公开(公告)号：US12079132B2

公开(公告)日：2024-09-03

申请号：US18101806

申请日：2023-01-26

Applicant: Arm Limited

Inventor： Jamshed Jalal ,  Ashok Kumar Tummala ,  Wenxuan Zhang ,  Daniel Thomas Pinero ,  Tushar P Ringe

IPC: G06F12/00 ,  G06F12/0888

CPC classification number: G06F12/0888 ,  G06F2212/1024

Abstract: Data transfer between caching domains of a data processing system is achieved by a local coherency node (LCN) of a first caching domain receiving a read request for data associated with a second caching domain, from a requesting node of the first caching domain. The LCN requests the data from the second caching domain via a transfer agent. In response to receiving a cache line containing the data from the second caching domain, the transfer agent sends the cache line to the requesting node, bypassing the LCN and, optionally, sends a read-receipt indicating the state of the cache line to the LCN. The LCN updates a coherency state for the cache line in response to receiving the read-receipt from the transfer agent and a completion acknowledgement from the requesting node. Optionally, the transfer agent may send the cache line via the LCN when congestion is detected in a response channel of the data processing system.

公开(公告)号：US20240256460A1

公开(公告)日：2024-08-01

申请号：US18101806

申请日：2023-01-26

Applicant: Arm Limited

Inventor： Jamshed Jalal ,  Ashok Kumar Tummala ,  Wenxuan Zhang ,  Daniel Thomas Pinero ,  Tushar P Ringe

IPC: G06F12/0888

CPC classification number: G06F12/0888 ,  G06F2212/1024

Abstract: Efficient data transfer between caching domains of a data processing system is achieved by a local coherency node (LCN) of a first caching domain receiving a read request for data associated with a second caching domain, from a requesting node of the first caching domain. The LCN requests the data from the second caching domain via a transfer agent. In response to receiving a cache line containing the data from the second caching domain, the transfer agent sends the cache line to the requesting node, bypassing the LCN and, optionally, sends a read-receipt indicating the state of the cache line to the LCN. The LCN updates a coherency state for the cache line in response to receiving the read-receipt from the transfer agent and a completion acknowledgement from the requesting node. Optionally, the transfer agent may send the cache line via the LCN when congestion is detected in a response channel of the data processing system.