include/scsi/scsi_device.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SCSI_SCSI_DEVICE_H
   3 #define _SCSI_SCSI_DEVICE_H
   4
   5 #include <linux/list.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/blkdev.h>
   9 #include <scsi/scsi.h>
  10 #include <linux/atomic.h>
  11
  12 struct device;
  13 struct request_queue;
  14 struct scsi_cmnd;
  15 struct scsi_lun;
  16 struct scsi_sense_hdr;
  17
  18 typedef unsigned int __bitwise blist_flags_t;
  19
  20 struct scsi_mode_data {
  21         __u32   length;
  22         __u16   block_descriptor_length;
  23         __u8    medium_type;
  24         __u8    device_specific;
  25         __u8    header_length;
  26         __u8    longlba:1;
  27 };
  28
  29 /*
  30  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  31  * (for the ascii descriptions) and the state model enforcer:
  32  * scsi_lib:scsi_device_set_state().
  33  */
  34 enum scsi_device_state {
  35         SDEV_CREATED = 1,       /* device created but not added to sysfs
  36                                  * Only internal commands allowed (for inq) */
  37         SDEV_RUNNING,           /* device properly configured
  38                                  * All commands allowed */
  39         SDEV_CANCEL,            /* beginning to delete device
  40                                  * Only error handler commands allowed */
  41         SDEV_DEL,               /* device deleted
  42                                  * no commands allowed */
  43         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  44                                  * will be accepted, only specials (which
  45                                  * originate in the mid-layer) */
  46         SDEV_OFFLINE,           /* Device offlined (by error handling or
  47                                  * user request */
  48         SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  49         SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  50                                  * scsi commands from user or midlayer
  51                                  * should be issued to the scsi
  52                                  * lld. */
  53         SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  54 };
  55
  56 enum scsi_scan_mode {
  57         SCSI_SCAN_INITIAL = 0,
  58         SCSI_SCAN_RESCAN,
  59         SCSI_SCAN_MANUAL,
  60 };
  61
  62 enum scsi_device_event {
  63         SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  64         SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  65         SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  66         SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  67         SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  68         SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  69         SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  70         SDEV_EVT_POWER_ON_RESET_OCCURRED,               /* 29 00  UA reported */
  71
  72         SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  73         SDEV_EVT_LAST           = SDEV_EVT_POWER_ON_RESET_OCCURRED,
  74
  75         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  76 };
  77
  78 struct scsi_event {
  79         enum scsi_device_event  evt_type;
  80         struct list_head        node;
  81
  82         /* put union of data structures, for non-simple event types,
  83          * here
  84          */
  85 };
  86
  87 /**
  88  * struct scsi_vpd - SCSI Vital Product Data
  89  * @rcu: For kfree_rcu().
  90  * @len: Length in bytes of @data.
  91  * @data: VPD data as defined in various T10 SCSI standard documents.
