1 files changed, 82 insertions, 0 deletions

diff --git a/include/uapi/xen/gntalloc.h b/include/uapi/xen/gntalloc.h
new file mode 100644
index 000000000000..76bd58065f4f
--- /dev/null
+++ b/include/uapi/xen/gntalloc.h
@@ -0,0 +1,82 @@
+/******************************************************************************
+ * 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;
+};
+
+/*
+ * Sets up an unmap notification within the page, so that the other side can do
+ * cleanup if this side crashes. Required to implement cross-domain robust
+ * mutexes or close notification on communication channels.
+ *
+ * Each mapped page only supports one notification; multiple calls referring to
+ * the same page overwrite the previous notification. You must clear the
+ * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
+ * to occur.
+ */
+#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \
+_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify))
+struct ioctl_gntalloc_unmap_notify {
+        /* IN parameters */
+        /* Offset in the file descriptor for a byte within the page (same as
+         * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
+         * be cleared. Otherwise, it can be any byte in the page whose
+         * notification we are adjusting.
+         */
+        uint64_t index;
+        /* Action(s) to take on unmap */
+        uint32_t action;
+        /* Event channel to notify */
+        uint32_t event_channel_port;
+};
+
+/* Clear (set to zero) the byte specified by index */
+#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
+/* Send an interrupt on the indicated event channel */
+#define UNMAP_NOTIFY_SEND_EVENT 0x2
+
+#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */