crypto: sha - SHA1 transform x86_64 AVX2

This git patch adds x86_64 AVX2 optimization of SHA1
transform to crypto support. The patch has been tested with 3.14.0-rc1
kernel.

On a Haswell desktop, with turbo disabled and all cpus running
at maximum frequency, tcrypt shows AVX2 performance improvement
from 3% for 256 bytes update to 16% for 1024 bytes update over
AVX implementation.

This patch adds sha1_avx2_transform(), the glue, build and
configuration changes needed for AVX2 optimization of
SHA1 transform to crypto support.

sha1-ssse3 is one module which adds the necessary optimization
support (SSSE3/AVX/AVX2) for the low-level SHA1 transform function.
With better optimization support, transform function is overridden
as the case may be. In the case of AVX2, due to performance reasons
across datablock sizes, the AVX or AVX2 transform function is used
at run-time as it suits best. The Makefile change therefore appends
the necessary objects to the linkage. Due to this, the patch merely
appends AVX2 transform to the existing build mix and Kconfig support
and leaves the configuration build support as is.

Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 759 insertions, 9 deletions

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 6ba54d6..61d6e28 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -79,6 +79,9 @@ aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o fpu.o
 aesni-intel-$(CONFIG_64BIT) += aesni-intel_avx-x86_64.o
 ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o
 sha1-ssse3-y := sha1_ssse3_asm.o sha1_ssse3_glue.o
+ifeq ($(avx2_supported),yes)
+sha1-ssse3-y += sha1_avx2_x86_64_asm.o
+endif
 crc32c-intel-y := crc32c-intel_glue.o
 crc32c-intel-$(CONFIG_64BIT) += crc32c-pcl-intel-asm_64.o
 crc32-pclmul-y := crc32-pclmul_asm.o crc32-pclmul_glue.o
diff --git a/arch/x86/crypto/sha1_avx2_x86_64_asm.S b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
new file mode 100644
index 0000000..4f34854
--- /dev/null
+++ b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
@@ -0,0 +1,712 @@
+/*
+ *	Implement fast SHA-1 with AVX2 instructions. (x86_64)
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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 for more details.
+ *
+ * Contact Information:
+ * Ilya Albrekht <ilya.albrekht@intel.com>
+ * Maxim Locktyukhin <maxim.locktyukhin@intel.com>
+ * Ronen Zohar <ronen.zohar@intel.com>
+ * Chandramouli Narayanan <mouli@linux.intel.com>
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ * SHA-1 implementation with Intel(R) AVX2 instruction set extensions.
+ *
+ *This implementation is based on the previous SSSE3 release:
