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 enum scsi_vpd_parameters {
 104         SCSI_VPD_HEADER_SIZE = 4,
 105 };
 106
 107 struct scsi_device {
 108         struct Scsi_Host *host;
 109         struct request_queue *request_queue;
 110
 111         /* the next two are protected by the host->host_lock */
 112         struct list_head    siblings;   /* list of all devices on this host */
 113         struct list_head    same_target_siblings; /* just the devices sharing same target id */
 114
 115         struct sbitmap budget_map;
 116         atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 117
 118         atomic_t restarts;
 119         spinlock_t list_lock;
 120         struct list_head starved_entry;
 121         unsigned short queue_depth;     /* How deep of a queue we want */
 122         unsigned short max_queue_depth; /* max queue depth */
 123         unsigned short last_queue_full_depth; /* These two are used by */
 124         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 125         unsigned long last_queue_full_time;     /* last queue full time */
 126         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 127 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 128
 129         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 130
 131         unsigned int id, channel;
 132         u64 lun;
 133         unsigned int manufacturer;      /* Manufacturer of device, for using
 134                                          * vendor-specific cmd's */
 135         unsigned sector_size;   /* size in bytes */
 136
 137         void *hostdata;         /* available to low-level driver */
 138         unsigned char type;
 139         char scsi_level;
 140         char inq_periph_qual;   /* PQ from INQUIRY data */
 141         struct mutex inquiry_mutex;
 142         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 143         unsigned char * inquiry;        /* INQUIRY response data */
 144         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 145         const char * model;             /* ... after scan; point to static string */
 146         const char * rev;               /* ... "nullnullnullnull" before scan */
 147
 148 #define SCSI_DEFAULT_VPD_LEN    255     /* default SCSI VPD page size (max) */
 149         struct scsi_vpd __rcu *vpd_pg0;
 150         struct scsi_vpd __rcu *vpd_pg83;
 151         struct scsi_vpd __rcu *vpd_pg80;
 152         struct scsi_vpd __rcu *vpd_pg89;
 153         struct scsi_vpd __rcu *vpd_pgb0;
 154         struct scsi_vpd __rcu *vpd_pgb1;
 155         struct scsi_vpd __rcu *vpd_pgb2;
 156
 157         struct scsi_target      *sdev_target;
 158
 159         blist_flags_t           sdev_bflags; /* black/white flags as also found in
 160                                  * scsi_devinfo.[hc]. For now used only to
 161                                  * pass settings from slave_alloc to scsi
 162                                  * core. */
 163         unsigned int eh_timeout; /* Error handling timeout */
 164
 165         /*
 166          * If true, let the high-level device driver (sd) manage the device
 167          * power state for system suspend/resume (suspend to RAM and
 168          * hibernation) operations.
 169          */
 170         bool manage_system_start_stop;
 171
 172         /*
 173          * If true, let the high-level device driver (sd) manage the device
 174          * power state for runtime device suspand and resume operations.
 175          */
 176         bool manage_runtime_start_stop;
 177
 178         /*
 179          * If true, let the high-level device driver (sd) manage the device
 180          * power state for system shutdown (power off) operations.
 181          */
 182         bool manage_shutdown;
 183
 184         unsigned removable:1;
 185         unsigned changed:1;     /* Data invalid due to media change */
 186         unsigned busy:1;        /* Used to prevent races */
 187         unsigned lockable:1;    /* Able to prevent media removal */
 188         unsigned locked:1;      /* Media removal disabled */
 189         unsigned borken:1;      /* Tell the Seagate driver to be
 190                                  * painfully slow on this device */
 191         unsigned disconnect:1;  /* can disconnect */
 192         unsigned soft_reset:1;  /* Uses soft reset option */
 193         unsigned sdtr:1;        /* Device supports SDTR messages */
 194         unsigned wdtr:1;        /* Device supports WDTR messages */
 195         unsigned ppr:1;         /* Device supports PPR messages */
 196         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 197         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 198         unsigned was_reset:1;   /* There was a bus reset on the bus for
 199                                  * this device */
 200         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 201                                      * because we did a bus reset. */
 202         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 203         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 204         unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 205         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 206         unsigned no_write_same:1;       /* no WRITE SAME command */
 207         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 208         unsigned use_16_for_sync:1;     /* Use sync (16) over sync (10) */
 209         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 210         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 211         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 212         unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 213         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 214         unsigned no_start_on_add:1;     /* do not issue start on add */
 215         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 216         unsigned no_start_on_resume:1; /* Do not issue START_STOP_UNIT on resume */
 217         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 218         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 219         unsigned select_no_atn:1;
 220         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 221         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 222         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 223         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 224                                            SD_LAST_BUGGY_SECTORS */
