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#include <linux/sbitmap.h>
  12
  13struct bsg_device;
  14struct device;
  15struct request_queue;
  16struct scsi_cmnd;
  17struct scsi_lun;
  18struct scsi_sense_hdr;
  19
  20typedef __u64 __bitwise blist_flags_t;
  21
  22#define SCSI_SENSE_BUFFERSIZE   96
  23
  24struct scsi_mode_data {
  25        __u32   length;
  26        __u16   block_descriptor_length;
  27        __u8    medium_type;
  28        __u8    device_specific;
  29        __u8    header_length;
  30        __u8    longlba:1;
  31};
  32
  33/*
  34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  35 * (for the ascii descriptions) and the state model enforcer:
  36 * scsi_lib:scsi_device_set_state().
  37 */
  38enum scsi_device_state {
  39        SDEV_CREATED = 1,       /* device created but not added to sysfs
  40                                 * Only internal commands allowed (for inq) */
  41        SDEV_RUNNING,           /* device properly configured
  42                                 * All commands allowed */
  43        SDEV_CANCEL,            /* beginning to delete device
  44                                 * Only error handler commands allowed */
  45        SDEV_DEL,               /* device deleted 
  46                                 * no commands allowed */
  47        SDEV_QUIESCE,           /* Device quiescent.  No block commands
  48                                 * will be accepted, only specials (which
  49                                 * originate in the mid-layer) */
  50        SDEV_OFFLINE,           /* Device offlined (by error handling or
  51                                 * user request */
  52        SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  53        SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  54                                 * scsi commands from user or midlayer
  55                                 * should be issued to the scsi
  56                                 * lld. */
  57        SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  58};
  59
  60enum scsi_scan_mode {
  61        SCSI_SCAN_INITIAL = 0,
  62        SCSI_SCAN_RESCAN,
  63        SCSI_SCAN_MANUAL,
  64};
  65
  66enum scsi_device_event {
  67        SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  68        SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  69        SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  70        SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  71        SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  72        SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  73        SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  74        SDEV_EVT_POWER_ON_RESET_OCCURRED,               /* 29 00  UA reported */
  75
  76        SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  77        SDEV_EVT_LAST           = SDEV_EVT_POWER_ON_RESET_OCCURRED,
  78
  79        SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  80};
  81
  82struct scsi_event {
  83        enum scsi_device_event  evt_type;
  84        struct list_head        node;
  85
  86        /* put union of data structures, for non-simple event types,
  87         * here
  88         */
  89};
  90
  91/**
  92 * struct scsi_vpd - SCSI Vital Product Data
  93 * @rcu: For kfree_rcu().
  94 * @len: Length in bytes of @data.
  95 * @data: VPD data as defined in various T10 SCSI standard documents.
  96 */
  97struct scsi_vpd {
  98        struct rcu_head rcu;
  99        int             len;
 100        unsigned char   data[];
 101};
 102
 103struct scsi_device {
 104        struct Scsi_Host *host;
 105        struct request_queue *request_queue;
 106
 107        /* the next two are protected by the host->host_lock */
 108        struct list_head    siblings;   /* list of all devices on this host */
 109        struct list_head    same_target_siblings; /* just the devices sharing same target id */
 110
 111        struct sbitmap budget_map;
 112        atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 113
 114        atomic_t restarts;
 115        spinlock_t list_lock;
 116        struct list_head starved_entry;
 117        unsigned short queue_depth;     /* How deep of a queue we want */
 118        unsigned short max_queue_depth; /* max queue depth */
 119        unsigned short last_queue_full_depth; /* These two are used by */
 120        unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 121        unsigned long last_queue_full_time;     /* last queue full time */
 122        unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 123#define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 124
 125        unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 126
 127        unsigned int id, channel;
 128        u64 lun;
 129        unsigned int manufacturer;      /* Manufacturer of device, for using 
 130                                         * vendor-specific cmd's */
 131        unsigned sector_size;   /* size in bytes */
 132
 133        void *hostdata;         /* available to low-level driver */
 134        unsigned char type;
 135        char scsi_level;
 136        char inq_periph_qual;   /* PQ from INQUIRY data */      
 137        struct mutex inquiry_mutex;
 138        unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 139        unsigned char * inquiry;        /* INQUIRY response data */
 140        const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 141        const char * model;             /* ... after scan; point to static string */
 142        const char * rev;               /* ... "nullnullnullnull" before scan */
 143
 144#define SCSI_VPD_PG_LEN                255
 145        struct scsi_vpd __rcu *vpd_pg0;
 146        struct scsi_vpd __rcu *vpd_pg83;
 147        struct scsi_vpd __rcu *vpd_pg80;
 148        struct scsi_vpd __rcu *vpd_pg89;
 149        struct scsi_target      *sdev_target;
 150
 151        blist_flags_t           sdev_bflags; /* black/white flags as also found in
