include/scsi/scsi_device.h

   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/blk-mq.h>
   9 #include <scsi/scsi.h>
  10 #include <linux/atomic.h>
  11 #include <linux/sbitmap.h>
  12
  13 struct bsg_device;
  14 struct device;
  15 struct request_queue;
  16 struct scsi_cmnd;
  17 struct scsi_lun;
  18 struct scsi_sense_hdr;
  19
  20 typedef __u64 __bitwise blist_flags_t;
  21
  22 #define SCSI_SENSE_BUFFERSIZE   96
  23
  24 struct 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  */
  38 enum 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
  60 enum scsi_scan_mode {
  61         SCSI_SCAN_INITIAL = 0,
  62         SCSI_SCAN_RESCAN,
  63         SCSI_SCAN_MANUAL,
  64 };
  65
  66 enum 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
  82 struct 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  */
  97 struct scsi_vpd {
  98         struct rcu_head rcu;
  99         int             len;
 100         unsigned char   data[];
 101 };
 102
 103 struct 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_DEFAULT_VPD_LEN    255     /* default SCSI VPD page size (max) */
 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_vpd __rcu *vpd_pgb0;
 150         struct scsi_vpd __rcu *vpd_pgb1;
 151         struct scsi_vpd __rcu *vpd_pgb2;
 152
 153         struct scsi_target      *sdev_target;
 154
 155         blist_flags_t           sdev_bflags; /* black/white flags as also found in
 156                                  * scsi_devinfo.[hc]. For now used only to
 157                                  * pass settings from slave_alloc to scsi
 158                                  * core. */
 159         unsigned int eh_timeout; /* Error handling timeout */
 160
 161         /*
 162          * If true, let the high-level device driver (sd) manage the device
 163          * power state for system suspend/resume (suspend to RAM and
 164          * hibernation) operations.
 165          */
 166         unsigned manage_system_start_stop:1;
 167
 168         /*
 169          * If true, let the high-level device driver (sd) manage the device
 170          * power state for runtime device suspand and resume operations.
 171          */
 172         unsigned manage_runtime_start_stop:1;
 173
 174         /*
 175          * If true, let the high-level device driver (sd) manage the device
 176          * power state for system shutdown (power off) operations.
 177          */
 178         unsigned manage_shutdown:1;
 179
 180         /*
 181          * If set and if the device is runtime suspended, ask the high-level
 182          * device driver (sd) to force a runtime resume of the device.
 183          */
 184         unsigned force_runtime_start_on_system_start:1;
 185
 186         unsigned removable:1;
 187         unsigned changed:1;     /* Data invalid due to media change */
 188         unsigned busy:1;        /* Used to prevent races */
 189         unsigned lockable:1;    /* Able to prevent media removal */
 190         unsigned locked:1;      /* Media removal disabled */
 191         unsigned borken:1;      /* Tell the Seagate driver to be
 192                                  * painfully slow on this device */
 193         unsigned disconnect:1;  /* can disconnect */
 194         unsigned soft_reset:1;  /* Uses soft reset option */
 195         unsigned sdtr:1;        /* Device supports SDTR messages */
 196         unsigned wdtr:1;        /* Device supports WDTR messages */
 197         unsigned ppr:1;         /* Device supports PPR messages */
 198         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 199         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 200         unsigned was_reset:1;   /* There was a bus reset on the bus for
 201                                  * this device */
 202         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 203                                      * because we did a bus reset. */
 204         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 205         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 206         unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 207         unsigned read_before_ms:1;      /* perform a READ before MODE SENSE */
 208         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 209         unsigned no_write_same:1;       /* no WRITE SAME command */
 210         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 211         unsigned use_16_for_sync:1;     /* Use sync (16) over sync (10) */
 212         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 213         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 214         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 215         unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 216         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 217         unsigned no_start_on_add:1;     /* do not issue start on add */
 218         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 219         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 220         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 221         unsigned select_no_atn:1;
 222         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 223         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 224         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 225         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 226                                            SD_LAST_BUGGY_SECTORS */
 227         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 228         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 229         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 230         unsigned security_supported:1;  /* Supports Security Protocols */
 231         unsigned is_visible:1;  /* is the device visible in sysfs */
 232         unsigned wce_default_on:1;      /* Cache is ON by default */
 233         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 234         unsigned broken_fua:1;          /* Don't set FUA bit */
