55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPIS390_CMB_H
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#define _UAPIS390_CMB_H
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#include <linux/types.h>
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/**
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* struct cmbdata - channel measurement block data for user space
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* @size: size of the stored data
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* @elapsed_time: time since last sampling
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* @ssch_rsch_count: number of ssch and rsch
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* @sample_count: number of samples
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* @device_connect_time: time of device connect
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* @function_pending_time: time of function pending
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* @device_disconnect_time: time of device disconnect
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* @control_unit_queuing_time: time of control unit queuing
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* @device_active_only_time: time of device active only
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* @device_busy_time: time of device busy (ext. format)
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* @initial_command_response_time: initial command response time (ext. format)
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*
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* All values are stored as 64 bit for simplicity, especially
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* in 32 bit emulation mode. All time values are normalized to
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* nanoseconds.
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* Currently, two formats are known, which differ by the size of
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* this structure, i.e. the last two members are only set when
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* the extended channel measurement facility (first shipped in
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* z990 machines) is activated.
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* Potentially, more fields could be added, which would result in a
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* new ioctl number.
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*/
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struct cmbdata {
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__u64 size;
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__u64 elapsed_time;
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/* basic and exended format: */
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__u64 ssch_rsch_count;
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__u64 sample_count;
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__u64 device_connect_time;
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__u64 function_pending_time;
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__u64 device_disconnect_time;
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__u64 control_unit_queuing_time;
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__u64 device_active_only_time;
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/* extended format only: */
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__u64 device_busy_time;
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__u64 initial_command_response_time;
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};
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/* enable channel measurement */
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#define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER, 32)
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/* enable channel measurement */
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#define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER, 33)
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/* read channel measurement data */
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#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata)
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#endif /* _UAPIS390_CMB_H */
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