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
41 enum {
42 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
43 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
44 };
45
46 enum {
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
53 enum {
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
62 struct 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
scsi_disk(struct gendisk * disk)100 static 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
scsi_medium_access_command(struct scsi_cmnd * scmd)117 static 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
logical_to_sectors(struct scsi_device * sdev,sector_t blocks)149 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
150 {
151 return blocks << (ilog2(sdev->sector_size) - 9);
152 }
153
logical_to_bytes(struct scsi_device * sdev,sector_t blocks)154 static 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 */
sd_prot_op(bool write,bool dix,bool dif)163 static 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 */
sd_prot_flag_mask(unsigned int prot_op)184 static 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
223 extern void sd_dif_config_host(struct scsi_disk *);
224 extern void sd_dif_prepare(struct scsi_cmnd *scmd);
225 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
226
227 #else /* CONFIG_BLK_DEV_INTEGRITY */
228
sd_dif_config_host(struct scsi_disk * disk)229 static inline void sd_dif_config_host(struct scsi_disk *disk)
230 {
231 }
sd_dif_prepare(struct scsi_cmnd * scmd)232 static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
233 {
234 return 0;
235 }
sd_dif_complete(struct scsi_cmnd * cmd,unsigned int a)236 static 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 */
243