EDAC, AMD: decode bus unit MCEs

... according to Table 69, Fam10h BKDG (31116, rev. 3.28).

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/drivers/edac/edac_mce_amd.c b/drivers/edac/edac_mce_amd.c
index b30a8306b143..e1f32c36248d 100644
--- a/drivers/edac/edac_mce_amd.c
+++ b/drivers/edac/edac_mce_amd.c
@@ -228,6 +228,48 @@ wrong_ic_mce:
         pr_warning("Corrupted IC MCE info?\n");
 }
 
+static void amd_decode_bu_mce(u64 mc2_status)
+{
+        u32 ec = mc2_status & 0xffff;
+        u32 xec = (mc2_status >> 16) & 0xf;
+
+        pr_emerg(" Bus Unit Error");
+
+        if (xec == 0x1)
+                pr_cont(" in the write data buffers.\n");
+        else if (xec == 0x3)
+                pr_cont(" in the victim data buffers.\n");
+        else if (xec == 0x2 && MEM_ERROR(ec))
+                pr_cont(": %s error in the L2 cache tags.\n", RRRR_MSG(ec));
+        else if (xec == 0x0) {
+                if (TLB_ERROR(ec))
+                        pr_cont(": %s error in a Page Descriptor Cache or "
+                                "Guest TLB.\n", TT_MSG(ec));
+                else if (BUS_ERROR(ec))
+                        pr_cont(": %s/ECC error in data read from NB: %s.\n",
+                                RRRR_MSG(ec), PP_MSG(ec));
+                else if (MEM_ERROR(ec)) {
+                        u8 rrrr = (ec >> 4) & 0xf;
+
+                        if (rrrr >= 0x7)
+                                pr_cont(": %s error during data copyback.\n",
+                                        RRRR_MSG(ec));
+                        else if (rrrr <= 0x1)
+                                pr_cont(": %s parity/ECC error during data "
+                                        "access from L2.\n", RRRR_MSG(ec));
+                        else
+                                goto wrong_bu_mce;
+                } else
+                        goto wrong_bu_mce;
+        } else
+                goto wrong_bu_mce;
+
+        return;
+
+wrong_bu_mce:
+        pr_warning("Corrupted BU MCE info?\n");
+}
+
 void amd_decode_nb_mce(int node_id, struct err_regs *regs, int handle_errors)
 {
         u32 ec  = ERROR_CODE(regs->nbsl);
@@ -320,6 +362,10 @@ void decode_mce(struct mce *m)
                 amd_decode_ic_mce(m->status);
                 break;
 
+        case 2:
+                amd_decode_bu_mce(m->status);
+                break;
+
         case 4:
                 regs.nbsl  = (u32) m->status;
                 regs.nbsh  = (u32)(m->status >> 32);