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_scan_mode {
  54        SCSI_SCAN_INITIAL = 0,
  55        SCSI_SCAN_RESCAN,
  56        SCSI_SCAN_MANUAL,
  57};
  58
  59enum scsi_device_event {
  60        SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  61        SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  62        SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  63        SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  64        SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  65        SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  66        SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  67
  68        SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  69        SDEV_EVT_LAST           = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,
  70
  71        SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  72};
  73
  74struct scsi_event {
  75        enum scsi_device_event  evt_type;
  76        struct list_head        node;
  77
  78        /* put union of data structures, for non-simple event types,
  79         * here
  80         */
  81};
  82
  83struct scsi_device {
  84        struct Scsi_Host *host;
  85        struct request_queue *request_queue;
  86
  87        /* the next two are protected by the host->host_lock */
  88        struct list_head    siblings;   /* list of all devices on this host */
  89        struct list_head    same_target_siblings; /* just the devices sharing same target id */
  90
  91        atomic_t device_busy;           /* commands actually active on LLDD */
  92        atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
  93
  94        spinlock_t list_lock;
  95        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  96        struct list_head starved_entry;
  97        unsigned short queue_depth;     /* How deep of a queue we want */
  98        unsigned short max_queue_depth; /* max queue depth */
  99        unsigned short last_queue_full_depth; /* These two are used by */
 100        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 101        unsigned long last_queue_full_time;     /* last queue full time */
 102        unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 103#define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 104
 105        unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 106
 107        unsigned int id, channel;
 108        u64 lun;
 109        unsigned int manufacturer;      /* Manufacturer of device, for using 
 110                                         * vendor-specific cmd's */
 111        unsigned sector_size;   /* size in bytes */
 112
 113        void *hostdata;         /* available to low-level driver */
 114        char type;
 115        char scsi_level;
 116        char inq_periph_qual;   /* PQ from INQUIRY data */      
 117        struct mutex inquiry_mutex;
 118        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 119        unsigned char * inquiry;        /* INQUIRY response data */
 120        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 121        const char * model;             /* ... after scan; point to static string */
 122        const char * rev;               /* ... "nullnullnullnull" before scan */
 123
 124#define SCSI_VPD_PG_LEN                255
 125        int vpd_pg83_len;
 126        unsigned char __rcu *vpd_pg83;
 127        int vpd_pg80_len;
 128        unsigned char __rcu *vpd_pg80;
 129        unsigned char current_tag;      /* current tag */
 130        struct scsi_target      *sdev_target;   /* used only for single_lun */
 131
 132        unsigned int    sdev_bflags; /* black/white flags as also found in
 133                                 * scsi_devinfo.[hc]. For now used only to
 134                                 * pass settings from slave_alloc to scsi
 135                                 * core. */
 136        unsigned int eh_timeout; /* Error handling timeout */
 137        unsigned removable:1;
 138        unsigned changed:1;     /* Data invalid due to media change */
 139        unsigned busy:1;        /* Used to prevent races */
 140        unsigned lockable:1;    /* Able to prevent media removal */
 141        unsigned locked:1;      /* Media removal disabled */
 142        unsigned borken:1;      /* Tell the Seagate driver to be 
 143                                 * painfully slow on this device */
 144        unsigned disconnect:1;  /* can disconnect */
 145        unsigned soft_reset:1;  /* Uses soft reset option */
 146        unsigned sdtr:1;        /* Device supports SDTR messages */
 147        unsigned wdtr:1;        /* Device supports WDTR messages */
 148        unsigned ppr:1;         /* Device supports PPR messages */
 149        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 150        unsigned simple_tags:1; /* simple queue tag messages are enabled */
 151        unsigned was_reset:1;   /* There was a bus reset on the bus for 
 152                                 * this device */
 153        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 154                                     * because we did a bus reset. */
 155        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 156        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 157        unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 158        unsigned no_write_same:1;       /* no WRITE SAME command */
 159        unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 160        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 161        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 162        unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 163        unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 164        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 165        unsigned no_start_on_add:1;     /* do not issue start on add */
