drivers/edac/edac_mce_amd.c - kernel/msm - Gitiles

 #include <linux/module.h>
 #include "edac_mce_amd.h"

 static bool report_gart_errors;
 static void (*nb_bus_decoder)(int node_id, struct err_regs *regs);
 static void (*orig_mce_callback)(struct mce *m);

 void amd_report_gart_errors(bool v)
 {
 	report_gart_errors = v;
 }
 EXPORT_SYMBOL_GPL(amd_report_gart_errors);

 void amd_register_ecc_decoder(void (*f)(int, struct err_regs *))
 {
 	nb_bus_decoder = f;
 }
 EXPORT_SYMBOL_GPL(amd_register_ecc_decoder);

 void amd_unregister_ecc_decoder(void (*f)(int, struct err_regs *))
 {
 	if (nb_bus_decoder) {
 		WARN_ON(nb_bus_decoder != f);

 		nb_bus_decoder = NULL;
 	}
 }
 EXPORT_SYMBOL_GPL(amd_unregister_ecc_decoder);

 /*
  * string representation for the different MCA reported error types, see F3x48
  * or MSR0000_0411.
  */
 const char *tt_msgs[] = {        /* transaction type */
 	"instruction",
 	"data",
 	"generic",
 	"reserved"
 };
 EXPORT_SYMBOL_GPL(tt_msgs);

 const char *ll_msgs[] = {	/* cache level */
 	"L0",
 	"L1",
 	"L2",
 	"L3/generic"
 };
 EXPORT_SYMBOL_GPL(ll_msgs);

 const char *rrrr_msgs[] = {
 	"generic",
 	"generic read",
 	"generic write",
 	"data read",
 	"data write",
 	"inst fetch",
 	"prefetch",
 	"evict",
 	"snoop",
 	"reserved RRRR= 9",
 	"reserved RRRR= 10",
 	"reserved RRRR= 11",
 	"reserved RRRR= 12",
 	"reserved RRRR= 13",
 	"reserved RRRR= 14",
 	"reserved RRRR= 15"
 };
 EXPORT_SYMBOL_GPL(rrrr_msgs);

 const char *pp_msgs[] = {	/* participating processor */
 	"local node originated (SRC)",
 	"local node responded to request (RES)",
 	"local node observed as 3rd party (OBS)",
 	"generic"
 };
 EXPORT_SYMBOL_GPL(pp_msgs);

 const char *to_msgs[] = {
 	"no timeout",
 	"timed out"
 };
 EXPORT_SYMBOL_GPL(to_msgs);

 const char *ii_msgs[] = {	/* memory or i/o */
 	"mem access",
 	"reserved",
 	"i/o access",
 	"generic"
 };
 EXPORT_SYMBOL_GPL(ii_msgs);

 /*
  * Map the 4 or 5 (family-specific) bits of Extended Error code to the
  * string table.
  */
 const char *ext_msgs[] = {
 	"K8 ECC error",					/* 0_0000b */
 	"CRC error on link",				/* 0_0001b */
 	"Sync error packets on link",			/* 0_0010b */
 	"Master Abort during link operation",		/* 0_0011b */
 	"Target Abort during link operation",		/* 0_0100b */
 	"Invalid GART PTE entry during table walk",	/* 0_0101b */
 	"Unsupported atomic RMW command received",	/* 0_0110b */
 	"WDT error: NB transaction timeout",		/* 0_0111b */
 	"ECC/ChipKill ECC error",			/* 0_1000b */
 	"SVM DEV Error",				/* 0_1001b */
 	"Link Data error",				/* 0_1010b */
 	"Link/L3/Probe Filter Protocol error",		/* 0_1011b */
 	"NB Internal Arrays Parity error",		/* 0_1100b */
 	"DRAM Address/Control Parity error",		/* 0_1101b */
 	"Link Transmission error",			/* 0_1110b */
 	"GART/DEV Table Walk Data error"		/* 0_1111b */
 	"Res 0x100 error",				/* 1_0000b */
 	"Res 0x101 error",				/* 1_0001b */
 	"Res 0x102 error",				/* 1_0010b */
 	"Res 0x103 error",				/* 1_0011b */
 	"Res 0x104 error",				/* 1_0100b */
 	"Res 0x105 error",				/* 1_0101b */
 	"Res 0x106 error",				/* 1_0110b */
 	"Res 0x107 error",				/* 1_0111b */
 	"Res 0x108 error",				/* 1_1000b */
 	"Res 0x109 error",				/* 1_1001b */
 	"Res 0x10A error",				/* 1_1010b */
 	"Res 0x10B error",				/* 1_1011b */
 	"ECC error in L3 Cache Data",			/* 1_1100b */
 	"L3 Cache Tag error",				/* 1_1101b */
 	"L3 Cache LRU Parity error",			/* 1_1110b */
 	"Probe Filter error"				/* 1_1111b */
 };
 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");
 }

