linux-kernel - Re: [PATCH v3 6/7] ACPI: enable ACPI_DBG2_TABLE on ARM64

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Date:	Thu, 3 Mar 2016 07:51:49 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Aleksey Makarov <amakarov.linux@...il.com>,
	Aleksey Makarov <aleksey.makarov@...aro.org>,
	linux-acpi@...r.kernel.org
Cc:	Matthias Brugger <mbrugger@...e.com>,
	Russell King <linux@....linux.org.uk>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Christopher Covington <cov@...eaurora.org>,
	linux-serial@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, Al Stone <ahs3@...hat.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 6/7] ACPI: enable ACPI_DBG2_TABLE on ARM64

On 03/03/2016 03:41 AM, Aleksey Makarov wrote:
> 
> 
> On 03/01/2016 08:25 PM, Peter Hurley wrote:
>> On 03/01/2016 09:02 AM, Aleksey Makarov wrote:
>>>
>>>
>>> On 03/01/2016 05:52 PM, Peter Hurley wrote:
>>>> On 02/29/2016 04:42 AM, Aleksey Makarov wrote:
>>>>> SBBR mentions DBG2 as a mandatory ACPI table.
>>>>> So enable it for ARM64
>>>>
>>>> Why does this have to be opted-in per-arch?
>>>
>>> DBG2 can specify earlycons.  They should start as soon as possible.
>>> On ARM64 it is just after boot tables become available (in arch_init()).
>>> So it has to be per-arch unless we decide not to start earlycons on 
>>> DBG2 ports.
>>
>> OF does all that already but the earlycon opt-in is not per-arch.
> 
> In the last next-XXXX kernel support for OF earlycon depends on
> CONFIG_OF_EARLY_FLATTREE which *is* per-arch.

That's true.

(of_setup_earlycon() was really always CONFIG_OF_EARLY_FLATTREE because
its lone caller was CONFIG_OF_EARLY_FLATTREE).

> Probably we need the same kind of configuration option here,
> something like CONFIG_ACPI_BOOT_TABLES instead of ACPI_DBG2_TABLE.

I'll let acpi maintainers sort that.

>>>>> Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
>>>>> ---
>>>>>  arch/arm64/Kconfig       | 1 +
>>>>>  arch/arm64/kernel/acpi.c | 2 ++
>>>>>  2 files changed, 3 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>>>>> index 9dc5209..0b614d4 100644
>>>>> --- a/arch/arm64/Kconfig
>>>>> +++ b/arch/arm64/Kconfig
>>>>> @@ -3,6 +3,7 @@ config ARM64
>>>>>  	select ACPI_CCA_REQUIRED if ACPI
>>>>>  	select ACPI_GENERIC_GSI if ACPI
>>>>>  	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
>>>>> +	select ACPI_DBG2_TABLE if ACPI
>>>>>  	select ARCH_HAS_DEVMEM_IS_ALLOWED
>>>>>  	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>>>>>  	select ARCH_HAS_ELF_RANDOMIZE
>>>>> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
>>>>> index d1ce8e2..3370046 100644
>>>>> --- a/arch/arm64/kernel/acpi.c
>>>>> +++ b/arch/arm64/kernel/acpi.c
>>>>> @@ -208,6 +208,8 @@ void __init acpi_boot_table_init(void)
>>>>>  		pr_err("Failed to init ACPI tables\n");
>>>>>  		if (!param_acpi_force)
>>>>>  			disable_acpi();
>>>>> +	} else {
>>>>> +		acpi_probe_device_table(dbg2);
>>>>>  	}
>>>>>  }
>>>>>  
>>>>>
>>>>
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>

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