edac_mc: Cleanup per-dimm_info debug messages

The edac_mc_alloc() routine allocates one dimm_info device for all
possible memories, including the non-filled ones. The debug messages
there are somewhat confusing. So, cleans them, by moving the code
that prints the memory location to edac_mc, and using it on both
edac_mc_sysfs and edac_mc.

Also, only dumps information when DIMM/ranks are actually
filled.

After this patch, a dimm-based memory controller will print the debug
info as:

[ 1011.380027] EDAC DEBUG: edac_mc_dump_csrow: csrow->csrow_idx = 0
[ 1011.380029] EDAC DEBUG: edac_mc_dump_csrow:   csrow = ffff8801169be000
[ 1011.380031] EDAC DEBUG: edac_mc_dump_csrow:   csrow->first_page = 0x0
[ 1011.380032] EDAC DEBUG: edac_mc_dump_csrow:   csrow->last_page = 0x0
[ 1011.380034] EDAC DEBUG: edac_mc_dump_csrow:   csrow->page_mask = 0x0
[ 1011.380035] EDAC DEBUG: edac_mc_dump_csrow:   csrow->nr_channels = 3
[ 1011.380037] EDAC DEBUG: edac_mc_dump_csrow:   csrow->channels = ffff8801149c2840
[ 1011.380039] EDAC DEBUG: edac_mc_dump_csrow:   csrow->mci = ffff880117426000
[ 1011.380041] EDAC DEBUG: edac_mc_dump_channel:   channel->chan_idx = 0
[ 1011.380042] EDAC DEBUG: edac_mc_dump_channel:     channel = ffff8801149c2860
[ 1011.380044] EDAC DEBUG: edac_mc_dump_channel:     channel->csrow = ffff8801169be000
[ 1011.380046] EDAC DEBUG: edac_mc_dump_channel:     channel->dimm = ffff88010fe90400
...
[ 1011.380095] EDAC DEBUG: edac_mc_dump_dimm: dimm0: channel 0 slot 0 mapped as virtual row 0, chan 0
[ 1011.380097] EDAC DEBUG: edac_mc_dump_dimm:   dimm = ffff88010fe90400
[ 1011.380099] EDAC DEBUG: edac_mc_dump_dimm:   dimm->label = 'CPU#0Channel#0_DIMM#0'
[ 1011.380101] EDAC DEBUG: edac_mc_dump_dimm:   dimm->nr_pages = 0x40000
[ 1011.380103] EDAC DEBUG: edac_mc_dump_dimm:   dimm->grain = 8
[ 1011.380104] EDAC DEBUG: edac_mc_dump_dimm:   dimm->nr_pages = 0x40000
...

(a rank-based memory controller would print, instead of "dimm?", "rank?"
 on the above debug info)

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 62 insertions, 47 deletions

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index a39fe6f966e3..98c759dc0d5d 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -42,44 +42,63 @@
 static DEFINE_MUTEX(mem_ctls_mutex);
 static LIST_HEAD(mc_devices);
 
+unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
+                                 unsigned len)
+{
+        struct mem_ctl_info *mci = dimm->mci;
+        int i, n, count = 0;
+        char *p = buf;
+
+        for (i = 0; i < mci->n_layers; i++) {
+                n = snprintf(p, len, "%s %d ",
+                              edac_layer_name[mci->layers[i].type],
+                              dimm->location[i]);
+                p += n;
+                len -= n;
+                count += n;
+                if (!len)
+                        break;
+        }
+
+        return count;
+}
+
 #ifdef CONFIG_EDAC_DEBUG
 
 static void edac_mc_dump_channel(struct rank_info *chan)
 {
-        edac_dbg(4, "\tchannel = %p\n", chan);
-        edac_dbg(4, "\tchannel->chan_idx = %d\n", chan->chan_idx);
-        edac_dbg(4, "\tchannel->csrow = %p\n", chan->csrow);
-        edac_dbg(4, "\tchannel->dimm = %p\n", chan->dimm);
+        edac_dbg(4, "  channel->chan_idx = %d\n", chan->chan_idx);
+        edac_dbg(4, "    channel = %p\n", chan);
+        edac_dbg(4, "    channel->csrow = %p\n", chan->csrow);
+        edac_dbg(4, "    channel->dimm = %p\n", chan->dimm);
 }
 
-static void edac_mc_dump_dimm(struct dimm_info *dimm)
+static void edac_mc_dump_dimm(struct dimm_info *dimm, int number)
 {
-        int i;
-
-        edac_dbg(4, "\tdimm = %p\n", dimm);
-        edac_dbg(4, "\tdimm->label = '%s'\n", dimm->label);
-        edac_dbg(4, "\tdimm->nr_pages = 0x%x\n", dimm->nr_pages);
-        edac_dbg(4, "\tdimm location ");
-        for (i = 0; i < dimm->mci->n_layers; i++) {
-                printk(KERN_CONT "%d", dimm->location[i]);
-                if (i < dimm->mci->n_layers - 1)
-                        printk(KERN_CONT ".");
-        }
-        printk(KERN_CONT "\n");
-        edac_dbg(4, "\tdimm->grain = %d\n", dimm->grain);
-        edac_dbg(4, "\tdimm->nr_pages = 0x%x\n", dimm->nr_pages);
+        char location[80];
+
+        edac_dimm_info_location(dimm, location, sizeof(location));
+
+        edac_dbg(4, "%s%i: %smapped as virtual row %d, chan %d\n",
+                 dimm->mci->mem_is_per_rank ? "rank" : "dimm",
+                 number, location, dimm->csrow, dimm->cschannel);
+        edac_dbg(4, "  dimm = %p\n", dimm);
+        edac_dbg(4, "  dimm->label = '%s'\n", dimm->label);
+        edac_dbg(4, "  dimm->nr_pages = 0x%x\n", dimm->nr_pages);
+        edac_dbg(4, "  dimm->grain = %d\n", dimm->grain);
+        edac_dbg(4, "  dimm->nr_pages = 0x%x\n", dimm->nr_pages);
 }
 
