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

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Date: Tue, 9 Apr 2024 14:14:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Pascal FONTAIN <Pascal.FONTAIN@...hmann.info>
Cc: linux-kernel@...r.kernel.org, Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	afd@...com, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v3 2/2] misc: sram: Add DMA-BUF Heap exporting of SRAM
 areas

On Tue, Apr 09, 2024 at 02:06:05PM +0200, Pascal FONTAIN wrote:
> From: Andrew Davis <afd@...com>
> 
> 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@...com>
> Tested-by: Pascal Fontain <pascal.fontain@...hmann.info>

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