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 was_reset:1;   /* There was a bus reset on the bus for
 126                                  * this device */
 127         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
 128                                      * because we did a bus reset. */
 129         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
 130         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
 131         unsigned skip_ms_page_8:1;      /* do not use MODE SENSE page 0x08 */
 132         unsigned skip_ms_page_3f:1;     /* do not use MODE SENSE page 0x3f */
 133         unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
 134         unsigned no_start_on_add:1;     /* do not issue start on add */
 135         unsigned allow_restart:1; /* issue START_UNIT in error handler */
 136         unsigned manage_start_stop:1;   /* Let HLD (sd) manage start/stop */
 137         unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
 138         unsigned select_no_atn:1;
 139         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
 140         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
 141         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
 142         unsigned last_sector_bug:1;     /* Always read last sector in a 1 sector read */
 143
 144         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 145         struct list_head event_list;    /* asserted events */
 146         struct work_struct event_work;
 147
 148         unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
 149
 150         unsigned int max_device_blocked; /* what device_blocked counts down from  */
 151 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
 152
 153         atomic_t iorequest_cnt;
 154         atomic_t iodone_cnt;
 155         atomic_t ioerr_cnt;
 156
 157         int timeout;
 158
 159         struct device           sdev_gendev;
 160         struct class_device     sdev_classdev;
 161
 162         struct execute_work     ew; /* used to get process context on put */
 163
 164         enum scsi_device_state sdev_state;
 165         unsigned long           sdev_data[0];
 166 } __attribute__((aligned(sizeof(unsigned long))));
 167 #define to_scsi_device(d)       \
 168         container_of(d, struct scsi_device, sdev_gendev)
 169 #define class_to_sdev(d)        \
 170         container_of(d, struct scsi_device, sdev_classdev)
 171 #define transport_class_to_sdev(class_dev) \
 172         to_scsi_device(class_dev->dev)
 173
 174 #define sdev_printk(prefix, sdev, fmt, a...)    \
 175         dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
 176
 177 #define scmd_printk(prefix, scmd, fmt, a...)                            \
 178         (scmd)->request->rq_disk ?                                      \
 179         sdev_printk(prefix, (scmd)->device, "[%s] " fmt,                \
 180                     (scmd)->request->rq_disk->disk_name, ##a) :         \
 181         sdev_printk(prefix, (scmd)->device, fmt, ##a)
 182
 183 enum scsi_target_state {
 184         STARGET_RUNNING = 1,
 185         STARGET_DEL,
 186 };
 187
 188 /*
 189  * scsi_target: representation of a scsi target, for now, this is only
 190  * used for single_lun devices. If no one has active IO to the target,
 191  * starget_sdev_user is NULL, else it points to the active sdev.
 192  */
 193 struct scsi_target {
 194         struct scsi_device      *starget_sdev_user;
 195         struct list_head        siblings;
 196         struct list_head        devices;
 197         struct device           dev;
 198         unsigned int            reap_ref; /* protected by the host lock */
 199         unsigned int            channel;
 200         unsigned int            id; /* target id ... replace
 201                                      * scsi_device.id eventually */
 202         unsigned int            create:1; /* signal that it needs to be added */
 203         unsigned int            single_lun:1;   /* Indicates we should only
 204                                                  * allow I/O to one of the luns
 205                                                  * for the device at a time. */
 206         unsigned int            pdt_1f_for_no_lun;      /* PDT = 0x1f */
 207                                                 /* means no lun present */
 208
 209         char                    scsi_level;
 210         struct execute_work     ew;
 211         enum scsi_target_state  state;
 212         void                    *hostdata; /* available to low-level driver */
 213         unsigned long           starget_data[0]; /* for the transport */
 214         /* starget_data must be the last element!!!! */
 215 } __attribute__((aligned(sizeof(unsigned long))));
 216
 217 #define to_scsi_target(d)       container_of(d, struct scsi_target, dev)
 218 static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
 219 {
 220         return to_scsi_target(sdev->sdev_gendev.parent);
 221 }
 222 #define transport_class_to_starget(class_dev) \
 223         to_scsi_target(class_dev->dev)
 224
 225 #define starget_printk(prefix, starget, fmt, a...)      \
 226         dev_printk(prefix, &(starget)->dev, fmt, ##a)
 227
 228 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 229                 uint, uint, uint, void *hostdata);
 230 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 231                            uint target, uint lun);
 232 extern void scsi_remove_device(struct scsi_device *);
 233
 234 extern int scsi_device_get(struct scsi_device *);
 235 extern void scsi_device_put(struct scsi_device *);
 236 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
 237                                               uint, uint, uint);
 238 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
 239                                                 uint, uint, uint);
 240 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
 241                                                         uint);
 242 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
 243                                                           uint);
 244 extern void starget_for_each_device(struct scsi_target *, void *,
 245                      void (*fn)(struct scsi_device *, void *));
 246 extern void __starget_for_each_device(struct scsi_target *, void *,
 247                                       void (*fn)(struct scsi_device *,
 248                                                  void *));
 249
 250 /* only exposed to implement shost_for_each_device */
 251 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
 252                                                   struct scsi_device *);
 253
 254 /**
 255  * shost_for_each_device - iterate over all devices of a host
 256  * @sdev: the &struct scsi_device to use as a cursor
 257  * @shost: the &struct scsi_host to iterate over
 258  *
 259  * Iterator that returns each device attached to @shost.  This loop
 260  * takes a reference on each device and releases it at the end.  If
 261  * you break out of the loop, you must call scsi_device_put(sdev).
