1 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm64/lib/crc-t10dif-glue.c b/arch/arm64/lib/crc-t10dif-glue.c
new file mode 100644
index 000000000000..dab7e3796232
--- /dev/null
+++ b/arch/arm64/lib/crc-t10dif-glue.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
+ *
+ * Copyright (C) 2016 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/cpufeature.h>
+#include <linux/crc-t10dif.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <crypto/internal/simd.h>
+
+#include <asm/neon.h>
+#include <asm/simd.h>
+
+static DEFINE_STATIC_KEY_FALSE(have_asimd);
+static DEFINE_STATIC_KEY_FALSE(have_pmull);
+
+#define CRC_T10DIF_PMULL_CHUNK_SIZE	16U
+
+asmlinkage void crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len,
+				    u8 out[16]);
+asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len);
+
+u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
+{
+	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) {
+		if (static_branch_likely(&have_pmull)) {
+			if (crypto_simd_usable()) {
+				kernel_neon_begin();
+				crc = crc_t10dif_pmull_p64(crc, data, length);
+				kernel_neon_end();
+				return crc;
+			}
+		} else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE &&
+			   static_branch_likely(&have_asimd) &&
+			   crypto_simd_usable()) {
+			u8 buf[16];
+
+			kernel_neon_begin();
+			crc_t10dif_pmull_p8(crc, data, length, buf);
+			kernel_neon_end();
+
+			crc = 0;
+			data = buf;
+			length = sizeof(buf);
+		}
+	}
+	return crc_t10dif_generic(crc, data, length);
+}
+EXPORT_SYMBOL(crc_t10dif_arch);
+
+static int __init crc_t10dif_arm64_init(void)
+{
+	if (cpu_have_named_feature(ASIMD)) {
+		static_branch_enable(&have_asimd);
+		if (cpu_have_named_feature(PMULL))
+			static_branch_enable(&have_pmull);
+	}
+	return 0;
+}
+arch_initcall(crc_t10dif_arm64_init);
+
+static void __exit crc_t10dif_arm64_exit(void)
+{
+}
+module_exit(crc_t10dif_arm64_exit);
+
+bool crc_t10dif_is_optimized(void)
+{
+	return static_key_enabled(&have_asimd);
+}
+EXPORT_SYMBOL(crc_t10dif_is_optimized);
+
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_DESCRIPTION("CRC-T10DIF using arm64 NEON and Crypto Extensions");
+MODULE_LICENSE("GPL v2");