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-rw-r--r--include/xen/gntdev.h119
-rw-r--r--include/xen/grant_table.h44
2 files changed, 162 insertions, 1 deletions
diff --git a/include/xen/gntdev.h b/include/xen/gntdev.h
new file mode 100644
index 000000000000..eb23f4188f5a
--- /dev/null
+++ b/include/xen/gntdev.h
@@ -0,0 +1,119 @@
1/******************************************************************************
2 * gntdev.h
3 *
4 * Interface to /dev/xen/gntdev.
5 *
6 * Copyright (c) 2007, D G Murray
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation; or, when distributed
11 * separately from the Linux kernel or incorporated into other
12 * software packages, subject to the following license:
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this source file (the "Software"), to deal in the Software without
16 * restriction, including without limitation the rights to use, copy, modify,
17 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18 * and to permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30 * IN THE SOFTWARE.
31 */
32
33#ifndef __LINUX_PUBLIC_GNTDEV_H__
34#define __LINUX_PUBLIC_GNTDEV_H__
35
36struct ioctl_gntdev_grant_ref {
37 /* The domain ID of the grant to be mapped. */
38 uint32_t domid;
39 /* The grant reference of the grant to be mapped. */
40 uint32_t ref;
41};
42
43/*
44 * Inserts the grant references into the mapping table of an instance
45 * of gntdev. N.B. This does not perform the mapping, which is deferred
46 * until mmap() is called with @index as the offset.
47 */
48#define IOCTL_GNTDEV_MAP_GRANT_REF \
49_IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
50struct ioctl_gntdev_map_grant_ref {
51 /* IN parameters */
52 /* The number of grants to be mapped. */
53 uint32_t count;
54 uint32_t pad;
55 /* OUT parameters */
56 /* The offset to be used on a subsequent call to mmap(). */
57 uint64_t index;
58 /* Variable IN parameter. */
59 /* Array of grant references, of size @count. */
60 struct ioctl_gntdev_grant_ref refs[1];
61};
62
63/*
64 * Removes the grant references from the mapping table of an instance of
65 * of gntdev. N.B. munmap() must be called on the relevant virtual address(es)
66 * before this ioctl is called, or an error will result.
67 */
68#define IOCTL_GNTDEV_UNMAP_GRANT_REF \
69_IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
70struct ioctl_gntdev_unmap_grant_ref {
71 /* IN parameters */
72 /* The offset was returned by the corresponding map operation. */
73 uint64_t index;
74 /* The number of pages to be unmapped. */
75 uint32_t count;
76 uint32_t pad;
77};
78
79/*
80 * Returns the offset in the driver's address space that corresponds
81 * to @vaddr. This can be used to perform a munmap(), followed by an
82 * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by
83 * the caller. The number of pages that were allocated at the same time as
84 * @vaddr is returned in @count.
85 *
86 * N.B. Where more than one page has been mapped into a contiguous range, the
87 * supplied @vaddr must correspond to the start of the range; otherwise
88 * an error will result. It is only possible to munmap() the entire
89 * contiguously-allocated range at once, and not any subrange thereof.
90 */
91#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \
92_IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
93struct ioctl_gntdev_get_offset_for_vaddr {
94 /* IN parameters */
95 /* The virtual address of the first mapped page in a range. */
96 uint64_t vaddr;
97 /* OUT parameters */
98 /* The offset that was used in the initial mmap() operation. */
99 uint64_t offset;
100 /* The number of pages mapped in the VM area that begins at @vaddr. */
101 uint32_t count;
102 uint32_t pad;
103};
104
105/*
106 * Sets the maximum number of grants that may mapped at once by this gntdev
107 * instance.
108 *
109 * N.B. This must be called before any other ioctl is performed on the device.
110 */
111#define IOCTL_GNTDEV_SET_MAX_GRANTS \
112_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
113struct ioctl_gntdev_set_max_grants {
114 /* IN parameter */
115 /* The maximum number of grants that may be mapped at once. */
116 uint32_t count;
117};
118
119#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 9a731706a016..b1fab6b5b3ef 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -37,10 +37,16 @@
37#ifndef __ASM_GNTTAB_H__ 37#ifndef __ASM_GNTTAB_H__
38#define __ASM_GNTTAB_H__ 38#define __ASM_GNTTAB_H__
39 39
40#include <asm/xen/hypervisor.h> 40#include <asm/page.h>
41
42#include <xen/interface/xen.h>
41#include <xen/interface/grant_table.h> 43#include <xen/interface/grant_table.h>
44
45#include <asm/xen/hypervisor.h>
42#include <asm/xen/grant_table.h> 46#include <asm/xen/grant_table.h>
43 47
48#include <xen/features.h>
49
44/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */ 50/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
45#define NR_GRANT_FRAMES 4 51#define NR_GRANT_FRAMES 4
46 52
@@ -107,6 +113,37 @@ void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
107void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid, 113void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
108 unsigned long pfn); 114 unsigned long pfn);
109 115
116static inline void
117gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
118 uint32_t flags, grant_ref_t ref, domid_t domid)
119{
120 if (flags & GNTMAP_contains_pte)
121 map->host_addr = addr;
122 else if (xen_feature(XENFEAT_auto_translated_physmap))
123 map->host_addr = __pa(addr);
124 else
125 map->host_addr = addr;
126
127 map->flags = flags;
128 map->ref = ref;
129 map->dom = domid;
130}
131
132static inline void
133gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
134 uint32_t flags, grant_handle_t handle)
135{
136 if (flags & GNTMAP_contains_pte)
137 unmap->host_addr = addr;
138 else if (xen_feature(XENFEAT_auto_translated_physmap))
139 unmap->host_addr = __pa(addr);
140 else
141 unmap->host_addr = addr;
142
143 unmap->handle = handle;
144 unmap->dev_bus_addr = 0;
145}
146
110int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, 147int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
111 unsigned long max_nr_gframes, 148 unsigned long max_nr_gframes,
112 struct grant_entry **__shared); 149 struct grant_entry **__shared);
@@ -118,4 +155,9 @@ unsigned int gnttab_max_grant_frames(void);
118 155
119#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) 156#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
120 157
158int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
159 struct page **pages, unsigned int count);
160int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
161 struct page **pages, unsigned int count);
162
121#endif /* __ASM_GNTTAB_H__ */ 163#endif /* __ASM_GNTTAB_H__ */