History log of /linux-master/arch/arm64/crypto/sha3-ce-core.S
Revision Date Author Comments
# 13150149 02-Mar-2021 Ard Biesheuvel <ardb@kernel.org>

arm64: fpsimd: run kernel mode NEON with softirqs disabled

Kernel mode NEON can be used in task or softirq context, but only in
a non-nesting manner, i.e., softirq context is only permitted if the
interrupt was not taken at a point where the kernel was using the NEON
in task context.

This means all users of kernel mode NEON have to be aware of this
limitation, and either need to provide scalar fallbacks that may be much
slower (up to 20x for AES instructions) and potentially less safe, or
use an asynchronous interface that defers processing to a later time
when the NEON is guaranteed to be available.

Given that grabbing and releasing the NEON is cheap, we can relax this
restriction, by increasing the granularity of kernel mode NEON code, and
always disabling softirq processing while the NEON is being used in task
context.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210302090118.30666-4-ardb@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>


# 9ecc9f31 02-Feb-2021 Ard Biesheuvel <ardb@kernel.org>

crypto: arm64/sha3-ce - simplify NEON yield

Instead of calling into kernel_neon_end() and kernel_neon_begin() (and
potentially into schedule()) from the assembler code when running in
task mode and a reschedule is pending, perform only the preempt count
check in assembler, but simply return early in this case, and let the C
code deal with the consequences.

This reverts commit 7edc86cb1c18b4c274672232117586ea2bef1d9a.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>


# 0e89640b 13-Dec-2019 Mark Brown <broonie@kernel.org>

crypto: arm64 - Use modern annotations for assembly functions

In an effort to clarify and simplify the annotation of assembly functions
in the kernel new macros have been introduced. These replace ENTRY and
ENDPROC and also add a new annotation for static functions which previously
had no ENTRY equivalent. Update the annotations in the crypto code to the
new macros.

There are a small number of files imported from OpenSSL where the assembly
is generated using perl programs, these are not currently annotated at all
and have not been modified.

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>


# 7edc86cb 30-Apr-2018 Ard Biesheuvel <ardb@kernel.org>

crypto: arm64/sha3-ce - yield NEON after every block of input

Avoid excessive scheduling delays under a preemptible kernel by
conditionally yielding the NEON after every block of input.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>


# 15d5910e 18-Jan-2018 Ard Biesheuvel <ardb@kernel.org>

crypto: arm64/sha3 - new v8.2 Crypto Extensions implementation

Implement the various flavours of SHA3 using the new optional
EOR3/RAX1/XAR/BCAX instructions introduced by ARMv8.2.

Tested-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>