LXR linux/include/scsi/scsi

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _SCSI_SCSI_DEVICE_H
   3#define _SCSI_SCSI_DEVICE_H
   4
   5#include <linux/list.h>
   6#include <linux/spinlock.h>
   7#include <linux/workqueue.h>
   8#include <linux/blkdev.h>
   9#include <scsi/scsi.h>
  10#include <linux/atomic.h>
  11
  12struct device;
  13struct request_queue;
  14struct scsi_cmnd;
  15struct scsi_lun;
  16struct scsi_sense_hdr;
  17
  18struct scsi_mode_data {
  19        __u32   length;
  20        __u16   block_descriptor_length;
  21        __u8    medium_type;
  22        __u8    device_specific;
  23        __u8    header_length;
  24        __u8    longlba:1;
  25};
  26
  27/*
  28 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  29 * (for the ascii descriptions) and the state model enforcer:
  30 * scsi_lib:scsi_device_set_state().
  31 */
  32enum scsi_device_state {
  33        SDEV_CREATED = 1,       /* device created but not added to sysfs
  34                                 * Only internal commands allowed (for inq) */
  35        SDEV_RUNNING,           /* device properly configured
  36                                 * All commands allowed */
  37        SDEV_CANCEL,            /* beginning to delete device
  38                                 * Only error handler commands allowed */
  39        SDEV_DEL,               /* device deleted 
  40                                 * no commands allowed */
  41        SDEV_QUIESCE,           /* Device quiescent.  No block commands
  42                                 * will be accepted, only specials (which
  43                                 * originate in the mid-layer) */
  44        SDEV_OFFLINE,           /* Device offlined (by error handling or
  45                                 * user request */
  46        SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  47        SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  48                                 * scsi commands from user or midlayer
  49                                 * should be issued to the scsi
  50                                 * lld. */
  51        SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  52};
  53
  54enum scsi_scan_mode {
  55        SCSI_SCAN_INITIAL = 0,
  56        SCSI_SCAN_RESCAN,
  57        SCSI_SCAN_MANUAL,
  58};
  59
  60enum scsi_device_event {
  61        SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  62        SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  63        SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  64        SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  65        SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  66        SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  67        SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  68
  69        SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  70        SDEV_EVT_LAST           = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,
  71
  72        SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  73};
  74
  75struct scsi_event {
  76        enum scsi_device_event  evt_type;
  77        struct list_head        node;
  78
  79        /* put union of data structures, for non-simple event types,
  80         * here
  81         */
  82};
  83
  84/**
  85 * struct scsi_vpd - SCSI Vital Product Data
  86 * @rcu: For kfree_rcu().
  87 * @len: Length in bytes of @data.
  88 * @data: VPD data as defined in various T10 SCSI standard documents.
  89 */
  90struct scsi_vpd {
  91        struct rcu_head rcu;
  92        int             len;
  93        unsigned char   data[];
  94};
  95
  96struct scsi_device {
  97        struct Scsi_Host *host;
  98        struct request_queue *request_queue;
  99
 100        /* the next two are protected by the host->host_lock */
 101        struct list_head    siblings;   /* list of all devices on this host */
 102        struct list_head    same_target_siblings; /* just the devices sharing same target id */
 103
 104        atomic_t device_busy;           /* commands actually active on LLDD */
 105        atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 106
 107        spinlock_t list_lock;
 108        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
 109        struct list_head starved_entry;
 110        unsigned short queue_depth;     /* How deep of a queue we want */
 111        unsigned short max_queue_depth; /* max queue depth */
 112        unsigned short last_queue_full_depth; /* These two are used by */
 113        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 114        unsigned long last_queue_full_time;     /* last queue full time */
 115        unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 116#define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 117
 118        unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 119
 120        unsigned int id, channel;
 121        u64 lun;
 122        unsigned int manufacturer;      /* Manufacturer of device, for using 
 123                                         * vendor-specific cmd's */
 124        unsigned sector_size;   /* size in bytes */
 125
 126        void *hostdata;         /* available to low-level driver */
 127        unsigned char type;
 128        char scsi_level;
 129        char inq_periph_qual;   /* PQ from INQUIRY data */      
 130        struct mutex inquiry_mutex;
 131        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 132        unsigned char * inquiry;        /* INQUIRY response data */
 133        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 134        const char * model;             /* ... after scan; point to static string */
 135        const char * rev;               /* ... "nullnullnullnull" before scan */
 136
 137#define SCSI_VPD_PG_LEN                255
