Commit 51966241 authored by Borislav Petkov's avatar Borislav Petkov
Browse files

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: default avatarBorislav Petkov <borislav.petkov@amd.com>
parent d93cc222

drivers/edac/edac_mce_amd.c

+54 −2
Original line number Diff line number Diff line
@@ -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);

}