5a69e1b73d
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 7df8d16475.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
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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/sha1.h>
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#include <crypto/sha1_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("SHA1 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("sha1");
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struct sha1_ce_state {
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struct sha1_state sst;
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u32 finalize;
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};
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extern const u32 sha1_ce_offsetof_count;
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extern const u32 sha1_ce_offsetof_finalize;
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asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
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int blocks);
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static void __sha1_ce_transform(struct sha1_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 = sha1_ce_transform(container_of(sst, struct sha1_ce_state,
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sst), src, blocks);
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kernel_neon_end();
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src += (blocks - rem) * SHA1_BLOCK_SIZE;
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blocks = rem;
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}
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}
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const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
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const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
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static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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if (!crypto_simd_usable())
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return crypto_sha1_update(desc, data, len);
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sctx->finalize = 0;
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sha1_base_do_update(desc, data, len, __sha1_ce_transform);
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return 0;
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}
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static int sha1_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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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
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if (!crypto_simd_usable())
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return crypto_sha1_finup(desc, data, len, out);
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/*
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* Allow the asm code to perform the finalization if there is no
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* partial data and the input is a round multiple of the block size.
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*/
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sctx->finalize = finalize;
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sha1_base_do_update(desc, data, len, __sha1_ce_transform);
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if (!finalize)
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sha1_base_do_finalize(desc, __sha1_ce_transform);
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return sha1_base_finish(desc, out);
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}
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static int sha1_ce_final(struct shash_desc *desc, u8 *out)
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{
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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if (!crypto_simd_usable())
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return crypto_sha1_finup(desc, NULL, 0, out);
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sctx->finalize = 0;
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sha1_base_do_finalize(desc, __sha1_ce_transform);
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return sha1_base_finish(desc, out);
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}
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static int sha1_ce_export(struct shash_desc *desc, void *out)
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{
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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memcpy(out, &sctx->sst, sizeof(struct sha1_state));
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return 0;
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}
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static int sha1_ce_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_ce_state *sctx = shash_desc_ctx(desc);
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memcpy(&sctx->sst, in, sizeof(struct sha1_state));
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sctx->finalize = 0;
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return 0;
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}
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static struct shash_alg alg = {
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.init = sha1_base_init,
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.update = sha1_ce_update,
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.final = sha1_ce_final,
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.finup = sha1_ce_finup,
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.import = sha1_ce_import,
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.export = sha1_ce_export,
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.descsize = sizeof(struct sha1_ce_state),
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.statesize = sizeof(struct sha1_state),
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.digestsize = SHA1_DIGEST_SIZE,
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.base = {
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.cra_name = "sha1",
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.cra_driver_name = "sha1-ce",
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.cra_priority = 200,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha1_ce_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit sha1_ce_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_cpu_feature_match(SHA1, sha1_ce_mod_init);
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module_exit(sha1_ce_mod_fini);
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