This is a combination of the the Intel algorithm implemented using SSE
and PCLMULQDQ instructions from arch/x86/crypto/crc32-pclmul_asm.S, and
the new CRC32 extensions introduced for both 32-bit and 64-bit ARM in
version 8 of the architecture.
The PMULL/NEON algorithm is faster, but operates on blocks of at least
64 bytes, and on multiples of 16 bytes only. For the remaining input,
or for all input on systems that lack the PMULL 64x64->128 instructions,
the CRC32 instructions will be used.
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
---
arch/arm64/crypto/Kconfig | 6 +
arch/arm64/crypto/Makefile | 3 +
arch/arm64/crypto/crc32-ce-core.S | 246 ++++++++++++++++++++
arch/arm64/crypto/crc32-ce-glue.c | 124 ++++++++++
4 files changed, 379 insertions(+)
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 1b50671ffec3..11dc2ac1f2e5 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -58,4 +58,10 @@ config CRYPTO_CRC32_ARM64
tristate "CRC32 and CRC32C using optional ARMv8 instructions"
depends on ARM64
select CRYPTO_HASH
+
+config CRYPTO_CRC32_ARM64_CE
+ tristate "CRC32 digest algorithm using PMULL instructions"
+ depends on ARM64 && KERNEL_MODE_NEON
+ select CRYPTO_HASH
+
endif
diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index 36fd3eb4201b..144387805a46 100644
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -20,6 +20,9 @@ ghash-ce-y := ghash-ce-glue.o ghash-ce-core.o
obj-$(CONFIG_CRYPTO_CRCT10DIF_ARM64_CE) += crct10dif-ce.o
crct10dif-ce-y := crct10dif-ce-core.o crct10dif-ce-glue.o
+obj-$(CONFIG_CRYPTO_CRC32_ARM64_CE) += crc32-ce.o
+crc32-ce-y:= crc32-ce-core.o crc32-ce-glue.o
+
obj-$(CONFIG_CRYPTO_AES_ARM64_CE) += aes-ce-cipher.o
CFLAGS_aes-ce-cipher.o += -march=armv8-a+crypto
diff --git a/arch/arm64/crypto/crc32-ce-core.S
b/arch/arm64/crypto/crc32-ce-core.S
new file mode 100644
index 000000000000..eff7fe100dab
--- /dev/null
+++ b/arch/arm64/crypto/crc32-ce-core.S
@@ -0,0 +1,246 @@
+/*
+ * Accelerated CRC32 using arm64 CRC, NEON and Crypto Extensions instructions
+ *
+ * Copyright (C) 2016 Linaro Ltd <ard.biesheu...@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see http://www.gnu.org/licenses
+ *
+ * Please visit http://www.xyratex.com/contact if you need additional
+ * information or have any questions.
+ *
+ * GPL HEADER END
+ */
+
+/*
+ * Copyright 2012 Xyratex Technology Limited
+ *
+ * Using hardware provided PCLMULQDQ instruction to accelerate the CRC32
+ * calculation.
+ * CRC32 polynomial:0x04c11db7(BE)/0xEDB88320(LE)
+ * PCLMULQDQ is a new instruction in Intel SSE4.2, the reference can be found
+ * at:
+ * http://www.intel.com/products/processor/manuals/
+ * Intel(R) 64 and IA-32 Architectures Software Developer's Manual
+ * Volume 2B: Instruction Set Reference, N-Z
+ *
+ * Authors: Gregory Prestas <gregory_pres...@us.xyratex.com>
+ * Alexander Boyko <alexander_bo...@xyratex.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+
+ .text
+ .align 4
+ .cpu generic+crypto+crc
+
+ /*
+ * [x4*128+32 mod P(x) << 32)]' << 1 = 0x154442bd4
+ * #define CONSTANT_R1 0x154442bd4LL
+ *
+ * [(x4*128-32 mod P(x) << 32)]' << 1 = 0x1c6e41596
+ * #define CONSTANT_R2 0x1c6e41596LL
+ */
+.Lconstant_R2R1:
+ .octa 0x00000001c6e415960000000154442bd4
+
+ /*
+ * [(x128+32 mod P(x) << 32)]' << 1 = 0x1751997d0
+ * #define CONSTANT_R3 0x1751997d0LL
+ *
+ * [(x128-32 mod P(x) << 32)]' << 1 = 0x0ccaa009e
+ * #define CONSTANT_R4 0x0ccaa009eLL
+ */
+.Lconstant_R4R3:
+ .octa 0x00000000ccaa009e00000001751997d0
