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 */
32enum 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 */
65enum 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 */
94struct 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 */
115struct blk_zone_report {
116 __u64 sector;
117 __u32 nr_zones;
118 __u8 reserved[4];
119 struct blk_zone zones[0];
120};
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 */
127struct 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 * @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
141 * @BLKGETNRZONES: Get the total number of zones of the device.
142 */
143#define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
144#define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
145#define BLKGETZONESZ _IOR(0x12, 132, __u32)
146#define BLKGETNRZONES _IOR(0x12, 133, __u32)
147
148#endif /* _UAPI_BLKZONED_H */
149