xref: /openbmc/linux/drivers/scsi/sd.h (revision e8e0929d)
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  * 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 
34 /*
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 
40 struct scsi_disk {
41 	struct scsi_driver *driver;	/* always &sd_template */
42 	struct scsi_device *device;
43 	struct device	dev;
44 	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 	unsigned short	hw_sector_size;
49 	u8		media_present;
50 	u8		write_prot;
51 	u8		protection_type;/* Data Integrity Field */
52 	unsigned	previous_state : 1;
53 	unsigned	ATO : 1;	/* state of disk ATO bit */
54 	unsigned	WCE : 1;	/* state of disk WCE bit */
55 	unsigned	RCD : 1;	/* state of disk RCD bit, unused */
56 	unsigned	DPOFUA : 1;	/* state of disk DPOFUA bit */
57 	unsigned	first_scan : 1;
58 };
59 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
60 
61 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
62 {
63 	return container_of(disk->private_data, struct scsi_disk, driver);
64 }
65 
66 #define sd_printk(prefix, sdsk, fmt, a...)				\
67         (sdsk)->disk ?							\
68 	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
69 		    (sdsk)->disk->disk_name, ##a) :			\
70 	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
71 
72 /*
73  * A DIF-capable target device can be formatted with different
74  * protection schemes.  Currently 0 through 3 are defined:
75  *
76  * Type 0 is regular (unprotected) I/O
77  *
78  * Type 1 defines the contents of the guard and reference tags
79  *
80  * Type 2 defines the contents of the guard and reference tags and
81  * uses 32-byte commands to seed the latter
82  *
83  * Type 3 defines the contents of the guard tag only
84  */
85 
86 enum sd_dif_target_protection_types {
87 	SD_DIF_TYPE0_PROTECTION = 0x0,
88 	SD_DIF_TYPE1_PROTECTION = 0x1,
89 	SD_DIF_TYPE2_PROTECTION = 0x2,
90 	SD_DIF_TYPE3_PROTECTION = 0x3,
91 };
92 
93 /*
94  * Data Integrity Field tuple.
95  */
96 struct sd_dif_tuple {
97        __be16 guard_tag;	/* Checksum */
98        __be16 app_tag;		/* Opaque storage */
99        __be32 ref_tag;		/* Target LBA or indirect LBA */
100 };
101 
102 #ifdef CONFIG_BLK_DEV_INTEGRITY
103 
104 extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int);
105 extern void sd_dif_config_host(struct scsi_disk *);
106 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
107 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
108 
109 #else /* CONFIG_BLK_DEV_INTEGRITY */
110 
111 static inline void sd_dif_op(struct scsi_cmnd *cmd, unsigned int a, unsigned int b, unsigned int c)
112 {
113 }
114 static inline void sd_dif_config_host(struct scsi_disk *disk)
115 {
116 }
117 static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
118 {
119 	return 0;
120 }
121 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
122 {
123 }
124 
125 #endif /* CONFIG_BLK_DEV_INTEGRITY */
126 
127 #endif /* _SCSI_DISK_H */
128