blob: dd0b40b9bbe8bef5f8c30a082eebbc25dcdfeafd [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Architecture-specific ACPI-based support for suspend-to-idle.
*
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
* Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
* Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
*
* 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.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/suspend.h>
#include "../sleep.h"
#ifdef CONFIG_SUSPEND
static bool sleep_no_lps0 __read_mostly;
module_param(sleep_no_lps0, bool, 0644);
MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
static const struct acpi_device_id lps0_device_ids[] = {
{"PNP0D80", },
{"", },
};
/* Microsoft platform agnostic UUID */
#define ACPI_LPS0_DSM_UUID_MICROSOFT "11e00d56-ce64-47ce-837b-1f898f9aa461"
#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_LPS0_MS_ENTRY 7
#define ACPI_LPS0_MS_EXIT 8
/* AMD */
#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
#define ACPI_LPS0_ENTRY_AMD 2
#define ACPI_LPS0_EXIT_AMD 3
#define ACPI_LPS0_SCREEN_OFF_AMD 4
#define ACPI_LPS0_SCREEN_ON_AMD 5
static acpi_handle lps0_device_handle;
static guid_t lps0_dsm_guid;
static int lps0_dsm_func_mask;
static guid_t lps0_dsm_guid_microsoft;
static int lps0_dsm_func_mask_microsoft;
static int lps0_dsm_state;
/* 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;
};
/* AMD Constraint package structure */
struct lpi_device_constraint_amd {
char *name;
int enabled;
int function_states;
int min_dstate;
};
static LIST_HEAD(lps0_s2idle_devops_head);
static struct lpi_constraints *lpi_constraints_table;
static int lpi_constraints_table_size;
static int rev_id;
#define for_each_lpi_constraint(entry) \
for (int i = 0; \
entry = &lpi_constraints_table[i], i < lpi_constraints_table_size; \
i++)
static void lpi_device_get_constraints_amd(void)
{
union acpi_object *out_obj;
int i, j, k;
out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
rev_id, 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;
for (i = 0; i < out_obj->package.count; i++) {
union acpi_object *package = &out_obj->package.elements[i];
if (package->type == ACPI_TYPE_PACKAGE) {
if (lpi_constraints_table) {
acpi_handle_err(lps0_device_handle,
"Duplicate constraints list\n");
goto free_acpi_buffer;
}
lpi_constraints_table = kcalloc(package->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 (j = 0; j < package->package.count; j++) {
union acpi_object *info_obj = &package->package.elements[j];
struct lpi_device_constraint_amd dev_info = {};
struct lpi_constraints *list;
acpi_status status;
list = &lpi_constraints_table[lpi_constraints_table_size];
for (k = 0; k < info_obj->package.count; k++) {
union acpi_object *obj = &info_obj->package.elements[k];
switch (k) {
case 0:
dev_info.enabled = obj->integer.value;
break;
case 1:
dev_info.name = obj->string.pointer;
break;
case 2:
dev_info.function_states = obj->integer.value;
break;
case 3:
dev_info.min_dstate = obj->integer.value;
break;
}
}
acpi_handle_debug(lps0_device_handle,
"Name:%s, Enabled: %d, States: %d, MinDstate: %d\n",
dev_info.name,
dev_info.enabled,
dev_info.function_states,
dev_info.min_dstate);
if (!dev_info.enabled || !dev_info.name ||
!dev_info.min_dstate)
continue;
status = acpi_get_handle(NULL, dev_info.name, &list->handle);
if (ACPI_FAILURE(status))
continue;
list->min_dstate = dev_info.min_dstate;
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_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);
}
/**
* acpi_get_lps0_constraint - Get the LPS0 constraint for a device.
* @adev: Device to get the constraint for.
*
* The LPS0 constraint is the shallowest (minimum) power state in which the
* device can be so as to allow the platform as a whole to achieve additional
* energy conservation by utilizing a system-wide low-power state.
*
* Returns:
* - ACPI power state value of the constraint for @adev on success.
* - Otherwise, ACPI_STATE_UNKNOWN.
