From: Tony Luck <tony.luck@xxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit f7cf2a22a2896d3b3595b71d7936b6d7a3316b00 ]
Haswell moved the TOLM/TOHM registers to a different device and offset.
The sb_edac driver accounted for the change of device, but not for the
new offset. There was also a typo in the constant to fill in the low
26 bits (was 0x1ffffff, should be 0x3ffffff).
This resulted in a bogus value for the top of low memory:
EDAC DEBUG: get_memory_layout: TOLM: 0.032 GB (0x0000000001ffffff)
which would result in EDAC refusing to translate addresses for
errors above the bogus value and below 4GB:
sbridge MC3: HANDLING MCE MEMORY ERROR
sbridge MC3: CPU 0: Machine Check Event: 0 Bank 7: 8c00004000010090
sbridge MC3: TSC 0
sbridge MC3: ADDR 2000000
sbridge MC3: MISC 523eac86
sbridge MC3: PROCESSOR 0:306f3 TIME 1414600951 SOCKET 0 APIC 0
MC3: 1 CE Error at TOLM area, on addr 0x02000000 on any memory ( page:0x0 offset:0x0 grain:32 syndrome:0x0)
With the fix we see the correct TOLM value:
DEBUG: get_memory_layout: TOLM: 2.048 GB (0x000000007fffffff)
and we decode address 2000000 correctly:
sbridge MC3: HANDLING MCE MEMORY ERROR
sbridge MC3: CPU 0: Machine Check Event: 0 Bank 7: 8c00004000010090
sbridge MC3: TSC 0
sbridge MC3: ADDR 2000000
sbridge MC3: MISC 523e1086
sbridge MC3: PROCESSOR 0:306f3 TIME 1414601319 SOCKET 0 APIC 0
DEBUG: get_memory_error_data: SAD interleave package: 0 = CPU socket 0, HA 0, shiftup: 0
DEBUG: get_memory_error_data: TAD#0: address 0x0000000002000000 < 0x000000007fffffff, socket interleave 1, channel interleave 4 (offset 0x00000000), index 0, base ch: 0, ch mask: 0x01
DEBUG: get_memory_error_data: RIR#0, limit: 4.095 GB (0x00000000ffffffff), way: 1
DEBUG: get_memory_error_data: RIR#0: channel address 0x00200000 < 0xffffffff, RIR interleave 0, index 0
DEBUG: sbridge_mce_output_error: area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0
MC3: 1 CE memory read error on CPU_SrcID#0_Channel#0_DIMM#0 (channel:0 slot:0 page:0x2000 offset:0x0 grain:32 syndrome:0x0 - area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0)
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Acked-by: Aristeu Rozanski <aris@xxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/edac/sb_edac.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 3cdaac8..3f910bf 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -135,6 +135,7 @@ static inline int sad_pkg(const struct interleave_pkg *table, u32 reg,
#define TOLM 0x80
#define TOHM 0x84
+#define HASWELL_TOLM 0xd0
#define HASWELL_TOHM_0 0xd4
#define HASWELL_TOHM_1 0xd8
@@ -706,8 +707,8 @@ static u64 haswell_get_tolm(struct sbridge_pvt *pvt)
{
u32 reg;
- pci_read_config_dword(pvt->info.pci_vtd, TOLM, ®);
- return (GET_BITFIELD(reg, 26, 31) << 26) | 0x1ffffff;
+ pci_read_config_dword(pvt->info.pci_vtd, HASWELL_TOLM, ®);
+ return (GET_BITFIELD(reg, 26, 31) << 26) | 0x3ffffff;
}
static u64 haswell_get_tohm(struct sbridge_pvt *pvt)
--
2.1.0
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