1 /******************************************************************************
2 * grant_table.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 */
36
37 #ifndef __ASM_GNTTAB_H__
38 #define __ASM_GNTTAB_H__
39
40 #include <asm/xen/hypervisor.h>
41 #include <xen/interface/grant_table.h>
42
43 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
44 #define NR_GRANT_FRAMES 4
45
46 struct gnttab_free_callback {
47 struct gnttab_free_callback *next;
48 void (*fn)(void *);
49 void *arg;
50 u16 count;
51 };
52
53 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
54 int readonly);
55
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);
62
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);
71
72 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
73
74 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
75 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
76
77 int gnttab_query_foreign_access(grant_ref_t ref);
78
79 /*
80 * operations on reserved batches of grant references
81 */
82 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
83
84 void gnttab_free_grant_reference(grant_ref_t ref);
85
86 void gnttab_free_grant_references(grant_ref_t head);
87
88 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
89
90 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
91
92 void gnttab_release_grant_reference(grant_ref_t *private_head,
93 grant_ref_t release);
94
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);
98
99 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
100 unsigned long frame, int readonly);
101
102 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
103 unsigned long pfn);
104
105 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
106
107 #endif /* __ASM_GNTTAB_H__ */
108
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