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ACPI hibernate: Introduce new kernel parameter acpi_sleep=s4_nonvs

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On some machines it may be necessary to disable the saving/restoring
of the ACPI NVS memory region during hibernation/resume.  For this
purpose, introduce new ACPI kernel command line option
acpi_sleep=s4_nonvs.

Based on a patch by Zhang Rui.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@tuxonice.net>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2008-10-26 20:56:30 +01:00 committed by Len Brown
parent b69edc7653
commit ba84ed9546
4 changed files with 23 additions and 3 deletions
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5
Documentation/kernel-parameters.txt
View file

@ -149,7 +149,8 @@ and is between 256 and 4096 characters. It is defined in the file
default: 0
acpi_sleep= [HW,ACPI] Sleep options
Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering }
Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
old_ordering, s4_nonvs }
See Documentation/power/video.txt for s3_bios and s3_mode.
s3_beep is for debugging; it makes the PC's speaker beep
as soon as the kernel's real-mode entry point is called.
@ -159,6 +160,8 @@ and is between 256 and 4096 characters. It is defined in the file
control method, wrt putting devices into low power
states, to be enforced (the ACPI 2.0 ordering of _PTS is
used by default).
s4_nonvs prevents the kernel from saving/restoring the
ACPI NVS memory during hibernation.
acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
Format: { level | edge | high | low }

2
arch/x86/kernel/acpi/sleep.c
View file

@ -159,6 +159,8 @@ static int __init acpi_sleep_setup(char *str)
#endif
if (strncmp(str, "old_ordering", 12) == 0)
acpi_old_suspend_ordering();
if (strncmp(str, "s4_nonvs", 8) == 0)
acpi_s4_no_nvs();
str = strchr(str, ',');
if (str != NULL)
str += strspn(str, ", \t");

18
drivers/acpi/sleep/main.c
View file

@ -101,6 +101,19 @@ void __init acpi_old_suspend_ordering(void)
* cases.
*/
static bool set_sci_en_on_resume;
/*
* The ACPI specification wants us to save NVS memory regions during hibernation
* and to restore them during the subsequent resume. However, it is not certain
* if this mechanism is going to work on all machines, so we allow the user to
* disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
* option.
*/
static bool s4_no_nvs;
void __init acpi_s4_no_nvs(void)
{
s4_no_nvs = true;
}
/**
* acpi_pm_disable_gpes - Disable the GPEs.
@ -396,7 +409,7 @@ static int acpi_hibernation_begin(void)
{
int error;
error = hibernate_nvs_alloc();
error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
if (!error) {
acpi_target_sleep_state = ACPI_STATE_S4;
acpi_sleep_tts_switch(acpi_target_sleep_state);
@ -494,7 +507,8 @@ static int acpi_hibernation_begin_old(void)
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (!error) {
error = hibernate_nvs_alloc();
if (!s4_no_nvs)
error = hibernate_nvs_alloc();
if (!error)
acpi_target_sleep_state = ACPI_STATE_S4;
}

1
include/linux/acpi.h
View file

@ -270,6 +270,7 @@ int acpi_check_mem_region(resource_size_t start, resource_size_t n,
#ifdef CONFIG_PM_SLEEP
void __init acpi_no_s4_hw_signature(void);
void __init acpi_old_suspend_ordering(void);
void __init acpi_s4_no_nvs(void);
#endif /* CONFIG_PM_SLEEP */
#else /* CONFIG_ACPI */