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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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16c0c4e165
The AVX2 implementation also uses BMI2 instructions, but doesn't test for their availability. The assumption that AVX2 and BMI2 always go together is false. Some Haswells have AVX2 but not BMI2. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
323 lines
8.0 KiB
C
323 lines
8.0 KiB
C
/*
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* Cryptographic API.
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*
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* Glue code for the SHA256 Secure Hash Algorithm assembler
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* implementation using supplemental SSE3 / AVX / AVX2 instructions.
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*
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* This file is based on sha256_generic.c
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*
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* Copyright (C) 2013 Intel Corporation.
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*
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* Author:
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* Tim Chen <tim.c.chen@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <crypto/sha.h>
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#include <asm/byteorder.h>
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#include <asm/i387.h>
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#include <asm/xcr.h>
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#include <asm/xsave.h>
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#include <linux/string.h>
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asmlinkage void sha256_transform_ssse3(const char *data, u32 *digest,
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u64 rounds);
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#ifdef CONFIG_AS_AVX
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asmlinkage void sha256_transform_avx(const char *data, u32 *digest,
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u64 rounds);
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#endif
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#ifdef CONFIG_AS_AVX2
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asmlinkage void sha256_transform_rorx(const char *data, u32 *digest,
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u64 rounds);
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#endif
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static asmlinkage void (*sha256_transform_asm)(const char *, u32 *, u64);
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static int sha256_ssse3_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA256_H0;
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sctx->state[1] = SHA256_H1;
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sctx->state[2] = SHA256_H2;
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sctx->state[3] = SHA256_H3;
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sctx->state[4] = SHA256_H4;
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sctx->state[5] = SHA256_H5;
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sctx->state[6] = SHA256_H6;
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sctx->state[7] = SHA256_H7;
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sctx->count = 0;
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return 0;
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}
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static int __sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len, unsigned int partial)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int done = 0;
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sctx->count += len;
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if (partial) {
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done = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, done);
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sha256_transform_asm(sctx->buf, sctx->state, 1);
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}
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if (len - done >= SHA256_BLOCK_SIZE) {
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const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
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sha256_transform_asm(data + done, sctx->state, (u64) rounds);
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done += rounds * SHA256_BLOCK_SIZE;
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}
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memcpy(sctx->buf, data + done, len - done);
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return 0;
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}
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static int sha256_ssse3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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int res;
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/* Handle the fast case right here */
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if (partial + len < SHA256_BLOCK_SIZE) {
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sctx->count += len;
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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if (!irq_fpu_usable()) {
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res = crypto_sha256_update(desc, data, len);
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} else {
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kernel_fpu_begin();
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res = __sha256_ssse3_update(desc, data, len, partial);
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kernel_fpu_end();
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}
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return res;
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}
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/* Add padding and return the message digest. */
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static int sha256_ssse3_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int i, index, padlen;
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__be32 *dst = (__be32 *)out;
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__be64 bits;
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 and append length */
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index = sctx->count % SHA256_BLOCK_SIZE;
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padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index);
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if (!irq_fpu_usable()) {
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crypto_sha256_update(desc, padding, padlen);
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crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits));
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} else {
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kernel_fpu_begin();
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/* We need to fill a whole block for __sha256_ssse3_update() */
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if (padlen <= 56) {
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sctx->count += padlen;
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memcpy(sctx->buf + index, padding, padlen);
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} else {
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__sha256_ssse3_update(desc, padding, padlen, index);
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}
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__sha256_ssse3_update(desc, (const u8 *)&bits,
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sizeof(bits), 56);
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kernel_fpu_end();
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}
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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}
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static int sha256_ssse3_export(struct shash_desc *desc, void *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int sha256_ssse3_import(struct shash_desc *desc, const void *in)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static int sha224_ssse3_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA224_H0;
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sctx->state[1] = SHA224_H1;
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sctx->state[2] = SHA224_H2;
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sctx->state[3] = SHA224_H3;
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sctx->state[4] = SHA224_H4;
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sctx->state[5] = SHA224_H5;
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sctx->state[6] = SHA224_H6;
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sctx->state[7] = SHA224_H7;
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sctx->count = 0;
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return 0;
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}
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static int sha224_ssse3_final(struct shash_desc *desc, u8 *hash)
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{
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u8 D[SHA256_DIGEST_SIZE];
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sha256_ssse3_final(desc, D);
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memcpy(hash, D, SHA224_DIGEST_SIZE);
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memset(D, 0, SHA256_DIGEST_SIZE);
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return 0;
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}
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static struct shash_alg algs[] = { {
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.digestsize = SHA256_DIGEST_SIZE,
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.init = sha256_ssse3_init,
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.update = sha256_ssse3_update,
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.final = sha256_ssse3_final,
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.export = sha256_ssse3_export,
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.import = sha256_ssse3_import,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-ssse3",
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.cra_priority = 150,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.digestsize = SHA224_DIGEST_SIZE,
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.init = sha224_ssse3_init,
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.update = sha256_ssse3_update,
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.final = sha224_ssse3_final,
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.export = sha256_ssse3_export,
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.import = sha256_ssse3_import,
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.descsize = sizeof(struct sha256_state),
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-ssse3",
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.cra_priority = 150,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA224_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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} };
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#ifdef CONFIG_AS_AVX
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static bool __init avx_usable(void)
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{
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u64 xcr0;
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if (!cpu_has_avx || !cpu_has_osxsave)
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return false;
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xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
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if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
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pr_info("AVX detected but unusable.\n");
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return false;
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}
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return true;
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}
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#endif
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static int __init sha256_ssse3_mod_init(void)
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{
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/* test for SSSE3 first */
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if (cpu_has_ssse3)
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sha256_transform_asm = sha256_transform_ssse3;
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#ifdef CONFIG_AS_AVX
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/* allow AVX to override SSSE3, it's a little faster */
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if (avx_usable()) {
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#ifdef CONFIG_AS_AVX2
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if (boot_cpu_has(X86_FEATURE_AVX2) && boot_cpu_has(X86_FEATURE_BMI2))
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sha256_transform_asm = sha256_transform_rorx;
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else
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#endif
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sha256_transform_asm = sha256_transform_avx;
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}
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#endif
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if (sha256_transform_asm) {
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#ifdef CONFIG_AS_AVX
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if (sha256_transform_asm == sha256_transform_avx)
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pr_info("Using AVX optimized SHA-256 implementation\n");
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#ifdef CONFIG_AS_AVX2
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else if (sha256_transform_asm == sha256_transform_rorx)
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pr_info("Using AVX2 optimized SHA-256 implementation\n");
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#endif
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else
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#endif
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pr_info("Using SSSE3 optimized SHA-256 implementation\n");
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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pr_info("Neither AVX nor SSSE3 is available/usable.\n");
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return -ENODEV;
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}
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static void __exit sha256_ssse3_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_init(sha256_ssse3_mod_init);
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module_exit(sha256_ssse3_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm, Supplemental SSE3 accelerated");
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MODULE_ALIAS("sha256");
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MODULE_ALIAS("sha224");
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