Crashes on sc8280xp when using /dev/dma_heap/system

[mediouni-m]

Hello,

When allowing fastrpc to use /dev/dma_heap/system I see that the system fails quite quickly and freezes. If not allowed then everything works...

This is on https://github.com/steev/linux/tree/lenovo-x13s-linux-6.17.y with https://lore.kernel.org/all/20250704083726.1901705-1-ekansh.gupta@oss.qualcomm.com/ cherry-picked, on a ThinkPad X13s with 32GB of RAM w/ Linux booting at EL2.

[mediouni-m]

I also get crashes when trying to use multiple NPU sessions in the same process...

[ekanshibu]

Hello,

When allowing fastrpc to use /dev/dma_heap/system I see that the system fails quite quickly and freezes. If not allowed then everything works...

This is on https://github.com/steev/linux/tree/lenovo-x13s-linux-6.17.y with https://lore.kernel.org/all/20250704083726.1901705-1-ekansh.gupta@oss.qualcomm.com/ cherry-picked, on a ThinkPad X13s with 32GB of RAM w/ Linux booting at EL2.

Hi @mediouni-m,

Can you please help with the failure details for this case? The latest fastrpc lib supports fallback to fastrpc driver IOCTL in case system heap is not accessible. But with system heap access also it should not fail.

[ekanshibu]

I also get crashes when trying to use multiple NPU sessions in the same process...

How are you running multiple sessions here? Can you please help with crash details for this?

Also, I am looking for the DSP firmware files that you are using to check if the support is available here or not.