include/scsi/scsi_device.h

   1 #ifndef _SCSI_SCSI_DEVICE_H
   2 #define _SCSI_SCSI_DEVICE_H
   3
   4 #include <linux/device.h>
   5 #include <linux/list.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/blkdev.h>
   9 #include <asm/atomic.h>
  10
  11 struct request_queue;
  12 struct scsi_cmnd;
  13 struct scsi_lun;
  14 struct scsi_sense_hdr;
  15
  16 struct scsi_mode_data {
  17         __u32   length;
  18         __u16   block_descriptor_length;
  19         __u8    medium_type;
  20         __u8    device_specific;
  21         __u8    header_length;
  22         __u8    longlba:1;
  23 };
  24
  25 /*
  26  * sdev state: If you alter this, you also need to alter scsi_sysfs.c
  27  * (for the ascii descriptions) and the state model enforcer:
  28  * scsi_lib:scsi_device_set_state().
  29  */
  30 enum scsi_device_state {
  31         SDEV_CREATED = 1,       /* device created but not added to sysfs
  32                                  * Only internal commands allowed (for inq) */
  33         SDEV_RUNNING,           /* device properly configured
  34                                  * All commands allowed */
  35         SDEV_CANCEL,            /* beginning to delete device
  36                                  * Only error handler commands allowed */
  37         SDEV_DEL,               /* device deleted
  38                                  * no commands allowed */
  39         SDEV_QUIESCE,           /* Device quiescent.  No block commands
  40                                  * will be accepted, only specials (which
  41                                  * originate in the mid-layer) */
  42         SDEV_OFFLINE,           /* Device offlined (by error handling or
  43                                  * user request */
  44         SDEV_BLOCK,             /* Device blocked by scsi lld.  No scsi
  45                                  * commands from user or midlayer should be issued
  46                                  * to the scsi lld. */
  47 };
  48
  49 enum scsi_device_event {
  50         SDEV_EVT_MEDIA_CHANGE   = 1,    /* media has changed */
  51
  52         SDEV_EVT_LAST           = SDEV_EVT_MEDIA_CHANGE,
  53         SDEV_EVT_MAXBITS        = SDEV_EVT_LAST + 1
  54 };
  55
  56 struct scsi_event {
  57         enum scsi_device_event  evt_type;
  58         struct list_head        node;
  59
  60         /* put union of data structures, for non-simple event types,
  61          * here
  62          */
  63 };
  64
  65 struct scsi_device {
  66         struct Scsi_Host *host;
  67         struct request_queue *request_queue;
  68
  69         /* the next two are protected by the host->host_lock */
  70         struct list_head    siblings;   /* list of all devices on this host */
  71         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  72
  73         /* this is now protected by the request_queue->queue_lock */
  74         unsigned int device_busy;       /* commands actually active on
  75                                          * low-level. protected by queue_lock. */
  76         spinlock_t list_lock;
  77         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  78         struct list_head starved_entry;
  79         struct scsi_cmnd *current_cmnd; /* currently active command */
  80         unsigned short queue_depth;     /* How deep of a queue we want */
  81         unsigned short last_queue_full_depth; /* These two are used by */
  82         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  83         unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
  84                                            jiffie count on our counter, they
  85                                            could all be from the same event. */
  86
  87         unsigned int id, lun, channel;
  88
  89         unsigned int manufacturer;      /* Manufacturer of device, for using
  90                                          * vendor-specific cmd's */
  91         unsigned sector_size;   /* size in bytes */
  92
  93         void *hostdata;         /* available to low-level driver */
  94         char type;
  95         char scsi_level;
  96         char inq_periph_qual;   /* PQ from INQUIRY data */
  97         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
  98         unsigned char * inquiry;        /* INQUIRY response data */
  99         const char * vendor;            /* [back_compat] point into 'inquiry' ... */
 100         const char * model;             /* ... after scan; point to static string */
 101         const char * rev;               /* ... "nullnullnullnull" before scan */
 102         unsigned char current_tag;      /* current tag */
 103         struct scsi_target      *sdev_target;   /* used only for single_lun */
 104
 105         unsigned int    sdev_bflags; /* black/white flags as also found in
 106                                  * scsi_devinfo.[hc]. For now used only to
 107                                  * pass settings from slave_alloc to scsi
 108                                  * core. */
 109         unsigned writeable:1;
 110         unsigned removable:1;
 111         unsigned changed:1;     /* Data invalid due to media change */
 112         unsigned busy:1;        /* Used to prevent races */
 113         unsigned lockable:1;    /* Able to prevent media removal */
 114         unsigned locked:1;      /* Media removal disabled */
 115         unsigned borken:1;      /* Tell the Seagate driver to be
 116                                  * painfully slow on this device */
 117         unsigned disconnect:1;  /* can disconnect */
 118         unsigned soft_reset:1;  /* Uses soft reset option */
 119         unsigned sdtr:1;        /* Device supports SDTR messages */
 120         unsigned wdtr:1;        /* Device supports WDTR messages */
 121         unsigned ppr:1;         /* Device supports PPR messages */
 122         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 123         unsigned simple_tags:1; /* simple queue tag messages are enabled */
 124         unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
 125         unsigned single_lun:1;  /* Indicates we should only allow I/O to
 126                                  * one of the luns for the device at a
 127                                  * time. */
