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SubjectRe: [RFC PATCH 1/2] acpi: Use syscore instead of pm_power_off_prepare to prepare for poweroff
On 10/12/2014 12:45 PM, Rafael J. Wysocki wrote:
> On Saturday, October 11, 2014 02:14:16 PM Guenter Roeck wrote:
>> The syscore shutdown callback seems to be perfectly suited to prepare for system
>> poweroff. Use it instead of pm_power_off_prepare.
>
> How much testing did that receive?
>

As I mentioned in patch 0/2, compile tested so far only. Before I start playing
with my servers, I wanted to get some feedback if the idea is worth pursuing
further or if I am missing something essential. _If_ it should be worth pursuing
I'll test it with some real systems (servers + laptops) before resubmitting,
and also add log messages for that testing to ensure that acpi_shutdown
is actually called.

Guenter

>> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
>> Cc: Len Brown <len.brown@intel.com>
>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>> ---
>> drivers/acpi/sleep.c | 21 ++++++++++++++++-----
>> 1 file changed, 16 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
>> index 05a31b5..e03c74d 100644
>> --- a/drivers/acpi/sleep.c
>> +++ b/drivers/acpi/sleep.c
>> @@ -17,6 +17,7 @@
>> #include <linux/interrupt.h>
>> #include <linux/suspend.h>
>> #include <linux/reboot.h>
>> +#include <linux/syscore_ops.h>
>> #include <linux/acpi.h>
>> #include <linux/module.h>
>> #include <asm/io.h>
>> @@ -820,13 +821,23 @@ int acpi_suspend(u32 acpi_state)
>> return -EINVAL;
>> }
>>
>> -static void acpi_power_off_prepare(void)
>> +static void acpi_shutdown(void)
>> {
>> - /* Prepare to power off the system */
>> - acpi_sleep_prepare(ACPI_STATE_S5);
>> - acpi_disable_all_gpes();
>> + switch (system_state) {
>> + case SYSTEM_POWER_OFF:
>> + /* Prepare to power off the system */
>> + acpi_sleep_prepare(ACPI_STATE_S5);
>> + acpi_disable_all_gpes();
>> + break;
>> + default:
>> + break;
>> + }
>> }
>>
>> +static struct syscore_ops acpi_syscore_ops = {
>> + .shutdown = acpi_shutdown,
>> +};
>> +
>> static void acpi_power_off(void)
>> {
>> /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
>> @@ -850,7 +861,7 @@ int __init acpi_sleep_init(void)
>>
>> if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
>> sleep_states[ACPI_STATE_S5] = 1;
>> - pm_power_off_prepare = acpi_power_off_prepare;
>> + register_syscore_ops(&acpi_syscore_ops);
>> pm_power_off = acpi_power_off;
>> }
>>
>>
>



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