1 // SPDX-License-Identifier: GPL-2.0-or-later
2 #include <linux/scatterlist.h>
3 #include <crypto/acompress.h>
4 #include "compress.h"
5
__z_erofs_crypto_decompress(struct z_erofs_decompress_req * rq,struct crypto_acomp * tfm)6 static int __z_erofs_crypto_decompress(struct z_erofs_decompress_req *rq,
7 struct crypto_acomp *tfm)
8 {
9 struct sg_table st_src, st_dst;
10 struct acomp_req *req;
11 struct crypto_wait wait;
12 u8 *headpage;
13 int ret;
14
15 headpage = kmap_local_page(*rq->in);
16 ret = z_erofs_fixup_insize(rq, headpage + rq->pageofs_in,
17 min_t(unsigned int, rq->inputsize,
18 rq->sb->s_blocksize - rq->pageofs_in));
19 kunmap_local(headpage);
20 if (ret)
21 return ret;
22
23 req = acomp_request_alloc(tfm);
24 if (!req)
25 return -ENOMEM;
26
27 ret = sg_alloc_table_from_pages_segment(&st_src, rq->in, rq->inpages,
28 rq->pageofs_in, rq->inputsize, UINT_MAX, GFP_KERNEL);
29 if (ret < 0)
30 goto failed_src_alloc;
31
32 ret = sg_alloc_table_from_pages_segment(&st_dst, rq->out, rq->outpages,
33 rq->pageofs_out, rq->outputsize, UINT_MAX, GFP_KERNEL);
34 if (ret < 0)
35 goto failed_dst_alloc;
36
37 acomp_request_set_params(req, st_src.sgl,
38 st_dst.sgl, rq->inputsize, rq->outputsize);
39
40 crypto_init_wait(&wait);
41 acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
42 crypto_req_done, &wait);
43
44 ret = crypto_wait_req(crypto_acomp_decompress(req), &wait);
45 if (ret) {
46 erofs_err(rq->sb, "failed to decompress %d in[%u, %u] out[%u]",
47 ret, rq->inputsize, rq->pageofs_in, rq->outputsize);
48 ret = -EIO;
49 }
50
51 sg_free_table(&st_dst);
52 failed_dst_alloc:
53 sg_free_table(&st_src);
54 failed_src_alloc:
55 acomp_request_free(req);
56 return ret;
57 }
58
59 struct z_erofs_crypto_engine {
60 char *crypto_name;
61 struct crypto_acomp *tfm;
62 };
63
64 struct z_erofs_crypto_engine *z_erofs_crypto[Z_EROFS_COMPRESSION_MAX] = {
65 [Z_EROFS_COMPRESSION_LZ4] = (struct z_erofs_crypto_engine[]) {
66 {},
67 },
68 [Z_EROFS_COMPRESSION_LZMA] = (struct z_erofs_crypto_engine[]) {
69 {},
70 },
71 [Z_EROFS_COMPRESSION_DEFLATE] = (struct z_erofs_crypto_engine[]) {
72 { .crypto_name = "qat_deflate", },
73 {},
74 },
75 [Z_EROFS_COMPRESSION_ZSTD] = (struct z_erofs_crypto_engine[]) {
76 {},
77 },
78 };
79 static DECLARE_RWSEM(z_erofs_crypto_rwsem);
80
z_erofs_crypto_get_engine(int alg)81 static struct crypto_acomp *z_erofs_crypto_get_engine(int alg)
82 {
83 struct z_erofs_crypto_engine *e;
84
85 for (e = z_erofs_crypto[alg]; e->crypto_name; ++e)
86 if (e->tfm)
87 return e->tfm;
88 return NULL;
89 }
90
z_erofs_crypto_decompress(struct z_erofs_decompress_req * rq,struct page ** pgpl)91 int z_erofs_crypto_decompress(struct z_erofs_decompress_req *rq,
92 struct page **pgpl)
93 {
94 struct crypto_acomp *tfm;
95 int i, err;
96
97 down_read(&z_erofs_crypto_rwsem);
98 tfm = z_erofs_crypto_get_engine(rq->alg);
99 if (!tfm) {
100 err = -EOPNOTSUPP;
101 goto out;
102 }
103
104 for (i = 0; i < rq->outpages; i++) {
105 struct page *const page = rq->out[i];
106 struct page *victim;
107
108 if (!page) {
109 victim = __erofs_allocpage(pgpl, rq->gfp, true);
110 if (!victim) {
111 err = -ENOMEM;
112 goto out;
113 }
114 set_page_private(victim, Z_EROFS_SHORTLIVED_PAGE);
115 rq->out[i] = victim;
116 }
117 }
118 err = __z_erofs_crypto_decompress(rq, tfm);
119 out:
120 up_read(&z_erofs_crypto_rwsem);
121 return err;
122 }
123
z_erofs_crypto_enable_engine(const char * name,int len)124 int z_erofs_crypto_enable_engine(const char *name, int len)
125 {
126 struct z_erofs_crypto_engine *e;
127 struct crypto_acomp *tfm;
128 int alg;
129
130 down_write(&z_erofs_crypto_rwsem);
131 for (alg = 0; alg < Z_EROFS_COMPRESSION_MAX; ++alg) {
132 for (e = z_erofs_crypto[alg]; e->crypto_name; ++e) {
133 if (!strncmp(name, e->crypto_name, len)) {
134 if (e->tfm)
135 break;
136 tfm = crypto_alloc_acomp(e->crypto_name, 0, 0);
137 if (IS_ERR(tfm)) {
138 up_write(&z_erofs_crypto_rwsem);
139 return -EOPNOTSUPP;
140 }
141 e->tfm = tfm;
142 break;
143 }
144 }
145 }
146 up_write(&z_erofs_crypto_rwsem);
147 return 0;
148 }
149
z_erofs_crypto_disable_all_engines(void)150 void z_erofs_crypto_disable_all_engines(void)
151 {
152 struct z_erofs_crypto_engine *e;
153 int alg;
154
155 down_write(&z_erofs_crypto_rwsem);
156 for (alg = 0; alg < Z_EROFS_COMPRESSION_MAX; ++alg) {
157 for (e = z_erofs_crypto[alg]; e->crypto_name; ++e) {
158 if (!e->tfm)
159 continue;
160 crypto_free_acomp(e->tfm);
161 e->tfm = NULL;
162 }
163 }
164 up_write(&z_erofs_crypto_rwsem);
165 }
166
z_erofs_crypto_show_engines(char * buf,int size,char sep)167 int z_erofs_crypto_show_engines(char *buf, int size, char sep)
168 {
169 struct z_erofs_crypto_engine *e;
170 int alg, len = 0;
171
172 for (alg = 0; alg < Z_EROFS_COMPRESSION_MAX; ++alg) {
173 for (e = z_erofs_crypto[alg]; e->crypto_name; ++e) {
174 if (!e->tfm)
175 continue;
176 len += scnprintf(buf + len, size - len, "%s%c",
177 e->crypto_name, sep);
178 }
179 }
180 return len;
181 }
182