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         atomic_t device_busy;           /* commands actually active on LLDD */
  85         atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
  86
  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, channel;
 102         u64 lun;
 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 removable:1;
 131         unsigned changed:1;     /* Data invalid due to media change */
 132         unsigned busy:1;        /* Used to prevent races */
 133         unsigned lockable:1;    /* Able to prevent media removal */
 134         unsigned locked:1;      /* Media removal disabled */
 135         unsigned borken:1;      /* Tell the Seagate driver to be
 136                                  * painfully slow on this device */
 137         unsigned disconnect:1;  /* can disconnect */
 138         unsigned soft_reset:1;  /* Uses soft reset option */
 139         unsigned sdtr:1;        /* Device supports SDTR messages */
 140         unsigned wdtr:1;        /* Device supports WDTR messages */
 141         unsigned ppr:1;         /* Device supports PPR messages */
 142         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 143         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 144         unsigned was_reset:1;   /* There was a bus reset on the bus for
 145                                  * this device */
 146         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 147                                      * because we did a bus reset. */
 148         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 149         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 150         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 151         unsigned no_write_same:1;       /* no WRITE SAME command */
 152         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 153         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 154         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 155         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 156         unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 157         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 158         unsigned no_start_on_add:1;     /* do not issue start on add */
 159         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 160         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 161         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 162         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 163         unsigned select_no_atn:1;
 164         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 165         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 166         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 167         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 168                                            SD_LAST_BUGGY_SECTORS */
 169         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 170         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 171         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 172         unsigned is_visible:1;  /* is the device visible in sysfs */
 173         unsigned wce_default_on:1;      /* Cache is ON by default */
 174         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 175         unsigned broken_fua:1;          /* Don't set FUA bit */
 176         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 177
 178         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 179
 180         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 181         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 182         struct list_head event_list;    /* asserted events */
 183         struct work_struct event_work;
 184
 185         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 186 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 187
 188         atomic_t iorequest_cnt;
 189         atomic_t iodone_cnt;
 190         atomic_t ioerr_cnt;
 191
 192         struct device           sdev_gendev,
 193                                 sdev_dev;
 194
 195         struct execute_work     ew; /* used to get process context on put */
 196         struct work_struct      requeue_work;
 197
 198         struct scsi_dh_data     *scsi_dh_data;
 199         enum scsi_device_state sdev_state;
 200         unsigned long           sdev_data[0];
 201 } __attribute__((aligned(sizeof(unsigned long))));
 202
 203 typedef void (*activate_complete)(void *, int);
 204 struct scsi_device_handler {
 205         /* Used by the infrastructure */
 206         struct list_head list; /* list of scsi_device_handlers */
 207
 208         /* Filled by the hardware handler */
 209         struct module *module;
 210         const char *name;
 211         int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
 212         struct scsi_dh_data *(*attach)(struct scsi_device *);
 213         void (*detach)(struct scsi_device *);
 214         int (*activate)(struct scsi_device *, activate_complete, void *);
 215         int (*prep_fn)(struct scsi_device *, struct request *);
 216         int (*set_params)(struct scsi_device *, const char *);
 217         bool (*match)(struct scsi_device *);
 218 };
 219
 220 struct scsi_dh_data {
 221         struct scsi_device_handler *scsi_dh;
 222         struct scsi_device *sdev;
 223         struct kref kref;
 224 };
 225
 226 #define to_scsi_device(d)       \
 227         container_of(d, struct scsi_device, sdev_gendev)
 228 #define class_to_sdev(d)        \
 229         container_of(d, struct scsi_device, sdev_dev)
 230 #define transport_class_to_sdev(class_dev) \
 231         to_scsi_device(class_dev->parent)
 232
 233 #define sdev_printk(prefix, sdev, fmt, a...)    \
 234         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 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 #define sdev_prefix_printk(l, sdev, p, fmt, a...)                       \
 244         (p) ?                                                           \
 245         sdev_printk(l, sdev, "[%s] " fmt, p, ##a) :                     \
 246         sdev_printk(l, sdev, fmt, ##a)
 247
 248 #define scmd_printk(prefix, scmd, fmt, a...)                            \
 249         (scmd)->request->rq_disk ?                                      \
 250         sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 251                     (scmd)->request->rq_disk->disk_name, ##a) :         \
 252         sdev_printk(prefix, (scmd)->device, fmt, ##a)
 253
 254 #define scmd_dbg(scmd, fmt, a...)                                          \
 255         do {                                                               \
 256                 if ((scmd)->request->rq_disk)                              \
 257                         sdev_dbg((scmd)->device, "[%s] " fmt,              \
 258                                  (scmd)->request->rq_disk->disk_name, ##a);\
 259                 else                                                       \
 260                         sdev_dbg((scmd)->device, fmt, ##a);                \
 261         } while (0)
 262
 263 enum scsi_target_state {
 264         STARGET_CREATED = 1,
 265         STARGET_RUNNING,
 266         STARGET_DEL,
 267 };
 268
 269 /*
 270  * scsi_target: representation of a scsi target, for now, this is only
 271  * used for single_lun devices. If no one has active IO to the target,
 272  * starget_sdev_user is NULL, else it points to the active sdev.
