[PATCH 4/4] mips: dma: Add cma support

[Michal Nazarewicz]

On Wed, Jul 16 2014, Zubair Lutfullah Kakakhel <Zubair.Kakakhel at imgtec.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 at imgtec.com>

Acked-by: Michal Nazarewicz <mina86 at mina86.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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