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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ChaCha stream cipher (P10 accelerated)
*
* Copyright 2023- IBM Corp. All rights reserved.
*/
#include <crypto/chacha.h>
#include <crypto/internal/simd.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/sizes.h>
#include <asm/simd.h>
#include <asm/switch_to.h>
asmlinkage void chacha_p10le_8x(const struct chacha_state *state, u8 *dst,
const u8 *src, unsigned int len, int nrounds);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
static void vsx_begin(void)
{
preempt_disable();
enable_kernel_vsx();
}
static void vsx_end(void)
{
disable_kernel_vsx();
preempt_enable();
}
static void chacha_p10_do_8x(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
unsigned int l = bytes & ~0x0FF;
if (l > 0) {
chacha_p10le_8x(state, dst, src, l, nrounds);
bytes -= l;
src += l;
dst += l;
state->x[12] += l / CHACHA_BLOCK_SIZE;
}
if (bytes > 0)
chacha_crypt_generic(state, dst, src, bytes, nrounds);
}
void hchacha_block_arch(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds)
{
hchacha_block_generic(state, out, nrounds);
}
EXPORT_SYMBOL(hchacha_block_arch);
void chacha_crypt_arch(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
if (!static_branch_likely(&have_p10) || bytes <= CHACHA_BLOCK_SIZE ||
!crypto_simd_usable())
return chacha_crypt_generic(state, dst, src, bytes, nrounds);
do {
unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
vsx_begin();
chacha_p10_do_8x(state, dst, src, todo, nrounds);
vsx_end();
bytes -= todo;
src += todo;
dst += todo;
} while (bytes);
}
EXPORT_SYMBOL(chacha_crypt_arch);
bool chacha_is_arch_optimized(void)
{
return static_key_enabled(&have_p10);
}
EXPORT_SYMBOL(chacha_is_arch_optimized);
static int __init chacha_p10_init(void)
{
if (cpu_has_feature(CPU_FTR_ARCH_31))
static_branch_enable(&have_p10);
return 0;
}
subsys_initcall(chacha_p10_init);
static void __exit chacha_p10_exit(void)
{
}
module_exit(chacha_p10_exit);
MODULE_DESCRIPTION("ChaCha stream cipher (P10 accelerated)");
MODULE_AUTHOR("Danny Tsen <dtsen@linux.ibm.com>");
MODULE_LICENSE("GPL v2");
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