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A fix to sb_edac correcting channel reporting on Knights Landing.

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Merge tag 'edac_fixes_for_4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp

Pull EDAC fix from Borislav Petkov:
 "A fix to sb_edac correcting channel reporting on Knights Landing"

* tag 'edac_fixes_for_4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp:
  EDAC, sb_edac: Fix channel reporting on Knights Landing
This commit is contained in:
Linus Torvalds 2016-08-15 12:29:23 -07:00
commit f2fa30a8b8
1 changed files with 11 additions and 4 deletions
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15
drivers/edac/sb_edac.c
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@ -552,9 +552,9 @@ static const struct pci_id_table pci_dev_descr_haswell_table[] = {
/* Knight's Landing Support */
/*
* KNL's memory channels are swizzled between memory controllers.
* MC0 is mapped to CH3,5,6 and MC1 is mapped to CH0,1,2
* MC0 is mapped to CH3,4,5 and MC1 is mapped to CH0,1,2
*/
#define knl_channel_remap(channel) ((channel + 3) % 6)
#define knl_channel_remap(mc, chan) ((mc) ? (chan) : (chan) + 3)
/* Memory controller, TAD tables, error injection - 2-8-0, 2-9-0 (2 of these) */
#define PCI_DEVICE_ID_INTEL_KNL_IMC_MC 0x7840
@ -1286,7 +1286,7 @@ static u32 knl_get_mc_route(int entry, u32 reg)
mc = GET_BITFIELD(reg, entry*3, (entry*3)+2);
chan = GET_BITFIELD(reg, (entry*2) + 18, (entry*2) + 18 + 1);
return knl_channel_remap(mc*3 + chan);
return knl_channel_remap(mc, chan);
}
/*
@ -2997,8 +2997,15 @@ static void sbridge_mce_output_error(struct mem_ctl_info *mci,
} else {
char A = *("A");
channel = knl_channel_remap(channel);
/*
* Reported channel is in range 0-2, so we can't map it
* back to mc. To figure out mc we check machine check
* bank register that reported this error.
* bank15 means mc0 and bank16 means mc1.
*/
channel = knl_channel_remap(m->bank == 16, channel);
channel_mask = 1 << channel;
snprintf(msg, sizeof(msg),
"%s%s err_code:%04x:%04x channel:%d (DIMM_%c)",
overflow ? " OVERFLOW" : "",