direct-io.hg

view linux-2.6-xen-sparse/include/xen/gnttab.h @ 12244:d150a2178bd4

[LINUX] Don't use uint64_t parameter to gnttab_set_{,un}map_op() when
the upper 32 bits will never be used (i.e., i386 non-pae).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
author kfraser@localhost.localdomain
date Mon Nov 06 09:02:15 2006 +0000 (2006-11-06)
parents 4eac59fe1abc
children b223ba940ed1
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 <linux/mm.h>
42 #include <asm/hypervisor.h>
43 #include <xen/interface/grant_table.h>
44 #include <xen/features.h>
46 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
47 #ifdef __ia64__
48 #define NR_GRANT_FRAMES 1
49 #else
50 #define NR_GRANT_FRAMES 4
51 #endif
53 struct gnttab_free_callback {
54 struct gnttab_free_callback *next;
55 void (*fn)(void *);
56 void *arg;
57 u16 count;
58 };
60 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
61 int readonly);
63 /*
64 * End access through the given grant reference, iff the grant entry is no
65 * longer in use. Return 1 if the grant entry was freed, 0 if it is still in
66 * use.
67 */
68 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
70 /*
71 * Eventually end access through the given grant reference, and once that
72 * access has been ended, free the given page too. Access will be ended
73 * immediately iff the grant entry is not in use, otherwise it will happen
74 * some time later. page may be 0, in which case no freeing will occur.
75 */
76 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
77 unsigned long page);
79 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
81 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
82 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
84 int gnttab_query_foreign_access(grant_ref_t ref);
86 /*
87 * operations on reserved batches of grant references
88 */
89 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
91 void gnttab_free_grant_reference(grant_ref_t ref);
93 void gnttab_free_grant_references(grant_ref_t head);
95 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
97 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
99 void gnttab_release_grant_reference(grant_ref_t *private_head,
100 grant_ref_t release);
102 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
103 void (*fn)(void *), void *arg, u16 count);
104 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
106 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
107 unsigned long frame, int readonly);
109 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
110 unsigned long pfn);
112 #ifdef __ia64__
113 #define gnttab_map_vaddr(map) __va(map.dev_bus_addr)
114 #else
115 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
116 #endif
118 int gnttab_suspend(void);
119 int gnttab_resume(void);
121 static inline void
122 gnttab_set_map_op(struct gnttab_map_grant_ref *map, maddr_t addr,
123 uint32_t flags, grant_ref_t ref, domid_t domid)
124 {
125 if (flags & GNTMAP_contains_pte)
126 map->host_addr = addr;
127 else if (xen_feature(XENFEAT_auto_translated_physmap))
128 map->host_addr = __pa(addr);
129 else
130 map->host_addr = addr;
132 map->flags = flags;
133 map->ref = ref;
134 map->dom = domid;
135 }
137 static inline void
138 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, maddr_t addr,
139 uint32_t flags, grant_handle_t handle)
140 {
141 if (flags & GNTMAP_contains_pte)
142 unmap->host_addr = addr;
143 else if (xen_feature(XENFEAT_auto_translated_physmap))
144 unmap->host_addr = __pa(addr);
145 else
146 unmap->host_addr = addr;
148 unmap->handle = handle;
149 unmap->dev_bus_addr = 0;
150 }
152 #endif /* __ASM_GNTTAB_H__ */