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-rw-r--r--src/sleep/sleep.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/src/sleep/sleep.c b/src/sleep/sleep.c
new file mode 100644
index 0000000..95025ed
--- /dev/null
+++ b/src/sleep/sleep.c
@@ -0,0 +1,578 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+ Copyright © 2010-2017 Canonical
+ Copyright © 2018 Dell Inc.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <linux/fiemap.h>
+#include <poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/timerfd.h>
+#include <unistd.h>
+
+#include "sd-bus.h"
+#include "sd-messages.h"
+
+#include "btrfs-util.h"
+#include "bus-error.h"
+#include "bus-locator.h"
+#include "bus-util.h"
+#include "def.h"
+#include "efivars.h"
+#include "exec-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "io-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "sleep-config.h"
+#include "special.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "time-util.h"
+#include "util.h"
+
+#define DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY (2 * USEC_PER_HOUR)
+
+static SleepOperation arg_operation = _SLEEP_OPERATION_INVALID;
+
+static int write_hibernate_location_info(const HibernateLocation *hibernate_location) {
+ char offset_str[DECIMAL_STR_MAX(uint64_t)];
+ char resume_str[DECIMAL_STR_MAX(unsigned) * 2 + STRLEN(":")];
+ int r;
+
+ assert(hibernate_location);
+ assert(hibernate_location->swap);
+
+ xsprintf(resume_str, "%u:%u", major(hibernate_location->devno), minor(hibernate_location->devno));
+ r = write_string_file("/sys/power/resume", resume_str, WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to write partition device to /sys/power/resume for '%s': '%s': %m",
+ hibernate_location->swap->device, resume_str);
+
+ log_debug("Wrote resume= value for %s to /sys/power/resume: %s", hibernate_location->swap->device, resume_str);
+
+ /* if it's a swap partition, we're done */
+ if (streq(hibernate_location->swap->type, "partition"))
+ return r;
+
+ if (!streq(hibernate_location->swap->type, "file"))
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Invalid hibernate type: %s", hibernate_location->swap->type);
+
+ /* Only available in 4.17+ */
+ if (hibernate_location->offset > 0 && access("/sys/power/resume_offset", W_OK) < 0) {
+ if (errno == ENOENT) {
+ log_debug("Kernel too old, can't configure resume_offset for %s, ignoring: %" PRIu64,
+ hibernate_location->swap->device, hibernate_location->offset);
+ return 0;
+ }
+
+ return log_debug_errno(errno, "/sys/power/resume_offset not writable: %m");
+ }
+
+ xsprintf(offset_str, "%" PRIu64, hibernate_location->offset);
+ r = write_string_file("/sys/power/resume_offset", offset_str, WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to write swap file offset to /sys/power/resume_offset for '%s': '%s': %m",
+ hibernate_location->swap->device, offset_str);
+
+ log_debug("Wrote resume_offset= value for %s to /sys/power/resume_offset: %s", hibernate_location->swap->device, offset_str);
+
+ return 0;
+}
+
+static int write_mode(char **modes) {
+ int r = 0;
+
+ STRV_FOREACH(mode, modes) {
+ int k;
+
+ k = write_string_file("/sys/power/disk", *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (k >= 0)
+ return 0;
+
+ log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", *mode);
+ if (r >= 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int write_state(FILE **f, char **states) {
+ int r = 0;
+
+ assert(f);
+ assert(*f);
+
+ STRV_FOREACH(state, states) {
+ int k;
+
+ k = write_string_stream(*f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (k >= 0)
+ return 0;
+ log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state);
+ if (r >= 0)
+ r = k;
+
+ fclose(*f);
+ *f = fopen("/sys/power/state", "we");
+ if (!*f)
+ return -errno;
+ }
+
+ return r;
+}
+
+static int lock_all_homes(void) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ int r;
+
+ /* Let's synchronously lock all home directories managed by homed that have been marked for it. This
+ * way the key material required to access these volumes is hopefully removed from memory. */
+
+ r = sd_bus_open_system(&bus);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to connect to system bus, ignoring: %m");
