1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux 1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /* 2 /*
3 * Zoned block devices handling. 3 * Zoned block devices handling.
4 * 4 *
5 * Copyright (C) 2015 Seagate Technology PLC 5 * Copyright (C) 2015 Seagate Technology PLC
6 * 6 *
7 * Written by: Shaun Tancheff <shaun.tancheff@ 7 * Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
8 * 8 *
9 * Modified by: Damien Le Moal <damien.lemoal@ 9 * Modified by: Damien Le Moal <damien.lemoal@hgst.com>
10 * Copyright (C) 2016 Western Digital 10 * Copyright (C) 2016 Western Digital
11 * 11 *
12 * This file is licensed under the terms of t 12 * This file is licensed under the terms of the GNU General Public
13 * License version 2. This program is licensed 13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or im 14 * warranty of any kind, whether express or implied.
15 */ 15 */
16 #ifndef _UAPI_BLKZONED_H 16 #ifndef _UAPI_BLKZONED_H
17 #define _UAPI_BLKZONED_H 17 #define _UAPI_BLKZONED_H
18 18
19 #include <linux/types.h> 19 #include <linux/types.h>
20 #include <linux/ioctl.h> 20 #include <linux/ioctl.h>
21 21
22 /** 22 /**
23 * enum blk_zone_type - Types of zones allowed 23 * enum blk_zone_type - Types of zones allowed in a zoned device.
24 * 24 *
25 * @BLK_ZONE_TYPE_CONVENTIONAL: The zone has n 25 * @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
26 * randomly. Zone 26 * randomly. Zone reset has no effect on the zone.
27 * @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must 27 * @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
28 * @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can 28 * @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
29 * 29 *
30 * Any other value not defined is reserved and 30 * Any other value not defined is reserved and must be considered as invalid.
31 */ 31 */
32 enum blk_zone_type { 32 enum blk_zone_type {
33 BLK_ZONE_TYPE_CONVENTIONAL = 0x1, 33 BLK_ZONE_TYPE_CONVENTIONAL = 0x1,
34 BLK_ZONE_TYPE_SEQWRITE_REQ = 0x2, 34 BLK_ZONE_TYPE_SEQWRITE_REQ = 0x2,
35 BLK_ZONE_TYPE_SEQWRITE_PREF = 0x3, 35 BLK_ZONE_TYPE_SEQWRITE_PREF = 0x3,
36 }; 36 };
37 37
38 /** 38 /**
39 * enum blk_zone_cond - Condition [state] of a 39 * enum blk_zone_cond - Condition [state] of a zone in a zoned device.
40 * 40 *
41 * @BLK_ZONE_COND_NOT_WP: The zone has no writ 41 * @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
42 * @BLK_ZONE_COND_EMPTY: The zone is empty. 42 * @BLK_ZONE_COND_EMPTY: The zone is empty.
43 * @BLK_ZONE_COND_IMP_OPEN: The zone is open, 43 * @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
44 * @BLK_ZONE_COND_EXP_OPEN: The zones was expl 44 * @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
45 * OPEN ZONE command. 45 * OPEN ZONE command.
46 * @BLK_ZONE_COND_CLOSED: The zone was [explic 46 * @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
47 * @BLK_ZONE_COND_FULL: The zone is marked as 47 * @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
48 * FINISH ZONE command. 48 * FINISH ZONE command.
49 * @BLK_ZONE_COND_READONLY: The zone is read-o 49 * @BLK_ZONE_COND_READONLY: The zone is read-only.
50 * @BLK_ZONE_COND_OFFLINE: The zone is offline 50 * @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
51 * 51 *
52 * The Zone Condition state machine in the ZBC 52 * The Zone Condition state machine in the ZBC/ZAC standards maps the above
53 * deinitions as: 53 * deinitions as:
54 * - ZC1: Empty | BLK_ZONE_COND_EMPT !! 54 * - ZC1: Empty | BLK_ZONE_EMPTY
55 * - ZC2: Implicit Open | BLK_ZONE_COND_IMP_ 55 * - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
56 * - ZC3: Explicit Open | BLK_ZONE_COND_EXP_ 56 * - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
57 * - ZC4: Closed | BLK_ZONE_COND_CLOS !! 57 * - ZC4: Closed | BLK_ZONE_CLOSED
58 * - ZC5: Full | BLK_ZONE_COND_FULL !! 58 * - ZC5: Full | BLK_ZONE_FULL
59 * - ZC6: Read Only | BLK_ZONE_COND_READ !! 59 * - ZC6: Read Only | BLK_ZONE_READONLY
60 * - ZC7: Offline | BLK_ZONE_COND_OFFL !! 60 * - ZC7: Offline | BLK_ZONE_OFFLINE
61 * 61 *
62 * Conditions 0x5 to 0xC are reserved by the c 62 * Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
63 * be considered invalid. 63 * be considered invalid.
64 */ 64 */
65 enum blk_zone_cond { 65 enum blk_zone_cond {
66 BLK_ZONE_COND_NOT_WP = 0x0, 66 BLK_ZONE_COND_NOT_WP = 0x0,
67 BLK_ZONE_COND_EMPTY = 0x1, 67 BLK_ZONE_COND_EMPTY = 0x1,
68 BLK_ZONE_COND_IMP_OPEN = 0x2, 68 BLK_ZONE_COND_IMP_OPEN = 0x2,
69 BLK_ZONE_COND_EXP_OPEN = 0x3, 69 BLK_ZONE_COND_EXP_OPEN = 0x3,
70 BLK_ZONE_COND_CLOSED = 0x4, 70 BLK_ZONE_COND_CLOSED = 0x4,
71 BLK_ZONE_COND_READONLY = 0xD, 71 BLK_ZONE_COND_READONLY = 0xD,
72 BLK_ZONE_COND_FULL = 0xE, 72 BLK_ZONE_COND_FULL = 0xE,
73 BLK_ZONE_COND_OFFLINE = 0xF, 73 BLK_ZONE_COND_OFFLINE = 0xF,
74 }; 74 };
75 75
76 /** 76 /**
77 * enum blk_zone_report_flags - Feature flags <<
78 * <<
79 * @BLK_ZONE_REP_CAPACITY: Zone descriptor has <<
80 */ <<
81 enum blk_zone_report_flags { <<
82 BLK_ZONE_REP_CAPACITY = (1 << 0), <<
83 }; <<
84 <<
85 /** <<
86 * struct blk_zone - Zone descriptor for BLKRE 77 * struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
87 * 78 *
88 * @start: Zone start in 512 B sector units 79 * @start: Zone start in 512 B sector units
89 * @len: Zone length in 512 B sector units 80 * @len: Zone length in 512 B sector units
90 * @wp: Zone write pointer location in 512 B s 81 * @wp: Zone write pointer location in 512 B sector units
91 * @type: see enum blk_zone_type for possible 82 * @type: see enum blk_zone_type for possible values
92 * @cond: see enum blk_zone_cond for possible 83 * @cond: see enum blk_zone_cond for possible values
93 * @non_seq: Flag indicating that the zone is 84 * @non_seq: Flag indicating that the zone is using non-sequential resources
94 * (for host-aware zoned block devic 85 * (for host-aware zoned block devices only).
95 * @reset: Flag indicating that a zone reset i 86 * @reset: Flag indicating that a zone reset is recommended.
96 * @resv: Padding for 8B alignment. !! 87 * @reserved: Padding to 64 B to match the ZBC/ZAC defined zone descriptor size.
97 * @capacity: Zone usable capacity in 512 B se !! 88 *
98 * @reserved: Padding to 64 B to match the ZBC !! 89 * start, len and wp use the regular 512 B sector unit, regardless of the
99 * descriptor size. !! 90 * device logical block size. The overall structure size is 64 B to match the
100 * !! 91 * ZBC/ZAC defined zone descriptor and allow support for future additional
101 * start, len, capacity and wp use the regular !! 92 * zone information.
