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ACPI: PM: s2idle: Move x86-specific code to the x86 directory

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Some code in drivers/acpi/sleep.c (which is regarded as a generic
file) related to suspend-to-idle support has grown direct dependencies
on x86, but in fact it has been specific to x86 (which is the only
user of it) anyway for a long time.

For this reason, move that code to a separate file under acpi/x86/
and make it build and run as before under the right conditions.

While at it, rename a vendor checking function in that code and
consistently use acpi_handle_debug() for printing debug-related
information in it.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2020-12-17 20:23:17 +01:00
parent 146f1ed852
commit fef9867119
4 changed files with 489 additions and 441 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/acpi/Makefile
View File

@ -54,6 +54,7 @@ acpi-y += property.o
acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
acpi-$(CONFIG_X86) += x86/apple.o
acpi-$(CONFIG_X86) += x86/utils.o
acpi-$(CONFIG_X86) += x86/s2idle.o
acpi-$(CONFIG_DEBUG_FS) += debugfs.o
acpi-y += acpi_lpat.o
acpi-$(CONFIG_ACPI_LPIT) += acpi_lpit.o

453
drivers/acpi/sleep.c
View File

@ -92,10 +92,6 @@ bool acpi_sleep_state_supported(u8 sleep_state)
}
#ifdef CONFIG_ACPI_SLEEP
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 u32 acpi_target_sleep_state = ACPI_STATE_S0;
u32 acpi_target_system_state(void)
@ -165,7 +161,7 @@ static int __init init_nvs_nosave(const struct dmi_system_id *d)
return 0;
}
static bool acpi_sleep_default_s3;
bool acpi_sleep_default_s3;
static int __init init_default_s3(const struct dmi_system_id *d)
{
@ -688,409 +684,13 @@ static const struct platform_suspend_ops acpi_suspend_ops_old = {
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
/* AMD */
#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
#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 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;
};
/* AMD */
/* Device constraint entry structure */
struct lpi_device_info_amd {
int revision;
int count;
union acpi_object *package;
};
/* Constraint package structure */
struct lpi_device_constraint_amd {
char *name;
int enabled;
int function_states;
int min_dstate;
};
static struct lpi_constraints *lpi_constraints_table;
static int lpi_constraints_table_size;
static int rev_id;
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,
1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
NULL, ACPI_TYPE_PACKAGE);
if (!out_obj)
return;
acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
out_obj ? "successful" : "failed");
for (i = 0; i < out_obj->package.count; i++) {
union acpi_object *package = &out_obj->package.elements[i];
struct lpi_device_info_amd info = { };
if (package->type == ACPI_TYPE_INTEGER) {
switch (i) {
case 0:
info.revision = package->integer.value;
break;
case 1:
info.count = package->integer.value;
break;
}
} else if (package->type == ACPI_TYPE_PACKAGE) {
lpi_constraints_table = kcalloc(package->package.count,
sizeof(*lpi_constraints_table),
GFP_KERNEL);
if (!lpi_constraints_table)
goto free_acpi_buffer;
acpi_handle_info(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;
for (k = 0; k < info_obj->package.count; ++k) {
union acpi_object *obj = &info_obj->package.elements[k];
union acpi_object *obj_new;
list = &lpi_constraints_table[lpi_constraints_table_size];
list->min_dstate = -1;
obj_new = &obj[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;
}
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;
acpi_handle_info(lps0_device_handle,
"Name:%s\n", dev_info.name);
list->min_dstate = dev_info.min_dstate;
if (list->min_dstate < 0) {
acpi_handle_info(lps0_device_handle,
"Incomplete constraint defined\n");
continue;
}
}
lpi_constraints_table_size++;
}
}
}
acpi_handle_info(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);
}
static void lpi_check_constraints(void)
{
int i;
for (i = 0; i < lpi_constraints_table_size; ++i) {
acpi_handle handle = lpi_constraints_table[i].handle;
struct acpi_device *adev;
if (!handle || acpi_bus_get_device(handle, &adev))
continue;
acpi_handle_debug(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(handle, "LPI: Device not power manageable\n");
