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