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-rw-r--r--arch/s390/include/uapi/asm/cmb.h53
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1#ifndef _UAPIS390_CMB_H
2#define _UAPIS390_CMB_H
3
4#include <linux/types.h>
5
6/**
7 * struct cmbdata - channel measurement block data for user space
8 * @size: size of the stored data
9 * @elapsed_time: time since last sampling
10 * @ssch_rsch_count: number of ssch and rsch
11 * @sample_count: number of samples
12 * @device_connect_time: time of device connect
13 * @function_pending_time: time of function pending
14 * @device_disconnect_time: time of device disconnect
15 * @control_unit_queuing_time: time of control unit queuing
16 * @device_active_only_time: time of device active only
17 * @device_busy_time: time of device busy (ext. format)
18 * @initial_command_response_time: initial command response time (ext. format)
19 *
20 * All values are stored as 64 bit for simplicity, especially
21 * in 32 bit emulation mode. All time values are normalized to
22 * nanoseconds.
23 * Currently, two formats are known, which differ by the size of
24 * this structure, i.e. the last two members are only set when
25 * the extended channel measurement facility (first shipped in
26 * z990 machines) is activated.
27 * Potentially, more fields could be added, which would result in a
28 * new ioctl number.
29 */
30struct cmbdata {
31 __u64 size;
32 __u64 elapsed_time;
33 /* basic and exended format: */
34 __u64 ssch_rsch_count;
35 __u64 sample_count;
36 __u64 device_connect_time;
37 __u64 function_pending_time;
38 __u64 device_disconnect_time;
39 __u64 control_unit_queuing_time;
40 __u64 device_active_only_time;
41 /* extended format only: */
42 __u64 device_busy_time;
43 __u64 initial_command_response_time;
44};
45
46/* enable channel measurement */
47#define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER, 32)
48/* enable channel measurement */
49#define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER, 33)
50/* read channel measurement data */
51#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata)
52
53#endif /* _UAPIS390_CMB_H */