1 files changed, 37 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index aa316d820736..f10b9ec8c1f5 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -9,8 +9,9 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#undef DEBUG
+#define pr_fmt(fmt)     "opal: " fmt
 
+#include <linux/printk.h>
 #include <linux/types.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -625,6 +626,39 @@ static int opal_sysfs_init(void)
         return 0;
 }
 
+static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
+                               struct bin_attribute *bin_attr,
+                               char *buf, loff_t off, size_t count)
+{
+        return memory_read_from_buffer(buf, count, &off, bin_attr->private,
+                                       bin_attr->size);
+}
+
+static BIN_ATTR_RO(symbol_map, 0);
+
+static void opal_export_symmap(void)
+{
+        const __be64 *syms;
+        unsigned int size;
+        struct device_node *fw;
+        int rc;
+
+        fw = of_find_node_by_path("/ibm,opal/firmware");
+        if (!fw)
+                return;
+        syms = of_get_property(fw, "symbol-map", &size);
+        if (!syms || size != 2 * sizeof(__be64))
+                return;
+
+        /* Setup attributes */
+        bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
+        bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
+
+        rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
+        if (rc)
+                pr_warn("Error %d creating OPAL symbols file\n", rc);
+}
+
 static void __init opal_dump_region_init(void)
 {
         void *addr;
@@ -713,6 +747,8 @@ static int __init opal_init(void)
         /* Create "opal" kobject under /sys/firmware */
         rc = opal_sysfs_init();
         if (rc == 0) {
+                /* Export symbol map to userspace */
+                opal_export_symmap();
                 /* Setup dump region interface */
                 opal_dump_region_init();
                 /* Setup error log interface */