Linux/TDA2HG: How to get physical address from GPU

user4484759

Part Number: TDA2HG

Tool/software: Linux

Hi,

I want get the GPU render data and pass it to another process which name A. Then A process write GPU render data to a file.

Because A process and GPU render process is different process. So I have to pass the physical address between them to avoid data copy.

Therefore, I want to know how to get physical address from GPU.

Is there any method can get it?

Best Regards.

Chen Junli

over 8 years ago

0 Yordan Kamenov over 8 years ago

TI__Mastermind 42515 points

Hi,

Which SDK you use?

Regards,
Yordan

0 user4484759 over 8 years ago in reply to Yordan Kamenov

Intellectual 450 points

Hi yordan,
I use GLSDK 7.04.00.03

Best Regards.
Chen Junli

0 Yordan Kamenov over 8 years ago in reply to user4484759

TI__Mastermind 42515 points

Hi,

I have forwarded your question to an expert to help.

Regards,
Yordan

0 user4484759 over 8 years ago in reply to Yordan Kamenov

Intellectual 450 points

Hi Yordan,

How about this issue?

Regards,

Chen Junli

0 Anand Balagopalakrishnan over 8 years ago in reply to user4484759

TI__Expert 5130 points

Hi,

What you are attempting is not recommended. Passing around physical addresses poses security risks. We will also not support this as it does not align with Linux kernel programming methods.

The best option to achieve this is to use DMABUF. On Processor SDK Linux Auto 3.02 and VisionSDK 3.00, we have added support for consuming DMABUF based buffers to create GBM surfaces / pixmaps. The DMABUF FDs can be passed between processes.

I would recommend the above option for your use case.

Regards,
Anand

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Linux/TDA2HG: How to get physical address from GPU