 static void amd_decode_ic_mce(u64 mc1_status)
 {
 	u32 ec  = mc1_status & 0xffff;
 	u32 xec = (mc1_status >> 16) & 0xf;

 	pr_emerg(" Instruction Cache Error");

 	if (xec == 1 && TLB_ERROR(ec))
 		pr_cont(": %s TLB multimatch.\n", LL_MSG(ec));
 	else if (xec == 0) {
 		if (TLB_ERROR(ec))
 			pr_cont(": %s TLB Parity error.\n", LL_MSG(ec));
 		else if (BUS_ERROR(ec)) {
 			if (boot_cpu_data.x86 == 0xf &&
 			    (mc1_status & (1ULL << 58)))
 				pr_cont(" during system linefill.\n");
 			else
 				pr_cont(" during attempted NB data read.\n");
 		} else if (MEM_ERROR(ec)) {
 			u8 ll   = ec & 0x3;
 			u8 rrrr = (ec >> 4) & 0xf;

 			if (ll == 0x2)
 				pr_cont(" during a linefill from L2.\n");
 			else if (ll == 0x1) {

 				switch (rrrr) {
 				case 0x5:
 					pr_cont(": Parity error during "
 					       "data load.\n");
 					break;

 				case 0x7:
 					pr_cont(": Copyback Parity/Victim"
 						" error.\n");
 					break;

 				case 0x8:
 					pr_cont(": Tag Snoop error.\n");
 					break;

 				default:
 					goto wrong_ic_mce;
 					break;
 				}
 			}
 		} else
 			goto wrong_ic_mce;
 	} else
 		goto wrong_ic_mce;

 	return;

 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");
 }

 static void amd_decode_ls_mce(u64 mc3_status)
 {
 	u32 ec  = mc3_status & 0xffff;
 	u32 xec = (mc3_status >> 16) & 0xf;

 	pr_emerg(" Load Store Error");

 	if (xec == 0x0) {
 		u8 rrrr = (ec >> 4) & 0xf;

 		if (!BUS_ERROR(ec) || (rrrr != 0x3 && rrrr != 0x4))
 			goto wrong_ls_mce;

 		pr_cont(" during %s.\n", RRRR_MSG(ec));
 	}
 	return;

 wrong_ls_mce:
 	pr_warning("Corrupted LS MCE info?\n");
 }

 void amd_decode_nb_mce(int node_id, struct err_regs *regs, int handle_errors)
 {
 	u32 ec  = ERROR_CODE(regs->nbsl);
 	u32 xec = EXT_ERROR_CODE(regs->nbsl);

 	if (!handle_errors)
 		return;

 	pr_emerg(" Northbridge Error, node %d", node_id);

 	/*
 	 * F10h, revD can disable ErrCpu[3:0] so check that first and also the
 	 * value encoding has changed so interpret those differently
 	 */
 	if ((boot_cpu_data.x86 == 0x10) &&
 	    (boot_cpu_data.x86_model > 8)) {
 		if (regs->nbsh & K8_NBSH_ERR_CPU_VAL)
 			pr_cont(", core: %u\n", (u8)(regs->nbsh & 0xf));
 	} else {
 		pr_cont(", core: %d\n", ilog2((regs->nbsh & 0xf)));
 	}


 	pr_emerg("%s.\n", EXT_ERR_MSG(xec));

