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scsi_device.h
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linux-6.19.14/include/scsi/scsi_device.h
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 13struct bsg_device; 14struct device; 15struct request_queue; 16struct scsi_cmnd; 17struct scsi_lun; 18struct scsi_sense_hdr; 19 20typedef __u64 __bitwise blist_flags_t; 21 22#define SCSI_SENSE_BUFFERSIZE 96 23 24struct 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 */ 38enum 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 60enum scsi_scan_mode { 61 SCSI_SCAN_INITIAL = 0, 62 SCSI_SCAN_RESCAN, 63 SCSI_SCAN_MANUAL, 64}; 65 66enum 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 82struct 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 */ 97struct scsi_vpd { 98 struct rcu_head rcu; 99 int len; 100 unsigned char data[]; 101}; 102 103struct 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 true, let the high-level device driver (sd) manage the device 183 * power state for system restart (reboot) operations. 184 */ 185 unsigned manage_restart:1; 186 187 /* 188 * If set and if the device is runtime suspended, ask the high-level 189 * device driver (sd) to force a runtime resume of the device. 190 */ 191 unsigned force_runtime_start_on_system_start:1; 192 193 /* 194 * Set if the device is an ATA device. 195 */ 196 unsigned is_ata:1; 197 198 unsigned removable:1; 199 unsigned changed:1; /* Data invalid due to media change */ 200 unsigned busy:1; /* Used to prevent races */ 201 unsigned lockable:1; /* Able to prevent media removal */ 202 unsigned locked:1; /* Media removal disabled */ 203 unsigned borken:1; /* Tell the Seagate driver to be 204 * painfully slow on this device */ 205 unsigned disconnect:1; /* can disconnect */ 206 unsigned soft_reset:1; /* Uses soft reset option */ 207 unsigned sdtr:1; /* Device supports SDTR messages */ 208 unsigned wdtr:1; /* Device supports WDTR messages */ 209 unsigned ppr:1; /* Device supports PPR messages */ 210 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 211 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 212 unsigned was_reset:1; /* There was a bus reset on the bus for 213 * this device */ 214 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 215 * because we did a bus reset. */ 216 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 217 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 218 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 219 unsigned read_before_ms:1; /* perform a READ before MODE SENSE */ 220 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 221 unsigned no_write_same:1; /* no WRITE SAME command */ 222 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 223 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */ 224 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 225 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 226 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 227 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 228 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 229 unsigned no_start_on_add:1; /* do not issue start on add */ 230 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 231 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 232 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 233 unsigned select_no_atn:1; 234 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 235 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 236 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 237 unsigned last_sector_bug:1; /* do not use multisector accesses on 238 SD_LAST_BUGGY_SECTORS */ 239 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 240 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 241 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 242 unsigned security_supported:1; /* Supports Security Protocols */ 243 unsigned is_visible:1; /* is the device visible in sysfs */ 244 unsigned wce_default_on:1; /* Cache is ON by default */ 245 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 246 unsigned broken_fua:1; /* Don't set FUA bit */ 247 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 248 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 249 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 250 * creation time */ 251 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 252 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 253 unsigned no_vpd_size:1; /* No VPD size reported in header */ 254 255 unsigned cdl_supported:1; /* Command duration limits supported */ 256 unsigned cdl_enable:1; /* Enable/disable Command duration limits */ 257 258 unsigned int queue_stopped; /* request queue is quiesced */ 259 bool offline_already; /* Device offline message logged */ 260 261 atomic_t ua_new_media_ctr; /* Counter for New Media UNIT ATTENTIONs */ 262 atomic_t ua_por_ctr; /* Counter for Power On / Reset UAs */ 263 264 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 265 266 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 267 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 268 struct list_head event_list; /* asserted events */ 269 struct work_struct event_work; 270 271 unsigned int max_device_blocked; /* what device_blocked counts down from */ 272#define SCSI_DEFAULT_DEVICE_BLOCKED 3 273 274 atomic_t iorequest_cnt; 275 atomic_t iodone_cnt; 276 atomic_t ioerr_cnt; 277 atomic_t iotmo_cnt; 278 279 struct device sdev_gendev, 280 sdev_dev; 281 282 struct work_struct requeue_work; 283 284 struct scsi_device_handler *handler; 285 void *handler_data; 286 287 size_t dma_drain_len; 288 void *dma_drain_buf; 289 290 unsigned int sg_timeout; 291 unsigned int sg_reserved_size; 292 293 struct bsg_device *bsg_dev; 294 unsigned char access_state; 295 struct mutex state_mutex; 296 enum scsi_device_state sdev_state; 297 struct task_struct *quiesced_by; 298 unsigned long sdev_data[]; 299} __attribute__((aligned(sizeof(unsigned long)))); 300 301#define to_scsi_device(d) \ 302 container_of(d, struct scsi_device, sdev_gendev) 303#define class_to_sdev(d) \ 304 container_of(d, struct scsi_device, sdev_dev) 305#define transport_class_to_sdev(class_dev) \ 306 to_scsi_device(class_dev->parent) 307 308#define sdev_dbg(sdev, fmt, a...) \ 309 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 310 311/* 312 * like scmd_printk, but the device name is passed in 313 * as a string pointer 314 */ 315__printf(4, 5) void 316sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 317 const char *, ...); 318 319#define sdev_printk(l, sdev, fmt, a...) \ 320 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 321 322__printf(3, 4) void scmd_printk(const char *, struct scsi_cmnd *, const char *, 323 ...); 324 325#define scmd_dbg(scmd, fmt, a...) \ 326 do { \ 327 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 328 \ 329 if (__rq->q->disk) \ 330 sdev_dbg((scmd)->device, "[%s] " fmt, \ 331 __rq->q->disk->disk_name, ##a); \ 332 else \ 333 sdev_dbg((scmd)->device, fmt, ##a); \ 334 } while (0) 335 336enum scsi_target_state { 337 STARGET_CREATED = 1, 338 STARGET_RUNNING, 339 STARGET_REMOVE, 340 STARGET_CREATED_REMOVE, 341 STARGET_DEL, 342}; 343 344/* 345 * scsi_target: representation of a scsi target, for now, this is only 346 * used for single_lun devices. If no one has active IO to the target, 347 * starget_sdev_user is NULL, else it points to the active sdev. 348 */ 349struct scsi_target { 350 struct scsi_device *starget_sdev_user; 351 struct list_head siblings; 352 struct list_head devices; 353 struct device dev; 354 struct kref reap_ref; /* last put renders target invisible */ 355 unsigned int channel; 356 unsigned int id; /* target id ... replace 357 * scsi_device.id eventually */ 358 unsigned int create:1; /* signal that it needs to be added */ 359 unsigned int single_lun:1; /* Indicates we should only 360 * allow I/O to one of the luns 361 * for the device at a time. */ 362 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 363 * means no lun present. */ 364 unsigned int no_report_luns:1; /* Don't use 365 * REPORT LUNS for scanning. */ 366 unsigned int expecting_lun_change:1; /* A device has reported 367 * a 3F/0E UA, other devices on 368 * the same target will also. */ 369 /* commands actually active on LLD. */ 370 atomic_t target_busy; 371 atomic_t target_blocked; 372 373 /* 374 * LLDs should set this in the sdev_init host template callout. 375 * If set to zero then there is not limit. 