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 typedef unsigned int __bitwise blist_flags_t; 19 20 struct scsi_mode_data { 21 __u32 length; 22 __u16 block_descriptor_length; 23 __u8 medium_type; 24 __u8 device_specific; 25 __u8 header_length; 26 __u8 longlba:1; 27 }; 28 29 /* 30 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 31 * (for the ascii descriptions) and the state model enforcer: 32 * scsi_lib:scsi_device_set_state(). 33 */ 34 enum scsi_device_state { 35 SDEV_CREATED = 1, /* device created but not added to sysfs 36 * Only internal commands allowed (for inq) */ 37 SDEV_RUNNING, /* device properly configured 38 * All commands allowed */ 39 SDEV_CANCEL, /* beginning to delete device 40 * Only error handler commands allowed */ 41 SDEV_DEL, /* device deleted 42 * no commands allowed */ 43 SDEV_QUIESCE, /* Device quiescent. No block commands 44 * will be accepted, only specials (which 45 * originate in the mid-layer) */ 46 SDEV_OFFLINE, /* Device offlined (by error handling or 47 * user request */ 48 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 49 SDEV_BLOCK, /* Device blocked by scsi lld. No 50 * scsi commands from user or midlayer 51 * should be issued to the scsi 52 * lld. */ 53 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 54 }; 55 56 enum scsi_scan_mode { 57 SCSI_SCAN_INITIAL = 0, 58 SCSI_SCAN_RESCAN, 59 SCSI_SCAN_MANUAL, 60 }; 61 62 enum scsi_device_event { 63 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 64 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 65 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 66 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 67 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 68 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 69 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 70 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 71 72 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 73 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 74 75 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 76 }; 77 78 struct scsi_event { 79 enum scsi_device_event evt_type; 80 struct list_head node; 81 82 /* put union of data structures, for non-simple event types, 83 * here 84 */ 85 }; 86 87 /** 88 * struct scsi_vpd - SCSI Vital Product Data 89 * @rcu: For kfree_rcu(). 90 * @len: Length in bytes of @data. 91 * @data: VPD data as defined in various T10 SCSI standard documents. 92 */ 93 struct scsi_vpd { 94 struct rcu_head rcu; 95 int len; 96 unsigned char data[]; 97 }; 98 99 struct scsi_device { 100 struct Scsi_Host *host; 101 struct request_queue *request_queue; 102 103 /* the next two are protected by the host->host_lock */ 104 struct list_head siblings; /* list of all devices on this host */ 105 struct list_head same_target_siblings; /* just the devices sharing same target id */ 106 107 atomic_t device_busy; /* commands actually active on LLDD */ 108 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 109 110 spinlock_t list_lock; 111 struct list_head cmd_list; /* queue of in use SCSI Command structures */ 112 struct list_head starved_entry; 113 unsigned short queue_depth; /* How deep of a queue we want */ 114 unsigned short max_queue_depth; /* max queue depth */ 115 unsigned short last_queue_full_depth; /* These two are used by */ 116 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 117 unsigned long last_queue_full_time; /* last queue full time */ 118 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 119 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 120 121 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 122 123 unsigned int id, channel; 124 u64 lun; 125 unsigned int manufacturer; /* Manufacturer of device, for using 126 * vendor-specific cmd's */ 127 unsigned sector_size; /* size in bytes */ 128 129 void *hostdata; /* available to low-level driver */ 130 unsigned char type; 131 char scsi_level; 132 char inq_periph_qual; /* PQ from INQUIRY data */ 133 struct mutex inquiry_mutex; 134 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 135 unsigned char * inquiry; /* INQUIRY response data */ 136 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 137 const char * model; /* ... after scan; point to static string */ 138 const char * rev; /* ... "nullnullnullnull" before scan */ 139 140 #define SCSI_VPD_PG_LEN 255 141 struct scsi_vpd __rcu *vpd_pg83; 142 struct scsi_vpd __rcu *vpd_pg80; 143 unsigned char current_tag; /* current tag */ 144 struct scsi_target *sdev_target; /* used only for single_lun */ 145 146 blist_flags_t sdev_bflags; /* black/white flags as also found in 147 * scsi_devinfo.