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Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier

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Hi Rafael, Zheng,

Welcome any comments!

Now, our patches are in tip tree, they are based on this
independent patch, we hope it can be merged earlier than our
patches to avoid ACPI Error. we need your advice and confirmation.

Thanks,
	dou.

At 09/13/2017 05:17 PM, Dou Liyang wrote:
> Linux uses acpi_early_init() to put the ACPI table management into the
> late stage from the early stage. This two stages are different. the
> mapped ACPI tables in early stage is temporary and should be unmapped,
> but in late stage, it is permanent and don't need to be unmapped.
>
> Originally, mapping and parsing the DMAR table should be in the late stage.
> However, Initializing interrupt delivery mode earlier will move it into
> the early stage. This causes an ACPI error warning when Linux reallocates
> the ACPI root tables.
>
> Commit b064a8fa77df ("ACPI / init: Switch over platform to the ACPI mode
> later") splits the ACPI early initialization code into acpi_early_init()
> and acpi_subsystem_init(). This makes acpi_early_init() more independently
>
> So, invoke acpi_early_init() earlier before late_time_init(), Keep the DMAR
> be mapped and parsed in late stage like before.
>
> Reported-by: Xiaolong Ye <xiaolong.ye@intel.com>
> Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
> Cc: linux-acpi@vger.kernel.org
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Zheng, Lv <lv.zheng@intel.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: x86@kernel.org
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Fenghua Yu <fenghua.yu@intel.com>
> Cc: linux-ia64@vger.kernel.org
> Cc: yinghai@kernel.org
> Cc: bhe@redhat.com
> Cc: bp@alien8.de
> ---
>  init/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/init/main.c b/init/main.c
> index 0ee9c686..2fb98a4 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -664,12 +664,12 @@ asmlinkage __visible void __init start_kernel(void)
>  	debug_objects_mem_init();
>  	setup_per_cpu_pageset();
>  	numa_policy_init();
> +	acpi_early_init();
>  	if (late_time_init)
>  		late_time_init();
>  	calibrate_delay();
>  	pidmap_init();
>  	anon_vma_init();
> -	acpi_early_init();
>  #ifdef CONFIG_X86
>  	if (efi_enabled(EFI_RUNTIME_SERVICES))
>  		efi_enter_virtual_mode();
>

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Thread

[PATCH v9 00/12] Unify the interrupt delivery mode and do its setup in advance Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 12/12] x86/apic: Remove the init_bsp_APIC() Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
    Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-27 03:50 +0200
      Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization  earlier Thomas Gleixner <tglx@linutronix.de> - 2017-09-27 09:30 +0200
        Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-27 09:40 +0200
    Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Borislav Petkov <bp@alien8.de> - 2017-09-27 11:10 +0200
      Re: [PATCH v9] ACPI / init: Invoke early ACPI initialization earlier Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-27 12:10 +0200
  [PATCH v9 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
    Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in  enlighten_pv system Juergen Gross <jgross@suse.com> - 2017-09-13 11:50 +0200
      Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in  enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 12:10 +0200
    [PATCH v10 10/12] x86/xen: Bypass intr mode setup in enlighten_pv system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 12:30 +0200
  [PATCH v9 03/12] x86/apic: Split local APIC timer setup from the APIC setup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 11/12] x86/time: Initialize interrupt mode behind timer init Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 02/12] x86/apic: Prepare for unifying the interrupt delivery modes setup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 09/12] x86/init: add intr_mode_init to x86_init_ops Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 05/12] x86/apic: Unify interrupt mode setup for SMP-capable system Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200
  [PATCH v9 06/12] x86/apic: Mark the apic_intr_mode extern for sanity check cleanup Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-13 11:20 +0200

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