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         SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  61
  62         SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  63         SDEV_EVT_LAST           = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,
  64
  65         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  66 };
  67
  68 struct scsi_event {
  69         enum scsi_device_event  evt_type;
  70         struct list_head        node;
  71
  72         /* put union of data structures, for non-simple event types,
  73          * here
  74          */
  75 };
  76
  77 struct scsi_device {
  78         struct Scsi_Host *host;
  79         struct request_queue *request_queue;
  80
  81         /* the next two are protected by the host->host_lock */
  82         struct list_head    siblings;   /* list of all devices on this host */
  83         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  84
  85         atomic_t device_busy;           /* commands actually active on LLDD */
  86         atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
  87
  88         spinlock_t list_lock;
  89         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  90         struct list_head starved_entry;
  91         struct scsi_cmnd *current_cmnd; /* currently active command */
  92         unsigned short queue_depth;     /* How deep of a queue we want */
  93         unsigned short max_queue_depth; /* max queue depth */
  94         unsigned short last_queue_full_depth; /* These two are used by */
  95         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  96         unsigned long last_queue_full_time;     /* last queue full time */
  97         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
  98 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
  99
 100         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 101
 102         unsigned int id, channel;
 103         u64 lun;
 104         unsigned int manufacturer;      /* Manufacturer of device, for using
 105                                          * vendor-specific cmd's */
 106         unsigned sector_size;   /* size in bytes */
 107
 108         void *hostdata;         /* available to low-level driver */
 109         char type;
 110         char scsi_level;
 111         char inq_periph_qual;   /* PQ from INQUIRY data */
 112         struct mutex inquiry_mutex;
 113         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 114         unsigned char * inquiry;        /* INQUIRY response data */
 115         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 116         const char * model;             /* ... after scan; point to static string */
 117         const char * rev;               /* ... "nullnullnullnull" before scan */
 118
 119 #define SCSI_VPD_PG_LEN                255
 120         int vpd_pg83_len;
 121         unsigned char __rcu *vpd_pg83;
 122         int vpd_pg80_len;
 123         unsigned char __rcu *vpd_pg80;
 124         unsigned char current_tag;      /* current tag */
 125         struct scsi_target      *sdev_target;   /* used only for single_lun */
 126
 127         unsigned int    sdev_bflags; /* black/white flags as also found in
 128                                  * scsi_devinfo.[hc]. For now used only to
 129                                  * pass settings from slave_alloc to scsi
 130                                  * core. */
 131         unsigned int eh_timeout; /* Error handling timeout */
 132         unsigned removable:1;
 133         unsigned changed:1;     /* Data invalid due to media change */
 134         unsigned busy:1;        /* Used to prevent races */
 135         unsigned lockable:1;    /* Able to prevent media removal */
 136         unsigned locked:1;      /* Media removal disabled */
 137         unsigned borken:1;      /* Tell the Seagate driver to be
 138                                  * painfully slow on this device */
 139         unsigned disconnect:1;  /* can disconnect */
 140         unsigned soft_reset:1;  /* Uses soft reset option */
 141         unsigned sdtr:1;        /* Device supports SDTR messages */
 142         unsigned wdtr:1;        /* Device supports WDTR messages */
 143         unsigned ppr:1;         /* Device supports PPR messages */
 144         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 145         unsigned simple_tags:1; /* simple 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 try_vpd_pages:1;       /* attempt to read VPD pages */
 159         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 160         unsigned no_start_on_add:1;     /* do not issue start on add */
 161         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 162         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 163         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 164         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 165         unsigned select_no_atn:1;
 166         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 167         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 168         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 169         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 170                                            SD_LAST_BUGGY_SECTORS */
