summaryrefslogtreecommitdiff
path: root/include/uapi/linux/blkzoned.h
blob: f85743ef6e7d1990dc6234be1a87864740e02f8e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Zoned block devices handling.
 *
 * Copyright (C) 2015 Seagate Technology PLC
 *
 * Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
 *
 * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
 * Copyright (C) 2016 Western Digital
 *
 * This file is licensed under  the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */
#ifndef _UAPI_BLKZONED_H
#define _UAPI_BLKZONED_H

#include <linux/types.h>
#include <linux/ioctl.h>

/**
 * enum blk_zone_type - Types of zones allowed in a zoned device.
 *
 * @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
 *                              randomly. Zone reset has no effect on the zone.
 * @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
 * @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
 *
 * Any other value not defined is reserved and must be considered as invalid.
 */
enum blk_zone_type {
	BLK_ZONE_TYPE_CONVENTIONAL	= 0x1,
	BLK_ZONE_TYPE_SEQWRITE_REQ	= 0x2,
	BLK_ZONE_TYPE_SEQWRITE_PREF	= 0x3,
};

/**
 * enum blk_zone_cond - Condition [state] of a zone in a zoned device.
 *
 * @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
 * @BLK_ZONE_COND_EMPTY: The zone is empty.
 * @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
 * @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
 *                          OPEN ZONE command.
 * @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
 * @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
 *                      FINISH ZONE command.
 * @BLK_ZONE_COND_READONLY: The zone is read-only.
 * @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
 *
 * The Zone Condition state machine in the ZBC/ZAC standards maps the above
 * deinitions as:
 *   - ZC1: Empty         | BLK_ZONE_COND_EMPTY
 *   - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
 *   - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
 *   - ZC4: Closed        | BLK_ZONE_COND_CLOSED
 *   - ZC5: Full          | BLK_ZONE_COND_FULL
 *   - ZC6: Read Only     | BLK_ZONE_COND_READONLY
 *   - ZC7: Offline       | BLK_ZONE_COND_OFFLINE
 *
 * Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
 * be considered invalid.
 */
enum blk_zone_cond {
	BLK_ZONE_COND_NOT_WP	= 0x0,
	BLK_ZONE_COND_EMPTY	= 0x1,
	BLK_ZONE_COND_IMP_OPEN	= 0x2,
	BLK_ZONE_COND_EXP_OPEN	= 0x3,
	BLK_ZONE_COND_CLOSED	= 0x4,
	BLK_ZONE_COND_READONLY	= 0xD,
	BLK_ZONE_COND_FULL	= 0xE,
	BLK_ZONE_COND_OFFLINE	= 0xF,
};

/**
 * enum blk_zone_report_flags - Feature flags of reported zone descriptors.
 *
 * @BLK_ZONE_REP_CAPACITY: Zone descriptor has capacity field.
 */
enum blk_zone_report_flags {
	BLK_ZONE_REP_CAPACITY	= (1 << 0),
};

/**
 * struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
 *
 * @start: Zone start in 512 B sector units
 * @len: Zone length in 512 B sector units
 * @wp: Zone write pointer location in 512 B sector units
 * @type: see enum blk_zone_type for possible values
 * @cond: see enum blk_zone_cond for possible values
 * @non_seq: Flag indicating that the zone is using non-sequential resources
 *           (for host-aware zoned block devices only).
 * @reset: Flag indicating that a zone reset is recommended.
 * @resv: Padding for 8B alignment.
 * @capacity: Zone usable capacity in 512 B sector units
 * @reserved: Padding to 64 B to match the ZBC, ZAC and ZNS defined zone
 *            descriptor size.
 *
 * start, len, capacity and wp use the regular 512 B sector unit, regardless
 * of the device logical block size. The overall structure size is 64 B to
 * match the ZBC, ZAC and ZNS defined zone descriptor and allow support for
 * future additional zone information.
 */
struct blk_zone {
	__u64	start;		/* Zone start sector */
	__u64	len;		/* Zone length in number of sectors */
	__u64	wp;		/* Zone write pointer position */
	__u8	type;		/* Zone type */
	__u8	cond;		/* Zone condition */
	__u8	non_seq;	/* Non-sequential write resources active */
	__u8	reset;		/* Reset write pointer recommended */
	__u8	resv[4];
	__u64	capacity;	/* Zone capacity in number of sectors */
	__u8	reserved[24];
};

/**
 * struct blk_zone_report - BLKREPORTZONE ioctl request/reply
 *
 * @sector: starting sector of report
 * @nr_zones: IN maximum / OUT actual
 * @flags: one or more flags as defined by enum blk_zone_report_flags.
 * @zones: Space to hold @nr_zones @zones entries on reply.
 *
 * The array of at most @nr_zones must follow this structure in memory.
 */
struct blk_zone_report {
	__u64		sector;
	__u32		nr_zones;
	__u32		flags;
	struct blk_zone zones[];
};

/**
 * struct blk_zone_range - BLKRESETZONE/BLKOPENZONE/
 *                         BLKCLOSEZONE/BLKFINISHZONE ioctl
 *                         requests
 * @sector: Starting sector of the first zone to operate on.
 * @nr_sectors: Total number of sectors of all zones to operate on.
 */
struct blk_zone_range {
	__u64		sector;
	__u64		nr_sectors;
};

/**
 * Zoned block device ioctl's:
 *
 * @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
 *                 The zone report will start from the zone containing the
 *                 sector specified in the report request structure.
 * @BLKRESETZONE: Reset the write pointer of the zones in the specified
 *                sector range. The sector range must be zone aligned.
 * @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
 * @BLKGETNRZONES: Get the total number of zones of the device.
 * @BLKOPENZONE: Open the zones in the specified sector range.
 *               The 512 B sector range must be zone aligned.
 * @BLKCLOSEZONE: Close the zones in the specified sector range.
 *                The 512 B sector range must be zone aligned.
 * @BLKFINISHZONE: Mark the zones as full in the specified sector range.
 *                 The 512 B sector range must be zone aligned.
 */
#define BLKREPORTZONE	_IOWR(0x12, 130, struct blk_zone_report)
#define BLKRESETZONE	_IOW(0x12, 131, struct blk_zone_range)
#define BLKGETZONESZ	_IOR(0x12, 132, __u32)
#define BLKGETNRZONES	_IOR(0x12, 133, __u32)
#define BLKOPENZONE	_IOW(0x12, 134, struct blk_zone_range)
#define BLKCLOSEZONE	_IOW(0x12, 135, struct blk_zone_range)
#define BLKFINISHZONE	_IOW(0x12, 136, struct blk_zone_range)

#endif /* _UAPI_BLKZONED_H */