 225         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 226         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 227         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 228         unsigned security_supported:1;  /* Supports Security Protocols */
 229         unsigned is_visible:1;  /* is the device visible in sysfs */
 230         unsigned wce_default_on:1;      /* Cache is ON by default */
 231         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 232         unsigned broken_fua:1;          /* Don't set FUA bit */
 233         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 234         unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 235         unsigned rpm_autosuspend:1;     /* Enable runtime autosuspend at device
 236                                          * creation time */
 237         unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
 238         unsigned silence_suspend:1;     /* Do not print runtime PM related messages */
 239         unsigned no_vpd_size:1;         /* No VPD size reported in header */
 240
 241         unsigned cdl_supported:1;       /* Command duration limits supported */
 242         unsigned cdl_enable:1;          /* Enable/disable Command duration limits */
 243
 244         unsigned int queue_stopped;     /* request queue is quiesced */
 245         bool offline_already;           /* Device offline message logged */
 246
 247         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 248
 249         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 250         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 251         struct list_head event_list;    /* asserted events */
 252         struct work_struct event_work;
 253
 254         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 255 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 256
 257         atomic_t iorequest_cnt;
 258         atomic_t iodone_cnt;
 259         atomic_t ioerr_cnt;
 260         atomic_t iotmo_cnt;
 261
 262         struct device           sdev_gendev,
 263                                 sdev_dev;
 264
 265         struct work_struct      requeue_work;
 266
 267         struct scsi_device_handler *handler;
 268         void                    *handler_data;
 269
 270         size_t                  dma_drain_len;
 271         void                    *dma_drain_buf;
 272
 273         unsigned int            sg_timeout;
 274         unsigned int            sg_reserved_size;
 275
 276         struct bsg_device       *bsg_dev;
 277         unsigned char           access_state;
 278         struct mutex            state_mutex;
 279         enum scsi_device_state sdev_state;
 280         struct task_struct      *quiesced_by;
 281         unsigned long           sdev_data[];
 282 } __attribute__((aligned(sizeof(unsigned long))));
 283
 284 #define to_scsi_device(d)       \
 285         container_of(d, struct scsi_device, sdev_gendev)
 286 #define class_to_sdev(d)        \
 287         container_of(d, struct scsi_device, sdev_dev)
 288 #define transport_class_to_sdev(class_dev) \
 289         to_scsi_device(class_dev->parent)
 290
 291 #define sdev_dbg(sdev, fmt, a...) \
 292         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 293
 294 /*
 295  * like scmd_printk, but the device name is passed in
 296  * as a string pointer
 297  */
 298 __printf(4, 5) void
 299 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 300                 const char *, ...);
 301
 302 #define sdev_printk(l, sdev, fmt, a...)                         \
 303         sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 304
 305 __printf(3, 4) void
 306 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 307
 308 #define scmd_dbg(scmd, fmt, a...)                                       \
 309         do {                                                            \
 310                 struct request *__rq = scsi_cmd_to_rq((scmd));          \
 311                                                                         \
 312                 if (__rq->q->disk)                                      \
 313                         sdev_dbg((scmd)->device, "[%s] " fmt,           \
 314                                  __rq->q->disk->disk_name, ##a);        \
 315                 else                                                    \
 316                         sdev_dbg((scmd)->device, fmt, ##a);             \
 317         } while (0)
 318
 319 enum scsi_target_state {
 320         STARGET_CREATED = 1,
 321         STARGET_RUNNING,
 322         STARGET_REMOVE,
 323         STARGET_CREATED_REMOVE,
 324         STARGET_DEL,
 325 };
 326
 327 /*
 328  * scsi_target: representation of a scsi target, for now, this is only
 329  * used for single_lun devices. If no one has active IO to the target,
 330  * starget_sdev_user is NULL, else it points to the active sdev.
 331  */
 332 struct scsi_target {
 333         struct scsi_device      *starget_sdev_user;
 334         struct list_head        siblings;
 335         struct list_head        devices;
 336         struct device           dev;
 337         struct kref             reap_ref; /* last put renders target invisible */
 338         unsigned int            channel;
 339         unsigned int            id; /* target id ... replace
 340                                      * scsi_device.id eventually */
 341         unsigned int            create:1; /* signal that it needs to be added */
 342         unsigned int            single_lun:1;   /* Indicates we should only
 343                                                  * allow I/O to one of the luns
 344                                                  * for the device at a time. */
 345         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 346                                                  * means no lun present. */
 347         unsigned int            no_report_luns:1;       /* Don't use
 348                                                  * REPORT LUNS for scanning. */
 349         unsigned int            expecting_lun_change:1; /* A device has reported
 350                                                  * a 3F/0E UA, other devices on
 351                                                  * the same target will also. */
 352         /* commands actually active on LLD. */
 353         atomic_t                target_busy;
 354         atomic_t                target_blocked;
 355
 356         /*
 357          * LLDs should set this in the slave_alloc host template callout.
