Data reading method and device based on DMA engine and data transmission system

Abstract

The invention provides a data reading method and device based on a DMA engine and a data transmission system, and the method comprises the steps: receiving a reading request command of a user side, caching the reading request command to a first memory according to a first sequence, sending the reading request command to the user side according to the first sequence, and enabling the first memory to be in one-to-one correspondence with the user side; sending the read request command to a corresponding destination storage end, recording a second sequence by adopting a second memory, the second sequence being a user end sequence corresponding to the read request command received by the destination storage end, and the second memory being in one-to-one correspondence with the destination storage end; caching the returned data to third memories according to a second sequence, enabling one destination storage end to correspond to a plurality of third memories, and enabling the third memoriescorresponding to the destination storage ends to be in one-to-one correspondence with the user ends; and transmitting return data corresponding to the read request command to the user side accordingto the first sequence. Compared with the prior art, the method has the advantages that the number of DMA engines and interfaces is reduced, and then the scheduling overhead is reduced.

Description

technical field [0001] The present application relates to the technical field of data reading, and in particular, relates to a DMA engine-based data reading method, device, computer-readable storage medium, processor, and data transmission system. Background technique [0002] The DMA engine is one of the most important data modules in the memory controller, and its performance optimization is very important. In the SSD controller, there is usually a need for multiple clients to read data from multiple storage terminals. In this case, multiple DMA read engines are generally required to participate in data reading. [0003] Coordination among individual clients also has an impact on overall DMA performance. [0004] In addition, the performance of the DMA read engine depends on the data receiving capability of the client side. [0005] The performance of the DMA read engine is directly related to the delay of returning data from the destination and the data receiving capabi...

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Problems solved by technology

[0009] The main purpose of this application is to provide a data reading method, device, computer-readable storage medium, processor, and data transmission system based on a DMA engine, so as to solve the problem of using multiple DMA engines in the prior art to achieve multi-client access. high cost due to storage

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