Accelerated recovery for snooped addresses in a coherent attached processor proxy
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United States of America Patent
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Feb 2, 2016
Grant Date -
Jul 17, 2014
app pub date -
Sep 25, 2013
filing date -
Jan 11, 2013
priority date (Note) -
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Abstract
A coherent attached processor proxy (CAPP) that participates in coherence communication in a primary coherent system on behalf of an external attached processor maintains, in each of a plurality of entries of a CAPP directory, information regarding a respective associated cache line of data from the primary coherent system cached by the attached processor. In response to initiation of recovery operations, the CAPP transmits, in a generally sequential order with respect to the CAPP directory, multiple memory access requests indicating an error for addresses indicated by the plurality of entries. In response to a snooped memory access request that targets a particular address hitting in the CAPP directory during the transmitting, the CAPP performs a coherence recovery operation for the particular address prior to a time indicated by the generally sequential order.
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