include/scsi/scsi_device.h

   1 #ifndef _SCSI_SCSI_DEVICE_H
   2 #define _SCSI_SCSI_DEVICE_H
   3
   4 #include <linux/list.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/workqueue.h>
   7 #include <linux/blkdev.h>
   8 #include <scsi/scsi.h>
   9 #include <linux/atomic.h>
  10
  11 struct device;
  12 struct request_queue;
  13 struct scsi_cmnd;
  14 struct scsi_lun;
  15 struct scsi_sense_hdr;
  16
  17 struct scsi_mode_data {
  18         __u32   length;
  19         __u16   block_descriptor_length;
  20         __u8    medium_type;
  21         __u8    device_specific;
  22         __u8    header_length;
  23         __u8    longlba:1;
  24 };
  25
  26 /*
  27  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  28  * (for the ascii descriptions) and the state model enforcer:
  29  * scsi_lib:scsi_device_set_state().
  30  */
  31 enum scsi_device_state {
  32         SDEV_CREATED = 1,       /* device created but not added to sysfs
  33                                  * Only internal commands allowed (for inq) */
  34         SDEV_RUNNING,           /* device properly configured
  35                                  * All commands allowed */
  36         SDEV_CANCEL,            /* beginning to delete device
  37                                  * Only error handler commands allowed */
  38         SDEV_DEL,               /* device deleted
  39                                  * no commands allowed */
  40         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  41                                  * will be accepted, only specials (which
  42                                  * originate in the mid-layer) */
  43         SDEV_OFFLINE,           /* Device offlined (by error handling or
  44                                  * user request */
  45         SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  46         SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  47                                  * scsi commands from user or midlayer
  48                                  * should be issued to the scsi
  49                                  * lld. */
  50         SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  51 };
  52
  53 enum scsi_device_event {
  54         SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  55         SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  56         SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  57         SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  58         SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  59         SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  60
  61         SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  62         SDEV_EVT_LAST           = SDEV_EVT_LUN_CHANGE_REPORTED,
  63
  64         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  65 };
  66
  67 struct scsi_event {
  68         enum scsi_device_event  evt_type;
  69         struct list_head        node;
  70
  71         /* put union of data structures, for non-simple event types,
  72          * here
  73          */
  74 };
  75
  76 struct scsi_device {
  77         struct Scsi_Host *host;
  78         struct request_queue *request_queue;
  79
  80         /* the next two are protected by the host->host_lock */
  81         struct list_head    siblings;   /* list of all devices on this host */
  82         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  83
  84         /* this is now protected by the request_queue->queue_lock */
  85         unsigned int device_busy;       /* commands actually active on
  86                                          * low-level. protected by queue_lock. */
  87         spinlock_t list_lock;
  88         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  89         struct list_head starved_entry;
  90         struct scsi_cmnd *current_cmnd; /* currently active command */
  91         unsigned short queue_depth;     /* How deep of a queue we want */
  92         unsigned short max_queue_depth; /* max queue depth */
  93         unsigned short last_queue_full_depth; /* These two are used by */
  94         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  95         unsigned long last_queue_full_time;     /* last queue full time */
  96         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
  97 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
  98
  99         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 100
 101         unsigned int id, lun, channel;
 102
 103         unsigned int manufacturer;      /* Manufacturer of device, for using
 104                                          * vendor-specific cmd's */
 105         unsigned sector_size;   /* size in bytes */
 106
 107         void *hostdata;         /* available to low-level driver */
 108         char type;
 109         char scsi_level;
 110         char inq_periph_qual;   /* PQ from INQUIRY data */
 111         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 112         unsigned char * inquiry;        /* INQUIRY response data */
 113         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 114         const char * model;             /* ... after scan; point to static string */
 115         const char * rev;               /* ... "nullnullnullnull" before scan */
 116
 117 #define SCSI_VPD_PG_LEN                255
 118         int vpd_pg83_len;
 119         unsigned char *vpd_pg83;
 120         int vpd_pg80_len;
 121         unsigned char *vpd_pg80;
 122         unsigned char current_tag;      /* current tag */
 123         struct scsi_target      *sdev_target;   /* used only for single_lun */
 124
 125         unsigned int    sdev_bflags; /* black/white flags as also found in
 126                                  * scsi_devinfo.[hc]. For now used only to
 127                                  * pass settings from slave_alloc to scsi
 128                                  * core. */
 129         unsigned int eh_timeout; /* Error handling timeout */
 130         unsigned writeable:1;
 131         unsigned removable:1;
 132         unsigned changed:1;     /* Data invalid due to media change */
 133         unsigned busy:1;        /* Used to prevent races */