*/
int acpi_get_lps0_constraint(struct acpi_device *adev)
{
struct lpi_constraints *entry;
for_each_lpi_constraint(entry) {
if (adev->handle == entry->handle)
return entry->min_dstate;
}
return ACPI_STATE_UNKNOWN;
}
static void lpi_check_constraints(void)
{
struct lpi_constraints *entry;
for_each_lpi_constraint(entry) {
struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
if (!adev)
continue;
acpi_handle_debug(entry->handle,
"LPI: required min power state:%s current power state:%s\n",
acpi_power_state_string(entry->min_dstate),
acpi_power_state_string(adev->power.state));
if (!adev->flags.power_manageable) {
acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");
entry->handle = NULL;
continue;
}
if (adev->power.state < entry->min_dstate)
acpi_handle_info(entry->handle,
"LPI: Constraint not met; min power state:%s current power state:%s\n",
acpi_power_state_string(entry->min_dstate),
acpi_power_state_string(adev->power.state));
}
}
static bool acpi_s2idle_vendor_amd(void)
{
return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
}
static const char *acpi_sleep_dsm_state_to_str(unsigned int state)
{
if (lps0_dsm_func_mask_microsoft || !acpi_s2idle_vendor_amd()) {
switch (state) {
case ACPI_LPS0_SCREEN_OFF:
return "screen off";
case ACPI_LPS0_SCREEN_ON:
return "screen on";
case ACPI_LPS0_ENTRY:
return "lps0 entry";
case ACPI_LPS0_EXIT:
return "lps0 exit";
case ACPI_LPS0_MS_ENTRY:
return "lps0 ms entry";
case ACPI_LPS0_MS_EXIT:
return "lps0 ms exit";
}
} else {
switch (state) {
case ACPI_LPS0_SCREEN_ON_AMD:
return "screen on";
case ACPI_LPS0_SCREEN_OFF_AMD:
return "screen off";
case ACPI_LPS0_ENTRY_AMD:
return "lps0 entry";
case ACPI_LPS0_EXIT_AMD:
return "lps0 exit";
}
}
return "unknown";
}
static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid)
{
union acpi_object *out_obj;
if (!(func_mask & (1 << func)))
return;
out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid,
rev_id, func, NULL);
ACPI_FREE(out_obj);
lps0_dsm_state = func;
if (pm_debug_messages_on) {
acpi_handle_info(lps0_device_handle,
"%s transitioned to state %s\n",
out_obj ? "Successfully" : "Failed to",
acpi_sleep_dsm_state_to_str(lps0_dsm_state));
}
}
static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid)
{
union acpi_object *obj;
int ret = -EINVAL;
guid_parse(uuid, dsm_guid);
/* Check if the _DSM is present and as expected. */
obj = acpi_evaluate_dsm_typed(handle, dsm_guid, rev, 0, NULL, ACPI_TYPE_BUFFER);
if (!obj || obj->buffer.length == 0 || obj->buffer.length > sizeof(u32)) {
acpi_handle_debug(handle,
"_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev);
goto out;
}
ret = *(int *)obj->buffer.pointer;
acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret);
out:
ACPI_FREE(obj);
return ret;
}
struct amd_lps0_hid_device_data {
const bool check_off_by_one;
};
static const struct amd_lps0_hid_device_data amd_picasso = {
.check_off_by_one = true,
};
static const struct amd_lps0_hid_device_data amd_cezanne = {
.check_off_by_one = false,
};
static const struct acpi_device_id amd_hid_ids[] = {
{"AMD0004", (kernel_ulong_t)&amd_picasso, },
{"AMD0005", (kernel_ulong_t)&amd_picasso, },
{"AMDI0005", (kernel_ulong_t)&amd_picasso, },
{"AMDI0006", (kernel_ulong_t)&amd_cezanne, },
{}
};
static int lps0_device_attach(struct acpi_device *adev,
const struct acpi_device_id *not_used)
{
if (lps0_device_handle)
return 0;
lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
&lps0_dsm_guid_microsoft);
if (acpi_s2idle_vendor_amd()) {
static const struct acpi_device_id *dev_id;
const struct amd_lps0_hid_device_data *data;
for (dev_id = &amd_hid_ids[0]; dev_id->id[0]; dev_id++)
if (acpi_dev_hid_uid_match(adev, dev_id->id, NULL))
break;
if (dev_id->id[0])
data = (const struct amd_lps0_hid_device_data *) dev_id->driver_data;
else
data = &amd_cezanne;
lps0_dsm_func_mask = validate_dsm(adev->handle,
ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
if (lps0_dsm_func_mask > 0x3 && data->check_off_by_one) {
lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
} else if (lps0_dsm_func_mask_microsoft > 0 && rev_id) {
lps0_dsm_func_mask_microsoft = -EINVAL;
acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");
}
} else {
rev_id = 1;
lps0_dsm_func_mask = validate_dsm(adev->handle,
ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid);
if (lps0_dsm_func_mask > 0 && lps0_dsm_func_mask_microsoft > 0) {
unsigned int func_mask;
/*
* Log a message if the _DSM function sets for two
* different UUIDs overlap.
