Messages in this thread Patch in this message |  | | From | patrickg <> | | Subject | [PATCH] sb_edac: Enable channel interleave hashing support for HSX/BDX | | Date | Tue, 29 Mar 2016 14:30:27 -0700 |
| |
Patch implements channel interleave hash if MCChanHashEn is set in HA on Haswell/Broadwell. If this bit was set, but no math was used to calculate the correct interleave index, sb_edac would place errors on incorrect channels.
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c index 93f0d41..02f6fd6 100644 --- a/drivers/edac/sb_edac.c +++ b/drivers/edac/sb_edac.c @@ -361,7 +361,7 @@ struct sbridge_pvt { struct sbridge_channel channel[NUM_CHANNELS];
/* Memory type detection */ - bool is_mirrored, is_lockstep, is_close_pg; + bool is_mirrored, is_lockstep, is_close_pg, is_ch_hash;
/* Fifo double buffers */ struct mce mce_entry[MCE_LOG_LEN]; @@ -1060,6 +1060,16 @@ static inline u8 sad_pkg_ha(u8 pkg) return (pkg >> 2) & 0x1; }
+/* Hash bits 12 through 27 against the two interleave bits */ +static u32 haswell_chan_hash(u32 interleave, u64 addr) { + u8 i=0, bits=0; + for (i=12; i<28; i+=2) { + bits = (addr >> i) & 0x3; + interleave ^= bits; + } + return interleave; +} + /**************************************************************************** Memory check routines ****************************************************************************/ @@ -1616,6 +1626,13 @@ static int get_dimm_config(struct mem_ctl_info *mci) KNL_MAX_CHANNELS : NUM_CHANNELS; u64 knl_mc_sizes[KNL_MAX_CHANNELS];
+ /* On HSX/BDX, check channel hash bit. */ + pvt->is_ch_hash = 0; + if (pvt->info.type == HASWELL || pvt->info.type == BROADWELL) { + pci_read_config_dword(pvt->pci_ha0, HASWELL_HASYSDEFEATURE2, ®); + pvt->is_ch_hash = GET_BITFIELD(reg, 21, 21); + } + if (pvt->info.type == HASWELL || pvt->info.type == BROADWELL || pvt->info.type == KNIGHTS_LANDING) pci_read_config_dword(pvt->pci_sad1, SAD_TARGET, ®); @@ -2120,10 +2137,13 @@ static int get_memory_error_data(struct mem_ctl_info *mci, ch_way = TAD_CH(reg) + 1; sck_way = 1 << TAD_SOCK(reg);
- if (ch_way == 3) + if (ch_way == 3) { idx = addr >> 6; - else + } else { idx = (addr >> (6 + sck_way + shiftup)) & 0x3; + if (pvt->is_ch_hash) + idx = haswell_chan_hash(idx, addr); + } idx = idx % ch_way;
/*
|  |