linux/drivers/edac/mce_amd.c

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#include <linux/module.h>
#include <linux/slab.h>
#include "mce_amd.h"
static struct amd_decoder_ops *fam_ops;
static u8 nb_err_cpumask = 0xf;
static bool report_gart_errors;
static void (*nb_bus_decoder)(int node_id, struct mce *m, u32 nbcfg);
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 mce *, u32))
{
nb_bus_decoder = f;
}
EXPORT_SYMBOL_GPL(amd_register_ecc_decoder);
void amd_unregister_ecc_decoder(void (*f)(int, struct mce *, u32))
{
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.
*/
/* transaction type */
const char *tt_msgs[] = { "INSN", "DATA", "GEN", "RESV" };
EXPORT_SYMBOL_GPL(tt_msgs);
/* cache level */
const char *ll_msgs[] = { "RESV", "L1", "L2", "L3/GEN" };
EXPORT_SYMBOL_GPL(ll_msgs);
/* memory transaction type */
const char *rrrr_msgs[] = {
"GEN", "RD", "WR", "DRD", "DWR", "IRD", "PRF", "EV", "SNP"
};
EXPORT_SYMBOL_GPL(rrrr_msgs);
/* participating processor */
const char *pp_msgs[] = { "SRC", "RES", "OBS", "GEN" };
EXPORT_SYMBOL_GPL(pp_msgs);
/* request timeout */
const char *to_msgs[] = { "no timeout", "timed out" };
EXPORT_SYMBOL_GPL(to_msgs);
/* memory or i/o */
const char *ii_msgs[] = { "MEM", "RESV", "IO", "GEN" };
EXPORT_SYMBOL_GPL(ii_msgs);
static const char *f10h_nb_mce_desc[] = {
"HT link data error",
"Protocol error (link, L3, probe filter, etc.)",
"Parity error in NB-internal arrays",
"Link Retry due to IO link transmission error",
"L3 ECC data cache error",
"ECC error in L3 cache tag",
"L3 LRU parity bits error",
"ECC Error in the Probe Filter directory"
};
static bool f12h_dc_mce(u16 ec)
{
bool ret = false;
if (MEM_ERROR(ec)) {
u8 ll = ec & 0x3;
ret = true;
if (ll == LL_L2)
pr_cont("during L1 linefill from L2.\n");
else if (ll == LL_L1)
pr_cont("Data/Tag %s error.\n", RRRR_MSG(ec));
else
ret = false;
}
return ret;
}
static bool f10h_dc_mce(u16 ec)
{
u8 r4 = (ec >> 4) & 0xf;
u8 ll = ec & 0x3;
if (r4 == R4_GEN && ll == LL_L1) {
pr_cont("during data scrub.\n");
return true;
}
return f12h_dc_mce(ec);
}
static bool k8_dc_mce(u16 ec)
{
if (BUS_ERROR(ec)) {
pr_cont("during system linefill.\n");
return true;
}
return f10h_dc_mce(ec);
}
static bool f14h_dc_mce(u16 ec)
{
u8 r4 = (ec >> 4) & 0xf;
u8 ll = ec & 0x3;
u8 tt = (ec >> 2) & 0x3;
u8 ii = tt;
bool ret = true;
if (MEM_ERROR(ec)) {
if (tt != TT_DATA || ll != LL_L1)
return false;
switch (r4) {
case R4_DRD:
case R4_DWR:
pr_cont("Data/Tag parity error due to %s.\n",
(r4 == R4_DRD ? "load/hw prf" : "store"));
break;
case R4_EVICT:
pr_cont("Copyback parity error on a tag miss.\n");
break;
case R4_SNOOP:
pr_cont("Tag parity error during snoop.\n");
break;
default:
ret = false;
}
} else if (BUS_ERROR(ec)) {
if ((ii != II_MEM && ii != II_IO) || ll != LL_LG)
return false;
pr_cont("System read data error on a ");
switch (r4) {
case R4_RD:
pr_cont("TLB reload.\n");
break;
case R4_DWR:
pr_cont("store.\n");
break;
case R4_DRD:
pr_cont("load.\n");
break;
default:
ret = false;
}
} else {
ret = false;
}
return ret;
}
static void amd_decode_dc_mce(struct mce *m)
{
u16 ec = m->status & 0xffff;
u8 xec = (m->status >> 16) & 0xf;
pr_emerg(HW_ERR "Data Cache Error: ");
/* TLB error signatures are the same across families */
if (TLB_ERROR(ec)) {
u8 tt = (ec >> 2) & 0x3;
if (tt == TT_DATA) {
pr_cont("%s TLB %s.\n", LL_MSG(ec),
(xec ? "multimatch" : "parity error"));
return;
}
else
goto wrong_dc_mce;
}
if (!fam_ops->dc_mce(ec))
goto wrong_dc_mce;
return;
wrong_dc_mce:
pr_emerg(HW_ERR "Corrupted DC MCE info?\n");
}
static bool k8_ic_mce(u16 ec)
{
u8 ll = ec & 0x3;
u8 r4 = (ec >> 4) & 0xf;
bool ret = true;
if (!MEM_ERROR(ec))
return false;
if (ll == 0x2)
pr_cont("during a linefill from L2.\n");
else if (ll == 0x1) {
switch (r4) {
case R4_IRD:
pr_cont("Parity error during data load.\n");
break;
