include/uapi/linux/blkzoned.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Zoned block devices handling.
   4  *
   5  * Copyright (C) 2015 Seagate Technology PLC
   6  *
   7  * Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
   8  *
   9  * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
  10  * Copyright (C) 2016 Western Digital
  11  *
  12  * This file is licensed under  the terms of the GNU General Public
  13  * License version 2. This program is licensed "as is" without any
  14  * warranty of any kind, whether express or implied.
  15  */
  16 #ifndef _UAPI_BLKZONED_H
  17 #define _UAPI_BLKZONED_H
  18
  19 #include <linux/types.h>
  20 #include <linux/ioctl.h>
  21
  22 /**
  23  * enum blk_zone_type - Types of zones allowed in a zoned device.
  24  *
  25  * @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
  26  *                              randomly. Zone reset has no effect on the zone.
  27  * @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
  28  * @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
  29  *
  30  * Any other value not defined is reserved and must be considered as invalid.
  31  */
  32 enum blk_zone_type {
  33         BLK_ZONE_TYPE_CONVENTIONAL      = 0x1,
  34         BLK_ZONE_TYPE_SEQWRITE_REQ      = 0x2,
  35         BLK_ZONE_TYPE_SEQWRITE_PREF     = 0x3,
  36 };
  37
  38 /**
  39  * enum blk_zone_cond - Condition [state] of a zone in a zoned device.
  40  *
  41  * @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
  42  * @BLK_ZONE_COND_EMPTY: The zone is empty.
  43  * @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
  44  * @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
  45  *                          OPEN ZONE command.
  46  * @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
  47  * @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
  48  *                      FINISH ZONE command.
  49  * @BLK_ZONE_COND_READONLY: The zone is read-only.
  50  * @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
  51  *
  52  * The Zone Condition state machine in the ZBC/ZAC standards maps the above
  53  * deinitions as:
  54  *   - ZC1: Empty         | BLK_ZONE_EMPTY
  55  *   - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
  56  *   - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
  57  *   - ZC4: Closed        | BLK_ZONE_CLOSED
  58  *   - ZC5: Full          | BLK_ZONE_FULL
  59  *   - ZC6: Read Only     | BLK_ZONE_READONLY
  60  *   - ZC7: Offline       | BLK_ZONE_OFFLINE
  61  *
  62  * Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
  63  * be considered invalid.
  64  */
  65 enum blk_zone_cond {
  66         BLK_ZONE_COND_NOT_WP    = 0x0,
  67         BLK_ZONE_COND_EMPTY     = 0x1,
  68         BLK_ZONE_COND_IMP_OPEN  = 0x2,
  69         BLK_ZONE_COND_EXP_OPEN  = 0x3,
  70         BLK_ZONE_COND_CLOSED    = 0x4,
  71         BLK_ZONE_COND_READONLY  = 0xD,
  72         BLK_ZONE_COND_FULL      = 0xE,
  73         BLK_ZONE_COND_OFFLINE   = 0xF,
  74 };
  75
  76 /**
  77  * struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
  78  *
  79  * @start: Zone start in 512 B sector units
  80  * @len: Zone length in 512 B sector units
  81  * @wp: Zone write pointer location in 512 B sector units
  82  * @type: see enum blk_zone_type for possible values
  83  * @cond: see enum blk_zone_cond for possible values
  84  * @non_seq: Flag indicating that the zone is using non-sequential resources
  85  *           (for host-aware zoned block devices only).
  86  * @reset: Flag indicating that a zone reset is recommended.
  87  * @reserved: Padding to 64 B to match the ZBC/ZAC defined zone descriptor size.
  88  *
  89  * start, len and wp use the regular 512 B sector unit, regardless of the
  90  * device logical block size. The overall structure size is 64 B to match the
  91  * ZBC/ZAC defined zone descriptor and allow support for future additional
  92  * zone information.
  93  */
  94 struct blk_zone {
  95         __u64   start;          /* Zone start sector */
  96         __u64   len;            /* Zone length in number of sectors */
  97         __u64   wp;             /* Zone write pointer position */
  98         __u8    type;           /* Zone type */
  99         __u8    cond;           /* Zone condition */
 100         __u8    non_seq;        /* Non-sequential write resources active */
 101         __u8    reset;          /* Reset write pointer recommended */
 102         __u8    reserved[36];
 103 };
 104
 105 /**
 106  * struct blk_zone_report - BLKREPORTZONE ioctl request/reply
 107  *
 108  * @sector: starting sector of report
 109  * @nr_zones: IN maximum / OUT actual
 110  * @reserved: padding to 16 byte alignment
 111  * @zones: Space to hold @nr_zones @zones entries on reply.
 112  *
 113  * The array of at most @nr_zones must follow this structure in memory.
 114  */
 115 struct blk_zone_report {
 116         __u64           sector;
 117         __u32           nr_zones;
 118         __u8            reserved[4];
 119         struct blk_zone zones[0];
 120 } __packed;
 121
 122 /**
 123  * struct blk_zone_range - BLKRESETZONE ioctl request
 124  * @sector: starting sector of the first zone to issue reset write pointer
 125  * @nr_sectors: Total number of sectors of 1 or more zones to reset
 126  */
 127 struct blk_zone_range {
 128         __u64           sector;
 129         __u64           nr_sectors;
 130 };
 131
 132 /**
 133  * Zoned block device ioctl's:
 134  *
 135  * @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
 136  *                 The zone report will start from the zone containing the
 137  *                 sector specified in the report request structure.
 138  * @BLKRESETZONE: Reset the write pointer of the zones in the specified
 139  *                sector range. The sector range must be zone aligned.
 140  */
 141 #define BLKREPORTZONE   _IOWR(0x12, 130, struct blk_zone_report)
 142 #define BLKRESETZONE    _IOW(0x12, 131, struct blk_zone_range)
 143
 144 #endif /* _UAPI_BLKZONED_H */