[PATCH 13/15] cxl: Userspace header file.

[Michael Neuling <mikey@neuling.org>]

From: Ian Munsie <imunsie@au1.ibm.com>

This defines structs and magic numbers required for userspace to interact with
the kernel cxl driver via /dev/cxl/afu0.0.

It adds this header file Kbuild so it's exported when doing make
headers_installs.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
---
 include/uapi/Kbuild      |  1 +
 include/uapi/misc/Kbuild |  2 ++
 include/uapi/misc/cxl.h  | 88 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+)
 create mode 100644 include/uapi/misc/Kbuild
 create mode 100644 include/uapi/misc/cxl.h

diff --git a/include/uapi/Kbuild b/include/uapi/Kbuild
index 81d2106..245aa6e 100644
--- a/include/uapi/Kbuild
+++ b/include/uapi/Kbuild
@@ -12,3 +12,4 @@ header-y += video/
 header-y += drm/
 header-y += xen/
 header-y += scsi/
+header-y += misc/
diff --git a/include/uapi/misc/Kbuild b/include/uapi/misc/Kbuild
new file mode 100644
index 0000000..e96cae7
--- /dev/null
+++ b/include/uapi/misc/Kbuild
@@ -0,0 +1,2 @@
+# misc Header export list
+header-y += cxl.h
diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h
new file mode 100644
index 0000000..6a394b5
--- /dev/null
+++ b/include/uapi/misc/cxl.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _UAPI_ASM_CXL_H
+#define _UAPI_ASM_CXL_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+/* ioctls */
+struct cxl_ioctl_start_work {
+	__u64 wed;
+	__u64 amr;
+	__u64 reserved1;
+	__u32 reserved2;
+	__s16 num_interrupts; /* -1 = use value from afu descriptor */
+	__u16 process_element; /* returned from kernel */
+	__u64 reserved3;
+	__u64 reserved4;
+	__u64 reserved5;
+	__u64 reserved6;
+};
+
+#define CXL_MAGIC 0xCA
+#define CXL_IOCTL_START_WORK      _IOWR(CXL_MAGIC, 0x00, struct cxl_ioctl_start_work)
+#define CXL_IOCTL_CHECK_ERROR     _IO(CXL_MAGIC,   0x02)
+
+/* events from read() */
+
+enum cxl_event_type {
+	CXL_EVENT_READ_FAIL     = -1,
+	CXL_EVENT_RESERVED      = 0,
+	CXL_EVENT_AFU_INTERRUPT = 1,
+	CXL_EVENT_DATA_STORAGE  = 2,
+	CXL_EVENT_AFU_ERROR     = 3,
+};
+
+struct cxl_event_header {
+	__u32 type;
+	__u16 size;
+	__u16 process_element;
+	__u64 reserved1;
+	__u64 reserved2;
+	__u64 reserved3;
+};
+
+struct cxl_event_afu_interrupt {
+	struct cxl_event_header header;
+	__u16 irq; /* Raised AFU interrupt number */
+	__u16 reserved1;
+	__u32 reserved2;
+	__u64 reserved3;
+	__u64 reserved4;
+	__u64 reserved5;
+};
+
+struct cxl_event_data_storage {
+	struct cxl_event_header header;
+	__u64 addr;
+	__u64 reserved1;
+	__u64 reserved2;
+	__u64 reserved3;
+};
+
+struct cxl_event_afu_error {
+	struct cxl_event_header header;
+	__u64 err;
+	__u64 reserved1;
+	__u64 reserved2;
+	__u64 reserved3;
+};
+
+struct cxl_event {
+	union {
+		struct cxl_event_header header;
+		struct cxl_event_afu_interrupt irq;
+		struct cxl_event_data_storage fault;
+		struct cxl_event_afu_error afu_err;
+	};
+};
+
+#endif
-- 
1.9.1