diff options
Diffstat (limited to 'arch/arm64/crypto/crct10dif-ce-glue.c')
| -rw-r--r-- | arch/arm64/crypto/crct10dif-ce-glue.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/arm64/crypto/crct10dif-ce-glue.c b/arch/arm64/crypto/crct10dif-ce-glue.c new file mode 100644 index 000000000..09eb1456a --- /dev/null +++ b/arch/arm64/crypto/crct10dif-ce-glue.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions + * + * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> + */ + +#include <linux/cpufeature.h> +#include <linux/crc-t10dif.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> + +#include <crypto/internal/hash.h> +#include <crypto/internal/simd.h> + +#include <asm/neon.h> +#include <asm/simd.h> + +#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U + +asmlinkage u16 crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len); +asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len); + +static int crct10dif_init(struct shash_desc *desc) +{ + u16 *crc = shash_desc_ctx(desc); + + *crc = 0; + return 0; +} + +static int crct10dif_update_pmull_p8(struct shash_desc *desc, const u8 *data, + unsigned int length) +{ + u16 *crc = shash_desc_ctx(desc); + + if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { + do { + unsigned int chunk = length; + + if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE) + chunk = SZ_4K; + + kernel_neon_begin(); + *crc = crc_t10dif_pmull_p8(*crc, data, chunk); + kernel_neon_end(); + data += chunk; + length -= chunk; + } while (length); + } else { + *crc = crc_t10dif_generic(*crc, data, length); + } + + return 0; +} + +static int crct10dif_update_pmull_p64(struct shash_desc *desc, const u8 *data, + unsigned int length) +{ + u16 *crc = shash_desc_ctx(desc); + + if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { + do { + unsigned int chunk = length; + + if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE) + chunk = SZ_4K; + + kernel_neon_begin(); + *crc = crc_t10dif_pmull_p64(*crc, data, chunk); + kernel_neon_end(); + data += chunk; + length -= chunk; + } while (length); + } else { + *crc = crc_t10dif_generic(*crc, data, length); + } + + return 0; +} + +static int crct10dif_final(struct shash_desc *desc, u8 *out) +{ + u16 *crc = shash_desc_ctx(desc); + + *(u16 *)out = *crc; + return 0; +} + +static struct shash_alg crc_t10dif_alg[] = {{ + .digestsize = CRC_T10DIF_DIGEST_SIZE, + .init = crct10dif_init, + .update = crct10dif_update_pmull_p8, + .final = crct10dif_final, + .descsize = CRC_T10DIF_DIGEST_SIZE, + + .base.cra_name = "crct10dif", + .base.cra_driver_name = "crct10dif-arm64-neon", + .base.cra_priority = 100, + .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +}, { + .digestsize = CRC_T10DIF_DIGEST_SIZE, + .init = crct10dif_init, + .update = crct10dif_update_pmull_p64, + .final = crct10dif_final, + .descsize = CRC_T10DIF_DIGEST_SIZE, + + .base.cra_name = "crct10dif", + .base.cra_driver_name = "crct10dif-arm64-ce", + .base.cra_priority = 200, + .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, + .base.cra_module = THIS_MODULE, +}}; + +static int __init crc_t10dif_mod_init(void) +{ + if (cpu_have_named_feature(PMULL)) + return crypto_register_shashes(crc_t10dif_alg, + ARRAY_SIZE(crc_t10dif_alg)); + else + /* only register the first array element */ + return crypto_register_shash(crc_t10dif_alg); +} + +static void __exit crc_t10dif_mod_exit(void) +{ + if (cpu_have_named_feature(PMULL)) + crypto_unregister_shashes(crc_t10dif_alg, + ARRAY_SIZE(crc_t10dif_alg)); + else + crypto_unregister_shash(crc_t10dif_alg); +} + +module_cpu_feature_match(ASIMD, crc_t10dif_mod_init); +module_exit(crc_t10dif_mod_exit); + +MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_CRYPTO("crct10dif"); +MODULE_ALIAS_CRYPTO("crct10dif-arm64-ce"); |