linux-kernel - Re: [PATCH v5] cper, apei, mce: Pass x86 CPER through the MCA handling chain

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Message-ID: <87a6vv9hch.fsf@kokedama.swc.toshiba.co.jp>
Date:   Fri, 06 Nov 2020 14:36:46 +0900
From:   Punit Agrawal <punit1.agrawal@...hiba.co.jp>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <linux-edac@...r.kernel.org>,
        <linux-efi@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        "Ard Biesheuvel" <ardb@...nel.org>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH v5] cper, apei, mce: Pass x86 CPER through the MCA handling chain

Hi Smita,

Smita Koralahalli <Smita.KoralahalliChannabasappa@....com> writes:

> Linux Kernel uses ACPI Boot Error Record Table (BERT) to report fatal
> errors that occurred in a previous boot. The MCA errors in the BERT are
> reported using the x86 Processor Error Common Platform Error Record (CPER)
> format. Currently, the record prints out the raw MSR values and AMD relies
> on the raw record to provide MCA information.
>
> Extract the raw MSR values of MCA registers from the BERT and feed it into
> the standard mce_log() function through the existing x86/MCA RAS
> infrastructure. This will result in better decoding from the EDAC MCE
> decoder or the default notifier.
>
> The implementation is SMCA specific as the raw MCA register values are
> given in the register offset order of the MCAX address space.
>
> [ Fix a build breakage in patch v1. ]
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>

[...]

> diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c
> index 2531de49f56c..438ed9eff6d0 100644
> --- a/drivers/firmware/efi/cper-x86.c
> +++ b/drivers/firmware/efi/cper-x86.c
> @@ -2,6 +2,7 @@
>  // Copyright (C) 2018, Advanced Micro Devices, Inc.
>  
>  #include <linux/cper.h>
> +#include <linux/acpi.h>

Did you mean to include <asm/acpi.h>?

>  
>  /*
>   * We don't need a "CPER_IA" prefix since these are all locally defined.
> @@ -347,9 +348,13 @@ void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc)
>  			       ctx_info->mm_reg_addr);
>  		}
>  
> -		printk("%sRegister Array:\n", newpfx);
> -		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize,
> -			       (ctx_info + 1), ctx_info->reg_arr_size, 0);
> +		if (ctx_info->reg_ctx_type != CTX_TYPE_MSR ||
> +		    arch_apei_report_x86_error(ctx_info, proc->lapic_id)) {
> +			printk("%sRegister Array:\n", newpfx);
> +			print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16,
> +				       groupsize, (ctx_info + 1),
> +				       ctx_info->reg_arr_size, 0);
> +		}
>  
>  		ctx_info = (struct cper_ia_proc_ctx *)((long)ctx_info + size);
>  	}

With that addressed,

FWIW,

Reviewed-by: Punit Agrawal <punit1.agrawal@...hiba.co.jp>

Thanks,
Punit