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Martin K. Petersene73aec82007-02-27 22:40:55 -05001#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 * This is limited by the naming scheme enforced in sd_probe,
13 * add another character to it if you really need more disks.
14 */
15#define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26)
16
17/*
18 * Time out in seconds for disks and Magneto-opticals (which are slower).
19 */
20#define SD_TIMEOUT (30 * HZ)
21#define SD_MOD_TIMEOUT (75 * HZ)
22
23/*
24 * Number of allowed retries
25 */
26#define SD_MAX_RETRIES 5
27#define SD_PASSTHROUGH_RETRIES 1
28
29/*
30 * Size of the initial data buffer for mode and read capacity data
31 */
32#define SD_BUF_SIZE 512
33
Linus Torvalds18351072008-08-05 21:42:21 -070034/*
35 * Number of sectors at the end of the device to avoid multi-sector
36 * accesses to in the case of last_sector_bug
37 */
38#define SD_LAST_BUGGY_SECTORS 8
39
Martin K. Petersene73aec82007-02-27 22:40:55 -050040struct scsi_disk {
41 struct scsi_driver *driver; /* always &sd_template */
42 struct scsi_device *device;
Tony Jonesee959b02008-02-22 00:13:36 +010043 struct device dev;
Martin K. Petersene73aec82007-02-27 22:40:55 -050044 struct gendisk *disk;
45 unsigned int openers; /* protected by BKL for now, yuck */
46 sector_t capacity; /* size in 512-byte sectors */
47 u32 index;
48 u8 media_present;
49 u8 write_prot;
Martin K. Petersene0597d72008-07-17 04:28:34 -040050 u8 protection_type;/* Data Integrity Field */
Kay Sievers285e9672007-08-14 14:10:39 +020051 unsigned previous_state : 1;
Martin K. Petersene0597d72008-07-17 04:28:34 -040052 unsigned ATO : 1; /* state of disk ATO bit */
Martin K. Petersene73aec82007-02-27 22:40:55 -050053 unsigned WCE : 1; /* state of disk WCE bit */
54 unsigned RCD : 1; /* state of disk RCD bit, unused */
55 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
56};
Tony Jonesee959b02008-02-22 00:13:36 +010057#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
Martin K. Petersene73aec82007-02-27 22:40:55 -050058
Martin K. Petersen5b635da2008-06-25 11:22:41 -040059static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
60{
61 return container_of(disk->private_data, struct scsi_disk, driver);
62}
63
Martin K. Petersene73aec82007-02-27 22:40:55 -050064#define sd_printk(prefix, sdsk, fmt, a...) \
65 (sdsk)->disk ? \
66 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
67 (sdsk)->disk->disk_name, ##a) : \
68 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
69
Martin K. Petersene0597d72008-07-17 04:28:34 -040070/*
71 * A DIF-capable target device can be formatted with different
72 * protection schemes. Currently 0 through 3 are defined:
73 *
74 * Type 0 is regular (unprotected) I/O
75 *
76 * Type 1 defines the contents of the guard and reference tags
77 *
78 * Type 2 defines the contents of the guard and reference tags and
79 * uses 32-byte commands to seed the latter
80 *
81 * Type 3 defines the contents of the guard tag only
82 */
83
84enum sd_dif_target_protection_types {
85 SD_DIF_TYPE0_PROTECTION = 0x0,
86 SD_DIF_TYPE1_PROTECTION = 0x1,
87 SD_DIF_TYPE2_PROTECTION = 0x2,
88 SD_DIF_TYPE3_PROTECTION = 0x3,
89};
90
Martin K. Petersenaf55ff62008-07-17 04:28:35 -040091/*
92 * Data Integrity Field tuple.
93 */
94struct sd_dif_tuple {
95 __be16 guard_tag; /* Checksum */
96 __be16 app_tag; /* Opaque storage */
97 __be32 ref_tag; /* Target LBA or indirect LBA */
98};
99
James Bottomley4c393e62008-10-13 15:20:06 -0400100#ifdef CONFIG_BLK_DEV_INTEGRITY
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400101
Martin K. Petersen9e066882008-09-19 18:47:21 -0400102extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400103extern void sd_dif_config_host(struct scsi_disk *);
104extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
105extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
106
107#else /* CONFIG_BLK_DEV_INTEGRITY */
108
James Bottomley4c393e62008-10-13 15:20:06 -0400109static inline void sd_dif_op(struct scsi_cmnd *cmd, unsigned int a, unsigned int b, unsigned int c)
110{
111}
112static inline void sd_dif_config_host(struct scsi_disk *disk)
113{
114}
115static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
116{
117 return 0;
118}
119static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
120{
121}
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400122
123#endif /* CONFIG_BLK_DEV_INTEGRITY */
124
Martin K. Petersene73aec82007-02-27 22:40:55 -0500125#endif /* _SCSI_DISK_H */