1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SCSI_SCSI_DEVICE_H 3 #define _SCSI_SCSI_DEVICE_H 4 5 #include <linux/list.h> 6 #include <linux/spinlock.h> 7 #include <linux/workqueue.h> 8 #include <linux/blk-mq.h> 9 #include <scsi/scsi.h> 10 #include <linux/atomic.h> 11 #include <linux/sbitmap.h> 12 13 struct bsg_device; 14 struct device; 15 struct request_queue; 16 struct scsi_cmnd; 17 struct scsi_lun; 18 struct scsi_sense_hdr; 19 20 typedef __u64 __bitwise blist_flags_t; 21 22 #define SCSI_SENSE_BUFFERSIZE 96 23 24 struct scsi_mode_data { 25 __u32 length; 26 __u16 block_descriptor_length; 27 __u8 medium_type; 28 __u8 device_specific; 29 __u8 header_length; 30 __u8 longlba:1; 31 }; 32 33 /* 34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 35 * (for the ascii descriptions) and the state model enforcer: 36 * scsi_lib:scsi_device_set_state(). 37 */ 38 enum scsi_device_state { 39 SDEV_CREATED = 1, /* device created but not added to sysfs 40 * Only internal commands allowed (for inq) */ 41 SDEV_RUNNING, /* device properly configured 42 * All commands allowed */ 43 SDEV_CANCEL, /* beginning to delete device 44 * Only error handler commands allowed */ 45 SDEV_DEL, /* device deleted 46 * no commands allowed */ 47 SDEV_QUIESCE, /* Device quiescent. No block commands 48 * will be accepted, only specials (which 49 * originate in the mid-layer) */ 50 SDEV_OFFLINE, /* Device offlined (by error handling or 51 * user request */ 52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 53 SDEV_BLOCK, /* Device blocked by scsi lld. No 54 * scsi commands from user or midlayer 55 * should be issued to the scsi 56 * lld. */ 57 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 58 }; 59 60 enum scsi_scan_mode { 61 SCSI_SCAN_INITIAL = 0, 62 SCSI_SCAN_RESCAN, 63 SCSI_SCAN_MANUAL, 64 }; 65 66 enum scsi_device_event { 67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 75 76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 78 79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 80 }; 81 82 struct scsi_event { 83 enum scsi_device_event evt_type; 84 struct list_head node; 85 86 /* put union of data structures, for non-simple event types, 87 * here 88 */ 89 }; 90 91 /** 92 * struct scsi_vpd - SCSI Vital Product Data 93 * @rcu: For kfree_rcu(). 94 * @len: Length in bytes of @data. 95 * @data: VPD data as defined in various T10 SCSI standard documents. 96 */ 97 struct scsi_vpd { 98 struct rcu_head rcu; 99 int len; 100 unsigned char data[]; 101 }; 102 103 struct scsi_device { 104 struct Scsi_Host *host; 105 struct request_queue *request_queue; 106 107 /* the next two are protected by the host->host_lock */ 108 struct list_head siblings; /* list of all devices on this host */ 109 struct list_head same_target_siblings; /* just the devices sharing same target id */ 110 111 struct sbitmap budget_map; 112 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 113 114 atomic_t restarts; 115 spinlock_t list_lock; 116 struct list_head starved_entry; 117 unsigned short queue_depth; /* How deep of a queue we want */ 118 unsigned short max_queue_depth; /* max queue depth */ 119 unsigned short last_queue_full_depth; /* These two are used by */ 120 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 121 unsigned long last_queue_full_time; /* last queue full time */ 122 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 123 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 124 125 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 126 127 unsigned int id, channel; 128 u64 lun; 129 unsigned int manufacturer; /* Manufacturer of device, for using 130 * vendor-specific cmd's */ 131 unsigned sector_size; /* size in bytes */ 132 133 void *hostdata; /* available to low-level driver */ 134 unsigned char type; 135 char scsi_level; 136 char inq_periph_qual; /* PQ from INQUIRY data */ 137 struct mutex inquiry_mutex; 138 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 139 unsigned char * inquiry; /* INQUIRY response data */ 140 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 141 const char * model; /* ... after scan; point to static string */ 142 const char * rev; /* ... "nullnullnullnull" before scan */ 143 144 #define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */ 145 struct scsi_vpd __rcu *vpd_pg0; 146 struct scsi_vpd __rcu *vpd_pg83; 147 struct scsi_vpd __rcu *vpd_pg80; 148 struct scsi_vpd __rcu *vpd_pg89; 149 struct scsi_vpd __rcu *vpd_pgb0; 150 struct scsi_vpd __rcu *vpd_pgb1; 151 struct scsi_vpd __rcu *vpd_pgb2; 152 struct scsi_vpd __rcu *vpd_pgb7; 153 154 struct scsi_target *sdev_target; 155 156 blist_flags_t sdev_bflags; /* black/white flags as also found in 157 * scsi_devinfo.[hc]. For now used only to 158 * pass settings from sdev_init to scsi 159 * core. */ 160 unsigned int eh_timeout; /* Error handling timeout */ 161 162 /* 163 * If true, let the high-level device driver (sd) manage the device 164 * power state for system suspend/resume (suspend to RAM and 165 * hibernation) operations. 166 */ 167 unsigned manage_system_start_stop:1; 168 169 /* 170 * If true, let the high-level device driver (sd) manage the device 171 * power state for runtime device suspand and resume operations. 172 */ 173 unsigned manage_runtime_start_stop:1; 174 175 /* 176 * If true, let the high-level device driver (sd) manage the device 177 * power state for system shutdown (power off) operations. 178 */ 179 unsigned manage_shutdown:1; 180 181 /* 182 * If set and if the device is runtime suspended, ask the high-level 183 * device driver (sd) to force a runtime resume of the device. 184 */ 185 unsigned force_runtime_start_on_system_start:1; 186 187 /* 188 * Set if the device is an ATA device. 189 */ 190 unsigned is_ata:1; 191 192 unsigned removable:1; 193 unsigned changed:1; /* Data invalid due to media change */ 194 unsigned busy:1; /* Used to prevent races */ 195 unsigned lockable:1; /* Able to prevent media removal */ 196 unsigned locked:1; /* Media removal disabled */ 197 unsigned borken:1; /* Tell the Seagate driver to be 198 * painfully slow on this device */ 199 unsigned disconnect:1; /* can disconnect */ 200 unsigned soft_reset:1; /* Uses soft reset option */ 201 unsigned sdtr:1; /* Device supports SDTR messages */ 202 unsigned wdtr:1; /* Device supports WDTR messages */ 203 unsigned ppr:1; /* Device supports PPR messages */ 204 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 205 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 206 unsigned was_reset:1; /* There was a bus reset on the bus for 207 * this device */ 208 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 209 * because we did a bus reset. */ 210 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 211 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 212 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 213 unsigned read_before_ms:1; /* perform a READ before MODE SENSE */ 214 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 215 unsigned no_write_same:1; /* no WRITE SAME command */ 216 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 217 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */ 218 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 219 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 220 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 221 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 222 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 223 unsigned no_start_on_add:1; /* do not issue start on add */ 224 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 225 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 226 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 227 unsigned select_no_atn:1; 228 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 229 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 230 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 231 unsigned last_sector_bug:1; /* do not use multisector accesses on 232 SD_LAST_BUGGY_SECTORS */ 233 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 234 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 235 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 236 unsigned security_supported:1; /* Supports Security Protocols */ 237 unsigned is_visible:1; /* is the device visible in sysfs */ 238 unsigned wce_default_on:1; /* Cache is ON by default */ 239 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 240 unsigned broken_fua:1; /* Don't set FUA bit */ 241 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 242 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 243 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 244 * creation time */ 245 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 246 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 247 unsigned no_vpd_size:1; /* No VPD size reported in header */ 248 249 unsigned cdl_supported:1; /* Command duration limits supported */ 250 unsigned cdl_enable:1; /* Enable/disable Command duration limits */ 251 252 unsigned int queue_stopped; /* request queue is quiesced */ 253 bool offline_already; /* Device offline message logged */ 254 255 unsigned int ua_new_media_ctr; /* Counter for New Media UNIT ATTENTIONs */ 256 unsigned int ua_por_ctr; /* Counter for Power On / Reset UAs */ 257 258 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 259 260 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 261 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 262 struct list_head event_list; /* asserted events */ 263 struct work_struct event_work; 264 265 unsigned int max_device_blocked; /* what device_blocked counts down from */ 266 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 267 268 atomic_t iorequest_cnt; 269 atomic_t iodone_cnt; 270 atomic_t ioerr_cnt; 271 atomic_t iotmo_cnt; 272 273 struct device sdev_gendev, 274 sdev_dev; 275 276 struct work_struct requeue_work; 277 278 struct scsi_device_handler *handler; 279 void *handler_data; 280 281 size_t dma_drain_len; 282 void *dma_drain_buf; 283 284 unsigned int sg_timeout; 285 unsigned int sg_reserved_size; 286 287 struct bsg_device *bsg_dev; 288 unsigned char access_state; 289 struct mutex state_mutex; 290 enum scsi_device_state sdev_state; 291 struct task_struct *quiesced_by; 292 unsigned long sdev_data[]; 293 } __attribute__((aligned(sizeof(unsigned long)))); 294 295 #define to_scsi_device(d) \ 296 container_of(d, struct scsi_device, sdev_gendev) 297 #define class_to_sdev(d) \ 298 container_of(d, struct scsi_device, sdev_dev) 299 #define transport_class_to_sdev(class_dev) \ 300 to_scsi_device(class_dev->parent) 301 302 #define sdev_dbg(sdev, fmt, a...) \ 303 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 304 305 /* 306 * like scmd_printk, but the device name is passed in 307 * as a string pointer 308 */ 309 __printf(4, 5) void 310 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 311 const char *, ...); 312 313 #define sdev_printk(l, sdev, fmt, a...) \ 314 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 315 316 __printf(3, 4) void 317 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 318 319 #define scmd_dbg(scmd, fmt, a...) \ 320 do { \ 321 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 322 \ 323 if (__rq->q->disk) \ 324 sdev_dbg((scmd)->device, "[%s] " fmt, \ 325 __rq->q->disk->disk_name, ##a); \ 326 else \ 327 sdev_dbg((scmd)->device, fmt, ##a); \ 328 } while (0) 329 330 enum scsi_target_state { 331 STARGET_CREATED = 1, 332 STARGET_RUNNING, 333 STARGET_REMOVE, 334 STARGET_CREATED_REMOVE, 335 STARGET_DEL, 336 }; 337 338 /* 339 * scsi_target: representation of a scsi target, for now, this is only 340 * used for single_lun devices. If no one has active IO to the target, 341 * starget_sdev_user is NULL, else it points to the active sdev. 342 */ 343 struct scsi_target { 344 struct scsi_device *starget_sdev_user; 345 struct list_head siblings; 346 struct list_head devices; 347 struct device dev; 348 struct kref reap_ref; /* last put renders target invisible */ 349 unsigned int channel; 350 unsigned int id; /* target id ... replace 351 * scsi_device.id eventually */ 352 unsigned int create:1; /* signal that it needs to be added */ 353 unsigned int single_lun:1; /* Indicates we should only 354 * allow I/O to one of the luns 355 * for the device at a time. */ 356 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 357 * means no lun present. */ 358 unsigned int no_report_luns:1; /* Don't use 359 * REPORT LUNS for scanning. */ 360 unsigned int expecting_lun_change:1; /* A device has reported 361 * a 3F/0E UA, other devices on 362 * the same target will also. */ 363 /* commands actually active on LLD. */ 364 atomic_t target_busy; 365 atomic_t target_blocked; 366 367 /* 368 * LLDs should set this in the sdev_init host template callout. 