+
+ r = sd_bus_message_new_method_call(
+ bus,
+ &m,
+ "org.freedesktop.home1",
+ "/org/freedesktop/home1",
+ "org.freedesktop.home1.Manager",
+ "LockAllHomes");
+ if (r < 0)
+ return bus_log_create_error(r);
+
+ /* If homed is not running it can't have any home directories active either. */
+ r = sd_bus_message_set_auto_start(m, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m");
+
+ r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL);
+ if (r < 0) {
+ if (!bus_error_is_unknown_service(&error))
+ return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r));
+
+ log_debug("systemd-homed is not running, locking of home directories skipped.");
+ } else
+ log_debug("Successfully requested locking of all home directories.");
+ return 0;
+}
+
+static int execute(
+ const SleepConfig *sleep_config,
+ SleepOperation operation,
+ const char *action) {
+
+ char *arguments[] = {
+ NULL,
+ (char*) "pre",
+ /* NB: we use 'arg_operation' instead of 'operation' here, as we want to communicate the overall
+ * operation here, not the specific one, in case of s2h. */
+ (char*) sleep_operation_to_string(arg_operation),
+ NULL
+ };
+ static const char* const dirs[] = {
+ SYSTEM_SLEEP_PATH,
+ NULL
+ };
+
+ _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ char **modes, **states;
+ int r;
+
+ assert(sleep_config);
+ assert(operation >= 0);
+ assert(operation < _SLEEP_OPERATION_MAX);
+ assert(operation != SLEEP_SUSPEND_THEN_HIBERNATE); /* Handled by execute_s2h() instead */
+
+ states = sleep_config->states[operation];
+ modes = sleep_config->modes[operation];
+
+ if (strv_isempty(states))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "No sleep states configured for sleep operation %s, can't sleep.",
+ sleep_operation_to_string(operation));
+
+ /* This file is opened first, so that if we hit an error,
+ * we can abort before modifying any state. */
+ f = fopen("/sys/power/state", "we");
+ if (!f)
+ return log_error_errno(errno, "Failed to open /sys/power/state: %m");
+
+ setvbuf(f, NULL, _IONBF, 0);
+
+ /* Configure hibernation settings if we are supposed to hibernate */
+ if (!strv_isempty(modes)) {
+ r = find_hibernate_location(&hibernate_location);
+ if (r < 0)
+ return log_error_errno(r, "Failed to find location to hibernate to: %m");
+ if (r == 0) { /* 0 means: no hibernation location was configured in the kernel so far, let's
+ * do it ourselves then. > 0 means: kernel already had a configured hibernation
+ * location which we shouldn't touch. */
+ r = write_hibernate_location_info(hibernate_location);
+ if (r < 0) {
+ if (is_efi_boot())
+ (void) efi_set_variable(EFI_SYSTEMD_VARIABLE(HibernateLocation), NULL, 0);
+
+ return log_error_errno(r, "Failed to prepare for hibernation: %m");
+ }
+ }
+
+ r = write_mode(modes);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
+ }
+
+ /* Pass an action string to the call-outs. This is mostly our operation string, except if the
+ * hibernate step of s-t-h fails, in which case we communicate that with a separate action. */
+ if (!action)
+ action = sleep_operation_to_string(operation);
+
+ r = setenv("SYSTEMD_SLEEP_ACTION", action, 1);
+ if (r != 0)
+ log_warning_errno(errno, "Error setting SYSTEMD_SLEEP_ACTION=%s, ignoring: %m", action);
+
+ (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
+ (void) lock_all_homes();
+
+ log_struct(LOG_INFO,
+ "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
+ LOG_MESSAGE("Entering sleep state '%s'...", sleep_operation_to_string(operation)),
+ "SLEEP=%s", sleep_operation_to_string(arg_operation));
+
+ r = write_state(&f, states);
+ if (r < 0)
+ log_struct_errno(LOG_ERR, r,
+ "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
+ LOG_MESSAGE("Failed to put system to sleep. System resumed again: %m"),
+ "SLEEP=%s", sleep_operation_to_string(arg_operation));
+ else
+ log_struct(LOG_INFO,
+ "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
+ LOG_MESSAGE("System returned from sleep state."),
+ "SLEEP=%s", sleep_operation_to_string(arg_operation));
+
+ arguments[1] = (char*) "post";
+ (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
+
+ return r;
+}
+
+static int custom_timer_suspend(const SleepConfig *sleep_config) {