 138        struct scsi_vpd __rcu *vpd_pg83;
 139        struct scsi_vpd __rcu *vpd_pg80;
 140        unsigned char current_tag;      /* current tag */
 141        struct scsi_target      *sdev_target;   /* used only for single_lun */
 142
 143        unsigned int    sdev_bflags; /* black/white flags as also found in
 144                                 * scsi_devinfo.[hc]. For now used only to
 145                                 * pass settings from slave_alloc to scsi
 146                                 * core. */
 147        unsigned int eh_timeout; /* Error handling timeout */
 148        unsigned removable:1;
 149        unsigned changed:1;     /* Data invalid due to media change */
 150        unsigned busy:1;        /* Used to prevent races */
 151        unsigned lockable:1;    /* Able to prevent media removal */
 152        unsigned locked:1;      /* Media removal disabled */
 153        unsigned borken:1;      /* Tell the Seagate driver to be 
 154                                 * painfully slow on this device */
 155        unsigned disconnect:1;  /* can disconnect */
 156        unsigned soft_reset:1;  /* Uses soft reset option */
 157        unsigned sdtr:1;        /* Device supports SDTR messages */
 158        unsigned wdtr:1;        /* Device supports WDTR messages */
 159        unsigned ppr:1;         /* Device supports PPR messages */
 160        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 161        unsigned simple_tags:1; /* simple queue tag messages are enabled */
 162        unsigned was_reset:1;   /* There was a bus reset on the bus for 
 163                                 * this device */
 164        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 165                                     * because we did a bus reset. */
 166        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 167        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 168        unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 169        unsigned no_write_same:1;       /* no WRITE SAME command */
 170        unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 171        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 172        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 173        unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 174        unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 175        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 176        unsigned no_start_on_add:1;     /* do not issue start on add */
 177        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 178        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 179        unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 180        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 181        unsigned select_no_atn:1;
 182        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 183        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 184        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 185        unsigned last_sector_bug:1;     /* do not use multisector accesses on
 186                                           SD_LAST_BUGGY_SECTORS */
 187        unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 188        unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 189        unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 190        unsigned security_supported:1;  /* Supports Security Protocols */
 191        unsigned is_visible:1;  /* is the device visible in sysfs */
 192        unsigned wce_default_on:1;      /* Cache is ON by default */
 193        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 194        unsigned broken_fua:1;          /* Don't set FUA bit */
 195        unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 196        unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 197
 198        atomic_t disk_events_disable_depth; /* disable depth for disk events */
 199
 200        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 201        DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 202        struct list_head event_list;    /* asserted events */
 203        struct work_struct event_work;
 204
 205        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 206#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 207
 208        atomic_t iorequest_cnt;
 209        atomic_t iodone_cnt;
 210        atomic_t ioerr_cnt;
 211
 212        struct device           sdev_gendev,
 213                                sdev_dev;
 214
 215        struct execute_work     ew; /* used to get process context on put */
 216        struct work_struct      requeue_work;
 217
 218        struct scsi_device_handler *handler;
 219        void                    *handler_data;
 220
 221        unsigned char           access_state;
 222        struct mutex            state_mutex;
 223        enum scsi_device_state sdev_state;
 224        unsigned long           sdev_data[0];
 225} __attribute__((aligned(sizeof(unsigned long))));
 226
 227#define to_scsi_device(d)       \
 228        container_of(d, struct scsi_device, sdev_gendev)
 229#define class_to_sdev(d)        \
 230        container_of(d, struct scsi_device, sdev_dev)
 231#define transport_class_to_sdev(class_dev) \
 232        to_scsi_device(class_dev->parent)
 233
 234#define sdev_dbg(sdev, fmt, a...) \
 235        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 236
 237/*
 238 * like scmd_printk, but the device name is passed in
 239 * as a string pointer
 240 */
 241__printf(4, 5) void
 242sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 243                const char *, ...);
 244
 245#define sdev_printk(l, sdev, fmt, a...)                         \
 246        sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 247
 248__printf(3, 4) void