 	if (BUS_ERROR(ec) && nb_bus_decoder)
 		nb_bus_decoder(node_id, regs);
 }
 EXPORT_SYMBOL_GPL(amd_decode_nb_mce);

 static void amd_decode_fr_mce(u64 mc5_status)
 {
 	/* we have only one error signature so match all fields at once. */
 	if ((mc5_status & 0xffff) == 0x0f0f)
 		pr_emerg(" FR Error: CPU Watchdog timer expire.\n");
 	else
 		pr_warning("Corrupted FR MCE info?\n");
 }

 static inline void amd_decode_err_code(unsigned int ec)
 {
 	if (TLB_ERROR(ec)) {
 		/*
 		 * GART errors are intended to help graphics driver developers
 		 * to detect bad GART PTEs. It is recommended by AMD to disable
 		 * GART table walk error reporting by default[1] (currently
 		 * being disabled in mce_cpu_quirks()) and according to the
 		 * comment in mce_cpu_quirks(), such GART errors can be
 		 * incorrectly triggered. We may see these errors anyway and
 		 * unless requested by the user, they won't be reported.
 		 *
 		 * [1] section 13.10.1 on BIOS and Kernel Developers Guide for
 		 *     AMD NPT family 0Fh processors
 		 */
 		if (!report_gart_errors)
 			return;

 		pr_emerg(" Transaction: %s, Cache Level %s\n",
 			 TT_MSG(ec), LL_MSG(ec));
 	} else if (MEM_ERROR(ec)) {
 		pr_emerg(" Transaction: %s, Type: %s, Cache Level: %s",
 			 RRRR_MSG(ec), TT_MSG(ec), LL_MSG(ec));
 	} else if (BUS_ERROR(ec)) {
 		pr_emerg(" Transaction type: %s(%s), %s, Cache Level: %s, "
 			 "Participating Processor: %s\n",
 			  RRRR_MSG(ec), II_MSG(ec), TO_MSG(ec), LL_MSG(ec),
 			  PP_MSG(ec));
 	} else
 		pr_warning("Huh? Unknown MCE error 0x%x\n", ec);
 }

 static void amd_decode_mce(struct mce *m)
 {
 	struct err_regs regs;
 	int node, ecc;

 	pr_emerg("MC%d_STATUS: ", m->bank);

 	pr_cont("%sorrected error, report: %s, MiscV: %svalid, "
 		 "CPU context corrupt: %s",
 		 ((m->status & MCI_STATUS_UC) ? "Unc"  : "C"),
 		 ((m->status & MCI_STATUS_EN) ? "yes"  : "no"),
 		 ((m->status & MCI_STATUS_MISCV) ? ""  : "in"),
 		 ((m->status & MCI_STATUS_PCC) ? "yes" : "no"));

 	/* do the two bits[14:13] together */
 	ecc = m->status & (3ULL << 45);
 	if (ecc)
 		pr_cont(", %sECC Error", ((ecc == 2) ? "C" : "U"));

 	pr_cont("\n");

 	switch (m->bank) {
 	case 0:
 		amd_decode_dc_mce(m->status);
 		break;

 	case 1:
 		amd_decode_ic_mce(m->status);
 		break;

 	case 2:
 		amd_decode_bu_mce(m->status);
 		break;

 	case 3:
 		amd_decode_ls_mce(m->status);
 		break;

 	case 4:
 		regs.nbsl  = (u32) m->status;
 		regs.nbsh  = (u32)(m->status >> 32);
 		regs.nbeal = (u32) m->addr;
 		regs.nbeah = (u32)(m->addr >> 32);
 		node       = amd_get_nb_id(m->extcpu);

 		amd_decode_nb_mce(node, &regs, 1);
 		break;

 	case 5:
 		amd_decode_fr_mce(m->status);
 		break;

 	default:
 		break;
 	}

 	amd_decode_err_code(m->status & 0xffff);
 }

 static int __init mce_amd_init(void)
 {
 	/*
 	 * We can decode MCEs for Opteron and later CPUs:
 	 */
 	if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
 	    (boot_cpu_data.x86 >= 0xf)) {
 		/* safe the default decode mce callback */
 		orig_mce_callback = x86_mce_decode_callback;

 		x86_mce_decode_callback = amd_decode_mce;
 	}

 	return 0;
 }
 early_initcall(mce_amd_init);

