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ACPI: PM: Call pm_set_suspend_via_firmware() during hibernation

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On systems with ACPI platform firmware the last stage of hibernation
is analogous to system suspend to S3 (suspend-to-RAM), so it should
be handled analogously.  In particular, pm_suspend_via_firmware()
should return 'true' in that stage to let the callers of it know that
control will be passed to the platform firmware going forward, so
pm_set_suspend_via_firmware() needs to be called then in analogy with
acpi_suspend_begin().

However, the platform hibernation ->begin() callback is invoked
during the "freeze" transition (before creating a snapshot image of
system memory) as well as during the "hibernate" transition which is
the last stage of it and pm_set_suspend_via_firmware() should be
invoked by that callback in the latter stage only.

In order to implement that redefine the hibernation ->begin()
callback to take a pm_message_t argument to indicate which stage
of hibernation is taking place and rework acpi_hibernation_begin()
and acpi_hibernation_begin_old() to take it into account as needed.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2019-05-16 12:43:19 +02:00
parent 9a51c6b1f9
commit bb1869012d
3 changed files with 27 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/acpi/sleep.c
View File

@ -1132,15 +1132,19 @@ void __init acpi_no_s4_hw_signature(void)
nosigcheck = true;
}
static int acpi_hibernation_begin(void)
static int acpi_hibernation_begin(pm_message_t stage)
{
int error;
if (!nvs_nosave) {
int error = suspend_nvs_alloc();
if (error)
return error;
}
error = nvs_nosave ? 0 : suspend_nvs_alloc();
if (!error)
acpi_pm_start(ACPI_STATE_S4);
if (stage.event == PM_EVENT_HIBERNATE)
pm_set_suspend_via_firmware();
return error;
acpi_pm_start(ACPI_STATE_S4);
return 0;
}
static int acpi_hibernation_enter(void)
@ -1200,7 +1204,7 @@ static const struct platform_hibernation_ops acpi_hibernation_ops = {
* function is used if the pre-ACPI 2.0 suspend ordering has been
* requested.
*/
static int acpi_hibernation_begin_old(void)
static int acpi_hibernation_begin_old(pm_message_t stage)
{
int error;
/*
@ -1211,16 +1215,21 @@ static int acpi_hibernation_begin_old(void)
acpi_sleep_tts_switch(ACPI_STATE_S4);
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (error)
return error;
if (!error) {
if (!nvs_nosave)
error = suspend_nvs_alloc();
if (!error) {
acpi_target_sleep_state = ACPI_STATE_S4;
acpi_scan_lock_acquire();
}
if (!nvs_nosave) {
error = suspend_nvs_alloc();
if (error)
return error;
}
return error;
if (stage.event == PM_EVENT_HIBERNATE)
pm_set_suspend_via_firmware();
acpi_target_sleep_state = ACPI_STATE_S4;
acpi_scan_lock_acquire();
return 0;
}
/*

2
include/linux/suspend.h
View File

@ -359,7 +359,7 @@ extern void mark_free_pages(struct zone *zone);
* platforms which require special recovery actions in that situation.
*/
struct platform_hibernation_ops {
int (*begin)(void);
int (*begin)(pm_message_t stage);
void (*end)(void);
int (*pre_snapshot)(void);
void (*finish)(void);

4
kernel/power/hibernate.c
View File

@ -129,7 +129,7 @@ static int hibernation_test(int level) { return 0; }
static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
hibernation_ops->begin() : 0;
hibernation_ops->begin(PMSG_FREEZE) : 0;
}
/**
@ -542,7 +542,7 @@ int hibernation_platform_enter(void)
* hibernation_ops->finish() before saving the image, so we should let
* the firmware know that we're going to enter the sleep state after all
*/
error = hibernation_ops->begin();
error = hibernation_ops->begin(PMSG_HIBERNATE);
if (error)
goto Close;