1 #ifndef _SCSI_SCSI_DEVICE_H 2 #define _SCSI_SCSI_DEVICE_H 3 4 #include <linux/list.h> 5 #include <linux/spinlock.h> 6 #include <linux/workqueue.h> 7 #include <linux/blkdev.h> 8 #include <scsi/scsi.h> 9 #include <linux/atomic.h> 10 11 struct device; 12 struct request_queue; 13 struct scsi_cmnd; 14 struct scsi_lun; 15 struct scsi_sense_hdr; 16 17 struct scsi_mode_data { 18 __u32 length; 19 __u16 block_descriptor_length; 20 __u8 medium_type; 21 __u8 device_specific; 22 __u8 header_length; 23 __u8 longlba:1; 24 }; 25 26 /* 27 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 28 * (for the ascii descriptions) and the state model enforcer: 29 * scsi_lib:scsi_device_set_state(). 30 */ 31 enum scsi_device_state { 32 SDEV_CREATED = 1, /* device created but not added to sysfs 33 * Only internal commands allowed (for inq) */ 34 SDEV_RUNNING, /* device properly configured 35 * All commands allowed */ 36 SDEV_CANCEL, /* beginning to delete device 37 * Only error handler commands allowed */ 38 SDEV_DEL, /* device deleted 39 * no commands allowed */ 40 SDEV_QUIESCE, /* Device quiescent. No block commands 41 * will be accepted, only specials (which 42 * originate in the mid-layer) */ 43 SDEV_OFFLINE, /* Device offlined (by error handling or 44 * user request */ 45 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 46 SDEV_BLOCK, /* Device blocked by scsi lld. No 47 * scsi commands from user or midlayer 48 * should be issued to the scsi 49 * lld. */ 50 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 51 }; 52 53 enum scsi_scan_mode { 54 SCSI_SCAN_INITIAL = 0, 55 SCSI_SCAN_RESCAN, 56 SCSI_SCAN_MANUAL, 57 }; 58 59 enum scsi_device_event { 60 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 61 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 62 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 63 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 64 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 65 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 66 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 67 68 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 69 SDEV_EVT_LAST = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, 70 71 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 72 }; 73 74 struct scsi_event { 75 enum scsi_device_event evt_type; 76 struct list_head node; 77 78 /* put union of data structures, for non-simple event types, 79 * here 80 */ 81 }; 82 83 struct scsi_device { 84 struct Scsi_Host *host; 85 struct request_queue *request_queue; 86 87 /* the next two are protected by the host->host_lock */ 88 struct list_head siblings; /* list of all devices on this host */ 89 struct list_head same_target_siblings; /* just the devices sharing same target id */ 90 91 atomic_t device_busy; /* commands actually active on LLDD */ 92 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 93 94 spinlock_t list_lock; 95 struct list_head cmd_list; /* queue of in use SCSI Command structures */ 96 struct list_head starved_entry; 97 unsigned short queue_depth; /* How deep of a queue we want */ 98 unsigned short max_queue_depth; /* max queue depth */ 99 unsigned short last_queue_full_depth; /* These two are used by */ 100 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 101 unsigned long last_queue_full_time; /* last queue full time */ 102 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 103 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 104 105 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 106 107 unsigned int id, channel; 108 u64 lun; 109 unsigned int manufacturer; /* Manufacturer of device, for using 110 * vendor-specific cmd's */ 111 unsigned sector_size; /* size in bytes */ 112 113 void *hostdata; /* available to low-level driver */ 114 char type; 115 char scsi_level; 116 char inq_periph_qual; /* PQ from INQUIRY data */ 117 struct mutex inquiry_mutex; 118 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 119 unsigned char * inquiry; /* INQUIRY response data */ 120 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 121 const char * model; /* ... after scan; point to static string */ 122 const char * rev; /* ... "nullnullnullnull" before scan */ 123 124 #define SCSI_VPD_PG_LEN 255 125 int vpd_pg83_len; 126 unsigned char __rcu *vpd_pg83; 127 int vpd_pg80_len; 128 unsigned char __rcu *vpd_pg80; 129 unsigned char current_tag; /* current tag */ 130 struct scsi_target *sdev_target; /* used only for single_lun */ 131 132 unsigned int sdev_bflags; /* black/white flags as also found in 133 * scsi_devinfo.