Line data Source code
1 : /*
2 : * Copyright (c) 2017 Cisco and/or its affiliates.
3 : * Licensed under the Apache License, Version 2.0 (the "License");
4 : * you may not use this file except in compliance with the License.
5 : * You may obtain a copy of the License at:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
9 : * Unless required by applicable law or agreed to in writing, software
10 : * distributed under the License is distributed on an "AS IS" BASIS,
11 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 : * See the License for the specific language governing permissions and
13 : * limitations under the License.
14 : */
15 :
16 : #include <vppinfra/clib.h>
17 : #include <vppinfra/clib_error.h>
18 : #include <vppinfra/format.h>
19 : #include <vppinfra/bitmap.h>
20 :
21 : #include <sys/types.h>
22 : #include <sys/stat.h>
23 : #include <fcntl.h>
24 : #include <dirent.h>
25 :
26 : __clib_export clib_error_t *
27 0 : clib_sysfs_write (char *file_name, char *fmt, ...)
28 : {
29 : u8 *s;
30 : int fd;
31 0 : clib_error_t *error = 0;
32 :
33 0 : fd = open (file_name, O_WRONLY);
34 0 : if (fd < 0)
35 0 : return clib_error_return_unix (0, "open `%s'", file_name);
36 :
37 : va_list va;
38 0 : va_start (va, fmt);
39 0 : s = va_format (0, fmt, &va);
40 0 : va_end (va);
41 :
42 0 : if (write (fd, s, vec_len (s)) < 0)
43 0 : error = clib_error_return_unix (0, "write `%s'", file_name);
44 :
45 0 : vec_free (s);
46 0 : close (fd);
47 0 : return error;
48 : }
49 :
50 : __clib_export clib_error_t *
51 1049020 : clib_sysfs_read (char *file_name, char *fmt, ...)
52 : {
53 : unformat_input_t input;
54 1049020 : u8 *s = 0;
55 : int fd;
56 : ssize_t sz;
57 : uword result;
58 :
59 1049020 : fd = open (file_name, O_RDONLY);
60 1049020 : if (fd < 0)
61 172500 : return clib_error_return_unix (0, "open `%s'", file_name);
62 :
63 876520 : vec_validate (s, 4095);
64 :
65 876520 : sz = read (fd, s, vec_len (s));
66 876520 : if (sz < 0)
67 : {
68 0 : close (fd);
69 0 : vec_free (s);
70 0 : return clib_error_return_unix (0, "read `%s'", file_name);
71 : }
72 :
73 876520 : vec_set_len (s, sz);
74 876520 : unformat_init_vector (&input, s);
75 :
76 : va_list va;
77 876520 : va_start (va, fmt);
78 876520 : result = va_unformat (&input, fmt, &va);
79 876520 : va_end (va);
80 :
81 876520 : vec_free (s);
82 876520 : close (fd);
83 :
84 876520 : if (result == 0)
85 0 : return clib_error_return (0, "unformat error");
86 :
87 876520 : return 0;
88 : }
89 :
90 :
91 : clib_error_t *
92 0 : clib_sysfs_set_nr_hugepages (int numa_node, int log2_page_size, int nr)
93 : {
94 0 : clib_error_t *error = 0;
95 : struct stat sb;
96 0 : u8 *p = 0;
97 : uword page_size;
98 :
99 0 : if (log2_page_size == 0)
100 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
101 :
102 0 : page_size = 1ULL << (log2_page_size - 10);
103 :
104 0 : p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
105 :
106 0 : if (stat ((char *) p, &sb) == 0)
107 : {
108 0 : if (S_ISDIR (sb.st_mode) == 0)
109 : {
110 0 : error = clib_error_return (0, "'%s' is not directory", p);
111 0 : goto done;
112 : }
113 : }
114 0 : else if (numa_node == 0)
115 : {
116 0 : vec_reset_length (p);
117 0 : p = format (p, "/sys/kernel/mm%c", 0);
118 0 : if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
119 : {
120 0 : error = clib_error_return (0, "'%s' does not exist or it is not "
121 : "directory", p);
122 0 : goto done;
123 : }
124 : }
125 : else
126 : {
127 0 : error = clib_error_return (0, "'%s' does not exist", p);
128 0 : goto done;
129 : }
130 :
131 0 : vec_dec_len (p, 1);
132 0 : p = format (p, "/hugepages/hugepages-%ukB/nr_hugepages%c", page_size, 0);
133 0 : clib_sysfs_write ((char *) p, "%d", nr);
134 :
135 0 : done:
136 0 : vec_free (p);
137 0 : return error;
138 : }
139 :
140 :
