linux-kernel - Re: [PATCH 02/19] ARM64 / ACPI: Introduce early

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Date:	Tue, 29 Jul 2014 21:10:21 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>
CC:	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...aro.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....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>,
	Al Stone <al.stone@...aro.org>
Subject: Re: [PATCH 02/19] ARM64 / ACPI: Introduce early_param for "acpi"

On 2014-7-29 2:35, Sudeep Holla wrote:
> 
> 
> On 24/07/14 14:00, Hanjun Guo wrote:
>> From: Al Stone <al.stone@...aro.org>
>>
>> Introduce two early parameters for "acpi", one is the parameter
>> to disable ACPI on ARM64 and another one is acpi=strict to disable
>> out-of-spec workarounds.
>>
>> Reviewed-by: Grant Likely <grant.likely@...aro.org>
>> 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>
>> ---
>>   Documentation/kernel-parameters.txt |    3 ++-
>>   arch/arm64/kernel/acpi.c            |   21 +++++++++++++++++++++
>>   2 files changed, 23 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/kernel-parameters.txt
>> b/Documentation/kernel-parameters.txt
>> index b7fa2f5..d130bd5 100644
>> --- a/Documentation/kernel-parameters.txt
>> +++ b/Documentation/kernel-parameters.txt
>> @@ -165,7 +165,7 @@ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10,
>> 2^20, and 2^30
>>   bytes respectively. Such letter suffixes can also be entirely omitted.
>>
>>
>> -    acpi=        [HW,ACPI,X86]
>> +    acpi=        [HW,ACPI,X86,ARM]
>>               Advanced Configuration and Power Interface
>>               Format: { force | off | strict | noirq | rsdt }
>>               force -- enable ACPI if default was off
>> @@ -175,6 +175,7 @@ bytes respectively. Such letter suffixes can also be
>> entirely omitted.
>>                   strictly ACPI specification compliant.
>>               rsdt -- prefer RSDT over (default) XSDT
>>               copy_dsdt -- copy DSDT to memory
>> +            For ARM64, ONLY "off" and "strict" are available.
>>
>>               See also Documentation/power/runtime_pm.txt, pci=noacpi
>>
>> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
>> index c62fce6..ac78e4e 100644
>> --- a/arch/arm64/kernel/acpi.c
>> +++ b/arch/arm64/kernel/acpi.c
>> @@ -74,3 +74,24 @@ void __init acpi_boot_table_init(void)
>>           return;
>>       }
>>   }
>> +
>> +static int __init parse_acpi(char *arg)
>> +{
>> +    if (!arg)
>> +        return -EINVAL;
>> +
>> +    /* "acpi=off" disables both ACPI table parsing and interpreter */
>> +    if (strcmp(arg, "off") == 0) {
>> +        disable_acpi();
>> +    }
>> +    /* acpi=strict disables out-of-spec workarounds */
>> +    else if (strcmp(arg, "strict") == 0) {
>> +        acpi_strict = 1;
> 
> This should be default set as I mentioned in patch#1. We can introduce
> this option if required in future.

Agreed, Let's keep it strict in the beginning to support ACPI.

Thanks
Hanjun

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