summaryrefslogtreecommitdiff
path: root/arch/sparc64/kernel/mdesc.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc64/kernel/mdesc.c')
-rw-r--r--arch/sparc64/kernel/mdesc.c38
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;