1 files changed, 38 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/mdesc.c b/arch/sparc64/kernel/mdesc.c
index 95059c2ec414..9f22e4ff6015 100644
--- a/arch/sparc64/kernel/mdesc.c
+++ b/arch/sparc64/kernel/mdesc.c
@@ -9,6 +9,7 @@
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
+#include <linux/miscdevice.h>
 
 #include <asm/hypervisor.h>
 #include <asm/mdesc.h>
@@ -836,6 +837,43 @@ void __devinit mdesc_fill_in_cpu_data(cpumask_t mask)
         mdesc_release(hp);
 }
 
+static ssize_t mdesc_read(struct file *file, char __user *buf,
+                          size_t len, loff_t *offp)
+{
+        struct mdesc_handle *hp = mdesc_grab();
+        int err;
+
+        if (!hp)
+                return -ENODEV;
+
+        err = hp->handle_size;
+        if (len < hp->handle_size)
+                err = -EMSGSIZE;
+        else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
+                err = -EFAULT;
+        mdesc_release(hp);
+
+        return err;
+}
+
+static const struct file_operations mdesc_fops = {
+        .read   = mdesc_read,
+        .owner  = THIS_MODULE,
+};
+
+static struct miscdevice mdesc_misc = {
+        .minor  = MISC_DYNAMIC_MINOR,
+        .name   = "mdesc",
+        .fops   = &mdesc_fops,
+};
+
+static int __init mdesc_misc_init(void)
+{
+        return misc_register(&mdesc_misc);
+}
+
+__initcall(mdesc_misc_init);
+
 void __init sun4v_mdesc_init(void)
 {
         struct mdesc_handle *hp;