 249scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 250
 251#define scmd_dbg(scmd, fmt, a...)                                          \
 252        do {                                                               \
 253                if ((scmd)->request->rq_disk)                              \
 254                        sdev_dbg((scmd)->device, "[%s] " fmt,              \
 255                                 (scmd)->request->rq_disk->disk_name, ##a);\
 256                else                                                       \
 257                        sdev_dbg((scmd)->device, fmt, ##a);                \
 258        } while (0)
 259
 260enum scsi_target_state {
 261        STARGET_CREATED = 1,
 262        STARGET_RUNNING,
 263        STARGET_REMOVE,
 264        STARGET_CREATED_REMOVE,
 265        STARGET_DEL,
 266};
 267
 268/*
 269 * scsi_target: representation of a scsi target, for now, this is only
 270 * used for single_lun devices. If no one has active IO to the target,
 271 * starget_sdev_user is NULL, else it points to the active sdev.
 272 */
 273struct scsi_target {
 274        struct scsi_device      *starget_sdev_user;
 275        struct list_head        siblings;
 276        struct list_head        devices;
 277        struct device           dev;
 278        struct kref             reap_ref; /* last put renders target invisible */
 279        unsigned int            channel;
 280        unsigned int            id; /* target id ... replace
 281                                     * scsi_device.id eventually */
 282        unsigned int            create:1; /* signal that it needs to be added */
 283        unsigned int            single_lun:1;   /* Indicates we should only
 284                                                 * allow I/O to one of the luns
 285                                                 * for the device at a time. */
 286        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 287                                                 * means no lun present. */
 288        unsigned int            no_report_luns:1;       /* Don't use
 289                                                 * REPORT LUNS for scanning. */
 290        unsigned int            expecting_lun_change:1; /* A device has reported
 291                                                 * a 3F/0E UA, other devices on
 292                                                 * the same target will also. */
 293        /* commands actually active on LLD. */
 294        atomic_t                target_busy;
 295        atomic_t                target_blocked;
 296
 297        /*
 298         * LLDs should set this in the slave_alloc host template callout.
 299         * If set to zero then there is not limit.
 300         */
 301        unsigned int            can_queue;
 302        unsigned int            max_target_blocked;
 303#define SCSI_DEFAULT_TARGET_BLOCKED     3
 304
 305        char                    scsi_level;
 306        enum scsi_target_state  state;
 307        void                    *hostdata; /* available to low-level driver */
 308        unsigned long           starget_data[0]; /* for the transport */
 309        /* starget_data must be the last element!!!! */
 310} __attribute__((aligned(sizeof(unsigned long))));
 311
 312#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 313static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 314{
 315        return to_scsi_target(sdev->sdev_gendev.parent);
 316}
 317#define transport_class_to_starget(class_dev) \
 318        to_scsi_target(class_dev->parent)
 319
 320#define starget_printk(prefix, starget, fmt, a...)      \
 321        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 322
 323extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 324                uint, uint, u64, void *hostdata);
 325extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 326                           uint target, u64 lun);
 327extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 328extern void scsi_remove_device(struct scsi_device *);
 329extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 330void scsi_attach_vpd(struct scsi_device *sdev);
 331
 332extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 333extern int __must_check scsi_device_get(struct scsi_device *);
 334extern void scsi_device_put(struct scsi_device *);
 335extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 336                                              uint, uint, u64);
 337extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 338                                                uint, uint, u64);
 339extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 340                                                        u64);
 341extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 342                                                          u64);
 343extern void starget_for_each_device(struct scsi_target *, void *,
 344                     void (*fn)(struct scsi_device *, void *));
 345extern void __starget_for_each_device(struct scsi_target *, void *,
 346                                      void (*fn)(struct scsi_device *,
 347                                                 void *));
 348
 349/* only exposed to implement shost_for_each_device */
 350extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 351                                                  struct scsi_device *);
 352
 353/**
 354 * shost_for_each_device - iterate over all devices of a host
 355 * @sdev: the &struct scsi_device to use as a cursor
 356 * @shost: the &struct scsi_host to iterate over
 357 *
 358 * Iterator that returns each device attached to @shost.  This loop
 359 * takes a reference on each device and releases it at the end.  If
 360 * you break out of the loop, you must call scsi_device_put(sdev).