 235         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 236         unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 237         unsigned rpm_autosuspend:1;     /* Enable runtime autosuspend at device
 238                                          * creation time */
 239         unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
 240         unsigned silence_suspend:1;     /* Do not print runtime PM related messages */
 241         unsigned no_vpd_size:1;         /* No VPD size reported in header */
 242
 243         unsigned cdl_supported:1;       /* Command duration limits supported */
 244         unsigned cdl_enable:1;          /* Enable/disable Command duration limits */
 245
 246         unsigned int queue_stopped;     /* request queue is quiesced */
 247         bool offline_already;           /* Device offline message logged */
 248
 249         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 250
 251         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 252         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 253         struct list_head event_list;    /* asserted events */
 254         struct work_struct event_work;
 255
 256         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 257 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 258
 259         atomic_t iorequest_cnt;
 260         atomic_t iodone_cnt;
 261         atomic_t ioerr_cnt;
 262         atomic_t iotmo_cnt;
 263
 264         struct device           sdev_gendev,
 265                                 sdev_dev;
 266
 267         struct work_struct      requeue_work;
 268
 269         struct scsi_device_handler *handler;
 270         void                    *handler_data;
 271
 272         size_t                  dma_drain_len;
 273         void                    *dma_drain_buf;
 274
 275         unsigned int            sg_timeout;
 276         unsigned int            sg_reserved_size;
 277
 278         struct bsg_device       *bsg_dev;
 279         unsigned char           access_state;
 280         struct mutex            state_mutex;
 281         enum scsi_device_state sdev_state;
 282         struct task_struct      *quiesced_by;
 283         unsigned long           sdev_data[];
 284 } __attribute__((aligned(sizeof(unsigned long))));
 285
 286 #define to_scsi_device(d)       \
 287         container_of(d, struct scsi_device, sdev_gendev)
 288 #define class_to_sdev(d)        \
 289         container_of(d, struct scsi_device, sdev_dev)
 290 #define transport_class_to_sdev(class_dev) \
 291         to_scsi_device(class_dev->parent)
 292
 293 #define sdev_dbg(sdev, fmt, a...) \
 294         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 295
 296 /*
 297  * like scmd_printk, but the device name is passed in
 298  * as a string pointer
 299  */
 300 __printf(4, 5) void
 301 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 302                 const char *, ...);
 303
 304 #define sdev_printk(l, sdev, fmt, a...)                         \
 305         sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 306
 307 __printf(3, 4) void
 308 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 309
 310 #define scmd_dbg(scmd, fmt, a...)                                       \
 311         do {                                                            \
 312                 struct request *__rq = scsi_cmd_to_rq((scmd));          \
 313                                                                         \
 314                 if (__rq->q->disk)                                      \
 315                         sdev_dbg((scmd)->device, "[%s] " fmt,           \
 316                                  __rq->q->disk->disk_name, ##a);        \
 317                 else                                                    \
 318                         sdev_dbg((scmd)->device, fmt, ##a);             \
 319         } while (0)
 320
 321 enum scsi_target_state {
 322         STARGET_CREATED = 1,
 323         STARGET_RUNNING,
 324         STARGET_REMOVE,
 325         STARGET_CREATED_REMOVE,
 326         STARGET_DEL,
 327 };
 328
 329 /*
 330  * scsi_target: representation of a scsi target, for now, this is only
 331  * used for single_lun devices. If no one has active IO to the target,
 332  * starget_sdev_user is NULL, else it points to the active sdev.
 333  */
 334 struct scsi_target {
 335         struct scsi_device      *starget_sdev_user;
 336         struct list_head        siblings;
 337         struct list_head        devices;
 338         struct device           dev;
 339         struct kref             reap_ref; /* last put renders target invisible */
 340         unsigned int            channel;
 341         unsigned int            id; /* target id ... replace
 342                                      * scsi_device.id eventually */
 343         unsigned int            create:1; /* signal that it needs to be added */
 344         unsigned int            single_lun:1;   /* Indicates we should only
 345                                                  * allow I/O to one of the luns
 346                                                  * for the device at a time. */
 347         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 348                                                  * means no lun present. */
 349         unsigned int            no_report_luns:1;       /* Don't use
 350                                                  * REPORT LUNS for scanning. */
 351         unsigned int            expecting_lun_change:1; /* A device has reported
 352                                                  * a 3F/0E UA, other devices on
 353                                                  * the same target will also. */
 354         /* commands actually active on LLD. */
 355         atomic_t                target_busy;
 356         atomic_t                target_blocked;
 357
 358         /*
 359          * LLDs should set this in the slave_alloc host template callout.
 360          * If set to zero then there is not limit.
