mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
a8c60a9aca
As I did for sha512_blocks(), reorganize x86's sha256_blocks() to be just a static_call. To achieve that, for each assembly function add a C function that handles the kernel-mode FPU section and fallback. While this increases total code size slightly, the amount of code actually executed on a given system does not increase, and it is slightly more efficient since it eliminates the extra static_key. It also makes the assembly functions be called with standard direct calls instead of static calls, eliminating the need for ANNOTATE_NOENDBR. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250704023958.73274-2-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* SHA-256 optimized for x86_64
|
|
*
|
|
* Copyright 2025 Google LLC
|
|
*/
|
|
#include <asm/fpu/api.h>
|
|
#include <crypto/internal/simd.h>
|
|
#include <linux/static_call.h>
|
|
|
|
DEFINE_STATIC_CALL(sha256_blocks_x86, sha256_blocks_generic);
|
|
|
|
#define DEFINE_X86_SHA256_FN(c_fn, asm_fn) \
|
|
asmlinkage void asm_fn(struct sha256_block_state *state, \
|
|
const u8 *data, size_t nblocks); \
|
|
static void c_fn(struct sha256_block_state *state, const u8 *data, \
|
|
size_t nblocks) \
|
|
{ \
|
|
if (likely(crypto_simd_usable())) { \
|
|
kernel_fpu_begin(); \
|
|
asm_fn(state, data, nblocks); \
|
|
kernel_fpu_end(); \
|
|
} else { \
|
|
sha256_blocks_generic(state, data, nblocks); \
|
|
} \
|
|
}
|
|
|
|
DEFINE_X86_SHA256_FN(sha256_blocks_ssse3, sha256_transform_ssse3);
|
|
DEFINE_X86_SHA256_FN(sha256_blocks_avx, sha256_transform_avx);
|
|
DEFINE_X86_SHA256_FN(sha256_blocks_avx2, sha256_transform_rorx);
|
|
DEFINE_X86_SHA256_FN(sha256_blocks_ni, sha256_ni_transform);
|
|
|
|
static void sha256_blocks(struct sha256_block_state *state,
|
|
const u8 *data, size_t nblocks)
|
|
{
|
|
static_call(sha256_blocks_x86)(state, data, nblocks);
|
|
}
|
|
|
|
#define sha256_mod_init_arch sha256_mod_init_arch
|
|
static inline void sha256_mod_init_arch(void)
|
|
{
|
|
if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
|
|
static_call_update(sha256_blocks_x86, sha256_blocks_ni);
|
|
} else 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(sha256_blocks_x86,
|
|
sha256_blocks_avx2);
|
|
else
|
|
static_call_update(sha256_blocks_x86,
|
|
sha256_blocks_avx);
|
|
} else if (boot_cpu_has(X86_FEATURE_SSSE3)) {
|
|
static_call_update(sha256_blocks_x86, sha256_blocks_ssse3);
|
|
}
|
|
}
|