1 /*
2  *
3  * Copyright (c) 2009, Microsoft Corporation.
4  *
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.
8  *
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
12  * more details.
13  *
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.
17  *
18  * Authors:
19  *   Haiyang Zhang <haiyangz@microsoft.com>
20  *   Hank Janssen  <hjanssen@microsoft.com>
21  *
22  */
23 
24 
25 #ifndef _VMBUS_PRIVATE_H_
26 #define _VMBUS_PRIVATE_H_
27 
28 #include "hv.h"
29 #include "vmbus_api.h"
30 #include "channel.h"
31 #include "channel_mgmt.h"
32 #include "ring_buffer.h"
33 #include <linux/list.h>
34 #include <asm/sync_bitops.h>
35 
36 
37 /*
38  * Maximum channels is determined by the size of the interrupt page
39  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
40  * and the other is receive endpoint interrupt
41  */
42 #define MAX_NUM_CHANNELS	((PAGE_SIZE >> 1) << 3)	/* 16348 channels */
43 
44 /* The value here must be in multiple of 32 */
45 /* TODO: Need to make this configurable */
46 #define MAX_NUM_CHANNELS_SUPPORTED	256
47 
48 
49 enum vmbus_connect_state {
50 	DISCONNECTED,
51 	CONNECTING,
52 	CONNECTED,
53 	DISCONNECTING
54 };
55 
56 #define MAX_SIZE_CHANNEL_MESSAGE	HV_MESSAGE_PAYLOAD_BYTE_COUNT
57 
58 struct vmbus_connection {
59 	enum vmbus_connect_state conn_state;
60 
61 	atomic_t next_gpadl_handle;
62 
63 	/*
64 	 * Represents channel interrupts. Each bit position represents a
65 	 * channel.  When a channel sends an interrupt via VMBUS, it finds its
66 	 * bit in the sendInterruptPage, set it and calls Hv to generate a port
67 	 * event. The other end receives the port event and parse the
68 	 * recvInterruptPage to see which bit is set
69 	 */
70 	void *int_page;
71 	void *send_int_page;
72 	void *recv_int_page;
73 
74 	/*
75 	 * 2 pages - 1st page for parent->child notification and 2nd
76 	 * is child->parent notification
77 	 */
78 	void *monitor_pages;
79 	struct list_head chn_msg_list;
80 	spinlock_t channelmsg_lock;
81 
82 	/* List of channels */
83 	struct list_head chn_list;
84 	spinlock_t channel_lock;
85 
86 	struct workqueue_struct *work_queue;
87 };
88 
89 
90 struct vmbus_msginfo {
91 	/* Bookkeeping stuff */
92 	struct list_head msglist_entry;
93 
94 	/* Synchronize the request/response if needed */
95 	int wait_condition;
96 	wait_queue_head_t  wait_event;
97 
98 	/* The message itself */
99 	unsigned char msg[0];
100 };
101 
102 
103 extern struct vmbus_connection vmbus_connection;
104 
105 /* General vmbus interface */
106 
107 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
108 					 struct hv_guid *instance,
109 					 struct vmbus_channel *channel);
110 
111 int vmbus_child_device_register(struct hv_device *child_device_obj);
112 void vmbus_child_device_unregister(struct hv_device *device_obj);
113 
114 /* static void */
115 /* VmbusChildDeviceDestroy( */
116 /* struct hv_device *); */
117 
118 struct vmbus_channel *relid2channel(u32 relid);
119 
120 
121 /* Connection interface */
122 
123 int vmbus_connect(void);
124 
125 int vmbus_disconnect(void);
126 
127 int vmbus_post_msg(void *buffer, size_t buflen);
128 
129 int vmbus_set_event(u32 child_relid);
130 
131 void vmbus_on_event(unsigned long data);
132 
133 
134 #endif /* _VMBUS_PRIVATE_H_ */
135