+ *Visit http://software.intel.com/en-us/articles/
+ *and refer to improving-the-performance-of-the-secure-hash-algorithm-1/
+ *
+ *Updates 20-byte SHA-1 record in 'hash' for even number of
+ *'num_blocks' consecutive 64-byte blocks
+ *
+ *extern "C" void sha1_transform_avx2(
+ *	int *hash, const char* input, size_t num_blocks );
+ */
+
+#include <linux/linkage.h>
+
+#define	CTX	%rdi	/* arg1 */
+#define BUF	%rsi	/* arg2 */
+#define CNT	%rdx	/* arg3 */
+
+#define	REG_A	%ecx
+#define	REG_B	%esi
+#define	REG_C	%edi
+#define	REG_D	%eax
+#define	REG_E	%edx
+#define	REG_TB	%ebx
+#define	REG_TA	%r12d
+#define	REG_RA	%rcx
+#define	REG_RB	%rsi
+#define	REG_RC	%rdi
+#define	REG_RD	%rax
+#define	REG_RE	%rdx
+#define	REG_RTA	%r12
+#define	REG_RTB	%rbx
+#define	REG_T1	%ebp
+#define	xmm_mov	vmovups
+#define	avx2_zeroupper	vzeroupper
+#define	RND_F1	1
+#define	RND_F2	2
+#define	RND_F3	3
+
+.macro REGALLOC
+	.set A, REG_A
+	.set B, REG_B
+	.set C, REG_C
+	.set D, REG_D
+	.set E, REG_E
+	.set TB, REG_TB
+	.set TA, REG_TA
+
+	.set RA, REG_RA
+	.set RB, REG_RB
+	.set RC, REG_RC
+	.set RD, REG_RD
+	.set RE, REG_RE
+
+	.set RTA, REG_RTA
+	.set RTB, REG_RTB
+
+	.set T1, REG_T1
+.endm
+
+#define K_BASE		%r8
+#define HASH_PTR	%r9
+#define BUFFER_PTR	%r10
+#define BUFFER_PTR2	%r13
+#define BUFFER_END	%r11
+
+#define PRECALC_BUF	%r14
+#define WK_BUF		%r15
+
+#define W_TMP		%xmm0
+#define WY_TMP		%ymm0
+#define WY_TMP2		%ymm9
+
+# AVX2 variables
+#define WY0		%ymm3
+#define WY4		%ymm5
+#define WY08		%ymm7
+#define WY12		%ymm8
+#define WY16		%ymm12
+#define WY20		%ymm13
+#define WY24		%ymm14
+#define WY28		%ymm15
+
+#define YMM_SHUFB_BSWAP	%ymm10
+
+/*
+ * Keep 2 iterations precalculated at a time:
+ *    - 80 DWORDs per iteration * 2
+ */
+#define W_SIZE		(80*2*2 +16)
+
+#define WK(t)	((((t) % 80) / 4)*32 + ( (t) % 4)*4 + ((t)/80)*16 )(WK_BUF)
+#define PRECALC_WK(t)	((t)*2*2)(PRECALC_BUF)
+
+
+.macro UPDATE_HASH  hash, val
+	add	\hash, \val
+	mov	\val, \hash
+.endm
+
+.macro PRECALC_RESET_WY
+	.set WY_00, WY0
+	.set WY_04, WY4
+	.set WY_08, WY08
+	.set WY_12, WY12
+	.set WY_16, WY16
+	.set WY_20, WY20
+	.set WY_24, WY24
+	.set WY_28, WY28
+	.set WY_32, WY_00
+.endm
+
+.macro PRECALC_ROTATE_WY
+	/* Rotate macros */
+	.set WY_32, WY_28
+	.set WY_28, WY_24
+	.set WY_24, WY_20
+	.set WY_20, WY_16
+	.set WY_16, WY_12
+	.set WY_12, WY_08
+	.set WY_08, WY_04
+	.set WY_04, WY_00
+	.set WY_00, WY_32
+
+	/* Define register aliases */
+	.set WY, WY_00
+	.set WY_minus_04, WY_04
+	.set WY_minus_08, WY_08
+	.set WY_minus_12, WY_12
+	.set WY_minus_16, WY_16
+	.set WY_minus_20, WY_20
