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/blkdev.h>
   9 #include <scsi/scsi.h>
  10 #include <linux/atomic.h>
  11
  12 struct device;
  13 struct request_queue;
  14 struct scsi_cmnd;
  15 struct scsi_lun;
  16 struct scsi_sense_hdr;
  17
  18 typedef __u64 __bitwise blist_flags_t;
  19
  20 #define SCSI_SENSE_BUFFERSIZE   96
  21
  22 struct scsi_mode_data {
  23         __u32   length;
  24         __u16   block_descriptor_length;
  25         __u8    medium_type;
  26         __u8    device_specific;
  27         __u8    header_length;
  28         __u8    longlba:1;
  29 };
  30
  31 /*
  32  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  33  * (for the ascii descriptions) and the state model enforcer:
  34  * scsi_lib:scsi_device_set_state().
  35  */
  36 enum scsi_device_state {
  37         SDEV_CREATED = 1,       /* device created but not added to sysfs
  38                                  * Only internal commands allowed (for inq) */
  39         SDEV_RUNNING,           /* device properly configured
  40                                  * All commands allowed */
  41         SDEV_CANCEL,            /* beginning to delete device
  42                                  * Only error handler commands allowed */
  43         SDEV_DEL,               /* device deleted
  44                                  * no commands allowed */
  45         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  46                                  * will be accepted, only specials (which
  47                                  * originate in the mid-layer) */
  48         SDEV_OFFLINE,           /* Device offlined (by error handling or
  49                                  * user request */
  50         SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  51         SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  52                                  * scsi commands from user or midlayer
  53                                  * should be issued to the scsi
  54                                  * lld. */
  55         SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  56 };
  57
  58 enum scsi_scan_mode {
  59         SCSI_SCAN_INITIAL = 0,
  60         SCSI_SCAN_RESCAN,
  61         SCSI_SCAN_MANUAL,
  62 };
  63
  64 enum scsi_device_event {
  65         SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  66         SDEV_EVT_INQUIRY_CHANGE_REPORTED,               /* 3F 03  UA reported */
  67         SDEV_EVT_CAPACITY_CHANGE_REPORTED,              /* 2A 09  UA reported */
  68         SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED,       /* 38 07  UA reported */
  69         SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED,        /* 2A 01  UA reported */
  70         SDEV_EVT_LUN_CHANGE_REPORTED,                   /* 3F 0E  UA reported */
  71         SDEV_EVT_ALUA_STATE_CHANGE_REPORTED,            /* 2A 06  UA reported */
  72         SDEV_EVT_POWER_ON_RESET_OCCURRED,               /* 29 00  UA reported */
  73
  74         SDEV_EVT_FIRST          = SDEV_EVT_MEDIA_CHANGE,
  75         SDEV_EVT_LAST           = SDEV_EVT_POWER_ON_RESET_OCCURRED,
  76
  77         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  78 };
  79
  80 struct scsi_event {
  81         enum scsi_device_event  evt_type;
  82         struct list_head        node;
  83
  84         /* put union of data structures, for non-simple event types,
  85          * here
  86          */
  87 };
  88
  89 /**
  90  * struct scsi_vpd - SCSI Vital Product Data
  91  * @rcu: For kfree_rcu().
  92  * @len: Length in bytes of @data.
  93  * @data: VPD data as defined in various T10 SCSI standard documents.
