16f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 29807f759SDavid Howells #ifndef _UAPIS390_CMB_H 39807f759SDavid Howells #define _UAPIS390_CMB_H 49807f759SDavid Howells 59807f759SDavid Howells #include <linux/types.h> 69807f759SDavid Howells 79807f759SDavid Howells /** 89807f759SDavid Howells * struct cmbdata - channel measurement block data for user space 99807f759SDavid Howells * @size: size of the stored data 109807f759SDavid Howells * @elapsed_time: time since last sampling 119807f759SDavid Howells * @ssch_rsch_count: number of ssch and rsch 129807f759SDavid Howells * @sample_count: number of samples 139807f759SDavid Howells * @device_connect_time: time of device connect 149807f759SDavid Howells * @function_pending_time: time of function pending 159807f759SDavid Howells * @device_disconnect_time: time of device disconnect 169807f759SDavid Howells * @control_unit_queuing_time: time of control unit queuing 179807f759SDavid Howells * @device_active_only_time: time of device active only 189807f759SDavid Howells * @device_busy_time: time of device busy (ext. format) 199807f759SDavid Howells * @initial_command_response_time: initial command response time (ext. format) 209807f759SDavid Howells * 219807f759SDavid Howells * All values are stored as 64 bit for simplicity, especially 229807f759SDavid Howells * in 32 bit emulation mode. All time values are normalized to 239807f759SDavid Howells * nanoseconds. 249807f759SDavid Howells * Currently, two formats are known, which differ by the size of 259807f759SDavid Howells * this structure, i.e. the last two members are only set when 269807f759SDavid Howells * the extended channel measurement facility (first shipped in 279807f759SDavid Howells * z990 machines) is activated. 289807f759SDavid Howells * Potentially, more fields could be added, which would result in a 299807f759SDavid Howells * new ioctl number. 309807f759SDavid Howells */ 319807f759SDavid Howells struct cmbdata { 329807f759SDavid Howells __u64 size; 339807f759SDavid Howells __u64 elapsed_time; 34*cada938aSHeiko Carstens /* basic and extended format: */ 359807f759SDavid Howells __u64 ssch_rsch_count; 369807f759SDavid Howells __u64 sample_count; 379807f759SDavid Howells __u64 device_connect_time; 389807f759SDavid Howells __u64 function_pending_time; 399807f759SDavid Howells __u64 device_disconnect_time; 409807f759SDavid Howells __u64 control_unit_queuing_time; 419807f759SDavid Howells __u64 device_active_only_time; 429807f759SDavid Howells /* extended format only: */ 439807f759SDavid Howells __u64 device_busy_time; 449807f759SDavid Howells __u64 initial_command_response_time; 459807f759SDavid Howells }; 469807f759SDavid Howells 479807f759SDavid Howells /* enable channel measurement */ 489807f759SDavid Howells #define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER, 32) 499807f759SDavid Howells /* enable channel measurement */ 509807f759SDavid Howells #define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER, 33) 519807f759SDavid Howells /* read channel measurement data */ 529807f759SDavid Howells #define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata) 539807f759SDavid Howells 549807f759SDavid Howells #endif /* _UAPIS390_CMB_H */ 55