 152                                 * scsi_devinfo.[hc]. For now used only to
 153                                 * pass settings from slave_alloc to scsi
 154                                 * core. */
 155        unsigned int eh_timeout; /* Error handling timeout */
 156        unsigned removable:1;
 157        unsigned changed:1;     /* Data invalid due to media change */
 158        unsigned busy:1;        /* Used to prevent races */
 159        unsigned lockable:1;    /* Able to prevent media removal */
 160        unsigned locked:1;      /* Media removal disabled */
 161        unsigned borken:1;      /* Tell the Seagate driver to be 
 162                                 * painfully slow on this device */
 163        unsigned disconnect:1;  /* can disconnect */
 164        unsigned soft_reset:1;  /* Uses soft reset option */
 165        unsigned sdtr:1;        /* Device supports SDTR messages */
 166        unsigned wdtr:1;        /* Device supports WDTR messages */
 167        unsigned ppr:1;         /* Device supports PPR messages */
 168        unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 169        unsigned simple_tags:1; /* simple queue tag messages are enabled */
 170        unsigned was_reset:1;   /* There was a bus reset on the bus for 
 171                                 * this device */
 172        unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 173                                     * because we did a bus reset. */
 174        unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 175        unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 176        unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 177        unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 178        unsigned no_write_same:1;       /* no WRITE SAME command */
 179        unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 180        unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 181        unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 182        unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 183        unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 184        unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 185        unsigned no_start_on_add:1;     /* do not issue start on add */
 186        unsigned allow_restart:1; /* issue START_UNIT in error handler */
 187        unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 188        unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 189        unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 190        unsigned select_no_atn:1;
 191        unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 192        unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 193        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 194        unsigned last_sector_bug:1;     /* do not use multisector accesses on
 195                                           SD_LAST_BUGGY_SECTORS */
 196        unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 197        unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 198        unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 199        unsigned security_supported:1;  /* Supports Security Protocols */
 200        unsigned is_visible:1;  /* is the device visible in sysfs */
 201        unsigned wce_default_on:1;      /* Cache is ON by default */
 202        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 203        unsigned broken_fua:1;          /* Don't set FUA bit */
 204        unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 205        unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 206        unsigned rpm_autosuspend:1;     /* Enable runtime autosuspend at device
 207                                         * creation time */
 208        unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
 209
 210        bool offline_already;           /* Device offline message logged */
 211
 212        atomic_t disk_events_disable_depth; /* disable depth for disk events */
 213
 214        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 215        DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 216        struct list_head event_list;    /* asserted events */
 217        struct work_struct event_work;
 218
 219        unsigned int max_device_blocked; /* what device_blocked counts down from  */
 220#define SCSI_DEFAULT_DEVICE_BLOCKED     3
 221
 222        atomic_t iorequest_cnt;
 223        atomic_t iodone_cnt;
 224        atomic_t ioerr_cnt;
 225
 226        struct device           sdev_gendev,
 227                                sdev_dev;
 228
 229        struct execute_work     ew; /* used to get process context on put */
 230        struct work_struct      requeue_work;
 231
 232        struct scsi_device_handler *handler;
 233        void                    *handler_data;
 234
 235        size_t                  dma_drain_len;
 236        void                    *dma_drain_buf;
 237
 238        unsigned int            sg_timeout;
 239        unsigned int            sg_reserved_size;
 240
 241        struct bsg_device       *bsg_dev;
 242        unsigned char           access_state;
 243        struct mutex            state_mutex;
 244        enum scsi_device_state sdev_state;
 245        struct task_struct      *quiesced_by;
 246        unsigned long           sdev_data[];
 247} __attribute__((aligned(sizeof(unsigned long))));
 248
 249#define to_scsi_device(d)       \
 250        container_of(d, struct scsi_device, sdev_gendev)
 251#define class_to_sdev(d)        \
 252        container_of(d, struct scsi_device, sdev_dev)
 253#define transport_class_to_sdev(class_dev) \
 254        to_scsi_device(class_dev->parent)
 255
 256#define sdev_dbg(sdev, fmt, a...) \
 257        dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 258
 259/*
 260 * like scmd_printk, but the device name is passed in
 261 * as a string pointer
 262 */
 263__printf(4, 5) void
 264sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 265                const char *, ...);
