@@ -615,7 +615,6 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
struct dimm_fill dimm_fill;
int rc = 0, num_dimm = 0;
struct mem_ctl_info *mci;
- bool fake = false;
int idx;
if (IS_ENABLED(CONFIG_X86)) {
@@ -643,23 +642,43 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
if (rc < 0)
goto unlock;
- /* Check if we've got a bogus BIOS */
- if (num_dimm == 0) {
- fake = true;
- num_dimm = 1;
- }
+ if (!num_dimm) {
+ /*
+ * Bogus BIOS: Ignore DMI topology and use a single MC
+ * with only one DIMM for the whole address range to
+ * catch all errros.
+ */
+ struct dimm_info *dimm;
+ LIST_HEAD(empty);
- mci = ghes_mc_create(dev, 0, num_dimm);
- if (!mci) {
- rc = -ENOMEM;
- goto unlock;
- }
+ mci = ghes_mc_create(dev, 0, 1);
+ if (!mci) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
+
+ dimm = edac_get_dimm_by_index(mci, 0);
+
+ dimm->nr_pages = 1;
+ dimm->grain = 128;
+ dimm->mtype = MEM_UNKNOWN;
+ dimm->dtype = DEV_UNKNOWN;
+ dimm->edac_mode = EDAC_SECDED;
+
+ snprintf(dimm->label, sizeof(dimm->label), "unknown memory");
+
+ rc = ghes_mc_add_or_free(mci, &empty);
+ if (rc)
+ goto unlock;
- if (fake) {
pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n");
pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n");
pr_info("work on such system. Use this driver with caution\n");
- } else if (idx < 0) {
+
+ goto out;
+ }
+
+ if (idx < 0) {
pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n");
pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n");
pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
@@ -668,26 +687,23 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
pr_info("This system has %d DIMM sockets.\n", num_dimm);
}
- INIT_LIST_HEAD(&dimm_fill.dimms);
+ mci = ghes_mc_create(dev, 0, num_dimm);
+ if (!mci) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
- if (!fake) {
- dimm_fill.index = 0;
- dimm_fill.mci = mci;
- dmi_walk(ghes_edac_dmidecode, &dimm_fill);
- } else {
- struct dimm_info *dimm = edac_get_dimm_by_index(mci, 0);
+ dimm_fill.index = 0;
+ dimm_fill.mci = mci;
+ INIT_LIST_HEAD(&dimm_fill.dimms);
- dimm->nr_pages = 1;
- dimm->grain = 128;
- dimm->mtype = MEM_UNKNOWN;
- dimm->dtype = DEV_UNKNOWN;
- dimm->edac_mode = EDAC_SECDED;
- }
+ dmi_walk(ghes_edac_dmidecode, &dimm_fill);
rc = ghes_mc_add_or_free(mci, &dimm_fill.dimms);
if (rc < 0)
goto unlock;
+out:
/* only set on success */
refcount_set(&ghes_refcount, 1);
The code in ghes_edac_register() switches back and forth between standard and fake controller creation. Do one thing only and separate the code path that creates the fake MC. Note: For better review the code is not yet carved out in separate functions. Signed-off-by: Robert Richter <rrichter@marvell.com> --- drivers/edac/ghes_edac.c | 68 +++++++++++++++++++++++++--------------- 1 file changed, 42 insertions(+), 26 deletions(-)