1 files changed, 746 insertions, 0 deletions

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
new file mode 100644
index 000000000000..f3690a697cf9
--- /dev/null
+++ b/drivers/edac/edac_device.c
@@ -0,0 +1,746 @@
+
+/*
+ * edac_device.c
+ * (C) 2007 www.douglaskthompson.com
+ *
+ * This file may be distributed under the terms of the
+ * GNU General Public License.
+ *
+ * Written by Doug Thompson <norsk5@xmission.com>
+ *
+ * edac_device API implementation
+ * 19 Jan 2007
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/highmem.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/sysdev.h>
+#include <linux/ctype.h>
+#include <linux/workqueue.h>
+#include <asm/uaccess.h>
+#include <asm/page.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+/* lock for the list: 'edac_device_list', manipulation of this list
+ * is protected by the 'device_ctls_mutex' lock
+ */
+static DEFINE_MUTEX(device_ctls_mutex);
+static struct list_head edac_device_list = LIST_HEAD_INIT(edac_device_list);
+
+#ifdef CONFIG_EDAC_DEBUG
+static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
+{
+        debugf3("\tedac_dev = %p dev_idx=%d \n", edac_dev, edac_dev->dev_idx);
+        debugf4("\tedac_dev->edac_check = %p\n", edac_dev->edac_check);
+        debugf3("\tdev = %p\n", edac_dev->dev);
+        debugf3("\tmod_name:ctl_name = %s:%s\n",
+                edac_dev->mod_name, edac_dev->ctl_name);
+        debugf3("\tpvt_info = %p\n\n", edac_dev->pvt_info);
+}
+#endif                          /* CONFIG_EDAC_DEBUG */
+
+
+/*
+ * edac_device_alloc_ctl_info()
+ *      Allocate a new edac device control info structure
+ *
+ *      The control structure is allocated in complete chunk
+ *      from the OS. It is in turn sub allocated to the
+ *      various objects that compose the struture
+ *
+ *      The structure has a 'nr_instance' array within itself.
+ *      Each instance represents a major component
+ *              Example:  L1 cache and L2 cache are 2 instance components
+ *
+ *      Within each instance is an array of 'nr_blocks' blockoffsets
+ */
+struct edac_device_ctl_info *edac_device_alloc_ctl_info(
+        unsigned sz_private,
+        char *edac_device_name, unsigned nr_instances,
+        char *edac_block_name, unsigned nr_blocks,
+        unsigned offset_value,          /* zero, 1, or other based offset */
+        struct edac_dev_sysfs_block_attribute *attrib_spec, unsigned nr_attrib,
+        int device_index)
+{
+        struct edac_device_ctl_info *dev_ctl;
+        struct edac_device_instance *dev_inst, *inst;
+        struct edac_device_block *dev_blk, *blk_p, *blk;
+        struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
+        unsigned total_size;
+        unsigned count;
+        unsigned instance, block, attr;
+        void *pvt;
+        int err;
+
+        debugf4("%s() instances=%d blocks=%d\n",
+                __func__, nr_instances, nr_blocks);
+
+        /* Calculate the size of memory we need to allocate AND
+         * determine the offsets of the various item arrays
+         * (instance,block,attrib) from the start of an  allocated structure.
+         * We want the alignment of each item  (instance,block,attrib)
+         * to be at least as stringent as what the compiler would
+         * provide if we could simply hardcode everything into a single struct.
+         */
+        dev_ctl = (struct edac_device_ctl_info *)NULL;
+
+        /* Calc the 'end' offset past end of ONE ctl_info structure
+         * which will become the start of the 'instance' array
+         */
+        dev_inst = edac_align_ptr(&dev_ctl[1], sizeof(*dev_inst));
+
+        /* Calc the 'end' offset past the instance array within the ctl_info
+         * which will become the start of the block array
+         */
+        dev_blk = edac_align_ptr(&dev_inst[nr_instances], sizeof(*dev_blk));
+
+        /* Calc the 'end' offset past the dev_blk array
+         * which will become the start of the attrib array, if any.