 266
 267#define sdev_printk(l, sdev, fmt, a...)                         \
 268        sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 269
 270__printf(3, 4) void
 271scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 272
 273#define scmd_dbg(scmd, fmt, a...)                                       \
 274        do {                                                            \
 275                struct request *__rq = scsi_cmd_to_rq((scmd));          \
 276                                                                        \
 277                if (__rq->rq_disk)                                      \
 278                        sdev_dbg((scmd)->device, "[%s] " fmt,           \
 279                                 __rq->rq_disk->disk_name, ##a);        \
 280                else                                                    \
 281                        sdev_dbg((scmd)->device, fmt, ##a);             \
 282        } while (0)
 283
 284enum scsi_target_state {
 285        STARGET_CREATED = 1,
 286        STARGET_RUNNING,
 287        STARGET_REMOVE,
 288        STARGET_CREATED_REMOVE,
 289        STARGET_DEL,
 290};
 291
 292/*
 293 * scsi_target: representation of a scsi target, for now, this is only
 294 * used for single_lun devices. If no one has active IO to the target,
 295 * starget_sdev_user is NULL, else it points to the active sdev.
 296 */
 297struct scsi_target {
 298        struct scsi_device      *starget_sdev_user;
 299        struct list_head        siblings;
 300        struct list_head        devices;
 301        struct device           dev;
 302        struct kref             reap_ref; /* last put renders target invisible */
 303        unsigned int            channel;
 304        unsigned int            id; /* target id ... replace
 305                                     * scsi_device.id eventually */
 306        unsigned int            create:1; /* signal that it needs to be added */
 307        unsigned int            single_lun:1;   /* Indicates we should only
 308                                                 * allow I/O to one of the luns
 309                                                 * for the device at a time. */
 310        unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 311                                                 * means no lun present. */
 312        unsigned int            no_report_luns:1;       /* Don't use
 313                                                 * REPORT LUNS for scanning. */
 314        unsigned int            expecting_lun_change:1; /* A device has reported
 315                                                 * a 3F/0E UA, other devices on
 316                                                 * the same target will also. */
 317        /* commands actually active on LLD. */
 318        atomic_t                target_busy;
 319        atomic_t                target_blocked;
 320
 321        /*
 322         * LLDs should set this in the slave_alloc host template callout.
 323         * If set to zero then there is not limit.
 324         */
 325        unsigned int            can_queue;
 326        unsigned int            max_target_blocked;
 327#define SCSI_DEFAULT_TARGET_BLOCKED     3
 328
 329        char                    scsi_level;
 330        enum scsi_target_state  state;
 331        void                    *hostdata; /* available to low-level driver */
 332        unsigned long           starget_data[]; /* for the transport */
 333        /* starget_data must be the last element!!!! */
 334} __attribute__((aligned(sizeof(unsigned long))));
 335
 336#define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 337static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 338{
 339        return to_scsi_target(sdev->sdev_gendev.parent);
 340}
 341#define transport_class_to_starget(class_dev) \
 342        to_scsi_target(class_dev->parent)
 343
 344#define starget_printk(prefix, starget, fmt, a...)      \
 345        dev_printk(prefix, &(starget)->dev, fmt, ##a)
 346
 347extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 348                uint, uint, u64, void *hostdata);
 349extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 350                           uint target, u64 lun);
 351extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 352extern void scsi_remove_device(struct scsi_device *);
 353extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 354void scsi_attach_vpd(struct scsi_device *sdev);
 355
 356extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 357extern int __must_check scsi_device_get(struct scsi_device *);
 358extern void scsi_device_put(struct scsi_device *);
 359extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 360                                              uint, uint, u64);
 361extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 362                                                uint, uint, u64);
 363extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 364                                                        u64);
 365extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 366                                                          u64);
 367extern void starget_for_each_device(struct scsi_target *, void *,
 368                     void (*fn)(struct scsi_device *, void *));
 369extern void __starget_for_each_device(struct scsi_target *, void *,
 370                                      void (*fn)(struct scsi_device *,
 371                                                 void *));
 372
 373/* only exposed to implement shost_for_each_device */
 374extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 375                                                  struct scsi_device *);
 376
 377/**
 378 * shost_for_each_device - iterate over all devices of a host
 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.  This loop
 383 * takes a reference on each device and releases it at the end.  If
 384 * you break out of the loop, you must call scsi_device_put(sdev).
