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* TEE_IOC_SUPPL_SEND - Receive a request for a supplicant function
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*
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* Takes a struct tee_ioctl_buf_data which contains a struct
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* tee_iocl_supp_send_arg followed by any array of struct tee_param
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*/
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#define TEE_IOC_SUPPL_SEND _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \
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struct tee_ioctl_buf_data)
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/*
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* Five syscalls are used when communicating with the TEE driver.
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* open(): opens the device associated with the driver
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* ioctl(): as described above operating on the file descriptor from open()
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* close(): two cases
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* - closes the device file descriptor
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* - closes a file descriptor connected to allocated shared memory
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* mmap(): maps shared memory into user space using information from struct
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* tee_ioctl_shm_alloc_data
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* munmap(): unmaps previously shared memory
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*/
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#endif /*__TEE_H*/
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