linux-kernel - Re: [RFC][PATCH 4/4] arm64: dts: hikey: Add pstore support for HiKey

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Date:	Mon, 8 Aug 2016 16:20:55 -0700
From:	Kees Cook <keescook@...omium.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Guodong Xu <guodong.xu@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Wei Xu <xuwei5@...ilicon.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC][PATCH 4/4] arm64: dts: hikey: Add pstore support for HiKey

On Mon, Aug 8, 2016 at 4:03 PM, John Stultz <john.stultz@...aro.org> wrote:
> This patch reserves some memory in the DTS and sets up a
> pstore device tree node to enable pstore support on HiKey.
>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Guodong Xu <guodong.xu@...aro.org>
> Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
> Cc: Wei Xu <xuwei5@...ilicon.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> index b2683e4..9140306 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> @@ -32,6 +32,7 @@
>          *  0x05f0,1000 - 0x05f0,1fff: Reboot reason
>          *  0x06df,f000 - 0x06df,ffff: Mailbox message data
>          *  0x0740,f000 - 0x0740,ffff: MCU firmware section
> +        *  0x21f0,0000 - 0x21ff,ffff: pstore/ramoops buffer
>          *  0x3e00,0000 - 0x3fff,ffff: OP-TEE
>          */
>         memory@0 {
> @@ -40,7 +41,21 @@
>                       <0x00000000 0x05f00000 0x00000000 0x00001000>,
>                       <0x00000000 0x05f02000 0x00000000 0x00efd000>,
>                       <0x00000000 0x06e00000 0x00000000 0x0060f000>,
> -                     <0x00000000 0x07410000 0x00000000 0x36bf0000>;
> +                     <0x00000000 0x07410000 0x00000000 0x1aaf0000>,
> +                     <0x00000000 0x22000000 0x00000000 0x1c000000>;
> +       };
> +
> +       pstore: pstore@...1f00000 {
> +               no-map;
> +               reg = <0x0 0x21f00000 0x0 0x00100000>;  /* pstore buffer */
> +       };
> +
> +       ramoops {
> +               compatible = "ramoops";
> +               memory-region = <&pstore>;
> +               record-size     = <0x0 0x00020000>;
> +               console-size    = <0x0 0x00020000>;
> +               ftrace-size     = <0x0 0x00020000>;
>         };
>
>         reboot-mode-syscon@...1000 {

Heh, sorry, we changed the pstore DT format out from under you. :)

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=529182e204db083cb7bda832d1c5c6d9278ba1cb

But otherwise, sure!

-Kees

-- 
Kees Cook
Nexus Security