linux-kernel - Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE

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Message-ID: <5540EB27.8060507@amd.com>
Date:	Wed, 29 Apr 2015 09:31:03 -0500
From:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	<rjw@...ysocki.net>, <lenb@...nel.org>, <will.deacon@....com>,
	<al.stone@...aro.org>, <arnd@...db.de>,
	<linaro-acpi@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <leo.duran@....com>,
	<hanjun.guo@...aro.org>, <msalter@...hat.com>,
	<grant.likely@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	"Charles Garcia-Tobin" <Charles.Garcia-Tobin@....com>
Subject: Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA



On 04/29/2015 09:04 AM, Catalin Marinas wrote:
> On Wed, Apr 29, 2015 at 08:44:08AM -0500, Suravee Suthikulpanit wrote:
>>  From ACPIv6 (http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf),
>> section 6.2.17 _CCA states that ARM platforms require ACPI _CCA object to be
>> specified for DMA-cabpable devices. This patch introduces ACPI_MUST_HAVE_CCA
>> in arm and arm64 Kconfig to specify such requirement.
>>
>> Note that when _CCA is required, if it is missing in the DSDT. ACPI driver
>> will default to setting up devices as non-coherent.
>>
>> Signed-off-by: Mark Salter <msalter@...hat.com>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> ---
>>   arch/arm/Kconfig     | 1 +
>>   arch/arm64/Kconfig   | 1 +
>>   drivers/acpi/Kconfig | 3 +++
>>   3 files changed, 5 insertions(+)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index 45df48b..2a0d036 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -1,6 +1,7 @@
>>   config ARM
>>   	bool
>>   	default y
>> +	select ACPI_MUST_HAVE_CCA if ACPI
>>   	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>>   	select ARCH_HAS_ELF_RANDOMIZE
>>   	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>
> Any plans for ACPI on 32-bit ARM?
>

Not that I am aware, but I could be totally wrong. The reason I am 
adding this here for 32-bit ARM is because the ACPI spec mentioned this.

If you think this is not necessary until we introduce ACPI for ARM32, it 
can be removed.

Thanks,

Suravee
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