 262  */
 263 #define shost_for_each_device(sdev, shost) \
 264         for ((sdev) = __scsi_iterate_devices((shost), NULL); \
 265              (sdev); \
 266              (sdev) = __scsi_iterate_devices((shost), (sdev)))
 267
 268 /**
 269  * __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
 270  * @sdev: the &struct scsi_device to use as a cursor
 271  * @shost: the &struct scsi_host to iterate over
 272  *
 273  * Iterator that returns each device attached to @shost.  It does _not_
 274  * take a reference on the scsi_device, so the whole loop must be
 275  * protected by shost->host_lock.
 276  *
 277  * Note: The only reason to use this is because you need to access the
 278  * device list in interrupt context.  Otherwise you really want to use
 279  * shost_for_each_device instead.
 280  */
 281 #define __shost_for_each_device(sdev, shost) \
 282         list_for_each_entry((sdev), &((shost)->__devices), siblings)
 283
 284 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 285 extern int scsi_track_queue_full(struct scsi_device *, int);
 286
 287 extern int scsi_set_medium_removal(struct scsi_device *, char);
 288
 289 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 290                            unsigned char *buffer, int len, int timeout,
 291                            int retries, struct scsi_mode_data *data,
 292                            struct scsi_sense_hdr *);
 293 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
 294                             int modepage, unsigned char *buffer, int len,
 295                             int timeout, int retries,
 296                             struct scsi_mode_data *data,
 297                             struct scsi_sense_hdr *);
 298 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
 299                                 int retries, struct scsi_sense_hdr *sshdr);
 300 extern int scsi_device_set_state(struct scsi_device *sdev,
 301                                  enum scsi_device_state state);
 302 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
 303                                           gfp_t gfpflags);
 304 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
 305 extern void sdev_evt_send_simple(struct scsi_device *sdev,
 306                           enum scsi_device_event evt_type, gfp_t gfpflags);
 307 extern int scsi_device_quiesce(struct scsi_device *sdev);
 308 extern void scsi_device_resume(struct scsi_device *sdev);
 309 extern void scsi_target_quiesce(struct scsi_target *);
 310 extern void scsi_target_resume(struct scsi_target *);
 311 extern void scsi_scan_target(struct device *parent, unsigned int channel,
 312                              unsigned int id, unsigned int lun, int rescan);
 313 extern void scsi_target_reap(struct scsi_target *);
 314 extern void scsi_target_block(struct device *);
 315 extern void scsi_target_unblock(struct device *);
 316 extern void scsi_remove_target(struct device *);
 317 extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 318 extern int scsilun_to_int(struct scsi_lun *);
 319 extern const char *scsi_device_state_name(enum scsi_device_state);
 320 extern int scsi_is_sdev_device(const struct device *);
 321 extern int scsi_is_target_device(const struct device *);
 322 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
 323                         int data_direction, void *buffer, unsigned bufflen,
 324                         unsigned char *sense, int timeout, int retries,
 325                         int flag);
 326 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
 327                             int data_direction, void *buffer, unsigned bufflen,
 328                             struct scsi_sense_hdr *, int timeout, int retries);
 329 extern int scsi_execute_async(struct scsi_device *sdev,
 330                               const unsigned char *cmd, int cmd_len, int data_direction,
 331                               void *buffer, unsigned bufflen, int use_sg,
 332                               int timeout, int retries, void *privdata,
 333                               void (*done)(void *, char *, int, int),
 334                               gfp_t gfp);
 335
 336 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
 337 {
 338         return device_reprobe(&sdev->sdev_gendev);
 339 }
 340
 341 static inline unsigned int sdev_channel(struct scsi_device *sdev)
 342 {
 343         return sdev->channel;
 344 }
 345
 346 static inline unsigned int sdev_id(struct scsi_device *sdev)
 347 {
 348         return sdev->id;
 349 }
 350
 351 #define scmd_id(scmd) sdev_id((scmd)->device)
 352 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 353
 354 static inline int scsi_device_online(struct scsi_device *sdev)
 355 {
 356         return sdev->sdev_state != SDEV_OFFLINE;
 357 }
 358
 359 /* accessor functions for the SCSI parameters */
 360 static inline int scsi_device_sync(struct scsi_device *sdev)
 361 {
 362         return sdev->sdtr;
 363 }
 364 static inline int scsi_device_wide(struct scsi_device *sdev)
 365 {
 366         return sdev->wdtr;
 367 }
 368 static inline int scsi_device_dt(struct scsi_device *sdev)
 369 {
 370         return sdev->ppr;
 371 }
 372 static inline int scsi_device_dt_only(struct scsi_device *sdev)
 373 {
 374         if (sdev->inquiry_len < 57)
 375                 return 0;
 376         return (sdev->inquiry[56] & 0x0c) == 0x04;
 377 }
 378 static inline int scsi_device_ius(struct scsi_device *sdev)
 379 {
 380         if (sdev->inquiry_len < 57)
 381                 return 0;
 382         return sdev->inquiry[56] & 0x01;
 383 }
 384 static inline int scsi_device_qas(struct scsi_device *sdev)
 385 {
 386         if (sdev->inquiry_len < 57)
 387                 return 0;
 388         return sdev->inquiry[56] & 0x02;
 389 }
 390 static inline int scsi_device_enclosure(struct scsi_device *sdev)
 391 {
 392         return sdev->inquiry[6] & (1<<6);
 393 }
 394
 395 #define MODULE_ALIAS_SCSI_DEVICE(type) \
 396         MODULE_ALIAS("scsi:t-" __stringify(type) "*")
 397 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
 398
 399 #endif /* _SCSI_SCSI_DEVICE_H */