 171         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 172         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 173         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 174         unsigned is_visible:1;  /* is the device visible in sysfs */
 175         unsigned wce_default_on:1;      /* Cache is ON by default */
 176         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 177         unsigned broken_fua:1;          /* Don't set FUA bit */
 178         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 179
 180         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 181
 182         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 183         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 184         struct list_head event_list;    /* asserted events */
 185         struct work_struct event_work;
 186
 187         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 188 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 189
 190         atomic_t iorequest_cnt;
 191         atomic_t iodone_cnt;
 192         atomic_t ioerr_cnt;
 193
 194         struct device           sdev_gendev,
 195                                 sdev_dev;
 196
 197         struct execute_work     ew; /* used to get process context on put */
 198         struct work_struct      requeue_work;
 199
 200         struct scsi_device_handler *handler;
 201         void                    *handler_data;
 202
 203         enum scsi_device_state sdev_state;
 204         unsigned long           sdev_data[0];
 205 } __attribute__((aligned(sizeof(unsigned long))));
 206
 207 #define to_scsi_device(d)       \
 208         container_of(d, struct scsi_device, sdev_gendev)
 209 #define class_to_sdev(d)        \
 210         container_of(d, struct scsi_device, sdev_dev)
 211 #define transport_class_to_sdev(class_dev) \
 212         to_scsi_device(class_dev->parent)
 213
 214 #define sdev_dbg(sdev, fmt, a...) \
 215         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 216
 217 /*
 218  * like scmd_printk, but the device name is passed in
 219  * as a string pointer
 220  */
 221 __printf(4, 5) void
 222 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 223                 const char *, ...);
 224
 225 #define sdev_printk(l, sdev, fmt, a...)                         \
 226         sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 227
 228 __printf(3, 4) void
 229 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 230
 231 #define scmd_dbg(scmd, fmt, a...)                                          \
 232         do {                                                               \
 233                 if ((scmd)->request->rq_disk)                              \
 234                         sdev_dbg((scmd)->device, "[%s] " fmt,              \
 235                                  (scmd)->request->rq_disk->disk_name, ##a);\
 236                 else                                                       \
 237                         sdev_dbg((scmd)->device, fmt, ##a);                \
 238         } while (0)
 239
 240 enum scsi_target_state {
 241         STARGET_CREATED = 1,
 242         STARGET_RUNNING,
 243         STARGET_DEL,
 244 };
 245
 246 /*
 247  * scsi_target: representation of a scsi target, for now, this is only
 248  * used for single_lun devices. If no one has active IO to the target,
 249  * starget_sdev_user is NULL, else it points to the active sdev.
 250  */
 251 struct scsi_target {
 252         struct scsi_device      *starget_sdev_user;
 253         struct list_head        siblings;
 254         struct list_head        devices;
 255         struct device           dev;
 256         struct kref             reap_ref; /* last put renders target invisible */
 257         unsigned int            channel;
 258         unsigned int            id; /* target id ... replace
 259                                      * scsi_device.id eventually */
 260         unsigned int            create:1; /* signal that it needs to be added */
 261         unsigned int            single_lun:1;   /* Indicates we should only
 262                                                  * allow I/O to one of the luns
 263                                                  * for the device at a time. */
 264         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 265                                                  * means no lun present. */
 266         unsigned int            no_report_luns:1;       /* Don't use
 267                                                  * REPORT LUNS for scanning. */
 268         unsigned int            expecting_lun_change:1; /* A device has reported
 269                                                  * a 3F/0E UA, other devices on
 270                                                  * the same target will also. */
 271         /* commands actually active on LLD. */
 272         atomic_t                target_busy;
 273         atomic_t                target_blocked;
 274
 275         /*
 276          * LLDs should set this in the slave_alloc host template callout.
 277          * If set to zero then there is not limit.
