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43aa3132 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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2 | /* |
3 | * Kernel/userspace transport abstraction for Hyper-V util driver. | |
4 | * | |
5 | * Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com> | |
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6 | */ |
7 | ||
8 | #ifndef _HV_UTILS_TRANSPORT_H | |
9 | #define _HV_UTILS_TRANSPORT_H | |
10 | ||
11 | #include <linux/connector.h> | |
12 | #include <linux/miscdevice.h> | |
13 | ||
14 | enum hvutil_transport_mode { | |
15 | HVUTIL_TRANSPORT_INIT = 0, | |
16 | HVUTIL_TRANSPORT_NETLINK, | |
17 | HVUTIL_TRANSPORT_CHARDEV, | |
a1502566 | 18 | HVUTIL_TRANSPORT_DESTROY, |
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19 | }; |
20 | ||
21 | struct hvutil_transport { | |
22 | int mode; /* hvutil_transport_mode */ | |
23 | struct file_operations fops; /* file operations */ | |
24 | struct miscdevice mdev; /* misc device */ | |
25 | struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */ | |
26 | struct list_head list; /* hvt_list */ | |
27 | int (*on_msg)(void *, int); /* callback on new user message */ | |
28 | void (*on_reset)(void); /* callback when userspace drops */ | |
e0fa3e5e | 29 | void (*on_read)(void); /* callback on message read */ |
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30 | u8 *outmsg; /* message to the userspace */ |
31 | int outmsg_len; /* its length */ | |
32 | wait_queue_head_t outmsg_q; /* poll/read wait queue */ | |
a72f3a4c | 33 | struct mutex lock; /* protects struct members */ |
e9c18ae6 | 34 | struct completion release; /* synchronize with fd release */ |
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35 | }; |
36 | ||
37 | struct hvutil_transport *hvutil_transport_init(const char *name, | |
38 | u32 cn_idx, u32 cn_val, | |
39 | int (*on_msg)(void *, int), | |
40 | void (*on_reset)(void)); | |
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41 | int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len, |
42 | void (*on_read_cb)(void)); | |
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43 | void hvutil_transport_destroy(struct hvutil_transport *hvt); |
44 | ||
45 | #endif /* _HV_UTILS_TRANSPORT_H */ |