ia64/xen-unstable

view tools/blktap/drivers/tapaio.h @ 15783:c93e2a822d6f

[xen, xencomm] xencomm multiple page support
Current implementation doesn't allow struct xencomm_desc::address
array to be more than single page. On IA64 it causes 64GB+ domain
creation failure. This patch generalizes xencomm to allow multipage

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author kfraser@localhost.localdomain
date Tue Aug 28 15:32:27 2007 +0100 (2007-08-28)
parents eeeb77195ac2
children 89ee92328720
line source
1 /*
2 * Copyright (c) 2006 Andrew Warfield and Julian Chesterfield
3 * Copyright (c) 2007 Red Hat, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation; or, when distributed
8 * separately from the Linux kernel or incorporated into other
9 * software packages, subject to the following license:
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this source file (the "Software"), to deal in the Software without
13 * restriction, including without limitation the rights to use, copy, modify,
14 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
15 * and to permit persons to whom the Software is furnished to do so, subject to
16 * the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
27 * IN THE SOFTWARE.
28 */
30 #ifndef __TAPAIO_H__
31 #define __TAPAIO_H__
33 #include <pthread.h>
34 #include <libaio.h>
36 struct tap_aio_context {
37 io_context_t aio_ctx;
39 struct io_event *aio_events;
40 int max_aio_events;
42 pthread_t aio_thread;
43 int command_fd[2];
44 int completion_fd[2];
45 int pollfd;
46 unsigned int poll_in_thread : 1;
47 };
49 typedef struct tap_aio_context tap_aio_context_t;
51 int tap_aio_setup (tap_aio_context_t *ctx,
52 struct io_event *aio_events,
53 int max_aio_events);
54 void tap_aio_continue (tap_aio_context_t *ctx);
55 int tap_aio_get_events (tap_aio_context_t *ctx);
56 int tap_aio_more_events(tap_aio_context_t *ctx);
58 #endif /* __TAPAIO_H__ */