公开(公告)号：EP3353660A1

公开(公告)日：2018-08-01

申请号：EP16770144.0

申请日：2016-09-09

申请人： Qualcomm Incorporated

发明人： LE, Hien, Minh ,  TRUONG, Thuong, Quang ,  XU, Kun ,  SUBRAMANIAM GANASAN, Jaya, Prakash ,  RAMIREZ, Cesar, Aaron

IPC分类号： G06F12/0815 ,  G06F9/52 ,  G06F12/0831

CPC分类号： G06F12/0831 ,  G06F9/524 ,  G06F12/0815 ,  G06F12/0833 ,  G06F13/16 ,  G06F13/4027 ,  G06F13/42 ,  G06F2212/1008 ,  G06F2212/621

摘要： Aspects disclosed herein include avoiding deadlocks in processor-based systems employing retry and in-order-response non-retry bus coherency protocols. In this regard, an interface bridge circuit is communicatively coupled to a first core device that implements a retry bus coherency protocol, and a second core device that implements an in-order-response non-retry bus coherency protocol. The interface bridge circuit receives a snoop command from the first core device, and forwards the snoop command to the second core device. While the snoop command is pending, the interface bridge circuit detects a potential deadlock condition between the first core device and the second core device. In response to detecting the potential deadlock condition, the interface bridge circuit is configured to send a retry response to the first core device. This enables the first core device to continue processing, thereby eliminating the potential deadlock condition.

公开(公告)号：EP3353661A1

公开(公告)日：2018-08-01

申请号：EP16766805.2

申请日：2016-09-09

申请人： Qualcomm Incorporated

发明人： XU, Kun ,  TRUONG, Thuong, Quang ,  SUBRAMANIAM GANASAN, Jaya, Prakash ,  LE, Hien, Minh ,  RAMIREZ, Cesar, Aaron

IPC分类号： G06F12/0831

CPC分类号： G06F12/0815 ,  G06F12/0831 ,  G06F2212/1024 ,  G06F2212/1028 ,  G06F2212/621 ,  Y02D10/13

摘要： Maintaining cache coherency using conditional intervention among multiple master devices is disclosed. In one aspect, a conditional intervention circuit is configured to receive intervention responses from multiple snooping master devices. To select a snooping master device to provide intervention data, the conditional intervention circuit determines how many snooping master devices have a cache line granule size the same as or larger than a requesting master device. If one snooping master device has a same or larger cache line granule size, that snooping master device is selected. If more than one snooping master device has a same or larger cache line granule size, a snooping master device is selected based on an alternate criteria. The intervention responses provided by the unselected snooping master devices are canceled by the conditional intervention circuit, and intervention data from the selected snooping master device is provided to the requesting master device.