/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * x86-optimized SHA-512 block function
 *
 * Copyright 2025 Google LLC
 */
#include <asm/fpu/api.h>
#include <linux/static_call.h>

DEFINE_STATIC_CALL(sha512_blocks_x86, sha512_blocks_generic);

#define DEFINE_X86_SHA512_FN(c_fn, asm_fn)                                 \
        asmlinkage void asm_fn(struct sha512_block_state *state,           \
                               const u8 *data, size_t nblocks);            \
        static void c_fn(struct sha512_block_state *state, const u8 *data, \
                         size_t nblocks)                                   \
        {                                                                  \
                if (likely(irq_fpu_usable())) {                            \
                        kernel_fpu_begin();                                \
                        asm_fn(state, data, nblocks);                      \
                        kernel_fpu_end();                                  \
                } else {                                                   \
                        sha512_blocks_generic(state, data, nblocks);       \
                }                                                          \
        }

DEFINE_X86_SHA512_FN(sha512_blocks_ssse3, sha512_transform_ssse3);
DEFINE_X86_SHA512_FN(sha512_blocks_avx, sha512_transform_avx);
DEFINE_X86_SHA512_FN(sha512_blocks_avx2, sha512_transform_rorx);

static void sha512_blocks(struct sha512_block_state *state,
                          const u8 *data, size_t nblocks)
{
        static_call(sha512_blocks_x86)(state, data, nblocks);
}

#define sha512_mod_init_arch sha512_mod_init_arch
static void sha512_mod_init_arch(void)
{
        if (cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL) &&
            boot_cpu_has(X86_FEATURE_AVX)) {
                if (boot_cpu_has(X86_FEATURE_AVX2) &&
                    boot_cpu_has(X86_FEATURE_BMI2))
                        static_call_update(sha512_blocks_x86,
                                           sha512_blocks_avx2);
                else
                        static_call_update(sha512_blocks_x86,
                                           sha512_blocks_avx);
        } else if (boot_cpu_has(X86_FEATURE_SSSE3)) {
                static_call_update(sha512_blocks_x86, sha512_blocks_ssse3);
        }
}