1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Cryptographic API for the 842 software comp 3 * Cryptographic API for the 842 software compression algorithm.
4 * 4 *
5 * Copyright (C) IBM Corporation, 2011-2015 5 * Copyright (C) IBM Corporation, 2011-2015
6 * 6 *
7 * Original Authors: Robert Jennings <rcj@linu 7 * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
8 * Seth Jennings <sjenning@l 8 * Seth Jennings <sjenning@linux.vnet.ibm.com>
9 * 9 *
10 * Rewrite: Dan Streetman <ddstreet@ieee.org> 10 * Rewrite: Dan Streetman <ddstreet@ieee.org>
11 * 11 *
12 * This is the software implementation of comp 12 * This is the software implementation of compression and decompression using
13 * the 842 format. This uses the software 842 13 * the 842 format. This uses the software 842 library at lib/842/ which is
14 * only a reference implementation, and is ver 14 * only a reference implementation, and is very, very slow as compared to other
15 * software compressors. You probably do not 15 * software compressors. You probably do not want to use this software
16 * compression. If you have access to the Pow 16 * compression. If you have access to the PowerPC 842 compression hardware, you
17 * want to use the 842 hardware compression in 17 * want to use the 842 hardware compression interface, which is at:
18 * drivers/crypto/nx/nx-842-crypto.c 18 * drivers/crypto/nx/nx-842-crypto.c
19 */ 19 */
20 20
21 #include <linux/init.h> 21 #include <linux/init.h>
22 #include <linux/module.h> 22 #include <linux/module.h>
23 #include <linux/crypto.h> 23 #include <linux/crypto.h>
24 #include <linux/sw842.h> 24 #include <linux/sw842.h>
25 #include <crypto/internal/scompress.h> 25 #include <crypto/internal/scompress.h>
26 26
27 struct crypto842_ctx { 27 struct crypto842_ctx {
28 void *wmem; /* working memory for 28 void *wmem; /* working memory for compress */
29 }; 29 };
30 30
31 static void *crypto842_alloc_ctx(struct crypto 31 static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
32 { 32 {
33 void *ctx; 33 void *ctx;
34 34
35 ctx = kmalloc(SW842_MEM_COMPRESS, GFP_ 35 ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
36 if (!ctx) 36 if (!ctx)
37 return ERR_PTR(-ENOMEM); 37 return ERR_PTR(-ENOMEM);
38 38
39 return ctx; 39 return ctx;
40 } 40 }
41 41
42 static int crypto842_init(struct crypto_tfm *t 42 static int crypto842_init(struct crypto_tfm *tfm)
43 { 43 {
44 struct crypto842_ctx *ctx = crypto_tfm 44 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
45 45
46 ctx->wmem = crypto842_alloc_ctx(NULL); 46 ctx->wmem = crypto842_alloc_ctx(NULL);
47 if (IS_ERR(ctx->wmem)) 47 if (IS_ERR(ctx->wmem))
48 return -ENOMEM; 48 return -ENOMEM;
49 49
50 return 0; 50 return 0;
51 } 51 }
52 52
53 static void crypto842_free_ctx(struct crypto_s 53 static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
54 { 54 {
55 kfree(ctx); 55 kfree(ctx);
56 } 56 }
57 57
58 static void crypto842_exit(struct crypto_tfm * 58 static void crypto842_exit(struct crypto_tfm *tfm)
59 { 59 {
60 struct crypto842_ctx *ctx = crypto_tfm 60 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
61 61
62 crypto842_free_ctx(NULL, ctx->wmem); 62 crypto842_free_ctx(NULL, ctx->wmem);
63 } 63 }
64 64
65 static int crypto842_compress(struct crypto_tf 65 static int crypto842_compress(struct crypto_tfm *tfm,
66 const u8 *src, u 66 const u8 *src, unsigned int slen,
67 u8 *dst, unsigne 67 u8 *dst, unsigned int *dlen)
68 { 68 {
69 struct crypto842_ctx *ctx = crypto_tfm 69 struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
70 70
71 return sw842_compress(src, slen, dst, 71 return sw842_compress(src, slen, dst, dlen, ctx->wmem);
72 } 72 }
73 73
74 static int crypto842_scompress(struct crypto_s 74 static int crypto842_scompress(struct crypto_scomp *tfm,
75 const u8 *src, 75 const u8 *src, unsigned int slen,