 166        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 167        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 168        unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 169        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 170        unsigned select_no_atn:1;
 171        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 172        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 173        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 174        unsigned last_sector_bug:1;     /* do not use multisector accesses on
 175                                           SD_LAST_BUGGY_SECTORS */
 176        unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 177        unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 178        unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 179        unsigned security_supported:1;  /* Supports Security Protocols */
 180        unsigned is_visible:1;  /* is the device visible in sysfs */
 181        unsigned wce_default_on:1;      /* Cache is ON by default */
 182        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 183        unsigned broken_fua:1;          /* Don't set FUA bit */
 184        unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 185
 186        atomic_t disk_events_disable_depth; /* disable depth for disk events */
 187
 188        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 189        DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 190        struct list_head event_list;    /* asserted events */
 191        struct work_struct event_work;
 192
 193        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 194#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 195
 196        atomic_t iorequest_cnt;
 197        atomic_t iodone_cnt;
 198        atomic_t ioerr_cnt;
 199
 200        struct device           sdev_gendev,
 201                                sdev_dev;
 202
 203        struct execute_work     ew; /* used to get process context on put */
 204        struct work_struct      requeue_work;
 205
 206        struct scsi_device_handler *handler;
 207        void                    *handler_data;
 208
 209        unsigned char           access_state;
 210        struct mutex            state_mutex;
 211        enum scsi_device_state sdev_state;
 212        unsigned long           sdev_data[0];
 213} __attribute__((aligned(sizeof(unsigned long))));
 214
 215#define to_scsi_device(d)       \
 216        container_of(d, struct scsi_device, sdev_gendev)
 217#define class_to_sdev(d)        \
 218        container_of(d, struct scsi_device, sdev_dev)
 219#define transport_class_to_sdev(class_dev) \
 220        to_scsi_device(class_dev->parent)
 221
 222#define sdev_dbg(sdev, fmt, a...) \
 223        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 224
 225/*
 226 * like scmd_printk, but the device name is passed in
 227 * as a string pointer
 228 */
 229__printf(4, 5) void
 230sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 231                const char *, ...);
 232
 233#define sdev_printk(l, sdev, fmt, a...)                         \
 234        sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 235
 236__printf(3, 4) void
 237scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 238
 239#define scmd_dbg(scmd, fmt, a...)                                          \
 240        do {                                                               \
 241                if ((scmd)->request->rq_disk)                              \
 242                        sdev_dbg((scmd)->device, "[%s] " fmt,              \
 243                                 (scmd)->request->rq_disk->disk_name, ##a);\
 244                else                                                       \
 245                        sdev_dbg((scmd)->device, fmt, ##a);                \
 246        } while (0)
 247
 248enum scsi_target_state {
 249        STARGET_CREATED = 1,
 250        STARGET_RUNNING,
 251        STARGET_REMOVE,
 252        STARGET_CREATED_REMOVE,
 253        STARGET_DEL,
 254};
 255
 256/*
 257 * scsi_target: representation of a scsi target, for now, this is only
 258 * used for single_lun devices. If no one has active IO to the target,
 259 * starget_sdev_user is NULL, else it points to the active sdev.
 260 */
 261struct scsi_target {
 262        struct scsi_device      *starget_sdev_user;
 263        struct list_head        siblings;
 264        struct list_head        devices;
 265        struct device           dev;
 266        struct kref             reap_ref; /* last put renders target invisible */
 267        unsigned int            channel;
 268        unsigned int            id; /* target id ... replace
 269                                     * scsi_device.id eventually */
 270        unsigned int            create:1; /* signal that it needs to be added */
 271        unsigned int            single_lun:1;   /* Indicates we should only
 272                                                 * allow I/O to one of the luns
 273                                                 * for the device at a time. */
 274        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 275                                                 * means no lun present. */
 276        unsigned int            no_report_luns:1;       /* Don't use
 277                                                 * REPORT LUNS for scanning. */
 278        unsigned int            expecting_lun_change:1; /* A device has reported
 279                                                 * a 3F/0E UA, other devices on
 280                                                 * the same target will also. */
 281        /* commands actually active on LLD. */
 282        atomic_t                target_busy;
 283        atomic_t                target_blocked;
 284
 285        /*
 286         * LLDs should set this in the slave_alloc host template callout.
 287         * If set to zero then there is not limit.
