[PATCH 00/14] Fix the EDAC API

From: Mauro Carvalho Chehab
Date: Thu Mar 29 2012 - 13:07:43 EST

The EDAC API is broken for any memory controller that doesn't use
a DIMM rank as its primary unit.

That covers RAMBUS and FB-DIMM drivers, where it is impossible to
track a single rank, as the hank is hidden by a buffer controller
(AMB - Advanced Memory Buffer, in the case of FB-DIMM).

Also, newer Intel architectures (Nehalem and Sandy Bridge) brings
advanced memory controllers, where the cachesize can be different
than 128 bits, and up to 4 channels can be interlaced. The current
EDAC API doesn't work for those.

So, all drivers that need that do some sort of tricks to lie to the
EDAC core, in order for the memory to be somehow exposed. There are
several cases where this is done wrong.

The only way to fix is to create a new ABI capable of exporting what
the driver actually sees, and not some virtual information, produced
by the driver just to make the EDAC core happy.

As requested by Greg, the first step is to convert the EDAC MC code
to use struct device. That means that 3 drivers also need to be
converted (amd64, i7core and mpc85xx_edac), as they create their own

Those patches were compile-tested on all architectures.

It was also tested on all types of Memory Controllers with EDAC support
I was able to find at Red Hat Labs:
e752x_edac (a Xeon i3100 chipset)
i7core_edac (Nehalem)
sb_edac (Sandy Bridge E5)

Several of them with multiple memory controllers (the amd64 hardware
I used is the bigger one, in terms of MC, with 8 memory controllers).

There are 3 intended changes that are out of this series:

- ABI documentation. I'll write the ABI patch as soon as I
merge this series at -next;

- New API UE/CE error counters. They're needed, but, as the
discussions weren't finished, let's postpone it. I'll start work on
it after the merge of this series.

- MCA error trace. Also, there wasn't any agreement yet.
So, keep this out of this series, until we come to some conclusion.


Mauro Carvalho Chehab (14):
edac: rewrite the sysfs code to use struct device
mpc85xx_edac: convert sysfs logic to use struct device
amd64_edac: convert sysfs logic to use struct device
i7core_edac: convert it to use struct device
edac: Get rid of the old kobj's from the edac mc code
edac: add a new per-dimm API and make the old per-virtual-rank API
edac: add a sysfs node to report the maximum location for the system
edac: Add debufs nodes to allow doing fake error inject
edac: Create a per-Memory Controller bus
edac: Move grain/dtype/edac_type calculus to be out of channel loop
i82975x_edac: Test nr_pages earlier to save a few CPU cycles
i5100_edac: Fix a warning when compiled with 32 bits
i7300_edac: Get rid of some wrongly-solved rebase conflict
edac: Only expose csrows/channels on legacy API if they're populated

drivers/edac/Kconfig | 8 +
drivers/edac/amd64_edac.c | 43 +-
drivers/edac/amd64_edac.h | 29 +-
drivers/edac/amd64_edac_dbg.c | 89 ++--
drivers/edac/amd64_edac_inj.c | 128 +++--
drivers/edac/cpc925_edac.c | 54 +-
drivers/edac/e752x_edac.c | 31 +-
drivers/edac/e7xxx_edac.c | 32 +-
drivers/edac/edac_mc.c | 60 +-
drivers/edac/edac_mc_sysfs.c | 1322 +++++++++++++++++++++--------------------
drivers/edac/edac_module.c | 13 +-
drivers/edac/edac_module.h | 9 +-
drivers/edac/i5000_edac.c | 3 -
drivers/edac/i5100_edac.c | 4 +-
drivers/edac/i7300_edac.c | 3 -
drivers/edac/i7core_edac.c | 336 +++++++----
drivers/edac/i82875p_edac.c | 4 -
drivers/edac/i82975x_edac.c | 9 +-
drivers/edac/mpc85xx_edac.c | 93 ++--
include/linux/edac.h | 69 +--
20 files changed, 1250 insertions(+), 1089 deletions(-)


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