linux/drivers/char/hw_random/Kconfig, branch master

Merge tag 'v6.18-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2025-10-04T21:59:29Z

Pull crypto updates from Herbert Xu: "Drivers: - Add ciphertext hiding support to ccp - Add hashjoin, gather and UDMA data move features to hisilicon - Add lz4 and lz77_only to hisilicon - Add xilinx hwrng driver - Add ti driver with ecb/cbc aes support - Add ring buffer idle and command queue telemetry for GEN6 in qat Others: - Use rcu_dereference_all to stop false alarms in rhashtable - Fix CPU number wraparound in padata" * tag 'v6.18-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (78 commits) dt-bindings: rng: hisi-rng: convert to DT schema crypto: doc - Add explicit title heading to API docs hwrng: ks-sa - fix division by zero in ks_sa_rng_init KEYS: X.509: Fix Basic Constraints CA flag parsing crypto: anubis - simplify return statement in anubis_mod_init crypto: hisilicon/qm - set NULL to qm->debug.qm_diff_regs crypto: hisilicon/qm - clear all VF configurations in the hardware crypto: hisilicon - enable error reporting again crypto: hisilicon/qm - mask axi error before memory init crypto: hisilicon/qm - invalidate queues in use crypto: qat - Return pointer directly in adf_ctl_alloc_resources crypto: aspeed - Fix dma_unmap_sg() direction rhashtable: Use rcu_dereference_all and rcu_dereference_all_check crypto: comp - Use same definition of context alloc and free ops crypto: omap - convert from tasklet to BH workqueue crypto: qat - Replace kzalloc() + copy_from_user() with memdup_user() crypto: caam - double the entropy delay interval for retry padata: WQ_PERCPU added to alloc_workqueue users padata: replace use of system_unbound_wq with system_dfl_wq crypto: cryptd - WQ_PERCPU added to alloc_workqueue users ...

char: hw_random: atmel: make it selectable for ARCH_MICROCHIP

2025-09-09T08:34:22Z

LAN969x uses the Atmel HWRNG, so make it selectable for ARCH_MICROCHIP to avoid needing to update depends in future if other Microchip SoC-s use it as well. Signed-off-by: Robert Marko Acked-by: Daniel Machon Signed-off-by: Nicolas Ferre

hwrng: nomadik - add ARM_AMBA dependency

2025-08-16T09:24:31Z

Compile-testing this driver is only possible when the AMBA bus driver is available in the kernel: x86_64-linux-ld: drivers/char/hw_random/nomadik-rng.o: in function `nmk_rng_remove': nomadik-rng.c:(.text+0x67): undefined reference to `amba_release_regions' x86_64-linux-ld: drivers/char/hw_random/nomadik-rng.o: in function `nmk_rng_probe': nomadik-rng.c:(.text+0xee): undefined reference to `amba_request_regions' x86_64-linux-ld: nomadik-rng.c:(.text+0x18d): undefined reference to `amba_release_regions' The was previously implied by the 'depends on ARCH_NOMADIK', but needs to be specified for the COMPILE_TEST case. Fixes: d5e93b3374e4 ("hwrng: Kconfig - Add helper dependency on COMPILE_TEST") Signed-off-by: Arnd Bergmann Signed-off-by: Herbert Xu

hwrng: Kconfig - Fix indentation of HW_RANDOM_CN10K help text

2025-03-02T07:19:43Z

Change the indentation of the help text of the HW_RANDOM_CN10K symbol from one TAB plus one space to one TAB plus two spaces, as is customary. Signed-off-by: Geert Uytterhoeven Reviewed-by: Dragan Simic Signed-off-by: Herbert Xu

hwrng: rockchip - add support for rk3588's standalone TRNG

2025-02-22T07:56:02Z

The RK3588 SoC includes several TRNGs, one part of the Crypto IP block, and the other one (referred to as "trngv1") as a standalone new IP. Add support for this new standalone TRNG to the driver by both generalising it to support multiple different rockchip RNGs and then implementing the required functionality for the new hardware. This work was partly based on the downstream vendor driver by Rockchip's Lin Jinhan, which is why they are listed as a Co-author. While the hardware does support notifying the CPU with an IRQ when the random data is ready, I've discovered while implementing the code to use this interrupt that this results in significantly slower throughput of the TRNG even when under heavy CPU load. I assume this is because with only 32 bytes of data per invocation, the overhead of reinitialising a completion, enabling the interrupt, sleeping and then triggering the completion in the IRQ handler is way more expensive than busylooping. Speaking of busylooping, the poll interval for reading the ISTAT is an atomic read with a delay of 0. In my testing, I've found that this gives us the largest throughput, and it appears the random data is ready pretty much the moment we begin polling, as increasing the poll delay leads to a drop in throughput significant enough to not just be due to the poll interval missing the ideal timing by a microsecond or two. According to downstream, the IP should take 1024 clock cycles to generate 56 bits of random data, which at 150MHz should work out to 6.8us. I did not test whether the data really does take 256/56*6.8us to arrive, though changing the readl to a __raw_readl makes no difference in throughput, and this data does pass the rngtest FIPS checks, so I'm not entirely sure what's going on but I presume it's got something to do with the AHB bus speed and the memory barriers that mainline's readl/writel functions insert. The only other current SoC that uses this new IP is the Rockchip RV1106, but that SoC does not have mainline support as of the time of writing, so we make no effort to declare it as supported for now. Co-developed-by: Lin Jinhan Signed-off-by: Lin Jinhan Signed-off-by: Nicolas Frattaroli Signed-off-by: Herbert Xu

hwrng: Kconfig - Move one "tristate" Kconfig description to the usual place

2025-02-09T10:08:11Z

It's pretty usual to have "tristate" descriptions in Kconfig files placed immediately after the actual configuration options, so correct the position of one misplaced "tristate" spotted in the hw_random Kconfig file. No intended functional changes are introduced by this trivial cleanup. Signed-off-by: Dragan Simic Signed-off-by: Herbert Xu

hwrng: Kconfig - Use tabs as leading whitespace consistently in Kconfig

2025-02-09T10:08:11Z

Replace instances of leading size-eight groups of space characters with the usual tab characters, as spotted in the hw_random Kconfig file. No intended functional changes are introduced by this trivial cleanup. Signed-off-by: Dragan Simic Signed-off-by: Herbert Xu

hwrng: amd - remove reference to removed PPC_MAPLE config

2024-11-15T11:52:51Z

Commit 62f8f307c80e ("powerpc/64: Remove maple platform") removes the PPC_MAPLE config as a consequence of the platform’s removal. The config definition of HW_RANDOM_AMD refers to this removed config option in its dependencies. Remove the reference to the removed config option. Signed-off-by: Lukas Bulwahn Acked-by: Michael Ellerman (powerpc) Signed-off-by: Herbert Xu

hwrng: bcm74110 - Add Broadcom BCM74110 RNG driver

2024-11-10T03:51:26Z

Add a driver for the random number generator present on the Broadcom BCM74110 SoC. Signed-off-by: Markus Mayer Signed-off-by: Herbert Xu

hwrng: airoha - add support for Airoha EN7581 TRNG

2024-10-28T10:33:10Z

Add support for Airoha TRNG. The Airoha SoC provide a True RNG module that can output 4 bytes of raw data at times. The module makes use of various noise source to provide True Random Number Generation. On probe the module is reset to operate Health Test and verify correct execution of it. The module can also provide DRBG function but the execution mode is mutually exclusive, running as TRNG doesn't permit to also run it as DRBG. Signed-off-by: Christian Marangi Reviewed-by: Martin Kaiser Signed-off-by: Herbert Xu