diff options
Diffstat (limited to 'drivers/hv/hv_utils_transport.h')
| -rw-r--r-- | drivers/hv/hv_utils_transport.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/hv/hv_utils_transport.h b/drivers/hv/hv_utils_transport.h new file mode 100644 index 0000000000..1c162393c2 --- /dev/null +++ b/drivers/hv/hv_utils_transport.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Kernel/userspace transport abstraction for Hyper-V util driver. + * + * Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com> + */ + +#ifndef _HV_UTILS_TRANSPORT_H +#define _HV_UTILS_TRANSPORT_H + +#include <linux/connector.h> +#include <linux/miscdevice.h> + +enum hvutil_transport_mode { + HVUTIL_TRANSPORT_INIT = 0, + HVUTIL_TRANSPORT_NETLINK, + HVUTIL_TRANSPORT_CHARDEV, + HVUTIL_TRANSPORT_DESTROY, +}; + +struct hvutil_transport { + int mode; /* hvutil_transport_mode */ + struct file_operations fops; /* file operations */ + struct miscdevice mdev; /* misc device */ + struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */ + struct list_head list; /* hvt_list */ + int (*on_msg)(void *, int); /* callback on new user message */ + void (*on_reset)(void); /* callback when userspace drops */ + void (*on_read)(void); /* callback on message read */ + u8 *outmsg; /* message to the userspace */ + int outmsg_len; /* its length */ + wait_queue_head_t outmsg_q; /* poll/read wait queue */ + struct mutex lock; /* protects struct members */ + struct completion release; /* synchronize with fd release */ +}; + +struct hvutil_transport *hvutil_transport_init(const char *name, + u32 cn_idx, u32 cn_val, + int (*on_msg)(void *, int), + void (*on_reset)(void)); +int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len, + void (*on_read_cb)(void)); +void hvutil_transport_destroy(struct hvutil_transport *hvt); + +#endif /* _HV_UTILS_TRANSPORT_H */ |