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 __u64 __bitwise blist_flags_t; 19 20 #define SCSI_SENSE_BUFFERSIZE 96 21 22 struct scsi_mode_data { 23 __u32 length; 24 __u16 block_descriptor_length; 25 __u8 medium_type; 26 __u8 device_specific; 27 __u8 header_length; 28 __u8 longlba:1; 29 }; 30 31 /* 32 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 33 * (for the ascii descriptions) and the state model enforcer: 34 * scsi_lib:scsi_device_set_state(). 35 */ 36 enum scsi_device_state { 37 SDEV_CREATED = 1, /* device created but not added to sysfs 38 * Only internal commands allowed (for inq) */ 39 SDEV_RUNNING, /* device properly configured 40 * All commands allowed */ 41 SDEV_CANCEL, /* beginning to delete device 42 * Only error handler commands allowed */ 43 SDEV_DEL, /* device deleted 44 * no commands allowed */ 45 SDEV_QUIESCE, /* Device quiescent. No block commands 46 * will be accepted, only specials (which 47 * originate in the mid-layer) */ 48 SDEV_OFFLINE, /* Device offlined (by error handling or 49 * user request */ 50 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 51 SDEV_BLOCK, /* Device blocked by scsi lld. No 52 * scsi commands from user or midlayer 53 * should be issued to the scsi 54 * lld. */ 55 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 56 }; 57 58 enum scsi_scan_mode { 59 SCSI_SCAN_INITIAL = 0, 60 SCSI_SCAN_RESCAN, 61 SCSI_SCAN_MANUAL, 62 }; 63 64 enum scsi_device_event { 65 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 66 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 67 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 68 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 69 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 70 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 71 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 72 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 73 74 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 75 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 76 77 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 78 }; 79 80 struct scsi_event { 81 enum scsi_device_event evt_type; 82 struct list_head node; 83 84 /* put union of data structures, for non-simple event types, 85 * here 86 */ 87 }; 88 89 /** 90 * struct scsi_vpd - SCSI Vital Product Data 91 * @rcu: For kfree_rcu(). 92 * @len: Length in bytes of @data. 93 * @data: VPD data as defined in various T10 SCSI standard documents. 94 */ 95 struct scsi_vpd { 96 struct rcu_head rcu; 97 int len; 98 unsigned char data[]; 99 }; 100 101 struct scsi_device { 102 struct Scsi_Host *host; 103 struct request_queue *request_queue; 104 105 /* the next two are protected by the host->host_lock */ 106 struct list_head siblings; /* list of all devices on this host */ 107 struct list_head same_target_siblings; /* just the devices sharing same target id */ 108 109 atomic_t device_busy; /* commands actually active on LLDD */ 110 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 111 112 spinlock_t list_lock; 113 struct list_head cmd_list; /* queue of in use SCSI Command structures */ 114 struct list_head starved_entry; 115 unsigned short queue_depth; /* How deep of a queue we want */ 116 unsigned short max_queue_depth; /* max queue depth */ 117 unsigned short last_queue_full_depth; /* These two are used by */ 118 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 119 unsigned long last_queue_full_time; /* last queue full time */ 120 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 121 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 122 123 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 124 125 unsigned int id, channel; 126 u64 lun; 127 unsigned int manufacturer; /* Manufacturer of device, for using 128 * vendor-specific cmd's */ 129 unsigned sector_size; /* size in bytes */ 130 131 void *hostdata; /* available to low-level driver */ 132 unsigned char type; 133 char scsi_level; 134 char inq_periph_qual; /* PQ from INQUIRY data */ 135 struct mutex inquiry_mutex; 136 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 137 unsigned char * inquiry; /* INQUIRY response data */ 138 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 139 const char * model; /* ... after scan; point to static string */ 140 const char * rev; /* ... "nullnullnullnull" before scan */ 141 142 #define SCSI_VPD_PG_LEN 255 143 struct scsi_vpd __rcu *vpd_pg0; 144 struct scsi_vpd __rcu *vpd_pg83; 145 struct scsi_vpd __rcu *vpd_pg80; 146 struct scsi_vpd __rcu *vpd_pg89; 147 unsigned char current_tag; /* current tag */ 148 struct scsi_target *sdev_target; /* used only for single_lun */ 149 150 blist_flags_t sdev_bflags; /* black/white flags as also found in 151 * scsi_devinfo.