+         */
+        count = nr_instances * nr_blocks;
+        dev_attrib = edac_align_ptr(&dev_blk[count], sizeof(*dev_attrib));
+
+        /* Check for case of when an attribute array is specified */
+        if (nr_attrib > 0) {
+                /* calc how many nr_attrib we need */
+                count *= nr_attrib;
+
+                /* Calc the 'end' offset past the attributes array */
+                pvt = edac_align_ptr(&dev_attrib[count], sz_private);
+        } else {
+                /* no attribute array specificed */
+                pvt = edac_align_ptr(dev_attrib, sz_private);
+        }
+
+        /* 'pvt' now points to where the private data area is.
+         * At this point 'pvt' (like dev_inst,dev_blk and dev_attrib)
+         * is baselined at ZERO
+         */
+        total_size = ((unsigned long)pvt) + sz_private;
+
+        /* Allocate the amount of memory for the set of control structures */
+        dev_ctl = kzalloc(total_size, GFP_KERNEL);
+        if (dev_ctl == NULL)
+                return NULL;
+
+        /* Adjust pointers so they point within the actual memory we
+         * just allocated rather than an imaginary chunk of memory
+         * located at address 0.
+         * 'dev_ctl' points to REAL memory, while the others are
+         * ZERO based and thus need to be adjusted to point within
+         * the allocated memory.
+         */
+        dev_inst = (struct edac_device_instance *)
+                (((char *)dev_ctl) + ((unsigned long)dev_inst));
+        dev_blk = (struct edac_device_block *)
+                (((char *)dev_ctl) + ((unsigned long)dev_blk));
+        dev_attrib = (struct edac_dev_sysfs_block_attribute *)
+                (((char *)dev_ctl) + ((unsigned long)dev_attrib));
+        pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL;
+
+        /* Begin storing the information into the control info structure */
+        dev_ctl->dev_idx = device_index;
+        dev_ctl->nr_instances = nr_instances;
+        dev_ctl->instances = dev_inst;
+        dev_ctl->pvt_info = pvt;
+
+        /* Name of this edac device */
+        snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name);
+
+        debugf4("%s() edac_dev=%p next after end=%p\n",
+                __func__, dev_ctl, pvt + sz_private );
+
+        /* Initialize every Instance */
+        for (instance = 0; instance < nr_instances; instance++) {
+                inst = &dev_inst[instance];
+                inst->ctl = dev_ctl;
+                inst->nr_blocks = nr_blocks;
+                blk_p = &dev_blk[instance * nr_blocks];
+                inst->blocks = blk_p;
+
+                /* name of this instance */
+                snprintf(inst->name, sizeof(inst->name),
+                         "%s%u", edac_device_name, instance);
+
+                /* Initialize every block in each instance */
+                for (block = 0; block < nr_blocks; block++) {
+                        blk = &blk_p[block];
+                        blk->instance = inst;
+                        snprintf(blk->name, sizeof(blk->name),
+                                 "%s%d", edac_block_name, block+offset_value);
+
+                        debugf4("%s() instance=%d inst_p=%p block=#%d "
+                                "block_p=%p name='%s'\n",
+                                __func__, instance, inst, block,
+                                blk, blk->name);
+
+                        /* if there are NO attributes OR no attribute pointer
+                         * then continue on to next block iteration
+                         */
+                        if ((nr_attrib == 0) || (attrib_spec == NULL))
+                                continue;
+
+                        /* setup the attribute array for this block */
+                        blk->nr_attribs = nr_attrib;
+                        attrib_p = &dev_attrib[block*nr_instances*nr_attrib];
+                        blk->block_attributes = attrib_p;
+
+                        debugf4("%s() THIS BLOCK_ATTRIB=%p\n",
+                                __func__, blk->block_attributes);
+
+                        /* Initialize every user specified attribute in this
+                         * block with the data the caller passed in
+                         * Each block gets its own copy of pointers,
+                         * and its unique 'value'
+                         */
+                        for (attr = 0; attr < nr_attrib; attr++) {
+                                attrib = &attrib_p[attr];
+
+                                /* populate the unique per attrib
+                                 * with the code pointers and info
+                                 */
+                                attrib->attr = attrib_spec[attr].attr;
+                                attrib->show = attrib_spec[attr].show;
+                                attrib->store = attrib_spec[attr].store;
+
+                                attrib->block = blk;    /* up link */
+
+                                debugf4("%s() alloc-attrib=%p attrib_name='%s' "
