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
  18typedef __u64 __bitwise blist_flags_t;
  19
  20#define SCSI_SENSE_BUFFERSIZE   96
  21
  22struct scsi_mode_data {
  23        __u32   length;
  24        __u16   block_descriptor_length;
  25        __u8    medium_type;
  26        __u8    device_specific;
  27        __u8    header_length;
  28        __u8    longlba:1;
  29};
  30
  31/*
  32 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  33 * (for the ascii descriptions) and the state model enforcer:
  34 * scsi_lib:scsi_device_set_state().
  35 */
  36enum scsi_device_state {
  37        SDEV_CREATED = 1,       /* device created but not added to sysfs
  38                                 * Only internal commands allowed (for inq) */
  39        SDEV_RUNNING,           /* device properly configured
  40                                 * All commands allowed */
  41        SDEV_CANCEL,            /* beginning to delete device
  42                                 * Only error handler commands allowed */
  43        SDEV_DEL,               /* device deleted 
  44                                 * no commands allowed */
  45        SDEV_QUIESCE,           /* Device quiescent.  No block commands
  46                                 * will be accepted, only specials (which
  47                                 * originate in the mid-layer) */
  48        SDEV_OFFLINE,           /* Device offlined (by error handling or
  49                                 * user request */
  50        SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  51        SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  52                                 * scsi commands from user or midlayer
  53                                 * should be issued to the scsi
  54                                 * lld. */
  55        SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  56};
  57
  58enum scsi_scan_mode {
  59        SCSI_SCAN_INITIAL = 0,
  60        SCSI_SCAN_RESCAN,
  61        SCSI_SCAN_MANUAL,
  62};
  63
  64enum scsi_device_event {
  65        SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  66        SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  67        SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  68        SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  69        SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  70        SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  71        SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  72        SDEV_EVT_POWER_ON_RESET_OCCURRED,               /* 29 00  UA reported */
  73
  74        SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  75        SDEV_EVT_LAST           = SDEV_EVT_POWER_ON_RESET_OCCURRED,
  76
  77        SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  78};
  79
  80struct scsi_event {
  81        enum scsi_device_event  evt_type;
  82        struct list_head        node;
  83
  84        /* put union of data structures, for non-simple event types,
  85         * here
  86         */
  87};
  88
  89/**
  90 * struct scsi_vpd - SCSI Vital Product Data
  91 * @rcu: For kfree_rcu().
  92 * @len: Length in bytes of @data.
  93 * @data: VPD data as defined in various T10 SCSI standard documents.
  94 */
  95struct scsi_vpd {
  96        struct rcu_head rcu;
  97        int             len;
  98        unsigned char   data[];
  99};
 100
 101struct scsi_device {
 102        struct Scsi_Host *host;
 103        struct request_queue *request_queue;
 104
 105        /* the next two are protected by the host->host_lock */
 106        struct list_head    siblings;   /* list of all devices on this host */
 107        struct list_head    same_target_siblings; /* just the devices sharing same target id */
 108
 109        atomic_t device_busy;           /* commands actually active on LLDD */
 110        atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 111
 112        spinlock_t list_lock;
 113        struct list_head cmd_list;      /* queue of in use SCSI Command structures */
 114        struct list_head starved_entry;
 115        unsigned short queue_depth;     /* How deep of a queue we want */
 116        unsigned short max_queue_depth; /* max queue depth */
 117        unsigned short last_queue_full_depth; /* These two are used by */
 118        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 119        unsigned long last_queue_full_time;     /* last queue full time */
 120        unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 121#define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 122
 123        unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 124
 125        unsigned int id, channel;
 126        u64 lun;
 127        unsigned int manufacturer;      /* Manufacturer of device, for using 
 128                                         * vendor-specific cmd's */
 129        unsigned sector_size;   /* size in bytes */
 130
 131        void *hostdata;         /* available to low-level driver */
 132        unsigned char type;
 133        char scsi_level;
 134        char inq_periph_qual;   /* PQ from INQUIRY data */      
 135        struct mutex inquiry_mutex;
 136        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 137        unsigned char * inquiry;        /* INQUIRY response data */
 138        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 139        const char * model;             /* ... after scan; point to static string */
 140        const char * rev;               /* ... "nullnullnullnull" before scan */
 141
 142#define SCSI_VPD_PG_LEN                255
 143        struct scsi_vpd __rcu *vpd_pg0;
 144        struct scsi_vpd __rcu *vpd_pg83;
 145        struct scsi_vpd __rcu *vpd_pg80;
 146        struct scsi_vpd __rcu *vpd_pg89;
 147        unsigned char current_tag;      /* current tag */
