direct-io.hg

view linux-2.6-xen-sparse/include/xen/gnttab.h @ 13973:c4ed5b740a8d

linux: remove {lock,unlock}_vm_area(). Instead use vmalloc_sync_all()
in alloc_vm_area().
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Fri Feb 16 11:24:10 2007 +0000 (2007-02-16)
parents 70f05d642a2e
children e47738923a05
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 <linux/config.h>
41 #include <asm/hypervisor.h>
42 #include <asm/maddr.h> /* maddr_t */
43 #include <xen/interface/grant_table.h>
44 #include <xen/features.h>
46 struct gnttab_free_callback {
47 struct gnttab_free_callback *next;
48 void (*fn)(void *);
49 void *arg;
50 u16 count;
51 };
53 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
54 int readonly);
56 /*
57 * End access through the given grant reference, iff the grant entry is no
58 * longer in use. Return 1 if the grant entry was freed, 0 if it is still in
59 * use.
60 */
61 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
63 /*
64 * Eventually end access through the given grant reference, and once that
65 * access has been ended, free the given page too. Access will be ended
66 * immediately iff the grant entry is not in use, otherwise it will happen
67 * some time later. page may be 0, in which case no freeing will occur.
68 */
69 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
70 unsigned long page);
72 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
74 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
75 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
77 int gnttab_query_foreign_access(grant_ref_t ref);
79 /*
80 * operations on reserved batches of grant references
81 */
82 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
84 void gnttab_free_grant_reference(grant_ref_t ref);
86 void gnttab_free_grant_references(grant_ref_t head);
88 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
90 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
92 void gnttab_release_grant_reference(grant_ref_t *private_head,
93 grant_ref_t release);
95 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
96 void (*fn)(void *), void *arg, u16 count);
97 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
99 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
100 unsigned long frame, int readonly);
102 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
103 unsigned long pfn);
105 int gnttab_suspend(void);
106 int gnttab_resume(void);
108 static inline void
109 gnttab_set_map_op(struct gnttab_map_grant_ref *map, maddr_t addr,
110 uint32_t flags, grant_ref_t ref, domid_t domid)
111 {
112 if (flags & GNTMAP_contains_pte)
113 map->host_addr = addr;
114 else if (xen_feature(XENFEAT_auto_translated_physmap))
115 map->host_addr = __pa(addr);
116 else
117 map->host_addr = addr;
119 map->flags = flags;
120 map->ref = ref;
121 map->dom = domid;
122 }
124 static inline void
125 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, maddr_t addr,
126 uint32_t flags, grant_handle_t handle)
127 {
128 if (flags & GNTMAP_contains_pte)
129 unmap->host_addr = addr;
130 else if (xen_feature(XENFEAT_auto_translated_physmap))
131 unmap->host_addr = __pa(addr);
132 else
133 unmap->host_addr = addr;
135 unmap->handle = handle;
136 unmap->dev_bus_addr = 0;
137 }
139 #endif /* __ASM_GNTTAB_H__ */