Commit 20e1d640 authored by Mario Limonciello's avatar Mario Limonciello Committed by Hans de Goede
Browse files

ACPI / x86: Add support for LPS0 callback handler 



Currenty the latest thing run during a suspend to idle attempt is
the LPS0 `prepare_late` callback and the earliest thing is the
`resume_early` callback.

There is a desire for the `amd-pmc` driver to suspend later in the
suspend process (ideally the very last thing), so create a callback
that it or any other driver can hook into to do this.

Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220317141445.6498-1-mario.limonciello@amd.com


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 6060a75e

drivers/acpi/x86/s2idle.c

+40 −0
Original line number Diff line number Diff line
@@ -86,6 +86,8 @@ struct lpi_device_constraint_amd { 
	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;
@@ -444,6 +446,8 @@ static struct acpi_scan_handler lps0_handler = { 


int acpi_s2idle_prepare_late(void)

{

	struct acpi_s2idle_dev_ops *handler;



	if (!lps0_device_handle || sleep_no_lps0)

		return 0;
@@ -474,14 +478,26 @@ int acpi_s2idle_prepare_late(void) 
		acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY,

				lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft);

	}



	list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) {

		if (handler->prepare)

			handler->prepare();

	}



	return 0;

}



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();



	/* Modern standby exit */

	if (lps0_dsm_func_mask_microsoft > 0)

		acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT,
@@ -524,4 +540,28 @@ void acpi_s2idle_setup(void) 
	s2idle_set_ops(&acpi_s2idle_ops_lps0);

}



int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)

{

	if (!lps0_device_handle || sleep_no_lps0)

		return -ENODEV;



	lock_system_sleep();

	list_add(&arg->list_node, &lps0_s2idle_devops_head);

	unlock_system_sleep();



	return 0;

}

EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);



void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)

{

	if (!lps0_device_handle || sleep_no_lps0)

		return;



	lock_system_sleep();

	list_del(&arg->list_node);

	unlock_system_sleep();

}

EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);



#endif /* CONFIG_SUSPEND */

include/linux/acpi.h

+9 −1
Original line number Diff line number Diff line
@@ -1023,7 +1023,15 @@ void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, 


acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state,

					   u32 val_a, u32 val_b);



#ifdef CONFIG_X86

struct acpi_s2idle_dev_ops {

	struct list_head list_node;

	void (*prepare)(void);

	void (*restore)(void);

};

int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg);

void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg);

#endif /* CONFIG_X86 */

#ifndef CONFIG_IA64

void arch_reserve_mem_area(acpi_physical_address addr, size_t size);

#else