+                                        "attrib-spec=%p spec-name=%s\n",
+                                        __func__, attrib, attrib->attr.name,
+                                        &attrib_spec[attr],
+                                        attrib_spec[attr].attr.name
+                                        );
+                        }
+                }
+        }
+
+        /* Mark this instance as merely ALLOCATED */
+        dev_ctl->op_state = OP_ALLOC;
+
+        /*
+         * Initialize the 'root' kobj for the edac_device controller
+         */
+        err = edac_device_register_sysfs_main_kobj(dev_ctl);
+        if (err) {
+                kfree(dev_ctl);
+                return NULL;
+        }
+
+        /* at this point, the root kobj is valid, and in order to
+         * 'free' the object, then the function:
+         *      edac_device_unregister_sysfs_main_kobj() must be called
+         * which will perform kobj unregistration and the actual free
+         * will occur during the kobject callback operation
+         */
+
+        return dev_ctl;
+}
+EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
+
+/*
+ * edac_device_free_ctl_info()
+ *      frees the memory allocated by the edac_device_alloc_ctl_info()
+ *      function
+ */
+void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
+{
+        edac_device_unregister_sysfs_main_kobj(ctl_info);
+}
+EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
+
+/*
+ * find_edac_device_by_dev
+ *      scans the edac_device list for a specific 'struct device *'
+ *
+ *      lock to be held prior to call:  device_ctls_mutex
+ *
+ *      Return:
+ *              pointer to control structure managing 'dev'
+ *              NULL if not found on list
+ */
+static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev)
+{
+        struct edac_device_ctl_info *edac_dev;
+        struct list_head *item;
+
+        debugf0("%s()\n", __func__);
+
+        list_for_each(item, &edac_device_list) {
+                edac_dev = list_entry(item, struct edac_device_ctl_info, link);
+
+                if (edac_dev->dev == dev)
+                        return edac_dev;
+        }
+
+        return NULL;
+}
+
+/*
+ * add_edac_dev_to_global_list
+ *      Before calling this function, caller must
+ *      assign a unique value to edac_dev->dev_idx.
+ *
+ *      lock to be held prior to call:  device_ctls_mutex
+ *
+ *      Return:
+ *              0 on success
+ *              1 on failure.
+ */
+static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev)
+{
+        struct list_head *item, *insert_before;
+        struct edac_device_ctl_info *rover;
+
+        insert_before = &edac_device_list;
+
+        /* Determine if already on the list */
+        rover = find_edac_device_by_dev(edac_dev->dev);
+        if (unlikely(rover != NULL))
+                goto fail0;
+
+        /* Insert in ascending order by 'dev_idx', so find position */
+        list_for_each(item, &edac_device_list) {
+                rover = list_entry(item, struct edac_device_ctl_info, link);
+
+                if (rover->dev_idx >= edac_dev->dev_idx) {
+                        if (unlikely(rover->dev_idx == edac_dev->dev_idx))
+                                goto fail1;
+
+                        insert_before = item;
+                        break;
+                }
+        }
+
+        list_add_tail_rcu(&edac_dev->link, insert_before);
+        return 0;
+
+fail0:
+        edac_printk(KERN_WARNING, EDAC_MC,
+                        "%s (%s) %s %s already assigned %d\n",
+                        rover->dev->bus_id, dev_name(rover),
+                        rover->mod_name, rover->ctl_name, rover->dev_idx);
+        return 1;
+
+fail1:
+        edac_printk(KERN_WARNING, EDAC_MC,
+                        "bug in low-level driver: attempt to assign\n"
+                        "    duplicate dev_idx %d in %s()\n", rover->dev_idx,
+                        __func__);
+        return 1;
+}
+
+/*
+ * complete_edac_device_list_del
+ *
+ *      callback function when reference count is zero
+ */
+static void complete_edac_device_list_del(struct rcu_head *head)
+{
+        struct edac_device_ctl_info *edac_dev;
+
+        edac_dev = container_of(head, struct edac_device_ctl_info, rcu);
+        INIT_LIST_HEAD(&edac_dev->link);
+        complete(&edac_dev->removal_complete);
+}
+
+/*
+ * del_edac_device_from_global_list
+ *
+ *      remove the RCU, setup for a callback call,
+ *      then wait for the callback to occur
+ */
+static void del_edac_device_from_global_list(struct edac_device_ctl_info
+                                                *edac_device)
+{
+        list_del_rcu(&edac_device->link);
+
+        init_completion(&edac_device->removal_complete);
+        call_rcu(&edac_device->rcu, complete_edac_device_list_del);
+        wait_for_completion(&edac_device->removal_complete);
+}
+
+/**
+ * edac_device_find
+ *      Search for a edac_device_ctl_info structure whose index is 'idx'.
