blob: 9ea2481d7b116ae7d6e462360406e1b18e0aa9ea [file] [log] [blame]
/*
* sleep.c - ACPI sleep support.
*
* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
* Copyright (c) 2000-2003 Patrick Mochel
* Copyright (c) 2003 Open Source Development Lab
*
* This file is released under the GPLv2.
*
*/
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/suspend.h>
#include <linux/reboot.h>
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/syscore_ops.h>
#include <asm/io.h>
#include <trace/events/power.h>
#include "internal.h"
#include "sleep.h"
/*
* Some HW-full platforms do not have _S5, so they may need
* to leverage efi power off for a shutdown.
*/
bool acpi_no_s5;
static u8 sleep_states[ACPI_S_STATE_COUNT];
static void acpi_sleep_tts_switch(u32 acpi_state)
{
acpi_status status;
status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
/*
* OS can't evaluate the _TTS object correctly. Some warning
* message will be printed. But it won't break anything.
*/
printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
}
}
static int tts_notify_reboot(struct notifier_block *this,
unsigned long code, void *x)
{
acpi_sleep_tts_switch(ACPI_STATE_S5);
return NOTIFY_DONE;
}
static struct notifier_block tts_notifier = {
.notifier_call = tts_notify_reboot,
.next = NULL,
.priority = 0,
};
static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
/* do we have a wakeup address for S2 and S3? */
if (acpi_state == ACPI_STATE_S3) {
if (!acpi_wakeup_address)
return -EFAULT;
acpi_set_waking_vector(acpi_wakeup_address);
}
ACPI_FLUSH_CPU_CACHE();
#endif
printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
acpi_state);
acpi_enable_wakeup_devices(acpi_state);
acpi_enter_sleep_state_prep(acpi_state);
return 0;
}
static bool acpi_sleep_state_supported(u8 sleep_state)
{
acpi_status status;
u8 type_a, type_b;
status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
|| (acpi_gbl_FADT.sleep_control.address
&& acpi_gbl_FADT.sleep_status.address));
}
#ifdef CONFIG_ACPI_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
u32 acpi_target_system_state(void)
{
return acpi_target_sleep_state;
}
EXPORT_SYMBOL_GPL(acpi_target_system_state);
static bool pwr_btn_event_pending;
/*
* The ACPI specification wants us to save NVS memory regions during hibernation
* and to restore them during the subsequent resume. Windows does that also for
* suspend to RAM. However, it is known that this mechanism does not work on
* all machines, so we allow the user to disable it with the help of the
* 'acpi_sleep=nonvs' kernel command line option.
*/
static bool nvs_nosave;
void __init acpi_nvs_nosave(void)
{
nvs_nosave = true;
}
/*
* The ACPI specification wants us to save NVS memory regions during hibernation
* but says nothing about saving NVS during S3. Not all versions of Windows
* save NVS on S3 suspend either, and it is clear that not all systems need
* NVS to be saved at S3 time. To improve suspend/resume time, allow the
* user to disable saving NVS on S3 if their system does not require it, but
* continue to save/restore NVS for S4 as specified.
*/
static bool nvs_nosave_s3;
void __init acpi_nvs_nosave_s3(void)
{
nvs_nosave_s3 = true;
}
static int __init init_nvs_save_s3(const struct dmi_system_id *d)
{
nvs_nosave_s3 = false;
return 0;
}
/*
* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
* user to request that behavior by using the 'acpi_old_suspend_ordering'
* kernel command line option that causes the following variable to be set.