  94  */
  95 struct scsi_vpd {
  96         struct rcu_head rcu;
  97         int             len;
  98         unsigned char   data[];
  99 };
 100
 101 struct scsi_device {
 102         struct Scsi_Host *host;
 103         struct request_queue *request_queue;
 104
 105         /* the next two are protected by the host->host_lock */
 106         struct list_head    siblings;   /* list of all devices on this host */
 107         struct list_head    same_target_siblings; /* just the devices sharing same target id */
 108
 109         atomic_t device_busy;           /* commands actually active on LLDD */
 110         atomic_t device_blocked;        /* Device returned QUEUE_FULL. */
 111
 112         spinlock_t list_lock;
 113         struct list_head starved_entry;
 114         unsigned short queue_depth;     /* How deep of a queue we want */
 115         unsigned short max_queue_depth; /* max queue depth */
 116         unsigned short last_queue_full_depth; /* These two are used by */
 117         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
 118         unsigned long last_queue_full_time;     /* last queue full time */
 119         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
 120 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
 121
 122         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
 123
 124         unsigned int id, channel;
 125         u64 lun;
 126         unsigned int manufacturer;      /* Manufacturer of device, for using
 127                                          * vendor-specific cmd's */
 128         unsigned sector_size;   /* size in bytes */
 129
 130         void *hostdata;         /* available to low-level driver */
 131         unsigned char type;
 132         char scsi_level;
 133         char inq_periph_qual;   /* PQ from INQUIRY data */
 134         struct mutex inquiry_mutex;
 135         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 136         unsigned char * inquiry;        /* INQUIRY response data */
 137         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 138         const char * model;             /* ... after scan; point to static string */
 139         const char * rev;               /* ... "nullnullnullnull" before scan */
 140
 141 #define SCSI_VPD_PG_LEN                255
 142         struct scsi_vpd __rcu *vpd_pg0;
 143         struct scsi_vpd __rcu *vpd_pg83;
 144         struct scsi_vpd __rcu *vpd_pg80;
 145         struct scsi_vpd __rcu *vpd_pg89;
 146         unsigned char current_tag;      /* current tag */
 147         struct scsi_target      *sdev_target;   /* used only for single_lun */
 148
 149         blist_flags_t           sdev_bflags; /* black/white flags as also found in
 150                                  * scsi_devinfo.[hc]. For now used only to
 151                                  * pass settings from slave_alloc to scsi
 152                                  * core. */
 153         unsigned int eh_timeout; /* Error handling timeout */
 154         unsigned removable:1;
 155         unsigned changed:1;     /* Data invalid due to media change */
 156         unsigned busy:1;        /* Used to prevent races */
 157         unsigned lockable:1;    /* Able to prevent media removal */
 158         unsigned locked:1;      /* Media removal disabled */
 159         unsigned borken:1;      /* Tell the Seagate driver to be
 160                                  * painfully slow on this device */
 161         unsigned disconnect:1;  /* can disconnect */
 162         unsigned soft_reset:1;  /* Uses soft reset option */
 163         unsigned sdtr:1;        /* Device supports SDTR messages */
 164         unsigned wdtr:1;        /* Device supports WDTR messages */
 165         unsigned ppr:1;         /* Device supports PPR messages */
 166         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 167         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 168         unsigned was_reset:1;   /* There was a bus reset on the bus for
 169                                  * this device */
 170         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 171                                      * because we did a bus reset. */
 172         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 173         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 174         unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
 175         unsigned no_report_opcodes:1;   /* no REPORT SUPPORTED OPERATION CODES */
 176         unsigned no_write_same:1;       /* no WRITE SAME command */
 177         unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
 178         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 179         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 180         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 181         unsigned try_vpd_pages:1;       /* attempt to read VPD pages */
 182         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 183         unsigned no_start_on_add:1;     /* do not issue start on add */
 184         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 185         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 186         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 187         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 188         unsigned select_no_atn:1;
 189         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 190         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 191         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 192         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 193                                            SD_LAST_BUGGY_SECTORS */
