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 #include <linux/sbitmap.h> 12 13 struct bsg_device; 14 struct device; 15 struct request_queue; 16 struct scsi_cmnd; 17 struct scsi_lun; 18 struct scsi_sense_hdr; 19 20 typedef __u64 __bitwise blist_flags_t; 21 22 #define SCSI_SENSE_BUFFERSIZE 96 23 24 struct scsi_mode_data { 25 __u32 length; 26 __u16 block_descriptor_length; 27 __u8 medium_type; 28 __u8 device_specific; 29 __u8 header_length; 30 __u8 longlba:1; 31 }; 32 33 /* 34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 35 * (for the ascii descriptions) and the state model enforcer: 36 * scsi_lib:scsi_device_set_state(). 37 */ 38 enum scsi_device_state { 39 SDEV_CREATED = 1, /* device created but not added to sysfs 40 * Only internal commands allowed (for inq) */ 41 SDEV_RUNNING, /* device properly configured 42 * All commands allowed */ 43 SDEV_CANCEL, /* beginning to delete device 44 * Only error handler commands allowed */ 45 SDEV_DEL, /* device deleted 46 * no commands allowed */ 47 SDEV_QUIESCE, /* Device quiescent. No block commands 48 * will be accepted, only specials (which 49 * originate in the mid-layer) */ 50 SDEV_OFFLINE, /* Device offlined (by error handling or 51 * user request */ 52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 53 SDEV_BLOCK, /* Device blocked by scsi lld. No 54 * scsi commands from user or midlayer 55 * should be issued to the scsi 56 * lld. */ 57 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 58 }; 59 60 enum scsi_scan_mode { 61 SCSI_SCAN_INITIAL = 0, 62 SCSI_SCAN_RESCAN, 63 SCSI_SCAN_MANUAL, 64 }; 65 66 enum scsi_device_event { 67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 75 76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 78 79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 80 }; 81 82 struct scsi_event { 83 enum scsi_device_event evt_type; 84 struct list_head node; 85 86 /* put union of data structures, for non-simple event types, 87 * here 88 */ 89 }; 90 91 /** 92 * struct scsi_vpd - SCSI Vital Product Data 93 * @rcu: For kfree_rcu(). 94 * @len: Length in bytes of @data. 95 * @data: VPD data as defined in various T10 SCSI standard documents. 96 */ 97 struct scsi_vpd { 98 struct rcu_head rcu; 99 int len; 100 unsigned char data[]; 101 }; 102 103 struct scsi_device { 104 struct Scsi_Host *host; 105 struct request_queue *request_queue; 106 107 /* the next two are protected by the host->host_lock */ 108 struct list_head siblings; /* list of all devices on this host */ 109 struct list_head same_target_siblings; /* just the devices sharing same target id */ 110 111 struct sbitmap budget_map; 112 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 113 114 atomic_t restarts; 115 spinlock_t list_lock; 116 struct list_head starved_entry; 117 unsigned short queue_depth; /* How deep of a queue we want */ 118 unsigned short max_queue_depth; /* max queue depth */ 119 unsigned short last_queue_full_depth; /* These two are used by */ 120 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 121 unsigned long last_queue_full_time; /* last queue full time */ 122 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 123 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 124 125 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 126 127 unsigned int id, channel; 128 u64 lun; 129 unsigned int manufacturer; /* Manufacturer of device, for using 130 * vendor-specific cmd's */ 131 unsigned sector_size; /* size in bytes */ 132 133 void *hostdata; /* available to low-level driver */ 134 unsigned char type; 135 char scsi_level; 136 char inq_periph_qual; /* PQ from INQUIRY data */ 137 struct mutex inquiry_mutex; 138 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 139 unsigned char * inquiry; /* INQUIRY response data */ 140 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 141 const char * model; /* ... after scan; point to static string */ 142 const char * rev; /* ... "nullnullnullnull" before scan */ 143 144 #define SCSI_VPD_PG_LEN 255 145 struct scsi_vpd __rcu *vpd_pg0; 146 struct scsi_vpd __rcu *vpd_pg83; 147 struct scsi_vpd __rcu *vpd_pg80; 148 struct scsi_vpd __rcu *vpd_pg89; 149 struct scsi_target *sdev_target; 150 151 blist_flags_t sdev_bflags; /* black/white flags as also found in 152 * scsi_devinfo.[hc]. For now used only to 153 * pass settings from slave_alloc to scsi 154 * core. */ 155 unsigned int eh_timeout; /* Error handling timeout */ 156 unsigned removable:1; 157 unsigned changed:1; /* Data invalid due to media change */ 158 unsigned busy:1; /* Used to prevent races */ 159 unsigned lockable:1; /* Able to prevent media removal */ 160 unsigned locked:1; /* Media removal disabled */ 161 unsigned borken:1; /* Tell the Seagate driver to be 162 * painfully slow on this device */ 163 unsigned disconnect:1; /* can disconnect */ 164 unsigned soft_reset:1; /* Uses soft reset option */ 165 unsigned sdtr:1; /* Device supports SDTR messages */ 166 unsigned wdtr:1; /* Device supports WDTR messages */ 167 unsigned ppr:1; /* Device supports PPR messages */ 168 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 169 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 170 unsigned was_reset:1; /* There was a bus reset on the bus for 171 * this device */ 172 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 173 * because we did a bus reset. */ 174 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 175 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 176 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 177 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 178 unsigned no_write_same:1; /* no WRITE SAME command */ 179 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 180 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 181 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 182 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 183 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 184 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 185 unsigned no_start_on_add:1; /* do not issue start on add */ 186 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 187 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 188 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 189 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 190 unsigned select_no_atn:1; 191 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 192 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 193 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 194 unsigned last_sector_bug:1; /* do not use multisector accesses on 195 SD_LAST_BUGGY_SECTORS */ 196 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 197 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 198 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 199 unsigned security_supported:1; /* Supports Security Protocols */ 200 unsigned is_visible:1; /* is the device visible in sysfs */ 201 unsigned wce_default_on:1; /* Cache is ON by default */ 202 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 203 unsigned broken_fua:1; /* Don't set FUA bit */ 204 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 205 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 206 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 207 * creation time */ 208 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 209 210 bool offline_already; /* Device offline message logged */ 211 212 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 213 214 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 215 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 216 struct list_head event_list; /* asserted events */ 217 struct work_struct event_work; 218 219 unsigned int max_device_blocked; /* what device_blocked counts down from */ 220 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 221 222 atomic_t iorequest_cnt; 223 atomic_t iodone_cnt; 224 atomic_t ioerr_cnt; 225 226 struct device sdev_gendev, 227 sdev_dev; 228 229 struct execute_work ew; /* used to get process context on put */ 230 struct work_struct requeue_work; 231 232 struct scsi_device_handler *handler; 233 void *handler_data; 234 235 size_t dma_drain_len; 236 void *dma_drain_buf; 237 238 unsigned int sg_timeout; 239 unsigned int sg_reserved_size; 240 241 struct bsg_device *bsg_dev; 242 unsigned char access_state; 243 struct mutex state_mutex; 244 enum scsi_device_state sdev_state; 245 struct task_struct *quiesced_by; 246 unsigned long sdev_data[]; 247 } __attribute__((aligned(sizeof(unsigned long)))); 248 249 #define to_scsi_device(d) \ 250 container_of(d, struct scsi_device, sdev_gendev) 251 #define class_to_sdev(d) \ 252 