linux-kernel - Re: [PATCH 03/20] ARM64 / ACPI: Introduce the skeleton of

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Date:	Mon, 20 Jan 2014 17:20:38 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <Sudeep.Holla@....com>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	Al Stone <al.stone@...aro.org>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>
Subject: Re: [PATCH 03/20] ARM64 / ACPI: Introduce the skeleton of _PDC related
 for ARM64

On 2014-1-17 22:25, Sudeep Holla wrote:
> On 17/01/14 12:24, Hanjun Guo wrote:
>> The _PDC (Processor Driver Capabilities) object provides OSPM a
>> mechanism to convey to the platform the capabilities supported
>> by OSPM for processor power management.
>>
>> OSPM evaluates _PDC prior to evaluating any other processor
>> power management objects returning configuration information.
>>
>> This patch introduces the skeleton of _PDC related file to make
>> ACPI core can be compiled on ARM64.
>>
>> Signed-off-by: Al Stone <al.stone@...aro.org>
>> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
>>  arch/arm64/include/asm/acpi.h      |   32 ++++++++++++++++++++++++++++++++
>>  arch/arm64/include/asm/processor.h |    2 ++
>>  arch/arm64/kernel/process.c        |    3 +++
>>  3 files changed, 37 insertions(+)
>>  create mode 100644 arch/arm64/include/asm/acpi.h
>>
>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
>> new file mode 100644
>> index 0000000..cf19dc6
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/acpi.h
>> @@ -0,0 +1,32 @@
>> +/*
>> + *  Copyright (C) 2013, Al Stone <al.stone@...aro.org>
>> + *
>> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> + *
>> + *  This program is free software; you can redistribute it and/or modify
>> + *  it under the terms of the GNU General Public License as published by
>> + *  the Free Software Foundation; either version 2 of the License, or
>> + *  (at your option) any later version.
>> + *
>> + *  This program is distributed in the hope that it will be useful,
>> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + *  GNU General Public License for more details.
>> + *
>> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> + */
>> +
>> +#ifndef _ASM_ARM64_ACPI_H
>> +#define _ASM_ARM64_ACPI_H
>> +
>> +static inline bool arch_has_acpi_pdc(void)
>> +{
>> +	return false;	/* always false for now */
>> +}
>> +
>> +static inline void arch_acpi_set_pdc_bits(u32 *buf)
>> +{
>> +	return;
>> +}
>> +
>> +#endif /*_ASM_ARM64_ACPI_H*/
>> diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
>> index 45b20cd..50ce951 100644
>> --- a/arch/arm64/include/asm/processor.h
>> +++ b/arch/arm64/include/asm/processor.h
>> @@ -162,6 +162,8 @@ static inline void spin_lock_prefetch(const void *x)
>>  
>>  #define HAVE_ARCH_PICK_MMAP_LAYOUT
>>  
>> +extern unsigned long    boot_option_idle_override;
>> +
>>  #endif
>>  
>>  #endif /* __ASM_PROCESSOR_H */
>> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
>> index de17c89..13d3d7f 100644
>> --- a/arch/arm64/kernel/process.c
>> +++ b/arch/arm64/kernel/process.c
>> @@ -89,6 +89,9 @@ void arch_cpu_idle_prepare(void)
>>  	local_fiq_enable();
>>  }
>>  
>> +unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
>> +EXPORT_SYMBOL(boot_option_idle_override);
>> +
> 
> This is what I mentioned in other email. Do we really foresee use of this in
> ARM64 or it's just added to avoid build issues ?

Just avoid build issues, can not foresee use of this in ARM64 :)

Thanks
Hanjun

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