+ *
+ * If found, return a pointer to the structure.
+ * Else return NULL.
+ *
+ * Caller must hold device_ctls_mutex.
+ */
+struct edac_device_ctl_info *edac_device_find(int idx)
+{
+        struct list_head *item;
+        struct edac_device_ctl_info *edac_dev;
+
+        /* Iterate over list, looking for exact match of ID */
+        list_for_each(item, &edac_device_list) {
+                edac_dev = list_entry(item, struct edac_device_ctl_info, link);
+
+                if (edac_dev->dev_idx >= idx) {
+                        if (edac_dev->dev_idx == idx)
+                                return edac_dev;
+
+                        /* not on list, so terminate early */
+                        break;
+                }
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(edac_device_find);
+
+/*
+ * edac_device_workq_function
+ *      performs the operation scheduled by a workq request
+ *
+ *      this workq is embedded within an edac_device_ctl_info
+ *      structure, that needs to be polled for possible error events.
+ *
+ *      This operation is to acquire the list mutex lock
+ *      (thus preventing insertation or deletion)
+ *      and then call the device's poll function IFF this device is
+ *      running polled and there is a poll function defined.
+ */
+static void edac_device_workq_function(struct work_struct *work_req)
+{
+        struct delayed_work *d_work = (struct delayed_work *)work_req;
+        struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work);
+
+        mutex_lock(&device_ctls_mutex);
+
+        /* Only poll controllers that are running polled and have a check */
+        if ((edac_dev->op_state == OP_RUNNING_POLL) &&
+                (edac_dev->edac_check != NULL)) {
+                        edac_dev->edac_check(edac_dev);
+        }
+
+        mutex_unlock(&device_ctls_mutex);
+
+        /* Reschedule the workq for the next time period to start again
+         * if the number of msec is for 1 sec, then adjust to the next
+         * whole one second to save timers fireing all over the period
+         * between integral seconds
+         */
+        if (edac_dev->poll_msec == 1000)
+                queue_delayed_work(edac_workqueue, &edac_dev->work,
+                                round_jiffies(edac_dev->delay));
+        else
+                queue_delayed_work(edac_workqueue, &edac_dev->work,
+                                edac_dev->delay);
+}
+
+/*
+ * edac_device_workq_setup
+ *      initialize a workq item for this edac_device instance
+ *      passing in the new delay period in msec
+ */
+void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
+                                unsigned msec)
+{
+        debugf0("%s()\n", __func__);
+
+        /* take the arg 'msec' and set it into the control structure
+         * to used in the time period calculation
+         * then calc the number of jiffies that represents
+         */
+        edac_dev->poll_msec = msec;
+        edac_dev->delay = msecs_to_jiffies(msec);
+
+        INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
+
+        /* optimize here for the 1 second case, which will be normal value, to
+         * fire ON the 1 second time event. This helps reduce all sorts of
+         * timers firing on sub-second basis, while they are happy
+         * to fire together on the 1 second exactly
+         */
+        if (edac_dev->poll_msec == 1000)
+                queue_delayed_work(edac_workqueue, &edac_dev->work,
+                                round_jiffies(edac_dev->delay));
+        else
+                queue_delayed_work(edac_workqueue, &edac_dev->work,
+                                edac_dev->delay);
+}
+
+/*
+ * edac_device_workq_teardown
+ *      stop the workq processing on this edac_dev
+ */
+void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
+{
+        int status;
+
+        status = cancel_delayed_work(&edac_dev->work);
+        if (status == 0) {
+                /* workq instance might be running, wait for it */
+                flush_workqueue(edac_workqueue);
+        }
+}
+
+/*
+ * edac_device_reset_delay_period
+ *
+ *      need to stop any outstanding workq queued up at this time
+ *      because we will be resetting the sleep time.
