Merge branch 'devel'
[pandora-kernel.git] / drivers / edac / edac_mc.c
index de5ba86..616d90b 100644 (file)
 #include <linux/list.h>
 #include <linux/ctype.h>
 #include <linux/edac.h>
+#include <linux/bitops.h>
 #include <asm/uaccess.h>
 #include <asm/page.h>
 #include <asm/edac.h>
 #include "edac_core.h"
 #include "edac_module.h"
 
+#define CREATE_TRACE_POINTS
+#define TRACE_INCLUDE_PATH ../../include/ras
+#include <ras/ras_event.h>
+
 /* lock to memory controller's control array */
 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)
 {
-       debugf4("\tchannel = %p\n", chan);
-       debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
-       debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
-       debugf4("\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;
-
-       debugf4("\tdimm = %p\n", dimm);
-       debugf4("\tdimm->label = '%s'\n", dimm->label);
-       debugf4("\tdimm->nr_pages = 0x%x\n", dimm->nr_pages);
-       debugf4("\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");
-       debugf4("\tdimm->grain = %d\n", dimm->grain);
-       debugf4("\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)
 {
-       debugf4("\tcsrow = %p\n", csrow);
-       debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
-       debugf4("\tcsrow->first_page = 0x%lx\n", csrow->first_page);
-       debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page);
-       debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
-       debugf4("\tcsrow->nr_channels = %d\n", csrow->nr_channels);
-       debugf4("\tcsrow->channels = %p\n", csrow->channels);
-       debugf4("\tcsrow->mci = %p\n\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)
 {
-       debugf3("\tmci = %p\n", mci);
-       debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap);
-       debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
-       debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap);
-       debugf4("\tmci->edac_check = %p\n", mci->edac_check);
-       debugf3("\tmci->nr_csrows = %d, csrows = %p\n",
-               mci->nr_csrows, mci->csrows);
-       debugf3("\tmci->nr_dimms = %d, dimms = %p\n",
-               mci->tot_dimms, mci->dimms);
-       debugf3("\tdev = %p\n", mci->dev);
-       debugf3("\tmod_name:ctl_name = %s:%s\n", mci->mod_name, mci->ctl_name);
-       debugf3("\tpvt_info = %p\n\n", mci->pvt_info);
+       edac_dbg(3, "\tmci = %p\n", mci);
+       edac_dbg(3, "\tmci->mtype_cap = %lx\n", mci->mtype_cap);
+       edac_dbg(3, "\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
+       edac_dbg(3, "\tmci->edac_cap = %lx\n", mci->edac_cap);
+       edac_dbg(4, "\tmci->edac_check = %p\n", mci->edac_check);
+       edac_dbg(3, "\tmci->nr_csrows = %d, csrows = %p\n",
+                mci->nr_csrows, mci->csrows);
+       edac_dbg(3, "\tmci->nr_dimms = %d, dimms = %p\n",
+                mci->tot_dimms, mci->dimms);
+       edac_dbg(3, "\tdev = %p\n", mci->pdev);
+       edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n",
+                mci->mod_name, mci->ctl_name);
+       edac_dbg(3, "\tpvt_info = %p\n\n", mci->pvt_info);
 }
 
 #endif                         /* CONFIG_EDAC_DEBUG */
@@ -205,15 +230,15 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
 {
        struct mem_ctl_info *mci;
        struct edac_mc_layer *layer;
-       struct csrow_info *csi, *csr;
-       struct rank_info *chi, *chp, *chan;
+       struct csrow_info *csr;
+       struct rank_info *chan;
        struct dimm_info *dimm;
        u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
        unsigned pos[EDAC_MAX_LAYERS];
        unsigned size, tot_dimms = 1, count = 1;
        unsigned tot_csrows = 1, tot_channels = 1, tot_errcount = 0;
        void *pvt, *p, *ptr = NULL;
-       int i, j, err, row, chn, n, len;
+       int i, j, row, chn, n, len, off;
        bool per_rank = false;
 
