From: Kees Cook <kees@kernel.org>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: "Sebastian Reichel" <sre@kernel.org>,
"Srinivas Kandagatla" <srinivas.kandagatla@linaro.org>,
"Benson Leung" <bleung@chromium.org>,
"Tzung-Bi Shih" <tzungbi@kernel.org>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Tony Luck" <tony.luck@intel.com>,
"Guilherme G. Piccoli" <gpiccoli@igalia.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
kernel@pengutronix.de, linux-kernel@vger.kernel.org,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Mark Brown" <broonie@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Zhang Rui" <rui.zhang@intel.com>,
"Lukasz Luba" <lukasz.luba@arm.com>,
linux-pm@vger.kernel.org, "Søren Andersen" <san@skov.dk>,
"Guenter Roeck" <groeck@chromium.org>,
"Matti Vaittinen" <mazziesaccount@gmail.com>,
"Ahmad Fatoum" <a.fatoum@pengutronix.de>,
"Andrew Morton" <akpm@linux-foundation.org>,
chrome-platform@lists.linux.dev, devicetree@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: RFC: Selecting an NVMEM cell for Power State Change Reason (PSCR) recording
Date: Thu, 2 Oct 2025 09:07:44 -0700 [thread overview]
Message-ID: <202510020904.1E48B7EB@keescook> (raw)
In-Reply-To: <aN5pSWBFRZlNRv3U@pengutronix.de>
On Thu, Oct 02, 2025 at 02:00:09PM +0200, Oleksij Rempel wrote:
> I'm seeking consensus on a minimal, upstream-acceptable way to identify the
> single NVMEM cell used to persist a Power State Change Reason (PSCR). Typical
> targets are battery-backed RTC scratchpads or small EEPROM. The aim is to have
> a tiny breadcrumb available before userspace, across full power cuts, and
> shared by bootloader/kernel/userspace.
> [...]
> * pstore integration (not tried): a backend that uses a nominated NVMEM cell if
> such a nomination is acceptable.
Several years ago I wanted to have tighter integration between pstore
and nvdimm code. The thread is here, for reference:
https://lore.kernel.org/lkml/CAGXu5jLtmb3qinZnX3rScUJLUFdf+pRDVPjy=CS4KUtW9tLHtw@mail.gmail.com/
I'm not sure it it'll be a useful as background, but I thought I'd
mention it. :)
-Kees
--
Kees Cook
prev parent reply other threads:[~2025-10-02 16:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250618120255.3141862-1-o.rempel@pengutronix.de>
2025-10-02 12:00 ` RFC: Selecting an NVMEM cell for Power State Change Reason (PSCR) recording Oleksij Rempel
2025-10-02 16:07 ` Kees Cook [this message]
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