[hc]. For now used only to 152 * pass settings from slave_alloc to scsi 153 * core. */ 154 unsigned int eh_timeout; /* Error handling timeout */ 155 unsigned removable:1; 156 unsigned changed:1; /* Data invalid due to media change */ 157 unsigned busy:1; /* Used to prevent races */ 158 unsigned lockable:1; /* Able to prevent media removal */ 159 unsigned locked:1; /* Media removal disabled */ 160 unsigned borken:1; /* Tell the Seagate driver to be 161 * painfully slow on this device */ 162 unsigned disconnect:1; /* can disconnect */ 163 unsigned soft_reset:1; /* Uses soft reset option */ 164 unsigned sdtr:1; /* Device supports SDTR messages */ 165 unsigned wdtr:1; /* Device supports WDTR messages */ 166 unsigned ppr:1; /* Device supports PPR messages */ 167 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 168 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 169 unsigned was_reset:1; /* There was a bus reset on the bus for 170 * this device */ 171 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 172 * because we did a bus reset. */ 173 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 174 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 175 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 176 unsigned no_write_same:1; /* no WRITE SAME command */ 177 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 178 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 179 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 180 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 181 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 182 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 183 unsigned no_start_on_add:1; /* do not issue start on add */ 184 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 185 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 186 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 187 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 188 unsigned select_no_atn:1; 189 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 190 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 191 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 192 unsigned last_sector_bug:1; /* do not use multisector accesses on 193 SD_LAST_BUGGY_SECTORS */ 194 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 195 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 196 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 197 unsigned security_supported:1; /* Supports Security Protocols */ 198 unsigned is_visible:1; /* is the device visible in sysfs */ 199 unsigned wce_default_on:1; /* Cache is ON by default */ 200 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 201 unsigned broken_fua:1; /* Don't set FUA bit */ 202 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 203 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 204 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 205 * creation time */ 206 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 207 208 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 209 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 210 struct list_head event_list; /* asserted events */ 211 struct work_struct event_work; 212 213 unsigned int max_device_blocked; /* what device_blocked counts down from */ 214 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 215 216 atomic_t iorequest_cnt; 217 atomic_t iodone_cnt; 218 atomic_t ioerr_cnt; 219 220 struct device sdev_gendev, 221 sdev_dev; 222 223 struct execute_work ew; /* used to get process context on put */ 224 struct work_struct requeue_work; 225 226 struct scsi_device_handler *handler; 227 void *handler_data; 228 229 unsigned char access_state; 230 struct mutex state_mutex; 231 enum scsi_device_state sdev_state; 232 struct task_struct *quiesced_by; 233 unsigned long sdev_data[0]; 234 } __attribute__((aligned(sizeof(unsigned long)))); 235 236 #define to_scsi_device(d) \ 237 