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 set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 176 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 177 unsigned no_write_same:1; /* no WRITE SAME command */ 178 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 179 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 180 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 181 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 182 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 183 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 184 unsigned no_start_on_add:1; /* do not issue start on add */ 185 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 186 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 187 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 188 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 189 unsigned select_no_atn:1; 190 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 191 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 192 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 193 unsigned last_sector_bug:1; /* do not use multisector accesses on 194 SD_LAST_BUGGY_SECTORS */ 195 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 196 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 197 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 198 unsigned security_supported:1; /* Supports Security Protocols */ 199 unsigned is_visible:1; /* is the device visible in sysfs */ 200 unsigned wce_default_on:1; /* Cache is ON by default */ 201 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 202 unsigned broken_fua:1; /* Don't set FUA bit */ 203 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 204 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 205 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 206 * creation time */ 207 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 208 209 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 210 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 211 struct list_head event_list; /* asserted events */ 212 struct work_struct event_work; 213 214 unsigned int max_device_blocked; /* what device_blocked counts down from */ 215 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 216 217 atomic_t iorequest_cnt; 218 atomic_t iodone_cnt; 219 atomic_t ioerr_cnt; 220 221 struct device sdev_gendev, 222 sdev_dev; 223 224 struct execute_work ew; /* used to get process context on put */ 225 struct work_struct requeue_work; 226 227 struct scsi_device_handler *handler; 228 void *handler_data; 229 230 unsigned char access_state; 231 struct mutex state_mutex; 232 enum scsi_device_state sdev_state; 233 struct task_struct *quiesced_by; 234 unsigned long sdev_data[0]; 235 } __attribute__((aligned(sizeof(unsigned long)))); 236 237 #define to_scsi_device(d) \ 238 container_of(d, struct scsi_device, sdev_gendev) 239 #define class_to_sdev(d) \ 240 container_of(d, struct scsi_device, sdev_dev) 241 #define transport_class_to_sdev(class_dev) \ 242 to_scsi_device(class_dev->parent) 243 244 #define sdev_dbg(sdev, fmt, a...) \ 245 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 246 247 /* 248 * like scmd_printk, but the device name is passed in 249 * as a string pointer 250 */ 251 __printf(4, 5) void 252 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 253 const char *, ...); 254 255 #define sdev_printk(l, sdev, fmt, a...) \ 256 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 257 258 __printf(3, 4) void 259 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 260 261 #define scmd_dbg(scmd, fmt, a...) \ 262 do { \ 263 if ((scmd)->request->rq_disk) \ 264 sdev_dbg((scmd)->device, "[%s] " fmt, \ 265 (scmd)->request->rq_disk->disk_name, ##a);\ 266 else \ 267 sdev_dbg((scmd)->device, fmt, ##a); \ 268 } while (0) 269 270 enum scsi_target_state { 271 STARGET_CREATED = 1, 272 STARGET_RUNNING, 273 STARGET_REMOVE, 274 STARGET_CREATED_REMOVE, 275 STARGET_DEL, 276 }; 277 278 /* 279 * scsi_target: representation of a scsi target, for now, this is only 280 * used for single_lun devices. If no one has active IO to the target, 281 * starget_sdev_user is NULL, else it points to the active sdev. 282 */ 283 struct scsi_target { 284 struct scsi_device *starget_sdev_user; 285 struct list_head siblings; 286 struct list_head devices; 287 struct device dev; 288 struct kref reap_ref; /* last put renders target invisible */ 289 unsigned int channel; 290 unsigned int id; /* target id ... replace 291 * scsi_device.id eventually */ 292 unsigned int create:1; /* signal that it needs to be added */ 293 unsigned int single_lun:1; /* Indicates we should only 294 * allow I/O to one of the luns 295 * for the device at a time. */ 296 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 297 * means no lun present. */ 298 unsigned int no_report_luns:1; /* Don't use 299 * REPORT LUNS for scanning. */ 300 unsigned int expecting_lun_change:1; /* A device has reported 301 * a 3F/0E UA, other devices on 302 * the same target will also. */ 303 /* commands actually active on LLD. */ 304 atomic_t target_busy; 305 atomic_t target_blocked; 306 307 /* 308 * LLDs should set this in the slave_alloc host template callout. 309 * If set to zero then there is not limit. 