[linux-2.6-block.git] / arch / sparc / crypto / crc32c_glue.c

// SPDX-License-Identifier: GPL-2.0-only
/* 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>

#include "opcodes.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		=	SPARC_CR_OPCODE_PRIORITY,
		.cra_flags		=	CRYPTO_ALG_OPTIONAL_KEY,
		.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_CRYPTO("crc32c");

#include "crop_devid.c"
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
442a7c40 DM	2	/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
	3	*
	4	* This is based largely upon arch/x86/crypto/crc32c-intel.c
	5	*
	6	* Copyright (C) 2008 Intel Corporation
	7	* Authors: Austin Zhang <austin_zhang@linux.intel.com>
	8	* Kent Liu <kent.liu@intel.com>
	9	*/
	10
	11	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	12
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/string.h>
	16	#include <linux/kernel.h>
	17	#include <linux/crc32.h>
	18
	19	#include <crypto/internal/hash.h>
	20
	21	#include <asm/pstate.h>
	22	#include <asm/elf.h>
	23
10803624 DM	24	#include "opcodes.h"
10803624 DM	25
442a7c40 DM	26	/*
	27	* Setting the seed allows arbitrary accumulators and flexible XOR policy
	28	* If your algorithm starts with ~0, then XOR with ~0 before you set
	29	* the seed.
	30	*/
	31	static int crc32c_sparc64_setkey(struct crypto_shash hash, const u8 key,
	32	unsigned int keylen)
	33	{
	34	u32 *mctx = crypto_shash_ctx(hash);
	35
	36	if (keylen != sizeof(u32)) {
	37	crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
	38	return -EINVAL;
	39	}
	40	(__le32 )mctx = le32_to_cpup((__le32 *)key);
	41	return 0;
	42	}
	43
	44	static int crc32c_sparc64_init(struct shash_desc *desc)
	45	{
	46	u32 *mctx = crypto_shash_ctx(desc->tfm);
	47	u32 *crcp = shash_desc_ctx(desc);
	48
	49	crcp = mctx;
	50
	51	return 0;
	52	}
	53
	54	extern void crc32c_sparc64(u32 crcp, const u64 data, unsigned int len);
	55
	56	static void crc32c_compute(u32 crcp, const u64 data, unsigned int len)
	57	{
	58	unsigned int asm_len;
	59
	60	asm_len = len & ~7U;
	61	if (asm_len) {
	62	crc32c_sparc64(crcp, data, asm_len);
	63	data += asm_len / 8;
	64	len -= asm_len;
	65	}
	66	if (len)
	67	crcp = __crc32c_le(crcp, (const unsigned char *) data, len);
	68	}
	69
	70	static int crc32c_sparc64_update(struct shash_desc desc, const u8 data,
	71	unsigned int len)
	72	{
	73	u32 *crcp = shash_desc_ctx(desc);
	74
	75	crc32c_compute(crcp, (const u64 *) data, len);
	76
	77	return 0;
	78	}
	79
	80	static int __crc32c_sparc64_finup(u32 crcp, const u8 data, unsigned int len,
	81	u8 *out)
	82	{
	83	u32 tmp = *crcp;
	84
	85	crc32c_compute(&tmp, (const u64 *) data, len);
	86
	87	(__le32 ) out = ~cpu_to_le32(tmp);
	88	return 0;
	89	}
90
91	static int crc32c_sparc64_finup(struct shash_desc desc, const u8 data,
92	unsigned int len, u8 *out)
93	{
94	return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
95	}
96
97	static int crc32c_sparc64_final(struct shash_desc desc, u8 out)
98	{
99	u32 *crcp = shash_desc_ctx(desc);
100
101	(__le32 ) out = ~cpu_to_le32p(crcp);
102	return 0;
103	}
104
105	static int crc32c_sparc64_digest(struct shash_desc desc, const u8 data,
106	unsigned int len, u8 *out)
107	{
108	return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
109	out);
110	}
111
112	static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
113	{
114	u32 *key = crypto_tfm_ctx(tfm);
115
116	*key = ~0;
117
118	return 0;
119	}
120
121	#define CHKSUM_BLOCK_SIZE 1
122	#define CHKSUM_DIGEST_SIZE 4
123
124	static struct shash_alg alg = {
125	.setkey = crc32c_sparc64_setkey,
126	.init = crc32c_sparc64_init,
127	.update = crc32c_sparc64_update,
128	.final = crc32c_sparc64_final,
129	.finup = crc32c_sparc64_finup,
130	.digest = crc32c_sparc64_digest,
131	.descsize = sizeof(u32),
132	.digestsize = CHKSUM_DIGEST_SIZE,
133	.base = {
134	.cra_name = "crc32c",
135	.cra_driver_name = "crc32c-sparc64",
10803624	136	.cra_priority = SPARC_CR_OPCODE_PRIORITY,
a208fa8f	137	.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
442a7c40 DM	138	.cra_blocksize = CHKSUM_BLOCK_SIZE,
	139	.cra_ctxsize = sizeof(u32),
	140	.cra_alignmask = 7,
	141	.cra_module = THIS_MODULE,
	142	.cra_init = crc32c_sparc64_cra_init,
	143	}
	144	};
	145
	146	static bool __init sparc64_has_crc32c_opcode(void)
	147	{
	148	unsigned long cfr;
	149
	150	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
	151	return false;
	152
	153	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	154	if (!(cfr & CFR_CRC32C))
	155	return false;
	156
	157	return true;
	158	}
	159
	160	static int __init crc32c_sparc64_mod_init(void)
	161	{
	162	if (sparc64_has_crc32c_opcode()) {
	163	pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
	164	return crypto_register_shash(&alg);
	165	}
	166	pr_info("sparc64 crc32c opcode not available.\n");
	167	return -ENODEV;
	168	}
	169
	170	static void __exit crc32c_sparc64_mod_fini(void)
	171	{
	172	crypto_unregister_shash(&alg);
	173	}
	174
	175	module_init(crc32c_sparc64_mod_init);
	176	module_exit(crc32c_sparc64_mod_fini);
	177
	178	MODULE_LICENSE("GPL");
	179	MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
	180
5d26a105	181	MODULE_ALIAS_CRYPTO("crc32c");
226f7cea DM	182
226f7cea DM	183	#include "crop_devid.c"