scsi_device.h (22192B)
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/blk-mq.h> 9#include <scsi/scsi.h> 10#include <linux/atomic.h> 11#include <linux/sbitmap.h> 12 13struct bsg_device; 14struct device; 15struct request_queue; 16struct scsi_cmnd; 17struct scsi_lun; 18struct scsi_sense_hdr; 19 20typedef __u64 __bitwise blist_flags_t; 21 22#define SCSI_SENSE_BUFFERSIZE 96 23 24struct 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 */ 38enum 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 60enum scsi_scan_mode { 61 SCSI_SCAN_INITIAL = 0, 62 SCSI_SCAN_RESCAN, 63 SCSI_SCAN_MANUAL, 64}; 65 66enum 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 82struct 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 */ 97struct scsi_vpd { 98 struct rcu_head rcu; 99 int len; 100 unsigned char data[]; 101}; 102 103enum scsi_vpd_parameters { 104 SCSI_VPD_HEADER_SIZE = 4, 105}; 106 107struct scsi_device { 108 struct Scsi_Host *host; 109 struct request_queue *request_queue; 110 111 /* the next two are protected by the host->host_lock */ 112 struct list_head siblings; /* list of all devices on this host */ 113 struct list_head same_target_siblings; /* just the devices sharing same target id */ 114 115 struct sbitmap budget_map; 116 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 117 118 atomic_t restarts; 119 spinlock_t list_lock; 120 struct list_head starved_entry; 121 unsigned short queue_depth; /* How deep of a queue we want */ 122 unsigned short max_queue_depth; /* max queue depth */ 123 unsigned short last_queue_full_depth; /* These two are used by */ 124 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 125 unsigned long last_queue_full_time; /* last queue full time */ 126 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 127#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 128 129 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 130 131 unsigned int id, channel; 132 u64 lun; 133 unsigned int manufacturer; /* Manufacturer of device, for using 134 * vendor-specific cmd's */ 135 unsigned sector_size; /* size in bytes */ 136 137 void *hostdata; /* available to low-level driver */ 138 unsigned char type; 139 char scsi_level; 140 char inq_periph_qual; /* PQ from INQUIRY data */ 141 struct mutex inquiry_mutex; 142 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 143 unsigned char * inquiry; /* INQUIRY response data */ 144 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 145 const char * model; /* ... after scan; point to static string */ 146 const char * rev; /* ... "nullnullnullnull" before scan */ 147 148 struct scsi_vpd __rcu *vpd_pg0; 149 struct scsi_vpd __rcu *vpd_pg83; 150 struct scsi_vpd __rcu *vpd_pg80; 151 struct scsi_vpd __rcu *vpd_pg89; 152 struct scsi_vpd __rcu *vpd_pgb0; 153 struct scsi_vpd __rcu *vpd_pgb1; 154 struct scsi_vpd __rcu *vpd_pgb2; 155 156 struct scsi_target *sdev_target; 157 158 blist_flags_t sdev_bflags; /* black/white flags as also found in 159 * scsi_devinfo.[hc]. For now used only to 160 * pass settings from slave_alloc to scsi 161 * core. */ 162 unsigned int eh_timeout; /* Error handling timeout */ 163 unsigned removable:1; 164 unsigned changed:1; /* Data invalid due to media change */ 165 unsigned busy:1; /* Used to prevent races */ 166 unsigned lockable:1; /* Able to prevent media removal */ 167 unsigned locked:1; /* Media removal disabled */ 168 unsigned borken:1; /* Tell the Seagate driver to be 169 * painfully slow on this device */ 170 unsigned disconnect:1; /* can disconnect */ 171 unsigned soft_reset:1; /* Uses soft reset option */ 172 unsigned sdtr:1; /* Device supports SDTR messages */ 173 unsigned wdtr:1; /* Device supports WDTR messages */ 174 unsigned ppr:1; /* Device supports PPR messages */ 175 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 176 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 177 unsigned was_reset:1; /* There was a bus reset on the bus for 178 * this device */ 179 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 180 * because we did a bus reset. */ 181 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 182 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 183 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 184 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 185 unsigned no_write_same:1; /* no WRITE SAME command */ 186 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 187 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 188 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 189 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 190 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 191 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 192 unsigned no_start_on_add:1; /* do not issue start on add */ 193 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 194 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 195 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 196 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 197 unsigned select_no_atn:1; 198 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 199 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 