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SubjectRe: [PATCH] EDAC, ghes: use CPER module handles to locate DIMMs
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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 */
> };
>
> /**
>

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