linux-kernel - Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC

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Date:	Tue, 17 Mar 2015 12:10:02 +0800
From:	Hanjun Guo <guohanjun@...wei.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	"Sudeep Holla" <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	<suravee.suthikulpanit@....com>, <linux-acpi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linaro-acpi@...ts.linaro.org>,
	"Tomasz Nowicki" <tomasz.nowicki@...aro.org>,
	Zhangdianfang <zhangdianfang@...wei.com>
Subject: Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP

On 2015/3/17 11:23, Rafael J. Wysocki wrote:
> On Tuesday, March 17, 2015 10:36:47 AM Hanjun Guo wrote:
>> On 2015/3/17 10:28, Rafael J. Wysocki wrote:
>>> On Tuesday, March 17, 2015 09:08:45 AM Hanjun Guo wrote:
>>>> On 2015/3/17 7:15, Rafael J. Wysocki wrote:
>>>>> On Monday, March 16, 2015 08:14:52 PM Hanjun Guo wrote:
>>>>>> On 2015年03月14日 05:49, Rafael J. Wysocki wrote:
>>>>>>> On Friday, March 13, 2015 04:14:29 PM Hanjun Guo wrote:
>>>> [...]
>>>>>>>> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
>>>>>>>> index 074e52b..e8728d7 100644
>>>>>>>> --- a/arch/ia64/Kconfig
>>>>>>>> +++ b/arch/ia64/Kconfig
>>>>>>>> @@ -10,6 +10,7 @@ config IA64
>>>>>>>>   	select ARCH_MIGHT_HAVE_PC_SERIO
>>>>>>>>   	select PCI if (!IA64_HP_SIM)
>>>>>>>>   	select ACPI if (!IA64_HP_SIM)
>>>>>>>> +	select ACPI_GENERIC_SLEEP if ACPI
>>>>>>>>   	select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
>>>>>>>>   	select HAVE_UNSTABLE_SCHED_CLOCK
>>>>>>>>   	select HAVE_IDE
>>>>>>>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>>>>>>>> index b7d31ca..9804431 100644
>>>>>>>> --- a/arch/x86/Kconfig
>>>>>>>> +++ b/arch/x86/Kconfig
>>>>>>>> @@ -22,6 +22,7 @@ config X86_64
>>>>>>>>   ### Arch settings
>>>>>>>>   config X86
>>>>>>>>   	def_bool y
>>>>>>>> +	select ACPI_GENERIC_SLEEP if ACPI
>>>>>>> One more nit.  If you did
>>>>>>>
>>>>>>> +	select ACPI_GENERIC_SLEEP if ACPI_SLEEP
>>>>>>>
>>>>>>> here (and above for ia64), you'd avoid having to make ACPI_SLEEP
>>>>>>> depend on ACPI_GENERIC_SLEEP which goes somewhat backwards.
>>>>>> In sleep.c,
>>>>>>
>>>>>> #ifdef CONFIG_ACPI_SLEEP
>>>>>> acpi_target_system_state()
>>>>>> {
>>>>>> }
>>>>>> #endif
>>>>>>
>>>>>> and CONFIG_ACPI_SLEEP depends on SUSPEND || HIBERNATION,
>>>>>> which one of them will be enabled on ARM64 so ACPI_SLEEP
>>>>>> will also enabled too.
>>>>>>
>>>>>> So if we
>>>>>>
>>>>>> +select ACPI_GENERIC_SLEEP if ACPI_SLEEP
>>>>>>
>>>>>> and
>>>>>>
>>>>>> +acpi-$(CONFIG_ACPI_GENERIC_SLEEP) += sleep.o
>>>>>>
>>>>>> it will lead to errors for acpi_target_system_state() that
>>>>>> is declared but not defined, so I will keep the code as
>>>>>> it is, what do you think?
>>>>> No, we need to hash this out.  Having two different Kconfig options meaning
>>>>> almost the same thing (ACPI_SLEEP and ACPI_GENERIC_SLEEP) is beyond ugly.
>>>>>
>>>>> Do you need ACPI_SLEEP on ARM64 at all?
>>>> No, at least for now we don't need it, the spec for sleep is not ready for
>>>> ARM64 arch, so ACPI_SLEEP will not work at all on ARM64.
>>> Well, so what about selecting ACPI_SLEEP from the architectures that use it?
>> Do you mean remove CONFIG_ACPI_GENERIC_SLEEP and
>>
>> +acpi-$(CONFIG_ACPI_SLEEP) += sleep.o
>>
>> as well (also need to remove duplicate #ifdef CONFIG_ACPI_SLEEP in sleep.c if
>> we doing so)?
> Well, almost.  There is one problem with that, becuase sleep.c contains code
> outside of the ACPI_SLEEP-dependent blocks.  That code is used for powering
> off ACPI platforms.
>
> I guess you don't want that code on ARM too, right?

Yes, you are right.

>
> Perhaps we can use ACPI_REDUCED_HARDWARE_ONLY for that?  ARM64 will be the

Sorry, I can't fully understand your intention here, could you please
explain it more?

Let me guess a little bit. Do you mean use ACPI_REDUCED_HARDWARE_ONLY for
powering off ACPI platforms? if so, I guess it's not a good idea, ACPI spec
only says that S4BIOS is not supported on HW-reduced ACPI platforms, S5
has no such limitation, if I miss something here, please let me know.

> only arch setting it at least for the time being, is that correct?

That's pretty sure for now.

Thanks
Hanjun

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