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 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 196 197 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 198 199 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 200 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 201 struct list_head event_list; /* asserted events */ 202 struct work_struct event_work; 203 204 unsigned int max_device_blocked; /* what device_blocked counts down from */ 205 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 206 207 atomic_t iorequest_cnt; 208 atomic_t iodone_cnt; 209 atomic_t ioerr_cnt; 210 211 struct device sdev_gendev, 212 sdev_dev; 213 214 struct execute_work ew; /* used to get process context on put */ 215 struct work_struct requeue_work; 216 217 struct scsi_device_handler *handler; 218 void *handler_data; 219 220 unsigned char access_state; 221 struct mutex state_mutex; 222 enum scsi_device_state sdev_state; 223 unsigned long sdev_data[0]; 224 } __attribute__((aligned(sizeof(unsigned long)))); 225 226 #define to_scsi_device(d) \ 227 container_of(d, struct scsi_device, sdev_gendev) 228 #define class_to_sdev(d) \ 229 container_of(d, struct scsi_device, sdev_dev) 230 #define transport_class_to_sdev(class_dev) \ 231 to_scsi_device(class_dev->parent) 232 233 #define sdev_dbg(sdev, fmt, a...) \ 234 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 235 236 /* 237 * like scmd_printk, but the device name is passed in 238 * as a string pointer 239 */ 240 __printf(4, 5) void 241 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 242 const char *, ...); 243 244 #define sdev_printk(l, sdev, fmt, a...) \ 245 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 246 247 __printf(3, 4) void 248 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 249 250 #define scmd_dbg(scmd, fmt, a...) \ 251 do { \ 252 if ((scmd)->request->rq_disk) \ 253 sdev_dbg((scmd)->device, "[%s] " fmt, \ 254 (scmd)->request->rq_disk->disk_name, ##a);\ 255 else \ 256 sdev_dbg((scmd)->device, fmt, ##a); \ 257 } while (0) 258 259 enum scsi_target_state { 260 STARGET_CREATED = 1, 261 STARGET_RUNNING, 262 STARGET_REMOVE, 263 STARGET_CREATED_REMOVE, 264 STARGET_DEL, 265 }; 266 267 /* 268 * scsi_target: representation of a scsi target, for now, this is only 269 * used for single_lun devices. If no one has active IO to the target, 270 * starget_sdev_user is NULL, else it points to the active sdev. 271 */ 272 struct scsi_target { 273 struct scsi_device *starget_sdev_user; 274 struct list_head siblings; 275 struct list_head devices; 276 struct device dev; 277 struct kref reap_ref; /* last put renders target invisible */ 278 unsigned int channel; 279 unsigned int id; /* target id ... replace 280 * scsi_device.id eventually */ 281 unsigned int create:1; /* signal that it needs to be added */ 282 unsigned int single_lun:1; /* Indicates we should only 283 * allow I/O to one of the luns 284 * for the device at a time. */ 285 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 286 * means no lun present. */ 287 unsigned int no_report_luns:1; /* Don't use 288 * REPORT LUNS for scanning. */ 289 unsigned int expecting_lun_change:1; /* A device has reported 290 * a 3F/0E UA, other devices on 291 * the same target will also. */ 292 /* commands actually active on LLD. */ 293 atomic_t target_busy; 294 atomic_t target_blocked; 295 296 /* 297 * LLDs should set this in the slave_alloc host template callout. 298 * If set to zero then there is not limit. 299 */ 300 unsigned int can_queue; 301 unsigned int max_target_blocked; 302 #define SCSI_DEFAULT_TARGET_BLOCKED 3 303 304 char scsi_level; 305 enum scsi_target_state state; 306 void *hostdata; /* available to low-level driver */ 307 unsigned long starget_data[0]; /* for the transport */ 308 /* starget_data must be the last element!!!! */ 309 } __attribute__((aligned(sizeof(unsigned long)))); 310 311 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 312 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 313 { 314 return to_scsi_target(sdev->sdev_gendev.parent); 315 } 316 #define transport_class_to_starget(class_dev) \ 317 to_scsi_target(class_dev->parent) 318 319 #define starget_printk(prefix, starget, fmt, a...) \ 320 dev_printk(prefix, &(starget)->dev, fmt, ##a) 321 322 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 323 uint, uint, u64, void *hostdata); 324 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 325 uint target, u64 lun); 326 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 327 extern void scsi_remove_device(struct