*/
static bool old_suspend_ordering;
void __init acpi_old_suspend_ordering(void)
{
old_suspend_ordering = true;
}
static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
{
acpi_old_suspend_ordering();
return 0;
}
static int __init init_nvs_nosave(const struct dmi_system_id *d)
{
acpi_nvs_nosave();
return 0;
}
static bool acpi_sleep_no_lps0;
static int __init init_no_lps0(const struct dmi_system_id *d)
{
acpi_sleep_no_lps0 = true;
return 0;
}
static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
{
.callback = init_old_suspend_ordering,
.ident = "Abit KN9 (nForce4 variant)",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
},
},
{
.callback = init_old_suspend_ordering,
.ident = "HP xw4600 Workstation",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
},
},
{
.callback = init_old_suspend_ordering,
.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
},
},
{
.callback = init_old_suspend_ordering,
.ident = "Panasonic CF51-2L",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR,
"Matsushita Electric Industrial Co.,Ltd."),
DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Sony Vaio VGN-FW41E_H",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Sony Vaio VGN-FW21E",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Sony Vaio VGN-FW21M",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Sony Vaio VPCEB17FX",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Sony Vaio VGN-SR11M",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
},
},
{
.callback = init_nvs_nosave,
.ident = "Everex StepNote Series",
.matches = {
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 VPCEB1S1E",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
},
},
{
.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"),
},
},
/*
* https://bugzilla.kernel.org/show_bug.cgi?id=189431
* Lenovo G50-45 is a platform later than 2012, but needs nvs memory
* saving during S3.
*/
{
.callback = init_nvs_save_s3,
.ident = "Lenovo G50-45",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
},
},
/*
* https://bugzilla.kernel.org/show_bug.cgi?id=196907
* Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
* S0 Idle firmware interface.
*/
{
.callback = init_no_lps0,
.ident = "Dell XPS13 9360",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
},
},
{},
};
static void __init acpi_sleep_dmi_check(void)
{
int year;
if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
acpi_nvs_nosave_s3();
dmi_check_system(acpisleep_dmi_table);
}
/**
* acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
*/
static int acpi_pm_freeze(void)
{
acpi_disable_all_gpes();
acpi_os_wait_events_complete();
acpi_ec_block_transactions();
return 0;
}
/**
* acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
*/
static int acpi_pm_pre_suspend(void)
{
acpi_pm_freeze();
return suspend_nvs_save();
}
/**
* __acpi_pm_prepare - Prepare the platform to enter the target state.
*
* If necessary, set the firmware waking vector and do arch-specific
* nastiness to get the wakeup code to the waking vector.
*/
static int __acpi_pm_prepare(void)
{
int error = acpi_sleep_prepare(acpi_target_sleep_state);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
}
/**
* acpi_pm_prepare - Prepare the platform to enter the target sleep
* state and disable the GPEs.
*/
static int acpi_pm_prepare(void)
{
int error = __acpi_pm_prepare();
if (!error)
error = acpi_pm_pre_suspend();
return error;
}
static int find_powerf_dev(struct device *dev, void *data)
{
struct acpi_device *device = to_acpi_device(dev);
const char *hid = acpi_device_hid(device);
return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
}
/**
* acpi_pm_finish - Instruct the platform to leave a sleep state.
*
* This is called after we wake back up (or if entering the sleep state
* failed).
*/
static void acpi_pm_finish(void)
{
struct device *pwr_btn_dev;
u32 acpi_state = acpi_target_sleep_state;
acpi_ec_unblock_transactions();
suspend_nvs_free();
if (acpi_state == ACPI_STATE_S0)
return;
printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
acpi_state);
acpi_disable_wakeup_devices(acpi_state);
acpi_leave_sleep_state(acpi_state);
/* reset firmware waking vector */
acpi_set_waking_vector(0);
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_resume_power_resources();
/* If we were woken with the fixed power button, provide a small
* hint to userspace in the form of a wakeup event on the fixed power
* button device (if it can be found).
*
* We delay the event generation til now, as the PM layer requires
* timekeeping to be running before we generate events. */
if (!pwr_btn_event_pending)
return;
pwr_btn_event_pending = false;
pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
find_powerf_dev);
if (pwr_btn_dev) {
pm_wakeup_event(pwr_btn_dev, 0);
put_device(pwr_btn_dev);
}
}
/**
* acpi_pm_start - Start system PM transition.
*/
static void acpi_pm_start(u32 acpi_state)
{
acpi_target_sleep_state = acpi_state;
acpi_sleep_tts_switch(acpi_target_sleep_state);
acpi_scan_lock_acquire();
}
/**
* acpi_pm_end - Finish up system PM transition.
*/
static void acpi_pm_end(void)
{
acpi_turn_off_unused_power_resources();
acpi_scan_lock_release();
/*
* This is necessary in case acpi_pm_finish() is not called during a
* failing transition to a sleep state.
