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
12 * Time out in seconds for disks and Magneto-opticals (which are slower).
14 #define SD_TIMEOUT (30 * HZ)
15 #define SD_MOD_TIMEOUT (75 * HZ)
17 * Flush timeout is a multiplier over the standard device timeout which is
18 * user modifiable via sysfs but initially set to SD_TIMEOUT
20 #define SD_FLUSH_TIMEOUT_MULTIPLIER 2
21 #define SD_WRITE_SAME_TIMEOUT (120 * HZ)
24 * Number of allowed retries
26 #define SD_MAX_RETRIES 5
27 #define SD_PASSTHROUGH_RETRIES 1
28 #define SD_MAX_MEDIUM_TIMEOUTS 2
31 * Size of the initial data buffer for mode and read capacity data
33 #define SD_BUF_SIZE 512
36 * Number of sectors at the end of the device to avoid multi-sector
37 * accesses to in the case of last_sector_bug
39 #define SD_LAST_BUGGY_SECTORS 8
42 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
43 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
47 SD_DEF_XFER_BLOCKS = 0xffff,
48 SD_MAX_XFER_BLOCKS = 0xffffffff,
49 SD_MAX_WS10_BLOCKS = 0xffff,
50 SD_MAX_WS16_BLOCKS = 0x7fffff,
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 */
63 struct scsi_driver *driver; /* always &sd_template */
64 struct scsi_device *device;
68 sector_t capacity; /* size in 512-byte sectors */
73 u32 unmap_granularity;
76 unsigned int physical_block_size;
77 unsigned int max_medium_access_timeouts;
78 unsigned int medium_access_timed_out;
81 u8 protection_type;/* Data Integrity Field */
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;
98 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
100 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
102 return container_of(disk->private_data, struct scsi_disk, driver);
105 #define sd_printk(prefix, sdsk, fmt, a...) \
107 sdev_prefix_printk(prefix, (sdsk)->device, \
108 (sdsk)->disk->disk_name, fmt, ##a) : \
109 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
111 #define sd_first_printk(prefix, sdsk, fmt, a...) \
113 if ((sdkp)->first_scan) \
114 sd_printk(prefix, sdsk, fmt, ##a); \
117 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
119 switch (scmd->cmnd[0]) {
124 case SYNCHRONIZE_CACHE:
136 case VARIABLE_LENGTH_CMD:
137 switch (scmd->cmnd[9]) {
150 * A DIF-capable target device can be formatted with different
151 * protection schemes. Currently 0 through 3 are defined:
153 * Type 0 is regular (unprotected) I/O
155 * Type 1 defines the contents of the guard and reference tags
157 * Type 2 defines the contents of the guard and reference tags and
158 * uses 32-byte commands to seed the latter
160 * Type 3 defines the contents of the guard tag only
163 enum sd_dif_target_protection_types {
164 SD_DIF_TYPE0_PROTECTION = 0x0,
165 SD_DIF_TYPE1_PROTECTION = 0x1,
166 SD_DIF_TYPE2_PROTECTION = 0x2,
167 SD_DIF_TYPE3_PROTECTION = 0x3,
171 * Look up the DIX operation based on whether the command is read or
172 * write and whether dix and dif are enabled.
174 static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
176 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
177 const unsigned int ops[] = { /* wrt dix dif */
178 SCSI_PROT_NORMAL, /* 0 0 0 */
179 SCSI_PROT_READ_STRIP, /* 0 0 1 */
180 SCSI_PROT_READ_INSERT, /* 0 1 0 */
181 SCSI_PROT_READ_PASS, /* 0 1 1 */
182 SCSI_PROT_NORMAL, /* 1 0 0 */
183 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
184 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
185 SCSI_PROT_WRITE_PASS, /* 1 1 1 */
188 return ops[write << 2 | dix << 1 | dif];
192 * Returns a mask of the protection flags that are valid for a given DIX
195 static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
197 const unsigned int flag_mask[] = {
198 [SCSI_PROT_NORMAL] = 0,
200 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
201 SCSI_PROT_GUARD_CHECK |
202 SCSI_PROT_REF_CHECK |
203 SCSI_PROT_REF_INCREMENT,
205 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
206 SCSI_PROT_IP_CHECKSUM,
208 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
209 SCSI_PROT_GUARD_CHECK |
210 SCSI_PROT_REF_CHECK |
211 SCSI_PROT_REF_INCREMENT |
212 SCSI_PROT_IP_CHECKSUM,
214 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
215 SCSI_PROT_REF_INCREMENT,
217 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
218 SCSI_PROT_REF_CHECK |
219 SCSI_PROT_REF_INCREMENT |
220 SCSI_PROT_IP_CHECKSUM,
222 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
223 SCSI_PROT_GUARD_CHECK |
224 SCSI_PROT_REF_CHECK |
225 SCSI_PROT_REF_INCREMENT |
226 SCSI_PROT_IP_CHECKSUM,
229 return flag_mask[prot_op];
233 * Data Integrity Field tuple.
235 struct sd_dif_tuple {
236 __be16 guard_tag; /* Checksum */
237 __be16 app_tag; /* Opaque storage */
238 __be32 ref_tag; /* Target LBA or indirect LBA */
241 #ifdef CONFIG_BLK_DEV_INTEGRITY
243 extern void sd_dif_config_host(struct scsi_disk *);
244 extern void sd_dif_prepare(struct scsi_cmnd *scmd);
245 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
247 #else /* CONFIG_BLK_DEV_INTEGRITY */
249 static inline void sd_dif_config_host(struct scsi_disk *disk)
252 static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
256 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
260 #endif /* CONFIG_BLK_DEV_INTEGRITY */
262 #endif /* _SCSI_DISK_H */