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Subject[PATCH v2 00/24] EDAC, mc, ghes: Fixes and updates to improve memory error reporting
Date
Current arm64 systems that use the ghes driver lack kernel support for
a proper memory error reporting. Following issues are seen:

* Error record shows insufficient data, such as "EDAC MC0: 1 CE
unknown error on unknown label",

* DMI DIMM labels are not decoded for error reporting,

* No memory hierarchy known (NUMA topology),

* No per layer reporting,

* Significant differences to x86 error reports.

This patch set addresses all the above involving a rework of the
ghes_edac and edac_mc driver.

Patch #1-#4: Fix of grain calculation in edac_mc.c (#1) and
ghes_edac.c (#2) including unification of trace_mc_event() code (#3,
#4).

Patches #5-#12: General fixes and improvements of the ghes and mc
drivers. Most of it is a rework of existing code without functional
changes to improve, ease, cleanup and join common code. The changes
are in preparation of and a requirment for the following patches that
improve ghes error reports.

Patches #13-#22: Improve error memory reporting of the ghes driver
including:

* support for legacy API (patch #12),

* NUMA detection, one mc device per node (patches #13-#16),

* support for DMI DIMM label information (patch #17),

* per-layer reporting (patches #18-#20).

Patch #23: Documentation updates.

Patch #24: Disable legacy API for ARM64 ghes driver (optional, need to
be ack'ed by James, I vote for not applying it).

All changes should keep existing systems working as before. All
systems that are using ghes will also benefit from the update. There
is a fallback in the ghes driver that disables NUMA or enters a fake
mode if some of the NUMA or DIMM information is inconsistent. So it
should not break existing systems that provide broken firmware tables.

The series has been tested on a Marvell/Cavium ThunderX2 system. Here
some example logs and sysfs entries:

Boot log of memory hierarchy and dimm detection:

EDAC DEBUG: mem_info_setup: DIMM0: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x0038, label: N0 DIMM_A0
EDAC DEBUG: mem_info_setup: DIMM1: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x0039, label: N0 DIMM_B0
EDAC DEBUG: mem_info_setup: DIMM2: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003a, label: N0 DIMM_C0
EDAC DEBUG: mem_info_setup: DIMM3: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003b, label: N0 DIMM_D0
EDAC DEBUG: mem_info_setup: DIMM4: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003c, label: N0 DIMM_E0
EDAC DEBUG: mem_info_setup: DIMM5: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003d, label: N0 DIMM_F0
EDAC DEBUG: mem_info_setup: DIMM6: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003e, label: N0 DIMM_G0
EDAC DEBUG: mem_info_setup: DIMM7: Found mem range [0x0000008800000000-0x0000009ffcffffff] on node 0, handle: 0x003f, label: N0 DIMM_H0
EDAC DEBUG: mem_info_setup: DIMM8: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x004f, label: N1 DIMM_I0
EDAC DEBUG: mem_info_setup: DIMM9: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0050, label: N1 DIMM_J0
EDAC DEBUG: mem_info_setup: DIMM10: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0051, label: N1 DIMM_K0
EDAC DEBUG: mem_info_setup: DIMM11: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0052, label: N1 DIMM_L0
EDAC DEBUG: mem_info_setup: DIMM12: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0053, label: N1 DIMM_M0
EDAC DEBUG: mem_info_setup: DIMM13: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0054, label: N1 DIMM_N0
EDAC DEBUG: mem_info_setup: DIMM14: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0055, label: N1 DIMM_O0
EDAC DEBUG: mem_info_setup: DIMM15: Found mem range [0x0000009ffd000000-0x000000bffcffffff] on node 1, handle: 0x0056, label: N1 DIMM_P0

DIMM label entries in sysfs:

