ia64/xen-unstable

view linux-2.6-xen-sparse/include/xen/gnttab.h @ 14100:e47738923a05

[LINUX] Purge include <linux/config.h>. It has been obsolete for some time now.

Signed-off-by: Ian Campbell <ian.campbell@xensource.com>
author Ian Campbell <ian.campbell@xensource.com>
date Fri Feb 23 16:56:45 2007 +0000 (2007-02-23)
parents 70f05d642a2e
children 1f7a6456c330
line source
1 /******************************************************************************
2 * gnttab.h
3 *
4 * Two sets of functionality:
5 * 1. Granting foreign access to our memory reservation.
6 * 2. Accessing others' memory reservations via grant references.
7 * (i.e., mechanisms for both sender and recipient of grant references)
8 *
9 * Copyright (c) 2004-2005, K A Fraser
10 * Copyright (c) 2005, Christopher Clark
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License version 2
14 * as published by the Free Software Foundation; or, when distributed
15 * separately from the Linux kernel or incorporated into other
16 * software packages, subject to the following license:
17 *
18 * Permission is hereby granted, free of charge, to any person obtaining a copy
19 * of this source file (the "Software"), to deal in the Software without
20 * restriction, including without limitation the rights to use, copy, modify,
21 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
22 * and to permit persons to whom the Software is furnished to do so, subject to
23 * the following conditions:
24 *
25 * The above copyright notice and this permission notice shall be included in
26 * all copies or substantial portions of the Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
31 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
32 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
33 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
34 * IN THE SOFTWARE.
35 */
37 #ifndef __ASM_GNTTAB_H__
38 #define __ASM_GNTTAB_H__
40 #include <asm/hypervisor.h>
41 #include <asm/maddr.h> /* maddr_t */
42 #include <xen/interface/grant_table.h>
43 #include <xen/features.h>
45 struct gnttab_free_callback {
46 struct gnttab_free_callback *next;
47 void (*fn)(void *);
48 void *arg;
49 u16 count;
50 };
52 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
53 int readonly);
55 /*
56 * End access through the given grant reference, iff the grant entry is no
57 * longer in use. Return 1 if the grant entry was freed, 0 if it is still in
58 * use.
59 */
60 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
62 /*
63 * Eventually end access through the given grant reference, and once that
64 * access has been ended, free the given page too. Access will be ended
65 * immediately iff the grant entry is not in use, otherwise it will happen
66 * some time later. page may be 0, in which case no freeing will occur.
67 */
68 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
69 unsigned long page);
71 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
73 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
74 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
76 int gnttab_query_foreign_access(grant_ref_t ref);
78 /*
79 * operations on reserved batches of grant references
80 */
81 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
83 void gnttab_free_grant_reference(grant_ref_t ref);
85 void gnttab_free_grant_references(grant_ref_t head);
87 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
89 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
91 void gnttab_release_grant_reference(grant_ref_t *private_head,
92 grant_ref_t release);
94 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
95 void (*fn)(void *), void *arg, u16 count);
96 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
98 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
99 unsigned long frame, int readonly);
101 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
102 unsigned long pfn);
104 int gnttab_suspend(void);
105 int gnttab_resume(void);
107 static inline void
108 gnttab_set_map_op(struct gnttab_map_grant_ref *map, maddr_t addr,
109 uint32_t flags, grant_ref_t ref, domid_t domid)
110 {
111 if (flags & GNTMAP_contains_pte)
112 map->host_addr = addr;
113 else if (xen_feature(XENFEAT_auto_translated_physmap))
114 map->host_addr = __pa(addr);
115 else
116 map->host_addr = addr;
118 map->flags = flags;
119 map->ref = ref;
120 map->dom = domid;
121 }
123 static inline void
124 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, maddr_t addr,
125 uint32_t flags, grant_handle_t handle)
126 {
127 if (flags & GNTMAP_contains_pte)
128 unmap->host_addr = addr;
129 else if (xen_feature(XENFEAT_auto_translated_physmap))
130 unmap->host_addr = __pa(addr);
131 else
132 unmap->host_addr = addr;
134 unmap->handle = handle;
135 unmap->dev_bus_addr = 0;
136 }
138 #endif /* __ASM_GNTTAB_H__ */