![Huang Ying](/assets/img/avatar_default.png)
Lower device sleep state can save more power, but has more exit latency too. Sometimes, to satisfy some power QoS and other requirement, we need to constrain the lowest device sleep state. In this patch, a parameter to specify lowest allowed state for acpi_pm_device_sleep_state is added. So that the caller can enforce the constraint via the parameter. This is needed by PCIe D3cold support, where the lowest power state allowed may be D3_HOT instead of default D3_COLD. CC: Len Brown <lenb@kernel.org> CC: linux-acpi@vger.kernel.org Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
983 lines
26 KiB
C
983 lines
26 KiB
C
/*
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* sleep.c - ACPI sleep support.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2000-2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2.
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*
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*/
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/dmi.h>
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include "internal.h"
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#include "sleep.h"
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u8 wake_sleep_flags = ACPI_NO_OPTIONAL_METHODS;
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static unsigned int gts, bfs;
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static int set_param_wake_flag(const char *val, struct kernel_param *kp)
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{
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int ret = param_set_int(val, kp);
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if (ret)
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return ret;
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if (kp->arg == (const char *)>s) {
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if (gts)
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wake_sleep_flags |= ACPI_EXECUTE_GTS;
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else
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wake_sleep_flags &= ~ACPI_EXECUTE_GTS;
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}
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if (kp->arg == (const char *)&bfs) {
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if (bfs)
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wake_sleep_flags |= ACPI_EXECUTE_BFS;
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else
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wake_sleep_flags &= ~ACPI_EXECUTE_BFS;
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}
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return ret;
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}
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module_param_call(gts, set_param_wake_flag, param_get_int, >s, 0644);
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module_param_call(bfs, set_param_wake_flag, param_get_int, &bfs, 0644);
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MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
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MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
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static u8 sleep_states[ACPI_S_STATE_COUNT];
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static bool pwr_btn_event_pending;
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static void acpi_sleep_tts_switch(u32 acpi_state)
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{
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union acpi_object in_arg = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &in_arg };
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acpi_status status = AE_OK;
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in_arg.integer.value = acpi_state;
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status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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/*
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* OS can't evaluate the _TTS object correctly. Some warning
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* message will be printed. But it won't break anything.
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*/
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printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
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}
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}
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static int tts_notify_reboot(struct notifier_block *this,
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unsigned long code, void *x)
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{
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acpi_sleep_tts_switch(ACPI_STATE_S5);
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return NOTIFY_DONE;
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}
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static struct notifier_block tts_notifier = {
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.notifier_call = tts_notify_reboot,
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.next = NULL,
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.priority = 0,
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};
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static int acpi_sleep_prepare(u32 acpi_state)
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{
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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if (acpi_state == ACPI_STATE_S3) {
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if (!acpi_wakeup_address)
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return -EFAULT;
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acpi_set_firmware_waking_vector(acpi_wakeup_address);
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}
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ACPI_FLUSH_CPU_CACHE();
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#endif
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printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
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acpi_state);
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acpi_enable_wakeup_devices(acpi_state);
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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#ifdef CONFIG_ACPI_SLEEP
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static u32 acpi_target_sleep_state = ACPI_STATE_S0;
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/*
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* The ACPI specification wants us to save NVS memory regions during hibernation
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* and to restore them during the subsequent resume. Windows does that also for
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* suspend to RAM. However, it is known that this mechanism does not work on
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* all machines, so we allow the user to disable it with the help of the
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* 'acpi_sleep=nonvs' kernel command line option.
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*/
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static bool nvs_nosave;
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void __init acpi_nvs_nosave(void)
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{
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nvs_nosave = true;
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}
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/*
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* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
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* user to request that behavior by using the 'acpi_old_suspend_ordering'
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* kernel command line option that causes the following variable to be set.
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*/
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static bool old_suspend_ordering;
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void __init acpi_old_suspend_ordering(void)
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{
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old_suspend_ordering = true;
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}
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/**
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* acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
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*/
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static int acpi_pm_freeze(void)
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{
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acpi_disable_all_gpes();
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acpi_os_wait_events_complete(NULL);
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acpi_ec_block_transactions();
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return 0;
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}
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/**
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* acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
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*/
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static int acpi_pm_pre_suspend(void)
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{
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acpi_pm_freeze();
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return suspend_nvs_save();
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}
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/**
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* __acpi_pm_prepare - Prepare the platform to enter the target state.
