sparc64: Add CRC32C driver making use of the new crc32c opcode. (442a7c40) · Commits · git / linux-net

arch/sparc/crypto/Makefile

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		@@ -9,9 +9,13 @@ obj-$(CONFIG_CRYPTO_MD5_SPARC64) += md5-sparc64.o

		obj-$(CONFIG_CRYPTO_AES_SPARC64) += aes-sparc64.o

		obj-$(CONFIG_CRYPTO_CRC32C_SPARC64) += crc32c-sparc64.o

		sha1-sparc64-y := sha1_asm.o sha1_glue.o
		sha256-sparc64-y := sha256_asm.o sha256_glue.o
		sha512-sparc64-y := sha512_asm.o sha512_glue.o
		md5-sparc64-y := md5_asm.o md5_glue.o

		aes-sparc64-y := aes_asm.o aes_glue.o

		crc32c-sparc64-y := crc32c_asm.o crc32c_glue.o

arch/sparc/crypto/crc32c_asm.S

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		#include <linux/linkage.h>
		#include <asm/visasm.h>
		#include <asm/asi.h>

		#define F3F(x,y,z) (((x)<<30)\|((y)<<19)\|((z)<<5))

		#define FPD_ENCODE(x) (((x) >> 5) \| ((x) & ~(0x20)))

		#define RS1(x) (FPD_ENCODE(x) << 14)
		#define RS2(x) (FPD_ENCODE(x) << 0)
		#define RD(x) (FPD_ENCODE(x) << 25)

		#define CRC32C(a,b,c) \
		.word (F3F(2,0x36,0x147)\|RS1(a)\|RS2(b)\|RD(c));

		ENTRY(crc32c_sparc64)
		/* %o0=crc32p, %o1=data_ptr, %o2=len */
		VISEntryHalf
		lda [%o0] ASI_PL, %f1
		1: ldd [%o1], %f2
		CRC32C(0,2,0)
		subcc %o2, 8, %o2
		bne,pt %icc, 1b
		add %o1, 0x8, %o1
		sta %f1, [%o0] ASI_PL
		VISExitHalf
		2: retl
		nop
		ENDPROC(crc32c_sparc64)

arch/sparc/crypto/crc32c_glue.c

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Original line number	Diff line number	Diff line
		/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
		*
		* This is based largely upon arch/x86/crypto/crc32c-intel.c
		*
		* Copyright (C) 2008 Intel Corporation
		* Authors: Austin Zhang <austin_zhang@linux.intel.com>
		* Kent Liu <kent.liu@intel.com>
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/string.h>
		#include <linux/kernel.h>
		#include <linux/crc32.h>

		#include <crypto/internal/hash.h>

		#include <asm/pstate.h>
		#include <asm/elf.h>

		/*
		* Setting the seed allows arbitrary accumulators and flexible XOR policy
		* If your algorithm starts with ~0, then XOR with ~0 before you set
		* the seed.
		*/
		static int crc32c_sparc64_setkey(struct crypto_shash hash, const u8 key,
		unsigned int keylen)
		{
		u32 *mctx = crypto_shash_ctx(hash);

		if (keylen != sizeof(u32)) {
		crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
		}
		(__le32 )mctx = le32_to_cpup((__le32 *)key);
		return 0;
		}

		static int crc32c_sparc64_init(struct shash_desc *desc)
		{
		u32 *mctx = crypto_shash_ctx(desc->tfm);
		u32 *crcp = shash_desc_ctx(desc);

		crcp = mctx;

		return 0;
		}

		extern void crc32c_sparc64(u32 crcp, const u64 data, unsigned int len);

		static void crc32c_compute(u32 crcp, const u64 data, unsigned int len)
		{
		unsigned int asm_len;

		asm_len = len & ~7U;
		if (asm_len) {
		crc32c_sparc64(crcp, data, asm_len);
		data += asm_len / 8;
		len -= asm_len;
		}
		if (len)
		crcp = __crc32c_le(crcp, (const unsigned char *) data, len);
		}

		static int crc32c_sparc64_update(struct shash_desc desc, const u8 data,
		unsigned int len)
		{
		u32 *crcp = shash_desc_ctx(desc);

		crc32c_compute(crcp, (const u64 *) data, len);

		return 0;
		}

		static int __crc32c_sparc64_finup(u32 crcp, const u8 data, unsigned int len,
		u8 *out)
		{
		u32 tmp = *crcp;

		crc32c_compute(&tmp, (const u64 *) data, len);

		(__le32 ) out = ~cpu_to_le32(tmp);
		return 0;
		}

		static int crc32c_sparc64_finup(struct shash_desc desc, const u8 data,
		unsigned int len, u8 *out)
		{
		return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
		}

		static int crc32c_sparc64_final(struct shash_desc desc, u8 out)
		{
		u32 *crcp = shash_desc_ctx(desc);

		(__le32 ) out = ~cpu_to_le32p(crcp);
		return 0;
		}

		static int crc32c_sparc64_digest(struct shash_desc desc, const u8 data,
		unsigned int len, u8 *out)
		{
		return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
		out);
		}

		static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
		{
		u32 *key = crypto_tfm_ctx(tfm);

		*key = ~0;

		return 0;
		}

		#define CHKSUM_BLOCK_SIZE 1
		#define CHKSUM_DIGEST_SIZE 4

		static struct shash_alg alg = {
		.setkey = crc32c_sparc64_setkey,
		.init = crc32c_sparc64_init,
		.update = crc32c_sparc64_update,
		.final = crc32c_sparc64_final,
		.finup = crc32c_sparc64_finup,
		.digest = crc32c_sparc64_digest,
		.descsize = sizeof(u32),
		.digestsize = CHKSUM_DIGEST_SIZE,
		.base = {
		.cra_name = "crc32c",
		.cra_driver_name = "crc32c-sparc64",
		.cra_priority = 150,
		.cra_blocksize = CHKSUM_BLOCK_SIZE,
		.cra_ctxsize = sizeof(u32),
		.cra_alignmask = 7,
		.cra_module = THIS_MODULE,
		.cra_init = crc32c_sparc64_cra_init,
		}
		};

		static bool __init sparc64_has_crc32c_opcode(void)
		{
		unsigned long cfr;

		if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

		__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
		if (!(cfr & CFR_CRC32C))
		return false;

		return true;
		}

		static int __init crc32c_sparc64_mod_init(void)
		{
		if (sparc64_has_crc32c_opcode()) {
		pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
		return crypto_register_shash(&alg);
		}
		pr_info("sparc64 crc32c opcode not available.\n");
		return -ENODEV;
		}

		static void __exit crc32c_sparc64_mod_fini(void)
		{
		crypto_unregister_shash(&alg);
		}

		module_init(crc32c_sparc64_mod_init);
		module_exit(crc32c_sparc64_mod_fini);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");

		MODULE_ALIAS("crc32c");

crypto/Kconfig

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		@@ -336,6 +336,15 @@ config CRYPTO_CRC32C_INTEL
		gain performance compared with software implementation.
		Module will be crc32c-intel.

		config CRYPTO_CRC32C_SPARC64
		tristate "CRC32c CRC algorithm (SPARC64)"
		depends on SPARC64
		select CRYPTO_HASH
		select CRC32
		help
		CRC32c CRC algorithm implemented using sparc64 crypto instructions,
		when available.

		config CRYPTO_GHASH
		tristate "GHASH digest algorithm"
		select CRYPTO_GF128MUL