include/scsi/scsi_device.h

   1 #ifndef _SCSI_SCSI_DEVICE_H
   2 #define _SCSI_SCSI_DEVICE_H
   3
   4 #include <linux/list.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/workqueue.h>
   7 #include <linux/blkdev.h>
   8 #include <scsi/scsi.h>
   9 #include <linux/atomic.h>
  10
  11 struct device;
  12 struct request_queue;
  13 struct scsi_cmnd;
  14 struct scsi_lun;
  15 struct scsi_sense_hdr;
  16
  17 struct scsi_mode_data {
  18         __u32   length;
  19         __u16   block_descriptor_length;
  20         __u8    medium_type;
  21         __u8    device_specific;
  22         __u8    header_length;
  23         __u8    longlba:1;
  24 };
  25
  26 /*
  27  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  28  * (for the ascii descriptions) and the state model enforcer:
  29  * scsi_lib:scsi_device_set_state().
  30  */
  31 enum scsi_device_state {
  32         SDEV_CREATED = 1,       /* device created but not added to sysfs
  33                                  * Only internal commands allowed (for inq) */
  34         SDEV_RUNNING,           /* device properly configured
  35                                  * All commands allowed */
  36         SDEV_CANCEL,            /* beginning to delete device
  37                                  * Only error handler commands allowed */
  38         SDEV_DEL,               /* device deleted
  39                                  * no commands allowed */
  40         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  41                                  * will be accepted, only specials (which
  42                                  * originate in the mid-layer) */
  43         SDEV_OFFLINE,           /* Device offlined (by error handling or
  44                                  * user request */
  45         SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
  46         SDEV_BLOCK,             /* Device blocked by scsi lld.  No
  47                                  * scsi commands from user or midlayer
  48                                  * should be issued to the scsi
  49                                  * lld. */
  50         SDEV_CREATED_BLOCK,     /* same as above but for created devices */
  51 };
  52
  53 enum scsi_device_event {
  54         SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  55
  56         SDEV_EVT_LAST           = SDEV_EVT_MEDIA_CHANGE,
  57         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  58 };
  59
  60 struct scsi_event {
  61         enum scsi_device_event  evt_type;
  62         struct list_head        node;
  63
  64         /* put union of data structures, for non-simple event types,
  65          * here
  66          */
  67 };
  68
  69 struct scsi_device {
  70         struct Scsi_Host *host;
  71         struct request_queue *request_queue;
  72
  73         /* the next two are protected by the host->host_lock */
  74         struct list_head    siblings;   /* list of all devices on this host */
  75         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  76
  77         /* this is now protected by the request_queue->queue_lock */
  78         unsigned int device_busy;       /* commands actually active on
  79                                          * low-level. protected by queue_lock. */
  80         spinlock_t list_lock;
  81         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  82         struct list_head starved_entry;
  83         struct scsi_cmnd *current_cmnd; /* currently active command */
  84         unsigned short queue_depth;     /* How deep of a queue we want */
  85         unsigned short max_queue_depth; /* max queue depth */
  86         unsigned short last_queue_full_depth; /* These two are used by */
  87         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  88         unsigned long last_queue_full_time;     /* last queue full time */
  89         unsigned long queue_ramp_up_period;     /* ramp up period in jiffies */
  90 #define SCSI_DEFAULT_RAMP_UP_PERIOD     (120 * HZ)
  91
  92         unsigned long last_queue_ramp_up;       /* last queue ramp up time */
  93
  94         unsigned int id, lun, channel;
  95
  96         unsigned int manufacturer;      /* Manufacturer of device, for using
  97                                          * vendor-specific cmd's */
  98         unsigned sector_size;   /* size in bytes */
  99
 100         void *hostdata;         /* available to low-level driver */
 101         char type;
 102         char scsi_level;
 103         char inq_periph_qual;   /* PQ from INQUIRY data */
 104         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
 105         unsigned char * inquiry;        /* INQUIRY response data */
 106         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 107         const char * model;             /* ... after scan; point to static string */
 108         const char * rev;               /* ... "nullnullnullnull" before scan */
 109         unsigned char current_tag;      /* current tag */
 110         struct scsi_target      *sdev_target;   /* used only for single_lun */
 111
 112         unsigned int    sdev_bflags; /* black/white flags as also found in
 113                                  * scsi_devinfo.[hc]. For now used only to
 114                                  * pass settings from slave_alloc to scsi
 115                                  * core. */
 116         unsigned writeable:1;
 117         unsigned removable:1;
 118         unsigned changed:1;     /* Data invalid due to media change */
 119         unsigned busy:1;        /* Used to prevent races */
 120         unsigned lockable:1;    /* Able to prevent media removal */
 121         unsigned locked:1;      /* Media removal disabled */
 122         unsigned borken:1;      /* Tell the Seagate driver to be
