279 lines
8.3 KiB
C
279 lines
8.3 KiB
C
/*
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* Copyright (c) 2015-2016, Linaro Limited
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __TEE_DRV_H
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#define __TEE_DRV_H
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#include <linux/types.h>
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#include <linux/idr.h>
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#include <linux/list.h>
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#include <linux/tee.h>
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/*
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* The file describes the API provided by the generic TEE driver to the
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* specific TEE driver.
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*/
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#define TEE_SHM_MAPPED 0x1 /* Memory mapped by the kernel */
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#define TEE_SHM_DMA_BUF 0x2 /* Memory with dma-buf handle */
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struct device;
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struct tee_device;
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struct tee_shm;
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struct tee_shm_pool;
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/**
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* struct tee_context - driver specific context on file pointer data
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* @teedev: pointer to this drivers struct tee_device
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* @list_shm: List of shared memory object owned by this context
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* @data: driver specific context data, managed by the driver
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*/
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struct tee_context {
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struct tee_device *teedev;
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struct list_head list_shm;
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void *data;
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};
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struct tee_param_memref {
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size_t shm_offs;
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size_t size;
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struct tee_shm *shm;
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};
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struct tee_param_value {
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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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struct tee_param {
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u64 attr;
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union {
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struct tee_param_memref memref;
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struct tee_param_value value;
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} u;
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};
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/**
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* struct tee_driver_ops - driver operations vtable
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* @get_version: returns version of driver
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* @open: called when the device file is opened
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* @release: release this open file
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* @open_session: open a new session
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* @close_session: close a session
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* @invoke_func: invoke a trusted function
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* @cancel_req: request cancel of an ongoing invoke or open
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* @supp_revc: called for supplicant to get a command
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* @supp_send: called for supplicant to send a response
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*/
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struct tee_driver_ops {
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void (*get_version)(struct tee_device *teedev,
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struct tee_ioctl_version_data *vers);
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int (*open)(struct tee_context *ctx);
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void (*release)(struct tee_context *ctx);
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int (*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 (*close_session)(struct tee_context *ctx, u32 session);
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int (*invoke_func)(struct tee_context *ctx,
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struct tee_ioctl_invoke_arg *arg,
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struct tee_param *param);
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int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session);
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int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params,
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struct tee_param *param);
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int (*supp_send)(struct tee_context *ctx, u32 ret, u32 num_params,
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struct tee_param *param);
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};
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/**
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* struct tee_desc - Describes the TEE driver to the subsystem
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* @name: name of driver
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* @ops: driver operations vtable
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* @owner: module providing the driver
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* @flags: Extra properties of driver, defined by TEE_DESC_* below
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*/
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#define TEE_DESC_PRIVILEGED 0x1
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struct tee_desc {
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const char *name;
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const struct tee_driver_ops *ops;
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struct module *owner;
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u32 flags;
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};
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/**
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* tee_device_alloc() - Allocate a new struct tee_device instance
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* @teedesc: Descriptor for this driver
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* @dev: Parent device for this device
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* @pool: Shared memory pool, NULL if not used
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* @driver_data: Private driver data for this device
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*
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* Allocates a new struct tee_device instance. The device is
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* removed by tee_device_unregister().
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*
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* @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
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*/
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struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
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struct device *dev,
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struct tee_shm_pool *pool,
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void *driver_data);
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/**
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* tee_device_register() - Registers a TEE device
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* @teedev: Device to register
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*
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* tee_device_unregister() need to be called to remove the @teedev if
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* this function fails.
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*
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* @returns < 0 on failure
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*/
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int tee_device_register(struct tee_device *teedev);
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/**
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* tee_device_unregister() - Removes a TEE device
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* @teedev: Device to unregister
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*
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* This function should be called to remove the @teedev even if
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* tee_device_register() hasn't been called yet. Does nothing if
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* @teedev is NULL.