+	.set WY_minus_24, WY_24
+	.set WY_minus_28, WY_28
+	.set WY_minus_32, WY
+.endm
+
+.macro PRECALC_00_15
+	.if (i == 0) # Initialize and rotate registers
+		PRECALC_RESET_WY
+		PRECALC_ROTATE_WY
+	.endif
+
+	/* message scheduling pre-compute for rounds 0-15 */
+	.if   ((i & 7) == 0)
+		/*
+		 * blended AVX2 and ALU instruction scheduling
+		 * 1 vector iteration per 8 rounds
+		 */
+		vmovdqu ((i * 2) + PRECALC_OFFSET)(BUFFER_PTR), W_TMP
+	.elseif ((i & 7) == 1)
+		vinsertf128 $1, (((i-1) * 2)+PRECALC_OFFSET)(BUFFER_PTR2),\
+			 WY_TMP, WY_TMP
+	.elseif ((i & 7) == 2)
+		vpshufb YMM_SHUFB_BSWAP, WY_TMP, WY
+	.elseif ((i & 7) == 4)
+		vpaddd  K_XMM(K_BASE), WY, WY_TMP
+	.elseif ((i & 7) == 7)
+		vmovdqu  WY_TMP, PRECALC_WK(i&~7)
+
+		PRECALC_ROTATE_WY
+	.endif
+.endm
+
+.macro PRECALC_16_31
+	/*
+	 * message scheduling pre-compute for rounds 16-31
+	 * calculating last 32 w[i] values in 8 XMM registers
+	 * pre-calculate K+w[i] values and store to mem
+	 * for later load by ALU add instruction
+	 *
+	 * "brute force" vectorization for rounds 16-31 only
+	 * due to w[i]->w[i-3] dependency
+	 */
+	.if   ((i & 7) == 0)
+		/*
+		 * blended AVX2 and ALU instruction scheduling
+		 * 1 vector iteration per 8 rounds
+		 */
+		/* w[i-14] */
+		vpalignr	$8, WY_minus_16, WY_minus_12, WY
+		vpsrldq	$4, WY_minus_04, WY_TMP               /* w[i-3] */
+	.elseif ((i & 7) == 1)
+		vpxor	WY_minus_08, WY, WY
+		vpxor	WY_minus_16, WY_TMP, WY_TMP
+	.elseif ((i & 7) == 2)
+		vpxor	WY_TMP, WY, WY
+		vpslldq	$12, WY, WY_TMP2
+	.elseif ((i & 7) == 3)
+		vpslld	$1, WY, WY_TMP
+		vpsrld	$31, WY, WY
+	.elseif ((i & 7) == 4)
+		vpor	WY, WY_TMP, WY_TMP
+		vpslld	$2, WY_TMP2, WY
+	.elseif ((i & 7) == 5)
+		vpsrld	$30, WY_TMP2, WY_TMP2
+		vpxor	WY, WY_TMP, WY_TMP
+	.elseif ((i & 7) == 7)
+		vpxor	WY_TMP2, WY_TMP, WY
+		vpaddd	K_XMM(K_BASE), WY, WY_TMP
+		vmovdqu	WY_TMP, PRECALC_WK(i&~7)
+
+		PRECALC_ROTATE_WY
+	.endif
+.endm
+
+.macro PRECALC_32_79
+	/*
+	 * in SHA-1 specification:
+	 * w[i] = (w[i-3] ^ w[i-8]  ^ w[i-14] ^ w[i-16]) rol 1
+	 * instead we do equal:
+	 * w[i] = (w[i-6] ^ w[i-16] ^ w[i-28] ^ w[i-32]) rol 2
+	 * allows more efficient vectorization
+	 * since w[i]=>w[i-3] dependency is broken
+	 */
+
+	.if   ((i & 7) == 0)
+	/*
+	 * blended AVX2 and ALU instruction scheduling
+	 * 1 vector iteration per 8 rounds
+	 */
+		vpalignr	$8, WY_minus_08, WY_minus_04, WY_TMP
+	.elseif ((i & 7) == 1)
+		/* W is W_minus_32 before xor */
+		vpxor	WY_minus_28, WY, WY
+	.elseif ((i & 7) == 2)
+		vpxor	WY_minus_16, WY_TMP, WY_TMP
+	.elseif ((i & 7) == 3)
+		vpxor	WY_TMP, WY, WY
+	.elseif ((i & 7) == 4)
+		vpslld	$2, WY, WY_TMP