*/
func_mask = lps0_dsm_func_mask & lps0_dsm_func_mask_microsoft;
if (func_mask)
acpi_handle_info(adev->handle,
"Duplicate LPS0 _DSM functions (mask: 0x%x)\n",
func_mask);
}
}
if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0)
return 0; //function evaluation failed
lps0_device_handle = adev->handle;
if (acpi_s2idle_vendor_amd())
lpi_device_get_constraints_amd();
else
lpi_device_get_constraints();
/*
* Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
* the FADT and the default suspend mode was not set from the command
* line.
*/
if ((acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) &&
mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) {
mem_sleep_current = PM_SUSPEND_TO_IDLE;
pr_info("Low-power S0 idle used by default for system suspend\n");
}
/*
* Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
* EC GPE to be enabled while suspended for certain wakeup devices to
* work, so mark it as wakeup-capable.
*/
acpi_ec_mark_gpe_for_wake();
return 0;
}
static struct acpi_scan_handler lps0_handler = {
.ids = lps0_device_ids,
.attach = lps0_device_attach,
};
int acpi_s2idle_prepare_late(void)
{
struct acpi_s2idle_dev_ops *handler;
if (!lps0_device_handle || sleep_no_lps0)
return 0;
if (pm_debug_messages_on)
lpi_check_constraints();
/* Screen off */
if (lps0_dsm_func_mask > 0)
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
ACPI_LPS0_SCREEN_OFF_AMD :
ACPI_LPS0_SCREEN_OFF,
lps0_dsm_func_mask, lps0_dsm_guid);
if (lps0_dsm_func_mask_microsoft > 0)
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
/* LPS0 entry */
if (lps0_dsm_func_mask > 0 && acpi_s2idle_vendor_amd())
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD,
lps0_dsm_func_mask, lps0_dsm_guid);
if (lps0_dsm_func_mask_microsoft > 0) {
/* Modern Standby entry */
acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
}
if (lps0_dsm_func_mask > 0 && !acpi_s2idle_vendor_amd())
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY,
lps0_dsm_func_mask, lps0_dsm_guid);
list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
if (handler->prepare)
handler->prepare();
}
return 0;
}
void acpi_s2idle_check(void)
{
struct acpi_s2idle_dev_ops *handler;
if (!lps0_device_handle || sleep_no_lps0)
return;
list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {
if (handler->check)
handler->check();
}
}
void acpi_s2idle_restore_early(void)
{
struct acpi_s2idle_dev_ops *handler;
if (!lps0_device_handle || sleep_no_lps0)
return;
list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node)
if (handler->restore)
handler->restore();
/* LPS0 exit */
if (lps0_dsm_func_mask > 0)
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
ACPI_LPS0_EXIT_AMD :
ACPI_LPS0_EXIT,
lps0_dsm_func_mask, lps0_dsm_guid);
if (lps0_dsm_func_mask_microsoft > 0) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
/* Modern Standby exit */
acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
}
/* Screen on */
if (lps0_dsm_func_mask_microsoft > 0)
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON,
lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);
if (lps0_dsm_func_mask > 0)
acpi_sleep_run_lps0_dsm(acpi_s2idle_vendor_amd() ?
ACPI_LPS0_SCREEN_ON_AMD :
ACPI_LPS0_SCREEN_ON,
lps0_dsm_func_mask, lps0_dsm_guid);
}
static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
.begin = acpi_s2idle_begin,
.prepare = acpi_s2idle_prepare,
.prepare_late = acpi_s2idle_prepare_late,
.check = acpi_s2idle_check,
.wake = acpi_s2idle_wake,
.restore_early = acpi_s2idle_restore_early,
.restore = acpi_s2idle_restore,
.end = acpi_s2idle_end,
};
void __init acpi_s2idle_setup(void)
{
acpi_scan_add_handler(&lps0_handler);
s2idle_set_ops(&acpi_s2idle_ops_lps0);
}
int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
{
unsigned int sleep_flags;
if (!lps0_device_handle || sleep_no_lps0)
return -ENODEV;
sleep_flags = lock_system_sleep();
list_add(&arg->list_node, &lps0_s2idle_devops_head);
unlock_system_sleep(sleep_flags);
return 0;
}
EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
{
unsigned int sleep_flags;
if (!lps0_device_handle || sleep_no_lps0)
return;
sleep_flags = lock_system_sleep();
list_del(&arg->list_node);
unlock_system_sleep(sleep_flags);
}
EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);
#endif /* CONFIG_SUSPEND */