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.

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 51e7b225ed000d13476b5399bca50e93a84c9028..91029c0cfa545f7858c768f3d81360fa56e5db1e 100644 (file)
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -742,6 +742,23 @@ 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);
 
@@ -753,6 +770,7 @@ 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,
@@ -768,6 +786,7 @@ 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
 };