 385 */
 386#define shost_for_each_device(sdev, shost) \
 387        for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 388             (sdev); \
 389             (sdev) = __scsi_iterate_devices((shost), (sdev)))
 390
 391/**
 392 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 393 * @sdev: the &struct scsi_device to use as a cursor
 394 * @shost: the &struct scsi_host to iterate over
 395 *
 396 * Iterator that returns each device attached to @shost.  It does _not_
 397 * take a reference on the scsi_device, so the whole loop must be
 398 * protected by shost->host_lock.
 399 *
 400 * Note: The only reason to use this is because you need to access the
 401 * device list in interrupt context.  Otherwise you really want to use
 402 * shost_for_each_device instead.
 403 */
 404#define __shost_for_each_device(sdev, shost) \
 405        list_for_each_entry((sdev), &((shost)->__devices), siblings)
 406
 407extern int scsi_change_queue_depth(struct scsi_device *, int);
 408extern int scsi_track_queue_full(struct scsi_device *, int);
 409
 410extern int scsi_set_medium_removal(struct scsi_device *, char);
 411
 412extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 413                           unsigned char *buffer, int len, int timeout,
 414                           int retries, struct scsi_mode_data *data,
 415                           struct scsi_sense_hdr *);
 416extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 417                            int modepage, unsigned char *buffer, int len,
 418                            int timeout, int retries,
 419                            struct scsi_mode_data *data,
 420                            struct scsi_sense_hdr *);
 421extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 422                                int retries, struct scsi_sense_hdr *sshdr);
 423extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 424                             int buf_len);
 425extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 426                              unsigned int len, unsigned char opcode);
 427extern int scsi_device_set_state(struct scsi_device *sdev,
 428                                 enum scsi_device_state state);
 429extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 430                                          gfp_t gfpflags);
 431extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 432extern void sdev_evt_send_simple(struct scsi_device *sdev,
 433                          enum scsi_device_event evt_type, gfp_t gfpflags);
 434extern int scsi_device_quiesce(struct scsi_device *sdev);
 435extern void scsi_device_resume(struct scsi_device *sdev);
 436extern void scsi_target_quiesce(struct scsi_target *);
 437extern void scsi_target_resume(struct scsi_target *);
 438extern void scsi_scan_target(struct device *parent, unsigned int channel,
 439                             unsigned int id, u64 lun,
 440                             enum scsi_scan_mode rescan);
 441extern void scsi_target_reap(struct scsi_target *);
 442extern void scsi_target_block(struct device *);
 443extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 444extern void scsi_remove_target(struct device *);
 445extern const char *scsi_device_state_name(enum scsi_device_state);
 446extern int scsi_is_sdev_device(const struct device *);
 447extern int scsi_is_target_device(const struct device *);
 448extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 449extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 450                        int data_direction, void *buffer, unsigned bufflen,
 451                        unsigned char *sense, struct scsi_sense_hdr *sshdr,
 452                        int timeout, int retries, u64 flags,
 453                        req_flags_t rq_flags, int *resid);
 454/* Make sure any sense buffer is the correct size. */
 455#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
 456                     sshdr, timeout, retries, flags, rq_flags, resid)   \
 457({                                                                      \
 458        BUILD_BUG_ON((sense) != NULL &&                                 \
 459                     sizeof(sense) != SCSI_SENSE_BUFFERSIZE);           \
 460        __scsi_execute(sdev, cmd, data_direction, buffer, bufflen,      \
 461                       sense, sshdr, timeout, retries, flags, rq_flags, \
 462                       resid);                                          \
 463})
 464static inline int scsi_execute_req(struct scsi_device *sdev,
 465        const unsigned char *cmd, int data_direction, void *buffer,
 466        unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 467        int retries, int *resid)
 468{
 469        return scsi_execute(sdev, cmd, data_direction, buffer,
