Hi Guys,
I am a newbee of gfx development. Recently, I am researching amdgpu open source
driver, and encounter a problem, but do not find the answer.
We know the user maybe map a gem backing buffer for reading/writing and hold
the mapping for a long term. while, kernel driver will also moves the user
mapped bo to other memory region. vram ->gtt, gtt->vram, even it may be
swaped out under OOM case.
So, my question is how driver prevents kernel ttm from moving the user mapped
bo while user is accessing it?
Thanks for your attention!
Lizhi.
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