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