linux-kernel - Re: [PATCH/RFC] crypto: Add platform dependencies for CRYPTO_DEV

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Date:   Mon, 23 Apr 2018 10:45:21 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC] crypto: Add platform dependencies for CRYPTO_DEV_CCREE

On Wed, Apr 18, 2018 at 10:47 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> Hi Gilad,
>
> On Wed, Apr 18, 2018 at 6:32 AM, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
>> On Tue, Apr 17, 2018 at 9:14 PM, Geert Uytterhoeven
>> <geert@...ux-m68k.org> wrote:
>>> The ARM TrustZone CryptoCell is found on ARM SoCs only.  Hence make it
>>> depend on ARM or ARM64, unless compile-testing.
>>
>> Actually it is not. Despite what the name suggest, CryptoCell is
>> designed by Arm but is
>> not in fact limited to Arm cores. I think the only requirement is
>> ability to provide an AMBA bus
>> interface. Kudos to our marketing department to make that so clear and
>> so on... :-)
>
> Good to know, I couldn't find any users of the compatible value in DT sources,
> so I had to guess... and missed ;-)

Yes, the original driver that went through staging was for CC 712,
which so new it doesn't yet
have a commercially available silicon yet :-)

I've added the older 710 and 613 support just recently and will be
working with CC hardware implementors
to add the relevant DT bindings for their respective SoCs

>
> Do you have a good suggestion for a platform dependency?
> Based on the above, I'd say "depends on ARM_AMBA || COMPILE_TEST",
> but (currently) ARM_AMBA is selected on ARM or ARM64 only?

So AMBA *as a system bus* is not strictly needed AFAIK in the sense
that you just need
an AMBA to whatever bus interface, so not all system implementing this
actually define ARM_AMBA.

It's actually safer for me to rule out certain architectures rather
than point to which are used.
I'd say ruling out s390, um, alpha, ia64 and m68k is a safe bet.

Do you want to send a patch or shall I?

Thanks,
Gilad


>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds



-- 
Gilad Ben-Yossef
Chief Coffee Drinker

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru