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ad9a8612 JF |
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> | |
5f0ababb | 42 | #include <asm/xen/grant_table.h> |
ad9a8612 JF |
43 | |
44 | /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */ | |
45 | #define NR_GRANT_FRAMES 4 | |
46 | ||
47 | struct gnttab_free_callback { | |
48 | struct gnttab_free_callback *next; | |
49 | void (*fn)(void *); | |
50 | void *arg; | |
51 | u16 count; | |
52 | }; | |
53 | ||
183d03cc | 54 | int gnttab_init(void); |
0e91398f JF |
55 | int gnttab_suspend(void); |
56 | int gnttab_resume(void); | |
57 | ||
ad9a8612 JF |
58 | int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, |
59 | int readonly); | |
60 | ||
61 | /* | |
62 | * End access through the given grant reference, iff the grant entry is no | |
63 | * longer in use. Return 1 if the grant entry was freed, 0 if it is still in | |
64 | * use. | |
65 | */ | |
66 | int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly); | |
67 | ||
68 | /* | |
69 | * Eventually end access through the given grant reference, and once that | |
70 | * access has been ended, free the given page too. Access will be ended | |
71 | * immediately iff the grant entry is not in use, otherwise it will happen | |
72 | * some time later. page may be 0, in which case no freeing will occur. | |
73 | */ | |
74 | void gnttab_end_foreign_access(grant_ref_t ref, int readonly, | |
75 | unsigned long page); | |
76 | ||
77 | int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn); | |
78 | ||
79 | unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref); | |
80 | unsigned long gnttab_end_foreign_transfer(grant_ref_t ref); | |
81 | ||
82 | int gnttab_query_foreign_access(grant_ref_t ref); | |
83 | ||
84 | /* | |
85 | * operations on reserved batches of grant references | |
86 | */ | |
87 | int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head); | |
88 | ||
89 | void gnttab_free_grant_reference(grant_ref_t ref); | |
90 | ||
91 | void gnttab_free_grant_references(grant_ref_t head); | |
92 | ||
93 | int gnttab_empty_grant_references(const grant_ref_t *pprivate_head); | |
94 | ||
95 | int gnttab_claim_grant_reference(grant_ref_t *pprivate_head); | |
96 | ||
97 | void gnttab_release_grant_reference(grant_ref_t *private_head, | |
98 | grant_ref_t release); | |
99 | ||
100 | void gnttab_request_free_callback(struct gnttab_free_callback *callback, | |
101 | void (*fn)(void *), void *arg, u16 count); | |
102 | void gnttab_cancel_free_callback(struct gnttab_free_callback *callback); | |
103 | ||
104 | void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, | |
105 | unsigned long frame, int readonly); | |
106 | ||
107 | void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid, | |
108 | unsigned long pfn); | |
109 | ||
8d3d2106 IY |
110 | int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, |
111 | unsigned long max_nr_gframes, | |
112 | struct grant_entry **__shared); | |
113 | void arch_gnttab_unmap_shared(struct grant_entry *shared, | |
114 | unsigned long nr_gframes); | |
115 | ||
183d03cc SS |
116 | extern unsigned long xen_hvm_resume_frames; |
117 | unsigned int gnttab_max_grant_frames(void); | |
118 | ||
ad9a8612 JF |
119 | #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) |
120 | ||
121 | #endif /* __ASM_GNTTAB_H__ */ |