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1da177e4 LT |
1 | #ifndef S390_CMB_H |
2 | #define S390_CMB_H | |
3 | /** | |
4 | * struct cmbdata -- channel measurement block data for user space | |
5 | * | |
6 | * @size: size of the stored data | |
7 | * @ssch_rsch_count: XXX | |
8 | * @sample_count: | |
9 | * @device_connect_time: | |
10 | * @function_pending_time: | |
11 | * @device_disconnect_time: | |
12 | * @control_unit_queuing_time: | |
13 | * @device_active_only_time: | |
14 | * @device_busy_time: | |
15 | * @initial_command_response_time: | |
16 | * | |
17 | * all values are stored as 64 bit for simplicity, especially | |
18 | * in 32 bit emulation mode. All time values are normalized to | |
19 | * nanoseconds. | |
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 results in a | |
25 | * new ioctl number. | |
26 | **/ | |
27 | struct cmbdata { | |
28 | __u64 size; | |
29 | __u64 elapsed_time; | |
30 | /* basic and exended format: */ | |
31 | __u64 ssch_rsch_count; | |
32 | __u64 sample_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; | |
41 | }; | |
42 | ||
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 | /* reset channel measurement block */ | |
48 | #define BIODASDRESETCMB _IO(DASD_IOCTL_LETTER,34) | |
49 | /* read channel measurement data */ | |
50 | #define BIODASDREADCMB _IOWR(DASD_IOCTL_LETTER,32,u64) | |
51 | /* read channel measurement data */ | |
52 | #define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER,33,struct cmbdata) | |
53 | ||
54 | #ifdef __KERNEL__ | |
4beb3709 | 55 | struct ccw_device; |
1da177e4 LT |
56 | /** |
57 | * enable_cmf() - switch on the channel measurement for a specific device | |
58 | * @cdev: The ccw device to be enabled | |
59 | * returns 0 for success or a negative error value. | |
60 | * | |
61 | * Context: | |
62 | * non-atomic | |
63 | **/ | |
64 | extern int enable_cmf(struct ccw_device *cdev); | |
65 | ||
66 | /** | |
67 | * disable_cmf() - switch off the channel measurement for a specific device | |
68 | * @cdev: The ccw device to be disabled | |
69 | * returns 0 for success or a negative error value. | |
70 | * | |
71 | * Context: | |
72 | * non-atomic | |
73 | **/ | |
74 | extern int disable_cmf(struct ccw_device *cdev); | |
75 | ||
76 | /** | |
77 | * cmf_read() - read one value from the current channel measurement block | |
78 | * @cmf: the channel to be read | |
79 | * @index: the name of the value that is read | |
80 | * | |
81 | * Context: | |
82 | * any | |
83 | **/ | |
84 | ||
85 | extern u64 cmf_read(struct ccw_device *cdev, int index); | |
86 | /** | |
87 | * cmf_readall() - read one value from the current channel measurement block | |
88 | * @cmf: the channel to be read | |
89 | * @data: a pointer to a data block that will be filled | |
90 | * | |
91 | * Context: | |
92 | * any | |
93 | **/ | |
94 | extern int cmf_readall(struct ccw_device *cdev, struct cmbdata*data); | |
95 | extern void cmf_reset(struct ccw_device *cdev); | |
96 | ||
97 | #endif /* __KERNEL__ */ | |
98 | #endif /* S390_CMB_H */ |