1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Cryptographic API for the 842 software comp 2 * Cryptographic API for the 842 software compression algorithm.
4 * 3 *
>> 4 * This program is free software; you can redistribute it and/or modify
>> 5 * it under the terms of the GNU General Public License as published by
>> 6 * the Free Software Foundation; either version 2 of the License, or
>> 7 * (at your option) any later version.
>> 8 *
>> 9 * This program is distributed in the hope that it will be useful,
>> 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 12 * GNU General Public License for more details.
>> 13 *
5 * Copyright (C) IBM Corporation, 2011-2015 14 * Copyright (C) IBM Corporation, 2011-2015
6 * 15 *
7 * Original Authors: Robert Jennings <rcj@linu 16 * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
8 * Seth Jennings <sjenning@l 17 * Seth Jennings <sjenning@linux.vnet.ibm.com>
9 * 18 *
10 * Rewrite: Dan Streetman <ddstreet@ieee.org> 19 * Rewrite: Dan Streetman <ddstreet@ieee.org>
11 * 20 *
12 * This is the software implementation of comp 21 * This is the software implementation of compression and decompression using
13 * the 842 format. This uses the software 842 22 * the 842 format. This uses the software 842 library at lib/842/ which is
14 * only a reference implementation, and is ver 23 * only a reference implementation, and is very, very slow as compared to other
15 * software compressors. You probably do not 24 * software compressors. You probably do not want to use this software
16 * compression. If you have access to the Pow 25 * compression. If you have access to the PowerPC 842 compression hardware, you
17 * want to use the 842 hardware compression in 26 * want to use the 842 hardware compression interface, which is at:
18 * drivers/crypto/nx/nx-842-crypto.c 27 * drivers/crypto/nx/nx-842-crypto.c
19 */ 28 */
20 29
21 #include <linux/init.h> 30 #include <linux/init.h>
22 #include <linux/module.h> 31 #include <linux/module.h>
23 #include <linux/crypto.h> 32 #include <linux/crypto.h>
24 #include <linux/sw842.h> 33 #include <linux/sw842.h>
25 #include <crypto/internal/scompress.h> 34 #include <crypto/internal/scompress.h>
26 35
27 struct crypto842_ctx { 36 struct crypto842_ctx {
28 void *wmem; /* working memory for 37 void *wmem; /* working memory for compress */
29 }; 38 };
30 39
31 static void *crypto842_alloc_ctx(struct crypto 40 static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
32 { 41 {
33 void *ctx; 42 void *ctx;
34 43
35 ctx = kmalloc(SW842_MEM_COMPRESS, GFP_ 44 ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
36 if (!ctx) 45 if (!ctx)
37 return ERR_PTR(-ENOMEM); 46 return ERR_PTR(-ENOMEM);
38 47
39 return ctx; 48 return ctx;
40 } 49 }
41 50
42 static int crypto842_init(struct crypto_tfm *t 51 static int crypto842_init(struct crypto_tfm *tfm)
43 { 52 {
44 struct crypto842_ctx *ctx = crypto_tfm 53 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
45 54
46 ctx->wmem = crypto842_alloc_ctx(NULL); 55 ctx->wmem = crypto842_alloc_ctx(NULL);
47 if (IS_ERR(ctx->wmem)) 56 if (IS_ERR(ctx->wmem))
48 return -ENOMEM; 57 return -ENOMEM;
49 58
50 return 0; 59 return 0;
51 } 60 }
52 61
53 static void crypto842_free_ctx(struct crypto_s 62 static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
54 { 63 {
55 kfree(ctx); 64 kfree(ctx);
56 } 65 }
57 66
58 static void crypto842_exit(struct crypto_tfm * 67 static void crypto842_exit(struct crypto_tfm *tfm)
59 { 68 {
60 struct crypto842_ctx *ctx = crypto_tfm 69 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
61 70
62 crypto842_free_ctx(NULL, ctx->wmem); 71 crypto842_free_ctx(NULL, ctx->wmem);
63 } 72 }
64 73
65 static int crypto842_compress(struct crypto_tf 74 static int crypto842_compress(struct crypto_tfm *tfm,
66 const u8 *src, u 75 const u8 *src, unsigned int slen,
67 u8 *dst, unsigne 76 u8 *dst, unsigned int *dlen)
68 { 77 {
69 struct crypto842_ctx *ctx = crypto_tfm 78 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
70 79