+	.elseif ((i & 7) == 5)
+		vpsrld	$30, WY, WY
+		vpor	WY, WY_TMP, WY
+	.elseif ((i & 7) == 7)
+		vpaddd	K_XMM(K_BASE), WY, WY_TMP
+		vmovdqu	WY_TMP, PRECALC_WK(i&~7)
+
+		PRECALC_ROTATE_WY
+	.endif
+.endm
+
+.macro PRECALC r, s
+	.set i, \r
+
+	.if (i < 40)
+		.set K_XMM, 32*0
+	.elseif (i < 80)
+		.set K_XMM, 32*1
+	.elseif (i < 120)
+		.set K_XMM, 32*2
+	.else
+		.set K_XMM, 32*3
+	.endif
+
+	.if (i<32)
+		PRECALC_00_15	\s
+	.elseif (i<64)
+		PRECALC_16_31	\s
+	.elseif (i < 160)
+		PRECALC_32_79	\s
+	.endif
+.endm
+
+.macro ROTATE_STATE
+	.set T_REG, E
+	.set E, D
+	.set D, C
+	.set C, B
+	.set B, TB
+	.set TB, A
+	.set A, T_REG
+
+	.set T_REG, RE
+	.set RE, RD
+	.set RD, RC
+	.set RC, RB
+	.set RB, RTB
+	.set RTB, RA
+	.set RA, T_REG
+.endm
+
+/* Macro relies on saved ROUND_Fx */
+
+.macro RND_FUN f, r
+	.if (\f == RND_F1)
+		ROUND_F1	\r
+	.elseif (\f == RND_F2)
+		ROUND_F2	\r
+	.elseif (\f == RND_F3)
+		ROUND_F3	\r
+	.endif
+.endm
+
+.macro RR r
+	.set round_id, (\r % 80)
+
+	.if (round_id == 0)        /* Precalculate F for first round */
+		.set ROUND_FUNC, RND_F1
+		mov	B, TB
+
+		rorx	$(32-30), B, B    /* b>>>2 */
+		andn	D, TB, T1
+		and	C, TB
+		xor	T1, TB
+	.endif
+
+	RND_FUN ROUND_FUNC, \r
+	ROTATE_STATE
+
+	.if   (round_id == 18)
+		.set ROUND_FUNC, RND_F2
+	.elseif (round_id == 38)
+		.set ROUND_FUNC, RND_F3
+	.elseif (round_id == 58)
+		.set ROUND_FUNC, RND_F2
+	.endif
+
+	.set round_id, ( (\r+1) % 80)
+
+	RND_FUN ROUND_FUNC, (\r+1)
+	ROTATE_STATE
+.endm
+
+.macro ROUND_F1 r
+	add	WK(\r), E
+
+	andn	C, A, T1			/* ~b&d */
+	lea	(RE,RTB), E		/* Add F from the previous round */
+
+	rorx	$(32-5), A, TA		/* T2 = A >>> 5 */
+	rorx	$(32-30),A, TB		/* b>>>2 for next round */
+
+	PRECALC	(\r)			/* msg scheduling for next 2 blocks */
+
+	/*
+	 * Calculate F for the next round
+	 * (b & c) ^ andn[b, d]
+	 */
+	and	B, A			/* b&c */
+	xor	T1, A			/* F1 = (b&c) ^ (~b&d) */
+
+	lea	(RE,RTA), E		/* E += A >>> 5 */
+.endm
+
+.macro ROUND_F2 r
+	add	WK(\r), E
+	lea	(RE,RTB), E		/* Add F from the previous round */
+
+	/* Calculate F for the next round */
+	rorx	$(32-5), A, TA		/* T2 = A >>> 5 */
+	.if ((round_id) < 79)
+		rorx	$(32-30), A, TB	/* b>>>2 for next round */
+	.endif
+	PRECALC	(\r)			/* msg scheduling for next 2 blocks */
+
+	.if ((round_id) < 79)
+		xor	B, A
+	.endif
+
+	add	TA, E			/* E += A >>> 5 */
+
+	.if ((round_id) < 79)
+		xor	C, A
+	.endif
+.endm
+
+.macro ROUND_F3 r
+	add	WK(\r), E
+	PRECALC	(\r)			/* msg scheduling for next 2 blocks */
+
+	lea	(RE,RTB), E		/* Add F from the previous round */
+
+	mov	B, T1
+	or	A, T1
+
+	rorx	$(32-5), A, TA		/* T2 = A >>> 5 */