 470                bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 471}
 472extern void sdev_disable_disk_events(struct scsi_device *sdev);
 473extern void sdev_enable_disk_events(struct scsi_device *sdev);
 474extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 475extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 476
 477#ifdef CONFIG_PM
 478extern int scsi_autopm_get_device(struct scsi_device *);
 479extern void scsi_autopm_put_device(struct scsi_device *);
 480#else
 481static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 482static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 483#endif /* CONFIG_PM */
 484
 485static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 486{
 487        return device_reprobe(&sdev->sdev_gendev);
 488}
 489
 490static inline unsigned int sdev_channel(struct scsi_device *sdev)
 491{
 492        return sdev->channel;
 493}
 494
 495static inline unsigned int sdev_id(struct scsi_device *sdev)
 496{
 497        return sdev->id;
 498}
 499
 500#define scmd_id(scmd) sdev_id((scmd)->device)
 501#define scmd_channel(scmd) sdev_channel((scmd)->device)
 502
 503/*
 504 * checks for positions of the SCSI state machine
 505 */
 506static inline int scsi_device_online(struct scsi_device *sdev)
 507{
 508        return (sdev->sdev_state != SDEV_OFFLINE &&
 509                sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 510                sdev->sdev_state != SDEV_DEL);
 511}
 512static inline int scsi_device_blocked(struct scsi_device *sdev)
 513{
 514        return sdev->sdev_state == SDEV_BLOCK ||
 515                sdev->sdev_state == SDEV_CREATED_BLOCK;
 516}
 517static inline int scsi_device_created(struct scsi_device *sdev)
 518{
 519        return sdev->sdev_state == SDEV_CREATED ||
 520                sdev->sdev_state == SDEV_CREATED_BLOCK;
 521}
 522
 523int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 524int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 525                                        enum scsi_device_state new_state);
 526
 527/* accessor functions for the SCSI parameters */
 528static inline int scsi_device_sync(struct scsi_device *sdev)
 529{
 530        return sdev->sdtr;
 531}
 532static inline int scsi_device_wide(struct scsi_device *sdev)
 533{
 534        return sdev->wdtr;
 535}
 536static inline int scsi_device_dt(struct scsi_device *sdev)
 537{
 538        return sdev->ppr;
 539}
 540static inline int scsi_device_dt_only(struct scsi_device *sdev)
 541{
 542        if (sdev->inquiry_len < 57)
 543                return 0;
 544        return (sdev->inquiry[56] & 0x0c) == 0x04;
 545}
 546static inline int scsi_device_ius(struct scsi_device *sdev)
 547{
 548        if (sdev->inquiry_len < 57)
 549                return 0;
 550        return sdev->inquiry[56] & 0x01;
 551}
 552static inline int scsi_device_qas(struct scsi_device *sdev)
 553{
 554        if (sdev->inquiry_len < 57)
 555                return 0;
 556        return sdev->inquiry[56] & 0x02;
 557}
 558static inline int scsi_device_enclosure(struct scsi_device *sdev)
 559{
 560        return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 561}
 562
 563static inline int scsi_device_protection(struct scsi_device *sdev)
 564{
 565        if (sdev->no_dif)
 566                return 0;
 567
 568        return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 569}
 570
 571static inline int scsi_device_tpgs(struct scsi_device *sdev)
 572{
 573        return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 574}
 575
 576/**
 577 * scsi_device_supports_vpd - test if a device supports VPD pages
 578 * @sdev: the &struct scsi_device to test
 579 *
 580 * If the 'try_vpd_pages' flag is set it takes precedence.
 581 * Otherwise we will assume VPD pages are supported if the
 582 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 583 */
 584static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 585{
 586        /* Attempt VPD inquiry if the device blacklist explicitly calls
 587         * for it.
 588         */
 589        if (sdev->try_vpd_pages)
 590                return 1;
 591        /*
 592         * Although VPD inquiries can go to SCSI-2 type devices,
 593         * some USB ones crash on receiving them, and the pages
 594         * we currently ask for are mandatory for SPC-2 and beyond
 595         */
 596        if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 597                return 1;
 598        return 0;
 599}
 600
 601static inline int scsi_device_busy(struct scsi_device *sdev)
 602{
 603        return sbitmap_weight(&sdev->budget_map);
 604}
 605
 606#define MODULE_ALIAS_SCSI_DEVICE(type) \
 607        MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 608#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 609
 610#endif /* _SCSI_SCSI_DEVICE_H */
 611