LXR linux/include/scsi/scsi

   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
  11struct device;
  12struct request_queue;
  13struct scsi_cmnd;
  14struct scsi_lun;
  15struct scsi_sense_hdr;
  16
  17struct 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 */
  31enum 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
  53enum 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
  67struct 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
  76struct 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
 203typedef void (*activate_complete)(void *, int);
 204struct 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
 220struct 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_dbg(sdev, fmt, a...) \
 234        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 235
 236/*
 237 * like scmd_printk, but the device name is passed in
 238 * as a string pointer
 239 */
 240__printf(4, 5) void
 241sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 242                const char *, ...);
 243
 244#define sdev_printk(l, sdev, fmt, a...)                         \
 245        sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 246
 247__printf(3, 4) void
 248scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 249
 250#define scmd_dbg(scmd, fmt, a...)                                          \
 251        do {                                                               \
 252                if ((scmd)->request->rq_disk)                              \
 253                        sdev_dbg((scmd)->device, "[%s] " fmt,              \
 254                                 (scmd)->request->rq_disk->disk_name, ##a);\
 255                else                                                       \
 256                        sdev_dbg((scmd)->device, fmt, ##a);                \
 257        } while (0)
 258
 259enum scsi_target_state {
 260        STARGET_CREATED = 1,
 261        STARGET_RUNNING,
 262        STARGET_DEL,
 263};
 264
 265/*
 266 * scsi_target: representation of a scsi target, for now, this is only
 267 * used for single_lun devices. If no one has active IO to the target,
 268 * starget_sdev_user is NULL, else it points to the active sdev.
 269 */
 270struct scsi_target {
 271        struct scsi_device      *starget_sdev_user;
 272        struct list_head        siblings;
 273        struct list_head        devices;
 274        struct device           dev;
 275        struct kref             reap_ref; /* last put renders target invisible */
 276        unsigned int            channel;
 277        unsigned int            id; /* target id ... replace
 278                                     * scsi_device.id eventually */
 279        unsigned int            create:1; /* signal that it needs to be added */
 280        unsigned int            single_lun:1;   /* Indicates we should only
 281                                                 * allow I/O to one of the luns
 282                                                 * for the device at a time. */
 283        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 284                                                 * means no lun present. */
 285        unsigned int            no_report_luns:1;       /* Don't use
 286                                                 * REPORT LUNS for scanning. */
 287        unsigned int            expecting_lun_change:1; /* A device has reported
 288                                                 * a 3F/0E UA, other devices on
 289                                                 * the same target will also. */
 290        /* commands actually active on LLD. */
 291        atomic_t                target_busy;
 292        atomic_t                target_blocked;
 293
 294        /*
 295         * LLDs should set this in the slave_alloc host template callout.
 296         * If set to zero then there is not limit.
 297         */
 298        unsigned int            can_queue;
 299        unsigned int            max_target_blocked;
 300#define SCSI_DEFAULT_TARGET_BLOCKED     3
 301
 302        char                    scsi_level;
 303        enum scsi_target_state  state;
 304        void                    *hostdata; /* available to low-level driver */
 305        unsigned long           starget_data[0]; /* for the transport */
 306        /* starget_data must be the last element!!!! */
 307} __attribute__((aligned(sizeof(unsigned long))));
 308
 309#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 310static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 311{
 312        return to_scsi_target(sdev->sdev_gendev.parent);
 313}
 314#define transport_class_to_starget(class_dev) \
 315        to_scsi_target(class_dev->parent)
 316
 317#define starget_printk(prefix, starget, fmt, a...)      \
 318        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 319
 320extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 321                uint, uint, u64, void *hostdata);
 322extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 323                           uint target, u64 lun);
 324extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 325extern void scsi_remove_device(struct scsi_device *);
 326extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 327void scsi_attach_vpd(struct scsi_device *sdev);
 328
 329extern int scsi_device_get(struct scsi_device *);
 330extern void scsi_device_put(struct scsi_device *);
 331extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 332                                              uint, uint, u64);
 333extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 334                                                uint, uint, u64);
 335extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 336                                                        u64);
 337extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 338                                                          u64);
 339extern void starget_for_each_device(struct scsi_target *, void *,
 340                     void (*fn)(struct scsi_device *, void *));
 341extern void __starget_for_each_device(struct scsi_target *, void *,
 342                                      void (*fn)(struct scsi_device *,
 343                                                 void *));
 344
 345/* only exposed to implement shost_for_each_device */
 346extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 347                                                  struct scsi_device *);
 348
 349/**
 350 * shost_for_each_device - iterate over all devices of a host
 351 * @sdev: the &struct scsi_device to use as a cursor
 352 * @shost: the &struct scsi_host to iterate over
 353 *
 354 * Iterator that returns each device attached to @shost.  This loop
 355 * takes a reference on each device and releases it at the end.  If
 356 * you break out of the loop, you must call scsi_device_put(sdev).
 357 */
 358#define shost_for_each_device(sdev, shost) \
 359        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 360             (sdev); \
 361             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 362
 363/**
 364 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 365 * @sdev: the &struct scsi_device to use as a cursor
 366 * @shost: the &struct scsi_host to iterate over
 367 *
 368 * Iterator that returns each device attached to @shost.  It does _not_
 369 * take a reference on the scsi_device, so the whole loop must be
 370 * protected by shost->host_lock.
 371 *
 372 * Note: The only reason to use this is because you need to access the
 373 * device list in interrupt context.  Otherwise you really want to use
 374 * shost_for_each_device instead.
 375 */
 376#define __shost_for_each_device(sdev, shost) \
 377        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 378
 379extern int scsi_change_queue_depth(struct scsi_device *, int);
 380extern int scsi_track_queue_full(struct scsi_device *, int);
 381
 382extern int scsi_set_medium_removal(struct scsi_device *, char);
 383
 384extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 385                           unsigned char *buffer, int len, int timeout,
 386                           int retries, struct scsi_mode_data *data,
 387                           struct scsi_sense_hdr *);
 388extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 389                            int modepage, unsigned char *buffer, int len,
 390                            int timeout, int retries,
 391                            struct scsi_mode_data *data,
 392                            struct scsi_sense_hdr *);
 393extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 394                                int retries, struct scsi_sense_hdr *sshdr);
 395extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 396                             int buf_len);
 397extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 398                              unsigned int len, unsigned char opcode);
 399extern int scsi_device_set_state(struct scsi_device *sdev,
 400                                 enum scsi_device_state state);
 401extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 402                                          gfp_t gfpflags);
 403extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 404extern void sdev_evt_send_simple(struct scsi_device *sdev,
 405                          enum scsi_device_event evt_type, gfp_t gfpflags);
 406extern int scsi_device_quiesce(struct scsi_device *sdev);
 407extern void scsi_device_resume(struct scsi_device *sdev);
 408extern void scsi_target_quiesce(struct scsi_target *);
 409extern void scsi_target_resume(struct scsi_target *);
 410extern void scsi_scan_target(struct device *parent, unsigned int channel,
 411                             unsigned int id, u64 lun, int rescan);
 412extern void scsi_target_reap(struct scsi_target *);
 413extern void scsi_target_block(struct device *);
 414extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 415extern void scsi_remove_target(struct device *);
 416extern const char *scsi_device_state_name(enum scsi_device_state);
 417extern int scsi_is_sdev_device(const struct device *);
 418extern int scsi_is_target_device(const struct device *);
 419extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 420                        int data_direction, void *buffer, unsigned bufflen,
 421                        unsigned char *sense, int timeout, int retries,
 422                        u64 flags, int *resid);
 423extern int scsi_execute_req_flags(struct scsi_device *sdev,
 424        const unsigned char *cmd, int data_direction, void *buffer,
 425        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 426        int retries, int *resid, u64 flags);
 427static inline int scsi_execute_req(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)
 431{
 432        return scsi_execute_req_flags(sdev, cmd, data_direction, buffer,
 433                bufflen, sshdr, timeout, retries, resid, 0);
 434}
 435extern void sdev_disable_disk_events(struct scsi_device *sdev);
 436extern void sdev_enable_disk_events(struct scsi_device *sdev);
 437
 438#ifdef CONFIG_PM
 439extern int scsi_autopm_get_device(struct scsi_device *);
 440extern void scsi_autopm_put_device(struct scsi_device *);
 441#else
 442static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 443static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 444#endif /* CONFIG_PM */
 445
 446static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 447{
 448        return device_reprobe(&sdev->sdev_gendev);
 449}
 450
 451static inline unsigned int sdev_channel(struct scsi_device *sdev)
 452{
 453        return sdev->channel;
 454}
 455
 456static inline unsigned int sdev_id(struct scsi_device *sdev)
 457{
 458        return sdev->id;
 459}
 460
 461#define scmd_id(scmd) sdev_id((scmd)->device)
 462#define scmd_channel(scmd) sdev_channel((scmd)->device)
 463
 464/*
 465 * checks for positions of the SCSI state machine
 466 */
 467static inline int scsi_device_online(struct scsi_device *sdev)
 468{
 469        return (sdev->sdev_state != SDEV_OFFLINE &&
 470                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 471                sdev->sdev_state != SDEV_DEL);
 472}
 473static inline int scsi_device_blocked(struct scsi_device *sdev)
 474{
 475        return sdev->sdev_state == SDEV_BLOCK ||
 476                sdev->sdev_state == SDEV_CREATED_BLOCK;
 477}
 478static inline int scsi_device_created(struct scsi_device *sdev)
 479{
 480        return sdev->sdev_state == SDEV_CREATED ||
 481                sdev->sdev_state == SDEV_CREATED_BLOCK;
 482}
 483
 484/* accessor functions for the SCSI parameters */
 485static inline int scsi_device_sync(struct scsi_device *sdev)
 486{
 487        return sdev->sdtr;
 488}
 489static inline int scsi_device_wide(struct scsi_device *sdev)
 490{
 491        return sdev->wdtr;
 492}
 493static inline int scsi_device_dt(struct scsi_device *sdev)
 494{
 495        return sdev->ppr;
 496}
 497static inline int scsi_device_dt_only(struct scsi_device *sdev)
 498{
 499        if (sdev->inquiry_len < 57)
 500                return 0;
 501        return (sdev->inquiry[56] & 0x0c) == 0x04;
 502}
 503static inline int scsi_device_ius(struct scsi_device *sdev)
 504{
 505        if (sdev->inquiry_len < 57)
 506                return 0;
 507        return sdev->inquiry[56] & 0x01;
 508}
 509static inline int scsi_device_qas(struct scsi_device *sdev)
 510{
 511        if (sdev->inquiry_len < 57)
 512                return 0;
 513        return sdev->inquiry[56] & 0x02;
 514}
 515static inline int scsi_device_enclosure(struct scsi_device *sdev)
 516{
 517        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 518}
 519
 520static inline int scsi_device_protection(struct scsi_device *sdev)
 521{
 522        if (sdev->no_dif)
 523                return 0;
 524
 525        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 526}
 527
 528static inline int scsi_device_tpgs(struct scsi_device *sdev)
 529{
 530        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 531}
 532
 533#define MODULE_ALIAS_SCSI_DEVICE(type) \
 534        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 535#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 536
 537#endif /* _SCSI_SCSI_DEVICE_H */
 538