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ACPI / x86: Add support for LPS0 callback handler

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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: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220317141445.6498-1-mario.limonciello@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mario Limonciello 2022-03-17 09:14:42 -05:00 committed by Hans de Goede
parent 6060a75e77
commit 20e1d6402a
2 changed files with 49 additions and 1 deletions
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40
drivers/acpi/x86/s2idle.c
View File

@ -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 */

10
include/linux/acpi.h
View File

@ -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