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*
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* If necessary, set the firmware waking vector and do arch-specific
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* nastiness to get the wakeup code to the waking vector.
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*/
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static int __acpi_pm_prepare(void)
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{
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int error = acpi_sleep_prepare(acpi_target_sleep_state);
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if (error)
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acpi_target_sleep_state = ACPI_STATE_S0;
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return error;
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}
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/**
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* acpi_pm_prepare - Prepare the platform to enter the target sleep
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* state and disable the GPEs.
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*/
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static int acpi_pm_prepare(void)
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{
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int error = __acpi_pm_prepare();
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if (!error)
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error = acpi_pm_pre_suspend();
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return error;
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}
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static int find_powerf_dev(struct device *dev, void *data)
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{
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struct acpi_device *device = to_acpi_device(dev);
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const char *hid = acpi_device_hid(device);
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return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
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}
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/**
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* acpi_pm_finish - Instruct the platform to leave a sleep state.
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*
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* This is called after we wake back up (or if entering the sleep state
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* failed).
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*/
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static void acpi_pm_finish(void)
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{
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struct device *pwr_btn_dev;
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u32 acpi_state = acpi_target_sleep_state;
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acpi_ec_unblock_transactions();
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suspend_nvs_free();
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if (acpi_state == ACPI_STATE_S0)
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return;
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printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
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acpi_state);
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acpi_disable_wakeup_devices(acpi_state);
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acpi_leave_sleep_state(acpi_state);
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/* reset firmware waking vector */
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acpi_set_firmware_waking_vector((acpi_physical_address) 0);
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acpi_target_sleep_state = ACPI_STATE_S0;
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/* If we were woken with the fixed power button, provide a small
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* hint to userspace in the form of a wakeup event on the fixed power
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* button device (if it can be found).
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*
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* We delay the event generation til now, as the PM layer requires
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* timekeeping to be running before we generate events. */
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if (!pwr_btn_event_pending)
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return;
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pwr_btn_event_pending = false;
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pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
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find_powerf_dev);
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if (pwr_btn_dev) {
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pm_wakeup_event(pwr_btn_dev, 0);
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put_device(pwr_btn_dev);
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}
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}
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/**
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* acpi_pm_end - Finish up suspend sequence.
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*/
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static void acpi_pm_end(void)
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{
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/*
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* This is necessary in case acpi_pm_finish() is not called during a
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* failing transition to a sleep state.
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*/
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acpi_target_sleep_state = ACPI_STATE_S0;
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acpi_sleep_tts_switch(acpi_target_sleep_state);
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}
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#else /* !CONFIG_ACPI_SLEEP */
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#define acpi_target_sleep_state ACPI_STATE_S0
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#endif /* CONFIG_ACPI_SLEEP */
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#ifdef CONFIG_SUSPEND
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static u32 acpi_suspend_states[] = {
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[PM_SUSPEND_ON] = ACPI_STATE_S0,
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[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
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[PM_SUSPEND_MEM] = ACPI_STATE_S3,
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[PM_SUSPEND_MAX] = ACPI_STATE_S5
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};
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/**
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* acpi_suspend_begin - Set the target system sleep state to the state
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* associated with given @pm_state, if supported.
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*/
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static int acpi_suspend_begin(suspend_state_t pm_state)
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{
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u32 acpi_state = acpi_suspend_states[pm_state];
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int error = 0;
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error = nvs_nosave ? 0 : suspend_nvs_alloc();
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if (error)
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return error;
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if (sleep_states[acpi_state]) {
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acpi_target_sleep_state = acpi_state;
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acpi_sleep_tts_switch(acpi_target_sleep_state);
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} else {
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printk(KERN_ERR "ACPI does not support this state: %d\n",
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pm_state);
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error = -ENOSYS;
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}
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return error;
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}
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/**
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* acpi_suspend_enter - Actually enter a sleep state.
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* @pm_state: ignored
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*
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* Flush caches and go to sleep. For STR we have to call arch-specific
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* assembly, which in turn call acpi_enter_sleep_state().
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* It's unfortunate, but it works. Please fix if you're feeling frisky.