 273  */
 274 struct scsi_target {
 275         struct scsi_device      *starget_sdev_user;
 276         struct list_head        siblings;
 277         struct list_head        devices;
 278         struct device           dev;
 279         struct kref             reap_ref; /* last put renders target invisible */
 280         unsigned int            channel;
 281         unsigned int            id; /* target id ... replace
 282                                      * scsi_device.id eventually */
 283         unsigned int            create:1; /* signal that it needs to be added */
 284         unsigned int            single_lun:1;   /* Indicates we should only
 285                                                  * allow I/O to one of the luns
 286                                                  * for the device at a time. */
 287         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 288                                                  * means no lun present. */
 289         unsigned int            no_report_luns:1;       /* Don't use
 290                                                  * REPORT LUNS for scanning. */
 291         unsigned int            expecting_lun_change:1; /* A device has reported
 292                                                  * a 3F/0E UA, other devices on
 293                                                  * the same target will also. */
 294         /* commands actually active on LLD. */
 295         atomic_t                target_busy;
 296         atomic_t                target_blocked;
 297
 298         /*
 299          * LLDs should set this in the slave_alloc host template callout.
 300          * If set to zero then there is not limit.
 301          */
 302         unsigned int            can_queue;
 303         unsigned int            max_target_blocked;
 304 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 305
 306         char                    scsi_level;
 307         enum scsi_target_state  state;
 308         void                    *hostdata; /* available to low-level driver */
 309         unsigned long           starget_data[0]; /* for the transport */
 310         /* starget_data must be the last element!!!! */
 311 } __attribute__((aligned(sizeof(unsigned long))));
 312
 313 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 314 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 315 {
 316         return to_scsi_target(sdev->sdev_gendev.parent);
 317 }
 318 #define transport_class_to_starget(class_dev) \
 319         to_scsi_target(class_dev->parent)
 320
 321 #define starget_printk(prefix, starget, fmt, a...)      \
 322         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 323
 324 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 325                 uint, uint, u64, void *hostdata);
 326 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 327                            uint target, u64 lun);
 328 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 329 extern void scsi_remove_device(struct scsi_device *);
 330 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 331 void scsi_attach_vpd(struct scsi_device *sdev);
 332
 333 extern int scsi_device_get(struct scsi_device *);
 334 extern void scsi_device_put(struct scsi_device *);
 335 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 336                                               uint, uint, u64);
 337 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 338                                                 uint, uint, u64);
 339 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 340                                                         u64);
 341 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 342                                                           u64);
 343 extern void starget_for_each_device(struct scsi_target *, void *,
 344                      void (*fn)(struct scsi_device *, void *));
 345 extern void __starget_for_each_device(struct scsi_target *, void *,
 346                                       void (*fn)(struct scsi_device *,
 347                                                  void *));
 348
 349 /* only exposed to implement shost_for_each_device */
 350 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 351                                                   struct scsi_device *);
 352
 353 /**
 354  * shost_for_each_device - iterate over all devices of a host
 355  * @sdev: the &struct scsi_device to use as a cursor
 356  * @shost: the &struct scsi_host to iterate over
 357  *
 358  * Iterator that returns each device attached to @shost.  This loop
 359  * takes a reference on each device and releases it at the end.  If
 360  * you break out of the loop, you must call scsi_device_put(sdev).
 361  */
 362 #define shost_for_each_device(sdev, shost) \
 363         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 364              (sdev); \
 365              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 366
 367 /**
 368  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 369  * @sdev: the &struct scsi_device to use as a cursor
 370  * @shost: the &struct scsi_host to iterate over
 371  *
 372  * Iterator that returns each device attached to @shost.  It does _not_
 373  * take a reference on the scsi_device, so the whole loop must be
 374  * protected by shost->host_lock.
 375  *
 376  * Note: The only reason to use this is because you need to access the
 377  * device list in interrupt context.  Otherwise you really want to use
 378  * shost_for_each_device instead.
