Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / ras / debugfs.c

diff --git a/kernel/drivers/ras/debugfs.c b/kernel/drivers/ras/debugfs.c
new file mode 100644 (file)
index 0000000..0322acf
--- /dev/null
+++ b/kernel/drivers/ras/debugfs.c
@@ -0,0 +1,56 @@
+#include <linux/debugfs.h>
+
+static struct dentry *ras_debugfs_dir;
+
+static atomic_t trace_count = ATOMIC_INIT(0);
+
+int ras_userspace_consumers(void)
+{
+       return atomic_read(&trace_count);
+}
+EXPORT_SYMBOL_GPL(ras_userspace_consumers);
+
+static int trace_show(struct seq_file *m, void *v)
+{
+       return atomic_read(&trace_count);
+}
+
+static int trace_open(struct inode *inode, struct file *file)
+{
+       atomic_inc(&trace_count);
+       return single_open(file, trace_show, NULL);
+}
+
+static int trace_release(struct inode *inode, struct file *file)
+{
+       atomic_dec(&trace_count);
+       return single_release(inode, file);
+}
+
+static const struct file_operations trace_fops = {
+       .open    = trace_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = trace_release,
+};
+
+int __init ras_add_daemon_trace(void)
+{
+       struct dentry *fentry;
+
+       if (!ras_debugfs_dir)
+               return -ENOENT;
+
+       fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
+                                    NULL, &trace_fops);
+       if (!fentry)
+               return -ENODEV;
+
+       return 0;
+
+}
+
+void __init ras_debugfs_init(void)
+{
+       ras_debugfs_dir = debugfs_create_dir("ras", NULL);
+}