1 files changed, 105 insertions, 0 deletions
diff --git a/arch/s390/hypfs/hypfs_dbfs.c b/arch/s390/hypfs/hypfs_dbfs.c
new file mode 100644
index 000000000..b9bdf5c19
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_dbfs.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hypervisor filesystem for Linux on s390 - debugfs interface
+ *
+ * Copyright IBM Corp. 2010
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <linux/slab.h>
+#include "hypfs.h"
+
+static struct dentry *dbfs_dir;
+
+static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
+{
+	struct hypfs_dbfs_data *data;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return NULL;
+	data->dbfs_file = f;
+	return data;
+}
+
+static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data)
+{
+	data->dbfs_file->data_free(data->buf_free_ptr);
+	kfree(data);
+}
+
+static ssize_t dbfs_read(struct file *file, char __user *buf,
+			 size_t size, loff_t *ppos)
+{
+	struct hypfs_dbfs_data *data;
+	struct hypfs_dbfs_file *df;
+	ssize_t rc;
+
+	if (*ppos != 0)
+		return 0;
+
+	df = file_inode(file)->i_private;
+	mutex_lock(&df->lock);
+	data = hypfs_dbfs_data_alloc(df);
+	if (!data) {
+		mutex_unlock(&df->lock);
+		return -ENOMEM;
+	}
+	rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size);
+	if (rc) {
+		mutex_unlock(&df->lock);
+		kfree(data);
+		return rc;
+	}
+	mutex_unlock(&df->lock);
+
+	rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
+	hypfs_dbfs_data_free(data);
+	return rc;
+}
+
+static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct hypfs_dbfs_file *df = file_inode(file)->i_private;
+	long rc;
+
+	mutex_lock(&df->lock);
+	if (df->unlocked_ioctl)
+		rc = df->unlocked_ioctl(file, cmd, arg);
+	else
+		rc = -ENOTTY;
+	mutex_unlock(&df->lock);
+	return rc;
+}
+
+static const struct file_operations dbfs_ops = {
+	.read		= dbfs_read,
+	.llseek		= no_llseek,
+	.unlocked_ioctl = dbfs_ioctl,
+};
+
+int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
+{
+	df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
+					 &dbfs_ops);
+	if (IS_ERR(df->dentry))
+		return PTR_ERR(df->dentry);
+	mutex_init(&df->lock);
+	return 0;
+}
+
+void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
+{
+	debugfs_remove(df->dentry);
+}
+
+int hypfs_dbfs_init(void)
+{
+	dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
+	return PTR_ERR_OR_ZERO(dbfs_dir);
+}
+
+void hypfs_dbfs_exit(void)
+{
+	debugfs_remove(dbfs_dir);
+}