Merge v6.17.2linux-rolling-stable

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/crc/riscv/crc32.h b/lib/crc/riscv/crc32.h
new file mode 100644
index 000000000000..3ec6eee98afa
--- /dev/null
+++ b/lib/crc/riscv/crc32.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RISC-V optimized CRC32 functions
+ *
+ * Copyright 2025 Google LLC
+ */
+
+#include <asm/hwcap.h>
+#include <asm/alternative-macros.h>
+
+#include "crc-clmul.h"
+
+static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return crc32_lsb_clmul(crc, p, len,
+				       &crc32_lsb_0xedb88320_consts);
+	return crc32_le_base(crc, p, len);
+}
+
+static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return crc32_msb_clmul(crc, p, len,
+				       &crc32_msb_0x04c11db7_consts);
+	return crc32_be_base(crc, p, len);
+}
+
+static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return crc32_lsb_clmul(crc, p, len,
+				       &crc32_lsb_0x82f63b78_consts);
+	return crc32c_base(crc, p, len);
+}
+
+static inline u32 crc32_optimizations_arch(void)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return CRC32_LE_OPTIMIZATION |
+		       CRC32_BE_OPTIMIZATION |
+		       CRC32C_OPTIMIZATION;
+	return 0;
+}