s390/pci: add ioctl interface for CLP

Provide a user space interface to issue call logical-processor instructions.
Only selected CLP commands are allowed, enough to get the full overview of
the installed PCI functions.

Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/s390/include/uapi/asm/clp.h b/arch/s390/include/uapi/asm/clp.h
new file mode 100644
index 000000000000..ab72d9d24373
--- /dev/null
+++ b/arch/s390/include/uapi/asm/clp.h
@@ -0,0 +1,28 @@
+/*
+ * ioctl interface for /dev/clp
+ *
+ * Copyright IBM Corp. 2016
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef _ASM_CLP_H
+#define _ASM_CLP_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+struct clp_req {
+        unsigned int c : 1;
+        unsigned int r : 1;
+        unsigned int lps : 6;
+        unsigned int cmd : 8;
+        unsigned int : 16;
+        unsigned int reserved;
+        __u64 data_p;
+};
+
+#define CLP_IOCTL_MAGIC 'c'
+
+#define CLP_SYNC _IOWR(CLP_IOCTL_MAGIC, 0xC1, struct clp_req)
+
+#endif