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 853809 : clib_sysfs_read (char *file_name, char *fmt, ...)
52 : {
53 : unformat_input_t input;
54 853809 : u8 *s = 0;
55 : int fd;
56 : ssize_t sz;
57 : uword result;
58 :
59 853809 : fd = open (file_name, O_RDONLY);
60 853809 : if (fd < 0)
61 167700 : return clib_error_return_unix (0, "open `%s'", file_name);
62 :
63 686109 : vec_validate (s, 4095);
64 :
65 686109 : sz = read (fd, s, vec_len (s));
66 686109 : 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 686109 : vec_set_len (s, sz);
74 686109 : unformat_init_vector (&input, s);
75 :
76 : va_list va;
77 686109 : va_start (va, fmt);
78 686109 : result = va_unformat (&input, fmt, &va);
79 686109 : va_end (va);
80 :
81 686109 : vec_free (s);
82 686109 : close (fd);
83 :
84 686109 : if (result == 0)
85 0 : return clib_error_return (0, "unformat error");
86 :
87 686109 : return 0;
88 : }
89 :
90 : __clib_export u8 *
91 332046 : clib_sysfs_link_to_name (char *link)
92 : {
93 : char *p, buffer[64];
94 : unformat_input_t in;
95 332046 : u8 *s = 0;
96 : int r;
97 :
98 332046 : r = readlink (link, buffer, sizeof (buffer) - 1);
99 :
100 332046 : if (r < 0)
101 128570 : return 0;
102 :
103 203476 : buffer[r] = 0;
104 203476 : p = strrchr (buffer, '/');
105 :
106 203476 : if (!p)
107 0 : return 0;
108 :
109 203476 : unformat_init_string (&in, p + 1, strlen (p + 1));
110 203476 : if (unformat (&in, "%s", &s) != 1)
111 0 : clib_unix_warning ("no string?");
112 203476 : unformat_free (&in);
113 :
114 203476 : return s;
115 : }
116 :
117 : clib_error_t *
118 0 : clib_sysfs_set_nr_hugepages (int numa_node, int log2_page_size, int nr)
119 : {
120 0 : clib_error_t *error = 0;
121 : struct stat sb;
122 0 : u8 *p = 0;
123 : uword page_size;
124 :
125 0 : if (log2_page_size == 0)
126 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
127 :
128 0 : page_size = 1ULL << (log2_page_size - 10);
129 :
130 0 : p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
131 :
132 0 : if (stat ((char *) p, &sb) == 0)
133 : {
134 0 : if (S_ISDIR (sb.st_mode) == 0)
135 : {
136 0 : error = clib_error_return (0, "'%s' is not directory", p);
137 0 : goto done;
138 : }
139 : }
140 0 : else if (numa_node == 0)
141 : {
142 0 : vec_reset_length (p);
143 0 : p = format (p, "/sys/kernel/mm%c", 0);
144 0 : if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
145 : {
146 0 : error = clib_error_return (0, "'%s' does not exist or it is not "
147 : "directory", p);
148 0 : goto done;
149 : }
150 : }
151 : else
152 : {
153 0 : error = clib_error_return (0, "'%s' does not exist", p);
154 0 : goto done;
155 : }
156 :
157 0 : vec_dec_len (p, 1);
158 0 : p = format (p, "/hugepages/hugepages-%ukB/nr_hugepages%c", page_size, 0);
159 0 : clib_sysfs_write ((char *) p, "%d", nr);
160 :
161 0 : done:
162 0 : vec_free (p);
163 0 : return error;
164 : }
165 :
166 :
167 : static clib_error_t *
168 0 : clib_sysfs_get_xxx_hugepages (char *type, int numa_node,
169 : int log2_page_size, int *val)
170 : {
171 0 : clib_error_t *error = 0;
172 : struct stat sb;
173 0 : u8 *p = 0;
174 :
175 : uword page_size;
176 :
177 0 : if (log2_page_size == 0)
178 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
179 :
180 0 : page_size = 1ULL << (log2_page_size - 10);
181 :
182 :
183 0 : p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
