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