        BUG_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0);
@@ -239,26 +264,24 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
         */
        mci = edac_align_ptr(&ptr, sizeof(*mci), 1);
        layer = edac_align_ptr(&ptr, sizeof(*layer), n_layers);
-       csi = edac_align_ptr(&ptr, sizeof(*csi), tot_csrows);
-       chi = edac_align_ptr(&ptr, sizeof(*chi), tot_csrows * tot_channels);
-       dimm = edac_align_ptr(&ptr, sizeof(*dimm), tot_dimms);
        for (i = 0; i < n_layers; i++) {
                count *= layers[i].size;
-               debugf4("%s: errcount layer %d size %d\n", __func__, i, count);
+               edac_dbg(4, "errcount layer %d size %d\n", i, count);
                ce_per_layer[i] = edac_align_ptr(&ptr, sizeof(u32), count);
                ue_per_layer[i] = edac_align_ptr(&ptr, sizeof(u32), count);
                tot_errcount += 2 * count;
        }
 
-       debugf4("%s: allocating %d error counters\n", __func__, tot_errcount);
+       edac_dbg(4, "allocating %d error counters\n", tot_errcount);
        pvt = edac_align_ptr(&ptr, sz_pvt, 1);
        size = ((unsigned long)pvt) + sz_pvt;
 
-       debugf1("%s(): allocating %u bytes for mci data (%d %s, %d csrows/channels)\n",
-               __func__, size,
-               tot_dimms,
-               per_rank ? "ranks" : "dimms",
-               tot_csrows * tot_channels);
+       edac_dbg(1, "allocating %u bytes for mci data (%d %s, %d csrows/channels)\n",
+                size,
+                tot_dimms,
+                per_rank ? "ranks" : "dimms",
+                tot_csrows * tot_channels);
+
        mci = kzalloc(size, GFP_KERNEL);
        if (mci == NULL)
                return NULL;
@@ -267,9 +290,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
         * rather than an imaginary chunk of memory located at address 0.
         */
        layer = (struct edac_mc_layer *)(((char *)mci) + ((unsigned long)layer));
-       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));
        for (i = 0; i < n_layers; i++) {
                mci->ce_per_layer[i] = (u32 *)((char *)mci + ((unsigned long)ce_per_layer[i]));
                mci->ue_per_layer[i] = (u32 *)((char *)mci + ((unsigned long)ue_per_layer[i]));
@@ -278,8 +298,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
 
        /* setup index and various internal pointers */
        mci->mc_idx = mc_num;
-       mci->csrows = csi;
-       mci->dimms  = dimm;
        mci->tot_dimms = tot_dimms;
        mci->pvt_info = pvt;
        mci->n_layers = n_layers;
@@ -290,40 +308,57 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
        mci->mem_is_per_rank = per_rank;
 
        /*
-        * Fill the csrow struct
+        * Alocate and fill the csrow/channels structs
         */
+       mci->csrows = kcalloc(sizeof(*mci->csrows), tot_csrows, GFP_KERNEL);
+       if (!mci->csrows)
+               goto error;
        for (row = 0; row < tot_csrows; row++) {
-               csr = &csi[row];
+               csr = kzalloc(sizeof(**mci->csrows), GFP_KERNEL);
+               if (!csr)
+                       goto error;
+               mci->csrows[row] = csr;
                csr->csrow_idx = row;
                csr->mci = mci;
                csr->nr_channels = tot_channels;
-               chp = &chi[row * tot_channels];
-               csr->channels = chp;
+               csr->channels = kcalloc(sizeof(*csr->channels), tot_channels,
+                                       GFP_KERNEL);
+               if (!csr->channels)
+                       goto error;
 
                for (chn = 0; chn < tot_channels; chn++) {
-                       chan = &chp[chn];
+                       chan = kzalloc(sizeof(**csr->channels), GFP_KERNEL);
+                       if (!chan)
+                               goto error;
+                       csr->channels[chn] = chan;
                        chan->chan_idx = chn;
                        chan->csrow = csr;
                }
        }
 
