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
20 struct 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)
67 struct 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
76 extern int bsg_register_queue(struct request_queue *q,
77 struct device *parent, const char *name,
78 void (*release)(struct device *));
79 extern void bsg_unregister_queue(struct request_queue *);
80 #else
bsg_register_queue(struct request_queue * q,struct device * parent,const char * name,void (* release)(struct device *))81 static 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 }
bsg_unregister_queue(struct request_queue * q)87 static inline void bsg_unregister_queue(struct request_queue *q)
88 {
89 }
90 #endif
91
92 #endif /* __KERNEL__ */
93
94 #endif
95