tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _SCSI_DISK_H
2#define _SCSI_DISK_H
3
4/*
5 * More than enough for everybody ;) The huge number of majors
6 * is a leftover from 16bit dev_t days, we don't really need that
7 * much numberspace.
8 */
9#define SD_MAJORS 16
10
11/*
12 * Time out in seconds for disks and Magneto-opticals (which are slower).
13 */
14#define SD_TIMEOUT (30 * HZ)
15#define SD_MOD_TIMEOUT (75 * HZ)
16#define SD_FLUSH_TIMEOUT (60 * HZ)
17#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
18
19/*
20 * Number of allowed retries
21 */
22#define SD_MAX_RETRIES 5
23#define SD_PASSTHROUGH_RETRIES 1
24#define SD_MAX_MEDIUM_TIMEOUTS 2
25
26/*
27 * Size of the initial data buffer for mode and read capacity data
28 */
29#define SD_BUF_SIZE 512
30
31/*
32 * Number of sectors at the end of the device to avoid multi-sector
33 * accesses to in the case of last_sector_bug
34 */
35#define SD_LAST_BUGGY_SECTORS 8
36
37enum {
38 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
39 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
40};
41
42enum {
43 SD_MAX_WS10_BLOCKS = 0xffff,
44 SD_MAX_WS16_BLOCKS = 0x7fffff,
45};
46
47enum {
48 SD_LBP_FULL = 0, /* Full logical block provisioning */
49 SD_LBP_UNMAP, /* Use UNMAP command */
50 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
51 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
52 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
53 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
54};
55
56struct scsi_disk {
57 struct scsi_driver *driver; /* always &sd_template */
58 struct scsi_device *device;
59 struct device dev;
60 struct gendisk *disk;
61 atomic_t openers;
62 sector_t capacity; /* size in 512-byte sectors */
63 u32 max_ws_blocks;
64 u32 max_unmap_blocks;
65 u32 unmap_granularity;
66 u32 unmap_alignment;
67 u32 index;
68 unsigned int physical_block_size;
69 unsigned int max_medium_access_timeouts;
70 unsigned int medium_access_timed_out;
71 u8 media_present;
72 u8 write_prot;
73 u8 protection_type;/* Data Integrity Field */
74 u8 provisioning_mode;
75 unsigned ATO : 1; /* state of disk ATO bit */
76 unsigned WCE : 1; /* state of disk WCE bit */
77 unsigned RCD : 1; /* state of disk RCD bit, unused */
78 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
79 unsigned first_scan : 1;
80 unsigned lbpme : 1;
81 unsigned lbprz : 1;
82 unsigned lbpu : 1;
83 unsigned lbpws : 1;
84 unsigned lbpws10 : 1;
85 unsigned lbpvpd : 1;
86 unsigned ws16 : 1;
87};
88#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
89
90static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
91{
92 return container_of(disk->private_data, struct scsi_disk, driver);
93}
94
95#define sd_printk(prefix, sdsk, fmt, a...) \
96 (sdsk)->disk ? \
97 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
98 (sdsk)->disk->disk_name, ##a) : \
99 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
100
101static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
102{
103 switch (scmd->cmnd[0]) {
104 case READ_6:
105 case READ_10:
106 case READ_12:
107 case READ_16:
108 case SYNCHRONIZE_CACHE:
109 case VERIFY:
110 case VERIFY_12:
111 case VERIFY_16:
112 case WRITE_6:
113 case WRITE_10:
114 case WRITE_12:
115 case WRITE_16:
116 case WRITE_SAME:
117 case WRITE_SAME_16:
118 case UNMAP:
119 return 1;
120 case VARIABLE_LENGTH_CMD:
121 switch (scmd->cmnd[9]) {
122 case READ_32:
123 case VERIFY_32:
124 case WRITE_32:
125 case WRITE_SAME_32:
126 return 1;
127 }
128 }
129
130 return 0;
131}
132
133/*
134 * A DIF-capable target device can be formatted with different
135 * protection schemes. Currently 0 through 3 are defined:
136 *
137 * Type 0 is regular (unprotected) I/O
138 *
139 * Type 1 defines the contents of the guard and reference tags
140 *
141 * Type 2 defines the contents of the guard and reference tags and
142 * uses 32-byte commands to seed the latter
143 *
144 * Type 3 defines the contents of the guard tag only
145 */
146
147enum sd_dif_target_protection_types {
148 SD_DIF_TYPE0_PROTECTION = 0x0,
149 SD_DIF_TYPE1_PROTECTION = 0x1,
150 SD_DIF_TYPE2_PROTECTION = 0x2,
151 SD_DIF_TYPE3_PROTECTION = 0x3,
152};
153
154/*
155 * Data Integrity Field tuple.
156 */
157struct sd_dif_tuple {
158 __be16 guard_tag; /* Checksum */
159 __be16 app_tag; /* Opaque storage */
160 __be32 ref_tag; /* Target LBA or indirect LBA */
161};
162
163#ifdef CONFIG_BLK_DEV_INTEGRITY
164
165extern void sd_dif_config_host(struct scsi_disk *);
166extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
167extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
168
169#else /* CONFIG_BLK_DEV_INTEGRITY */
170
171static inline void sd_dif_config_host(struct scsi_disk *disk)
172{
173}
174static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
175{
176 return 0;
177}
178static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
179{
180}
181
182#endif /* CONFIG_BLK_DEV_INTEGRITY */
183
184#endif /* _SCSI_DISK_H */