        /*
-        * Fill the dimm struct
+        * Allocate and fill the dimm structs
         */
+       mci->dimms  = kcalloc(sizeof(*mci->dimms), tot_dimms, GFP_KERNEL);
+       if (!mci->dimms)
+               goto error;
+
        memset(&pos, 0, sizeof(pos));
        row = 0;
        chn = 0;
-       debugf4("%s: initializing %d %s\n", __func__, tot_dimms,
-               per_rank ? "ranks" : "dimms");
        for (i = 0; i < tot_dimms; i++) {
-               chan = &csi[row].channels[chn];
-               dimm = EDAC_DIMM_PTR(layer, mci->dimms, n_layers,
-                              pos[0], pos[1], pos[2]);
-               dimm->mci = mci;
+               chan = mci->csrows[row]->channels[chn];
+               off = EDAC_DIMM_OFF(layer, n_layers, pos[0], pos[1], pos[2]);
+               if (off < 0 || off >= tot_dimms) {
+                       edac_mc_printk(mci, KERN_ERR, "EDAC core bug: EDAC_DIMM_OFF is trying to do an illegal data access\n");
+                       goto error;
+               }
 
-               debugf2("%s: %d: %s%zd (%d:%d:%d): row %d, chan %d\n", __func__,
-                       i, per_rank ? "rank" : "dimm", (dimm - mci->dimms),
-                       pos[0], pos[1], pos[2], row, chn);
+               dimm = kzalloc(sizeof(**mci->dimms), GFP_KERNEL);
+               if (!dimm)
+                       goto error;
+               mci->dimms[off] = dimm;
+               dimm->mci = mci;
 
                /*
                 * Copy DIMM location and initialize it.
@@ -367,16 +402,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
        }
 
        mci->op_state = OP_ALLOC;
-       INIT_LIST_HEAD(&mci->grp_kobj_list);
-
-       /*
-        * Initialize the 'root' kobj for the edac_mc controller
-        */
-       err = edac_mc_register_sysfs_main_kobj(mci);
-       if (err) {
-               kfree(mci);
-               return NULL;
-       }
 
        /* at this point, the root kobj is valid, and in order to
         * 'free' the object, then the function:
@@ -384,7 +409,30 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
         * which will perform kobj unregistration and the actual free
         * will occur during the kobject callback operation
         */
+
        return mci;
+
+error:
+       if (mci->dimms) {
+               for (i = 0; i < tot_dimms; i++)
+                       kfree(mci->dimms[i]);
+               kfree(mci->dimms);
+       }
+       if (mci->csrows) {
+               for (chn = 0; chn < tot_channels; chn++) {
+                       csr = mci->csrows[chn];
+                       if (csr) {
+                               for (chn = 0; chn < tot_channels; chn++)
+                                       kfree(csr->channels[chn]);
+                               kfree(csr);
+                       }
+                       kfree(mci->csrows[i]);
+               }
+               kfree(mci->csrows);
+       }
+       kfree(mci);
+
+       return NULL;
 }
 EXPORT_SYMBOL_GPL(edac_mc_alloc);
 
@@ -395,12 +443,10 @@ EXPORT_SYMBOL_GPL(edac_mc_alloc);
  */
 void edac_mc_free(struct mem_ctl_info *mci)
 {
-       debugf1("%s()\n", __func__);
+       edac_dbg(1, "\n");
 
-       edac_mc_unregister_sysfs_main_kobj(mci);
-
-       /* free the mci instance memory here */
-       kfree(mci);
+       /* the mci instance is freed here, when the sysfs object is dropped */
+       edac_unregister_sysfs(mci);
 }
 EXPORT_SYMBOL_GPL(edac_mc_free);
 
@@ -417,12 +463,12 @@ struct mem_ctl_info *find_mci_by_dev(struct device *dev)
        struct mem_ctl_info *mci;
        struct list_head *item;
 
