edac: sb_edac.c should not require prescence of IMC_DDRIO device
The Sandy Bridge EDAC driver uses a register in the IMC_DDRIO CSR
space to determine the type of DIMMs (registered or unregistered).
But this device does not exist on some single socket Sandy Bridge
servers. While the type of DIMMs is nice to know, it is not essential
for this driver's other functions. So it seems harsh to have it
refuse to load at all when it cannot find this device.
Make the check for this device be optional. If it isn't present
just report the memory type as "MEM_UNKNOWN".
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 57244f9..e04462b 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -331,30 +331,31 @@
u64 tolm, tohm;
};
-#define PCI_DESCR(device, function, device_id) \
- .dev = (device), \
- .func = (function), \
- .dev_id = (device_id)
+#define PCI_DESCR(device, function, device_id, opt) \
+ .dev = (device), \
+ .func = (function), \
+ .dev_id = (device_id), \
+ .optional = opt
static const struct pci_id_descr pci_dev_descr_sbridge[] = {
/* Processor Home Agent */
- { PCI_DESCR(14, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0) },
+ { PCI_DESCR(14, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0, 0) },
/* Memory controller */
- { PCI_DESCR(15, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA) },
- { PCI_DESCR(15, 1, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS) },
- { PCI_DESCR(15, 2, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0) },
- { PCI_DESCR(15, 3, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1) },
- { PCI_DESCR(15, 4, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2) },
- { PCI_DESCR(15, 5, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3) },
- { PCI_DESCR(17, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO) },
+ { PCI_DESCR(15, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA, 0) },
+ { PCI_DESCR(15, 1, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_RAS, 0) },
+ { PCI_DESCR(15, 2, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0, 0) },
+ { PCI_DESCR(15, 3, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD1, 0) },
+ { PCI_DESCR(15, 4, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD2, 0) },
+ { PCI_DESCR(15, 5, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD3, 0) },
+ { PCI_DESCR(17, 0, PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO, 1) },
/* System Address Decoder */
- { PCI_DESCR(12, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0) },
- { PCI_DESCR(12, 7, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1) },
+ { PCI_DESCR(12, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD0, 0) },
+ { PCI_DESCR(12, 7, PCI_DEVICE_ID_INTEL_SBRIDGE_SAD1, 0) },
/* Broadcast Registers */
- { PCI_DESCR(13, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_BR) },
+ { PCI_DESCR(13, 6, PCI_DEVICE_ID_INTEL_SBRIDGE_BR, 0) },
};
#define PCI_ID_TABLE_ENTRY(A) { .descr=A, .n_devs = ARRAY_SIZE(A) }
@@ -556,14 +557,19 @@
pvt->is_close_pg = false;
}
- pci_read_config_dword(pvt->pci_ddrio, RANK_CFG_A, ®);
- if (IS_RDIMM_ENABLED(reg)) {
- /* FIXME: Can also be LRDIMM */
- edac_dbg(0, "Memory is registered\n");
- mtype = MEM_RDDR3;
+ if (pvt->pci_ddrio) {
+ pci_read_config_dword(pvt->pci_ddrio, RANK_CFG_A, ®);
+ if (IS_RDIMM_ENABLED(reg)) {
+ /* FIXME: Can also be LRDIMM */
+ edac_dbg(0, "Memory is registered\n");
+ mtype = MEM_RDDR3;
+ } else {
+ edac_dbg(0, "Memory is unregistered\n");
+ mtype = MEM_DDR3;
+ }
} else {
- edac_dbg(0, "Memory is unregistered\n");
- mtype = MEM_DDR3;
+ edac_dbg(0, "Cannot determine memory type\n");
+ mtype = MEM_UNKNOWN;
}
/* On all supported DDR3 DIMM types, there are 8 banks available */
@@ -1303,8 +1309,7 @@
/* Check if everything were registered */
if (!pvt->pci_sad0 || !pvt->pci_sad1 || !pvt->pci_ha0 ||
- !pvt-> pci_tad || !pvt->pci_ras || !pvt->pci_ta ||
- !pvt->pci_ddrio)
+ !pvt-> pci_tad || !pvt->pci_ras || !pvt->pci_ta)
goto enodev;
for (i = 0; i < NUM_CHANNELS; i++) {