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  *
   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 /* read channel measurement data */
  48 #define BIODASDREADALLCMB       _IOWR(DASD_IOCTL_LETTER,33,struct cmbdata)
  49
  50 #ifdef __KERNEL__
  51 struct ccw_device;
  52 /**
  53  * enable_cmf() - switch on the channel measurement for a specific device
  54  *  @cdev:      The ccw device to be enabled
  55  *  returns 0 for success or a negative error value.
  56  *
  57  *  Context:
  58  *    non-atomic
  59  **/
  60 extern int enable_cmf(struct ccw_device *cdev);
  61
  62 /**
  63  * disable_cmf() - switch off the channel measurement for a specific device
  64  *  @cdev:      The ccw device to be disabled
  65  *  returns 0 for success or a negative error value.
  66  *
  67  *  Context:
  68  *    non-atomic
  69  **/
  70 extern int disable_cmf(struct ccw_device *cdev);
  71
  72 /**
  73  * cmf_read() - read one value from the current channel measurement block
  74  * @cmf:        the channel to be read
  75  * @index:      the name of the value that is read
  76  *
  77  *  Context:
  78  *    any
  79  **/
  80
  81 extern u64 cmf_read(struct ccw_device *cdev, int index);
  82 /**
  83  * cmf_readall() - read one value from the current channel measurement block
  84  * @cmf:        the channel to be read
  85  * @data:       a pointer to a data block that will be filled
  86  *
  87  *  Context:
  88  *    any
  89  **/
  90 extern int cmf_readall(struct ccw_device *cdev, struct cmbdata*data);
  91
  92 #endif /* __KERNEL__ */
  93 #endif /* S390_CMB_H */