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 enum scsi_vpd_parameters { 104 SCSI_VPD_HEADER_SIZE = 4, 105 }; 106 107 struct scsi_device { 108 struct Scsi_Host *host; 109 struct request_queue *request_queue; 110 111 /* the next two are protected by the host->host_lock */ 112 struct list_head siblings; /* list of all devices on this host */ 113 struct list_head same_target_siblings; /* just the devices sharing same target id */ 114 115 struct sbitmap budget_map; 116 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 117 118 atomic_t restarts; 119 spinlock_t list_lock; 120 struct list_head starved_entry; 121 unsigned short queue_depth; /* How deep of a queue we want */ 122 unsigned short max_queue_depth; /* max queue depth */ 123 unsigned short last_queue_full_depth; /* These two are used by */ 124 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 125 unsigned long last_queue_full_time; /* last queue full time */ 126 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 127 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 128 129 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 130 131 unsigned int id, channel; 132 u64 lun; 133 unsigned int manufacturer; /* Manufacturer of device, for using 134 * vendor-specific cmd's */ 135 unsigned sector_size; /* size in bytes */ 136 137 void *hostdata; /* available to low-level driver */ 138 unsigned char type; 139 char scsi_level; 140 char inq_periph_qual; /* PQ from INQUIRY data */ 141 struct mutex inquiry_mutex; 142 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 143 unsigned char * inquiry; /* INQUIRY response data */ 144 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 145 const char * model; /* ... after scan; point to static string */ 146 const char * rev; /* ... "nullnullnullnull" before scan */ 147 148 #define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */ 149 struct scsi_vpd __rcu *vpd_pg0; 150 struct scsi_vpd __rcu *vpd_pg83; 151 struct scsi_vpd __rcu *vpd_pg80; 152 struct scsi_vpd __rcu *vpd_pg89; 153 struct scsi_vpd __rcu *vpd_pgb0; 154 struct scsi_vpd __rcu *vpd_pgb1; 155 struct scsi_vpd __rcu *vpd_pgb2; 156 157 struct scsi_target *sdev_target; 158 159 blist_flags_t sdev_bflags; /* black/white flags as also found in 160 * scsi_devinfo.[hc]. For now used only to 161 * pass settings from slave_alloc to scsi 162 * core. */ 163 unsigned int eh_timeout; /* Error handling timeout */ 164 unsigned removable:1; 165 unsigned changed:1; /* Data invalid due to media change */ 166 unsigned busy:1; /* Used to prevent races */ 167 unsigned lockable:1; /* Able to prevent media removal */ 168 unsigned locked:1; /* Media removal disabled */ 169 unsigned borken:1; /* Tell the Seagate driver to be 170 * painfully slow on this device */ 171 unsigned disconnect:1; /* can disconnect */ 172 unsigned soft_reset:1; /* Uses soft reset option */ 173 unsigned sdtr:1; /* Device supports SDTR messages */ 174 unsigned wdtr:1; /* Device supports WDTR messages */ 175 unsigned ppr:1; /* Device supports PPR messages */ 176 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 177 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 178 unsigned was_reset:1; /* There was a bus reset on the bus for 179 * this device */ 180 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 181 * because we did a bus reset. */ 182 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 183 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 184 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 185 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 186 unsigned no_write_same:1; /* no WRITE SAME command */ 187 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 188 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */ 189 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 190 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 191 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 192 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 193 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 194 unsigned no_start_on_add:1; /* do not issue start on add */ 195 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 196 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 197 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 198 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 199 unsigned select_no_atn:1; 200 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 201 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 202 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 203 unsigned last_sector_bug:1; /* do not use multisector accesses on 204 SD_LAST_BUGGY_SECTORS */ 205 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 206 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 207 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 208 unsigned security_supported:1; /* Supports