linux/include/linux/bsg.h
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   1#ifndef BSG_H
   2#define BSG_H
   3
   4#include <linux/types.h>
   5
   6#define BSG_PROTOCOL_SCSI               0
   7
   8#define BSG_SUB_PROTOCOL_SCSI_CMD       0
   9#define BSG_SUB_PROTOCOL_SCSI_TMF       1
  10#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
  11
  12/*
  13 * For flags member below
  14 * sg.h sg_io_hdr also has bits defined for it's flags member. However
  15 * none of these bits are implemented/used by bsg. The bits below are
  16 * allocated to not conflict with sg.h ones anyway.
  17 */
  18#define BSG_FLAG_Q_AT_TAIL 0x10 /* default, == 0 at this bit, is Q_AT_HEAD */
  19
  20struct sg_io_v4 {
  21        __s32 guard;            /* [i] 'Q' to differentiate from v3 */
  22        __u32 protocol;         /* [i] 0 -> SCSI , .... */
  23        __u32 subprotocol;      /* [i] 0 -> SCSI command, 1 -> SCSI task
  24                                   management function, .... */
  25
  26        __u32 request_len;      /* [i] in bytes */
  27        __u64 request;          /* [i], [*i] {SCSI: cdb} */
  28        __u64 request_tag;      /* [i] {SCSI: task tag (only if flagged)} */
  29        __u32 request_attr;     /* [i] {SCSI: task attribute} */
  30        __u32 request_priority; /* [i] {SCSI: task priority} */
  31        __u32 request_extra;    /* [i] {spare, for padding} */
  32        __u32 max_response_len; /* [i] in bytes */
  33        __u64 response;         /* [i], [*o] {SCSI: (auto)sense data} */
  34
  35        /* "dout_": data out (to device); "din_": data in (from device) */
  36        __u32 dout_iovec_count; /* [i] 0 -> "flat" dout transfer else
  37                                   dout_xfer points to array of iovec */
  38        __u32 dout_xfer_len;    /* [i] bytes to be transferred to device */
  39        __u32 din_iovec_count;  /* [i] 0 -> "flat" din transfer */
  40        __u32 din_xfer_len;     /* [i] bytes to be transferred from device */
  41        __u64 dout_xferp;       /* [i], [*i] */
  42        __u64 din_xferp;        /* [i], [*o] */
  43
  44        __u32 timeout;          /* [i] units: millisecond */
  45        __u32 flags;            /* [i] bit mask */
  46        __u64 usr_ptr;          /* [i->o] unused internally */
  47        __u32 spare_in;         /* [i] */
  48
  49        __u32 driver_status;    /* [o] 0 -> ok */
  50        __u32 transport_status; /* [o] 0 -> ok */
  51        __u32 device_status;    /* [o] {SCSI: command completion status} */
  52        __u32 retry_delay;      /* [o] {SCSI: status auxiliary information} */
  53        __u32 info;             /* [o] additional information */
  54        __u32 duration;         /* [o] time to complete, in milliseconds */
  55        __u32 response_len;     /* [o] bytes of response actually written */
  56        __s32 din_resid;        /* [o] din_xfer_len - actual_din_xfer_len */
  57        __s32 dout_resid;       /* [o] dout_xfer_len - actual_dout_xfer_len */
  58        __u64 generated_tag;    /* [o] {SCSI: transport generated task tag} */
  59        __u32 spare_out;        /* [o] */
  60
  61        __u32 padding;
  62};
  63
  64#ifdef __KERNEL__
  65
  66#if defined(CONFIG_BLK_DEV_BSG)
  67struct bsg_class_device {
  68        struct device *class_dev;
  69        struct device *parent;
  70        int minor;
  71        struct request_queue *queue;
  72        struct kref ref;
  73        void (*release)(struct device *);
  74};
  75
  76extern int bsg_register_queue(struct request_queue *q,
  77                              struct device *parent, const char *name,
  78                              void (*release)(struct device *));
  79extern void bsg_unregister_queue(struct request_queue *);
  80#else
  81static inline int bsg_register_queue(struct request_queue *q,
  82                                     struct device *parent, const char *name,
  83                                     void (*release)(struct device *))
  84{
  85        return 0;
  86}
  87static inline void bsg_unregister_queue(struct request_queue *q)
  88{
  89}
  90#endif
  91
  92#endif /* __KERNEL__ */
  93
  94#endif
  95
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