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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 #include <vppinfra/clib.h>
17 #include <vppinfra/clib_error.h>
18 #include <vppinfra/format.h>
20 #include <sys/types.h>
26 clib_sysfs_write (char *file_name, char *fmt, ...)
30 clib_error_t *error = 0;
32 fd = open (file_name, O_WRONLY);
34 return clib_error_return_unix (0, "open `%s'", file_name);
38 s = va_format (0, fmt, &va);
41 if (write (fd, s, vec_len (s)) < 0)
42 error = clib_error_return_unix (0, "write `%s'", file_name);
50 clib_sysfs_read (char *file_name, char *fmt, ...)
52 unformat_input_t input;
58 fd = open (file_name, O_RDONLY);
60 return clib_error_return_unix (0, "open `%s'", file_name);
62 vec_validate (s, 4095);
64 sz = read (fd, s, vec_len (s));
69 return clib_error_return_unix (0, "read `%s'", file_name);
73 unformat_init_vector (&input, s);
77 result = va_unformat (&input, fmt, &va);
84 return clib_error_return (0, "unformat error");
90 clib_sysfs_link_to_name (char *link)
97 r = readlink (link, buffer, sizeof (buffer) - 1);
103 p = strrchr (buffer, '/');
108 unformat_init_string (&in, p + 1, strlen (p + 1));
109 if (unformat (&in, "%s", &s) != 1)
110 clib_unix_warning ("no string?");
117 clib_sysfs_set_nr_hugepages (int numa_node, int page_size, int nr)
119 clib_error_t *error = 0;
123 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
125 if (stat ((char *) p, &sb) == 0)
127 if (S_ISDIR (sb.st_mode) == 0)
129 error = clib_error_return (0, "'%s' is not directory", p);
133 else if (numa_node == 0)
135 vec_reset_length (p);
136 p = format (p, "/sys/kernel/mm%c", 0);
137 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
139 error = clib_error_return (0, "'%s' does not exist or it is not "
146 error = clib_error_return (0, "'%s' does not exist", p);
151 p = format (p, "/hugepages/hugepages-%ukB/nr_hugepages%c", page_size, 0);
152 clib_sysfs_write ((char *) p, "%d", nr);
160 static clib_error_t *
161 clib_sysfs_get_xxx_hugepages (char *type, int numa_node,
162 int page_size, int *val)
164 clib_error_t *error = 0;
168 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
170 if (stat ((char *) p, &sb) == 0)
172 if (S_ISDIR (sb.st_mode) == 0)
174 error = clib_error_return (0, "'%s' is not directory", p);
178 else if (numa_node == 0)
180 vec_reset_length (p);
181 p = format (p, "/sys/kernel/mm%c", 0);
182 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
184 error = clib_error_return (0, "'%s' does not exist or it is not "
191 error = clib_error_return (0, "'%s' does not exist", p);
196 p = format (p, "/hugepages/hugepages-%ukB/%s_hugepages%c", page_size,
198 error = clib_sysfs_read ((char *) p, "%d", val);
206 clib_sysfs_get_free_hugepages (int numa_node, int page_size, int *v)
208 return clib_sysfs_get_xxx_hugepages ("free", numa_node, page_size, v);
212 clib_sysfs_get_nr_hugepages (int numa_node, int page_size, int *v)
214 return clib_sysfs_get_xxx_hugepages ("nr", numa_node, page_size, v);
218 clib_sysfs_get_surplus_hugepages (int numa_node, int page_size, int *v)
220 return clib_sysfs_get_xxx_hugepages ("surplus", numa_node, page_size, v);
224 clib_sysfs_prealloc_hugepages (int numa_node, int page_size, int nr)
226 clib_error_t *error = 0;
228 error = clib_sysfs_get_free_hugepages (numa_node, page_size, &n);
235 error = clib_sysfs_get_nr_hugepages (numa_node, page_size, &n);
238 clib_warning ("pre-allocating %u additional %uK hugepages on numa node %u",
239 needed, page_size, numa_node);
240 return clib_sysfs_set_nr_hugepages (numa_node, page_size, n + needed);
245 * fd.io coding-style-patch-verification: ON
248 * eval: (c-set-style "gnu")