 134         unsigned lockable:1;    /* Able to prevent media removal */
 135         unsigned locked:1;      /* Media removal disabled */
 136         unsigned borken:1;      /* Tell the Seagate driver to be
 137                                  * painfully slow on this device */
 138         unsigned disconnect:1;  /* can disconnect */
 139         unsigned soft_reset:1;  /* Uses soft reset option */
 140         unsigned sdtr:1;        /* Device supports SDTR messages */
 141         unsigned wdtr:1;        /* Device supports WDTR messages */
 142         unsigned ppr:1;         /* Device supports PPR messages */
 143         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 144         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 145         unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
 146         unsigned was_reset:1;   /* There was a bus reset on the bus for
 147                                  * this device */
 148         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 149                                      * because we did a bus reset. */
 150         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 151         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 152         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 153         unsigned no_write_same:1;       /* no WRITE SAME command */
 154         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 155         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 156         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 157         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 158         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 159         unsigned no_start_on_add:1;     /* do not issue start on add */
 160         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 161         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 162         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 163         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 164         unsigned select_no_atn:1;
 165         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 166         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 167         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 168         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 169                                            SD_LAST_BUGGY_SECTORS */
 170         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 171         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 172         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 173         unsigned is_visible:1;  /* is the device visible in sysfs */
 174         unsigned wce_default_on:1;      /* Cache is ON by default */
 175         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 176
 177         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 178
 179         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 180         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 181         struct list_head event_list;    /* asserted events */
 182         struct work_struct event_work;
 183
 184         unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 185
 186         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 187 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 188
 189         atomic_t iorequest_cnt;
 190         atomic_t iodone_cnt;
 191         atomic_t ioerr_cnt;
 192
 193         struct device           sdev_gendev,
 194                                 sdev_dev;
 195
 196         struct execute_work     ew; /* used to get process context on put */
 197         struct work_struct      requeue_work;
 198
 199         struct scsi_dh_data     *scsi_dh_data;
 200         enum scsi_device_state sdev_state;
 201         unsigned long           sdev_data[0];
 202 } __attribute__((aligned(sizeof(unsigned long))));
 203
 204 struct scsi_dh_devlist {
 205         char *vendor;
 206         char *model;
 207 };
 208
 209 typedef void (*activate_complete)(void *, int);
 210 struct scsi_device_handler {
 211         /* Used by the infrastructure */
 212         struct list_head list; /* list of scsi_device_handlers */
 213
 214         /* Filled by the hardware handler */
 215         struct module *module;
 216         const char *name;
 217         const struct scsi_dh_devlist *devlist;
 218         int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
 219         int (*attach)(struct scsi_device *);
 220         void (*detach)(struct scsi_device *);
 221         int (*activate)(struct scsi_device *, activate_complete, void *);
 222         int (*prep_fn)(struct scsi_device *, struct request *);
 223         int (*set_params)(struct scsi_device *, const char *);
 224         bool (*match)(struct scsi_device *);
 225 };
 226
 227 struct scsi_dh_data {
 228         struct scsi_device_handler *scsi_dh;
 229         struct scsi_device *sdev;
 230         struct kref kref;
 231         char buf[0];
 232 };
 233
 234 #define to_scsi_device(d)       \
 235         container_of(d, struct scsi_device, sdev_gendev)
 236 #define class_to_sdev(d)        \
 237         container_of(d, struct scsi_device, sdev_dev)
 238 #define transport_class_to_sdev(class_dev) \
 239         to_scsi_device(class_dev->parent)
 240
 241 #define sdev_printk(prefix, sdev, fmt, a...)    \
 242         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 243
 244 #define sdev_dbg(sdev, fmt, a...) \
 245         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 246
 247 #define scmd_printk(prefix, scmd, fmt, a...)                            \
 248         (scmd)->request->rq_disk ?                                      \
 249         sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 250                     (scmd)->request->rq_disk->disk_name, ##a) :         \
 251         sdev_printk(prefix, (scmd)->device, fmt, ##a)
 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_DEL,
 266 };
 267
 268 /*
 269  * scsi_target: representation of a scsi target, for now, this is only
 270  * used for single_lun devices. If no one has active IO to the target,
 271  * starget_sdev_user is NULL, else it points to the active sdev.