 358          * If set to zero then there is not limit.
 359          */
 360         unsigned int            can_queue;
 361         unsigned int            max_target_blocked;
 362 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 363
 364         char                    scsi_level;
 365         enum scsi_target_state  state;
 366         void                    *hostdata; /* available to low-level driver */
 367         unsigned long           starget_data[]; /* for the transport */
 368         /* starget_data must be the last element!!!! */
 369 } __attribute__((aligned(sizeof(unsigned long))));
 370
 371 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 372 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 373 {
 374         return to_scsi_target(sdev->sdev_gendev.parent);
 375 }
 376 #define transport_class_to_starget(class_dev) \
 377         to_scsi_target(class_dev->parent)
 378
 379 #define starget_printk(prefix, starget, fmt, a...)      \
 380         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 381
 382 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 383                 uint, uint, u64, void *hostdata);
 384 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 385                            uint target, u64 lun);
 386 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 387 extern void scsi_remove_device(struct scsi_device *);
 388 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 389 void scsi_attach_vpd(struct scsi_device *sdev);
 390 void scsi_cdl_check(struct scsi_device *sdev);
 391 int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
 392
 393 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 394 extern int __must_check scsi_device_get(struct scsi_device *);
 395 extern void scsi_device_put(struct scsi_device *);
 396 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 397                                               uint, uint, u64);
 398 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 399                                                 uint, uint, u64);
 400 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 401                                                         u64);
 402 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 403                                                           u64);
 404 extern void starget_for_each_device(struct scsi_target *, void *,
 405                      void (*fn)(struct scsi_device *, void *));
 406 extern void __starget_for_each_device(struct scsi_target *, void *,
 407                                       void (*fn)(struct scsi_device *,
 408                                                  void *));
 409
 410 /* only exposed to implement shost_for_each_device */
 411 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 412                                                   struct scsi_device *);
 413
 414 /**
 415  * shost_for_each_device - iterate over all devices of a host
 416  * @sdev: the &struct scsi_device to use as a cursor
 417  * @shost: the &struct scsi_host to iterate over
 418  *
 419  * Iterator that returns each device attached to @shost.  This loop
 420  * takes a reference on each device and releases it at the end.  If
 421  * you break out of the loop, you must call scsi_device_put(sdev).
 422  */
 423 #define shost_for_each_device(sdev, shost) \
 424         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 425              (sdev); \
 426              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 427
 428 /**
 429  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 430  * @sdev: the &struct scsi_device to use as a cursor
 431  * @shost: the &struct scsi_host to iterate over
 432  *
 433  * Iterator that returns each device attached to @shost.  It does _not_
 434  * take a reference on the scsi_device, so the whole loop must be
 435  * protected by shost->host_lock.
 436  *
 437  * Note: The only reason to use this is because you need to access the
 438  * device list in interrupt context.  Otherwise you really want to use
 439  * shost_for_each_device instead.
 440  */
 441 #define __shost_for_each_device(sdev, shost) \
 442         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 443
 444 extern int scsi_change_queue_depth(struct scsi_device *, int);
 445 extern int scsi_track_queue_full(struct scsi_device *, int);
 446
 447 extern int scsi_set_medium_removal(struct scsi_device *, char);
 448
 449 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 450                     int subpage, unsigned char *buffer, int len, int timeout,
 451                     int retries, struct scsi_mode_data *data,
 452                     struct scsi_sense_hdr *);
 453 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 454                             unsigned char *buffer, int len, int timeout,
 455                             int retries, struct scsi_mode_data *data,
 456                             struct scsi_sense_hdr *);
 457 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 458                                 int retries, struct scsi_sense_hdr *sshdr);
 459 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 460                              int buf_len);
 461 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 462                        unsigned int len, unsigned char opcode,
 463                        unsigned short sa);
 464 extern int scsi_device_set_state(struct scsi_device *sdev,
 465                                  enum scsi_device_state state);
 466 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 467                                           gfp_t gfpflags);
 468 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 469 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 470                           enum scsi_device_event evt_type, gfp_t gfpflags);
 471 extern int scsi_device_quiesce(struct scsi_device *sdev);
 472 extern void scsi_device_resume(struct scsi_device *sdev);
 473 extern void scsi_target_quiesce(struct scsi_target *);
 474 extern void scsi_target_resume(struct scsi_target *);
 475 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 476                              unsigned int id, u64 lun,
