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
   8 struct request_queue;
   9 struct scsi_cmnd;
  10 struct scsi_mode_data;
  11
  12
  13 struct scsi_device {
  14         struct class_device     sdev_classdev;
  15
  16         struct list_head    siblings;   /* list of all devices on this host */
  17         struct list_head    same_target_siblings; /* just the devices sharing same target id */
  18         struct Scsi_Host *host;
  19         struct request_queue *request_queue;
  20         volatile unsigned short device_busy;    /* commands actually active on low-level */
  21         spinlock_t sdev_lock;           /* also the request queue_lock */
  22         spinlock_t list_lock;
  23         struct list_head cmd_list;      /* queue of in use SCSI Command structures */
  24         struct list_head starved_entry;
  25         struct scsi_cmnd *current_cmnd; /* currently active command */
  26         unsigned short queue_depth;     /* How deep of a queue we want */
  27         unsigned short last_queue_full_depth; /* These two are used by */
  28         unsigned short last_queue_full_count; /* scsi_track_queue_full() */
  29         unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same
  30                                            jiffie count on our counter, they
  31                                            could all be from the same event. */
  32
  33         unsigned int id, lun, channel;
  34
  35         unsigned int manufacturer;      /* Manufacturer of device, for using
  36                                          * vendor-specific cmd's */
  37         unsigned sector_size;   /* size in bytes */
  38
  39         int access_count;       /* Count of open channels/mounts */
  40
  41         void *hostdata;         /* available to low-level driver */
  42         char devfs_name[256];   /* devfs junk */
  43         char type;
  44         char scsi_level;
  45         unsigned char inquiry_len;      /* valid bytes in 'inquiry' */
  46         unsigned char * inquiry;        /* INQUIRY response data */
  47         char * vendor;          /* [back_compat] point into 'inquiry' ... */
  48         char * model;           /* ... after scan; point to static string */
  49         char * rev;             /* ... "nullnullnullnull" before scan */
  50         unsigned char current_tag;      /* current tag */
  51         struct scsi_target      *sdev_target;   /* used only for single_lun */
  52
  53         unsigned online:1;
  54
  55         unsigned writeable:1;
  56         unsigned removable:1;
  57         unsigned changed:1;     /* Data invalid due to media change */
  58         unsigned busy:1;        /* Used to prevent races */
  59         unsigned lockable:1;    /* Able to prevent media removal */
  60         unsigned locked:1;      /* Media removal disabled */
  61         unsigned borken:1;      /* Tell the Seagate driver to be
  62                                  * painfully slow on this device */
  63         unsigned disconnect:1;  /* can disconnect */
  64         unsigned soft_reset:1;  /* Uses soft reset option */
  65         unsigned sdtr:1;        /* Device supports SDTR messages */
  66         unsigned wdtr:1;        /* Device supports WDTR messages */
  67         unsigned ppr:1;         /* Device supports PPR messages */
  68         unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
  69         unsigned tagged_queue:1;/* This is going away!!!!  Look at simple_tags
  70                                    instead!!!  Please fix your driver now!! */
  71         unsigned simple_tags:1; /* simple queue tag messages are enabled */
  72         unsigned ordered_tags:1;/* ordered queue tag messages are enabled */
  73         unsigned single_lun:1;  /* Indicates we should only allow I/O to
  74                                  * one of the luns for the device at a
  75                                  * time. */
  76         unsigned was_reset:1;   /* There was a bus reset on the bus for
  77                                  * this device */
  78         unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
  79                                      * because we did a bus reset. */
  80         unsigned use_10_for_rw:1; /* first try 10-byte read / write */
  81         unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
  82         unsigned no_start_on_add:1;     /* do not issue start on add */
  83
  84         unsigned int device_blocked;    /* Device returned QUEUE_FULL. */
  85
  86         unsigned int max_device_blocked; /* what device_blocked counts down from  */
  87 #define SCSI_DEFAULT_DEVICE_BLOCKED     3
  88
  89         struct device sdev_driverfs_dev;
  90 };
  91 #define to_scsi_device(d)       \
  92         container_of(d, struct scsi_device, sdev_driverfs_dev)
  93
  94 extern struct scsi_device *scsi_add_device(struct Scsi_Host *,
  95                 uint, uint, uint);
  96 extern int scsi_remove_device(struct scsi_device *);
  97 extern void scsi_set_device_offline(struct scsi_device *);
  98
  99 extern int scsi_device_get(struct scsi_device *);
 100 extern void scsi_device_put(struct scsi_device *);
 101
 102 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int);
 103 extern int scsi_track_queue_full(struct scsi_device *, int);
 104
 105 extern int scsi_set_medium_removal(struct scsi_device *, char);
 106
 107 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 108                            unsigned char *buffer, int len, int timeout,
 109                            int retries, struct scsi_mode_data *data);
 110
 111 #endif /* _SCSI_SCSI_DEVICE_H */