 272  */
 273 struct scsi_target {
 274         struct scsi_device      *starget_sdev_user;
 275         struct list_head        siblings;
 276         struct list_head        devices;
 277         struct device           dev;
 278         struct kref             reap_ref; /* last put renders target invisible */
 279         unsigned int            channel;
 280         unsigned int            id; /* target id ... replace
 281                                      * scsi_device.id eventually */
 282         unsigned int            create:1; /* signal that it needs to be added */
 283         unsigned int            single_lun:1;   /* Indicates we should only
 284                                                  * allow I/O to one of the luns
 285                                                  * for the device at a time. */
 286         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 287                                                  * means no lun present. */
 288         unsigned int            no_report_luns:1;       /* Don't use
 289                                                  * REPORT LUNS for scanning. */
 290         unsigned int            expecting_lun_change:1; /* A device has reported
 291                                                  * a 3F/0E UA, other devices on
 292                                                  * the same target will also. */
 293         /* commands actually active on LLD. protected by host lock. */
 294         unsigned int            target_busy;
 295         /*
 296          * LLDs should set this in the slave_alloc host template callout.
 297          * If set to zero then there is not limit.
 298          */
 299         unsigned int            can_queue;
 300         unsigned int            target_blocked;
 301         unsigned int            max_target_blocked;
 302 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 303
 304         char                    scsi_level;
 305         enum scsi_target_state  state;
 306         void                    *hostdata; /* available to low-level driver */
 307         unsigned long           starget_data[0]; /* for the transport */
 308         /* starget_data must be the last element!!!! */
 309 } __attribute__((aligned(sizeof(unsigned long))));
 310
 311 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 312 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 313 {
 314         return to_scsi_target(sdev->sdev_gendev.parent);
 315 }
 316 #define transport_class_to_starget(class_dev) \
 317         to_scsi_target(class_dev->parent)
 318
 319 #define starget_printk(prefix, starget, fmt, a...)      \
 320         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 321
 322 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 323                 uint, uint, uint, void *hostdata);
 324 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 325                            uint target, uint lun);
 326 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 327 extern void scsi_remove_device(struct scsi_device *);
 328 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 329 void scsi_attach_vpd(struct scsi_device *sdev);
 330
 331 extern int scsi_device_get(struct scsi_device *);
 332 extern void scsi_device_put(struct scsi_device *);
 333 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 334                                               uint, uint, uint);
 335 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 336                                                 uint, uint, uint);
 337 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 338                                                         uint);
 339 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 340                                                           uint);
 341 extern void starget_for_each_device(struct scsi_target *, void *,
 342                      void (*fn)(struct scsi_device *, void *));
 343 extern void __starget_for_each_device(struct scsi_target *, void *,
 344                                       void (*fn)(struct scsi_device *,
 345                                                  void *));
 346
 347 /* only exposed to implement shost_for_each_device */
 348 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 349                                                   struct scsi_device *);
 350
 351 /**
 352  * shost_for_each_device - iterate over all devices of a host
 353  * @sdev: the &struct scsi_device to use as a cursor
 354  * @shost: the &struct scsi_host to iterate over
 355  *
 356  * Iterator that returns each device attached to @shost.  This loop
 357  * takes a reference on each device and releases it at the end.  If
 358  * you break out of the loop, you must call scsi_device_put(sdev).
 359  */
 360 #define shost_for_each_device(sdev, shost) \
 361         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 362              (sdev); \
 363              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 364
 365 /**
 366  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 367  * @sdev: the &struct scsi_device to use as a cursor
 368  * @shost: the &struct scsi_host to iterate over
 369  *
 370  * Iterator that returns each device attached to @shost.  It does _not_
 371  * take a reference on the scsi_device, so the whole loop must be
 372  * protected by shost->host_lock.
 373  *
 374  * Note: The only reason to use this is because you need to access the
 375  * device list in interrupt context.  Otherwise you really want to use
 376  * shost_for_each_device instead.