+ usec_t hibernate_timestamp;
+ int r;
+
+ assert(sleep_config);
+
+ hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
+
+ while (battery_is_discharging_and_low() == 0) {
+ _cleanup_hashmap_free_ Hashmap *last_capacity = NULL, *current_capacity = NULL;
+ _cleanup_close_ int tfd = -1;
+ struct itimerspec ts = {};
+ usec_t suspend_interval;
+ bool woken_by_timer;
+
+ tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (tfd < 0)
+ return log_error_errno(errno, "Error creating timerfd: %m");
+
+ /* Store current battery capacity before suspension */
+ r = fetch_batteries_capacity_by_name(&last_capacity);
+ if (r < 0)
+ return log_error_errno(r, "Error fetching battery capacity percentage: %m");
+
+ if (hashmap_isempty(last_capacity))
+ /* In case of no battery, system suspend interval will be set to HibernateDelaySec= or 2 hours. */
+ suspend_interval = timestamp_is_set(hibernate_timestamp)
+ ? sleep_config->hibernate_delay_usec : DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY;
+ else {
+ r = get_total_suspend_interval(last_capacity, &suspend_interval);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to estimate suspend interval using previous discharge rate, ignoring: %m");
+ /* In case of any errors, especially when we do not know the battery
+ * discharging rate, system suspend interval will be set to
+ * SuspendEstimationSec=. */
+ suspend_interval = sleep_config->suspend_estimation_usec;
+ }
+ }
+
+ /* Do not suspend more than HibernateDelaySec= */
+ usec_t before_timestamp = now(CLOCK_BOOTTIME);
+ suspend_interval = MIN(suspend_interval, usec_sub_unsigned(hibernate_timestamp, before_timestamp));
+ if (suspend_interval <= 0)
+ break; /* system should hibernate */
+
+ log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
+ /* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */
+ timespec_store(&ts.it_value, suspend_interval);
+
+ if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
+ return log_error_errno(errno, "Error setting battery estimate timer: %m");
+
+ r = execute(sleep_config, SLEEP_SUSPEND, NULL);
+ if (r < 0)
+ return r;
+
+ r = fd_wait_for_event(tfd, POLLIN, 0);
+ if (r < 0)
+ return log_error_errno(r, "Error polling timerfd: %m");
+ /* Store fd_wait status */
+ woken_by_timer = FLAGS_SET(r, POLLIN);
+
+ r = fetch_batteries_capacity_by_name(&current_capacity);
+ if (r < 0 || hashmap_isempty(current_capacity)) {
+ /* In case of no battery or error while getting charge level, no need to measure
+ * discharge rate. Instead the system should wake up if it is manual wakeup or
+ * hibernate if this is a timer wakeup. */
+ if (r < 0)
+ log_debug_errno(r, "Battery capacity percentage unavailable, cannot estimate discharge rate: %m");
+ else
+ log_debug("No battery found.");
+ if (!woken_by_timer)
+ return 0;
+ break;
+ }
+
+ usec_t after_timestamp = now(CLOCK_BOOTTIME);
+ log_debug("Attempting to estimate battery discharge rate after wakeup from %s sleep",
+ FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_HOUR));
+
+ if (after_timestamp != before_timestamp) {
+ r = estimate_battery_discharge_rate_per_hour(last_capacity, current_capacity, before_timestamp, after_timestamp);
+ if (r < 0)
+ log_warning_errno(r, "Failed to estimate and update battery discharge rate, ignoring: %m");
+ } else
+ log_debug("System woke up too early to estimate discharge rate");
+
+ if (!woken_by_timer)
+ /* Return as manual wakeup done. This also will return in case battery was charged during suspension */
+ return 0;
+
+ r = check_wakeup_type();
+ if (r < 0)
+ log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
+ if (r > 0) {
+ log_debug("wakeup type is APM timer");
+ /* system should hibernate */
+ break;
+ }
+ }
+
+ return 1;
+}
+
+/* Freeze when invoked and thaw on cleanup */
+static int freeze_thaw_user_slice(const char **method) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ int r;
+
+ if (!method || !*method)
+ return 0;
+
+ r = bus_connect_system_systemd(&bus);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to open connection to systemd: %m");
+
+ /* Wait for 1.5 seconds at maximum for freeze operation */
+ (void) sd_bus_set_method_call_timeout(bus, 1500 * USEC_PER_MSEC);
+