 148        struct scsi_target      *sdev_target;   /* used only for single_lun */
 149
 150        blist_flags_t           sdev_bflags; /* black/white flags as also found in
 151                                 * scsi_devinfo.[hc]. For now used only to
 152                                 * pass settings from slave_alloc to scsi
 153                                 * core. */
 154        unsigned int eh_timeout; /* Error handling timeout */
 155        unsigned removable:1;
 156        unsigned changed:1;     /* Data invalid due to media change */
 157        unsigned busy:1;        /* Used to prevent races */
 158        unsigned lockable:1;    /* Able to prevent media removal */
 159        unsigned locked:1;      /* Media removal disabled */
 160        unsigned borken:1;      /* Tell the Seagate driver to be 
 161                                 * painfully slow on this device */
 162        unsigned disconnect:1;  /* can disconnect */
 163        unsigned soft_reset:1;  /* Uses soft reset option */
 164        unsigned sdtr:1;        /* Device supports SDTR messages */
 165        unsigned wdtr:1;        /* Device supports WDTR messages */
 166        unsigned ppr:1;         /* Device supports PPR messages */
 167        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 168        unsigned simple_tags:1; /* simple queue tag messages are enabled */
 169        unsigned was_reset:1;   /* There was a bus reset on the bus for 
 170                                 * this device */
 171        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 172                                     * because we did a bus reset. */
 173        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 174        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 175        unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 176        unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 177        unsigned no_write_same:1;       /* no WRITE SAME command */
 178        unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 179        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 180        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 181        unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 182        unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 183        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 184        unsigned no_start_on_add:1;     /* do not issue start on add */
 185        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 186        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 187        unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 188        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 189        unsigned select_no_atn:1;
 190        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 191        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 192        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 193        unsigned last_sector_bug:1;     /* do not use multisector accesses on
 194                                           SD_LAST_BUGGY_SECTORS */
 195        unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 196        unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 197        unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 198        unsigned security_supported:1;  /* Supports Security Protocols */
 199        unsigned is_visible:1;  /* is the device visible in sysfs */
 200        unsigned wce_default_on:1;      /* Cache is ON by default */
 201        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 202        unsigned broken_fua:1;          /* Don't set FUA bit */
 203        unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 204        unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 205        unsigned rpm_autosuspend:1;     /* Enable runtime autosuspend at device
 206                                         * creation time */
 207        atomic_t disk_events_disable_depth; /* disable depth for disk events */
 208
 209        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 210        DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 211        struct list_head event_list;    /* asserted events */
 212        struct work_struct event_work;
 213
 214        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 215#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 216
 217        atomic_t iorequest_cnt;
 218        atomic_t iodone_cnt;
 219        atomic_t ioerr_cnt;
 220
 221        struct device           sdev_gendev,
 222                                sdev_dev;
 223
 224        struct execute_work     ew; /* used to get process context on put */
 225        struct work_struct      requeue_work;
 226
 227        struct scsi_device_handler *handler;
 228        void                    *handler_data;
 229
 230        unsigned char           access_state;
 231        struct mutex            state_mutex;
 232        enum scsi_device_state sdev_state;
 233        struct task_struct      *quiesced_by;
 234        unsigned long           sdev_data[0];
 235} __attribute__((aligned(sizeof(unsigned long))));
 236
 237#define to_scsi_device(d)       \
 238        container_of(d, struct scsi_device, sdev_gendev)
 239#define class_to_sdev(d)        \
 240        container_of(d, struct scsi_device, sdev_dev)
 241#define transport_class_to_sdev(class_dev) \
 242        to_scsi_device(class_dev->parent)
 243
 244#define sdev_dbg(sdev, fmt, a...) \
 245        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 246
 247/*
 248 * like scmd_printk, but the device name is passed in
 249 * as a string pointer
 250 */
 251__printf(4, 5) void
 252sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 253                const char *, ...);
 254
 255#define sdev_printk(l, sdev, fmt, a...)                         \
