Re: [PATCH v3 2/2] misc: sram: Add DMA-BUF Heap exporting of SRAM areas

[Greg Kroah-Hartman]

On Tue, Apr 09, 2024 at 02:06:05PM +0200, Pascal FONTAIN wrote:
> From: Andrew Davis <afd@xxxxxx>
> 
> This new export type exposes to userspace the SRAM area as a DMA-BUF
> Heap,
> this allows for allocations of DMA-BUFs that can be consumed by various
> DMA-BUF supporting devices.
> 
> Signed-off-by: Andrew Davis <afd@xxxxxx>
> Tested-by: Pascal Fontain <pascal.fontain@xxxxxxxxxxxxx>

When sending on a patch from someone else, you too must sign off on it
as per our documenation.  Please read it and understand what you are
agreeing to when you do that for a new version please.

> ---
>  drivers/misc/Kconfig         |   7 +
>  drivers/misc/Makefile        |   1 +
>  drivers/misc/sram-dma-heap.c | 246 +++++++++++++++++++++++++++++++++++
>  drivers/misc/sram.c          |   6 +
>  drivers/misc/sram.h          |  16 +++
>  5 files changed, 276 insertions(+)
>  create mode 100644 drivers/misc/sram-dma-heap.c
> 
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 9e4ad4d61f06..e6674e913168 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -448,6 +448,13 @@ config SRAM
>  config SRAM_EXEC
>  	bool
>  
> +config SRAM_DMA_HEAP
> +	bool "Export on-chip SRAM pools using DMA-Heaps"
> +	depends on DMABUF_HEAPS && SRAM
> +	help
> +	  This driver allows the export of on-chip SRAM marked as both pool
> +	  and exportable to userspace using the DMA-Heaps interface.

What will use this in userspace?

thanks,

greg k-h