EDAC: Fix csrow size reported in sysfs

On csrow-based memory controllers, we combine the csrow size from both
channels and there's no need to do that again in csrow_size_show which
leads to double the size of a csrow.

Fix it.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

drivers/edac/amd64_edac.c

@@ -2174,6 +2174,7 @@ static int init_csrows(struct mem_ctl_info *mci)
 			dimm->edac_mode = edac_mode;
 			dimm->nr_pages = nr_pages;
 		}
+		csrow->nr_pages = nr_pages;
 	}
 
 	return empty;

drivers/edac/edac_mc_sysfs.c

@@ -180,6 +180,9 @@ static ssize_t csrow_size_show(struct device *dev,
 	int i;
 	u32 nr_pages = 0;
 
+	if (csrow->mci->csbased)
+		return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
+
 	for (i = 0; i < csrow->nr_channels; i++)
 		nr_pages += csrow->channels[i]->dimm->nr_pages;
 	return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));

include/linux/edac.h

@@ -533,6 +533,7 @@ struct csrow_info {
 
 	u32 ue_count;		/* Uncorrectable Errors for this csrow */
 	u32 ce_count;		/* Correctable Errors for this csrow */
+	u32 nr_pages;		/* combined pages count of all channels */
 
 	struct mem_ctl_info *mci;	/* the parent */