 288         */
 289        unsigned int            can_queue;
 290        unsigned int            max_target_blocked;
 291#define SCSI_DEFAULT_TARGET_BLOCKED     3
 292
 293        char                    scsi_level;
 294        enum scsi_target_state  state;
 295        void                    *hostdata; /* available to low-level driver */
 296        unsigned long           starget_data[0]; /* for the transport */
 297        /* starget_data must be the last element!!!! */
 298} __attribute__((aligned(sizeof(unsigned long))));
 299
 300#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 301static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 302{
 303        return to_scsi_target(sdev->sdev_gendev.parent);
 304}
 305#define transport_class_to_starget(class_dev) \
 306        to_scsi_target(class_dev->parent)
 307
 308#define starget_printk(prefix, starget, fmt, a...)      \
 309        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 310
 311extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 312                uint, uint, u64, void *hostdata);
 313extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 314                           uint target, u64 lun);
 315extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 316extern void scsi_remove_device(struct scsi_device *);
 317extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 318void scsi_attach_vpd(struct scsi_device *sdev);
 319
 320extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 321extern int __must_check scsi_device_get(struct scsi_device *);
 322extern void scsi_device_put(struct scsi_device *);
 323extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 324                                              uint, uint, u64);
 325extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 326                                                uint, uint, u64);
 327extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 328                                                        u64);
 329extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 330                                                          u64);
 331extern void starget_for_each_device(struct scsi_target *, void *,
 332                     void (*fn)(struct scsi_device *, void *));
 333extern void __starget_for_each_device(struct scsi_target *, void *,
 334                                      void (*fn)(struct scsi_device *,
 335                                                 void *));
 336
 337/* only exposed to implement shost_for_each_device */
 338extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 339                                                  struct scsi_device *);
 340
 341/**
 342 * shost_for_each_device - iterate over all devices of a host
 343 * @sdev: the &struct scsi_device to use as a cursor
 344 * @shost: the &struct scsi_host to iterate over
 345 *
 346 * Iterator that returns each device attached to @shost.  This loop
 347 * takes a reference on each device and releases it at the end.  If
 348 * you break out of the loop, you must call scsi_device_put(sdev).
 349 */
 350#define shost_for_each_device(sdev, shost) \
 351        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 352             (sdev); \
 353             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 354
 355/**
 356 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 357 * @sdev: the &struct scsi_device to use as a cursor
 358 * @shost: the &struct scsi_host to iterate over
 359 *
 360 * Iterator that returns each device attached to @shost.  It does _not_
 361 * take a reference on the scsi_device, so the whole loop must be
 362 * protected by shost->host_lock.
 363 *
 364 * Note: The only reason to use this is because you need to access the
 365 * device list in interrupt context.  Otherwise you really want to use
 366 * shost_for_each_device instead.
 367 */
 368#define __shost_for_each_device(sdev, shost) \
 369        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 370
 371extern int scsi_change_queue_depth(struct scsi_device *, int);
 372extern int scsi_track_queue_full(struct scsi_device *, int);
 373
 374extern int scsi_set_medium_removal(struct scsi_device *, char);
 375
 376extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 377                           unsigned char *buffer, int len, int timeout,
 378                           int retries, struct scsi_mode_data *data,
 379                           struct scsi_sense_hdr *);
 380extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 381                            int modepage, unsigned char *buffer, int len,
 382                            int timeout, int retries,
 383                            struct scsi_mode_data *data,
 384                            struct scsi_sense_hdr *);
 385extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 386                                int retries, struct scsi_sense_hdr *sshdr);
 387extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 388                             int buf_len);
 389extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 390                              unsigned int len, unsigned char opcode);
 391extern int scsi_device_set_state(struct scsi_device *sdev,
 392                                 enum scsi_device_state state);
 393extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 394                                          gfp_t gfpflags);
 395extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 396extern void sdev_evt_send_simple(struct scsi_device *sdev,
 397                          enum scsi_device_event evt_type, gfp_t gfpflags);
 398extern int scsi_device_quiesce(struct scsi_device *sdev);
 399extern void scsi_device_resume(struct scsi_device *sdev);
 400extern void scsi_target_quiesce(struct scsi_target *);
 401extern void scsi_target_resume(struct scsi_target *);
 402extern void scsi_scan_target(struct device *parent, unsigned int channel,