 static void edac_mc_dump_csrow(struct csrow_info *csrow)
 {
-        edac_dbg(4, "\tcsrow = %p\n", csrow);
-        edac_dbg(4, "\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
-        edac_dbg(4, "\tcsrow->first_page = 0x%lx\n", csrow->first_page);
-        edac_dbg(4, "\tcsrow->last_page = 0x%lx\n", csrow->last_page);
-        edac_dbg(4, "\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
-        edac_dbg(4, "\tcsrow->nr_channels = %d\n", csrow->nr_channels);
-        edac_dbg(4, "\tcsrow->channels = %p\n", csrow->channels);
-        edac_dbg(4, "\tcsrow->mci = %p\n", csrow->mci);
+        edac_dbg(4, "csrow->csrow_idx = %d\n", csrow->csrow_idx);
+        edac_dbg(4, "  csrow = %p\n", csrow);
+        edac_dbg(4, "  csrow->first_page = 0x%lx\n", csrow->first_page);
+        edac_dbg(4, "  csrow->last_page = 0x%lx\n", csrow->last_page);
+        edac_dbg(4, "  csrow->page_mask = 0x%lx\n", csrow->page_mask);
+        edac_dbg(4, "  csrow->nr_channels = %d\n", csrow->nr_channels);
+        edac_dbg(4, "  csrow->channels = %p\n", csrow->channels);
+        edac_dbg(4, "  csrow->mci = %p\n", csrow->mci);
 }
 
 static void edac_mc_dump_mci(struct mem_ctl_info *mci)
@@ -327,8 +346,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
         memset(&pos, 0, sizeof(pos));
         row = 0;
         chn = 0;
-        edac_dbg(4, "initializing %d %s\n",
-                 tot_dimms, per_rank ? "ranks" : "dimms");
         for (i = 0; i < tot_dimms; i++) {
                 chan = mci->csrows[row]->channels[chn];
                 off = EDAC_DIMM_OFF(layer, n_layers, pos[0], pos[1], pos[2]);
@@ -341,10 +358,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
                 mci->dimms[off] = dimm;
                 dimm->mci = mci;
 
-                edac_dbg(2, "%d: %s%i (%d:%d:%d): row %d, chan %d\n",
-                         i, per_rank ? "rank" : "dimm", off,
-                         pos[0], pos[1], pos[2], row, chn);
-
                 /*
                  * Copy DIMM location and initialize it.
                  */
@@ -700,14 +713,22 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
                 int i;
 
                 for (i = 0; i < mci->nr_csrows; i++) {
+                        struct csrow_info *csrow = mci->csrows[i];
+                        u32 nr_pages = 0;
                         int j;
 
-                        edac_mc_dump_csrow(mci->csrows[i]);
-                        for (j = 0; j < mci->csrows[i]->nr_channels; j++)
-                                edac_mc_dump_channel(mci->csrows[i]->channels[j]);
+                        for (j = 0; j < csrow->nr_channels; j++)
+                                nr_pages += csrow->channels[j]->dimm->nr_pages;
+                        if (!nr_pages)
+                                continue;
+                        edac_mc_dump_csrow(csrow);
+                        for (j = 0; j < csrow->nr_channels; j++)
+                                if (csrow->channels[j]->dimm->nr_pages)
+                                        edac_mc_dump_channel(csrow->channels[j]);
                 }
                 for (i = 0; i < mci->tot_dimms; i++)
-                        edac_mc_dump_dimm(mci->dimms[i]);
+                        if (mci->dimms[i]->nr_pages)
+                                edac_mc_dump_dimm(mci->dimms[i], i);
         }
 #endif
         mutex_lock(&mem_ctls_mutex);
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index eace646b57f0..7079a428c8ea 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -485,17 +485,8 @@ static ssize_t dimmdev_location_show(struct device *dev,
                                      struct device_attribute *mattr, char *data)
 {
         struct dimm_info *dimm = to_dimm(dev);
-        struct mem_ctl_info *mci = dimm->mci;
-        int i;
-        char *p = data;
-
-        for (i = 0; i < mci->n_layers; i++) {
-                p += sprintf(p, "%s %d ",
-                             edac_layer_name[mci->layers[i].type],
-                             dimm->location[i]);
-        }
 
-        return p - data;
+        return edac_dimm_info_location(dimm, data, PAGE_SIZE);
 }
 
 static ssize_t dimmdev_label_show(struct device *dev,
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index 1af13676e857..62de640c8c8a 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -34,6 +34,9 @@ extern int edac_mc_get_panic_on_ue(void);
 extern int edac_get_poll_msec(void);
 extern int edac_mc_get_poll_msec(void);
 
+unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
+                                 unsigned len);
+
         /* on edac_device.c */
 extern int edac_device_register_sysfs_main_kobj(
                                 struct edac_device_ctl_info *edac_dev);