Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/arch/arm/crypto/crc32-ce-glue.c b/arch/arm/crypto/crc32-ce-glue.c
new file mode 100644
index 000000000..220844580
--- /dev/null
+++ b/arch/arm/crypto/crc32-ce-glue.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Accelerated CRC32(C) using ARM CRC, NEON and Crypto Extensions instructions
+ *
+ * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/cpufeature.h>
+#include <linux/crc32.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <crypto/internal/hash.h>
+#include <crypto/internal/simd.h>
+
+#include <asm/hwcap.h>
+#include <asm/neon.h>
+#include <asm/simd.h>
+#include <asm/unaligned.h>
+
+#define PMULL_MIN_LEN		64L	/* minimum size of buffer
+					 * for crc32_pmull_le_16 */
+#define SCALE_F			16L	/* size of NEON register */
+
+asmlinkage u32 crc32_pmull_le(const u8 buf[], u32 len, u32 init_crc);
+asmlinkage u32 crc32_armv8_le(u32 init_crc, const u8 buf[], u32 len);
+
+asmlinkage u32 crc32c_pmull_le(const u8 buf[], u32 len, u32 init_crc);
+asmlinkage u32 crc32c_armv8_le(u32 init_crc, const u8 buf[], u32 len);
+
+static u32 (*fallback_crc32)(u32 init_crc, const u8 buf[], u32 len);
+static u32 (*fallback_crc32c)(u32 init_crc, const u8 buf[], u32 len);
+
+static int crc32_cra_init(struct crypto_tfm *tfm)
+{
+	u32 *key = crypto_tfm_ctx(tfm);
+
+	*key = 0;
+	return 0;
+}
+
+static int crc32c_cra_init(struct crypto_tfm *tfm)
+{
+	u32 *key = crypto_tfm_ctx(tfm);
+
+	*key = ~0;
+	return 0;
+}
+
+static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
+			unsigned int keylen)
+{
+	u32 *mctx = crypto_shash_ctx(hash);
+
+	if (keylen != sizeof(u32))
+		return -EINVAL;
+	*mctx = le32_to_cpup((__le32 *)key);
+	return 0;
+}
+
+static int crc32_init(struct shash_desc *desc)
+{
+	u32 *mctx = crypto_shash_ctx(desc->tfm);
+	u32 *crc = shash_desc_ctx(desc);
+
+	*crc = *mctx;
+	return 0;
+}
+
+static int crc32_update(struct shash_desc *desc, const u8 *data,
+			unsigned int length)
+{
+	u32 *crc = shash_desc_ctx(desc);
+
+	*crc = crc32_armv8_le(*crc, data, length);
+	return 0;
+}
+
+static int crc32c_update(struct shash_desc *desc, const u8 *data,
+			 unsigned int length)
+{
+	u32 *crc = shash_desc_ctx(desc);
+
+	*crc = crc32c_armv8_le(*crc, data, length);
+	return 0;
+}
+
+static int crc32_final(struct shash_desc *desc, u8 *out)
+{
+	u32 *crc = shash_desc_ctx(desc);
+
+	put_unaligned_le32(*crc, out);
+	return 0;
+}
+
+static int crc32c_final(struct shash_desc *desc, u8 *out)
+{
+	u32 *crc = shash_desc_ctx(desc);
+
+	put_unaligned_le32(~*crc, out);
+	return 0;
+}
+
+static int crc32_pmull_update(struct shash_desc *desc, const u8 *data,
+			      unsigned int length)
+{
+	u32 *crc = shash_desc_ctx(desc);
+	unsigned int l;
+
+	if (crypto_simd_usable()) {
+		if ((u32)data % SCALE_F) {
+			l = min_t(u32, length, SCALE_F - ((u32)data % SCALE_F));
+
+			*crc = fallback_crc32(*crc, data, l);
+
+			data += l;
+			length -= l;
+		}
+
