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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* GHASH, RISC-V optimized
*
* Copyright (C) 2023 VRULL GmbH
* Copyright (C) 2023 SiFive, Inc.
* Copyright 2026 Google LLC
*/
#include <asm/simd.h>
#include <asm/vector.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_zvkg);
asmlinkage void ghash_zvkg(u8 accumulator[GHASH_BLOCK_SIZE],
const u8 key[GHASH_BLOCK_SIZE],
const u8 *data, size_t nblocks);
#define ghash_preparekey_arch ghash_preparekey_arch
static void ghash_preparekey_arch(struct ghash_key *key,
const u8 raw_key[GHASH_BLOCK_SIZE])
{
/* Save key in POLYVAL format for fallback */
ghash_key_to_polyval(raw_key, &key->h);
/* Save key in GHASH format for zvkg */
memcpy(key->h_raw, raw_key, GHASH_BLOCK_SIZE);
}
#define ghash_blocks_arch ghash_blocks_arch
static void ghash_blocks_arch(struct polyval_elem *acc,
const struct ghash_key *key,
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_zvkg) && likely(may_use_simd())) {
u8 ghash_acc[GHASH_BLOCK_SIZE];
polyval_acc_to_ghash(acc, ghash_acc);
kernel_vector_begin();
ghash_zvkg(ghash_acc, key->h_raw, data, nblocks);
kernel_vector_end();
ghash_acc_to_polyval(ghash_acc, acc);
memzero_explicit(ghash_acc, sizeof(ghash_acc));
} else {
ghash_blocks_generic(acc, &key->h, data, nblocks);
}
}
#define gf128hash_mod_init_arch gf128hash_mod_init_arch
static void gf128hash_mod_init_arch(void)
{
if (riscv_isa_extension_available(NULL, ZVKG) &&
riscv_vector_vlen() >= 128)
static_branch_enable(&have_zvkg);
}
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