xref: /linux/lib/raid/xor/x86/xor-avx.c (revision 440d6635b20037bc9ad46b20817d7b61cef0fc1b)

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Optimized XOR parity functions for AVX
 *
 * Copyright (C) 2012 Intel Corporation
 * Author: Jim Kukunas <james.t.kukunas@linux.intel.com>
 *
 * Based on Ingo Molnar and Zach Brown's respective MMX and SSE routines
 */
#include <linux/compiler.h>
#include <asm/fpu/api.h>
#include "xor_impl.h"
#include "xor_arch.h"

#define BLOCK4(i) \
		BLOCK(32 * i, 0) \
		BLOCK(32 * (i + 1), 1) \
		BLOCK(32 * (i + 2), 2) \
		BLOCK(32 * (i + 3), 3)

#define BLOCK16() \
		BLOCK4(0) \
		BLOCK4(4) \
		BLOCK4(8) \
		BLOCK4(12)

static void xor_avx_2(unsigned long bytes, unsigned long * __restrict p0,
		      const unsigned long * __restrict p1)
{
	unsigned long lines = bytes >> 9;

	while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
	asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p1[i / sizeof(*p1)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm"  #reg : : \
		"m" (p0[i / sizeof(*p0)])); \
	asm volatile("vmovdqa %%ymm" #reg ", %0" : \
		"=m" (p0[i / sizeof(*p0)])); \
} while (0);

		BLOCK16()

		p0 = (unsigned long *)((uintptr_t)p0 + 512);
		p1 = (unsigned long *)((uintptr_t)p1 + 512);
	}
}

static void xor_avx_3(unsigned long bytes, unsigned long * __restrict p0,
		      const unsigned long * __restrict p1,
		      const unsigned long * __restrict p2)
{
	unsigned long lines = bytes >> 9;

	while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
	asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p2[i / sizeof(*p2)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p1[i / sizeof(*p1)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p0[i / sizeof(*p0)])); \
	asm volatile("vmovdqa %%ymm" #reg ", %0" : \
		"=m" (p0[i / sizeof(*p0)])); \
} while (0);

		BLOCK16()

		p0 = (unsigned long *)((uintptr_t)p0 + 512);
		p1 = (unsigned long *)((uintptr_t)p1 + 512);
		p2 = (unsigned long *)((uintptr_t)p2 + 512);
	}
}

static void xor_avx_4(unsigned long bytes, unsigned long * __restrict p0,
		      const unsigned long * __restrict p1,
		      const unsigned long * __restrict p2,
		      const unsigned long * __restrict p3)
{
	unsigned long lines = bytes >> 9;

	while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
	asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p3[i / sizeof(*p3)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p2[i / sizeof(*p2)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p1[i / sizeof(*p1)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p0[i / sizeof(*p0)])); \
	asm volatile("vmovdqa %%ymm" #reg ", %0" : \
		"=m" (p0[i / sizeof(*p0)])); \
} while (0);

		BLOCK16();

		p0 = (unsigned long *)((uintptr_t)p0 + 512);
		p1 = (unsigned long *)((uintptr_t)p1 + 512);
		p2 = (unsigned long *)((uintptr_t)p2 + 512);
		p3 = (unsigned long *)((uintptr_t)p3 + 512);
	}
}

static void xor_avx_5(unsigned long bytes, unsigned long * __restrict p0,
	     const unsigned long * __restrict p1,
	     const unsigned long * __restrict p2,
	     const unsigned long * __restrict p3,
	     const unsigned long * __restrict p4)
{
	unsigned long lines = bytes >> 9;

	while (lines--) {
#undef BLOCK
#define BLOCK(i, reg) \
do { \
	asm volatile("vmovdqa %0, %%ymm" #reg : : "m" (p4[i / sizeof(*p4)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p3[i / sizeof(*p3)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p2[i / sizeof(*p2)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p1[i / sizeof(*p1)])); \
	asm volatile("vxorps %0, %%ymm" #reg ", %%ymm" #reg : : \
		"m" (p0[i / sizeof(*p0)])); \
	asm volatile("vmovdqa %%ymm" #reg ", %0" : \
		"=m" (p0[i / sizeof(*p0)])); \
} while (0);

		BLOCK16()

		p0 = (unsigned long *)((uintptr_t)p0 + 512);
		p1 = (unsigned long *)((uintptr_t)p1 + 512);
		p2 = (unsigned long *)((uintptr_t)p2 + 512);
		p3 = (unsigned long *)((uintptr_t)p3 + 512);
		p4 = (unsigned long *)((uintptr_t)p4 + 512);
	}
}

DO_XOR_BLOCKS(avx_inner, xor_avx_2, xor_avx_3, xor_avx_4, xor_avx_5);

static void xor_gen_avx(void *dest, void **srcs, unsigned int src_cnt,
			unsigned int bytes)
{
	kernel_fpu_begin();
	xor_gen_avx_inner(dest, srcs, src_cnt, bytes);
	kernel_fpu_end();
}

struct xor_block_template xor_block_avx = {
	.name		= "avx",
	.xor_gen	= xor_gen_avx,
};