tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_DEF_XFER_BLOCKS = 0xffff,
48 SD_MAX_XFER_BLOCKS = 0xffffffff,
49 SD_MAX_WS10_BLOCKS = 0xffff,
50 SD_MAX_WS16_BLOCKS = 0x7fffff,
51};
52
53enum {
54 SD_LBP_FULL = 0, /* Full logical block provisioning */
55 SD_LBP_UNMAP, /* Use UNMAP command */
56 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
57 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
58 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
59 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
60};
61
62struct scsi_disk {
63 struct scsi_driver *driver; /* always &sd_template */
64 struct scsi_device *device;
65 struct device dev;
66 struct gendisk *disk;
67 atomic_t openers;
68 sector_t capacity; /* size in logical blocks */
69 u32 max_xfer_blocks;
70 u32 opt_xfer_blocks;
71 u32 max_ws_blocks;
72 u32 max_unmap_blocks;
73 u32 unmap_granularity;
74 u32 unmap_alignment;
75 u32 index;
76 unsigned int physical_block_size;
77 unsigned int max_medium_access_timeouts;
78 unsigned int medium_access_timed_out;
79 u8 media_present;
80 u8 write_prot;
81 u8 protection_type;/* Data Integrity Field */
82 u8 provisioning_mode;
83 unsigned ATO : 1; /* state of disk ATO bit */
84 unsigned cache_override : 1; /* temp override of WCE,RCD */
85 unsigned WCE : 1; /* state of disk WCE bit */
86 unsigned RCD : 1; /* state of disk RCD bit, unused */
87 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
88 unsigned first_scan : 1;
89 unsigned lbpme : 1;
90 unsigned lbprz : 1;
91 unsigned lbpu : 1;
92 unsigned lbpws : 1;
93 unsigned lbpws10 : 1;
94 unsigned lbpvpd : 1;
95 unsigned ws10 : 1;
96 unsigned ws16 : 1;
97};
98#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
99
100static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
101{
102 return container_of(disk->private_data, struct scsi_disk, driver);
103}
104
105#define sd_printk(prefix, sdsk, fmt, a...) \
106 (sdsk)->disk ? \
107 sdev_prefix_printk(prefix, (sdsk)->device, \
108 (sdsk)->disk->disk_name, fmt, ##a) : \
109 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
110
111#define sd_first_printk(prefix, sdsk, fmt, a...) \
112 do { \
113 if ((sdkp)->first_scan) \
114 sd_printk(prefix, sdsk, fmt, ##a); \
115 } while (0)
116
117static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
118{
119 switch (scmd->cmnd[0]) {
120 case READ_6:
121 case READ_10:
122 case READ_12:
123 case READ_16:
124 case SYNCHRONIZE_CACHE:
125 case VERIFY:
126 case VERIFY_12:
127 case VERIFY_16:
128 case WRITE_6:
129 case WRITE_10:
130 case WRITE_12:
131 case WRITE_16:
132 case WRITE_SAME:
133 case WRITE_SAME_16:
134 case UNMAP:
135 return 1;
136 case VARIABLE_LENGTH_CMD:
137 switch (scmd->cmnd[9]) {
138 case READ_32:
139 case VERIFY_32:
140 case WRITE_32:
141 case WRITE_SAME_32:
142 return 1;
143 }
144 }
145
146 return 0;
147}
148
149static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
150{
151 return blocks << (ilog2(sdev->sector_size) - 9);
152}
153
154static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
155{
156 return blocks * sdev->sector_size;
157}
158
159/*
160 * Look up the DIX operation based on whether the command is read or
161 * write and whether dix and dif are enabled.
162 */
163static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
164{
165 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
166 const unsigned int ops[] = { /* wrt dix dif */
167 SCSI_PROT_NORMAL, /* 0 0 0 */
168 SCSI_PROT_READ_STRIP, /* 0 0 1 */
169 SCSI_PROT_READ_INSERT, /* 0 1 0 */
170 SCSI_PROT_READ_PASS, /* 0 1 1 */
171 SCSI_PROT_NORMAL, /* 1 0 0 */
172 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
173 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
174 SCSI_PROT_WRITE_PASS, /* 1 1 1 */
175 };
176
177 return ops[write << 2 | dix << 1 | dif];
178}
179
180/*
181 * Returns a mask of the protection flags that are valid for a given DIX
182 * operation.
183 */
184static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
185{
186 const unsigned int flag_mask[] = {
187 [SCSI_PROT_NORMAL] = 0,
188
189 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
190 SCSI_PROT_GUARD_CHECK |
191 SCSI_PROT_REF_CHECK |
192 SCSI_PROT_REF_INCREMENT,
193
194 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
195 SCSI_PROT_IP_CHECKSUM,
196
197 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
198 SCSI_PROT_GUARD_CHECK |
199 SCSI_PROT_REF_CHECK |
200 SCSI_PROT_REF_INCREMENT |
201 SCSI_PROT_IP_CHECKSUM,
202
203 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
204 SCSI_PROT_REF_INCREMENT,
205
206 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
207 SCSI_PROT_REF_CHECK |
208 SCSI_PROT_REF_INCREMENT |
209 SCSI_PROT_IP_CHECKSUM,
210
211 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
212 SCSI_PROT_GUARD_CHECK |
213 SCSI_PROT_REF_CHECK |
214 SCSI_PROT_REF_INCREMENT |
215 SCSI_PROT_IP_CHECKSUM,
216 };
217
218 return flag_mask[prot_op];
219}
220
221#ifdef CONFIG_BLK_DEV_INTEGRITY
222
223extern void sd_dif_config_host(struct scsi_disk *);
224extern void sd_dif_prepare(struct scsi_cmnd *scmd);
225extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
226
227#else /* CONFIG_BLK_DEV_INTEGRITY */
228
229static inline void sd_dif_config_host(struct scsi_disk *disk)
230{
231}
232static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
233{
234 return 0;
235}
236static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
237{
238}
239
240#endif /* CONFIG_BLK_DEV_INTEGRITY */
241
242#endif /* _SCSI_DISK_H */