-       debugf3("%s()\n", __func__);
+       edac_dbg(3, "\n");
 
        list_for_each(item, &mc_devices) {
                mci = list_entry(item, struct mem_ctl_info, link);
 
-               if (mci->dev == dev)
+               if (mci->pdev == dev)
                        return mci;
        }
 
@@ -485,7 +531,7 @@ static void edac_mc_workq_function(struct work_struct *work_req)
  */
 static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec)
 {
-       debugf0("%s()\n", __func__);
+       edac_dbg(0, "\n");
 
        /* if this instance is not in the POLL state, then simply return */
        if (mci->op_state != OP_RUNNING_POLL)
@@ -512,8 +558,7 @@ static void edac_mc_workq_teardown(struct mem_ctl_info *mci)
 
        status = cancel_delayed_work(&mci->work);
        if (status == 0) {
-               debugf0("%s() not canceled, flush the queue\n",
-                       __func__);
+               edac_dbg(0, "not canceled, flush the queue\n");
 
                /* workq instance might be running, wait for it */
                flush_workqueue(edac_workqueue);
@@ -574,7 +619,7 @@ static int add_mc_to_global_list(struct mem_ctl_info *mci)
 
        insert_before = &mc_devices;
 
-       p = find_mci_by_dev(mci->dev);
+       p = find_mci_by_dev(mci->pdev);
        if (unlikely(p != NULL))
                goto fail0;
 
@@ -596,7 +641,7 @@ static int add_mc_to_global_list(struct mem_ctl_info *mci)
 
 fail0:
        edac_printk(KERN_WARNING, EDAC_MC,
-               "%s (%s) %s %s already assigned %d\n", dev_name(p->dev),
+               "%s (%s) %s %s already assigned %d\n", dev_name(p->pdev),
                edac_dev_name(mci), p->mod_name, p->ctl_name, p->mc_idx);
        return 1;
 
@@ -660,7 +705,7 @@ EXPORT_SYMBOL(edac_mc_find);
 /* FIXME - should a warning be printed if no error detection? correction? */
 int edac_mc_add_mc(struct mem_ctl_info *mci)
 {
-       debugf0("%s()\n", __func__);
+       edac_dbg(0, "\n");
 
 #ifdef CONFIG_EDAC_DEBUG
        if (edac_debug_level >= 3)
@@ -670,15 +715,22 @@ 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);
@@ -732,7 +784,7 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev)
 {
        struct mem_ctl_info *mci;
 
-       debugf0("%s()\n", __func__);
+       edac_dbg(0, "\n");
 
        mutex_lock(&mem_ctls_mutex);
 
@@ -770,7 +822,7 @@ static void edac_mc_scrub_block(unsigned long page, unsigned long offset,
        void *virt_addr;
        unsigned long flags = 0;
 
-       debugf3("%s()\n", __func__);
+       edac_dbg(3, "\n");
 
        /* ECC error page was not in our memory. Ignore it. */
        if (!pfn_valid(page))
@@ -797,26 +849,26 @@ static void edac_mc_scrub_block(unsigned long page, unsigned long offset,
 /* FIXME - should return -1 */
 int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
 {
-       struct csrow_info *csrows = mci->csrows;
+       struct csrow_info **csrows = mci->csrows;
        int row, i, j, n;
 
-       debugf1("MC%d: %s(): 0x%lx\n", mci->mc_idx, __func__, page);
+       edac_dbg(1, "MC%d: 0x%lx\n", mci->mc_idx, page);
        row = -1;
 
        for (i = 0; i < mci->nr_csrows; i++) {
-               struct csrow_info *csrow = &csrows[i];
+               struct csrow_info *csrow = csrows[i];
                n = 0;
                for (j = 0; j < csrow->nr_channels; j++) {
-                       struct dimm_info *dimm = csrow->channels[j].dimm;
+                       struct dimm_info *dimm = csrow->channels[j]->dimm;
                        n += dimm->nr_pages;
                }
                if (n == 0)
                        continue;
 