 377  */
 378 #define __shost_for_each_device(sdev, shost) \
 379         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 380
 381 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 382 extern int scsi_track_queue_full(struct scsi_device *, int);
 383
 384 extern int scsi_set_medium_removal(struct scsi_device *, char);
 385
 386 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 387                            unsigned char *buffer, int len, int timeout,
 388                            int retries, struct scsi_mode_data *data,
 389                            struct scsi_sense_hdr *);
 390 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 391                             int modepage, unsigned char *buffer, int len,
 392                             int timeout, int retries,
 393                             struct scsi_mode_data *data,
 394                             struct scsi_sense_hdr *);
 395 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 396                                 int retries, struct scsi_sense_hdr *sshdr);
 397 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 398                              int buf_len);
 399 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 400                               unsigned int len, unsigned char opcode);
 401 extern int scsi_device_set_state(struct scsi_device *sdev,
 402                                  enum scsi_device_state state);
 403 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 404                                           gfp_t gfpflags);
 405 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 406 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 407                           enum scsi_device_event evt_type, gfp_t gfpflags);
 408 extern int scsi_device_quiesce(struct scsi_device *sdev);
 409 extern void scsi_device_resume(struct scsi_device *sdev);
 410 extern void scsi_target_quiesce(struct scsi_target *);
 411 extern void scsi_target_resume(struct scsi_target *);
 412 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 413                              unsigned int id, unsigned int lun, int rescan);
 414 extern void scsi_target_reap(struct scsi_target *);
 415 extern void scsi_target_block(struct device *);
 416 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 417 extern void scsi_remove_target(struct device *);
 418 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 419 extern int scsilun_to_int(struct scsi_lun *);
 420 extern const char *scsi_device_state_name(enum scsi_device_state);
 421 extern int scsi_is_sdev_device(const struct device *);
 422 extern int scsi_is_target_device(const struct device *);
 423 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 424                         int data_direction, void *buffer, unsigned bufflen,
 425                         unsigned char *sense, int timeout, int retries,
 426                         u64 flags, int *resid);
 427 extern int scsi_execute_req_flags(struct scsi_device *sdev,
 428         const unsigned char *cmd, int data_direction, void *buffer,
 429         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 430         int retries, int *resid, u64 flags);
 431 static inline int scsi_execute_req(struct scsi_device *sdev,
 432         const unsigned char *cmd, int data_direction, void *buffer,
 433         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 434         int retries, int *resid)
 435 {
 436         return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
 437                 bufflen, sshdr, timeout, retries, resid, 0);
 438 }
 439 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 440 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 441
 442 #ifdef CONFIG_PM_RUNTIME
 443 extern int scsi_autopm_get_device(struct scsi_device *);
 444 extern void scsi_autopm_put_device(struct scsi_device *);
 445 #else
 446 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 447 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 448 #endif /* CONFIG_PM_RUNTIME */
 449
 450 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 451 {
 452         return device_reprobe(&sdev->sdev_gendev);
 453 }
 454
 455 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 456 {
 457         return sdev->channel;
 458 }
 459
 460 static inline unsigned int sdev_id(struct scsi_device *sdev)
 461 {
 462         return sdev->id;
 463 }
 464
 465 #define scmd_id(scmd) sdev_id((scmd)->device)
 466 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 467
 468 /*
 469  * checks for positions of the SCSI state machine
 470  */
 471 static inline int scsi_device_online(struct scsi_device *sdev)
 472 {
 473         return (sdev->sdev_state != SDEV_OFFLINE &&
 474                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 475                 sdev->sdev_state != SDEV_DEL);
 476 }
 477 static inline int scsi_device_blocked(struct scsi_device *sdev)
 478 {
 479         return sdev->sdev_state == SDEV_BLOCK ||
 480                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 481 }
 482 static inline int scsi_device_created(struct scsi_device *sdev)
 483 {
 484         return sdev->sdev_state == SDEV_CREATED ||
 485                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 486 }
 487
 488 /* accessor functions for the SCSI parameters */
 489 static inline int scsi_device_sync(struct scsi_device *sdev)
 490 {
 491         return sdev->sdtr;
 492 }
 493 static inline int scsi_device_wide(struct scsi_device *sdev)
 494 {
 495         return sdev->wdtr;
 496 }
 497 static inline int scsi_device_dt(struct scsi_device *sdev)
 498 {
 499         return sdev->ppr;
 500 }
 501 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 502 {
 503         if (sdev->inquiry_len < 57)
 504                 return 0;
 505         return (sdev->inquiry[56] & 0x0c) == 0x04;
 506 }
 507 static inline int scsi_device_ius(struct scsi_device *sdev)
 508 {
 509         if (sdev->inquiry_len < 57)
 510                 return 0;
 511         return sdev->inquiry[56] & 0x01;
 512 }
 513 static inline int scsi_device_qas(struct scsi_device *sdev)
 514 {
 515         if (sdev->inquiry_len < 57)
 516                 return 0;
 517         return sdev->inquiry[56] & 0x02;
 518 }
 519 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 520 {
 521         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 522 }
 523
 524 static inline int scsi_device_protection(struct scsi_device *sdev)
 525 {
 526         if (sdev->no_dif)
 527                 return 0;
 528
 529         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 530 }
 531
 532 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 533 {
 534         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 535 }
 536
 537 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 538         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 539 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 540
 541 #endif /* _SCSI_SCSI_DEVICE_H */