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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
19adb8a3 ZJS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Zbigniew Jędrzejewski-Szmek | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
a8fbdf54 TA |
21 | #include <errno.h> |
22 | #include <stdbool.h> | |
23 | #include <stddef.h> | |
19adb8a3 | 24 | #include <stdio.h> |
a8fbdf54 TA |
25 | #include <string.h> |
26 | #include <syslog.h> | |
27 | #include <unistd.h> | |
19adb8a3 | 28 | |
b5efdb8a | 29 | #include "alloc-util.h" |
19adb8a3 | 30 | #include "conf-parser.h" |
a0f29c76 | 31 | #include "def.h" |
490d20e6 | 32 | #include "env-util.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
19adb8a3 ZJS |
34 | #include "fileio.h" |
35 | #include "log.h" | |
a8fbdf54 | 36 | #include "macro.h" |
a0f29c76 | 37 | #include "parse-util.h" |
3ffd4af2 | 38 | #include "sleep-config.h" |
07630cea | 39 | #include "string-util.h" |
19adb8a3 | 40 | #include "strv.h" |
19adb8a3 | 41 | |
9ed794a3 | 42 | #define USE(x, y) do { (x) = (y); (y) = NULL; } while (0) |
dabeaa46 ZJS |
43 | |
44 | int parse_sleep_config(const char *verb, char ***_modes, char ***_states) { | |
34c10968 | 45 | |
19adb8a3 ZJS |
46 | _cleanup_strv_free_ char |
47 | **suspend_mode = NULL, **suspend_state = NULL, | |
48 | **hibernate_mode = NULL, **hibernate_state = NULL, | |
49 | **hybrid_mode = NULL, **hybrid_state = NULL; | |
dabeaa46 | 50 | char **modes, **states; |
19adb8a3 ZJS |
51 | |
52 | const ConfigTableItem items[] = { | |
53 | { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode }, | |
54 | { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state }, | |
55 | { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode }, | |
56 | { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state }, | |
57 | { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode }, | |
58 | { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state }, | |
34c10968 LP |
59 | {} |
60 | }; | |
19adb8a3 | 61 | |
bcde742e LP |
62 | (void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf", |
63 | CONF_PATHS_NULSTR("systemd/sleep.conf.d"), | |
64 | "Sleep\0", config_item_table_lookup, items, | |
65 | CONFIG_PARSE_WARN, NULL); | |
19adb8a3 | 66 | |
19adb8a3 ZJS |
67 | if (streq(verb, "suspend")) { |
68 | /* empty by default */ | |
dabeaa46 | 69 | USE(modes, suspend_mode); |
19adb8a3 ZJS |
70 | |
71 | if (suspend_state) | |
dabeaa46 | 72 | USE(states, suspend_state); |
19adb8a3 | 73 | else |
dabeaa46 | 74 | states = strv_new("mem", "standby", "freeze", NULL); |
19adb8a3 | 75 | |
19adb8a3 ZJS |
76 | } else if (streq(verb, "hibernate")) { |
77 | if (hibernate_mode) | |
dabeaa46 | 78 | USE(modes, hibernate_mode); |
19adb8a3 | 79 | else |
dabeaa46 | 80 | modes = strv_new("platform", "shutdown", NULL); |
19adb8a3 ZJS |
81 | |
82 | if (hibernate_state) | |
dabeaa46 | 83 | USE(states, hibernate_state); |
19adb8a3 | 84 | else |
dabeaa46 | 85 | states = strv_new("disk", NULL); |
19adb8a3 | 86 | |
19adb8a3 ZJS |
87 | } else if (streq(verb, "hybrid-sleep")) { |
88 | if (hybrid_mode) | |
dabeaa46 | 89 | USE(modes, hybrid_mode); |
19adb8a3 | 90 | else |
dabeaa46 | 91 | modes = strv_new("suspend", "platform", "shutdown", NULL); |
19adb8a3 ZJS |
92 | |
93 | if (hybrid_state) | |
dabeaa46 | 94 | USE(states, hybrid_state); |
19adb8a3 | 95 | else |
dabeaa46 | 96 | states = strv_new("disk", NULL); |
19adb8a3 | 97 | |
19adb8a3 ZJS |
98 | } else |
99 | assert_not_reached("what verb"); | |
100 | ||
dabeaa46 ZJS |
101 | if ((!modes && !streq(verb, "suspend")) || !states) { |
102 | strv_free(modes); | |
103 | strv_free(states); | |
19adb8a3 ZJS |
104 | return log_oom(); |
105 | } | |
106 | ||
dabeaa46 ZJS |
107 | *_modes = modes; |
108 | *_states = states; | |
19adb8a3 ZJS |
109 | return 0; |
110 | } | |
111 | ||
112 | int can_sleep_state(char **types) { | |
a2a5291b | 113 | char **type; |
19adb8a3 ZJS |
114 | int r; |
115 | _cleanup_free_ char *p = NULL; | |
116 | ||
117 | if (strv_isempty(types)) | |
118 | return true; | |
119 | ||
120 | /* If /sys is read-only we cannot sleep */ | |
121 | if (access("/sys/power/state", W_OK) < 0) | |
122 | return false; | |
123 | ||
124 | r = read_one_line_file("/sys/power/state", &p); | |
125 | if (r < 0) | |
126 | return false; | |
127 | ||
128 | STRV_FOREACH(type, types) { | |
a2a5291b | 129 | const char *word, *state; |
19adb8a3 ZJS |
130 | size_t l, k; |
131 | ||
132 | k = strlen(*type); | |
a2a5291b ZJS |
133 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) |
134 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
135 | return true; |
136 | } | |
137 | ||
