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192.168.1.100 / T106_DC / 9ed821d7e5d875a3395740a9cc2545671fa429b7 / . / ap / os / linux / linux-3.4.x / drivers / scsi / sd.h
blob: e2b295681667fc6a7be1467af3e802f31b7a1de6 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -0700[diff] [blame^]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
18/*
19 * Number of allowed retries
20 */
21#define SD_MAX_RETRIES 5
22#define SD_PASSTHROUGH_RETRIES 1
23#define SD_MAX_MEDIUM_TIMEOUTS 2
24
25/*
26 * Size of the initial data buffer for mode and read capacity data
27 */
28#define SD_BUF_SIZE 512
29
30/*
31 * Number of sectors at the end of the device to avoid multi-sector
32 * accesses to in the case of last_sector_bug
33 */
34#define SD_LAST_BUGGY_SECTORS 8
35
36enum {
37 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
38 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
39};
40
41enum {
42 SD_LBP_FULL = 0, /* Full logical block provisioning */
43 SD_LBP_UNMAP, /* Use UNMAP command */
44 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
45 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
46 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
47 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
48};
49
50struct scsi_disk {
51 struct scsi_driver *driver; /* always &sd_template */
52 struct scsi_device *device;
53 struct device dev;
54 struct gendisk *disk;
55 atomic_t openers;
56 sector_t capacity; /* size in 512-byte sectors */
57 u32 max_ws_blocks;
58 u32 max_unmap_blocks;
59 u32 unmap_granularity;
60 u32 unmap_alignment;
61 u32 index;
62 unsigned int physical_block_size;
63 unsigned int max_medium_access_timeouts;
64 unsigned int medium_access_timed_out;
65 u8 media_present;
66 u8 write_prot;
67 u8 protection_type;/* Data Integrity Field */
68 u8 provisioning_mode;
69 unsigned ATO : 1; /* state of disk ATO bit */
70 unsigned cache_override : 1; /* temp override of WCE,RCD */
71 unsigned WCE : 1; /* state of disk WCE bit */
72 unsigned RCD : 1; /* state of disk RCD bit, unused */
73 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
74 unsigned first_scan : 1;
75 unsigned lbpme : 1;
76 unsigned lbprz : 1;
77 unsigned lbpu : 1;
78 unsigned lbpws : 1;
79 unsigned lbpws10 : 1;
80 unsigned lbpvpd : 1;
81};
82#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
83
84static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
85{
86 return container_of(disk->private_data, struct scsi_disk, driver);
87}
88
89#define sd_printk(prefix, sdsk, fmt, a...) \
90 (sdsk)->disk ? \
91 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
92 (sdsk)->disk->disk_name, ##a) : \
93 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
94
95static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
96{
97 switch (scmd->cmnd[0]) {
98 case READ_6:
99 case READ_10:
100 case READ_12:
101 case READ_16:
102 case SYNCHRONIZE_CACHE:
103 case VERIFY:
104 case VERIFY_12:
105 case VERIFY_16:
106 case WRITE_6:
107 case WRITE_10:
108 case WRITE_12:
109 case WRITE_16:
110 case WRITE_SAME:
111 case WRITE_SAME_16:
112 case UNMAP:
113 return 1;
114 case VARIABLE_LENGTH_CMD:
115 switch (scmd->cmnd[9]) {
116 case READ_32:
117 case VERIFY_32:
118 case WRITE_32:
119 case WRITE_SAME_32:
120 return 1;
121 }
122 }
123
124 return 0;
125}
126
127/*
128 * A DIF-capable target device can be formatted with different
129 * protection schemes. Currently 0 through 3 are defined:
130 *
131 * Type 0 is regular (unprotected) I/O
132 *
133 * Type 1 defines the contents of the guard and reference tags
134 *
135 * Type 2 defines the contents of the guard and reference tags and
136 * uses 32-byte commands to seed the latter
137 *
138 * Type 3 defines the contents of the guard tag only
139 */
140
141enum sd_dif_target_protection_types {
142 SD_DIF_TYPE0_PROTECTION = 0x0,
143 SD_DIF_TYPE1_PROTECTION = 0x1,
144 SD_DIF_TYPE2_PROTECTION = 0x2,
145 SD_DIF_TYPE3_PROTECTION = 0x3,
146};
147
148/*
149 * Data Integrity Field tuple.
150 */
151struct sd_dif_tuple {
152 __be16 guard_tag; /* Checksum */
153 __be16 app_tag; /* Opaque storage */
154 __be32 ref_tag; /* Target LBA or indirect LBA */
155};
156
157#ifdef CONFIG_BLK_DEV_INTEGRITY
158
159extern void sd_dif_config_host(struct scsi_disk *);
160extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
161extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
162
163#else /* CONFIG_BLK_DEV_INTEGRITY */
164
165static inline void sd_dif_config_host(struct scsi_disk *disk)
166{
167}
168static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
169{
170 return 0;
171}
172static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
173{
174}
175
176#endif /* CONFIG_BLK_DEV_INTEGRITY */
177
178#endif /* _SCSI_DISK_H */