| /* 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 extended 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 */ |
