Hello,
This is a series of patches for exynos-rng driver I've decided to
create after adding support for Exynos5250+ chips. They do not
strictly depend on each other, but I think it is better to send them
as a single patch-set.
The driver requires appropriate DT configuration introduced in
https://patchwork.kernel.org/patch/10106797/
Patch #1 Add support for PRNG in Exynos5250+ SoCs
Patch #2 Improve output performance by using memcpy() rather than a
custom function to retrieve random bytes from registers. Rearrange
the loop for polling the hardware.
Patch #3 Reseed the PRNG after reading 2^16 bytes. Simmilar approach
is implemented in DRBG. (Thanks Stephan Mueller)
Patch #4 Introduce locking to prevent simultaneous access to the
hardware from more than one thread/process.
Changes since v2:
- Remove changes in the loop polling the status register in
exynos_rng_get_random(). Thanks Krzysztof Kozłowski.
- Remove the check for valid values of rng->type from
exynos_rng_probe(). The function wouldn't be called with values other
than mentioned in exynos_rng_dt_match array.
- Applied changes to the commit message of patch #3 requested by Stephan
Mueller.
Changes since v1:
- Added Patch #4.
- Extended commit message for patch #3.
- Changed exynos_prng_type enum and a define according to Krzysztof Kozłowski's
recommendations.
- Brought back cpu_relax() in a rearranged loop in
exynos_rng_get_random().
- Moved an assignment of the read valuea away from an error path.
- Removed dev_info() reporting hardware presence from
exynos_rng_probe().
Łukasz Stelmach (4):
crypto: exynos - Support Exynos5250+ SoCs
crypto: exynos - Improve performance of PRNG
crypto: exynos - Reseed PRNG after generating 2^16 random bytes
crypto: exynos - Introduce mutex to prevent concurrent access to
hardware
.../bindings/crypto/samsung,exynos-rng4.txt | 4 +-
drivers/crypto/exynos-rng.c | 94 ++++++++++++++--------
2 files changed, 62 insertions(+), 36 deletions(-)
--
2.11.0