*/
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_sleep_tts_switch(acpi_target_sleep_state);
}
#else /* !CONFIG_ACPI_SLEEP */
#define acpi_target_sleep_state ACPI_STATE_S0
#define acpi_sleep_no_lps0 (false)
static inline void acpi_sleep_dmi_check(void) {}
#endif /* CONFIG_ACPI_SLEEP */
#ifdef CONFIG_SUSPEND
static u32 acpi_suspend_states[] = {
[PM_SUSPEND_ON] = ACPI_STATE_S0,
[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
[PM_SUSPEND_MEM] = ACPI_STATE_S3,
[PM_SUSPEND_MAX] = ACPI_STATE_S5
};
/**
* acpi_suspend_begin - Set the target system sleep state to the state
* associated with given @pm_state, if supported.
*/
static int acpi_suspend_begin(suspend_state_t pm_state)
{
u32 acpi_state = acpi_suspend_states[pm_state];
int error;
error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
if (error)
return error;
if (!sleep_states[acpi_state]) {
pr_err("ACPI does not support sleep state S%u\n", acpi_state);
return -ENOSYS;
}
if (acpi_state > ACPI_STATE_S1)
pm_set_suspend_via_firmware();
acpi_pm_start(acpi_state);
return 0;
}
/**
* acpi_suspend_enter - Actually enter a sleep state.
* @pm_state: ignored
*
* Flush caches and go to sleep. For STR we have to call arch-specific
* assembly, which in turn call acpi_enter_sleep_state().
* It's unfortunate, but it works. Please fix if you're feeling frisky.
*/
static int acpi_suspend_enter(suspend_state_t pm_state)
{
acpi_status status = AE_OK;
u32 acpi_state = acpi_target_sleep_state;
int error;
u64 tsc;
ACPI_FLUSH_CPU_CACHE();
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
switch (acpi_state) {
case ACPI_STATE_S1:
barrier();
status = acpi_enter_sleep_state(acpi_state);
break;
case ACPI_STATE_S3:
if (!acpi_suspend_lowlevel)
return -ENOSYS;
error = acpi_suspend_lowlevel();
if (error)
return error;
rdtscll(tsc);
printk(KERN_INFO "TSC at resume: %llu\n",
(unsigned long long)tsc);
pr_info(PREFIX "Low-level resume complete\n");
pm_set_resume_via_firmware();
break;
}
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
/* This violates the spec but is required for bug compatibility. */
acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
/* Reprogram control registers */
acpi_leave_sleep_state_prep(acpi_state);
/* ACPI 3.0 specs (P62) says that it's the responsibility
* of the OSPM to clear the status bit [ implying that the
* POWER_BUTTON event should not reach userspace ]
*
* However, we do generate a small hint for userspace in the form of
* a wakeup event. We flag this condition for now and generate the
* event later, as we're currently too early in resume to be able to
* generate wakeup events.
*/
if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
/* Flag for later */
pwr_btn_event_pending = true;
}
}
/*
* Disable and clear GPE status before interrupt is enabled. Some GPEs
* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
* acpi_leave_sleep_state will reenable specific GPEs later
*/
acpi_disable_all_gpes();
/* Allow EC transactions to happen. */
acpi_ec_unblock_transactions();
suspend_nvs_restore();
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
static int acpi_suspend_state_valid(suspend_state_t pm_state)
{
u32 acpi_state;
switch (pm_state) {
case PM_SUSPEND_ON:
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
acpi_state = acpi_suspend_states[pm_state];
return sleep_states[acpi_state];
default:
return 0;
}
}
static const struct platform_suspend_ops acpi_suspend_ops = {
.valid = acpi_suspend_state_valid,
.begin = acpi_suspend_begin,
.prepare_late = acpi_pm_prepare,
.enter = acpi_suspend_enter,
.wake = acpi_pm_finish,
.end = acpi_pm_end,
};
/**
* acpi_suspend_begin_old - Set the target system sleep state to the
* state associated with given @pm_state, if supported, and
* execute the _PTS control method. This function is used if the
* pre-ACPI 2.0 suspend ordering has been requested.
*/
static int acpi_suspend_begin_old(suspend_state_t pm_state)
{
int error = acpi_suspend_begin(pm_state);
if (!error)
error = __acpi_pm_prepare();
return error;
}
/*
* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
* been requested.
