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Date:	Wed, 16 Jul 2014 18:39:05 +0200
From:	Michal Nazarewicz <>
To:	Zubair Lutfullah Kakakhel <>,,,,,,,,,
Subject: Re: [PATCH 4/4] mips: dma: Add cma support

On Wed, Jul 16 2014, Zubair Lutfullah Kakakhel <> wrote:
> Adds cma support to the mips architecture.
> cma uses memblock. However, mips uses bootmem.

Does cma_early_percent_memory work correctly then?

> bootmem is informed about any regions reserved by memblock

Alternatively maybe it would make sense to create a new definition of
dma_contiguous_reserve_area that uses bootmem and choose it based on
some CONFIG_CMA_USE_BOOTMEM which would be selected by MIPS.

> dma api is modified to use cma reserved memory regions when available
> Tested using cma_test. cma_test is a simple driver that assigns blocks
> of memory from cma reserved sections.
> Signed-off-by: Zubair Lutfullah Kakakhel <>

Acked-by: Michal Nazarewicz <>

> ---
>  arch/mips/Kconfig            |  1 +
>  arch/mips/include/asm/Kbuild |  1 +
>  arch/mips/kernel/setup.c     |  9 +++++++++
>  arch/mips/mm/dma-default.c   | 37 +++++++++++++++++++++++++------------
>  4 files changed, 36 insertions(+), 12 deletions(-)

Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<>--<>--ooO--(_)--Ooo--
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