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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-02-07 17:23:05 -0500 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-02-14 14:16:17 -0500 |
| commit | dd3140588d9551235ebc2a0dacdca098e7677573 (patch) | |
| tree | e9d7c229121b6bd00627b8e6f45235ea6b8ec790 /include/xen | |
| parent | aab8f11a6b4641fcb8c139420f2eae879b5d1698 (diff) | |
| download | kernel_samsung_tuna-dd3140588d9551235ebc2a0dacdca098e7677573.zip kernel_samsung_tuna-dd3140588d9551235ebc2a0dacdca098e7677573.tar.gz kernel_samsung_tuna-dd3140588d9551235ebc2a0dacdca098e7677573.tar.bz2 | |
xen-gntalloc: Userspace grant allocation driver
This allows a userspace application to allocate a shared page for
implementing inter-domain communication or device drivers. These
shared pages can be mapped using the gntdev device or by the kernel
in another domain.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/gntalloc.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/include/xen/gntalloc.h b/include/xen/gntalloc.h new file mode 100644 index 0000000..bc3b85e --- /dev/null +++ b/include/xen/gntalloc.h @@ -0,0 +1,50 @@ +/****************************************************************************** + * gntalloc.h + * + * Interface to /dev/xen/gntalloc. + * + * Author: Daniel De Graaf <dgdegra@tycho.nsa.gov> + * + * This file is in the public domain. + */ + +#ifndef __LINUX_PUBLIC_GNTALLOC_H__ +#define __LINUX_PUBLIC_GNTALLOC_H__ + +/* + * Allocates a new page and creates a new grant reference. + */ +#define IOCTL_GNTALLOC_ALLOC_GREF \ +_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref)) +struct ioctl_gntalloc_alloc_gref { + /* IN parameters */ + /* The ID of the domain to be given access to the grants. */ + uint16_t domid; + /* Flags for this mapping */ + uint16_t flags; + /* Number of pages to map */ + uint32_t count; + /* OUT parameters */ + /* The offset to be used on a subsequent call to mmap(). */ + uint64_t index; + /* The grant references of the newly created grant, one per page */ + /* Variable size, depending on count */ + uint32_t gref_ids[1]; +}; + +#define GNTALLOC_FLAG_WRITABLE 1 + +/* + * Deallocates the grant reference, allowing the associated page to be freed if + * no other domains are using it. + */ +#define IOCTL_GNTALLOC_DEALLOC_GREF \ +_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref)) +struct ioctl_gntalloc_dealloc_gref { + /* IN parameters */ + /* The offset returned in the map operation */ + uint64_t index; + /* Number of references to unmap */ + uint32_t count; +}; +#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */ |