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
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