369 * If set to zero then there is not limit. 370 */ 371 unsigned int can_queue; 372 unsigned int max_target_blocked; 373 #define SCSI_DEFAULT_TARGET_BLOCKED 3 374 375 char scsi_level; 376 enum scsi_target_state state; 377 void *hostdata; /* available to low-level driver */ 378 unsigned long starget_data[]; /* for the transport */ 379 /* starget_data must be the last element!!!! */ 380 } __attribute__((aligned(sizeof(unsigned long)))); 381 382 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 383 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 384 { 385 return to_scsi_target(sdev->sdev_gendev.parent); 386 } 387 #define transport_class_to_starget(class_dev) \ 388 to_scsi_target(class_dev->parent) 389 390 #define starget_printk(prefix, starget, fmt, a...) \ 391 dev_printk(prefix, &(starget)->dev, fmt, ##a) 392 393 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 394 uint, uint, u64, void *hostdata); 395 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 396 uint target, u64 lun); 397 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 398 extern void scsi_remove_device(struct scsi_device *); 399 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 400 void scsi_attach_vpd(struct scsi_device *sdev); 401 void scsi_cdl_check(struct scsi_device *sdev); 402 int scsi_cdl_enable(struct scsi_device *sdev, bool enable); 403 404 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 405 extern int __must_check scsi_device_get(struct scsi_device *); 406 extern void scsi_device_put(struct scsi_device *); 407 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 408 uint, uint, u64); 409 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 410 uint, uint, u64); 411 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 412 u64); 413 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 414 u64); 415 extern void starget_for_each_device(struct scsi_target *, void *, 416 void (*fn)(struct scsi_device *, void *)); 417 extern void __starget_for_each_device(struct scsi_target *, void *, 418 void (*fn)(struct scsi_device *, 419 void *)); 420 421 /* only exposed to implement shost_for_each_device */ 422 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 423 struct scsi_device *); 424 425 /** 426 * shost_for_each_device - iterate over all devices of a host 427 * @sdev: the &struct scsi_device to use as a cursor 428 * @shost: the &struct scsi_host to iterate over 429 * 430 * Iterator that returns each device attached to @shost. This loop 431 * takes a reference on each device and releases it at the end. If 432 * you break out of the loop, you must call scsi_device_put(sdev). 433 */ 434 #define shost_for_each_device(sdev, shost) \ 435 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 436 (sdev); \ 437 (sdev) = __scsi_iterate_devices((shost), (sdev))) 438 439 /** 440 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 441 * @sdev: the &struct scsi_device to use as a cursor 442 * @shost: the &struct scsi_host to iterate over 443 * 444 * Iterator that returns each device attached to @shost. It does _not_ 445 * take a reference on the scsi_device, so the whole loop must be 446 * protected by shost->host_lock. 447 * 448 * Note: The only reason to use this is because you need to access the 449 * device list in interrupt context. Otherwise you really want to use 450 * shost_for_each_device instead. 