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Date: Wed, 22 Apr 2020 13:58:09 +0200
From: Robert Richter <rrichter@...vell.com>
To: Borislav Petkov <bp@...en8.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Tony Luck <tony.luck@...el.com>
CC: James Morse <james.morse@....com>,
Aristeu Rozanski <aris@...hat.com>,
Robert Richter <rrichter@...vell.com>,
Matthias Brugger <mbrugger@...e.com>,
<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 05/10] EDAC/ghes: Setup DIMM label from DMI and use it in error reports
The ghes driver reports errors with 'unknown label' even if the actual
DIMM label is known, e.g.:
EDAC MC0: 1 CE Single-bit ECC on unknown label (node:0 card:0
module:0 rank:1 bank:0 col:13 bit_pos:16 DIMM location:N0 DIMM_A0
page:0x966a9b3 offset:0x0 grain:1 syndrome:0x0 - APEI location:
node:0 card:0 module:0 rank:1 bank:0 col:13 bit_pos:16 DIMM
location:N0 DIMM_A0 status(0x0000000000000400): Storage error in
DRAM memory)
Fix this by using struct dimm_info's label string in error reports:
EDAC MC0: 1 CE Single-bit ECC on N0 DIMM_A0 (node:0 card:0 module:0
rank:1 bank:515 col:14 bit_pos:16 DIMM location:N0 DIMM_A0
page:0x99223d8 offset:0x0 grain:1 syndrome:0x0 - APEI location:
node:0 card:0 module:0 rank:1 bank:515 col:14 bit_pos:16 DIMM
location:N0 DIMM_A0 status(0x0000000000000400): Storage error in
DRAM memory)
The labels are initialized by reading the bank and device strings from
DMI. Now, the label information can also read from sysfs. E.g. a
ThunderX2 system will show the following:
/sys/devices/system/edac/mc/mc0/dimm0/dimm_label:N0 DIMM_A0
/sys/devices/system/edac/mc/mc0/dimm1/dimm_label:N0 DIMM_B0
/sys/devices/system/edac/mc/mc0/dimm2/dimm_label:N0 DIMM_C0
/sys/devices/system/edac/mc/mc0/dimm3/dimm_label:N0 DIMM_D0
/sys/devices/system/edac/mc/mc0/dimm4/dimm_label:N0 DIMM_E0
/sys/devices/system/edac/mc/mc0/dimm5/dimm_label:N0 DIMM_F0
/sys/devices/system/edac/mc/mc0/dimm6/dimm_label:N0 DIMM_G0
/sys/devices/system/edac/mc/mc0/dimm7/dimm_label:N0 DIMM_H0
/sys/devices/system/edac/mc/mc0/dimm8/dimm_label:N1 DIMM_I0
/sys/devices/system/edac/mc/mc0/dimm9/dimm_label:N1 DIMM_J0
/sys/devices/system/edac/mc/mc0/dimm10/dimm_label:N1 DIMM_K0
/sys/devices/system/edac/mc/mc0/dimm11/dimm_label:N1 DIMM_L0
/sys/devices/system/edac/mc/mc0/dimm12/dimm_label:N1 DIMM_M0
/sys/devices/system/edac/mc/mc0/dimm13/dimm_label:N1 DIMM_N0
/sys/devices/system/edac/mc/mc0/dimm14/dimm_label:N1 DIMM_O0
/sys/devices/system/edac/mc/mc0/dimm15/dimm_label:N1 DIMM_P0
Since dimm_labels can be rewritten, that label will be used in a later
error report:
# echo foobar >/sys/devices/system/edac/mc/mc0/dimm0/dimm_label
# # some error injection here
# dmesg | grep foobar
[ 2119.784489] EDAC MC0: 1 CE Single-bit ECC on foobar (node:0 card:0
module:0 rank:0 bank:769 col:1 bit_pos:16 DIMM location:foobar
page:0x94d027 offset:0x0 grain:1 syndrome:0x0 - APEI location: node:0
card:0 module:0 rank:0 bank:769 col:1 bit_pos:16 DIMM location:foobar
status(0x0000000000000400): Storage error in DRAM memory)
Signed-off-by: Robert Richter <rrichter@...vell.com>
---
drivers/edac/ghes_edac.c | 43 +++++++++++++++++++++++++---------------
1 file changed, 27 insertions(+), 16 deletions(-)
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 23adb7674f9b..a5890afa9c71 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -153,7 +153,7 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
(*num_dimm)++;
}
-static int get_dimm_smbios_index(u16 handle)
+static struct dimm_info *find_dimm_by_handle(u16 handle)
{
struct ghes_dimm *ghes_dimm;
@@ -161,10 +161,25 @@ static int get_dimm_smbios_index(u16 handle)
list_for_each_entry(ghes_dimm, &ghes_dimm_list, entry) {
if (ghes_dimm->handle == handle)
- return ghes_dimm->dimm->idx;
+ return ghes_dimm->dimm;
}
- return -1;
+ return NULL;
+}
+
+static void ghes_dimm_setup_label(struct dimm_info *dimm, u16 handle)
+{
+ const char *bank = NULL, *device = NULL;
+
+ dmi_memdev_name(handle, &bank, &device);
+
+ /* both strings must be non-zero */
+ if (bank && *bank && device && *device)
+ snprintf(dimm->label, sizeof(dimm->label),
+ "%s %s", bank, device);
+ else
+ snprintf(dimm->label, sizeof(dimm->label),
+ "unknown memory (handle: 0x%.4x)", handle);
}
static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
@@ -248,9 +263,7 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
dimm->dtype = DEV_UNKNOWN;
dimm->grain = 128; /* Likely, worse case */
- /*
- * FIXME: It shouldn't be hard to also fill the DIMM labels
- */
+ ghes_dimm_setup_label(dimm, entry->handle);
if (dimm->nr_pages) {
edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
@@ -416,19 +429,17 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION)
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;
+ struct dimm_info *dimm;
- dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
- if (bank != NULL && device != NULL)
- p += sprintf(p, "DIMM location:%s %s ", bank, device);
- else
+ dimm = find_dimm_by_handle(mem_err->mem_dev_handle);
+ if (dimm) {
+ e->top_layer = dimm->idx;
+ strcpy(e->label, dimm->label);
+ p += sprintf(p, "DIMM location:%s ", dimm->label);
+ } else {
p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
mem_err->mem_dev_handle);
-
- index = get_dimm_smbios_index(mem_err->mem_dev_handle);
- if (index >= 0)
- e->top_layer = index;
+ }
}
if (p > e->location)
*(p - 1) = '\0';
--
2.20.1
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