*/
static const struct platform_suspend_ops acpi_suspend_ops_old = {
.valid = acpi_suspend_state_valid,
.begin = acpi_suspend_begin_old,
.prepare_late = acpi_pm_pre_suspend,
.enter = acpi_suspend_enter,
.wake = acpi_pm_finish,
.end = acpi_pm_end,
.recover = acpi_pm_finish,
};
static bool s2idle_in_progress;
static bool s2idle_wakeup;
/*
* On platforms supporting the Low Power S0 Idle interface there is an ACPI
* device object with the PNP0D80 compatible device ID (System Power Management
* Controller) and a specific _DSM method under it. That method, if present,
* can be used to indicate to the platform that the OS is transitioning into a
* low-power state in which certain types of activity are not desirable or that
* it is leaving such a state, which allows the platform to adjust its operation
* mode accordingly.
*/
static const struct acpi_device_id lps0_device_ids[] = {
{"PNP0D80", },
{"", },
};
#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
#define ACPI_LPS0_SCREEN_OFF 3
#define ACPI_LPS0_SCREEN_ON 4
#define ACPI_LPS0_ENTRY 5
#define ACPI_LPS0_EXIT 6
#define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT))
static acpi_handle lps0_device_handle;
static guid_t lps0_dsm_guid;
static char lps0_dsm_func_mask;
/* Device constraint entry structure */
struct lpi_device_info {
char *name;
int enabled;
union acpi_object *package;
};
/* Constraint package structure */
struct lpi_device_constraint {
int uid;
int min_dstate;
int function_states;
};
struct lpi_constraints {
acpi_handle handle;
int min_dstate;
};
static struct lpi_constraints *lpi_constraints_table;
static int lpi_constraints_table_size;
static void lpi_device_get_constraints(void)
{
union acpi_object *out_obj;
int i;
out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
NULL, ACPI_TYPE_PACKAGE);
acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
out_obj ? "successful" : "failed");
if (!out_obj)
return;
lpi_constraints_table = kcalloc(out_obj->package.count,
sizeof(*lpi_constraints_table),
GFP_KERNEL);
if (!lpi_constraints_table)
goto free_acpi_buffer;
acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
for (i = 0; i < out_obj->package.count; i++) {
struct lpi_constraints *constraint;
acpi_status status;
union acpi_object *package = &out_obj->package.elements[i];
struct lpi_device_info info = { };
int package_count = 0, j;
if (!package)
continue;
for (j = 0; j < package->package.count; ++j) {
union acpi_object *element =
&(package->package.elements[j]);
switch (element->type) {
case ACPI_TYPE_INTEGER:
info.enabled = element->integer.value;
break;
case ACPI_TYPE_STRING:
info.name = element->string.pointer;
break;
case ACPI_TYPE_PACKAGE:
package_count = element->package.count;
info.package = element->package.elements;
break;
}
}
if (!info.enabled || !info.package || !info.name)
continue;
constraint = &lpi_constraints_table[lpi_constraints_table_size];
status = acpi_get_handle(NULL, info.name, &constraint->handle);
if (ACPI_FAILURE(status))
continue;
acpi_handle_debug(lps0_device_handle,
"index:%d Name:%s\n", i, info.name);
constraint->min_dstate = -1;
for (j = 0; j < package_count; ++j) {
union acpi_object *info_obj = &info.package[j];
union acpi_object *cnstr_pkg;
union acpi_object *obj;
struct lpi_device_constraint dev_info;
switch (info_obj->type) {
case ACPI_TYPE_INTEGER:
/* version */
break;
case ACPI_TYPE_PACKAGE:
if (info_obj->package.count < 2)
break;
cnstr_pkg = info_obj->package.elements;
obj = &cnstr_pkg[0];
dev_info.uid = obj->integer.value;
obj = &cnstr_pkg[1];
dev_info.min_dstate = obj->integer.value;
acpi_handle_debug(lps0_device_handle,
"uid:%d min_dstate:%s\n",
dev_info.uid,
acpi_power_state_string(dev_info.min_dstate));
constraint->min_dstate = dev_info.min_dstate;
