linux-kernel - Re: [PATCH 1/2] arm: mvebu: increase atomic coherent pool size for armada 370/XP

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Date:	Thu, 25 Oct 2012 07:29:37 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Ben Dooks <ben-linux@...ff.org>,
	Ian Molton <ian.molton@...ethink.co.uk>,
	Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Jani Monoses <jani.monoses@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm: mvebu: increase atomic coherent pool size for
 armada 370/XP

Hello,

On 10/24/2012 3:49 PM, Gregory CLEMENT wrote:
> For Armada 370/XP we have the same problem that for the commit
> cb01b63, so we applied the same solution: "The default 256 KiB
> coherent pool may be too small for some of the Kirkwood devices, so
> increase it to make sure that devices will be able to allocate their
> buffers with GFP_ATOMIC flag"
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>

Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   arch/arm/mach-mvebu/armada-370-xp.c |   12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
> index 2af6ce5..cbad821 100644
> --- a/arch/arm/mach-mvebu/armada-370-xp.c
> +++ b/arch/arm/mach-mvebu/armada-370-xp.c
> @@ -17,6 +17,7 @@
>   #include <linux/of_platform.h>
>   #include <linux/io.h>
>   #include <linux/time-armada-370-xp.h>
> +#include <linux/dma-mapping.h>
>   #include <asm/mach/arch.h>
>   #include <asm/mach/map.h>
>   #include <asm/mach/time.h>
> @@ -43,6 +44,16 @@ void __init armada_370_xp_timer_and_clk_init(void)
>   	armada_370_xp_timer_init();
>   }
>
> +void __init armada_370_xp_init_early(void)
> +{
> +	/*
> +	 * Some Armada 370/XP devices allocate their coherent buffers
> +	 * from atomic context. Increase size of atomic coherent pool
> +	 * to make sure such the allocations won't fail.
> +	 */
> +	init_dma_coherent_pool_size(SZ_1M);
> +}
> +
>   struct sys_timer armada_370_xp_timer = {
>   	.init		= armada_370_xp_timer_and_clk_init,
>   };
> @@ -61,6 +72,7 @@ static const char * const armada_370_xp_dt_board_dt_compat[] = {
>   DT_MACHINE_START(ARMADA_XP_DT, "Marvell Aramada 370/XP (Device Tree)")
>   	.init_machine	= armada_370_xp_dt_init,
>   	.map_io		= armada_370_xp_map_io,
> +	.init_early	= armada_370_xp_init_early,
>   	.init_irq	= armada_370_xp_init_irq,
>   	.handle_irq     = armada_370_xp_handle_irq,
>   	.timer		= &armada_370_xp_timer,
>
Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center

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