Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / s390 / include / asm / cmb.h
blob39ae03294794f23b852a233e724d8a1b98342c6e
1 #ifndef S390_CMB_H
2 #define S390_CMB_H
4 #include <linux/types.h>
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)
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.
30 struct 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;
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)
53 #ifdef __KERNEL__
54 struct ccw_device;
55 extern int enable_cmf(struct ccw_device *cdev);
56 extern int disable_cmf(struct ccw_device *cdev);
57 extern u64 cmf_read(struct ccw_device *cdev, int index);
58 extern int cmf_readall(struct ccw_device *cdev, struct cmbdata *data);
60 #endif /* __KERNEL__ */
61 #endif /* S390_CMB_H */