/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015-2024 Linaro Limited
*/
#ifndef __TEE_DRV_H
#define __TEE_DRV_H
#include <linux/device.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mod_devicetable.h>
#include <linux/tee.h>
#include <linux/types.h>
/*
* 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 address of the shared memory + offs if offs is within
* the bounds of this shared memory, else an ERR_PTR
*/
void *tee_shm_get_va(struct tee_shm *shm, size_t offs);
/**
* tee_shm_get_pa() - Get physical address of a shared memory plus an offset
* @shm: Shared memory handle
* @offs: Offset from start of this shared memory
* @pa: Physical address to return
* @returns 0 if offs is within the bounds of this shared memory, else an
* error code.
*/
int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa);
/**
* tee_shm_get_size() - Get size of shared memory buffer
* @shm: Shared memory handle
* @returns size of shared memory
*/
static inline size_t tee_shm_get_size(struct tee_shm *shm)
{
return shm->size;
}
/**
* tee_shm_get_pages() - Get list of pages that hold shared buffer
* @shm: Shared memory handle
* @num_pages: Number of pages will be stored there
* @returns pointer to pages array
*/
static inline struct page **tee_shm_get_pages(struct tee_shm *shm,
size_t *num_pages)
{
*num_pages = shm->num_pages;
return shm->pages;
}
/**
* tee_shm_get_page_offset() - Get shared buffer offset from page start
* @shm: Shared memory handle
* @returns page offset of shared buffer
*/
static inline size_t tee_shm_get_page_offset(struct tee_shm *shm)
{
return shm->offset;
}
/**
* tee_client_open_context() - Open a TEE context
* @start: if not NULL, continue search after this context
* @match: function to check TEE device
* @data: data for match function
* @vers: if not NULL, version data of TEE device of the context returned
*
* This function does an operation similar to open("/dev/teeX") in user space.
* A returned context must be released with tee_client_close_context().
*
* Returns a TEE context of the first TEE device matched by the match()
* callback or an ERR_PTR.
*/
struct tee_context *
tee_client_open_context(struct tee_context *start,
int (*match)(struct tee_ioctl_version_data *,
const void *),
const void *data, struct tee_ioctl_version_data *vers);
/**
* tee_client_close_context() - Close a TEE context
* @ctx: TEE context to close
*
* Note that all sessions previously opened with this context will be
* closed when this function is called.
*/
void tee_client_close_context(struct tee_context *ctx);
/**
* tee_client_get_version() - Query version of TEE
* @ctx: TEE context to TEE to query
* @vers: Pointer to version data
*/
void tee_client_get_version(struct tee_context *ctx,
struct tee_ioctl_version_data *vers);
/**
* tee_client_open_session() - Open a session to a Trusted Application
* @ctx: TEE context
* @arg: Open session arguments, see description of
* struct tee_ioctl_open_session_arg
* @param: Parameters passed to the Trusted Application
*
* Returns < 0 on error else see @arg->ret for result. If @arg->ret
* is TEEC_SUCCESS the session identifier is available in @arg->session.
*/
int tee_client_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
/**
* tee_client_close_session() - Close a session to a Trusted Application
* @ctx: TEE Context
* @session: Session id
*
* Return < 0 on error else 0, regardless the session will not be
* valid after this function has returned.
*/
int tee_client_close_session(struct tee_context *ctx, u32 session);
/**
* tee_client_system_session() - Declare session as a system session
* @ctx: TEE Context
* @session: Session id
*
* This function requests TEE to provision an entry context ready to use for
* that session only. The provisioned entry context is used for command
* invocation and session closure, not for command cancelling requests.
* TEE releases the provisioned context upon session closure.
*
* Return < 0 on error else 0 if an entry context has been provisioned.
*/
int tee_client_system_session(struct tee_context *ctx, u32 session);
/**
* tee_client_invoke_func() - Invoke a function in a Trusted Application
* @ctx: TEE Context
* @arg: Invoke arguments, see description of
* struct tee_ioctl_invoke_arg
* @param: Parameters passed to the Trusted Application
*
* Returns < 0 on error else see @arg->ret for result.
*/
int tee_client_invoke_func(struct tee_context *ctx,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param);
/**
* tee_client_cancel_req() - Request cancellation of the previous open-session
* or invoke-command operations in a Trusted Application
* @ctx: TEE Context
* @arg: Cancellation arguments, see description of
* struct tee_ioctl_cancel_arg
*
* Returns < 0 on error else 0 if the cancellation was successfully requested.
*/
int tee_client_cancel_req(struct tee_context *ctx,
struct tee_ioctl_cancel_arg *arg);
extern const struct bus_type tee_bus_type;
/**
* struct tee_client_device - tee based device
* @id: device identifier
* @dev: device structure
*/
struct tee_client_device {
struct tee_client_device_id id;
struct device dev;
};
#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev)
/**
* struct tee_client_driver - tee client driver
* @id_table: device id table supported by this driver
* @driver: driver structure
*/
struct tee_client_driver {
const struct tee_client_device_id *id_table;
struct device_driver driver;
};
#define to_tee_client_driver(d) \
container_of_const(d, struct tee_client_driver, driver)
#endif /*__TEE_DRV_H*/
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