 256        sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 257
 258__printf(3, 4) void
 259scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 260
 261#define scmd_dbg(scmd, fmt, a...)                                          \
 262        do {                                                               \
 263                if ((scmd)->request->rq_disk)                              \
 264                        sdev_dbg((scmd)->device, "[%s] " fmt,              \
 265                                 (scmd)->request->rq_disk->disk_name, ##a);\
 266                else                                                       \
 267                        sdev_dbg((scmd)->device, fmt, ##a);                \
 268        } while (0)
 269
 270enum scsi_target_state {
 271        STARGET_CREATED = 1,
 272        STARGET_RUNNING,
 273        STARGET_REMOVE,
 274        STARGET_CREATED_REMOVE,
 275        STARGET_DEL,
 276};
 277
 278/*
 279 * scsi_target: representation of a scsi target, for now, this is only
 280 * used for single_lun devices. If no one has active IO to the target,
 281 * starget_sdev_user is NULL, else it points to the active sdev.
 282 */
 283struct scsi_target {
 284        struct scsi_device      *starget_sdev_user;
 285        struct list_head        siblings;
 286        struct list_head        devices;
 287        struct device           dev;
 288        struct kref             reap_ref; /* last put renders target invisible */
 289        unsigned int            channel;
 290        unsigned int            id; /* target id ... replace
 291                                     * scsi_device.id eventually */
 292        unsigned int            create:1; /* signal that it needs to be added */
 293        unsigned int            single_lun:1;   /* Indicates we should only
 294                                                 * allow I/O to one of the luns
 295                                                 * for the device at a time. */
 296        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 297                                                 * means no lun present. */
 298        unsigned int            no_report_luns:1;       /* Don't use
 299                                                 * REPORT LUNS for scanning. */
 300        unsigned int            expecting_lun_change:1; /* A device has reported
 301                                                 * a 3F/0E UA, other devices on
 302                                                 * the same target will also. */
 303        /* commands actually active on LLD. */
 304        atomic_t                target_busy;
 305        atomic_t                target_blocked;
 306
 307        /*
 308         * LLDs should set this in the slave_alloc host template callout.
 309         * If set to zero then there is not limit.
 310         */
 311        unsigned int            can_queue;
 312        unsigned int            max_target_blocked;
 313#define SCSI_DEFAULT_TARGET_BLOCKED     3
 314
 315        char                    scsi_level;
 316        enum scsi_target_state  state;
 317        void                    *hostdata; /* available to low-level driver */
 318        unsigned long           starget_data[0]; /* for the transport */
 319        /* starget_data must be the last element!!!! */
 320} __attribute__((aligned(sizeof(unsigned long))));
 321
 322#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 323static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 324{
 325        return to_scsi_target(sdev->sdev_gendev.parent);
 326}
 327#define transport_class_to_starget(class_dev) \
 328        to_scsi_target(class_dev->parent)
 329
 330#define starget_printk(prefix, starget, fmt, a...)      \
 331        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 332
 333extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 334                uint, uint, u64, void *hostdata);
 335extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 336                           uint target, u64 lun);
 337extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 338extern void scsi_remove_device(struct scsi_device *);
 339extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 340void scsi_attach_vpd(struct scsi_device *sdev);
 341
 342extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 343extern int __must_check scsi_device_get(struct scsi_device *);
 344extern void scsi_device_put(struct scsi_device *);
 345extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 346                                              uint, uint, u64);
 347extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 348                                                uint, uint, u64);
 349extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 350                                                        u64);
 351extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 352                                                          u64);
 353extern void starget_for_each_device(struct scsi_target *, void *,
 354                     void (*fn)(struct scsi_device *, void *));
 355extern void __starget_for_each_device(struct scsi_target *, void *,
 356                                      void (*fn)(struct scsi_device *,
 357                                                 void *));
 358
 359/* only exposed to implement shost_for_each_device */
 360extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 361                                                  struct scsi_device *);
 362
 363/**
 364 * shost_for_each_device - iterate over all devices of a host
 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.  This loop
 369 * takes a reference on each device and releases it at the end.  If
 370 * you break out of the loop, you must call scsi_device_put(sdev).