  92  */
  93 struct scsi_vpd {
  94         struct rcu_head rcu;
  95         int             len;
  96         unsigned char   data[];
  97 };
  98
  99 struct scsi_device {
 100         struct Scsi_Host *host;
 101         struct request_queue *request_queue;
 102
 103         /* the next two are protected by the host->host_lock */
 104         struct list_head    siblings;   /* list of all devices on this host */
 105         struct list_head    same_target_siblings; /* just the devices sharing same target id */
 106
 107         atomic_t device_busy;           /* commands actually active on LLDD */
 108         atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 109
 110         spinlock_t list_lock;
 111         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
 112         struct list_head starved_entry;
 113         unsigned short queue_depth;     /* How deep of a queue we want */
 114         unsigned short max_queue_depth; /* max queue depth */
 115         unsigned short last_queue_full_depth; /* These two are used by */
 116         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 117         unsigned long last_queue_full_time;     /* last queue full time */
 118         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 119 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 120
 121         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 122
 123         unsigned int id, channel;
 124         u64 lun;
 125         unsigned int manufacturer;      /* Manufacturer of device, for using
 126                                          * vendor-specific cmd's */
 127         unsigned sector_size;   /* size in bytes */
 128
 129         void *hostdata;         /* available to low-level driver */
 130         unsigned char type;
 131         char scsi_level;
 132         char inq_periph_qual;   /* PQ from INQUIRY data */
 133         struct mutex inquiry_mutex;
 134         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 135         unsigned char * inquiry;        /* INQUIRY response data */
 136         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 137         const char * model;             /* ... after scan; point to static string */
 138         const char * rev;               /* ... "nullnullnullnull" before scan */
 139
 140 #define SCSI_VPD_PG_LEN                255
 141         struct scsi_vpd __rcu *vpd_pg83;
 142         struct scsi_vpd __rcu *vpd_pg80;
 143         unsigned char current_tag;      /* current tag */
 144         struct scsi_target      *sdev_target;   /* used only for single_lun */
 145
 146         blist_flags_t           sdev_bflags; /* black/white flags as also found in
 147                                  * scsi_devinfo.[hc]. For now used only to
 148                                  * pass settings from slave_alloc to scsi
 149                                  * core. */
 150         unsigned int eh_timeout; /* Error handling timeout */
 151         unsigned removable:1;
 152         unsigned changed:1;     /* Data invalid due to media change */
 153         unsigned busy:1;        /* Used to prevent races */
 154         unsigned lockable:1;    /* Able to prevent media removal */
 155         unsigned locked:1;      /* Media removal disabled */
 156         unsigned borken:1;      /* Tell the Seagate driver to be
 157                                  * painfully slow on this device */
 158         unsigned disconnect:1;  /* can disconnect */
 159         unsigned soft_reset:1;  /* Uses soft reset option */
 160         unsigned sdtr:1;        /* Device supports SDTR messages */
 161         unsigned wdtr:1;        /* Device supports WDTR messages */
 162         unsigned ppr:1;         /* Device supports PPR messages */
 163         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 164         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 165         unsigned was_reset:1;   /* There was a bus reset on the bus for
 166                                  * this device */
 167         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 168                                      * because we did a bus reset. */
 169         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 170         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 171         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 172         unsigned no_write_same:1;       /* no WRITE SAME command */
 173         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 174         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 175         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 176         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 177         unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 178         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 179         unsigned no_start_on_add:1;     /* do not issue start on add */
 180         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 181         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 182         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 183         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 184         unsigned select_no_atn:1;
 185         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 186         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 187         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 188         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 189                                            SD_LAST_BUGGY_SECTORS */
 190         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 191         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 192         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 193         unsigned security_supported:1;  /* Supports Security Protocols */
 194         unsigned is_visible:1;  /* is the device visible in sysfs */
 195         unsigned wce_default_on:1;      /* Cache is ON by default */
 196         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 197         unsigned broken_fua:1;          /* Don't set FUA bit */
 198         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 199         unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 200
 201         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 202
 203         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 204         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 205         struct list_head event_list;    /* asserted events */
 206         struct work_struct event_work;
 207
 208         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 209 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 210
 211         atomic_t iorequest_cnt;
 212         atomic_t iodone_cnt;
 213         atomic_t ioerr_cnt;
 214
 215         struct device           sdev_gendev,
 216                                 sdev_dev;
 217
 218         struct execute_work     ew; /* used to get process context on put */
 219         struct work_struct      requeue_work;
 220
 221         struct scsi_device_handler *handler;
