1 files changed, 51 insertions, 1 deletions

diff --git a/arch/ia64/sn/kernel/sn2/sn_proc_fs.c b/arch/ia64/sn/kernel/sn2/sn_proc_fs.c
index 60eefbac4a21eb..e7a8987b672d2c 100644
--- a/arch/ia64/sn/kernel/sn2/sn_proc_fs.c
+++ b/arch/ia64/sn/kernel/sn2/sn_proc_fs.c
@@ -31,6 +31,7 @@
  * http://oss.sgi.com/projects/GenInfo/NoticeExplan
  */
 #include <linux/config.h>
+#include <asm/uaccess.h>
 
 #ifdef CONFIG_PROC_FS
 #include <linux/proc_fs.h>
@@ -43,7 +44,7 @@ static int partition_id_read_proc(char *page, char **start, off_t off,
 	return sprintf(page, "%d\n", sn_local_partid());
 }
 
-struct proc_dir_entry * sgi_proc_dir = NULL;
+static struct proc_dir_entry * sgi_proc_dir;
 
 void
 register_sn_partition_id(void) {
@@ -135,11 +136,60 @@ register_sn_force_interrupt(void) {
 		entry->write_proc = sn_force_interrupt_write_proc;
 	}
 }
+
+extern int sn_linkstats_get(char *);
+extern int sn_linkstats_reset(unsigned long);
+
+static int
+sn_linkstats_read_proc(char *page, char **start, off_t off,
+		int count, int *eof, void *data) {
+       
+	return sn_linkstats_get(page);
+}
+
+static int 
+sn_linkstats_write_proc(struct file *file, const char *buffer,
+                                        unsigned long count, void *data)
+{
+	char		s[64];
+	unsigned long	msecs;
+	int		e = count;
+
+	if (copy_from_user(s, buffer, count < sizeof(s) ? count : sizeof(s)))
+		e = -EFAULT;
+	else {
+		if (sscanf(s, "%lu", &msecs) != 1 || msecs < 5)
+			/* at least 5 milliseconds between updates */
+			e = -EINVAL;
+		else
+			sn_linkstats_reset(msecs);
+	}
+
+	return e;
+}
+
+void
+register_sn_linkstats(void) {
+	struct proc_dir_entry *entry;
+
+	if (!sgi_proc_dir) {
+		sgi_proc_dir = proc_mkdir("sgi_sn", 0);
+	}
+	entry = create_proc_entry("linkstats", 0444, sgi_proc_dir);
+	if (entry) {
+		entry->nlink = 1;
+		entry->data = 0;
+		entry->read_proc = sn_linkstats_read_proc;
+		entry->write_proc = sn_linkstats_write_proc;
+	}
+}
+
 void
 register_sn_procfs(void) {
 	register_sn_partition_id();
 	register_sn_serial_numbers();
 	register_sn_force_interrupt();
+	register_sn_linkstats();
 }
 
 #endif /* CONFIG_PROC_FS */