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 logical blocks */
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]) {
149 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
151 return blocks << (ilog2(sdev->sector_size) - 9);
154 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
156 return blocks * sdev->sector_size;
160 * Look up the DIX operation based on whether the command is read or
161 * write and whether dix and dif are enabled.
163 static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
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 */
177 return ops[write << 2 | dix << 1 | dif];
181 * Returns a mask of the protection flags that are valid for a given DIX
184 static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
186 const unsigned int flag_mask[] = {
187 [SCSI_PROT_NORMAL] = 0,
189 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
190 SCSI_PROT_GUARD_CHECK |
191 SCSI_PROT_REF_CHECK |
192 SCSI_PROT_REF_INCREMENT,
194 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
195 SCSI_PROT_IP_CHECKSUM,
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,
203 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
204 SCSI_PROT_REF_INCREMENT,
206 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
207 SCSI_PROT_REF_CHECK |
208 SCSI_PROT_REF_INCREMENT |
209 SCSI_PROT_IP_CHECKSUM,
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,
218 return flag_mask[prot_op];
221 #ifdef CONFIG_BLK_DEV_INTEGRITY
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);
227 #else /* CONFIG_BLK_DEV_INTEGRITY */
229 static inline void sd_dif_config_host(struct scsi_disk *disk)
232 static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
236 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
240 #endif /* CONFIG_BLK_DEV_INTEGRITY */
242 #endif /* _SCSI_DISK_H */