 128         unsigned was_reset:1;   /* There was a bus reset on the bus for
 129                                  * this device */
 130         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 131                                      * because we did a bus reset. */
 132         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 133         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 134         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 135         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 136         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 137         unsigned no_start_on_add:1;     /* do not issue start on add */
 138         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 139         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 140         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 141         unsigned select_no_atn:1;
 142         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 143         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 144         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 145
 146         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 147         struct list_head event_list;    /* asserted events */
 148         struct work_struct event_work;
 149
 150         unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 151
 152         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 153 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 154
 155         atomic_t iorequest_cnt;
 156         atomic_t iodone_cnt;
 157         atomic_t ioerr_cnt;
 158
 159         int timeout;
 160
 161         struct device           sdev_gendev;
 162         struct class_device     sdev_classdev;
 163
 164         struct execute_work     ew; /* used to get process context on put */
 165
 166         enum scsi_device_state sdev_state;
 167         unsigned long           sdev_data[0];
 168 } __attribute__((aligned(sizeof(unsigned long))));
 169 #define to_scsi_device(d)       \
 170         container_of(d, struct scsi_device, sdev_gendev)
 171 #define class_to_sdev(d)        \
 172         container_of(d, struct scsi_device, sdev_classdev)
 173 #define transport_class_to_sdev(class_dev) \
 174         to_scsi_device(class_dev->dev)
 175
 176 #define sdev_printk(prefix, sdev, fmt, a...)    \
 177         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 178
 179 #define scmd_printk(prefix, scmd, fmt, a...)                            \
 180         (scmd)->request->rq_disk ?                                      \
 181         sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 182                     (scmd)->request->rq_disk->disk_name, ##a) :         \
 183         sdev_printk(prefix, (scmd)->device, fmt, ##a)
 184
 185 enum scsi_target_state {
 186         STARGET_RUNNING = 1,
 187         STARGET_DEL,
 188 };
 189
 190 /*
 191  * scsi_target: representation of a scsi target, for now, this is only
 192  * used for single_lun devices. If no one has active IO to the target,
 193  * starget_sdev_user is NULL, else it points to the active sdev.
 194  */
 195 struct scsi_target {
 196         struct scsi_device      *starget_sdev_user;
 197         struct list_head        siblings;
 198         struct list_head        devices;
 199         struct device           dev;
 200         unsigned int            reap_ref; /* protected by the host lock */
 201         unsigned int            channel;
 202         unsigned int            id; /* target id ... replace
 203                                      * scsi_device.id eventually */
 204         unsigned int            create:1; /* signal that it needs to be added */
 205         unsigned int            pdt_1f_for_no_lun;      /* PDT = 0x1f */
 206                                                 /* means no lun present */
 207
 208         char                    scsi_level;
 209         struct execute_work     ew;
 210         enum scsi_target_state  state;
 211         void                    *hostdata; /* available to low-level driver */
 212         unsigned long           starget_data[0]; /* for the transport */
 213         /* starget_data must be the last element!!!! */
 214 } __attribute__((aligned(sizeof(unsigned long))));
 215
 216 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 217 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 218 {
 219         return to_scsi_target(sdev->sdev_gendev.parent);
 220 }
 221 #define transport_class_to_starget(class_dev) \
 222         to_scsi_target(class_dev->dev)
 223
 224 #define starget_printk(prefix, starget, fmt, a...)      \
 225         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 226
 227 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 228                 uint, uint, uint, void *hostdata);
 229 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 230                            uint target, uint lun);
 231 extern void scsi_remove_device(struct scsi_device *);
 232
 233 extern int scsi_device_get(struct scsi_device *);
 234 extern void scsi_device_put(struct scsi_device *);
 235 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 236                                               uint, uint, uint);
 237 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 238                                                 uint, uint, uint);
 239 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 240                                                         uint);
 241 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 242                                                           uint);
 243 extern void starget_for_each_device(struct scsi_target *, void *,
 244                      void (*fn)(struct scsi_device *, void *));
 245
 246 /* only exposed to implement shost_for_each_device */
 247 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 248                                                   struct scsi_device *);
 249
 250 /**
 251  * shost_for_each_device - iterate over all devices of a host
 252  * @sdev: the &struct scsi_device to use as a cursor
 253  * @shost: the &struct scsi_host to iterate over
 254  *
 255  * Iterator that returns each device attached to @shost.  This loop
 256  * takes a reference on each device and releases it at the end.  If
 257  * you break out of the loop, you must call scsi_device_put(sdev).
