linux-kernel - [PATCH v3 0/3] firmware: Add boot information to sysfs

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Message-Id: <20220204072234.304543-1-joel@jms.id.au>
Date:   Fri,  4 Feb 2022 17:52:31 +1030
From:   Joel Stanley <joel@....id.au>
To:     Arnd Bergmann <arnd@...db.de>, Andrew Jeffery <andrew@...id.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org
Subject: [PATCH v3 0/3] firmware: Add boot information to sysfs

v3 resolves Greg's review for the bootinfo header and macros, and drops
uart_boot as it's unlikely to be common across platforms.

v2 reworks the series to put the sysfs properties in the core, and
optionally show them with the is_visible() callback.

This is the second iteration of this idea. The first used socinfo
custom attribute groups, but Arnd suggested we make this something
standardised under /sys/firmware instead:

 http://lore.kernel.org/all/CAK8P3a3MRf0aGt1drkgsuZyBbeoy+S7Ha18SBM01q+3f33oL+Q@mail.gmail.com

Some ARM systems have a firmware that provides a hardware root of
trust. It's useful for the system to know how this root of trust has
been configured, so provide a standardised interface that expose this
information to userspace.

This is implemented as a sysfs attribute group registration in the
driver core, with platforms populating values obtained from firmware at
kernel boot time.

Patch 2 provides a user of the properties on an ARM system.

Patch 3 is new in v2 and is an example of populating bootinfo with the
EFI secure boot status.

Joel Stanley (3):
  firmware: Add boot information to sysfs
  ARM: aspeed: Add secure boot controller support
  x86/setup: Populate bootinfo with secure boot status

 .../ABI/testing/sysfs-firmware-bootinfo       | 37 +++++++++
 arch/x86/kernel/setup.c                       |  6 ++
 drivers/base/firmware.c                       | 80 +++++++++++++++++++
 drivers/soc/aspeed/aspeed-socinfo.c           | 44 +++++++++-
 include/linux/firmware_bootinfo.h             | 48 +++++++++++
 5 files changed, 214 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/ABI/testing/sysfs-firmware-bootinfo
 create mode 100644 include/linux/firmware_bootinfo.h

-- 
2.34.1