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1da177e4 LT |
1 | #ifndef S390_CMB_H |
2 | #define S390_CMB_H | |
0680ba01 HC |
3 | |
4 | #include <linux/types.h> | |
5 | ||
1da177e4 | 6 | /** |
c0208716 CH |
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) | |
1da177e4 | 19 | * |
c0208716 | 20 | * All values are stored as 64 bit for simplicity, especially |
1da177e4 LT |
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. | |
c0208716 | 27 | * Potentially, more fields could be added, which would result in a |
1da177e4 | 28 | * new ioctl number. |
c0208716 | 29 | */ |
1da177e4 LT |
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; | |
44 | }; | |
45 | ||
46 | /* enable channel measurement */ | |
fc5019c5 | 47 | #define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER, 32) |
1da177e4 | 48 | /* enable channel measurement */ |
fc5019c5 | 49 | #define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER, 33) |
1da177e4 | 50 | /* read channel measurement data */ |
fc5019c5 | 51 | #define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata) |
1da177e4 LT |
52 | |
53 | #ifdef __KERNEL__ | |
4beb3709 | 54 | struct ccw_device; |
1da177e4 | 55 | extern int enable_cmf(struct ccw_device *cdev); |
1da177e4 | 56 | extern int disable_cmf(struct ccw_device *cdev); |
1da177e4 | 57 | extern u64 cmf_read(struct ccw_device *cdev, int index); |
fc5019c5 | 58 | extern int cmf_readall(struct ccw_device *cdev, struct cmbdata *data); |
1da177e4 LT |
59 | |
60 | #endif /* __KERNEL__ */ | |
61 | #endif /* S390_CMB_H */ |