arch/s390/include/uapi/asm/cmb.h

   1 #ifndef _UAPIS390_CMB_H
   2 #define _UAPIS390_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 #endif /* _UAPIS390_CMB_H */