 371 */
 372#define shost_for_each_device(sdev, shost) \
 373        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 374             (sdev); \
 375             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 376
 377/**
 378 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 379 * @sdev: the &struct scsi_device to use as a cursor
 380 * @shost: the &struct scsi_host to iterate over
 381 *
 382 * Iterator that returns each device attached to @shost.  It does _not_
 383 * take a reference on the scsi_device, so the whole loop must be
 384 * protected by shost->host_lock.
 385 *
 386 * Note: The only reason to use this is because you need to access the
 387 * device list in interrupt context.  Otherwise you really want to use
 388 * shost_for_each_device instead.
 389 */
 390#define __shost_for_each_device(sdev, shost) \
 391        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 392
 393extern int scsi_change_queue_depth(struct scsi_device *, int);
 394extern int scsi_track_queue_full(struct scsi_device *, int);
 395
 396extern int scsi_set_medium_removal(struct scsi_device *, char);
 397
 398extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 399                           unsigned char *buffer, int len, int timeout,
 400                           int retries, struct scsi_mode_data *data,
 401                           struct scsi_sense_hdr *);
 402extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 403                            int modepage, unsigned char *buffer, int len,
 404                            int timeout, int retries,
 405                            struct scsi_mode_data *data,
 406                            struct scsi_sense_hdr *);
 407extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 408                                int retries, struct scsi_sense_hdr *sshdr);
 409extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 410                             int buf_len);
 411extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 412                              unsigned int len, unsigned char opcode);
 413extern int scsi_device_set_state(struct scsi_device *sdev,
 414                                 enum scsi_device_state state);
 415extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 416                                          gfp_t gfpflags);
 417extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 418extern void sdev_evt_send_simple(struct scsi_device *sdev,
 419                          enum scsi_device_event evt_type, gfp_t gfpflags);
 420extern int scsi_device_quiesce(struct scsi_device *sdev);
 421extern void scsi_device_resume(struct scsi_device *sdev);
 422extern void scsi_target_quiesce(struct scsi_target *);
 423extern void scsi_target_resume(struct scsi_target *);
 424extern void scsi_scan_target(struct device *parent, unsigned int channel,
 425                             unsigned int id, u64 lun,
 426                             enum scsi_scan_mode rescan);
 427extern void scsi_target_reap(struct scsi_target *);
 428extern void scsi_target_block(struct device *);
 429extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 430extern void scsi_remove_target(struct device *);
 431extern const char *scsi_device_state_name(enum scsi_device_state);
 432extern int scsi_is_sdev_device(const struct device *);
 433extern int scsi_is_target_device(const struct device *);
 434extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 435extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 436                        int data_direction, void *buffer, unsigned bufflen,
 437                        unsigned char *sense, struct scsi_sense_hdr *sshdr,
 438                        int timeout, int retries, u64 flags,
 439                        req_flags_t rq_flags, int *resid);
 440/* Make sure any sense buffer is the correct size. */
 441#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
 442                     sshdr, timeout, retries, flags, rq_flags, resid)   \
 443({                                                                      \
 444        BUILD_BUG_ON((sense) != NULL &&                                 \
 445                     sizeof(sense) != SCSI_SENSE_BUFFERSIZE);           \
 446        __scsi_execute(sdev, cmd, data_direction, buffer, bufflen,      \
 447                       sense, sshdr, timeout, retries, flags, rq_flags, \
 448                       resid);                                          \
 449})
 450static inline int scsi_execute_req(struct scsi_device *sdev,
 451        const unsigned char *cmd, int data_direction, void *buffer,
 452        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 453        int retries, int *resid)
 454{