 278          */
 279         unsigned int            can_queue;
 280         unsigned int            max_target_blocked;
 281 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 282
 283         char                    scsi_level;
 284         enum scsi_target_state  state;
 285         void                    *hostdata; /* available to low-level driver */
 286         unsigned long           starget_data[0]; /* for the transport */
 287         /* starget_data must be the last element!!!! */
 288 } __attribute__((aligned(sizeof(unsigned long))));
 289
 290 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 291 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 292 {
 293         return to_scsi_target(sdev->sdev_gendev.parent);
 294 }
 295 #define transport_class_to_starget(class_dev) \
 296         to_scsi_target(class_dev->parent)
 297
 298 #define starget_printk(prefix, starget, fmt, a...)      \
 299         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 300
 301 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 302                 uint, uint, u64, void *hostdata);
 303 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 304                            uint target, u64 lun);
 305 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 306 extern void scsi_remove_device(struct scsi_device *);
 307 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 308 void scsi_attach_vpd(struct scsi_device *sdev);
 309
 310 extern int scsi_device_get(struct scsi_device *);
 311 extern void scsi_device_put(struct scsi_device *);
 312 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 313                                               uint, uint, u64);
 314 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 315                                                 uint, uint, u64);
 316 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 317                                                         u64);
 318 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 319                                                           u64);
 320 extern void starget_for_each_device(struct scsi_target *, void *,
 321                      void (*fn)(struct scsi_device *, void *));
 322 extern void __starget_for_each_device(struct scsi_target *, void *,
 323                                       void (*fn)(struct scsi_device *,
 324                                                  void *));
 325
 326 /* only exposed to implement shost_for_each_device */
 327 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 328                                                   struct scsi_device *);
 329
 330 /**
 331  * shost_for_each_device - iterate over all devices of a host
 332  * @sdev: the &struct scsi_device to use as a cursor
 333  * @shost: the &struct scsi_host to iterate over
 334  *
 335  * Iterator that returns each device attached to @shost.  This loop
 336  * takes a reference on each device and releases it at the end.  If
 337  * you break out of the loop, you must call scsi_device_put(sdev).
 338  */
 339 #define shost_for_each_device(sdev, shost) \
 340         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 341              (sdev); \
 342              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 343
 344 /**
 345  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 346  * @sdev: the &struct scsi_device to use as a cursor
 347  * @shost: the &struct scsi_host to iterate over
 348  *
 349  * Iterator that returns each device attached to @shost.  It does _not_
 350  * take a reference on the scsi_device, so the whole loop must be
 351  * protected by shost->host_lock.
 352  *
 353  * Note: The only reason to use this is because you need to access the
 354  * device list in interrupt context.  Otherwise you really want to use
 355  * shost_for_each_device instead.
 356  */
 357 #define __shost_for_each_device(sdev, shost) \
 358         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 359
 360 extern int scsi_change_queue_depth(struct scsi_device *, int);
 361 extern int scsi_track_queue_full(struct scsi_device *, int);
 362
 363 extern int scsi_set_medium_removal(struct scsi_device *, char);
 364
 365 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 366                            unsigned char *buffer, int len, int timeout,
 367                            int retries, struct scsi_mode_data *data,
 368                            struct scsi_sense_hdr *);
 369 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 370                             int modepage, unsigned char *buffer, int len,
 371                             int timeout, int retries,
 372                             struct scsi_mode_data *data,
 373                             struct scsi_sense_hdr *);
 374 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 375                                 int retries, struct scsi_sense_hdr *sshdr);
 376 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 377                              int buf_len);
 378 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 379                               unsigned int len, unsigned char opcode);
 380 extern int scsi_device_set_state(struct scsi_device *sdev,
 381                                  enum scsi_device_state state);
 382 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 383                                           gfp_t gfpflags);