[hc]. For now used only to 134 * pass settings from slave_alloc to scsi 135 * core. */ 136 unsigned int eh_timeout; /* Error handling timeout */ 137 unsigned removable:1; 138 unsigned changed:1; /* Data invalid due to media change */ 139 unsigned busy:1; /* Used to prevent races */ 140 unsigned lockable:1; /* Able to prevent media removal */ 141 unsigned locked:1; /* Media removal disabled */ 142 unsigned borken:1; /* Tell the Seagate driver to be 143 * painfully slow on this device */ 144 unsigned disconnect:1; /* can disconnect */ 145 unsigned soft_reset:1; /* Uses soft reset option */ 146 unsigned sdtr:1; /* Device supports SDTR messages */ 147 unsigned wdtr:1; /* Device supports WDTR messages */ 148 unsigned ppr:1; /* Device supports PPR messages */ 149 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 150 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 151 unsigned was_reset:1; /* There was a bus reset on the bus for 152 * this device */ 153 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 154 * because we did a bus reset. */ 155 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 156 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 157 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 158 unsigned no_write_same:1; /* no WRITE SAME command */ 159 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 160 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 161 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 162 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 163 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 164 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 165 unsigned no_start_on_add:1; /* do not issue start on add */ 166 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 167 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 168 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 169 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 170 unsigned select_no_atn:1; 171 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 172 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 173 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 174 unsigned last_sector_bug:1; /* do not use multisector accesses on 175 SD_LAST_BUGGY_SECTORS */ 176 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 177 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 178 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 179 unsigned security_supported:1; /* Supports Security Protocols */ 180 unsigned is_visible:1; /* is the device visible in sysfs */ 181 unsigned wce_default_on:1; /* Cache is ON by default */ 182 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 183 unsigned broken_fua:1; /* Don't set FUA bit */ 184 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 185 186 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 187 188 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 189 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 190 struct list_head event_list; /* asserted events */ 191 struct work_struct event_work; 192 193 unsigned int max_device_blocked; /* what device_blocked counts down from */ 194 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 195 196 atomic_t iorequest_cnt; 197 atomic_t iodone_cnt; 198 atomic_t ioerr_cnt; 199 200 struct device sdev_gendev, 201 sdev_dev; 202 203 struct execute_work ew; /* used to get process context on put */ 204 struct work_struct requeue_work; 205 206 struct scsi_device_handler *handler; 207 void *handler_data; 208 209 unsigned char access_state; 210 struct mutex state_mutex; 211 enum scsi_device_state sdev_state; 212 unsigned long sdev_data[0]; 213 } __attribute__((aligned(sizeof(unsigned long)))); 214 215 #define to_scsi_device(d) \ 216 container_of(d, struct scsi_device, sdev_gendev) 217 #define class_to_sdev(d) \ 218 container_of(d, struct scsi_device, sdev_dev) 219 #define transport_class_to_sdev(class_dev) \ 220 to_scsi_device(class_dev->parent) 221 222 #define sdev_dbg(sdev, fmt, a...) \ 223 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 224 225 /* 226 * like scmd_printk, but the device name is passed in 227 * as a string pointer 228 */ 229 __printf(4, 5) void 230 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 231 const char *, ...); 232 233 #define sdev_printk(l, sdev, fmt, a...) \ 234 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 235 236 __printf(3, 4) void 237 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 238 239 #define scmd_dbg(scmd, fmt, a...) \ 240 do { \ 241 if ((scmd)->request->rq_disk) \ 242 sdev_dbg((scmd)->device, "[%s] " fmt, \ 243 (scmd)->request->rq_disk->disk_name, ##a);\ 244 else \ 245 sdev_dbg((scmd)->device, fmt, ##a); \ 246 } while (0) 247 248 enum scsi_target_state { 249 STARGET_CREATED = 1, 250 STARGET_RUNNING, 251 STARGET_REMOVE, 252 STARGET_CREATED_REMOVE, 253 STARGET_DEL, 254 }; 255 256 /* 257 * scsi_target: representation of a scsi target, for now, this is only 258 * used for single_lun devices. If no one has active IO to the target, 259 * starget_sdev_user is NULL, else it points to the active sdev. 260 */ 261 struct scsi_target { 262 struct scsi_device *starget_sdev_user; 263 struct list_head siblings; 264 struct list_head devices; 265 struct device dev; 266 struct kref reap_ref; /* last put renders target invisible */ 267 unsigned int channel; 268 unsigned int id; /* target id ... replace 269 * scsi_device.id eventually */ 270 unsigned int create:1; /* signal that it needs to be added */ 271 unsigned int single_lun:1; /* Indicates we should only 272 * allow I/O to one of the luns 273 * for the device at a time. */ 274 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 275 * means no lun present. */ 276 unsigned int no_report_luns:1; /* Don't use 277 * REPORT LUNS for scanning. */ 278 unsigned int expecting_lun_change:1; /* A device has reported 279 * a 3F/0E UA, other devices on 280 * the same target will also. */ 281 /* commands actually active on LLD. */ 282 atomic_t target_busy; 283 atomic_t target_blocked; 284 285 /* 286 * LLDs should set this in the slave_alloc host template callout. 