xref: /openbmc/linux/include/uapi/linux/pr.h (revision 255c4f4a)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_PR_H
3 #define _UAPI_PR_H
4 
5 #include <linux/types.h>
6 
7 enum pr_status {
8 	PR_STS_SUCCESS			= 0x0,
9 	/*
10 	 * The following error codes are based on SCSI, because the interface
11 	 * was originally created for it and has existing users.
12 	 */
13 	/* Generic device failure. */
14 	PR_STS_IOERR			= 0x2,
15 	PR_STS_RESERVATION_CONFLICT	= 0x18,
16 	/* Temporary path failure that can be retried. */
17 	PR_STS_RETRY_PATH_FAILURE	= 0xe0000,
18 	/* The request was failed due to a fast failure timer. */
19 	PR_STS_PATH_FAST_FAILED		= 0xf0000,
20 	/* The path cannot be reached and has been marked as failed. */
21 	PR_STS_PATH_FAILED		= 0x10000,
22 };
23 
24 enum pr_type {
25 	PR_WRITE_EXCLUSIVE		= 1,
26 	PR_EXCLUSIVE_ACCESS		= 2,
27 	PR_WRITE_EXCLUSIVE_REG_ONLY	= 3,
28 	PR_EXCLUSIVE_ACCESS_REG_ONLY	= 4,
29 	PR_WRITE_EXCLUSIVE_ALL_REGS	= 5,
30 	PR_EXCLUSIVE_ACCESS_ALL_REGS	= 6,
31 };
32 
33 struct pr_reservation {
34 	__u64	key;
35 	__u32	type;
36 	__u32	flags;
37 };
38 
39 struct pr_registration {
40 	__u64	old_key;
41 	__u64	new_key;
42 	__u32	flags;
43 	__u32	__pad;
44 };
45 
46 struct pr_preempt {
47 	__u64	old_key;
48 	__u64	new_key;
49 	__u32	type;
50 	__u32	flags;
51 };
52 
53 struct pr_clear {
54 	__u64	key;
55 	__u32	flags;
56 	__u32	__pad;
57 };
58 
59 #define PR_FL_IGNORE_KEY	(1 << 0)	/* ignore existing key */
60 
61 #define IOC_PR_REGISTER		_IOW('p', 200, struct pr_registration)
62 #define IOC_PR_RESERVE		_IOW('p', 201, struct pr_reservation)
63 #define IOC_PR_RELEASE		_IOW('p', 202, struct pr_reservation)
64 #define IOC_PR_PREEMPT		_IOW('p', 203, struct pr_preempt)
65 #define IOC_PR_PREEMPT_ABORT	_IOW('p', 204, struct pr_preempt)
66 #define IOC_PR_CLEAR		_IOW('p', 205, struct pr_clear)
67 
68 #endif /* _UAPI_PR_H */
69