lpi_constraints_table[i].handle = NULL;
continue;
}
if (adev->power.state < lpi_constraints_table[i].min_dstate)
acpi_handle_info(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, rev_id, func, NULL);
ACPI_FREE(out_obj);
acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
func, out_obj ? "successful" : "failed");
}
static bool acpi_match_vendor_name(void)
{
#ifdef CONFIG_X86
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
return true;
#endif
return false;
}
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_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
return 0;
if (acpi_match_vendor_name()) {
guid_parse(ACPI_LPS0_DSM_UUID_AMD, &lps0_dsm_guid);
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 0, 0, NULL);
rev_id = 0;
} else {
guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
rev_id = 1;
}
/* Check if the _DSM is present and as expected. */
if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
acpi_handle_debug(adev->handle,
"_DSM function 0 evaluation failed\n");
return 0;
}
lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
ACPI_FREE(out_obj);
acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
lps0_dsm_func_mask);
lps0_device_handle = adev->handle;
if (acpi_match_vendor_name())
lpi_device_get_constraints_amd();
else
lpi_device_get_constraints();
/*
* 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 && !acpi_sleep_default_s3)
mem_sleep_current = PM_SUSPEND_TO_IDLE;
/*
* 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,
};
static int acpi_s2idle_begin(void)
int acpi_s2idle_begin(void)
{
acpi_scan_lock_acquire();
return 0;
}
static int acpi_s2idle_prepare(void)
int acpi_s2idle_prepare(void)
{
if (acpi_sci_irq_valid()) {
enable_irq_wake(acpi_sci_irq);
@ -1107,24 +707,7 @@ static int acpi_s2idle_prepare(void)
return 0;
}
static int acpi_s2idle_prepare_late(void)
{
if (!lps0_device_handle || sleep_no_lps0)
return 0;
if (pm_debug_messages_on)
lpi_check_constraints();
if (acpi_match_vendor_name()) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD);
} else {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
}
return 0;
}
static bool acpi_s2idle_wake(void)
bool acpi_s2idle_wake(void)
{
if (!acpi_sci_irq_valid())
return pm_wakeup_pending();
@ -1190,20 +773,7 @@ static bool acpi_s2idle_wake(void)
return false;
}
static void acpi_s2idle_restore_early(void)
{
if (!lps0_device_handle || sleep_no_lps0)
return;
if (acpi_match_vendor_name()) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD);
} else {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
}
}
static void acpi_s2idle_restore(void)
void acpi_s2idle_restore(void)
{
/*
* Drain pending events before restoring the working-state configuration
@ -1225,7 +795,7 @@ static void acpi_s2idle_restore(void)
}
}
static void acpi_s2idle_end(void)
void acpi_s2idle_end(void)
{
acpi_scan_lock_release();
}
@ -1233,13 +803,16 @@ static void acpi_s2idle_end(void)
static const struct platform_s2idle_ops acpi_s2idle_ops = {
.begin = acpi_s2idle_begin,
.prepare = acpi_s2idle_prepare,
.prepare_late = acpi_s2idle_prepare_late,
.wake = acpi_s2idle_wake,
.restore_early = acpi_s2idle_restore_early,
.restore = acpi_s2idle_restore,
.end = acpi_s2idle_end,
};
void __weak acpi_s2idle_setup(void)
{
s2idle_set_ops(&acpi_s2idle_ops);
}
static void acpi_sleep_suspend_setup(void)
{
int i;
@ -1251,13 +824,11 @@ static void acpi_sleep_suspend_setup(void)
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);
acpi_s2idle_setup();
}
#else /* !CONFIG_SUSPEND */
#define s2idle_wakeup (false)
#define lps0_device_handle (NULL)
static inline void acpi_sleep_suspend_setup(void) {}
#endif /* !CONFIG_SUSPEND */

16
drivers/acpi/sleep.h
View File

@ -15,3 +15,19 @@ static inline acpi_status acpi_set_waking_vector(u32 wakeup_address)
return acpi_set_firmware_waking_vector(
(acpi_physical_address)wakeup_address, 0);
}
extern int acpi_s2idle_begin(void);
extern int acpi_s2idle_prepare(void);
extern int acpi_s2idle_prepare_late(void);
extern bool acpi_s2idle_wake(void);
extern void acpi_s2idle_restore_early(void);
extern void acpi_s2idle_restore(void);
extern void acpi_s2idle_end(void);
extern void acpi_s2idle_setup(void);
#ifdef CONFIG_ACPI_SLEEP
extern bool acpi_sleep_default_s3;
#else
#define acpi_sleep_default_s3 (1)
#endif

