1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * SHA-256 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_sha256); 11 12 static void sha256_blocks(struct sha256_block_state *state, 13 const u8 *data, size_t nblocks) 14 { 15 if (static_branch_likely(&have_cpacf_sha256)) 16 cpacf_kimd(CPACF_KIMD_SHA_256, state, data, 17 nblocks * SHA256_BLOCK_SIZE); 18 else 19 sha256_blocks_generic(state, data, nblocks); 20 } 21 22 #define sha256_mod_init_arch sha256_mod_init_arch 23 static inline void sha256_mod_init_arch(void) 24 { 25 if (cpu_have_feature(S390_CPU_FEATURE_MSA) && 26 cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256)) 27 static_branch_enable(&have_cpacf_sha256); 28 } 29