+ *      Then restart the workq on the new delay
+ */
+void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev,
+                                        unsigned long value)
+{
+        /* cancel the current workq request, without the mutex lock */
+        edac_device_workq_teardown(edac_dev);
+
+        /* acquire the mutex before doing the workq setup */
+        mutex_lock(&device_ctls_mutex);
+
+        /* restart the workq request, with new delay value */
+        edac_device_workq_setup(edac_dev, value);
+
+        mutex_unlock(&device_ctls_mutex);
+}
+
+/**
+ * edac_device_add_device: Insert the 'edac_dev' structure into the
+ * edac_device global list and create sysfs entries associated with
+ * edac_device structure.
+ * @edac_device: pointer to the edac_device structure to be added to the list
+ * 'edac_device' structure.
+ *
+ * Return:
+ *      0       Success
+ *      !0      Failure
+ */
+int edac_device_add_device(struct edac_device_ctl_info *edac_dev)
+{
+        debugf0("%s()\n", __func__);
+
+#ifdef CONFIG_EDAC_DEBUG
+        if (edac_debug_level >= 3)
+                edac_device_dump_device(edac_dev);
+#endif
+        mutex_lock(&device_ctls_mutex);
+
+        if (add_edac_dev_to_global_list(edac_dev))
+                goto fail0;
+
+        /* set load time so that error rate can be tracked */
+        edac_dev->start_time = jiffies;
+
+        /* create this instance's sysfs entries */
+        if (edac_device_create_sysfs(edac_dev)) {
+                edac_device_printk(edac_dev, KERN_WARNING,
+                                        "failed to create sysfs device\n");
+                goto fail1;
+        }
+
+        /* If there IS a check routine, then we are running POLLED */
+        if (edac_dev->edac_check != NULL) {
+                /* This instance is NOW RUNNING */
+                edac_dev->op_state = OP_RUNNING_POLL;
+
+                /*
+                 * enable workq processing on this instance,
+                 * default = 1000 msec
+                 */
+                edac_device_workq_setup(edac_dev, 1000);
+        } else {
+                edac_dev->op_state = OP_RUNNING_INTERRUPT;
+        }
+
+        /* Report action taken */
+        edac_device_printk(edac_dev, KERN_INFO,
+                                "Giving out device to module '%s' controller "
+                                "'%s': DEV '%s' (%s)\n",
+                                edac_dev->mod_name,
+                                edac_dev->ctl_name,
+                                dev_name(edac_dev),
+                                edac_op_state_to_string(edac_dev->op_state));
+
+        mutex_unlock(&device_ctls_mutex);
+        return 0;
+
+fail1:
+        /* Some error, so remove the entry from the lsit */
+        del_edac_device_from_global_list(edac_dev);
+
+fail0:
+        mutex_unlock(&device_ctls_mutex);
+        return 1;
+}
+EXPORT_SYMBOL_GPL(edac_device_add_device);
+
+/**
+ * edac_device_del_device:
+ *      Remove sysfs entries for specified edac_device structure and
+ *      then remove edac_device structure from global list
+ *
+ * @pdev:
+ *      Pointer to 'struct device' representing edac_device
+ *      structure to remove.
+ *
+ * Return:
+ *      Pointer to removed edac_device structure,
+ *      OR NULL if device not found.
