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1 | /****************************************************************************** |
2 | * gntalloc.h |
3 | * |
4 | * Interface to /dev/xen/gntalloc. |
5 | * |
6 | * Author: Daniel De Graaf <dgdegra@tycho.nsa.gov> |
7 | * |
8 | * This file is in the public domain. |
9 | */ |
10 | |
11 | #ifndef __LINUX_PUBLIC_GNTALLOC_H__ |
12 | #define __LINUX_PUBLIC_GNTALLOC_H__ |
13 | |
14 | /* |
15 | * Allocates a new page and creates a new grant reference. |
16 | */ |
17 | #define IOCTL_GNTALLOC_ALLOC_GREF \ |
18 | _IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref)) |
19 | struct ioctl_gntalloc_alloc_gref { |
20 | /* IN parameters */ |
21 | /* The ID of the domain to be given access to the grants. */ |
22 | uint16_t domid; |
23 | /* Flags for this mapping */ |
24 | uint16_t flags; |
25 | /* Number of pages to map */ |
26 | uint32_t count; |
27 | /* OUT parameters */ |
28 | /* The offset to be used on a subsequent call to mmap(). */ |
29 | uint64_t index; |
30 | /* The grant references of the newly created grant, one per page */ |
31 | /* Variable size, depending on count */ |
32 | uint32_t gref_ids[1]; |
33 | }; |
34 | |
35 | #define GNTALLOC_FLAG_WRITABLE 1 |
36 | |
37 | /* |
38 | * Deallocates the grant reference, allowing the associated page to be freed if |
39 | * no other domains are using it. |
40 | */ |
41 | #define IOCTL_GNTALLOC_DEALLOC_GREF \ |
42 | _IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref)) |
43 | struct ioctl_gntalloc_dealloc_gref { |
44 | /* IN parameters */ |
45 | /* The offset returned in the map operation */ |
46 | uint64_t index; |
47 | /* Number of references to unmap */ |
48 | uint32_t count; |
49 | }; |
50 | |
51 | /* |
52 | * Sets up an unmap notification within the page, so that the other side can do |
53 | * cleanup if this side crashes. Required to implement cross-domain robust |
54 | * mutexes or close notification on communication channels. |
55 | * |
56 | * Each mapped page only supports one notification; multiple calls referring to |
57 | * the same page overwrite the previous notification. You must clear the |
58 | * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it |
59 | * to occur. |
60 | */ |
61 | #define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \ |
62 | _IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify)) |
63 | struct ioctl_gntalloc_unmap_notify { |
64 | /* IN parameters */ |
65 | /* Offset in the file descriptor for a byte within the page (same as |
66 | * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to |
67 | * be cleared. Otherwise, it can be any byte in the page whose |
68 | * notification we are adjusting. |
69 | */ |
70 | uint64_t index; |
71 | /* Action(s) to take on unmap */ |
72 | uint32_t action; |
73 | /* Event channel to notify */ |
74 | uint32_t event_channel_port; |
75 | }; |
76 | |
77 | /* Clear (set to zero) the byte specified by index */ |
78 | #define UNMAP_NOTIFY_CLEAR_BYTE 0x1 |
79 | /* Send an interrupt on the indicated event channel */ |
80 | #define UNMAP_NOTIFY_SEND_EVENT 0x2 |
81 | |
82 | #endif /* __LINUX_PUBLIC_GNTALLOC_H__ */ |
83 |
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