On Wed, Oct 30, 2019 at 06:53:41PM +0100, Christoph Hellwig wrote:
How do you even use this code? Nothing in the kernel even calls dma_set_mask for NPU devices, as we only suport vfio pass through.
You use it by calling dma_set_mask() for the *GPU* device. The purpose of pnv_npu_try_dma_set_bypass() is to then propagate the same bypass configuration to all the NPU devices associated with that GPU.
-- Reza Arbab
