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Subject[PATCH] EDAC, ghes: use CPER module handles to locate DIMMs
Date
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.

Signed-off-by: Fan Wu <wufan@codeaurora.org>
---
drivers/edac/ghes_edac.c | 36 +++++++++++++++++++++++++++++++++---
include/linux/edac.h | 2 ++
2 files changed, 35 insertions(+), 3 deletions(-)

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 */
};

/**
--
2.7.4
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