315 lines
10 KiB
C
315 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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Copyright 2018 Dell Inc.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "def.h"
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#include "env-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "sleep-config.h"
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#include "string-util.h"
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#include "strv.h"
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int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t *_delay) {
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_cleanup_strv_free_ char
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**suspend_mode = NULL, **suspend_state = NULL,
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**hibernate_mode = NULL, **hibernate_state = NULL,
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**hybrid_mode = NULL, **hybrid_state = NULL;
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char **modes, **states;
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usec_t delay = 180 * USEC_PER_MINUTE;
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const ConfigTableItem items[] = {
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{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
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{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
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{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
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{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
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{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
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{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
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{ "Sleep", "HibernateDelaySec", config_parse_sec, 0, &delay},
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{}
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};
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(void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf",
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CONF_PATHS_NULSTR("systemd/sleep.conf.d"),
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"Sleep\0", config_item_table_lookup, items,
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CONFIG_PARSE_WARN, NULL);
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if (streq(verb, "suspend")) {
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/* empty by default */
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modes = TAKE_PTR(suspend_mode);
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if (suspend_state)
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states = TAKE_PTR(suspend_state);
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else
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states = strv_new("mem", "standby", "freeze", NULL);
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} else if (streq(verb, "hibernate")) {
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if (hibernate_mode)
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modes = TAKE_PTR(hibernate_mode);
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else
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modes = strv_new("platform", "shutdown", NULL);
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if (hibernate_state)
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states = TAKE_PTR(hibernate_state);
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else
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states = strv_new("disk", NULL);
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} else if (streq(verb, "hybrid-sleep")) {
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if (hybrid_mode)
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modes = TAKE_PTR(hybrid_mode);
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else
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modes = strv_new("suspend", "platform", "shutdown", NULL);
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if (hybrid_state)
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states = TAKE_PTR(hybrid_state);
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else
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states = strv_new("disk", NULL);
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} else if (streq(verb, "suspend-to-hibernate"))
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modes = states = NULL;
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else
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assert_not_reached("what verb");
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if ((!modes && STR_IN_SET(verb, "hibernate", "hybrid-sleep")) ||
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(!states && !streq(verb, "suspend-to-hibernate"))) {
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strv_free(modes);
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strv_free(states);
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return log_oom();
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}
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if (_modes)
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*_modes = modes;
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if (_states)
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*_states = states;
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if (_delay)
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*_delay = delay;
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return 0;
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}
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int can_sleep_state(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/state", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/state", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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}
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return false;
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}
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int can_sleep_disk(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/disk", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/disk", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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if (l == k + 2 &&
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word[0] == '[' &&
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memcmp(word + 1, *type, l - 2) == 0 &&
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word[l-1] == ']')
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return true;
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}
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}
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return false;
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}
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#define HIBERNATION_SWAP_THRESHOLD 0.98
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static int hibernation_partition_size(size_t *size, size_t *used) {
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_cleanup_fclose_ FILE *f;
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unsigned i;
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assert(size);
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assert(used);
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f = fopen("/proc/swaps", "re");
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if (!f) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"Failed to retrieve open /proc/swaps: %m");
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assert(errno > 0);
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return -errno;
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}
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(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
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for (i = 1;; i++) {
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_cleanup_free_ char *dev = NULL, *type = NULL;
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size_t size_field, used_field;
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int k;
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k = fscanf(f,
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"%ms " /* device/file */
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"%ms " /* type of swap */
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"%zu " /* swap size */
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"%zu " /* used */
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"%*i\n", /* priority */
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&dev, &type, &size_field, &used_field);
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if (k != 4) {
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if (k == EOF)
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break;
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log_warning("Failed to parse /proc/swaps:%u", i);
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continue;
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}
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if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
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log_warning("Ignoring deleted swapfile '%s'.", dev);
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continue;
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}
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*size = size_field;
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*used = used_field;
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return 0;
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}
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log_debug("No swap partitions were found.");
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return -ENOSYS;
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}
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static bool enough_memory_for_hibernation(void) {
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_cleanup_free_ char *active = NULL;
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unsigned long long act = 0;
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size_t size = 0, used = 0;
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int r;
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if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
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return true;
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r = hibernation_partition_size(&size, &used);
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if (r < 0)
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return false;
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r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active);
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if (r < 0) {
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log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
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return false;
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}
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r = safe_atollu(active, &act);
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if (r < 0) {
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log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
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active);
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return false;
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}
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r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
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log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
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r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
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return r;
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}
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static bool can_s2h(void) {
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int r;
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r = access("/sys/class/rtc/rtc0/wakealarm", W_OK);
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if (r < 0) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"/sys/class/rct/rct0/wakealarm is not writable %m");
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return false;
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}
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r = can_sleep("suspend");
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if (r < 0) {
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log_debug_errno(r, "Unable to suspend system.");
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return false;
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}
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r = can_sleep("hibernate");
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if (r < 0) {
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log_debug_errno(r, "Unable to hibernate system.");
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return false;
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}
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return true;
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}
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int can_sleep(const char *verb) {
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_cleanup_strv_free_ char **modes = NULL, **states = NULL;
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int r;
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assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-to-hibernate"));
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if (streq(verb, "suspend-to-hibernate"))
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return can_s2h();
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r = parse_sleep_config(verb, &modes, &states, NULL);
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if (r < 0)
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return false;
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if (!can_sleep_state(states) || !can_sleep_disk(modes))
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return false;
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return streq(verb, "suspend") || enough_memory_for_hibernation();
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}
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