1 files changed, 63 insertions, 0 deletions
diff --git a/arch/s390/kernel/diag/diag_misc.c b/arch/s390/kernel/diag/diag_misc.c
new file mode 100644
index 000000000000..efffe02ea02e
--- /dev/null
+++ b/arch/s390/kernel/diag/diag_misc.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Provide diagnose information via misc device /dev/diag.
+ *
+ * Copyright IBM Corp. 2024
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/types.h>
+
+#include <uapi/asm/diag.h>
+#include "diag_ioctl.h"
+
+static long diag_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	long rc;
+
+	switch (cmd) {
+	case DIAG324_GET_PIBLEN:
+		rc = diag324_piblen(arg);
+		break;
+	case DIAG324_GET_PIBBUF:
+		rc = diag324_pibbuf(arg);
+		break;
+	case DIAG310_GET_STRIDE:
+		rc = diag310_memtop_stride(arg);
+		break;
+	case DIAG310_GET_MEMTOPLEN:
+		rc = diag310_memtop_len(arg);
+		break;
+	case DIAG310_GET_MEMTOPBUF:
+		rc = diag310_memtop_buf(arg);
+		break;
+	default:
+		rc = -ENOIOCTLCMD;
+		break;
+	}
+	return rc;
+}
+
+static const struct file_operations fops = {
+	.owner		= THIS_MODULE,
+	.open		= nonseekable_open,
+	.unlocked_ioctl	= diag_ioctl,
+};
+
+static struct miscdevice diagdev = {
+	.name	= "diag",
+	.minor	= MISC_DYNAMIC_MINOR,
+	.fops	= &fops,
+	.mode	= 0444,
+};
+
+static int diag_init(void)
+{
+	return misc_register(&diagdev);
+}
+
+device_initcall(diag_init);