[PATCH v4 1/2] gpudev: expose GPU memory to CPU

[Wang, Haiyue]

> -----Original Message-----
> From: eagostini at nvidia.com <eagostini at nvidia.com>
> Sent: Thursday, January 27, 2022 11:47
> To: dev at dpdk.org
> Cc: Elena Agostini <eagostini at nvidia.com>
> Subject: [PATCH v4 1/2] gpudev: expose GPU memory to CPU
> 
> From: Elena Agostini <eagostini at nvidia.com>
> 
> Enable the possibility to expose a GPU memory area and make it
> accessible from the CPU.
> 
> GPU memory has to be allocated via rte_gpu_mem_alloc().
> 
> This patch allows the gpudev library to map (and unmap),
> through the GPU driver, a chunk of GPU memory and to return
> a memory pointer usable by the CPU to access the GPU memory area.
> 
> Signed-off-by: Elena Agostini <eagostini at nvidia.com>
> ---
>  doc/guides/prog_guide/gpudev.rst |  9 +++++
>  drivers/gpu/cuda/cuda.c          |  2 ++
>  lib/gpudev/gpudev.c              | 61 ++++++++++++++++++++++++++++++++
>  lib/gpudev/gpudev_driver.h       |  6 ++++
>  lib/gpudev/rte_gpudev.h          | 49 +++++++++++++++++++++++++
>  lib/gpudev/version.map           |  2 ++
>  6 files changed, 129 insertions(+)
> 


> +__rte_experimental
> +void *rte_gpu_mem_cpu_map(int16_t dev_id, size_t size, void *ptr);

How about add some direction words like "to/from" to make it straightforward ?

For this: rte_gpu_mem_map_to_cpu ?

> +__rte_experimental
> +int rte_gpu_mem_cpu_unmap(int16_t dev_id, void *ptr);
> +

And rte_gpu_mem_unmap_to_cpu ?

>  };
> --
> 2.17.1