 258  */
 259 #define shost_for_each_device(sdev, shost) \
 260         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 261              (sdev); \
 262              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 263
 264 /**
 265  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 266  * @sdev: the &struct scsi_device to use as a cursor
 267  * @shost: the &struct scsi_host to iterate over
 268  *
 269  * Iterator that returns each device attached to @shost.  It does _not_
 270  * take a reference on the scsi_device, so the whole loop must be
 271  * protected by shost->host_lock.
 272  *
 273  * Note: The only reason to use this is because you need to access the
 274  * device list in interrupt context.  Otherwise you really want to use
 275  * shost_for_each_device instead.
 276  */
 277 #define __shost_for_each_device(sdev, shost) \
 278         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 279
 280 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 281 extern int scsi_track_queue_full(struct scsi_device *, int);
 282
 283 extern int scsi_set_medium_removal(struct scsi_device *, char);
 284
 285 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 286                            unsigned char *buffer, int len, int timeout,
 287                            int retries, struct scsi_mode_data *data,
 288                            struct scsi_sense_hdr *);
 289 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 290                             int modepage, unsigned char *buffer, int len,
 291                             int timeout, int retries,
 292                             struct scsi_mode_data *data,
 293                             struct scsi_sense_hdr *);
 294 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 295                                 int retries);
 296 extern int scsi_device_set_state(struct scsi_device *sdev,
 297                                  enum scsi_device_state state);
 298 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 299                                           gfp_t gfpflags);
 300 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 301 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 302                           enum scsi_device_event evt_type, gfp_t gfpflags);
 303 extern int scsi_device_quiesce(struct scsi_device *sdev);
 304 extern void scsi_device_resume(struct scsi_device *sdev);
 305 extern void scsi_target_quiesce(struct scsi_target *);
 306 extern void scsi_target_resume(struct scsi_target *);
 307 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 308                              unsigned int id, unsigned int lun, int rescan);
 309 extern void scsi_target_reap(struct scsi_target *);
 310 extern void scsi_target_block(struct device *);
 311 extern void scsi_target_unblock(struct device *);
 312 extern void scsi_remove_target(struct device *);
 313 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 314 extern int scsilun_to_int(struct scsi_lun *);
 315 extern const char *scsi_device_state_name(enum scsi_device_state);
 316 extern int scsi_is_sdev_device(const struct device *);
 317 extern int scsi_is_target_device(const struct device *);
 318 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 319                         int data_direction, void *buffer, unsigned bufflen,
 320                         unsigned char *sense, int timeout, int retries,
 321                         int flag);
 322 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
 323                             int data_direction, void *buffer, unsigned bufflen,
 324                             struct scsi_sense_hdr *, int timeout, int retries);
 325 extern int scsi_execute_async(struct scsi_device *sdev,
 326                               const unsigned char *cmd, int cmd_len, int data_direction,
 327                               void *buffer, unsigned bufflen, int use_sg,
 328                               int timeout, int retries, void *privdata,
 329                               void (*done)(void *, char *, int, int),
 330                               gfp_t gfp);
 331
 332 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 333 {
 334         return device_reprobe(&sdev->sdev_gendev);
 335 }
 336
 337 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 338 {
 339         return sdev->channel;
 340 }
 341
 342 static inline unsigned int sdev_id(struct scsi_device *sdev)
 343 {
 344         return sdev->id;
 345 }
 346
 347 #define scmd_id(scmd) sdev_id((scmd)->device)
 348 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 349
 350 static inline int scsi_device_online(struct scsi_device *sdev)
 351 {
 352         return sdev->sdev_state != SDEV_OFFLINE;
 353 }
 354
 355 /* accessor functions for the SCSI parameters */
 356 static inline int scsi_device_sync(struct scsi_device *sdev)
 357 {
 358         return sdev->sdtr;
 359 }
 360 static inline int scsi_device_wide(struct scsi_device *sdev)
 361 {
 362         return sdev->wdtr;
 363 }
 364 static inline int scsi_device_dt(struct scsi_device *sdev)
 365 {
 366         return sdev->ppr;
 367 }
 368 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 369 {
 370         if (sdev->inquiry_len < 57)
 371                 return 0;
 372         return (sdev->inquiry[56] & 0x0c) == 0x04;
 373 }
 374 static inline int scsi_device_ius(struct scsi_device *sdev)
 375 {
 376         if (sdev->inquiry_len < 57)
 377                 return 0;
 378         return sdev->inquiry[56] & 0x01;
 379 }
 380 static inline int scsi_device_qas(struct scsi_device *sdev)
 381 {
 382         if (sdev->inquiry_len < 57)
 383                 return 0;
 384         return sdev->inquiry[56] & 0x02;
 385 }
 386
 387 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 388         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 389 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 390
 391 #endif /* _SCSI_SCSI_DEVICE_H */