include/linux/bsg.h

   1 #ifndef BSG_H
   2 #define BSG_H
   3
   4 #define BSG_PROTOCOL_SCSI               0
   5
   6 #define BSG_SUB_PROTOCOL_SCSI_CMD       0
   7 #define BSG_SUB_PROTOCOL_SCSI_TMF       1
   8 #define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
   9
  10 struct sg_io_v4 {
  11         __s32 guard;            /* [i] 'Q' to differentiate from v3 */
  12         __u32 protocol;         /* [i] 0 -> SCSI , .... */
  13         __u32 subprotocol;      /* [i] 0 -> SCSI command, 1 -> SCSI task
  14                                    management function, .... */
  15
  16         __u32 request_len;      /* [i] in bytes */
  17         __u64 request;          /* [i], [*i] {SCSI: cdb} */
  18         __u64 request_tag;      /* [i] {SCSI: task tag (only if flagged)} */
  19         __u32 request_attr;     /* [i] {SCSI: task attribute} */
  20         __u32 request_priority; /* [i] {SCSI: task priority} */
  21         __u32 request_extra;    /* [i] {spare, for padding} */
  22         __u32 max_response_len; /* [i] in bytes */
  23         __u64 response;         /* [i], [*o] {SCSI: (auto)sense data} */
  24
  25         /* "dout_": data out (to device); "din_": data in (from device) */
  26         __u32 dout_iovec_count; /* [i] 0 -> "flat" dout transfer else
  27                                    dout_xfer points to array of iovec */
  28         __u32 dout_xfer_len;    /* [i] bytes to be transferred to device */
  29         __u32 din_iovec_count;  /* [i] 0 -> "flat" din transfer */
  30         __u32 din_xfer_len;     /* [i] bytes to be transferred from device */
  31         __u64 dout_xferp;       /* [i], [*i] */
  32         __u64 din_xferp;        /* [i], [*o] */
  33
  34         __u32 timeout;          /* [i] units: millisecond */
  35         __u32 flags;            /* [i] bit mask */
  36         __u64 usr_ptr;          /* [i->o] unused internally */
  37         __u32 spare_in;         /* [i] */
  38
  39         __u32 driver_status;    /* [o] 0 -> ok */
  40         __u32 transport_status; /* [o] 0 -> ok */
  41         __u32 device_status;    /* [o] {SCSI: command completion status} */
  42         __u32 retry_delay;      /* [o] {SCSI: status auxiliary information} */
  43         __u32 info;             /* [o] additional information */
  44         __u32 duration;         /* [o] time to complete, in milliseconds */
  45         __u32 response_len;     /* [o] bytes of response actually written */
  46         __s32 din_resid;        /* [o] din_xfer_len - actual_din_xfer_len */
  47         __s32 dout_resid;       /* [o] dout_xfer_len - actual_dout_xfer_len */
  48         __u64 generated_tag;    /* [o] {SCSI: transport generated task tag} */
  49         __u32 spare_out;        /* [o] */
  50
  51         __u32 padding;
  52 };
  53
  54 #ifdef __KERNEL__
  55
  56 #if defined(CONFIG_BLK_DEV_BSG)
  57 struct bsg_class_device {
  58         struct device *class_dev;
  59         struct device *parent;
  60         int minor;
  61         struct request_queue *queue;
  62         struct kref ref;
  63         void (*release)(struct device *);
  64 };
  65
  66 extern int bsg_register_queue(struct request_queue *q,
  67                               struct device *parent, const char *name,
  68                               void (*release)(struct device *));
  69 extern void bsg_unregister_queue(struct request_queue *);
  70 #else
  71 static inline int bsg_register_queue(struct request_queue *q,
  72                                      struct device *parent, const char *name,
  73                                      void (*release)(struct device *))
  74 {
  75         return 0;
  76 }
  77 static inline void bsg_unregister_queue(struct request_queue *q)
  78 {
  79 }
  80 #endif
  81
  82 #endif /* __KERNEL__ */
  83
  84 #endif