3 * Copyright (c) 2009, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
25 #ifndef _VMBUS_PRIVATE_H_
26 #define _VMBUS_PRIVATE_H_
29 #include "vmbus_api.h"
31 #include "channel_mgmt.h"
32 #include "ring_buffer.h"
33 #include <linux/list.h>
37 * Maximum channels is determined by the size of the interrupt page
38 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
39 * and the other is receive endpoint interrupt
41 #define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
43 /* The value here must be in multiple of 32 */
44 /* TODO: Need to make this configurable */
45 #define MAX_NUM_CHANNELS_SUPPORTED 256
48 enum vmbus_connect_state
{
55 #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
57 struct vmbus_connection
{
58 enum vmbus_connect_state conn_state
;
60 atomic_t next_gpadl_handle
;
63 * Represents channel interrupts. Each bit position represents a
64 * channel. When a channel sends an interrupt via VMBUS, it finds its
65 * bit in the sendInterruptPage, set it and calls Hv to generate a port
66 * event. The other end receives the port event and parse the
67 * recvInterruptPage to see which bit is set
74 * 2 pages - 1st page for parent->child notification and 2nd
75 * is child->parent notification
78 struct list_head chn_msg_list
;
79 spinlock_t channelmsg_lock
;
81 /* List of channels */
82 struct list_head chn_list
;
83 spinlock_t channel_lock
;
85 struct workqueue_struct
*work_queue
;
89 struct vmbus_msginfo
{
90 /* Bookkeeping stuff */
91 struct list_head msglist_entry
;
93 /* Synchronize the request/response if needed */
95 wait_queue_head_t wait_event
;
97 /* The message itself */
102 extern struct vmbus_connection vmbus_connection
;
104 /* General vmbus interface */
106 struct hv_device
*vmbus_child_device_create(struct hv_guid
*type
,
107 struct hv_guid
*instance
,
108 struct vmbus_channel
*channel
);
110 int vmbus_child_dev_add(struct hv_device
*device
);
111 int vmbus_child_device_register(struct hv_device
*child_device_obj
);
112 void vmbus_child_device_unregister(struct hv_device
*device_obj
);
115 /* VmbusChildDeviceDestroy( */
116 /* struct hv_device *); */
118 struct vmbus_channel
*relid2channel(u32 relid
);
121 /* Connection interface */
123 int vmbus_connect(void);
125 int vmbus_disconnect(void);
127 int vmbus_post_msg(void *buffer
, size_t buflen
);
129 int vmbus_set_event(u32 child_relid
);
131 void vmbus_on_event(unsigned long data
);
134 #endif /* _VMBUS_PRIVATE_H_ */