 384 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 385 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 386                           enum scsi_device_event evt_type, gfp_t gfpflags);
 387 extern int scsi_device_quiesce(struct scsi_device *sdev);
 388 extern void scsi_device_resume(struct scsi_device *sdev);
 389 extern void scsi_target_quiesce(struct scsi_target *);
 390 extern void scsi_target_resume(struct scsi_target *);
 391 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 392                              unsigned int id, u64 lun, int rescan);
 393 extern void scsi_target_reap(struct scsi_target *);
 394 extern void scsi_target_block(struct device *);
 395 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 396 extern void scsi_remove_target(struct device *);
 397 extern const char *scsi_device_state_name(enum scsi_device_state);
 398 extern int scsi_is_sdev_device(const struct device *);
 399 extern int scsi_is_target_device(const struct device *);
 400 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 401                         int data_direction, void *buffer, unsigned bufflen,
 402                         unsigned char *sense, int timeout, int retries,
 403                         u64 flags, int *resid);
 404 extern int scsi_execute_req_flags(struct scsi_device *sdev,
 405         const unsigned char *cmd, int data_direction, void *buffer,
 406         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 407         int retries, int *resid, u64 flags);
 408 static inline int scsi_execute_req(struct scsi_device *sdev,
 409         const unsigned char *cmd, int data_direction, void *buffer,
 410         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 411         int retries, int *resid)
 412 {
 413         return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
 414                 bufflen, sshdr, timeout, retries, resid, 0);
 415 }
 416 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 417 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 418 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 419 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 420
 421 #ifdef CONFIG_PM
 422 extern int scsi_autopm_get_device(struct scsi_device *);
 423 extern void scsi_autopm_put_device(struct scsi_device *);
 424 #else
 425 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 426 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 427 #endif /* CONFIG_PM */
 428
 429 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 430 {
 431         return device_reprobe(&sdev->sdev_gendev);
 432 }
 433
 434 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 435 {
 436         return sdev->channel;
 437 }
 438
 439 static inline unsigned int sdev_id(struct scsi_device *sdev)
 440 {
 441         return sdev->id;
 442 }
 443
 444 #define scmd_id(scmd) sdev_id((scmd)->device)
 445 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 446
 447 /*
 448  * checks for positions of the SCSI state machine
 449  */
 450 static inline int scsi_device_online(struct scsi_device *sdev)
 451 {
 452         return (sdev->sdev_state != SDEV_OFFLINE &&
 453                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 454                 sdev->sdev_state != SDEV_DEL);
 455 }
 456 static inline int scsi_device_blocked(struct scsi_device *sdev)
 457 {
 458         return sdev->sdev_state == SDEV_BLOCK ||
 459                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 460 }
 461 static inline int scsi_device_created(struct scsi_device *sdev)
 462 {
 463         return sdev->sdev_state == SDEV_CREATED ||
 464                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 465 }
 466
 467 /* accessor functions for the SCSI parameters */
 468 static inline int scsi_device_sync(struct scsi_device *sdev)
 469 {
 470         return sdev->sdtr;
 471 }
 472 static inline int scsi_device_wide(struct scsi_device *sdev)
 473 {
 474         return sdev->wdtr;
 475 }
 476 static inline int scsi_device_dt(struct scsi_device *sdev)
 477 {
 478         return sdev->ppr;
 479 }
 480 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 481 {
 482         if (sdev->inquiry_len < 57)
 483                 return 0;
 484         return (sdev->inquiry[56] & 0x0c) == 0x04;
 485 }
 486 static inline int scsi_device_ius(struct scsi_device *sdev)
 487 {
 488         if (sdev->inquiry_len < 57)
 489                 return 0;
 490         return sdev->inquiry[56] & 0x01;
 491 }
 492 static inline int scsi_device_qas(struct scsi_device *sdev)
 493 {
 494         if (sdev->inquiry_len < 57)
 495                 return 0;
 496         return sdev->inquiry[56] & 0x02;
 497 }
 498 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 499 {
 500         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 501 }
 502
 503 static inline int scsi_device_protection(struct scsi_device *sdev)
 504 {
 505         if (sdev->no_dif)
 506                 return 0;
 507
 508         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 509 }
 510
 511 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 512 {
 513         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 514 }
 515
 516 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 517         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 518 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 519
 520 #endif /* _SCSI_SCSI_DEVICE_H */