GTT memory usage overflow

[sunnanyong]

Hi All,
     When the gtt memory is used up, application continues to use gtt , then the gtt will overflow,
the gtt available will be negative(cat /sys/kernel/debug/dri/1/amdgpu_gtt_mm), and more system memory is used as GTT, is it normal?
My kernel  is newest v4.18 master,  I add "cma=0 amdgpu.gttsize=24576" in kernel boot cmdline.

Please help, Thanks : )
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