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