break;
}
}
if (constraint->min_dstate < 0) {
acpi_handle_debug(lps0_device_handle,
"Incomplete constraint defined\n");
continue;
}
lpi_constraints_table_size++;
}
acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
free_acpi_buffer:
ACPI_FREE(out_obj);
}
static void lpi_check_constraints(void)
{
int i;
for (i = 0; i < lpi_constraints_table_size; ++i) {
struct acpi_device *adev;
if (acpi_bus_get_device(lpi_constraints_table[i].handle, &adev))
continue;
acpi_handle_debug(adev->handle,
"LPI: required min power state:%s current power state:%s\n",
acpi_power_state_string(lpi_constraints_table[i].min_dstate),
acpi_power_state_string(adev->power.state));
if (!adev->flags.power_manageable) {
acpi_handle_info(adev->handle, "LPI: Device not power manageble\n");
continue;
}
if (adev->power.state < lpi_constraints_table[i].min_dstate)
acpi_handle_info(adev->handle,
"LPI: Constraint not met; min power state:%s current power state:%s\n",
acpi_power_state_string(lpi_constraints_table[i].min_dstate),
acpi_power_state_string(adev->power.state));
}
}
static void acpi_sleep_run_lps0_dsm(unsigned int func)
{
union acpi_object *out_obj;
if (!(lps0_dsm_func_mask & (1 << func)))
return;
out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
ACPI_FREE(out_obj);
acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
func, out_obj ? "successful" : "failed");
}
static int lps0_device_attach(struct acpi_device *adev,
const struct acpi_device_id *not_used)
{
union acpi_object *out_obj;
if (lps0_device_handle)
return 0;
if (acpi_sleep_no_lps0) {
acpi_handle_info(adev->handle,
"Low Power S0 Idle interface disabled\n");
return 0;
}
if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
return 0;
guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
/* Check if the _DSM is present and as expected. */
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
char bitmask = *(char *)out_obj->buffer.pointer;
if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {
lps0_dsm_func_mask = bitmask;
lps0_device_handle = adev->handle;
/*
* Use suspend-to-idle by default if the default
* suspend mode was not set from the command line.
*/
if (mem_sleep_default > PM_SUSPEND_MEM)
mem_sleep_current = PM_SUSPEND_TO_IDLE;
}
acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
bitmask);
} else {
acpi_handle_debug(adev->handle,
"_DSM function 0 evaluation failed\n");
}
ACPI_FREE(out_obj);
lpi_device_get_constraints();
return 0;
}
static struct acpi_scan_handler lps0_handler = {
.ids = lps0_device_ids,
.attach = lps0_device_attach,
};
static int acpi_s2idle_begin(void)
{
acpi_scan_lock_acquire();
s2idle_in_progress = true;
return 0;
}
static int acpi_s2idle_prepare(void)
{
if (lps0_device_handle) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
} else {
/*
* The configuration of GPEs is changed here to avoid spurious
* wakeups, but that should not be necessary if this is a
* "low-power S0" platform and the low-power S0 _DSM is present.
*/
acpi_enable_all_wakeup_gpes();
acpi_os_wait_events_complete();
}
if (acpi_sci_irq_valid())
enable_irq_wake(acpi_sci_irq);
return 0;
}
static void acpi_s2idle_wake(void)
{
if (pm_debug_messages_on)
lpi_check_constraints();
/*
* If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
* that the SCI has triggered while suspended, so cancel the wakeup in
* case it has not been a wakeup event (the GPEs will be checked later).
*/
if (acpi_sci_irq_valid() &&
!irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
pm_system_cancel_wakeup();
s2idle_wakeup = true;
}
}
static void acpi_s2idle_sync(void)
{
/*
* Process all pending events in case there are any wakeup ones.
*
* The EC driver uses the system workqueue and an additional special
* one, so those need to be flushed too.