376 */ 377 unsigned int can_queue; 378 unsigned int max_target_blocked; 379#define SCSI_DEFAULT_TARGET_BLOCKED 3 380 381 char scsi_level; 382 enum scsi_target_state state; 383 void *hostdata; /* available to low-level driver */ 384 unsigned long starget_data[]; /* for the transport */ 385 /* starget_data must be the last element!!!! */ 386} __attribute__((aligned(sizeof(unsigned long)))); 387 388#define to_scsi_target(d) container_of(d, struct scsi_target, dev) 389static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 390{ 391 return to_scsi_target(sdev->sdev_gendev.parent); 392} 393#define transport_class_to_starget(class_dev) \ 394 to_scsi_target(class_dev->parent) 395 396#define starget_printk(prefix, starget, fmt, a...) \ 397 dev_printk(prefix, &(starget)->dev, fmt, ##a) 398 399extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 400 uint, uint, u64, void *hostdata); 401extern int scsi_add_device(struct Scsi_Host *host, uint channel, 402 uint target, u64 lun); 403extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 404extern void scsi_remove_device(struct scsi_device *); 405extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 406void scsi_attach_vpd(struct scsi_device *sdev); 407void scsi_cdl_check(struct scsi_device *sdev); 408int scsi_cdl_enable(struct scsi_device *sdev, bool enable); 409 410extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 411extern int __must_check scsi_device_get(struct scsi_device *); 412extern void scsi_device_put(struct scsi_device *); 413extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 414 uint, uint, u64); 415extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 416 uint, uint, u64); 417extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 418 u64); 419extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 420 u64); 421extern void starget_for_each_device(struct scsi_target *, void *, 422 void (*fn)(struct scsi_device *, void *)); 423extern void __starget_for_each_device(struct scsi_target *, void *, 424 void (*fn)(struct scsi_device *, 425 void *)); 426 427/* only exposed to implement shost_for_each_device */ 428extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 429 struct scsi_device *); 430 431/** 432 * shost_for_each_device - iterate over all devices of a host 433 * @sdev: the &struct scsi_device to use as a cursor 434 * @shost: the &struct scsi_host to iterate over 435 * 436 * Iterator that returns each device attached to @shost. This loop 437 * takes a reference on each device and releases it at the end. If 438 * you break out of the loop, you must call scsi_device_put(sdev). 439 */ 440#define shost_for_each_device(sdev, shost) \ 441 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 442 (sdev); \ 443 (sdev) = __scsi_iterate_devices((shost), (sdev))) 444 445/** 446 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 447 * @sdev: the &struct scsi_device to use as a cursor 448 * @shost: the &struct scsi_host to iterate over 449 * 450 * Iterator that returns each device attached to @shost. It does _not_ 451 * take a reference on the scsi_device, so the whole loop must be 452 * protected by shost->host_lock. 453 * 454 * Note: The only reason to use this is because you need to access the 455 * device list in interrupt context. Otherwise you really want to use 456 * shost_for_each_device instead. 457 */ 458#define __shost_for_each_device(sdev, shost) \ 459 list_for_each_entry((sdev), &((shost)->__devices), siblings) 460 461extern int scsi_change_queue_depth(struct scsi_device *, int); 462extern int scsi_track_queue_full(struct scsi_device *, int); 463 464extern int scsi_set_medium_removal(struct scsi_device *, char); 465 466int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 467 int subpage, unsigned char *buffer, int len, int timeout, 468 int retries, struct scsi_mode_data *data, 469 struct scsi_sense_hdr *); 470extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 471 unsigned char *buffer, int len, int timeout, 472 int retries, struct scsi_mode_data *data, 473 struct scsi_sense_hdr *); 474extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 475 int retries, struct scsi_sense_hdr *sshdr); 476extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 477 int buf_len); 478int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 479 unsigned int len, unsigned char opcode, 480 unsigned short sa); 481extern int scsi_device_set_state(struct scsi_device *sdev, 482 enum scsi_device_state state); 483extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 484 gfp_t gfpflags); 485extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 486extern void sdev_evt_send_simple(struct scsi_device *sdev, 487 enum scsi_device_event evt_type, gfp_t gfpflags); 488extern int scsi_device_quiesce(struct scsi_device *sdev); 489extern void scsi_device_resume(struct scsi_device *sdev); 490extern void scsi_target_quiesce(struct scsi_target *); 491extern void scsi_target_resume(struct scsi_target *); 492extern void scsi_scan_target(struct device *parent, unsigned int channel, 493 unsigned int id, u64 lun, 494 enum scsi_scan_mode rescan); 495extern void scsi_target_reap(struct scsi_target *); 496void scsi_block_targets(struct Scsi_Host *shost, struct device *dev); 497extern void scsi_target_unblock(struct device *, enum scsi_device_state); 498extern void scsi_remove_target(struct device *); 499extern const char *scsi_device_state_name(enum scsi_device_state); 500extern int scsi_is_sdev_device(const struct device *); 501extern int scsi_is_target_device(const struct device *); 502extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 503 504/* 505 * scsi_execute_cmd users can set scsi_failure.result to have 506 * scsi_check_passthrough fail/retry a command. scsi_failure.result can be a 507 * specific host byte or message code, or SCMD_FAILURE_RESULT_ANY can be used 508 * to match any host or message code. 509 */ 510#define SCMD_FAILURE_RESULT_ANY 0x7fffffff 511/* 512 * Set scsi_failure.result to SCMD_FAILURE_STAT_ANY to fail/retry any failure 513 * scsi_status_is_good returns false for. 514 */ 515#define SCMD_FAILURE_STAT_ANY 0xff 516/* 517 * The following can be set to the scsi_failure sense, asc and ascq fields to 518 * match on any sense, ASC, or ASCQ value. 519 */ 520#define SCMD_FAILURE_SENSE_ANY 0xff 521#define SCMD_FAILURE_ASC_ANY 0xff 522#define SCMD_FAILURE_ASCQ_ANY 0xff 523/* Always retry a matching failure. */ 524#define SCMD_FAILURE_NO_LIMIT -1 525 526struct scsi_failure { 527 int result; 528 u8 sense; 529 u8 asc; 530 u8 ascq; 531 /* 532 * Number of times scsi_execute_cmd will retry the failure. It does 533 * not count for the total_allowed. 534 */ 535 s8 allowed; 536 /* Number of times the failure has been retried. */ 537 s8 retries; 538}; 539 540struct scsi_failures { 541 /* 542 * If a scsi_failure does not have a retry limit setup this limit will 543 * be used. 544 */ 545 int total_allowed; 546 int total_retries; 547 struct scsi_failure *failure_definitions; 548}; 549 550/* Optional arguments to scsi_execute_cmd */ 551struct scsi_exec_args { 552 unsigned char *sense; /* sense buffer */ 553 unsigned int sense_len; /* sense buffer len */ 554 struct scsi_sense_hdr *sshdr; /* decoded sense header */ 555 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ 556 int scmd_flags; /* SCMD flags */ 557 int *resid; /* residual length */ 558 struct scsi_failures *failures; /* failures to retry */ 559}; 560 561int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, 562 blk_opf_t opf, void *buffer, unsigned int bufflen, 563 int timeout, int retries, 564 const struct scsi_exec_args *args); 565void scsi_failures_reset_retries(struct scsi_failures *failures); 566 567struct scsi_cmnd *scsi_get_internal_cmd(struct scsi_device *sdev, 568 enum dma_data_direction data_direction, 569 blk_mq_req_flags_t flags); 570void scsi_put_internal_cmd(struct scsi_cmnd *scmd); 571extern void sdev_disable_disk_events(struct scsi_device *sdev); 572extern void sdev_enable_disk_events(struct scsi_device *sdev); 573extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 574extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 575 576#ifdef CONFIG_PM 577extern int scsi_autopm_get_device(struct scsi_device *); 578extern void scsi_autopm_put_device(struct scsi_device *); 579#else 580static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 581static inline void scsi_autopm_put_device(struct scsi_device *d) {} 582#endif /* CONFIG_PM */ 583 584static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 585{ 586 return device_reprobe(&sdev->sdev_gendev); 587} 588 589static inline unsigned int sdev_channel(struct scsi_device *sdev) 590{ 591 return sdev->channel; 592} 593 594static inline unsigned int sdev_id(struct scsi_device *sdev) 595{ 596 return sdev->id; 597} 598 599#define scmd_id(scmd) sdev_id((scmd)->device) 600#define scmd_channel(scmd) sdev_channel((scmd)->device) 601 602/** 603 * scsi_device_is_pseudo_dev() - Whether a device is a pseudo SCSI device. 