[Xen-devel] [ARM] Handling CMA pool device nodes in Dom0

[Iurii Mykhalskyi <iurii.mykhalskyi@xxxxxxxxxxxxxxx>]

Hello!

I'm working under Renesas Gen3 H3 board with 4GB RAM (Salvator-X) support in Xen mainline.

Salvator-X has several  CMA pool nodes, for example:

1:

adsp_reserved: linux,adsp {

compatible = "shared-dma-pool";

reusable;

reg = <0x00000000 0x57000000 0x0 0x01000000>;

};

2:

linux,cma {

compatible = "shared-dma-pool";

reusable;

reg = <0x00000000 0x58000000 0x0 0x18000000>;

linux,cma-default;

};

During Dom0 allocation, we can't guarantee, that allocated memory will contain mentioned regions.

In second сase, we can actually hardcode mapped region by using separate DTS for Dom0 with changed memory regions. 

But for first one, this in not an option - this pool is used for audio DSP and its firmware relies on this addresses. 

What is the correct way to solve this situation?

Does Xen has some mechanism to handle such cases?

Thank you.

--

Iurii Mykhalskyi | Senior Software Engineer
GlobalLogic
P +38.044.492.9695x3664  M +38.096.311.5467  S mad-nemoi
www.globallogic.com

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