 403                             unsigned int id, u64 lun,
 404                             enum scsi_scan_mode rescan);
 405extern void scsi_target_reap(struct scsi_target *);
 406extern void scsi_target_block(struct device *);
 407extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 408extern void scsi_remove_target(struct device *);
 409extern const char *scsi_device_state_name(enum scsi_device_state);
 410extern int scsi_is_sdev_device(const struct device *);
 411extern int scsi_is_target_device(const struct device *);
 412extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 413extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 414                        int data_direction, void *buffer, unsigned bufflen,
 415                        unsigned char *sense, struct scsi_sense_hdr *sshdr,
 416                        int timeout, int retries, u64 flags,
 417                        req_flags_t rq_flags, int *resid);
 418static inline int scsi_execute_req(struct scsi_device *sdev,
 419        const unsigned char *cmd, int data_direction, void *buffer,
 420        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 421        int retries, int *resid)
 422{
 423        return scsi_execute(sdev, cmd, data_direction, buffer,
 424                bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 425}
 426extern void sdev_disable_disk_events(struct scsi_device *sdev);
 427extern void sdev_enable_disk_events(struct scsi_device *sdev);
 428extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 429extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 430
 431#ifdef CONFIG_PM
 432extern int scsi_autopm_get_device(struct scsi_device *);
 433extern void scsi_autopm_put_device(struct scsi_device *);
 434#else
 435static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 436static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 437#endif /* CONFIG_PM */
 438
 439static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 440{
 441        return device_reprobe(&sdev->sdev_gendev);
 442}
 443
 444static inline unsigned int sdev_channel(struct scsi_device *sdev)
 445{
 446        return sdev->channel;
 447}
 448
 449static inline unsigned int sdev_id(struct scsi_device *sdev)
 450{
 451        return sdev->id;
 452}
 453
 454#define scmd_id(scmd) sdev_id((scmd)->device)
 455#define scmd_channel(scmd) sdev_channel((scmd)->device)
 456
 457/*
 458 * checks for positions of the SCSI state machine
 459 */
 460static inline int scsi_device_online(struct scsi_device *sdev)
 461{
 462        return (sdev->sdev_state != SDEV_OFFLINE &&
 463                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 464                sdev->sdev_state != SDEV_DEL);
 465}
 466static inline int scsi_device_blocked(struct scsi_device *sdev)
 467{
 468        return sdev->sdev_state == SDEV_BLOCK ||
 469                sdev->sdev_state == SDEV_CREATED_BLOCK;
 470}
 471static inline int scsi_device_created(struct scsi_device *sdev)
 472{
 473        return sdev->sdev_state == SDEV_CREATED ||
 474                sdev->sdev_state == SDEV_CREATED_BLOCK;
 475}
 476
 477int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 478int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 479                                        enum scsi_device_state new_state);
 480
 481/* accessor functions for the SCSI parameters */
 482static inline int scsi_device_sync(struct scsi_device *sdev)
 483{
 484        return sdev->sdtr;
 485}
 486static inline int scsi_device_wide(struct scsi_device *sdev)
 487{
 488        return sdev->wdtr;
 489}
 490static inline int scsi_device_dt(struct scsi_device *sdev)
 491{
 492        return sdev->ppr;
 493}
 494static inline int scsi_device_dt_only(struct scsi_device *sdev)
 495{
 496        if (sdev->inquiry_len < 57)
 497                return 0;
 498        return (sdev->inquiry[56] & 0x0c) == 0x04;
 499}
 500static inline int scsi_device_ius(struct scsi_device *sdev)
 501{
 502        if (sdev->inquiry_len < 57)
 503                return 0;
 504        return sdev->inquiry[56] & 0x01;
 505}
 506static inline int scsi_device_qas(struct scsi_device *sdev)
 507{
 508        if (sdev->inquiry_len < 57)
 509                return 0;
 510        return sdev->inquiry[56] & 0x02;
 511}
 512static inline int scsi_device_enclosure(struct scsi_device *sdev)
 513{
 514        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 515}
 516
 517static inline int scsi_device_protection(struct scsi_device *sdev)
 518{
 519        if (sdev->no_dif)
 520                return 0;
 521
 522        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 523}
 524
 525static inline int scsi_device_tpgs(struct scsi_device *sdev)
 526{
 527        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 528}
 529
 530/**
 531 * scsi_device_supports_vpd - test if a device supports VPD pages
 532 * @sdev: the &struct scsi_device to test
 533 *
 534 * If the 'try_vpd_pages' flag is set it takes precedence.
 535 * Otherwise we will assume VPD pages are supported if the
 536 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 537 */
 538static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 539{
 540        /* Attempt VPD inquiry if the device blacklist explicitly calls
 541         * for it.
 542         */
 543        if (sdev->try_vpd_pages)
 544                return 1;
 545        /*
 546         * Although VPD inquiries can go to SCSI-2 type devices,
 547         * some USB ones crash on receiving them, and the pages
 548         * we currently ask for are mandatory for SPC-2 and beyond
 549         */
 550        if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 551                return 1;
 552        return 0;
 553}
 554
 555#define MODULE_ALIAS_SCSI_DEVICE(type) \
 556        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 557#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 558
 559#endif /* _SCSI_SCSI_DEVICE_H */
 560