Commit fef98671 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

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



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: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 146f1ed8

drivers/acpi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/acpi/sleep.c

+12 −441
Original line number Diff line number Diff line
@@ -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 */

drivers/acpi/sleep.h

+16 −0
Original line number Diff line number Diff line
@@ -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

drivers/acpi/x86/s2idle.c

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+460 −0

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