+
+ /*
+ * [(x64 mod P(x) << 32)]' << 1 = 0x163cd6124
+ * #define CONSTANT_R5 0x163cd6124LL
+ */
+.Lconstant_R5:
+ .octa 0x00000000000000000000000163cd6124
+.Lconstant_mask32:
+ .octa 0x000000000000000000000000FFFFFFFF
+
+ /*
+ * #define CRCPOLY_TRUE_LE_FULL 0x1DB710641LL
+ *
+ * Barrett Reduction constant (u64`) = u` = (x**64 / P(x))`
+ * = 0x1F7011641LL
+ * #define CONSTANT_RU 0x1F7011641LL
+ */
+.Lconstant_RUpoly:
+ .octa 0x00000001F701164100000001DB710641
+
+ vCONSTANT .req v0
+ dCONSTANT .req d0
+ qCONSTANT .req q0
+
+ BUF .req x0
+ LEN .req x1
+ CRC .req x2
+
+ vzr .req v9
+
+ /**
+ * Calculate crc32
+ * BUF - buffer
+ * LEN - sizeof buffer (multiple of 16 bytes), LEN should be > 63
+ * CRC - initial crc32
+ * return %eax crc32
+ * uint crc32_pmull_le(unsigned char const *buffer,
+ * size_t len, uint crc32)
+ */
+ENTRY(crc32_pmull_le)
+ bic LEN, LEN, #15
+ ld1 {v1.16b-v4.16b}, [BUF], #0x40
+ movi vzr.16b, #0
+ fmov dCONSTANT, CRC
+ eor v1.16b, v1.16b, vCONSTANT.16b
+ sub LEN, LEN, #0x40
+ cmp LEN, #0x40
+ b.lt less_64
+
+ ldr qCONSTANT, .Lconstant_R2R1
+
+loop_64: /* 64 bytes Full cache line folding */
+ sub LEN, LEN, #0x40
+
+ pmull2 v5.1q, v1.2d, vCONSTANT.2d
+ pmull2 v6.1q, v2.2d, vCONSTANT.2d
+ pmull2 v7.1q, v3.2d, vCONSTANT.2d
+ pmull2 v8.1q, v4.2d, vCONSTANT.2d
+
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ pmull v2.1q, v2.1d, vCONSTANT.1d
+ pmull v3.1q, v3.1d, vCONSTANT.1d
+ pmull v4.1q, v4.1d, vCONSTANT.1d
+
+ eor v1.16b, v1.16b, v5.16b
+ ld1 {v5.16b}, [BUF], #0x10
+ eor v2.16b, v2.16b, v6.16b
+ ld1 {v6.16b}, [BUF], #0x10
+ eor v3.16b, v3.16b, v7.16b
+ ld1 {v7.16b}, [BUF], #0x10
+ eor v4.16b, v4.16b, v8.16b
+ ld1 {v8.16b}, [BUF], #0x10
+
+ eor v1.16b, v1.16b, v5.16b
+ eor v2.16b, v2.16b, v6.16b
+ eor v3.16b, v3.16b, v7.16b
+ eor v4.16b, v4.16b, v8.16b
+
+ cmp LEN, #0x40
+ b.ge loop_64
+
+less_64: /* Folding cache line into 128bit */
+ ldr qCONSTANT, .Lconstant_R4R3
+
+ pmull2 v5.1q, v1.2d, vCONSTANT.2d
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v5.16b
+ eor v1.16b, v1.16b, v2.16b
+
+ pmull2 v5.1q, v1.2d, vCONSTANT.2d
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v5.16b
+ eor v1.16b, v1.16b, v3.16b
+
+ pmull2 v5.1q, v1.2d, vCONSTANT.2d
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v5.16b
+ eor v1.16b, v1.16b, v4.16b
+
+ cbz LEN, fold_64
+
+loop_16: /* Folding rest buffer into 128bit */
+ subs LEN, LEN, #0x10
+
+ ld1 {v2.16b}, [BUF], #0x10
+ pmull2 v5.1q, v1.2d, vCONSTANT.2d
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v5.16b
+ eor v1.16b, v1.16b, v2.16b
+
+ b.ne loop_16
+
+fold_64:
+ /* perform the last 64 bit fold, also adds 32 zeroes
+ * to the input stream */
+ ext v2.16b, v1.16b, v1.16b, #8
+ pmull2 v2.1q, v2.2d, vCONSTANT.2d
+ ext v1.16b, v1.16b, vzr.16b, #8
+ eor v1.16b, v1.16b, v2.16b
+
+ /* final 32-bit fold */
+ ldr qCONSTANT, .Lconstant_R5
+ ldr q3, .Lconstant_mask32
+
+ ext v2.16b, v1.16b, vzr.16b, #4
+ and v1.16b, v1.16b, v3.16b
+ pmull v1.1q, v1.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v2.16b
+
+ /* Finish up with the bit-reversed barrett reduction 64 ==> 32 bits */
+ ldr qCONSTANT, .Lconstant_RUpoly
+
+ and v2.16b, v1.16b, v3.16b
+ ext v2.16b, vzr.16b, v2.16b, #8
+ pmull2 v2.1q, v2.2d, vCONSTANT.2d
+ and v2.16b, v2.16b, v3.16b
+ pmull v2.1q, v2.1d, vCONSTANT.1d
+ eor v1.16b, v1.16b, v2.16b
+ mov w0, v1.s[1]
+
+ ret
+ENDPROC(crc32_pmull_le)
+
+ENTRY(crc32_armv8_le)
+0: subs x2, x2, #16
+ b.mi 8f
+ ldp x3, x4, [x1], #16
+CPU_BE( rev x3, x3 )