# grep . /sys/devices/system/edac/mc/mc*/dimm*/dimm_label
/sys/devices/system/edac/mc/mc0/dimm0/dimm_label:N0 DIMM_A0
/sys/devices/system/edac/mc/mc0/dimm1/dimm_label:N0 DIMM_B0
/sys/devices/system/edac/mc/mc0/dimm2/dimm_label:N0 DIMM_C0
/sys/devices/system/edac/mc/mc0/dimm3/dimm_label:N0 DIMM_D0
/sys/devices/system/edac/mc/mc0/dimm4/dimm_label:N0 DIMM_E0
/sys/devices/system/edac/mc/mc0/dimm5/dimm_label:N0 DIMM_F0
/sys/devices/system/edac/mc/mc0/dimm6/dimm_label:N0 DIMM_G0
/sys/devices/system/edac/mc/mc0/dimm7/dimm_label:N0 DIMM_H0
/sys/devices/system/edac/mc/mc1/dimm0/dimm_label:N1 DIMM_I0
/sys/devices/system/edac/mc/mc1/dimm1/dimm_label:N1 DIMM_J0
/sys/devices/system/edac/mc/mc1/dimm2/dimm_label:N1 DIMM_K0
/sys/devices/system/edac/mc/mc1/dimm3/dimm_label:N1 DIMM_L0
/sys/devices/system/edac/mc/mc1/dimm4/dimm_label:N1 DIMM_M0
/sys/devices/system/edac/mc/mc1/dimm5/dimm_label:N1 DIMM_N0
/sys/devices/system/edac/mc/mc1/dimm6/dimm_label:N1 DIMM_O0
/sys/devices/system/edac/mc/mc1/dimm7/dimm_label:N1 DIMM_P0

Memory error reports in the kernel log:

{1}[Hardware Error]: Error 4, type: corrected
{1}[Hardware Error]: section_type: memory error
{1}[Hardware Error]: error_status: 0x0000000000000400
{1}[Hardware Error]: physical_address: 0x000000bd0db44000
{1}[Hardware Error]: node: 1 card: 3 module: 0 rank: 0 bank: 256 column: 10 bit_position: 16
{1}[Hardware Error]: DIMM location: N1 DIMM_L0
EDAC MC1: 1 CE ghes_mc on N1 DIMM_L0 (card:3 module:0 page:0xbd0db44 offset:0x0 grain:0 syndrome:0x0 - APEI location: node:1 card:3 module:0 rank:0 bank:256 col:10 bit_pos:16 handle:0x0052 status(0x0000000000000400): Storage error in DRAM memory)

Error counters in sysfs (zero counters dropped):

# find /sys/devices/system/edac/mc/ -name \*count | sort -V | xargs grep . | sed -e '/:0/d'
/sys/devices/system/edac/mc/mc0/ce_count:5
/sys/devices/system/edac/mc/mc0/csrow0/ce_count:1
/sys/devices/system/edac/mc/mc0/csrow0/ch0_ce_count:1
/sys/devices/system/edac/mc/mc0/csrow3/ce_count:1
/sys/devices/system/edac/mc/mc0/csrow3/ch0_ce_count:1
/sys/devices/system/edac/mc/mc0/csrow4/ce_count:1
/sys/devices/system/edac/mc/mc0/csrow4/ch0_ce_count:1
/sys/devices/system/edac/mc/mc0/csrow6/ce_count:2
/sys/devices/system/edac/mc/mc0/csrow6/ch0_ce_count:2
/sys/devices/system/edac/mc/mc0/dimm0/dimm_ce_count:1
/sys/devices/system/edac/mc/mc0/dimm3/dimm_ce_count:1
/sys/devices/system/edac/mc/mc0/dimm4/dimm_ce_count:1
/sys/devices/system/edac/mc/mc0/dimm6/dimm_ce_count:2
/sys/devices/system/edac/mc/mc1/ce_count:4
/sys/devices/system/edac/mc/mc1/csrow0/ce_count:1
/sys/devices/system/edac/mc/mc1/csrow0/ch0_ce_count:1
/sys/devices/system/edac/mc/mc1/csrow3/ce_count:1
/sys/devices/system/edac/mc/mc1/csrow3/ch0_ce_count:1
/sys/devices/system/edac/mc/mc1/csrow6/ce_count:2
/sys/devices/system/edac/mc/mc1/csrow6/ch0_ce_count:2
/sys/devices/system/edac/mc/mc1/dimm0/dimm_ce_count:1
/sys/devices/system/edac/mc/mc1/dimm3/dimm_ce_count:1
/sys/devices/system/edac/mc/mc1/dimm6/dimm_ce_count:2


v2 updates:

