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>
19 #include <vppinfra/bitmap.h>
21 #include <sys/types.h>
26 __clib_export clib_error_t *
27 clib_sysfs_write (char *file_name, char *fmt, ...)
31 clib_error_t *error = 0;
33 fd = open (file_name, O_WRONLY);
35 return clib_error_return_unix (0, "open `%s'", file_name);
39 s = va_format (0, fmt, &va);
42 if (write (fd, s, vec_len (s)) < 0)
43 error = clib_error_return_unix (0, "write `%s'", file_name);
50 __clib_export clib_error_t *
51 clib_sysfs_read (char *file_name, char *fmt, ...)
53 unformat_input_t input;
59 fd = open (file_name, O_RDONLY);
61 return clib_error_return_unix (0, "open `%s'", file_name);
63 vec_validate (s, 4095);
65 sz = read (fd, s, vec_len (s));
70 return clib_error_return_unix (0, "read `%s'", file_name);
74 unformat_init_vector (&input, s);
78 result = va_unformat (&input, fmt, &va);
85 return clib_error_return (0, "unformat error");
91 clib_sysfs_link_to_name (char *link)
98 r = readlink (link, buffer, sizeof (buffer) - 1);
104 p = strrchr (buffer, '/');
109 unformat_init_string (&in, p + 1, strlen (p + 1));
110 if (unformat (&in, "%s", &s) != 1)
111 clib_unix_warning ("no string?");
118 clib_sysfs_set_nr_hugepages (int numa_node, int log2_page_size, int nr)
120 clib_error_t *error = 0;
125 if (log2_page_size == 0)
126 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
128 page_size = 1ULL << (log2_page_size - 10);
130 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
132 if (stat ((char *) p, &sb) == 0)
134 if (S_ISDIR (sb.st_mode) == 0)
136 error = clib_error_return (0, "'%s' is not directory", p);
140 else if (numa_node == 0)
142 vec_reset_length (p);
143 p = format (p, "/sys/kernel/mm%c", 0);
144 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
146 error = clib_error_return (0, "'%s' does not exist or it is not "
153 error = clib_error_return (0, "'%s' does not exist", p);
158 p = format (p, "/hugepages/hugepages-%ukB/nr_hugepages%c", page_size, 0);
159 clib_sysfs_write ((char *) p, "%d", nr);
167 static clib_error_t *
168 clib_sysfs_get_xxx_hugepages (char *type, int numa_node,
169 int log2_page_size, int *val)
171 clib_error_t *error = 0;
177 if (log2_page_size == 0)
178 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
180 page_size = 1ULL << (log2_page_size - 10);
183 p = format (p, "/sys/devices/system/node/node%u%c", numa_node, 0);
185 if (stat ((char *) p, &sb) == 0)
187 if (S_ISDIR (sb.st_mode) == 0)
189 error = clib_error_return (0, "'%s' is not directory", p);
193 else if (numa_node == 0)
195 vec_reset_length (p);
196 p = format (p, "/sys/kernel/mm%c", 0);
197 if (stat ((char *) p, &sb) < 0 || S_ISDIR (sb.st_mode) == 0)
199 error = clib_error_return (0, "'%s' does not exist or it is not "
206 error = clib_error_return (0, "'%s' does not exist", p);
211 p = format (p, "/hugepages/hugepages-%ukB/%s_hugepages%c", page_size,
213 error = clib_sysfs_read ((char *) p, "%d", val);
221 clib_sysfs_get_free_hugepages (int numa_node, int log2_page_size, int *v)
223 return clib_sysfs_get_xxx_hugepages ("free", numa_node, log2_page_size, v);
227 clib_sysfs_get_nr_hugepages (int numa_node, int log2_page_size, int *v)
229 return clib_sysfs_get_xxx_hugepages ("nr", numa_node, log2_page_size, v);
233 clib_sysfs_get_surplus_hugepages (int numa_node, int log2_page_size, int *v)
235 return clib_sysfs_get_xxx_hugepages ("surplus", numa_node, log2_page_size,
240 clib_sysfs_prealloc_hugepages (int numa_node, int log2_page_size, int nr)
242 clib_error_t *error = 0;
246 if (log2_page_size == 0)
247 log2_page_size = min_log2 (clib_mem_get_default_hugepage_size ());
249 page_size = 1ULL << (log2_page_size - 10);
251 error = clib_sysfs_get_free_hugepages (numa_node, log2_page_size, &n);
258 error = clib_sysfs_get_nr_hugepages (numa_node, log2_page_size, &n);
261 clib_warning ("pre-allocating %u additional %uK hugepages on numa node %u",
262 needed, page_size, numa_node);
263 return clib_sysfs_set_nr_hugepages (numa_node, log2_page_size, n + needed);
266 __clib_export uword *
267 clib_sysfs_list_to_bitmap (char *filename)
272 fp = fopen (filename, "r");
277 vec_validate (buffer, 256 - 1);
278 if (fgets ((char *) buffer, 256, fp))
281 unformat_init_string (&in, (char *) buffer,
282 strlen ((char *) buffer));
283 if (unformat (&in, "%U", unformat_bitmap_list, &r) != 1)
284 clib_warning ("unformat_bitmap_list failed");
294 * fd.io coding-style-patch-verification: ON
297 * eval: (c-set-style "gnu")