linux-kernel - Re: [PATCH] EDAC, ghes: use CPER module handles to locate DIMMs

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Message-ID: <5eab89c6-c063-cbc2-4d02-459faf87698a@arm.com>
Date:   Thu, 30 Aug 2018 17:34:27 +0100
From:   James Morse <james.morse@....com>
To:     Zhengqiang <zhengqiang10@...wei.com>
Cc:     Fan Wu <wufan@...eaurora.org>, mchehab@...nel.org, bp@...en8.de,
        baicar.tyler@...il.com, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] EDAC, ghes: use CPER module handles to locate DIMMs

Hi Zhengqiang,

On 29/08/18 19:33, Fan Wu wrote:
> The current ghes_edac driver does not update per-dimm error
> counters when reporting memory errors, because there is no
> platform-independent way to find DIMMs based on the error
> information provided by firmware. This patch offers a solution
> for platforms whose firmwares provide valid module handles
> (SMBIOS type 17) in error records. In this case ghes_edac will
> use the module handles to locate DIMMs and thus makes per-dimm
> error reporting possible.

Does your platform set CPER_MEM_VALID_MODULE_HANDLE in GHES Memory errors? If
so, any chance you could test this patch on your platform? [0]
(original patch: https://lore.kernel.org/patchwork/patch/978928/)

Thanks,

James

[0] https://marc.info/?l=linux-edac&m=152603960002324


> diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
> index 473aeec..db527f0 100644
> --- a/drivers/edac/ghes_edac.c
> +++ b/drivers/edac/ghes_edac.c
> @@ -81,6 +81,26 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
>  		(*num_dimm)++;
>  }
>  
> +static int ghes_edac_dimm_index(u16 handle)
> +{
> +	struct mem_ctl_info *mci;
> +	int i;
> +
> +	if (!ghes_pvt)
> +		return -1;
> +
> +	mci = ghes_pvt->mci;
> +
> +	if (!mci)
> +		return -1;
> +
> +	for (i = 0; i < mci->tot_dimms; i++) {
> +		if (mci->dimms[i]->smbios_handle == handle)
> +			return i;
> +	}
> +	return -1;
> +}
> +
>  static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
>  {
>  	struct ghes_edac_dimm_fill *dimm_fill = arg;
> @@ -177,6 +197,8 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
>  				entry->total_width, entry->data_width);
>  		}
>  
> +		dimm->smbios_handle = entry->handle;
> +
>  		dimm_fill->count++;
>  	}
>  }
> @@ -327,12 +349,20 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
>  		p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
>  	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
>  		const char *bank = NULL, *device = NULL;
> +		int index = -1;
> +
>  		dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
> +		p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
> +			     mem_err->mem_dev_handle);
>  		if (bank != NULL && device != NULL)
>  			p += sprintf(p, "DIMM location:%s %s ", bank, device);
> -		else
> -			p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
> -				     mem_err->mem_dev_handle);
> +
> +		index = ghes_edac_dimm_index(mem_err->mem_dev_handle);
> +		if (index >= 0) {
> +			e->top_layer = index;
> +			e->enable_per_layer_report = true;
> +		}
> +
>  	}
>  	if (p > e->location)
>  		*(p - 1) = '\0';
> diff --git a/include/linux/edac.h b/include/linux/edac.h
> index bffb978..a45ce1f 100644
> --- a/include/linux/edac.h
> +++ b/include/linux/edac.h
> @@ -451,6 +451,8 @@ struct dimm_info {
>  	u32 nr_pages;			/* number of pages on this dimm */
>  
>  	unsigned csrow, cschannel;	/* Points to the old API data */
> +
> +	u16 smbios_handle;              /* Handle for SMBIOS type 17 */
>  };
>  
>  /**
>