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