EDAC/amd64: Recognize DRAM device type ECC capability

AMD Family 17h systems support x4 and x16 DRAM devices. However, the
device type is not checked when setting mci.edac_ctl_cap.

Set the appropriate capability flag based on the device type.

Default to x8 DRAM device when neither the x4 or x16 bits are set.

 [ bp: reverse cpk_en check to save an indentation level. ]

Fixes: 2d09d8f301f5 ("EDAC, amd64: Determine EDAC MC capabilities on Fam17h")
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20190821235938.118710-3-Yazen.Ghannam@amd.com

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index dd60cf5..ffe56a8 100644 (file)
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3150,12 +3150,15 @@ static bool ecc_enabled(struct pci_dev *F3, u16 nid)
 static inline void
 f17h_determine_edac_ctl_cap(struct mem_ctl_info *mci, struct amd64_pvt *pvt)
 {
-       u8 i, ecc_en = 1, cpk_en = 1;
+       u8 i, ecc_en = 1, cpk_en = 1, dev_x4 = 1, dev_x16 = 1;
 
        for_each_umc(i) {
                if (pvt->umc[i].sdp_ctrl & UMC_SDP_INIT) {
                        ecc_en &= !!(pvt->umc[i].umc_cap_hi & UMC_ECC_ENABLED);
                        cpk_en &= !!(pvt->umc[i].umc_cap_hi & UMC_ECC_CHIPKILL_CAP);
+
+                       dev_x4  &= !!(pvt->umc[i].dimm_cfg & BIT(6));
+                       dev_x16 &= !!(pvt->umc[i].dimm_cfg & BIT(7));
                }
        }
 
@@ -3163,8 +3166,15 @@ f17h_determine_edac_ctl_cap(struct mem_ctl_info *mci, struct amd64_pvt *pvt)
        if (ecc_en) {
                mci->edac_ctl_cap |= EDAC_FLAG_SECDED;
 
-               if (cpk_en)
+               if (!cpk_en)
+                       return;
+
+               if (dev_x4)
                        mci->edac_ctl_cap |= EDAC_FLAG_S4ECD4ED;
+               else if (dev_x16)
+                       mci->edac_ctl_cap |= EDAC_FLAG_S16ECD16ED;
+               else
+                       mci->edac_ctl_cap |= EDAC_FLAG_S8ECD8ED;
        }
 }