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