case R4_EVICT:
pr_cont("Copyback Parity/Victim error.\n");
break;
case R4_SNOOP:
pr_cont("Tag Snoop error.\n");
break;
default:
ret = false;
break;
}
} else
ret = false;
return ret;
}
static bool f14h_ic_mce(u16 ec)
{
u8 ll = ec & 0x3;
u8 tt = (ec >> 2) & 0x3;
u8 r4 = (ec >> 4) & 0xf;
bool ret = true;
if (MEM_ERROR(ec)) {
if (tt != 0 || ll != 1)
ret = false;
if (r4 == R4_IRD)
pr_cont("Data/tag array parity error for a tag hit.\n");
else if (r4 == R4_SNOOP)
pr_cont("Tag error during snoop/victimization.\n");
else
ret = false;
}
return ret;
}
static void amd_decode_ic_mce(struct mce *m)
{
u16 ec = m->status & 0xffff;
u8 xec = (m->status >> 16) & 0xf;
pr_emerg(HW_ERR "Instruction Cache Error: ");
if (TLB_ERROR(ec))
pr_cont("%s TLB %s.\n", LL_MSG(ec),
(xec ? "multimatch" : "parity error"));
else if (BUS_ERROR(ec)) {
bool k8 = (boot_cpu_data.x86 == 0xf && (m->status & BIT_64(58)));
pr_cont("during %s.\n", (k8 ? "system linefill" : "NB data read"));
} else if (fam_ops->ic_mce(ec))
;
else
pr_emerg(HW_ERR "Corrupted IC MCE info?\n");
}
static void amd_decode_bu_mce(struct mce *m)
{
u32 ec = m->status & 0xffff;
u32 xec = (m->status >> 16) & 0xf;
pr_emerg(HW_ERR "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_emerg(HW_ERR "Corrupted BU MCE info?\n");
}
static void amd_decode_ls_mce(struct mce *m)
{
u16 ec = m->status & 0xffff;
u8 xec = (m->status >> 16) & 0xf;
if (boot_cpu_data.x86 == 0x14) {
pr_emerg("You shouldn't be seeing an LS MCE on this cpu family,"
" please report on LKML.\n");
return;
}
pr_emerg(HW_ERR "Load Store Error");
if (xec == 0x0) {
u8 r4 = (ec >> 4) & 0xf;
if (!BUS_ERROR(ec) || (r4 != R4_DRD && r4 != R4_DWR))
goto wrong_ls_mce;
pr_cont(" during %s.\n", RRRR_MSG(ec));
} else
goto wrong_ls_mce;
return;
wrong_ls_mce:
pr_emerg(HW_ERR "Corrupted LS MCE info?\n");
}
static bool k8_nb_mce(u16 ec, u8 xec)
{
bool ret = true;
switch (xec) {
case 0x1:
pr_cont("CRC error detected on HT link.\n");
break;
case 0x5:
pr_cont("Invalid GART PTE entry during GART table walk.\n");
break;
case 0x6:
pr_cont("Unsupported atomic RMW received from an IO link.\n");
break;
case 0x0:
case 0x8:
if (boot_cpu_data.x86 == 0x11)
return false;
pr_cont("DRAM ECC error detected on the NB.\n");
break;
case 0xd:
pr_cont("Parity error on the DRAM addr/ctl signals.\n");
break;
default:
ret = false;
break;
}
return ret;
}
static bool f10h_nb_mce(u16 ec, u8 xec)
{
bool ret = true;
u8 offset = 0;
if (k8_nb_mce(ec, xec))
return true;
switch(xec) {
case 0xa ... 0xc:
offset = 10;
break;
case 0xe:
offset = 11;
break;
case 0xf:
if (TLB_ERROR(ec))
pr_cont("GART Table Walk data error.\n");
else if (BUS_ERROR(ec))
pr_cont("DMA Exclusion Vector Table Walk error.\n");
else
ret = false;
goto out;
break;
case 0x1c ... 0x1f:
offset = 24;
break;
default:
ret = false;
goto out;
break;
}
pr_cont("%s.\n", f10h_nb_mce_desc[xec - offset]);
out:
return ret;
}
static bool nb_noop_mce(u16 ec, u8 xec)
{
return false;
}
void amd_decode_nb_mce(int node_id, struct mce *m, u32 nbcfg)
{
u8 xec = (m->status >> 16) & 0x1f;
u16 ec = m->status & 0xffff;
u32 nbsh = (u32)(m->status >> 32);
pr_emerg(HW_ERR "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 (nbsh & K8_NBSH_ERR_CPU_VAL)
pr_cont(", core: %u", (u8)(nbsh & nb_err_cpumask));
} else {
u8 assoc_cpus = nbsh & nb_err_cpumask;
if (assoc_cpus > 0)
pr_cont(", core: %d", fls(assoc_cpus) - 1);
}
switch (xec) {
case 0x2:
pr_cont("Sync error (sync packets on HT link detected).\n");
return;
case 0x3:
pr_cont("HT Master abort.\n");
return;
case 0x4:
pr_cont("HT Target abort.\n");
return;
case 0x7:
pr_cont("NB Watchdog timeout.\n");
return;
case 0x9:
pr_cont("SVM DMA Exclusion Vector error.\n");
return;
default:
break;
}
if (!fam_ops->nb_mce(ec, xec))
goto wrong_nb_mce;
if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10)
if ((xec == 0x8 || xec == 0x0) && nb_bus_decoder)