 222         void                    *handler_data;
 223
 224         unsigned char           access_state;
 225         struct mutex            state_mutex;
 226         enum scsi_device_state sdev_state;
 227         struct task_struct      *quiesced_by;
 228         unsigned long           sdev_data[0];
 229 } __attribute__((aligned(sizeof(unsigned long))));
 230
 231 #define to_scsi_device(d)       \
 232         container_of(d, struct scsi_device, sdev_gendev)
 233 #define class_to_sdev(d)        \
 234         container_of(d, struct scsi_device, sdev_dev)
 235 #define transport_class_to_sdev(class_dev) \
 236         to_scsi_device(class_dev->parent)
 237
 238 #define sdev_dbg(sdev, fmt, a...) \
 239         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 240
 241 /*
 242  * like scmd_printk, but the device name is passed in
 243  * as a string pointer
 244  */
 245 __printf(4, 5) void
 246 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 247                 const char *, ...);
 248
 249 #define sdev_printk(l, sdev, fmt, a...)                         \
 250         sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 251
 252 __printf(3, 4) void
 253 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 254
 255 #define scmd_dbg(scmd, fmt, a...)                                          \
 256         do {                                                               \
 257                 if ((scmd)->request->rq_disk)                              \
 258                         sdev_dbg((scmd)->device, "[%s] " fmt,              \
 259                                  (scmd)->request->rq_disk->disk_name, ##a);\
 260                 else                                                       \
 261                         sdev_dbg((scmd)->device, fmt, ##a);                \
 262         } while (0)
 263
 264 enum scsi_target_state {
 265         STARGET_CREATED = 1,
 266         STARGET_RUNNING,
 267         STARGET_REMOVE,
 268         STARGET_CREATED_REMOVE,
 269         STARGET_DEL,
 270 };
 271
 272 /*
 273  * scsi_target: representation of a scsi target, for now, this is only
 274  * used for single_lun devices. If no one has active IO to the target,
 275  * starget_sdev_user is NULL, else it points to the active sdev.
 276  */
 277 struct scsi_target {
 278         struct scsi_device      *starget_sdev_user;
 279         struct list_head        siblings;
 280         struct list_head        devices;
 281         struct device           dev;
 282         struct kref             reap_ref; /* last put renders target invisible */
 283         unsigned int            channel;
 284         unsigned int            id; /* target id ... replace
 285                                      * scsi_device.id eventually */
 286         unsigned int            create:1; /* signal that it needs to be added */
 287         unsigned int            single_lun:1;   /* Indicates we should only
 288                                                  * allow I/O to one of the luns
 289                                                  * for the device at a time. */
 290         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 291                                                  * means no lun present. */
 292         unsigned int            no_report_luns:1;       /* Don't use
 293                                                  * REPORT LUNS for scanning. */
 294         unsigned int            expecting_lun_change:1; /* A device has reported
 295                                                  * a 3F/0E UA, other devices on
 296                                                  * the same target will also. */
 297         /* commands actually active on LLD. */
 298         atomic_t                target_busy;
 299         atomic_t                target_blocked;
 300
 301         /*
 302          * LLDs should set this in the slave_alloc host template callout.
 303          * If set to zero then there is not limit.
 304          */
 305         unsigned int            can_queue;
 306         unsigned int            max_target_blocked;
 307 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 308
 309         char                    scsi_level;
 310         enum scsi_target_state  state;
 311         void                    *hostdata; /* available to low-level driver */
 312         unsigned long           starget_data[0]; /* for the transport */
 313         /* starget_data must be the last element!!!! */
 314 } __attribute__((aligned(sizeof(unsigned long))));
 315
 316 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 317 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 318 {
 319         return to_scsi_target(sdev->sdev_gendev.parent);
 320 }
 321 #define transport_class_to_starget(class_dev) \
 322         to_scsi_target(class_dev->parent)
 323
 324 #define starget_printk(prefix, starget, fmt, a...)      \
 325         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 326
 327 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 328                 uint, uint, u64, void *hostdata);
 329 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 330                            uint target, u64 lun);
 331 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 332 extern void scsi_remove_device(struct scsi_device *);
 333 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 334 void scsi_attach_vpd(struct scsi_device *sdev);
 335
 336 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 337 extern int __must_check scsi_device_get(struct scsi_device *);
 338 extern void scsi_device_put(struct scsi_device *);
 339 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 340                                               uint, uint, u64);
 341 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 342                                                 uint, uint, u64);
 343 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 344                                                         u64);
 345 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 346                                                           u64);
 347 extern void starget_for_each_device(struct scsi_target *, void *,
 348                      void (*fn)(struct scsi_device *, void *));
 349 extern void __starget_for_each_device(struct scsi_target *, void *,
 350                                       void (*fn)(struct scsi_device *,
 351                                                  void *));
 352
 353 /* only exposed to implement shost_for_each_device */
 354 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 355                                                   struct scsi_device *);
 356
 357 /**
 358  * shost_for_each_device - iterate over all devices of a host
 359  * @sdev: the &struct scsi_device to use as a cursor
 360  * @shost: the &struct scsi_host to iterate over
 361  *
 362  * Iterator that returns each device attached to @shost.  This loop
 363  * takes a reference on each device and releases it at the end.  If
 364  * you break out of the loop, you must call scsi_device_put(sdev).