+		if (length >= PMULL_MIN_LEN) {
+			l = round_down(length, SCALE_F);
+
+			kernel_neon_begin();
+			*crc = crc32_pmull_le(data, l, *crc);
+			kernel_neon_end();
+
+			data += l;
+			length -= l;
+		}
+	}
+
+	if (length > 0)
+		*crc = fallback_crc32(*crc, data, length);
+
+	return 0;
+}
+
+static int crc32c_pmull_update(struct shash_desc *desc, const u8 *data,
+			       unsigned int length)
+{
+	u32 *crc = shash_desc_ctx(desc);
+	unsigned int l;
+
+	if (crypto_simd_usable()) {
+		if ((u32)data % SCALE_F) {
+			l = min_t(u32, length, SCALE_F - ((u32)data % SCALE_F));
+
+			*crc = fallback_crc32c(*crc, data, l);
+
+			data += l;
+			length -= l;
+		}
+
+		if (length >= PMULL_MIN_LEN) {
+			l = round_down(length, SCALE_F);
+
+			kernel_neon_begin();
+			*crc = crc32c_pmull_le(data, l, *crc);
+			kernel_neon_end();
+
+			data += l;
+			length -= l;
+		}
+	}
+
+	if (length > 0)
+		*crc = fallback_crc32c(*crc, data, length);
+
+	return 0;
+}
+
+static struct shash_alg crc32_pmull_algs[] = { {
+	.setkey			= crc32_setkey,
+	.init			= crc32_init,
+	.update			= crc32_update,
+	.final			= crc32_final,
+	.descsize		= sizeof(u32),
+	.digestsize		= sizeof(u32),
+
+	.base.cra_ctxsize	= sizeof(u32),
+	.base.cra_init		= crc32_cra_init,
+	.base.cra_name		= "crc32",
+	.base.cra_driver_name	= "crc32-arm-ce",
+	.base.cra_priority	= 200,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= 1,
+	.base.cra_module	= THIS_MODULE,
+}, {
+	.setkey			= crc32_setkey,
+	.init			= crc32_init,
+	.update			= crc32c_update,
+	.final			= crc32c_final,
+	.descsize		= sizeof(u32),
+	.digestsize		= sizeof(u32),
+
+	.base.cra_ctxsize	= sizeof(u32),
+	.base.cra_init		= crc32c_cra_init,
+	.base.cra_name		= "crc32c",
+	.base.cra_driver_name	= "crc32c-arm-ce",
+	.base.cra_priority	= 200,
+	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+	.base.cra_blocksize	= 1,
+	.base.cra_module	= THIS_MODULE,
+} };
+
+static int __init crc32_pmull_mod_init(void)
+{
+	if (elf_hwcap2 & HWCAP2_PMULL) {
+		crc32_pmull_algs[0].update = crc32_pmull_update;
+		crc32_pmull_algs[1].update = crc32c_pmull_update;
+
+		if (elf_hwcap2 & HWCAP2_CRC32) {
+			fallback_crc32 = crc32_armv8_le;
+			fallback_crc32c = crc32c_armv8_le;
+		} else {
+			fallback_crc32 = crc32_le;
+			fallback_crc32c = __crc32c_le;
+		}
+	} else if (!(elf_hwcap2 & HWCAP2_CRC32)) {
+		return -ENODEV;
+	}
+
+	return crypto_register_shashes(crc32_pmull_algs,
+				       ARRAY_SIZE(crc32_pmull_algs));
+}
+
+static void __exit crc32_pmull_mod_exit(void)
+{
+	crypto_unregister_shashes(crc32_pmull_algs,
+				  ARRAY_SIZE(crc32_pmull_algs));
+}
+
+static const struct cpu_feature __maybe_unused crc32_cpu_feature[] = {
+	{ cpu_feature(CRC32) }, { cpu_feature(PMULL) }, { }
+};
+MODULE_DEVICE_TABLE(cpu, crc32_cpu_feature);
+
+module_init(crc32_pmull_mod_init);
+module_exit(crc32_pmull_mod_exit);
+
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_CRYPTO("crc32");
+MODULE_ALIAS_CRYPTO("crc32c");