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, 35 insertions, 12 deletions

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index feef7733fae7..c1aae7233022 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -44,7 +44,7 @@ static void edac_mc_dump_channel(struct rank_info *chan)
 	debugf4("\tchannel = %p\n", chan);
 	debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
 	debugf4("\tchannel->ce_count = %d\n", chan->ce_count);
-	debugf4("\tchannel->label = '%s'\n", chan->label);
+	debugf4("\tchannel->label = '%s'\n", chan->dimm->label);
 	debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
 }
 
@@ -157,6 +157,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
 	struct mem_ctl_info *mci;
 	struct csrow_info *csi, *csrow;
 	struct rank_info *chi, *chp, *chan;
+	struct dimm_info *dimm;
 	void *pvt;
 	unsigned size;
 	int row, chn;
@@ -170,7 +171,8 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
 	mci = (struct mem_ctl_info *)0;
 	csi = edac_align_ptr(&mci[1], sizeof(*csi));
 	chi = edac_align_ptr(&csi[nr_csrows], sizeof(*chi));
-	pvt = edac_align_ptr(&chi[nr_chans * nr_csrows], sz_pvt);
+	dimm = edac_align_ptr(&chi[nr_chans * nr_csrows], sizeof(*dimm));
+	pvt = edac_align_ptr(&dimm[nr_chans * nr_csrows], sz_pvt);
 	size = ((unsigned long)pvt) + sz_pvt;
 
 	mci = kzalloc(size, GFP_KERNEL);
@@ -182,14 +184,22 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
 	 */
 	csi = (struct csrow_info *)(((char *)mci) + ((unsigned long)csi));
 	chi = (struct rank_info *)(((char *)mci) + ((unsigned long)chi));
+	dimm = (struct dimm_info *)(((char *)mci) + ((unsigned long)dimm));
 	pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL;
 
 	/* setup index and various internal pointers */
 	mci->mc_idx = edac_index;
 	mci->csrows = csi;
+	mci->dimms  = dimm;
 	mci->pvt_info = pvt;
 	mci->nr_csrows = nr_csrows;
 
+	/*
+	 * For now, assumes that a per-csrow arrangement for dimms.
+	 * This will be latter changed.
+	 */
+	dimm = mci->dimms;
+
 	for (row = 0; row < nr_csrows; row++) {
 		csrow = &csi[row];
 		csrow->csrow_idx = row;
@@ -202,6 +212,12 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
 			chan = &chp[chn];
 			chan->chan_idx = chn;
 			chan->csrow = csrow;
+
+			mci->csrows[row].channels[chn].dimm = dimm;
+			dimm->csrow = row;
+			dimm->csrow_channel = chn;
+			dimm++;
+			mci->nr_dimms++;
 		}
 	}
 
@@ -678,6 +694,7 @@ void edac_mc_handle_ce(struct mem_ctl_info *mci,
 		int row, int channel, const char *msg)
 {
 	unsigned long remapped_page;
+	char *label = NULL;
 
 	debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
 
@@ -701,6 +718,8 @@ void edac_mc_handle_ce(struct mem_ctl_info *mci,
 		return;
 	}
 
+	label = mci->csrows[row].channels[channel].dimm->label;
+
 	if (edac_mc_get_log_ce())
 		/* FIXME - put in DIMM location */
 		edac_mc_printk(mci, KERN_WARNING,
@@ -708,7 +727,7 @@ void edac_mc_handle_ce(struct mem_ctl_info *mci,
 			"0x%lx, row %d, channel %d, label \"%s\": %s\n",
 			page_frame_number, offset_in_page,
 			mci->csrows[row].grain, syndrome, row, channel,
-			mci->csrows[row].channels[channel].label, msg);
+			label, msg);
 
 	mci->ce_count++;
 	mci->csrows[row].ce_count++;
@@ -754,6 +773,7 @@ void edac_mc_handle_ue(struct mem_ctl_info *mci,
 	char *pos = labels;
 	int chan;
 	int chars;
+	char *label = NULL;
 
 	debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
 
@@ -767,15 +787,15 @@ void edac_mc_handle_ue(struct mem_ctl_info *mci,
 		return;
 	}
 
-	chars = snprintf(pos, len + 1, "%s",
-			 mci->csrows[row].channels[0].label);
+	label = mci->csrows[row].channels[0].dimm->label;
+	chars = snprintf(pos, len + 1, "%s", label);
 	len -= chars;
 	pos += chars;
 
 	for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0);
 		chan++) {
-		chars = snprintf(pos, len + 1, ":%s",
-				 mci->csrows[row].channels[chan].label);
+		label = mci->csrows[row].channels[chan].dimm->label;
+		chars = snprintf(pos, len + 1, ":%s", label);
 		len -= chars;
 		pos += chars;
 	}
@@ -824,6 +844,7 @@ void edac_mc_handle_fbd_ue(struct mem_ctl_info *mci,
 	char labels[len + 1];
 	char *pos = labels;
 	int chars;
+	char *label;
 
 	if (csrow >= mci->nr_csrows) {
 		/* something is wrong */
@@ -858,12 +879,12 @@ void edac_mc_handle_fbd_ue(struct mem_ctl_info *mci,
 	mci->csrows[csrow].ue_count++;
 
 	/* Generate the DIMM labels from the specified channels */
-	chars = snprintf(pos, len + 1, "%s",
-			 mci->csrows[csrow].channels[channela].label);
+	label = mci->csrows[csrow].channels[channela].dimm->label;
+	chars = snprintf(pos, len + 1, "%s", label);
 	len -= chars;
 	pos += chars;
 	chars = snprintf(pos, len + 1, "-%s",
-			 mci->csrows[csrow].channels[channelb].label);
+			mci->csrows[csrow].channels[channelb].dimm->label);
 
 	if (edac_mc_get_log_ue())
 		edac_mc_printk(mci, KERN_EMERG,
@@ -885,6 +906,7 @@ EXPORT_SYMBOL(edac_mc_handle_fbd_ue);
 void edac_mc_handle_fbd_ce(struct mem_ctl_info *mci,
 			unsigned int csrow, unsigned int channel, char *msg)
 {
+	char *label = NULL;
 
 	/* Ensure boundary values */
 	if (csrow >= mci->nr_csrows) {
@@ -904,12 +926,13 @@ void edac_mc_handle_fbd_ce(struct mem_ctl_info *mci,
 		return;
 	}
 
+	label = mci->csrows[csrow].channels[channel].dimm->label;
+
 	if (edac_mc_get_log_ce())
 		/* FIXME - put in DIMM location */
 		edac_mc_printk(mci, KERN_WARNING,
 			"CE row %d, channel %d, label \"%s\": %s\n",
-			csrow, channel,
-			mci->csrows[csrow].channels[channel].label, msg);
+			csrow, channel, label, msg);
 
 	mci->ce_count++;
 	mci->csrows[csrow].ce_count++;