 365  */
 366 #define shost_for_each_device(sdev, shost) \
 367         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 368              (sdev); \
 369              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 370
 371 /**
 372  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 373  * @sdev: the &struct scsi_device to use as a cursor
 374  * @shost: the &struct scsi_host to iterate over
 375  *
 376  * Iterator that returns each device attached to @shost.  It does _not_
 377  * take a reference on the scsi_device, so the whole loop must be
 378  * protected by shost->host_lock.
 379  *
 380  * Note: The only reason to use this is because you need to access the
 381  * device list in interrupt context.  Otherwise you really want to use
 382  * shost_for_each_device instead.
 383  */
 384 #define __shost_for_each_device(sdev, shost) \
 385         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 386
 387 extern int scsi_change_queue_depth(struct scsi_device *, int);
 388 extern int scsi_track_queue_full(struct scsi_device *, int);
 389
 390 extern int scsi_set_medium_removal(struct scsi_device *, char);
 391
 392 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 393                            unsigned char *buffer, int len, int timeout,
 394                            int retries, struct scsi_mode_data *data,
 395                            struct scsi_sense_hdr *);
 396 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 397                             int modepage, unsigned char *buffer, int len,
 398                             int timeout, int retries,
 399                             struct scsi_mode_data *data,
 400                             struct scsi_sense_hdr *);
 401 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 402                                 int retries, struct scsi_sense_hdr *sshdr);
 403 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 404                              int buf_len);
 405 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 406                               unsigned int len, unsigned char opcode);
 407 extern int scsi_device_set_state(struct scsi_device *sdev,
 408                                  enum scsi_device_state state);
 409 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 410                                           gfp_t gfpflags);
 411 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 412 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 413                           enum scsi_device_event evt_type, gfp_t gfpflags);
 414 extern int scsi_device_quiesce(struct scsi_device *sdev);
 415 extern void scsi_device_resume(struct scsi_device *sdev);
 416 extern void scsi_target_quiesce(struct scsi_target *);
 417 extern void scsi_target_resume(struct scsi_target *);
 418 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 419                              unsigned int id, u64 lun,
 420                              enum scsi_scan_mode rescan);
 421 extern void scsi_target_reap(struct scsi_target *);
 422 extern void scsi_target_block(struct device *);
 423 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 424 extern void scsi_remove_target(struct device *);
 425 extern const char *scsi_device_state_name(enum scsi_device_state);
 426 extern int scsi_is_sdev_device(const struct device *);
 427 extern int scsi_is_target_device(const struct device *);
 428 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 429 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 430                         int data_direction, void *buffer, unsigned bufflen,
 431                         unsigned char *sense, struct scsi_sense_hdr *sshdr,
 432                         int timeout, int retries, u64 flags,
 433                         req_flags_t rq_flags, int *resid);
 434 static inline int scsi_execute_req(struct scsi_device *sdev,
 435         const unsigned char *cmd, int data_direction, void *buffer,
 436         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 437         int retries, int *resid)
 438 {
 439         return scsi_execute(sdev, cmd, data_direction, buffer,
 440                 bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 441 }
 442 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 443 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 444 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 445 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 446
