tbt.h

/*
 * Copyright (C) 2012-2018, Samsung Electronics Co., Ltd.
 *
 * Transparent buffers translation
 */

#pragma once

#include <stdint.h>

#define DRIVER_IOCTL_MAX_ARGS   32  /* NB: Increase if you have a structure
                     * with a number of fields > 32.
                     */
#define MMAP_SHARE_ITEMS        (DRIVER_IOCTL_MAX_ARGS)

#define DESC_ATOM_IS_ARR_ITEM(atom) ((atom)->type >= DESC_ATOM_ARR_ITEM_0 \
                            && (atom)->type <= DESC_ATOM_ARR_ITEM_MAX)
#define DESC_ATOM_IS_ARR_CNT(atom)  ((atom)->type >= DESC_ATOM_ARR_CNT_0 \
                            && (atom)->type <= DESC_ATOM_ARR_CNT_MAX)
#define DESC_ATOM_IS_REF(atom)      ((atom)->type >= DESC_ATOM_REF_WR \
                            && (atom)->type <= DESC_ATOM_REF_DYN_MAX)
#define DESC_ATOM_ARR_ITEM_IDX(type)    (type - DESC_ATOM_ARR_ITEM_0)
#define DESC_ATOM_ARR_CNT_IDX(type) (type - DESC_ATOM_ARR_CNT_0)
#define DESC_ATOM_ARR_ITEM_ARR_CNT  (DESC_ATOM_ARR_ITEM_MAX - DESC_ATOM_ARR_ITEM_0 + 1)
#define DESC_ATOM_ARR_CNT_CNT       (DESC_ATOM_ARR_CNT_MAX - DESC_ATOM_ARR_CNT_0 + 1)
#define DESC_ATOM_DYN_CNT_CNT       (DESC_ATOM_DYN_CNT_MAX - DESC_ATOM_DYN_CNT_0 + 1)
#define DESC_MAX_SIZE           (PAGE_SIZE)

enum {
    IOCTL_DESC_STRUCT,
    IOCTL_DESC_REF,
    IOCTL_DESC_MAX,
};

enum {
    DESC_ATOM_VAL,
    DESC_ATOM_REF_WR,
    DESC_ATOM_REF_RW,
    DESC_ATOM_REF_RO,
    DESC_ATOM_REF_MAX = DESC_ATOM_REF_RO,
    DESC_ATOM_REF_DYN_0,
    DESC_ATOM_REF_DYN_1,
    DESC_ATOM_REF_DYN_MAX = DESC_ATOM_REF_DYN_1,
    DESC_ATOM_DYN_CNT_0,
    DESC_ATOM_DYN_CNT_1,
    DESC_ATOM_DYN_CNT_MAX = DESC_ATOM_DYN_CNT_1,
    DESC_ATOM_ARR_CNT_0,
    DESC_ATOM_ARR_CNT_1,
    DESC_ATOM_ARR_CNT_2,
    DESC_ATOM_ARR_CNT_3,
    DESC_ATOM_ARR_CNT_MAX = DESC_ATOM_ARR_CNT_3,
    DESC_ATOM_ARR_ITEM_0,
    DESC_ATOM_ARR_ITEM_1,
    DESC_ATOM_ARR_ITEM_2,
    DESC_ATOM_ARR_ITEM_3,
    DESC_ATOM_ARR_ITEM_MAX = DESC_ATOM_ARR_ITEM_3,
    DESC_ATOM_MAX,
};

_Static_assert(DESC_ATOM_ARR_CNT_MAX != DESC_ATOM_ARR_ITEM_MAX,
        "Count of array items descriptors does not match to count of counters")
;

struct desc_atom {
    uint32_t type;  
    uint32_t len;   
};

struct ioctl_desc {
    uint32_t cnt;   
    uint32_t type;  
    struct desc_atom tpl[DRIVER_IOCTL_MAX_ARGS];    
};