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Date:	Mon, 28 Jul 2014 19:29:12 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>
CC:	Sudeep Holla <sudeep.holla@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...aro.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Stone <al.stone@...aro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH 01/19] ARM64 / ACPI: Get RSDP and ACPI boot-time tables



On 24/07/14 14:00, Hanjun Guo wrote:
> From: Al Stone <al.stone@...aro.org>
>
> As we want to get ACPI tables to parse and then use the information
> for system initialization, we should get the RSDP (Root System
> Description Pointer) first, it then locates Extended Root Description
> Table (XSDT) which contains all the 64-bit physical address that
> pointer to other boot-time tables.
>
> Introduce acpi.c and its related head file in this patch to provide
> fundamental needs of extern variables and functions for ACPI core,
> and then get boot-time tables as needed.
>    - asm/cpu.h need for ACPI core and will be updated in the future to
>      add definitions for arch_(un)register_cpu which are required for
>      ACPI based physical CPU hotplug;
>    - asm/acenv.h for arch specific ACPICA environments and
>      implementation;
>    - asm/acpi.h for arch specific variables and functions needed by
>      ACPI driver core;
>    - acpi.c for ARM64 related ACPI implementation for ACPI driver
>      core;
>
> acpi_boot_table_init() is introduced to get RSDP and boot-time tables,
> it will be called in setup_arch() before paging_init(), so we should
> use eary_memremap() mechanism here to get the RSDP and all the table
> pointers.
>
> Signed-off-by: Al Stone <al.stone@...aro.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>   arch/arm64/include/asm/acenv.h |   18 ++++++++++
>   arch/arm64/include/asm/acpi.h  |   41 ++++++++++++++++++++++
>   arch/arm64/include/asm/cpu.h   |   11 ++++++
>   arch/arm64/kernel/Makefile     |    1 +
>   arch/arm64/kernel/acpi.c       |   76 ++++++++++++++++++++++++++++++++++++++++
>   arch/arm64/kernel/setup.c      |    4 +++
>   6 files changed, 151 insertions(+)
>   create mode 100644 arch/arm64/include/asm/acenv.h
>   create mode 100644 arch/arm64/include/asm/acpi.h
>   create mode 100644 arch/arm64/include/asm/cpu.h
>   create mode 100644 arch/arm64/kernel/acpi.c
>
> diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h
> new file mode 100644
> index 0000000..3899ee6
> --- /dev/null
> +++ b/arch/arm64/include/asm/acenv.h
> @@ -0,0 +1,18 @@
> +/*
> + * ARM64 specific ACPICA environments and implementation
> + *
> + * Copyright (C) 2014, Linaro Ltd.
> + *   Author: Hanjun Guo <hanjun.guo@...aro.org>
> + *   Author: Graeme Gregory <graeme.gregory@...aro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef _ASM_ACENV_H
> +#define _ASM_ACENV_H
> +
> +#define ACPI_FLUSH_CPU_CACHE() WARN_ONCE(1, "Not currently supported on ARM64")
> +
> +#endif /* _ASM_ACENV_H */
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> new file mode 100644
> index 0000000..e8581ea
> --- /dev/null
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -0,0 +1,41 @@
> +/*
> + *  Copyright (C) 2013-2014, Linaro Ltd.
> + *     Author: Al Stone <al.stone@...aro.org>
> + *     Author: Graeme Gregory <graeme.gregory@...aro.org>
> + *     Author: Hanjun Guo <hanjun.guo@...aro.org>
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License version 2 as
> + *  published by the Free Software Foundation;
> + */
> +
> +#ifndef _ASM_ACPI_H
> +#define _ASM_ACPI_H
> +
> +/* Basic configuration for ACPI */
> +#ifdef CONFIG_ACPI
> +extern int acpi_disabled;
> +extern int acpi_noirq;
> +extern int acpi_pci_disabled;
> +extern int acpi_strict;

Until we need to enable workarounds, we should have acpi_strict
as macro rather than variable similar to IA64.

> +
> +static inline void disable_acpi(void)
> +{
> +       acpi_disabled = 1;
> +       acpi_pci_disabled = 1;
> +       acpi_noirq = 1;
> +}
> +
> +/*
> + * MADT must provide at least one GICC structure
> + * for GIC initialization, so CPU will be
> + * always available in MADT on ARM64
> + */
> +static inline bool acpi_has_cpu_in_madt(void)
> +{
> +       return 1;
> +}
> +

I don't see the user of this function in the series, it's better to
remove. Moreover the comment is so misleading. We will have CPU UID
not the CPU itself in MADT.

> +#endif /* CONFIG_ACPI */
> +
> +#endif /*_ASM_ACPI_H*/
> diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
> new file mode 100644
> index 0000000..cee7d3f
> --- /dev/null
> +++ b/arch/arm64/include/asm/cpu.h
> @@ -0,0 +1,11 @@
> +/*
> + *  Copyright (C) 2013-2014 ARM Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#ifndef __ASM_CPU_H
> +#define __ASM_CPU_H
> +
> +#endif
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index cdaedad..b568c26 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -29,6 +29,7 @@ arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
>   arm64-obj-$(CONFIG_JUMP_LABEL)         += jump_label.o
>   arm64-obj-$(CONFIG_KGDB)               += kgdb.o
>   arm64-obj-$(CONFIG_EFI)                        += efi.o efi-stub.o efi-entry.o
> +arm64-obj-$(CONFIG_ACPI)               += acpi.o
>
>   obj-y                                  += $(arm64-obj-y) vdso/
>   obj-m                                  += $(arm64-obj-m)
> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> new file mode 100644
> index 0000000..c62fce6
> --- /dev/null
> +++ b/arch/arm64/kernel/acpi.c
> @@ -0,0 +1,76 @@
> +/*
> + *  ARM64 Specific Low-Level ACPI Boot Support
> + *
> + *  Copyright (C) 2013-2014, Linaro Ltd.
> + *     Author: Al Stone <al.stone@...aro.org>
> + *     Author: Graeme Gregory <graeme.gregory@...aro.org>
> + *     Author: Hanjun Guo <hanjun.guo@...aro.org>
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License version 2 as
> + *  published by the Free Software Foundation.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/acpi.h>
> +#include <linux/cpumask.h>
> +#include <linux/memblock.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/bootmem.h>
> +#include <linux/smp.h>
> +
> +/*
> + * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
> + * variable is still required by the ACPI core
> + */
> +u32 acpi_rsdt_forced;

This looks like yet another stray variable not used anywhere including
core ACPI

> +
> +int acpi_noirq;                        /* skip ACPI IRQ initialization */
> +int acpi_strict;
> +int acpi_disabled;
> +EXPORT_SYMBOL(acpi_disabled);
> +
> +int acpi_pci_disabled;         /* skip ACPI PCI scan and IRQ initialization */
> +EXPORT_SYMBOL(acpi_pci_disabled);
> +
> +/*
> + * __acpi_map_table() will be called before page_init(), so early_ioremap()
> + * or early_memremap() should be called here to for ACPI table mapping.
> + */
> +char *__init __acpi_map_table(unsigned long phys, unsigned long size)
> +{
> +       if (!phys || !size)
> +               return NULL;
> +
> +       return early_memremap(phys, size);
> +}
> +
> +void __init __acpi_unmap_table(char *map, unsigned long size)
> +{
> +       if (!map || !size)
> +               return;
> +
> +       early_iounmap(map, size);

Why not early_memunmap for consistency ?
Also now there's generic implementation of early mappings does it make
sense to move this also to acpi core ?

Regards,
Sudeep

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