326 lines
9.7 KiB
C
326 lines
9.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015-2021, Linaro Limited
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*/
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#ifndef OPTEE_PRIVATE_H
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#define OPTEE_PRIVATE_H
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#include <linux/arm-smccc.h>
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#include <linux/rhashtable.h>
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#include <linux/semaphore.h>
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#include <linux/tee_drv.h>
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#include <linux/types.h>
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#include "optee_msg.h"
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#define DRIVER_NAME "optee"
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#define OPTEE_MAX_ARG_SIZE 1024
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/* Some Global Platform error codes used in this driver */
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#define TEEC_SUCCESS 0x00000000
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#define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006
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#define TEEC_ERROR_NOT_SUPPORTED 0xFFFF000A
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#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
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#define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
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#define TEEC_ERROR_BUSY 0xFFFF000D
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#define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010
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#define TEEC_ORIGIN_COMMS 0x00000002
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/*
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* This value should be larger than the number threads in secure world to
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* meet the need from secure world. The number of threads in secure world
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* are usually not even close to 255 so we should be safe for now.
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*/
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#define OPTEE_DEFAULT_MAX_NOTIF_VALUE 255
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typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long,
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struct arm_smccc_res *);
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struct optee_call_waiter {
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struct list_head list_node;
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struct completion c;
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};
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struct optee_call_queue {
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/* Serializes access to this struct */
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struct mutex mutex;
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struct list_head waiters;
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};
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struct optee_notif {
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u_int max_key;
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/* Serializes access to the elements below in this struct */
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spinlock_t lock;
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struct list_head db;
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u_long *bitmap;
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};
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#define OPTEE_SHM_ARG_ALLOC_PRIV BIT(0)
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#define OPTEE_SHM_ARG_SHARED BIT(1)
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struct optee_shm_arg_entry;
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struct optee_shm_arg_cache {
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u32 flags;
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/* Serializes access to this struct */
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struct mutex mutex;
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struct list_head shm_args;
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};
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/**
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* struct optee_supp - supplicant synchronization struct
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* @ctx the context of current connected supplicant.
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* if !NULL the supplicant device is available for use,
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* else busy
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* @mutex: held while accessing content of this struct
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* @req_id: current request id if supplicant is doing synchronous
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* communication, else -1
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* @reqs: queued request not yet retrieved by supplicant
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* @idr: IDR holding all requests currently being processed
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* by supplicant
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* @reqs_c: completion used by supplicant when waiting for a
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* request to be queued.
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*/
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struct optee_supp {
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/* Serializes access to this struct */
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struct mutex mutex;
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struct tee_context *ctx;
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int req_id;
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struct list_head reqs;
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struct idr idr;
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struct completion reqs_c;
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};
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struct optee_smc {
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optee_invoke_fn *invoke_fn;
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void *memremaped_shm;
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u32 sec_caps;
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unsigned int notif_irq;
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};
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/**
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* struct optee_ffa_data - FFA communication struct
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* @ffa_dev FFA device, contains the destination id, the id of
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* OP-TEE in secure world
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* @ffa_ops FFA operations
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* @mutex Serializes access to @global_ids
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* @global_ids FF-A shared memory global handle translation
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*/
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struct optee_ffa {
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struct ffa_device *ffa_dev;
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/* Serializes access to @global_ids */
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struct mutex mutex;
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struct rhashtable global_ids;
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};
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struct optee;
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/**
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* struct optee_ops - OP-TEE driver internal operations
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* @do_call_with_arg: enters OP-TEE in secure world
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* @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters
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* @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param
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*
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* These OPs are only supposed to be used internally in the OP-TEE driver
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* as a way of abstracting the different methogs of entering OP-TEE in
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* secure world.
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*/
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struct optee_ops {
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int (*do_call_with_arg)(struct tee_context *ctx,
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struct tee_shm *shm_arg, u_int offs);
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int (*to_msg_param)(struct optee *optee,
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struct optee_msg_param *msg_params,
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size_t num_params, const struct tee_param *params);
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int (*from_msg_param)(struct optee *optee, struct tee_param *params,
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size_t num_params,
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const struct optee_msg_param *msg_params);
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};
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/**
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* struct optee - main service struct
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* @supp_teedev: supplicant device
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* @teedev: client device
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* @ops: internal callbacks for different ways to reach secure
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* world
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* @ctx: driver internal TEE context
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* @smc: specific to SMC ABI
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* @ffa: specific to FF-A ABI
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* @call_queue: queue of threads waiting to call @invoke_fn
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* @notif: notification synchronization struct
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* @supp: supplicant synchronization struct for RPC to supplicant
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* @pool: shared memory pool
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* @rpc_param_count: If > 0 number of RPC parameters to make room for
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* @scan_bus_done flag if device registation was already done.