200 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 201 unsigned last_sector_bug:1; /* do not use multisector accesses on 202 SD_LAST_BUGGY_SECTORS */ 203 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 204 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 205 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 206 unsigned security_supported:1; /* Supports Security Protocols */ 207 unsigned is_visible:1; /* is the device visible in sysfs */ 208 unsigned wce_default_on:1; /* Cache is ON by default */ 209 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 210 unsigned broken_fua:1; /* Don't set FUA bit */ 211 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 212 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 213 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 214 * creation time */ 215 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 216 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 217 218 unsigned int queue_stopped; /* request queue is quiesced */ 219 bool offline_already; /* Device offline message logged */ 220 221 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 222 223 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 224 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 225 struct list_head event_list; /* asserted events */ 226 struct work_struct event_work; 227 228 unsigned int max_device_blocked; /* what device_blocked counts down from */ 229#define SCSI_DEFAULT_DEVICE_BLOCKED 3 230 231 atomic_t iorequest_cnt; 232 atomic_t iodone_cnt; 233 atomic_t ioerr_cnt; 234 235 struct device sdev_gendev, 236 sdev_dev; 237 238 struct execute_work ew; /* used to get process context on put */ 239 struct work_struct requeue_work; 240 241 struct scsi_device_handler *handler; 242 void *handler_data; 243 244 size_t dma_drain_len; 245 void *dma_drain_buf; 246 247 unsigned int sg_timeout; 248 unsigned int sg_reserved_size; 249 250 struct bsg_device *bsg_dev; 251 unsigned char access_state; 252 struct mutex state_mutex; 253 enum scsi_device_state sdev_state; 254 struct task_struct *quiesced_by; 255 unsigned long sdev_data[]; 256} __attribute__((aligned(sizeof(unsigned long)))); 257 258#define to_scsi_device(d) \ 259 container_of(d, struct scsi_device, sdev_gendev) 260#define class_to_sdev(d) \ 261 container_of(d, struct scsi_device, sdev_dev) 262#define transport_class_to_sdev(class_dev) \ 263 to_scsi_device(class_dev->parent) 264 265#define sdev_dbg(sdev, fmt, a...) \ 266 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 267 268/* 269 * like scmd_printk, but the device name is passed in 270 * as a string pointer 271 */ 272__printf(4, 5) void 273sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 274 const char *, ...); 275 276#define sdev_printk(l, sdev, fmt, a...) \ 277 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 278 279__printf(3, 4) void 280scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 281 282#define scmd_dbg(scmd, fmt, a...) \ 283 do { \ 284 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 285 \ 286 if (__rq->q->disk) \ 287 sdev_dbg((scmd)->device, "[%s] " fmt, \ 288 __rq->q->disk->disk_name, ##a); \ 289 else \ 290 sdev_dbg((scmd)->device, fmt, ##a); \ 291 } while (0) 292 293enum scsi_target_state { 294 STARGET_CREATED = 1, 295 STARGET_RUNNING, 296 STARGET_REMOVE, 297 STARGET_CREATED_REMOVE, 298 STARGET_DEL, 299}; 300 301/* 302 * scsi_target: representation of a scsi target, for now, this is only 303 * used for single_lun devices. If no one has active IO to the target, 304 * starget_sdev_user is NULL, else it points to the active sdev. 305 */ 306struct scsi_target { 307 struct scsi_device *starget_sdev_user; 308 struct list_head siblings; 309 struct list_head devices; 310 struct device dev; 311 struct kref reap_ref; /* last put renders target invisible */ 312 unsigned int channel; 313 unsigned int id; /* target id ... replace 314 * scsi_device.id eventually */ 315 unsigned int create:1; /* signal that it needs to be added */ 316 unsigned int single_lun:1; /* Indicates we should only 317 * allow I/O to one of the luns 318 * for the device at a time. */ 319 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 320 * means no lun present. */ 321 unsigned int no_report_luns:1; /* Don't use 322 * REPORT LUNS for scanning. */ 323 unsigned int expecting_lun_change:1; /* A device has reported 324 * a 3F/0E UA, other devices on 325 * the same target will also. */ 326 /* commands actually active on LLD. */ 327 atomic_t target_busy; 328 atomic_t target_blocked; 329 330 /* 331 * LLDs should set this in the slave_alloc host template callout. 332 * If set to zero then there is not limit. 