 361          */
 362         unsigned int            can_queue;
 363         unsigned int            max_target_blocked;
 364 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 365
 366         char                    scsi_level;
 367         enum scsi_target_state  state;
 368         void                    *hostdata; /* available to low-level driver */
 369         unsigned long           starget_data[]; /* for the transport */
 370         /* starget_data must be the last element!!!! */
 371 } __attribute__((aligned(sizeof(unsigned long))));
 372
 373 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 374 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 375 {
 376         return to_scsi_target(sdev->sdev_gendev.parent);
 377 }
 378 #define transport_class_to_starget(class_dev) \
 379         to_scsi_target(class_dev->parent)
 380
 381 #define starget_printk(prefix, starget, fmt, a...)      \
 382         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 383
 384 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 385                 uint, uint, u64, void *hostdata);
 386 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 387                            uint target, u64 lun);
 388 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 389 extern void scsi_remove_device(struct scsi_device *);
 390 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 391 void scsi_attach_vpd(struct scsi_device *sdev);
 392 void scsi_cdl_check(struct scsi_device *sdev);
 393 int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
 394
 395 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 396 extern int __must_check scsi_device_get(struct scsi_device *);
 397 extern void scsi_device_put(struct scsi_device *);
 398 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 399                                               uint, uint, u64);
 400 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 401                                                 uint, uint, u64);
 402 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 403                                                         u64);
 404 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 405                                                           u64);
 406 extern void starget_for_each_device(struct scsi_target *, void *,
 407                      void (*fn)(struct scsi_device *, void *));
 408 extern void __starget_for_each_device(struct scsi_target *, void *,
 409                                       void (*fn)(struct scsi_device *,
 410                                                  void *));
 411
 412 /* only exposed to implement shost_for_each_device */
 413 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 414                                                   struct scsi_device *);
 415
 416 /**
 417  * shost_for_each_device - iterate over all devices of a host
 418  * @sdev: the &struct scsi_device to use as a cursor
 419  * @shost: the &struct scsi_host to iterate over
 420  *
 421  * Iterator that returns each device attached to @shost.  This loop
 422  * takes a reference on each device and releases it at the end.  If
 423  * you break out of the loop, you must call scsi_device_put(sdev).
 424  */
 425 #define shost_for_each_device(sdev, shost) \
 426         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 427              (sdev); \
 428              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 429
 430 /**
 431  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 432  * @sdev: the &struct scsi_device to use as a cursor
 433  * @shost: the &struct scsi_host to iterate over
 434  *
 435  * Iterator that returns each device attached to @shost.  It does _not_
 436  * take a reference on the scsi_device, so the whole loop must be
 437  * protected by shost->host_lock.
 438  *
 439  * Note: The only reason to use this is because you need to access the
 440  * device list in interrupt context.  Otherwise you really want to use
 441  * shost_for_each_device instead.
 442  */
 443 #define __shost_for_each_device(sdev, shost) \
 444         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 445
 446 extern int scsi_change_queue_depth(struct scsi_device *, int);
 447 extern int scsi_track_queue_full(struct scsi_device *, int);
 448
 449 extern int scsi_set_medium_removal(struct scsi_device *, char);
 450
 451 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 452                     int subpage, unsigned char *buffer, int len, int timeout,
 453                     int retries, struct scsi_mode_data *data,
 454                     struct scsi_sense_hdr *);
 455 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 456                             unsigned char *buffer, int len, int timeout,
 457                             int retries, struct scsi_mode_data *data,
 458                             struct scsi_sense_hdr *);
 459 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 460                                 int retries, struct scsi_sense_hdr *sshdr);
 461 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 462                              int buf_len);
 463 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 464                        unsigned int len, unsigned char opcode,
 465                        unsigned short sa);
 466 extern int scsi_device_set_state(struct scsi_device *sdev,
 467                                  enum scsi_device_state state);
 468 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 469                                           gfp_t gfpflags);
 470 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 471 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 472                           enum scsi_device_event evt_type, gfp_t gfpflags);
 473 extern int scsi_device_quiesce(struct scsi_device *sdev);
 474 extern void scsi_device_resume(struct scsi_device *sdev);
 475 extern void scsi_target_quiesce(struct scsi_target *);
 476 extern void scsi_target_resume(struct scsi_target *);
 477 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 478                              unsigned int id, u64 lun,