287 * If set to zero then there is not limit. 288 */ 289 unsigned int can_queue; 290 unsigned int max_target_blocked; 291 #define SCSI_DEFAULT_TARGET_BLOCKED 3 292 293 char scsi_level; 294 enum scsi_target_state state; 295 void *hostdata; /* available to low-level driver */ 296 unsigned long starget_data[0]; /* for the transport */ 297 /* starget_data must be the last element!!!! */ 298 } __attribute__((aligned(sizeof(unsigned long)))); 299 300 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 301 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 302 { 303 return to_scsi_target(sdev->sdev_gendev.parent); 304 } 305 #define transport_class_to_starget(class_dev) \ 306 to_scsi_target(class_dev->parent) 307 308 #define starget_printk(prefix, starget, fmt, a...) \ 309 dev_printk(prefix, &(starget)->dev, fmt, ##a) 310 311 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 312 uint, uint, u64, void *hostdata); 313 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 314 uint target, u64 lun); 315 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 316 extern void scsi_remove_device(struct scsi_device *); 317 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 318 void scsi_attach_vpd(struct scsi_device *sdev); 319 320 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 321 extern int __must_check scsi_device_get(struct scsi_device *); 322 extern void scsi_device_put(struct scsi_device *); 323 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 324 uint, uint, u64); 325 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 326 uint, uint, u64); 327 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 328 u64); 329 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 330 u64); 331 extern void starget_for_each_device(struct scsi_target *, void *, 332 void (*fn)(struct scsi_device *, void *)); 333 extern void __starget_for_each_device(struct scsi_target *, void *, 334 void (*fn)(struct scsi_device *, 335 void *)); 336 337 /* only exposed to implement shost_for_each_device */ 338 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 339 struct scsi_device *); 340 341 /** 342 * shost_for_each_device - iterate over all devices of a host 343 * @sdev: the &struct scsi_device to use as a cursor 344 * @shost: the &struct scsi_host to iterate over 345 * 346 * Iterator that returns each device attached to @shost. This loop 347 * takes a reference on each device and releases it at the end. If 348 * you break out of the loop, you must call scsi_device_put(sdev). 349 */ 350 #define shost_for_each_device(sdev, shost) \ 351 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 352 (sdev); \ 353 (sdev) = __scsi_iterate_devices((shost), (sdev))) 354 355 /** 356 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 357 * @sdev: the &struct scsi_device to use as a cursor 358 * @shost: the &struct scsi_host to iterate over 359 * 360 * Iterator that returns each device attached to @shost. It does _not_ 361 * take a reference on the scsi_device, so the whole loop must be 362 * protected by shost->host_lock. 363 * 364 * Note: The only reason to use this is because you need to access the 365 * device list in interrupt context. Otherwise you really want to use 366 * shost_for_each_device instead. 367 */ 368 #define __shost_for_each_device(sdev, shost) \ 369 list_for_each_entry((sdev), &((shost)->__devices), siblings) 370 371 extern int scsi_change_queue_depth(struct scsi_device *, int); 372 extern int scsi_track_queue_full(struct scsi_device *, int); 373 374 extern int scsi_set_medium_removal(struct scsi_device *, char); 375 376 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 377 unsigned char *buffer, int len, int timeout, 378 int retries, struct scsi_mode_data *data, 379 struct scsi_sense_hdr *); 380 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 381 int modepage, unsigned char *buffer, int len, 382 int timeout, int retries, 383 struct scsi_mode_data *data, 384 struct scsi_sense_hdr *); 385 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 386 int retries, struct scsi_sense_hdr *sshdr); 387 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 388 int buf_len); 389 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 390 unsigned int len, unsigned char opcode); 391 extern int scsi_device_set_state(struct scsi_device *sdev, 392 enum scsi_device_state state); 393 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 394 gfp_t gfpflags); 395 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 396 extern void sdev_evt_send_simple(struct scsi_device *sdev, 397 enum scsi_device_event evt_type, gfp_t gfpflags); 398 extern int scsi_device_quiesce(struct scsi_device *sdev); 399 extern void scsi_device_resume(struct scsi_device *sdev); 400 extern void scsi_target_quiesce(struct scsi_target *); 401 extern void scsi_target_resume(struct scsi_target *); 402 extern void scsi_scan_target(struct device *parent, unsigned int channel, 403 unsigned int id, u64 lun, 404 enum scsi_scan_mode