 361 */
 362#define shost_for_each_device(sdev, shost) \
 363        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 364             (sdev); \
 365             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 366
 367/**
 368 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 369 * @sdev: the &struct scsi_device to use as a cursor
 370 * @shost: the &struct scsi_host to iterate over
 371 *
 372 * Iterator that returns each device attached to @shost.  It does _not_
 373 * take a reference on the scsi_device, so the whole loop must be
 374 * protected by shost->host_lock.
 375 *
 376 * Note: The only reason to use this is because you need to access the
 377 * device list in interrupt context.  Otherwise you really want to use
 378 * shost_for_each_device instead.
 379 */
 380#define __shost_for_each_device(sdev, shost) \
 381        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 382
 383extern int scsi_change_queue_depth(struct scsi_device *, int);
 384extern int scsi_track_queue_full(struct scsi_device *, int);
 385
 386extern int scsi_set_medium_removal(struct scsi_device *, char);
 387
 388extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 389                           unsigned char *buffer, int len, int timeout,
 390                           int retries, struct scsi_mode_data *data,
 391                           struct scsi_sense_hdr *);
 392extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 393                            int modepage, unsigned char *buffer, int len,
 394                            int timeout, int retries,
 395                            struct scsi_mode_data *data,
 396                            struct scsi_sense_hdr *);
 397extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 398                                int retries, struct scsi_sense_hdr *sshdr);
 399extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 400                             int buf_len);
 401extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 402                              unsigned int len, unsigned char opcode);
 403extern int scsi_device_set_state(struct scsi_device *sdev,
 404                                 enum scsi_device_state state);
 405extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 406                                          gfp_t gfpflags);
 407extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 408extern void sdev_evt_send_simple(struct scsi_device *sdev,
 409                          enum scsi_device_event evt_type, gfp_t gfpflags);
 410extern int scsi_device_quiesce(struct scsi_device *sdev);
 411extern void scsi_device_resume(struct scsi_device *sdev);
 412extern void scsi_target_quiesce(struct scsi_target *);
 413extern void scsi_target_resume(struct scsi_target *);
 414extern void scsi_scan_target(struct device *parent, unsigned int channel,
 415                             unsigned int id, u64 lun,
 416                             enum scsi_scan_mode rescan);
 417extern void scsi_target_reap(struct scsi_target *);
 418extern void scsi_target_block(struct device *);
 419extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 420extern void scsi_remove_target(struct device *);
 421extern const char *scsi_device_state_name(enum scsi_device_state);
 422extern int scsi_is_sdev_device(const struct device *);
 423extern int scsi_is_target_device(const struct device *);
 424extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 425extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 426                        int data_direction, void *buffer, unsigned bufflen,
 427                        unsigned char *sense, struct scsi_sense_hdr *sshdr,
 428                        int timeout, int retries, u64 flags,
 429                        req_flags_t rq_flags, int *resid);
 430static inline int scsi_execute_req(struct scsi_device *sdev,
 431        const unsigned char *cmd, int data_direction, void *buffer,
 432        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 433        int retries, int *resid)
 434{
 435        return scsi_execute(sdev, cmd, data_direction, buffer,
 436                bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 437}
 438extern void sdev_disable_disk_events(struct scsi_device *sdev);
 439extern void sdev_enable_disk_events(struct scsi_device *sdev);
 440extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 441extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 442
