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linux-stable/drivers/edac/edac_mce_amd.c
Borislav Petkov 37b7370a8d amd64_edac: Do not report error overflow as a separate error 
When the Overflow MCi_STATUS bit is set, EDAC reports the lost error
with a "no information available" message which often puzzles users
parsing the dmesg. This doesn't make much sense since this error has
been lost anyway so no need for reporting it separately. Thus, report
the overflow bit setting in the MCE dump instead. While at it, remove
reporting of MiscV and ErrorEnable (en) which are superfluous.

Now it looks like this:

[ 1501.650024] MC4_STATUS: Corrected error, other errors lost: yes, CPU context corrupt: no, CECC Error
[ 1501.666887] Northbridge Error, node 2

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
2010-08-26 12:46:03 +02:00

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#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);
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);
if (!handle_errors)
return;
/*
* GART TLB error reporting is disabled by default. Bail out early.
*/
if (TLB_ERROR(ec) && !report_gart_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 > 7)) {
if (regs->nbsh & K8_NBSH_ERR_CPU_VAL)
pr_cont(", core: %u\n", (u8)(regs->nbsh & 0xf));
} else {
u8 assoc_cpus = regs->nbsh & 0xf;
if (assoc_cpus > 0)
pr_cont(", core: %d", fls(assoc_cpus) - 1);
pr_cont("\n");
}
pr_emerg("%s.\n", EXT_ERR_MSG(regs->nbsl));
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)) {
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 int amd_decode_mce(struct notifier_block *nb, unsigned long val,
void *data)
{
struct mce *m = (struct mce *)data;
struct err_regs regs;
int node, ecc;
pr_emerg("MC%d_STATUS: ", m->bank);
pr_cont("%sorrected error, other errors lost: %s, "
"CPU context corrupt: %s",
((m->status & MCI_STATUS_UC) ? "Unc" : "C"),
((m->status & MCI_STATUS_OVER) ? "yes" : "no"),
((m->status & MCI_STATUS_PCC) ? "yes" : "no"));
/* do the two bits[14:13] together */
ecc = (m->status >> 45) & 0x3;
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);
return NOTIFY_STOP;
}
static struct notifier_block amd_mce_dec_nb = {
.notifier_call = amd_decode_mce,
};
static int __init mce_amd_init(void)
{
/*
* We can decode MCEs for K8, F10h and F11h CPUs:
*/
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return 0;
if (boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x11)
return 0;
atomic_notifier_chain_register(&x86_mce_decoder_chain, &amd_mce_dec_nb);
return 0;
}
early_initcall(mce_amd_init);
#ifdef MODULE
static void __exit mce_amd_exit(void)
{
atomic_notifier_chain_unregister(&x86_mce_decoder_chain, &amd_mce_dec_nb);
}
MODULE_DESCRIPTION("AMD MCE decoder");
MODULE_ALIAS("edac-mce-amd");
MODULE_LICENSE("GPL");
module_exit(mce_amd_exit);
#endif
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