71 return sw842_compress(src, slen, dst, 80 return sw842_compress(src, slen, dst, dlen, ctx->wmem);
72 } 81 }
73 82
74 static int crypto842_scompress(struct crypto_s 83 static int crypto842_scompress(struct crypto_scomp *tfm,
75 const u8 *src, 84 const u8 *src, unsigned int slen,
76 u8 *dst, unsign 85 u8 *dst, unsigned int *dlen, void *ctx)
77 { 86 {
78 return sw842_compress(src, slen, dst, 87 return sw842_compress(src, slen, dst, dlen, ctx);
79 } 88 }
80 89
81 static int crypto842_decompress(struct crypto_ 90 static int crypto842_decompress(struct crypto_tfm *tfm,
82 const u8 *src, 91 const u8 *src, unsigned int slen,
83 u8 *dst, unsig 92 u8 *dst, unsigned int *dlen)
84 { 93 {
85 return sw842_decompress(src, slen, dst 94 return sw842_decompress(src, slen, dst, dlen);
86 } 95 }
87 96
88 static int crypto842_sdecompress(struct crypto 97 static int crypto842_sdecompress(struct crypto_scomp *tfm,
89 const u8 *src 98 const u8 *src, unsigned int slen,
90 u8 *dst, unsi 99 u8 *dst, unsigned int *dlen, void *ctx)
91 { 100 {
92 return sw842_decompress(src, slen, dst 101 return sw842_decompress(src, slen, dst, dlen);
93 } 102 }
94 103
95 static struct crypto_alg alg = { 104 static struct crypto_alg alg = {
96 .cra_name = "842", 105 .cra_name = "842",
97 .cra_driver_name = "842-generic 106 .cra_driver_name = "842-generic",
98 .cra_priority = 100, 107 .cra_priority = 100,
99 .cra_flags = CRYPTO_ALG_T 108 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
100 .cra_ctxsize = sizeof(struc 109 .cra_ctxsize = sizeof(struct crypto842_ctx),
101 .cra_module = THIS_MODULE, 110 .cra_module = THIS_MODULE,
102 .cra_init = crypto842_in 111 .cra_init = crypto842_init,
103 .cra_exit = crypto842_ex 112 .cra_exit = crypto842_exit,
104 .cra_u = { .compress 113 .cra_u = { .compress = {
105 .coa_compress = crypto842_co 114 .coa_compress = crypto842_compress,
106 .coa_decompress = crypto842_de 115 .coa_decompress = crypto842_decompress } }
107 }; 116 };
108 117
109 static struct scomp_alg scomp = { 118 static struct scomp_alg scomp = {
110 .alloc_ctx = crypto842_al 119 .alloc_ctx = crypto842_alloc_ctx,
111 .free_ctx = crypto842_fr 120 .free_ctx = crypto842_free_ctx,
112 .compress = crypto842_sc 121 .compress = crypto842_scompress,
113 .decompress = crypto842_sd 122 .decompress = crypto842_sdecompress,
114 .base = { 123 .base = {
115 .cra_name = "842", 124 .cra_name = "842",
116 .cra_driver_name = "842-scomp" 125 .cra_driver_name = "842-scomp",
117 .cra_priority = 100, 126 .cra_priority = 100,
118 .cra_module = THIS_MODULE 127 .cra_module = THIS_MODULE,
119 } 128 }
120 }; 129 };
121 130
122 static int __init crypto842_mod_init(void) 131 static int __init crypto842_mod_init(void)
123 { 132 {
124 int ret; 133 int ret;
125 134
126 ret = crypto_register_alg(&alg); 135 ret = crypto_register_alg(&alg);
127 if (ret) 136 if (ret)
128 return ret; 137 return ret;
129 138
130 ret = crypto_register_scomp(&scomp); 139 ret = crypto_register_scomp(&scomp);
131 if (ret) { 140 if (ret) {
132 crypto_unregister_alg(&alg); 141 crypto_unregister_alg(&alg);
133 return ret; 142 return ret;
134 } 143 }
135 144
136 return ret; 145 return ret;
137 } 146 }
138 subsys_initcall(crypto842_mod_init); !! 147 module_init(crypto842_mod_init);
139 148
140 static void __exit crypto842_mod_exit(void) 149 static void __exit crypto842_mod_exit(void)
141 { 150 {
142 crypto_unregister_alg(&alg); 151 crypto_unregister_alg(&alg);
143 crypto_unregister_scomp(&scomp); 152 crypto_unregister_scomp(&scomp);
144 } 153 }
145 module_exit(crypto842_mod_exit); 154 module_exit(crypto842_mod_exit);
146 155
147 MODULE_LICENSE("GPL"); 156 MODULE_LICENSE("GPL");
148 MODULE_DESCRIPTION("842 Software Compression A 157 MODULE_DESCRIPTION("842 Software Compression Algorithm");
149 MODULE_ALIAS_CRYPTO("842"); 158 MODULE_ALIAS_CRYPTO("842");
150 MODULE_ALIAS_CRYPTO("842-generic"); 159 MODULE_ALIAS_CRYPTO("842-generic");
151 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.or 160 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
152 161
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