138 | return false; | |
139 | } | |
140 | ||
141 | int can_sleep_disk(char **types) { | |
a2a5291b | 142 | char **type; |
19adb8a3 ZJS |
143 | int r; |
144 | _cleanup_free_ char *p = NULL; | |
145 | ||
146 | if (strv_isempty(types)) | |
147 | return true; | |
148 | ||
149 | /* If /sys is read-only we cannot sleep */ | |
150 | if (access("/sys/power/disk", W_OK) < 0) | |
151 | return false; | |
152 | ||
153 | r = read_one_line_file("/sys/power/disk", &p); | |
154 | if (r < 0) | |
155 | return false; | |
156 | ||
157 | STRV_FOREACH(type, types) { | |
a2a5291b | 158 | const char *word, *state; |
19adb8a3 ZJS |
159 | size_t l, k; |
160 | ||
161 | k = strlen(*type); | |
a2a5291b ZJS |
162 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) { |
163 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
164 | return true; |
165 | ||
a2a5291b ZJS |
166 | if (l == k + 2 && |
167 | word[0] == '[' && | |
168 | memcmp(word + 1, *type, l - 2) == 0 && | |
169 | word[l-1] == ']') | |
19adb8a3 ZJS |
170 | return true; |
171 | } | |
172 | } | |
173 | ||
174 | return false; | |
175 | } | |
176 | ||
69ab8088 ZJS |
177 | #define HIBERNATION_SWAP_THRESHOLD 0.98 |
178 | ||
9fb3675e ZJS |
179 | static int hibernation_partition_size(size_t *size, size_t *used) { |
180 | _cleanup_fclose_ FILE *f; | |
1fa2f38f | 181 | unsigned i; |
9fb3675e ZJS |
182 | |
183 | assert(size); | |
184 | assert(used); | |
185 | ||
c8a202b7 | 186 | f = fopen("/proc/swaps", "re"); |
9fb3675e ZJS |
187 | if (!f) { |
188 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
189 | "Failed to retrieve open /proc/swaps: %m"); | |
190 | assert(errno > 0); | |
191 | return -errno; | |
192 | } | |
69ab8088 | 193 | |
9fb3675e ZJS |
194 | (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
195 | ||
196 | for (i = 1;; i++) { | |
db69869f | 197 | _cleanup_free_ char *dev = NULL, *type = NULL; |
9fb3675e ZJS |
198 | size_t size_field, used_field; |
199 | int k; | |
200 | ||
201 | k = fscanf(f, | |
202 | "%ms " /* device/file */ | |
203 | "%ms " /* type of swap */ | |
1fa2f38f ZJS |
204 | "%zu " /* swap size */ |
205 | "%zu " /* used */ | |
9fb3675e ZJS |
206 | "%*i\n", /* priority */ |
207 | &dev, &type, &size_field, &used_field); | |
208 | if (k != 4) { | |
209 | if (k == EOF) | |
210 | break; | |
211 | ||
212 | log_warning("Failed to parse /proc/swaps:%u", i); | |
213 | continue; | |
214 | } | |
215 | ||
db69869f DR |
216 | if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
217 | log_warning("Ignoring deleted swapfile '%s'.", dev); | |
9fb3675e ZJS |
218 | continue; |
219 | } | |
220 | ||
221 | *size = size_field; | |
222 | *used = used_field; | |
223 | return 0; | |
69ab8088 ZJS |
224 | } |
225 | ||
9fb3675e ZJS |
226 | log_debug("No swap partitions were found."); |
227 | return -ENOSYS; | |
228 | } | |
229 | ||
230 | static bool enough_memory_for_hibernation(void) { | |
231 | _cleanup_free_ char *active = NULL; | |
39883f62 LP |
232 | unsigned long long act = 0; |
233 | size_t size = 0, used = 0; | |
9fb3675e ZJS |
234 | int r; |
235 | ||
490d20e6 VV |
236 | if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0) |
237 | return true; | |
238 | ||
9fb3675e ZJS |
239 | r = hibernation_partition_size(&size, &used); |
240 | if (r < 0) | |
69ab8088 | 241 | return false; |
69ab8088 | 242 | |
c4cd1d4d | 243 | r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active); |
69ab8088 | 244 | if (r < 0) { |
da927ba9 | 245 | log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
69ab8088 ZJS |
246 | return false; |
247 | } | |
248 | ||
249 | r = safe_atollu(active, &act); | |
250 | if (r < 0) { | |
c33b3297 MS |
251 | log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", |
252 | active); | |
69ab8088 ZJS |
253 | return false; |
254 | } | |
255 | ||
9fb3675e ZJS |
256 | r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
257 | log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", | |
258 | r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); | |
69ab8088 ZJS |
259 | |
260 | return r; | |
261 | } | |
262 | ||
19adb8a3 ZJS |
263 | int can_sleep(const char *verb) { |
264 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
265 | int r; | |
266 | ||
267 | assert(streq(verb, "suspend") || | |
268 | streq(verb, "hibernate") || | |
269 | streq(verb, "hybrid-sleep")); | |
270 | ||
271 | r = parse_sleep_config(verb, &modes, &states); | |
272 | if (r < 0) | |
273 | return false; | |
274 | ||
69ab8088 ZJS |
275 | if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
276 | return false; | |
277 | ||
278 | return streq(verb, "suspend") || enough_memory_for_hibernation(); | |
19adb8a3 | 279 | } |