container_of(d, struct scsi_device, sdev_dev) 253 #define transport_class_to_sdev(class_dev) \ 254 to_scsi_device(class_dev->parent) 255 256 #define sdev_dbg(sdev, fmt, a...) \ 257 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 258 259 /* 260 * like scmd_printk, but the device name is passed in 261 * as a string pointer 262 */ 263 __printf(4, 5) void 264 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 265 const char *, ...); 266 267 #define sdev_printk(l, sdev, fmt, a...) \ 268 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 269 270 __printf(3, 4) void 271 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 272 273 #define scmd_dbg(scmd, fmt, a...) \ 274 do { \ 275 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 276 \ 277 if (__rq->rq_disk) \ 278 sdev_dbg((scmd)->device, "[%s] " fmt, \ 279 __rq->rq_disk->disk_name, ##a); \ 280 else \ 281 sdev_dbg((scmd)->device, fmt, ##a); \ 282 } while (0) 283 284 enum scsi_target_state { 285 STARGET_CREATED = 1, 286 STARGET_RUNNING, 287 STARGET_REMOVE, 288 STARGET_CREATED_REMOVE, 289 STARGET_DEL, 290 }; 291 292 /* 293 * scsi_target: representation of a scsi target, for now, this is only 294 * used for single_lun devices. If no one has active IO to the target, 295 * starget_sdev_user is NULL, else it points to the active sdev. 296 */ 297 struct scsi_target { 298 struct scsi_device *starget_sdev_user; 299 struct list_head siblings; 300 struct list_head devices; 301 struct device dev; 302 struct kref reap_ref; /* last put renders target invisible */ 303 unsigned int channel; 304 unsigned int id; /* target id ... replace 305 * scsi_device.id eventually */ 306 unsigned int create:1; /* signal that it needs to be added */ 307 unsigned int single_lun:1; /* Indicates we should only 308 * allow I/O to one of the luns 309 * for the device at a time. */ 310 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 311 * means no lun present. */ 312 unsigned int no_report_luns:1; /* Don't use 313 * REPORT LUNS for scanning. */ 314 unsigned int expecting_lun_change:1; /* A device has reported 315 * a 3F/0E UA, other devices on 316 * the same target will also. */ 317 /* commands actually active on LLD. */ 318 atomic_t target_busy; 319 atomic_t target_blocked; 320 321 /* 322 * LLDs should set this in the slave_alloc host template callout. 323 * If set to zero then there is not limit. 324 */ 325 unsigned int can_queue; 326 unsigned int max_target_blocked; 327 #define SCSI_DEFAULT_TARGET_BLOCKED 3 328 329 char scsi_level; 330 enum scsi_target_state state; 331 void *hostdata; /* available to low-level driver */ 332 unsigned long starget_data[]; /* for the transport */ 333 /* starget_data must be the last element!!!! */ 334 } __attribute__((aligned(sizeof(unsigned long)))); 335 336 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 337 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 338 { 339 return to_scsi_target(sdev->sdev_gendev.parent); 340 } 341 #define transport_class_to_starget(class_dev) \ 342 to_scsi_target(class_dev->parent) 343 344 #define starget_printk(prefix, starget, fmt, a...) \ 345 dev_printk(prefix, &(starget)->dev, fmt, ##a) 346 347 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 348 uint, uint, u64, void *hostdata); 349 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 350 uint target, u64 lun); 351 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 352 extern void scsi_remove_device(struct scsi_device *); 353 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 354 void scsi_attach_vpd(struct scsi_device *sdev); 355 356 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 357 extern int __must_check scsi_device_get(struct scsi_device *); 358 extern void scsi_device_put(struct scsi_device *); 359 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 360 uint, uint, u64); 361 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 362 uint, uint, u64); 363 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 364 u64); 365 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 366 u64); 367 extern void starget_for_each_device(struct scsi_target *, void *, 368 void (*fn)(struct scsi_device *, void *)); 369 extern void __starget_for_each_device(struct scsi_target *, void *, 370 void (*fn)(struct scsi_device *, 371 void *)); 372 373 /* only exposed to implement shost_for_each_device */ 374 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 375 struct scsi_device *); 376 377 /** 378 * shost_for_each_device - iterate over all devices of a host 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. This loop 383 * takes a reference on each device and releases it at the end. If 384 * you break out of the loop, you must call scsi_device_put(sdev). 