Nicolin Chen b0d6964325 gpu: nvgpu: Add non-contiguous memory allocation ...

The latest GPU uses nvlink and its own MMU to access memory,
instead of SMMU like others. So it doesn't go through IOMMU
framework to allocate physically non-contiguous memory. The
DMA API had a pair of downstream functions to allocate the
memory for this situation, but it is removed since it's not
likely acceptable for upstream kernel.

In order not to hack the dma-direct ops that by its meaning
is supposed to provide contiguous memory, this patch adds a
pair of memory-allocation functions inside the gpu driver,
since nvgpu is the only user.

This pair of functions are only used when GPU driver doesn't
go through either dma-direct (FORCE_CONTIGUOUS) or iommu. It
also requires GPU driver to map the non-contiguous pages.

Bug 200444660

Change-Id: I26678a3f8d63bba340872beeecbb7b0e1e7a35fa
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2029680
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-03-14 03:38:28 -07:00

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