gpu/cuda: introduce CUDA driver

From: Elena Agostini <[email protected]>

This is the CUDA implementation of the gpudev library. Funcitonalities implemented through CUDA Driver API are:

- Device probe and remove
- Manage device memory allocations
- Register/unregister external CPU memory in the device memory area

Changelog:
- CUDA driver implementation of the GPU write memory barrier
- Fixed styling reported by checkpatch
- CUDA driver shared library libcuda.so is not required at build time
- CUDA driver shared library libcuda.so is loaded at runtime
- CUDA driver headers are required at build time
- Documentation updated
- NVIDIA GPU T4 support added

Elena Agostini (1):
gpu/cuda: introduce CUDA driver

 doc/guides/gpus/cuda.rst               |  152 ++++
 doc/guides/gpus/index.rst              |    1 +
 doc/guides/rel_notes/release_21_11.rst |    2 +
 drivers/gpu/cuda/cuda.c                | 1150 ++++++++++++++++++++++++
 drivers/gpu/cuda/meson.build           |   18 +
 drivers/gpu/cuda/version.map           |    3 +
 drivers/gpu/meson.build                |    2 +-
 7 files changed, 1327 insertions(+), 1 deletion(-)
 create mode 100644 doc/guides/gpus/cuda.rst
 create mode 100644 drivers/gpu/cuda/cuda.c
 create mode 100644 drivers/gpu/cuda/meson.build
 create mode 100644 drivers/gpu/cuda/version.map

2.17.1