1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * SHA-512 optimized using the CP Assist for Cryptographic Functions (CPACF)
4 *
5 * Copyright 2025 Google LLC
6 */
7 #include <asm/cpacf.h>
8 #include <linux/cpufeature.h>
9
10 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha512);
11
sha512_blocks(struct sha512_block_state * state,const u8 * data,size_t nblocks)12 static void sha512_blocks(struct sha512_block_state *state,
13 const u8 *data, size_t nblocks)
14 {
15 if (static_branch_likely(&have_cpacf_sha512))
16 cpacf_kimd(CPACF_KIMD_SHA_512, state, data,
17 nblocks * SHA512_BLOCK_SIZE);
18 else
19 sha512_blocks_generic(state, data, nblocks);
20 }
21
22 #define sha512_mod_init_arch sha512_mod_init_arch
sha512_mod_init_arch(void)23 static inline void sha512_mod_init_arch(void)
24 {
25 if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
26 cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512))
27 static_branch_enable(&have_cpacf_sha512);
28 }
29