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