385 */ 386 #define shost_for_each_device(sdev, shost) \ 387 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 388 (sdev); \ 389 (sdev) = __scsi_iterate_devices((shost), (sdev))) 390 391 /** 392 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 393 * @sdev: the &struct scsi_device to use as a cursor 394 * @shost: the &struct scsi_host to iterate over 395 * 396 * Iterator that returns each device attached to @shost. It does _not_ 397 * take a reference on the scsi_device, so the whole loop must be 398 * protected by shost->host_lock. 399 * 400 * Note: The only reason to use this is because you need to access the 401 * device list in interrupt context. Otherwise you really want to use 402 * shost_for_each_device instead. 403 */ 404 #define __shost_for_each_device(sdev, shost) \ 405 list_for_each_entry((sdev), &((shost)->__devices), siblings) 406 407 extern int scsi_change_queue_depth(struct scsi_device *, int); 408 extern int scsi_track_queue_full(struct scsi_device *, int); 409 410 extern int scsi_set_medium_removal(struct scsi_device *, char); 411 412 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 413 unsigned char *buffer, int len, int timeout, 414 int retries, struct scsi_mode_data *data, 415 struct scsi_sense_hdr *); 416 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 417 int modepage, unsigned char *buffer, int len, 418 int timeout, int retries, 419 struct scsi_mode_data *data, 420 struct scsi_sense_hdr *); 421 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 422 int retries, struct scsi_sense_hdr *sshdr); 423 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 424 int buf_len); 425 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 426 unsigned int len, unsigned char opcode); 427 extern int scsi_device_set_state(struct scsi_device *sdev, 428 enum scsi_device_state state); 429 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 430 gfp_t gfpflags); 431 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 432 extern void sdev_evt_send_simple(struct scsi_device *sdev, 433 enum scsi_device_event evt_type, gfp_t gfpflags); 434 extern int scsi_device_quiesce(struct scsi_device *sdev); 435 extern void scsi_device_resume(struct scsi_device *sdev); 436 extern void scsi_target_quiesce(struct scsi_target *); 437 extern void scsi_target_resume(struct scsi_target *); 438 extern void scsi_scan_target(struct device *parent, unsigned int channel, 439 unsigned int id, u64 lun, 440 enum scsi_scan_mode rescan); 441 extern void scsi_target_reap(struct scsi_target *); 442 extern void scsi_target_block(struct device *); 443 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 444 extern void scsi_remove_target(struct device *); 445 extern const char *scsi_device_state_name(enum scsi_device_state); 446 extern int scsi_is_sdev_device(const struct device *); 447 extern int scsi_is_target_device(const struct device *); 448 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 449 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 450 int data_direction, void *buffer, unsigned bufflen, 451 unsigned char *sense, struct scsi_sense_hdr *sshdr, 452 int timeout, int retries, u64 flags, 453 req_flags_t rq_flags, int *resid); 454 /* Make sure any sense buffer is the correct size. */ 455 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ 456 sshdr, timeout, retries, flags, rq_flags, resid) \ 457 ({ \ 458 BUILD_BUG_ON((sense) != NULL && \ 459 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ 460 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ 461 sense, sshdr, timeout, retries, flags, rq_flags, \ 462 resid); \ 463 }) 464 static inline int scsi_execute_req(struct scsi_device *sdev, 465 const unsigned char *cmd, int data_direction, void *buffer, 466 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 467 int retries, int *resid) 468 { 469 return scsi_execute(sdev, cmd, data_direction, buffer, 470 