333 */ 334 unsigned int can_queue; 335 unsigned int max_target_blocked; 336#define SCSI_DEFAULT_TARGET_BLOCKED 3 337 338 char scsi_level; 339 enum scsi_target_state state; 340 void *hostdata; /* available to low-level driver */ 341 unsigned long starget_data[]; /* for the transport */ 342 /* starget_data must be the last element!!!! */ 343} __attribute__((aligned(sizeof(unsigned long)))); 344 345#define to_scsi_target(d) container_of(d, struct scsi_target, dev) 346static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 347{ 348 return to_scsi_target(sdev->sdev_gendev.parent); 349} 350#define transport_class_to_starget(class_dev) \ 351 to_scsi_target(class_dev->parent) 352 353#define starget_printk(prefix, starget, fmt, a...) \ 354 dev_printk(prefix, &(starget)->dev, fmt, ##a) 355 356extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 357 uint, uint, u64, void *hostdata); 358extern int scsi_add_device(struct Scsi_Host *host, uint channel, 359 uint target, u64 lun); 360extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 361extern void scsi_remove_device(struct scsi_device *); 362extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 363void scsi_attach_vpd(struct scsi_device *sdev); 364 365extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 366extern int __must_check scsi_device_get(struct scsi_device *); 367extern void scsi_device_put(struct scsi_device *); 368extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 369 uint, uint, u64); 370extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 371 uint, uint, u64); 372extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 373 u64); 374extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 375 u64); 376extern void starget_for_each_device(struct scsi_target *, void *, 377 void (*fn)(struct scsi_device *, void *)); 378extern void __starget_for_each_device(struct scsi_target *, void *, 379 void (*fn)(struct scsi_device *, 380 void *)); 381 382/* only exposed to implement shost_for_each_device */ 383extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 384 struct scsi_device *); 385 386/** 387 * shost_for_each_device - iterate over all devices of a host 388 * @sdev: the &struct scsi_device to use as a cursor 389 * @shost: the &struct scsi_host to iterate over 390 * 391 * Iterator that returns each device attached to @shost. This loop 392 * takes a reference on each device and releases it at the end. If 393 * you break out of the loop, you must call scsi_device_put(sdev). 394 */ 395#define shost_for_each_device(sdev, shost) \ 396 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 397 (sdev); \ 398 (sdev) = __scsi_iterate_devices((shost), (sdev))) 399 400/** 401 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 402 * @sdev: the &struct scsi_device to use as a cursor 403 * @shost: the &struct scsi_host to iterate over 404 * 405 * Iterator that returns each device attached to @shost. It does _not_ 406 * take a reference on the scsi_device, so the whole loop must be 407 * protected by shost->host_lock. 408 * 409 * Note: The only reason to use this is because you need to access the 410 * device list in interrupt context. Otherwise you really want to use 411 * shost_for_each_device instead. 412 */ 413#define __shost_for_each_device(sdev, shost) \ 414 list_for_each_entry((sdev), &((shost)->__devices), siblings) 415 416extern int scsi_change_queue_depth(struct scsi_device *, int); 417extern int scsi_track_queue_full(struct scsi_device *, int); 418 419extern int scsi_set_medium_removal(struct scsi_device *, char); 420 421extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 422 unsigned char *buffer, int len, int timeout, 423 int retries, struct scsi_mode_data *data, 424 struct scsi_sense_hdr *); 425extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 426 unsigned char *buffer, int len, int timeout, 427 int retries, struct scsi_mode_data *data, 428 struct scsi_sense_hdr *); 429extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 430 int retries, struct scsi_sense_hdr *sshdr); 431extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 432 int buf_len); 433extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 434 unsigned int len, unsigned char opcode); 435extern int scsi_device_set_state(struct scsi_device *sdev, 436 enum scsi_device_state state); 437extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 438 gfp_t gfpflags); 439extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 440extern void sdev_evt_send_simple(struct scsi_device *sdev, 441 enum scsi_device_event evt_type, gfp_t gfpflags); 442extern int scsi_device_quiesce(struct scsi_device *sdev); 443extern void scsi_device_resume(struct scsi_device *sdev); 444extern void scsi_target_quiesce(struct scsi_target *); 445extern void scsi_target_resume(struct scsi_target *); 446extern void scsi_scan_target(struct device *parent, unsigned int channel, 447 unsigned int id, u64 lun, 448 enum scsi_scan_mode rescan); 449extern void scsi_target_reap(struct scsi_target *); 450extern void scsi_target_block(struct device *); 451extern void scsi_target_unblock(struct device *, enum scsi_device_state); 452extern void scsi_remove_target(struct device *); 453extern const char *scsi_device_state_name(enum scsi_device_state); 454extern int scsi_is_sdev_device(const struct device *); 455extern int scsi_is_target_device(const struct device *); 456extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 457extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 458 int data_direction, void *buffer, unsigned bufflen, 459 unsigned char *sense, struct scsi_sense_hdr *sshdr, 460 int timeout, int retries, u64 flags, 461 req_flags_t rq_flags, int *resid); 462/* Make sure any sense buffer is the correct size. */ 463#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ 464 sshdr, timeout, retries, flags, rq_flags, resid) \ 465({ \ 466 BUILD_BUG_ON((sense) != NULL && \ 467 sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ 468 __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ 469 sense, sshdr, timeout, retries, flags, rq_flags, \ 470 resid); \ 471}) 472static inline int scsi_execute_req(struct scsi_device *sdev, 473 const unsigned char *cmd, int data_direction, void *buffer, 474 unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, 475 int retries, int *resid) 476{ 477 return scsi_execute(sdev, cmd, data_direction, buffer, 478 bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); 479} 480extern void sdev_disable_disk_events(struct scsi_device *sdev); 481extern void sdev_enable_disk_events(struct scsi_device *sdev); 482extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 483extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 484 485#ifdef CONFIG_PM 486extern int scsi_autopm_get_device(struct scsi_device *); 487extern void scsi_autopm_put_device(struct scsi_device *); 488#else 489static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } 490static inline void scsi_autopm_put_device(struct scsi_device *d) {} 491#endif /* CONFIG_PM */ 492 493static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 494{ 495 return device_reprobe(&sdev->sdev_gendev); 496} 497 498static inline unsigned int sdev_channel(struct scsi_device *sdev) 499{ 500 return sdev->channel; 501} 502 503static inline unsigned int sdev_id(struct scsi_device *sdev) 504{ 505 return sdev->id; 506} 507 508#define scmd_id(scmd) sdev_id((scmd)->device) 509#define scmd_channel(scmd) sdev_channel((scmd)->device) 510 511/* 512 * checks for positions of the SCSI state machine 513 */ 514static inline int scsi_device_online(struct scsi_device *sdev) 515{ 516 return (sdev->sdev_state != SDEV_OFFLINE && 517 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 518 sdev->sdev_state != SDEV_DEL); 519} 520static inline int scsi_device_blocked(struct scsi_device *sdev) 521{ 522 return sdev->sdev_state == SDEV_BLOCK || 523 sdev->sdev_state == SDEV_CREATED_BLOCK; 524} 525static inline int scsi_device_created(struct scsi_device *sdev) 526{ 527 return sdev->sdev_state == SDEV_CREATED || 528 sdev->sdev_state == SDEV_CREATED_BLOCK; 529} 530 531int scsi_internal_device_block_nowait(struct scsi_device *sdev); 532int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 533 enum scsi_device_state new_state); 534 535/* accessor functions for the SCSI parameters */ 536static inline int scsi_device_sync(struct scsi_device *sdev) 537{ 538 return sdev->sdtr; 539} 540static inline int scsi_device_wide(struct scsi_device *sdev) 541{ 542 return sdev->wdtr; 543} 544static inline int scsi_device_dt(struct scsi_device *sdev) 545{ 546 return sdev->ppr; 547} 548static inline int scsi_device_dt_only(struct scsi_device *sdev) 549{ 550 if (sdev->inquiry_len < 57) 551 return 0; 552 return (sdev->inquiry[56] & 0x0c) == 0x04; 553} 554static inline int scsi_device_ius(struct scsi_device *sdev) 555{ 556 if (sdev->inquiry_len < 57) 557 return 0; 558 return sdev->inquiry[56] & 0x01; 559} 560static inline int scsi_device_qas(struct scsi_device *sdev) 561{ 562 if (sdev->inquiry_len < 57) 563 return 0; 564 return sdev->inquiry[56] & 0x02; 565} 566static inline int scsi_device_enclosure(struct scsi_device *sdev) 567{ 568 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 569} 570 571static inline int scsi_device_protection(struct scsi_device *sdev) 572{ 573 if (sdev->no_dif) 574 return 0; 575 576 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 577} 578 579static inline int scsi_device_tpgs(struct scsi_device *sdev) 580{ 581 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 582} 583 584/** 585 * scsi_device_supports_vpd - test if a device supports VPD pages 586 * @sdev: the &struct scsi_device to test 587 * 588 * If the 'try_vpd_pages' flag is set it takes precedence. 589 * Otherwise we will assume VPD pages are supported if the 590 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 591 */ 592static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 593{ 594 /* Attempt VPD inquiry if the device blacklist explicitly calls 595 * for it. 596 */ 597 if (sdev->try_vpd_pages) 598 return 1; 599 /* 600 * Although VPD inquiries can go to SCSI-2 type devices, 601 * some USB ones crash on receiving them, and the pages 602 * we currently ask for are mandatory for SPC-2 and beyond 603 */ 604 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 605 return 1; 606 return 0; 607} 608 609static inline int scsi_device_busy(struct scsi_device *sdev) 610{ 611 return sbitmap_weight(&sdev->budget_map); 612} 613 614#define MODULE_ALIAS_SCSI_DEVICE(type) \ 615 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 616#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 617 618#endif /* _SCSI_SCSI_DEVICE_H */