Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
SCGBK
Control Block Contents
SCGBK DSECT
Cross Reference (Contains links to field and bit definitions)
SCGBK Prolog
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 - absolute 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 NOTES : 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. 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
SCGBK DSECT
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 * (7) 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
*** SCGBK - 64 byte Subchannel Measurement Block * * +---------------------------+---------------------------+ * 0 | SCGSSCH | SCGCOUNT | * +---------------------------+---------------------------+ * 8 | SCGCNTIM | SCGFPTIM | * +---------------------------+---------------------------+ * 10 | SCGDDTIM | SCGCQTIM | * +---------------------------+---------------------------+ * 18 | SCGDATIM | SCGDBTIM | * +---------------------------+---------------------------+ * 20 | SCGIRTIM |///////////////////////////| * +---------------------------+///////////////////////////| * 28 |///////////////////////////////////////////////////////| * =///////////////////////////////////////////////////////= * |///////////////////////////////////////////////////////| * +-------------------------------------------------------+ * 40 * *** SCGBK - 64 byte Subchannel Measurement Block
SCGBK Cross Reference
Symbol Dspl Value -------------- ---- ----- SCGCNTIM 0008 SCGCOUNT 0004 SCGCQTIM 0014 SCGDATIM 0018 SCGDBTIM 001C SCGDDTIM 0010 SCGFPTIM 000C SCGIRTIM 0020 SCGSIZE 0024 00000008 SCGSIZEB 0024 00000040 SCGSSCH 0000
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