310 */ 311 unsigned int can_queue; 312 unsigned int max_target_blocked; 313 #define SCSI_DEFAULT_TARGET_BLOCKED 3 314 315 char scsi_level; 316 enum scsi_target_state state; 317 void *hostdata; /* available to low-level driver */ 318 unsigned long starget_data[0]; /* for the transport */ 319 /* starget_data must be the last element!!!! */ 320 } __attribute__((aligned(sizeof(unsigned long)))); 321 322 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 323 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 324 { 325 return to_scsi_target(sdev->sdev_gendev.parent); 326 } 327 #define transport_class_to_starget(class_dev) \ 328 to_scsi_target(class_dev->parent) 329 330 #define starget_printk(prefix, starget, fmt, a...) \ 331 dev_printk(prefix, &(starget)->dev, fmt, ##a) 332 333 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 334 uint, uint, u64, void *hostdata); 335 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 336 uint target, u64 lun); 337 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 338 extern void scsi_remove_device(struct scsi_device *); 339 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 340 void scsi_attach_vpd(struct scsi_device *sdev); 341 342 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 343 extern int __must_check scsi_device_get(struct scsi_device *); 344 extern void scsi_device_put(struct scsi_device *); 345 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 346 uint, uint, u64); 347 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 348 uint, uint, u64); 349 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 350 u64); 351 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 352 u64); 353 extern void starget_for_each_device(struct scsi_target *, void *, 354 void (*fn)(struct scsi_device *, void *)); 355 extern void __starget_for_each_device(struct scsi_target *, void *, 356 void (*fn)(struct scsi_device *, 357 void *)); 358 359 /* only exposed to implement shost_for_each_device */ 360 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 361 struct scsi_device *); 362 363 /** 364 * shost_for_each_device - iterate over all devices of a host 365 * @sdev: the &struct scsi_device to use as a cursor 366 * @shost: the &struct scsi_host to iterate over 367 * 368 * Iterator that returns each device attached to @shost. This loop 369 * takes a reference on each device and releases it at the end. If 370 * you break out of the loop, you must call scsi_device_put(sdev). 371 */ 372 #define shost_for_each_device(sdev, shost) \ 373 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 374 (sdev); \ 375 (sdev) = __scsi_iterate_devices((shost), (sdev))) 376 377 /** 378 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 379 * @sdev: the &struct scsi_device to use as a cursor 380 * @shost: the &struct scsi_host to iterate over 381 * 382 * Iterator that returns each device attached to @shost. It does _not_ 383 * take a reference on the scsi_device, so the whole loop must be 384 * protected by shost->host_lock. 385 * 386 * Note: The only reason to use this is because you need to access the 387 * device list in interrupt context. Otherwise you really want to use 388 * shost_for_each_device instead. 389 */ 390 #define __shost_for_each_device(sdev, shost) \ 391 list_for_each_entry((sdev), &((shost)->__devices), siblings) 392 393 extern int scsi_change_queue_depth(struct scsi_device *, int); 394 extern int scsi_track_queue_full(struct scsi_device *, int); 395 396 extern int scsi_set_medium_removal(struct scsi_device *, char); 397 398 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 399 unsigned char *buffer, int len, int timeout, 400 int retries, struct scsi_mode_data *data, 401 struct scsi_sense_hdr *); 402 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 403 int modepage, unsigned char *buffer, int len, 404 int timeout, int retries, 405 struct scsi_mode_data *data, 406 struct scsi_sense_hdr *); 407 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 408 int retries, struct scsi_sense_hdr *sshdr); 409 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 410 int buf_len); 411 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 412 unsigned int len, unsigned char opcode); 413 extern int scsi_device_set_state(struct scsi_device *sdev, 414 enum scsi_device_state state); 415 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 416 gfp_t gfpflags); 417 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 418 extern void sdev_evt_send_simple(struct scsi_device *sdev, 419 enum scsi_device_event evt_type, gfp_t gfpflags); 420 extern int scsi_device_quiesce(struct scsi_device *sdev); 421 extern void scsi_device_resume(struct scsi_device *sdev); 422 extern void scsi_target_quiesce(struct scsi_target *); 423 extern void scsi_target_resume(struct scsi_target *); 424 extern void scsi_scan_target(struct device *parent, unsigned int channel, 425 unsigned int id, u64 lun, 426 enum scsi_scan_mode rescan); 427 extern void scsi_target_reap(struct scsi_target *); 428 extern void scsi_target_block(struct device *); 429 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 430 extern void scsi_remove_target(struct device *); 431 extern const char *scsi_device_state_name(enum scsi_device_state); 432 extern int scsi_is_sdev_device(const struct