1 files changed, 38 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index c0d8c2006bf4..f0f2199e64e1 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -182,6 +182,41 @@ static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL);
 static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
 static SYSDEV_ATTR(purr, 0600, show_purr, store_purr);
+
+unsigned long dscr_default = 0;
+EXPORT_SYMBOL(dscr_default);
+
+static ssize_t show_dscr_default(struct sysdev_class *class,
+                struct sysdev_class_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%lx\n", dscr_default);
+}
+
+static ssize_t __used store_dscr_default(struct sysdev_class *class,
+                struct sysdev_class_attribute *attr, const char *buf,
+                size_t count)
+{
+        unsigned long val;
+        int ret = 0;
+        
+        ret = sscanf(buf, "%lx", &val);
+        if (ret != 1)
+                return -EINVAL;
+        dscr_default = val;
+
+        return count;
+}
+
+static SYSDEV_CLASS_ATTR(dscr_default, 0600,
+                show_dscr_default, store_dscr_default);
+
+static void sysfs_create_dscr_default(void)
+{
+        int err = 0;
+        if (cpu_has_feature(CPU_FTR_DSCR))
+                err = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+                        &attr_dscr_default.attr);
+}
 #endif /* CONFIG_PPC64 */
 
 #ifdef HAS_PPC_PMC_PA6T
@@ -617,6 +652,9 @@ static int __init topology_init(void)
                 if (cpu_online(cpu))
                         register_cpu_online(cpu);
         }
+#ifdef CONFIG_PPC64
+        sysfs_create_dscr_default();
+#endif /* CONFIG_PPC64 */
 
         return 0;
 }