 #ifdef MODULE
 static void __exit mce_amd_exit(void)
 {
 	x86_mce_decode_callback = orig_mce_callback;
 }

 MODULE_DESCRIPTION("AMD MCE decoder");
 MODULE_ALIAS("edac-mce-amd");
 MODULE_LICENSE("GPL");
 module_exit(mce_amd_exit);
 #endif
	#include <linux/module.h>
	#include "edac_mce_amd.h"

	static bool report_gart_errors;
	static void (nb_bus_decoder)(int node_id, struct err_regs regs);
	static void (orig_mce_callback)(struct mce m);

	void amd_report_gart_errors(bool v)
	{
	report_gart_errors = v;
	}
	EXPORT_SYMBOL_GPL(amd_report_gart_errors);

	void amd_register_ecc_decoder(void (f)(int, struct err_regs ))
	{
	nb_bus_decoder = f;
	}
	EXPORT_SYMBOL_GPL(amd_register_ecc_decoder);

	void amd_unregister_ecc_decoder(void (f)(int, struct err_regs ))
	{
	if (nb_bus_decoder) {
	WARN_ON(nb_bus_decoder != f);

	nb_bus_decoder = NULL;
	}
	}
	EXPORT_SYMBOL_GPL(amd_unregister_ecc_decoder);

	/*
	* string representation for the different MCA reported error types, see F3x48
	* or MSR0000_0411.
	*/
	const char tt_msgs[] = { / transaction type */
	"instruction",
	"data",
	"generic",
	"reserved"
	};
	EXPORT_SYMBOL_GPL(tt_msgs);

	const char ll_msgs[] = { / cache level */
	"L0",
	"L1",
	"L2",
	"L3/generic"
	};
	EXPORT_SYMBOL_GPL(ll_msgs);

	const char *rrrr_msgs[] = {
	"generic",
	"generic read",
	"generic write",
	"data read",
	"data write",
	"inst fetch",
	"prefetch",
	"evict",
	"snoop",
	"reserved RRRR= 9",
	"reserved RRRR= 10",
	"reserved RRRR= 11",
	"reserved RRRR= 12",
	"reserved RRRR= 13",
	"reserved RRRR= 14",
	"reserved RRRR= 15"
	};
	EXPORT_SYMBOL_GPL(rrrr_msgs);

	const char pp_msgs[] = { / participating processor */
	"local node originated (SRC)",
	"local node responded to request (RES)",
	"local node observed as 3rd party (OBS)",
	"generic"
	};
	EXPORT_SYMBOL_GPL(pp_msgs);

	const char *to_msgs[] = {
	"no timeout",
	"timed out"
	};
	EXPORT_SYMBOL_GPL(to_msgs);

	const char ii_msgs[] = { / memory or i/o */
	"mem access",
	"reserved",
	"i/o access",
	"generic"
	};
	EXPORT_SYMBOL_GPL(ii_msgs);

	/*
	* Map the 4 or 5 (family-specific) bits of Extended Error code to the
	* string table.
	*/
	const char *ext_msgs[] = {
	"K8 ECC error", /* 0_0000b */
	"CRC error on link", /* 0_0001b */
	"Sync error packets on link", /* 0_0010b */
	"Master Abort during link operation", /* 0_0011b */
	"Target Abort during link operation", /* 0_0100b */
	"Invalid GART PTE entry during table walk", /* 0_0101b */
	"Unsupported atomic RMW command received", /* 0_0110b */
	"WDT error: NB transaction timeout", /* 0_0111b */
	"ECC/ChipKill ECC error", /* 0_1000b */
	"SVM DEV Error", /* 0_1001b */
	"Link Data error", /* 0_1010b */
	"Link/L3/Probe Filter Protocol error", /* 0_1011b */
	"NB Internal Arrays Parity error", /* 0_1100b */
	"DRAM Address/Control Parity error", /* 0_1101b */
	"Link Transmission error", /* 0_1110b */
	"GART/DEV Table Walk Data error" /* 0_1111b */
	"Res 0x100 error", /* 1_0000b */
	"Res 0x101 error", /* 1_0001b */
	"Res 0x102 error", /* 1_0010b */
	"Res 0x103 error", /* 1_0011b */
	"Res 0x104 error", /* 1_0100b */
	"Res 0x105 error", /* 1_0101b */
	"Res 0x106 error", /* 1_0110b */
	"Res 0x107 error", /* 1_0111b */
	"Res 0x108 error", /* 1_1000b */
	"Res 0x109 error", /* 1_1001b */
	"Res 0x10A error", /* 1_1010b */
	"Res 0x10B error", /* 1_1011b */
	"ECC error in L3 Cache Data", /* 1_1100b */
	"L3 Cache Tag error", /* 1_1101b */
	"L3 Cache LRU Parity error", /* 1_1110b */
	"Probe Filter error" /* 1_1111b */
	};
	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");
	}