rescan); 405 extern void scsi_target_reap(struct scsi_target *); 406 extern void scsi_target_block(struct device *); 407 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 408 extern void scsi_remove_target(struct device *); 409 extern const char *scsi_device_state_name(enum scsi_device_state); 410 extern int scsi_is_sdev_device(const struct device *); 411 extern int scsi_is_target_device(const struct device *); 412 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 413 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 414 int data_direction, void *buffer, unsigned bufflen, 415 unsigned char *sense, struct scsi_sense_hdr *sshdr, 416 int timeout, int retries, u64 flags, 417 req_flags_t rq_flags, int *resid); 418 static inline int scsi_execute_req(struct scsi_device *sdev, 419 const unsigned char *cmd, int data_direction, void *buffer, 420 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 421 int retries, int *resid) 422 { 423 return scsi_execute(sdev, cmd, data_direction, buffer, 424 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 425 } 426 extern void sdev_disable_disk_events(struct scsi_device *sdev); 427 extern void sdev_enable_disk_events(struct scsi_device *sdev); 428 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 429 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 430 431 #ifdef CONFIG_PM 432 extern int scsi_autopm_get_device(struct scsi_device *); 433 extern void scsi_autopm_put_device(struct scsi_device *); 434 #else 435 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 436 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 437 #endif /* CONFIG_PM */ 438 439 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 440 { 441 return device_reprobe(&sdev->sdev_gendev); 442 } 443 444 static inline unsigned int sdev_channel(struct scsi_device *sdev) 445 { 446 return sdev->channel; 447 } 448 449 static inline unsigned int sdev_id(struct scsi_device *sdev) 450 { 451 return sdev->id; 452 } 453 454 #define scmd_id(scmd) sdev_id((scmd)->device) 455 #define scmd_channel(scmd) sdev_channel((scmd)->device) 456 457 /* 458 * checks for positions of the SCSI state machine 459 */ 460 static inline int scsi_device_online(struct scsi_device *sdev) 461 { 462 return (sdev->sdev_state != SDEV_OFFLINE && 463 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 464 sdev->sdev_state != SDEV_DEL); 465 } 466 static inline int scsi_device_blocked(struct scsi_device *sdev) 467 { 468 return sdev->sdev_state == SDEV_BLOCK || 469 sdev->sdev_state == SDEV_CREATED_BLOCK; 470 } 471 static inline int scsi_device_created(struct scsi_device *sdev) 472 { 473 return sdev->sdev_state == SDEV_CREATED || 474 sdev->sdev_state == SDEV_CREATED_BLOCK; 475 } 476 477 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 478 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 479 enum scsi_device_state new_state); 480 481 /* accessor functions for the SCSI parameters */ 482 static inline int scsi_device_sync(struct scsi_device *sdev) 483 { 484 return sdev->sdtr; 485 } 486 static inline int scsi_device_wide(struct scsi_device *sdev) 487 { 488 return sdev->wdtr; 489 } 490 static inline int scsi_device_dt(struct scsi_device *sdev) 491 { 492 return sdev->ppr; 493 } 494 static inline int scsi_device_dt_only(struct scsi_device *sdev) 495 { 496 if (sdev->inquiry_len < 57) 497 return 0; 498 return (sdev->inquiry[56] & 0x0c) == 0x04; 499 } 500 static inline int scsi_device_ius(struct scsi_device *sdev) 501 { 502 if (sdev->inquiry_len < 57) 503 return 0; 504 return sdev->inquiry[56] & 0x01; 505 } 506 static inline int scsi_device_qas(struct scsi_device *sdev) 507 { 508 if (sdev->inquiry_len < 57) 509 return 0; 510 return sdev->inquiry[56] & 0x02; 511 } 512 static inline int scsi_device_enclosure(struct scsi_device *sdev) 513 { 514 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 515 } 516 517 static inline int scsi_device_protection(struct scsi_device *sdev) 518 { 519 if (sdev->no_dif) 520 return 0; 521 522 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 523 } 524 525 static inline int scsi_device_tpgs(struct scsi_device *sdev) 526 { 527 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 528 } 529 530 /** 531 * scsi_device_supports_vpd - test if a device supports VPD pages 532 * @sdev: the &struct scsi_device to test 533 * 534 * If the 'try_vpd_pages' flag is set it takes precedence. 535 * Otherwise we will assume VPD pages are supported if the 536 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 537 */ 538 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 539 { 540 /* Attempt VPD inquiry if the device blacklist explicitly calls 541 * for it. 542 */ 543 if (sdev->try_vpd_pages) 544 return 1; 545 /* 546 * Although VPD inquiries can go to SCSI-2 type devices, 547 * some USB ones crash on receiving them, and the pages 548 * we currently ask for are mandatory for SPC-2 and beyond 549 */ 550 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 551 return 1; 552 return 0; 553 } 554 555 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 556 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 557 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 558 559 #endif /* _SCSI_SCSI_DEVICE_H */ 560