container_of(d, struct scsi_device, sdev_gendev) 238 #define class_to_sdev(d) \ 239 container_of(d, struct scsi_device, sdev_dev) 240 #define transport_class_to_sdev(class_dev) \ 241 to_scsi_device(class_dev->parent) 242 243 #define sdev_dbg(sdev, fmt, a...) \ 244 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 245 246 /* 247 * like scmd_printk, but the device name is passed in 248 * as a string pointer 249 */ 250 __printf(4, 5) void 251 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 252 const char *, ...); 253 254 #define sdev_printk(l, sdev, fmt, a...) \ 255 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 256 257 __printf(3, 4) void 258 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 259 260 #define scmd_dbg(scmd, fmt, a...) \ 261 do { \ 262 if ((scmd)->request->rq_disk) \ 263 sdev_dbg((scmd)->device, "[%s] " fmt, \ 264 (scmd)->request->rq_disk->disk_name, ##a);\ 265 else \ 266 sdev_dbg((scmd)->device, fmt, ##a); \ 267 } while (0) 268 269 enum scsi_target_state { 270 STARGET_CREATED = 1, 271 STARGET_RUNNING, 272 STARGET_REMOVE, 273 STARGET_CREATED_REMOVE, 274 STARGET_DEL, 275 }; 276 277 /* 278 * scsi_target: representation of a scsi target, for now, this is only 279 * used for single_lun devices. If no one has active IO to the target, 280 * starget_sdev_user is NULL, else it points to the active sdev. 281 */ 282 struct scsi_target { 283 struct scsi_device *starget_sdev_user; 284 struct list_head siblings; 285 struct list_head devices; 286 struct device dev; 287 struct kref reap_ref; /* last put renders target invisible */ 288 unsigned int channel; 289 unsigned int id; /* target id ... replace 290 * scsi_device.id eventually */ 291 unsigned int create:1; /* signal that it needs to be added */ 292 unsigned int single_lun:1; /* Indicates we should only 293 * allow I/O to one of the luns 294 * for the device at a time. */ 295 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 296 * means no lun present. */ 297 unsigned int no_report_luns:1; /* Don't use 298 * REPORT LUNS for scanning. */ 299 unsigned int expecting_lun_change:1; /* A device has reported 300 * a 3F/0E UA, other devices on 301 * the same target will also. */ 302 /* commands actually active on LLD. */ 303 atomic_t target_busy; 304 atomic_t target_blocked; 305 306 /* 307 * LLDs should set this in the slave_alloc host template callout. 308 * If set to zero then there is not limit. 309 */ 310 unsigned int can_queue; 311 unsigned int max_target_blocked; 312 #define SCSI_DEFAULT_TARGET_BLOCKED 3 313 314 char scsi_level; 315 enum scsi_target_state state; 316 void *hostdata; /* available to low-level driver */ 317 unsigned long starget_data[0]; /* for the transport */ 318 /* starget_data must be the last element!!!! */ 319 } __attribute__((aligned(sizeof(unsigned long)))); 320 321 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 322 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 323 { 324 return to_scsi_target(sdev->sdev_gendev.parent); 325 } 326 #define transport_class_to_starget(class_dev) \ 327 to_scsi_target(class_dev->parent) 328 329 #define starget_printk(prefix, starget, fmt, a...) \ 330 dev_printk(prefix, &(starget)->dev, fmt, ##a) 331 332 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 333 uint, uint, u64, void *hostdata); 334 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 335 uint target, u64 lun); 336 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 337 extern void scsi_remove_device(struct scsi_device *); 338 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 339 void scsi_attach_vpd(struct scsi_device *sdev); 340 341 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 342 extern int __must_check scsi_device_get(struct scsi_device *); 343 extern void scsi_device_put(struct scsi_device *); 344 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 345 uint, uint, u64); 346 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 347 uint, uint, u64); 348 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 349 u64); 350 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 351 u64); 352 extern void starget_for_each_device(struct scsi_target *, void *, 353 void (*fn)(struct scsi_device *, void *)); 354 extern void __starget_for_each_device(struct scsi_target *, void *, 355 void (*fn)(struct scsi_device *, 356 void *)); 357 358 /* only exposed to implement shost_for_each_device */ 359 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 360 struct scsi_device *); 361 362 /** 363 * shost_for_each_device - iterate over all devices of a host 364 * @sdev: the &struct scsi_device to use as a cursor 365 * @shost: the &struct scsi_host to iterate over 366 * 367 * Iterator that returns each device attached to @shost. This loop 368 * takes a reference on each device and releases it at the end. If 369 * you break out of the loop, you must call scsi_device_put(sdev). 