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 <rrich...@marvell.com> --- This patch is a self-contained version of: [v2,05/10] EDAC/ghes: Setup DIMM label from DMI and use it in error reports https://lore.kernel.org/patchwork/patch/1229388/ [02/11] EDAC/ghes: Setup DIMM label from DMI and use it in error reports https://lore.kernel.org/patchwork/patch/1205891/ It applies on ras:edac-for-next commit id af8a9a36af01 ("EDAC/ghes: Setup DIMM label from DMI and use it in error reports"). v3 changes: * shortend function name to dimm_setup_label(), * let args stick out of find_dimm_by_handle() (line length 82 chars). --- 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 cb3dab56a875..c7d404629863 100644 --- a/drivers/edac/ghes_edac.c +++ b/drivers/edac/ghes_edac.c @@ -87,16 +87,31 @@ static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg) (*num_dimm)++; } -static int get_dimm_smbios_index(struct mem_ctl_info *mci, u16 handle) +static struct dimm_info *find_dimm_by_handle(struct mem_ctl_info *mci, u16 handle) { struct dimm_info *dimm; mci_for_each_dimm(mci, dimm) { if (dimm->smbios_handle == handle) - return dimm->idx; + return dimm; } - return -1; + return NULL; +} + +static void 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) @@ -179,9 +194,7 @@ 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 - */ + dimm_setup_label(dimm, entry->handle); if (dimm->nr_pages) { edac_dbg(1, "DIMM%i: %s size = %d MB%s\n", @@ -344,19 +357,17 @@ 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(mci, 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(mci, mem_err->mem_dev_handle); - if (index >= 0) - e->top_layer = index; + } } if (p > e->location) *(p - 1) = '\0'; -- 2.20.1