[hc]. For now used only to 148 * pass settings from slave_alloc to scsi 149 * core. */ 150 unsigned int eh_timeout; /* Error handling timeout */ 151 unsigned removable:1; 152 unsigned changed:1; /* Data invalid due to media change */ 153 unsigned busy:1; /* Used to prevent races */ 154 unsigned lockable:1; /* Able to prevent media removal */ 155 unsigned locked:1; /* Media removal disabled */ 156 unsigned borken:1; /* Tell the Seagate driver to be 157 * painfully slow on this device */ 158 unsigned disconnect:1; /* can disconnect */ 159 unsigned soft_reset:1; /* Uses soft reset option */ 160 unsigned sdtr:1; /* Device supports SDTR messages */ 161 unsigned wdtr:1; /* Device supports WDTR messages */ 162 unsigned ppr:1; /* Device supports PPR messages */ 163 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 164 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 165 unsigned was_reset:1; /* There was a bus reset on the bus for 166 * this device */ 167 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 168 * because we did a bus reset. */ 169 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 170 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 171 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 172 unsigned no_write_same:1; /* no WRITE SAME command */ 173 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 174 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 175 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 176 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 177 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 178 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 179 unsigned no_start_on_add:1; /* do not issue start on add */ 180 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 181 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 182 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 183 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 184 unsigned select_no_atn:1; 185 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 186 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 187 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 188 unsigned last_sector_bug:1; /* do not use multisector accesses on 189 SD_LAST_BUGGY_SECTORS */ 190 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 191 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 192 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 193 unsigned security_supported:1; /* Supports Security Protocols */ 194 unsigned is_visible:1; /* is the device visible in sysfs */ 195 unsigned wce_default_on:1; /* Cache is ON by default */ 196 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 197 unsigned broken_fua:1; /* Don't set FUA bit */ 198 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 199 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 200 201 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 202 203 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 204 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 205 struct list_head event_list; /* asserted events */ 206 struct work_struct event_work; 207 208 unsigned int max_device_blocked; /* what device_blocked counts down from */ 209 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 210 211 atomic_t iorequest_cnt; 212 atomic_t iodone_cnt; 213 atomic_t ioerr_cnt; 214 215 struct device sdev_gendev, 216 sdev_dev; 217 218 struct execute_work ew; /* used to get process context on put */ 219 struct work_struct requeue_work; 220 221 struct scsi_device_handler *handler; 222 void *handler_data; 223 224 unsigned char access_state; 225 struct mutex state_mutex; 226 enum scsi_device_state sdev_state; 227 struct task_struct *quiesced_by; 228 unsigned long sdev_data[0]; 229 } __attribute__((aligned(sizeof(unsigned long)))); 230 231 #define to_scsi_device(d) \ 232 container_of(d, struct scsi_device, sdev_gendev) 233 #define class_to_sdev(d) \ 234 container_of(d, struct scsi_device, sdev_dev) 235 #define transport_class_to_sdev(class_dev) \ 236 to_scsi_device(class_dev->parent) 237 238 #define sdev_dbg(sdev, fmt, a...) \ 239 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 240 241 /* 242 * like scmd_printk, but the device name is passed in 243 * as a string pointer 244 */ 245 __printf(4, 5) void 246 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 247 const char *, ...); 248 249 #define sdev_printk(l, sdev, fmt, a...) \ 250 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 251 252 __printf(3, 4) void 253 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 254 255 #define scmd_dbg(scmd, fmt, a...) \ 256 do { \ 257 if ((scmd)->request->rq_disk) \ 258 sdev_dbg((scmd)->device, "[%s] " fmt, \ 259 (scmd)->request->rq_disk->disk_name, ##a);\ 260 else \ 261 sdev_dbg((scmd)->device, fmt, ##a); \ 262 } while (0) 263 264 enum scsi_target_state { 265 STARGET_CREATED = 1, 266 STARGET_RUNNING, 267 STARGET_REMOVE, 268 STARGET_CREATED_REMOVE, 269 STARGET_DEL, 270 }; 271 272 /* 273 * scsi_target: representation of a scsi target, for now, this is only 274 * used for single_lun devices. If no one has active IO to the target, 275 * starget_sdev_user is NULL, else it points to the active sdev. 276 */ 277 struct scsi_target { 278 struct scsi_device *starget_sdev_user; 279 struct list_head siblings; 280 struct list_head devices; 281 struct device dev; 282 struct kref reap_ref; /* last put renders target invisible */ 283 unsigned int channel; 284 unsigned int id; /* target id ... replace 285 * scsi_device.id eventually */ 286 unsigned int create:1; /* signal that it needs to be added */ 287 unsigned int single_lun:1; /* Indicates we should only 288 * allow I/O to one of the luns 289 * for the device at a time. */ 290 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 291 * means no lun present. */ 292 unsigned int no_report_luns:1; /* Don't use 293 * REPORT LUNS for scanning. */ 294 unsigned int expecting_lun_change:1; /* A device has reported 295 * a 3F/0E UA, other devices on 296 * the same target will also. */ 297 /* commands actually active on LLD. */ 298 atomic_t target_busy; 299 atomic_t target_blocked; 300 301 /* 302 * LLDs should set this in the slave_alloc host template callout. 