[PATCH 15/25] riscv: move the XOR code to lib/raid/

Christoph Hellwig
2026-02-26T15:13:17Z

Move the optimized XOR into lib/raid and include it it in xor.ko
instead of always building it into the main kernel image.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/riscv/include/asm/xor.h | 54 +------------------
arch/riscv/lib/Makefile | 1 -
lib/raid/xor/Makefile | 1 +
lib/raid/xor/riscv/xor-glue.c | 56 ++++++++++++++++++++
{arch/riscv/lib => lib/raid/xor/riscv}/xor.S | 0
5 files changed, 59 insertions(+), 53 deletions(-)
create mode 100644 lib/raid/xor/riscv/xor-glue.c
rename {arch/riscv/lib => lib/raid/xor/riscv}/xor.S (100%)

diff --git a/arch/riscv/include/asm/xor.h b/arch/riscv/include/asm/xor.h
index ed5f27903efc..614d9209d078 100644
--- a/arch/riscv/include/asm/xor.h
+++ b/arch/riscv/include/asm/xor.h
@@ -2,60 +2,10 @@
/*
* Copyright (C) 2021 SiFive
*/
-
-#include <linux/hardirq.h>
-#include <asm-generic/xor.h>
-#ifdef CONFIG_RISCV_ISA_V
#include <asm/vector.h>
-#include <asm/switch_to.h>
-#include <asm/asm-prototypes.h>
-
-static void xor_vector_2(unsigned long bytes, unsigned long *__restrict p1,
- const unsigned long *__restrict p2)
-{
- kernel_vector_begin();
- xor_regs_2_(bytes, p1, p2);
- kernel_vector_end();
-}
-
-static void xor_vector_3(unsigned long bytes, unsigned long *__restrict p1,
- const unsigned long *__restrict p2,
- const unsigned long *__restrict p3)
-{
- kernel_vector_begin();
- xor_regs_3_(bytes, p1, p2, p3);
- kernel_vector_end();
-}
-
-static void xor_vector_4(unsigned long bytes, unsigned long *__restrict p1,
- const unsigned long *__restrict p2,
- const unsigned long *__restrict p3,
- const unsigned long *__restrict p4)
-{
- kernel_vector_begin();
- xor_regs_4_(bytes, p1, p2, p3, p4);
- kernel_vector_end();
-}
-
-static void xor_vector_5(unsigned long bytes, unsigned long *__restrict p1,
- const unsigned long *__restrict p2,
- const unsigned long *__restrict p3,
- const unsigned long *__restrict p4,
- const unsigned long *__restrict p5)
-{
- kernel_vector_begin();
- xor_regs_5_(bytes, p1, p2, p3, p4, p5);
- kernel_vector_end();
-}
+#include <asm-generic/xor.h>

-static struct xor_block_template xor_block_rvv = {
- .name = "rvv",
- .do_2 = xor_vector_2,
- .do_3 = xor_vector_3,
- .do_4 = xor_vector_4,
- .do_5 = xor_vector_5
-};
-#endif /* CONFIG_RISCV_ISA_V */
+extern struct xor_block_template xor_block_rvv;

#define arch_xor_init arch_xor_init
static __always_inline void __init arch_xor_init(void)
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index bbc031124974..e220c35764eb 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -16,5 +16,4 @@ lib-$(CONFIG_MMU) += uaccess.o
lib-$(CONFIG_64BIT) += tishift.o
lib-$(CONFIG_RISCV_ISA_ZICBOZ) += clear_page.o
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
-lib-$(CONFIG_RISCV_ISA_V) += xor.o
lib-$(CONFIG_RISCV_ISA_V) += riscv_v_helpers.o
diff --git a/lib/raid/xor/Makefile b/lib/raid/xor/Makefile
index 3df9e04a1a9b..c939fad43735 100644
--- a/lib/raid/xor/Makefile
+++ b/lib/raid/xor/Makefile
@@ -18,6 +18,7 @@ endif
xor-$(CONFIG_CPU_HAS_LSX) += loongarch/xor_simd.o
xor-$(CONFIG_CPU_HAS_LSX) += loongarch/xor_simd_glue.o
xor-$(CONFIG_ALTIVEC) += powerpc/xor_vmx.o powerpc/xor_vmx_glue.o
+xor-$(CONFIG_RISCV_ISA_V) += riscv/xor.o riscv/xor-glue.o

CFLAGS_arm/xor-neon.o += $(CC_FLAGS_FPU)
diff --git a/lib/raid/xor/riscv/xor-glue.c b/lib/raid/xor/riscv/xor-glue.c
new file mode 100644
index 000000000000..11666a4b6b68
--- /dev/null
+++ b/lib/raid/xor/riscv/xor-glue.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 SiFive
+ */
+
+#include <linux/raid/xor_impl.h>
+#include <asm/vector.h>
+#include <asm/switch_to.h>
+#include <asm/asm-prototypes.h>
+#include <asm/xor.h>
+
+static void xor_vector_2(unsigned long bytes, unsigned long *__restrict p1,
+ const unsigned long *__restrict p2)
+{
+ kernel_vector_begin();
+ xor_regs_2_(bytes, p1, p2);
+ kernel_vector_end();
+}
+
+static void xor_vector_3(unsigned long bytes, unsigned long *__restrict p1,
+ const unsigned long *__restrict p2,
+ const unsigned long *__restrict p3)
+{
+ kernel_vector_begin();
+ xor_regs_3_(bytes, p1, p2, p3);
+ kernel_vector_end();
+}
+
+static void xor_vector_4(unsigned long bytes, unsigned long *__restrict p1,
+ const unsigned long *__restrict p2,
+ const unsigned long *__restrict p3,
+ const unsigned long *__restrict p4)
+{
+ kernel_vector_begin();
+ xor_regs_4_(bytes, p1, p2, p3, p4);
+ kernel_vector_end();
+}
+
+static void xor_vector_5(unsigned long bytes, unsigned long *__restrict p1,
+ const unsigned long *__restrict p2,
+ const unsigned long *__restrict p3,
+ const unsigned long *__restrict p4,
+ const unsigned long *__restrict p5)
+{
+ kernel_vector_begin();
+ xor_regs_5_(bytes, p1, p2, p3, p4, p5);
+ kernel_vector_end();
+}
+
+struct xor_block_template xor_block_rvv = {
+ .name = "rvv",
+ .do_2 = xor_vector_2,
+ .do_3 = xor_vector_3,
+ .do_4 = xor_vector_4,
+ .do_5 = xor_vector_5
+};
diff --git a/arch/riscv/lib/xor.S b/lib/raid/xor/riscv/xor.S
similarity index 100%
rename from arch/riscv/lib/xor.S
rename to lib/raid/xor/riscv/xor.S
--
2.47.3