From 0fdb7f96d8c27e37ed2ca1ae5a763baf14b8fe0c Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Wed, 15 Aug 2007 21:02:23 -0700
Subject: [PATCH] [SPARC64]: Allow userspace to get at the machine description.

Like the OF device tree, it's useful to let userland get
at the machine description so it can pretty print the
graph etc.

The implementation is a simple MISC device with a read method.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 arch/sparc64/kernel/mdesc.c | 38 +++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

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;
-- 
2.20.1