 479                              enum scsi_scan_mode rescan);
 480 extern void scsi_target_reap(struct scsi_target *);
 481 void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
 482 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 483 extern void scsi_remove_target(struct device *);
 484 extern const char *scsi_device_state_name(enum scsi_device_state);
 485 extern int scsi_is_sdev_device(const struct device *);
 486 extern int scsi_is_target_device(const struct device *);
 487 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 488
 489 /* Optional arguments to scsi_execute_cmd */
 490 struct scsi_exec_args {
 491         unsigned char *sense;           /* sense buffer */
 492         unsigned int sense_len;         /* sense buffer len */
 493         struct scsi_sense_hdr *sshdr;   /* decoded sense header */
 494         blk_mq_req_flags_t req_flags;   /* BLK_MQ_REQ flags */
 495         int scmd_flags;                 /* SCMD flags */
 496         int *resid;                     /* residual length */
 497 };
 498
 499 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
 500                      blk_opf_t opf, void *buffer, unsigned int bufflen,
 501                      int timeout, int retries,
 502                      const struct scsi_exec_args *args);
 503
 504 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 505 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 506 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 507 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 508
 509 #ifdef CONFIG_PM
 510 extern int scsi_autopm_get_device(struct scsi_device *);
 511 extern void scsi_autopm_put_device(struct scsi_device *);
 512 #else
 513 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 514 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 515 #endif /* CONFIG_PM */
 516
 517 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 518 {
 519         return device_reprobe(&sdev->sdev_gendev);
 520 }
 521
 522 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 523 {
 524         return sdev->channel;
 525 }
 526
 527 static inline unsigned int sdev_id(struct scsi_device *sdev)
 528 {
 529         return sdev->id;
 530 }
 531
 532 #define scmd_id(scmd) sdev_id((scmd)->device)
 533 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 534
 535 /*
 536  * checks for positions of the SCSI state machine
 537  */
 538 static inline int scsi_device_online(struct scsi_device *sdev)
 539 {
 540         return (sdev->sdev_state != SDEV_OFFLINE &&
 541                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 542                 sdev->sdev_state != SDEV_DEL);
 543 }
 544 static inline int scsi_device_blocked(struct scsi_device *sdev)
 545 {
 546         return sdev->sdev_state == SDEV_BLOCK ||
 547                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 548 }
 549 static inline int scsi_device_created(struct scsi_device *sdev)
 550 {
 551         return sdev->sdev_state == SDEV_CREATED ||
 552                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 553 }
 554
 555 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 556 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 557                                         enum scsi_device_state new_state);
 558
 559 /* accessor functions for the SCSI parameters */
 560 static inline int scsi_device_sync(struct scsi_device *sdev)
 561 {
 562         return sdev->sdtr;
 563 }
 564 static inline int scsi_device_wide(struct scsi_device *sdev)
 565 {
 566         return sdev->wdtr;
 567 }
 568 static inline int scsi_device_dt(struct scsi_device *sdev)
 569 {
 570         return sdev->ppr;
 571 }
 572 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 573 {
 574         if (sdev->inquiry_len < 57)
 575                 return 0;
 576         return (sdev->inquiry[56] & 0x0c) == 0x04;
 577 }
 578 static inline int scsi_device_ius(struct scsi_device *sdev)
 579 {
 580         if (sdev->inquiry_len < 57)
 581                 return 0;
 582         return sdev->inquiry[56] & 0x01;
 583 }
 584 static inline int scsi_device_qas(struct scsi_device *sdev)
 585 {
 586         if (sdev->inquiry_len < 57)
 587                 return 0;
 588         return sdev->inquiry[56] & 0x02;
 589 }
 590 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 591 {
 592         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 593 }
 594
 595 static inline int scsi_device_protection(struct scsi_device *sdev)
 596 {
 597         if (sdev->no_dif)
 598                 return 0;
 599
 600         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 601 }
 602
 603 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 604 {
 605         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 606 }
 607
 608 /**
 609  * scsi_device_supports_vpd - test if a device supports VPD pages
 610  * @sdev: the &struct scsi_device to test
 611  *
 612  * If the 'try_vpd_pages' flag is set it takes precedence.
 613  * Otherwise we will assume VPD pages are supported if the
 614  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 615  */
 616 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 617 {
 618         /* Attempt VPD inquiry if the device blacklist explicitly calls
 619          * for it.
 620          */
 621         if (sdev->try_vpd_pages)
 622                 return 1;
 623         /*
 624          * Although VPD inquiries can go to SCSI-2 type devices,
 625          * some USB ones crash on receiving them, and the pages
 626          * we currently ask for are mandatory for SPC-2 and beyond
 627          */
 628         if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 629                 return 1;
 630         return 0;
 631 }
 632
 633 static inline int scsi_device_busy(struct scsi_device *sdev)
 634 {
 635         return sbitmap_weight(&sdev->budget_map);
 636 }
 637
 638 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 639         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 640 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 641
 642 #endif /* _SCSI_SCSI_DEVICE_H */