linux-kernel - Re: [PATCH 4/4] mips: dma: Add cma support

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Message-ID: <xa1t7g3db6mu.fsf@mina86.com>
Date:	Wed, 16 Jul 2014 18:39:05 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
	ralf@...ux-mips.org, catalin.marinas@....com, will.deacon@....com,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, arnd@...db.de,
	gregkh@...uxfoundation.org, m.szyprowski@...sung.com
Cc:	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 4/4] mips: dma: Add cma support

On Wed, Jul 16 2014, Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com> 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 <Zubair.Kakakhel@...tec.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  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(-)
>

-- 
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.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
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