Security Protocols */ 209 unsigned is_visible:1; /* is the device visible in sysfs */ 210 unsigned wce_default_on:1; /* Cache is ON by default */ 211 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 212 unsigned broken_fua:1; /* Don't set FUA bit */ 213 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 214 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 215 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 216 * creation time */ 217 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 218 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 219 unsigned no_vpd_size:1; /* No VPD size reported in header */ 220 221 unsigned int queue_stopped; /* request queue is quiesced */ 222 bool offline_already; /* Device offline message logged */ 223 224 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 225 226 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 227 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 228 struct list_head event_list; /* asserted events */ 229 struct work_struct event_work; 230 231 unsigned int max_device_blocked; /* what device_blocked counts down from */ 232 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 233 234 atomic_t iorequest_cnt; 235 atomic_t iodone_cnt; 236 atomic_t ioerr_cnt; 237 atomic_t iotmo_cnt; 238 239 struct device sdev_gendev, 240 sdev_dev; 241 242 struct work_struct requeue_work; 243 244 struct scsi_device_handler *handler; 245 void *handler_data; 246 247 size_t dma_drain_len; 248 void *dma_drain_buf; 249 250 unsigned int sg_timeout; 251 unsigned int sg_reserved_size; 252 253 struct bsg_device *bsg_dev; 254 unsigned char access_state; 255 struct mutex state_mutex; 256 enum scsi_device_state sdev_state; 257 struct task_struct *quiesced_by; 258 unsigned long sdev_data[]; 259 } __attribute__((aligned(sizeof(unsigned long)))); 260 261 #define to_scsi_device(d) \ 262 container_of(d, struct scsi_device, sdev_gendev) 263 #define class_to_sdev(d) \ 264 container_of(d, struct scsi_device, sdev_dev) 265 #define transport_class_to_sdev(class_dev) \ 266 to_scsi_device(class_dev->parent) 267 268 #define sdev_dbg(sdev, fmt, a...) \ 269 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 270 271 /* 272 * like scmd_printk, but the device name is passed in 273 * as a string pointer 274 */ 275 __printf(4, 5) void 276 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 277 const char *, ...); 278 279 #define sdev_printk(l, sdev, fmt, a...) \ 280 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 281 282 __printf(3, 4) void 283 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 284 285 #define scmd_dbg(scmd, fmt, a...) \ 286 do { \ 287 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 288 \ 289 if (__rq->q->disk) \ 290 sdev_dbg((scmd)->device, "[%s] " fmt, \ 291 __rq->q->disk->disk_name, ##a); \ 292 else \ 293 sdev_dbg((scmd)->device, fmt, ##a); \ 294 } while (0) 295 296 enum scsi_target_state { 297 STARGET_CREATED = 1, 298 STARGET_RUNNING, 299 STARGET_REMOVE, 300 STARGET_CREATED_REMOVE, 301 STARGET_DEL, 302 }; 303 304 /* 305 * scsi_target: representation of a scsi target, for now, this is only 306 * used for single_lun devices. If no one has active IO to the target, 307 * starget_sdev_user is NULL, else it points to the active sdev. 308 */ 309 struct scsi_target { 310 struct scsi_device *starget_sdev_user; 311 struct list_head siblings; 312 struct list_head devices; 313 struct device dev; 314 struct kref reap_ref; /* last put renders target invisible */ 315 unsigned int channel; 316 unsigned int id; /* target id ... replace 317 * scsi_device.id eventually */ 318 unsigned int create:1; /* signal that it needs to be added */ 319 unsigned int single_lun:1; /* Indicates we should only 320 * allow I/O to one of the luns 321 * for the device at a time. */ 322 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 323 * means no lun present. */ 324 unsigned int no_report_luns:1; /* Don't use 325 * REPORT LUNS for scanning. */ 326 unsigned int expecting_lun_change:1; /* A device has reported 327 * a 3F/0E UA, other devices on 328 * the same target will also. */ 329 /* commands actually active on LLD. */ 330 atomic_t target_busy; 331 atomic_t target_blocked; 332 333 /* 334 * LLDs should set this in the slave_alloc host template callout. 335 * If set to zero then there is not limit. 