1 files changed, 36 insertions, 0 deletions
diff --git a/lib/crc/arm/crc64.h b/lib/crc/arm/crc64.h
new file mode 100644
index 000000000..de274288a
--- /dev/null
+++ b/lib/crc/arm/crc64.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * CRC64 using ARM PMULL instructions
+ */
+
+#include <asm/simd.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pmull);
+
+u64 crc64_nvme_neon(u64 crc, const u8 *p, size_t len);
+
+#define crc64_be_arch crc64_be_generic
+
+static inline u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
+{
+	if (len >= 128 && static_branch_likely(&have_pmull) &&
+	    likely(may_use_simd())) {
+		do {
+			size_t chunk = min_t(size_t, len & ~15, SZ_4K);
+
+			scoped_ksimd()
+				crc = crc64_nvme_neon(crc, p, chunk);
+
+			p += chunk;
+			len -= chunk;
+		} while (len >= 128);
+	}
+	return crc64_nvme_generic(crc, p, len);
+}
+
+#define crc64_mod_init_arch crc64_mod_init_arch
+static void crc64_mod_init_arch(void)
+{
+	if (elf_hwcap2 & HWCAP2_PMULL)
+		static_branch_enable(&have_pmull);
+}