scsi_device *); 328 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 329 void scsi_attach_vpd(struct scsi_device *sdev); 330 331 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 332 extern int __must_check scsi_device_get(struct scsi_device *); 333 extern void scsi_device_put(struct scsi_device *); 334 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 335 uint, uint, u64); 336 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 337 uint, uint, u64); 338 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 339 u64); 340 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 341 u64); 342 extern void starget_for_each_device(struct scsi_target *, void *, 343 void (*fn)(struct scsi_device *, void *)); 344 extern void __starget_for_each_device(struct scsi_target *, void *, 345 void (*fn)(struct scsi_device *, 346 void *)); 347 348 /* only exposed to implement shost_for_each_device */ 349 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 350 struct scsi_device *); 351 352 /** 353 * shost_for_each_device - iterate over all devices of a host 354 * @sdev: the &struct scsi_device to use as a cursor 355 * @shost: the &struct scsi_host to iterate over 356 * 357 * Iterator that returns each device attached to @shost. This loop 358 * takes a reference on each device and releases it at the end. If 359 * you break out of the loop, you must call scsi_device_put(sdev). 360 */ 361 #define shost_for_each_device(sdev, shost) \ 362 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 363 (sdev); \ 364 (sdev) = __scsi_iterate_devices((shost), (sdev))) 365 366 /** 367 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 368 * @sdev: the &struct scsi_device to use as a cursor 369 * @shost: the &struct scsi_host to iterate over 370 * 371 * Iterator that returns each device attached to @shost. It does _not_ 372 * take a reference on the scsi_device, so the whole loop must be 373 * protected by shost->host_lock. 374 * 375 * Note: The only reason to use this is because you need to access the 376 * device list in interrupt context. Otherwise you really want to use 377 * shost_for_each_device instead. 378 */ 379 #define __shost_for_each_device(sdev, shost) \ 380 list_for_each_entry((sdev), &((shost)->__devices), siblings) 381 382 extern int scsi_change_queue_depth(struct scsi_device *, int); 383 extern int scsi_track_queue_full(struct scsi_device *, int); 384 385 extern int scsi_set_medium_removal(struct scsi_device *, char); 386 387 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 388 unsigned char *buffer, int len, int timeout, 389 int retries, struct scsi_mode_data *data, 390 struct scsi_sense_hdr *); 391 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 392 int modepage, unsigned char *buffer, int len, 393 int timeout, int retries, 394 struct scsi_mode_data *data, 395 struct scsi_sense_hdr *); 396 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 397 int retries, struct scsi_sense_hdr *sshdr); 398 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 399 int buf_len); 400 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 401 unsigned int len, unsigned char opcode); 402 extern int scsi_device_set_state(struct scsi_device *sdev, 403 enum scsi_device_state state); 404 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 405 gfp_t gfpflags); 406 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 407 extern void sdev_evt_send_simple(struct scsi_device *sdev, 408 enum scsi_device_event evt_type, gfp_t gfpflags); 409 extern int scsi_device_quiesce(struct scsi_device *sdev); 410 extern void scsi_device_resume(struct scsi_device *sdev); 411 extern void scsi_target_quiesce(struct scsi_target *); 412 extern void scsi_target_resume(struct scsi_target *); 413 extern void scsi_scan_target(struct device *parent, unsigned int channel, 414 unsigned int id, u64 lun, 415 enum scsi_scan_mode rescan); 416 extern void scsi_target_reap(struct scsi_target *); 417 extern void scsi_target_block(struct device *); 418 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 419 extern void scsi_remove_target(struct device *); 420 extern const char *scsi_device_state_name(enum scsi_device_state); 421 extern int scsi_is_sdev_device(const struct device *); 422 extern int scsi_is_target_device(const struct device *); 423 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 424 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 425 int data_direction, void *buffer, unsigned bufflen, 426 unsigned char *sense, struct scsi_sense_hdr *sshdr, 427 int timeout, int