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-rw-r--r--arch/arm/include/asm/xor.h73
-rw-r--r--arch/arm/lib/Makefile6
-rw-r--r--arch/arm/lib/xor-neon.c42
3 files changed, 121 insertions, 0 deletions
diff --git a/arch/arm/include/asm/xor.h b/arch/arm/include/asm/xor.h
index 7604673dc427..4ffb26d4cad8 100644
--- a/arch/arm/include/asm/xor.h
+++ b/arch/arm/include/asm/xor.h
@@ -7,7 +7,10 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+#include <linux/hardirq.h>
#include <asm-generic/xor.h>
+#include <asm/hwcap.h>
+#include <asm/neon.h>
#define __XOR(a1, a2) a1 ^= a2
@@ -138,4 +141,74 @@ static struct xor_block_template xor_block_arm4regs = {
xor_speed(&xor_block_arm4regs); \
xor_speed(&xor_block_8regs); \
xor_speed(&xor_block_32regs); \
+ NEON_TEMPLATES; \
} while (0)
+
+#ifdef CONFIG_KERNEL_MODE_NEON
+
+extern struct xor_block_template const xor_block_neon_inner;
+
+static void
+xor_neon_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
+{
+ if (in_interrupt()) {
+ xor_arm4regs_2(bytes, p1, p2);
+ } else {
+ kernel_neon_begin();
+ xor_block_neon_inner.do_2(bytes, p1, p2);
+ kernel_neon_end();
+ }
+}
+
+static void
+xor_neon_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+ unsigned long *p3)
+{
+ if (in_interrupt()) {
+ xor_arm4regs_3(bytes, p1, p2, p3);
+ } else {
+ kernel_neon_begin();
+ xor_block_neon_inner.do_3(bytes, p1, p2, p3);
+ kernel_neon_end();
+ }
+}
+
+static void
+xor_neon_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+ unsigned long *p3, unsigned long *p4)
+{
+ if (in_interrupt()) {
+ xor_arm4regs_4(bytes, p1, p2, p3, p4);
+ } else {
+ kernel_neon_begin();
+ xor_block_neon_inner.do_4(bytes, p1, p2, p3, p4);
+ kernel_neon_end();
+ }
+}
+
+static void
+xor_neon_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+ unsigned long *p3, unsigned long *p4, unsigned long *p5)
+{
+ if (in_interrupt()) {
+ xor_arm4regs_5(bytes, p1, p2, p3, p4, p5);
+ } else {
+ kernel_neon_begin();
+ xor_block_neon_inner.do_5(bytes, p1, p2, p3, p4, p5);
+ kernel_neon_end();
+ }
+}
+
+static struct xor_block_template xor_block_neon = {
+ .name = "neon",
+ .do_2 = xor_neon_2,
+ .do_3 = xor_neon_3,
+ .do_4 = xor_neon_4,
+ .do_5 = xor_neon_5
+};
+
+#define NEON_TEMPLATES \
+ do { if (cpu_has_neon()) xor_speed(&xor_block_neon); } while (0)
+#else
+#define NEON_TEMPLATES
+#endif
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index af72969820b4..aaf3a8731136 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -45,3 +45,9 @@ lib-$(CONFIG_ARCH_SHARK) += io-shark.o
$(obj)/csumpartialcopy.o: $(obj)/csumpartialcopygeneric.S
$(obj)/csumpartialcopyuser.o: $(obj)/csumpartialcopygeneric.S
+
+ifeq ($(CONFIG_KERNEL_MODE_NEON),y)
+ NEON_FLAGS := -mfloat-abi=softfp -mfpu=neon
+ CFLAGS_xor-neon.o += $(NEON_FLAGS)
+ lib-$(CONFIG_XOR_BLOCKS) += xor-neon.o
+endif
diff --git a/arch/arm/lib/xor-neon.c b/arch/arm/lib/xor-neon.c
new file mode 100644
index 000000000000..f485e5a2af4b
--- /dev/null
+++ b/arch/arm/lib/xor-neon.c
@@ -0,0 +1,42 @@
+/*
+ * linux/arch/arm/lib/xor-neon.c
+ *
+ * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@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/raid/xor.h>
+
+#ifndef __ARM_NEON__
+#error You should compile this file with '-mfloat-abi=softfp -mfpu=neon'
+#endif
+
+/*
+ * Pull in the reference implementations while instructing GCC (through
+ * -ftree-vectorize) to attempt to exploit implicit parallelism and emit
+ * NEON instructions.
+ */
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#pragma GCC optimize "tree-vectorize"
+#else
+/*
+ * While older versions of GCC do not generate incorrect code, they fail to
+ * recognize the parallel nature of these functions, and emit plain ARM code,
+ * which is known to be slower than the optimized ARM code in asm-arm/xor.h.
+ */
+#warning This code requires at least version 4.6 of GCC
+#endif
+
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#include <asm-generic/xor.h>
+
+struct xor_block_template const xor_block_neon_inner = {
+ .name = "__inner_neon__",
+ .do_2 = xor_8regs_2,
+ .do_3 = xor_8regs_3,
+ .do_4 = xor_8regs_4,
+ .do_5 = xor_8regs_5,
+};