604 * @sdev: SCSI device to examine 605 * 606 * A pseudo SCSI device can be used to allocate SCSI commands but does not show 607 * up in sysfs. Additionally, the logical unit information in *@sdev is made up. 608 * 609 * This function tests the LUN number instead of comparing @sdev with 610 * @sdev->host->pseudo_sdev because this function may be called before 611 * @sdev->host->pseudo_sdev has been initialized. 612 */ 613static inline bool scsi_device_is_pseudo_dev(struct scsi_device *sdev) 614{ 615 return sdev->lun == U64_MAX; 616} 617 618/* 619 * checks for positions of the SCSI state machine 620 */ 621static inline int scsi_device_online(struct scsi_device *sdev) 622{ 623 return (sdev->sdev_state != SDEV_OFFLINE && 624 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 625 sdev->sdev_state != SDEV_DEL); 626} 627static inline int scsi_device_blocked(struct scsi_device *sdev) 628{ 629 return sdev->sdev_state == SDEV_BLOCK || 630 sdev->sdev_state == SDEV_CREATED_BLOCK; 631} 632static inline int scsi_device_created(struct scsi_device *sdev) 633{ 634 return sdev->sdev_state == SDEV_CREATED || 635 sdev->sdev_state == SDEV_CREATED_BLOCK; 636} 637 638int scsi_internal_device_block_nowait(struct scsi_device *sdev); 639int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 640 enum scsi_device_state new_state); 641 642/* accessor functions for the SCSI parameters */ 643static inline int scsi_device_sync(struct scsi_device *sdev) 644{ 645 return sdev->sdtr; 646} 647static inline int scsi_device_wide(struct scsi_device *sdev) 648{ 649 return sdev->wdtr; 650} 651static inline int scsi_device_dt(struct scsi_device *sdev) 652{ 653 return sdev->ppr; 654} 655static inline int scsi_device_dt_only(struct scsi_device *sdev) 656{ 657 if (sdev->inquiry_len < 57) 658 return 0; 659 return (sdev->inquiry[56] & 0x0c) == 0x04; 660} 661static inline int scsi_device_ius(struct scsi_device *sdev) 662{ 663 if (sdev->inquiry_len < 57) 664 return 0; 665 return sdev->inquiry[56] & 0x01; 666} 667static inline int scsi_device_qas(struct scsi_device *sdev) 668{ 669 if (sdev->inquiry_len < 57) 670 return 0; 671 return sdev->inquiry[56] & 0x02; 672} 673static inline int scsi_device_enclosure(struct scsi_device *sdev) 674{ 675 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 676} 677 678static inline int scsi_device_protection(struct scsi_device *sdev) 679{ 680 if (sdev->no_dif) 681 return 0; 682 683 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 684} 685 686static inline int scsi_device_tpgs(struct scsi_device *sdev) 687{ 688 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 689} 690 691/** 692 * scsi_device_supports_vpd - test if a device supports VPD pages 693 * @sdev: the &struct scsi_device to test 694 * 695 * If the 'try_vpd_pages' flag is set it takes precedence. 696 * Otherwise we will assume VPD pages are supported if the 697 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 698 */ 699static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 700{ 701 /* Attempt VPD inquiry if the device blacklist explicitly calls 702 * for it. 703 */ 704 if (sdev->try_vpd_pages) 705 return 1; 706 /* 707 * Although VPD inquiries can go to SCSI-2 type devices, 708 * some USB ones crash on receiving them, and the pages 709 * we currently ask for are mandatory for SPC-2 and beyond 710 */ 711 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 712 return 1; 713 return 0; 714} 715 716static inline int scsi_device_busy(struct scsi_device *sdev) 717{ 718 return sbitmap_weight(&sdev->budget_map); 719} 720 721/* Macros to access the UNIT ATTENTION counters */ 722#define scsi_get_ua_new_media_ctr(sdev) atomic_read(&sdev->ua_new_media_ctr) 723#define scsi_get_ua_por_ctr(sdev) atomic_read(&sdev->ua_por_ctr) 724 725#define MODULE_ALIAS_SCSI_DEVICE(type) \ 726 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 727#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 728 729#endif /* _SCSI_SCSI_DEVICE_H */
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