* rebased onto bp/for-next (b2572772d13e: EDAC: Make
edac_debugfs_create_x*() return void),

* added patches to fix grain calculation (put this at the beginning
of the series to apply them separately),

* modified sysfs init functions based (EDAC, mc: Fix and improve
sysfs init functions) on Greg's fixes (f5d59da9663d EDAC/sysfs:
Drop device references properly),

* removed duplicate code for mem_info_setup*() by moving it to
ghes_dimm_info_init(),

* fix bisecting of series,

* made mem_info static,

* renamed function mci_add_dimm_info() to mem_info_prepare_mci(),

* added patch to move struct member smbios_handle to struct
ghes_dimm_info,

* renamed ghes_mem_info.num_per_node[] to
ghes_mem_info.dimms_per_node[],

* removed unused mem_info.enable_numa,

* removed unused mem_info.num_nodes,

* fixed dimm counters after sysfs reset_counters.


Robert Richter (24):
EDAC, mc: Fix grain_bits calculation
EDAC, ghes: Fix grain calculation
EDAC, ghes: Remove pvt->detail_location string
EDAC, ghes: Unify trace_mc_event() code with edac_mc driver
EDAC, mc: Fix and improve sysfs init functions
EDAC: Kill EDAC_DIMM_PTR() macro
EDAC: Kill EDAC_DIMM_OFF() macro
EDAC: Introduce mci_for_each_dimm() iterator
EDAC, mc: Cleanup _edac_mc_free() code
EDAC, mc: Remove per layer counters
EDAC, mc: Rework edac_raw_mc_handle_error() to use struct dimm_info
EDAC, ghes: Use standard kernel macros for page calculations
EDAC, ghes: Add support for legacy API counters
EDAC, ghes: Rework memory hierarchy detection
EDAC, ghes: Extract numa node information for each dimm
EDAC, ghes: Moving code around ghes_edac_register()
EDAC, ghes: Create one memory controller device per node
EDAC, ghes: Fill sysfs with the DMI DIMM label information
EDAC, mc: Introduce edac_mc_alloc_by_dimm() for per dimm allocation
EDAC, ghes: Identify dimm by node, card, module and handle
EDAC, ghes: Enable per-layer reporting based on card/module
EDAC, ghes: Move struct member smbios_handle to struct ghes_dimm_info
EDAC, Documentation: Describe CPER module definition and DIMM ranks
EDAC, ghes: Disable legacy API for ARM64

Documentation/admin-guide/ras.rst | 31 +-
drivers/edac/edac_mc.c | 385 ++++++++++---------
drivers/edac/edac_mc.h | 33 +-
drivers/edac/edac_mc_sysfs.c | 95 ++---
drivers/edac/ghes_edac.c | 609 +++++++++++++++++++++++-------
drivers/edac/i10nm_base.c | 3 +-
drivers/edac/i3200_edac.c | 3 +-
drivers/edac/i5000_edac.c | 5 +-
drivers/edac/i5100_edac.c | 14 +-
drivers/edac/i5400_edac.c | 4 +-
drivers/edac/i7300_edac.c | 3 +-
drivers/edac/i7core_edac.c | 3 +-
drivers/edac/ie31200_edac.c | 7 +-
drivers/edac/pnd2_edac.c | 4 +-
drivers/edac/sb_edac.c | 2 +-
drivers/edac/skx_base.c | 3 +-
drivers/edac/ti_edac.c | 2 +-
include/linux/edac.h | 141 ++++---
18 files changed, 842 insertions(+), 505 deletions(-)

--
2.20.1

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