1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * Interfaces for vfio-ccw
4  *
5  * Copyright IBM Corp. 2017
6  *
7  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
8  */
9 
10 #ifndef _VFIO_CCW_H_
11 #define _VFIO_CCW_H_
12 
13 #include <linux/types.h>
14 
15 /* used for START SUBCHANNEL, always present */
16 struct ccw_io_region {
17 #define ORB_AREA_SIZE 12
18 	__u8	orb_area[ORB_AREA_SIZE];
19 #define SCSW_AREA_SIZE 12
20 	__u8	scsw_area[SCSW_AREA_SIZE];
21 #define IRB_AREA_SIZE 96
22 	__u8	irb_area[IRB_AREA_SIZE];
23 	__u32	ret_code;
24 } __packed;
25 
26 /*
27  * used for processing commands that trigger asynchronous actions
28  * Note: this is controlled by a capability
29  */
30 #define VFIO_CCW_ASYNC_CMD_HSCH (1 << 0)
31 #define VFIO_CCW_ASYNC_CMD_CSCH (1 << 1)
32 struct ccw_cmd_region {
33 	__u32 command;
34 	__u32 ret_code;
35 } __packed;
36 
37 /*
38  * Used for processing commands that read the subchannel-information block
39  * Reading this region triggers a stsch() to hardware
40  * Note: this is controlled by a capability
41  */
42 struct ccw_schib_region {
43 #define SCHIB_AREA_SIZE 52
44 	__u8 schib_area[SCHIB_AREA_SIZE];
45 } __packed;
46 
47 /*
48  * Used for returning a Channel Report Word to userspace.
49  * Note: this is controlled by a capability
50  */
51 struct ccw_crw_region {
52 	__u32 crw;
53 	__u32 pad;
54 } __packed;
55 
56 #endif
57