linux-kernel - Re: [PATCH v10 00/21] Introduce ACPI for ARM64 based on ACPI 5.1

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Date:	Tue, 24 Mar 2015 21:46:46 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Will Deacon <will.deacon@....com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <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" <suravee.suthikulpanit@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Parth Dixit <parth.dixit@...aro.org>
Subject: Re: [PATCH v10 00/21] Introduce ACPI for ARM64 based on ACPI 5.1

On 2015年03月24日 02:32, Stefano Stabellini wrote:
> On Sat, 21 Mar 2015, Hanjun Guo wrote:
>> +CC Parth Dixit, Stefano Stabellini.
>>
>> On 2015年03月21日 02:54, Will Deacon wrote:
>>> On Thu, Mar 19, 2015 at 04:09:33AM +0000, Hanjun Guo wrote:
>>>> On 2015/3/19 3:05, Will Deacon wrote:
>>>>> If you can get that in place, I'm not opposed to putting this into
>>>>> linux-next ahead of the firmware summit in San Jose next week. Note that
>>>>> this is not a commitment for 4.1, since I'm keen to see the outcomes of
>>>>> next week before setting anything in stone.
>>>>
>>>> OK, I will stick to this mailing list and respond as soon as I can.
>>>
>>> This doesn't even build for me:
>>>
>>>
>>> $ make ARCH=arm64 CROSS_COMPILE=aarch64-none-linux-gnu- allmodconfig
>>> $ make ARCH=arm64 CROSS_COMPILE=aarch64-none-linux-gnu- Image
>>>
>>> [...]
>>>
>>> In file included from drivers/xen/acpi.c:33:0:
>>
>> Sorry, I didn't build ACPI with XEN enabled on ARM64.
>>
>>> include/xen/acpi.h: In function ‘xen_acpi_sleep_register’:
>>> include/xen/acpi.h:102:3: error: ‘acpi_suspend_lowlevel’ undeclared (first
>>> use in this function)
>>>      acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
>>
>> acpi_suspend_lowlevel is defined only for X86 and IA64 for now.
>>
>>>      ^
>>> include/xen/acpi.h:102:3: note: each undeclared identifier is reported only
>>> once for each function it appears in
>>> drivers/xen/acpi.c: In function ‘xen_acpi_notify_hypervisor_state’:
>>> drivers/xen/acpi.c:61:2: error: implicit declaration of function
>>> ‘HYPERVISOR_dom0_op’ [-Werror=implicit-function-declaration]
>>>     HYPERVISOR_dom0_op(&op);
>>
>> And this is only for x86:
>> ./arch/x86/include/asm/xen/hypercall.h:HYPERVISOR_dom0_op(struct
>> xen_platform_op *platform_op)
>>
>>>     ^
>>> cc1: some warnings being treated as errors
>>> make[2]: *** [drivers/xen/acpi.o] Error 1
>>> make[2]: *** Waiting for unfinished jobs....
>>> make[1]: *** [drivers/xen] Error 2
>>> make[1]: *** Waiting for unfinished jobs....
>>> make: *** [drivers] Error 2
>>>
>>>
>>> Am I missing some other patches?
>>
>> No, you miss nothing. Parth Dixit is still working on XEN ACPI for
>> ARM64, before it's in full function, how about introduce a Kconfig
>> CONFIG_XEN_ACPI and let it depends on x86? when XEN ACPI for ARM64
>> comes, we can enable ARM64 for CONFIG_XEN_ACPI and fix the problems
>> above.
>>
>> Stefano, Parth, what do you think?
>
> To be precise, Parth is working on ACPI enablement for the Xen
> hypervisor at the moment (on the Xen tree), I don't think he has any
> patches for Linux (Dom0 is the key use case). The two works could be
> carried on in parallel, even though you would obviously need Parth's Xen
> patches to test the Linux side.

Sure, I saw a workaround patch for the Linux side, if Parth need
any help for the further development, I will be there.

>
> That said, I am OK with disabling ACPI for Xen on ARM and ARM64 for now
> -- I wouldn't want to cause any significant delays to your patch series.

Thanks!

Hanjun
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