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) 99 100 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) 116 117 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 } 148 149 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks) 150 { 151 return blocks << (ilog2(sdev->sector_size) - 9); 152 } 153 154 /* 155 * A DIF-capable target device can be formatted with different 156 * protection schemes. Currently 0 through 3 are defined: 157 * 158 * Type 0 is regular (unprotected) I/O 159 * 160 * Type 1 defines the contents of the guard and reference tags 161 * 162 * Type 2 defines the contents of the guard and reference tags and 163 * uses 32-byte commands to seed the latter 164 * 165 * Type 3 defines the contents of the guard tag only 166 */ 167 168 enum sd_dif_target_protection_types { 169 SD_DIF_TYPE0_PROTECTION = 0x0, 170 SD_DIF_TYPE1_PROTECTION = 0x1, 171 SD_DIF_TYPE2_PROTECTION = 0x2, 172 SD_DIF_TYPE3_PROTECTION = 0x3, 173 }; 174 175 /* 176 * Look up the DIX operation based on whether the command is read or 177 * write and whether dix and dif are enabled. 178 */ 179 static inline unsigned int sd_prot_op(bool write, bool dix, bool dif) 180 { 181 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */ 182 const unsigned int ops[] = { /* wrt dix dif */ 183 SCSI_PROT_NORMAL, /* 0 0 0 */ 184 SCSI_PROT_READ_STRIP, /* 0 0 1 */ 185 SCSI_PROT_READ_INSERT, /* 0 1 0 */ 186 SCSI_PROT_READ_PASS, /* 0 1 1 */ 187 SCSI_PROT_NORMAL, /* 1 0 0 */ 188 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */ 189 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */ 190 SCSI_PROT_WRITE_PASS, /* 1 1 1 */ 191 }; 192 193 return ops[write << 2 | dix << 1 | dif]; 194 } 195 196 /* 197 * Returns a mask of the protection flags that are valid for a given DIX 198 * operation. 199 */ 200 static inline unsigned int sd_prot_flag_mask(unsigned int prot_op) 201 { 202 const unsigned int flag_mask[] = { 203 [SCSI_PROT_NORMAL] = 0, 204 205 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI | 206 SCSI_PROT_GUARD_CHECK | 207 SCSI_PROT_REF_CHECK | 208 SCSI_PROT_REF_INCREMENT, 209 210 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT | 211 SCSI_PROT_IP_CHECKSUM, 212 213 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI | 214 SCSI_PROT_GUARD_CHECK | 215 SCSI_PROT_REF_CHECK | 216 SCSI_PROT_REF_INCREMENT | 217 SCSI_PROT_IP_CHECKSUM, 218 219 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI | 220 SCSI_PROT_REF_INCREMENT, 221 222 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK | 223 SCSI_PROT_REF_CHECK | 224 SCSI_PROT_REF_INCREMENT | 225 SCSI_PROT_IP_CHECKSUM, 226 227 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI | 228 SCSI_PROT_GUARD_CHECK | 229 SCSI_PROT_REF_CHECK | 230 SCSI_PROT_REF_INCREMENT | 231 SCSI_PROT_IP_CHECKSUM, 232 }; 233 234 return flag_mask[prot_op]; 235 } 236 237 /* 238 * Data Integrity Field tuple. 239 */ 240 struct sd_dif_tuple { 241 __be16 guard_tag; /* Checksum */ 242 __be16 app_tag; /* Opaque storage */ 243 __be32 ref_tag; /* Target LBA or indirect LBA */ 244 }; 245 246 #ifdef CONFIG_BLK_DEV_INTEGRITY 247 248 extern void sd_dif_config_host(struct scsi_disk *); 249 extern void sd_dif_prepare(struct scsi_cmnd *scmd); 250 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); 251 252 #else /* CONFIG_BLK_DEV_INTEGRITY */ 253 254 static inline void sd_dif_config_host(struct scsi_disk *disk) 255 { 256 } 257 static inline int sd_dif_prepare(struct scsi_cmnd *scmd) 258 { 259 return 0; 260 } 261 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a) 262 { 263 } 264 265 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 266 267 #endif /* _SCSI_DISK_H */ 268