141 : static clib_error_t *
142 0 : clib_sysfs_get_xxx_hugepages (char *type, int numa_node,
143 : int log2_page_size, int *val)
144 : {
145 0 : clib_error_t *error = 0;
146 : struct stat sb;
147 0 : u8 *p = 0;
148 :
149 : uword page_size;
150 :
151 0 : if (log2_page_size == 0)
152 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
153 :
154 0 : page_size = 1ULL << (log2_page_size - 10);
155 :
156 :
157 0 : p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
158 :
159 0 : if (stat ((char *) p, &sb) == 0)
160 : {
161 0 : if (S_ISDIR (sb.st_mode) == 0)
162 : {
163 0 : error = clib_error_return (0, "'%s' is not directory", p);
164 0 : goto done;
165 : }
166 : }
167 0 : else if (numa_node == 0)
168 : {
169 0 : vec_reset_length (p);
170 0 : p = format (p, "/sys/kernel/mm%c", 0);
171 0 : if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
172 : {
173 0 : error = clib_error_return (0, "'%s' does not exist or it is not "
174 : "directory", p);
175 0 : goto done;
176 : }
177 : }
178 : else
179 : {
180 0 : error = clib_error_return (0, "'%s' does not exist", p);
181 0 : goto done;
182 : }
183 :
184 0 : vec_dec_len (p, 1);
185 0 : p = format (p, "/hugepages/hugepages-%ukB/%s_hugepages%c", page_size,
186 : type, 0);
187 0 : error = clib_sysfs_read ((char *) p, "%d", val);
188 :
189 0 : done:
190 0 : vec_free (p);
191 0 : return error;
192 : }
193 :
194 : clib_error_t *
195 0 : clib_sysfs_get_free_hugepages (int numa_node, int log2_page_size, int *v)
196 : {
197 0 : return clib_sysfs_get_xxx_hugepages ("free", numa_node, log2_page_size, v);
198 : }
199 :
200 : clib_error_t *
201 0 : clib_sysfs_get_nr_hugepages (int numa_node, int log2_page_size, int *v)
202 : {
203 0 : return clib_sysfs_get_xxx_hugepages ("nr", numa_node, log2_page_size, v);
204 : }
205 :
206 : clib_error_t *
207 0 : clib_sysfs_get_surplus_hugepages (int numa_node, int log2_page_size, int *v)
208 : {
209 0 : return clib_sysfs_get_xxx_hugepages ("surplus", numa_node, log2_page_size,
210 : v);
211 : }
212 :
213 : clib_error_t *
214 0 : clib_sysfs_prealloc_hugepages (int numa_node, int log2_page_size, int nr)
215 : {
216 0 : clib_error_t *error = 0;
217 : int n, needed;
218 : uword page_size;
219 :
220 0 : if (log2_page_size == 0)
221 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
222 :
223 0 : page_size = 1ULL << (log2_page_size - 10);
224 :
225 0 : error = clib_sysfs_get_free_hugepages (numa_node, log2_page_size, &n);
226 0 : if (error)
227 0 : return error;
228 0 : needed = nr - n;
229 0 : if (needed <= 0)
230 0 : return 0;
231 :
232 0 : error = clib_sysfs_get_nr_hugepages (numa_node, log2_page_size, &n);
233 0 : if (error)
234 0 : return error;
235 0 : clib_warning ("pre-allocating %u additional %uK hugepages on numa node %u",
236 : needed, page_size, numa_node);
237 0 : return clib_sysfs_set_nr_hugepages (numa_node, log2_page_size, n + needed);
238 : }
239 :
240 : __clib_export uword *
241 1150 : clib_sysfs_list_to_bitmap (char *filename)
242 : {
243 : FILE *fp;
244 1150 : uword *r = 0;
245 :
246 1150 : fp = fopen (filename, "r");
247 :
248 1150 : if (fp != NULL)
249 : {
250 1150 : u8 *buffer = 0;
251 1150 : vec_validate (buffer, 256 - 1);
252 1150 : if (fgets ((char *) buffer, 256, fp))
253 : {
254 : unformat_input_t in;
255 1150 : unformat_init_string (&in, (char *) buffer,
256 1150 : strlen ((char *) buffer));
257 1150 : if (unformat (&in, "%U", unformat_bitmap_list, &r) != 1)
258 0 : clib_warning ("unformat_bitmap_list failed");
259 1150 : unformat_free (&in);
260 : }
261 1150 : vec_free (buffer);
262 1150 : fclose (fp);
263 : }
264 1150 : return r;
265 : }
266 :
267 : /*
268 : * fd.io coding-style-patch-verification: ON
269 : *
270 : * Local Variables:
271 : * eval: (c-set-style "gnu")
272 : * End:
273 : */
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