451 */ 452 #define __shost_for_each_device(sdev, shost) \ 453 list_for_each_entry((sdev), &((shost)->__devices), siblings) 454 455 extern int scsi_change_queue_depth(struct scsi_device *, int); 456 extern int scsi_track_queue_full(struct scsi_device *, int); 457 458 extern int scsi_set_medium_removal(struct scsi_device *, char); 459 460 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 461 int subpage, unsigned char *buffer, int len, int timeout, 462 int retries, struct scsi_mode_data *data, 463 struct scsi_sense_hdr *); 464 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 465 unsigned char *buffer, int len, int timeout, 466 int retries, struct scsi_mode_data *data, 467 struct scsi_sense_hdr *); 468 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 469 int retries, struct scsi_sense_hdr *sshdr); 470 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 471 int buf_len); 472 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 473 unsigned int len, unsigned char opcode, 474 unsigned short sa); 475 extern int scsi_device_set_state(struct scsi_device *sdev, 476 enum scsi_device_state state); 477 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 478 gfp_t gfpflags); 479 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 480 extern void sdev_evt_send_simple(struct scsi_device *sdev, 481 enum scsi_device_event evt_type, gfp_t gfpflags); 482 extern int scsi_device_quiesce(struct scsi_device *sdev); 483 extern void scsi_device_resume(struct scsi_device *sdev); 484 extern void scsi_target_quiesce(struct scsi_target *); 485 extern void scsi_target_resume(struct scsi_target *); 486 extern void scsi_scan_target(struct device *parent, unsigned int channel, 487 unsigned int id, u64 lun, 488 enum scsi_scan_mode rescan); 489 extern void scsi_target_reap(struct scsi_target *); 490 void scsi_block_targets(struct Scsi_Host *shost, struct device *dev); 491 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 492 extern void scsi_remove_target(struct device *); 493 extern const char *scsi_device_state_name(enum scsi_device_state); 494 extern int scsi_is_sdev_device(const struct device *); 495 extern int scsi_is_target_device(const struct device *); 496 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 497 498 /* 499 * scsi_execute_cmd users can set scsi_failure.result to have 500 * scsi_check_passthrough fail/retry a command. scsi_failure.result can be a 501 * specific host byte or message code, or SCMD_FAILURE_RESULT_ANY can be used 502 * to match any host or message code. 503 */ 504 #define SCMD_FAILURE_RESULT_ANY 0x7fffffff 505 /* 506 * Set scsi_failure.result to SCMD_FAILURE_STAT_ANY to fail/retry any failure 507 * scsi_status_is_good returns false for. 508 */ 509 #define SCMD_FAILURE_STAT_ANY 0xff 510 /* 511 * The following can be set to the scsi_failure sense, asc and ascq fields to 512 * match on any sense, ASC, or ASCQ value. 513 */ 514 #define SCMD_FAILURE_SENSE_ANY 0xff 515 #define SCMD_FAILURE_ASC_ANY 0xff 516 #define SCMD_FAILURE_ASCQ_ANY 0xff 517 /* Always retry a matching failure. */ 518 #define SCMD_FAILURE_NO_LIMIT -1 519 520 struct scsi_failure { 521 int result; 522 u8 sense; 523 u8 asc; 524 u8 ascq; 525 /* 526 * Number of times scsi_execute_cmd will retry the failure. It does 527 * not count for the total_allowed. 528 */ 529 s8 allowed; 530 /* Number of times the failure has been retried. */ 531 s8 retries; 532 }; 533 534 struct scsi_failures { 535 /* 536 * If a scsi_failure does not have a retry limit setup this limit will 537 * be used. 538 */ 539 int total_allowed; 540 int total_retries; 541 struct scsi_failure *failure_definitions; 542 }; 543 544 /* Optional arguments to scsi_execute_cmd */ 545 struct scsi_exec_args { 546 unsigned char *sense; /* sense buffer */ 547 unsigned int sense_len; /* sense buffer len */ 548 struct scsi_sense_hdr *sshdr; /* decoded sense header */ 549 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ 550 int scmd_flags; /* SCMD flags */ 551 int *resid; /* residual length */ 552 struct scsi_failures *failures; /* failures to retry */ 553 }; 554 555 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, 556 blk_opf_t opf, void *buffer, unsigned int bufflen, 557 int timeout, int retries, 558 const struct scsi_exec_args *args); 559 void scsi_failures_reset_retries(struct scsi_failures *failures); 560 561 extern void sdev_disable_disk_events(struct scsi_device *sdev); 562 extern void sdev_enable_disk_events(struct scsi_device *sdev); 563 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 564 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 565 566 #ifdef CONFIG_PM 567 extern int scsi_autopm_get_device(struct scsi_device *); 568 