336 */ 337 unsigned int can_queue; 338 unsigned int max_target_blocked; 339 #define SCSI_DEFAULT_TARGET_BLOCKED 3 340 341 char scsi_level; 342 enum scsi_target_state state; 343 void *hostdata; /* available to low-level driver */ 344 unsigned long starget_data[]; /* for the transport */ 345 /* starget_data must be the last element!!!! */ 346 } __attribute__((aligned(sizeof(unsigned long)))); 347 348 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 349 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 350 { 351 return to_scsi_target(sdev->sdev_gendev.parent); 352 } 353 #define transport_class_to_starget(class_dev) \ 354 to_scsi_target(class_dev->parent) 355 356 #define starget_printk(prefix, starget, fmt, a...) \ 357 dev_printk(prefix, &(starget)->dev, fmt, ##a) 358 359 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 360 uint, uint, u64, void *hostdata); 361 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 362 uint target, u64 lun); 363 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 364 extern void scsi_remove_device(struct scsi_device *); 365 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 366 void scsi_attach_vpd(struct scsi_device *sdev); 367 368 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 369 extern int __must_check scsi_device_get(struct scsi_device *); 370 extern void scsi_device_put(struct scsi_device *); 371 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 372 uint, uint, u64); 373 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 374 uint, uint, u64); 375 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 376 u64); 377 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 378 u64); 379 extern void starget_for_each_device(struct scsi_target *, void *, 380 void (*fn)(struct scsi_device *, void *)); 381 extern void __starget_for_each_device(struct scsi_target *, void *, 382 void (*fn)(struct scsi_device *, 383 void *)); 384 385 /* only exposed to implement shost_for_each_device */ 386 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 387 struct scsi_device *); 388 389 /** 390 * shost_for_each_device - iterate over all devices of a host 391 * @sdev: the &struct scsi_device to use as a cursor 392 * @shost: the &struct scsi_host to iterate over 393 * 394 * Iterator that returns each device attached to @shost. This loop 395 * takes a reference on each device and releases it at the end. If 396 * you break out of the loop, you must call scsi_device_put(sdev). 397 */ 398 #define shost_for_each_device(sdev, shost) \ 399 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 400 (sdev); \ 401 (sdev) = __scsi_iterate_devices((shost), (sdev))) 402 403 /** 404 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 405 * @sdev: the &struct scsi_device to use as a cursor 406 * @shost: the &struct scsi_host to iterate over 407 * 408 * Iterator that returns each device attached to @shost. It does _not_ 409 * take a reference on the scsi_device, so the whole loop must be 410 * protected by shost->host_lock. 411 * 412 * Note: The only reason to use this is because you need to access the 413 * device list in interrupt context. Otherwise you really want to use 414 * shost_for_each_device instead. 415 */ 416 #define __shost_for_each_device(sdev, shost) \ 417 list_for_each_entry((sdev), &((shost)->__devices), siblings) 418 419 extern int scsi_change_queue_depth(struct scsi_device *, int); 420 extern int scsi_track_queue_full(struct scsi_device *, int); 421 422 extern int scsi_set_medium_removal(struct scsi_device *, char); 423 424 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 425 int subpage, unsigned char *buffer, int len, int timeout, 426 int retries, struct scsi_mode_data *data, 427 struct scsi_sense_hdr *); 428 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 429 unsigned char *buffer, int len, int timeout, 430 int retries, struct scsi_mode_data *data, 431 struct scsi_sense_hdr *); 432 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 433 int retries, struct scsi_sense_hdr *sshdr); 434 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 435 int buf_len); 436 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 437 unsigned int len, unsigned char opcode, 438 unsigned short sa); 439 extern int scsi_device_set_state(struct scsi_device *sdev, 440 enum scsi_device_state state); 441 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 442 gfp_t gfpflags); 443 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 444 extern void sdev_evt_send_simple(struct scsi_device *sdev, 445 enum scsi_device_event evt_type, gfp_t gfpflags); 446 extern int scsi_device_quiesce(struct scsi_device *sdev); 447 extern void scsi_device_resume(struct scsi_device *sdev); 448 extern void scsi_target_quiesce(struct scsi_target *); 449 extern void scsi_target_resume(struct scsi_target *); 450 extern void scsi_scan_target(struct device *parent, unsigned int channel, 451 unsigned int id, u64 lun, 452 enum scsi_scan_mode rescan); 453 extern void scsi_target_reap(struct scsi_target *); 454 extern void scsi_target_block(struct device *); 455 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 456 extern void scsi_remove_target(struct device *); 457 extern const char *scsi_device_state_name(enum scsi_device_state); 458 extern int scsi_is_sdev_device(const struct device *); 459 extern int scsi_is_target_device(const struct device *); 460 