 194         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 195         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 196         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 197         unsigned security_supported:1;  /* Supports Security Protocols */
 198         unsigned is_visible:1;  /* is the device visible in sysfs */
 199         unsigned wce_default_on:1;      /* Cache is ON by default */
 200         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 201         unsigned broken_fua:1;          /* Don't set FUA bit */
 202         unsigned lun_in_cdb:1;          /* Store LUN bits in CDB[1] */
 203         unsigned unmap_limit_for_ws:1;  /* Use the UNMAP limit for WRITE SAME */
 204         unsigned rpm_autosuspend:1;     /* Enable runtime autosuspend at device
 205                                          * creation time */
 206
 207         bool offline_already;           /* Device offline message logged */
 208
 209         atomic_t disk_events_disable_depth; /* disable depth for disk events */
 210
 211         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 212         DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
 213         struct list_head event_list;    /* asserted events */
 214         struct work_struct event_work;
 215
 216         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 217 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 218
 219         atomic_t iorequest_cnt;
 220         atomic_t iodone_cnt;
 221         atomic_t ioerr_cnt;
 222
 223         struct device           sdev_gendev,
 224                                 sdev_dev;
 225
 226         struct execute_work     ew; /* used to get process context on put */
 227         struct work_struct      requeue_work;
 228
 229         struct scsi_device_handler *handler;
 230         void                    *handler_data;
 231
 232         size_t                  dma_drain_len;
 233         void                    *dma_drain_buf;
 234
 235         unsigned char           access_state;
 236         struct mutex            state_mutex;
 237         enum scsi_device_state sdev_state;
 238         struct task_struct      *quiesced_by;
 239         unsigned long           sdev_data[];
 240 } __attribute__((aligned(sizeof(unsigned long))));
 241
 242 #define to_scsi_device(d)       \
 243         container_of(d, struct scsi_device, sdev_gendev)
 244 #define class_to_sdev(d)        \
 245         container_of(d, struct scsi_device, sdev_dev)
 246 #define transport_class_to_sdev(class_dev) \
 247         to_scsi_device(class_dev->parent)
 248
 249 #define sdev_dbg(sdev, fmt, a...) \
 250         dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
 251
 252 /*
 253  * like scmd_printk, but the device name is passed in
 254  * as a string pointer
 255  */
 256 __printf(4, 5) void
 257 sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 258                 const char *, ...);
 259
 260 #define sdev_printk(l, sdev, fmt, a...)                         \
 261         sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 262
 263 __printf(3, 4) void
 264 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
 265
 266 #define scmd_dbg(scmd, fmt, a...)                                          \
 267         do {                                                               \
 268                 if ((scmd)->request->rq_disk)                              \
 269                         sdev_dbg((scmd)->device, "[%s] " fmt,              \
 270                                  (scmd)->request->rq_disk->disk_name, ##a);\
 271                 else                                                       \
 272                         sdev_dbg((scmd)->device, fmt, ##a);                \
 273         } while (0)
 274
 275 enum scsi_target_state {
 276         STARGET_CREATED = 1,
 277         STARGET_RUNNING,
 278         STARGET_REMOVE,
 279         STARGET_CREATED_REMOVE,
 280         STARGET_DEL,
 281 };
 282
 283 /*
 284  * scsi_target: representation of a scsi target, for now, this is only
 285  * used for single_lun devices. If no one has active IO to the target,
 286  * starget_sdev_user is NULL, else it points to the active sdev.
 287  */
 288 struct scsi_target {
 289         struct scsi_device      *starget_sdev_user;
 290         struct list_head        siblings;
 291         struct list_head        devices;
 292         struct device           dev;
 293         struct kref             reap_ref; /* last put renders target invisible */
 294         unsigned int            channel;
 295         unsigned int            id; /* target id ... replace
 296                                      * scsi_device.id eventually */
 297         unsigned int            create:1; /* signal that it needs to be added */
 298         unsigned int            single_lun:1;   /* Indicates we should only
 299                                                  * allow I/O to one of the luns
 300                                                  * for the device at a time. */
 301         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 302                                                  * means no lun present. */
 303         unsigned int            no_report_luns:1;       /* Don't use
 304                                                  * REPORT LUNS for scanning. */
 305         unsigned int            expecting_lun_change:1; /* A device has reported
 306                                                  * a 3F/0E UA, other devices on
 307                                                  * the same target will also. */
 308         /* commands actually active on LLD. */
 309         atomic_t                target_busy;
 310         atomic_t                target_blocked;
 311
 312         /*
 313          * LLDs should set this in the slave_alloc host template callout.
 314          * If set to zero then there is not limit.
