linux-imx

/*

 * Block Translation Table library

 * Copyright (c) 2014-2015, Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 */

​

#ifndef _LINUX_BTT_H

#define _LINUX_BTT_H

​

#include <linux/badblocks.h>

#include <linux/types.h>

​

#define BTT_SIG_LEN 16

#define BTT_SIG "BTT_ARENA_INFO\0"

#define MAP_ENT_SIZE 4

#define MAP_TRIM_SHIFT 31

#define MAP_TRIM_MASK (1 << MAP_TRIM_SHIFT)

#define MAP_ERR_SHIFT 30

#define MAP_ERR_MASK (1 << MAP_ERR_SHIFT)

#define MAP_LBA_MASK (~((1 << MAP_TRIM_SHIFT) | (1 << MAP_ERR_SHIFT)))

#define MAP_ENT_NORMAL 0xC0000000

#define LOG_GRP_SIZE sizeof(struct log_group)

#define LOG_ENT_SIZE sizeof(struct log_entry)

#define ARENA_MIN_SIZE (1UL << 24)  /* 16 MB */

#define ARENA_MAX_SIZE (1ULL << 39) /* 512 GB */

#define RTT_VALID (1UL << 31)

#define RTT_INVALID 0

#define BTT_PG_SIZE 4096

#define BTT_DEFAULT_NFREE ND_MAX_LANES

#define LOG_SEQ_INIT 1

​

#define IB_FLAG_ERROR 0x00000001

#define IB_FLAG_ERROR_MASK 0x00000001

​

#define ent_lba(ent) (ent & MAP_LBA_MASK)

#define ent_e_flag(ent) (!!(ent & MAP_ERR_MASK))

#define ent_z_flag(ent) (!!(ent & MAP_TRIM_MASK))

#define set_e_flag(ent) (ent |= MAP_ERR_MASK)

/* 'normal' is both e and z flags set */

#define ent_normal(ent) (ent_e_flag(ent) && ent_z_flag(ent))

​

enum btt_init_state {

    INIT_UNCHECKED = 0,

    INIT_NOTFOUND,

    INIT_READY

};

​

/*

 * A log group represents one log 'lane', and consists of four log entries.

 * Two of the four entries are valid entries, and the remaining two are

 * padding. Due to an old bug in the padding location, we need to perform a

 * test to determine the padding scheme being used, and use that scheme

 * thereafter.

 *

 * In kernels prior to 4.15, 'log group' would have actual log entries at