*/
acpi_ec_flush_work();
acpi_os_wait_events_complete();
s2idle_wakeup = false;
}
static void acpi_s2idle_restore(void)
{
if (acpi_sci_irq_valid())
disable_irq_wake(acpi_sci_irq);
if (lps0_device_handle) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
} else {
acpi_enable_all_runtime_gpes();
}
}
static void acpi_s2idle_end(void)
{
s2idle_in_progress = false;
acpi_scan_lock_release();
}
static const struct platform_s2idle_ops acpi_s2idle_ops = {
.begin = acpi_s2idle_begin,
.prepare = acpi_s2idle_prepare,
.wake = acpi_s2idle_wake,
.sync = acpi_s2idle_sync,
.restore = acpi_s2idle_restore,
.end = acpi_s2idle_end,
};
static void acpi_sleep_suspend_setup(void)
{
int i;
for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
if (acpi_sleep_state_supported(i))
sleep_states[i] = 1;
suspend_set_ops(old_suspend_ordering ?
&acpi_suspend_ops_old : &acpi_suspend_ops);
acpi_scan_add_handler(&lps0_handler);
s2idle_set_ops(&acpi_s2idle_ops);
}
#else /* !CONFIG_SUSPEND */
#define s2idle_in_progress (false)
#define s2idle_wakeup (false)
#define lps0_device_handle (NULL)
static inline void acpi_sleep_suspend_setup(void) {}
#endif /* !CONFIG_SUSPEND */
bool acpi_s2idle_wakeup(void)
{
return s2idle_wakeup;
}
bool acpi_sleep_no_ec_events(void)
{
return !s2idle_in_progress || !lps0_device_handle;
}
#ifdef CONFIG_PM_SLEEP
static u32 saved_bm_rld;
static int acpi_save_bm_rld(void)
{
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
return 0;
}
static void acpi_restore_bm_rld(void)
{
u32 resumed_bm_rld = 0;
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
if (resumed_bm_rld == saved_bm_rld)
return;
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
}
static struct syscore_ops acpi_sleep_syscore_ops = {
.suspend = acpi_save_bm_rld,
.resume = acpi_restore_bm_rld,
};
static void acpi_sleep_syscore_init(void)
{
register_syscore_ops(&acpi_sleep_syscore_ops);
}
#else
static inline void acpi_sleep_syscore_init(void) {}
#endif /* CONFIG_PM_SLEEP */
#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_pm_start(ACPI_STATE_S4);
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);
/* Reprogram control registers */
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
static void acpi_hibernation_leave(void)
{
pm_set_resume_via_firmware();
/*
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
* enable it here.
*/
acpi_enable();
/* Reprogram control registers */
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
/* Check the hardware signature */
if (facs && s4_hardware_signature != facs->hardware_signature)
pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
/* Restore the NVS memory area */
suspend_nvs_restore();
/* Allow EC transactions to happen. */
acpi_ec_unblock_transactions();
}
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;
acpi_scan_lock_acquire();
}
}
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,
};
static void acpi_sleep_hibernate_setup(void)
{
if (!acpi_sleep_state_supported(ACPI_STATE_S4))
return;
hibernation_set_ops(old_suspend_ordering ?
&acpi_hibernation_ops_old : &acpi_hibernation_ops);
sleep_states[ACPI_STATE_S4] = 1;
if (nosigcheck)
return;
acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
if (facs)
s4_hardware_signature = facs->hardware_signature;
}
#else /* !CONFIG_HIBERNATION */
static inline void acpi_sleep_hibernate_setup(void) {}
#endif /* !CONFIG_HIBERNATION */
static void acpi_power_off_prepare(void)
{
/* Prepare to power off the system */
acpi_sleep_prepare(ACPI_STATE_S5);
acpi_disable_all_gpes();
acpi_os_wait_events_complete();
}
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);
}
int __init acpi_sleep_init(void)
{
char supported[ACPI_S_STATE_COUNT * 3 + 1];
char *pos = supported;
int i;
acpi_sleep_dmi_check();
sleep_states[ACPI_STATE_S0] = 1;
acpi_sleep_syscore_init();
acpi_sleep_suspend_setup();
acpi_sleep_hibernate_setup();
if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
sleep_states[ACPI_STATE_S5] = 1;
pm_power_off_prepare = acpi_power_off_prepare;
pm_power_off = acpi_power_off;
} else {
acpi_no_s5 = true;
}
supported[0] = 0;
for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
if (sleep_states[i])
pos += sprintf(pos, " S%d", i);
}
pr_info(PREFIX "(supports%s)\n", supported);
/*
* 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);
return 0;
}