linux-kernel - Re: [PATCH 4.4 08/40] ARM: dts: mvebu: pl310-cache disable double-linefill

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Message-ID: <b3b07fb4-fe35-7523-1d88-2bdb747a66f4@dd-wrt.com>
Date:   Wed, 8 Nov 2017 00:06:48 +0100
From:   Sebastian Gottschall <s.gottschall@...wrt.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Yan Markman <ymarkman@...vell.com>,
        Igal Liberman <igall@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH 4.4 08/40] ARM: dts: mvebu: pl310-cache disable
 double-linefill

what about 4.9?

Am 06.11.2017 um 10:44 schrieb Greg Kroah-Hartman:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Yan Markman <ymarkman@...vell.com>
>
> commit cda80a82ac3e89309706c027ada6ab232be1d640 upstream.
>
> Under heavy system stress mvebu SoC using Cortex A9 sporadically
> encountered instability issues.
>
> The "double linefill" feature of L2 cache was identified as causing
> dependency between read and write which lead to the deadlock.
>
> Especially, it was the cause of deadlock seen under heavy PCIe traffic,
> as this dependency violates PCIE overtaking rule.
>
> Fixes: c8f5a878e554 ("ARM: mvebu: use DT properties to fine-tune the L2 configuration")
> Signed-off-by: Yan Markman <ymarkman@...vell.com>
> Signed-off-by: Igal Liberman <igall@...vell.com>
> Signed-off-by: Nadav Haklai <nadavh@...vell.com>
> [gregory.clement@...e-electrons.com: reformulate commit log, add Armada
> 375 and add Fixes tag]
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
> ---
>   arch/arm/boot/dts/armada-375.dtsi |    4 ++--
>   arch/arm/boot/dts/armada-38x.dtsi |    4 ++--
>   arch/arm/boot/dts/armada-39x.dtsi |    4 ++--
>   3 files changed, 6 insertions(+), 6 deletions(-)
>
> --- a/arch/arm/boot/dts/armada-375.dtsi
> +++ b/arch/arm/boot/dts/armada-375.dtsi
> @@ -176,9 +176,9 @@
>   				reg = <0x8000 0x1000>;
>   				cache-unified;
>   				cache-level = <2>;
> -				arm,double-linefill-incr = <1>;
> +				arm,double-linefill-incr = <0>;
>   				arm,double-linefill-wrap = <0>;
> -				arm,double-linefill = <1>;
> +				arm,double-linefill = <0>;
>   				prefetch-data = <1>;
>   			};
>   
> --- a/arch/arm/boot/dts/armada-38x.dtsi
> +++ b/arch/arm/boot/dts/armada-38x.dtsi
> @@ -143,9 +143,9 @@
>   				reg = <0x8000 0x1000>;
>   				cache-unified;
>   				cache-level = <2>;
> -				arm,double-linefill-incr = <1>;
> +				arm,double-linefill-incr = <0>;
>   				arm,double-linefill-wrap = <0>;
> -				arm,double-linefill = <1>;
> +				arm,double-linefill = <0>;
>   				prefetch-data = <1>;
>   			};
>   
> --- a/arch/arm/boot/dts/armada-39x.dtsi
> +++ b/arch/arm/boot/dts/armada-39x.dtsi
> @@ -104,9 +104,9 @@
>   				reg = <0x8000 0x1000>;
>   				cache-unified;
>   				cache-level = <2>;
> -				arm,double-linefill-incr = <1>;
> +				arm,double-linefill-incr = <0>;
>   				arm,double-linefill-wrap = <0>;
> -				arm,double-linefill = <1>;
> +				arm,double-linefill = <0>;
>   				prefetch-data = <1>;
>   			};
>   
>
>
>

-- 
Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

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