linux-hardening - Re: [PATCH v7 0/8] soc/tegra: fuse: Add ACPI support

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Date: Fri, 15 Dec 2023 17:43:39 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Kartik <kkartik@...dia.com>, Arnd Bergmann <arnd@...db.de>
Cc: Jon Hunter <jonathanh@...dia.com>, Kees Cook <keescook@...omium.org>,
	Andy Shevchenko <andy@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>, pshete@...dia.com,
	petlozup@...dia.com, Yangtao Li <frank.li@...o.com>,
	Rob Herring <robh@...nel.org>, stefank@...dia.com,
	pdeschrijver@...dia.com,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v7 0/8] soc/tegra: fuse: Add ACPI support

On Thu, Dec 14, 2023 at 06:43:47PM +0000, Arnd Bergmann wrote:
> On Thu, Dec 14, 2023, at 17:08, Thierry Reding wrote:
> > On Tue, Oct 17, 2023 at 10:53:14AM +0530, Kartik wrote:
> >> This series of patches add ACPI support for Tegra194 and Tegra234 in
> >> Tegra fuse and apbmisc drivers. It also adds support for Tegra241
> >> which uses ACPI boot.
> >
> > Applied, thanks.
> 
> I'm still a bit puzzled by this series, can you provide some more background?
> 
> Why does an ACPI based system require access to SoC drivers? Shouldn't
> this all be abstracted by the BIOS in some form so the device drivers
> can work standalone rather than calling into this driver?

This driver exposes a couple of things such as SoC family and SKU
information that is not otherwise available. It also exposes FUSE
data which can be used to calibrate certain devices. Most of the
region that contains the fuses is in the keep-out, so perhaps they
aren't needed on Tegra241.

I suppose things like SoC family and such could be exposed differently.
Not sure if ACPI has other ways to expose that.

Let's see if Kartik can shed some light on this.

Thierry

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