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*/
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static int acpi_suspend_enter(suspend_state_t pm_state)
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{
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acpi_status status = AE_OK;
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u32 acpi_state = acpi_target_sleep_state;
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int error;
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ACPI_FLUSH_CPU_CACHE();
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switch (acpi_state) {
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case ACPI_STATE_S1:
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barrier();
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status = acpi_enter_sleep_state(acpi_state, wake_sleep_flags);
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break;
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case ACPI_STATE_S3:
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error = acpi_suspend_lowlevel();
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if (error)
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return error;
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pr_info(PREFIX "Low-level resume complete\n");
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break;
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}
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/* This violates the spec but is required for bug compatibility. */
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acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
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/* Reprogram control registers and execute _BFS */
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acpi_leave_sleep_state_prep(acpi_state, wake_sleep_flags);
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/* ACPI 3.0 specs (P62) says that it's the responsibility
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* of the OSPM to clear the status bit [ implying that the
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* POWER_BUTTON event should not reach userspace ]
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*
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* However, we do generate a small hint for userspace in the form of
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* a wakeup event. We flag this condition for now and generate the
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* event later, as we're currently too early in resume to be able to
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* generate wakeup events.
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*/
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if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
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acpi_event_status pwr_btn_status;
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acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
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if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
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acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
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/* Flag for later */
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pwr_btn_event_pending = true;
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}
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}
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/*
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* Disable and clear GPE status before interrupt is enabled. Some GPEs
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* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
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* acpi_leave_sleep_state will reenable specific GPEs later
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*/
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acpi_disable_all_gpes();
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/* Allow EC transactions to happen. */
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acpi_ec_unblock_transactions_early();
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suspend_nvs_restore();
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return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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}
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static int acpi_suspend_state_valid(suspend_state_t pm_state)
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{
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u32 acpi_state;
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switch (pm_state) {
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case PM_SUSPEND_ON:
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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acpi_state = acpi_suspend_states[pm_state];
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return sleep_states[acpi_state];
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default:
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return 0;
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}
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}
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static const struct platform_suspend_ops acpi_suspend_ops = {
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.valid = acpi_suspend_state_valid,
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.begin = acpi_suspend_begin,
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.prepare_late = acpi_pm_prepare,
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.enter = acpi_suspend_enter,
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.wake = acpi_pm_finish,
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.end = acpi_pm_end,
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};
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/**
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* acpi_suspend_begin_old - Set the target system sleep state to the
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* state associated with given @pm_state, if supported, and
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* execute the _PTS control method. This function is used if the
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* pre-ACPI 2.0 suspend ordering has been requested.
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*/
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static int acpi_suspend_begin_old(suspend_state_t pm_state)
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{
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int error = acpi_suspend_begin(pm_state);
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if (!error)
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error = __acpi_pm_prepare();
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return error;
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}
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/*
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* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
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* been requested.
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*/
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static const struct platform_suspend_ops acpi_suspend_ops_old = {
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.valid = acpi_suspend_state_valid,
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.begin = acpi_suspend_begin_old,
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.prepare_late = acpi_pm_pre_suspend,
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.enter = acpi_suspend_enter,
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.wake = acpi_pm_finish,
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.end = acpi_pm_end,
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.recover = acpi_pm_finish,
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};
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static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
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{
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old_suspend_ordering = true;
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return 0;
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}
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static int __init init_nvs_nosave(const struct dmi_system_id *d)
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{
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acpi_nvs_nosave();
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return 0;
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}
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static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
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{
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.callback = init_old_suspend_ordering,
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.ident = "Abit KN9 (nForce4 variant)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
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DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "HP xw4600 Workstation",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Panasonic CF51-2L",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR,
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"Matsushita Electric Industrial Co.,Ltd."),
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DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-FW21E",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VPCEB17FX",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-SR11M",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Everex StepNote Series",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Sony Vaio VPCEB1Z1E",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Sony Vaio VGN-NW130D",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Sony Vaio VPCCW29FX",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Averatec AV1020-ED2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_old_suspend_ordering,
|
|
.ident = "Asus A8N-SLI DELUXE",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
|
|
DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_old_suspend_ordering,
|
|
.ident = "Asus A8N-SLI Premium",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
|
|
DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Sony Vaio VGN-SR26GN_P",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Sony Vaio VGN-FW520F",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Asus K54C",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
|
|
},
|
|
},
|
|
{
|
|
.callback = init_nvs_nosave,
|
|
.ident = "Asus K54HR",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
|
|
},
|
|
},
|
|
{},
|
|
};
|
|
#endif /* CONFIG_SUSPEND */
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
static unsigned long s4_hardware_signature;
|
|
static struct acpi_table_facs *facs;
|
|
static bool nosigcheck;
|
|
|
|
void __init acpi_no_s4_hw_signature(void)
|
|
{
|
|
nosigcheck = true;
|
|
}
|
|
|
|
static int acpi_hibernation_begin(void)
|
|
{
|
|
int error;
|
|
|
|
error = nvs_nosave ? 0 : suspend_nvs_alloc();
|
|
if (!error) {
|
|
acpi_target_sleep_state = ACPI_STATE_S4;
|
|
acpi_sleep_tts_switch(acpi_target_sleep_state);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int acpi_hibernation_enter(void)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
|
|
/* This shouldn't return. If it returns, we have a problem */
|
|
status = acpi_enter_sleep_state(ACPI_STATE_S4, wake_sleep_flags);
|
|
/* Reprogram control registers and execute _BFS */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
|
|
|
|
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
|
|
}
|
|
|
|
static void acpi_hibernation_leave(void)
|
|
{
|
|
/*
|
|
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
|
|
* enable it here.