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*/
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void tee_device_unregister(struct tee_device *teedev);
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/**
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* struct tee_shm_pool_mem_info - holds information needed to create a shared
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* memory pool
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* @vaddr: Virtual address of start of pool
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* @paddr: Physical address of start of pool
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* @size: Size in bytes of the pool
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*/
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struct tee_shm_pool_mem_info {
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unsigned long vaddr;
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phys_addr_t paddr;
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size_t size;
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};
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/**
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* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
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* memory range
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* @priv_info: Information for driver private shared memory pool
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* @dmabuf_info: Information for dma-buf shared memory pool
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*
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* Start and end of pools will must be page aligned.
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*
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* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
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* in @dmabuf, others will use the range provided by @priv.
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*
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* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
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*/
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struct tee_shm_pool *
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tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
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struct tee_shm_pool_mem_info *dmabuf_info);
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/**
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* tee_shm_pool_free() - Free a shared memory pool
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* @pool: The shared memory pool to free
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*
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* The must be no remaining shared memory allocated from this pool when
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* this function is called.
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*/
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void tee_shm_pool_free(struct tee_shm_pool *pool);
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/**
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* tee_get_drvdata() - Return driver_data pointer
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* @returns the driver_data pointer supplied to tee_register().
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*/
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void *tee_get_drvdata(struct tee_device *teedev);
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/**
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* tee_shm_alloc() - Allocate shared memory
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* @ctx: Context that allocates the shared memory
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* @size: Requested size of shared memory
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* @flags: Flags setting properties for the requested shared memory.
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*
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* Memory allocated as global shared memory is automatically freed when the
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* TEE file pointer is closed. The @flags field uses the bits defined by
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* TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If
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* TEE_SHM_DMA_BUF global shared memory will be allocated and associated
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* with a dma-buf handle, else driver private memory.
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*
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* @returns a pointer to 'struct tee_shm'
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*/
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struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
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/**
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* tee_shm_free() - Free shared memory
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* @shm: Handle to shared memory to free
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*/
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void tee_shm_free(struct tee_shm *shm);
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/**
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* tee_shm_put() - Decrease reference count on a shared memory handle
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* @shm: Shared memory handle
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*/
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void tee_shm_put(struct tee_shm *shm);
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/**
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* tee_shm_va2pa() - Get physical address of a virtual address
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* @shm: Shared memory handle
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* @va: Virtual address to tranlsate
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* @pa: Returned physical address
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* @returns 0 on success and < 0 on failure
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*/
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int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa);
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/**
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* tee_shm_pa2va() - Get virtual address of a physical address
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* @shm: Shared memory handle
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* @pa: Physical address to tranlsate
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* @va: Returned virtual address
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* @returns 0 on success and < 0 on failure
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*/
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int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va);
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/**
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* tee_shm_get_va() - Get virtual address of a shared memory plus an offset
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* @shm: Shared memory handle
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* @offs: Offset from start of this shared memory
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* @returns virtual address of the shared memory + offs if offs is within
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* the bounds of this shared memory, else an ERR_PTR
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*/
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void *tee_shm_get_va(struct tee_shm *shm, size_t offs);
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/**
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* tee_shm_get_pa() - Get physical address of a shared memory plus an offset
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* @shm: Shared memory handle
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* @offs: Offset from start of this shared memory
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* @pa: Physical address to return
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* @returns 0 if offs is within the bounds of this shared memory, else an
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* error code.
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*/
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int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa);
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/**
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* tee_shm_get_id() - Get id of a shared memory object
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* @shm: Shared memory handle
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* @returns id
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*/
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int tee_shm_get_id(struct tee_shm *shm);
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/**
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* tee_shm_get_from_id() - Find shared memory object and increase reference
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* count
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* @ctx: Context owning the shared memory
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* @id: Id of shared memory object
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* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
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*/
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struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id);
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#endif /*__TEE_DRV_H*/
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