+ */
+struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
+{
+        struct edac_device_ctl_info *edac_dev;
+
+        debugf0("%s()\n", __func__);
+
+        mutex_lock(&device_ctls_mutex);
+
+        /* Find the structure on the list, if not there, then leave */
+        edac_dev = find_edac_device_by_dev(dev);
+        if (edac_dev == NULL) {
+                mutex_unlock(&device_ctls_mutex);
+                return NULL;
+        }
+
+        /* mark this instance as OFFLINE */
+        edac_dev->op_state = OP_OFFLINE;
+
+        /* clear workq processing on this instance */
+        edac_device_workq_teardown(edac_dev);
+
+        /* deregister from global list */
+        del_edac_device_from_global_list(edac_dev);
+
+        mutex_unlock(&device_ctls_mutex);
+
+        /* Tear down the sysfs entries for this instance */
+        edac_device_remove_sysfs(edac_dev);
+
+        edac_printk(KERN_INFO, EDAC_MC,
+                "Removed device %d for %s %s: DEV %s\n",
+                edac_dev->dev_idx,
+                edac_dev->mod_name, edac_dev->ctl_name, dev_name(edac_dev));
+
+        return edac_dev;
+}
+EXPORT_SYMBOL_GPL(edac_device_del_device);
+
+static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
+{
+        return edac_dev->log_ce;
+}
+
+static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev)
+{
+        return edac_dev->log_ue;
+}
+
+static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info
+                                        *edac_dev)
+{
+        return edac_dev->panic_on_ue;
+}
+
+/*
+ * edac_device_handle_ce
+ *      perform a common output and handling of an 'edac_dev' CE event
+ */
+void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
+                        int inst_nr, int block_nr, const char *msg)
+{
+        struct edac_device_instance *instance;
+        struct edac_device_block *block = NULL;
+
+        if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
+                edac_device_printk(edac_dev, KERN_ERR,
+                                "INTERNAL ERROR: 'instance' out of range "
+                                "(%d >= %d)\n", inst_nr,
+                                edac_dev->nr_instances);
+                return;
+        }
+
+        instance = edac_dev->instances + inst_nr;
+
+        if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
+                edac_device_printk(edac_dev, KERN_ERR,
+                                "INTERNAL ERROR: instance %d 'block' "
+                                "out of range (%d >= %d)\n",
+                                inst_nr, block_nr,
+                                instance->nr_blocks);
+                return;
+        }
+
+        if (instance->nr_blocks > 0) {
+                block = instance->blocks + block_nr;
+                block->counters.ce_count++;
+        }
+
+        /* Propogate the count up the 'totals' tree */
+        instance->counters.ce_count++;
+        edac_dev->counters.ce_count++;
+
+        if (edac_device_get_log_ce(edac_dev))
+                edac_device_printk(edac_dev, KERN_WARNING,
+                                "CE: %s instance: %s block: %s '%s'\n",
+                                edac_dev->ctl_name, instance->name,
+                                block ? block->name : "N/A", msg);
+}
+EXPORT_SYMBOL_GPL(edac_device_handle_ce);
+
+/*
+ * edac_device_handle_ue
+ *      perform a common output and handling of an 'edac_dev' UE event
+ */
+void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
+                        int inst_nr, int block_nr, const char *msg)
+{
+        struct edac_device_instance *instance;
+        struct edac_device_block *block = NULL;
+
+        if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) {
+                edac_device_printk(edac_dev, KERN_ERR,
+                                "INTERNAL ERROR: 'instance' out of range "
+                                "(%d >= %d)\n", inst_nr,
+                                edac_dev->nr_instances);
+                return;
+        }
+
+        instance = edac_dev->instances + inst_nr;
+
+        if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) {
+                edac_device_printk(edac_dev, KERN_ERR,
+                                "INTERNAL ERROR: instance %d 'block' "
+                                "out of range (%d >= %d)\n",
+                                inst_nr, block_nr,
+                                instance->nr_blocks);
+                return;
+        }
+
+        if (instance->nr_blocks > 0) {
+                block = instance->blocks + block_nr;
+                block->counters.ue_count++;
+        }
+
+        /* Propogate the count up the 'totals' tree */
+        instance->counters.ue_count++;
+        edac_dev->counters.ue_count++;
+
+        if (edac_device_get_log_ue(edac_dev))
+                edac_device_printk(edac_dev, KERN_EMERG,
+                                "UE: %s instance: %s block: %s '%s'\n",
+                                edac_dev->ctl_name, instance->name,
+                                block ? block->name : "N/A", msg);
+
+        if (edac_device_get_panic_on_ue(edac_dev))
+                panic("EDAC %s: UE instance: %s block %s '%s'\n",
+                        edac_dev->ctl_name, instance->name,
+                        block ? block->name : "N/A", msg);
+}
+EXPORT_SYMBOL_GPL(edac_device_handle_ue);