linux-kernel - [PATCH v2 0/2] Driver for Open Profile for DICE

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Date:   Thu,  9 Dec 2021 15:11:21 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        David Brazdil <dbrazdil@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Andrew Scull <ascull@...gle.com>,
        Will Deacon <will@...nel.org>
Subject: [PATCH v2 0/2] Driver for Open Profile for DICE

Open Profile for DICE is a secret derivation protocol used by some
Android devices. The firmware/bootloader generates the secrets and hands
them over to Linux in a reserved memory region.
See https://pigweed.googlesource.com/open-dice for more details.

This patchset adds the corresponding DeviceTree bindings and a driver
that takes ownership of the memory region and exposes it to userspace
via a misc device.

The patches are based on top of v5.16-rc4 and can also be found here:
  https://android-kvm.googlesource.com/linux topic/dice_v2

Changes since v1:
  * converted to miscdevice
  * all mappings now write-combine to simplify semantics
  * removed atomic state, any attempt at exclusive access
  * simplified wipe, applied on ioctl, not on release
  * fixed ioctl return value

David Brazdil (2):
  dt-bindings: firmware: Add Open Profile for DICE
  misc: dice: Add driver to forward secrets to userspace

 .../devicetree/bindings/firmware/dice.yaml    |  51 ++++++
 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 drivers/misc/Kconfig                          |   8 +
 drivers/misc/Makefile                         |   1 +
 drivers/misc/dice.c                           | 161 ++++++++++++++++++
 include/uapi/linux/dice.h                     |  14 ++
 6 files changed, 236 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/dice.yaml
 create mode 100644 drivers/misc/dice.c
 create mode 100644 include/uapi/linux/dice.h

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2.34.1.400.ga245620fadb-goog