 447 #ifdef CONFIG_PM
 448 extern int scsi_autopm_get_device(struct scsi_device *);
 449 extern void scsi_autopm_put_device(struct scsi_device *);
 450 #else
 451 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 452 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 453 #endif /* CONFIG_PM */
 454
 455 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 456 {
 457         return device_reprobe(&sdev->sdev_gendev);
 458 }
 459
 460 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 461 {
 462         return sdev->channel;
 463 }
 464
 465 static inline unsigned int sdev_id(struct scsi_device *sdev)
 466 {
 467         return sdev->id;
 468 }
 469
 470 #define scmd_id(scmd) sdev_id((scmd)->device)
 471 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 472
 473 /*
 474  * checks for positions of the SCSI state machine
 475  */
 476 static inline int scsi_device_online(struct scsi_device *sdev)
 477 {
 478         return (sdev->sdev_state != SDEV_OFFLINE &&
 479                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 480                 sdev->sdev_state != SDEV_DEL);
 481 }
 482 static inline int scsi_device_blocked(struct scsi_device *sdev)
 483 {
 484         return sdev->sdev_state == SDEV_BLOCK ||
 485                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 486 }
 487 static inline int scsi_device_created(struct scsi_device *sdev)
 488 {
 489         return sdev->sdev_state == SDEV_CREATED ||
 490                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 491 }
 492
 493 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 494 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 495                                         enum scsi_device_state new_state);
 496
 497 /* accessor functions for the SCSI parameters */
 498 static inline int scsi_device_sync(struct scsi_device *sdev)
 499 {
 500         return sdev->sdtr;
 501 }
 502 static inline int scsi_device_wide(struct scsi_device *sdev)
 503 {
 504         return sdev->wdtr;
 505 }
 506 static inline int scsi_device_dt(struct scsi_device *sdev)
 507 {
 508         return sdev->ppr;
 509 }
 510 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 511 {
 512         if (sdev->inquiry_len < 57)
 513                 return 0;
 514         return (sdev->inquiry[56] & 0x0c) == 0x04;
 515 }
 516 static inline int scsi_device_ius(struct scsi_device *sdev)
 517 {
 518         if (sdev->inquiry_len < 57)
 519                 return 0;
 520         return sdev->inquiry[56] & 0x01;
 521 }
 522 static inline int scsi_device_qas(struct scsi_device *sdev)
 523 {
 524         if (sdev->inquiry_len < 57)
 525                 return 0;
 526         return sdev->inquiry[56] & 0x02;
 527 }
 528 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 529 {
 530         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 531 }
 532
 533 static inline int scsi_device_protection(struct scsi_device *sdev)
 534 {
 535         if (sdev->no_dif)
 536                 return 0;
 537
 538         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 539 }
 540
 541 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 542 {
 543         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 544 }
 545
 546 /**
 547  * scsi_device_supports_vpd - test if a device supports VPD pages
 548  * @sdev: the &struct scsi_device to test
 549  *
 550  * If the 'try_vpd_pages' flag is set it takes precedence.
 551  * Otherwise we will assume VPD pages are supported if the
 552  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 553  */
 554 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 555 {
 556         /* Attempt VPD inquiry if the device blacklist explicitly calls
 557          * for it.
 558          */
 559         if (sdev->try_vpd_pages)
 560                 return 1;
 561         /*
 562          * Although VPD inquiries can go to SCSI-2 type devices,
 563          * some USB ones crash on receiving them, and the pages
 564          * we currently ask for are mandatory for SPC-2 and beyond
 565          */
 566         if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 567                 return 1;
 568         return 0;
 569 }
 570
 571 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 572         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 573 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 574
 575 #endif /* _SCSI_SCSI_DEVICE_H */