+CPU_BE( rev x4, x4 )
+ crc32x w0, w0, x3
+ crc32x w0, w0, x4
+ b 0b
+
+8: tbz x2, #3, 4f
+ ldr x3, [x1], #8
+CPU_BE( rev x3, x3 )
+ crc32x w0, w0, x3
+4: tbz x2, #2, 2f
+ ldr w3, [x1], #4
+CPU_BE( rev w3, w3 )
+ crc32w w0, w0, w3
+2: tbz x2, #1, 1f
+ ldrh w3, [x1], #2
+CPU_BE( rev16 w3, w3 )
+ crc32h w0, w0, w3
+1: tbz x2, #0, 0f
+ ldrb w3, [x1]
+ crc32b w0, w0, w3
+0: ret
+ENDPROC(crc32_armv8_le)
diff --git a/arch/arm64/crypto/crc32-ce-glue.c
b/arch/arm64/crypto/crc32-ce-glue.c
new file mode 100644
index 000000000000..567203f29ac6
--- /dev/null
+++ b/arch/arm64/crypto/crc32-ce-glue.c
@@ -0,0 +1,124 @@
+/*
+ * Accelerated CRC32 using arm64 NEON and Crypto Extensions instructions
+ *
+ * Copyright (C) 2016 Linaro Ltd <ard.biesheu...@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/cpufeature.h>
+#include <linux/crc32.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <crypto/internal/hash.h>
+
+#include <asm/hwcap.h>
+#include <asm/neon.h>
+#include <asm/unaligned.h>
+
+#define PMULL_MIN_LEN 64L /* minimum size of buffer
+ * for crc32_pmull_le_16 */
+#define SCALE_F 16L /* size of NEON register */
+
+asmlinkage u32 crc32_pmull_le(const u8 buf[], u64 len, u32 init_crc);
+asmlinkage u32 crc32_armv8_le(u32 init_crc, const u8 buf[], u64 len);
+
+static int crc32_pmull_cra_init(struct crypto_tfm *tfm)
+{
+ u32 *key = crypto_tfm_ctx(tfm);
+
+ *key = 0;
+ return 0;
+}
+
+static int crc32_pmull_setkey(struct crypto_shash *hash, const u8 *key,
+ unsigned int keylen)
+{
+ u32 *mctx = crypto_shash_ctx(hash);
+
+ if (keylen != sizeof(u32)) {
+ crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+ *mctx = le32_to_cpup((__le32 *)key);
+ return 0;
+}
+
+static int crc32_pmull_init(struct shash_desc *desc)
+{
+ u32 *mctx = crypto_shash_ctx(desc->tfm);
+ u32 *crc = shash_desc_ctx(desc);
+
+ *crc = *mctx;
+ return 0;
+}
+
+static int crc32_pmull_update(struct shash_desc *desc, const u8 *data,
+ unsigned int length)
+{
+ u32 *crc = shash_desc_ctx(desc);
+
+ if (length >= PMULL_MIN_LEN) {
+ kernel_neon_begin_partial(10);
+ *crc = crc32_pmull_le(data, round_down(length, SCALE_F), *crc);
+ kernel_neon_end();
+
+ data += round_down(length, SCALE_F);
+ length %= SCALE_F;
+ }
+
+ if (length > 0) {
+ if (elf_hwcap & HWCAP_CRC32)
+ *crc = crc32_armv8_le(*crc, data, length);
+ else
+ *crc = crc32_le(*crc, data, length);
+ }
+
+ return 0;
+}
+
+static int crc32_pmull_final(struct shash_desc *desc, u8 *out)
+{
+ u32 *crc = shash_desc_ctx(desc);
+
+ put_unaligned_le32(*crc, out);
+ return 0;
+}
+
+static struct shash_alg crc32_pmull_alg = {
+ .setkey = crc32_pmull_setkey,
+ .init = crc32_pmull_init,
+ .update = crc32_pmull_update,
+ .final = crc32_pmull_final,
+ .descsize = sizeof(u32),
+ .digestsize = sizeof(u32),
+
+ .base.cra_ctxsize = sizeof(u32),
+ .base.cra_init = crc32_pmull_cra_init,
+ .base.cra_name = "crc32",
+ .base.cra_driver_name = "crc32-arm64-ce",
+ .base.cra_priority = 200,
+ .base.cra_blocksize = 1,
+ .base.cra_module = THIS_MODULE,
+};
+
+static int __init crc32_pmull_mod_init(void)
+{
+ return crypto_register_shash(&crc32_pmull_alg);
+}
+
+static void __exit crc32_pmull_mod_exit(void)
+{
+ crypto_unregister_shash(&crc32_pmull_alg);
+}
+
+module_cpu_feature_match(PMULL, crc32_pmull_mod_init);
+module_exit(crc32_pmull_mod_exit);
+
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheu...@linaro.org>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
--
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