diff options
| author | Eric Biggers <ebiggers@kernel.org> | 2025-06-30 09:03:16 -0700 |
|---|---|---|
| committer | Eric Biggers <ebiggers@kernel.org> | 2025-06-30 09:26:20 -0700 |
| commit | b7b366087e0f1645f867077a14bab617516d0f57 (patch) | |
| tree | 886ace0d57a94642b9d2a1dfdd2d58ee674c4cf6 /lib/crypto/s390 | |
| parent | b59059a22c5a717284b05385de5c0cbff2879859 (diff) | |
lib/crypto: s390/sha512: Migrate optimized SHA-512 code to library
Instead of exposing the s390-optimized SHA-512 code via s390-specific
crypto_shash algorithms, instead just implement the sha512_blocks()
library function. This is much simpler, it makes the SHA-512 (and
SHA-384) library functions be s390-optimized, and it fixes the
longstanding issue where the s390-optimized SHA-512 code was disabled by
default. SHA-512 still remains available through crypto_shash, but
individual architectures no longer need to handle it.
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250630160320.2888-13-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Diffstat (limited to 'lib/crypto/s390')
| -rw-r--r-- | lib/crypto/s390/sha512.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/crypto/s390/sha512.h b/lib/crypto/s390/sha512.h new file mode 100644 index 000000000000..24744651550c --- /dev/null +++ b/lib/crypto/s390/sha512.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * SHA-512 optimized using the CP Assist for Cryptographic Functions (CPACF) + * + * Copyright 2025 Google LLC + */ +#include <asm/cpacf.h> +#include <linux/cpufeature.h> + +static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha512); + +static void sha512_blocks(struct sha512_block_state *state, + const u8 *data, size_t nblocks) +{ + if (static_branch_likely(&have_cpacf_sha512)) + cpacf_kimd(CPACF_KIMD_SHA_512, state, data, + nblocks * SHA512_BLOCK_SIZE); + else + sha512_blocks_generic(state, data, nblocks); +} + +#define sha512_mod_init_arch sha512_mod_init_arch +static inline void sha512_mod_init_arch(void) +{ + if (cpu_have_feature(S390_CPU_FEATURE_MSA) && + cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512)) + static_branch_enable(&have_cpacf_sha512); +} |