debuggers.hg

view tools/blktap2/drivers/tapdisk-ring.h @ 22848:6341fe0f4e5a

Added tag 4.1.0-rc2 for changeset 9dca60d88c63
author Keir Fraser <keir@xen.org>
date Tue Jan 25 14:06:55 2011 +0000 (2011-01-25)
parents 1c627434605e
children
line source
1 /*
2 * Copyright (c) 2008, XenSource Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of XenSource Inc. nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #ifndef _TAPDISK_RING_H_
29 #define _TAPDISK_RING_H_
31 #include <inttypes.h>
33 #include <xenctrl.h>
34 #include <xen/io/ring.h>
36 typedef struct td_uring td_uring_t;
37 typedef struct td_uring_header td_uring_header_t;
38 typedef struct td_uring_request td_uring_request_t;
39 typedef struct td_uring_response td_uring_response_t;
41 struct td_uring {
42 int ctlfd;
44 char *shmem_path;
45 char *ctlfd_path;
47 void *shmem;
48 void *ring_area;
49 void *data_area;
50 };
52 struct td_uring_header {
53 char cookie[8];
54 uint32_t version;
55 uint32_t shmem_size;
56 uint32_t ring_size;
57 uint32_t data_size;
58 char reserved[4064];
59 };
61 struct td_uring_request {
62 uint8_t op;
63 uint64_t id;
64 uint64_t sec;
65 uint32_t secs;
66 uint32_t offset;
67 };
69 struct td_uring_response {
70 uint8_t op;
71 uint64_t id;
72 uint8_t status;
73 };
75 DEFINE_RING_TYPES(td_uring, td_uring_request_t, td_uring_response_t);
77 int tapdisk_uring_create(td_uring_t *, const char *location,
78 uint32_t ring_size, uint32_t data_size);
79 int tapdisk_uring_destroy(td_uring_t *);
81 int tapdisk_uring_connect(td_uring_t *, const char *location);
82 int tapdisk_uring_disconnect(td_uring_t *);
84 int tapdisk_uring_poll(td_uring_t *);
85 int tapdisk_uring_kick(td_uring_t *);
87 #endif