retries, u64 flags, 428 req_flags_t rq_flags, int *resid); 429 static inline int scsi_execute_req(struct scsi_device *sdev, 430 const unsigned char *cmd, int data_direction, void *buffer, 431 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 432 int retries, int *resid) 433 { 434 return scsi_execute(sdev, cmd, data_direction, buffer, 435 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 436 } 437 extern void sdev_disable_disk_events(struct scsi_device *sdev); 438 extern void sdev_enable_disk_events(struct scsi_device *sdev); 439 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 440 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 441 442 #ifdef CONFIG_PM 443 extern int scsi_autopm_get_device(struct scsi_device *); 444 extern void scsi_autopm_put_device(struct scsi_device *); 445 #else 446 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 447 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 448 #endif /* CONFIG_PM */ 449 450 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 451 { 452 return device_reprobe(&sdev->sdev_gendev); 453 } 454 455 static inline unsigned int sdev_channel(struct scsi_device *sdev) 456 { 457 return sdev->channel; 458 } 459 460 static inline unsigned int sdev_id(struct scsi_device *sdev) 461 { 462 return sdev->id; 463 } 464 465 #define scmd_id(scmd) sdev_id((scmd)->device) 466 #define scmd_channel(scmd) sdev_channel((scmd)->device) 467 468 /* 469 * checks for positions of the SCSI state machine 470 */ 471 static inline int scsi_device_online(struct scsi_device *sdev) 472 { 473 return (sdev->sdev_state != SDEV_OFFLINE && 474 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 475 sdev->sdev_state != SDEV_DEL); 476 } 477 static inline int scsi_device_blocked(struct scsi_device *sdev) 478 { 479 return sdev->sdev_state == SDEV_BLOCK || 480 sdev->sdev_state == SDEV_CREATED_BLOCK; 481 } 482 static inline int scsi_device_created(struct scsi_device *sdev) 483 { 484 return sdev->sdev_state == SDEV_CREATED || 485 sdev->sdev_state == SDEV_CREATED_BLOCK; 486 } 487 488 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 489 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 490 enum scsi_device_state new_state); 491 492 /* accessor functions for the SCSI parameters */ 493 static inline int scsi_device_sync(struct scsi_device *sdev) 494 { 495 return sdev->sdtr; 496 } 497 static inline int scsi_device_wide(struct scsi_device *sdev) 498 { 499 return sdev->wdtr; 500 } 501 static inline int scsi_device_dt(struct scsi_device *sdev) 502 { 503 return sdev->ppr; 504 } 505 static inline int scsi_device_dt_only(struct scsi_device *sdev) 506 { 507 if (sdev->inquiry_len < 57) 508 return 0; 509 return (sdev->inquiry[56] & 0x0c) == 0x04; 510 } 511 static inline int scsi_device_ius(struct scsi_device *sdev) 512 { 513 if (sdev->inquiry_len < 57) 514 return 0; 515 return sdev->inquiry[56] & 0x01; 516 } 517 static inline int scsi_device_qas(struct scsi_device *sdev) 518 { 519 if (sdev->inquiry_len < 57) 520 return 0; 521 return sdev->inquiry[56] & 0x02; 522 } 523 static inline int scsi_device_enclosure(struct scsi_device *sdev) 524 { 525 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 526 } 527 528 static inline int scsi_device_protection(struct scsi_device *sdev) 529 { 530 if (sdev->no_dif) 531 return 0; 532 533 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 534 } 535 536 static inline int scsi_device_tpgs(struct scsi_device *sdev) 537 { 538 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 539 } 540 541 /** 542 * scsi_device_supports_vpd - test if a device supports VPD pages 543 * @sdev: the &struct scsi_device to test 544 * 545 * If the 'try_vpd_pages' flag is set it takes precedence. 546 * Otherwise we will assume VPD pages are supported if the 547 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 548 */ 549 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 550 { 551 /* Attempt VPD inquiry if the device blacklist explicitly calls 552 * for it. 553 */ 554 if (sdev->try_vpd_pages) 555 return 1; 556 /* 557 * Although VPD inquiries can go to SCSI-2 type devices, 558 * some USB ones crash on receiving them, and the pages 559 * we currently ask for are mandatory for SPC-2 and beyond 560 */ 561 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 562 return 1; 563 return 0; 564 } 565 566 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 567 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 568 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 569 570 #endif /* _SCSI_SCSI_DEVICE_H */ 571