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Prolog 
Control Block Contents 
   SCGBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  SCGBK Prolog Top of page
 
 NAME       : HCPSCGBK
 DESCRIPTION: 64 byte Subchannel Measurement Block
 DSECT      : SCGBK
 FUNCTION   : The measurement block is an architectually defined
              64 byte area that contains the accumulated values
              of the measured parameters for each subchannel.
 LOCATED BY : RDEVMBLK field of RDEVBK - logical address of
              measurement block
 CREATED BY : HCPCHMGS when subchannel measuring is turned on for a device
 DELETED BY : HCPCHMRS when subchannel measuring is turned off for a device
 COMPATIBILITY AND MIGRATION CONCERNS : HCPSCGBK describes the 64 byte subchannel measurement block.
              HCPSCMBK describes the 32 byte subchannel measurement block.
              When changing this control block, check if HCPSCMBK also
              requires changes.
 RELOCATION CONSIDERATIONS : None
 NOTES      : ABNORMAL coded because the block is updated by
              hardware asynchronously.  The PL/X compiler may not
              make any assumptions during optimization about the
              data contained in this block.
 
 
  SCGBK Control Block Content Top of page
 

 SCGBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SCGBK 64 byte Subchannel Measurement Block 0000 0 Signed 4 SCGSSCH Cyclic Count of SSCH and RSCH 0004 4 Signed 4 SCGCOUNT Sample Count 0008 8 Signed 4 SCGCNTIM Device-Connect Time 000C 12 Signed 4 SCGFPTIM Function-Pending Time 0010 16 Signed 4 SCGDDTIM Device-Disconnect Time 0014 20 Signed 4 SCGCQTIM Control-Unit-Queuing Time 0018 24 Signed 4 SCGDATIM Device-Active-Only Time 001C 28 Signed 4 SCGDBTIM Device-Busy Time 0020 32 Signed 4 SCGIRTIM Initial-Command-Response Time 0024 36 Signed 4 SCGIDTIM Interrupt-Delay-Time 0028 40 Signed 4 SCGPDTIM I/O-Priority-Delay-Time 002C 44 Signed 4 * (5) Reserved for future h/w use 00000040 SCGSIZEB (*-SCGBK) Length of SCGBK in bytes 00000008 SCGSIZE (*-SCGBK+7)/8 Length of SCGBK in double words
 
 
  SCGBK Storage Layout Top of page
 
          
*** SCGBK - 64 byte Subchannel Measurement Block
*
*     +---------------------------+---------------------------+
*   0 |         SCGSSCH           |         SCGCOUNT          |
*     +---------------------------+---------------------------+
*   8 |         SCGCNTIM          |         SCGFPTIM          |
*     +---------------------------+---------------------------+
*  10 |         SCGDDTIM          |         SCGCQTIM          |
*     +---------------------------+---------------------------+
*  18 |         SCGDATIM          |         SCGDBTIM          |
*     +---------------------------+---------------------------+
*  20 |         SCGIRTIM          |         SCGIDTIM          |
*     +---------------------------+---------------------------+
*  28 |         SCGPDTIM          |///////////////////////////|
*     +---------------------------+///////////////////////////|
*     |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  40
*
*** SCGBK - 64 byte Subchannel Measurement Block
 
 
  SCGBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
SCGCNTIM       0008
SCGCOUNT       0004
SCGCQTIM       0014
SCGDATIM       0018
SCGDBTIM       001C
SCGDDTIM       0010
SCGFPTIM       000C
SCGIDTIM       0024
SCGIRTIM       0020
SCGPDTIM       0028
SCGSIZE        002C 00000008
SCGSIZEB       002C 00000040
SCGSSCH        0000
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:30:14 EDT.
Copyright IBM Corporation, 1990, 2020