-               debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) "
-                       "mask(0x%lx)\n", mci->mc_idx, __func__,
-                       csrow->first_page, page, csrow->last_page,
-                       csrow->page_mask);
+               edac_dbg(3, "MC%d: first(0x%lx) page(0x%lx) last(0x%lx) mask(0x%lx)\n",
+                        mci->mc_idx,
+                        csrow->first_page, page, csrow->last_page,
+                        csrow->page_mask);
 
                if ((page >= csrow->first_page) &&
                    (page <= csrow->last_page) &&
@@ -845,15 +897,16 @@ const char *edac_layer_name[] = {
 EXPORT_SYMBOL_GPL(edac_layer_name);
 
 static void edac_inc_ce_error(struct mem_ctl_info *mci,
-                                   bool enable_per_layer_report,
-                                   const int pos[EDAC_MAX_LAYERS])
+                             bool enable_per_layer_report,
+                             const int pos[EDAC_MAX_LAYERS],
+                             const u16 count)
 {
        int i, index = 0;
 
-       mci->ce_mc++;
+       mci->ce_mc += count;
 
        if (!enable_per_layer_report) {
-               mci->ce_noinfo_count++;
+               mci->ce_noinfo_count += count;
                return;
        }
 
@@ -861,7 +914,7 @@ static void edac_inc_ce_error(struct mem_ctl_info *mci,
                if (pos[i] < 0)
                        break;
                index += pos[i];
-               mci->ce_per_layer[i][index]++;
+               mci->ce_per_layer[i][index] += count;
 
                if (i < mci->n_layers - 1)
                        index *= mci->layers[i + 1].size;
@@ -870,14 +923,15 @@ static void edac_inc_ce_error(struct mem_ctl_info *mci,
 
 static void edac_inc_ue_error(struct mem_ctl_info *mci,
                                    bool enable_per_layer_report,
-                                   const int pos[EDAC_MAX_LAYERS])
+                                   const int pos[EDAC_MAX_LAYERS],
+                                   const u16 count)
 {
        int i, index = 0;
 
-       mci->ue_mc++;
+       mci->ue_mc += count;
 
        if (!enable_per_layer_report) {
-               mci->ce_noinfo_count++;
+               mci->ce_noinfo_count += count;
                return;
        }
 
@@ -885,7 +939,7 @@ static void edac_inc_ue_error(struct mem_ctl_info *mci,
                if (pos[i] < 0)
                        break;
                index += pos[i];
-               mci->ue_per_layer[i][index]++;
+               mci->ue_per_layer[i][index] += count;
 
                if (i < mci->n_layers - 1)
                        index *= mci->layers[i + 1].size;
@@ -893,6 +947,7 @@ static void edac_inc_ue_error(struct mem_ctl_info *mci,
 }
 
 static void edac_ce_error(struct mem_ctl_info *mci,
+                         const u16 error_count,
                          const int pos[EDAC_MAX_LAYERS],
                          const char *msg,
                          const char *location,
@@ -902,23 +957,25 @@ static void edac_ce_error(struct mem_ctl_info *mci,
                          const bool enable_per_layer_report,
                          const unsigned long page_frame_number,
                          const unsigned long offset_in_page,
-                         u32 grain)
+                         long grain)
 {
        unsigned long remapped_page;
 
        if (edac_mc_get_log_ce()) {
                if (other_detail && *other_detail)
                        edac_mc_printk(mci, KERN_WARNING,
-                                      "CE %s on %s (%s%s - %s)\n",
+                                      "%d CE %s on %s (%s %s - %s)\n",
+                                      error_count,
                                       msg, label, location,
                                       detail, other_detail);
                else
                        edac_mc_printk(mci, KERN_WARNING,
-                                      "CE %s on %s (%s%s)\n",
+                                      "%d CE %s on %s (%s %s)\n",
+                                      error_count,
                                       msg, label, location,
                                       detail);
        }
-       edac_inc_ce_error(mci, enable_per_layer_report, pos);
+       edac_inc_ce_error(mci, enable_per_layer_report, pos, error_count);
 
