projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| dd314058 DDG |
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 | }; | |
| bdc612dc DDG |
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 | ||
| dd314058 | 82 | #endif /* __LINUX_PUBLIC_GNTALLOC_H__ */ |