+	rorx	$(32-30), A, TB		/* b>>>2 for next round */
+
+	/* Calculate F for the next round
+	 * (b and c) or (d and (b or c))
+	 */
+	and	C, T1
+	and	B, A
+	or	T1, A
+
+	add	TA, E			/* E += A >>> 5 */
+
+.endm
+
+/*
+ * macro implements 80 rounds of SHA-1, for multiple blocks with s/w pipelining
+ */
+.macro SHA1_PIPELINED_MAIN_BODY
+
+	REGALLOC
+
+	mov	(HASH_PTR), A
+	mov	4(HASH_PTR), B
+	mov	8(HASH_PTR), C
+	mov	12(HASH_PTR), D
+	mov	16(HASH_PTR), E
+
+	mov	%rsp, PRECALC_BUF
+	lea	(2*4*80+32)(%rsp), WK_BUF
+
+	# Precalc WK for first 2 blocks
+	PRECALC_OFFSET = 0
+	.set i, 0
+	.rept    160
+		PRECALC i
+		.set i, i + 1
+	.endr
+	PRECALC_OFFSET = 128
+	xchg	WK_BUF, PRECALC_BUF
+
+	.align 32
+_loop:
+	/*
+	 * code loops through more than one block
+	 * we use K_BASE value as a signal of a last block,
+	 * it is set below by: cmovae BUFFER_PTR, K_BASE
+	 */
+	cmp	K_BASE, BUFFER_PTR
+	jne	_begin
+	.align 32
+	jmp	_end
+	.align 32
+_begin:
+
+	/*
+	 * Do first block
+	 * rounds: 0,2,4,6,8
+	 */
+	.set j, 0
+	.rept 5
+		RR	j
+		.set j, j+2
+	.endr
+
+	jmp _loop0
+_loop0:
+
+	/*
+	 * rounds:
+	 * 10,12,14,16,18
+	 * 20,22,24,26,28
+	 * 30,32,34,36,38
+	 * 40,42,44,46,48
+	 * 50,52,54,56,58
+	 */
+	.rept 25
+		RR	j
+		.set j, j+2
+	.endr
+
+	add	$(2*64), BUFFER_PTR       /* move to next odd-64-byte block */
+	cmp	BUFFER_END, BUFFER_PTR    /* is current block the last one? */
+	cmovae	K_BASE, BUFFER_PTR	/* signal the last iteration smartly */
+
+	/*
+	 * rounds
+	 * 60,62,64,66,68
+	 * 70,72,74,76,78
+	 */
+	.rept 10
+		RR	j
+		.set j, j+2
+	.endr
+
+	UPDATE_HASH	(HASH_PTR), A
+	UPDATE_HASH	4(HASH_PTR), TB
+	UPDATE_HASH	8(HASH_PTR), C
+	UPDATE_HASH	12(HASH_PTR), D
+	UPDATE_HASH	16(HASH_PTR), E
+
+	cmp	K_BASE, BUFFER_PTR	/* is current block the last one? */
+	je	_loop
+
+	mov	TB, B
+
+	/* Process second block */
+	/*
+	 * rounds
+	 *  0+80, 2+80, 4+80, 6+80, 8+80
+	 * 10+80,12+80,14+80,16+80,18+80
+	 */
+
+	.set j, 0
+	.rept 10
+		RR	j+80
+		.set j, j+2
+	.endr
+
+	jmp	_loop1
+_loop1:
+	/*
+	 * rounds
+	 * 20+80,22+80,24+80,26+80,28+80
+	 * 30+80,32+80,34+80,36+80,38+80
+	 */
+	.rept 10
+		RR	j+80
+		.set j, j+2
+	.endr
+
+	jmp	_loop2
+_loop2:
+
+	/*
+	 * rounds
+	 * 40+80,42+80,44+80,46+80,48+80
+	 * 50+80,52+80,54+80,56+80,58+80
+	 */
+	.rept 10
+		RR	j+80
+		.set j, j+2
+	.endr
+
+	add	$(2*64), BUFFER_PTR2      /* move to next even-64-byte block */
+
+	cmp	BUFFER_END, BUFFER_PTR2   /* is current block the last one */
+	cmovae	K_BASE, BUFFER_PTR       /* signal the last iteration smartly */
+
+	jmp	_loop3
+_loop3:
+
+	/*
+	 * rounds
+	 * 60+80,62+80,64+80,66+80,68+80