184 :
185 0 : if (stat ((char *) p, &sb) == 0)
186 : {
187 0 : if (S_ISDIR (sb.st_mode) == 0)
188 : {
189 0 : error = clib_error_return (0, "'%s' is not directory", p);
190 0 : goto done;
191 : }
192 : }
193 0 : else if (numa_node == 0)
194 : {
195 0 : vec_reset_length (p);
196 0 : p = format (p, "/sys/kernel/mm%c", 0);
197 0 : if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
198 : {
199 0 : error = clib_error_return (0, "'%s' does not exist or it is not "
200 : "directory", p);
201 0 : goto done;
202 : }
203 : }
204 : else
205 : {
206 0 : error = clib_error_return (0, "'%s' does not exist", p);
207 0 : goto done;
208 : }
209 :
210 0 : vec_dec_len (p, 1);
211 0 : p = format (p, "/hugepages/hugepages-%ukB/%s_hugepages%c", page_size,
212 : type, 0);
213 0 : error = clib_sysfs_read ((char *) p, "%d", val);
214 :
215 0 : done:
216 0 : vec_free (p);
217 0 : return error;
218 : }
219 :
220 : clib_error_t *
221 0 : clib_sysfs_get_free_hugepages (int numa_node, int log2_page_size, int *v)
222 : {
223 0 : return clib_sysfs_get_xxx_hugepages ("free", numa_node, log2_page_size, v);
224 : }
225 :
226 : clib_error_t *
227 0 : clib_sysfs_get_nr_hugepages (int numa_node, int log2_page_size, int *v)
228 : {
229 0 : return clib_sysfs_get_xxx_hugepages ("nr", numa_node, log2_page_size, v);
230 : }
231 :
232 : clib_error_t *
233 0 : clib_sysfs_get_surplus_hugepages (int numa_node, int log2_page_size, int *v)
234 : {
235 0 : return clib_sysfs_get_xxx_hugepages ("surplus", numa_node, log2_page_size,
236 : v);
237 : }
238 :
239 : clib_error_t *
240 0 : clib_sysfs_prealloc_hugepages (int numa_node, int log2_page_size, int nr)
241 : {
242 0 : clib_error_t *error = 0;
243 : int n, needed;
244 : uword page_size;
245 :
246 0 : if (log2_page_size == 0)
247 0 : log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
248 :
249 0 : page_size = 1ULL << (log2_page_size - 10);
250 :
251 0 : error = clib_sysfs_get_free_hugepages (numa_node, log2_page_size, &n);
252 0 : if (error)
253 0 : return error;
254 0 : needed = nr - n;
255 0 : if (needed <= 0)
256 0 : return 0;
257 :
258 0 : error = clib_sysfs_get_nr_hugepages (numa_node, log2_page_size, &n);
259 0 : if (error)
260 0 : return error;
261 0 : clib_warning ("pre-allocating %u additional %uK hugepages on numa node %u",
262 : needed, page_size, numa_node);
263 0 : return clib_sysfs_set_nr_hugepages (numa_node, log2_page_size, n + needed);
264 : }
265 :
266 : __clib_export uword *
267 1118 : clib_sysfs_list_to_bitmap (char *filename)
268 : {
269 : FILE *fp;
270 1118 : uword *r = 0;
271 :
272 1118 : fp = fopen (filename, "r");
273 :
274 1118 : if (fp != NULL)
275 : {
276 1118 : u8 *buffer = 0;
277 1118 : vec_validate (buffer, 256 - 1);
278 1118 : if (fgets ((char *) buffer, 256, fp))
279 : {
280 : unformat_input_t in;
281 1118 : unformat_init_string (&in, (char *) buffer,
282 1118 : strlen ((char *) buffer));
283 1118 : if (unformat (&in, "%U", unformat_bitmap_list, &r) != 1)
284 0 : clib_warning ("unformat_bitmap_list failed");
285 1118 : unformat_free (&in);
286 : }
287 1118 : vec_free (buffer);
288 1118 : fclose (fp);
289 : }
290 1118 : return r;
291 : }
292 :
293 : /*
294 : * fd.io coding-style-patch-verification: ON
295 : *
296 : * Local Variables:
297 : * eval: (c-set-style "gnu")
298 : * End:
299 : */
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