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 471 } 472 extern void sdev_disable_disk_events(struct scsi_device *sdev); 473 extern void sdev_enable_disk_events(struct scsi_device *sdev); 474 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 475 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 476 477 #ifdef CONFIG_PM 478 extern int scsi_autopm_get_device(struct scsi_device *); 479 extern void scsi_autopm_put_device(struct scsi_device *); 480 #else 481 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 482 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 483 #endif /* CONFIG_PM */ 484 485 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 486 { 487 return device_reprobe(&sdev->sdev_gendev); 488 } 489 490 static inline unsigned int sdev_channel(struct scsi_device *sdev) 491 { 492 return sdev->channel; 493 } 494 495 static inline unsigned int sdev_id(struct scsi_device *sdev) 496 { 497 return sdev->id; 498 } 499 500 #define scmd_id(scmd) sdev_id((scmd)->device) 501 #define scmd_channel(scmd) sdev_channel((scmd)->device) 502 503 /* 504 * checks for positions of the SCSI state machine 505 */ 506 static inline int scsi_device_online(struct scsi_device *sdev) 507 { 508 return (sdev->sdev_state != SDEV_OFFLINE && 509 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 510 sdev->sdev_state != SDEV_DEL); 511 } 512 static inline int scsi_device_blocked(struct scsi_device *sdev) 513 { 514 return sdev->sdev_state == SDEV_BLOCK || 515 sdev->sdev_state == SDEV_CREATED_BLOCK; 516 } 517 static inline int scsi_device_created(struct scsi_device *sdev) 518 { 519 return sdev->sdev_state == SDEV_CREATED || 520 sdev->sdev_state == SDEV_CREATED_BLOCK; 521 } 522 523 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 524 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 525 enum scsi_device_state new_state); 526 527 /* accessor functions for the SCSI parameters */ 528 static inline int scsi_device_sync(struct scsi_device *sdev) 529 { 530 return sdev->sdtr; 531 } 532 static inline int scsi_device_wide(struct scsi_device *sdev) 533 { 534 return sdev->wdtr; 535 } 536 static inline int scsi_device_dt(struct scsi_device *sdev) 537 { 538 return sdev->ppr; 539 } 540 static inline int scsi_device_dt_only(struct scsi_device *sdev) 541 { 542 if (sdev->inquiry_len < 57) 543 return 0; 544 return (sdev->inquiry[56] & 0x0c) == 0x04; 545 } 546 static inline int scsi_device_ius(struct scsi_device *sdev) 547 { 548 if (sdev->inquiry_len < 57) 549 return 0; 550 return sdev->inquiry[56] & 0x01; 551 } 552 static inline int scsi_device_qas(struct scsi_device *sdev) 553 { 554 if (sdev->inquiry_len < 57) 555 return 0; 556 return sdev->inquiry[56] & 0x02; 557 } 558 static inline int scsi_device_enclosure(struct scsi_device *sdev) 559 { 560 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 561 } 562 563 static inline int scsi_device_protection(struct scsi_device *sdev) 564 { 565 if (sdev->no_dif) 566 return 0; 567 568 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 569 } 570 571 static inline int scsi_device_tpgs(struct scsi_device *sdev) 572 { 573 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 574 } 575 576 /** 577 * scsi_device_supports_vpd - test if a device supports VPD pages 578 * @sdev: the &struct scsi_device to test 579 * 580 * If the 'try_vpd_pages' flag is set it takes precedence. 581 * Otherwise we will assume VPD pages are supported if the 582 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 583 */ 584 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 585 { 586 /* Attempt VPD inquiry if the device blacklist explicitly calls 587 * for it. 588 */ 589 if (sdev->try_vpd_pages) 590 return 1; 591 /* 592 * Although VPD inquiries can go to SCSI-2 type devices, 593 * some USB ones crash on receiving them, and the pages 594 * we currently ask for are mandatory for SPC-2 and beyond 595 */ 596 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 597 return 1; 598 return 0; 599 } 600 601 static inline int scsi_device_busy(struct scsi_device *sdev) 602 { 603 return sbitmap_weight(&sdev->budget_map); 604 } 605 606 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 607 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 608 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 609 610 #endif /* _SCSI_SCSI_DEVICE_H */ 611