102 * of the device logical block size. The overa <<
103 * match the ZBC, ZAC and ZNS defined zone des <<
104 * future additional zone information. <<
105 */ 93 */
106 struct blk_zone { 94 struct blk_zone {
107 __u64 start; /* Zone start 95 __u64 start; /* Zone start sector */
108 __u64 len; /* Zone length 96 __u64 len; /* Zone length in number of sectors */
109 __u64 wp; /* Zone write 97 __u64 wp; /* Zone write pointer position */
110 __u8 type; /* Zone type * 98 __u8 type; /* Zone type */
111 __u8 cond; /* Zone condit 99 __u8 cond; /* Zone condition */
112 __u8 non_seq; /* Non-sequent 100 __u8 non_seq; /* Non-sequential write resources active */
113 __u8 reset; /* Reset write 101 __u8 reset; /* Reset write pointer recommended */
114 __u8 resv[4]; !! 102 __u8 reserved[36];
115 __u64 capacity; /* Zone capaci <<
116 __u8 reserved[24]; <<
117 }; 103 };
118 104
119 /** 105 /**
120 * struct blk_zone_report - BLKREPORTZONE ioct 106 * struct blk_zone_report - BLKREPORTZONE ioctl request/reply
121 * 107 *
122 * @sector: starting sector of report 108 * @sector: starting sector of report
123 * @nr_zones: IN maximum / OUT actual 109 * @nr_zones: IN maximum / OUT actual
124 * @flags: one or more flags as defined by enu !! 110 * @reserved: padding to 16 byte alignment
125 * @zones: Space to hold @nr_zones @zones entr 111 * @zones: Space to hold @nr_zones @zones entries on reply.
126 * 112 *
127 * The array of at most @nr_zones must follow 113 * The array of at most @nr_zones must follow this structure in memory.
128 */ 114 */
129 struct blk_zone_report { 115 struct blk_zone_report {
130 __u64 sector; 116 __u64 sector;
131 __u32 nr_zones; 117 __u32 nr_zones;
132 __u32 flags; !! 118 __u8 reserved[4];
133 struct blk_zone zones[]; !! 119 struct blk_zone zones[0];
134 }; 120 };
135 121
136 /** 122 /**
137 * struct blk_zone_range - BLKRESETZONE/BLKOPE !! 123 * struct blk_zone_range - BLKRESETZONE ioctl request
138 * BLKCLOSEZONE/BLKFIN !! 124 * @sector: starting sector of the first zone to issue reset write pointer
139 * requests !! 125 * @nr_sectors: Total number of sectors of 1 or more zones to reset
140 * @sector: Starting sector of the first zone <<
141 * @nr_sectors: Total number of sectors of all <<
142 */ 126 */
143 struct blk_zone_range { 127 struct blk_zone_range {
144 __u64 sector; 128 __u64 sector;
145 __u64 nr_sectors; 129 __u64 nr_sectors;
146 }; 130 };
147 131
148 /** 132 /**
149 * Zoned block device ioctl's: 133 * Zoned block device ioctl's:
150 * 134 *
151 * @BLKREPORTZONE: Get zone information. Takes 135 * @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
152 * The zone report will start 136 * The zone report will start from the zone containing the
153 * sector specified in the rep 137 * sector specified in the report request structure.
154 * @BLKRESETZONE: Reset the write pointer of t 138 * @BLKRESETZONE: Reset the write pointer of the zones in the specified
155 * sector range. The sector ran 139 * sector range. The sector range must be zone aligned.
156 * @BLKGETZONESZ: Get the device zone size in 140 * @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
157 * @BLKGETNRZONES: Get the total number of zon 141 * @BLKGETNRZONES: Get the total number of zones of the device.
158 * @BLKOPENZONE: Open the zones in the specifi <<
159 * The 512 B sector range must b <<
160 * @BLKCLOSEZONE: Close the zones in the speci <<
161 * The 512 B sector range must <<
162 * @BLKFINISHZONE: Mark the zones as full in t <<
163 * The 512 B sector range must <<
164 */ 142 */
165 #define BLKREPORTZONE _IOWR(0x12, 130, struc 143 #define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
166 #define BLKRESETZONE _IOW(0x12, 131, struct 144 #define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
167 #define BLKGETZONESZ _IOR(0x12, 132, __u32) 145 #define BLKGETZONESZ _IOR(0x12, 132, __u32)
168 #define BLKGETNRZONES _IOR(0x12, 133, __u32) 146 #define BLKGETNRZONES _IOR(0x12, 133, __u32)
169 #define BLKOPENZONE _IOW(0x12, 134, struct <<
170 #define BLKCLOSEZONE _IOW(0x12, 135, struct <<
171 #define BLKFINISHZONE _IOW(0x12, 136, struct <<
172 147
173 #endif /* _UAPI_BLKZONED_H */ 148 #endif /* _UAPI_BLKZONED_H */
174 149
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