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13150149 |
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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>
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9ecc9f31 |
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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>
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0e89640b |
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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>
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7edc86cb |
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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>
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15d5910e |
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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>
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