nb_bus_decoder(node_id, m, nbcfg);
return;
wrong_nb_mce:
pr_emerg(HW_ERR "Corrupted NB MCE info?\n");
}
EXPORT_SYMBOL_GPL(amd_decode_nb_mce);
static void amd_decode_fr_mce(struct mce *m)
{
if (boot_cpu_data.x86 == 0xf ||
boot_cpu_data.x86 == 0x11)
goto wrong_fr_mce;
/* we have only one error signature so match all fields at once. */
if ((m->status & 0xffff) == 0x0f0f) {
pr_emerg(HW_ERR "FR Error: CPU Watchdog timer expire.\n");
return;
}
wrong_fr_mce:
pr_emerg(HW_ERR "Corrupted FR MCE info?\n");
}
static inline void amd_decode_err_code(u16 ec)
{
if (TLB_ERROR(ec)) {
pr_emerg(HW_ERR "Transaction: %s, Cache Level: %s\n",
TT_MSG(ec), LL_MSG(ec));
} else if (MEM_ERROR(ec)) {
pr_emerg(HW_ERR "Transaction: %s, Type: %s, Cache Level: %s\n",
RRRR_MSG(ec), TT_MSG(ec), LL_MSG(ec));
} else if (BUS_ERROR(ec)) {
pr_emerg(HW_ERR "Transaction: %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_emerg(HW_ERR "Huh? Unknown MCE error 0x%x\n", ec);
}
/*
* Filter out unwanted MCE signatures here.
*/
static bool amd_filter_mce(struct mce *m)
{
u8 xec = (m->status >> 16) & 0x1f;
/*
* NB GART TLB error reporting is disabled by default.
*/
if (m->bank == 4 && xec == 0x5 && !report_gart_errors)
return true;
return false;
}
int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
{
struct mce *m = (struct mce *)data;
int node, ecc;
if (amd_filter_mce(m))
return NOTIFY_STOP;
pr_emerg(HW_ERR "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);
break;
case 1:
amd_decode_ic_mce(m);
break;
case 2:
amd_decode_bu_mce(m);
break;
case 3:
amd_decode_ls_mce(m);
break;
case 4:
node = amd_get_nb_id(m->extcpu);
amd_decode_nb_mce(node, m, 0);
break;
case 5:
amd_decode_fr_mce(m);
break;
default:
break;
}
amd_decode_err_code(m->status & 0xffff);
return NOTIFY_STOP;
}
EXPORT_SYMBOL_GPL(amd_decode_mce);
x86: EDAC: MCE: Fix MCE decoding callback logic Make decoding of MCEs happen only on AMD hardware by registering a non-default callback only on CPU families which support it. While looking at the interaction of decode_mce() with the other MCE code i also noticed a few other things and made the following cleanups/fixes: - Fixed the mce_decode() weak alias - a weak alias is really not good here, it should be a proper callback. A weak alias will be overriden if a piece of code is built into the kernel - not good, obviously. - The patch initializes the callback on AMD family 10h and 11h. - Added the more correct fallback printk of: No support for human readable MCE decoding on this CPU type. Transcribe the message and run it through 'mcelog --ascii' to decode. On CPUs that dont have a decoder. - Made the surrounding code more readable. Note that the callback allows us to have a default fallback - without having to check the CPU versions during the printout itself. When an EDAC module registers itself, it can install the decode-print function. (there's no unregister needed as this is core code.) version -v2 by Borislav Petkov: - add K8 to the set of supported CPUs - always build in edac_mce_amd since we use an early_initcall now - fix checkpatch warnings Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> LKML-Reference: <20091001141432.GA11410@aftab> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-01 14:14:32 +00:00
static struct notifier_block amd_mce_dec_nb = {
.notifier_call = amd_decode_mce,
};
