include/linux/bsg.h

   1 #ifndef BSG_H
   2 #define BSG_H
   3
   4 struct sg_io_v4 {
   5         s32 guard;              /* [i] 'Q' to differentiate from v3 */
   6         u32 protocol;           /* [i] 0 -> SCSI , .... */
   7         u32 subprotocol;        /* [i] 0 -> SCSI command, 1 -> SCSI task
   8                                    management function, .... */
   9
  10         u32 request_len;        /* [i] in bytes */
  11         u64 request;            /* [i], [*i] {SCSI: cdb} */
  12         u32 request_attr;       /* [i] {SCSI: task attribute} */
  13         u32 request_tag;        /* [i] {SCSI: task tag (only if flagged)} */
  14         u32 request_priority;   /* [i] {SCSI: task priority} */
  15         u32 max_response_len;   /* [i] in bytes */
  16         u64 response;           /* [i], [*o] {SCSI: (auto)sense data} */
  17
  18         /* "din_" for data in (from device); "dout_" for data out (to device) */
  19         u32 dout_xfer_len;      /* [i] bytes to be transferred to device */
  20         u32 din_xfer_len;       /* [i] bytes to be transferred from device */
  21         u64 dout_xferp;         /* [i], [*i] */
  22         u64 din_xferp;          /* [i], [*o] */
  23
  24         u32 timeout;            /* [i] units: millisecond */
  25         u32 flags;              /* [i] bit mask */
  26         u64 usr_ptr;            /* [i->o] unused internally */
  27         u32 spare_in;           /* [i] */
  28
  29         u32 driver_status;      /* [o] 0 -> ok */
  30         u32 transport_status;   /* [o] 0 -> ok */
  31         u32 device_status;      /* [o] {SCSI: command completion status} */
  32         u32 retry_delay;        /* [o] {SCSI: status auxiliary information} */
  33         u32 info;               /* [o] additional information */
  34         u32 duration;           /* [o] time to complete, in milliseconds */
  35         u32 response_len;       /* [o] bytes of response actually written */
  36         s32 din_resid;          /* [o] actual_din_xfer_len - din_xfer_len */
  37         u32 generated_tag;      /* [o] {SCSI: task tag that transport chose} */
  38         u32 spare_out;          /* [o] */
  39
  40         u32 padding;
  41 };
  42
  43 #ifdef __KERNEL__
  44
  45 #if defined(CONFIG_BLK_DEV_BSG)
  46 struct bsg_class_device {
  47         struct class_device *class_dev;
  48         struct device *dev;
  49         int minor;
  50         struct gendisk *disk;
  51         struct list_head list;
  52 };
  53
  54 extern int bsg_register_disk(struct gendisk *);
  55 extern void bsg_unregister_disk(struct gendisk *);
  56 #else
  57 struct bsg_class_device { };
  58 #define bsg_register_disk(disk)         (0)
  59 #define bsg_unregister_disk(disk)       do { } while (0)
  60 #endif
  61
  62 #endif /* __KERNEL__ */
  63
  64 #endif