Coherent proxy for attached processor

A coherent attached processor proxy (CAPP) of a primary coherent system receives a memory access request from an attached processor (AP) and an expected coherence state of a target address of the memory access request with respect to a cache memory of the AP. In response, the CAPP determines a coher...

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Bibliographic Details
Main Authors STUECHELI JEFF A, STARKE WILLIAM J, SIEGEL MICHAEL S, BLANER BARTHOLOMEW, MARINO CHARLES
Format Patent
LanguageEnglish
Published 30.06.2015
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A coherent attached processor proxy (CAPP) of a primary coherent system receives a memory access request from an attached processor (AP) and an expected coherence state of a target address of the memory access request with respect to a cache memory of the AP. In response, the CAPP determines a coherence state of the target address and whether or not the expected state matches the determined coherence state. In response to determining that the expected state matches the determined coherence state, the CAPP issues a memory access request corresponding to that received from the AP on a system fabric of the primary coherent system. In response to determining that the expected state does not match the coherence state determined by the CAPP, the CAPP transmits a failure message to the AP without issuing on the system fabric a memory access request corresponding to that received from the AP.
Bibliography:Application Number: US201213686489