 123                                  * painfully slow on this device */
 124         unsigned disconnect:1;  /* can disconnect */
 125         unsigned soft_reset:1;  /* Uses soft reset option */
 126         unsigned sdtr:1;        /* Device supports SDTR messages */
 127         unsigned wdtr:1;        /* Device supports WDTR messages */
 128         unsigned ppr:1;         /* Device supports PPR messages */
 129         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 130         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 131         unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
 132         unsigned was_reset:1;   /* There was a bus reset on the bus for
 133                                  * this device */
 134         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 135                                      * because we did a bus reset. */
 136         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 137         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 138         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 139         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 140         unsigned skip_vpd_pages:1;      /* do not read VPD pages */
 141         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 142         unsigned no_start_on_add:1;     /* do not issue start on add */
 143         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 144         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 145         unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
 146         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 147         unsigned select_no_atn:1;
 148         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 149         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 150         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 151         unsigned last_sector_bug:1;     /* do not use multisector accesses on
 152                                            SD_LAST_BUGGY_SECTORS */
 153         unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
 154         unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 155         unsigned try_rc_10_first:1;     /* Try READ_CAPACACITY_10 first */
 156         unsigned is_visible:1;  /* is the device visible in sysfs */
 157         unsigned can_power_off:1; /* Device supports runtime power off */
 158         unsigned wce_default_on:1;      /* Cache is ON by default */
 159         unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 160
 161         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 162         struct list_head event_list;    /* asserted events */
 163         struct work_struct event_work;
 164
 165         unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 166
 167         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 168 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 169
 170         atomic_t iorequest_cnt;
 171         atomic_t iodone_cnt;
 172         atomic_t ioerr_cnt;
 173
 174         struct device           sdev_gendev,
 175                                 sdev_dev;
 176
 177         struct execute_work     ew; /* used to get process context on put */
 178         struct work_struct      requeue_work;
 179
 180         struct scsi_dh_data     *scsi_dh_data;
 181         enum scsi_device_state sdev_state;
 182         unsigned long           sdev_data[0];
 183 } __attribute__((aligned(sizeof(unsigned long))));
 184
 185 struct scsi_dh_devlist {
 186         char *vendor;
 187         char *model;
 188 };
 189
 190 typedef void (*activate_complete)(void *, int);
 191 struct scsi_device_handler {
 192         /* Used by the infrastructure */
 193         struct list_head list; /* list of scsi_device_handlers */
 194
 195         /* Filled by the hardware handler */
 196         struct module *module;
 197         const char *name;
 198         const struct scsi_dh_devlist *devlist;
 199         int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
 200         int (*attach)(struct scsi_device *);
 201         void (*detach)(struct scsi_device *);
 202         int (*activate)(struct scsi_device *, activate_complete, void *);
 203         int (*prep_fn)(struct scsi_device *, struct request *);
 204         int (*set_params)(struct scsi_device *, const char *);
 205         bool (*match)(struct scsi_device *);
 206 };
 207
 208 struct scsi_dh_data {
 209         struct scsi_device_handler *scsi_dh;
 210         struct scsi_device *sdev;
 211         struct kref kref;
 212         char buf[0];
 213 };
 214
 215 #define to_scsi_device(d)       \
 216         container_of(d, struct scsi_device, sdev_gendev)
 217 #define class_to_sdev(d)        \
 218         container_of(d, struct scsi_device, sdev_dev)
 219 #define transport_class_to_sdev(class_dev) \
 220         to_scsi_device(class_dev->parent)
 221
 222 #define sdev_printk(prefix, sdev, fmt, a...)    \
 223         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 224
 225 #define scmd_printk(prefix, scmd, fmt, a...)                            \
 226         (scmd)->request->rq_disk ?                                      \
 227         sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 228                     (scmd)->request->rq_disk->disk_name, ##a) :         \
 229         sdev_printk(prefix, (scmd)->device, fmt, ##a)
 230
 231 enum scsi_target_state {
 232         STARGET_CREATED = 1,
 233         STARGET_RUNNING,
 234         STARGET_DEL,
 235 };
 236
 237 /*
 238  * scsi_target: representation of a scsi target, for now, this is only
 239  * used for single_lun devices. If no one has active IO to the target,
 240  * starget_sdev_user is NULL, else it points to the active sdev.
