linux-kernel - Re: [RFC part1 PATCH 4/7] ARM64 / ACPI: Introduce the skeleton of

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Date:	Tue, 3 Dec 2013 11:12:14 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Linaro Patches <patches@...aro.org>,
	Olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC part1 PATCH 4/7] ARM64 / ACPI: Introduce the skeleton of
 _PDC related for ARM64

On Tue, Dec 3, 2013 at 10:36 AM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> The _PDC (Processor Driver Capabilities) object provides OSPM a
> mechanism to convey to the platform the capabilities supported
> by OSPM for processor power management.
>
> OSPM evaluates _PDC prior to evaluating any other processor
> power management objects returning configuration information.
>
> This patch introduces the skeleton of _PDC related file to make
> ACPI core can be compiled on ARM64.
>
> 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>
> ---
>  arch/arm64/include/asm/acpi.h      |   32 ++++++++++++++++++++++++++++++++
>  arch/arm64/include/asm/processor.h |   11 +++++++++++
>  arch/arm64/kernel/process.c        |    5 +++++
>  3 files changed, 48 insertions(+)
>  create mode 100644 arch/arm64/include/asm/acpi.h
>
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> new file mode 100644
> index 0000000..c186f5b
> --- /dev/null
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -0,0 +1,32 @@
> +/*
> + *  Copyright (C) 2013, Al Stone <al.stone@...aro.org>
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; either version 2 of the License, or
> + *  (at your option) any later version.
> + *
> + *  This program is distributed in the hope that it will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + */
> +
> +#ifndef _ASM_ARM_ACPI_H
> +#define _ASM_ARM_ACPI_H
> +
> +static inline bool arch_has_acpi_pdc(void)
> +{
> +       return false;   /* always false for now */
> +}
> +
> +static inline void arch_acpi_set_pdc_bits(u32 *buf)
> +{
> +       return;
> +}
> +
> +#endif /*_ASM_ARM_ACPI_H*/
> diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
> index 45b20cd..73b1d3a 100644
> --- a/arch/arm64/include/asm/processor.h
> +++ b/arch/arm64/include/asm/processor.h
> @@ -162,6 +162,17 @@ static inline void spin_lock_prefetch(const void *x)
>
>  #define HAVE_ARCH_PICK_MMAP_LAYOUT
>
> +#ifdef CONFIG_ACPI

The ifdef is not necessary.

> +/*
> + * FIXME: there is no MWAIT on ARM, should be WFI or something else,
> + * and modify drivers/acpi/processor_core.c too.
> + */
> +enum idle_boot_override { IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT,
> +                       IDLE_POLL, IDLE_FORCE_MWAIT };
> +
> +extern unsigned long    boot_option_idle_override;
> +#endif
--
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