edac: Create a dimm struct and move the labels into it

The way a DIMM is currently represented implies that they're
linked into a per-csrow struct. However, some drivers don't see
csrows, as they're ridden behind some chip like the AMB's
on FBDIMM's, for example.

This forced drivers to fake^Wvirtualize a csrow struct, and to create
a mess under csrow/channel original's concept.

Move the DIMM labels into a per-DIMM struct, and add there
the real location of the socket, in terms of csrow/channel.
Latter patches will modify the location to properly represent the
memory architecture.

All other drivers will use a per-csrow type of location.
Some of those drivers will require a latter conversion, as
they also fake the csrows internally.

TODO: While this patch doesn't change the existing behavior, on
csrows-based memory controllers, a csrow/channel pair points to a memory
rank. There's a known bug at the EDAC core that allows having different
labels for the same DIMM, if it has more than one rank. A latter patch
is need to merge the several ranks for a DIMM into the same dimm_info
struct, in order to avoid having different labels for the same DIMM.

The edac_mc_alloc() will now contain a per-dimm initialization loop that
will be changed by latter patches in order to match other types of
memory architectures.

Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Reviewed-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Cc: Ranganathan Desikan <ravi@jetztechnologies.com>
Cc: "Arvind R." <arvino55@gmail.com>
Cc: "Niklas Söderlund" <niklas.soderlund@ericsson.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
index d500749464ea..d55e5529734c 100644
--- a/drivers/edac/i5100_edac.c
+++ b/drivers/edac/i5100_edac.c
@@ -433,7 +433,7 @@ static void i5100_handle_ce(struct mem_ctl_info *mci,
                 "CE chan %d, bank %u, rank %u, syndrome 0x%lx, "
                 "cas %u, ras %u, csrow %u, label \"%s\": %s\n",
                 chan, bank, rank, syndrome, cas, ras,
-                csrow, mci->csrows[csrow].channels[0].label, msg);
+                csrow, mci->csrows[csrow].channels[0].dimm->label, msg);
 
         mci->ce_count++;
         mci->csrows[csrow].ce_count++;
@@ -455,7 +455,7 @@ static void i5100_handle_ue(struct mem_ctl_info *mci,
                 "UE chan %d, bank %u, rank %u, syndrome 0x%lx, "
                 "cas %u, ras %u, csrow %u, label \"%s\": %s\n",
                 chan, bank, rank, syndrome, cas, ras,
-                csrow, mci->csrows[csrow].channels[0].label, msg);
+                csrow, mci->csrows[csrow].channels[0].dimm->label, msg);
 
         mci->ue_count++;
         mci->csrows[csrow].ue_count++;
@@ -868,8 +868,8 @@ static void __devinit i5100_init_csrows(struct mem_ctl_info *mci)
                 mci->csrows[i].channels[0].chan_idx = 0;
                 mci->csrows[i].channels[0].ce_count = 0;
                 mci->csrows[i].channels[0].csrow = mci->csrows + i;
-                snprintf(mci->csrows[i].channels[0].label,
-                         sizeof(mci->csrows[i].channels[0].label),
+                snprintf(mci->csrows[i].channels[0].dimm->label,
+                         sizeof(mci->csrows[i].channels[0].dimm->label),
                          "DIMM%u", i5100_rank_to_slot(mci, chan, rank));
 
                 total_pages += npages;