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5f6cb2e617
Instead of calling into kernel_neon_end() and kernel_neon_begin() (and
potentially into schedule()) from the assembler code when running in
task mode and a reschedule is pending, perform only the preempt count
check in assembler, but simply return early in this case, and let the C
code deal with the consequences.
This reverts commit 6caf7adc5e.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <asm/unaligned.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/simd.h>
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#include <crypto/sha2.h>
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#include <crypto/sha512_base.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("sha384");
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MODULE_ALIAS_CRYPTO("sha512");
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asmlinkage int sha512_ce_transform(struct sha512_state *sst, u8 const *src,
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int blocks);
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asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
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static void __sha512_ce_transform(struct sha512_state *sst, u8 const *src,
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int blocks)
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{
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while (blocks) {
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int rem;
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kernel_neon_begin();
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rem = sha512_ce_transform(sst, src, blocks);
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kernel_neon_end();
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src += (blocks - rem) * SHA512_BLOCK_SIZE;
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blocks = rem;
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}
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}
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static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
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int blocks)
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{
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sha512_block_data_order(sst->state, src, blocks);
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}
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static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
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: __sha512_block_data_order;
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sha512_base_do_update(desc, data, len, fn);
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return 0;
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}
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static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
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: __sha512_block_data_order;
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sha512_base_do_update(desc, data, len, fn);
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sha512_base_do_finalize(desc, fn);
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return sha512_base_finish(desc, out);
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}
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static int sha512_ce_final(struct shash_desc *desc, u8 *out)
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{
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sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
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: __sha512_block_data_order;
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sha512_base_do_finalize(desc, fn);
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return sha512_base_finish(desc, out);
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}
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static struct shash_alg algs[] = { {
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.init = sha384_base_init,
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.update = sha512_ce_update,
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.final = sha512_ce_final,
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.finup = sha512_ce_finup,
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.descsize = sizeof(struct sha512_state),
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.digestsize = SHA384_DIGEST_SIZE,
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.base.cra_name = "sha384",
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.base.cra_driver_name = "sha384-ce",
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.base.cra_priority = 200,
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.base.cra_blocksize = SHA512_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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}, {
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.init = sha512_base_init,
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.update = sha512_ce_update,
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.final = sha512_ce_final,
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.finup = sha512_ce_finup,
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.descsize = sizeof(struct sha512_state),
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.digestsize = SHA512_DIGEST_SIZE,
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.base.cra_name = "sha512",
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.base.cra_driver_name = "sha512-ce",
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.base.cra_priority = 200,
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.base.cra_blocksize = SHA512_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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} };
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static int __init sha512_ce_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha512_ce_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_cpu_feature_match(SHA512, sha512_ce_mod_init);
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module_exit(sha512_ce_mod_fini);
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