include/asm-s390/cmb.h

   1 #ifndef S390_CMB_H
   2 #define S390_CMB_H
   3 /**
   4  * struct cmbdata - channel measurement block data for user space
   5  * @size: size of the stored data
   6  * @elapsed_time: time since last sampling
   7  * @ssch_rsch_count: number of ssch and rsch
   8  * @sample_count: number of samples
   9  * @device_connect_time: time of device connect
  10  * @function_pending_time: time of function pending
  11  * @device_disconnect_time: time of device disconnect
  12  * @control_unit_queuing_time: time of control unit queuing
  13  * @device_active_only_time: time of device active only
  14  * @device_busy_time: time of device busy (ext. format)
  15  * @initial_command_response_time: initial command response time (ext. format)
  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 would result 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 /* read channel measurement data */
  48 #define BIODASDREADALLCMB       _IOWR(DASD_IOCTL_LETTER, 33, struct cmbdata)
  49
  50 #ifdef __KERNEL__
  51 struct ccw_device;
  52 extern int enable_cmf(struct ccw_device *cdev);
  53 extern int disable_cmf(struct ccw_device *cdev);
  54 extern u64 cmf_read(struct ccw_device *cdev, int index);
  55 extern int cmf_readall(struct ccw_device *cdev, struct cmbdata *data);
  56
  57 #endif /* __KERNEL__ */
  58 #endif /* S390_CMB_H */