+ r = bus_call_method(bus, bus_systemd_mgr, *method, &error, NULL, "s", SPECIAL_USER_SLICE);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
+
+ return 1;
+}
+
+static int execute_s2h(const SleepConfig *sleep_config) {
+ _unused_ _cleanup_(freeze_thaw_user_slice) const char *auto_method_thaw = "ThawUnit";
+ int r;
+
+ assert(sleep_config);
+
+ r = freeze_thaw_user_slice(&(const char*) { "FreezeUnit" });
+ if (r < 0)
+ log_debug_errno(r, "Failed to freeze unit user.slice, ignoring: %m");
+
+ /* Only check if we have automated battery alarms if HibernateDelaySec= is not set, as in that case
+ * we'll busy poll for the configured interval instead */
+ if (!timestamp_is_set(sleep_config->hibernate_delay_usec)) {
+ r = check_wakeup_type();
+ if (r < 0)
+ log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
+ else {
+ r = battery_trip_point_alarm_exists();
+ if (r < 0)
+ log_debug_errno(r, "Failed to check whether acpi_btp support is enabled or not, ignoring: %m");
+ }
+ } else
+ r = 0; /* Force fallback path */
+
+ if (r > 0) { /* If we have both wakeup alarms and battery trip point support, use them */
+ log_debug("Attempting to suspend...");
+ r = execute(sleep_config, SLEEP_SUSPEND, NULL);
+ if (r < 0)
+ return r;
+
+ r = check_wakeup_type();
+ if (r < 0)
+ return log_debug_errno(r, "Failed to check hardware wakeup type: %m");
+
+ if (r == 0)
+ /* For APM Timer wakeup, system should hibernate else wakeup */
+ return 0;
+ } else {
+ r = custom_timer_suspend(sleep_config);
+ if (r < 0)
+ return log_debug_errno(r, "Suspend cycle with manual battery discharge rate estimation failed: %m");
+ if (r == 0)
+ /* manual wakeup */
+ return 0;
+ }
+ /* For above custom timer, if 1 is returned, system will directly hibernate */
+
+ log_debug("Attempting to hibernate");
+ r = execute(sleep_config, SLEEP_HIBERNATE, NULL);
+ if (r < 0) {
+ log_notice("Couldn't hibernate, will try to suspend again.");
+
+ r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hibernate");
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-suspend.service", "8", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s COMMAND\n\n"
+ "Suspend the system, hibernate the system, or both.\n\n"
+ " -h --help Show this help and exit\n"
+ " --version Print version string and exit\n"
+ "\nCommands:\n"
+ " suspend Suspend the system\n"
+ " hibernate Hibernate the system\n"
+ " hybrid-sleep Both hibernate and suspend the system\n"
+ " suspend-then-hibernate Initially suspend and then hibernate\n"
+ " the system after a fixed period of time\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_VERSION = 0x100,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+ switch (c) {
+ case 'h':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ if (argc - optind != 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Usage: %s COMMAND",
+ program_invocation_short_name);
+
+ arg_operation = sleep_operation_from_string(argv[optind]);
+ if (arg_operation < 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command '%s'.", argv[optind]);
+
+ return 1 /* work to do */;
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL;
+ int r;
+
+ log_setup();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ r = parse_sleep_config(&sleep_config);
+ if (r < 0)
+ return r;
+
+ if (!sleep_config->allow[arg_operation])
+ return log_error_errno(SYNTHETIC_ERRNO(EACCES),
+ "Sleep operation \"%s\" is disabled by configuration, refusing.",
+ sleep_operation_to_string(arg_operation));
+
+ switch (arg_operation) {
+
+ case SLEEP_SUSPEND_THEN_HIBERNATE:
+ r = execute_s2h(sleep_config);
+ break;
+
+ case SLEEP_HYBRID_SLEEP:
+ r = execute(sleep_config, SLEEP_HYBRID_SLEEP, NULL);
+ if (r < 0) {
+ /* If we can't hybrid sleep, then let's try to suspend at least. After all, the user
+ * asked us to do both: suspend + hibernate, and it's almost certainly the
+ * hibernation that failed, hence still do the other thing, the suspend. */
+
+ log_notice("Couldn't hybrid sleep, will try to suspend instead.");
+
+ r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hybrid-sleep");
+ }
+
+ break;
+
+ default:
+ r = execute(sleep_config, arg_operation, NULL);
+ break;
+ }
+
+ return r;
+}
+
+DEFINE_MAIN_FUNCTION(run);