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path: root/arch/arm64/crypto/sha512-ce-core.S
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2021-04-12arm64: fpsimd: run kernel mode NEON with softirqs disabledArd Biesheuvel
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>
2021-02-10crypto: arm64/sha512-ce - simplify NEON yieldArd Biesheuvel
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 6caf7adc5e458f77f550b6c6ca8effa152d61b4a. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-12-20crypto: arm64 - Use modern annotations for assembly functionsMark Brown
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>
2018-05-12crypto: arm64/sha512-ce - yield NEON after every block of inputArd Biesheuvel
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>
2018-01-26crypto: arm64/sha512 - fix/improve new v8.2 Crypto Extensions codeArd Biesheuvel
Add a missing symbol export that prevents this code to be built as a module. Also, move the round constant table to the .rodata section, and use a more optimized version of the core transform. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-01-18crypto: arm64 - implement SHA-512 using special instructionsArd Biesheuvel
Implement the SHA-512 using the new special instructions that have been introduced as an optional extension in ARMv8.2. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Steve Capper <steve.capper@arm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>