Method and device for monitoring cross-border of CMA memory of in-vehicle infotainment system and storage medium

Abstract

The invention discloses a method for monitoring boundary crossing of a CMA (Common Multiple Access) memory of a vehicle-mounted infotainment system, which comprises the following steps: 1) after the system is powered on, a module begins to initialize and applies for the CMA memory; (2) when the CMA memory is applied, more memories are applied before and after the applied memory area; 3) writing a preset datum in the memory area with multiple applications, and recording which controller applies for the memory area; 4) starting one thread to monitor whether the memory of multiple applications before and after is rewritten or not; and 5) if the memory of the previous and later applications is rewritten, judging the memory area of the controller, notifying the corresponding controller to perform reset operation, and repairing the memory cross-border problem. The invention further discloses a device for monitoring the CMA memory cross-border of the vehicle-mounted infotainment system. According to the method, the CMA memory border crossing condition of the vehicle-mounted infotainment system can be monitored in time so as to be repaired in time, and the system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to a method, a device and a storage medium for monitoring the CMA memory out-of-bounds of a vehicle-machine system. Background technique [0002] The car system generally adopts Linux or Android system, and most of the various controllers in the system involve the application, use and release of memory. The existing car-machine system generally integrates functions such as reversing image and screen projection. The corresponding peripheral module camera, display screen, video encoding and decoding module, GPU, etc. need to apply for CMA memory during power-on initialization, which is used for video data storage. transmission, processing, etc. GPUs, cameras, hardware video decoders, encoders and other equipment in the car require large continuous memory buffers when in use. CMA technology is used to allocate continuous memory space for data transmission, and data is mo...

AI Technical Summary

Problems solved by technology

The GPU, camera, hardware video decoder, encoder and other devices in the car all need a large continuous memory buffer when they are in use. CMA technology is used to allocate continuous memory space for data transmission, and the data is moved during DMA transmission. To DMA memory, many DMA controllers cannot return and occupy memory

Because it is impossible to know the occupation of CMA memory, it is impossible to effectively compare whether there is a memory out of bounds

In this process, problems such as memory leaks and memory out-of-bounds are prone to occur.

If the memory exceeds the bounds, it will easily lead to data loss, causing the entire system to malfunction, such as the camera displaying a blurry screen, and may even cause the system to restart, seriously affecting the normal operation of the system

[0003] When a memory problem occurs in the system, the phenomenon is often uncertain, and the conditions and time of occurrence are also uncertain, so it is difficult to locate where the memory problem occurs

Existing code detection tools can only detect some obvious memory leaks and memory out-of-bounds problems. For complex functional codes, traditional code detection tools cannot effectively check

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