76 u8 *dst, unsign 76 u8 *dst, unsigned int *dlen, void *ctx)
77 { 77 {
78 return sw842_compress(src, slen, dst, 78 return sw842_compress(src, slen, dst, dlen, ctx);
79 } 79 }
80 80
81 static int crypto842_decompress(struct crypto_ 81 static int crypto842_decompress(struct crypto_tfm *tfm,
82 const u8 *src, 82 const u8 *src, unsigned int slen,
83 u8 *dst, unsig 83 u8 *dst, unsigned int *dlen)
84 { 84 {
85 return sw842_decompress(src, slen, dst 85 return sw842_decompress(src, slen, dst, dlen);
86 } 86 }
87 87
88 static int crypto842_sdecompress(struct crypto 88 static int crypto842_sdecompress(struct crypto_scomp *tfm,
89 const u8 *src 89 const u8 *src, unsigned int slen,
90 u8 *dst, unsi 90 u8 *dst, unsigned int *dlen, void *ctx)
91 { 91 {
92 return sw842_decompress(src, slen, dst 92 return sw842_decompress(src, slen, dst, dlen);
93 } 93 }
94 94
95 static struct crypto_alg alg = { 95 static struct crypto_alg alg = {
96 .cra_name = "842", 96 .cra_name = "842",
97 .cra_driver_name = "842-generic 97 .cra_driver_name = "842-generic",
98 .cra_priority = 100, 98 .cra_priority = 100,
99 .cra_flags = CRYPTO_ALG_T 99 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
100 .cra_ctxsize = sizeof(struc 100 .cra_ctxsize = sizeof(struct crypto842_ctx),
101 .cra_module = THIS_MODULE, 101 .cra_module = THIS_MODULE,
102 .cra_init = crypto842_in 102 .cra_init = crypto842_init,
103 .cra_exit = crypto842_ex 103 .cra_exit = crypto842_exit,
104 .cra_u = { .compress 104 .cra_u = { .compress = {
105 .coa_compress = crypto842_co 105 .coa_compress = crypto842_compress,
106 .coa_decompress = crypto842_de 106 .coa_decompress = crypto842_decompress } }
107 }; 107 };
108 108
109 static struct scomp_alg scomp = { 109 static struct scomp_alg scomp = {
110 .alloc_ctx = crypto842_al 110 .alloc_ctx = crypto842_alloc_ctx,
111 .free_ctx = crypto842_fr 111 .free_ctx = crypto842_free_ctx,
112 .compress = crypto842_sc 112 .compress = crypto842_scompress,
113 .decompress = crypto842_sd 113 .decompress = crypto842_sdecompress,
114 .base = { 114 .base = {
115 .cra_name = "842", 115 .cra_name = "842",
116 .cra_driver_name = "842-scomp" 116 .cra_driver_name = "842-scomp",
117 .cra_priority = 100, 117 .cra_priority = 100,
118 .cra_module = THIS_MODULE 118 .cra_module = THIS_MODULE,
119 } 119 }
120 }; 120 };
121 121
122 static int __init crypto842_mod_init(void) 122 static int __init crypto842_mod_init(void)
123 { 123 {
124 int ret; 124 int ret;
125 125
126 ret = crypto_register_alg(&alg); 126 ret = crypto_register_alg(&alg);
127 if (ret) 127 if (ret)
128 return ret; 128 return ret;
129 129
130 ret = crypto_register_scomp(&scomp); 130 ret = crypto_register_scomp(&scomp);
131 if (ret) { 131 if (ret) {
132 crypto_unregister_alg(&alg); 132 crypto_unregister_alg(&alg);
133 return ret; 133 return ret;
134 } 134 }
135 135
136 return ret; 136 return ret;
137 } 137 }
138 subsys_initcall(crypto842_mod_init); 138 subsys_initcall(crypto842_mod_init);
139 139
140 static void __exit crypto842_mod_exit(void) 140 static void __exit crypto842_mod_exit(void)
141 { 141 {
142 crypto_unregister_alg(&alg); 142 crypto_unregister_alg(&alg);
143 crypto_unregister_scomp(&scomp); 143 crypto_unregister_scomp(&scomp);
144 } 144 }
145 module_exit(crypto842_mod_exit); 145 module_exit(crypto842_mod_exit);
146 146
147 MODULE_LICENSE("GPL"); 147 MODULE_LICENSE("GPL");
148 MODULE_DESCRIPTION("842 Software Compression A 148 MODULE_DESCRIPTION("842 Software Compression Algorithm");
149 MODULE_ALIAS_CRYPTO("842"); 149 MODULE_ALIAS_CRYPTO("842");
150 MODULE_ALIAS_CRYPTO("842-generic"); 150 MODULE_ALIAS_CRYPTO("842-generic");
151 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.or 151 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
152 152
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