+	 * 70+80,72+80,74+80,76+80,78+80
+	 */
+	.rept 10
+		RR	j+80
+		.set j, j+2
+	.endr
+
+	UPDATE_HASH	(HASH_PTR), A
+	UPDATE_HASH	4(HASH_PTR), TB
+	UPDATE_HASH	8(HASH_PTR), C
+	UPDATE_HASH	12(HASH_PTR), D
+	UPDATE_HASH	16(HASH_PTR), E
+
+	/* Reset state for AVX2 reg permutation */
+	mov	A, TA
+	mov	TB, A
+	mov	C, TB
+	mov	E, C
+	mov	D, B
+	mov	TA, D
+
+	REGALLOC
+
+	xchg	WK_BUF, PRECALC_BUF
+
+	jmp	_loop
+
+	.align 32
+	_end:
+
+.endm
+/*
+ * macro implements SHA-1 function's body for several 64-byte blocks
+ * param: function's name
+ */
+.macro SHA1_VECTOR_ASM  name
+	ENTRY(\name)
+	.align 4096
+
+	push	%rbx
+	push	%rbp
+	push	%r12
+	push	%r13
+	push	%r14
+	push	%r15
+
+	RESERVE_STACK  = (W_SIZE*4 + 8+24)
+
+	/* Align stack */
+	mov	%rsp, %rbx
+	and	$(0x1000-1), %rbx
+	sub	$(8+32), %rbx
+	sub	%rbx, %rsp
+	push	%rbx
+	sub	$RESERVE_STACK, %rsp
+
+	avx2_zeroupper
+
+	lea	K_XMM_AR(%rip), K_BASE
+
+	mov	CTX, HASH_PTR
+	mov	BUF, BUFFER_PTR
+	lea	64(BUF), BUFFER_PTR2
+
+	shl	$6, CNT			/* mul by 64 */
+	add	BUF, CNT
+	add	$64, CNT
+	mov	CNT, BUFFER_END
+
+	cmp	BUFFER_END, BUFFER_PTR2
+	cmovae	K_BASE, BUFFER_PTR2
+
+	xmm_mov	BSWAP_SHUFB_CTL(%rip), YMM_SHUFB_BSWAP
+
+	SHA1_PIPELINED_MAIN_BODY
+
+	avx2_zeroupper
+
+	add	$RESERVE_STACK, %rsp
+	pop	%rbx
+	add	%rbx, %rsp
+
+	pop	%r15
+	pop	%r14
+	pop	%r13
+	pop	%r12
+	pop	%rbp
+	pop	%rbx
+
+	ret
+
+	ENDPROC(\name)
+.endm
+
+.section .rodata
+
+#define K1 0x5a827999
+#define K2 0x6ed9eba1
+#define K3 0x8f1bbcdc
+#define K4 0xca62c1d6
+
+.align 128
+K_XMM_AR:
+	.long K1, K1, K1, K1
+	.long K1, K1, K1, K1
+	.long K2, K2, K2, K2
+	.long K2, K2, K2, K2
+	.long K3, K3, K3, K3
+	.long K3, K3, K3, K3
+	.long K4, K4, K4, K4
+	.long K4, K4, K4, K4
+
+BSWAP_SHUFB_CTL:
+	.long 0x00010203
+	.long 0x04050607
+	.long 0x08090a0b
+	.long 0x0c0d0e0f
+	.long 0x00010203
+	.long 0x04050607
+	.long 0x08090a0b
+	.long 0x0c0d0e0f
+.text
+
+SHA1_VECTOR_ASM     sha1_transform_avx2
diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 4a11a9d..139a55c 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -10,6 +10,7 @@
  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  * Copyright (c) Mathias Krause <minipli@googlemail.com>
+ * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -39,6 +40,12 @@ asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data,
 asmlinkage void sha1_transform_avx(u32 *digest, const char *data,
 				   unsigned int rounds);
 #endif
+#ifdef CONFIG_AS_AVX2
+#define SHA1_AVX2_BLOCK_OPTSIZE	4	/* optimal 4*64 bytes of SHA1 blocks */
+
+asmlinkage void sha1_transform_avx2(u32 *digest, const char *data,
+				unsigned int rounds);
+#endif
 
