edac: add a sysfs node to report the maximum location for the system

The userspace tools need to know what's the maximum location on each
system, as it helps to create nice maps showing how the memory was
filled at the system.

Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 84f379b1aba4bc0763ab9142ae501a47a5cc0b38..8ff7f3146d2735b2042d7fe22e54f099d03c5c12 100644 (file)
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -766,6 +766,23 @@ static ssize_t mci_size_mb_show(struct device *dev,
        return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 }
 
+static ssize_t mci_max_location_show(struct device *dev,
+                                    struct device_attribute *mattr,
+                                    char *data)
+{
+       struct mem_ctl_info *mci = to_mci(dev);
+       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],
+                            mci->layers[i].size - 1);
+       }
+
+       return p - data;
+}
+
 /* default Control file */
 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 
@@ -777,6 +794,7 @@ DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
+DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 
 /* memory scrubber attribute file */
 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
@@ -792,6 +810,7 @@ static struct attribute *mci_attrs[] = {
        &dev_attr_ue_count.attr,
        &dev_attr_ce_count.attr,
        &dev_attr_sdram_scrub_rate.attr,
+       &dev_attr_max_location.attr,
        NULL
 };