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54 lines
1.9 KiB
54 lines
1.9 KiB
/* 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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