extern void scsi_autopm_put_device(struct scsi_device *); 569 #else 570 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 571 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 572 #endif /* CONFIG_PM */ 573 574 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 575 { 576 return device_reprobe(&sdev->sdev_gendev); 577 } 578 579 static inline unsigned int sdev_channel(struct scsi_device *sdev) 580 { 581 return sdev->channel; 582 } 583 584 static inline unsigned int sdev_id(struct scsi_device *sdev) 585 { 586 return sdev->id; 587 } 588 589 #define scmd_id(scmd) sdev_id((scmd)->device) 590 #define scmd_channel(scmd) sdev_channel((scmd)->device) 591 592 /* 593 * checks for positions of the SCSI state machine 594 */ 595 static inline int scsi_device_online(struct scsi_device *sdev) 596 { 597 return (sdev->sdev_state != SDEV_OFFLINE && 598 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 599 sdev->sdev_state != SDEV_DEL); 600 } 601 static inline int scsi_device_blocked(struct scsi_device *sdev) 602 { 603 return sdev->sdev_state == SDEV_BLOCK || 604 sdev->sdev_state == SDEV_CREATED_BLOCK; 605 } 606 static inline int scsi_device_created(struct scsi_device *sdev) 607 { 608 return sdev->sdev_state == SDEV_CREATED || 609 sdev->sdev_state == SDEV_CREATED_BLOCK; 610 } 611 612 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 613 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 614 enum scsi_device_state new_state); 615 616 /* accessor functions for the SCSI parameters */ 617 static inline int scsi_device_sync(struct scsi_device *sdev) 618 { 619 return sdev->sdtr; 620 } 621 static inline int scsi_device_wide(struct scsi_device *sdev) 622 { 623 return sdev->wdtr; 624 } 625 static inline int scsi_device_dt(struct scsi_device *sdev) 626 { 627 return sdev->ppr; 628 } 629 static inline int scsi_device_dt_only(struct scsi_device *sdev) 630 { 631 if (sdev->inquiry_len < 57) 632 return 0; 633 return (sdev->inquiry[56] & 0x0c) == 0x04; 634 } 635 static inline int scsi_device_ius(struct scsi_device *sdev) 636 { 637 if (sdev->inquiry_len < 57) 638 return 0; 639 return sdev->inquiry[56] & 0x01; 640 } 641 static inline int scsi_device_qas(struct scsi_device *sdev) 642 { 643 if (sdev->inquiry_len < 57) 644 return 0; 645 return sdev->inquiry[56] & 0x02; 646 } 647 static inline int scsi_device_enclosure(struct scsi_device *sdev) 648 { 649 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 650 } 651 652 static inline int scsi_device_protection(struct scsi_device *sdev) 653 { 654 if (sdev->no_dif) 655 return 0; 656 657 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 658 } 659 660 static inline int scsi_device_tpgs(struct scsi_device *sdev) 661 { 662 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 663 } 664 665 /** 666 * scsi_device_supports_vpd - test if a device supports VPD pages 667 * @sdev: the &struct scsi_device to test 668 * 669 * If the 'try_vpd_pages' flag is set it takes precedence. 670 * Otherwise we will assume VPD pages are supported if the 671 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 672 */ 673 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 674 { 675 /* Attempt VPD inquiry if the device blacklist explicitly calls 676 * for it. 677 */ 678 if (sdev->try_vpd_pages) 679 return 1; 680 /* 681 * Although VPD inquiries can go to SCSI-2 type devices, 682 * some USB ones crash on receiving them, and the pages 683 * we currently ask for are mandatory for SPC-2 and beyond 684 */ 685 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 686 return 1; 687 return 0; 688 } 689 690 static inline int scsi_device_busy(struct scsi_device *sdev) 691 { 692 return sbitmap_weight(&sdev->budget_map); 693 } 694 695 /* Macros to access the UNIT ATTENTION counters */ 696 #define scsi_get_ua_new_media_ctr(sdev) \ 697 ((const unsigned int)(sdev->ua_new_media_ctr)) 698 #define scsi_get_ua_por_ctr(sdev) \ 699 ((const unsigned int)(sdev->ua_por_ctr)) 700 701 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 702 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 703 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 704 705 #endif /* _SCSI_SCSI_DEVICE_H */ 706