x86: EDAC: MCE: Fix MCE decoding callback logic Make decoding of MCEs happen only on AMD hardware by registering a non-default callback only on CPU families which support it. While looking at the interaction of decode_mce() with the other MCE code i also noticed a few other things and made the following cleanups/fixes: - Fixed the mce_decode() weak alias - a weak alias is really not good here, it should be a proper callback. A weak alias will be overriden if a piece of code is built into the kernel - not good, obviously. - The patch initializes the callback on AMD family 10h and 11h. - Added the more correct fallback printk of: No support for human readable MCE decoding on this CPU type. Transcribe the message and run it through 'mcelog --ascii' to decode. On CPUs that dont have a decoder. - Made the surrounding code more readable. Note that the callback allows us to have a default fallback - without having to check the CPU versions during the printout itself. When an EDAC module registers itself, it can install the decode-print function. (there's no unregister needed as this is core code.) version -v2 by Borislav Petkov: - add K8 to the set of supported CPUs - always build in edac_mce_amd since we use an early_initcall now - fix checkpatch warnings Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> LKML-Reference: <20091001141432.GA11410@aftab> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-01 14:14:32 +00:00
static int __init mce_amd_init(void)
{
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
return 0;
if ((boot_cpu_data.x86 < 0xf || boot_cpu_data.x86 > 0x12) &&
(boot_cpu_data.x86 != 0x14 || boot_cpu_data.x86_model > 0xf))
return 0;
fam_ops = kzalloc(sizeof(struct amd_decoder_ops), GFP_KERNEL);
if (!fam_ops)
return -ENOMEM;
switch (boot_cpu_data.x86) {
case 0xf:
fam_ops->dc_mce = k8_dc_mce;
fam_ops->ic_mce = k8_ic_mce;
fam_ops->nb_mce = k8_nb_mce;
break;
case 0x10:
fam_ops->dc_mce = f10h_dc_mce;
fam_ops->ic_mce = k8_ic_mce;
fam_ops->nb_mce = f10h_nb_mce;
break;
case 0x11:
fam_ops->dc_mce = k8_dc_mce;
fam_ops->ic_mce = k8_ic_mce;
fam_ops->nb_mce = f10h_nb_mce;
break;
case 0x12:
fam_ops->dc_mce = f12h_dc_mce;
fam_ops->ic_mce = k8_ic_mce;
fam_ops->nb_mce = nb_noop_mce;
break;
case 0x14:
nb_err_cpumask = 0x3;
fam_ops->dc_mce = f14h_dc_mce;
fam_ops->ic_mce = f14h_ic_mce;
fam_ops->nb_mce = nb_noop_mce;
break;
default:
printk(KERN_WARNING "Huh? What family is that: %d?!\n",
boot_cpu_data.x86);
kfree(fam_ops);
return -EINVAL;
}
pr_info("MCE: In-kernel MCE decoding enabled.\n");
atomic_notifier_chain_register(&x86_mce_decoder_chain, &amd_mce_dec_nb);
x86: EDAC: MCE: Fix MCE decoding callback logic Make decoding of MCEs happen only on AMD hardware by registering a non-default callback only on CPU families which support it. While looking at the interaction of decode_mce() with the other MCE code i also noticed a few other things and made the following cleanups/fixes: - Fixed the mce_decode() weak alias - a weak alias is really not good here, it should be a proper callback. A weak alias will be overriden if a piece of code is built into the kernel - not good, obviously. - The patch initializes the callback on AMD family 10h and 11h. - Added the more correct fallback printk of: No support for human readable MCE decoding on this CPU type. Transcribe the message and run it through 'mcelog --ascii' to decode. On CPUs that dont have a decoder. - Made the surrounding code more readable. Note that the callback allows us to have a default fallback - without having to check the CPU versions during the printout itself. When an EDAC module registers itself, it can install the decode-print function. (there's no unregister needed as this is core code.) version -v2 by Borislav Petkov: - add K8 to the set of supported CPUs - always build in edac_mce_amd since we use an early_initcall now - fix checkpatch warnings Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andi Kleen <andi@firstfloor.org> LKML-Reference: <20091001141432.GA11410@aftab> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-01 14:14:32 +00:00
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);
kfree(fam_ops);
}
MODULE_DESCRIPTION("AMD MCE decoder");
MODULE_ALIAS("edac-mce-amd");
MODULE_LICENSE("GPL");
module_exit(mce_amd_exit);
#endif