| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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__ |
| 55 | |
| 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 */ |