LXR linux/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
  10struct 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)
  57struct bsg_class_device {
  58        struct class_device *class_dev;
  59        struct device *dev;
  60        int minor;
  61        struct request_queue *queue;
  62};
  63
  64extern int bsg_register_queue(struct request_queue *, struct device *, const char *);
  65extern void bsg_unregister_queue(struct request_queue *);
  66#else
  67static inline int bsg_register_queue(struct request_queue * rq, struct device *dev, const char *name)
  68{
  69        return 0;
  70}
  71static inline void bsg_unregister_queue(struct request_queue *rq)
  72{
  73}
  74#endif
  75
  76#endif /* __KERNEL__ */
  77
  78#endif
  79