370 */ 371 #define shost_for_each_device(sdev, shost) \ 372 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 373 (sdev); \ 374 (sdev) = __scsi_iterate_devices((shost), (sdev))) 375 376 /** 377 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 378 * @sdev: the &struct scsi_device to use as a cursor 379 * @shost: the &struct scsi_host to iterate over 380 * 381 * Iterator that returns each device attached to @shost. It does _not_ 382 * take a reference on the scsi_device, so the whole loop must be 383 * protected by shost->host_lock. 384 * 385 * Note: The only reason to use this is because you need to access the 386 * device list in interrupt context. Otherwise you really want to use 387 * shost_for_each_device instead. 388 */ 389 #define __shost_for_each_device(sdev, shost) \ 390 list_for_each_entry((sdev), &((shost)->__devices), siblings) 391 392 extern int scsi_change_queue_depth(struct scsi_device *, int); 393 extern int scsi_track_queue_full(struct scsi_device *, int); 394 395 extern int scsi_set_medium_removal(struct scsi_device *, char); 396 397 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 398 unsigned char *buffer, int len, int timeout, 399 int retries, struct scsi_mode_data *data, 400 struct scsi_sense_hdr *); 401 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 402 int modepage, unsigned char *buffer, int len, 403 int timeout, int retries, 404 struct scsi_mode_data *data, 405 struct scsi_sense_hdr *); 406 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 407 int retries, struct scsi_sense_hdr *sshdr); 408 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 409 int buf_len); 410 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 411 unsigned int len, unsigned char opcode); 412 extern int scsi_device_set_state(struct scsi_device *sdev, 413 enum scsi_device_state state); 414 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 415 gfp_t gfpflags); 416 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 417 extern void sdev_evt_send_simple(struct scsi_device *sdev, 418 enum scsi_device_event evt_type, gfp_t gfpflags); 419 extern int scsi_device_quiesce(struct scsi_device *sdev); 420 extern void scsi_device_resume(struct scsi_device *sdev); 421 extern void scsi_target_quiesce(struct scsi_target *); 422 extern void scsi_target_resume(struct scsi_target *); 423 extern void scsi_scan_target(struct device *parent, unsigned int channel, 424 unsigned int id, u64 lun, 425 enum scsi_scan_mode rescan); 426 extern void scsi_target_reap(struct scsi_target *); 427 extern void scsi_target_block(struct device *); 428 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 429 extern void scsi_remove_target(struct device *); 430 extern const char *scsi_device_state_name(enum scsi_device_state); 431 extern int scsi_is_sdev_device(const struct device *); 432 extern int scsi_is_target_device(const struct device *); 433 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 434 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 435 int data_direction, void *buffer, unsigned bufflen, 436 unsigned char *sense, struct scsi_sense_hdr *sshdr, 437 int timeout, int retries, u64 flags, 438 req_flags_t rq_flags, int *resid); 439 /* Make sure any sense buffer is the correct size. */ 440 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ 441 sshdr, timeout, retries, flags, rq_flags, resid) \ 442 ({ \ 443 BUILD_BUG_ON((sense) != NULL && \ 444 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ 445 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ 446 sense, sshdr, timeout, retries, flags, rq_flags, \ 447 resid); \ 448 }) 449 static inline int scsi_execute_req(struct scsi_device *sdev, 450 const unsigned char *cmd, int data_direction, void *buffer, 451 