 315          */
 316         unsigned int            can_queue;
 317         unsigned int            max_target_blocked;
 318 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 319
 320         char                    scsi_level;
 321         enum scsi_target_state  state;
 322         void                    *hostdata; /* available to low-level driver */
 323         unsigned long           starget_data[]; /* for the transport */
 324         /* starget_data must be the last element!!!! */
 325 } __attribute__((aligned(sizeof(unsigned long))));
 326
 327 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 328 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 329 {
 330         return to_scsi_target(sdev->sdev_gendev.parent);
 331 }
 332 #define transport_class_to_starget(class_dev) \
 333         to_scsi_target(class_dev->parent)
 334
 335 #define starget_printk(prefix, starget, fmt, a...)      \
 336         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 337
 338 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 339                 uint, uint, u64, void *hostdata);
 340 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 341                            uint target, u64 lun);
 342 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 343 extern void scsi_remove_device(struct scsi_device *);
 344 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 345 void scsi_attach_vpd(struct scsi_device *sdev);
 346
 347 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 348 extern int __must_check scsi_device_get(struct scsi_device *);
 349 extern void scsi_device_put(struct scsi_device *);
 350 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 351                                               uint, uint, u64);
 352 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 353                                                 uint, uint, u64);
 354 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 355                                                         u64);
 356 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 357                                                           u64);
 358 extern void starget_for_each_device(struct scsi_target *, void *,
 359                      void (*fn)(struct scsi_device *, void *));
 360 extern void __starget_for_each_device(struct scsi_target *, void *,
 361                                       void (*fn)(struct scsi_device *,
 362                                                  void *));
 363
 364 /* only exposed to implement shost_for_each_device */
 365 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 366                                                   struct scsi_device *);
 367
 368 /**
 369  * shost_for_each_device - iterate over all devices of a host
 370  * @sdev: the &struct scsi_device to use as a cursor
 371  * @shost: the &struct scsi_host to iterate over
 372  *
 373  * Iterator that returns each device attached to @shost.  This loop
 374  * takes a reference on each device and releases it at the end.  If
 375  * you break out of the loop, you must call scsi_device_put(sdev).
 376  */
 377 #define shost_for_each_device(sdev, shost) \
 378         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 379              (sdev); \
 380              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 381
 382 /**
 383  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 384  * @sdev: the &struct scsi_device to use as a cursor
 385  * @shost: the &struct scsi_host to iterate over
 386  *
 387  * Iterator that returns each device attached to @shost.  It does _not_
 388  * take a reference on the scsi_device, so the whole loop must be
 389  * protected by shost->host_lock.
 390  *
 391  * Note: The only reason to use this is because you need to access the
 392  * device list in interrupt context.  Otherwise you really want to use
 393  * shost_for_each_device instead.
 394  */
 395 #define __shost_for_each_device(sdev, shost) \
 396         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 397
 398 extern int scsi_change_queue_depth(struct scsi_device *, int);
 399 extern int scsi_track_queue_full(struct scsi_device *, int);
 400
 401 extern int scsi_set_medium_removal(struct scsi_device *, char);
 402
 403 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 404                            unsigned char *buffer, int len, int timeout,
 405                            int retries, struct scsi_mode_data *data,
 406                            struct scsi_sense_hdr *);
 407 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 408                             int modepage, unsigned char *buffer, int len,
 409                             int timeout, int retries,
 410                             struct scsi_mode_data *data,
 411                             struct scsi_sense_hdr *);
 412 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 413                                 int retries, struct scsi_sense_hdr *sshdr);
 414 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 415                              int buf_len);
 416 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 417                               unsigned int len, unsigned char opcode);
 418 extern int scsi_device_set_state(struct scsi_device *sdev,
 419                                  enum scsi_device_state state);
 420 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 421                                           gfp_t gfpflags);
 422 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 423 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 424                           enum scsi_device_event evt_type, gfp_t gfpflags);
 425 extern int scsi_device_quiesce(struct scsi_device *sdev);
 426 extern void scsi_device_resume(struct scsi_device *sdev);
 427 extern void scsi_target_quiesce(struct scsi_target *);
 428 extern void scsi_target_resume(struct scsi_target *);
 429 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 430                              unsigned int id, u64 lun,
 431                              enum scsi_scan_mode rescan);
 432 extern void scsi_target_reap(struct scsi_target *);
 433 extern void scsi_target_block(struct device *);
 434 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 435 extern void scsi_remove_target(struct device *);
