Debarshi Dutta 8bc36f5383 gpu: nvgpu: remove __flush_dcache_area ...

In preparation for making nvgpu more aligned to upstream kernel, the
dependency on the downstream exported _flush_dcache_area is removed.
Nvgpu instead uses dma_buf_begin_cpu_access/dma_buf_end_cpu_access to
correctly flush the dirty writes and ensure coherency for
combits_scatter_buffer.

For kernel versions below 4.19, nvgpu calls the modified
APIs provided by Nvmap. Going forward Nvmap will be maintaining
compatibility with the existing APIs.

Change-Id: I5f4e01e45e61000693182392eadf05f197517a81
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2358937
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

2020-12-15 14:13:28 -06:00

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