 455        return scsi_execute(sdev, cmd, data_direction, buffer,
 456                bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 457}
 458extern void sdev_disable_disk_events(struct scsi_device *sdev);
 459extern void sdev_enable_disk_events(struct scsi_device *sdev);
 460extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 461extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 462
 463#ifdef CONFIG_PM
 464extern int scsi_autopm_get_device(struct scsi_device *);
 465extern void scsi_autopm_put_device(struct scsi_device *);
 466#else
 467static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 468static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 469#endif /* CONFIG_PM */
 470
 471static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 472{
 473        return device_reprobe(&sdev->sdev_gendev);
 474}
 475
 476static inline unsigned int sdev_channel(struct scsi_device *sdev)
 477{
 478        return sdev->channel;
 479}
 480
 481static inline unsigned int sdev_id(struct scsi_device *sdev)
 482{
 483        return sdev->id;
 484}
 485
 486#define scmd_id(scmd) sdev_id((scmd)->device)
 487#define scmd_channel(scmd) sdev_channel((scmd)->device)
 488
 489/*
 490 * checks for positions of the SCSI state machine
 491 */
 492static inline int scsi_device_online(struct scsi_device *sdev)
 493{
 494        return (sdev->sdev_state != SDEV_OFFLINE &&
 495                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 496                sdev->sdev_state != SDEV_DEL);
 497}
 498static inline int scsi_device_blocked(struct scsi_device *sdev)
 499{
 500        return sdev->sdev_state == SDEV_BLOCK ||
 501                sdev->sdev_state == SDEV_CREATED_BLOCK;
 502}
 503static inline int scsi_device_created(struct scsi_device *sdev)
 504{
 505        return sdev->sdev_state == SDEV_CREATED ||
 506                sdev->sdev_state == SDEV_CREATED_BLOCK;
 507}
 508
 509int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 510int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 511                                        enum scsi_device_state new_state);
 512
 513/* accessor functions for the SCSI parameters */
 514static inline int scsi_device_sync(struct scsi_device *sdev)
 515{
 516        return sdev->sdtr;
 517}
 518static inline int scsi_device_wide(struct scsi_device *sdev)
 519{
 520        return sdev->wdtr;
 521}
 522static inline int scsi_device_dt(struct scsi_device *sdev)
 523{
 524        return sdev->ppr;
 525}
 526static inline int scsi_device_dt_only(struct scsi_device *sdev)
 527{
 528        if (sdev->inquiry_len < 57)
 529                return 0;
 530        return (sdev->inquiry[56] & 0x0c) == 0x04;
 531}
 532static inline int scsi_device_ius(struct scsi_device *sdev)
 533{
 534        if (sdev->inquiry_len < 57)
 535                return 0;
 536        return sdev->inquiry[56] & 0x01;
 537}
 538static inline int scsi_device_qas(struct scsi_device *sdev)
 539{
 540        if (sdev->inquiry_len < 57)
 541                return 0;
 542        return sdev->inquiry[56] & 0x02;
 543}
 544static inline int scsi_device_enclosure(struct scsi_device *sdev)
 545{
 546        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 547}
 548
 549static inline int scsi_device_protection(struct scsi_device *sdev)
 550{
 551        if (sdev->no_dif)
 552                return 0;
 553
 554        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 555}
 556
 557static inline int scsi_device_tpgs(struct scsi_device *sdev)
 558{
 559        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 560}
 561
 562/**
 563 * scsi_device_supports_vpd - test if a device supports VPD pages
 564 * @sdev: the &struct scsi_device to test
 565 *
 566 * If the 'try_vpd_pages' flag is set it takes precedence.
 567 * Otherwise we will assume VPD pages are supported if the
 568 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 569 */
 570static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 571{
 572        /* Attempt VPD inquiry if the device blacklist explicitly calls
 573         * for it.
 574         */
 575        if (sdev->try_vpd_pages)
 576                return 1;
 577        /*
 578         * Although VPD inquiries can go to SCSI-2 type devices,
 579         * some USB ones crash on receiving them, and the pages
 580         * we currently ask for are mandatory for SPC-2 and beyond
 581         */
 582        if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 583                return 1;
 584        return 0;
 585}
 586
 587#define MODULE_ALIAS_SCSI_DEVICE(type) \
 588        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 589#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 590
 591#endif /* _SCSI_SCSI_DEVICE_H */
 592