diff options
Diffstat (limited to 'include/linux/bsg.h')
| -rw-r--r-- | include/linux/bsg.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/include/linux/bsg.h b/include/linux/bsg.h new file mode 100644 index 00000000..ecb4730d --- /dev/null +++ b/include/linux/bsg.h @@ -0,0 +1,94 @@ +#ifndef BSG_H +#define BSG_H + +#include <linux/types.h> + +#define BSG_PROTOCOL_SCSI 0 + +#define BSG_SUB_PROTOCOL_SCSI_CMD 0 +#define BSG_SUB_PROTOCOL_SCSI_TMF 1 +#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2 + +/* + * For flags member below + * sg.h sg_io_hdr also has bits defined for it's flags member. However + * none of these bits are implemented/used by bsg. The bits below are + * allocated to not conflict with sg.h ones anyway. + */ +#define BSG_FLAG_Q_AT_TAIL 0x10 /* default, == 0 at this bit, is Q_AT_HEAD */ + +struct sg_io_v4 { + __s32 guard; /* [i] 'Q' to differentiate from v3 */ + __u32 protocol; /* [i] 0 -> SCSI , .... */ + __u32 subprotocol; /* [i] 0 -> SCSI command, 1 -> SCSI task + management function, .... */ + + __u32 request_len; /* [i] in bytes */ + __u64 request; /* [i], [*i] {SCSI: cdb} */ + __u64 request_tag; /* [i] {SCSI: task tag (only if flagged)} */ + __u32 request_attr; /* [i] {SCSI: task attribute} */ + __u32 request_priority; /* [i] {SCSI: task priority} */ + __u32 request_extra; /* [i] {spare, for padding} */ + __u32 max_response_len; /* [i] in bytes */ + __u64 response; /* [i], [*o] {SCSI: (auto)sense data} */ + + /* "dout_": data out (to device); "din_": data in (from device) */ + __u32 dout_iovec_count; /* [i] 0 -> "flat" dout transfer else + dout_xfer points to array of iovec */ + __u32 dout_xfer_len; /* [i] bytes to be transferred to device */ + __u32 din_iovec_count; /* [i] 0 -> "flat" din transfer */ + __u32 din_xfer_len; /* [i] bytes to be transferred from device */ + __u64 dout_xferp; /* [i], [*i] */ + __u64 din_xferp; /* [i], [*o] */ + + __u32 timeout; /* [i] units: millisecond */ + __u32 flags; /* [i] bit mask */ + __u64 usr_ptr; /* [i->o] unused internally */ + __u32 spare_in; /* [i] */ + + __u32 driver_status; /* [o] 0 -> ok */ + __u32 transport_status; /* [o] 0 -> ok */ + __u32 device_status; /* [o] {SCSI: command completion status} */ + __u32 retry_delay; /* [o] {SCSI: status auxiliary information} */ + __u32 info; /* [o] additional information */ + __u32 duration; /* [o] time to complete, in milliseconds */ + __u32 response_len; /* [o] bytes of response actually written */ + __s32 din_resid; /* [o] din_xfer_len - actual_din_xfer_len */ + __s32 dout_resid; /* [o] dout_xfer_len - actual_dout_xfer_len */ + __u64 generated_tag; /* [o] {SCSI: transport generated task tag} */ + __u32 spare_out; /* [o] */ + + __u32 padding; +}; + +#ifdef __KERNEL__ + +#if defined(CONFIG_BLK_DEV_BSG) +struct bsg_class_device { + struct device *class_dev; + struct device *parent; + int minor; + struct request_queue *queue; + struct kref ref; + void (*release)(struct device *); +}; + +extern int bsg_register_queue(struct request_queue *q, + struct device *parent, const char *name, + void (*release)(struct device *)); +extern void bsg_unregister_queue(struct request_queue *); +#else +static inline int bsg_register_queue(struct request_queue *q, + struct device *parent, const char *name, + void (*release)(struct device *)) +{ + return 0; +} +static inline void bsg_unregister_queue(struct request_queue *q) +{ +} +#endif + +#endif /* __KERNEL__ */ + +#endif |