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

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Message-ID: <55423261.4050008@linaro.org>
Date:	Thu, 30 Apr 2015 21:47:13 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
CC:	al.stone@...aro.org, arnd@...db.de, linaro-acpi@...ts.linaro.org,
	rjw@...ysocki.net, will.deacon@....com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	leo.duran@....com, msalter@...hat.com, grant.likely@...aro.org,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	linux-arm-kernel@...ts.infradead.org, lenb@...nel.org
Subject: Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA

On 2015年04月29日 22:42, Catalin Marinas wrote:
> On Wed, Apr 29, 2015 at 09:31:03AM -0500, Suravee Suthikulpanit wrote:
>>
>>
>> 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.
>
> I think it should be removed (as long as ACPI cannot be selected on
> arm32).

I agree.

Now there is no plan for ARM32 ACPI as I know, ACPI for ARM targets
for ARM64 based enterprise system at now.

Thanks
Hanjun
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