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aha/drivers/edac/edac_mce_amd.c
Ingo Molnar f436f8bb73 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>
2009-10-02 15:42:18 +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);
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))
x86_mce_decode_callback = amd_decode_mce;
return 0;
}
early_initcall(mce_amd_init);
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