 379  */
 380 #define __shost_for_each_device(sdev, shost) \
 381         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 382
 383 extern int scsi_change_queue_depth(struct scsi_device *, int);
 384 extern int scsi_track_queue_full(struct scsi_device *, int);
 385
 386 extern int scsi_set_medium_removal(struct scsi_device *, char);
 387
 388 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 389                            unsigned char *buffer, int len, int timeout,
 390                            int retries, struct scsi_mode_data *data,
 391                            struct scsi_sense_hdr *);
 392 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 393                             int modepage, unsigned char *buffer, int len,
 394                             int timeout, int retries,
 395                             struct scsi_mode_data *data,
 396                             struct scsi_sense_hdr *);
 397 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 398                                 int retries, struct scsi_sense_hdr *sshdr);
 399 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 400                              int buf_len);
 401 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 402                               unsigned int len, unsigned char opcode);
 403 extern int scsi_device_set_state(struct scsi_device *sdev,
 404                                  enum scsi_device_state state);
 405 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 406                                           gfp_t gfpflags);
 407 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 408 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 409                           enum scsi_device_event evt_type, gfp_t gfpflags);
 410 extern int scsi_device_quiesce(struct scsi_device *sdev);
 411 extern void scsi_device_resume(struct scsi_device *sdev);
 412 extern void scsi_target_quiesce(struct scsi_target *);
 413 extern void scsi_target_resume(struct scsi_target *);
 414 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 415                              unsigned int id, u64 lun, int rescan);
 416 extern void scsi_target_reap(struct scsi_target *);
 417 extern void scsi_target_block(struct device *);
 418 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 419 extern void scsi_remove_target(struct device *);
 420 extern void int_to_scsilun(u64, struct scsi_lun *);
 421 extern u64 scsilun_to_int(struct scsi_lun *);
 422 extern const char *scsi_device_state_name(enum scsi_device_state);
 423 extern int scsi_is_sdev_device(const struct device *);
 424 extern int scsi_is_target_device(const struct device *);
 425 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 426                         int data_direction, void *buffer, unsigned bufflen,
 427                         unsigned char *sense, int timeout, int retries,
 428                         u64 flags, int *resid);
 429 extern int scsi_execute_req_flags(struct scsi_device *sdev,
 430         const unsigned char *cmd, int data_direction, void *buffer,
 431         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 432         int retries, int *resid, u64 flags);
 433 static inline int scsi_execute_req(struct scsi_device *sdev,
 434         const unsigned char *cmd, int data_direction, void *buffer,
 435         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 436         int retries, int *resid)
 437 {
 438         return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
 439                 bufflen, sshdr, timeout, retries, resid, 0);
 440 }
 441 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 442 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 443
 444 #ifdef CONFIG_PM
 445 extern int scsi_autopm_get_device(struct scsi_device *);
 446 extern void scsi_autopm_put_device(struct scsi_device *);
 447 #else
 448 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 449 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 450 #endif /* CONFIG_PM */
 451
 452 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 453 {
 454         return device_reprobe(&sdev->sdev_gendev);
 455 }
 456
 457 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 458 {
 459         return sdev->channel;
 460 }
 461
 462 static inline unsigned int sdev_id(struct scsi_device *sdev)
 463 {
 464         return sdev->id;
 465 }
 466
 467 #define scmd_id(scmd) sdev_id((scmd)->device)
 468 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 469
 470 /*
 471  * checks for positions of the SCSI state machine
 472  */
 473 static inline int scsi_device_online(struct scsi_device *sdev)
 474 {
 475         return (sdev->sdev_state != SDEV_OFFLINE &&
 476                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 477                 sdev->sdev_state != SDEV_DEL);
 478 }
 479 static inline int scsi_device_blocked(struct scsi_device *sdev)
 480 {
 481         return sdev->sdev_state == SDEV_BLOCK ||
 482                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 483 }
 484 static inline int scsi_device_created(struct scsi_device *sdev)
 485 {
 486         return sdev->sdev_state == SDEV_CREATED ||
 487                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 488 }
 489
 490 /* accessor functions for the SCSI parameters */
 491 static inline int scsi_device_sync(struct scsi_device *sdev)
 492 {
 493         return sdev->sdtr;
 494 }
 495 static inline int scsi_device_wide(struct scsi_device *sdev)
 496 {
 497         return sdev->wdtr;
 498 }
 499 static inline int scsi_device_dt(struct scsi_device *sdev)
 500 {
 501         return sdev->ppr;
 502 }
 503 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 504 {
 505         if (sdev->inquiry_len < 57)
 506                 return 0;
 507         return (sdev->inquiry[56] & 0x0c) == 0x04;
 508 }
 509 static inline int scsi_device_ius(struct scsi_device *sdev)
 510 {
 511         if (sdev->inquiry_len < 57)
 512                 return 0;
 513         return sdev->inquiry[56] & 0x01;
 514 }
 515 static inline int scsi_device_qas(struct scsi_device *sdev)
 516 {
 517         if (sdev->inquiry_len < 57)
 518                 return 0;
 519         return sdev->inquiry[56] & 0x02;
 520 }
 521 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 522 {
 523         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 524 }
 525
 526 static inline int scsi_device_protection(struct scsi_device *sdev)
 527 {
 528         if (sdev->no_dif)
 529                 return 0;
 530
 531         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 532 }
 533
 534 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 535 {
 536         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 537 }
 538
 539 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 540         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 541 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 542
 543 #endif /* _SCSI_SCSI_DEVICE_H */