linux-kernel - Re: [PATCH v7 1/5] ARM: add basic support for Trusted Foundations

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Message-ID: <CAOesGMjtHBft71nJUEc7K+2UA_LiWBOVWpbYvJDOnF=NLepLLw@mail.gmail.com>
Date:	Wed, 9 Oct 2013 16:45:41 -0700
From:	Olof Johansson <olof@...om.net>
To:	Michal Simek <monstr@...str.eu>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Dave Martin <Dave.Martin@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v7 1/5] ARM: add basic support for Trusted Foundations

On Tue, Oct 8, 2013 at 1:17 AM, Michal Simek <monstr@...str.eu> wrote:
> Hi,
>
> On 10/04/2013 06:37 PM, Alexandre Courbot wrote:
>> Trusted Foundations is a TrustZone-based secure monitor for ARM that
>> can be invoked using the same SMC-based API on all supported
>> platforms. This patch adds initial basic support for Trusted
>> Foundations using the ARM firmware API. Current features are limited
>> to the ability to boot secondary processors.
>>
>> Note: The API followed by Trusted Foundations does *not* follow the SMC
>> calling conventions. It has nothing to do with PSCI neither and is only
>> relevant to devices that use Trusted Foundations (like most Tegra-based
>> retail devices).
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> Reviewed-by: Tomasz Figa <t.figa@...sung.com>
>> Reviewed-by: Stephen Warren <swarren@...dia.com>
>> ---
>>  .../arm/firmware/tl,trusted-foundations.txt        | 17 +++++
>>  .../devicetree/bindings/vendor-prefixes.txt        |  1 +
>>  arch/arm/Kconfig                                   |  2 +
>>  arch/arm/Makefile                                  |  1 +
>>  arch/arm/firmware/Kconfig                          | 28 ++++++++
>>  arch/arm/firmware/Makefile                         |  1 +
>>  arch/arm/firmware/trusted_foundations.c            | 77 ++++++++++++++++++++++
>>  arch/arm/include/asm/trusted_foundations.h         | 64 ++++++++++++++++++
>>  8 files changed, 191 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt
>>  create mode 100644 arch/arm/firmware/Kconfig
>>  create mode 100644 arch/arm/firmware/Makefile
>>  create mode 100644 arch/arm/firmware/trusted_foundations.c
>>  create mode 100644 arch/arm/include/asm/trusted_foundations.h
>>
>> diff --git a/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt
>> new file mode 100644
>> index 0000000..3954bbd
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundations.txt
>> @@ -0,0 +1,17 @@
>> +Trusted Foundations
>> +
>> +Boards that use the Trusted Foundations secure monitor can signal its
>> +presence by declaring a node compatible with "tl,trusted-foundations"
>> +under the root node.
>> +
>> +Required properties:
>> +- compatible : "tl,trusted-foundations"
>> +- version-major : major version number of Trusted Foundations firmware
>> +- version-minor: minor version number of Trusted Foundations firmware
>> +
>> +Example:
>> +     firmware {
>> +             compatible = "tl,trusted-foundations";
>> +             version-major = <2>;
>> +             version-minor = <8>;
>> +     };
>
> This is just another example how to add sw description to dts.
> I have briefly looked at tegra20.dtsi and there are IPs like timer, intc, etc
> which are in the DTS without any bus.
>
> Add this firmware node to the root is just +1 case to this mess
> but IMHO will be good to have specific DT part which will be used for
> this sw setting which are coming to DTS all the time.
>
> Grant, Rob: Where is the proper location for these type of description?

Usually we've been using the /firmware hierarchy for these kind of things.

Chrome OS uses /firmware/chromeos for some of the information passing
from FW to the OS.

You might want a separate node under /firmware for this, since this is
"just" the secure runtime portion of things, there might be need to
add things for/from the bootloader too.


-Olof
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