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
24 /*
25 * Size of the initial data buffer for mode and read capacity data
26 */
27 #define SD_BUF_SIZE 512
28
29 /*
30 * Number of sectors at the end of the device to avoid multi-sector
31 * accesses to in the case of last_sector_bug
32 */
33 #define SD_LAST_BUGGY_SECTORS 8
34
35 enum {
36 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
37 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
38 };
39
40 enum {
41 SD_LBP_FULL = 0, /* Full logical block provisioning */
42 SD_LBP_UNMAP, /* Use UNMAP command */
43 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
44 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
45 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
46 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
47 };
48
49 struct scsi_disk {
50 struct scsi_driver *driver; /* always &sd_template */
51 struct scsi_device *device;
52 struct device dev;
53 struct gendisk *disk;
54 atomic_t openers;
55 sector_t capacity; /* size in 512-byte sectors */
56 u32 max_ws_blocks;
57 u32 max_unmap_blocks;
58 u32 unmap_granularity;
59 u32 unmap_alignment;
60 u32 index;
61 unsigned int physical_block_size;
62 u8 media_present;
63 u8 write_prot;
64 u8 protection_type;/* Data Integrity Field */
65 u8 provisioning_mode;
66 unsigned ATO : 1; /* state of disk ATO bit */
67 unsigned WCE : 1; /* state of disk WCE bit */
68 unsigned RCD : 1; /* state of disk RCD bit, unused */
69 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
70 unsigned first_scan : 1;
71 unsigned lbpme : 1;
72 unsigned lbprz : 1;
73 unsigned lbpu : 1;
74 unsigned lbpws : 1;
75 unsigned lbpws10 : 1;
76 unsigned lbpvpd : 1;
77 };
78 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
79
scsi_disk(struct gendisk * disk)80 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
81 {
82 return container_of(disk->private_data, struct scsi_disk, driver);
83 }
84
85 #define sd_printk(prefix, sdsk, fmt, a...) \
86 (sdsk)->disk ? \
87 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
88 (sdsk)->disk->disk_name, ##a) : \
89 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
90
91 /*
92 * A DIF-capable target device can be formatted with different
93 * protection schemes. Currently 0 through 3 are defined:
94 *
95 * Type 0 is regular (unprotected) I/O
96 *
97 * Type 1 defines the contents of the guard and reference tags
98 *
99 * Type 2 defines the contents of the guard and reference tags and
100 * uses 32-byte commands to seed the latter
101 *
102 * Type 3 defines the contents of the guard tag only
103 */
104
105 enum sd_dif_target_protection_types {
106 SD_DIF_TYPE0_PROTECTION = 0x0,
107 SD_DIF_TYPE1_PROTECTION = 0x1,
108 SD_DIF_TYPE2_PROTECTION = 0x2,
109 SD_DIF_TYPE3_PROTECTION = 0x3,
110 };
111
112 /*
113 * Data Integrity Field tuple.
114 */
115 struct sd_dif_tuple {
116 __be16 guard_tag; /* Checksum */
117 __be16 app_tag; /* Opaque storage */
118 __be32 ref_tag; /* Target LBA or indirect LBA */
119 };
120
121 #ifdef CONFIG_BLK_DEV_INTEGRITY
122
123 extern void sd_dif_config_host(struct scsi_disk *);
124 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
125 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
126
127 #else /* CONFIG_BLK_DEV_INTEGRITY */
128
sd_dif_config_host(struct scsi_disk * disk)129 static inline void sd_dif_config_host(struct scsi_disk *disk)
130 {
131 }
sd_dif_prepare(struct request * rq,sector_t s,unsigned int a)132 static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
133 {
134 return 0;
135 }
sd_dif_complete(struct scsi_cmnd * cmd,unsigned int a)136 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
137 {
138 }
139
140 #endif /* CONFIG_BLK_DEV_INTEGRITY */
141
142 #endif /* _SCSI_DISK_H */
143