[PATCH 11/20] dma: support marking SRAM for coherent DMA use

[Sascha Hauer]

On Mon, May 31, 2021 at 09:38:12AM +0200, Ahmad Fatoum wrote:
> The RISC-V architecture allows overriding the dma_alloc_coherent and
> dma_free_coherent. Allow this to be controlled by device tree.
> 
> Cache-coherent SoCs won't need this, but incoherent ones that have
> uncached regions can register them here.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  common/Kconfig              |   4 ++
>  common/Makefile             |   3 +-
>  drivers/dma/Kconfig         |   6 ++
>  drivers/dma/Makefile        |   1 +
>  drivers/dma/coherent-pool.c | 120 ++++++++++++++++++++++++++++++++++++
>  5 files changed, 133 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/dma/coherent-pool.c
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index ce349d4ebbf6..dbbcbb946fff 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -303,6 +303,9 @@ config EXPERIMENTAL
>  	bool
>  	prompt "Prompt for experimental code"
>  
> +config TLSF
> +	bool
> +
>  choice
>  	prompt "malloc implementation"
>  
> @@ -311,6 +314,7 @@ config MALLOC_DLMALLOC
>  
>  config MALLOC_TLSF
>  	bool "tlsf"
> +	select TLSF
>  
>  config MALLOC_DUMMY
>  	bool "dummy malloc"
> diff --git a/common/Makefile b/common/Makefile
> index 382a4f661f67..0777d2030c99 100644
> --- a/common/Makefile
> +++ b/common/Makefile
> @@ -40,7 +40,8 @@ obj-$(CONFIG_GLOBALVAR)		+= globalvar.o
>  obj-$(CONFIG_GREGORIAN_CALENDER) += date.o
>  obj-$(CONFIG_KALLSYMS)		+= kallsyms.o
>  obj-$(CONFIG_MALLOC_DLMALLOC)	+= dlmalloc.o
> -obj-$(CONFIG_MALLOC_TLSF)	+= tlsf_malloc.o tlsf.o calloc.o
> +obj-$(CONFIG_TLSF)		+= tlsf.o
> +obj-$(CONFIG_MALLOC_TLSF)	+= tlsf_malloc.o calloc.o
>  KASAN_SANITIZE_tlsf.o := n
>  obj-$(CONFIG_MALLOC_DUMMY)	+= dummy_malloc.o calloc.o
>  obj-$(CONFIG_MEMINFO)		+= meminfo.o
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index c75fc8b9811f..6bc915585fbe 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -1,5 +1,11 @@
>  menu "DMA support"
>  
> +config DMA_COHERENT_POOLS
> +	bool
> +	depends on RISCV
> +	select TLSF
> +	imply SRAM

This symbol is invisible and selected when needed. We shouldn't need
this "depends on RISCV"

Sascha

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |