linux-headers (unknown)
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 _BLKZONED_H
17 #define _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 * enum blk_zone_report_flags - Feature flags of reported zone descriptors.
78 *
79 * @BLK_ZONE_REP_CAPACITY: Zone descriptor has capacity field.
80 */
81 enum blk_zone_report_flags {
82 BLK_ZONE_REP_CAPACITY = (1 << 0),
83 };
84
85 /**
86 * struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
87 *
88 * @start: Zone start in 512 B sector units
89 * @len: Zone length in 512 B sector units
90 * @wp: Zone write pointer location in 512 B sector units
91 * @type: see enum blk_zone_type for possible values
92 * @cond: see enum blk_zone_cond for possible values
93 * @non_seq: Flag indicating that the zone is using non-sequential resources
94 * (for host-aware zoned block devices only).
95 * @reset: Flag indicating that a zone reset is recommended.
96 * @resv: Padding for 8B alignment.
97 * @capacity: Zone usable capacity in 512 B sector units
98 * @reserved: Padding to 64 B to match the ZBC, ZAC and ZNS defined zone
99 * descriptor size.
100 *
101 * start, len, capacity and wp use the regular 512 B sector unit, regardless
102 * of the device logical block size. The overall structure size is 64 B to
103 * match the ZBC, ZAC and ZNS defined zone descriptor and allow support for
104 * future additional zone information.
105 */
106 struct blk_zone {
107 __u64 start; /* Zone start sector */
108 __u64 len; /* Zone length in number of sectors */
109 __u64 wp; /* Zone write pointer position */
110 __u8 type; /* Zone type */
111 __u8 cond; /* Zone condition */
112 __u8 non_seq; /* Non-sequential write resources active */
113 __u8 reset; /* Reset write pointer recommended */
114 __u8 resv[4];
115 __u64 capacity; /* Zone capacity in number of sectors */
116 __u8 reserved[24];
117 };
118
119 /**
120 * struct blk_zone_report - BLKREPORTZONE ioctl request/reply
121 *
122 * @sector: starting sector of report
123 * @nr_zones: IN maximum / OUT actual
124 * @flags: one or more flags as defined by enum blk_zone_report_flags.
125 * @zones: Space to hold @nr_zones @zones entries on reply.
126 *
127 * The array of at most @nr_zones must follow this structure in memory.
128 */
129 struct blk_zone_report {
130 __u64 sector;
131 __u32 nr_zones;
132 __u32 flags;
133 struct blk_zone zones[];
134 };
135
136 /**
137 * struct blk_zone_range - BLKRESETZONE/BLKOPENZONE/
138 * BLKCLOSEZONE/BLKFINISHZONE ioctl
139 * requests
140 * @sector: Starting sector of the first zone to operate on.
141 * @nr_sectors: Total number of sectors of all zones to operate on.
142 */
143 struct blk_zone_range {
144 __u64 sector;
145 __u64 nr_sectors;
146 };
147
148 /**
149 * Zoned block device ioctl's:
150 *
151 * @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
152 * The zone report will start from the zone containing the
153 * sector specified in the report request structure.
154 * @BLKRESETZONE: Reset the write pointer of the zones in the specified
155 * sector range. The sector range must be zone aligned.
156 * @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
157 * @BLKGETNRZONES: Get the total number of zones of the device.
158 * @BLKOPENZONE: Open the zones in the specified sector range.
159 * The 512 B sector range must be zone aligned.
160 * @BLKCLOSEZONE: Close the zones in the specified sector range.
161 * The 512 B sector range must be zone aligned.
162 * @BLKFINISHZONE: Mark the zones as full in the specified sector range.
163 * The 512 B sector range must be zone aligned.
164 */
165 #define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
166 #define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
167 #define BLKGETZONESZ _IOR(0x12, 132, __u32)
168 #define BLKGETNRZONES _IOR(0x12, 133, __u32)
169 #define BLKOPENZONE _IOW(0x12, 134, struct blk_zone_range)
170 #define BLKCLOSEZONE _IOW(0x12, 135, struct blk_zone_range)
171 #define BLKFINISHZONE _IOW(0x12, 136, struct blk_zone_range)
172
173 #endif /* _BLKZONED_H */
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