 241  */
 242 struct scsi_target {
 243         struct scsi_device      *starget_sdev_user;
 244         struct list_head        siblings;
 245         struct list_head        devices;
 246         struct device           dev;
 247         unsigned int            reap_ref; /* protected by the host lock */
 248         unsigned int            channel;
 249         unsigned int            id; /* target id ... replace
 250                                      * scsi_device.id eventually */
 251         unsigned int            create:1; /* signal that it needs to be added */
 252         unsigned int            single_lun:1;   /* Indicates we should only
 253                                                  * allow I/O to one of the luns
 254                                                  * for the device at a time. */
 255         unsigned int            pdt_1f_for_no_lun:1;    /* PDT = 0x1f
 256                                                  * means no lun present. */
 257         unsigned int            no_report_luns:1;       /* Don't use
 258                                                  * REPORT LUNS for scanning. */
 259         /* commands actually active on LLD. protected by host lock. */
 260         unsigned int            target_busy;
 261         /*
 262          * LLDs should set this in the slave_alloc host template callout.
 263          * If set to zero then there is not limit.
 264          */
 265         unsigned int            can_queue;
 266         unsigned int            target_blocked;
 267         unsigned int            max_target_blocked;
 268 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 269
 270         char                    scsi_level;
 271         struct execute_work     ew;
 272         enum scsi_target_state  state;
 273         void                    *hostdata; /* available to low-level driver */
 274         unsigned long           starget_data[0]; /* for the transport */
 275         /* starget_data must be the last element!!!! */
 276 } __attribute__((aligned(sizeof(unsigned long))));
 277
 278 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 279 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 280 {
 281         return to_scsi_target(sdev->sdev_gendev.parent);
 282 }
 283 #define transport_class_to_starget(class_dev) \
 284         to_scsi_target(class_dev->parent)
 285
 286 #define starget_printk(prefix, starget, fmt, a...)      \
 287         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 288
 289 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 290                 uint, uint, uint, void *hostdata);
 291 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 292                            uint target, uint lun);
 293 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 294 extern void scsi_remove_device(struct scsi_device *);
 295 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 296
 297 extern int scsi_device_get(struct scsi_device *);
 298 extern void scsi_device_put(struct scsi_device *);
 299 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 300                                               uint, uint, uint);
 301 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 302                                                 uint, uint, uint);
 303 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 304                                                         uint);
 305 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 306                                                           uint);
 307 extern void starget_for_each_device(struct scsi_target *, void *,
 308                      void (*fn)(struct scsi_device *, void *));
 309 extern void __starget_for_each_device(struct scsi_target *, void *,
 310                                       void (*fn)(struct scsi_device *,
 311                                                  void *));
 312
 313 /* only exposed to implement shost_for_each_device */
 314 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 315                                                   struct scsi_device *);
 316
 317 /**
 318  * shost_for_each_device - iterate over all devices of a host
 319  * @sdev: the &struct scsi_device to use as a cursor
 320  * @shost: the &struct scsi_host to iterate over
 321  *
 322  * Iterator that returns each device attached to @shost.  This loop
 323  * takes a reference on each device and releases it at the end.  If
 324  * you break out of the loop, you must call scsi_device_put(sdev).
 325  */
 326 #define shost_for_each_device(sdev, shost) \
 327         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 328              (sdev); \
 329              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 330
 331 /**
 332  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 333  * @sdev: the &struct scsi_device to use as a cursor
 334  * @shost: the &struct scsi_host to iterate over
 335  *
 336  * Iterator that returns each device attached to @shost.  It does _not_
 337  * take a reference on the scsi_device, so the whole loop must be
 338  * protected by shost->host_lock.
 339  *
 340  * Note: The only reason to use this is because you need to access the
 341  * device list in interrupt context.  Otherwise you really want to use
 342  * shost_for_each_device instead.
