4 * struct cmbdata - channel measurement block data for user space
5 * @size: size of the stored data
6 * @elapsed_time: time since last sampling
7 * @ssch_rsch_count: number of ssch and rsch
8 * @sample_count: number of samples
9 * @device_connect_time: time of device connect
10 * @function_pending_time: time of function pending
11 * @device_disconnect_time: time of device disconnect
12 * @control_unit_queuing_time: time of control unit queuing
13 * @device_active_only_time: time of device active only
14 * @device_busy_time: time of device busy (ext. format)
15 * @initial_command_response_time: initial command response time (ext. format)
17 * All values are stored as 64 bit for simplicity, especially
18 * in 32 bit emulation mode. All time values are normalized to
20 * Currently, two formats are known, which differ by the size of
21 * this structure, i.e. the last two members are only set when
22 * the extended channel measurement facility (first shipped in
23 * z990 machines) is activated.
24 * Potentially, more fields could be added, which would result in a
30 /* basic and exended format: */
31 __u64 ssch_rsch_count;
33 __u64 device_connect_time;
34 __u64 function_pending_time;
35 __u64 device_disconnect_time;
36 __u64 control_unit_queuing_time;
37 __u64 device_active_only_time;
38 /* extended format only: */
39 __u64 device_busy_time;
40 __u64 initial_command_response_time;
43 /* enable channel measurement */
44 #define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER, 32)
45 /* enable channel measurement */
46 #define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER, 33)
47 /* read channel measurement data */
48 #define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata)
52 extern int enable_cmf(struct ccw_device *cdev);
53 extern int disable_cmf(struct ccw_device *cdev);
54 extern u64 cmf_read(struct ccw_device *cdev, int index);
55 extern int cmf_readall(struct ccw_device *cdev, struct cmbdata *data);
57 #endif /* __KERNEL__ */
58 #endif /* S390_CMB_H */