303 * If set to zero then there is not limit. 304 */ 305 unsigned int can_queue; 306 unsigned int max_target_blocked; 307 #define SCSI_DEFAULT_TARGET_BLOCKED 3 308 309 char scsi_level; 310 enum scsi_target_state state; 311 void *hostdata; /* available to low-level driver */ 312 unsigned long starget_data[0]; /* for the transport */ 313 /* starget_data must be the last element!!!! */ 314 } __attribute__((aligned(sizeof(unsigned long)))); 315 316 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 317 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 318 { 319 return to_scsi_target(sdev->sdev_gendev.parent); 320 } 321 #define transport_class_to_starget(class_dev) \ 322 to_scsi_target(class_dev->parent) 323 324 #define starget_printk(prefix, starget, fmt, a...) \ 325 dev_printk(prefix, &(starget)->dev, fmt, ##a) 326 327 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 328 uint, uint, u64, void *hostdata); 329 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 330 uint target, u64 lun); 331 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 332 extern void scsi_remove_device(struct scsi_device *); 333 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 334 void scsi_attach_vpd(struct scsi_device *sdev); 335 336 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 337 extern int __must_check scsi_device_get(struct scsi_device *); 338 extern void scsi_device_put(struct scsi_device *); 339 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 340 uint, uint, u64); 341 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 342 uint, uint, u64); 343 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 344 u64); 345 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 346 u64); 347 extern void starget_for_each_device(struct scsi_target *, void *, 348 void (*fn)(struct scsi_device *, void *)); 349 extern void __starget_for_each_device(struct scsi_target *, void *, 350 void (*fn)(struct scsi_device *, 351 void *)); 352 353 /* only exposed to implement shost_for_each_device */ 354 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 355 struct scsi_device *); 356 357 /** 358 * shost_for_each_device - iterate over all devices of a host 359 * @sdev: the &struct scsi_device to use as a cursor 360 * @shost: the &struct scsi_host to iterate over 361 * 362 * Iterator that returns each device attached to @shost. This loop 363 * takes a reference on each device and releases it at the end. If 364 * you break out of the loop, you must call scsi_device_put(sdev). 365 */ 366 #define shost_for_each_device(sdev, shost) \ 367 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 368 (sdev); \ 369 (sdev) = __scsi_iterate_devices((shost), (sdev))) 370 371 /** 372 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 373 * @sdev: the &struct scsi_device to use as a cursor 374 * @shost: the &struct scsi_host to iterate over 375 * 376 * Iterator that returns each device attached to @shost. It does _not_ 377 * take a reference on the scsi_device, so the whole loop must be 378 * protected by shost->host_lock. 379 * 380 * Note: The only reason to use this is because you need to access the 381 * device list in interrupt context. Otherwise you really want to use 382 * shost_for_each_device instead. 383 */ 384 #define __shost_for_each_device(sdev, shost) \ 385 list_for_each_entry((sdev), &((shost)->__devices), siblings) 386 387 extern int scsi_change_queue_depth(struct scsi_device *, int); 388 extern int scsi_track_queue_full(struct scsi_device *, int); 389 390 extern int scsi_set_medium_removal(struct scsi_device *, char); 391 392 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 393 unsigned char *buffer, int len, int timeout, 394 int retries, struct scsi_mode_data *data, 395 struct scsi_sense_hdr *); 396 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 397 int modepage, unsigned char *buffer, int len, 398 int timeout, int retries, 399 struct scsi_mode_data *data, 400 struct scsi_sense_hdr *); 401 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 402 int retries, struct scsi_sense_hdr *sshdr); 403 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 404 int buf_len); 405 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 406 unsigned int len, unsigned char opcode); 407 extern int scsi_device_set_state(struct scsi_device *sdev, 408 enum scsi_device_state state); 409 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 410 gfp_t gfpflags); 411 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 412 extern void sdev_evt_send_simple(struct scsi_device *sdev, 413 enum scsi_device_event evt_type, gfp_t gfpflags); 414 extern int scsi_device_quiesce(struct scsi_device *sdev); 415 extern void scsi_device_resume(struct scsi_device *sdev); 416 extern void scsi_target_quiesce(struct scsi_target *); 417 extern void scsi_target_resume(struct scsi_target *); 418 extern void scsi_scan_target(struct device *parent, unsigned int channel, 419 unsigned