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 log2_page_size, int nr)
119 clib_error_t *error = 0;
124 if (log2_page_size == 0)
125 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
127 page_size = 1ULL << (log2_page_size - 10);
129 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
131 if (stat ((char *) p, &sb) == 0)
133 if (S_ISDIR (sb.st_mode) == 0)
135 error = clib_error_return (0, "'%s' is not directory", p);
139 else if (numa_node == 0)
141 vec_reset_length (p);
142 p = format (p, "/sys/kernel/mm%c", 0);
143 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
145 error = clib_error_return (0, "'%s' does not exist or it is not "
152 error = clib_error_return (0, "'%s' does not exist", p);
157 p = format (p, "/hugepages/hugepages-%ukB/nr_hugepages%c", page_size, 0);
158 clib_sysfs_write ((char *) p, "%d", nr);
166 static clib_error_t *
167 clib_sysfs_get_xxx_hugepages (char *type, int numa_node,
168 int log2_page_size, int *val)
170 clib_error_t *error = 0;
176 if (log2_page_size == 0)
177 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
179 page_size = 1ULL << (log2_page_size - 10);
182 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
184 if (stat ((char *) p, &sb) == 0)
186 if (S_ISDIR (sb.st_mode) == 0)
188 error = clib_error_return (0, "'%s' is not directory", p);
192 else if (numa_node == 0)
194 vec_reset_length (p);
195 p = format (p, "/sys/kernel/mm%c", 0);
196 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
198 error = clib_error_return (0, "'%s' does not exist or it is not "
205 error = clib_error_return (0, "'%s' does not exist", p);
210 p = format (p, "/hugepages/hugepages-%ukB/%s_hugepages%c", page_size,
212 error = clib_sysfs_read ((char *) p, "%d", val);
220 clib_sysfs_get_free_hugepages (int numa_node, int log2_page_size, int *v)
222 return clib_sysfs_get_xxx_hugepages ("free", numa_node, log2_page_size, v);
226 clib_sysfs_get_nr_hugepages (int numa_node, int log2_page_size, int *v)
228 return clib_sysfs_get_xxx_hugepages ("nr", numa_node, log2_page_size, v);
232 clib_sysfs_get_surplus_hugepages (int numa_node, int log2_page_size, int *v)
234 return clib_sysfs_get_xxx_hugepages ("surplus", numa_node, log2_page_size,
239 clib_sysfs_prealloc_hugepages (int numa_node, int log2_page_size, int nr)
241 clib_error_t *error = 0;
245 if (log2_page_size == 0)
246 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
248 page_size = 1ULL << (log2_page_size - 10);
250 error = clib_sysfs_get_free_hugepages (numa_node, log2_page_size, &n);
257 error = clib_sysfs_get_nr_hugepages (numa_node, log2_page_size, &n);
260 clib_warning ("pre-allocating %u additional %uK hugepages on numa node %u",
261 needed, page_size, numa_node);
262 return clib_sysfs_set_nr_hugepages (numa_node, log2_page_size, n + needed);
267 * fd.io coding-style-patch-verification: ON
270 * eval: (c-set-style "gnu")