linux-kernel - Re: [RFC][PATCH] misc: Introduce reboot

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 9 Dec 2015 17:32:02 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinay Simha BN <simhavcs@...il.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Andy Gross <agross@...eaurora.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [RFC][PATCH] misc: Introduce reboot_reason driver

On Tue, Dec 8, 2015 at 2:07 PM, Bjorn Andersson
<bjorn.andersson@...ymobile.com> wrote:
> On Tue 08 Dec 13:29 PST 2015, John Stultz wrote:
>> diff --git a/arch/arm/boot/dts/qcom-apq8064-nexus7-flo.dts b/arch/arm/boot/dts/qcom-apq8064-nexus7-flo.dts
>> index 5183d18..ee5dcb7 100644
>> --- a/arch/arm/boot/dts/qcom-apq8064-nexus7-flo.dts
>> +++ b/arch/arm/boot/dts/qcom-apq8064-nexus7-flo.dts
>> @@ -282,6 +282,15 @@
>>                       };
>>               };
>>
>> +             reboot_reason: reboot_reason@...3f65c {
>> +                     compatible              = "reboot_reason";
>> +                     reg                     = <0x2A03F65C 0x4>;
>> +                     reason,none             = <0x77665501>;
>> +                     reason,bootloader       = <0x77665500>;
>> +                     reason,recovery         = <0x77665502>;
>> +                     reason,oem              = <0x6f656d00>;
>> +             };
>> +
>
> This address refers to IMEM, which is shared with a number of other
> uses. So I think we should have a simple-mfd (and syscon) with this
> within.

So talking with Arnd some more it looked like IMEM was really just
SRAM. Is that not the case, or is there something else special about
it?  Does it really need simple-mfd and syscon? I'm still fuzzy on how
to use those for this.

>> +     /* initialize specified reasons from DT */
>> +     if (!of_property_read_u32(pdev->dev.of_node, "reason,none", &val))
>> +             reasons[NONE] = val;
>> +     if (!of_property_read_u32(pdev->dev.of_node, "reason,bootloader", &val))
>> +             reasons[BOOTLOADER] = val;
>> +     if (!of_property_read_u32(pdev->dev.of_node, "reason,recovery", &val))
>> +             reasons[RECOVERY] = val;
>> +     if (!of_property_read_u32(pdev->dev.of_node, "reason,oem", &val))
>> +             reasons[OEM] = val;
>
> I would like for this to be less hard coded.

So thinking of this more. Is having something like:

cmds = "default", "bootloader", "recovery";
vals  = <0xmagic1>, <0xmagic2>, <0xmagic3>;

what you're thinking about?

This wouldn't quite handle the "oem-N" options as simply, but they
could define each oem- case explicitly in the DT to support it.

thanks
-john
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/