linux-kernel - Re: [PATCH -v2 3/7] x86, NMI, Rename memory parity error to PCI SERR error

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Message-ID: <20100927080106.GA32222@erda.amd.com>
Date:	Mon, 27 Sep 2010 10:01:06 +0200
From:	Robert Richter <robert.richter@....com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -v2 3/7] x86, NMI, Rename memory parity error to PCI
 SERR error

On 26.09.10 20:57:02, Huang Ying wrote:
> memory parity error is only valid for IBM PC-AT, newer machine use 7
> bit (0x80) of 0x61 port for PCI SERR. While memory error is usually
> reported via MCE. So corresponding function name and kernel log string
> is changed.
> 
> But on some machines, PCI SERR line is still used to report memory
> errors. This is used by EDAC, so corresponding EDAC call is reserved.
> 
> 
> v2:
> 
> - EDAC call in pci_serr_error is reserved.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>
> ---
>  arch/x86/include/asm/mach_traps.h |    6 +++---
>  arch/x86/kernel/traps.c           |   21 ++++++++++-----------
>  2 files changed, 13 insertions(+), 14 deletions(-)
> 
> --- a/arch/x86/include/asm/mach_traps.h
> +++ b/arch/x86/include/asm/mach_traps.h
> @@ -9,11 +9,11 @@
>  
>  #define NMI_REASON_PORT		0x61
>  
> -#define NMI_REASON_MEMPAR	0x80
> +#define NMI_REASON_SERR		0x80
>  #define NMI_REASON_IOCHK	0x40
> -#define NMI_REASON_MASK		(NMI_REASON_MEMPAR | NMI_REASON_IOCHK)
> +#define NMI_REASON_MASK		(NMI_REASON_SERR | NMI_REASON_IOCHK)
>  
> -#define NMI_REASON_CLEAR_MEMPAR	0x04
> +#define NMI_REASON_CLEAR_SERR	0x04

I already commented on this, patch #1 and #3 are basically the same in
most parts which should be merged. What remains then in this patch is
the modified printk() and the comment. Both could be added to #1 too
which is then some sort of code cleanup patch.

>  #define NMI_REASON_CLEAR_IOCHK	0x08
>  #define NMI_REASON_CLEAR_MASK	0x0f
>  
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -301,15 +301,14 @@ gp_in_kernel:
>  }
>  
>  static notrace __kprobes void
> -mem_parity_error(unsigned char reason, struct pt_regs *regs)
> +pci_serr_error(unsigned char reason, struct pt_regs *regs)
>  {
> -	printk(KERN_EMERG
> -		"Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
> -			reason, smp_processor_id());
> -
> -	printk(KERN_EMERG
> -		"You have some hardware problem, likely on the PCI bus.\n");
> +	printk(KERN_EMERG "NMI: PCI system error (SERR).\n");

You should keep reporting the cpu id to identify the affected node and
also the reason.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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