1 #ifndef S390_CMB_H 2 #define S390_CMB_H 3 4 #include <linux/types.h> 5 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) 19 * 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. 29 */ 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 */ 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) 52 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); 59 60 #endif /* __KERNEL__ */ 61 #endif /* S390_CMB_H */ 62