        if (mci->scrub_mode & SCRUB_SW_SRC) {
                /*
@@ -942,6 +999,7 @@ static void edac_ce_error(struct mem_ctl_info *mci,
 }
 
 static void edac_ue_error(struct mem_ctl_info *mci,
+                         const u16 error_count,
                          const int pos[EDAC_MAX_LAYERS],
                          const char *msg,
                          const char *location,
@@ -953,12 +1011,14 @@ static void edac_ue_error(struct mem_ctl_info *mci,
        if (edac_mc_get_log_ue()) {
                if (other_detail && *other_detail)
                        edac_mc_printk(mci, KERN_WARNING,
-                                      "UE %s on %s (%s%s - %s)\n",
+                                      "%d UE %s on %s (%s %s - %s)\n",
+                                      error_count,
                                       msg, label, location, detail,
                                       other_detail);
                else
                        edac_mc_printk(mci, KERN_WARNING,
-                                      "UE %s on %s (%s%s)\n",
+                                      "%d UE %s on %s (%s %s)\n",
+                                      error_count,
                                       msg, label, location, detail);
        }
 
@@ -971,33 +1031,53 @@ static void edac_ue_error(struct mem_ctl_info *mci,
                              msg, label, location, detail);
        }
 
-       edac_inc_ue_error(mci, enable_per_layer_report, pos);
+       edac_inc_ue_error(mci, enable_per_layer_report, pos, error_count);
 }
 
 #define OTHER_LABEL " or "
+
+/**
+ * edac_mc_handle_error - reports a memory event to userspace
+ *
+ * @type:              severity of the error (CE/UE/Fatal)
+ * @mci:               a struct mem_ctl_info pointer
+ * @error_count:       Number of errors of the same type
+ * @page_frame_number: mem page where the error occurred
+ * @offset_in_page:    offset of the error inside the page
+ * @syndrome:          ECC syndrome
+ * @top_layer:         Memory layer[0] position
+ * @mid_layer:         Memory layer[1] position
+ * @low_layer:         Memory layer[2] position
+ * @msg:               Message meaningful to the end users that
+ *                     explains the event
+ * @other_detail:      Technical details about the event that
+ *                     may help hardware manufacturers and
+ *                     EDAC developers to analyse the event
+ */
 void edac_mc_handle_error(const enum hw_event_mc_err_type type,
                          struct mem_ctl_info *mci,
+                         const u16 error_count,
                          const unsigned long page_frame_number,
                          const unsigned long offset_in_page,
                          const unsigned long syndrome,
-                         const int layer0,
-                         const int layer1,
-                         const int layer2,
+                         const int top_layer,
+                         const int mid_layer,
+                         const int low_layer,
                          const char *msg,
-                         const char *other_detail,
-                         const void *mcelog)
+                         const char *other_detail)
 {
        /* FIXME: too much for stack: move it to some pre-alocated area */
        char detail[80], location[80];
        char label[(EDAC_MC_LABEL_LEN + 1 + sizeof(OTHER_LABEL)) * mci->tot_dimms];
        char *p;
        int row = -1, chan = -1;
-       int pos[EDAC_MAX_LAYERS] = { layer0, layer1, layer2 };
+       int pos[EDAC_MAX_LAYERS] = { top_layer, mid_layer, low_layer };
        int i;
-       u32 grain;
+       long grain;
        bool enable_per_layer_report = false;
+       u8 grain_bits;
 
-       debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
+       edac_dbg(3, "MC%d\n", mci->mc_idx);
 
        /*
         * Check if the event report is consistent and if the memory
@@ -1043,13 +1123,13 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
        p = label;
        *p = '\0';
        for (i = 0; i < mci->tot_dimms; i++) {
-               struct dimm_info *dimm = &mci->dimms[i];
+               struct dimm_info *dimm = mci->dimms[i];
 
