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 max_ws_blocks; 71 u32 max_unmap_blocks; 72 u32 unmap_granularity; 73 u32 unmap_alignment; 74 u32 index; 75 unsigned int physical_block_size; 76 unsigned int max_medium_access_timeouts; 77 unsigned int medium_access_timed_out; 78 u8 media_present; 79 u8 write_prot; 80 u8 protection_type;/* Data Integrity Field */ 81 u8 provisioning_mode; 82 unsigned ATO : 1; /* state of disk ATO bit */ 83 unsigned cache_override : 1; /* temp override of WCE,RCD */ 84 unsigned WCE : 1; /* state of disk WCE bit */ 85 unsigned RCD : 1; /* state of disk RCD bit, unused */ 86 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ 87 unsigned first_scan : 1; 88 unsigned lbpme : 1; 89 unsigned lbprz : 1; 90 unsigned lbpu : 1; 91 unsigned lbpws : 1; 92 unsigned lbpws10 : 1; 93 unsigned lbpvpd : 1; 94 unsigned ws10 : 1; 95 unsigned ws16 : 1; 96}; 97#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev) 98 99static inline struct scsi_disk *scsi_disk(struct gendisk *disk) 100{ 101 return container_of(disk->private_data, struct scsi_disk, driver); 102} 103 104#define sd_printk(prefix, sdsk, fmt, a...) \ 105 (sdsk)->disk ? \ 106 sdev_prefix_printk(prefix, (sdsk)->device, \ 107 (sdsk)->disk->disk_name, fmt, ##a) : \ 108 sdev_printk(prefix, (sdsk)->device, fmt, ##a) 109 110#define sd_first_printk(prefix, sdsk, fmt, a...) \ 111 do { \ 112 if ((sdkp)->first_scan) \ 113 sd_printk(prefix, sdsk, fmt, ##a); \ 114 } while (0) 115 116static inline int scsi_medium_access_command(struct scsi_cmnd *scmd) 117{ 118 switch (scmd->cmnd[0]) { 119 case READ_6: 120 case READ_10: 121 case READ_12: 122 case READ_16: 123 case SYNCHRONIZE_CACHE: 124 case VERIFY: 125 case VERIFY_12: 126 case VERIFY_16: 127 case WRITE_6: 128 case WRITE_10: 129 case WRITE_12: 130 case WRITE_16: 131 case WRITE_SAME: 132 case WRITE_SAME_16: 133 case UNMAP: 134 return 1; 135 case VARIABLE_LENGTH_CMD: 136 switch (scmd->cmnd[9]) { 137 case READ_32: 138 case VERIFY_32: 139 case WRITE_32: 140 case WRITE_SAME_32: 141 return 1; 142 } 143 } 144 145 return 0; 146} 147 148static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks) 149{ 150 return blocks << (ilog2(sdev->sector_size) - 9); 151} 152 153/* 154 * A DIF-capable target device can be formatted with different 155 * protection schemes. Currently 0 through 3 are defined: 156 * 157 * Type 0 is regular (unprotected) I/O 158 * 159 * Type 1 defines the contents of the guard and reference tags 160 * 161 * Type 2 defines the contents of the guard and reference tags and 162 * uses 32-byte commands to seed the latter 163 * 164 * Type 3 defines the contents of the guard tag only 165 */ 166 167enum sd_dif_target_protection_types { 168 SD_DIF_TYPE0_PROTECTION = 0x0, 169 SD_DIF_TYPE1_PROTECTION = 0x1, 170 SD_DIF_TYPE2_PROTECTION = 0x2, 171 SD_DIF_TYPE3_PROTECTION = 0x3, 172}; 173 174/* 175 * Look up the DIX operation based on whether the command is read or 176 * write and whether dix and dif are enabled. 177 */ 178static inline unsigned int sd_prot_op(bool write, bool dix, bool dif) 179{ 180 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */ 181 const unsigned int ops[] = { /* wrt dix dif */ 182 SCSI_PROT_NORMAL, /* 0 0 0 */ 183 SCSI_PROT_READ_STRIP, /* 0 0 1 */ 184 SCSI_PROT_READ_INSERT, /* 0 1 0 */ 185 SCSI_PROT_READ_PASS, /* 0 1 1 */ 186 SCSI_PROT_NORMAL, /* 1 0 0 */ 187 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */ 188 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */ 189 SCSI_PROT_WRITE_PASS, /* 1 1 1 */ 190 }; 191 192 return ops[write << 2 | dix << 1 | dif]; 193} 194 195/* 196 * Returns a mask of the protection flags that are valid for a given DIX 197 * operation. 198 */ 199static inline unsigned int sd_prot_flag_mask(unsigned int prot_op) 200{ 201 const unsigned int flag_mask[] = { 202 [SCSI_PROT_NORMAL] = 0, 203 204 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI | 205 SCSI_PROT_GUARD_CHECK | 206 SCSI_PROT_REF_CHECK | 207 SCSI_PROT_REF_INCREMENT, 208 209 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT | 210 SCSI_PROT_IP_CHECKSUM, 211 212 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI | 213 SCSI_PROT_GUARD_CHECK | 214 SCSI_PROT_REF_CHECK | 215 SCSI_PROT_REF_INCREMENT | 216 SCSI_PROT_IP_CHECKSUM, 217 218 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI | 219 SCSI_PROT_REF_INCREMENT, 220 221 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK | 222 SCSI_PROT_REF_CHECK | 223 SCSI_PROT_REF_INCREMENT | 224 SCSI_PROT_IP_CHECKSUM, 225 226 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI | 227 SCSI_PROT_GUARD_CHECK | 228 SCSI_PROT_REF_CHECK | 229 SCSI_PROT_REF_INCREMENT | 230 SCSI_PROT_IP_CHECKSUM, 231 }; 232 233 return flag_mask[prot_op]; 234} 235 236/* 237 * Data Integrity Field tuple. 238 */ 239struct sd_dif_tuple { 240 __be16 guard_tag; /* Checksum */ 241 __be16 app_tag; /* Opaque storage */ 242 __be32 ref_tag; /* Target LBA or indirect LBA */ 243}; 244 245#ifdef CONFIG_BLK_DEV_INTEGRITY 246 247extern void sd_dif_config_host(struct scsi_disk *); 248extern void sd_dif_prepare(struct scsi_cmnd *scmd); 249extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); 250 251#else /* CONFIG_BLK_DEV_INTEGRITY */ 252 253static inline void sd_dif_config_host(struct scsi_disk *disk) 254{ 255} 256static inline int sd_dif_prepare(struct scsi_cmnd *scmd) 257{ 258 return 0; 259} 260static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a) 261{ 262} 263 264#endif /* CONFIG_BLK_DEV_INTEGRITY */ 265 266#endif /* _SCSI_DISK_H */ 267