device *); 433 extern int scsi_is_target_device(const struct device *); 434 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 435 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 436 int data_direction, void *buffer, unsigned bufflen, 437 unsigned char *sense, struct scsi_sense_hdr *sshdr, 438 int timeout, int retries, u64 flags, 439 req_flags_t rq_flags, int *resid); 440 /* Make sure any sense buffer is the correct size. */ 441 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ 442 sshdr, timeout, retries, flags, rq_flags, resid) \ 443 ({ \ 444 BUILD_BUG_ON((sense) != NULL && \ 445 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ 446 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ 447 sense, sshdr, timeout, retries, flags, rq_flags, \ 448 resid); \ 449 }) 450 static inline int scsi_execute_req(struct scsi_device *sdev, 451 const unsigned char *cmd, int data_direction, void *buffer, 452 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 453 int retries, int *resid) 454 { 455 return scsi_execute(sdev, cmd, data_direction, buffer, 456 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 457 } 458 extern void sdev_disable_disk_events(struct scsi_device *sdev); 459 extern void sdev_enable_disk_events(struct scsi_device *sdev); 460 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 461 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 462 463 #ifdef CONFIG_PM 464 extern int scsi_autopm_get_device(struct scsi_device *); 465 extern void scsi_autopm_put_device(struct scsi_device *); 466 #else 467 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 468 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 469 #endif /* CONFIG_PM */ 470 471 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 472 { 473 return device_reprobe(&sdev->sdev_gendev); 474 } 475 476 static inline unsigned int sdev_channel(struct scsi_device *sdev) 477 { 478 return sdev->channel; 479 } 480 481 static inline unsigned int sdev_id(struct scsi_device *sdev) 482 { 483 return sdev->id; 484 } 485 486 #define scmd_id(scmd) sdev_id((scmd)->device) 487 #define scmd_channel(scmd) sdev_channel((scmd)->device) 488 489 /* 490 * checks for positions of the SCSI state machine 491 */ 492 static inline int scsi_device_online(struct scsi_device *sdev) 493 { 494 return (sdev->sdev_state != SDEV_OFFLINE && 495 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 496 sdev->sdev_state != SDEV_DEL); 497 } 498 static inline int scsi_device_blocked(struct scsi_device *sdev) 499 { 500 return sdev->sdev_state == SDEV_BLOCK || 501 sdev->sdev_state == SDEV_CREATED_BLOCK; 502 } 503 static inline int scsi_device_created(struct scsi_device *sdev) 504 { 505 return sdev->sdev_state == SDEV_CREATED || 506 sdev->sdev_state == SDEV_CREATED_BLOCK; 507 } 508 509 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 510 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 511 enum scsi_device_state new_state); 512 513 /* accessor functions for the SCSI parameters */ 514 static inline int scsi_device_sync(struct scsi_device *sdev) 515 { 516 return sdev->sdtr; 517 } 518 static inline int scsi_device_wide(struct scsi_device *sdev) 519 { 520 return sdev->wdtr; 521 } 522 static inline int scsi_device_dt(struct scsi_device *sdev) 523 { 524 return sdev->ppr; 525 } 526 static inline int scsi_device_dt_only(struct scsi_device *sdev) 527 { 528 if (sdev->inquiry_len < 57) 529 return 0; 530 return (sdev->inquiry[56] & 0x0c) == 0x04; 531 } 532 static inline int scsi_device_ius(struct scsi_device *sdev) 533 { 534 if (sdev->inquiry_len < 57) 535 return 0; 536 return sdev->inquiry[56] & 0x01; 537 } 538 static inline int scsi_device_qas(struct scsi_device *sdev) 539 { 540 if (sdev->inquiry_len < 57) 541 return 0; 542 return sdev->inquiry[56] & 0x02; 543 } 544 static inline int scsi_device_enclosure(struct scsi_device *sdev) 545 { 546 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 547 } 548 549 static inline int scsi_device_protection(struct scsi_device *sdev) 550 { 551 if (sdev->no_dif) 552 return 0; 553 554 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 555 } 556 557 static inline int scsi_device_tpgs(struct scsi_device *sdev) 558 { 559 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 560 } 561 562 /** 563 * scsi_device_supports_vpd - test if a device supports VPD pages 564 * @sdev: the &struct scsi_device to test 565 * 566 * If the 'try_vpd_pages' flag is set it takes precedence. 567 * Otherwise we will assume VPD pages are supported if the 568 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 569 */ 570 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 571 { 572 /* Attempt VPD inquiry if the device blacklist explicitly calls 573 * for it. 574 */ 575 if (sdev->try_vpd_pages) 576 return 1; 577 /* 578 * Although VPD inquiries can go to SCSI-2 type devices, 579 * some USB ones crash on receiving them, and the pages 580 * we currently ask for are mandatory for SPC-2 and beyond 581 */ 582 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 583 return 1; 584 return 0; 585 } 586 587 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 588 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 589 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 590 591 #endif /* _SCSI_SCSI_DEVICE_H */ 592