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 461 462 /* Optional arguments to scsi_execute_cmd */ 463 struct scsi_exec_args { 464 unsigned char *sense; /* sense buffer */ 465 unsigned int sense_len; /* sense buffer len */ 466 struct scsi_sense_hdr *sshdr; /* decoded sense header */ 467 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ 468 int scmd_flags; /* SCMD flags */ 469 int *resid; /* residual length */ 470 }; 471 472 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, 473 blk_opf_t opf, void *buffer, unsigned int bufflen, 474 int timeout, int retries, 475 const struct scsi_exec_args *args); 476 477 extern void sdev_disable_disk_events(struct scsi_device *sdev); 478 extern void sdev_enable_disk_events(struct scsi_device *sdev); 479 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 480 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 481 482 #ifdef CONFIG_PM 483 extern int scsi_autopm_get_device(struct scsi_device *); 484 extern void scsi_autopm_put_device(struct scsi_device *); 485 #else 486 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 487 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 488 #endif /* CONFIG_PM */ 489 490 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 491 { 492 return device_reprobe(&sdev->sdev_gendev); 493 } 494 495 static inline unsigned int sdev_channel(struct scsi_device *sdev) 496 { 497 return sdev->channel; 498 } 499 500 static inline unsigned int sdev_id(struct scsi_device *sdev) 501 { 502 return sdev->id; 503 } 504 505 #define scmd_id(scmd) sdev_id((scmd)->device) 506 #define scmd_channel(scmd) sdev_channel((scmd)->device) 507 508 /* 509 * checks for positions of the SCSI state machine 510 */ 511 static inline int scsi_device_online(struct scsi_device *sdev) 512 { 513 return (sdev->sdev_state != SDEV_OFFLINE && 514 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 515 sdev->sdev_state != SDEV_DEL); 516 } 517 static inline int scsi_device_blocked(struct scsi_device *sdev) 518 { 519 return sdev->sdev_state == SDEV_BLOCK || 520 sdev->sdev_state == SDEV_CREATED_BLOCK; 521 } 522 static inline int scsi_device_created(struct scsi_device *sdev) 523 { 524 return sdev->sdev_state == SDEV_CREATED || 525 sdev->sdev_state == SDEV_CREATED_BLOCK; 526 } 527 528 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 529 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 530 enum scsi_device_state new_state); 531 532 /* accessor functions for the SCSI parameters */ 533 static inline int scsi_device_sync(struct scsi_device *sdev) 534 { 535 return sdev->sdtr; 536 } 537 static inline int scsi_device_wide(struct scsi_device *sdev) 538 { 539 return sdev->wdtr; 540 } 541 static inline int scsi_device_dt(struct scsi_device *sdev) 542 { 543 return sdev->ppr; 544 } 545 static inline int scsi_device_dt_only(struct scsi_device *sdev) 546 { 547 if (sdev->inquiry_len < 57) 548 return 0; 549 return (sdev->inquiry[56] & 0x0c) == 0x04; 550 } 551 static inline int scsi_device_ius(struct scsi_device *sdev) 552 { 553 if (sdev->inquiry_len < 57) 554 return 0; 555 return sdev->inquiry[56] & 0x01; 556 } 557 static inline int scsi_device_qas(struct scsi_device *sdev) 558 { 559 if (sdev->inquiry_len < 57) 560 return 0; 561 return sdev->inquiry[56] & 0x02; 562 } 563 static inline int scsi_device_enclosure(struct scsi_device *sdev) 564 { 565 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 566 } 567 568 static inline int scsi_device_protection(struct scsi_device *sdev) 569 { 570 if (sdev->no_dif) 571 return 0; 572 573 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 574 } 575 576 static inline int scsi_device_tpgs(struct scsi_device *sdev) 577 { 578 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 579 } 580 581 /** 582 * scsi_device_supports_vpd - test if a device supports VPD pages 583 * @sdev: the &struct scsi_device to test 584 * 585 * If the 'try_vpd_pages' flag is set it takes precedence. 586 * Otherwise we will assume VPD pages are supported if the 587 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 588 */ 589 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 590 { 591 /* Attempt VPD inquiry if the device blacklist explicitly calls 592 * for it. 593 */ 594 if (sdev->try_vpd_pages) 595 return 1; 596 /* 597 * Although VPD inquiries can go to SCSI-2 type devices, 598 * some USB ones crash on receiving them, and the pages 599 * we currently ask for are mandatory for SPC-2 and beyond 600 */ 601 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 602 return 1; 603 return 0; 604 } 605 606 static inline int scsi_device_busy(struct scsi_device *sdev) 607 { 608 return sbitmap_weight(&sdev->budget_map); 609 } 610 611 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 612 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 613 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 614 615 #endif /* _SCSI_SCSI_DEVICE_H */ 616