 static asmlinkage void (*sha1_transform_asm)(u32 *, const char *, unsigned int);
 
@@ -165,6 +172,18 @@ static int sha1_ssse3_import(struct shash_desc *desc, const void *in)
 	return 0;
 }
 
+#ifdef CONFIG_AS_AVX2
+static void sha1_apply_transform_avx2(u32 *digest, const char *data,
+				unsigned int rounds)
+{
+	/* Select the optimal transform based on data block size */
+	if (rounds >= SHA1_AVX2_BLOCK_OPTSIZE)
+		sha1_transform_avx2(digest, data, rounds);
+	else
+		sha1_transform_avx(digest, data, rounds);
+}
+#endif
+
 static struct shash_alg alg = {
 	.digestsize	=	SHA1_DIGEST_SIZE,
 	.init		=	sha1_ssse3_init,
@@ -189,7 +208,11 @@ static bool __init avx_usable(void)
 {
 	u64 xcr0;
 
+#if defined(CONFIG_AS_AVX2)
+	if (!cpu_has_avx || !cpu_has_avx2 || !cpu_has_osxsave)
+#else
 	if (!cpu_has_avx || !cpu_has_osxsave)
+#endif
 		return false;
 
 	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
@@ -205,23 +228,35 @@ static bool __init avx_usable(void)
 
 static int __init sha1_ssse3_mod_init(void)
 {
+	char *algo_name;
 	/* test for SSSE3 first */
-	if (cpu_has_ssse3)
+	if (cpu_has_ssse3) {
 		sha1_transform_asm = sha1_transform_ssse3;
+		algo_name = "SSSE3";
+	}
 
 #ifdef CONFIG_AS_AVX
 	/* allow AVX to override SSSE3, it's a little faster */
-	if (avx_usable())
-		sha1_transform_asm = sha1_transform_avx;
+	if (avx_usable()) {
+		if (cpu_has_avx) {
+			sha1_transform_asm = sha1_transform_avx;
+			algo_name = "AVX";
+		}
+#ifdef CONFIG_AS_AVX2
+		if (cpu_has_avx2 && boot_cpu_has(X86_FEATURE_BMI2)) {
+			/* allow AVX2 to override AVX, it's a little faster */
+			sha1_transform_asm = sha1_apply_transform_avx2;
+			algo_name = "AVX2";
+		}
+#endif
+	}
 #endif
 
 	if (sha1_transform_asm) {
-		pr_info("Using %s optimized SHA-1 implementation\n",
-		        sha1_transform_asm == sha1_transform_ssse3 ? "SSSE3"
-		                                                   : "AVX");
+		pr_info("Using %s optimized SHA-1 implementation\n", algo_name);
 		return crypto_register_shash(&alg);
 	}
-	pr_info("Neither AVX nor SSSE3 is available/usable.\n");
+	pr_info("Neither AVX nor AVX2 nor SSSE3 is available/usable.\n");
 
 	return -ENODEV;
 }
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 7bcb70d..ce4012a 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -491,14 +491,14 @@ config CRYPTO_SHA1
 	  SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
 
 config CRYPTO_SHA1_SSSE3
-	tristate "SHA1 digest algorithm (SSSE3/AVX)"
+	tristate "SHA1 digest algorithm (SSSE3/AVX/AVX2)"
 	depends on X86 && 64BIT
 	select CRYPTO_SHA1
 	select CRYPTO_HASH
 	help
 	  SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2) implemented
 	  using Supplemental SSE3 (SSSE3) instructions or Advanced Vector
-	  Extensions (AVX), when available.
+	  Extensions (AVX/AVX2), when available.
 
 config CRYPTO_SHA256_SSSE3
 	tristate "SHA256 digest algorithm (SSSE3/AVX/AVX2)"