direct-io.hg

view linux-2.6-xen-sparse/include/xen/gnttab.h @ 11509:2e6c10dc7c0b

[POWERPC][XEN] make sure put_domain() is called in case of allocate_rma() failuer

Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
author Jimi Xenidis <jimix@watson.ibm.com>
date Tue Sep 12 10:53:46 2006 -0400 (2006-09-12)
parents 5552bc2c3716
children 4eac59fe1abc
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 <xen/interface/grant_table.h>
43 #include <xen/features.h>
45 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
46 #ifdef __ia64__
47 #define NR_GRANT_FRAMES 1
48 #else
49 #define NR_GRANT_FRAMES 4
50 #endif
52 struct gnttab_free_callback {
53 struct gnttab_free_callback *next;
54 void (*fn)(void *);
55 void *arg;
56 u16 count;
57 };
59 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
60 int readonly);
62 /*
63 * End access through the given grant reference, iff the grant entry is no
64 * longer in use. Return 1 if the grant entry was freed, 0 if it is still in
65 * use.
66 */
67 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
69 /*
70 * Eventually end access through the given grant reference, and once that
71 * access has been ended, free the given page too. Access will be ended
72 * immediately iff the grant entry is not in use, otherwise it will happen
73 * some time later. page may be 0, in which case no freeing will occur.
74 */
75 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
76 unsigned long page);
78 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
80 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
81 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
83 int gnttab_query_foreign_access(grant_ref_t ref);
85 /*
86 * operations on reserved batches of grant references
87 */
88 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
90 void gnttab_free_grant_reference(grant_ref_t ref);
92 void gnttab_free_grant_references(grant_ref_t head);
94 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
96 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
98 void gnttab_release_grant_reference(grant_ref_t *private_head,
99 grant_ref_t release);
101 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
102 void (*fn)(void *), void *arg, u16 count);
103 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
105 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
106 unsigned long frame, int readonly);
108 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
109 unsigned long pfn);
111 #ifdef __ia64__
112 #define gnttab_map_vaddr(map) __va(map.dev_bus_addr)
113 #else
114 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
115 #endif
117 int gnttab_suspend(void);
118 int gnttab_resume(void);
120 static inline void
121 gnttab_set_map_op(struct gnttab_map_grant_ref *map, unsigned long addr,
122 uint32_t flags, grant_ref_t ref, domid_t domid)
123 {
124 if (flags & GNTMAP_contains_pte)
125 map->host_addr = addr;
126 else if (xen_feature(XENFEAT_auto_translated_physmap))
127 map->host_addr = __pa(addr);
128 else
129 map->host_addr = addr;
131 map->flags = flags;
132 map->ref = ref;
133 map->dom = domid;
134 }
136 static inline void
137 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, unsigned long addr,
138 uint32_t flags, grant_handle_t handle)
139 {
140 if (flags & GNTMAP_contains_pte)
141 unmap->host_addr = addr;
142 else if (xen_feature(XENFEAT_auto_translated_physmap))
143 unmap->host_addr = __pa(addr);
144 else
145 unmap->host_addr = addr;
147 unmap->handle = handle;
148 unmap->dev_bus_addr = 0;
149 }
151 #endif /* __ASM_GNTTAB_H__ */