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