	static void amd_decode_ic_mce(u64 mc1_status)
	{
	u32 ec = mc1_status & 0xffff;
	u32 xec = (mc1_status >> 16) & 0xf;

	pr_emerg(" Instruction Cache Error");

	if (xec == 1 && TLB_ERROR(ec))
	pr_cont(": %s TLB multimatch.\n", LL_MSG(ec));
	else if (xec == 0) {
	if (TLB_ERROR(ec))
	pr_cont(": %s TLB Parity error.\n", LL_MSG(ec));
	else if (BUS_ERROR(ec)) {
	if (boot_cpu_data.x86 == 0xf &&
	(mc1_status & (1ULL << 58)))
	pr_cont(" during system linefill.\n");
	else
	pr_cont(" during attempted NB data read.\n");
	} else if (MEM_ERROR(ec)) {
	u8 ll = ec & 0x3;
	u8 rrrr = (ec >> 4) & 0xf;

	if (ll == 0x2)
	pr_cont(" during a linefill from L2.\n");
	else if (ll == 0x1) {

	switch (rrrr) {
	case 0x5:
	pr_cont(": Parity error during "
	"data load.\n");
	break;

	case 0x7:
	pr_cont(": Copyback Parity/Victim"
	" error.\n");
	break;

	case 0x8:
	pr_cont(": Tag Snoop error.\n");
	break;

	default:
	goto wrong_ic_mce;
	break;
	}
	}
	} else
	goto wrong_ic_mce;
	} else
	goto wrong_ic_mce;

	return;

	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");
	}

	static void amd_decode_ls_mce(u64 mc3_status)
	{
	u32 ec = mc3_status & 0xffff;
	u32 xec = (mc3_status >> 16) & 0xf;

	pr_emerg(" Load Store Error");

	if (xec == 0x0) {
	u8 rrrr = (ec >> 4) & 0xf;

	if (!BUS_ERROR(ec) \|\| (rrrr != 0x3 && rrrr != 0x4))
	goto wrong_ls_mce;

	pr_cont(" during %s.\n", RRRR_MSG(ec));
	}
	return;

	wrong_ls_mce:
	pr_warning("Corrupted LS MCE info?\n");
	}

	void amd_decode_nb_mce(int node_id, struct err_regs *regs, int handle_errors)
	{
	u32 ec = ERROR_CODE(regs->nbsl);
	u32 xec = EXT_ERROR_CODE(regs->nbsl);

	if (!handle_errors)
	return;

	pr_emerg(" Northbridge Error, node %d", node_id);

	/*
	* F10h, revD can disable ErrCpu[3:0] so check that first and also the
	* value encoding has changed so interpret those differently
	*/
	if ((boot_cpu_data.x86 == 0x10) &&
	(boot_cpu_data.x86_model > 8)) {
	if (regs->nbsh & K8_NBSH_ERR_CPU_VAL)
	pr_cont(", core: %u\n", (u8)(regs->nbsh & 0xf));
	} else {
	pr_cont(", core: %d\n", ilog2((regs->nbsh & 0xf)));
	}


	pr_emerg("%s.\n", EXT_ERR_MSG(xec));

	if (BUS_ERROR(ec) && nb_bus_decoder)
	nb_bus_decoder(node_id, regs);
	}
	EXPORT_SYMBOL_GPL(amd_decode_nb_mce);

