1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SCSI_DISK_H 3 #define _SCSI_DISK_H 4 5 /* 6 * More than enough for everybody ;) The huge number of majors 7 * is a leftover from 16bit dev_t days, we don't really need that 8 * much numberspace. 9 */ 10 #define SD_MAJORS 16 11 12 /* 13 * Time out in seconds for disks and Magneto-opticals (which are slower). 14 */ 15 #define SD_TIMEOUT (30 * HZ) 16 #define SD_MOD_TIMEOUT (75 * HZ) 17 /* 18 * Flush timeout is a multiplier over the standard device timeout which is 19 * user modifiable via sysfs but initially set to SD_TIMEOUT 20 */ 21 #define SD_FLUSH_TIMEOUT_MULTIPLIER 2 22 #define SD_WRITE_SAME_TIMEOUT (120 * HZ) 23 24 /* 25 * Number of allowed retries 26 */ 27 #define SD_MAX_RETRIES 5 28 #define SD_PASSTHROUGH_RETRIES 1 29 #define SD_MAX_MEDIUM_TIMEOUTS 2 30 31 /* 32 * Size of the initial data buffer for mode and read capacity data 33 */ 34 #define SD_BUF_SIZE 512 35 36 /* 37 * Number of sectors at the end of the device to avoid multi-sector 38 * accesses to in the case of last_sector_bug 39 */ 40 #define SD_LAST_BUGGY_SECTORS 8 41 42 enum { 43 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */ 44 SD_MEMPOOL_SIZE = 2, /* CDB pool size */ 45 }; 46 47 enum { 48 SD_DEF_XFER_BLOCKS = 0xffff, 49 SD_MAX_XFER_BLOCKS = 0xffffffff, 50 SD_MAX_WS10_BLOCKS = 0xffff, 51 SD_MAX_WS16_BLOCKS = 0x7fffff, 52 }; 53 54 enum { 55 SD_LBP_FULL = 0, /* Full logical block provisioning */ 56 SD_LBP_UNMAP, /* Use UNMAP command */ 57 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */ 58 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */ 59 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */ 60 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */ 61 }; 62 63 enum { 64 SD_ZERO_WRITE = 0, /* Use WRITE(10/16) command */ 65 SD_ZERO_WS, /* Use WRITE SAME(10/16) command */ 66 SD_ZERO_WS16_UNMAP, /* Use WRITE SAME(16) with UNMAP */ 67 SD_ZERO_WS10_UNMAP, /* Use WRITE SAME(10) with UNMAP */ 68 }; 69 70 /** 71 * struct zoned_disk_info - Specific properties of a ZBC SCSI device. 72 * @nr_zones: number of zones. 73 * @zone_blocks: number of logical blocks per zone. 74 * 75 * This data structure holds the ZBC SCSI device properties that are retrieved 76 * twice: a first time before the gendisk capacity is known and a second time 77 * after the gendisk capacity is known. 78 */ 79 struct zoned_disk_info { 80 u32 nr_zones; 81 u32 zone_blocks; 82 }; 83 84 struct scsi_disk { 85 struct scsi_device *device; 86 87 /* 88 * disk_dev is used to show attributes in /sys/class/scsi_disk/, 89 * but otherwise not really needed. Do not use for refcounting. 90 */ 91 struct device disk_dev; 92 struct gendisk *disk; 93 struct opal_dev *opal_dev; 94 #ifdef CONFIG_BLK_DEV_ZONED 95 /* Updated during revalidation before the gendisk capacity is known. */ 96 struct zoned_disk_info early_zone_info; 97 /* Updated during revalidation after the gendisk capacity is known. */ 98 struct zoned_disk_info zone_info; 99 u32 zones_optimal_open; 100 u32 zones_optimal_nonseq; 101 u32 zones_max_open; 102 /* 103 * Either zero or a power of two. If not zero it means that the offset 104 * between zone starting LBAs is constant. 105 */ 106 u32 zone_starting_lba_gran; 107 #endif 108 atomic_t openers; 109 sector_t capacity; /* size in logical blocks */ 110 int max_retries; 111 u32 min_xfer_blocks; 112 u32 max_xfer_blocks; 113 u32 opt_xfer_blocks; 114 u32 max_ws_blocks; 115 u32 max_unmap_blocks; 116 u32 unmap_granularity; 117 u32 unmap_alignment; 118 u32 index; 119 unsigned int physical_block_size; 120 unsigned int max_medium_access_timeouts; 121 unsigned int medium_access_timed_out; 122 /* number of permanent streams */ 123 u16 permanent_stream_count; 124 u8 media_present; 125 u8 write_prot; 126 u8 protection_type;/* Data Integrity Field */ 127 u8 provisioning_mode; 128 u8 zeroing_mode; 129 u8 nr_actuators; /* Number of actuators */ 130 bool suspended; /* Disk is suspended (stopped) */ 131 unsigned ATO : 1; /* state of disk ATO bit */ 132 unsigned cache_override : 1; /* temp override of WCE,RCD */ 133 unsigned WCE : 1; /* state of disk WCE bit */ 134 unsigned RCD : 1; /* state of disk RCD bit, unused */ 135 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ 136 unsigned first_scan : 1; 137 unsigned lbpme : 1; 138 unsigned lbprz : 1; 139 unsigned lbpu : 1; 140 unsigned lbpws : 1; 141 unsigned lbpws10 : 1; 142 unsigned lbpvpd : 1; 143 unsigned ws10 : 1; 144 unsigned ws16 : 1; 145 unsigned rc_basis: 2; 146 unsigned zoned: 2; 147 unsigned urswrz : 1; 148 unsigned security : 1; 149 unsigned ignore_medium_access_errors : 1; 150 unsigned rscs : 1; /* reduced stream control support */ 151 }; 152 #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev) 153 154 static inline struct scsi_disk *scsi_disk(struct gendisk *disk) 155 { 156 return disk->private_data; 157 } 158 159 #define sd_printk(prefix, sdsk, fmt, a...) \ 160 (sdsk)->disk ? \ 161 sdev_prefix_printk(prefix, (sdsk)->device, \ 162 (sdsk)->disk->disk_name, fmt, ##a) : \ 163 sdev_printk(prefix, (sdsk)->device, fmt, ##a) 164 165 #define sd_first_printk(prefix, sdsk, fmt, a...) \ 166 do { \ 167 if ((sdsk)->first_scan) \ 168 sd_printk(prefix, sdsk, fmt, ##a); \ 169 } while (0) 170 171 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd) 172 { 173 switch (scmd->cmnd[0]) { 174 case READ_6: 175 case READ_10: 176 case READ_12: 177 case READ_16: 178 case SYNCHRONIZE_CACHE: 179 case VERIFY: 180 case VERIFY_12: 181 case VERIFY_16: 182 case WRITE_6: 183 case WRITE_10: 184 case WRITE_12: 185 case WRITE_16: 186 case WRITE_SAME: 187 case WRITE_SAME_16: 188 case UNMAP: 189 return 1; 190 case VARIABLE_LENGTH_CMD: 191 switch (scmd->cmnd[9]) { 192 case READ_32: 193 case VERIFY_32: 194 case WRITE_32: 195 case WRITE_SAME_32: 196 return 1; 197 } 198 } 199 200 return 0; 201 } 202 203 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks) 204 { 205 return blocks << (ilog2(sdev->sector_size) - 9); 206 } 207 208 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks) 209 { 210 return blocks * sdev->sector_size; 211 } 212 213 static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes) 214 { 215 return bytes >> ilog2(sdev->sector_size); 216 } 217 218 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector) 219 { 220 return sector >> (ilog2(sdev->sector_size) - 9); 221 } 222 223 void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim); 224 225 static inline int sd_is_zoned(struct scsi_disk *sdkp) 226 { 227 return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC; 228 } 229 230 #ifdef CONFIG_BLK_DEV_ZONED 231 232 int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim, 233 u8 buf[SD_BUF_SIZE]); 234 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp); 235 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd, 236 unsigned char op, bool all); 237 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes, 238 struct scsi_sense_hdr *sshdr); 239 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector, 240 unsigned int nr_zones, report_zones_cb cb, void *data); 241 242 #else /* CONFIG_BLK_DEV_ZONED */ 243 244 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, 245 struct queue_limits *lim, u8 buf[SD_BUF_SIZE]) 246 { 247 return 0; 248 } 249 250 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp) 251 { 252 return 0; 253 } 254 255 static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd, 256 unsigned char op, 257 bool all) 258 { 259 return BLK_STS_TARGET; 260 } 261 262 static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, 263 unsigned int good_bytes, struct scsi_sense_hdr *sshdr) 264 { 265 return good_bytes; 266 } 267 268 #define sd_zbc_report_zones NULL 269 270 #endif /* CONFIG_BLK_DEV_ZONED */ 271 272 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr); 273 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result); 274 275 #endif /* _SCSI_DISK_H */ 276