 477                              enum scsi_scan_mode rescan);
 478 extern void scsi_target_reap(struct scsi_target *);
 479 void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
 480 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 481 extern void scsi_remove_target(struct device *);
 482 extern const char *scsi_device_state_name(enum scsi_device_state);
 483 extern int scsi_is_sdev_device(const struct device *);
 484 extern int scsi_is_target_device(const struct device *);
 485 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 486
 487 /* Optional arguments to scsi_execute_cmd */
 488 struct scsi_exec_args {
 489         unsigned char *sense;           /* sense buffer */
 490         unsigned int sense_len;         /* sense buffer len */
 491         struct scsi_sense_hdr *sshdr;   /* decoded sense header */
 492         blk_mq_req_flags_t req_flags;   /* BLK_MQ_REQ flags */
 493         int scmd_flags;                 /* SCMD flags */
 494         int *resid;                     /* residual length */
 495 };
 496
 497 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
 498                      blk_opf_t opf, void *buffer, unsigned int bufflen,
 499                      int timeout, int retries,
 500                      const struct scsi_exec_args *args);
 501
 502 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 503 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 504 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 505 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 506
 507 #ifdef CONFIG_PM
 508 extern int scsi_autopm_get_device(struct scsi_device *);
 509 extern void scsi_autopm_put_device(struct scsi_device *);
 510 #else
 511 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 512 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 513 #endif /* CONFIG_PM */
 514
 515 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 516 {
 517         return device_reprobe(&sdev->sdev_gendev);
 518 }
 519
 520 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 521 {
 522         return sdev->channel;
 523 }
 524
 525 static inline unsigned int sdev_id(struct scsi_device *sdev)
 526 {
 527         return sdev->id;
 528 }
 529
 530 #define scmd_id(scmd) sdev_id((scmd)->device)
 531 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 532
 533 /*
 534  * checks for positions of the SCSI state machine
 535  */
 536 static inline int scsi_device_online(struct scsi_device *sdev)
 537 {
 538         return (sdev->sdev_state != SDEV_OFFLINE &&
 539                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 540                 sdev->sdev_state != SDEV_DEL);
 541 }
 542 static inline int scsi_device_blocked(struct scsi_device *sdev)
 543 {
 544         return sdev->sdev_state == SDEV_BLOCK ||
 545                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 546 }
 547 static inline int scsi_device_created(struct scsi_device *sdev)
 548 {
 549         return sdev->sdev_state == SDEV_CREATED ||
 550                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 551 }
 552
 553 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 554 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 555                                         enum scsi_device_state new_state);
 556
 557 /* accessor functions for the SCSI parameters */
 558 static inline int scsi_device_sync(struct scsi_device *sdev)
 559 {
 560         return sdev->sdtr;
 561 }
 562 static inline int scsi_device_wide(struct scsi_device *sdev)
 563 {
 564         return sdev->wdtr;
 565 }
 566 static inline int scsi_device_dt(struct scsi_device *sdev)
 567 {
 568         return sdev->ppr;
 569 }
 570 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 571 {
 572         if (sdev->inquiry_len < 57)
 573                 return 0;
 574         return (sdev->inquiry[56] & 0x0c) == 0x04;
 575 }
 576 static inline int scsi_device_ius(struct scsi_device *sdev)
 577 {
 578         if (sdev->inquiry_len < 57)
 579                 return 0;
 580         return sdev->inquiry[56] & 0x01;
 581 }
 582 static inline int scsi_device_qas(struct scsi_device *sdev)
 583 {
 584         if (sdev->inquiry_len < 57)
 585                 return 0;
 586         return sdev->inquiry[56] & 0x02;
 587 }
 588 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 589 {
 590         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 591 }
 592
 593 static inline int scsi_device_protection(struct scsi_device *sdev)
 594 {
 595         if (sdev->no_dif)
 596                 return 0;
 597
 598         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 599 }
 600
 601 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 602 {
 603         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 604 }
 605
 606 /**
 607  * scsi_device_supports_vpd - test if a device supports VPD pages
 608  * @sdev: the &struct scsi_device to test
 609  *
 610  * If the 'try_vpd_pages' flag is set it takes precedence.
 611  * Otherwise we will assume VPD pages are supported if the
 612  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 613  */
 614 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 615 {
 616         /* Attempt VPD inquiry if the device blacklist explicitly calls
 617          * for it.
 618          */
 619         if (sdev->try_vpd_pages)
 620                 return 1;
 621         /*
 622          * Although VPD inquiries can go to SCSI-2 type devices,
 623          * some USB ones crash on receiving them, and the pages
 624          * we currently ask for are mandatory for SPC-2 and beyond
 625          */
 626         if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 627                 return 1;
 628         return 0;
 629 }
 630
 631 static inline int scsi_device_busy(struct scsi_device *sdev)
 632 {
 633         return sbitmap_weight(&sdev->budget_map);
 634 }
 635
 636 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 637         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 638 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 639
 640 #endif /* _SCSI_SCSI_DEVICE_H */