	static void amd_decode_fr_mce(u64 mc5_status)
	{
	/* we have only one error signature so match all fields at once. */
	if ((mc5_status & 0xffff) == 0x0f0f)
	pr_emerg(" FR Error: CPU Watchdog timer expire.\n");
	else
	pr_warning("Corrupted FR MCE info?\n");
	}

	static inline void amd_decode_err_code(unsigned int ec)
	{
	if (TLB_ERROR(ec)) {
	/*
	* GART errors are intended to help graphics driver developers
	* to detect bad GART PTEs. It is recommended by AMD to disable
	* GART table walk error reporting by default[1] (currently
	* being disabled in mce_cpu_quirks()) and according to the
	* comment in mce_cpu_quirks(), such GART errors can be
	* incorrectly triggered. We may see these errors anyway and
	* unless requested by the user, they won't be reported.
	*
	* [1] section 13.10.1 on BIOS and Kernel Developers Guide for
	* AMD NPT family 0Fh processors
	*/
	if (!report_gart_errors)
	return;

	pr_emerg(" Transaction: %s, Cache Level %s\n",
	TT_MSG(ec), LL_MSG(ec));
	} else if (MEM_ERROR(ec)) {
	pr_emerg(" Transaction: %s, Type: %s, Cache Level: %s",
	RRRR_MSG(ec), TT_MSG(ec), LL_MSG(ec));
	} else if (BUS_ERROR(ec)) {
	pr_emerg(" Transaction type: %s(%s), %s, Cache Level: %s, "
	"Participating Processor: %s\n",
	RRRR_MSG(ec), II_MSG(ec), TO_MSG(ec), LL_MSG(ec),
	PP_MSG(ec));
	} else
	pr_warning("Huh? Unknown MCE error 0x%x\n", ec);
	}

	static void amd_decode_mce(struct mce *m)
	{
	struct err_regs regs;
	int node, ecc;

	pr_emerg("MC%d_STATUS: ", m->bank);

	pr_cont("%sorrected error, report: %s, MiscV: %svalid, "
	"CPU context corrupt: %s",
	((m->status & MCI_STATUS_UC) ? "Unc" : "C"),
	((m->status & MCI_STATUS_EN) ? "yes" : "no"),
	((m->status & MCI_STATUS_MISCV) ? "" : "in"),
	((m->status & MCI_STATUS_PCC) ? "yes" : "no"));

	/* do the two bits[14:13] together */
	ecc = m->status & (3ULL << 45);
	if (ecc)
	pr_cont(", %sECC Error", ((ecc == 2) ? "C" : "U"));

	pr_cont("\n");

	switch (m->bank) {
	case 0:
	amd_decode_dc_mce(m->status);
	break;

	case 1:
	amd_decode_ic_mce(m->status);
	break;

	case 2:
	amd_decode_bu_mce(m->status);
	break;

	case 3:
	amd_decode_ls_mce(m->status);
	break;

	case 4:
	regs.nbsl = (u32) m->status;
	regs.nbsh = (u32)(m->status >> 32);
	regs.nbeal = (u32) m->addr;
	regs.nbeah = (u32)(m->addr >> 32);
	node = amd_get_nb_id(m->extcpu);

	amd_decode_nb_mce(node, &regs, 1);
	break;

	case 5:
	amd_decode_fr_mce(m->status);
	break;

	default:
	break;
	}

	amd_decode_err_code(m->status & 0xffff);
	}

	static int __init mce_amd_init(void)
	{
	/*
	* We can decode MCEs for Opteron and later CPUs:
	*/
	if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
	(boot_cpu_data.x86 >= 0xf)) {
	/* safe the default decode mce callback */
	orig_mce_callback = x86_mce_decode_callback;

	x86_mce_decode_callback = amd_decode_mce;
	}

	return 0;
	}
	early_initcall(mce_amd_init);

	#ifdef MODULE
	static void __exit mce_amd_exit(void)
	{
	x86_mce_decode_callback = orig_mce_callback;
	}

	MODULE_DESCRIPTION("AMD MCE decoder");
	MODULE_ALIAS("edac-mce-amd");
	MODULE_LICENSE("GPL");
	module_exit(mce_amd_exit);
	#endif