 443#ifdef CONFIG_PM
 444extern int scsi_autopm_get_device(struct scsi_device *);
 445extern void scsi_autopm_put_device(struct scsi_device *);
 446#else
 447static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 448static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 449#endif /* CONFIG_PM */
 450
 451static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 452{
 453        return device_reprobe(&sdev->sdev_gendev);
 454}
 455
 456static inline unsigned int sdev_channel(struct scsi_device *sdev)
 457{
 458        return sdev->channel;
 459}
 460
 461static inline unsigned int sdev_id(struct scsi_device *sdev)
 462{
 463        return sdev->id;
 464}
 465
 466#define scmd_id(scmd) sdev_id((scmd)->device)
 467#define scmd_channel(scmd) sdev_channel((scmd)->device)
 468
 469/*
 470 * checks for positions of the SCSI state machine
 471 */
 472static inline int scsi_device_online(struct scsi_device *sdev)
 473{
 474        return (sdev->sdev_state != SDEV_OFFLINE &&
 475                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 476                sdev->sdev_state != SDEV_DEL);
 477}
 478static inline int scsi_device_blocked(struct scsi_device *sdev)
 479{
 480        return sdev->sdev_state == SDEV_BLOCK ||
 481                sdev->sdev_state == SDEV_CREATED_BLOCK;
 482}
 483static inline int scsi_device_created(struct scsi_device *sdev)
 484{
 485        return sdev->sdev_state == SDEV_CREATED ||
 486                sdev->sdev_state == SDEV_CREATED_BLOCK;
 487}
 488
 489int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 490int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 491                                        enum scsi_device_state new_state);
 492
 493/* accessor functions for the SCSI parameters */
 494static inline int scsi_device_sync(struct scsi_device *sdev)
 495{
 496        return sdev->sdtr;
 497}
 498static inline int scsi_device_wide(struct scsi_device *sdev)
 499{
 500        return sdev->wdtr;
 501}
 502static inline int scsi_device_dt(struct scsi_device *sdev)
 503{
 504        return sdev->ppr;
 505}
 506static inline int scsi_device_dt_only(struct scsi_device *sdev)
 507{
 508        if (sdev->inquiry_len < 57)
 509                return 0;
 510        return (sdev->inquiry[56] & 0x0c) == 0x04;
 511}
 512static inline int scsi_device_ius(struct scsi_device *sdev)
 513{
 514        if (sdev->inquiry_len < 57)
 515                return 0;
 516        return sdev->inquiry[56] & 0x01;
 517}
 518static inline int scsi_device_qas(struct scsi_device *sdev)
 519{
 520        if (sdev->inquiry_len < 57)
 521                return 0;
 522        return sdev->inquiry[56] & 0x02;
 523}
 524static inline int scsi_device_enclosure(struct scsi_device *sdev)
 525{
 526        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 527}
 528
 529static inline int scsi_device_protection(struct scsi_device *sdev)
 530{
 531        if (sdev->no_dif)
 532                return 0;
 533
 534        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 535}
 536
 537static inline int scsi_device_tpgs(struct scsi_device *sdev)
 538{
 539        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 540}
 541
 542/**
 543 * scsi_device_supports_vpd - test if a device supports VPD pages
 544 * @sdev: the &struct scsi_device to test
 545 *
 546 * If the 'try_vpd_pages' flag is set it takes precedence.
 547 * Otherwise we will assume VPD pages are supported if the
 548 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 549 */
 550static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 551{
 552        /* Attempt VPD inquiry if the device blacklist explicitly calls
 553         * for it.
 554         */
 555        if (sdev->try_vpd_pages)
 556                return 1;
 557        /*
 558         * Although VPD inquiries can go to SCSI-2 type devices,
 559         * some USB ones crash on receiving them, and the pages
 560         * we currently ask for are mandatory for SPC-2 and beyond
 561         */
 562        if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 563                return 1;
 564        return 0;
 565}
 566
 567#define MODULE_ALIAS_SCSI_DEVICE(type) \
 568        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 569#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 570
 571#endif /* _SCSI_SCSI_DEVICE_H */
 572