1*e96cb950SEric Biggers /* SPDX-License-Identifier: GPL-2.0-or-later */
2*e96cb950SEric Biggers /*
3*e96cb950SEric Biggers * SHA-256 optimized using the CP Assist for Cryptographic Functions (CPACF)
4*e96cb950SEric Biggers *
5*e96cb950SEric Biggers * Copyright 2025 Google LLC
6*e96cb950SEric Biggers */
7*e96cb950SEric Biggers #include <asm/cpacf.h>
8*e96cb950SEric Biggers #include <linux/cpufeature.h>
9*e96cb950SEric Biggers
10*e96cb950SEric Biggers static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha256);
11*e96cb950SEric Biggers
sha256_blocks(struct sha256_block_state * state,const u8 * data,size_t nblocks)12*e96cb950SEric Biggers static void sha256_blocks(struct sha256_block_state *state,
13*e96cb950SEric Biggers const u8 *data, size_t nblocks)
14*e96cb950SEric Biggers {
15*e96cb950SEric Biggers if (static_branch_likely(&have_cpacf_sha256))
16*e96cb950SEric Biggers cpacf_kimd(CPACF_KIMD_SHA_256, state, data,
17*e96cb950SEric Biggers nblocks * SHA256_BLOCK_SIZE);
18*e96cb950SEric Biggers else
19*e96cb950SEric Biggers sha256_blocks_generic(state, data, nblocks);
20*e96cb950SEric Biggers }
21*e96cb950SEric Biggers
22*e96cb950SEric Biggers #define sha256_mod_init_arch sha256_mod_init_arch
sha256_mod_init_arch(void)23*e96cb950SEric Biggers static inline void sha256_mod_init_arch(void)
24*e96cb950SEric Biggers {
25*e96cb950SEric Biggers if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
26*e96cb950SEric Biggers cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
27*e96cb950SEric Biggers static_branch_enable(&have_cpacf_sha256);
28*e96cb950SEric Biggers }
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