linux-kernel - [PATCH v4 0/2] hwrng: Add Arm SMCCC TRNG based driver

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Message-Id: <20210731204845.21196-1-andre.przywara@arm.com>
Date:   Sat, 31 Jul 2021 21:48:43 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Brown <broonie@...nel.org>, Will Deacon <will@...nel.org>,
        Ali Saidi <alisaidi@...zon.com>,
        Jon Nettleton <jon@...id-run.com>
Subject: [PATCH v4 0/2] hwrng: Add Arm SMCCC TRNG based driver

The "Arm True Random Number Generator Firmware Interface"[1] provides
an SMCCC based interface to a true hardware random number generator.
So far we are using that in arch_get_random_seed(), but it might be
useful to expose the entropy through the /dev/hwrng device as well. This
allows to assess the quality of the implementation, by using "rngtest"
from the rng-tools package, for example.

Patch 1 creates a platform device, triggered by the previous discovery
of the SMCCC TRNG service.
Patch 2 implements a hw_random platform driver, which is instantiated
through this said platform device.

The driver can be loaded as module, or built into the kernel.

[1] https://developer.arm.com/documentation/den0098/latest/

Changelog v3 ... v4:
- drop pointless driver loading message
- drop unneeded init() routine

Changelog v2 ... v3:
- split platform device and driver

Changelog v1 ... v2:
- fix building as a module
- de-register device upon exit
- mention module name in Kconfig

Andre Przywara (2):
  firmware: smccc: Register smccc_trng platform device
  hwrng: Add Arm SMCCC TRNG based driver

 drivers/char/hw_random/Kconfig          |  14 +++
 drivers/char/hw_random/Makefile         |   1 +
 drivers/char/hw_random/arm_smccc_trng.c | 123 ++++++++++++++++++++++++
 drivers/firmware/smccc/smccc.c          |  17 ++++
 4 files changed, 155 insertions(+)
 create mode 100644 drivers/char/hw_random/arm_smccc_trng.c

-- 
2.17.6