linux-kernel - Re: [PATCH v3 6/7] ACPI: enable ACPI_DBG2

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Date:	Tue, 1 Mar 2016 09:25:34 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Aleksey Makarov <aleksey.makarov@...aro.org>,
	linux-acpi@...r.kernel.org
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Al Stone <ahs3@...hat.com>,
	Christopher Covington <cov@...eaurora.org>,
	Matthias Brugger <mbrugger@...e.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v3 6/7] ACPI: enable ACPI_DBG2_TABLE on ARM64

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.


>>> 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);
>>>  	}
>>>  }
>>>  
>>>
>>