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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* ChaCha and HChaCha functions (x86_64 optimized)
*
* Copyright (C) 2015 Martin Willi
*/
#include <asm/simd.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/sizes.h>
asmlinkage void chacha_block_xor_ssse3(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_ssse3(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void hchacha_block_ssse3(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds);
asmlinkage void chacha_2block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_8block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_2block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_8block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_simd);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx2);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx512vl);
static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
{
len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
}
static void chacha_dosimd(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
if (static_branch_likely(&chacha_use_avx512vl)) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
chacha_8block_xor_avx512vl(state, dst, src, bytes,
nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state->x[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
chacha_8block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
chacha_4block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
chacha_2block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 2);
return;
}
}
if (static_branch_likely(&chacha_use_avx2)) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state->x[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes > CHACHA_BLOCK_SIZE) {
chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 2);
return;
}
}
while (bytes >= CHACHA_BLOCK_SIZE * 4) {
chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 4;
src += CHACHA_BLOCK_SIZE * 4;
dst += CHACHA_BLOCK_SIZE * 4;
state->x[12] += 4;
}
if (bytes > CHACHA_BLOCK_SIZE) {
chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
state->x[12]++;
}
}
static void hchacha_block_arch(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds)
{
if (!static_branch_likely(&chacha_use_simd)) {
hchacha_block_generic(state, out, nrounds);
} else {
kernel_fpu_begin();
hchacha_block_ssse3(state, out, nrounds);
kernel_fpu_end();
}
}
static void chacha_crypt_arch(struct chacha_state *state, u8 *dst,
const u8 *src, unsigned int bytes, int nrounds)
{
if (!static_branch_likely(&chacha_use_simd) ||
bytes <= CHACHA_BLOCK_SIZE)
return chacha_crypt_generic(state, dst, src, bytes, nrounds);
do {
unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
kernel_fpu_begin();
chacha_dosimd(state, dst, src, todo, nrounds);
kernel_fpu_end();
bytes -= todo;
src += todo;
dst += todo;
} while (bytes);
}
#define chacha_mod_init_arch chacha_mod_init_arch
static void chacha_mod_init_arch(void)
{
if (!boot_cpu_has(X86_FEATURE_SSSE3))
return;
static_branch_enable(&chacha_use_simd);
if (boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
static_branch_enable(&chacha_use_avx2);
if (boot_cpu_has(X86_FEATURE_AVX512VL) &&
boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */
static_branch_enable(&chacha_use_avx512vl);
}
}
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