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 452 int retries, int *resid) 453 { 454 return scsi_execute(sdev, cmd, data_direction, buffer, 455 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 456 } 457 extern void sdev_disable_disk_events(struct scsi_device *sdev); 458 extern void sdev_enable_disk_events(struct scsi_device *sdev); 459 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 460 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 461 462 #ifdef CONFIG_PM 463 extern int scsi_autopm_get_device(struct scsi_device *); 464 extern void scsi_autopm_put_device(struct scsi_device *); 465 #else 466 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 467 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 468 #endif /* CONFIG_PM */ 469 470 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 471 { 472 return device_reprobe(&sdev->sdev_gendev); 473 } 474 475 static inline unsigned int sdev_channel(struct scsi_device *sdev) 476 { 477 return sdev->channel; 478 } 479 480 static inline unsigned int sdev_id(struct scsi_device *sdev) 481 { 482 return sdev->id; 483 } 484 485 #define scmd_id(scmd) sdev_id((scmd)->device) 486 #define scmd_channel(scmd) sdev_channel((scmd)->device) 487 488 /* 489 * checks for positions of the SCSI state machine 490 */ 491 static inline int scsi_device_online(struct scsi_device *sdev) 492 { 493 return (sdev->sdev_state != SDEV_OFFLINE && 494 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 495 sdev->sdev_state != SDEV_DEL); 496 } 497 static inline int scsi_device_blocked(struct scsi_device *sdev) 498 { 499 return sdev->sdev_state == SDEV_BLOCK || 500 sdev->sdev_state == SDEV_CREATED_BLOCK; 501 } 502 static inline int scsi_device_created(struct scsi_device *sdev) 503 { 504 return sdev->sdev_state == SDEV_CREATED || 505 sdev->sdev_state == SDEV_CREATED_BLOCK; 506 } 507 508 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 509 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 510 enum scsi_device_state new_state); 511 512 /* accessor functions for the SCSI parameters */ 513 static inline int scsi_device_sync(struct scsi_device *sdev) 514 { 515 return sdev->sdtr; 516 } 517 static inline int scsi_device_wide(struct scsi_device *sdev) 518 { 519 return sdev->wdtr; 520 } 521 static inline int scsi_device_dt(struct scsi_device *sdev) 522 { 523 return sdev->ppr; 524 } 525 static inline int scsi_device_dt_only(struct scsi_device *sdev) 526 { 527 if (sdev->inquiry_len < 57) 528 return 0; 529 return (sdev->inquiry[56] & 0x0c) == 0x04; 530 } 531 static inline int scsi_device_ius(struct scsi_device *sdev) 532 { 533 if (sdev->inquiry_len < 57) 534 return 0; 535 return sdev->inquiry[56] & 0x01; 536 } 537 static inline int scsi_device_qas(struct scsi_device *sdev) 538 { 539 if (sdev->inquiry_len < 57) 540 return 0; 541 return sdev->inquiry[56] & 0x02; 542 } 543 static inline int scsi_device_enclosure(struct scsi_device *sdev) 544 { 545 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 546 } 547 548 static inline int scsi_device_protection(struct scsi_device *sdev) 549 { 550 if (sdev->no_dif) 551 return 0; 552 553 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 554 } 555 556 static inline int scsi_device_tpgs(struct scsi_device *sdev) 557 { 558 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 559 } 560 561 /** 562 * scsi_device_supports_vpd - test if a device supports VPD pages 563 * @sdev: the &struct scsi_device to test 564 * 565 * If the 'try_vpd_pages' flag is set it takes precedence. 566 * Otherwise we will assume VPD pages are supported if the 567 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 568 */ 569 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 570 { 571 /* Attempt VPD inquiry if the device blacklist explicitly calls 572 * for it. 573 */ 574 if (sdev->try_vpd_pages) 575 return 1; 576 /* 577 * Although VPD inquiries can go to SCSI-2 type devices, 578 * some USB ones crash on receiving them, and the pages 579 * we currently ask for are mandatory for SPC-2 and beyond 580 */ 581 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 582 return 1; 583 return 0; 584 } 585 586 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 587 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 588 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 589 590 #endif /* _SCSI_SCSI_DEVICE_H */ 591