 343  */
 344 #define __shost_for_each_device(sdev, shost) \
 345         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 346
 347 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 348 extern int scsi_track_queue_full(struct scsi_device *, int);
 349
 350 extern int scsi_set_medium_removal(struct scsi_device *, char);
 351
 352 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 353                            unsigned char *buffer, int len, int timeout,
 354                            int retries, struct scsi_mode_data *data,
 355                            struct scsi_sense_hdr *);
 356 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 357                             int modepage, unsigned char *buffer, int len,
 358                             int timeout, int retries,
 359                             struct scsi_mode_data *data,
 360                             struct scsi_sense_hdr *);
 361 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 362                                 int retries, struct scsi_sense_hdr *sshdr);
 363 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
 364                              int buf_len);
 365 extern int scsi_device_set_state(struct scsi_device *sdev,
 366                                  enum scsi_device_state state);
 367 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 368                                           gfp_t gfpflags);
 369 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 370 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 371                           enum scsi_device_event evt_type, gfp_t gfpflags);
 372 extern int scsi_device_quiesce(struct scsi_device *sdev);
 373 extern void scsi_device_resume(struct scsi_device *sdev);
 374 extern void scsi_target_quiesce(struct scsi_target *);
 375 extern void scsi_target_resume(struct scsi_target *);
 376 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 377                              unsigned int id, unsigned int lun, int rescan);
 378 extern void scsi_target_reap(struct scsi_target *);
 379 extern void scsi_target_block(struct device *);
 380 extern void scsi_target_unblock(struct device *, enum scsi_device_state);
 381 extern void scsi_remove_target(struct device *);
 382 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 383 extern int scsilun_to_int(struct scsi_lun *);
 384 extern const char *scsi_device_state_name(enum scsi_device_state);
 385 extern int scsi_is_sdev_device(const struct device *);
 386 extern int scsi_is_target_device(const struct device *);
 387 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 388                         int data_direction, void *buffer, unsigned bufflen,
 389                         unsigned char *sense, int timeout, int retries,
 390                         int flag, int *resid);
 391 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
 392                             int data_direction, void *buffer, unsigned bufflen,
 393                             struct scsi_sense_hdr *, int timeout, int retries,
 394                             int *resid);
 395
 396 #ifdef CONFIG_PM_RUNTIME
 397 extern int scsi_autopm_get_device(struct scsi_device *);
 398 extern void scsi_autopm_put_device(struct scsi_device *);
 399 #else
 400 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
 401 static inline void scsi_autopm_put_device(struct scsi_device *d) {}
 402 #endif /* CONFIG_PM_RUNTIME */
 403
 404 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 405 {
 406         return device_reprobe(&sdev->sdev_gendev);
 407 }
 408
 409 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 410 {
 411         return sdev->channel;
 412 }
 413
 414 static inline unsigned int sdev_id(struct scsi_device *sdev)
 415 {
 416         return sdev->id;
 417 }
 418
 419 #define scmd_id(scmd) sdev_id((scmd)->device)
 420 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 421
 422 /*
 423  * checks for positions of the SCSI state machine
 424  */
 425 static inline int scsi_device_online(struct scsi_device *sdev)
 426 {
 427         return (sdev->sdev_state != SDEV_OFFLINE &&
 428                 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
 429                 sdev->sdev_state != SDEV_DEL);
 430 }
 431 static inline int scsi_device_blocked(struct scsi_device *sdev)
 432 {
 433         return sdev->sdev_state == SDEV_BLOCK ||
 434                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 435 }
 436 static inline int scsi_device_created(struct scsi_device *sdev)
 437 {
 438         return sdev->sdev_state == SDEV_CREATED ||
 439                 sdev->sdev_state == SDEV_CREATED_BLOCK;
 440 }
 441
 442 /* accessor functions for the SCSI parameters */
 443 static inline int scsi_device_sync(struct scsi_device *sdev)
 444 {
 445         return sdev->sdtr;
 446 }
 447 static inline int scsi_device_wide(struct scsi_device *sdev)
 448 {
 449         return sdev->wdtr;
 450 }
 451 static inline int scsi_device_dt(struct scsi_device *sdev)
 452 {
 453         return sdev->ppr;
 454 }
 455 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 456 {
 457         if (sdev->inquiry_len < 57)
 458                 return 0;
 459         return (sdev->inquiry[56] & 0x0c) == 0x04;
 460 }
 461 static inline int scsi_device_ius(struct scsi_device *sdev)
 462 {
 463         if (sdev->inquiry_len < 57)
 464                 return 0;
 465         return sdev->inquiry[56] & 0x01;
 466 }
 467 static inline int scsi_device_qas(struct scsi_device *sdev)
 468 {
 469         if (sdev->inquiry_len < 57)
 470                 return 0;
 471         return sdev->inquiry[56] & 0x02;
 472 }
 473 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 474 {
 475         return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
 476 }
 477
 478 static inline int scsi_device_protection(struct scsi_device *sdev)
 479 {
 480         if (sdev->no_dif)
 481                 return 0;
 482
 483         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 484 }
 485
 486 static inline int scsi_device_tpgs(struct scsi_device *sdev)
 487 {
 488         return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
 489 }
 490
 491 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 492         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 493 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 494
 495 #endif /* _SCSI_SCSI_DEVICE_H */