int id, u64 lun, 420 enum scsi_scan_mode rescan); 421 extern void scsi_target_reap(struct scsi_target *); 422 extern void scsi_target_block(struct device *); 423 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 424 extern void scsi_remove_target(struct device *); 425 extern const char *scsi_device_state_name(enum scsi_device_state); 426 extern int scsi_is_sdev_device(const struct device *); 427 extern int scsi_is_target_device(const struct device *); 428 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 429 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 430 int data_direction, void *buffer, unsigned bufflen, 431 unsigned char *sense, struct scsi_sense_hdr *sshdr, 432 int timeout, int retries, u64 flags, 433 req_flags_t rq_flags, int *resid); 434 static inline int scsi_execute_req(struct scsi_device *sdev, 435 const unsigned char *cmd, int data_direction, void *buffer, 436 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 437 int retries, int *resid) 438 { 439 return scsi_execute(sdev, cmd, data_direction, buffer, 440 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 441 } 442 extern void sdev_disable_disk_events(struct scsi_device *sdev); 443 extern void sdev_enable_disk_events(struct scsi_device *sdev); 444 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 445 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 446 447 #ifdef CONFIG_PM 448 extern int scsi_autopm_get_device(struct scsi_device *); 449 extern void scsi_autopm_put_device(struct scsi_device *); 450 #else 451 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 452 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 453 #endif /* CONFIG_PM */ 454 455 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 456 { 457 return device_reprobe(&sdev->sdev_gendev); 458 } 459 460 static inline unsigned int sdev_channel(struct scsi_device *sdev) 461 { 462 return sdev->channel; 463 } 464 465 static inline unsigned int sdev_id(struct scsi_device *sdev) 466 { 467 return sdev->id; 468 } 469 470 #define scmd_id(scmd) sdev_id((scmd)->device) 471 #define scmd_channel(scmd) sdev_channel((scmd)->device) 472 473 /* 474 * checks for positions of the SCSI state machine 475 */ 476 static inline int scsi_device_online(struct scsi_device *sdev) 477 { 478 return (sdev->sdev_state != SDEV_OFFLINE && 479 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 480 sdev->sdev_state != SDEV_DEL); 481 } 482 static inline int scsi_device_blocked(struct scsi_device *sdev) 483 { 484 return sdev->sdev_state == SDEV_BLOCK || 485 sdev->sdev_state == SDEV_CREATED_BLOCK; 486 } 487 static inline int scsi_device_created(struct scsi_device *sdev) 488 { 489 return sdev->sdev_state == SDEV_CREATED || 490 sdev->sdev_state == SDEV_CREATED_BLOCK; 491 } 492 493 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 494 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 495 enum scsi_device_state new_state); 496 497 /* accessor functions for the SCSI parameters */ 498 static inline int scsi_device_sync(struct scsi_device *sdev) 499 { 500 return sdev->sdtr; 501 } 502 static inline int scsi_device_wide(struct scsi_device *sdev) 503 { 504 return sdev->wdtr; 505 } 506 static inline int scsi_device_dt(struct scsi_device *sdev) 507 { 508 return sdev->ppr; 509 } 510 static inline int scsi_device_dt_only(struct scsi_device *sdev) 511 { 512 if (sdev->inquiry_len < 57) 513 return 0; 514 return (sdev->inquiry[56] & 0x0c) == 0x04; 515 } 516 static inline int scsi_device_ius(struct scsi_device *sdev) 517 { 518 if (sdev->inquiry_len < 57) 519 return 0; 520 return sdev->inquiry[56] & 0x01; 521 } 522 static inline int scsi_device_qas(struct scsi_device *sdev) 523 { 524 if (sdev->inquiry_len < 57) 525 return 0; 526 return sdev->inquiry[56] & 0x02; 527 } 528 static inline int scsi_device_enclosure(struct scsi_device *sdev) 529 { 530 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 531 } 532 533 static inline int scsi_device_protection(struct scsi_device *sdev) 534 { 535 if (sdev->no_dif) 536 return 0; 537 538 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 539 } 540 541 static inline int scsi_device_tpgs(struct scsi_device *sdev) 542 { 543 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 544 } 545 546 /** 547 * scsi_device_supports_vpd - test if a device supports VPD pages 548 * @sdev: the &struct scsi_device to test 549 * 550 * If the 'try_vpd_pages' flag is set it takes precedence. 551 * Otherwise we will assume VPD pages are supported if the 552 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 553 */ 554 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 555 { 556 /* Attempt VPD inquiry if the device blacklist explicitly calls 557 * for it. 558 */ 559 if (sdev->try_vpd_pages) 560 return 1; 561 /* 562 * Although VPD inquiries can go to SCSI-2 type devices, 563 * some USB ones crash on receiving them, and the pages 564 * we currently ask for are mandatory for SPC-2 and beyond 565 */ 566 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 567 return 1; 568 return 0; 569 } 570 571 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 572 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 573 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 574 575 #endif /* _SCSI_SCSI_DEVICE_H */ 576