|
|
*/
|
|
acpi_enable();
|
|
/* Reprogram control registers and execute _BFS */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
|
|
/* Check the hardware signature */
|
|
if (facs && s4_hardware_signature != facs->hardware_signature) {
|
|
printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
|
|
"cannot resume!\n");
|
|
panic("ACPI S4 hardware signature mismatch");
|
|
}
|
|
/* Restore the NVS memory area */
|
|
suspend_nvs_restore();
|
|
/* Allow EC transactions to happen. */
|
|
acpi_ec_unblock_transactions_early();
|
|
}
|
|
|
|
static void acpi_pm_thaw(void)
|
|
{
|
|
acpi_ec_unblock_transactions();
|
|
acpi_enable_all_runtime_gpes();
|
|
}
|
|
|
|
static const struct platform_hibernation_ops acpi_hibernation_ops = {
|
|
.begin = acpi_hibernation_begin,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_pm_prepare,
|
|
.finish = acpi_pm_finish,
|
|
.prepare = acpi_pm_prepare,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
};
|
|
|
|
/**
|
|
* acpi_hibernation_begin_old - Set the target system sleep state to
|
|
* ACPI_STATE_S4 and execute the _PTS control method. This
|
|
* function is used if the pre-ACPI 2.0 suspend ordering has been
|
|
* requested.
|
|
*/
|
|
static int acpi_hibernation_begin_old(void)
|
|
{
|
|
int error;
|
|
/*
|
|
* The _TTS object should always be evaluated before the _PTS object.
|
|
* When the old_suspended_ordering is true, the _PTS object is
|
|
* evaluated in the acpi_sleep_prepare.
|
|
*/
|
|
acpi_sleep_tts_switch(ACPI_STATE_S4);
|
|
|
|
error = acpi_sleep_prepare(ACPI_STATE_S4);
|
|
|
|
if (!error) {
|
|
if (!nvs_nosave)
|
|
error = suspend_nvs_alloc();
|
|
if (!error)
|
|
acpi_target_sleep_state = ACPI_STATE_S4;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
|
|
* been requested.
|
|
*/
|
|
static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
|
|
.begin = acpi_hibernation_begin_old,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_pm_pre_suspend,
|
|
.prepare = acpi_pm_freeze,
|
|
.finish = acpi_pm_finish,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
.recover = acpi_pm_finish,
|
|
};
|
|
#endif /* CONFIG_HIBERNATION */
|
|
|
|
int acpi_suspend(u32 acpi_state)
|
|
{
|
|
suspend_state_t states[] = {
|
|
[1] = PM_SUSPEND_STANDBY,
|
|
[3] = PM_SUSPEND_MEM,
|
|
[5] = PM_SUSPEND_MAX
|
|
};
|
|
|
|
if (acpi_state < 6 && states[acpi_state])
|
|
return pm_suspend(states[acpi_state]);
|
|
if (acpi_state == 4)
|
|
return hibernate();
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/**
|
|
* acpi_pm_device_sleep_state - return preferred power state of ACPI device
|
|
* in the system sleep state given by %acpi_target_sleep_state
|
|
* @dev: device to examine; its driver model wakeup flags control
|
|
* whether it should be able to wake up the system
|
|
* @d_min_p: used to store the upper limit of allowed states range
|
|
* @d_max_in: specify the lowest allowed states
|
|
* Return value: preferred power state of the device on success, -ENODEV
|
|
* (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
|
|
*
|
|
* Find the lowest power (highest number) ACPI device power state that
|
|
* device @dev can be in while the system is in the sleep state represented
|
|
* by %acpi_target_sleep_state. If @wake is nonzero, the device should be
|
|
* able to wake up the system from this sleep state. If @d_min_p is set,
|
|
* the highest power (lowest number) device power state of @dev allowed
|
|
* in this system sleep state is stored at the location pointed to by it.