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* @scan_bus_wq workqueue to scan optee bus and register optee drivers
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* @scan_bus_work workq to scan optee bus and register optee drivers
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*/
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struct optee {
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struct tee_device *supp_teedev;
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struct tee_device *teedev;
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const struct optee_ops *ops;
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struct tee_context *ctx;
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union {
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struct optee_smc smc;
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struct optee_ffa ffa;
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};
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struct optee_shm_arg_cache shm_arg_cache;
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struct optee_call_queue call_queue;
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struct optee_notif notif;
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struct optee_supp supp;
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struct tee_shm_pool *pool;
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unsigned int rpc_param_count;
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bool scan_bus_done;
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struct workqueue_struct *scan_bus_wq;
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struct work_struct scan_bus_work;
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};
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struct optee_session {
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struct list_head list_node;
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u32 session_id;
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};
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struct optee_context_data {
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/* Serializes access to this struct */
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struct mutex mutex;
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struct list_head sess_list;
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};
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struct optee_rpc_param {
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u32 a0;
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u32 a1;
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u32 a2;
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u32 a3;
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u32 a4;
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u32 a5;
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u32 a6;
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u32 a7;
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};
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/* Holds context that is preserved during one STD call */
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struct optee_call_ctx {
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/* information about pages list used in last allocation */
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void *pages_list;
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size_t num_entries;
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};
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int optee_notif_init(struct optee *optee, u_int max_key);
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void optee_notif_uninit(struct optee *optee);
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int optee_notif_wait(struct optee *optee, u_int key);
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int optee_notif_send(struct optee *optee, u_int key);
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u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
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struct tee_param *param);
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int optee_supp_read(struct tee_context *ctx, void __user *buf, size_t len);
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int optee_supp_write(struct tee_context *ctx, void __user *buf, size_t len);
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void optee_supp_init(struct optee_supp *supp);
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void optee_supp_uninit(struct optee_supp *supp);
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void optee_supp_release(struct optee_supp *supp);
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int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
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struct tee_param *param);
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int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
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struct tee_param *param);
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int optee_open_session(struct tee_context *ctx,
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struct tee_ioctl_open_session_arg *arg,
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struct tee_param *param);
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int optee_close_session_helper(struct tee_context *ctx, u32 session);
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int optee_close_session(struct tee_context *ctx, u32 session);
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int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
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struct tee_param *param);
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int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
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#define PTA_CMD_GET_DEVICES 0x0
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#define PTA_CMD_GET_DEVICES_SUPP 0x1
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int optee_enumerate_devices(u32 func);
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void optee_unregister_devices(void);
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int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
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size_t size, size_t align,
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int (*shm_register)(struct tee_context *ctx,
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struct tee_shm *shm,
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struct page **pages,
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size_t num_pages,
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unsigned long start));
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void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
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int (*shm_unregister)(struct tee_context *ctx,
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struct tee_shm *shm));
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void optee_remove_common(struct optee *optee);
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int optee_open(struct tee_context *ctx, bool cap_memref_null);
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void optee_release(struct tee_context *ctx);
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void optee_release_supp(struct tee_context *ctx);
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static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr,
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const struct optee_msg_param *mp)
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{
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p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
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attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
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p->u.value.a = mp->u.value.a;
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p->u.value.b = mp->u.value.b;
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p->u.value.c = mp->u.value.c;
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}
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static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
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const struct tee_param *p)
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{
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mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
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mp->u.value.a = p->u.value.a;
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mp->u.value.b = p->u.value.b;
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mp->u.value.c = p->u.value.c;
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}
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void optee_cq_wait_init(struct optee_call_queue *cq,
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struct optee_call_waiter *w);
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void optee_cq_wait_for_completion(struct optee_call_queue *cq,
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struct optee_call_waiter *w);
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void optee_cq_wait_final(struct optee_call_queue *cq,
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struct optee_call_waiter *w);
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int optee_check_mem_type(unsigned long start, size_t num_pages);
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void optee_shm_arg_cache_init(struct optee *optee, u32 flags);
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void optee_shm_arg_cache_uninit(struct optee *optee);
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struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx,
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size_t num_params,
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struct optee_shm_arg_entry **entry,
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struct tee_shm **shm_ret,
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u_int *offs);
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void optee_free_msg_arg(struct tee_context *ctx,
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struct optee_shm_arg_entry *entry, u_int offs);
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size_t optee_msg_arg_size(size_t rpc_param_count);
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struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
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void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);
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void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
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struct optee_msg_arg *arg);
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/*
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* Small helpers
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*/
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static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1)
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{
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return (void *)(unsigned long)(((u64)reg0 << 32) | reg1);
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}
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static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
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{
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*reg0 = val >> 32;
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*reg1 = val;
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}
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/* Registration of the ABIs */
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int optee_smc_abi_register(void);
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void optee_smc_abi_unregister(void);
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int optee_ffa_abi_register(void);
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void optee_ffa_abi_unregister(void);
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#endif /*OPTEE_PRIVATE_H*/
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