-               if (layer0 >= 0 && layer0 != dimm->location[0])
+               if (top_layer >= 0 && top_layer != dimm->location[0])
                        continue;
-               if (layer1 >= 0 && layer1 != dimm->location[1])
+               if (mid_layer >= 0 && mid_layer != dimm->location[1])
                        continue;
-               if (layer2 >= 0 && layer2 != dimm->location[2])
+               if (low_layer >= 0 && low_layer != dimm->location[2])
                        continue;
 
                /* get the max grain, over the error match range */
@@ -1075,11 +1155,9 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
                         * get csrow/channel of the DIMM, in order to allow
                         * incrementing the compat API counters
                         */
-                       debugf4("%s: %s csrows map: (%d,%d)\n",
-                               __func__,
-                               mci->mem_is_per_rank ? "rank" : "dimm",
-                               dimm->csrow, dimm->cschannel);
-
+                       edac_dbg(4, "%s csrows map: (%d,%d)\n",
+                                mci->mem_is_per_rank ? "rank" : "dimm",
+                                dimm->csrow, dimm->cschannel);
                        if (row == -1)
                                row = dimm->csrow;
                        else if (row >= 0 && row != dimm->csrow)
@@ -1095,19 +1173,18 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
        if (!enable_per_layer_report) {
                strcpy(label, "any memory");
        } else {
-               debugf4("%s: csrow/channel to increment: (%d,%d)\n",
-                       __func__, row, chan);
+               edac_dbg(4, "csrow/channel to increment: (%d,%d)\n", row, chan);
                if (p == label)
                        strcpy(label, "unknown memory");
                if (type == HW_EVENT_ERR_CORRECTED) {
                        if (row >= 0) {
-                               mci->csrows[row].ce_count++;
+                               mci->csrows[row]->ce_count += error_count;
                                if (chan >= 0)
-                                       mci->csrows[row].channels[chan].ce_count++;
+                                       mci->csrows[row]->channels[chan]->ce_count += error_count;
                        }
                } else
                        if (row >= 0)
-                               mci->csrows[row].ue_count++;
+                               mci->csrows[row]->ue_count += error_count;
        }
 
        /* Fill the RAM location data */
@@ -1120,23 +1197,33 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
                             edac_layer_name[mci->layers[i].type],
                             pos[i]);
        }
+       if (p > location)
+               *(p - 1) = '\0';
+
+       /* Report the error via the trace interface */
+
+       grain_bits = fls_long(grain) + 1;
+       trace_mc_event(type, msg, label, error_count,
+                      mci->mc_idx, top_layer, mid_layer, low_layer,
+                      PAGES_TO_MiB(page_frame_number) | offset_in_page,
+                      grain_bits, syndrome, other_detail);
 
        /* Memory type dependent details about the error */
        if (type == HW_EVENT_ERR_CORRECTED) {
                snprintf(detail, sizeof(detail),
-                       "page:0x%lx offset:0x%lx grain:%d syndrome:0x%lx",
+                       "page:0x%lx offset:0x%lx grain:%ld syndrome:0x%lx",
                        page_frame_number, offset_in_page,
                        grain, syndrome);
-               edac_ce_error(mci, pos, msg, location, label, detail,
-                             other_detail, enable_per_layer_report,
+               edac_ce_error(mci, error_count, pos, msg, location, label,
+                             detail, other_detail, enable_per_layer_report,
                              page_frame_number, offset_in_page, grain);
        } else {
                snprintf(detail, sizeof(detail),
-                       "page:0x%lx offset:0x%lx grain:%d",
+                       "page:0x%lx offset:0x%lx grain:%ld",
                        page_frame_number, offset_in_page, grain);
 
-               edac_ue_error(mci, pos, msg, location, label, detail,
-                             other_detail, enable_per_layer_report);
+               edac_ue_error(mci, error_count, pos, msg, location, label,
+                             detail, other_detail, enable_per_layer_report);
        }
 }
 EXPORT_SYMBOL_GPL(edac_mc_handle_error);