|
|
*
|
|
* The caller must ensure that @dev is valid before using this function.
|
|
* The caller is also responsible for figuring out if the device is
|
|
* supposed to be able to wake up the system and passing this information
|
|
* via @wake.
|
|
*/
|
|
|
|
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
|
|
struct acpi_device *adev;
|
|
char acpi_method[] = "_SxD";
|
|
unsigned long long d_min, d_max;
|
|
|
|
if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
|
|
return -EINVAL;
|
|
if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
|
|
printk(KERN_DEBUG "ACPI handle has no context!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_method[2] = '0' + acpi_target_sleep_state;
|
|
/*
|
|
* If the sleep state is S0, the lowest limit from ACPI is D3,
|
|
* but if the device has _S0W, we will use the value from _S0W
|
|
* as the lowest limit from ACPI. Finally, we will constrain
|
|
* the lowest limit with the specified one.
|
|
*/
|
|
d_min = ACPI_STATE_D0;
|
|
d_max = ACPI_STATE_D3;
|
|
|
|
/*
|
|
* If present, _SxD methods return the minimum D-state (highest power
|
|
* state) we can use for the corresponding S-states. Otherwise, the
|
|
* minimum D-state is D0 (ACPI 3.x).
|
|
*
|
|
* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
|
|
* provided -- that's our fault recovery, we ignore retval.
|
|
*/
|
|
if (acpi_target_sleep_state > ACPI_STATE_S0)
|
|
acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
|
|
|
|
/*
|
|
* If _PRW says we can wake up the system from the target sleep state,
|
|
* the D-state returned by _SxD is sufficient for that (we assume a
|
|
* wakeup-aware driver if wake is set). Still, if _SxW exists
|
|
* (ACPI 3.x), it should return the maximum (lowest power) D-state that
|
|
* can wake the system. _S0W may be valid, too.
|
|
*/
|
|
if (acpi_target_sleep_state == ACPI_STATE_S0 ||
|
|
(device_may_wakeup(dev) && adev->wakeup.flags.valid &&
|
|
adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
|
|
acpi_status status;
|
|
|
|
acpi_method[3] = 'W';
|
|
status = acpi_evaluate_integer(handle, acpi_method, NULL,
|
|
&d_max);
|
|
if (ACPI_FAILURE(status)) {
|
|
if (acpi_target_sleep_state != ACPI_STATE_S0 ||
|
|
status != AE_NOT_FOUND)
|
|
d_max = d_min;
|
|
} else if (d_max < d_min) {
|
|
/* Warn the user of the broken DSDT */
|
|
printk(KERN_WARNING "ACPI: Wrong value from %s\n",
|
|
acpi_method);
|
|
/* Sanitize it */
|
|
d_min = d_max;
|
|
}
|
|
}
|
|
|
|
if (d_max_in < d_min)
|
|
return -EINVAL;
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
/* constrain d_max with specified lowest limit (max number) */
|
|
if (d_max > d_max_in) {
|
|
for (d_max = d_max_in; d_max > d_min; d_max--) {
|
|
if (adev->power.states[d_max].flags.valid)
|
|
break;
|
|
}
|
|
}
|
|
return d_max;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_pm_device_run_wake - Enable/disable wake-up for given device.
|
|
* @phys_dev: Device to enable/disable the platform to wake-up the system for.
|
|
* @enable: Whether enable or disable the wake-up functionality.
|
|
*
|
|
* Find the ACPI device object corresponding to @pci_dev and try to
|
|
* enable/disable the GPE associated with it.