 436 extern const char *scsi_device_state_name(enum scsi_device_state);
 437 extern int scsi_is_sdev_device(const struct device *);
 438 extern int scsi_is_target_device(const struct device *);
 439 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 440 extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 441                         int data_direction, void *buffer, unsigned bufflen,
 442                         unsigned char *sense, struct scsi_sense_hdr *sshdr,
 443                         int timeout, int retries, u64 flags,
 444                         req_flags_t rq_flags, int *resid);
 445 /* Make sure any sense buffer is the correct size. */
 446 #define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \
 447                      sshdr, timeout, retries, flags, rq_flags, resid)   \
 448 ({                                                                      \
 449         BUILD_BUG_ON((sense) != NULL &&                                 \
 450                      sizeof(sense) != SCSI_SENSE_BUFFERSIZE);           \
 451         __scsi_execute(sdev, cmd, data_direction, buffer, bufflen,      \
 452                        sense, sshdr, timeout, retries, flags, rq_flags, \
 453                        resid);                                          \
 454 })
 455 static inline int scsi_execute_req(struct scsi_device *sdev,
 456         const unsigned char *cmd, int data_direction, void *buffer,
 457         unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout,
 458         int retries, int *resid)
 459 {
 460         return scsi_execute(sdev, cmd, data_direction, buffer,
 461                 bufflen, NULL, sshdr, timeout, retries,  0, 0, resid);
 462 }
 463 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 464 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 465 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 466 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 467
 468 #ifdef CONFIG_PM
 469 extern int scsi_autopm_get_device(struct scsi_device *);
 470 extern void scsi_autopm_put_device(struct scsi_device *);
 471 #else
 472 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 473 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 474 #endif /* CONFIG_PM */
 475
 476 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 477 {
 478         return device_reprobe(&sdev->sdev_gendev);
 479 }
 480
 481 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 482 {
 483         return sdev->channel;
 484 }
 485
 486 static inline unsigned int sdev_id(struct scsi_device *sdev)
 487 {
 488         return sdev->id;
 489 }
 490
 491 #define scmd_id(scmd) sdev_id((scmd)->device)
 492 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 493
 494 /*
 495  * checks for positions of the SCSI state machine
 496  */
 497 static inline int scsi_device_online(struct scsi_device *sdev)
 498 {
 499         return (sdev->sdev_state != SDEV_OFFLINE &&
 500                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 501                 sdev->sdev_state != SDEV_DEL);
 502 }
 503 static inline int scsi_device_blocked(struct scsi_device *sdev)
 504 {
 505         return sdev->sdev_state == SDEV_BLOCK ||
 506                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 507 }
 508 static inline int scsi_device_created(struct scsi_device *sdev)
 509 {
 510         return sdev->sdev_state == SDEV_CREATED ||
 511                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 512 }
 513
 514 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 515 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 516                                         enum scsi_device_state new_state);
 517
 518 /* accessor functions for the SCSI parameters */
 519 static inline int scsi_device_sync(struct scsi_device *sdev)
 520 {
 521         return sdev->sdtr;
 522 }
 523 static inline int scsi_device_wide(struct scsi_device *sdev)
 524 {
 525         return sdev->wdtr;
 526 }
 527 static inline int scsi_device_dt(struct scsi_device *sdev)
 528 {
 529         return sdev->ppr;
 530 }
 531 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 532 {
 533         if (sdev->inquiry_len < 57)
 534                 return 0;
 535         return (sdev->inquiry[56] & 0x0c) == 0x04;
 536 }
 537 static inline int scsi_device_ius(struct scsi_device *sdev)
 538 {
 539         if (sdev->inquiry_len < 57)
 540                 return 0;
 541         return sdev->inquiry[56] & 0x01;
 542 }
 543 static inline int scsi_device_qas(struct scsi_device *sdev)
 544 {
 545         if (sdev->inquiry_len < 57)
 546                 return 0;
 547         return sdev->inquiry[56] & 0x02;
 548 }
 549 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 550 {
 551         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 552 }
 553
 554 static inline int scsi_device_protection(struct scsi_device *sdev)
 555 {
 556         if (sdev->no_dif)
 557                 return 0;
 558
 559         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 560 }
 561
 562 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 563 {
 564         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 565 }
 566
 567 /**
 568  * scsi_device_supports_vpd - test if a device supports VPD pages
 569  * @sdev: the &struct scsi_device to test
 570  *
 571  * If the 'try_vpd_pages' flag is set it takes precedence.
 572  * Otherwise we will assume VPD pages are supported if the
 573  * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
 574  */
 575 static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
 576 {
 577         /* Attempt VPD inquiry if the device blacklist explicitly calls
 578          * for it.
 579          */
 580         if (sdev->try_vpd_pages)
 581                 return 1;
 582         /*
 583          * Although VPD inquiries can go to SCSI-2 type devices,
 584          * some USB ones crash on receiving them, and the pages
 585          * we currently ask for are mandatory for SPC-2 and beyond
 586          */
 587         if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
 588                 return 1;
 589         return 0;
 590 }
 591
 592 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 593         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 594 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 595
 596 #endif /* _SCSI_SCSI_DEVICE_H */