]> git.karo-electronics.de Git - mv-sheeva.git/blob - drivers/staging/hv/vmbus_packet_format.h
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[mv-sheeva.git] / drivers / staging / hv / vmbus_packet_format.h
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 #ifndef _VMBUSPACKETFORMAT_H_
25 #define _VMBUSPACKETFORMAT_H_
26
27 struct vmpacket_descriptor {
28         u16 type;
29         u16 offset8;
30         u16 len8;
31         u16 flags;
32         u64 trans_id;
33 } __packed;
34
35 struct vmpacket_header {
36         u32 prev_pkt_start_offset;
37         struct vmpacket_descriptor descriptor;
38 } __packed;
39
40 struct vmtransfer_page_range {
41         u32 byte_count;
42         u32 byte_offset;
43 } __packed;
44
45 struct vmtransfer_page_packet_header {
46         struct vmpacket_descriptor d;
47         u16 xfer_pageset_id;
48         bool sender_owns_set;
49         u8 reserved;
50         u32 range_cnt;
51         struct vmtransfer_page_range ranges[1];
52 } __packed;
53
54 struct vmgpadl_packet_header {
55         struct vmpacket_descriptor d;
56         u32 gpadl;
57         u32 reserved;
58 } __packed;
59
60 struct vmadd_remove_transfer_page_set {
61         struct vmpacket_descriptor d;
62         u32 gpadl;
63         u16 xfer_pageset_id;
64         u16 reserved;
65 } __packed;
66
67 /*
68  * This structure defines a range in guest physical space that can be made to
69  * look virtually contiguous.
70  */
71 struct gpa_range {
72         u32 byte_count;
73         u32 byte_offset;
74         u64 pfn_array[0];
75 };
76
77 /*
78  * This is the format for an Establish Gpadl packet, which contains a handle by
79  * which this GPADL will be known and a set of GPA ranges associated with it.
80  * This can be converted to a MDL by the guest OS.  If there are multiple GPA
81  * ranges, then the resulting MDL will be "chained," representing multiple VA
82  * ranges.
83  */
84 struct vmestablish_gpadl {
85         struct vmpacket_descriptor d;
86         u32 gpadl;
87         u32 range_cnt;
88         struct gpa_range range[1];
89 } __packed;
90
91 /*
92  * This is the format for a Teardown Gpadl packet, which indicates that the
93  * GPADL handle in the Establish Gpadl packet will never be referenced again.
94  */
95 struct vmteardown_gpadl {
96         struct vmpacket_descriptor d;
97         u32 gpadl;
98         u32 reserved;   /* for alignment to a 8-byte boundary */
99 } __packed;
100
101 /*
102  * This is the format for a GPA-Direct packet, which contains a set of GPA
103  * ranges, in addition to commands and/or data.
104  */
105 struct vmdata_gpa_direct {
106         struct vmpacket_descriptor d;
107         u32 reserved;
108         u32 range_cnt;
109         struct gpa_range range[1];
110 } __packed;
111
112 /* This is the format for a Additional Data Packet. */
113 struct vmadditional_data {
114         struct vmpacket_descriptor d;
115         u64 total_bytes;
116         u32 offset;
117         u32 byte_cnt;
118         unsigned char data[1];
119 } __packed;
120
121 union vmpacket_largest_possible_header {
122         struct vmpacket_descriptor simple_hdr;
123         struct vmtransfer_page_packet_header xfer_page_hdr;
124         struct vmgpadl_packet_header gpadl_hdr;
125         struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
126         struct vmestablish_gpadl establish_gpadl_hdr;
127         struct vmteardown_gpadl teardown_gpadl_hdr;
128         struct vmdata_gpa_direct data_gpa_direct_hdr;
129 };
130
131 #define VMPACKET_DATA_START_ADDRESS(__packet)   \
132         (void *)(((unsigned char *)__packet) +  \
133          ((struct vmpacket_descriptor)__packet)->offset8 * 8)
134
135 #define VMPACKET_DATA_LENGTH(__packet)          \
136         ((((struct vmpacket_descriptor)__packet)->len8 -        \
137           ((struct vmpacket_descriptor)__packet)->offset8) * 8)
138
139 #define VMPACKET_TRANSFER_MODE(__packet)        \
140         (((struct IMPACT)__packet)->type)
141
142 enum vmbus_packet_type {
143         VM_PKT_INVALID                          = 0x0,
144         VM_PKT_SYNCH                            = 0x1,
145         VM_PKT_ADD_XFER_PAGESET                 = 0x2,
146         VM_PKT_RM_XFER_PAGESET                  = 0x3,
147         VM_PKT_ESTABLISH_GPADL                  = 0x4,
148         VM_PKT_TEARDOWN_GPADL                   = 0x5,
149         VM_PKT_DATA_INBAND                      = 0x6,
150         VM_PKT_DATA_USING_XFER_PAGES            = 0x7,
151         VM_PKT_DATA_USING_GPADL                 = 0x8,
152         VM_PKT_DATA_USING_GPA_DIRECT            = 0x9,
153         VM_PKT_CANCEL_REQUEST                   = 0xa,
154         VM_PKT_COMP                             = 0xb,
155         VM_PKT_DATA_USING_ADDITIONAL_PKT        = 0xc,
156         VM_PKT_ADDITIONAL_DATA                  = 0xd
157 };
158
159 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED     1
160
161 #endif