|
|
*/
|
|
int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
|
|
{
|
|
struct acpi_device *dev;
|
|
acpi_handle handle;
|
|
|
|
if (!device_run_wake(phys_dev))
|
|
return -EINVAL;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(phys_dev);
|
|
if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
|
|
dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (enable) {
|
|
acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
|
|
acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
|
|
} else {
|
|
acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
|
|
acpi_disable_wakeup_device_power(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_wake - enable or disable the system wake-up
|
|
* capability of given device
|
|
* @dev: device to handle
|
|
* @enable: 'true' - enable, 'false' - disable the wake-up capability
|
|
*/
|
|
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
|
|
{
|
|
acpi_handle handle;
|
|
struct acpi_device *adev;
|
|
int error;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(dev);
|
|
if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
|
|
dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
error = enable ?
|
|
acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
|
|
acpi_disable_wakeup_device_power(adev);
|
|
if (!error)
|
|
dev_info(dev, "wake-up capability %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static void acpi_power_off_prepare(void)
|
|
{
|
|
/* Prepare to power off the system */
|
|
acpi_sleep_prepare(ACPI_STATE_S5);
|
|
acpi_disable_all_gpes();
|
|
}
|
|
|
|
static void acpi_power_off(void)
|
|
{
|
|
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
|
|
printk(KERN_DEBUG "%s called\n", __func__);
|
|
local_irq_disable();
|
|
acpi_enter_sleep_state(ACPI_STATE_S5, wake_sleep_flags);
|
|
}
|
|
|
|
/*
|
|
* ACPI 2.0 created the optional _GTS and _BFS,
|
|
* but industry adoption has been neither rapid nor broad.
|
|
*
|
|
* Linux gets into trouble when it executes poorly validated
|
|
* paths through the BIOS, so disable _GTS and _BFS by default,
|
|
* but do speak up and offer the option to enable them.
|
|
*/
|
|
static void __init acpi_gts_bfs_check(void)
|
|
{
|
|
acpi_handle dummy;
|
|
|
|
if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__GTS, &dummy)))
|
|
{
|
|
printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
|
|
printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
|
|
"please notify linux-acpi@vger.kernel.org\n");
|
|
}
|
|
if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__BFS, &dummy)))
|
|
{
|
|
printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
|
|
printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
|
|
"please notify linux-acpi@vger.kernel.org\n");
|
|
}
|
|
}
|
|
|
|
int __init acpi_sleep_init(void)
|
|
{
|
|
acpi_status status;
|
|
u8 type_a, type_b;
|
|
#ifdef CONFIG_SUSPEND
|
|
int i = 0;
|
|
|
|
dmi_check_system(acpisleep_dmi_table);
|
|
#endif
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
sleep_states[ACPI_STATE_S0] = 1;
|
|
printk(KERN_INFO PREFIX "(supports S0");
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
|
|
status = acpi_get_sleep_type_data(i, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
sleep_states[i] = 1;
|
|
printk(KERN_CONT " S%d", i);
|
|
}
|
|
}
|
|
|
|
suspend_set_ops(old_suspend_ordering ?
|
|
&acpi_suspend_ops_old : &acpi_suspend_ops);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
hibernation_set_ops(old_suspend_ordering ?
|
|
&acpi_hibernation_ops_old : &acpi_hibernation_ops);
|
|
sleep_states[ACPI_STATE_S4] = 1;
|
|
printk(KERN_CONT " S4");
|
|
if (!nosigcheck) {
|
|
acpi_get_table(ACPI_SIG_FACS, 1,
|
|
(struct acpi_table_header **)&facs);
|
|
if (facs)
|
|
s4_hardware_signature =
|
|
facs->hardware_signature;
|
|
}
|
|
}
|
|
#endif
|
|
status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
|
|
if (ACPI_SUCCESS(status)) {
|
|
sleep_states[ACPI_STATE_S5] = 1;
|
|
printk(KERN_CONT " S5");
|
|
pm_power_off_prepare = acpi_power_off_prepare;
|
|
pm_power_off = acpi_power_off;
|
|
}
|
|
printk(KERN_CONT ")\n");
|
|
/*
|
|
* Register the tts_notifier to reboot notifier list so that the _TTS
|
|
* object can also be evaluated when the system enters S5.
|
|
*/
|
|
register_reboot_notifier(&tts_notifier);
|
|
acpi_gts_bfs_check();
|
|
return 0;
|
|
}
|