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[
|-۾ # [/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015-2024 Linaro Limited
*/
#ifndef __TEE_DRV_H
#define __TEE_DRV_H
#include
#include
#include
#include
#include
#include
/*
* The file describes the API provided by the TEE subsystem to the
* TEE client drivers.
*/
struct tee_device;
/**
* struct tee_context - driver specific context on file pointer data
* @teedev: pointer to this drivers struct tee_device
* @data: driver specific context data, managed by the driver
* @refcount: reference counter for this structure
* @releasing: flag that indicates if context is being released right now.
* It is needed to break circular dependency on context during
* shared memory release.
* @supp_nowait: flag that indicates that requests in this context should not
* wait for tee-supplicant daemon to be started if not present
* and just return with an error code. It is needed for requests
* that arises from TEE based kernel drivers that should be
* non-blocking in nature.
* @cap_memref_null: flag indicating if the TEE Client support shared
* memory buffer with a NULL pointer.
*/
struct tee_context {
struct tee_device *teedev;
void *data;
struct kref refcount;
bool releasing;
bool supp_nowait;
bool cap_memref_null;
};
/**
* struct tee_shm - shared memory object
* @ctx: context using the object
* @paddr: physical address of the shared memory
* @kaddr: virtual address of the shared memory
* @size: size of shared memory
* @offset: offset of buffer in user space
* @pages: locked pages from userspace
* @num_pages: number of locked pages
* @refcount: reference counter
* @flags: defined by TEE_SHM_* in tee_core.h
* @id: unique id of a shared memory object on this device, shared
* with user space
* @sec_world_id:
* secure world assigned id of this shared memory object, not
* used by all drivers
*/
struct tee_shm {
struct tee_context *ctx;
phys_addr_t paddr;
void *kaddr;
size_t size;
unsigned int offset;
struct page **pages;
size_t num_pages;
refcount_t refcount;
u32 flags;
int id;
u64 sec_world_id;
};
struct tee_param_memref {
size_t shm_offs;
size_t size;
struct tee_shm *shm;
};
struct tee_param_value {
u64 a;
u64 b;
u64 c;
};
struct tee_param {
u64 attr;
union {
struct tee_param_memref memref;
struct tee_param_value value;
} u;
};
/**
* tee_shm_alloc_kernel_buf() - Allocate kernel shared memory for a
* particular TEE client driver
* @ctx: The TEE context for shared memory allocation
* @size: Shared memory allocation size
* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
*/
struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
/**
* tee_shm_register_kernel_buf() - Register kernel shared memory for a
* particular TEE client driver
* @ctx: The TEE context for shared memory registration
* @addr: Kernel buffer address
* @length: Kernel buffer length
* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
*/
struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
void *addr, size_t length);
/**
* tee_shm_free() - Free shared memory
* @shm: Handle to shared memory to free
*/
void tee_shm_free(struct tee_shm *shm);
/**
* tee_shm_get_va() - Get virtual address of a shared memory plus an offset
* @shm: Shared memory handle
* @offs: Offset from start of this shared memory
* @returns virtual addre