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 #include <linux/sbitmap.h>
  12
  13 struct device;
  14 struct request_queue;
  15 struct scsi_cmnd;
  16 struct scsi_lun;
  17 struct scsi_sense_hdr;
  18
  19 typedef __u64 __bitwise blist_flags_t;
  20
  21 #define SCSI_SENSE_BUFFERSIZE   96
  22
  23 struct 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  */
  37 enum 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
  59 enum scsi_scan_mode {
  60         SCSI_SCAN_INITIAL = 0,
  61         SCSI_SCAN_RESCAN,
  62         SCSI_SCAN_MANUAL,
  63 };
  64
  65 enum 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
  81 struct 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  */
  96 struct scsi_vpd {
  97         struct rcu_head rcu;
  98         int             len;
  99         unsigned char   data[];
 100 };
 101
 102 struct 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
 259 sdev_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
 266 scmd_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
 277 enum 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  */
 290 struct 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)
 330 static 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
 340 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 341                 uint, uint, u64, void *hostdata);
 342 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 343                            uint target, u64 lun);
 344 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 345 extern void scsi_remove_device(struct scsi_device *);
 346 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 347 void scsi_attach_vpd(struct scsi_device *sdev);
 348
 349 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
 350 extern int __must_check scsi_device_get(struct scsi_device *);
 351 extern void scsi_device_put(struct scsi_device *);
 352 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 353                                               uint, uint, u64);
 354 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 355                                                 uint, uint, u64);
 356 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 357                                                         u64);
 358 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 359                                                           u64);
 360 extern void starget_for_each_device(struct scsi_target *, void *,
 361                      void (*fn)(struct scsi_device *, void *));
 362 extern 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 */
 367 extern 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
 400 extern int scsi_change_queue_depth(struct scsi_device *, int);
 401 extern int scsi_track_queue_full(struct scsi_device *, int);
 402
 403 extern int scsi_set_medium_removal(struct scsi_device *, char);
 404
 405 extern 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 *);
 409 extern 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 *);
 414 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 415                                 int retries, struct scsi_sense_hdr *sshdr);
 416 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 417                              int buf_len);
 418 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
 419                               unsigned int len, unsigned char opcode);
 420 extern int scsi_device_set_state(struct scsi_device *sdev,
 421                                  enum scsi_device_state state);
 422 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 423                                           gfp_t gfpflags);
 424 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 425 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 426                           enum scsi_device_event evt_type, gfp_t gfpflags);
 427 extern int scsi_device_quiesce(struct scsi_device *sdev);
 428 extern void scsi_device_resume(struct scsi_device *sdev);
 429 extern void scsi_target_quiesce(struct scsi_target *);
 430 extern void scsi_target_resume(struct scsi_target *);
 431 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 432                              unsigned int id, u64 lun,
 433                              enum scsi_scan_mode rescan);
 434 extern void scsi_target_reap(struct scsi_target *);
 435 extern void scsi_target_block(struct device *);
 436 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 437 extern void scsi_remove_target(struct device *);
 438 extern const char *scsi_device_state_name(enum scsi_device_state);
 439 extern int scsi_is_sdev_device(const struct device *);
 440 extern int scsi_is_target_device(const struct device *);
 441 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 442 extern 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 })
 457 static 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 }
 465 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 466 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 467 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
 468 extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
 469
 470 #ifdef CONFIG_PM
 471 extern int scsi_autopm_get_device(struct scsi_device *);
 472 extern void scsi_autopm_put_device(struct scsi_device *);
 473 #else
 474 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 475 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 476 #endif /* CONFIG_PM */
 477
 478 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 479 {
 480         return device_reprobe(&sdev->sdev_gendev);
 481 }
 482
 483 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 484 {
 485         return sdev->channel;
 486 }
 487
 488 static 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  */
 499 static 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 }
 505 static 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 }
 510 static 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
 516 int scsi_internal_device_block_nowait(struct scsi_device *sdev);
 517 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
 518                                         enum scsi_device_state new_state);
 519
 520 /* accessor functions for the SCSI parameters */
 521 static inline int scsi_device_sync(struct scsi_device *sdev)
 522 {
 523         return sdev->sdtr;
 524 }
 525 static inline int scsi_device_wide(struct scsi_device *sdev)
 526 {
 527         return sdev->wdtr;
 528 }
 529 static inline int scsi_device_dt(struct scsi_device *sdev)
 530 {
 531         return sdev->ppr;
 532 }
 533 static 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 }
 539 static 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 }
 545 static 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 }
 551 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 552 {
 553         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 554 }
 555
 556 static 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
 564 static 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  */
 577 static 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
 594 static 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 */