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