460
drivers/acpi/x86/s2idle.c Normal file
View File

@ -0,0 +1,460 @@
// 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/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", },
{"", },
};
#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
/* AMD */
#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721"
#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 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;
};
/* AMD */
/* Device constraint entry structure */
struct lpi_device_info_amd {
int revision;
int count;
union acpi_object *package;
};
/* Constraint package structure */
struct lpi_device_constraint_amd {
char *name;
int enabled;
int function_states;
int min_dstate;
};
static struct lpi_constraints *lpi_constraints_table;
static int lpi_constraints_table_size;
static int rev_id;
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,
1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
NULL, ACPI_TYPE_PACKAGE);
if (!out_obj)
return;
acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
out_obj ? "successful" : "failed");
for (i = 0; i < out_obj->package.count; i++) {
union acpi_object *package = &out_obj->package.elements[i];
struct lpi_device_info_amd info = { };
if (package->type == ACPI_TYPE_INTEGER) {
switch (i) {
case 0:
info.revision = package->integer.value;
break;
case 1:
info.count = package->integer.value;
break;
}
} else if (package->type == ACPI_TYPE_PACKAGE) {
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;
for (k = 0; k < info_obj->package.count; ++k) {
union acpi_object *obj = &info_obj->package.elements[k];
union acpi_object *obj_new;
list = &lpi_constraints_table[lpi_constraints_table_size];
list->min_dstate = -1;
obj_new = &obj[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;
}
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;
acpi_handle_debug(lps0_device_handle,
"Name:%s\n", dev_info.name);
list->min_dstate = dev_info.min_dstate;
if (list->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_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) {
acpi_handle handle = lpi_constraints_table[i].handle;
struct acpi_device *adev;
if (!handle || acpi_bus_get_device(handle, &adev))
continue;
acpi_handle_debug(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(handle, "LPI: Device not power manageable\n");
lpi_constraints_table[i].handle = NULL;
continue;
}
if (adev->power.state < lpi_constraints_table[i].min_dstate)
acpi_handle_info(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, rev_id, func, NULL);
ACPI_FREE(out_obj);
acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
func, out_obj ? "successful" : "failed");
}
static bool acpi_s2idle_vendor_amd(void)
{
return boot_cpu_data.x86_vendor == X86_VENDOR_AMD;
}
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_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
return 0;
if (acpi_s2idle_vendor_amd()) {
guid_parse(ACPI_LPS0_DSM_UUID_AMD, &lps0_dsm_guid);
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 0, 0, NULL);
rev_id = 0;
} else {
guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
rev_id = 1;
}
/* Check if the _DSM is present and as expected. */
if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
acpi_handle_debug(adev->handle,
"_DSM function 0 evaluation failed\n");
return 0;
}
lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
ACPI_FREE(out_obj);
acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
lps0_dsm_func_mask);
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 the default suspend mode was not
* set from the command line.
*/
if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
mem_sleep_current = PM_SUSPEND_TO_IDLE;
/*
* 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)
{
if (!lps0_device_handle || sleep_no_lps0)
return 0;
if (pm_debug_messages_on)
lpi_check_constraints();
if (acpi_s2idle_vendor_amd()) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD);
} else {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
}
return 0;
}
void acpi_s2idle_restore_early(void)
{
if (!lps0_device_handle || sleep_no_lps0)
return;
if (acpi_s2idle_vendor_amd()) {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD);
} else {
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
}
}
static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
.begin = acpi_s2idle_begin,
.prepare = acpi_s2idle_prepare,
.prepare_late = acpi_s2idle_prepare_late,
.wake = acpi_s2idle_wake,
.restore_early = acpi_s2idle_restore_early,
.restore = acpi_s2idle_restore,
.end = acpi_s2idle_end,
};
void acpi_s2idle_setup(void)
{
acpi_scan_add_handler(&lps0_handler);
s2idle_set_ops(&acpi_s2idle_ops_lps0);
}
#endif /* CONFIG_SUSPEND */