tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
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/*
17 * Flush timeout is a multiplier over the standard device timeout which is
18 * user modifiable via sysfs but initially set to SD_TIMEOUT
19 */
20#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
21#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
22
23/*
24 * Number of allowed retries
25 */
26#define SD_MAX_RETRIES 5
27#define SD_PASSTHROUGH_RETRIES 1
28#define SD_MAX_MEDIUM_TIMEOUTS 2
29
30/*
31 * Size of the initial data buffer for mode and read capacity data
32 */
33#define SD_BUF_SIZE 512
34
35/*
36 * Number of sectors at the end of the device to avoid multi-sector
37 * accesses to in the case of last_sector_bug
38 */
39#define SD_LAST_BUGGY_SECTORS 8
40
41enum {
42 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
43 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
44};
45
46enum {
47 SD_MAX_WS10_BLOCKS = 0xffff,
48 SD_MAX_WS16_BLOCKS = 0x7fffff,
49};
50
51enum {
52 SD_LBP_FULL = 0, /* Full logical block provisioning */
53 SD_LBP_UNMAP, /* Use UNMAP command */
54 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
55 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
56 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
57 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
58};
59
60struct scsi_disk {
61 struct scsi_driver *driver; /* always &sd_template */
62 struct scsi_device *device;
63 struct device dev;
64 struct gendisk *disk;
65 atomic_t openers;
66 sector_t capacity; /* size in 512-byte sectors */
67 u32 max_ws_blocks;
68 u32 max_unmap_blocks;
69 u32 unmap_granularity;
70 u32 unmap_alignment;
71 u32 index;
72 unsigned int physical_block_size;
73 unsigned int max_medium_access_timeouts;
74 unsigned int medium_access_timed_out;
75 u8 media_present;
76 u8 write_prot;
77 u8 protection_type;/* Data Integrity Field */
78 u8 provisioning_mode;
79 unsigned ATO : 1; /* state of disk ATO bit */
80 unsigned cache_override : 1; /* temp override of WCE,RCD */
81 unsigned WCE : 1; /* state of disk WCE bit */
82 unsigned RCD : 1; /* state of disk RCD bit, unused */
83 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
84 unsigned first_scan : 1;
85 unsigned lbpme : 1;
86 unsigned lbprz : 1;
87 unsigned lbpu : 1;
88 unsigned lbpws : 1;
89 unsigned lbpws10 : 1;
90 unsigned lbpvpd : 1;
91 unsigned ws10 : 1;
92 unsigned ws16 : 1;
93};
94#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
95
96static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
97{
98 return container_of(disk->private_data, struct scsi_disk, driver);
99}
100
101#define sd_printk(prefix, sdsk, fmt, a...) \
102 (sdsk)->disk ? \
103 sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
104 (sdsk)->disk->disk_name, ##a) : \
105 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
106
107#define sd_first_printk(prefix, sdsk, fmt, a...) \
108 do { \
109 if ((sdkp)->first_scan) \
110 sd_printk(prefix, sdsk, fmt, ##a); \
111 } while (0)
112
113static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
114{
115 switch (scmd->cmnd[0]) {
116 case READ_6:
117 case READ_10:
118 case READ_12:
119 case READ_16:
120 case SYNCHRONIZE_CACHE:
121 case VERIFY:
122 case VERIFY_12:
123 case VERIFY_16:
124 case WRITE_6:
125 case WRITE_10:
126 case WRITE_12:
127 case WRITE_16:
128 case WRITE_SAME:
129 case WRITE_SAME_16:
130 case UNMAP:
131 return 1;
132 case VARIABLE_LENGTH_CMD:
133 switch (scmd->cmnd[9]) {
134 case READ_32:
135 case VERIFY_32:
136 case WRITE_32:
137 case WRITE_SAME_32:
138 return 1;
139 }
140 }
141
142 return 0;
143}
144
145/*
146 * A DIF-capable target device can be formatted with different
147 * protection schemes. Currently 0 through 3 are defined:
148 *
149 * Type 0 is regular (unprotected) I/O
150 *
151 * Type 1 defines the contents of the guard and reference tags
152 *
153 * Type 2 defines the contents of the guard and reference tags and
154 * uses 32-byte commands to seed the latter
155 *
156 * Type 3 defines the contents of the guard tag only
157 */
158
159enum sd_dif_target_protection_types {
160 SD_DIF_TYPE0_PROTECTION = 0x0,
161 SD_DIF_TYPE1_PROTECTION = 0x1,
162 SD_DIF_TYPE2_PROTECTION = 0x2,
163 SD_DIF_TYPE3_PROTECTION = 0x3,
164};
165
166/*
167 * Data Integrity Field tuple.
168 */
169struct sd_dif_tuple {
170 __be16 guard_tag; /* Checksum */
171 __be16 app_tag; /* Opaque storage */
172 __be32 ref_tag; /* Target LBA or indirect LBA */
173};
174
175#ifdef CONFIG_BLK_DEV_INTEGRITY
176
177extern void sd_dif_config_host(struct scsi_disk *);
178extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
179extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
180
181#else /* CONFIG_BLK_DEV_INTEGRITY */
182
183static inline void sd_dif_config_host(struct scsi_disk *disk)
184{
185}
186static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
187{
188 return 0;
189}
190static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
191{
192}
193
194#endif /* CONFIG_BLK_DEV_INTEGRITY */
195
196#endif /* _SCSI_DISK_H */