EDAC, AMD: decode data cache MCEs

Those get reported in MC0_STATUS, see Table 92, F10h BKDG (31116, rev.
3.28) for more details.

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

diff --git a/drivers/edac/edac_mce_amd.c b/drivers/edac/edac_mce_amd.c
index 81f812e..fe8cceb 100644 (file)
--- a/drivers/edac/edac_mce_amd.c
+++ b/drivers/edac/edac_mce_amd.c
@@ -128,6 +128,49 @@ const char *ext_msgs[] = {
 };
 EXPORT_SYMBOL_GPL(ext_msgs);
 
+static void amd_decode_dc_mce(u64 mc0_status)
+{
+       u32 ec  = mc0_status & 0xffff;
+       u32 xec = (mc0_status >> 16) & 0xf;
+
+       pr_emerg(" Data Cache Error");
+
+       if (xec == 1 && TLB_ERROR(ec))
+               pr_cont(": %s TLB multimatch.\n", LL_MSG(ec));
+       else if (xec == 0) {
+               if (mc0_status & (1ULL << 40))
+                       pr_cont(" during Data Scrub.\n");
+               else if (TLB_ERROR(ec))
+                       pr_cont(": %s TLB parity error.\n", LL_MSG(ec));
+               else if (MEM_ERROR(ec)) {
+                       u8 ll   = ec & 0x3;
+                       u8 tt   = (ec >> 2) & 0x3;
+                       u8 rrrr = (ec >> 4) & 0xf;
+
+                       /* see F10h BKDG (31116), Table 92. */
+                       if (ll == 0x1) {
+                               if (tt != 0x1)
+                                       goto wrong_dc_mce;
+
+                               pr_cont(": Data/Tag %s error.\n", RRRR_MSG(ec));
+
+                       } else if (ll == 0x2 && rrrr == 0x3)
+                               pr_cont(" during L1 linefill from L2.\n");
+                       else
+                               goto wrong_dc_mce;
+               } else if (BUS_ERROR(ec) && boot_cpu_data.x86 == 0xf)
+                       pr_cont(" during system linefill.\n");
+               else
+                       goto wrong_dc_mce;
+       } else
+               goto wrong_dc_mce;
+
+       return;
+
+wrong_dc_mce:
+       pr_warning("Corrupted DC MCE info?\n");
+}
+
 void amd_decode_nb_mce(int node_id, struct err_regs *regs, int handle_errors)
 {
        u32 ec  = ERROR_CODE(regs->nbsl);
@@ -211,9 +254,12 @@ void decode_mce(struct mce *m)
 
        pr_cont("\n");
 
-       amd_decode_err_code(m->status & 0xffff);
+       switch (m->bank) {
+       case 0:
+               amd_decode_dc_mce(m->status);
+               break;
 
-       if (m->bank == 4) {
+       case 4:
                regs.nbsl  = (u32) m->status;
                regs.nbsh  = (u32)(m->status >> 32);
                regs.nbeal = (u32) m->addr;
@@ -221,5 +267,11 @@ void decode_mce(struct mce *m)
                node       = per_cpu(cpu_llc_id, m->extcpu);
 
                amd_decode_nb_mce(node, &regs, 1);
+               break;
+
+       default:
+               break;
        }
+
+       amd_decode_err_code(m->status & 0xffff);
 }