From: Andre Przywara <andre.przywara@arm.com>
To: Matt Mackall <mpm@selenic.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Mark Rutland <mark.rutland@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-crypto@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Ard Biesheuvel <ardb@kernel.org>, Mark Brown <broonie@kernel.org>,
Will Deacon <will@kernel.org>, Ali Saidi <alisaidi@amazon.com>,
Jon Nettleton <jon@solid-run.com>
Subject: [PATCH v4 0/2] hwrng: Add Arm SMCCC TRNG based driver
Date: Sat, 31 Jul 2021 21:48:43 +0100 [thread overview]
Message-ID: <20210731204845.21196-1-andre.przywara@arm.com> (raw)
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
next reply other threads:[~2021-07-31 20:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-31 20:48 Andre Przywara [this message]
2021-07-31 20:48 ` [PATCH v4 1/2] firmware: smccc: Register smccc_trng platform device Andre Przywara
2021-07-31 20:48 ` [PATCH v4 2/2] hwrng: Add Arm SMCCC TRNG based driver Andre Przywara
2021-08-01 16:26 ` [PATCH v4 0/2] " Ard Biesheuvel
2021-08-02 10:40 ` Mark Brown
2021-08-06 12:14 ` Herbert Xu
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